CN104198853A - Wind power grid integration testing device and testing method - Google Patents
Wind power grid integration testing device and testing method Download PDFInfo
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- CN104198853A CN104198853A CN201410432454.6A CN201410432454A CN104198853A CN 104198853 A CN104198853 A CN 104198853A CN 201410432454 A CN201410432454 A CN 201410432454A CN 104198853 A CN104198853 A CN 104198853A
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Abstract
The invention relates to a wind power grid integration testing device and testing method. The wind power grid integration testing device comprises a three-winding boosting transformer, a rectifier, a time delay closing relay, a flat-wave capacitor, an inverter, a filter, an input circuit breaker, an output circuit breaker, a detection preparing switch, a DSP (Digital Signal Processor) control unit and a computer. The wind power grid integration testing method comprises the steps of: controlling the grid integration testing device to generate a power grid analogue voltage meeting with a power grid adaptability testing requirement by the DSP control unit, and then testing based on relevant power grid adaptability testing regulation of the wind turbine generator. The wind power grid integration testing device and testing method have the advantages of reducing electric energy consumption of a testing device and particularly an LC filtering inductor, speeding up the dynamic response speed of the output voltage of the inverter and enabling the output voltage of the filter to be basically consistent with a voltage set value; the grid integration device adopts normal power electronic devices, is high in integration degree and low in cost; the testing method is intuitional and simple, and can meet with the wind power grid integration testing requirements.
Description
Technical field
The present invention relates to a kind of wind-electricity integration proving installation, and the method for testing of this device is provided, belong to wind-electricity integration technical field, to meet wind-powered electricity generation set grid-connection adaptive testing requirement.
Background technology
Day by day serious along with energy crisis, wind energy is subject to world's extensive concern as a kind of regenerative resource.In recent years, Wind Power Generation Industry develops rapidly, and installed capacity constantly increases, and wind-power electricity generation has become one of indispensable approach of energy source.But usually, because blower fan is to the poor accidents such as blower fan off-grid that cause of grid adaptability, the hysteresis of wind-electricity integration technology seriously restricts the development of China's Wind Power Generation Industry.
In order to promote wind power technology level, ensure fan performance and power grid security, wind-electricity integration measuring technology progressively comes into one's own, China has carried out correlative study and has formulated corresponding standard wind-electricity integration technology, while requiring blower fan grid-connected, carry out the adaptive testings such as voltage, frequency, harmonic wave, voltage fluctuation and flickering, three-phase imbalance, high low voltage crossing, and meet some other interconnection technology requirement.
In recent years, both at home and abroad wind-electricity integration testing research is progressively increased, but its research is mainly for the monitoring field of wind-electricity integration, by specialized equipment, the quality of power supply is monitored, and cuts off fan power in the time producing voltage fluctuation or do not meet grid-connected requirement.The problems such as also have some other grid-connected pick-up unit, as some Multifunctional power grid simulators, photovoltaic combining inverter test macro, but they mostly exist volume large simultaneously, and electric energy loss is many, and dynamic responding speed is slow, the high or complicated operation of cost.
Summary of the invention
The object of the present invention is to provide a kind of wind-electricity integration proving installation and method of testing, this grid-connected pick-up unit is simple to operate, accelerated the dynamic responding speed of inverter output voltage and electric energy loss is reduced.
For solving the problems of the technologies described above, the present invention adopts following technical scheme:
A kind of wind-electricity integration proving installation, comprises three winding step-up transformers, rectifier, time delay closing relay, flat wave capacitor, inverter, wave filter, input isolating switch, output isolating switch and detects and prepare switch, DSP control module and computing machine, the input end of described input isolating switch connects three-phase alternating current electrical network, the output terminal of output isolating switch connects wind generator system, the output terminal of described input isolating switch connects the three former limit of winding step-up transformer winding input ends, the secondary winding output terminal of described three winding step-up transformers connects rectifier input end, described rectifier output end is connected with the input end of flat wave capacitor through time delay closing relay after connecting DC bus again, described flat wave capacitor output terminal connects inverter input terminal, described inverter output end connects filter input end, described filter output connects the former limit of step-down transformer, described step-down transformer secondary connects output isolating switch input end, described detection is prepared switch and is connected across input isolating switch output terminal and output isolating switch input end, described DSP control module connects respectively rectifier output end, inverter control signal input part, inverter and filter output, and described DSP control module is also connected with computing machine.
Preferably, above-mentioned wind-electricity integration proving installation, wherein, described three winding step-up transformers adopt Y/Y/ Δ mode to connect.
Preferably, above-mentioned wind-electricity integration proving installation, wherein, described rectifier adopts 12 pulse rectification mode, is about to two groups of uncontrollable rectifier bridge series connection of three-phase.
Preferably, above-mentioned wind-electricity integration proving installation, wherein, described time delay closing relay is composed in parallel by current-limiting resistance and time closing relay switch.
Preferably, above-mentioned wind-electricity integration proving installation, wherein, described inverter is the voltage source inverter of Sine Pulse Width Modulation control, and described inverter is three-phase three brachium pontis working methods, and described inverter adopts symmetric triangular ripple as carrier wave.
Preferably, above-mentioned wind-electricity integration proving installation, wherein, described wave filter is three-phase Γ type LC wave filter.
Preferably, above-mentioned wind-electricity integration proving installation, wherein, DSP control module adopts TMS320F2812 chip, prepare the break-make of switch for control inputs isolating switch, output isolating switch, test, control inverter, the signals such as output voltage, electric current, phase place, frequency and the harmonic wave of collection rectifier, inverter and wave filter, communicate with host computer simultaneously.
The present invention also provides a kind of method of testing of wind-electricity integration proving installation, uses described wind-electricity integration proving installation, carries out adaptive testing when line voltage exists voltage fluctuation, frequency jitter, imbalance of three-phase voltage, flickering or harmonic wave when grid-connected.
Preferably, the method for testing of described wind-electricity integration proving installation, wherein, it is that grid-connected detection is prepared that switch is prepared in described detection, determines the break-make of actual electric network or simulating grid and blower fan.Computing machine nominative testing project also transmits test command to DSP, and DSP produces corresponding Driven by inverter signal by specified command.Line voltage is exported the desired analog voltage of grid-connected test that computing machine is specified after three winding phase shift step-up transformers, rectification, inversion, step-down, then tests according to wind-powered electricity generation unit grid adaptability test relevant regulations.
Preferably, the method for testing of described wind-electricity integration proving installation, wherein, described DSP, according to given voltage, adopts sliding formwork control to follow the tracks of control to filter output voltage, thereby makes filter output voltage reach fast appointment requirement.
The invention has the advantages that:
1. when test starts, adopt step-up transformer, secondary current is reduced, reduced the especially electric energy loss on LC filter inductance of proving installation;
2. in DSP control module, adopt sliding mode controller to control inverter and filter output voltage simultaneously, accelerated the dynamic responding speed of inverter output voltage, make filter output voltage and voltage setting value basically identical;
3. this grid-connected pick-up unit adopts common power electronic devices, and integrated level is high, and cost is low and method of testing is intuitively simple, can meet wind-electricity integration test request.
Brief description of the drawings
Fig. 1 is the structural drawing for wind-electricity integration proving installation of the specific embodiment of the invention.
Fig. 2 is the Γ type LC filter circuit figure that the present invention adopts.
Fig. 3 is the DSP control module structural drawing of the specific embodiment of the invention.
Fig. 4 is the interrupt service subroutine control signal process flow diagram of the DSP control module of the specific embodiment of the invention.
Fig. 5 is the circuit diagram for wind-electricity integration proving installation of the specific embodiment of the invention.
Fig. 6 is that the DSP of the specific embodiment of the invention is to the sliding formwork control structure figure of filter output voltage.
Embodiment
Below in conjunction with the drawings and specific embodiments, the invention will be further described.
A kind of wind-electricity integration proving installation, as shown in Figure 1, described grid-connected proving installation comprises: switch, DSP control module and computing machine are prepared in three winding step-up transformers, rectifier, time delay closing relay, flat wave capacitor, inverter, wave filter, input isolating switch, output isolating switch and detection.The input end of described proving installation connects three-phase alternating current electrical network, output terminal connects wind generator system, the output terminal of described input isolating switch connects the three former limit of winding step-up transformer winding input ends, the secondary winding output terminal of described three winding step-up transformers connects rectifier input end, described rectifier output end connects DC bus, be connected with flat wave capacitor through time delay closing relay again, described flat wave capacitor output terminal connects inverter input terminal, described inverter output end connects filter input end, described filter output connects the former limit of step-down transformer, described step-down transformer secondary connects output isolating switch input end, described output isolating switch output terminal connects wind power system, described detection is prepared switch and is connected across input isolating switch output terminal and output isolating switch input end, described DSP control module connects respectively rectifier output end, inverter control signal input part, inverter and filter output, and described DSP control module is also connected with computing machine.The various characteristicses such as this proving installation energy simulating grid voltage, frequency jitter, flickering, harmonic wave, can meet grid adaptability test request.
As shown in Figure 2, wave filter adopts three-phase Γ type LC wave filter, and it is a kind of low-pass filter, simple in structure and dependable performance.The present invention adopts three winding phase shift step-up transformers to reduce secondary output current, thereby greatly reduces the electric energy loss on filter filtering inductance.
As shown in Figure 3, the A/D converter of DSP control module gathers respectively the relevant information of rectifier output dc voltage information, inverter output AC voltage, wave filter output AC voltage to DSP control module structural drawing of the present invention; PWM control module output terminal provides the driving signal of inverter, and the make-and-break signal that digital I/O mouth provides input isolating switch and output isolating switch, detection to prepare switch is caught a mouthful collection filter output voltage zero passage detection signal.
The software section of DSP comprises master routine and interrupt routine part, and master routine part is mainly carried out initialization, and the working method of each functional module of TMS320F2812 is set.After initialization completes, enter waiting status, in the time producing interruption, enter the interrupt service subroutine setting.Interrupt routine part comprises two subroutines; subroutine 1 is timer 1 interruption subroutine; thereby its adopts sliding mode control strategy to regulate and export accurately pwm signal to inverter filter output voltage; this program also completes output signal defencive function simultaneously, and Fig. 4 is interrupt service subroutine control signal process flow diagram.Subroutine 2 is for catching a mouthful interruption subroutine, it is used for input voltage signal to position, utilize filter output voltage caught to locate voltage vector zero point, obtain after zero point, in one-period, carry out the phase place of given voltage with timer 2, through necessarily conversion, can obtain the physical location of filter output voltage vector.
As shown in Figure 5, wherein, described test is prepared switch for control simulation electrical network or actual electric network access to detailed circuit diagram of the present invention.Prepare switch closure when test, three phase network and wind power system are connected, and device is in waiting for test phase; In the time of achievement of test readiness, disconnect test and prepare switch, enter test process.
Described input isolating switch not only can control device break-make, and can play overcurrent protection; Three winding step-up transformers adopt two-pack limit form and Y/Y/ Δ connected modes, have so both reduced the harmonic wave that flows into electrical network, have promoted again output voltage capability, make that the voltage-sharing of flat wave capacitor below becomes simultaneously simply.
The output of three winding step-up transformers connects rectifier, and this rectifier adopts 12 pulse rectification mode, is about to two groups of uncontrollable rectifier bridge series connection of three-phase.Adopt uncontrollable rectifier bridge, reduce the input of control signal, reduced cost and simplified implementation procedure.
Described time delay closing relay is composed in parallel by current-limiting resistance and time closing relay switch, when device rigidly connects into power supply, time closing relay switch is in off-state, the DC current of rectifier output flows into DC bus through current-limiting resistance, through limiting time, time delay relay switch closure, by current-limiting resistance short circuit, area loss in minimizing.This relay can be in the time that flat wave capacitor starts to charge Limited Current excessive, improve electric capacity security.
Flat wave capacitor is by multiple Capacitance parallel connections and being composed in series.Inverter is voltage source inverter, uses Sine Pulse Width Modulation control, and three-phase fully-controlled inverter bridge adopts the IGBT module of two discrete units forms.
DSP control module adopts TMS320F2812 chip, prepare the break-make of switch for control inputs isolating switch, output isolating switch, test, control inverter, the signals such as output voltage, electric current, phase place, frequency and the harmonic wave of collection rectifier, inverter and wave filter, communicate with host computer simultaneously.
A method of testing for wind-electricity integration proving installation, as shown in Figure 5, in the time of grid-connected detection, switch is prepared in input isolating switch, detection and output isolating switch is all closed, and device to be measured and three phase network join, in waiting for detected state.In the time meeting test request, detect and prepare switch disconnection, computing machine nominative testing project (voltage fluctuation, frequency jitter, imbalance of three-phase voltage, flickering or harmonic wave adaptive testing) also transmits test command to DSP; DSP control module, according to the instantaneous value of the voltage waveform that will produce, calculates and produces the corresponding switching frequency of every phase brachium pontis SPWM ripple; Line voltage exports two 6 pulsation rectifications to through two secondary windings of three phase winding phase-shifting transformers, and timing relay is after set time closure, and the DC voltage of rectification output is charged to DC link flat wave capacitor; DC voltage is amplified through inverter, obtains high-power driving waveform, export through Γ type LC wave filter, and filtering switching frequency composition, then after step-down transformer step-down, be connected to wind power system.
Fig. 6 is the sliding formwork control structure figure of described DSP to filter output voltage, in order to obtain the voltage waveform of nominative testing exactly, needs DSP accurately to control inverter.Voltage can produce loss after device after filtering, and for reducing this impact, the present invention adopts sliding formwork control to control by setting value filter output voltage.The form that controller adopts switch function and feedback to combine, supposes voltage setting value and voltage actual value deviation e=U
r-U
o, definition slipping plane s=e, sliding mode controller adopts this form u=-ρ sgn (e)-ke, and wherein ρ is the constant that is greater than zero.With reference to conventional PI control, the method advantage is: accelerated the dynamic responding speed of inverter output voltage, made filter output voltage and voltage setting value basically identical.
Claims (9)
1. a wind-electricity integration proving installation, it is characterized in that, described grid-connected proving installation comprises: switch, DSP control module and computing machine are prepared in three winding step-up transformers, rectifier, time delay closing relay, flat wave capacitor, inverter, wave filter, input isolating switch, output isolating switch and detection, the input end of described input isolating switch connects three-phase alternating current electrical network, the output terminal of output isolating switch connects wind generator system, the output terminal of described input isolating switch connects the three former limit of winding step-up transformer winding input ends, the secondary winding output terminal of described three winding step-up transformers connects rectifier input end, described rectifier output end is connected with the input end of flat wave capacitor through time delay closing relay after connecting DC bus again, described flat wave capacitor output terminal connects inverter input terminal, described inverter output end connects filter input end, described filter output connects the former limit of step-down transformer, described step-down transformer secondary connects output isolating switch input end, described detection is prepared switch and is connected across input isolating switch output terminal and output isolating switch input end, described DSP control module connects respectively rectifier output end, inverter control signal input part, inverter and filter output, and described DSP control module is also connected with computing machine.
2. wind-electricity integration proving installation according to claim 1, is characterized in that, described three winding step-up transformers adopt Y/Y/ Δ mode to connect.
3. wind-electricity integration proving installation according to claim 1, is characterized in that, described rectifier adopts 12 pulse rectification mode, is about to two groups of uncontrollable rectifier bridge series connection of three-phase.
4. wind-electricity integration proving installation according to claim 1, is characterized in that, described time delay closing relay is composed in parallel by current-limiting resistance and time closing relay switch.
5. wind-electricity integration proving installation according to claim 1, it is characterized in that, described inverter is the voltage source inverter of Sine Pulse Width Modulation control, and described inverter is three-phase three brachium pontis working methods, and described inverter adopts symmetric triangular ripple as carrier wave.
6. wind-electricity integration proving installation according to claim 1, is characterized in that, described wave filter is three-phase Γ type LC wave filter.
7. wind-electricity integration proving installation according to claim 1, is characterized in that, DSP control module adopts TMS320F2812 chip.
8. a method of testing for wind-electricity integration proving installation as claimed in claim 1, is characterized in that, it is that grid-connected detection is prepared that switch is prepared in described detection, determines the break-make of actual electric network or simulating grid and blower fan; Computing machine nominative testing project also transmits test command to DSP control module, and DSP control module produces corresponding Driven by inverter signal by test command; Line voltage is exported the desired analog voltage of grid-connected test that computing machine is specified after three winding step-up transformer phase shifts, rectification, inversion, step-down, then tests according to wind-powered electricity generation unit grid adaptability test relevant regulations.
9. the method for testing of wind-electricity integration proving installation according to claim 8, it is characterized in that, described DSP control module is according to given voltage, and adopting Active Control Method is that sliding formwork control is followed the tracks of control to filter output voltage, thereby makes filter output voltage reach appointment requirement.
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| CN108318813A (en) * | 2018-04-16 | 2018-07-24 | 国家电网公司 | A kind of direct current calibration equipment suitable for rotor over-voltage protection device |
| CN109687703A (en) * | 2018-12-07 | 2019-04-26 | 浙江工业大学 | Step-down type dc converter set time sliding-mode control based on interference Estimation of Upper-Bound |
| CN112162161A (en) * | 2020-09-23 | 2021-01-01 | 广东电网有限责任公司 | Detection system and detection method for power electronic grid-connected device |
| CN114705935A (en) * | 2022-03-29 | 2022-07-05 | 深圳市首航新能源股份有限公司 | Testing method and testing platform for grid-connected electronic equipment |
| CN116243096A (en) * | 2023-05-10 | 2023-06-09 | 深圳弘远电气有限公司 | Test circuit for high-power conversion device of weak power grid and control method thereof |
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| CN104965124A (en) * | 2015-07-03 | 2015-10-07 | 杭州思绿能源科技有限公司 | Electronic type synchronous check relay |
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| CN106680624A (en) * | 2016-12-12 | 2017-05-17 | 国家电网公司 | In-loop test system of performance of power grid devices |
| CN106997804A (en) * | 2017-05-19 | 2017-08-01 | 国网山东省电力公司莱芜供电公司 | Three winding flexibility ULTC, low-voltage network system and control method |
| CN108318813A (en) * | 2018-04-16 | 2018-07-24 | 国家电网公司 | A kind of direct current calibration equipment suitable for rotor over-voltage protection device |
| CN109687703A (en) * | 2018-12-07 | 2019-04-26 | 浙江工业大学 | Step-down type dc converter set time sliding-mode control based on interference Estimation of Upper-Bound |
| CN112162161A (en) * | 2020-09-23 | 2021-01-01 | 广东电网有限责任公司 | Detection system and detection method for power electronic grid-connected device |
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| CN114705935A (en) * | 2022-03-29 | 2022-07-05 | 深圳市首航新能源股份有限公司 | Testing method and testing platform for grid-connected electronic equipment |
| CN117148260A (en) * | 2023-03-02 | 2023-12-01 | 国网河北省电力有限公司营销服务中心 | Metering deviation positioning method, metering deviation positioning device, metering deviation positioning terminal and storage medium |
| CN117148260B (en) * | 2023-03-02 | 2024-05-28 | 国网河北省电力有限公司营销服务中心 | Metering deviation positioning method, metering deviation positioning device, metering deviation positioning terminal and storage medium |
| CN116243096A (en) * | 2023-05-10 | 2023-06-09 | 深圳弘远电气有限公司 | Test circuit for high-power conversion device of weak power grid and control method thereof |
| CN116243096B (en) * | 2023-05-10 | 2023-07-21 | 深圳弘远电气有限公司 | Test circuit for high-power conversion device of weak power grid and control method thereof |
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