CN114825991A - Topological structure and method for testing power electronic converter - Google Patents
Topological structure and method for testing power electronic converter Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M7/2173—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only in a biphase or polyphase circuit arrangement
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
- H02J3/16—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by adjustment of reactive power
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/26—Arrangements for eliminating or reducing asymmetry in polyphase networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/12—Arrangements for reducing harmonics from ac input or output
Abstract
The invention discloses a topological structure and a method for testing a power electronic converter, and belongs to the technical field of SVG testing. The topological structure comprises an SVG device, a voltage transformer, a current transformer, a phase-locked loop, a direct current voltage control device and a third harmonic current control device; the SVG device is connected to a power grid by adopting a direct hanging type and angle connection method; the voltage transformer and the current transformer are used for acquiring voltage information and current information of a power grid, and a phase-locked angle is obtained through the phase-locked loop; and the third harmonic current control device adds a third harmonic signal into the modulated wave signal and controls the interior of the SVG device to form third harmonic circulation through modulation. The invention only needs one SVG device, is not limited by the number of converter valve modules, does not need additional SVG devices for accompanying measurement, only needs to add a three-phase circulation control module, completes corresponding test according to the characteristic that three circulations exist in the corner joint of the SVG device, has low test cost and is easy to realize.
Description
Technical Field
The invention relates to the technical field of SVG testing, in particular to a topological structure and a method for testing a power electronic converter.
Background
With the development of power systems, the market demands for fast dynamic compensation of reactive power are increasing. Compared with the traditional reactive power compensation device, the Static Var Generator (SVG) plays a very important role in improving the power quality and reactive power compensation because of the advantages of high reactive current regulation speed, wide operation range, low harmonic content and the like, and is the development direction of the dynamic reactive power compensation device.
The SVG adopts a self-commutation bridge circuit, is connected to the power grid through a reactor or a transformer, adjusts the alternating current side current of the bridge circuit or the amplitude and the phase of the output voltage of the bridge circuit, can enable the circuit to send or absorb the required reactive current, and realizes dynamic reactive power compensation. Because SVG has each contravariant unit independent, easily modularization extension, advantages such as voltage grade height, obtain respecting in high-pressure large capacity harmonic and reactive compensation. When the SVG is used for large-capacity transmission, the SVG needs to work under the working conditions of high voltage and large current for a long time, so the reliability of the SVG is very important for the safe operation of a system. Therefore, before the SVG is delivered to customers and put into operation on site, test verification which is equivalent to the actual working condition strength is required to be carried out.
The current common valve section test mode is to adopt two sets of SVG devices with the same valve number, one SVG device sends out inductive reactive power, and the other SVG device sends out capacitive reactive power, so as to realize power complementation. Theoretically, this method can effectively verify valve section equipment performance. However, in practical tests, the method has more defects: two SVG devices are needed, a charging power supply, an energy supplementing power supply and a switch element are additionally added, the cost is increased, and the energy of the energy supplementing power supply is distributed to other sub-modules by additional control; the control is complex, only reactive power can be transmitted between the two converter valves, but the voltage and phase angle control of the converter valves can cause direct current components and alternating current components to appear in test loop current, the active power in each converter valve needs to be balanced out through precise control, and the control is difficult.
Disclosure of Invention
The invention aims to provide a test method for fully loading a high-capacity converter by utilizing third harmonic circulating current, aiming at the defects of the conventional valve section opposite impact test.
The technical scheme of the invention is as follows: a topology for power electronic converter testing, characterized by: the device comprises an SVG device, a voltage transformer, a current transformer, a phase-locked loop, a direct current voltage control device and a third harmonic current control device;
the SVG device is connected to a power grid by adopting a direct hanging type and angle connection method;
the voltage transformer and the current transformer are connected to a power grid and used for acquiring voltage information and current information of the power grid, and a phase-locked angle is obtained through the phase-locked loop;
the direct-current voltage control device is used for detecting direct-current voltage deviation and generating a corresponding output current command and a corresponding modulated wave voltage command;
and the third harmonic current control device adds a third harmonic signal into the modulated wave signal and controls the interior of the SVG device to form third harmonic circulation through modulation.
Further, the SVG device can be provided with 1 or more tested power units per phase.
Further, the dc voltage control device includes: the method comprises the following steps of total direct current voltage balance control, interphase direct current voltage balance control, unit direct current voltage balance control and current loop control;
the total direct current voltage balance control is used for total direct current voltage control of all the power units;
the inter-phase direct-current voltage balance control realizes the balance of the direct-current voltages of the three single phases on the basis of the stability of the total direct-current voltage;
and the unit direct-current voltage balance control is used for realizing the direct-current voltage balance of each power unit in a single phase.
A method for testing a power electronic converter is based on the topological structure, and is characterized by comprising the following steps:
(1) the SVG device is connected to a power grid by adopting a direct hanging type and angle connection method;
(2) the voltage transformer acquires power grid voltage information, and a phase locking angle is obtained through a phase-locked loop, so that the frequency of an output signal tracks the frequency of a power grid; the current transformer acquires power grid current information;
(3) according to the output of the phase-locked loop, a direct-current voltage control device detects direct-current voltage deviation and generates a corresponding output current instruction and a corresponding modulated wave voltage instruction;
(4) and the third harmonic current control device issues a third harmonic current instruction, adds the third harmonic current instruction into the modulated wave voltage instruction, and controls the interior of the SVG device to form third harmonic circulation so as to carry out a full load test.
Furthermore, each phase of the SVG device has 1 or more tested power units.
Furthermore, when unit testing is carried out, 1 tested power unit is arranged in each phase of the SVG device; when valve section hedging test is carried out, 4-6 tested power units of each phase of the SVG device are provided; when the whole machine hedging test is carried out, the number of each phase of tested power units of the SVG device is not less than 10, and the number of each phase of tested power units is the number of each phase of modules in the actual whole machine.
Further, the dc voltage control device includes: total direct current voltage balance control, interphase direct current voltage balance control, unit direct current voltage balance control and current loop control.
Further, the specific steps in step 3 are as follows:
the total direct current voltage balance control controls the total direct current voltage of all the power units;
the inter-phase direct-current voltage balance control is characterized in that active components and zero sequence components are added into current command signals to act with the fundamental voltage of the power grid, active exchange between the SVG device and the power grid and active exchange among phases of the SVG device are generated, and three single-phase direct-current voltage balance of the SVG device is achieved;
and the unit direct-current voltage balance control adds a negative sequence component into the modulation voltage of each power unit of the SVG device, and controls the direct-current voltage balance of each phase of power unit of the SVG device.
Further, the step 4 specifically includes the following steps:
(4.1) issuing a third harmonic current instruction by a third harmonic current control device, multiplying the third harmonic current instruction by 3 omega L to obtain a third harmonic voltage, and performing inverse dq conversion to obtain a three-phase third harmonic voltage signal;
(4.2) adding the three-phase third harmonic voltage signal into a modulation signal output by the direct-current voltage control device, wherein the modulation signal controls the interior of the SVG device to form third harmonic circulation;
and (4.3) adjusting the duty ratio, and increasing the zero-sequence circulating current between each phase of the SVG device to the rated current to perform a full-load test.
The invention has the following beneficial effects:
the test platform is simple: according to the method, only one SVG device is needed, the number of converter valve modules is not limited, additional SVG devices for accompanying measurement are not needed, special test power supplies such as a charging power supply and an energy supplementing power supply are not needed, and only a power grid is needed to provide three-phase power frequency alternating current power supply. The test cost is low, and the realization is easy.
The control method is simple: most of the control scheme of the invention and the normal grid-connected control scheme of the SVG are maintained to be multiplexed, and only a three-phase loop control module is required to be added. According to the characteristic that third circulation exists inside the corner joint, third harmonic circulation control is added. Two SVG devices do not need to be subjected to balance control, and the control difficulty is reduced.
By comparing the loss and junction temperature of the IGBT and the diode, the method can be equivalent to a common valve section hedging test method, the aim of hedging the valve section is fulfilled, the cost is lower, and the method is easier to realize.
Drawings
Fig. 1 is a schematic diagram of a topology for power electronic converter testing according to the present invention.
Fig. 2 is a vector diagram of the three-phase fundamental current of the present invention.
Fig. 3 is a third harmonic vector diagram of the present invention.
FIG. 4 is a general control block diagram of the present invention.
FIG. 5 is a waveform of valve operation with inductive full load reactive and third harmonic injection.
Fig. 6 is a waveform diagram of total loss of each device of an H bridge under inductive full load reactive power and third harmonic injection.
Fig. 7 is a waveform diagram of junction temperature of each device of an H bridge under inductive full-load reactive power and injected third harmonic.
FIG. 8 is a schematic diagram of a unit test control topology.
FIG. 9 is a schematic view of a valve segment hedging control topology.
Fig. 10 is a schematic diagram of a complete machine hedging control topology.
Detailed Description
The embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.
The technical scheme provided by the invention is as follows: the SVG device adopts a direct-hanging type and angle connection method, and the direct-current voltage control method comprises total direct-current voltage balance control, interphase direct-current voltage balance control and in-phase unit voltage balance control. According to the characteristic that zero sequence current, third harmonic and multiple harmonics thereof form zero sequence circulation in the SVG when the SVG is in angular connection, the SVG is enabled to work in a constant reactive power operation mode, the third harmonic current is added into a modulation wave to adjust the duty ratio under the condition that the SVG can only absorb a small amount of active loss power from a three-phase power frequency AC power grid, the zero sequence circulation between each phase of the SVG is increased to the rated current, valve section angle inner impact is carried out, reactive influence on the system is small, and the purpose of utilizing the third harmonic circulation to enable a large-capacity converter to be fully loaded and tested is achieved.
As shown in fig. 1: the invention relates to a topological structure schematic diagram for testing a power electronic converter, wherein SVG is connected to a power grid by adopting a direct hanging type and angle connection method, and each phase of tested power units can be 1 or more. PT (potential transformer) is added to the network side to obtain the voltage information of the power grid, and a phase locking angle is obtained through a phase-locked loop, so that the frequency of an output signal tracks the frequency of the power grid. And a CT (current transformer) is added at the network side and is used for acquiring the network side current.
Fig. 2 is a vector diagram of three-phase fundamental current. Can be expressed as a function of formula (1):
the relation of the three-phase third harmonic can be obtained according to the formula (1) as follows:
the phase difference between the third harmonics is obtained by the formula (2) and is 360 degrees, which is equivalent to zero sequence current.
As shown in fig. 3, the third harmonic is equivalent to a zero sequence current. Similarly, the multiple harmonics of 3 are also all equivalent to zero sequence current. Therefore, SVG adopts the triangle-shaped method of connecing, and zero sequence current, third harmonic and its multiple harmonic can form the circulation between the three-phase.
FIG. 4 is a general control block diagram. The DC side voltage control system comprises: the control method comprises total direct current voltage balance control, interphase direct current voltage balance control and unit direct current voltage balance control. The inner ring adopts a current ring. The total direct-current voltage balance control is used for controlling the total direct-current voltage of all the power units; the inter-phase direct-current voltage balance control realizes three single-phase direct-current voltage balance on the basis of total direct-current voltage stability, active power component and zero sequence component are added into a current instruction signal, and the active power component and the zero sequence component act with the fundamental voltage of the power grid to generate active power exchange between the SVG device and the power grid and active power exchange among phases of the SVG device; the unit direct-current voltage balance control is used for realizing direct-current voltage balance of each power unit in a single phase, and for each power unit of the SVG device, a negative sequence component is added into the modulation voltage of the power unit to control the direct-current voltage balance of the power unit in each phase.
Most of the control scheme of the invention and the normal grid-connected control scheme of the SVG are maintained and reused, and only a three-phase circulation control related module is required to be added. In the three-phase loop control module, in order to realize full load of the SVG, a third harmonic signal is added into a modulation wave signal. Specifically, a third harmonic current command is issued, the third harmonic voltage is obtained by multiplying the third harmonic current command by 3 ω L, a three-phase third harmonic voltage signal is obtained through inverse dq conversion, the signal is added to a modulation signal, and a third harmonic circulating current can be formed inside through modulation. And adding third harmonic current into the current instruction, adjusting the duty ratio, increasing the zero-sequence circulating current between each phase to the rated current, and performing a full-load test on the SVG by using the third harmonic. And a test power supply is not required to be additionally arranged, and only three-phase power frequency power supply is required.
After the SVG is fully loaded by utilizing the third harmonic wave, in order to achieve the valve section hedging effect, the losses of the on and off of the IGBT tube and whether the junction temperature is the same under the two conditions of inductive fully loaded idle work and fully loaded by utilizing the third harmonic wave are also considered.
The IGBT tube loss and junction temperature test method comprises the following steps: and performing hedging by adopting full-load current, and comparing and analyzing whether the heat loss and the junction temperature of the valve are similar under two working conditions of inductive full-load reactive power and full-load by utilizing third harmonic so as to confirm whether the scheme of adopting hedging in the valve section angle can be equivalent to the loss of the valve in actual operation. In the test, 3-order harmonic full-load hedging in an angle is adopted, wherein the angle difference between the initial angle of the 3-order harmonic and the initial angle of the fundamental wave can be changed according to certain requirements.
Fig. 5 shows inductive full-load reactive power and valve operating waveforms injected with third harmonic, where the first two waveforms are the maximum and minimum of three-phase dc voltage, the third waveform is the converter valve internal current, and the peak values of the converter valve internal current waveforms in comparison (a) and (b) are both close to 3000A, and the magnitudes are close to each other, which proves that the converter valve can operate in a full-load state by injecting the third harmonic.
Fig. 6 is a waveform diagram of total loss of each device of the H-bridge under two working conditions of inductive full-load reactive power and injected third harmonic. Wherein, blue and red wave form are the loss of four IGBT pipes respectively, and green and brown wave form are the loss of four diodes respectively. Compared with the device loss difference under the two working conditions of (a) and (b), the device loss difference is very small, and the full load effect can be achieved by injecting the third harmonic.
Fig. 7 is a waveform diagram of junction temperature of each device of the H-bridge under two working conditions of inductive full-load reactive power and injected third harmonic. Wherein the junction temperature of the IGBT tube is about 80 ℃, and the loss of the diode is about 74 ℃. Comparing the junction temperature of the devices under the two working conditions (a) and (b), the difference is very small, and the full load effect can be achieved by injecting the third harmonic.
The results of the wear tests in Table 1 are summarized in the above experiments.
TABLE 1 comparative analysis table of loss test results
Table 1 shows the results of the loss test and comparative analysis, black fonts indicate the loss results of devices under inductive full load and reactive power, and blue fonts indicate the loss results of devices under injection of third harmonic. In the test, each bridge arm of the SVG selects 4 power units, and junction temperature, on-off loss conditions of the diode and the IGBT are contrastively analyzed under two working conditions that inductive full-load reactive power and third harmonic injection provided by the invention reach full load.
The test results are as follows: under two working conditions of inductive full-load reactive power and full-load utilization of third harmonic, the junction temperature difference of the IGBT is less than 1.1 ℃, and the junction temperature difference of the diode is less than 1.5 ℃; the difference of the total on-off loss of the IGBT and the diode is 0.18kW, and the total on-off loss when full load is achieved by utilizing third harmonic is only 0.95 percent lower than that under the inductive full-load reactive working condition.
Test results show that the IGBT tube loss and junction temperature in the method can be equivalent to the opposite impact effect of the traditional valve section.
The test method is described in detail in 3 examples below.
As shown in fig. 8, the test method for fully loading a large-capacity converter by using third harmonic circulating current in the present embodiment can be used for single module hedging to verify the reliability of a power module.
The SVG adopts the direct hanging type, the angle connection method to insert the electric wire netting, each phase is measured the power unit and is 1, carry on the single module hedging. PT (potential transformer) is added to the network side to obtain the voltage information of the power grid, and a phase locking angle is obtained through a phase-locked loop, so that the frequency of an output signal tracks the frequency of the power grid. And a CT (current transformer) is added at the network side and is used for acquiring the network side current. The DC voltage control method comprises total DC voltage balance control, interphase DC voltage balance control and in-phase unit voltage balance control.
According to the characteristic that zero sequence current, third harmonic and multiple harmonics thereof form zero sequence circulation in the SVG when the SVG is in angular connection, the SVG is enabled to work in a constant reactive power operation mode, third harmonic circulation control is added under the condition that only a small amount of active loss power is absorbed from a three-phase power frequency alternating current power grid, the third harmonic circulation control is added through adding third harmonic current into a modulation wave, the duty ratio is adjusted, the zero sequence circulation between phases is increased to the rated current, the power unit in an angle is subjected to hedging, and the purpose of carrying out single module hedging by utilizing the third harmonic circulation is achieved.
Embodiment mode 2
As shown in fig. 9, the test method for fully loading a large-capacity converter by using third harmonic circulating current in this embodiment can be used for valve section hedging, so that the current operation condition borne by the converter valve in the test is close to the actual operation condition, and the steady-state operation test can be accurately performed on the converter valve to be tested.
The SVG is connected to a power grid by adopting a direct hanging type and angle connection method, 4-6 tested power units are arranged in each phase, and valve section hedging is carried out. PT and CT are added to the network side for obtaining network side voltage and current. The DC voltage control method comprises total DC voltage balance control, interphase DC voltage balance control and in-phase unit voltage balance control.
According to the characteristic that zero sequence current, third harmonic and multiple harmonics thereof form zero sequence circulation in the SVG during angle connection, third harmonic circulation control is added, third harmonic current is added into modulated wave, duty ratio is adjusted, zero sequence circulation between phases is increased to the size of rated current, valve section hedging in an angle is carried out, and the purpose of utilizing third harmonic circulation to carry out valve section hedging is achieved.
Embodiment 3
As shown in fig. 10, the test method of the present embodiment using third harmonic circulating current to fully load the large-capacity converter can be used for SVG overall machine hedging. Because the SVG equipment has large single machine capacity and high rated voltage, the number of each phase of power modules in the whole machine is generally not less than 10. The performance of the equipment can be effectively checked by carrying out the hedging test before the whole machine leaves a factory, the stability is improved, and the successful and stable operation of the equipment in one-time operation on site is ensured.
The SVG is connected to a power grid by adopting a direct-hanging type and angle connection method, each phase of tested power unit is the number of each phase of module in an actual complete machine, generally not less than 10, and complete machine hedging is carried out. PT and CT are added to the network side for obtaining network side voltage and current. The DC voltage control method comprises total DC voltage balance control, interphase DC voltage balance control and in-phase unit voltage balance control.
According to the characteristic that zero sequence current, third harmonic and multiple harmonics thereof form zero sequence circulation in the SVG during angular joint, third harmonic circulation control is added, third harmonic current is added into modulated wave to adjust the duty ratio, the zero sequence circulation between phases is increased to the size of rated current, and the whole machine hedging is carried out, so that the purpose of carrying out whole machine hedging by using the third harmonic circulation is achieved.
In the above embodiment, the test method for full load of a high-capacity converter by using third harmonic circulating current provided by the invention can be used for single module opposite impact, valve section opposite impact and complete machine opposite impact, and is not limited by the number of modules in a corner.
Finally, the above examples are only intended to illustrate the technical solutions of the present invention, but not to limit the same, and after reading the present application, those skilled in the art will make various modifications or alterations to the present invention with reference to the above examples, which fall within the scope of the claims of the present application.
Claims (9)
1. A topology for power electronic converter testing, characterized by: the device comprises an SVG device, a voltage transformer, a current transformer, a phase-locked loop, a direct current voltage control device and a third harmonic current control device;
the SVG device is connected to a power grid by adopting a direct hanging type and angle connection method;
the voltage transformer and the current transformer are connected to a power grid and used for acquiring voltage information and current information of the power grid, and a phase-locked angle is obtained through the phase-locked loop;
the direct-current voltage control device is used for detecting direct-current voltage deviation and generating a corresponding output current command and a corresponding modulated wave voltage command;
and the third harmonic current control device adds a third harmonic signal into the modulated wave signal and controls the interior of the SVG device to form third harmonic circulation through modulation.
2. The topology for power electronic converter testing of claim 1, wherein said SVG device may have 1 or more power cells per phase tested.
3. The topology for power electronic converter testing of claim 1, wherein said dc voltage control means comprises: the method comprises the following steps of total direct current voltage balance control, interphase direct current voltage balance control, unit direct current voltage balance control and current loop control;
the total direct current voltage balance control is used for total direct current voltage control of all the power units; the interphase direct-current voltage balance control realizes the direct-current voltage balance of three single interphase of the SVG device on the basis of the stability of the total direct-current voltage;
and the unit direct-current voltage balance control is used for realizing the direct-current voltage balance of each power unit in the single phase of the SVG device.
4. A method for power electronic converter testing based on the topology of any one of claims 1 to 3, comprising the steps of:
(1) the SVG device is connected to a power grid by adopting a direct hanging type and angle connection method;
(2) the voltage transformer acquires power grid voltage information, and a phase locking angle is obtained through a phase-locked loop, so that the frequency of an output signal tracks the frequency of a power grid; the current transformer acquires power grid current information;
(3) according to the output of the phase-locked loop, a direct-current voltage control device detects direct-current voltage deviation and generates a corresponding output current instruction and a corresponding modulated wave voltage instruction;
(4) and the third harmonic current control device issues a third harmonic current instruction, adds the third harmonic current instruction into the modulated wave voltage instruction, and controls the interior of the SVG device to form third harmonic circulation so as to carry out a full load test.
5. A method for power electronic converter testing according to claim 4, characterized by: the number of the tested power units of each phase of the SVG device is 1 or more.
6. A method for power electronic converter testing according to claim 5, characterized by: when unit testing is carried out, 1 tested power unit is arranged in each phase of the SVG device;
when valve section hedging test is carried out, 4-6 tested power units of each phase of the SVG device are provided; when the whole machine hedging test is carried out, the number of each phase of tested power units of the SVG device is not less than 10, and the number of each phase of tested power units is the number of each phase of modules in the actual whole machine.
7. A method for power electronic converter testing according to claim 4, wherein the DC voltage control means comprises: total direct current voltage balance control, interphase direct current voltage balance control, unit direct current voltage balance control and current loop control.
8. The method for testing the power electronic converter according to claim 7, wherein the specific steps in the step 3 are as follows:
the total direct current voltage balance control controls the total direct current voltage of all the power units;
active power exchange between the SVG device and the power grid and active power exchange among phases of the SVG device are generated by adding an active component and a zero sequence component in a current instruction signal and acting with fundamental voltage of the power grid, so that three single-phase direct voltage balance of the SVG device is realized;
and the unit direct-current voltage balance control adds a negative sequence component into the modulation voltage of each power unit of the SVG device, and controls the direct-current voltage balance of each phase of power unit of the SVG device.
9. The method for testing the power electronic converter according to claim 4, wherein the specific steps in the step 4 are as follows:
(4.1) the third harmonic current control device issues a third harmonic current instruction, the third harmonic current instruction is multiplied by 3 omega L to obtain a third harmonic voltage, and a three-phase third harmonic voltage signal is obtained through inverse dq conversion;
(4.2) adding the three-phase third harmonic voltage signal into a modulation signal output by the direct-current voltage control device, wherein the modulation signal controls the interior of the SVG device to form third harmonic circulation;
and (4.3) adjusting the duty ratio, and increasing the zero-sequence circulating current between each phase of the SVG device to the rated current to perform a full-load test.
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102901893A (en) * | 2012-09-26 | 2013-01-30 | 西安奥特迅电力电子技术有限公司 | Control method for drag test of power units of high voltage static reactive power compensation device |
| CN103532156A (en) * | 2013-10-31 | 2014-01-22 | 湖南大学 | STATCOM unbalance compensation control method based on modular multilevel converter |
| CN103795067A (en) * | 2014-02-13 | 2014-05-14 | 辽宁立德电力电子股份有限公司 | Control method for 66 KV high-voltage directly-hung var generator |
| WO2016037419A1 (en) * | 2014-09-11 | 2016-03-17 | 成都麦隆电气有限公司 | Three-phase, precise independent compensation svg device and control method thereof |
| CN205377297U (en) * | 2015-12-28 | 2016-07-06 | 上海天正机电(集团)有限公司 | Mixed type dynamic reactive compensation cabinet |
| CN106340886A (en) * | 2016-08-30 | 2017-01-18 | 山东大学 | Novel control method suitable for cascaded H bridge static var compensator |
| CN108711870A (en) * | 2018-07-11 | 2018-10-26 | 中国矿业大学(北京) | Static Var Compensator control strategy based on energy one-way flow controlled rectifier |
-
2022
- 2022-03-14 CN CN202210247064.6A patent/CN114825991A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102901893A (en) * | 2012-09-26 | 2013-01-30 | 西安奥特迅电力电子技术有限公司 | Control method for drag test of power units of high voltage static reactive power compensation device |
| CN103532156A (en) * | 2013-10-31 | 2014-01-22 | 湖南大学 | STATCOM unbalance compensation control method based on modular multilevel converter |
| CN103795067A (en) * | 2014-02-13 | 2014-05-14 | 辽宁立德电力电子股份有限公司 | Control method for 66 KV high-voltage directly-hung var generator |
| WO2016037419A1 (en) * | 2014-09-11 | 2016-03-17 | 成都麦隆电气有限公司 | Three-phase, precise independent compensation svg device and control method thereof |
| CN205377297U (en) * | 2015-12-28 | 2016-07-06 | 上海天正机电(集团)有限公司 | Mixed type dynamic reactive compensation cabinet |
| CN106340886A (en) * | 2016-08-30 | 2017-01-18 | 山东大学 | Novel control method suitable for cascaded H bridge static var compensator |
| CN108711870A (en) * | 2018-07-11 | 2018-10-26 | 中国矿业大学(北京) | Static Var Compensator control strategy based on energy one-way flow controlled rectifier |
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