CN114200231A - Test method for SVG low voltage ride through characteristic - Google Patents
Test method for SVG low voltage ride through characteristic Download PDFInfo
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- CN114200231A CN114200231A CN202111469942.0A CN202111469942A CN114200231A CN 114200231 A CN114200231 A CN 114200231A CN 202111469942 A CN202111469942 A CN 202111469942A CN 114200231 A CN114200231 A CN 114200231A
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- 238000010998 test method Methods 0.000 title description 6
- 238000012360 testing method Methods 0.000 claims abstract description 61
- 238000000034 method Methods 0.000 claims abstract description 9
- 238000004088 simulation Methods 0.000 claims abstract description 8
- 238000005259 measurement Methods 0.000 claims abstract description 4
- 238000011161 development Methods 0.000 abstract description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
Abstract
The invention relates to the technical field of electric energy control, in particular to a method for testing the low voltage ride through characteristic of SVG. The technical scheme of the invention is implemented by the following steps: firstly, a low voltage ride through simulation test function is added into a SVG converter control system. And secondly, adding low voltage ride through simulation test parameters into the SVG converter control system. And thirdly, completing the test function and the test parameter correctness test on a test platform of an equipment manufacturer, and having field test conditions. And fourthly, after upgrading the converter control system on the SVG site, testing and recording data. And fifthly, analyzing related active and reactive control characteristics according to the active power and reactive power obtained through actual measurement, and finishing the test book. The invention has the advantages of low test cost, small difficulty and convenient field test development, and can further improve the test convenience by adopting the converter control system to record data.
Description
Technical Field
The invention relates to the technical field of electric energy control, in particular to a method for measuring the low voltage ride through characteristic of SVG.
Background
With the expansion and expansion of new energy power stations, the increase of power grid loads and the improvement of technical strength of equipment manufacturers, the requirement of low-voltage ride through is gradually covered on the SVG equipment, and the SVG equipment is required to play the roles of reactive power support and low-voltage ride through capability during the fault period of the power grid. The most important characteristic of the SVG (static synchronous generator) is the low voltage ride through control characteristic, because the characteristic needs to cause primary voltage drop, the low voltage ride through characteristic test of actual low voltage drop needs to be carried out on a primary system (690V or 35kV) in the prior art, the impedance voltage division principle is utilized, the primary system generates low voltage, the test difficulty and the test cost are high, and the development of field test is hindered. The test is carried out by adopting the low-voltage ride through test device based on impedance partial pressure, and the device has the advantages of large volume and weight, difficulty in transportation and installation, higher use cost and difficulty in application to modeling test.
Disclosure of Invention
The invention aims to provide a test method for SVG low voltage ride through characteristics, so as to solve the problems of low test cost and low difficulty in the background technology. The field test is convenient to develop.
In order to achieve the purpose, the invention provides the following technical scheme: the invention discloses a method for testing the low voltage ride through characteristic of SVG, which comprises the following steps:
step one, adding a low voltage ride through simulation test function in an SVG converter control system: in the normal grid-connected operation process of SVG, Vg_simSetting a fault falling depth range and a fault time range for the simulated voltage falling fault, wherein the fault type of the simulated voltage falling fault is a three-phase fault or a two-phase fault; i isqThe reactive current during low-pass is calculated by the formula Iq＝K×(0.9-Vg_sim) Wherein the K coefficient can be set.
Secondly, adding low voltage ride through simulation test parameters into the SVG converter control system: setting reactive current control coefficient KQ range, and setting reactive current amplitude limit value, active current amplitude limit value and total current amplitude limit value range;
thirdly, testing the correctness of the test function and the test parameters on a test platform of an equipment manufacturer, and having field test conditions;
the fourth step, at the SVG scene, upgrade the back to converter control system, develop the test to adopt the converter to record to test result from the record function of taking or add the record ware, the record data includes: simulating voltage drop (three-phase value), wherein the SVG outputs reactive power and the SVG outputs active power;
and fifthly, analyzing related active and reactive control characteristics according to the active power and reactive power obtained through actual measurement, and completing the test.
The fault falling depth range is set randomly within 20% -90%, and the fault time range is set randomly within 0-2.0 s.
The reactive current control coefficient KQ range is set at will within 0-0.5, and the reactive current amplitude limiting value, the active current amplitude limiting value and the total current amplitude limiting value range are set at will within 80-110%.
Compared with the prior art, the invention has the beneficial effects that:
(1) the low-voltage ride through device does not need to be used for testing on site, so that the cost and the difficulty are greatly reduced;
(2) the converter control system can be used for data recording, and the test convenience can be further improved.
(3) The low-voltage characteristic of the core control characteristic of the SVG can be tested.
Drawings
FIG. 1 is a flow chart of a testing method of the present invention;
FIG. 2 is a functional illustration of an experiment of a current transformer according to the present invention;
FIG. 3 is a comparison of the field test method of the present invention and a conventional test method.
Detailed Description
The invention is further described in the following with reference to the accompanying drawings and examples
As shown in the figure, the invention discloses a test method of SVG low voltage ride through characteristics, which is characterized in that the technical scheme of the invention is implemented by the following steps:
1. adding a low voltage ride through simulation test function into the SVG converter control system: in the normal grid-connected operation process of SVG, Vg_simSetting a fault falling depth range and a fault time range for the simulated voltage falling fault, wherein the fault type is a three-phase fault or a two-phase fault; as shown in FIG. 2, IqThe reactive current during low-pass is calculated by the formula Iq＝K×(0.9-Vg_sim) Wherein the K coefficient can be set.
2. Adding a low voltage ride through simulation test parameter into the SVG converter control system: the reactive current control coefficient KQ range is set at will within 0-0.5, and the reactive current amplitude limit value, the active current amplitude limit value and the total current amplitude limit value range are set at will within 80-110%.
3. The test function and the correctness of the test parameters are tested on a test platform of an equipment manufacturer, and the test platform has field test conditions.
4. At the SVG scene, upgrade the back to converter control system, develop the test to adopt the converter to record to test result from the record function of taking or add the record ware, record data includes: and simulating voltage drop (three-phase value), wherein the SVG outputs reactive power and the SVG outputs active power.
5. The tests were carried out in the order shown in the following table:
| test number | Type of failure | Voltage sag depth | Duration of |
| 1 | Three phases | 20％ | 0.625s |
| 2 | Three phases | 35％ | 1s |
| 3 | Three phases | 50％ | 1.25s |
| 4 | Three phases | 75％ | 1.625s |
| 5 | Three phases | 90％ | 2s |
| 6 | Two phases | 20％ | 0.625s |
| 7 | Two phases | 35％ | 1s |
| 8 | Two phases | 50％ | 1.25s |
| 9 | Two phases | 75％ | 1.625s |
| 10 | Two phases | 90％ | 2s |
6. And analyzing related active and reactive control characteristics according to the active power and reactive power obtained by actual measurement to finish the test.
Claims (3)
1. The invention discloses a method for testing the low voltage ride through characteristic of SVG, which is characterized in that the technical scheme of the invention comprises the following steps:
step one, adding a low voltage ride through simulation test function in an SVG converter control system: in the normal grid-connected operation process of the SVG, simulating the three-phase/two-phase fault type of the measured voltage, setting a fault falling depth range and setting a fault time range;
secondly, adding low voltage ride through simulation test parameters into the SVG converter control system: setting reactive current control coefficient KQ range, and setting reactive current amplitude limit value, active current amplitude limit value and total current amplitude limit value range;
thirdly, testing the correctness of the test function and the test parameters on a test platform of an equipment manufacturer, and having field test conditions;
the fourth step, at the SVG scene, upgrade the back to converter control system, develop the test to adopt the converter to record to test result from the record function of taking or add the record ware, the record data includes: simulating voltage drop (three-phase value), wherein the SVG outputs reactive power and the SVG outputs active power;
and fifthly, analyzing related active and reactive control characteristics according to the active power and reactive power obtained through actual measurement, and completing the test.
2. The method for testing the low voltage ride-through characteristics of the SVG according to claim 1, wherein said fault dip depth range is arbitrarily set within 20% -90%, and said fault time range is arbitrarily set within 0-2.0 s.
3. The method for testing the low voltage ride-through characteristics of the SVG according to claim 1, wherein said reactive current control coefficient KQ is arbitrarily set within the range of 0-0.5, and the reactive current limiting value, the active current limiting value and the total current limiting value are arbitrarily set within the range of 80% -110%.
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- 2021-12-03 CN CN202111469942.0A patent/CN114200231A/en active Pending
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