CN105207260A

CN105207260A - Angle-type three-phase alternating-current serial-connection type photovoltaic array

Info

Publication number: CN105207260A
Application number: CN201510603787.5A
Authority: CN
Inventors: 王哲; 许洪华
Original assignee: Beijing Corona Science and Technology Co Ltd
Current assignee: Beijing Corona Science and Technology Co Ltd
Priority date: 2015-09-21
Filing date: 2015-09-21
Publication date: 2015-12-30
Anticipated expiration: 2035-09-21
Also published as: CN105207260B

Abstract

An angle-type three-phase alternating-current serial-connection type photovoltaic array is composed of three single-phase alternating-current serial-connection type photovoltaic array bodies through angle-type connection. Each single-phase alternating-current serial-connection type photovoltaic array body is formed by connecting m serial-connection type photovoltaic array high-voltage isolating alternating-current power adjusting devices in series, wherein m is an integer larger than or equal to 1. The head end and the tail end of each single-phase alternating-current serial-connection type photovoltaic array body forming the angle-type connection three-phase alternating-current serial-connection type photovoltaic array are each correspondingly connected with a first energy storage battery pack, a second energy storage battery pack and a third energy storage battery pack. The output end of the angle-type connection three-phase alternating-current serial-connection type photovoltaic array is connected with the input end of a star-angle-type grid-connection balance controller. The output end of the star-angle-type grid-connection balance controller is connected with a grid-connection point power grid three-phase alternating-current power supply. Under the control of the star-angle-type grid-connection balance controller, the output of the angle-type connection three-phase alternating-current serial-connection type photovoltaic array is coordinated and balanced through the angle-type three-phase alternating-current serial-connection type photovoltaic array.

Description

Angle-style three-phase alternating current tandem photovoltaic square formation

Technical field

The present invention relates to a kind of solar photovoltaic generation system.

Background technology

The develop rapidly under the Policy Encouraging of country of current photovoltaic plant, photovoltaic arrays is one of important composition of photovoltaic generating system.The energy output of the direct influential system of square formation amount of capacity be made up of the connection in series-parallel of photovoltaic group string.Photovoltaic group string is composed in series by some pieces of photovoltaic modulies, and assembly is the minimum unit of group string.Maximum 22 pieces of tandem photovoltaic component count, it is withstand voltage that the quantity of series connection depends primarily on that assembly bears.Group crosstalk pressure≤1000V power after at present both at home and abroad assembly series connection is maximum≤7kWp.For improving generating merit amount, adopt two kinds of modes both at home and abroad at present: one is form square formation in parallel with the connection in series-parallel of a large amount of photovoltaic group to increase output current, improves square formation power stage in parallel, is exchanging output through inverter inversion, the method is also referred to as centralized or parallel structure, as shown in Figure 5.Two is group serial type photovoltaic generating systems as shown in Figure 6, adopt a kind of group serial type inverter, by in many groups group string direct input group serial type inverter, first the independent MPPT MPPT maximum power point tracking of each photovoltaic group string is realized, exchange at parallel inverter afterwards and export, this type power, small volume, easy for installation.To be confluxed cabinet parallel connection by interchange by multiple stage group serial type inverter again for increasing power further.Its essence of two types is all the parallel connection between group string, and voltage is low≤and 1000V, electric current is large, cable machinery loss is large, converging equipment is many, number of cables is many, and also inverter is current mode topological structure, power loss is large.Centralized or parallel then requirement group string performance parameter is close, the group independent maximum power point of string (MPPT) cannot be realized again and make power loss from motion tracking, and need the inverter room of relative scale to install and supporting related facility, construction cost and management cost are improved.Power station, distributed roof area is limit, presses must to consider during equal installation group string to accept or reject for meeting each group of crosstalk, cause limited area loss.Group string inverter due to grid-connected quantity many, adopt 28kW group string inverter for 10MW power station, then have 357 inverter parallels, very easily cause system to shake, special and site be in bulk power grid tail end light current net and away from load time, because concussion causes off-grid.Large-area off-grid causes the nearly loss of ten million to owner.

Have again, parallel-connection structure by photovoltaic group string limit, and every optical crosstalk volt group connection in series-parallel output voltage is improved according to grid-connected electric pressure, could meet the input starting resistor primary condition of inverter, as in 380v ac grid system, photovoltaic group string output dc voltage > could meet and start inverter basic operating conditions, starting resistor high to obtain electricity limited.

Parallel-connection structure input direct voltage < 1000v equally by photovoltaic group string limit, and can only meet inverter ac output voltage≤400v hierarchical system transless grid-connected, more voltage levels is grid-connected, must export through transformer boost.

Thus many groups group string is improved output voltage drop low transmission electric current in series connection and increase power, meet more high-grade transless grid-connected, make photovoltaic group string more low-voltage output energy be utilized, reduce cable and converging equipment quantity, reduce energy storage DC/AC conversion equipment volume and adopt nature cooling, install nearby, realize reducing circuit, traditional concentrated inverter is broken the whole up into parts, reduce cable, converging equipment, transformer and inverter control room cost, improve photovoltaic group string generating efficiency, adapt to distributed, large-sized photovoltaic power station and in future, the demand of high-voltage direct-current transmission of electricity.

The boosting of current photovoltaic system exports four kinds of modes substantially, one for photovoltaic group connection in series-parallel (square formation in parallel) through confluxing, inverter ac transformer boost exports, and mostly is centralized; Two is that the connection in series-parallel of photovoltaic group is confluxed again through transformer boost output through inverter ac, mostly is group string data; Three to export through the limited boosting of DC/DC through confluxing for volt group connection in series-parallel (square formation in parallel).Its essence still utilizes (parallel square formation) in parallel between a large amount of group string to improve photovoltaic arrays power output, and its shortcoming, except circuit, equipment loss are large, also needs step-up transformer to boost output when relatively high pressure exchanges and exports; Four is tandem direct current photovoltaic arrays, utilize photovoltaic group string spacer assembly that photovoltaic group string and photovoltaic group string are carried out high_voltage isolation, and export direct current power by photovoltaic group string spacer assembly, again some photovoltaic group string spacer assembly positive-negative output ends are composed in series tandem direct current photovoltaic arrays successively, tandem direct current photovoltaic arrays exports high voltage direct current and provides high-voltage inverter input direct voltage, is exchanging grid-connected output by high-voltage inverter conversion.Because tandem direct current photovoltaic arrays adopts direct current to export, then there is following deficiency:

1. rectifier output loss: when each photovoltaic group string spacer assembly AC/DC changes and exports, adopt high-voltage rectifier, due to the forward conduction voltage drop of rectification diode, cause power output to add loss on high-voltage rectifying diode.If rectification diode forward conduction voltage drop is 1V, flowing through electric current is 50A, then on a high-voltage rectifying diode, loss is 50W, as adopt full-bridge rectification then loss be 100W.If photovoltaic DC square formation capacity is 1MW, DC voltage level is ± 10kV, output current is 50A, and as needs photovoltaic group string spacer assembly 50, then the rectifier loss that tandem direct current photovoltaic arrays is total=100W*50 platform=5000W accounts for the 5KW/1000KW=0.5% of power output;

2., because tandem direct current photovoltaic arrays adopts direct current to export, as interchange exports grid-connected, need the conversion of high direct voltage input inverter to exchange output grid-connected.

Summary of the invention

The present invention seeks to overcome that existing parallel photovoltaic group string combining inverter floor space is large, inverter output voltage low current is large, cause that transmission line, corollary equipment loss are serious, high in cost of production shortcoming, propose a kind of angle-style three-phase alternating current tandem photovoltaic square formation.

Angle-style three-phase alternating current tandem photovoltaic square formation of the present invention is by three single phase alternating current (A.C.) tandem photovoltaic square formations, three groups of energy-storage battery groups, and the grid-connected balance controller composition of star-angle type.Three single phase alternating current (A.C.) tandem photovoltaic square formation angle-style connect, and composition angle-style three-phase alternating current tandem photovoltaic square formation, three tie point places of angle-style three-phase alternating current tandem photovoltaic square formation are corresponding to be respectively connected with three groups of energy-storage battery groups.Angle-style three-phase alternating current tandem photovoltaic square formation exports to input with the grid-connected balance controller of star-angle type and is connected, and the output of the grid-connected balance controller of star-angle type is connected with also site electrical network three-phase alternating-current supply.Under the grid-connected balance controller of star-angle type controls, coordinate angle-style three-phase alternating current tandem photovoltaic square formation Differential Output.

Described single phase alternating current (A.C.) tandem photovoltaic square formation is composed in series by m platform tandem photovoltaic square formation high_voltage isolation AC power adjusting device, and m is the integer of >=1.

In described single phase alternating current (A.C.) tandem photovoltaic square formation, the output tail end of the 1st tandem photovoltaic square formation high_voltage isolation AC power adjusting device is connected with the output head end of the 2nd tandem photovoltaic square formation high_voltage isolation AC power adjusting device, 2nd tandem photovoltaic square formation high_voltage isolation AC power adjusting device output tail end exports head end with the 3rd tandem photovoltaic square formation high_voltage isolation AC power adjusting device and is connected, the rest may be inferred, m-1 platform tandem photovoltaic square formation high_voltage isolation AC power adjusting device output tail end exports head end with m platform tandem photovoltaic square formation high_voltage isolation AC power adjusting device and is connected, composition single phase alternating current (A.C.) tandem photovoltaic square formation.The head end of the 1st tandem photovoltaic square formation high_voltage isolation AC power adjusting device output is the first output of single phase alternating current (A.C.) tandem photovoltaic square formation, and m platform tandem photovoltaic square formation high_voltage isolation AC power adjusting device exports the tail output that tail end is single phase alternating current (A.C.) tandem photovoltaic square formation.The input of every platform tandem photovoltaic square formation high_voltage isolation AC power adjusting device connects the output of photovoltaic group string.Wherein the head of single phase alternating current (A.C.) tandem photovoltaic square formation is connected with two groups of energy-storage battery groups with tail output is corresponding respectively.

In angle-style three-phase alternating current tandem photovoltaic square formation, the tail output of A cross streams tandem photovoltaic square formation is connected with the first output of B cross streams tandem photovoltaic square formation, and is connected with the first energy-storage battery group, and tie point is Uab; The tail output of B cross streams tandem photovoltaic square formation is connected with the first output of C cross streams tandem photovoltaic square formation, and is connected with the second energy-storage battery group, and tie point is Ubc; The tail output of C cross streams tandem photovoltaic square formation is connected with the first output of A cross streams tandem photovoltaic square formation, and is connected with the 3rd energy-storage battery group, and tie point is Uca; The first output of every cross streams tandem photovoltaic square formation is connected two energy-storage battery groups respectively with tail output end.The grid-connected balance controller input of star-angle type is connected with three tie points Uab, Ubc and Uca of angle-style three-phase alternating current tandem photovoltaic square formation, Uab, Ubc and Uca are also that the three-phase alternating current of angle-style three-phase alternating current tandem photovoltaic square formation exports, and output voltage values is respectively Vab, Vbc, Vca.

Consider that the generating of photovoltaic group string is vulnerable to the impact of cloud, output-power fluctuation is larger, the present invention utilizes the public connection between the three-phase alternating current tandem photovoltaic square formation of angle-style three-phase alternating current tandem photovoltaic square formation, the feature that current potential is equal, three groups of energy-storage battery groups are connected respectively three public junctions, by every cross streams tandem photovoltaic square formation to the charge and discharge control of energy-storage battery group, ensure that angle-style three-phase alternating current tandem photovoltaic square formation power output is relatively stable.

The grid-connected balance controller of star-angle type is made up of synchronization AC contactor, circuit breaker, current/voltage transducer and PLC.The output of described circuit breaker be also the grid-connected balance controller of star-angle type output with and site three phase mains be connected; The input of circuit breaker and current sensor series connection, and input in parallel with voltage sensor, synchronization AC contactor; Synchronization AC contactor input is also the input of the grid-connected balance controller of star-angle type and the output-parallel of angle-style three-phase alternating current tandem photovoltaic square formation.The output of angle-style three-phase alternating current tandem photovoltaic square formation is connected with also site electrical network three phase mains by synchronization AC contactor, current sensor, circuit breaker.

Described PLC comprises logic analysis control module, time-sequence control module, analogue enlargement module, multi-computer communication module, input control module and output control module.Multi-computer communication module communication port is corresponding to be respectively connected with the tandem photovoltaic square formation high_voltage isolation AC power adjusting device of the every phase of three-phase alternating current tandem photovoltaic square formation, be connected to the communicating circuit input/output port of controller module, the tandem photovoltaic square formation high_voltage isolation AC power adjusting device real-time, interactive data of multi-computer communication module and the every phase of angle-style three-phase alternating current tandem photovoltaic square formation, PLC according to control strategy computational analysis, and provides phase place, lock in time and power output data;

Time-sequence control module synchronism output port is corresponding to be respectively connected with the tandem photovoltaic square formation high_voltage isolation AC power adjusting device of the every phase of angle-style three-phase alternating current tandem photovoltaic square formation, is connected to the synchronous circuit input terminal of controller module.PLC by during the cause for gossip of time-sequence control module synchronous output end for angle-style three-phase alternating current tandem photovoltaic square formation every mutually in tandem photovoltaic square formation high_voltage isolation AC power adjusting device the pulse of synchronization zero-cross point is provided;

Input control module is connected with electric current, voltage sensor data output end, real-time monitoring line voltage, electric current and frequency change, and the data message that will detect also site three phase mains carries out analytical calculation through logic analysis control module, provide angle-style every cross streams tandem photovoltaic square formation phase place and data message by multi-computer communication module, exported the zero crossing synchronizing signal of angle-style every cross streams tandem photovoltaic square formation by time-sequence control module.

Output control module is connected with synchronization AC contactor control end, controls the break-make of synchronization AC contactor.

The tandem photovoltaic square formation high_voltage isolation AC power adjusting device of composition single phase alternating current (A.C.) tandem photovoltaic square formation is by n maximal power tracing module, energy storage DC/AC modular converter, controller module, power module and exchange isolation and amplifier module and form, and n is the integer of >=1.

The output of described photovoltaic group string is connected with the input of maximal power tracing module in tandem photovoltaic square formation high_voltage isolation AC power adjusting device, through this maximal power tracing module to photovoltaic group string MPPT maximal power tracing power output; The output of n maximal power tracing module is in parallel, and n maximal power tracing module output after parallel connection is in parallel with energy storage DC/AC modular converter, power module input respectively again; N maximal power tracing module provides energy storage DC/AC modular converter, power module power supply; Wherein the output of power module is connected with the power input of controller module, provides the working power of controller module; The sampling input of controller module and control output end respectively with n maximal power tracing module, and energy storage DC/AC modular converter connect; The output of energy storage DC/AC modular converter inputs with interchange isolation and amplifier module and is connected, and the output exchanging isolation and amplifier module exports with adjacent tandem photovoltaic square formation high_voltage isolation AC power adjusting device connects; Energy storage DC/AC modular converter is connected with energy-storage battery group.

Described maximal power tracing module is made up of energy storage inductor, storage capacitor, power switch, fly-wheel diode, current sensor and the busbar that confluxes.

The positive output end of each optical crosstalk volt group string is connected with the positive-negative input end of maximal power tracing module, the positive input terminal of maximal power tracing module is connected with one end of energy storage inductor, the other end of energy storage inductor is connected with the anode of power switch and fly-wheel diode positive pole respectively, and the negative pole of fly-wheel diode is connected with the positive input terminal of storage capacitor positive pole, current sensor respectively; The negative input end of current sensor is connected with the busbar anode that confluxes, the negative input end of photovoltaic group string is connected with negative terminal, the storage capacitor negative pole of power switch, the busbar negative terminal that confluxes respectively, and the positive and negative end of the busbar that confluxes also is the positive and negative output of maximal power tracing module; The control end of power switch connects every the corresponding output of circuit with controller light.

Described energy storage DC/AC modular converter is made up of energy storage control circuit, H bridge power driving circuit, the busbar voltage sensor that confluxes, phase monitor voltage sensor and protection relay.The input of H bridge power driving circuit respectively with energy storage control circuit, conflux busbar voltage sensor conflux in parallel on busbar; H bridge power driving circuit output respectively with protection relay make and break contact two ends, phase monitor voltage sensor, exchange the input winding parallel of isolation and amplifier module.

When angle-style three-phase energy complement AC series formula photovoltaic arrays normally works; when certain tandem photovoltaic square formation high_voltage isolation AC power adjusting device does not have power stage or breaks down; for ensureing that angle-style three-phase alternating current tandem photovoltaic square formation normally works; H bridge power driving circuit output is through the short circuit of protection relay normally closed contact; transformer is made to input internal resistance r=0 Ω; according to transformer principle, output impedance R=B ²r, wherein B is transformer voltage ratio, and r is transformer input impedance, thus output impedance R=0 Ω, can not affect angle-style three-phase alternating current tandem photovoltaic square formation and normally work.

Described H electrical bridge rate drive circuit is made up of phase monitor voltage sensor, 4 power switch pipes and 4 fly-wheel diodes, and every power switch pipe has a control input end, a power input and a power take-off.The input of every power switch pipe and output reverse parallel connection fly-wheel diode; Every 2 power switch pipes series connection, forms 2 groups of H bridge arm circuit.Often organize in H bridge arm circuit, the input of a power switch tube power is connected with the output of another power switch pipe, and tie point is the power take-off of H bridge arm circuit; The two ends of 2 groups of H bridge arm circuit are respectively positive input terminal and the negative input end of H bridge arm circuit; 2 groups of H bridge arm circuit compose in parallel H bridge power driving circuit, the anode of the H bridge arm circuit after parallel connection and negative terminal are also anode and the negative terminal of H bridge power driving circuit, the power take-off of 2 groups of H bridge arm circuit is also 2 power take-offs of H bridge rate drive circuit, and the control input end of 4 power switch pipes is also 4 control input ends of H bridge power driving circuit.

Described energy storage control circuit is made up of a power switch pipe and charging and discharging currents detecting sensor.One end of power switch pipe is connected with the input anode of H bridge power driving circuit and the busbar positive pole that confluxes by the charging and discharging currents detecting sensor of series connection, the other end of power switch pipe is the energy-storage battery group discharge and recharge incoming end of energy storage control circuit, and is connected with one group of energy-storage battery group positive pole; Energy-storage battery group negative pole is connected with the busbar negative pole that confluxes; Power switch pipe control end is also the control end of energy storage control circuit, and is connected every drive circuit with controller module light.

Described controller module is made up of every circuit, synchronous circuit and two-way communication circuit CPU, A/D sample circuit, light.The output that the input difference correspondence of described A/D sample circuit detects current sensor with the current sensor of each maximal power tracing module, energy storage DC/AC modular converter charging and discharging currents is connected, also be connected with the busbar that confluxes of energy storage DC/AC modular converter, the phase monitor voltage sensor of H bridge power driving circuit respectively, wherein A/D sample circuit also has an input port to be energy-storage battery group voltage sensor senses end simultaneously.Described light is connected with the I/O port of CPU in controller module every the input of circuit, and light is connected with the control input end of the control switch pipe of the power switch control input end of each maximal power tracing module, 4 control input ends of H bridge power driving circuit and protection relay circuit and accumulator control end respectively every the output of circuit; One end of two-way communication circuit is connected with the PORT COM of CPU in controller module, the other end of two-way communication circuit is also the PORT COM of tandem photovoltaic square formation high_voltage isolation AC power adjusting device, by optical fiber or to be wirelessly connected with the multi computer communication module port in the grid-connected balance controller PLC of star-angle type, real-time exchange data; One end of synchronous circuit is connected with the I/O port of CPU in controller module, the other end of synchronous circuit is also the synchronous input end mouth of tandem photovoltaic square formation high_voltage isolation AC power adjusting device, by optical fiber or to be wirelessly connected with the time-sequence control module output in the grid-connected balance controller PLC of star-angle type, the tandem photovoltaic square formation high_voltage isolation AC power adjusting device realized in every cross streams tandem photovoltaic square formation exports synchronous with this phase electrical network zero crossing.When the grid-connected balance controller of star-angle type judges to allow m tandem photovoltaic square formation high_voltage isolation AC power adjusting device access electrical network, the grid-connected balance controller of star-angle type controls the work of synchronization AC contactor, electrical network passes through circuit breaker, current/voltage transducer and synchronization AC contactor contact are connected with angle-style three-phase alternating current tandem photovoltaic square formation, in angle-style three-phase alternating current tandem photovoltaic square formation, m tandem photovoltaic square formation high_voltage isolation AC power adjusting device output of each single phase alternating current (A.C.) tandem photovoltaic square formation is by line voltage dividing potential drop, and by exchanging isolation and amplifier module high voltage isolating transformer oppositely by the phase place of angle-style three-phase alternating current tandem photovoltaic square formation every cross streams tandem photovoltaic square formation of correspondence, frequency, voltage couples is to the input winding terminal exchanging isolation and amplifier module, the controller module of tandem photovoltaic square formation high_voltage isolation AC power adjusting device reads phase place by phase monitor voltage sensor, the zero crossing synchronizing signal that frequency and information of voltage and the grid-connected balance controller of star-angle type provide, and this information data is passed back in star-angle type grid-connected balance controller multi computer communication module port by two-way communication circuit PORT COM.The grid-connected balance controller of star-angle type is according to the phase place of this three-phase alternating current tandem photovoltaic square formation, frequency, voltage data and synchronizing information, respectively by the port of multi computer communication module and the port of time-sequence control module corresponding send control data and synchronization pulse to tandem photovoltaic square formation high_voltage isolation AC power adjusting device, the controller module of tandem photovoltaic square formation high_voltage isolation AC power adjusting device, according to these data and synchronization pulse, controls H electrical bridge power driving circuit and exchanges output through exchanging isolation and amplifier module.

Described power module is made up of DC/DC power supply, lightning arrester and protection relay circuit.The input of DC/DC power supply is in parallel with the two ends of lightning arrester, and thunderbolt avoided by protection tandem photovoltaic square formation high_voltage isolation AC power adjusting device electrical equipment.The output of DC/DC power supply is in parallel with the input of protection relay circuit; Described protection relay electricity routing relay and control switch pipe composition; The power input of control switch pipe is also the negative input end of protection relay circuit; the power take-off of control switch pipe is connected with relay one end; the other end of relay is the positive input terminal of protection relay circuit, and the control input end of control switch pipe is also the control input end of protection relay circuit.

When DC/DC power supply is not activated, protection relay circuit two ends do not have voltage, and protection relay normally closed contact closes, tandem photovoltaic square formation high_voltage isolation AC power adjusting device output impedance R=0 Ω.When DC/DC power initiation output dc voltage, under the control of the controller, the opening and closing of foundation demand modeling normally closed contact, to tandem photovoltaic square formation high_voltage isolation AC power adjusting device output impedance R=0 Ω or R=B for protection relay ²r Ω controls, and r is the power input internal resistance exchanging isolation and amplifier module.

Described interchange isolation and amplifier module is made up of high voltage isolating transformer, two isolating switches and a short switch.Described high voltage isolating transformer has a power input winding and a power stage winding, and wherein the power input winding of high voltage isolating transformer is also the input exchanging isolation and amplifier module; The two ends of power stage winding are connected with the input of two isolating switches respectively, the output of two isolating switches is connected with short switch two ends respectively, short switch two ends are the outputs exchanging isolation and amplifier module, also be tandem photovoltaic square formation high_voltage isolation AC power adjusting device output, output voltage is Uac.And high voltage isolating transformer isolation voltage > Uacsmax.Due to adding of high voltage isolating transformer, make the isolation voltage > Uacsmax of tandem photovoltaic square formation high_voltage isolation AC power adjusting device.Described Uacsmax is also referred to as the highest alternating voltage of system.Angle-style three-phase energy complement AC series formula photovoltaic arrays exports maximum A phase voltage respectively: Uasmax=Ua1max+Ua2max+Ua3max ... ,+Uammax; B phase voltage: Ubsmax=Ub1max+Ub2max+Ub3max ... ,+Ubmmax; C phase voltage: Ucsmax=Uc1max+Uc2max+Uc3max ... ,+Ucmmax; Uammax, Ubmmax, Ucmmax is that m tandem photovoltaic square formation high_voltage isolation AC power adjusting device exports maximum voltage value.M is the integer of >=1.

The two ends of described high voltage isolating transformer power input winding are connected with H bridge power driving circuit power take-off in energy storage DC/AC modular converter, and the power output of n maximal power tracing module is inputted winding coupled to power stage winding output AC power through power by energy storage DC/AC modular converter.

H bridge power driving circuit correspondence in tandem photovoltaic square formation high_voltage isolation AC power adjusting device exports phase place, frequency, the power of angle-style three-phase alternating current tandem photovoltaic square formation, through exchanging the high voltage isolating transformer coupling output of isolation and amplifier module, and through two isolating switches, short switch output AC power.Open-circuit condition is in when short switch is normal, safeguard when a certain tandem photovoltaic square formation high_voltage isolation AC power adjusting device or change, when exiting angle-style three-phase alternating current tandem photovoltaic square formation, normally work for not affecting angle-style three-phase alternating current tandem photovoltaic square formation, short switch is closed.When three groups of described energy-storage battery groups are connected with angle-style three-phase alternating current tandem photovoltaic square formation respectively, m tandem photovoltaic square formation high_voltage isolation AC power adjusting device output tail end wherein in a cross streams tandem photovoltaic square formation exports head end respectively with the 1st tandem photovoltaic square formation high_voltage isolation AC power adjusting device in another cross streams tandem photovoltaic square formation with the busbar negative pole that confluxes and the busbar negative pole that confluxes is connected, make current potential residing for the 1st in adjacent two-phase AC series formula photovoltaic arrays and m tandem photovoltaic square formation high_voltage isolation AC power adjusting device equal.Thus can be in parallel by the energy-storage battery group discharge and recharge incoming end in adjacent two-phase the 1st and m tandem photovoltaic square formation high_voltage isolation AC power adjusting device, and be connected with one group of energy-storage battery group anode.Energy storage DC/AC modular converter in adjacent two-phase the 1st and m the tandem photovoltaic square formation high_voltage isolation AC power adjusting device busbar negative terminal that confluxes is in parallel, and is connected with energy-storage battery group negative terminal.

Energy-storage battery group discharge and recharge incoming end wherein in A cross streams tandem photovoltaic square formation the 1st tandem photovoltaic square formation high_voltage isolation AC power adjusting device and the busbar negative terminal that confluxes are connected with the 3rd energy-storage battery group is positive and negative, and the energy-storage battery group discharge and recharge incoming end in m tandem photovoltaic square formation high_voltage isolation AC power adjusting device and the busbar negative terminal that confluxes are connected with the first energy-storage battery group is positive and negative; Energy-storage battery group discharge and recharge incoming end wherein in B cross streams tandem photovoltaic square formation the 1st tandem photovoltaic square formation high_voltage isolation AC power adjusting device and the busbar negative terminal that confluxes are connected with the first energy-storage battery group is positive and negative, and the energy-storage battery group discharge and recharge incoming end in m tandem photovoltaic square formation high_voltage isolation AC power adjusting device and the busbar negative terminal that confluxes are connected with the second energy-storage battery group is positive and negative; Energy-storage battery group discharge and recharge incoming end wherein in C cross streams tandem photovoltaic square formation the 1st tandem photovoltaic square formation high_voltage isolation AC power adjusting device and the busbar negative terminal that confluxes are connected with the second energy-storage battery group is positive and negative, and the energy-storage battery group discharge and recharge incoming end in m tandem photovoltaic square formation high_voltage isolation AC power adjusting device and the busbar negative terminal that confluxes are connected with the 3rd energy-storage battery group is positive and negative.

The energy-storage battery group voltage sensor senses end of the A/D sample circuit in the controller of adjacent two-phase the 1st and m tandem photovoltaic square formation high_voltage isolation AC power adjusting device puts parallel connection, and exports with energy-storage battery group voltage sensor data and be connected.

Operation principle of the present invention and the course of work as follows:

Voltage <1000v is born because photovoltaic group string is the highest, as photovoltaic module voltage breakdown caused to damage series connection between photovoltaic group string, between each photovoltaic group string, increase a high_voltage isolation link for this reason, improve the isolation voltage ability of photovoltaic group string.Each photovoltaic group was ganged up after tandem photovoltaic square formation high_voltage isolation AC power adjusting device carries out high-voltage electrical apparatus isolation and was exported by the present invention, make the proof voltage > AC system voltage U acsmax of each tandem photovoltaic square formation high_voltage isolation AC power adjusting device, realize the series connection of m tandem photovoltaic square formation high_voltage isolation AC power adjusting device thus.

Because the isolation voltage of tandem photovoltaic square formation high_voltage isolation AC power adjusting device improves, the output voltage of m tandem photovoltaic square formation high_voltage isolation AC power adjusting device series connection is respectively phase voltage Uabs, Ubcs, Ucas of the output of angle-style three-phase alternating current tandem photovoltaic square formation.Uabs, Ubcs, Ucas are formula photovoltaic arrays high_voltage isolation AC power adjusting device output voltage sum: the Uabs=Ua1+Ua2+Ua3+ that is often in series ... Uam; Ubcs=Ub1+Ub2+Ub3+ ... Ubm; Ucas=Uc1+Uc2+Uc3+ ... Ucm.

Due to the photovoltaic module parameter error in each tandem photovoltaic square formation high_voltage isolation AC power adjusting device, or a certain moment irradiation is different, or the light group string quantity of composition is different, make the output voltage Uam of each tandem photovoltaic square formation high_voltage isolation AC power adjusting device, Ubm, Ucm is likely different, for ensureing that angle-style three-phase alternating current tandem photovoltaic square formation exports balance, i.e. Uabs=Ubcs=Ucas=Uacs and Pa=Pb=Pc, in star-angle type grid-connected balance controller diagonal form three-phase alternating current tandem photovoltaic square formation, each tandem photovoltaic square formation high_voltage isolation AC power adjusting device output coordinating controls, make Uabs=Ua1+Ua2+Ua3+ ... Uam, Ubcs=Ub1+Ub2+Ub3+ ... Ubm, Ucas=Uc1+Uc2+Uc3+ ... Ucm also ensures Ias=Ibs=Ics, wherein Uacs is and site alternating voltage, Ias, Ibs, Ics is respectively angle-style three-phase alternating current tandem photovoltaic square formation output current, Pa, Pb, Pc is respectively angle-style three-phase alternating current tandem photovoltaic square formation every cross streams tandem photovoltaic square formation power output.

In angle-style three-phase alternating current tandem photovoltaic square formation, the tandem photovoltaic square formation high_voltage isolation AC power adjusting device course of work is in different situations as follows:

There is no irradiance or very low time, tandem photovoltaic square formation high_voltage isolation AC power adjusting device does not have power supply to supply, and now because protection relay make and break contact closes, transformer input internal resistance r=0 Ω, according to transformer principle output impedance R=B ²r, wherein B is transformer voltage ratio, and r is the power input internal resistance exchanging isolation and amplifier module, and output impedance R=0 Ω, does not have power stage thus.

When irradiance increases gradually, in every cross streams tandem photovoltaic square formation, tandem photovoltaic square formation high_voltage isolation AC power adjusting device input power synchronously increases, for the maximal power tracing module in tandem photovoltaic square formation high_voltage isolation AC power adjusting device, energy storage DC/AC modular converter, power module provide power supply.When input voltage meets DC/DC starting resistor in power module, DC/DC output dc voltage makes controller work.Controller module initialization, Control protection relay circuit breaker in middle pipe conducting respectively, make protection relay work, protection relay normally closed contact disconnects, tandem photovoltaic square formation high_voltage isolation AC power adjusting device output impedance R=B ²r Ω, r are the power input internal resistance exchanging isolation and amplifier module.

In angle-style three-phase alternating current tandem photovoltaic square formation, when the 1st and m tandem photovoltaic square formation high_voltage isolation AC power adjusting device input voltage in every cross streams tandem photovoltaic square formation meet DC/DC starting resistor in power module, its controller module puts the voltage sensor data detecting corresponding energy-storage battery group in real time by the energy-storage battery group voltage sensor senses end of A/D sample circuit, and whether analytical voltage value is less than energy storage DC/AC modular converter confluxes busbar voltage sensor magnitude of voltage, when the voltage of energy-storage battery group be less than conflux busbar voltage sensor time, controller module controls energy storage control circuit and charges to energy-storage battery group, the current value of the DC/AC of controller module Real-Time Monitoring energy storage simultaneously modular converter charging and discharging currents detecting sensor, when this current value is zero, controller module controls energy storage control circuit and stops charging to energy-storage battery group.

Simultaneously, the controller module of tandem photovoltaic square formation high_voltage isolation AC power adjusting device sets up synchronous and communication contact respectively by synchronous circuit and two-way communication circuit with the grid-connected balance controller of star-angle type, and tandem photovoltaic square formation high_voltage isolation AC power adjusting device enters acquiescence operating state.

Default mode of operation: the grid-connected balance controller of star-angle type sets up synchronous and communication with tandem photovoltaic square formation high_voltage isolation AC power adjusting device in every cross streams tandem photovoltaic square formation, and send synchronizing signal and interaction data in real time, confirm the quantity of the tandem photovoltaic square formation high_voltage isolation AC power adjusting device worked in every cross streams tandem photovoltaic square formation simultaneously.When the quantity that the grid-connected balance controller of star-angle type monitors the photovoltaic arrays high_voltage isolation AC power adjusting device of the work that enters meets every cross streams tandem photovoltaic square formation minimum number Mmin=Uacs/Ummax, PLC in the grid-connected balance controller of star-angle type controls the adhesive of synchronization AC contactor, make three-phase alternating current tandem photovoltaic square formation grid-connected, wherein Ummax is tandem photovoltaic square formation high_voltage isolation AC power adjusting device maximum output voltage; Mmin is tandem photovoltaic square formation high_voltage isolation AC power adjusting device minimum number.Because tandem photovoltaic square formation high_voltage isolation AC power adjusting device in now every cross streams tandem photovoltaic square formation does not have power stage, output impedance is R=B ²r Ω, then in every cross streams tandem photovoltaic square formation, the output impedance of tandem photovoltaic square formation high_voltage isolation AC power adjusting device is R1=R2=R3=... Rm, wherein R1, R2, R3 ... Rm is respectively the output impedance of m tandem photovoltaic square formation high_voltage isolation AC power adjusting device in a cross streams tandem photovoltaic square formation.Due to m tandem photovoltaic square formation high_voltage isolation AC power adjusting device series connection, when grid-connected point voltage is loaded into angle-style three-phase alternating current tandem photovoltaic square formation, the electric current flowing through the tandem photovoltaic square formation high_voltage isolation AC power adjusting device in every cross streams tandem photovoltaic square formation is equal, each tandem photovoltaic square formation high_voltage isolation AC power adjusting device output dividing potential drop is then had to be Ua1=Ua2=Ua3=... Uam, Uam=Uas/m, Ub1=Ub2=Ub3=... Ubm, Ubm=Ubs/m, Uc1=Uc2=Uc3=... Ucm, Ucm=Ucs/m, this branch pressure voltage is through exchanging isolation and amplifier module high voltage isolating transformer oppositely by the phase place of corresponding angle-style three-phase alternating current tandem photovoltaic square formation, frequency, voltage couples is to the input exchanging isolation and amplifier module, controller module reads the phase place of this angle-style three-phase alternating current tandem photovoltaic square formation by phase monitor voltage sensor, frequency and information of voltage, and information is uploaded to the grid-connected balance controller of star-angle type.

Now, the grid-connected balance controller of star-angle type is according to the phase place of this angle-style three-phase alternating current tandem photovoltaic square formation, frequency, voltage data and synchronizing information, tandem photovoltaic square formation high_voltage isolation AC power adjusting device to correspondence sends control data and synchronization pulse, the controller module of tandem photovoltaic square formation high_voltage isolation AC power adjusting device is according to these data and synchronization pulse, control H bridge power driving circuit exchanges output through exchanging isolation and amplifier module, enters mode of operation.

Mode of operation:

When the controller module of tandem photovoltaic square formation high_voltage isolation AC power adjusting device is according to the phase place of this angle-style three-phase alternating current tandem photovoltaic square formation, frequency, voltage data and synchronization pulse, during output AC voltage, CPU in controller module gathers the electric current of each maximal power tracing module and the busbar voltage that confluxes respectively by A/D sample circuit, and according to MPPT maximal power tracing strategy, by controlling light every circuit output pulse signal, control the opening and closing of the power switch of maximal power tracing module, realize MPPT maximal power tracing.

Wherein maximal power tracing module forms BOOST circuit by energy storage inductor, fly-wheel diode, storage capacitor, power switch, the CPU of controller module is according to BOOST circuit working principle, by controlling the duty ratio of power switch conducting or closedown, change the energy that energy storage inductor exports, export through fly-wheel diode, to storage capacitor charge or discharge, change output current and the voltage of photovoltaic group string, realize photovoltaic group string maximal power tracing, and through current sensor monitoring power output.Now CPU detects the change of maximal power tracing circuit output current and the busbar voltage that confluxes by current sensor, and analyzes according to this electric current and voltage data, provides the MPPT maximal power tracing control impuls of future time.

Controller now in each tandem photovoltaic square formation high_voltage isolation AC power adjusting device detects n maximal power tracing module respectively by A/D sample circuit, electric current, the voltage of conflux busbar and energy storage DC/AC modular converter, and the controller in the 1st in every cross streams tandem photovoltaic square formation that same angle-style connects and m tandem photovoltaic square formation high_voltage isolation AC power adjusting device detects electric current, the voltage of energy-storage battery group or super capacitor respectively by A/D sample circuit.

And by two-way communication circuit through optical fiber or wirelessly upload the data in the grid-connected balance controller of star-angle type, the grid-connected balance controller of star-angle type carries out three-phase equilibrium, phase place, Synchronization Control analytical calculation and power optimization strategy analytical calculation, to the photovoltaic arrays high_voltage isolation AC power adjusting device passback control data in the angle-style three-phase alternating current tandem photovoltaic square formation of correspondence according to also site phase place, frequency, the information of voltage of these data and the grid-connected balance controller monitoring of star-angle type.Controller in each photovoltaic arrays high_voltage isolation AC power adjusting device is according to receiving data, CPU by light every circuit output pwm signal, control H bridge power driving circuit 4 control signal inputs, the power output of the H bridge power driving circuit high voltage isolating transformer input winding coupled through exchanging isolation and amplifier module exports winding to high voltage isolating transformer, then two isolating switches in interchange isolation and amplifier module, short switch export the phase place of corresponding angle-style three-phase alternating current tandem photovoltaic square formation, frequency, voltage and electric current.Open-circuit condition is in when short switch is normal, when a certain tandem photovoltaic square formation high_voltage isolation AC power adjusting device is safeguarded or angle-style three-phase alternating current tandem photovoltaic square formation is exited in replacing, normally work, by short switch quick-make for not affecting angle-style three-phase alternating current tandem photovoltaic square formation.

Specific as follows to the control strategy of angle-style three-phase alternating current tandem photovoltaic square formation of the present invention:

If angle-style three-phase alternating current tandem photovoltaic square formation three phase power is respectively PA, PB, PC, in tandem photovoltaic square formation high_voltage isolation AC power adjusting device in angle-style three-phase alternating current tandem photovoltaic square formation power output is respectively Pa1 ~ Pam, Pb1 ~ Pbm, Pc1 ~ Pcm, m are the integer of >=1.Then PA=Pa1+Pa2 ... Pam; PB=Pb1+Pb2 ... Pbm; PC=Pc1+Pc2 ... Pcm.Then there is angle-style three-phase alternating current tandem photovoltaic square formation gross power Pacs=PA+PB+PC; Three-phase current is respectively Ias=PA/Vacs, Ibs=PB/Vacs, Ics=PC/Vacs, and wherein Vacs is grid-connected point voltage.

1, synchronization policy:

1) Strategy For Synchronization Control is started: when the tandem photovoltaic square formation high_voltage isolation AC power adjusting device minimum number Mmin=Uacs/Ummax that the grid-connected balance controller of star-angle type monitors in every cross streams tandem photovoltaic square formation meets condition of work, PLC in the grid-connected balance controller of star-angle type controls the adhesive of synchronization AC contactor, makes three-phase alternating current tandem photovoltaic square formation grid-connected.Now in every phase three-phase alternating current tandem photovoltaic square formation, tandem photovoltaic square formation high_voltage isolation AC power adjusting device does not have power stage, and output impedance is R=B ²r Ω.When grid-connected point voltage is loaded into angle-style three-phase alternating current tandem photovoltaic square formation, each tandem photovoltaic square formation high_voltage isolation AC power adjusting device output dividing potential drop is then had to be Ua1=Ua2=Ua3=... Uam, Ub1=Ub2=Ub3=... Ubm, Uc1=Uc2=Uc3=... Ucm, this branch pressure voltage is through exchanging isolation and amplifier module high voltage isolating transformer oppositely by the phase place of corresponding angle-style three-phase alternating current tandem photovoltaic square formation, frequency, voltage couples is to the input exchanging isolation and amplifier module, controller module reads the phase place of this angle-style three-phase alternating current tandem photovoltaic square formation by phase monitor voltage sensor, frequency and information of voltage, and information is uploaded to the grid-connected balance controller of star-angle type.

Now, the grid-connected balance controller of star-angle type is according to the phase place of this angle-style three-phase alternating current tandem photovoltaic square formation, frequency, voltage data and synchronizing information, tandem photovoltaic square formation high_voltage isolation AC power adjusting device to correspondence sends control data and synchronization pulse, the controller module of tandem photovoltaic square formation high_voltage isolation AC power adjusting device is according to these data and synchronization pulse, and control H bridge power driving circuit exchanges output through exchanging isolation and amplifier module.

2) real-time synchronization control strategy: when angle-style three-phase alternating current tandem photovoltaic square formation normally works, input module in star-angle type grid-connected balance controller PLC is by the current sensor in the grid-connected balance controller of star-angle type, voltage sensor detects and the phase place of site three-phase alternating-current supply respectively, frequency, when electric current and voltage data, respectively according to the tandem photovoltaic square formation high_voltage isolation AC power adjusting device return data in every cross streams tandem photovoltaic square formation, various working strategies and calculate the zero crossing time, respectively by PLC by multi-computer communication module, time-sequence control module is corresponding sends control data and synchronization pulse to the tandem photovoltaic square formation high_voltage isolation AC power adjusting device in every cross streams tandem photovoltaic square formation.The controller module of tandem photovoltaic square formation high_voltage isolation AC power adjusting device is according to these data and synchronization pulse, and control H bridge power driving circuit exchanges output through exchanging isolation and amplifier module.

2, three-phase equilibrium control strategy:

Pattern 1), due to the impact of cloud, there is fluctuation in part output power of photovoltaic module, the tandem photovoltaic square formation high_voltage isolation AC power adjusting device input power that part photovoltaic module is corresponding therewith raises or declines, and causes angle-style three-phase alternating current tandem photovoltaic square formation disequilibrium.Due in tandem photovoltaic square formation high_voltage isolation AC power adjusting device, controller module detects electric current, the voltage of the energy-storage battery group in the 1st of every cross streams tandem photovoltaic square formation and m tandem photovoltaic square formation high_voltage isolation AC power adjusting device that the busbar voltage that confluxes, each maximal power tracing blocks current and angle-style connect in real time in real time by A/D sample circuit, and by two-way communication circuit to the grid-connected balance controller interaction data of star-angle type.The data analysis of each tandem photovoltaic square formation high_voltage isolation AC power adjusting device obtained calculates by the grid-connected balance controller of star-angle type, for ensureing that angle-style three-phase alternating current tandem photovoltaic square formation exports balance, adjust the tandem photovoltaic square formation high_voltage isolation AC power adjusting device power output size in every cross streams tandem photovoltaic square formation, first the tandem photovoltaic square formation high_voltage isolation AC power adjusting device maximum power output except the 1st in every cross streams tandem photovoltaic square formation and m is guaranteed, and one or two-phase alternating current tandem photovoltaic square formation that in three-phase alternating current tandem photovoltaic square formation, power output is on the low side, the power of its deficiency is supplemented by the 1st of this phase and the energy-storage battery group of m tandem photovoltaic square formation high_voltage isolation AC power adjusting device power output and correspondence, the surplus power that in other phase, the 1st and m tandem photovoltaic square formation high_voltage isolation AC power adjusting device do not export, is saved in corresponding energy-storage battery group by the 1st of correspondence and m tandem photovoltaic square formation high_voltage isolation AC power adjusting device.Three groups of energy-storage battery pool-sizes due to angle-style three-phase alternating current tandem photovoltaic square formation are respectively three groups of adjacent two-phase AC series formula photovoltaic arrays and share energy-storage battery pool-size, then angle-style three-phase alternating current tandem photovoltaic square formation Differential Output, carries out charge and discharge control by the 1st of every cross streams tandem photovoltaic square formation and m tandem photovoltaic square formation high_voltage isolation AC power adjusting device to corresponding energy-storage battery group by the grid-connected balance controller of star-angle type.As second tandem photovoltaic square formation high_voltage isolation AC power adjusting device power output Pa2 in angle-style three-phase alternating current tandem photovoltaic square formation PA phase declines, then PA<PB=PC, PB-PA=Δ PA, the grid-connected balance controller of star-angle type is according to depositing front energy-storage battery pool-size data and power optimization principle, and when ensureing PA+ Δ PA=PB=PC, AC series photovoltaic arrays maximum current Iacs=(PA+ Δ PA)/Vacs is obtained by every cross streams tandem photovoltaic square formation maximum power output and system voltage, and utilize this electric current I acs to calculate the output voltage of each tandem photovoltaic square formation high_voltage isolation AC power adjusting device in the photovoltaic arrays that is often in series, 1st and m tandem photovoltaic square formation high_voltage isolation AC power adjusting device output Δ PA power stage of control A cross streams tandem photovoltaic square formation.Wherein Δ PA is A cross streams tandem photovoltaic square formation and the difference of B phase or C phase.

As angle-style three-phase alternating current tandem photovoltaic square formation Δ PA=Pa1+Pam, and first in A cross streams tandem photovoltaic square formation and m tandem photovoltaic square formation high_voltage isolation AC power adjusting device power output Pa1, Pam are distributed according to the front capacity data of corresponding energy-storage battery group by the grid-connected balance controller of star-angle type.During the two groups of energy-storage battery pool-size PE_AB=PE_CA be connected with m tandem photovoltaic square formation high_voltage isolation AC power adjusting device correspondence when the 1st of A cross streams tandem photovoltaic square formation, then Δ PA/2=Pa1=Pam; As two groups of energy-storage battery pool-size PE_AB < PE_AC of correspondence, then PE_AB/PE_AC=η a, Pa1=Δ PA* η a, otherwise Pam=Δ PA-Pa1, PE_AB > PE_AC, then PE_AC/PE_AB=η a, Pam=Δ PA* η a, Pa1=Δ PA-Pam then A phase: Va1=Pa1/Iacs, Va2=Pa2/Iacs ... Vam=Pam/Iacs; B phase: Vb1=Pb1/Iacs, Vb2=Pb2/Iacs ..., Vbm=Pbm/Iacs; C phase: Vc1=Pc1/Iacs, Vc2=Pc2/Iacs ..., Vcm=Pcm/Iacs;

Wherein PE_AB, PE_CA, PE_BC are respectively in angle-style three-phase alternating current tandem photovoltaic square formation, the capacity of the first energy-storage battery group, the second energy-storage battery group, the 3rd energy-storage battery group, η a is the ratio of the capacity PE_AB of the first energy-storage battery group and the capacity PE_CA of the 3rd energy-storage battery group be connected with A cross streams tandem photovoltaic square formation.

When the grid-connected balance controller of star-angle type detects that energy-storage battery pool-size can not support that angle-style three-phase alternating current tandem photovoltaic square formation exports balance, second tandem photovoltaic square formation high_voltage isolation AC power adjusting device power output Pa2 in angle-style three-phase alternating current tandem photovoltaic square formation PA phase declines, then PA<PB=PC, the grid-connected balance controller of star-angle type is according to power optimization principle, obtain A to be in series photovoltaic arrays maximum output current Iacs=PA/Vacs, and utilize the A photovoltaic arrays maximum output current Iacs that is in series to calculate A and to be in series the output voltage Va1=Pa1/Iacs of each tandem photovoltaic square formation high_voltage isolation AC power adjusting device in photovoltaic arrays, Va2=Pa2/Iacs ... Vam=Pam/Iacs, for ensureing that three-phase alternating current exports balance, the generated output of a cross streams tandem photovoltaic square formation that then in calculating angle-style three-phase alternating current tandem photovoltaic square formation, generated output is minimum and the proportionality coefficient of the generated output of another two-phase AC series formula photovoltaic arrays, then there is B phase, C is in series photovoltaic arrays PA/PB=xb, PA/PC=xc, calculate proportionality coefficient xb, xc thus, utilize this proportionality coefficient to calculate PB*xb=Pb1*xb+Pb2*xb respectively ... Pbm*xb, PC*xc=Pc1*xc+Pc2*xc ... Pcm*xc, then calculate B phase respectively, output voltage values that C is in series each tandem photovoltaic square formation high_voltage isolation AC power adjusting device in photovoltaic arrays, B phase: Vb1=Pb1*xb/Iacs, Vb2=Pb2*xb/Iacs ..., Vbm=Pbm*xb/Iacs, C phase: Vc1=Pc1*xc/Iacs, Vc2=Pc2*xc/Iacs ..., Vcm=Pcm*xc/Iacs, B phase, C are in series power output Pbm*xb<Pbm, the Pm*xc<Pcm of each tandem photovoltaic square formation high_voltage isolation AC power adjusting device in photovoltaic arrays thus, then there are Δ Pbm=Pbm-Pbm*xb, Δ Pcm=Pcm-Pcm*xc.

After each tandem photovoltaic square formation high_voltage isolation AC power adjusting device thus in the complementary tandem photovoltaic square formation of angle-style three-phase alternating current performs the data of the grid-connected balance controller transmission of star-angle type, the output voltage values Vam of each tandem photovoltaic square formation high_voltage isolation AC power adjusting device of every phase will be pressed respectively, Vbm, Vcm output voltage, and the B residue power output Δ Pbm be in series in photovoltaic arrays is stored into the 1st the first energy-storage battery group and the second energy-storage battery group be connected with m tandem photovoltaic square formation high_voltage isolation AC power adjusting device correspondence of B cross streams tandem photovoltaic square formation respectively, the C residue power output Δ Pcm be in series in photovoltaic arrays is stored in the 1st the second energy-storage battery group and the 3rd energy-storage battery group be connected with correspondence in m tandem photovoltaic square formation high_voltage isolation AC power adjusting device of C cross streams tandem photovoltaic square formation respectively.

Pattern 2); starting power when certain tandem photovoltaic square formation high_voltage isolation AC power adjusting device input photovoltaic group string power starts lower than tandem photovoltaic square formation high_voltage isolation AC power adjusting device; or tandem photovoltaic square formation high_voltage isolation AC power adjusting device breaks down when not exporting; due to nothing power supply; protection relay make and break contact closes; transformer input internal resistance r=0 Ω, does not affect angle-style three-phase alternating current tandem photovoltaic square formation and normally works.Now the grid-connected balance controller of star-angle type cannot receive the data of this tandem photovoltaic square formation high_voltage isolation AC power adjusting device.The grid-connected balance controller of star-angle type will perform the pattern 1 of three-phase equilibrium control strategy).

Mode 3), when a wherein lower limit power lower than angle-style three-phase alternating current tandem photovoltaic square formation of angle-style three-phase alternating current tandem photovoltaic square formation, and when energy-storage battery group cannot support angle-style three-phase alternating current tandem photovoltaic square formation balance adjustment, in the grid-connected balance controller of star-angle type, PLC is by multi computer communication module down-transmitting data, control all tandem photovoltaic square formation high_voltage isolation AC power adjusting devices to stop exporting, PLC controls the disconnection of synchronization AC contactor simultaneously, and angle-style three-phase alternating current tandem photovoltaic square formation and electrical network are departed from.

3, power optimization control strategy

When tandem photovoltaic square formation high_voltage isolation AC power adjusting device enters normal mode of operation, because irregular the blocking of cloud causes inverter output power different, make the power output of the tandem photovoltaic square formation high_voltage isolation AC power adjusting device in angle-style three-phase alternating current tandem photovoltaic square formation also different.Maximum for ensureing angle-style three-phase alternating current tandem photovoltaic square formation power output, the power output of all tandem photovoltaic square formation high_voltage isolation AC power adjusting devices of cross streams tandem photovoltaic square formation every in angle-style three-phase alternating current tandem photovoltaic square formation is sued for peace by star-angle type grid-connected balance controller respectively, calculate every cross streams tandem photovoltaic square formation power, and according to the energy-storage battery pool-size data received, output current when calculating angle-style three-phase alternating current tandem photovoltaic square formation poised state, again by the power output of each the tandem photovoltaic square formation high_voltage isolation AC power adjusting device in every cross streams tandem photovoltaic square formation divided by this cross streams tandem photovoltaic square formation electric current, calculate the output voltage of each tandem photovoltaic square formation high-voltage isolation device.This output voltage is one group of voltage that this cross streams tandem photovoltaic square formation optimizing power exports.Described optimization voltage correspondence is transferred in each tandem photovoltaic square formation high_voltage isolation AC power adjusting device of every cross streams tandem photovoltaic square formation by the grid-connected balance controller of star-angle type, the high_voltage isolation AC power adjusting device output voltage sum of all tandem photovoltaic square formations is equaled and site alternating voltage.As when without cloud block, in every cross streams tandem photovoltaic square formation, tandem photovoltaic square formation high_voltage isolation AC power adjusting device power output is identical, the grid-connected balance controller of star-angle type is according to Optimal Control Strategy simultaneously, the output voltage being assigned to each tandem photovoltaic square formation high_voltage isolation AC power adjusting device in every cross streams tandem photovoltaic square formation is also equal, the optimization voltage=of output site alternating voltage/tandem photovoltaic square formation high_voltage isolation AC power adjusting device series connection number.

When the controller module in tandem photovoltaic square formation high_voltage isolation AC power adjusting device receives after the grid-connected balance controller of star-angle type issues data, the CPU of controller module according to these data by light every circuit output pwm signal, this pwm signal controls 4 control input ends of the H bridge power driving circuit in energy storage DC/AC modular converter, export through H bridge power driving circuit, high voltage isolating transformer input winding coupled again through exchanging isolation and amplifier module exports the phase place of corresponding angle-style three-phase alternating current tandem photovoltaic square formation, frequency and power, again through exchanging two isolating switches of isolation and amplifier module, short switch output AC power.

Angle-style connect every cross streams tandem photovoltaic square formation in the 1st and m tandem photovoltaic square formation high_voltage isolation AC power adjusting device complete beyond above-mentioned functions, the CPU of controller module carries out charge and discharge control every control circui energy storage control circuit to three energy-storage battery groups that correspondence connects by light.

By in every cross streams tandem photovoltaic square formation of angle-style three-phase alternating current tandem photovoltaic square formation, the output series connection of m platform tandem photovoltaic square formation high_voltage isolation AC power adjusting device, composition angle-style three-phase alternating current tandem photovoltaic square formation, power output=m × tandem photovoltaic square formation high_voltage isolation AC power adjusting device the power output of every cross streams tandem photovoltaic square formation, m is the integer of >=1, and angle-style three-phase alternating current tandem photovoltaic square formation power output is the power output sum of three-phase alternating current tandem photovoltaic square formation.The output of the formula that is often in series photovoltaic arrays high_voltage isolation AC power adjusting device all by a grid-connected balance controller of star-angle type by communication link cooperation control.The watt level of tandem photovoltaic square formation high_voltage isolation AC power adjusting device and quantity determine the generate output of angle-style three-phase alternating current tandem photovoltaic square formation.

4, chance failure control strategy

During normal work, the synchronization pulse of the grid-connected balance controller of each tandem photovoltaic square formation high_voltage isolation AC power adjusting device Real-Time Monitoring star-angle type in angle-style three-phase alternating current tandem photovoltaic square formation and communication data, keep the output current Iacs with grid phase, Frequency Synchronization and tandem photovoltaic square formation high_voltage isolation AC power adjusting device, simultaneously to the grid-connected balance controller passback tandem photovoltaic square formation high_voltage isolation AC power adjusting device data of star-angle type and confirmation sync response information.When electrical network burst power-off, or the grid-connected balance controller of star-angle type surprisingly quits work, or communication data or lock-out pulse are when interrupting, or output current Iacs is when being reduced to angle-style three-phase alternating current tandem photovoltaic square formation operating current lower limit, tandem photovoltaic square formation high_voltage isolation AC power adjusting device responds fast, at short notice, as <20ms, enter acquiescence operating state, and the phase place of Real-Time Monitoring corresponding angle-style three-phase alternating current tandem photovoltaic square formation, frequency, information of voltage and lock-out pulse.

When certain the tandem photovoltaic square formation high_voltage isolation AC power adjusting device in angle-style three-phase alternating current tandem photovoltaic square formation breaks down:

1) when tandem photovoltaic square formation high_voltage isolation AC power adjusting device energy storage DC/AC modular converter damages, power stage is not had within the time of <5ms, now the controller module of tandem photovoltaic square formation high_voltage isolation AC power adjusting device still normally works, when controller module monitoring power output is different from the power data that the grid-connected balance controller of star-angle type issues, described controller module quick Control protection relay switch junction closure, transformer input internal resistance r=0 Ω, do not affect angle-style three-phase energy complement AC series formula photovoltaic arrays normally to work.Controller module uploads fault data to the grid-connected balance controller of star-angle type simultaneously.

2) input power of tandem photovoltaic square formation high_voltage isolation AC power adjusting device monitoring input photovoltaic group string.When short circuit, open circuit appear in certain road photovoltaic group string, the controller module of tandem photovoltaic square formation high_voltage isolation AC power adjusting device controls this maximal power tracing module from service, and fault message is uploaded to the grid-connected balance controller of star-angle type.

5, strategy is started after the fault recovery of tandem photovoltaic square formation high_voltage isolation AC power adjusting device

When angle-style three-phase alternating current tandem photovoltaic square formation normally works, the grid-connected balance controller of star-angle type obtain certain cross streams tandem photovoltaic square formation need startup separator recover after tandem photovoltaic square formation high_voltage isolation AC power adjusting device time, tandem photovoltaic square formation high_voltage isolation AC power adjusting device data after the grid-connected balance controller of star-angle type recovers according to startup separator, the phase place of corresponding angle-style three-phase alternating current tandem photovoltaic square formation is passed down in conjunction with three-phase equilibrium control strategy all tandem photovoltaic square formation high_voltage isolation AC power adjusting devices in angle-style three-phase alternating current tandem photovoltaic square formation, frequency and voltage information, tandem photovoltaic square formation high_voltage isolation AC power adjusting device middle controller module is according to the phase place received, frequency, voltage data and lock-out pulse, control H electrical bridge power driving circuit through exchanging isolation and amplifier module output AC power.

The present invention has the following advantages:

1, improve the output voltage of angle-style three-phase alternating current tandem photovoltaic square formation, reduce output current;

2, high-voltage AC transmission cable loss reduces, and can realize remote Long line transmission;

3, angle-style three-phase alternating current tandem photovoltaic square formation improves due to electric pressure, can realize the transformerless output under this electric pressure, Loss reducing, reduces costs;

4, relatively parallel photovoltaic arrays, by tandem photovoltaic square formation high_voltage isolation AC power adjusting device, angle-style three-phase alternating current tandem photovoltaic square formation can realize inverter and break the whole up into parts, and installs on the spot and abandons inverter control room and relevant device;

5, in angle-style three-phase alternating current tandem photovoltaic square formation, each tandem photovoltaic square formation high_voltage isolation AC power adjusting device is unified to be coordinated and managed by the grid-connected balance controller of star-angle type, possess three-phase equilibrium best power regulates, meritorious to compensate, reactive power compensation exports ability and energy dispatching management, improve grid supply quality;

6, because the generating of photovoltaic group string is vulnerable to the impact of cloud, output-power fluctuation is larger, the present invention increases certain energy storage device in angle-style three-phase alternating current tandem photovoltaic square formation, and energy storage energy is shared in three-phase alternating current tandem photovoltaic square formation, ensure angle-style three-phase alternating current tandem photovoltaic square formation power output relative equilibrium, stablize, can support in short-term electrical network simultaneously.

7, because angle-style three-phase alternating current tandem photovoltaic square formation output voltage improves, can and the grid-connected output in site, abandoned and confluxed, concentrate inversion, transformer equipment, greatly reduced, power loss and cost;

8, because tandem photovoltaic square formation high_voltage isolation AC power adjusting device adopts modular mode, natural air cooled volume is little, makes convenient engineering installation, uses reliably;

9, by the increase of stored energy capacitance, greatly improve photovoltaic generation to grid fluctuations affect, be conducive to accessing electrical network at high proportion, greatly reduce and abandon optical phenomenon.10, owing to reducing direct current conflux case, DC cabinet and direct current cable in a large number, greatly reduce because direct current draws the probability of electric arc, avoid the fire caused thus to occur.

Accompanying drawing explanation

Fig. 1 is single phase alternating current (A.C.) tandem photovoltaic square formation theory diagram in angle-style three-phase alternating current tandem photovoltaic square formation;

Fig. 2 is the adjacent two-phase of angle-style three-phase alternating current tandem photovoltaic square formation first and m tandem photovoltaic square formation high_voltage isolation AC power adjusting device and energy storage principle figure;

Fig. 3 is angle-style three-phase alternating current tandem photovoltaic square formation system block diagram;

Fig. 4 is H bridge power driving circuit schematic diagram;

Fig. 5 is the centralized photovoltaic generating system block diagram of prior art;

Fig. 6 is the group string data photovoltaic generating system block diagram of prior art;

Fig. 7 is tandem photovoltaic direct current square formation system block diagram.

Embodiment

The present invention is further illustrated below in conjunction with the drawings and specific embodiments.

Angle-style three-phase alternating current tandem photovoltaic square formation of the present invention is by A phase, B phase C phase three single phase alternating current (A.C.) tandem photovoltaic square formations, the first energy-storage battery group E_AB, the second energy-storage battery group E_BC, the 3rd energy-storage battery group E_CA, and the grid-connected balance controller composition of star-angle type.A phase, B phase C phase three single phase alternating current (A.C.) tandem photovoltaic square formation angle-style connect, composition angle-style three-phase alternating current tandem photovoltaic square formation, and be connected with the first energy-storage battery group E_AB, the second energy-storage battery group E_BC, the 3rd energy-storage battery group E_CA in three junctions difference correspondences of angle-style three-phase alternating current tandem photovoltaic square formation.Angle-style three-phase alternating current tandem photovoltaic square formation exports to input with the grid-connected balance controller of star-angle type and is connected, and the output of the grid-connected balance controller of star-angle type is connected with also site electrical network three-phase alternating-current supply.Under the grid-connected balance controller of star-angle type controls, coordinate angle-style A ~ C three-phase alternating current tandem photovoltaic square formation Differential Output.

Shown in Fig. 1, described single phase alternating current (A.C.) tandem photovoltaic square formation is composed in series by m platform tandem photovoltaic square formation high_voltage isolation AC power adjusting device, and m is the integer of >=1.

In described single phase alternating current (A.C.) tandem photovoltaic square formation, the output tail end Ac1_2 of the 1st tandem photovoltaic square formation high_voltage isolation AC power adjusting device is connected with the output head end Ac2_1 of the 2nd tandem photovoltaic square formation high_voltage isolation AC power adjusting device, 2nd tandem photovoltaic square formation high_voltage isolation AC power adjusting device output tail end Ac2_2 exports head end Ac3_1 with the 3rd tandem photovoltaic square formation high_voltage isolation AC power adjusting device and is connected, the rest may be inferred, m-1 platform tandem photovoltaic square formation high_voltage isolation AC power adjusting device output tail end Acm-1_2 exports head end Acm_1 with m platform tandem photovoltaic square formation high_voltage isolation AC power adjusting device and is connected, composition single phase alternating current (A.C.) tandem photovoltaic square formation.The head end Ac1_1 that 1st tandem photovoltaic square formation high_voltage isolation AC power adjusting device exports is that the head of single phase alternating current (A.C.) tandem photovoltaic square formation exports Uabc end, and it is that the tail of single phase alternating current (A.C.) tandem photovoltaic square formation exports Uo end that m platform tandem photovoltaic square formation high_voltage isolation AC power adjusting device exports tail end Acm_2.The input of every platform tandem photovoltaic square formation high_voltage isolation AC power adjusting device connects the output of photovoltaic group string.Wherein the first Uabc of single phase alternating current (A.C.) tandem photovoltaic square formation is connected with corresponding two groups of energy-storage battery groups respectively with tail Uo output.

In angle-style three-phase alternating current tandem photovoltaic square formation, the tail output Uo of A cross streams tandem photovoltaic square formation is connected with the first output Uabc of B cross streams tandem photovoltaic square formation, and is connected with the first energy-storage battery group E_AB, and tie point is Uab; The tail output Uo of B cross streams tandem photovoltaic square formation is connected with the first output Uabc of C cross streams tandem photovoltaic square formation, and is connected with the second energy-storage battery group E_BC, and tie point is Ubc; The tail output Uo of C cross streams tandem photovoltaic square formation is connected with the first output Uabc of A cross streams tandem photovoltaic square formation, and is connected with the 3rd energy-storage battery group E_CA, and tie point is Uca; The first output Uabc of every cross streams tandem photovoltaic square formation is connected two energy-storage battery groups respectively with tail output Uo.Star-angle type grid-connected balance controller input Uab, Ubc are connected with three tie points Uab, Ubc and Uca of angle-style three-phase alternating current tandem photovoltaic square formation with Uca, Uab, Ubc and Uca are also that the three-phase alternating current of angle-style three-phase alternating current tandem photovoltaic square formation exports, and output voltage values is respectively Vab, Vbc, Vca.

Consider that the generating of photovoltaic group string is vulnerable to the impact of cloud, output-power fluctuation is larger, the present invention utilizes the public connection Uab between the three-phase alternating current tandem photovoltaic square formation of angle-style three-phase alternating current tandem photovoltaic square formation, Ubc and Uca, the feature that current potential is equal, at Uab, Ubc and Uca tri-public junctions are connected respectively the first energy-storage battery group E_AB, second energy-storage battery group E_BC, 3rd energy-storage battery group E_CA, by every cross streams tandem photovoltaic square formation to the charge and discharge control of energy-storage battery group, ensure that angle-style three-phase alternating current tandem photovoltaic square formation power output is relatively stable.

As shown in Figure 3, the grid-connected balance controller of star-angle type is made up of synchronization AC contactor Jabc, circuit breaker Kabc, current/voltage transducer Dabc and PLC.Angle-style three-phase alternating current tandem photovoltaic square formation output Uab, Ubc, Uca are connected with also site three phase mains by the input of circuit breaker Kabc, the output of circuit breaker Kabc and current sensor series connection Dabc, and input in parallel with voltage sensor Dabc, synchronization AC contactor Jabc; Synchronization AC contactor Jabc exports Uab, Ubc, Uca output-parallel with angle-style three-phase alternating current tandem photovoltaic square formation.Uab, Ubc, Uca output of angle-style three-phase alternating current tandem photovoltaic square formation is connected with also site electrical network three phase mains by synchronization AC contactor Jabc, current sensor Dabc, circuit breaker Kabc.

Described PLC comprises logic analysis control module, time-sequence control module, analogue enlargement module, multi-computer communication module, input control module and output control module.Multi-computer communication module communication TDA, TDB, TDC port is corresponding to be respectively connected with the tandem photovoltaic square formation high_voltage isolation AC power adjusting device of the every phase of angle-style three-phase alternating current tandem photovoltaic square formation, be connected to communicating circuit input and output TD_A, TD_B, TD_C port of controller module, the tandem photovoltaic square formation high_voltage isolation AC power adjusting device real-time, interactive data of multi-computer communication module and the every phase of angle-style three-phase alternating current tandem photovoltaic square formation, PLC according to control strategy computational analysis, and provides phase place, lock in time and power output data;

Time-sequence control module synchronism output TBA, TBB, TBC port is corresponding to be respectively connected with the tandem photovoltaic square formation high_voltage isolation AC power adjusting device of angle-style A ~ every phase of C three-phase alternating current tandem photovoltaic square formation, is connected to synchronous circuit input TB_A, TB_B, TB_C terminal of controller module.PLC by time-sequence control module synchronism output TBA, TBB, TBC port in real time for angle-style A ~ C three-phase alternating current tandem photovoltaic square formation every mutually in tandem photovoltaic square formation high_voltage isolation AC power adjusting device the pulse of synchronization zero-cross point is provided;

Input control module is connected with electric current, voltage sensor Dabc data output end, real-time monitoring line voltage, electric current and frequency change, and the data message that will detect also site three phase mains carries out analytical calculation through logic analysis control module, provide angle-style A ~ C every cross streams tandem photovoltaic square formation phase place and data message by multi-computer communication module, exported the zero crossing synchronizing signal of angle-style A ~ C every cross streams tandem photovoltaic square formation by time-sequence control module synchronism output TBA, TBB, TBC port.Output control module is connected with synchronization AC contactor Jabc control end, controls the break-make of synchronization AC contactor Jabc.

As shown in Figure 2, the tandem photovoltaic square formation high_voltage isolation AC power adjusting device of composition single phase alternating current (A.C.) tandem photovoltaic square formation is by n maximal power tracing module, energy storage DC/AC modular converter U1, controller module U2, power module U6 and exchange isolation and amplifier module U7 and form, and n is the integer of >=1.

The output of described photovoltaic group string is connected with the input Pv_in of maximal power tracing module in tandem photovoltaic square formation high_voltage isolation AC power adjusting device, through this maximal power tracing module to photovoltaic group string MPPT maximal power tracing power output; The output Pm_out of n maximal power tracing module is in parallel, and Uin is in parallel with energy storage DC/AC modular converter U1, power module U6 input respectively again for n maximal power tracing module output Pm_out after parallel connection; N maximal power tracing module provides energy storage DC/AC modular converter U1, power module U6 power supply.Wherein the output Uout of power module U6 is connected with the power input Vdc of controller module U2, provides the working power of controller module U2; The sample circuit input of controller module U2 and control output end respectively with n maximal power tracing module, and energy storage DC/AC modular converter U1 connects; The output Po of energy storage DC/AC modular converter U1 inputs L2 with interchange isolation and amplifier module U7 and is connected, and output m_1, m_2 of exchanging isolation and amplifier module U7 export m_1, m_2 with adjacent tandem photovoltaic square formation high_voltage isolation AC power adjusting device and connect; Energy storage DC/AC modular converter U1 is connected with public energy-storage battery group.

Described maximal power tracing module by energy storage inductor L1, storage capacitor C1, power switch Q1, sustained diode 1, current sensor A1 and the busbar H+ that confluxes ,-form;

The positive-negative output end of each optical crosstalk volt group string is connected with positive input terminal Pv_in+, the negative input end Pv_in-of maximal power tracing module, the positive input terminal Pv_in+ of maximal power tracing module is connected with one end of energy storage inductor L1, the other end of energy storage inductor L1 is connected with the anode Q+ of power switch Q1 and sustained diode 1 positive pole respectively, and the negative pole of sustained diode 1 is connected with the positive input terminal of storage capacitor C1 positive pole, current sensor A respectively; The negative input end of current sensor A is held with the positive H+ of the busbar that confluxes and is connected, the negative input end of photovoltaic group string is connected with negative terminal Q-, the storage capacitor C1 negative pole of power switch Q1, the busbar H-negative terminal that confluxes respectively, and anode H+, the negative terminal H-of the busbar that confluxes also are positive output end Pm_out+, the negative output terminal Pm_out-of maximal power tracing module; The control end g1 of power switch Q1 connects every the corresponding output of circuit U 5 with the light in controller U2;

Described energy storage DC/AC modular converter U1 is made up of energy storage control circuit, H bridge power driving circuit, conflux busbar voltage sensor V3, phase monitor voltage sensor V1 and protection relay J1.Input positive and negative terminal UH+, UH-of H bridge power driving circuit respectively with energy storage control circuit, conflux busbar voltage sensor V3 conflux in parallel on busbar positive and negative terminal H+, H-; H bridge power driving circuit output Po1, Po2 respectively with protection relay J1 switch J1_1 contact two ends, phase monitor voltage sensor V1, exchange the input L2 winding parallel of isolation and amplifier module U7.

When angle-style three-phase energy complement AC series formula photovoltaic arrays normally works; when certain tandem photovoltaic square formation high_voltage isolation AC power adjusting device does not have power stage or breaks down; for ensureing that angle-style three-phase alternating current tandem photovoltaic square formation normally works; H bridge power driving circuit output Po1, Po2 are through protection relay J1 normally closed contact J1_1 short circuit; transformer is made to input internal resistance r=0 Ω; according to transformer principle, output impedance R=B ²r, wherein B is transformer voltage ratio, and r is transformer input impedance, thus output impedance R=0 Ω, can not affect angle-style three-phase alternating current tandem photovoltaic square formation and normally work.

Described H electrical bridge rate drive circuit is made up of phase monitor voltage sensor V1,4 power switch pipe Q2 ~ Q5 and 4 sustained diode 2 ~ D5; Every power switch pipe has a control input end, a power input and a power take-off.The input of every power switch pipe and output reverse parallel connection fly-wheel diode as shown in Figure 4; Every 2 power switch pipes series connection, i.e. D2 and D3, D4 and D5 series connection, form 2 groups of H bridge arm circuit; Often organize in H bridge arm circuit, a power switch pipe power input is connected with the output of another power switch pipe, and tie point is power take-off Po1, Po2 of H bridge arm circuit; The two ends of 2 groups of H bridge arm circuit are respectively positive input terminal and the negative input end of H bridge arm circuit; 2 groups of H bridge arm circuit compose in parallel H bridge power driving circuit, the anode UH+ of the H bridge arm circuit after parallel connection and negative terminal UH-is also anode UH+ and the negative terminal UH-of H bridge power driving circuit, power take-off Po1, Po2 of 2 groups of H bridge arm circuit are also 2 power take-offs Po1, Po2 of H bridge rate drive circuit, and the control input end g2 ~ g5 of 4 power switch pipes is also 4 control input end g2 ~ g5 of H bridge power driving circuit.

Described energy storage control circuit is made up of a power switch pipe Q7 and charging and discharging currents detecting sensor A1.One end of power switch pipe Q7 is connected with the input anode UH+ of H bridge power driving circuit and the busbar positive pole H+ that confluxes by the charging and discharging currents detecting sensor A1 of series connection, the other end of power switch pipe Q7 is the energy-storage battery group discharge and recharge incoming end HL+ of energy storage control circuit, and is connected with energy-storage battery group positive pole; Energy-storage battery group negative pole is connected with the busbar negative pole H-that confluxes; Power switch pipe Q7 control end g7 is also the control end of energy storage control circuit, and is connected every drive circuit U5 with controller module U2 light.

Described controller module is made up of every circuit U 5, synchronous circuit U8 and two-way communication circuit U3 CPU, A/D sample circuit U4, light.Input A_1 ~ the A_n of described A/D sample circuit U4 and the A1_1 output that corresponding current sensor A with n maximal power tracing module and energy storage DC/AC modular converter U1 charging and discharging currents detect current sensor A1 is respectively connected, and the input V_1 ~ V_3 of A/D sample circuit U4 is connected with the phase monitor voltage sensor V1 of the H bridge power driving circuit of energy storage DC/AC modular converter U1, energy-storage battery group voltage sensor senses port V_2, the busbar voltage sensor V2 that confluxes respectively.Described light is connected with the I/O port of CPU in controller module every the input of circuit U 5, and light is connected with the power switch Q1 control input end g1 of n maximal power tracing module every output g1_1 ~ gn_1 difference correspondence of circuit U 5; Light is connected with the control input end g6 of 4 control input end g2 ~ g5 of H bridge power driving circuit and the control switch pipe Q6 of protection relay circuit and accumulator control end g7 every output g2 ~ g7 difference correspondence of circuit U 5; One end of two-way communication circuit U3 is connected with the PORT COM of CPU in controller module, the other end TD_X of two-way communication circuit U3 is also the PORT COM TD_X of tandem photovoltaic square formation high_voltage isolation AC power adjusting device, by optical fiber or to be wirelessly connected with the multi computer communication module port TD in the grid-connected balance controller PLC of star-angle type, real-time exchange data.One end of synchronous circuit U8 is connected with the I/O port of CPU in controller module, the other end TB_X of synchronous circuit U8 is also the synchronous input end mouth TB_X of tandem photovoltaic square formation high_voltage isolation AC power adjusting device, by optical fiber or to be wirelessly connected with the time-sequence control module output TB in the grid-connected balance controller PLC of star-angle type, the tandem photovoltaic square formation high_voltage isolation AC power adjusting device realized in every cross streams tandem photovoltaic square formation exports synchronous with this phase electrical network zero crossing.

When the grid-connected balance controller of star-angle type judges to allow m tandem photovoltaic square formation high_voltage isolation AC power adjusting device access electrical network, the grid-connected balance controller of star-angle type controls the work of synchronization AC contactor, electrical network passes through circuit breaker, current/voltage transducer and synchronization AC contactor contact are connected with angle-style three-phase alternating current tandem photovoltaic square formation, in angle-style three-phase alternating current tandem photovoltaic square formation, m tandem photovoltaic square formation high_voltage isolation AC power adjusting device output of each single phase alternating current (A.C.) tandem photovoltaic square formation is by line voltage dividing potential drop, and by exchanging isolation and amplifier module high voltage isolating transformer oppositely by the phase place of angle-style three-phase alternating current tandem photovoltaic square formation every cross streams tandem photovoltaic square formation of correspondence, frequency, voltage couples is to the input winding terminal exchanging isolation and amplifier module, the controller module of tandem photovoltaic square formation high_voltage isolation AC power adjusting device reads phase place by phase monitor voltage sensor, the zero crossing synchronizing signal that frequency and information of voltage and the grid-connected balance controller of star-angle type provide, and this information data is passed back in star-angle type grid-connected balance controller multi computer communication module port by two-way communication circuit PORT COM.The grid-connected balance controller of star-angle type is according to the phase place of this three-phase alternating current tandem photovoltaic square formation, frequency, voltage data and synchronizing information, respectively by the port of multi computer communication module and the port of time-sequence control module corresponding send control data and synchronization pulse to tandem photovoltaic square formation high_voltage isolation AC power adjusting device, the controller module of tandem photovoltaic square formation high_voltage isolation AC power adjusting device, according to these data and synchronization pulse, controls H electrical bridge power driving circuit and exchanges output through exchanging isolation and amplifier module.

Described power module U6 is made up of DC/DC power supply, lightning arrester BL and protection relay circuit.The input Uin of DC/DC power supply is in parallel with the two ends of lightning arrester BL, and thunderbolt avoided by protection tandem photovoltaic square formation high_voltage isolation AC power adjusting device electrical equipment.The output Uout of DC/DC power supply is in parallel with the input of protection relay circuit; Described protection relay circuit is made up of relay J 1 and control switch pipe Q6.The power input of control switch pipe Q6 is also the negative input end of protection relay circuit; the power take-off of control switch pipe Q6 is connected with relay J 1 one end; the other end of relay J 1 is the positive input terminal of protection relay circuit, and the control input end g6 of control switch pipe Q6 is also the control input end g6 of protection relay circuit.

When DC/DC power supply is not activated, protection relay circuit two ends do not have voltage, the normally closed J1_1 junction closure of protection relay, tandem photovoltaic square formation high_voltage isolation AC power adjusting device output impedance R=0 Ω.When DC/DC power initiation output dc voltage, under the control of the controller, the opening and closing of foundation demand modeling normally closed J1_1 contact, to tandem photovoltaic square formation high_voltage isolation AC power adjusting device output impedance R=0 Ω or R=B for protection relay J1 ²r Ω controls, and r is the power input internal resistance exchanging isolation and amplifier module U7.

Described interchange isolation and amplifier module U7 is made up of high voltage isolating transformer T, isolating switch K1, an isolating switch K2 and short switch K3.Described high voltage isolating transformer T has a power input winding L 2 and a power stage winding L 3, and wherein the power input winding L 2 of high voltage isolating transformer T is also the input exchanging isolation and amplifier module U7; The two ends of power stage winding L 3 are connected with the input of isolating switch K1, isolating switch K2 respectively, the output of isolating switch K1, isolating switch K2 is connected with short switch K3 two ends respectively, short switch K3 two ends are the output terminals A cm_1, the Acm_2 that exchange isolation and amplifier module U7, also be tandem photovoltaic square formation high_voltage isolation AC power adjusting device output terminals A cm_1, Acm_2, output voltage is Uac.And high voltage isolating transformer isolation voltage > Uacsmax.Due to adding of high voltage isolating transformer, make the isolation voltage > Uacsmax of tandem photovoltaic square formation high_voltage isolation AC power adjusting device.Described Uacsmax is also referred to as the highest alternating voltage of system.Angle-style three-phase energy complement AC series formula photovoltaic arrays exports maximum A phase voltage respectively: Uasmax=Ua1max+Ua2max+Ua3max ... ,+Uammax; B phase voltage: Ubsmax=Ub1max+Ub2max+Ub3max ... ,+Ubmmax; C phase voltage: Ucsmax=Uc1max+Uc2max+Uc3max ... ,+Ucmmax; Uammax, Ubmmax, Ucmmax is that m tandem photovoltaic square formation high_voltage isolation AC power adjusting device exports maximum voltage value.M is the integer of >=1.The two ends of described high voltage isolating transformer T power input winding L 2 are connected with H bridge power driving circuit power take-off Po1, Po2 in energy storage DC/AC modular converter U1, and the power output of n maximal power tracing module is coupled to power stage winding L 3 output AC power through power input winding L 2 by energy storage DC/AC modular converter U1.

H bridge power driving circuit correspondence in tandem photovoltaic square formation high_voltage isolation AC power adjusting device exports phase place, frequency, the power of angle-style three-phase alternating current tandem photovoltaic square formation, through exchanging the high voltage isolating transformer T coupling output of isolation and amplifier module U7, and through isolating switch K1, isolating switch K2, short switch K3 output AC power.Short switch K3 is in open-circuit condition time normal, when a certain tandem photovoltaic square formation high_voltage isolation AC power adjusting device is safeguarded or angle-style three-phase alternating current tandem photovoltaic square formation is exited in replacing, normally work, by short switch K3 quick-make for not affecting angle-style three-phase alternating current tandem photovoltaic square formation.

As Fig. 2, shown in 3, the first described energy-storage battery group E_AB, second energy-storage battery group E_BC, when 3rd energy-storage battery group E_CA is connected with angle-style three-phase alternating current tandem photovoltaic square formation respectively, m tandem photovoltaic square formation high_voltage isolation AC power adjusting device output tail end Acm_2 wherein in a cross streams tandem photovoltaic square formation exports head end Ac1_1 respectively with the 1st tandem photovoltaic square formation high_voltage isolation AC power adjusting device in another cross streams tandem photovoltaic square formation with the busbar negative pole H-that confluxes and the busbar negative pole H-that confluxes is connected, make current potential residing for the 1st in adjacent two-phase AC series formula photovoltaic arrays and m tandem photovoltaic square formation high_voltage isolation AC power adjusting device equal.Thus can be in parallel by the energy-storage battery group discharge and recharge incoming end HL+ in adjacent two-phase the 1st and m tandem photovoltaic square formation high_voltage isolation AC power adjusting device, and be connected with one group of energy-storage battery group anode.Energy storage DC/AC modular converter U1 in adjacent two-phase the 1st and m the tandem photovoltaic square formation high_voltage isolation AC power adjusting device busbar negative terminal H-that confluxes is in parallel, and is connected with energy-storage battery group negative terminal.Energy-storage battery group discharge and recharge incoming end HL+ wherein in A cross streams tandem photovoltaic square formation the 1st tandem photovoltaic square formation high_voltage isolation AC power adjusting device and the busbar negative terminal H-that confluxes is connected with the 3rd energy-storage battery group E_CA is positive and negative, and battery pack E_AB is positive and negative is connected for the energy-storage battery group discharge and recharge incoming end HL+ in m tandem photovoltaic square formation high_voltage isolation AC power adjusting device and conflux busbar negative terminal H-and the first energy; Energy-storage battery group discharge and recharge incoming end HL+ wherein in B cross streams tandem photovoltaic square formation the 1st tandem photovoltaic square formation high_voltage isolation AC power adjusting device and the busbar negative terminal H-that confluxes is connected with the first energy-storage battery group E_AB is positive and negative, and the energy-storage battery group discharge and recharge incoming end HL+ in m tandem photovoltaic square formation high_voltage isolation AC power adjusting device and the busbar negative terminal H-that confluxes is connected with the second energy-storage battery group E_BC is positive and negative; Energy-storage battery group discharge and recharge incoming end HL+ wherein in C cross streams tandem photovoltaic square formation the 1st tandem photovoltaic square formation high_voltage isolation AC power adjusting device and the busbar negative terminal H-that confluxes is connected with the second energy-storage battery group E_BC is positive and negative, and the energy-storage battery group discharge and recharge incoming end HL+ in m tandem photovoltaic square formation high_voltage isolation AC power adjusting device and the busbar negative terminal H-that confluxes is connected with the 3rd energy-storage battery group E_CA is positive and negative.

The energy-storage battery group voltage sensor senses end of the A/D sample circuit U4 in the controller U2 of adjacent two-phase the 1st and m tandem photovoltaic square formation high_voltage isolation AC power adjusting device puts V_2 parallel connection, and exports with energy-storage battery group voltage sensor V2 data and be connected.

Angle-style three-phase alternating current tandem photovoltaic square formation system shown in Fig. 3 is compared with the tandem photovoltaic direct current square formation system shown in Fig. 7 with the group serial type photovoltaic generating system shown in the concentrated photovoltaic generating system shown in Fig. 5, Fig. 6, and the advantage of angle-style three-phase alternating current tandem photovoltaic square formation of the present invention is:

1. abandoned in the concentrated photovoltaic generating system shown in Fig. 5 in the angle-style three-phase alternating current tandem photovoltaic square formation shown in Fig. 3 and confluxed, install inverter, transformer equipment concentratedly.Same group serial type photovoltaic generating system shown in Fig. 6 relatively abandoned exchange conflux, transformer equipment.Because converging equipment is according to the quantity of station capacity configuration, and in photovoltaic system, converging equipment breaks down, and rate is high, loss is large.Angle-style three-phase alternating current tandem photovoltaic square formation of the present invention has abandoned a large amount of converging equipment and transformer equipment, decreases loss, reduces cost, improves reliability;

2. in the angle-style three-phase alternating current tandem photovoltaic square formation shown in Fig. 3, photovoltaic group string is connected with tandem photovoltaic square formation high_voltage isolation AC power adjusting device nearby, all be connected in series by unit cable between the tandem photovoltaic square formation high_voltage isolation AC power adjusting device of Fig. 3, angle-style three-phase alternating current tandem photovoltaic square formation maximum output current is that photovoltaic power station system capacity is divided by grid-connected dot system voltage, with photovoltaic plant capacity 10MW, system voltage 35kV is example then maximum output current=10MW/35kV=286A, being evenly distributed to electric current in every cross streams tandem photovoltaic square formation is 286A/3=95.3A.And in the system shown in Fig. 5, Fig. 6, converging equipment installation site must be taken into account many group photovoltaic group strings and lay layout, cause n multiple-twin cable in parallel in converging equipment to converging equipment installation site, (as 16 road header boxs complete 16 road photovoltaic group connection in series-parallel, number of cables is 16 × 2, its electric current that confluxes is 16 × 10A=160A, n platform group string inverter exchanges and exports an ac cable parallel connection through n × 4, the after-current that confluxes increases n doubly, and converging equipment is in parallel in 2 direct currents or 4 AC great current cables to upper level converging equipment or inverter again.Also with photovoltaic plant capacity 10MW, system voltage 500V for example then maximum output current=10MW/500V=20000A compare the angle-style three-phase equilibrium AC series formula photovoltaic arrays shown in Fig. 2, Fig. 3, the large number of cables of electric current is many, loss, cost increase;

3. the angle-style three-phase alternating current tandem photovoltaic square formation shown in Fig. 3, photovoltaic group string improves system voltage by the series connection between tandem photovoltaic square formation high_voltage isolation AC power adjusting device, if each tandem photovoltaic square formation high_voltage isolation AC power adjusting device output average voltage is 500v, system voltage is 35kV, then realize 35kV by every cross streams tandem photovoltaic square formation 35KV/500V=70 tandem photovoltaic square formation high_voltage isolation AC power adjusting device serial number to export, can far above Fig. 5, inverter input voltage <1000v shown in Fig. 6, under Same Efficieney condition, make cascaded structure electric current reduce, change parallel heavy-current transmission current mode, reduce the power loss of cable and equipment, and promote angle-style three-phase alternating current tandem photovoltaic square formation power,

4. in the angle-style three-phase alternating current tandem photovoltaic square formation shown in Fig. 3, the series connection of ganging up between tandem photovoltaic square formation high_voltage isolation AC power adjusting device of photovoltaic group improves the grid-connected point voltage of input, the grid-connected output of transless can be realized, and the photovoltaic generating system shown in Fig. 5, Fig. 6, due to the restriction of inverter input direct voltage < 1000v, inverter ac output voltage≤400v system transless can only be met grid-connected, more grid-connected then must the conversion through high-tension transformer of high voltage exports, and electric current is large, loss is large, cost is high;

5. the every cross streams tandem photovoltaic square formation in the angle-style three-phase alternating current tandem photovoltaic square formation shown in Fig. 3 is exchanged by tandem photovoltaic square formation high_voltage isolation AC power adjusting device initial and end 2 line to export, organizing two direct current cabless adopt with the centralized photovoltaic generating system of Fig. 5 under its equal power output condition in parallel more, group string data photovoltaic generating system shown in Fig. 6 adopts many groups 3 phase 4 line ac cable output-parallels to compare, cable greatly reduces, and electric current is little, reduce cable loss;

6. in the angle-style three-phase alternating current tandem photovoltaic square formation shown in Fig. 3, it is flexible that photovoltaic group ganged up tandem photovoltaic square formation high_voltage isolation AC power adjusting device output voltage, the series connection of photovoltaic group string under more low-voltage condition between tandem photovoltaic square formation high_voltage isolation AC power adjusting device can be made to improve output AC voltage, meet grid-connected point voltage.And the photovoltaic generating system shown in Fig. 5, Fig. 6, because the parallel-connection structure of photovoltaic group string limit, every optical crosstalk volt group connection in series-parallel output voltage is improved according to grid-connected voltage, the input starting resistor primary condition of inverter could be met, as in 380v ac grid system, photovoltaic group string output dc voltage > more than could meet and start inverter work primary condition.

7. the tandem photovoltaic square formation high_voltage isolation AC power adjusting device in the angle-style three-phase alternating current tandem photovoltaic square formation shown in Fig. 3, employing IP65 grade seals, natural air cooled modular design volume is little, locally can install, install simple.And the centralized photovoltaic generating system shown in Fig. 5, then inverter concentrated on inverter control room and adopt multi-form sealing and the type of cooling according to local environment, and consuming certain power.Angle-style three-phase alternating current tandem photovoltaic square array structure thus shown in Fig. 3 changes the centralized photovoltaic power generation structure shown in Fig. 5, a large amount of minimizing direct current conflux case, DC cabinet and direct current cable, greatly reduce because direct current draws the probability of electric arc, avoid the fire caused thus to occur.Is broken the whole up into parts in power station simultaneously and abandoned inverter control room simultaneously, greatly cost-saving expense.

8. the angle-style three-phase alternating current tandem photovoltaic square formation shown in Fig. 3 and the tandem photovoltaic direct current square formation systematic comparison shown in Fig. 7:

1) angle-style three-phase alternating current tandem photovoltaic square formation output AC has been abandoned tandem direct current photovoltaic arrays and has been exported rectifying output circuit, reduces the loss of rectification circuit.

2) because angle-style three-phase alternating current tandem photovoltaic square formation direct grid-connected exports, abandoned tandem direct current photovoltaic arrays and exported again grid-connected through inverter conversion output AC, reduced cost.

3) due to angle-style three-phase alternating current tandem photovoltaic square formation, be made up of three groups of AC series formula photovoltaic arrays, in the tandem photovoltaic square formation that the photovoltaic group string high-voltage isolation device of same power, quantity forms, angle-style three-phase alternating current tandem photovoltaic square formation power output is 3 times of tandem direct current photovoltaic arrays power output.

4) alternating current general-purpose electric material is selected many and cost is lower.

Claims

1. an angle-style three-phase alternating current tandem photovoltaic square formation, is characterized in that, described angle-style three-phase alternating current tandem photovoltaic square formation is made up of three single phase alternating current (A.C.) tandem photovoltaic square formations, energy-storage battery group and the grid-connected balance controller of star-angle type; Three described single phase alternating current (A.C.) tandem photovoltaic square formations connect to form angle-style three-phase alternating current tandem photovoltaic square formation by angle-style; Three outputs of angle-style three-phase alternating current tandem photovoltaic square formation connect three groups of energy-storage battery groups respectively; The output of angle-style three-phase alternating current tandem photovoltaic square formation is connected with the input of the grid-connected balance controller of star-angle type; The output of the grid-connected balance controller of star-angle type with and site electrical network three-phase alternating-current supply be connected; Three-phase alternating current tandem photovoltaic square formation, under the grid-connected balance controller of star-angle type controls, coordinates three-phase alternating current tandem photovoltaic square formation Differential Output.

2. according to angle-style three-phase alternating current tandem photovoltaic square formation according to claim 1, it is characterized in that, the first output of described single phase alternating current (A.C.) tandem photovoltaic square formation is connected with two groups of energy-storage battery groups respectively with tail output; In described angle-style three-phase alternating current tandem photovoltaic square formation, the tail output of A cross streams tandem photovoltaic square formation is connected with the first output of B cross streams tandem photovoltaic square formation, and is connected with the first energy-storage battery group, and tie point is Uab; The tail output of B cross streams tandem photovoltaic square formation is connected with the first output of C cross streams tandem photovoltaic square formation, and is connected with the second energy-storage battery group, and tie point is Ubc; The tail output of C cross streams tandem photovoltaic square formation is connected with the first output of A cross streams tandem photovoltaic square formation, and is connected with the 3rd energy-storage battery group, and tie point is Uca.

3. according to angle-style three-phase alternating current tandem photovoltaic square formation according to claim 1, it is characterized in that, when three groups of described energy-storage battery groups are connected with angle-style three-phase alternating current tandem photovoltaic square formation respectively, m tandem photovoltaic square formation high_voltage isolation AC power adjusting device output tail end wherein in a cross streams tandem photovoltaic square formation exports head end respectively with the 1st tandem photovoltaic square formation high_voltage isolation AC power adjusting device in another cross streams tandem photovoltaic square formation with the busbar negative pole that confluxes and the busbar negative pole that confluxes is connected, make current potential residing for the 1st in adjacent two-phase AC series formula photovoltaic arrays and m tandem photovoltaic square formation high_voltage isolation AC power adjusting device equal, thus can be in parallel by the energy-storage battery group discharge and recharge incoming end in adjacent two-phase the 1st and m tandem photovoltaic square formation high_voltage isolation AC power adjusting device, and be connected with one group of energy-storage battery group anode, energy storage DC/AC modular converter in adjacent two-phase the 1st and m the tandem photovoltaic square formation high_voltage isolation AC power adjusting device busbar negative terminal that confluxes is in parallel, and is connected with energy-storage battery group negative terminal,

Energy-storage battery group discharge and recharge incoming end in described A cross streams tandem photovoltaic square formation the 1st tandem photovoltaic square formation high_voltage isolation AC power adjusting device and the busbar negative terminal that confluxes are connected with the 3rd energy-storage battery group is positive and negative, and the energy-storage battery group discharge and recharge incoming end in m tandem photovoltaic square formation high_voltage isolation AC power adjusting device and the busbar negative terminal that confluxes are connected with the first energy-storage battery group is positive and negative; Energy-storage battery group discharge and recharge incoming end wherein in B cross streams tandem photovoltaic square formation the 1st tandem photovoltaic square formation high_voltage isolation AC power adjusting device and the busbar negative terminal that confluxes are connected with the first energy-storage battery group is positive and negative, and the energy-storage battery group discharge and recharge incoming end in m tandem photovoltaic square formation high_voltage isolation AC power adjusting device and the busbar negative terminal that confluxes are connected with the second energy-storage battery group is positive and negative; Energy-storage battery group discharge and recharge incoming end wherein in C cross streams tandem photovoltaic square formation the 1st tandem photovoltaic square formation high_voltage isolation AC power adjusting device and the busbar negative terminal that confluxes are connected with the second energy-storage battery group is positive and negative, and the energy-storage battery group discharge and recharge incoming end in m tandem photovoltaic square formation high_voltage isolation AC power adjusting device and the busbar negative terminal that confluxes are connected with the 3rd energy-storage battery group is positive and negative;

The energy-storage battery group voltage sensor senses end of the A/D sample circuit in the controller of described adjacent two-phase the 1st and m tandem photovoltaic square formation high_voltage isolation AC power adjusting device puts parallel connection, and exports with energy-storage battery group voltage sensor data and be connected.

4. according to angle-style three-phase alternating current tandem photovoltaic square formation according to claim 1, it is characterized in that, the tandem photovoltaic square formation high_voltage isolation AC power adjusting device of described single phase alternating current (A.C.) tandem photovoltaic square formation is by n maximal power tracing module, energy storage DC/AC modular converter, controller module, power module and exchange isolation and amplifier module and form, and n is the integer of >=1;

5., according to angle-style three-phase alternating current tandem photovoltaic square formation according to claim 4, it is characterized in that, described maximal power tracing module is made up of energy storage inductor, storage capacitor, power switch, fly-wheel diode, current sensor and the busbar that confluxes;

The positive output end of each optical crosstalk volt group string is connected with the positive-negative input end of maximal power tracing module, the positive input terminal of maximal power tracing module is connected with one end of energy storage inductor, the other end of energy storage inductor is connected with the anode of power switch and fly-wheel diode positive pole respectively, and the negative pole of fly-wheel diode is connected with the positive input terminal of storage capacitor positive pole, current sensor respectively; The negative input end of current sensor is connected with the busbar anode that confluxes, the negative input end of photovoltaic group string is connected with negative terminal, the storage capacitor negative pole of power switch, the busbar negative terminal that confluxes respectively, and the positive and negative end of the busbar that confluxes also is the positive and negative output of maximal power tracing module; The control end of power switch connects every the corresponding output of circuit with the light in controller module.

6. according to angle-style three-phase alternating current tandem photovoltaic square formation according to claim 4, it is characterized in that, described energy storage DC/AC modular converter is made up of energy storage control circuit, H bridge power driving circuit, the busbar voltage sensor that confluxes, phase monitor voltage sensor and protection relay; The input of H bridge power driving circuit respectively with energy storage control circuit, conflux busbar voltage sensor conflux in parallel on busbar; H bridge power driving circuit output respectively with protection relay make and break contact two ends, phase monitor voltage sensor, exchange the input winding parallel of isolation and amplifier module;

Described H electrical bridge rate drive circuit is made up of phase monitor voltage sensor, 4 power switch pipes and 4 fly-wheel diodes, and every power switch pipe has a control input end, a power input and a power take-off; The input of every power switch pipe and output reverse parallel connection fly-wheel diode; Every 2 power switch pipes series connection, forms 2 groups of H bridge arm circuit.Often organize in H bridge arm circuit, the input of a power switch tube power is connected with the output of another power switch pipe, and tie point is the power take-off of H bridge arm circuit; The two ends of 2 groups of H bridge arm circuit are respectively positive input terminal and the negative input end of H bridge arm circuit; 2 groups of H bridge arm circuit compose in parallel H bridge power driving circuit, the anode of the H bridge arm circuit after parallel connection and negative terminal are also anode and the negative terminal of H bridge power driving circuit, the power take-off of 2 groups of H bridge arm circuit is also 2 power take-offs of H bridge rate drive circuit, and the control input end of 4 power switch pipes is also 4 control input ends of H bridge power driving circuit.

7., according to angle-style three-phase alternating current tandem photovoltaic square formation according to claim 4, it is characterized in that, described controller module is made up of every circuit, synchronous circuit and two-way communication circuit CPU, A/D sample circuit, light;

The output that the input difference correspondence of described A/D sample circuit detects current sensor with the current sensor of each maximal power tracing module, energy storage DC/AC modular converter charging and discharging currents is connected, also be connected with the busbar that confluxes of energy storage DC/AC modular converter, the phase monitor voltage sensor of H bridge power driving circuit respectively, wherein A/D sample circuit also has an input port to be energy-storage battery group voltage sensor senses end simultaneously;

Described light is connected with the I/O port of CPU in controller module every the input of circuit, and light is connected with the control input end of the control switch pipe of the power switch control input end of each maximal power tracing module, 4 control input ends of H bridge power driving circuit and protection relay circuit and accumulator control end respectively every the output of circuit;

One end of described two-way communication circuit is connected with the PORT COM of CPU in controller module, the other end of two-way communication circuit is also the PORT COM of tandem photovoltaic square formation high_voltage isolation AC power adjusting device, by optical fiber or to be wirelessly connected with the multi computer communication module port in the grid-connected balance controller PLC of star-angle type, real-time exchange data;

One end of described synchronous circuit is connected with the I/O port of CPU in controller module, the other end of synchronous circuit is also the synchronous input end mouth of tandem photovoltaic square formation high_voltage isolation AC power adjusting device, by optical fiber or to be wirelessly connected with the time-sequence control module output in the grid-connected balance controller PLC of star-angle type, the tandem photovoltaic square formation high_voltage isolation AC power adjusting device realized in every cross streams tandem photovoltaic square formation exports synchronous with this phase electrical network zero crossing.

8., according to angle-style three-phase alternating current tandem photovoltaic square formation according to claim 4, it is characterized in that, described power module is made up of DC/DC power supply, lightning arrester and protection relay circuit; The input of DC/DC power supply is in parallel with the two ends of lightning arrester; The output of DC/DC power supply is in parallel with the input of protection relay circuit; Described protection relay electricity routing relay and control switch pipe composition; The power input of control switch pipe is also the negative input end of protection relay circuit; the power take-off of control switch pipe is connected with relay one end; the other end of relay is the positive input terminal of protection relay circuit, and the control input end of control switch pipe is also the control input end of protection relay circuit.

9. according to angle-style three-phase alternating current tandem photovoltaic square formation according to claim 4, it is characterized in that, described interchange isolation and amplifier module is made up of high voltage isolating transformer, two isolating switches and a short switch; The power input winding of described high voltage isolating transformer is also the input exchanging isolation and amplifier module; The two ends of power stage winding are connected with the input of two isolating switches respectively, the output of two isolating switches is connected with short switch two ends respectively, short switch two ends are the outputs exchanging isolation and amplifier module, also be tandem photovoltaic square formation high_voltage isolation AC power adjusting device output, output voltage is Uac;

10., according to angle-style three-phase alternating current tandem photovoltaic square formation according to claim 1, it is characterized in that, the grid-connected balance controller of described star-angle type is made up of synchronization AC contactor, circuit breaker, current/voltage transducer and PLC;

The output of described circuit breaker be also the grid-connected balance controller of star-angle type output with and site three phase mains be connected; The input of circuit breaker and current sensor series connection, and input in parallel with voltage sensor, synchronization AC contactor; Synchronization AC contactor input is also the input of the grid-connected balance controller of star-angle type and the output-parallel of angle-style three-phase alternating current tandem photovoltaic square formation.The output of angle-style three-phase alternating current tandem photovoltaic square formation is connected with also site electrical network three phase mains by synchronization AC contactor, current sensor, circuit breaker;

Described PLC comprises logic analysis control module, time-sequence control module, analogue enlargement module, multi-computer communication module, input control module and output control module;

Described multi-computer communication module respectively corresponding with angle-style three-phase alternating current tandem photovoltaic square formation often mutually in tandem photovoltaic square formation high_voltage isolation AC power adjusting device controller module in communicating circuit input/output port be connected, real-time, interactive data; PLC according to control strategy computational analysis, and provides phase place, lock in time and power output data;

Described time-sequence control module respectively corresponding every with angle-style three-phase alternating current tandem photovoltaic square formation mutually in tandem photovoltaic square formation high_voltage isolation AC power adjusting device controller module in synchronous circuit input terminal be connected, PLC by time-sequence control module in real time for angle-style three-phase alternating current tandem photovoltaic square formation often mutually in tandem photovoltaic square formation high_voltage isolation AC power adjusting device the pulse of synchronization zero-cross point is provided;

Described input control module passes with electric current/and the data output end of voltage sensor is connected, real-time monitoring line voltage, electric current and frequency change, and the data message that will detect also site three phase mains carries out analytical calculation, provided phase place and the data message of angle-style every cross streams tandem photovoltaic square formation by multi-computer communication module, exported the zero crossing synchronizing signal of angle-style every cross streams tandem photovoltaic square formation by time-sequence control module; Output control module in described PLC is connected with synchronization AC contactor control end, controls the break-make of synchronization AC contactor.

11. according to Claims 1-4 any one described in angle-style three-phase alternating current tandem photovoltaic square formation, it is characterized in that, as follows to the control method of described angle-style three-phase alternating current tandem photovoltaic square formation:

(1) Synchronization Control:

When the minimum number that the grid-connected balance controller of star-angle type monitors tandem photovoltaic square formation high_voltage isolation AC power adjusting device in every cross streams tandem photovoltaic square formation meets condition of work, the grid-connected balance controller of star-angle type controls the adhesive of synchronization AC contactor, makes three-phase alternating current tandem photovoltaic square formation grid-connected; The grid-connected balance controller of star-angle type is according to the phase place of angle-style three-phase alternating current tandem photovoltaic square formation, frequency, voltage data and synchronizing information, tandem photovoltaic square formation high_voltage isolation AC power adjusting device to correspondence sends control data and synchronization pulse, the controller module of tandem photovoltaic square formation high_voltage isolation AC power adjusting device is according to these data and synchronization pulse, and control H bridge power driving circuit exchanges output through exchanging isolation and amplifier module;

When angle-style three-phase alternating current tandem photovoltaic square formation normally works, the grid-connected balance controller of star-angle type is according to the tandem photovoltaic square formation high_voltage isolation AC power adjusting device return data in every cross streams tandem photovoltaic square formation, working strategies and calculate the zero crossing time, control data and synchronization pulse is sent to the tandem photovoltaic square formation high_voltage isolation AC power adjusting device in every cross streams tandem photovoltaic square formation, the controller module of tandem photovoltaic square formation high_voltage isolation AC power adjusting device is according to these data and synchronization pulse, control H bridge power driving circuit exchanges output through exchanging isolation and amplifier module,

(2) three-phase equilibrium controls:

When fluctuation appears in part output power of photovoltaic module, cause angle-style three-phase alternating current tandem photovoltaic square formation disequilibrium, the data analysis of each tandem photovoltaic square formation high_voltage isolation AC power adjusting device obtained calculates by the grid-connected balance controller of star-angle type, adjust the tandem photovoltaic square formation high_voltage isolation AC power adjusting device power output size in every cross streams tandem photovoltaic square formation, first the tandem photovoltaic square formation high_voltage isolation AC power adjusting device maximum power output except the 1st in every cross streams tandem photovoltaic square formation and m is guaranteed, one or two-phase alternating current tandem photovoltaic square formation that in three-phase alternating current tandem photovoltaic square formation, power output is on the low side, the power of its deficiency supplements by with this phase the 1st and m tandem photovoltaic square formation high_voltage isolation AC power adjusting device power output and corresponding energy-storage battery group, the surplus power that in other phase, the 1st and m tandem photovoltaic square formation high_voltage isolation AC power adjusting device do not export, is saved in corresponding energy-storage battery group by the 1st of correspondence and m tandem photovoltaic square formation high_voltage isolation AC power adjusting device, three groups of energy-storage battery pool-sizes due to angle-style three-phase alternating current tandem photovoltaic square formation are respectively three groups of adjacent two-phase AC series formula photovoltaic arrays and share energy-storage battery pool-size, then angle-style three-phase, AC series formula photovoltaic arrays Differential Output carries out charge and discharge control by the 1st of every cross streams tandem photovoltaic square formation and m tandem photovoltaic square formation high_voltage isolation AC power adjusting device to corresponding energy-storage battery group at the grid-connected balance controller of star-angle type,

When the grid-connected balance controller of star-angle type detects that energy-storage battery pool-size can not support that angle-style three-phase alternating current tandem photovoltaic square formation exports balance, the grid-connected balance controller of star-angle type is according to power optimization principle, obtain A to be in series photovoltaic arrays maximum output current, and utilize the A photovoltaic arrays maximum output current that is in series to calculate A and to be in series the output voltage of each tandem photovoltaic square formation high_voltage isolation AC power adjusting device in photovoltaic arrays, the cross streams tandem photovoltaic square formation that in calculating angle-style three-phase alternating current tandem photovoltaic square formation, generated output is minimum and the power proportions coefficient xb of another two cross streams tandem photovoltaic square formations, xc, this proportionality coefficient is utilized to calculate B phase respectively, C is in series the power output of each tandem photovoltaic square formation high_voltage isolation AC power adjusting device in photovoltaic arrays and output voltage values, each tandem photovoltaic square formation high_voltage isolation AC power adjusting device in the complementary tandem photovoltaic square formation of angle-style three-phase alternating current is respectively by the output voltage values output voltage of each tandem photovoltaic square formation high_voltage isolation AC power adjusting device of every phase, and B the be in series dump power that each tandem photovoltaic square formation high_voltage isolation AC power adjusting device in photovoltaic arrays exports of photovoltaic arrays and C that is in series is stored in the first energy-storage battery group of being connected corresponding to the 1st of every cross streams tandem photovoltaic square formation and m tandem photovoltaic square formation high_voltage isolation AC power adjusting device and the second energy-storage battery group respectively,

When a wherein lower limit power lower than angle-style three-phase alternating current tandem photovoltaic square formation of angle-style three-phase alternating current tandem photovoltaic square formation, and when energy-storage battery group cannot support angle-style three-phase alternating current tandem photovoltaic square formation balance adjustment, the grid-connected balance controller of star-angle type controls all tandem photovoltaic square formation high_voltage isolation AC power adjusting devices to be stopped exporting, control synchronization AC contactor to disconnect simultaneously, angle-style three-phase alternating current tandem photovoltaic square formation and electrical network are departed from;

(3) power optimization controls

When tandem photovoltaic square formation high_voltage isolation AC power adjusting device enters normal mode of operation, because blocking of cloud causes inverter output power different, make the power output of the tandem photovoltaic square formation high_voltage isolation AC power adjusting device in angle-style three-phase alternating current tandem photovoltaic square formation also different, maximum for ensureing angle-style three-phase alternating current tandem photovoltaic square formation power output, the power output of all tandem photovoltaic square formation high_voltage isolation AC power adjusting devices of cross streams tandem photovoltaic square formation every in angle-style three-phase alternating current tandem photovoltaic square formation is sued for peace by star-angle type grid-connected balance controller respectively, calculate every cross streams tandem photovoltaic square formation power, and according to the energy-storage battery pool-size data received, output current when calculating angle-style three-phase alternating current tandem photovoltaic square formation poised state, again by the power output of each the tandem photovoltaic square formation high_voltage isolation AC power adjusting device in every cross streams tandem photovoltaic square formation divided by this cross streams tandem photovoltaic square formation electric current, calculate the output voltage of each tandem photovoltaic square formation high-voltage isolation device, this output voltage is the voltage that this cross streams tandem photovoltaic square formation optimizing power exports, described optimization voltage transmission in each tandem photovoltaic square formation high_voltage isolation AC power adjusting device of every cross streams tandem photovoltaic square formation, makes the high_voltage isolation AC power adjusting device output voltage sum of all tandem photovoltaic square formations equal and site alternating voltage by the grid-connected balance controller of star-angle type, as when without cloud block, in every cross streams tandem photovoltaic square formation, tandem photovoltaic square formation high_voltage isolation AC power adjusting device power output is identical, the grid-connected balance controller of star-angle type is according to Optimal Control Strategy, the output voltage being assigned to each tandem photovoltaic square formation high_voltage isolation AC power adjusting device in every cross streams tandem photovoltaic square formation is also equal, the optimization voltage=of output site alternating voltage/tandem photovoltaic square formation high_voltage isolation AC power adjusting device series connection number,

(4) chance failure controls

When electrical network burst power-off, or the grid-connected balance controller of star-angle type surprisingly quits work, or communication data or lock-out pulse are when interrupting, or output current is when being reduced to angle-style three-phase alternating current tandem photovoltaic square formation operating current lower limit, tandem photovoltaic square formation high_voltage isolation AC power adjusting device enters acquiescence operating state, and the phase place of Real-Time Monitoring corresponding angle-style three-phase alternating current tandem photovoltaic square formation, frequency, information of voltage and lock-out pulse;

1) when tandem photovoltaic square formation high_voltage isolation AC power adjusting device energy storage DC/AC modular converter damages, power stage is not had within the time of <5ms, now the controller module of tandem photovoltaic square formation high_voltage isolation AC power adjusting device monitor power output different from the power data that the grid-connected balance controller of star-angle type issues time, described controller module quick Control protection relay switch junction closure, controller module uploads fault data to the grid-connected balance controller of star-angle type simultaneously;

2) input power of tandem photovoltaic square formation high_voltage isolation AC power adjusting device monitoring input photovoltaic group string; When short circuit, open circuit appear in certain road photovoltaic group string, the controller module of tandem photovoltaic square formation high_voltage isolation AC power adjusting device controls this maximal power tracing module from service, and fault message is uploaded to the grid-connected balance controller of star-angle type;

(5) control is started after the fault recovery of tandem photovoltaic square formation high_voltage isolation AC power adjusting device