CN104198853B - A kind of wind-electricity integration test device and test method - Google Patents
A kind of wind-electricity integration test device and test method Download PDFInfo
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Abstract
The present invention relates to a kind of wind-electricity integration test device and test method, described device to include：Three winding step-up transformer, rectifier, time delay closing relay, flat wave capacitor, inverter, wave filter, input breaker, output breaker and detection prepare switch, DSP control unit and computer.The method is as follows：Control grid-connected test device generation to meet the power grid analog voltage of grid adaptability test request by DSP control unit, tested further according to Wind turbines grid adaptability test relevant regulations.The advantage of the invention is that reduce electric energy loss of the test device especially on LC filter inductances；The dynamic responding speed of inverter output voltage is accelerated, makes filter output voltage basically identical with voltage setting value；The grid-connected detection device uses common power electronic devices, and integrated level is high, and cost is low and test method is intuitively simple, can meet wind-electricity integration test request.
Description
Technical Field
The invention relates to a wind power grid-connected testing device and a testing method thereof, belonging to the technical field of wind power grid connection and aiming at meeting the requirement of wind power unit grid-connected adaptability testing.
Background
With the increasing energy crisis, wind energy has received wide attention as a renewable energy source in the world. In recent years, the wind power industry has been rapidly developed, the installed capacity has been increased, and wind power generation has become one of the indispensable approaches for electric energy sources. However, accidents such as fan off-grid and the like are caused by poor adaptability of the fan to a power grid, and the development of the wind power industry in China is severely restricted by the lag of the wind power grid-connected technology.
In order to improve the technical level of wind power and guarantee the performance of a fan and the safety of a power grid, the wind power grid-connected testing technology is gradually emphasized, China already carries out relevant research on the wind power grid-connected technology and sets corresponding standards, and the wind power grid-connected testing technology is required to carry out adaptability tests such as voltage, frequency, harmonic waves, voltage fluctuation and flicker, three-phase imbalance, high-low voltage ride through and the like when the fan is connected to the grid, and meets other grid-connected technical requirements.
In recent years, research on wind power grid connection tests at home and abroad is gradually increased, but the research mainly aims at the field of wind power grid connection monitoring, the electric energy quality is monitored through special equipment, and a fan power supply is cut off when voltage fluctuation is generated or the grid connection requirement is not met. Meanwhile, other grid-connected detection devices such as multifunctional grid simulators and photovoltaic grid-connected inverter test systems exist, but most of the devices have the problems of large volume, high electric energy loss, low dynamic response speed, high cost, complex operation and the like.
Disclosure of Invention
The invention aims to provide a wind power grid-connected testing device and a testing method.
In order to solve the technical problems, the invention adopts the following technical scheme:
a wind power grid-connected testing device comprises a three-winding step-up 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 preparation switch, a DSP control unit and a computer; the input end of the input circuit breaker is connected with a three-phase alternating current power grid, the output end of the output circuit breaker is connected with a wind power generation system, the output end of the input circuit breaker is connected with the input end of a primary winding of a three-winding boosting transformer, the output end of a secondary winding of the three-winding boosting transformer is connected with the input end of a rectifier, the output end of the rectifier is connected with a direct current bus and then connected with the input end of a flat wave capacitor through a delay closed relay, the output end of the flat wave capacitor is connected with the input end of an inverter, the output end of the inverter is connected with the input end of a filter, the; the detection preparation switch is bridged at the output end of the input circuit breaker and the input end of the output circuit breaker; the DSP control unit is respectively connected with the output end of the rectifier, the control signal input end of the inverter, the output end of the inverter and the output end of the filter, and is also connected with the computer.
Preferably, in the wind power grid-connected testing device, the three-winding step-up transformer is connected in a Y/Δ manner.
Preferably, in the wind power grid-connected testing device, the rectifier adopts a twelve-pulse rectification mode, that is, two groups of three-phase uncontrollable rectifier bridges are connected in series.
Preferably, in the wind power grid connection testing device, the delay closing relay is formed by connecting a current limiting resistor and a delay closing relay switch in parallel.
Preferably, in the wind power grid-connected testing device, the inverter is a voltage source type inverter controlled by Sinusoidal Pulse Width Modulation (SPWM), the inverter is in a three-phase three-bridge arm working mode, and the inverter uses symmetrical triangular waves as carriers.
Preferably, in the wind power grid-connected testing device, the filter is a three-phase Γ -type LC filter.
Preferably, in the wind power integration testing device, the DSP control unit uses a TMS320F2812 chip to control the on/off of the input breaker, the output breaker, and the test preparation switch, control the inverter, collect signals such as output voltage, current, phase, frequency, and harmonic of the rectifier, the inverter, and the filter, and communicate with the upper computer.
The invention also provides a testing method of the wind power grid-connected testing device, and the wind power grid-connected testing device is used for carrying out adaptability testing on the grid voltage with voltage fluctuation, frequency fluctuation, three-phase voltage unbalance, flicker or harmonic wave during grid connection.
Preferably, in the testing method of the wind power integration testing device, the detection preparation switch prepares for integration detection and determines on/off of an actual power grid or a simulated power grid and a fan. The computer designates a test item and transmits a test command to the DSP, and the DSP generates a corresponding inverter driving signal according to the designated command. The grid voltage is output to the analog voltage required by the grid-connected test appointed by the computer after passing through the three-winding phase-shifting step-up transformer, rectification, inversion and voltage reduction, and then the test is carried out according to the relevant regulations of the grid adaptability test of the wind turbine generator.
Preferably, in the testing method of the wind power integration testing device, the DSP performs tracking control on the output voltage of the filter by sliding mode control according to the specified voltage, so that the output voltage of the filter quickly meets the specified requirement.
The invention has the advantages that:
1. when the test is started, the step-up transformer is adopted, so that the secondary side current is reduced, and the electric energy loss of the test device, particularly the LC filter inductor, is reduced;
2. meanwhile, the sliding mode controller is adopted in the DSP control unit to control the output voltage of the inverter and the filter, so that the dynamic response speed of the output voltage of the inverter is accelerated, and the output voltage of the filter is basically consistent with a voltage set value;
3. the grid-connected detection device adopts common power electronic devices, has high integration level, low cost and visual and simple test method, and can meet the requirement of wind power grid-connected test.
Drawings
Fig. 1 is a structural diagram of a wind power integration testing apparatus according to an embodiment of the present invention.
Fig. 2 is a circuit diagram of an LC filter of the Γ type employed in the present invention.
Fig. 3 is a diagram of a DSP control unit structure according to an embodiment of the present invention.
FIG. 4 is a flow chart of the interrupt service subroutine control signal of the DSP control unit according to the embodiment of the present invention.
Fig. 5 is a circuit diagram of a wind power integration testing device according to an embodiment of the present invention.
Fig. 6 is a block diagram of a sliding mode control of the filter output voltage by the DSP in accordance with an embodiment of the present invention.
Detailed Description
The invention is further described with reference to the following figures and specific examples.
A wind power grid-connection testing device, as shown in fig. 1, the grid-connection testing device includes: the device comprises a three-winding step-up 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 preparation switch, a DSP control unit and a computer. The input end of the testing device is connected with a three-phase alternating current power grid, the output end of the testing device is connected with a wind power generation system, the output end of the input breaker is connected with the input end of a primary winding of a three-winding boosting transformer, the output end of a secondary winding of the three-winding boosting transformer is connected with the input end of a rectifier, the output end of the rectifier is connected with a direct current bus and then is connected with a flat wave capacitor through a time delay closed relay, the output end of the flat wave capacitor is connected with the input end of an inverter, the output end of the inverter is connected with the input end of a filter, the output end of the filter is connected with; the detection preparation switch is bridged at the output end of the input circuit breaker and the input end of the output circuit breaker; the DSP control unit is respectively connected with the output end of the rectifier, the control signal input end of the inverter, the output end of the inverter and the output end of the filter, and is also connected with the computer. The testing device can simulate various characteristics of power grid voltage, frequency fluctuation, flicker, harmonic waves and the like, and can meet the requirement of power grid adaptability testing.
As shown in fig. 2, the filter is a three-phase Γ -type LC filter, which is a low-pass filter with simple structure and reliable performance. The invention adopts the three-winding phase-shifting step-up transformer to reduce the output current of the secondary side, thereby greatly reducing the electric energy loss on the filter inductance of the filter.
The structure diagram of the DSP control unit of the invention is shown in figure 3, an A/D converter of the DSP control unit respectively collects the information of the DC voltage output by a rectifier, the AC voltage output by an inverter and the relevant information of the AC voltage output by a filter; the output end of the PWM control unit provides a driving signal of the inverter, the digital I/O port provides on-off signals of the input breaker, the output breaker and the detection preparation switch, and the capture port acquires a voltage zero-crossing detection signal output by the filter.
The software part of the DSP comprises a main program part and an interrupt program part, wherein the main program part is mainly initialized, and the working mode of each functional module of the TMS320F2812 is set. After the initialization is finished, the system enters a waiting state, and when an interrupt is generated, the system enters a set interrupt service subprogram. The interruption program part comprises two subprograms, the subprogram 1 is an interruption subprogram of the timer 1, the sliding mode control strategy is adopted to regulate the output voltage of the filter so as to output an accurate PWM signal to the inverter, and meanwhile, the program also completes the output signal protection function, and fig. 4 is a control signal flow chart of the interruption service subprogram. The subroutine 2 is a capture port interrupt subroutine, and is used to locate the input voltage signal, locate the zero point of the voltage vector by capturing the output voltage of the filter, and after obtaining the zero point, the timer 2 is used to designate the phase of the voltage in one period, and the actual position of the output voltage vector of the filter can be obtained after certain conversion.
The detailed circuit diagram of the invention is shown in fig. 5, wherein the test preparation switch is used for controlling the access of a simulated power grid or an actual power grid. When the test preparation switch is closed, the three-phase power grid and the wind power system are switched on, and the device is in a test waiting stage; and when the test is ready, the test preparation switch is switched off, and the test process is started.
The input circuit breaker can not only control the on-off of the device, but also play a role in overcurrent protection; the three-winding step-up transformer adopts a double-auxiliary-side form and a Y/Y/delta connection mode, so that harmonic waves flowing into a power grid are reduced, the output voltage capability is improved, and the voltage-sharing problem of a subsequent flat-wave capacitor is simplified.
The output of the three-winding step-up transformer is connected with a rectifier, and the rectifier adopts a twelve-pulse rectification mode, namely two groups of three-phase uncontrollable rectifier bridges are connected in series. And an uncontrollable rectifier bridge is adopted, so that the input of control signals is reduced, the cost is reduced, and the implementation process is simplified.
The delay closed relay is formed by connecting a current-limiting resistor and a delay closed relay switch in parallel, when the device is just connected to a power supply, the delay closed relay switch is in an off state, direct current output by the rectifier flows into a direct current bus through the current-limiting resistor, and after a limited time, the delay closed relay switch is closed, so that the current-limiting resistor is short-circuited, and the loss is reduced. The relay can limit the overlarge current when the flat wave capacitor starts to charge, and the safety of the capacitor is improved.
The smoothing capacitor is composed of a plurality of capacitors connected in parallel and in series. The inverter is a voltage source type inverter and is controlled by Sinusoidal Pulse Width Modulation (SPWM), and the three-phase full-control inverter bridge adopts a double-unit discrete IGBT module.
The DSP control unit adopts a TMS320F2812 chip and is used for controlling the on-off of an input breaker, an output breaker and a test preparation switch, controlling an inverter, collecting signals of output voltage, current, phase, frequency, harmonic wave and the like of a rectifier, the inverter and a filter and simultaneously communicating with an upper computer.
A testing method of a wind power grid-connected testing device is disclosed, as shown in figure 5, when in grid-connected detection, an input breaker, a detection preparation switch and an output breaker are all closed, and a device to be tested is connected with a three-phase power grid and is in a state of waiting for detection. When the test requirement is met, the detection preparation switch is switched off, the computer specifies a test item (voltage fluctuation, frequency fluctuation, three-phase voltage unbalance, flicker or harmonic wave adaptability test) and transmits a test command to the DSP; the DSP control unit calculates the switching frequency corresponding to the SPWM wave of each phase of bridge arm according to the instantaneous value of the voltage waveform to be generated; the voltage of the power grid is output to two 6-pulse rectifiers through two secondary windings of the three-phase winding phase-shifting transformer, and after the delay relay is closed for a fixed time, the direct-current voltage output by the rectifiers charges a direct-current link flat-wave capacitor; the direct-current voltage is amplified by the inverter to obtain a high-power driving waveform, the high-power driving waveform is output, a switching frequency component is filtered by the high-power driving waveform through the gamma type LC filter, and the high-power driving waveform is reduced in voltage by the step-down transformer and then is connected to the wind power system.
Fig. 6 is a structure diagram of sliding mode control of the DSP on the output voltage of the filter, and in order to obtain a voltage waveform accurately specified for testing, the DSP is required to accurately control the inverter. The voltage can generate loss after passing through the filter, and in order to reduce the influence, the sliding mode control is adopted to control the output voltage of the filter according to a set value. The controller adopts a form of combining a switching function and feedback, and the deviation e between the voltage set value and the voltage actual value is assumed to be Ur-UoDefining the sliding surface s ═ e, the sliding mode controller takes the form u ═ - ρ sgn (e) -ke where ρ is a constant greater than zero. Referring to the traditional PI control, the method has the advantages that: the dynamic response speed of the output voltage of the inverter is accelerated, and the output voltage of the filter is basically consistent with the set value of the voltage.
Claims (4)
1. The utility model provides a wind-powered electricity generation testing arrangement that is incorporated into power networks which characterized in that, incorporated into power networks testing arrangement includes: the device comprises a three-winding step-up 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 preparation switch, a DSP control unit and a computer; the input end of the input circuit breaker is connected with a three-phase alternating current power grid, the output end of the output circuit breaker is connected with a wind power generation system, the output end of the input circuit breaker is connected with the input end of a primary winding of a three-winding boosting transformer, the output end of a secondary winding of the three-winding boosting transformer is connected with the input end of a rectifier, the output end of the rectifier is connected with a direct current bus and then connected with the input end of a flat wave capacitor through a delay closed relay, the output end of the flat wave capacitor is connected with the input end of an inverter, the output end of the inverter is connected with the input end of a filter, the; the detection preparation switch is bridged at the output end of the input circuit breaker and the input end of the output circuit breaker; the DSP control unit is respectively connected with the output end of the rectifier, the control signal input end of the inverter, the output end of the inverter and the output end of the filter, and is also connected with the computer; wherein,
the three-winding step-up transformer is connected in a Y/Y/delta mode;
the rectifier adopts a twelve-pulse rectification mode, namely two groups of three-phase uncontrollable rectifier bridges are connected in series;
the delay closing relay is formed by connecting a current limiting resistor and a delay closing relay switch in parallel;
the inverter is a voltage source type inverter controlled by Sinusoidal Pulse Width Modulation (SPWM), the inverter is in a three-phase three-bridge arm working mode, and symmetrical triangular waves are used as carriers.
2. The wind power grid-connection testing device according to claim 1, wherein the filter is a three-phase inverted L-shaped LC filter.
3. The wind power integration testing device according to claim 1, wherein the DSP control unit adopts a TMS320F2812 chip.
4. The testing method of the wind power integration testing device according to claim 1, characterized in that the detection preparation switch prepares for integration detection and determines on/off of an actual power grid or a simulated power grid and a fan; the computer appoints a test item and transmits a test command to the DSP control unit, and the DSP control unit generates a corresponding inverter driving signal according to the test command; the method comprises the following steps that the power grid voltage is subjected to phase shifting of a three-winding step-up transformer, rectifier rectification, inverter inversion and step-down of a step-down transformer, then an analog voltage required by a computer specified grid-connected test is output, and then the test is carried out according to related regulations of the wind turbine generator power grid adaptability test; the DSP control unit performs tracking control on the output voltage of the filter by adopting an active control method, namely sliding mode control, according to the specified voltage, so that the output voltage of the filter meets the specified requirement.
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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 |
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| CN112162161B (en) * | 2020-09-23 | 2022-07-29 | 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 |
| 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 |
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Effective date of registration: 20201217 Address after: Room 502-2, building 5, No. 49, Wengang South Road, Yannan high tech Zone, Yancheng City, Jiangsu Province 224000 (CNx) Patentee after: YANCHENG YIDONG TECHNOLOGY SERVICE Co.,Ltd. Address before: Meng Xi Road 212003 Zhenjiang city of Jiangsu province Jingkou District No. 2 Patentee before: JIANGSU University OF SCIENCE AND TECHNOLOGY Effective date of registration: 20201217 Address after: Room 206 (CNx), xifuhe digital intelligent innovation community Exhibition Center building, 49 Wengang South Road, Yannan high tech Zone, Yancheng City, Jiangsu Province Patentee after: Yancheng Yannan high tech Zone xifuhe digital intelligent industry development Co.,Ltd. Address before: Room 502-2, building 5, No. 49, Wengang South Road, Yannan high tech Zone, Yancheng City, Jiangsu Province 224000 (CNx) Patentee before: YANCHENG YIDONG TECHNOLOGY SERVICE Co.,Ltd. |
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Effective date of registration: 20210914 Address after: 224000 south side of Dongjin Middle Road, Yancheng City, Jiangsu Province Patentee after: JIANGSU XINDA GAOKONG ENGINEERING Co.,Ltd. Address before: Room 206 (CNx), xifuhe digital intelligent innovation community Exhibition Center building, 49 Wengang South Road, Yannan high tech Zone, Yancheng City, Jiangsu Province Patentee before: Yancheng Yannan high tech Zone xifuhe digital intelligent industry development Co.,Ltd. |