CN110632434A - Test platform for high and low voltage ride through and working method - Google Patents
Test platform for high and low voltage ride through and working method Download PDFInfo
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- CN110632434A CN110632434A CN201911083341.9A CN201911083341A CN110632434A CN 110632434 A CN110632434 A CN 110632434A CN 201911083341 A CN201911083341 A CN 201911083341A CN 110632434 A CN110632434 A CN 110632434A
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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Abstract
A test platform and working method of high, low voltage ride through, is used for obtaining the high, low voltage ride through test voltage of high-power apparatus such as static synchronous compensator STATCOM, static var generator SVG, fan frequency converter or photovoltaic inverter, the input end of the said test platform connects the 380V three-phase alternating current of commercial power, then input to the input end of the three-phase rectification unit through the first circuit breaker, the output end of the three-phase rectification unit links with input end of the three-phase controllable inversion unit, the output end of the three-phase controllable inversion unit links with primary side of the step-up transformer, the secondary side of the step-up transformer links with input end of static synchronous compensator STATCOM, static var generator SVG, fan frequency converter or photovoltaic inverter through the second circuit breaker; the test platform obtains electricity from a 380V power grid, and obtains voltage suitable for SVG high and low penetration function verification tests through rectification, inversion, boosting and other transformations. The test platform circuit has a simple structure, is easy to realize, and can meet the test requirements of high and low voltage ride through of the SVG.
Description
Technical Field
The invention relates to the technical field of high and low voltage ride through tests, in particular to a test platform for high and low voltage ride through and a working method.
Background
The high and low voltage ride through capability refers to the capability of the equipment to continue to operate without departing from the power grid and even provide certain reactive power for the system to help the system recover voltage under the condition that the terminal voltage of the power grid is reduced or increased to a certain value. The equipment with high and low voltage ride through capability can avoid the protection action time, and the normal operation is recovered after the fault is removed. The method can greatly reduce the repeated grid connection times of the power generation system during the fault, and reduce the impact on the power grid. The wind power converter and the photovoltaic inverter are required to carry out high and low voltage ride through type test certification forcibly, and in recent years, along with the expansion and extension of a new energy power station, the increase of power grid load and the improvement of technical strength of equipment manufacturers, the high and low voltage ride through requirements are gradually covered on the SVG equipment, and the equipment is required to play a role in reactive power support during the fault period of a power grid.
Therefore, the device manufacturer is required to have not only the corresponding simulation research capability but also the test verification capability of performing high and low voltage ride through on the corresponding test platform.
Disclosure of Invention
The invention provides a test platform for high and low voltage ride through and a working method, wherein the test platform can realize power taking from a 380V power grid, and test voltage meeting the high and low voltage ride through function test of SVG is obtained through three-stage conversion of rectification, inversion and boosting.
In order to achieve the purpose, the invention adopts the following technical scheme:
a high, low voltage ride through's test platform which characterized in that: the device is used for obtaining high and low voltage ride through test voltages of high-power equipment such as a static synchronous compensator STATCOM, a static var generator SVG, a fan frequency converter or a photovoltaic inverter and comprises a three-phase alternating current power grid, a first circuit breaker, a three-phase rectifying unit, a three-phase controllable inverting unit, a step-up transformer unit, a second circuit breaker and the static var generator SVG; the utility model discloses a three-phase rectifier unit, including test platform, three-phase rectifier unit's input, the output of three-phase rectifier unit is connected with the input of the controllable contravariant unit of three-phase, and the output of the controllable contravariant unit of three-phase is connected with step up transformer's primary side, and step up transformer's secondary side is connected with static synchronous compensator STATCOM, static var generator SVG, fan converter or photovoltaic inverter's input through the second circuit breaker.
The three-phase controllable inversion unit can realize the falling of single-phase, two-phase and three-phase voltages, and realize the zero-penetration voltage falling and the lifting of the single-phase, two-phase and three-phase voltages.
The capacity of the three-phase rectifying unit is 1.5 MW.
The working method of the test platform for high and low voltage ride through comprises the following steps:
step 1: 380V three-phase alternating current is directly taken from the mains supply and is used as an input power supply of the test platform;
step 2: 380V three-phase alternating current is sent into a three-phase rectifying unit through a first circuit breaker, and 690V direct current is obtained through a three-phase controllable rectifying module in the three-phase rectifying unit;
and step 3: 690V direct current is sent into a three-phase controllable inversion unit after coming out of a three-phase rectification unit, the output voltage of the three-phase controllable inversion unit is adjustable, the standard output voltage is alternating current 400V, the three-phase controllable inversion unit realizes single-phase, two-phase and three-phase voltage drop and realizes zero-penetration voltage drop and single-phase, two-phase and three-phase voltage lifting according to the actual test requirement of a test platform, and the voltage drop and lifting time of different amplitudes in different modes is preset according to the standard;
and 4, step 4: the output voltage of the three-phase controllable inversion unit is finally boosted to the input voltage required by the static synchronous compensator STATCOM, the static var generator SVG, the fan frequency converter or the photovoltaic inverter through the step-up transformer, then the voltage is transmitted to the static synchronous compensator STATCOM, the static var generator SVG, the fan frequency converter or the photovoltaic inverter through the second circuit breaker, meanwhile, the leakage inductance of the step-up transformer is used as the input inductance of the static synchronous compensator STATCOM, the static var generator SVG, the fan frequency converter or the photovoltaic inverter by the test platform, the cost is reduced, and the occupied space is reduced.
Compared with the prior art, the invention has the following advantages:
1. the test platform directly takes electricity from 380V, three-level conversion is adopted, and the test requirements of high and low voltage ride through can be met;
2. the test platform utilizes the leakage inductance of the step-up transformer as the input inductance of the SVG, so that the cost and the occupied space can be reduced;
3. the test platform circuit has simple structure and is easy to realize.
Drawings
FIG. 1 is a schematic diagram of a test platform for high and low voltage ride through according to the present invention.
Detailed Description
The invention is described in further detail below with reference to the figures and the detailed description.
As shown in fig. 1, the high and low voltage ride through test platform of the invention is described by taking the high and low voltage ride through test voltages for obtaining a static var generator SVG as an example, and obtains a 3.3kV voltage meeting an SVG test directly from 380V commercial power through three-level transformation; the method comprises the following steps:
1. 380V three-phase alternating current is taken from a mains supply, passes through a first breaker QF and then is sent into a three-phase rectifying unit, 690V direct current is obtained through a three-phase controllable rectifying module, and the capacity of the three-phase controllable rectifying unit is 1.5 MW;
3. the 690V direct current is connected to a 1.5MW output voltage adjustable inverter power supply after coming out of the three-phase rectification unit, and the standard output voltage is alternating current 400 Vac;
4. the inverter power supply realizes single-phase, two-phase and three-phase voltage drop, can realize zero-penetration voltage drop and three-phase voltage rise, the voltage rise or drop amplitude can be set through the liquid crystal screen, and the voltage drop time of different amplitudes in different modes is preset according to related standards;
5. the inverter power supply can simultaneously realize the adaptability test of frequency range fluctuation, the range of voltage frequency output by the inverter power supply can be modified through the liquid crystal screen, and the frequency fluctuation from 47HZ to 53HZ can be realized in real time; the given frequency is set at 60HZ before the inverter power supply is started, so that the output of 400Vac/60HZ voltage of the inverter power supply can be realized, and the frequency adaptability and relevant characteristics of the SVG under 60HZ can be tested;
6. the transformer of 1.5 MW's invertion power supply output back through a transformation ratio 400/3300 is connected to second circuit breaker QF1, and rethread second circuit breaker QF1 is connected to SVG equipment, utilizes the leakage inductance of transformer as the input inductance of SVG, practices thrift equipment and occupation of land space.
Claims (4)
1. A high, low voltage ride through's test platform which characterized in that: the device is used for obtaining high and low voltage ride through test voltages of static synchronous compensator STATCOM, static var generator SVG, fan frequency converter or photovoltaic inverter high-power equipment and comprises a three-phase alternating current power grid, a first circuit breaker, a three-phase rectification unit, a three-phase controllable inversion unit, a step-up transformer unit, a second circuit breaker and a reactive power compensation device SVG; the utility model discloses a three-phase rectifier unit, including test platform, three-phase rectifier unit's input, the output of three-phase rectifier unit is connected with the input of the controllable contravariant unit of three-phase, and the output of the controllable contravariant unit of three-phase is connected with step up transformer's primary side, and step up transformer's secondary side is connected with static synchronous compensator STATCOM, static var generator SVG, fan converter or photovoltaic inverter's input through the second circuit breaker.
2. The test platform for high and low voltage ride through of claim 1, wherein: the three-phase controllable inversion unit can realize the falling of single-phase, two-phase and three-phase voltages, and realize the zero-penetration voltage falling and the lifting of the single-phase, two-phase and three-phase voltages.
3. The test platform for high and low voltage ride through of claim 1, wherein: the capacity of the three-phase rectifying unit is 1.5 MW.
4. A method of operating a test platform for high and low voltage ride through according to any of claims 1 to 3, wherein: the method comprises the following steps:
step 1: 380V three-phase alternating current is directly taken from the mains supply and is used as an input power supply of the test platform;
step 2: 380V three-phase alternating current is sent into a three-phase rectifying unit through a first circuit breaker, and 690V direct current is obtained through a three-phase controllable rectifying module in the three-phase rectifying unit;
and step 3: 690V direct current is sent into a three-phase controllable inversion unit after coming out of a three-phase rectification unit, the output voltage of the three-phase controllable inversion unit is adjustable, the standard output voltage is alternating current 400V, the three-phase controllable inversion unit realizes single-phase, two-phase and three-phase voltage drop and realizes zero-penetration voltage drop and single-phase, two-phase and three-phase voltage lifting according to the actual test requirement of a test platform, and the voltage drop and lifting time of different amplitudes in different modes is preset according to the standard;
and 4, step 4: the output voltage of the three-phase controllable inversion unit is finally boosted to the input voltage required by the static synchronous compensator STATCOM, the static var generator SVG, the fan frequency converter or the photovoltaic inverter through the step-up transformer, then the voltage is transmitted to the static synchronous compensator STATCOM, the static var generator SVG, the fan frequency converter or the photovoltaic inverter through the second circuit breaker, meanwhile, the leakage inductance of the step-up transformer is used as the input inductance of the static synchronous compensator STATCOM, the static var generator SVG, the fan frequency converter or the photovoltaic inverter by the test platform, the cost is reduced, and the occupied space is reduced.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911083341.9A CN110632434A (en) | 2019-11-07 | 2019-11-07 | Test platform for high and low voltage ride through and working method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114200231A (en) * | 2021-12-03 | 2022-03-18 | 国网青海省电力公司电力科学研究院 | Test method for SVG low voltage ride through characteristic |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114200231A (en) * | 2021-12-03 | 2022-03-18 | 国网青海省电力公司电力科学研究院 | Test method for SVG low voltage ride through characteristic |
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