CN104242338B - A kind of transformer station's micro-grid system containing distributed power source and control method - Google Patents

A kind of transformer station's micro-grid system containing distributed power source and control method Download PDF

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CN104242338B
CN104242338B CN201410428121.6A CN201410428121A CN104242338B CN 104242338 B CN104242338 B CN 104242338B CN 201410428121 A CN201410428121 A CN 201410428121A CN 104242338 B CN104242338 B CN 104242338B
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breaker
transformer
station
bus
output
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CN104242338A (en
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全凤岐
张海廷
赵庆杞
李春东
殷鹏
丛培元
张宏宇
李海龙
黄浩
于海俊
杜士鹏
胡旌伟
任知猷
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STATE GRID LIAONING ENERGY SAVING SERVICES Co Ltd
LIAONING ELECTRIC PROVER DEVELOPMENT Co Ltd
Shenyang Institute of Engineering
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STATE GRID LIAONING ENERGY SAVING SERVICES Co Ltd
LIAONING ELECTRIC PROVER DEVELOPMENT Co Ltd
Shenyang Institute of Engineering
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/50Photovoltaic [PV] energy
    • Y02E10/56Power conversion systems, e.g. maximum power point trackers

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Abstract

A kind of transformer station's micro-grid system containing distributed power source of the present invention and control method, belong to micro-capacitance sensor technical field, the control method of electrically-based electronic technology makes station micro-capacitance sensor realize intelligence, control flexibly, reaches station micro-capacitance sensor and forms " plug and play " function;When load changes, distributed power sources various in the micro-capacitance sensor of station are coordinated control, to ensure that station micro-capacitance sensor meets the quality of power supply requirement of load under different operational modes;For Voltage Drop, fault, power failure etc., the local information that micro-capacitance sensor collects is automatically brought to independent operating state, electrical network be uniformly coordinated;According to intensity of sunshine and the change of load, batteries duty is switched over and regulates, on the one hand the electric energy after adjustment is routed directly to direct current or AC load;On the other hand unnecessary electric energy is sent to batteries;When generated energy can not meet load needs, controller is sent to load the electric energy of battery, it is ensured that whole system work stability.

Description

A kind of transformer station's micro-grid system containing distributed power source and control method
Technical field
The invention belongs to micro-capacitance sensor technical field, be specifically related to a kind of transformer station's micro-grid system containing distributed power source and controlling party Method.
Background technology
Along with global economy and science and technology develop rapidly, world many countries using photovoltaic generation as development emphasis, photovoltaic The technological progress of industry has made Application of Solar Energy be possibly realized.At present, the application market of China's photovoltaic generation is in the starting stage, 2010, China increased photovoltaic generation newly and installs about 500MW, the accumulative 800MW that reaches, but the photovoltaic manufacture developed rapidly with China Industry is compared, and the pace of progress in photovoltaic application field substantially lags behind China's photovoltaic manufacturing industry;Photovoltaic generation market is mainly used In the outlying district electrification of the countryside, communication and commercial Application and photovoltaic commodity, including solar street light, Lawn lamp, Solar traffic light and solar energy Landscape Lighting etc., be not the most applied to transformer station, as to transformer station by photovoltaic industry A kind of means of solution of emergent event.
Substation Station electricity system is to ensure that the key of the safe and reliable transmission of converting station electric power, is also for user's continued power Important leverage.In current power system, 110kV and above transformer station have consequence, are the hinges of power system Point, full station will result in large-area power-cuts, or system break-down after having a power failure, plays an important role in regional power supply system.But These Substation Station electricity system majorities are to be dropped to by voltage after 380V negative in station by station local coordinate frame by substation secondary side Lotus and supervising device are powered, and mode is single unreliable, stand-by power supply can not continued power, self-healing ability and automatic switchover Working mould Formula aspect is the most perfect.In terms of saving the energy, owing to tradition electrical network fossil fuel produces electric energy, therefore inside transformer station Load consumption electric energy is also provided by, and can not make full use of regenerative resource is its power supply.Once station power use system or electrical network System jam, will directly affect the safe operation of power system first and second equipment, can cause large-area power failure time serious, Cause huge economic loss.If stand-by power supply can not continue reliable power supply, then cannot provide subsequent power during fault, become Power station internal communication, illuminate, therefore the visual plant such as monitoring will be unable to normally work, when system resumes power, it is impossible to ensure Each switchgear self-starting.And, keeping reforming and developing along with power system, unattended transformer station gets more and more, When after the station local coordinate frame dead electricity of on-load, the concentrator station operator on duty is needed to carrying out operation in transformer station and could recover to take electric to be System.Therefore, traditional Substation Station electricity system also exists for the potential safety hazard of many.
Summary of the invention
For the shortcoming of prior art, the present invention proposes a kind of transformer station's micro-grid system containing distributed power source and control method, To reach the intelligence control flexibly of station micro-capacitance sensor, improve the purpose of the stability of whole system work.
A kind of transformer station's micro-grid system containing distributed power source, including the first transformer, the second transformer, the 3rd transformer, First breaker, the second breaker, the 3rd breaker, the 4th breaker, the 5th breaker, the 6th breaker, the 7th open circuit Device, the 8th breaker, the 9th breaker, the tenth breaker, the 11st breaker, the 12nd breaker, the 13rd breaker, 14th breaker, the 15th breaker, the 16th breaker, the 17th breaker, the 18th breaker, the 19th open circuit Device, the 20th breaker, the 21st breaker, the 22nd breaker, the 23rd breaker, the 24th breaker, 25th breaker, the 26th breaker, the first twin-power switch, the second twin-power switch, controller and display, Wherein,
Between metope photovoltaic panel and the first combining inverter that the first described transformer is arranged in electrical network, the second transformer is arranged Between roof photovoltaic panel and the second combining inverter in electrical network, the microgrid battery and that the 3rd transformer is arranged in electrical network Between one two-way inverter, the first transformer output, the second transformer output and the 3rd transformer output are by bus even Connect the input of controller;
First described breaker one end connects microgrid 380V/AC bus, and the other end connects transformer station's 380V/AC bus;The Two breaker one end connect the first combining inverter, and the other end connects microgrid 380V/AC bus;3rd breaker one end connects the Two combining inverters, the other end connects microgrid 380V/AC bus;4th breaker one end connects the first two-way inverter, another End connects microgrid 380V/AC bus;5th breaker one end connects microgrid 380V/AC bus, and the other end connects first pair of electricity One end of source switch double end side;6th breaker one end connects microgrid 380V/AC bus, and the other end connects the second twin-power switch One end of double end side;7th breaker one end connection transformer station 380V/AC bus, other end docking station alternating current feeder line, the Eight breaker one end connect transformer station's 380V/AC bus, other end docking station alternating current feeder line, and the 9th breaker one end connects Transformer station's 380V/AC bus, other end docking station alternating current feeder line, the tenth breaker one end connects transformer station 380V/AC Bus, other end docking station alternating current feeder line;11st breaker one end connects microgrid 380V/AC bus, and the other end connects Standby change 380V/AC bus, the 12nd breaker one end connects microgrid 380V/AC bus, other end connecting communication, monitoring Or lighting apparatus, the 13rd breaker one end connects microgrid 380V/AC bus, other end connecting communication, monitoring or lighting apparatus; One end of 14th breaker connects standby change 380V/AC bus, and the other end is simultaneously connected with the first twin-power switch double end side second End and second twin-power switch double end side the second end;15th breaker one end connects the single head side of the second twin-power switch, another End connects the second two-way inverter input terminal in electrical network, and the single head side of the second twin-power switch connects the charger input in electrical network End;16th breaker one end connects the output of the charger in electrical network, and it is female that the other end connects first paragraph transformer station 220V/DC Line, the 17th breaker one end connects the first stop battery in electrical network, and it is female that the other end connects first paragraph transformer station 220V/DC Line, the 18th breaker one end connects the second two-way inverter in electrical network, and it is female that the other end connects second segment transformer station 220V/DC Line, the 19th breaker one end connects the second station battery in electrical network, and it is female that the other end connects second segment transformer station 220V/DC Line;20th breaker one end connection first paragraph transformer station 220V/DC bus, other end docking station direct current feeder line, second 11 breaker one end connect first paragraph transformer station 220V/DC bus, other end docking station direct current feeder line, and the 22nd breaks Device one end, road connects first paragraph transformer station 220V/DC bus, other end docking station direct current feeder line, the 23rd breaker one End connects second segment transformer station 220V/DC bus, other end docking station direct current feeder line, and the 24th breaker one end connects Second segment transformer station 220V/DC bus, other end docking station direct current feeder line, the 25th breaker one end connects second segment Transformer station's 220V/DC bus, other end docking station direct current feeder line;26th breaker one end connects first paragraph transformer station 220V/DC bus, the other end connects second segment transformer station 220V/DC bus;
The current transformer output of the first described breaker, the current transformer output of the second breaker, the 3rd breaker Current transformer output, the current transformer output of the 4th breaker, the current transformer output of the 5th breaker, The current transformer output of the 6th breaker, the current transformer output of the 7th breaker, the Current Mutual Inductance of the 8th breaker Device output, the current transformer output of the 9th breaker, the current transformer output of the tenth breaker, the 11st open circuit The current transformer output of device, the current transformer output of the 12nd breaker, the 13rd breaker current transformer defeated Go out end, the current transformer output of the 14th breaker, the current transformer output of the 15th breaker, the 16th open circuit The current transformer output of device, the current transformer output of the 17th breaker, the 18th breaker current transformer defeated Go out end, the current transformer output of the 19th breaker, the current transformer output of the 20th breaker, the 21st break The current transformer output of road device, the current transformer output of the 22nd breaker, the 23rd breaker electric current mutual Sensor output, the current transformer output of the 24th breaker, the current transformer output of the 25th breaker and The current transformer output of the 26th breaker all connects controller by bus;
The current transformer output of the station local coordinate frame output breaker in electrical network and the electricity of spare transformer output breaker Current transformer output connects controller by bus;
The output of controller connects the control end of each breaker respectively by bus;
The output of controller connects the input of display.
The current transformer output of the first described twin-power switch and the current transformer output of the second twin-power switch also lead to Cross bus and connect controller.
Realize containing the control method of transformer station's micro-grid system of distributed power source, comprise the following steps:
Step 1, employing controller control the 11st breaker, the 14th breaker and spare transformer output breaker and are in Dividing position state, the plug-in strip controlling the first twin-power switch and the second twin-power switch is in main transformer end, and it is equal to control other breakers It is in "on" position, makes system enter main transformer duty;
Step 2, the current value of employing the 3rd transformer Real-time Collection microgrid battery input, it is judged that the current value collected Whether reach setting value, the most then controller control the 4th breaker is in a point position state;Otherwise, Real-time Collection is continued;
Use the current value of the current transformer Real-time Collection first stop battery input of the 17th breaker, it is judged that gathered To current value whether reach setting value, the most then controller control the 17th breaker be in a point position state;Otherwise, continue Real-time Collection;
Use the current value of the current transformer Real-time Collection second station battery input of the 19th breaker, it is judged that gathered To current value whether reach setting value, the most then controller control the 19th breaker be in a point position state;Otherwise, continue Real-time Collection;
Step 3, when station local coordinate frame output breaker detects that the change of 35KV station is broken down, controller send signal Disconnected to station local coordinate frame output breaker, the first breaker, the 7th breaker, the 8th breaker, the 9th breaker and the tenth Road device so that it is be in a point position state, controls at spare transformer output breaker, the 11st breaker and the 14th breaker In "on" position, and the plug-in strip controlling the first twin-power switch and the second twin-power switch is in standby change end, makes system enter standby Use transformer duty;
Step 4, when the current transformer of spare transformer output breaker detects that current value sports 0, then control Five breakers, the 11st breaker and the 14th breaker are in a point position state, control the 26th breaker closing, and control First twin-power switch disconnects, the plug-in strip of the second twin-power switch accesses main transformer end, makes system enter microgrid duty;
Step 5, when system enter microgrid duty time, set the priority of DC load according to the actual requirements, according to preferentially Level, disconnects the breaker corresponding to DC load that priority is low;
Step 6, use first transformer Real-time Collection metope photovoltaic panel output current value, use the second transformer Real-time Collection The current value of roof photovoltaic panel output, if the current value gathered is more than 0, then system worked well, if the current value gathered is equal to 0, Then control the second breaker and the 3rd breaker is in a point position state, and control the 4th breaker, the 17th breaker and the 19th Breaker is in "on" position;
Step 7, when the change of 35KV station restores electricity, station local coordinate frame output breaker detect its both end voltage difference, If voltage difference is 0, then keeping constant, otherwise, then the output voltage phase place of each combining inverter in adjustment electrical network, makes microgrid 380V/AC busbar voltage frequency is identical with transformer station 380V/AC busbar voltage frequency and phase place with phase place, or in the scope allowed In, and control station local coordinate frame output breaker, the first breaker, the 7th breaker, the 8th breaker, the 9th breaker Being in "on" position with the tenth breaker, the 26th breaker is in a point position state, controls the first twin-power switch disconnecting link and is positioned at Main transformer end, all puts into station DC load.
Described in step 5 according to priority, disconnect the breaker corresponding to DC load that priority is low, the breaker of disconnection Several border requirements set factually, and the priority of communication, monitoring and lighting apparatus is the highest.
The scope of the permission described in step 7 sets according to the actual requirements.
The invention have the advantages that
The present invention is a kind of transformer station's micro-grid system containing distributed power source and control method, the control of electrically-based electronic technology Method makes station micro-capacitance sensor realize intelligence, control flexibly, reaches station micro-capacitance sensor and forms " plug and play " function;When station is with micro- When load in electrical network changes, by distributed power sources various in the micro-capacitance sensor of station effectively being coordinated control, to protect Card station micro-capacitance sensor can meet the quality of power supply requirement of load under different operational modes;Stand with the control of micro-capacitance sensor according to being Information in electrical network is made autonomic response by system information, for Voltage Drop, fault, power failure etc., this locality that micro-capacitance sensor collects Information is automatically brought to independent operating state, electrical network be uniformly coordinated scheduling;According to intensity of sunshine and the change of load, constantly to storage The duty of battery pack switches over and regulates: on the one hand the electric energy after adjustment is routed directly to direct current or AC load;Another Aspect is sent to batteries storage unnecessary electric energy;When generated energy can not meet load needs, controller is the electric energy of battery It is sent to load, it is ensured that the stability of whole system work.
Accompanying drawing explanation
Fig. 1 is the overall system architecture block diagram of an embodiment of the present invention;
Fig. 2 is the controller circuitry schematic diagram of an embodiment of the present invention;
Fig. 3 is generating and the flow chart of internal consumption electric energy of the micro-grid system of an embodiment of the present invention;
Fig. 4 is the control method flow chart of the transformer station's micro-grid system containing distributed power source of an embodiment of the present invention.
Detailed description of the invention
Below in conjunction with the accompanying drawings an embodiment of the present invention is described further.
As it is shown in figure 1, the embodiment of the present invention contains transformer station's micro-grid system of distributed power source, including the first transformer CT1、 Second transformer CT2, the 3rd transformer CT3, the first circuit breaker Q F1, the second circuit breaker Q F2, the 3rd circuit breaker Q F3, Four circuit breaker Q F4, the 5th circuit breaker Q F5, the 6th circuit breaker Q F6, the 7th circuit breaker Q F7, the 8th circuit breaker Q F8, the 9th Circuit breaker Q F9, the tenth circuit breaker Q F10, the 11st circuit breaker Q F11, the 12nd circuit breaker Q F12, the 13rd circuit breaker Q F13、 14th circuit breaker Q F14, the 15th circuit breaker Q F15, the 16th circuit breaker Q F16, the 17th circuit breaker Q F17, the 18th Circuit breaker Q F18, the 19th circuit breaker Q F19, the 20th circuit breaker Q F20, the 21st circuit breaker Q F21, the 22nd break Road device QF22, the 23rd circuit breaker Q F23, the 24th circuit breaker Q F24, the 25th circuit breaker Q F25, the 26th Circuit breaker Q FD, the first twin-power switch QF8-1, the second twin-power switch QF8-2, controller and display;
In Fig. 1,1 is expressed as microgrid 380V/AC bus;2 are expressed as transformer station's 380V/AC bus;3 are expressed as standby change 380V/AC bus;4 are expressed as transformer station's 220V/DC bus 1 section;5 are expressed as transformer station's 220V/DC bus 2 sections;T1 It is expressed as main transformer;T2It is expressed as spare transformer.
In the embodiment of the present invention, as in figure 2 it is shown, controller uses 8086 types CPU, wherein, pin AD15~AD0 is ground Location/data/address bus;Breaker uses Ray-Ban LPCPS-100, LPCPS-45 model, wherein, QF1、QF2、QF3、QF11、 QF14、QF17、QF18、QF19、QF20And QFDUsing LPCPS-100 model breaker, remaining breaker uses LPCPS-45 Model;First twin-power switch QF8-1With the second twin-power switch QF8-2Use the OTM200E4C10D380C model of ABB; Transformer uses upwards OPCT18AL model, and display uses Dell's S2340L model, and its input connects controller A19/S6~A16/S3 end.
In the embodiment of the present invention, controller has the management to micro battery, energy storage device management, load management, suspension with grid-connected Control function.Transformer and breaker upload respective status information through communication line, including PCC point (commonly connected Point) line voltage, electric current, frequency, phase angle;Each micro battery output voltage, electric current, frequency, phase angle;Breaker leads to Disconnected state;Load parameter, including the size of load, voltage, electric current, frequency, power factor;Formulate according to the data obtained The switching of micro battery, working method switch, power output regulation, and the break-make of breaker controls, then by setting value and control life Order sends each adjusting means, maintains the properly functioning of micro-capacitance sensor.
In the embodiment of the present invention, as it is shown on figure 3, when output power PoutDuring more than DC load end power P, directly to this Ground DC load is powered;1. as dump energy (Pout-P) more than AC load end power P ' time, then directly this locality is handed over Current load is powered, now, if dump energy PleftWhen being not 0, controller sends PWM ripple and drives battery-operated, Carry out batteries to store energy;2. as dump energy (Pout-P) less than AC load end power P ' time, it is judged that existing battery stores energy Whether amount W is more than existing required electric energy W ", the most then controller sends PWM ripple and drives battery-operated, to AC load Power supply;Otherwise, controller send PWM ripple drive net-connected controller so that breaker closing in net-connected controller, now by Electrical network replenishment system energy gap;
In the embodiment of the present invention, PCC point uploads the parameter of electrical network by transformer and breaker, including the voltage of electrical network, electric current, Frequency, phase angle;Under networked mode (stand and be incorporated into the power networks with micro-capacitance sensor and normal grid), by line voltage, frequency with micro- Electrical network current voltage and frequency compare, and analyse whether to synchronize, if deviation is in allowed band, i.e. pressure reduction is 10%, and frequency difference exists 0.3Hz, will regulation energy storage device and photovoltaic cell power output, with as early as possible with synchronized;If deviation exceedes allowed band, Then calculating reactive power compensation amount, and this value is sent to energy storage device, order energy storage device sends idle, maintains system to put down Weighing apparatus.
In the embodiment of the present invention, when monitoring electrical network and the power quality problems such as voltage disturbance or power failure occur, micro-capacitance sensor turns Enter island mode (stand and disconnect and independent operating with micro-capacitance sensor and electrical network);When station electrical network is sent a telegram here, detection current electric grid and micro-electricity The voltage of net, frequency, phase angle, if micro-capacitance sensor is asynchronous with electrical network, then calculate the parameter difference of electrical network and micro-capacitance sensor, calculate Going out compensation rate, compensation rate is sent to micro-capacitance sensor, regulation power exports, synchronization with electrical network as early as possible.
In the embodiment of the present invention, the power voltage controller of photovoltaic panel self sends working method (MPPT maximum power point tracking MPPT/ Determine voltage) to photovoltaic panel, output voltage, electric current, frequency, active power, reactive power are to controller;During networked mode, control Device processed is operated under MPPT mode;During island mode, when photovoltaic panel power output is full of more than load power consumption, battery And when energy storage device is full of, the controller controlling photovoltaic panel changes the method for operation, is operated in and determines under voltage system, otherwise answers one Directly remain operating in MPPT mode;When photovoltaic panel power output is 0, the controller of photovoltaic panel is out of service.
In the embodiment of the present invention, the power voltage controller of battery self by working method current for energy storage, the voltage of discharge and recharge, Electric current, active power of output, reactive power, state-of-charge send to controller;During networked mode: controller controls electric power storage Pond is only operated under the working method of charging, when battery underfill being detected, then continues charging, if being full of, then stops filling Electricity;During island mode: when photovoltaic power output is less than load power consumption, or photovoltaic power output is zero, and electric power storage detected There is energy storage in pond, then battery discharging;When battery power output is 0, the controller of battery self is out of service.
In the embodiment of the present invention, when networked mode, controller detects the break-make situation of breaker in real time, when certain branch road or joint When point voltage, electric current are too high, the breaker of this branch road or node should be cut off rapidly, and notify that maintenance personal fast releases fault, Ensure the normal power supply of load;When island mode, circuit breaker Q FGQuick acting disconnection and the connection of electrical network, micro-capacitance sensor enters Island mode;Breaker actuation cuts off the power supply of one load, it is ensured that the load normal power supply that priority is high;When micro-capacitance sensor is powered When being still unsatisfactory for sensitive load demand, should be by junior load excision of powering in load, it is ensured that the high load of priority is just Often power supply;When the voltage of certain load bus exceedes allowed band, i.e. the 10 of load rated voltage, according to reactive-load compensation Algorithm calculates reactive-load compensation amount, and the transmission of reactive-load compensation amount is carried out voltage-regulation to the reactive-load compensator within electrical network.
In the embodiment of the present invention, the first transformer CT1Between the metope photovoltaic panel and the first combining inverter that are arranged in electrical network, Second transformer CT2Between the roof photovoltaic panel and the second combining inverter that are arranged in electrical network, the 3rd transformer CT3It is arranged at Between microgrid battery and the first two-way inverter in electrical network, the first transformer CT1Output, the second transformer CT2Output End and the 3rd transformer CT3Output connects the input of controller by bus.
In the embodiment of the present invention, photovoltaic panel is English profit solar panel YL300C35b model;Combining inverter is power foot DL-3N40KW model, two-way inverter is middle ship heavy industry roc power PECG1/2/3 model;Battery is god of unusual strength 2-800 LBT Model.
In inventive embodiments, two-way inverter is applicable to the application scenario of the dynamic energy storage of various needs, when electric energy is had more than needed by electric energy Storage, exports after the electric energy inversion of storage to electrical network during electric energy deficiency;Emergent independent reversion reaction is played in microgrid.
In the embodiment of the present invention, mode of operation is automatically changed and is realized by two-way inverter;Two-way AC/DC converter realizes dividing Cloth DC power-supply system and the mutual support of electrical network, control the energy mutual transmission between dc bus and electrical network;Two-way change The control target of parallel operation is to make energy realize way traffic, both can realize rectification, can realize again inversion;DC side busbar voltage is steady Being scheduled near rated value, grid side current waveform sine and power factor are 1;When DC bus-bar voltage is less than rated value, Energy by two-way AC/DC converter from electrical grid transmission to direct-current micro-grid, thus improve DC bus-bar voltage;When dc bus electricity When pressure is higher than rated value, energy is female through two-way AC/DC converter direct current in electrical grid transmission, control direct-current micro-grid by direct-current micro-grid Line voltage drops near rated value, thus maintains the stable operation of direct-current micro-grid.
In the embodiment of the present invention, combining inverter becomes the direct current in battery into the 380V city of standard, and to be electrically accessed user side low High-voltage fence sent into by voltage electric grid or boosted transformer;The direct current that photovoltaic panel is sent by it is converted to the exchange identical with power network Electricity, according to the sunshine condition of sunrise to sunset, under the conditions of different ambient temperatures and Intensity of the sunlight, makes photovoltaic panel to the greatest extent Amount keeps the duty of maximum power output;Suppress higher harmonic current to flow into electrical network time grid-connected, reduce the impact on electrical network; Mediate abnormal conditions, safeguards system safe operation;The technology of PLL phaselocked loop ensures that the output of inverter keeps Tong Bu with electrical network; In control, using multi partitioning to control frequency, when frequency reduces, inverter strengthens meritorious output, and when frequency increases, Reduce meritorious output.
In the embodiment of the present invention, photovoltaic generation is applied to conventional stations electrical network, utilizes the photovoltaic effect of solar panel by light Electric energy can be converted to, then battery pack is charged, by inverter, direct current is converted to alternating current and load is powered.
In the embodiment of the present invention, battery pack (microgrid battery and station battery) simultaneously works as energy adjustment peace in systems Weighing apparatus load two acts on greatly;The electric energy that photovoltaic generating system exports is converted into chemical energy and stores, in case making during electricity shortage by it With.
In the embodiment of the present invention, it is provided with battery management system (BMS): to cell overvoltage, under-voltage, overtemperature alarm, electricity Pond group overcharges, excessively puts, crosses stream alarm and protection, cut-out etc..BMS has the analyzing and diagnosing function of battery performance, can be according in real time Measure the parameters such as battery module voltage, charging and discharging currents, temperature and cell terminal voltage, the calculated internal resistance of cell, By analyzing and diagnosing model, draw cell current capacities or the diagnosis of residual capacity (SOC), cell health status (SOH) diagnosis, battery state assessment, and the estimation of sustainable discharge time under current state when electric discharge.
In the embodiment of the present invention, the use time of Substation Station battery can be extended by twin-power switch.
In the embodiment of the present invention, the first circuit breaker Q F1One end connects microgrid 380V/AC bus, and the other end connects transformer station 380V/AC bus;Second circuit breaker Q F2One end connects the first combining inverter, and the other end connects microgrid 380V/AC bus; 3rd circuit breaker Q F3One end connects the second combining inverter, and the other end connects microgrid 380V/AC bus;4th circuit breaker Q F4 One end connects the first two-way inverter, and the other end connects microgrid 380V/AC bus;5th circuit breaker Q F5One end connects microgrid 380V/AC bus, the other end connects the first twin-power switch QF8-1One end of double end side;6th circuit breaker Q F6One end connects Microgrid 380V/AC bus, the other end connects the second twin-power switch QF8-2One end of double end side;7th circuit breaker Q F7One end Connect transformer station's 380V/AC bus, other end docking station alternating current feeder line, the 8th circuit breaker Q F8One end connects transformer station 380V/AC bus, other end docking station alternating current feeder line, the 9th circuit breaker Q F9One end connects transformer station's 380V/AC bus, Other end docking station alternating current feeder line, the tenth circuit breaker Q F10One end connects transformer station's 380V/AC bus, and the other end connects Stand and use alternating current feeder line;11st circuit breaker Q F11One end connects microgrid 380V/AC bus, and the other end connects standby change 380V/AC bus, the 12nd circuit breaker Q F12One end connect microgrid 380V/AC bus, other end connecting communication, monitoring or Lighting apparatus, the 13rd circuit breaker Q F13One end connects microgrid 380V/AC bus, other end connecting communication, monitors or illuminates Equipment;14th circuit breaker Q F14One end connect standby change 380V/AC bus, the other end is simultaneously connected with the first dual power supply and opens Close QF8-1Double end side the second end and the second twin-power switch QF8-2Double end side the second end;15th circuit breaker Q F15One end connects the Two twin-power switch QF8-2Single head side, the other end connects the second two-way inverter input terminal in electrical network, the second twin-power switch QF8-2Single head side connect the charger input in electrical network;16th circuit breaker Q F16One end connects the charger in electrical network Output, the other end connects first paragraph transformer station 220V/DC bus, the 17th circuit breaker Q F17One end connects in electrical network the One station battery, the other end connects first paragraph transformer station 220V/DC bus, the 18th circuit breaker Q F18One end connects electrical network The second interior two-way inverter, the other end connects second segment transformer station 220V/DC bus, the 19th circuit breaker Q F19One end is even The second station battery getting access to grid interior, the other end connects second segment transformer station 220V/DC bus;20th circuit breaker Q F20 One end connects first paragraph transformer station 220V/DC bus, other end docking station direct current feeder line, the 21st circuit breaker Q F21 One end connects first paragraph transformer station 220V/DC bus, other end docking station direct current feeder line, the 22nd circuit breaker Q F22 One end connects first paragraph transformer station 220V/DC bus, other end docking station direct current feeder line, the 23rd circuit breaker Q F23 One end connects second segment transformer station 220V/DC bus, other end docking station direct current feeder line, the 24th circuit breaker Q F24 One end connects second segment transformer station 220V/DC bus, other end docking station direct current feeder line, the 25th circuit breaker Q F25 One end connects second segment transformer station 220V/DC bus, other end docking station direct current feeder line;26th circuit breaker Q FDOne End connects first paragraph transformer station 220V/DC bus, and the other end connects second segment transformer station 220V/DC bus;
In the embodiment of the present invention, the first circuit breaker Q F1Current transformer output, the second circuit breaker Q F2Current transformer Output, the 3rd circuit breaker Q F3Current transformer output, the 4th circuit breaker Q F4Current transformer output, the 5th Circuit breaker Q F5Current transformer output, the 6th circuit breaker Q F6Current transformer output, the 7th circuit breaker Q F7's Current transformer output, the 8th circuit breaker Q F8Current transformer output, the 9th circuit breaker Q F9Current transformer defeated Go out end, the tenth circuit breaker Q F10Current transformer output, the 11st circuit breaker Q F11Current transformer output, The current transformer output of 12 circuit breaker Q F12, the 13rd circuit breaker Q F13Current transformer output, the 14th break Road device QF14Current transformer output, the 15th circuit breaker Q F15Current transformer output, the 16th circuit breaker Q F16 Current transformer output, the 17th circuit breaker Q F17Current transformer output, the 18th circuit breaker Q F18Electric current Transformer output, the 19th circuit breaker Q F19Current transformer output, the 20th circuit breaker Q F20Current transformer Output, the 21st circuit breaker Q F21Current transformer output, the 22nd circuit breaker Q F22Current transformer defeated Go out end, the 23rd circuit breaker Q F23Current transformer output, the 24th circuit breaker Q F24Current transformer output End, the 25th circuit breaker Q F25Current transformer output and the 26th circuit breaker Q FDCurrent transformer output equal Controller is connected by bus;
Station local coordinate frame output circuit breaker Q F in the embodiment of the present invention, in electrical networkGCurrent transformer output and standby change Depressor output circuit breaker Q FBCurrent transformer output connect controller by bus;The output of controller passes through bus Connect the control end of each breaker respectively;First twin-power switch QF8-1Current transformer output and the second twin-power switch QF8-2Current transformer output connect controller also by bus.
Realize the control method of transformer station's micro-grid system containing distributed power source, method flow diagram as shown in Figure 4, including following Step:
Step 1, employing controller control the 11st circuit breaker Q F11, the 14th circuit breaker Q F14Break with spare transformer output Road device QFBIt is in a point position state, controls the first twin-power switch QF8-1With the second twin-power switch QF8-2Plug-in strip be in main transformer End, and control other breakers and be in "on" position, make system enter main transformer duty;
In the embodiment of the present invention, stand and there are two kinds of typical operational modes with micro-capacitance sensor: under normal circumstances, stand with micro-capacitance sensor with often Rule electrical network is incorporated into the power networks (networked mode);When detecting that electric network fault or the quality of power supply are unsatisfactory for requiring, stand with micro-capacitance sensor will and Time and electrical network disconnect and independent operating (island mode);Difference according to station micro-grid operation mode takes different control strategies, Under networked mode, distributed power source uses PQ to control (active reactive control), uses V/f to control (electric voltage frequency during island mode Control).
In the embodiment of the present invention, during main transformer duty, microgrid 380V/AC bus is with transformer station's 380V/AC bus also Connection, first microgrid battery and station battery section are charged by photovoltaic panel, and after energy storage reaches required value, (one is total The 85% of capacity), to the station load on transformer station's 380V/AC bus and the load supplying on the dc bus of station, preferentially make Power with clean energy resource, it is ensured that the maximal efficiency output of solar electrical energy generation and maximal efficiency use, and photovoltaic generation insufficient section is by becoming Power station 380V/AC bus supplements.
Step 2, employing the 3rd transformer CT3The current value of Real-time Collection microgrid battery input, it is judged that the electricity collected Whether flow valuve reaches the 85% of total capacity, the most then controller controls the 4th circuit breaker Q F4It is in a point position state;Otherwise, continue Continuous Real-time Collection;
Use the 17th circuit breaker Q F17The current transformer Real-time Collection first stop current value of battery input, it is judged that institute Whether the current value collected reaches the 85% of total capacity, the most then controller controls the 17th circuit breaker Q F17It is in a point position shape State;Otherwise, Real-time Collection is continued;
Use the 19th circuit breaker Q F19The current transformer Real-time Collection second station current value of battery input, it is judged that institute Whether the current value collected reaches the 85% of total capacity, the most then controller controls the 19th circuit breaker Q F19It is in a point position shape State;Otherwise, Real-time Collection is continued;
Step 3, when station local coordinate frame output circuit breaker Q FGDetecting when the change of 35KV station is broken down, controller sends letter Number to station local coordinate frame output circuit breaker Q FG, the first circuit breaker Q F1, the 7th circuit breaker Q F7, the 8th circuit breaker Q F8, Nine circuit breaker Q F9With the tenth circuit breaker Q F10So that it is it is in a point position state, controls spare transformer output circuit breaker Q FB、 11st circuit breaker Q F11With the 14th circuit breaker Q F14It is in "on" position, and controls the first twin-power switch QF8-1With second Twin-power switch QF8-2Plug-in strip be in standby change end, make system enter spare transformer duty;
In the embodiment of the present invention, when station local coordinate frame output circuit breaker Q FGDetect when the change of 35KV station is broken down, from Dynamic input station spare transformer, QFGDisconnect, QF14Guan Bi, QF11Guan Bi, QF8-1M invested by double-throw switch2Side, direct current is female Connection cabinet switch QFDGuan Bi, spare transformer is passed through two-way inverter to second segment transformer station by standby change 380V/AC bus 220V/DC busbar charging.
Step 4, when station spare transformer output circuit breaker Q FBCurrent transformer detect when current value sports 0, then control Make the 5th circuit breaker Q F5, the 11st circuit breaker Q F11With the 14th circuit breaker Q F14It is in a point position state, controls the 26th and break Road device QFDClose a floodgate, and control the first twin-power switch QF8-1Disconnection, the second twin-power switch QF8-2Plug-in strip access main transformer end, System is made to enter microgrid duty;
In the embodiment of the present invention, when primary, spare power supply all breaks down, QFG、QF14Disconnect, QF8-2Double-throw switch is invested M1Side (main transformer end), photovoltaic panel powered to station DC load by the second two-way inverter by microgrid 380V/AC bus, and one Individual photovoltaic array runs to provide reference voltage and frequency in the way of main website, and other photovoltaic arrays operate in PQ in the way of slave station Pattern provides firm power.
Preferential important load (communication, monitoring and lighting apparatus) power supply on microgrid 380V/AC bus.
Step 5, when system enter microgrid duty time, set the priority of DC load according to the actual requirements, according to preferentially Level, disconnects the breaker corresponding to DC load that priority is low;
In the embodiment of the present invention, according to priority, disconnect the breaker corresponding to DC load that priority is low, the open circuit of disconnection Device number sets according to the actual requirements, and communication, monitoring and lighting apparatus priority are the highest.
Step 6, use the first transformer CT1The current value of Real-time Collection metope photovoltaic panel output, uses the second transformer CT2 The current value of Real-time Collection roof photovoltaic panel output, if the current value gathered is more than 0, then system worked well, if the electricity gathered Flow valuve is equal to 0, then control the second circuit breaker Q F2With the 3rd circuit breaker Q F3It is in a point position state, and controls the 4th circuit breaker Q F4、 17th circuit breaker Q F17With the 19th circuit breaker Q F19It is in "on" position;
In the embodiment of the present invention, when night or unglazed in the case of, disconnect exchange mother QF1, QF8-1Double-throw switch is thrown to middle, QF8-2M invested by double-throw switch1Side, prevents the alternating current direct provided through two-way inverter by station battery from connecting QF8-1 Double-throw switch flows back to charger, can be to DC load and important load (communication, monitoring by microgrid battery and station battery And lighting apparatus) power supply.
The most primary, spare power supply status and double-throw switch position are as shown in the table:
Table 1
Step 7, when system resumes power, by station local coordinate frame output circuit breaker Q FGDetect its both end voltage difference, if Voltage difference is 0, then keep constant, and otherwise, then the output voltage phase place of each inverter in adjustment electrical network, makes microgrid 380V/AC Busbar voltage frequency is identical with transformer station 380V/AC busbar voltage frequency and phase place with phase place, or in allowed limits, i.e. presses Difference is 10%, and frequency difference is 0.3Hz, and controls QFG、QF1、QF7、QF8、QF9、QF10It is in "on" position, QFDPlace In a point position state, control the first twin-power switch disconnecting link and be positioned at main transformer end, station DC load is all put into;Described permission Scope set according to the actual requirements.
In the embodiment of the present invention, stand, with micro-capacitance sensor, there is self-healing function, when system resumes power, pass through QFGDetect this open circuit Device both end voltage frequency plot is poor, automatically adjusts the voltage-phase of each inverter of micro-grid system, makes microgrid 380V/AC busbar voltage Frequency is identical with transformer station 380V/AC busbar voltage frequency and phase place with phase place, or in allowed limits, micro-grid system is by orphan Island running status transfers the state of being incorporated into the power networks to.
In the embodiment of the present invention, realize the real-time detection to electric network data by display, specific as follows:
Main interface: after system starts, show main interface;In the embodiment of the present invention, the menu control under VC environment is utilized to lead The function menu of monitoring system is added at interface, has main runnable interface, serial port setting, inverter data, historical data, parameter to set The menu item such as put.
State runnable interface: show history gross generation, accumulative generating dutation, daily generation, cigarette in the main runnable interface of system The data such as the CERs such as dirt, instantaneous power real-time curve.
Human-computer interaction interface: design is suitable for the interactive interface of customer requirement;Standard graphic element storehouse, conveniently calls combination;Real time data Gather and display;The automatic logical calculated of data message and process;Device parameter remotely changes setting;Splitting or integrating lock state shows Etc. function.
Curve and Report Server Management are arranged: the trend curve of the electric parameter of customer requirement;The historical trend of power consumption;Design meets visitor The various forms of family demand;Automatically generate the day of electric energy metrical, the moon, year form;Template can be set according to conventional MSExcel And generate corresponding report, make user easily use;Inquire about any time form, show and print.
Background database manager: widely used database software such as MSSQL, SQLServer etc.;Set up open, network Change database;The time limit or all of data message are specified in storage;C/S, B/S mode of support remotely accesses, it is achieved data remote.
Communication management is arranged: data acquisition unit each serial ports autonomous configuration, easy to operate;The communications protocol of distinct device, communication ripple Special rate is from main separation;System is automatically connected each equipment to this data acquisition unit corresponding port according to selection result and is carried out unified remote control Configuration.

Claims (5)

1. the transformer station's micro-grid system containing distributed power source, it is characterised in that include the first transformer, the second transformer, 3rd transformer, the first breaker, the second breaker, the 3rd breaker, the 4th breaker, the 5th breaker, the 6th open circuit Device, the 7th breaker, the 8th breaker, the 9th breaker, the tenth breaker, the 11st breaker, the 12nd breaker, 13rd breaker, the 14th breaker, the 15th breaker, the 16th breaker, the 17th breaker, the 18th open circuit Device, the 19th breaker, the 20th breaker, the 21st breaker, the 22nd breaker, the 23rd breaker, 24th breaker, the 25th breaker, the 26th breaker, the first twin-power switch, the second twin-power switch, Controller and display, wherein,
Between metope photovoltaic panel and the first combining inverter that the first described transformer is arranged in electrical network, the second transformer is arranged Between roof photovoltaic panel and the second combining inverter in electrical network, the microgrid battery and that the 3rd transformer is arranged in electrical network Between one two-way inverter, the first transformer output, the second transformer output and the 3rd transformer output are by bus even Connect the input of controller;
First described breaker one end connects microgrid 380V/AC bus, and the other end connects transformer station's 380V/AC bus;The Two breaker one end connect the first combining inverter, and the other end connects microgrid 380V/AC bus;3rd breaker one end connects Second combining inverter, the other end connects microgrid 380V/AC bus;4th breaker one end connects the first two-way inverter, The other end connects microgrid 380V/AC bus;5th breaker one end connects microgrid 380V/AC bus, and the other end connects first One end of twin-power switch double end side;6th breaker one end connects microgrid 380V/AC bus, and the other end connects second pair of electricity One end of source switch double end side;7th breaker one end connects transformer station's 380V/AC bus, other end docking station alternating current Feeder line, the 8th breaker one end connects transformer station's 380V/AC bus, other end docking station alternating current feeder line, the 9th open circuit Device one end connects transformer station's 380V/AC bus, other end docking station alternating current feeder line, and the tenth breaker one end connects power transformation Stand 380V/AC bus, other end docking station alternating current feeder line;It is female that 11st breaker one end connects microgrid 380V/AC Line, the other end connects standby change 380V/AC bus, and the 12nd breaker one end connects microgrid 380V/AC bus, the other end Connecting communication, monitoring or lighting apparatus, the 13rd breaker one end connects microgrid 380V/AC bus, and the other end connects logical News, monitoring or lighting apparatus;One end of 14th breaker connects standby change 380V/AC bus, and the other end is simultaneously connected with the One twin-power switch double end side the second end and second twin-power switch double end side the second end;15th breaker one end connects second pair The single head side of power switch, the other end connects the second two-way inverter input terminal in electrical network, the single head side of the second twin-power switch Connect the charger input in electrical network;16th breaker one end connects the output of the charger in electrical network, and the other end connects First paragraph transformer station 220V/DC bus, the 17th breaker one end connects the first stop battery in electrical network, and the other end is even Connecing first paragraph transformer station 220V/DC bus, the 18th breaker one end connects the second two-way inverter in electrical network, the other end Connecting second segment transformer station 220V/DC bus, the 19th breaker one end connects the second station battery in electrical network, another End connects second segment transformer station 220V/DC bus;20th breaker one end connects first paragraph transformer station 220V/DC bus, Other end docking station direct current feeder line, the 21st breaker one end connects first paragraph transformer station 220V/DC bus, another End docking station direct current feeder line, the 22nd breaker one end connects first paragraph transformer station 220V/DC bus, and the other end is even Going to the station to meet somebody and use direct current feeder line, the 23rd breaker one end connects second segment transformer station 220V/DC bus, other end docking station Using direct current feeder line, the 24th breaker one end to connect second segment transformer station 220V/DC bus, other end docking station is with straight Stream electricity feeder line, the 25th breaker one end connects second segment transformer station 220V/DC bus, other end docking station direct current Feeder line;26th breaker one end connects first paragraph transformer station 220V/DC bus, and the other end connects second segment transformer station 220V/DC bus;
The current transformer output of the first described breaker, the current transformer output of the second breaker, the 3rd breaker Current transformer output, the current transformer output of the 4th breaker, the current transformer output of the 5th breaker, The current transformer output of the 6th breaker, the current transformer output of the 7th breaker, the Current Mutual Inductance of the 8th breaker Device output, the current transformer output of the 9th breaker, the current transformer output of the tenth breaker, the 11st open circuit The current transformer output of device, the current transformer output of the 12nd breaker, the 13rd breaker current transformer defeated Go out end, the current transformer output of the 14th breaker, the current transformer output of the 15th breaker, the 16th open circuit The current transformer output of device, the current transformer output of the 17th breaker, the 18th breaker current transformer defeated Go out end, the current transformer output of the 19th breaker, the current transformer output of the 20th breaker, the 21st break The current transformer output of road device, the current transformer output of the 22nd breaker, the 23rd breaker electric current mutual Sensor output, the current transformer output of the 24th breaker, the current transformer output of the 25th breaker and The current transformer output of the 26th breaker all connects controller by bus;
The current transformer output of the station local coordinate frame output breaker in electrical network and the electricity of spare transformer output breaker Current transformer output connects controller by bus;
The output of controller connects the control end of each breaker respectively by bus;
The output of controller connects the input of display.
Transformer station's micro-grid system containing distributed power source the most according to claim 1, it is characterised in that described first pair The current transformer output of power switch and the current transformer output of the second twin-power switch connect control also by bus Device.
3. realize the control method of the transformer station's micro-grid system containing distributed power source described in claim 1, it is characterised in that bag Include following steps:
Step 1, employing controller control the 11st breaker, the 14th breaker and spare transformer output breaker and are in Dividing position state, the plug-in strip controlling the first twin-power switch and the second twin-power switch is in main transformer end, and it is equal to control other breakers It is in "on" position, makes system enter main transformer duty;
Step 2, the current value of employing the 3rd transformer Real-time Collection microgrid battery input, it is judged that the current value collected Whether reach setting value, the most then controller control the 4th breaker is in a point position state;Otherwise, Real-time Collection is continued;
Use the current value of the current transformer Real-time Collection first stop battery input of the 17th breaker, it is judged that gathered To current value whether reach setting value, the most then controller control the 17th breaker be in a point position state;Otherwise, continue Real-time Collection;
Use the current value of the current transformer Real-time Collection second station battery input of the 19th breaker, it is judged that gathered To current value whether reach setting value, the most then controller control the 19th breaker be in a point position state;Otherwise, continue Real-time Collection;
Step 3, when station local coordinate frame output breaker detects that the change of 35KV station is broken down, controller send signal Disconnected to station local coordinate frame output breaker, the first breaker, the 7th breaker, the 8th breaker, the 9th breaker and the tenth Road device so that it is be in a point position state, controls at spare transformer output breaker, the 11st breaker and the 14th breaker In "on" position, and the plug-in strip controlling the first twin-power switch and the second twin-power switch is in standby change end, makes system enter standby Use transformer duty;
Step 4, when the current transformer of spare transformer output breaker detects that current value sports 0, then control Five breakers, the 11st breaker and the 14th breaker are in a point position state, control the 26th breaker closing, and control First twin-power switch disconnects, the plug-in strip of the second twin-power switch accesses main transformer end, makes system enter microgrid duty;
Step 5, when system enter microgrid duty time, set the priority of DC load according to the actual requirements, according to preferentially Level, disconnects the breaker corresponding to DC load that priority is low;
Step 6, use first transformer Real-time Collection metope photovoltaic panel output current value, use the second transformer Real-time Collection The current value of roof photovoltaic panel output, if the current value gathered is more than 0, then system worked well, if the current value gathered is equal to 0, then control the second breaker and the 3rd breaker is in a point position state, and control the 4th breaker, the 17th breaker and 19 breakers are in "on" position;
Step 7, when the change of 35KV station restores electricity, station local coordinate frame output breaker detect its both end voltage poor Value, if voltage difference is 0, then keeps constant, and otherwise, then the output voltage phase place of each combining inverter in adjustment electrical network, makes Microgrid 380V/AC busbar voltage frequency is identical with transformer station 380V/AC busbar voltage frequency and phase place with phase place, or is allowing In the range of, and control station local coordinate frame output breaker, the first breaker, the 7th breaker, the 8th breaker, the 9th Breaker and the tenth breaker are in "on" position, and the 26th breaker is in a point position state, control the first twin-power switch cutter Lock is positioned at main transformer end, is all put into by station DC load.
Control method the most according to claim 3, it is characterised in that described in step 5 according to priority, disconnect priority The low breaker corresponding to DC load, the breaker number of disconnection sets according to the actual requirements, and communication, monitors and shine The priority of bright equipment is the highest.
Control method the most according to claim 3, it is characterised in that the scope of the permission described in step 7 is according to the actual requirements Set.
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