CN103852663A - Energy feedback type distributed photovoltaic power inverter integrated test system - Google Patents

Energy feedback type distributed photovoltaic power inverter integrated test system Download PDF

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Publication number
CN103852663A
CN103852663A CN201310338552.9A CN201310338552A CN103852663A CN 103852663 A CN103852663 A CN 103852663A CN 201310338552 A CN201310338552 A CN 201310338552A CN 103852663 A CN103852663 A CN 103852663A
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China
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phase
power
current source
test
inverter
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CN201310338552.9A
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Inventor
范瑞祥
周细文
肖红霞
邓才波
徐在德
潘本仁
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JIANGSU UONONE NEW ENERGY Co Ltd
State Grid Corp of China SGCC
Electric Power Research Institute of State Grid Jiangxi Electric Power Co Ltd
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JIANGSU UONONE NEW ENERGY Co Ltd
State Grid Corp of China SGCC
Electric Power Research Institute of State Grid Jiangxi Electric Power Co Ltd
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Priority to CN201310338552.9A priority Critical patent/CN103852663A/en
Publication of CN103852663A publication Critical patent/CN103852663A/en
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Abstract

Provided is an energy feedback type distributed photovoltaic power inverter integrated test system. The energy feedback type distributed photovoltaic power inverter integrated test system comprises a power electronic island and stimulated power grid alternating-current source, a wave recorder, a power analyzer and a client notebook computer, wherein the power electronic island and stimulated power grid alternating-current source is composed of a hardware system and two independent control systems, provides a power electronic island load simulation device for the energy feedback type distributed photovoltaic power inverter integrated test system, is equivalent to an RLC load, is used for replacing the traditional RLC load, can serve as an alternating-current source stimulated power grid, and have both the island testing function and the power grid characteristic simulation function. According to a built island detection and power grid simulation integrated device, energy feedback is achieved, energy consumption during a test is reduced, the size and the weight of the island detection and power grid simulation integrated device are reduced, the site test capacity is achieved, active power and reactive power output by a photovoltaic inverter can be detected in real time, the load resistance needing to be simulated, the load inductance needing to be simulated and the load capacitance needing to be simulated are calculated in real time, and the island detection test can be carried out on the photovoltaic power grid-connection site.

Description

A kind of energy feedback type distributed photovoltaic power inverter integrated test system
Technical field
The present invention relates to a kind of energy feedback type distributed photovoltaic power inverter integrated test system that integrates isolated island test and electrical network simulated behavior, belong to power test technical field.
Background technology
Taking photovoltaic as main distributed generation system, after public electric wire net decompression, if electricity generation system can not detect, be still fed to electric weight near load and will form " isolated island ".The isolated island of unplanned property may endanger electric power overhaul personnel's life security, affects the correct operation of electric power protection switch, and can cause damage to relevant power equipment.So present international standard and domestic standard all require combining inverter must have the function that anti-isolated island detects, and have also proposed relevant experimental technique simultaneously.
The experimental provision detecting for isolated island is at present mainly to adopt adjustable RLC simulation in parallel island load.Resistance, the electric capacity even load size of this load simulating device adopt mechanical type adjustment, need the combination of a lot of components and parts, mainly have the problem of the following aspects:
1) price is high.Existing conventional equipment is requiring very highly to element aspect parametric stability, can not have parasitic parameter, consider the change in resistance that causes after last trading day heating, therefore can not select conventional more cheap resistance/sense/capacitive element, causes overall price higher.
2) reliability and serviceable life aspect all there is some problems.Owing to adopting RLC array mode, need to adopt switching mode fictitious load to change, in experimentation, switching frequency is many, has reduced whole service life and the reliability of device.
3) consume a large amount of electric energy, economy is not high.The active power of unit simulation load need be passed through resistance consumption completely, while carrying out the anti-isolated island test of inverter by standard, conventionally need to simulate 45 kinds of operating modes, every kind of operating mode is linked into experiment from ohmic load and finishes at least to need certain test duration, so can consume a large amount of electric energy in the time carrying out test experience, and uneconomical.If in the debug phase in early stage of equipment, experiment not smoothly its loss power will be multiplied, consume energy even more serious.
4) volume and weight are bigger than normal, are difficult to be designed to wheeled apparatus and realize on-the-spot test application.
Consider developing rapidly of distributed power source, for the demand of anti-island protect on-the-spot test and reduction test energy consumption, for the problem existing in existing RLC type proving installation, be necessary to adopt a kind of novel island load analogue means of electronic power switch technical design completely, it can absorb or send active power and reactive power, simulate and replace RLC shunt load, can also, by the energy-feedback power grid of gaining merit, reduce in a large number the energy loss in experimentation; And owing to having abandoned the adjustment of load of mechanical system, improve the serviceable life of experimental facilities, can reduce the maintenance cost of experimental facilities; Aspect volume and weight, also will have obvious advantage in addition.
Summary of the invention
The object of the invention is, the problem existing in order to solve the experimental provision of isolated island detection, the present invention discloses a kind of energy feedback type distributed photovoltaic power inverter integrated test system that integrates isolated island test and electrical network simulated behavior.
Technical scheme of the present invention is, required AC analogue power supply and isolated island proving installation in the test of distributed electrical source grid-connected inverter united two into one, form the new energy feedback type distributed photovoltaic power inverter integrated test system that integrates isolated island test and electrical network simulated behavior.
Energy feedback type distributed photovoltaic power inverter integrated test system of the present invention is made up of power electronics isolated island and simulating grid alternating current source, data acquisition system (DAS), client.
Data acquisition system (DAS) is made up of power analyzer and oscillograph.Power analyzer is measured three-phase voltage and the three-phase current signal of photovoltaic DC-to-AC converter outgoing side, carries out data analysis and process, obtains the electrical quantitys such as active power, reactive power, applied power, power factor, electric voltage frequency.The three-phase voltage of oscillograph high speed acquisition photovoltaic DC-to-AC converter outgoing side and the raw data of three-phase current signal.Power analyzer and oscillograph can transfer data on notebook by ethernet communication mode.
Power electronics isolated island and simulating grid alternating current source adopt IGBT switching technique to build three-phase H bridge inverter, AC connects LC wave filter, direct current is powered by controlled rectifier, for integrated test system provides a power electronics island load analogue means, be used for substituting traditional RLC load with RLC load equivalent, can be used as alternating current source simulating grid simultaneously, there is isolated island test and electrical network simulated behavior dual-use function.
Client notebook computer is by the data of the real-time reading out data acquisition system of Fast Ethernet communication modes, form with numerical value or curve shows, by Mudbus/CAN agreement and inverter communication, control AC electrical network simulator and complete the detection to photovoltaic DC-to-AC converter.
Power electronics isolated island and simulating grid alternating current source (abbreviation alternating current source) overlap independently composition of the control system by a set of hardware system and two, can select required function by the man-machine interface of the machine, the man-machine interface of the machine leaves the RS422 interface with Background communication.
The main circuit of power electronics isolated island and simulating grid alternating current source forms 3 H bridge inverters, 3 single-phase LC wave filters, 3 single transformers and bypass contactor KM2 and forms by inputting circuit breaker Q F1, output circuit breaker Q F2, contactor KM1, AC reactor L, controlled rectifier, 12 IGBT.The three-phase supply of input enters respectively main circuit and bypass by input circuit breaker Q F1; Main circuit connects AC reactor L by contactor KM1, meet again the interchange end AC of controlled rectifier by AC reactor L, export to by 12 IGBT and form 3 H bridge inverters by the DC terminal DC of controlled rectifier, interchange output after inversion connects three single transformers by three single-phase LC wave filters, after transformer, secondary adopts star connection, draw A1, B1, C1 three-phase terminal, reserved N1 terminal.Bypass connects A1, B1, C1 three-phase terminal and zero line N1 terminal by contactor KM2.
Alternating current source of the present invention is input as and exchanges 400V50Hz, and the direct supply of H bridge provides after by controllable rectifier bridge rectification.
After alternating current source inversion of the present invention, adopt three independent H bridges and LC wave filter, single transformer, make not have coupling between three-phase, every phase voltage, electric current can regulate separately, can simulate unbalance load; Every three level of can exporting mutually after employing H bridge, improve equivalent switching frequency, reduce output harmonic wave.Energy can pass through controlled rectifier feedback grid.
The control system of power electronics isolated island of the present invention and simulating grid alternating current source detects voltage and the 3 phase H bridge inverter output currents of AC bus in real time, mathematical model by resistance, inductance, electric capacity calculate the meritorious and reactive current that three phase inverter bridge need to be exported, and produce according to this switching signal of IGBT, the work of control inverter bridge, realizes the equivalence with RLC load.
Power electronics isolated island and simulating grid alternating current source control system master chip are made up of DSP6747, DSP28335 and two FPGA.DSP28335 chip, for upper layer logic controls such as external communication connection and digital quantity input and output, has CAN, 485,422 communication interfaces such as grade.DSP6747 chip is responsible for the core algorithm computings such as inverter, and device dominant frequency is 300MHZ, the highest simultaneously 8 multiplication concurrent operations, and arithmetic speed is approximately than 28335 fast 4 times.
Described control system inside comprises 64MB SDRAM, 4G FLASH, and this can realize extensive program operation, and can real time record runtime data waveform 20Min.
Described Control system simulation is inputted 16 tunnels, 14 sampling rate 25K of precision, output optical fibre 16 tunnels, can drive simultaneously 8 road and bridge arm.Described controller externally also has 4 tunnel optical-fibre communications can realize multiple controller parallel runnings.
Power electronics isolated island of the present invention and simulating grid alternating current source are to the control flow of RLC load simulation as shown in Figure 3.
RLC load simulation is by three-phase voltage U a on Gather and input ac bus, Ub, and Uc, calculates amplitude and the frequency of voltage, calculates in real time meritorious instruction and idle instruction P according to the RLC load parameter that needs simulation *and Q *, calculate and need output voltage size and frequency to produce the work of three H bridges of 12 tunnel pulse controls through pulse generate module by PI accommodometer.The output power of inverter with whose alternating voltage and RLC parameter changes and changes, and on fundamental frequency, response is consistent with true RLC load.
Meritorious command calculations:
Idle command calculations: Q * = U 2 2 πfc - U 2 2 πfL ;
Feedback is meritorious to be calculated: P=u αi α+ u βi β
Feed back idle calculating: Q=u αi β-u αi β
Meritorious instruction and feedback are meritorious regulates rear output voltage amplitude V by PI, and realizing gains merit relatively regulates.
Idle instruction is idle by PI with feedback, then after PD regulates output voltage frequency f; Voltage magnitude and frequency generate sinusoidal waveform and triangle wave output driving pulse control IGBT work, realize idle relatively adjusting.
Power electronics isolated island of the present invention and simulating grid alternating current source are a kind of high performance Multifunctional power grid simulators, not only can export normal line voltage, and can simulate such as voltage fall, the common electrical network phenomenon such as frequency shift (FS), three-phase imbalance and voltage distortion.
Simulate normal line voltage, output three-phase symmetrical, there is the sinusoidal voltage of specified amplitude and frequency; Simulating grid voltage falls and variation in voltage function.
The output voltage of simulation can fall at any time and recover, and falls the degree of depth and duration and can, according to test request free setting, fall for imbalance, the falling the degree of depth and can set arbitrarily of each phase.
Simulating grid electric voltage frequency offset power, can realize the Catastrophe and evolution of electric voltage frequency.For frequency discontinuity, require at any time for the gradual change situation of frequency, the gradual change time can establish, and the duration after frequency change can free setting.
The function of simulating grid voltage three-phase imbalance.Simulation answers output packet to contain the voltage of negative sequence component, and wherein negative sequence component and zero-sequence component can free settings.
The function that simulating grid voltage comprises harmonic wave.Simulate exportable stack harmonic wave on first-harmonic basis and the voltage waveform of a harmonic wave.Phase place between number of times, harmonic amplitude, harmonic wave and the first-harmonic of stack harmonic wave can need to set according to test, and the multiple harmonic that can simultaneously superpose.
The control system of power electronics isolated island of the present invention and simulating grid alternating current source can automatically switch to simulating grid alternating current source and island load: while carrying out isolated island test experience in photovoltaic DC-to-AC converter erecting stage, equipment is first as alternating current source operation, the voltage magnitude of stable output and frequency; Checkout equipment input in real time is simultaneously meritorious and idle, according to meritorious and idle, and the quality factor q f needing, calculate in real time the pull-up resistor that needs simulation, load inductance L, load capacitance C.Because on-the-spot photovoltaic combining inverter output power is along with the factors such as illumination change, thus R, L, the numerical value of C is also followed variation.Receiving after island mode designated command, R is calculated in control system utilization in real time, L, and it is idle that C calculation of parameter needs, the meritorious voltage that needs output that calculates by PI accommodometer.Can meet the isolated island test experience of load matched in experimental standard and other requirement.And adopting traditional mechanical type RLC load device, the power that cannot dynamically follow the tracks of photovoltaic DC-to-AC converter changes, and also just cannot carry out at the scene isolated island test experience.
The invention has the beneficial effects as follows, a kind of energy feedback type distributed photovoltaic power inverter integrated test system that integrates isolated island test and electrical network simulated behavior of the present invention, can absorb or send active power and reactive power, simulate and replace RLC shunt load, realize isolated island test and electrical network simulated behavior; Can also, by the energy-feedback power grid of gaining merit, reduce in a large number the energy loss in experimentation.Due to the serviceable life of having abandoned the adjustment of load of mechanical system and having improved experimental facilities, reduce the maintenance cost of experimental facilities; Aspect volume and weight, also there is obvious advantage.
The isolated island device that simultaneously adopts electronic power switch technology due to the present invention, can carry out at photovoltaic plant scene isolated island test experience.Traditional isolated island test experience, need to be by regulating several times, and require the grid-connected power stability of photovoltaic combining inverter, and this cannot complete the isolated island test experience under various load parameters by standard while causing real power fluctuation at the scene.And the isolated island device of employing Power Electronic Technique, and adopted technique of real-time control, can detect in real time the meritorious and idle of photovoltaic DC-to-AC converter output and calculate in real time the pull-up resistor that need to simulate, inductance, electric capacity.Receiving after island load startup command, with the load parameter value calculating at the last moment, as island load parameter, under the various operating modes such as the load matched that so just can require according to experimental standard, carrying out isolated island test experience.
The present invention is applicable to the on-the-spot test of power electronics isolated island.
Brief description of the drawings
Fig. 1 is energy feedback type distributed photovoltaic power inverter integrated test system test schematic diagram of the present invention;
Fig. 2 is power electronics isolated island and simulating grid alternating current source main circuit topological structure figure;
Fig. 3 is power electronics isolated island and simulating grid alternating current source control flow chart;
Fig. 4 is power electronics isolated island and simulating grid alternating current source control system hardware structure diagram;
Fig. 5 is power electronics isolated island test experience schematic diagram.
Embodiment
The specific embodiment of the present invention as shown in drawings.
Embodiment of the present invention energy feedback type distributed photovoltaic power inverter integrated test system as shown in Figure 1.Integrated test system is made up of power electronics isolated island and simulating grid alternating current source, data acquisition system (DAS) and client.Data acquisition system (DAS) comprises power analyzer and oscillograph, power analyzer is measured three-phase voltage and the three-phase current signal of photovoltaic DC-to-AC converter outgoing side, carry out data analysis and process, obtain the electrical quantitys such as active power, reactive power, applied power, power factor, electric voltage frequency.The three-phase voltage of oscillograph high speed acquisition photovoltaic DC-to-AC converter outgoing side and the raw data of three-phase current signal.
The main circuit of embodiment of the present invention power electronics isolated island and simulating grid alternating current source (abbreviation alternating current source) as shown in Figure 2.Alternating current source main circuit forms 3 H bridge inverters, 3 single-phase LC wave filters, 3 single transformers and bypass contactor KM2 and forms by inputting circuit breaker Q F1, output circuit breaker Q F2, contactor KM1, AC reactor L, controlled rectifier, 12 IGBT (insulated gate bipolar transistor).The three-phase supply of input enters respectively main circuit and bypass by input circuit breaker Q F1; Main circuit connects AC reactor L by contactor KM1, meet again the interchange end AC of controlled rectifier by AC reactor L, export to by 12 IGBT and form 3 H bridge inverters by the DC terminal DC of controlled rectifier, interchange output after inversion connects three single transformers by three single-phase LC wave filters, after transformer, secondary adopts star connection, draw A1, B1, C1 three-phase terminal, reserved N1 terminal.
The present embodiment alternating current source main circuit adopts 1200V grade to IGBT, the highlyest allows 150 DEG C of junction temperatures; DC bus rated voltage 620V; Rectification side capacity is 60kW, and inversion outgoing side capacity is 75kVA; Transformer voltage ratio is 345V:220V, capacity 3*25kVA, 1.3 times of overvoltages; A1B1C1 AC three-phase output ceiling voltage is 480V, specified 380V, rated current 113.6A; Every phase H bridge output ceiling voltage 430V.
The present embodiment is in the selection of element, and DC support electric capacity is selected import metal mode electric capacity, lower than electrochemical capacitor loss; Exceeding 15 years serviceable life, is the more than 3 times of electrochemical capacitor; The coupling part of module DC capacitor and IGBT adopts low sense stack bus bar (busbar), busbar inductance extremely low (being less than 20nH), good insulation preformance, in the application scenario of high switching frequency, large di/dt, can greatly reduce the switch superpotential of IGBT, the reliability that improves product is high.
The present embodiment 3 phase H bridge inverter rated capacity 75kVA, in rated capacity, the output of inverter bridge is meritorious can be regulated arbitrarily with reactive current, and meritorious energy can feed back to DC side.
The circuit that power electronics isolated island in the present embodiment energy feedback type distributed photovoltaic power inverter integrated test system and simulating grid alternating current source carry out inverter test as simulating grid alternating current source as shown in Figure 5.
This circuit can carry out many tests of standard regulation, and functional test comprises: the specified input and output of inverter, efficiency, automatic switching, soft start, recovery are grid-connected, communication test, cooling system and noise testing etc.; Electric performance test: temperature rise, the quality of power supply, harmonic wave and wave form distortion, power factor, tri-phase unbalance factor and DC component etc.; Electric protection function test: comprised/under-voltage protection (direct current input side overvoltage protection with exchange outgoing side mistake/under-voltage protection), mistake/underfrequency protection, error-polarity connection or phase sequence error protection, direct current input overload protection, counnter attack discharge prevention, the test of anti-isolated island and low voltage crossing test etc.; the low controlled rectification of wearing front end while test can be according to the size of ac input power; dynamically promote the DC voltage of tested inverter; thereby in the situation that there is no cell panel IV simulator, simulate more really the low test of wearing.
In addition, described alternating current source also can carry out the special testing experiment beyond standard, superpose such as the test of electrical network three-phase imbalance, three-phase equilibrium or when uneven harmonic test, three-phase equilibrium or frequency mutant test when uneven, repeatedly low frequency mutant test etc. while superposeing harmonic test, low wearing while wearing test, low wearing.

Claims (8)

1. an energy feedback type distributed photovoltaic power inverter integrated test system, comprise oscillograph, power analyzer, it is characterized in that, described system also comprises power electronics isolated island and simulating grid alternating current source, described alternating current source adopts IGBT switching technique to build three-phase H bridge inverter, AC connects LC wave filter, direct current is powered by controlled rectifier, for integrated test system provides a power electronics island load analogue means and RLC load equivalent for substituting traditional RLC load, can be used as alternating current source simulating grid simultaneously, there is isolated island test and electrical network simulated behavior dual-use function.
2. energy feedback type distributed photovoltaic power inverter integrated test system according to claim 1, it is characterized in that, described power electronics isolated island and simulating grid alternating current source overlap independently composition of the control system by a set of hardware system and two, can select required function by the man-machine interface of the machine, the man-machine interface of the machine leaves the RS422 interface with Background communication;
The main circuit of described hardware system forms 3 H bridge inverters, 3 single-phase LC wave filters, 3 single transformers and bypass contactor KM2 and forms by inputting circuit breaker Q F1, output circuit breaker Q F2, contactor KM1, AC reactor L, controlled rectifier, 12 IGBT; The three-phase supply of input enters respectively main circuit and bypass by input circuit breaker Q F1; Main circuit connects AC reactor L by contactor KM1, meet again the interchange end AC of controlled rectifier by AC reactor L, export H bridge inverter to by the DC terminal DC of controlled rectifier, interchange output after inversion connects three single transformers by three single-phase LC wave filters, after transformer, secondary adopts star connection, draw A1, B1, C1 three-phase terminal, reserved N1 terminal; Bypass connects A1, B1, C1 three-phase terminal and zero line N1 terminal by contactor KM2.
3. energy feedback type distributed photovoltaic power inverter integrated test system according to claim 1, it is characterized in that, described power electronics isolated island and three independent H bridges of simulating grid alternating current source employing and LC wave filter, single transformer, make not exist between three-phase coupling, every phase voltage, electric current can regulate separately, can simulate unbalance load; Every three level of can exporting mutually after employing H bridge, improve equivalent switching frequency, reduce output harmonic wave.
4. energy feedback type distributed photovoltaic power inverter integrated test system according to claim 1, is characterized in that, described power electronics isolated island and simulating grid alternating current source main circuit IGBT adopt 1200V grade, the highlyest allows 150 DEG C of junction temperatures; DC bus rated voltage 620V; Rectification side capacity is 60kW, and inversion outgoing side capacity is 75 kVA; Transformer voltage ratio is 345V:220V, capacity 3*25kVA, 1.3 times of overvoltages; A1B1C1 AC three-phase output ceiling voltage is 480V, specified 380V, rated current 113.6A; Every phase H bridge output ceiling voltage 430V.
5. energy feedback type distributed photovoltaic power inverter integrated test system according to claim 1, it is characterized in that, described 3 phase H bridge inverter rated capacity 75kVA, in rated capacity, the output of inverter bridge is gained merit and can be regulated arbitrarily with reactive current, and meritorious energy can feed back to DC side.
6. energy feedback type distributed photovoltaic power inverter integrated test system according to claim 2, it is characterized in that, the control system of described power electronics isolated island and simulating grid alternating current source detects voltage and the 3 phase H bridge inverter output currents of AC bus in real time, mathematical model by resistance, inductance, electric capacity calculate the meritorious and reactive current that three phase inverter bridge need to be exported, and produce according to this switching signal of IGBT, the work of control inverter bridge, realizes the equivalence with RLC load.
7. energy feedback type distributed photovoltaic power inverter integrated test system according to claim 2, it is characterized in that, described power electronics isolated island and simulating grid alternating current source control system master chip are made up of DSP 6747, DSP 28335 and two FPGA; DSP 28335 chips, for external communication connection and the control of digital quantity input and output upper layer logic, have CAN, 485,422 communication interfaces; DSP 6747 chips are responsible for the computing of inverter core algorithm, and device dominant frequency is 300MHZ, the highest 8 multiplication concurrent operations simultaneously; Described control system inside comprises 64MB SDRAM, 4G FLASH, can realize extensive program operation, and energy real time record runtime data waveform 20Min; Described Control system simulation is inputted 16 tunnels, 14 sampling rate 25K of precision, output optical fibre 16 tunnels, can drive simultaneously 8 road and bridge arm; Described controller externally also has 4 tunnel optical-fibre communications can realize multiple controller parallel runnings.
8. energy feedback type distributed photovoltaic power inverter integrated test system according to claim 1, it is characterized in that, described power electronics isolated island and simulating grid alternating current source are a kind of high performance Multifunctional power grid simulators, not only can export normal line voltage, and can analog voltage fall, the common electrical network phenomenon of frequency shift (FS), three-phase imbalance and voltage distortion.
CN201310338552.9A 2013-08-06 2013-08-06 Energy feedback type distributed photovoltaic power inverter integrated test system Pending CN103852663A (en)

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CN107769247B (en) * 2017-10-19 2020-05-12 中国电力科学研究院有限公司 RLC load simulation system for anti-islanding detection and control method thereof
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Application publication date: 20140611