CN104360179A - Test system for simulating converter transformer direct-current magnetic bias - Google Patents
Test system for simulating converter transformer direct-current magnetic bias Download PDFInfo
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- CN104360179A CN104360179A CN201410299589.XA CN201410299589A CN104360179A CN 104360179 A CN104360179 A CN 104360179A CN 201410299589 A CN201410299589 A CN 201410299589A CN 104360179 A CN104360179 A CN 104360179A
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- magnetic bias
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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
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- Testing Electric Properties And Detecting Electric Faults (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The invention discloses a test system for simulating the converter transformer direct-current magnetic bias. The test system includes a simulating system of a real time digital system (RTDS) of a direct current transmission system, the simulating system is used for simulating the converter transformer direct-current magnetic bias operation conditions, and the RTDS simulating system is connected to a RTDS real-time digital simulator and a circulation transformer protection device; a magnetic bias resistor is connected between a neutral point of a star converter transformer of a single/dual low-end valve group and a direct current grounding electrode serially. Since the magnetic bias resistor is connected between the neutral point of the star converter transformer of the single/dual low-end valve group and the direct current grounding electrode serially, the direct current of the grounding electrode is guided into the neutral point of a Yn/Y converter transformer so as to simulate the magnetic bias when the conversion current is converted into the direct current since the direct current invades the converter transformer according to an actual direct current transmission system; the device is simple and reliable to implement when being used for simulating the converter transformer direct-current magnetic bias, the implementation requirement is low, and the popularization value is high.
Description
Technical field
The present invention relates to a kind of test macro for simulating converter transformer DC magnetic bias and method.
Background technology
In recent years, extra-high voltage DC transmission system is swift and violent in China's development.Along with being in succession constructed and put into operation of HVDC (High Voltage Direct Current) transmission system, thereupon also create many problems.DC power transmission line usually can first be built up one pole at initial operating stage and put into operation, just can complete bipolar operation afterwards, and when breaking down, for preventing line outage from affecting greatly, the mode of monopolar operation also can be adopted to continue transmission of electric energy.When DC transmission system is run in one pole the earth mode, certain DC current that makes larger earth current flows through converter power transformer neutral point or converter power transformer winding, cause DC magnetic biasing, cause transformer core saturated, make it work in the nonlinear area of core sataration curve, cause transformer magnetizing current to distort in half wave cycles.
As shown in Figure 1, in figure, i is exciting current size,
for the magnetic flux in magnetic circuit, in figure, solid line is the phase voltage of neutral point when not adding DC voltage, dotted line is the phase voltage after superposition one forward dc voltage, because phase voltage is linear with the magnetic flux in every phase magnetic circuit, so the ordinate in Fig. 1 is directly written as every phase magnetic flux
to under DC magnetic biasing excitation current waveform carry out analysis and can find, at negative half period, DC component is contrary with alternating voltage direction, and now magnetic flux reduces, and degree of saturation is little or do not have saturated, and negative half period waveform can be regarded as sine wave.At positive half cycle, DC voltage is identical with interchange direction, and superposition makes magnetic flux increase mutually, and degree of saturation is comparatively dark, thus makes positive half cycle present peaked wave.
During convertor transformer generation DC magnetic biasing, if do not take certain braking measure, converter power transformer may be affected and normally run the stable transfer with DC transmission system DC power, the stable operation of entail dangers to straight-flow system and the safety of electrical network time serious.Recent year has a large amount of high voltage direct current transmission project to build up to put into operation, and the impact of the DC magnetic biasing of its converter power transformer will be more obvious, and therefore, the analysis and research of converter transformer DC magnetic bias seem more urgent.
At present, the main method of research converter transformer DC magnetic bias injects certain DC current to simulate at the neutral point of converter power transformer the DC component flowing through converter power transformer, and the method is used for studying the situation that single transformer or the identical transformers connected in parallel of multiple stage model parameter run.
Become neutral point at star in change of current change protective device in DC transmission system and be configured with the saturated protection of direct current; be used for specially reacting the DC magnetic bias phenomena of converter power transformer; but star becomes not identical with the DC current experienced of star angle change neutral point in systems in practice; therefore the method injecting certain DC current to simulate the DC component flowing through converter power transformer at the neutral point of converter power transformer is not very flexible, and simulation star of having no idea becomes and star angle becomes the inconsistent of neutral point direct current.
Summary of the invention
The object of this invention is to provide a kind of test macro for simulating converter transformer DC magnetic bias, cannot the problem of realistic simulation DC current to solve existing test macro.
In order to realize above object, the technical solution adopted in the present invention is: a kind of test macro for simulating converter transformer DC magnetic bias, comprise the DC transmission system RTDS analogue system for simulating converter transformer DC magnetic bias operating condition, described RTDS analogue system is connected with RTDS Real Time Digital Simulator and circulation protection equipment for transformer; This RTDS analogue system be every grade by two 12 pulse conversion devices single-stage in series or bipolar direct current transmission system, two corresponding 12 pulse conversion devices form the high end valve group of each grade and low end valve group respectively, are in series with a magnetic bias resistance between the star converter power transformer neutral point of single-stage and/or bipolar low end valve group and direct current grounding pole.
Described RTDS analogue system to be connected the state quantity signal for providing voltage, current signal and tap gear needed for it respectively by GT series interfaces board and power amplifier with circulation protection equipment for transformer, converter transformer protector by trip protection and alarm signal feed back input to RTDS analogue system.
The value of described magnetic bias resistance is determined by measured data matching: when DC transmission system one pole the earth runs, in different transmission power situation, flow through the actual DC electric current of converter power transformer, matching is carried out to resistance value, the actual distribution of DC current in actual DC transmission system can be reflected.
The present invention sets up the DC transmission system RTDS analogue system that can reflect converter transformer DC magnetic bias operating condition for the test macro of simulating converter transformer DC magnetic bias, this analogue system adopts every grade by two 12 pulse conversion devices single-stage in series or bipolar direct current transmission system, two corresponding 12 pulse conversion devices form the high end valve group of each grade and low end valve group respectively, by at the star converter power transformer neutral point of single-stage and/or bipolar low end valve group and magnetic bias resistance of connecting between direct current grounding pole, earthing pole DC current is introduced Yn/Y converter power transformer neutral point to come in artificial actual DC transmission system because DC current invades the change of current inversion of direct current bias phenomenon that converter power transformer causes.This device implementation method when being used for simulation converter transformer DC magnetic bias is simple, reliable, realizes threshold lower, has high promotional value.
Accompanying drawing explanation
Fig. 1 is converter transformer DC magnetic bias schematic diagram of the present invention;
Fig. 2 is the test macro schematic diagram that RTDS of the present invention tests;
Fig. 3 is test macro analog DC magnetic bias schematic diagram of the present invention.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment, the present invention is described further.
Be illustrated in figure 2 the present invention for simulating the schematic diagram of the test macro embodiment of converter transformer DC magnetic bias, as seen from the figure, this system comprises the DC transmission system RTDS analogue system for simulating converter transformer DC magnetic bias operating condition, and RTDS analogue system is connected with RTDS Real Time Digital Simulator and circulation protection equipment for transformer; This RTDS analogue system be every grade by two 12 pulse conversion devices single-stage in series or bipolar direct current transmission system, two corresponding 12 pulse conversion devices form the high end valve group of each grade and low end valve group respectively, a magnetic bias resistance is in series with, as shown in Figure 3 between the star converter power transformer neutral point of single-stage and/or bipolar low end valve group and direct current grounding pole.
RTDS analogue system to be connected the state quantity signal for providing voltage, current signal and tap gear needed for it respectively by GT series interfaces board and power amplifier with circulation protection equipment for transformer, converter transformer protector by trip protection and alarm signal feed back input to RTDS analogue system.
As shown in Figure 3, in RTDS analogue system, the converter power transformer of low end valve group forms Single Phase Transformer Set by three single transformers, earthing pole DC current being introduced Yn/Y converter power transformer neutral point comes because of the change of current inversion of direct current bias phenomenon that DC current intrusion converter power transformer causes in artificial actual DC transmission system, and concrete methods of realizing is by becoming a series connection resistance R between neutral point and direct current grounding pole in the Yn/Y change of current.The value of this resistance R is determined by field measurement data fitting, namely when record DC transmission system one pole the earth runs, in different transmission power situation, flow through the actual DC electric current of converter power transformer, matching is carried out to resistance value, the actual distribution of DC current in actual DC transmission system can be reflected.
The present invention is as follows for the test process of the test macro of simulating converter transformer DC magnetic bias: (1) sets up two 12 pulse conversion valve group RTDS analogue systems of extra-high voltage DC transmission system, and converter power transformer and the outside ac and dc systems connected thereof are simulated in RTDS Real Time Digital Simulator; Converter power transformer forms Single Phase Transformer Set by single transformer, RTDS analogue system becomes protective device by GT series interfaces board with power amplifier and the change of current and is connected, the quantity of states such as voltage, current signal and the tap gear that in RTDS Real Time Digital Simulator, converter power transformer protection is relevant are provided to it, trip protection and alarm signal are then turned back to RTDS analogue system by converter transformer protector, form a real-time closed-loop test system, meet the requirement of converter power transformer protection RTDS closed test; (2) a series connection resistance R between neutral point and direct current grounding pole is become in the Yn/Y change of current, earthing pole DC current is introduced Yn/Y converter power transformer neutral point, for simulating because of the change of current inversion of direct current bias phenomenon that DC current intrusion converter power transformer causes in actual DC transmission system, the value of this resistance R can be determined according to table one.
Current conversion station transformer testing data during certain extra-high voltage direct-current engineering pole 1 monopolar operation of table one
As seen from the above table, according to field data, there is provided 1000A DC current at pole 1 low side, the high end valve group in pole 1 is in blocking, but the AC circuit breaker of pole 1 high end valve group is in lower of closure state and provides the DC current substantially identical with scene, the resistance value of required magnetic bias resistance is 12 Ω.
Above embodiment only understands core concept of the present invention for helping; the present invention can not be limited with this; for those skilled in the art; every according to thought of the present invention; the present invention is modified or equivalent replacement; any change done in specific embodiments and applications, all should be included within protection scope of the present invention.
Claims (3)
1. one kind for simulating the test macro of converter transformer DC magnetic bias, it is characterized in that: comprise the DC transmission system RTDS analogue system for simulating converter transformer DC magnetic bias operating condition, described RTDS analogue system is connected with RTDS Real Time Digital Simulator and circulation protection equipment for transformer; This RTDS analogue system be every grade by two 12 pulse conversion devices single-stage in series or bipolar direct current transmission system, two corresponding 12 pulse conversion devices form the high end valve group of each grade and low end valve group respectively, are in series with a magnetic bias resistance between the star converter power transformer neutral point of single-stage and/or bipolar low end valve group and direct current grounding pole.
2. the test macro for simulating converter transformer DC magnetic bias according to claim 1; it is characterized in that: described RTDS analogue system to be connected the state quantity signal for providing voltage, current signal and tap gear needed for it respectively by GT series interfaces board and power amplifier with circulation protection equipment for transformer, converter transformer protector by trip protection and alarm signal feed back input to RTDS analogue system.
3. the test macro for simulating converter transformer DC magnetic bias according to claim 1, it is characterized in that, the value of described magnetic bias resistance is determined by measured data matching: when DC transmission system one pole the earth runs, in different transmission power situation, flow through the actual DC electric current of converter power transformer, matching is carried out to resistance value, the actual distribution of DC current in actual DC transmission system can be reflected.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410299589.XA CN104360179A (en) | 2014-06-26 | 2014-06-26 | Test system for simulating converter transformer direct-current magnetic bias |
| PCT/CN2014/093376 WO2015196747A1 (en) | 2014-06-26 | 2014-12-09 | Test system for simulating direct-current bias of converter transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410299589.XA CN104360179A (en) | 2014-06-26 | 2014-06-26 | Test system for simulating converter transformer direct-current magnetic bias |
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| CN104360179A true CN104360179A (en) | 2015-02-18 |
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| CN201410299589.XA Pending CN104360179A (en) | 2014-06-26 | 2014-06-26 | Test system for simulating converter transformer direct-current magnetic bias |
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| CN (1) | CN104360179A (en) |
| WO (1) | WO2015196747A1 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105467241A (en) * | 2015-12-08 | 2016-04-06 | 国家电网公司 | A distributed converter transformer direct current bias detection system and a detection method thereof |
| CN108008641A (en) * | 2017-11-27 | 2018-05-08 | 华北电力科学研究院有限责任公司 | Generator-transformer protection device performance detecting system and method |
| CN113447734A (en) * | 2020-03-25 | 2021-09-28 | 许继集团有限公司 | DC magnetic bias injection test device |
| CN113589088A (en) * | 2021-08-27 | 2021-11-02 | 广东电网有限责任公司 | Method and device for determining harmonic suppression effect of flexible direct current transmission system |
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| CN107102567B (en) * | 2017-06-12 | 2023-03-17 | 南方电网科学研究院有限责任公司 | Simulation test system and test method |
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| CN108169606A (en) * | 2018-03-12 | 2018-06-15 | 云南送变电工程有限公司 | High voltage direct current converter system simulates live detection complexes and its detection method |
| CN109299564B (en) * | 2018-10-19 | 2023-04-07 | 国家电网有限公司 | Correction method for temperature factor influence in transformer bias current simulation calculation process |
| CN109697327B (en) * | 2018-12-29 | 2022-09-20 | 合肥工业大学 | Reliability and sensitivity analysis method for converter unit in extra-high voltage direct current transmission system |
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| CN113675820B (en) * | 2021-07-16 | 2024-02-13 | 国网浙江省电力有限公司杭州供电公司 | Emergency control method for coping with DC magnetic bias of transformer |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105467241A (en) * | 2015-12-08 | 2016-04-06 | 国家电网公司 | A distributed converter transformer direct current bias detection system and a detection method thereof |
| CN105467241B (en) * | 2015-12-08 | 2018-04-13 | 国家电网公司 | A kind of distribution converter transformer DC magnetic bias detecting system and its detection method |
| CN108008641A (en) * | 2017-11-27 | 2018-05-08 | 华北电力科学研究院有限责任公司 | Generator-transformer protection device performance detecting system and method |
| CN108008641B (en) * | 2017-11-27 | 2021-02-05 | 华北电力科学研究院有限责任公司 | Performance detection system and method for generator transformer bank protection device |
| CN113447734A (en) * | 2020-03-25 | 2021-09-28 | 许继集团有限公司 | DC magnetic bias injection test device |
| CN113447734B (en) * | 2020-03-25 | 2024-04-12 | 许继集团有限公司 | DC magnetic bias current injection test device |
| CN113589088A (en) * | 2021-08-27 | 2021-11-02 | 广东电网有限责任公司 | Method and device for determining harmonic suppression effect of flexible direct current transmission system |
| CN113589088B (en) * | 2021-08-27 | 2023-05-30 | 广东电网有限责任公司 | Method and device for determining harmonic suppression effect of flexible direct current transmission system |
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|---|---|
| WO2015196747A1 (en) | 2015-12-30 |
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Application publication date: 20150218 |