CN109490656A - UPFC power module appraisal procedure based on shutdown induced voltage negative peak - Google Patents
UPFC power module appraisal procedure based on shutdown induced voltage negative peak Download PDFInfo
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- CN109490656A CN109490656A CN201811061090.XA CN201811061090A CN109490656A CN 109490656 A CN109490656 A CN 109490656A CN 201811061090 A CN201811061090 A CN 201811061090A CN 109490656 A CN109490656 A CN 109490656A
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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Abstract
The present invention relates to a kind of UPFC power module appraisal procedures based on shutdown induced voltage negative peak, belong to Power System Flexible UHV AC transmission technique field.The method steps are as follows, and 1) acquisition upper tube shutdown induced voltage；2) shutdown induced voltage negative peak is calculated；3) all off induced voltage negative peak is obtained；4) the shutdown induced voltage negative peak of the upper tube of each submodule of bridge arm is obtained；5) all off induced voltage negative peak is ranked up from small to large, calculates the average value of top n shutdown induced voltage negative peak；6) mean square deviation of rear N number of shutdown induced voltage negative peak and average value is calculated separately；7) by the maximum mean square deviation in mean square deviation compared with setting value, whether judging submodule is in sub-health state；8) according to the health status information of submodule, to do status assessment to UPFC power module.This method is the state evaluating method of UPFC power module dynamic parameter；Measurement is simple, is easily achieved；State accuracy of judgement.
Description
Technical field
The present invention relates to a kind of UPFC power module appraisal procedures based on shutdown induced voltage negative peak, belong to power train
System flexible ac transmission technology field.
Background technique
On December 11st, 2015, the western looped network in 220 kilovolts of the great science and technology demonstration project of State Grid Corporation of China --- Nanjing
THE UPFC (unified power flow controller, UPFC) engineering smoothly puts into operation, and is that China is first certainly
The UPFC engineering of main intellectual property, use modularization multi-level converter (modular multilevel converter,
MMC) technology substantially increases China's flexible ac transmission technology.
Core is divided into insulated gate bipolar transistor (insulated gate bipolar in above-mentioned UPFC
Transistor, IGBT) power module, the operating status of IGBT power module will directly influence UPFC system stability with
And reliability.Therefore, system reliability will be enhanced by carrying out real-time monitoring and status assessment to power module in UPFC system, be reduced
Because of IGBT failure bring harm, economic loss caused by UPFC damage is reduced.
Common measurement method is classified according to the physical characteristics of realization, can be roughly divided into four classes: physical contact method,
Optical method, temperature sensitive parametric method and thermo network.Compare other measurement methods, temperature sensitive electrical parameter method is easy to operate by its, application
At low cost, fast response time has obtained domestic and foreign scholars and has studied extensively.
Temperature sensitive electrical parameter method is concentrated mainly on the research of static parameter and offline correction aspect, shorter mention dynamic at present
The exploration of parameter.However in UPFC power module the switch time of IGBT differed within the scope of several hundred ns to several us, extremely short
Rapid survey is carried out to the dynamic changes of electric current and voltage in switch time, there is very big challenge.
Summary of the invention
The technical problem to be solved by the present invention is in view of the shortcomings of the prior art, propose a kind of based on IGBT shutdown induced electricity
The UPFC power module appraisal procedure of negative peak is pressed, UPFC power module health state evaluation is realized, finds UPFC engineering in time
The IGBT power module of middle inferior health.
In order to solve the above-mentioned technical problem technical solution that the present invention proposes is: one kind is based on shutdown induced voltage negative peak
UPFC power module appraisal procedure, execute following steps:
1) upper tube for acquiring the submodule of the fast upper bridge arm of the UPFC power mould turns off induced voltage；
2) the shutdown induced voltage negative peak that calculation of lightning induced voltage goes out corresponding upper tube is turned off by the upper tube acquired in step 1)；
3) step 1) and step 2 are repeated after N number of period, obtains the shutdown induced electricity of the upper tube of each submodule of bridge arm
Press negative peak；
4) by step 1), step 2 and step 3) it is same in a manner of the available each submodule of UPFC functional module lower bridge arm
The shutdown induced voltage negative peak of upper tube；
5) whole 2N shutdown induced voltage negative peaks are ranked up from small to large, calculate top n and turns off induced voltage negative peak
The average value of value；
6) mean square deviation of average value obtained in rear N number of shutdown induced voltage negative peak and step 5) is calculated separately；
7) by the maximum mean square deviation in mean square deviation compared with setting value, if maximum mean square deviation is greater than the set value, maximum mean square deviation
Corresponding submodule is in sub-health state；
8) according to the health status information of submodule, to complete the status assessment of UPFC power module.
The improvement of above-mentioned technical proposal is: each submodule upper tube that step 1) need to meet bridge arm on UPFC power module is driven
Dynamic signal is high level, the upper tube shutdown of first submodule of subsequent time, at this time can shutdown induced electricity to the upper tube
Pressure is acquired.
The improvement of above-mentioned technical proposal is: step 2 by differential or size compare in the way of to obtain shutdown induced voltage negative
Peak value.
The beneficial effect of the present invention by adopting the above technical scheme is: the present invention is carried out using UPFC power module dynamic parameter
Status assessment realizes the dynamic evaluation of UPFC power module, can find inferior health IGBT in UPFC engineering in first time
Power module.And this method mode getparms is simple, it is easy to accomplish, and can accurate UPFC power module state
Judged.
Detailed description of the invention
The present invention will be further explained below with reference to the attached drawings.
Fig. 1 is the process of the UPFC power module appraisal procedure based on shutdown induced voltage negative peak of the embodiment of the present invention
Schematic diagram.
Fig. 2 is UPFC structural topology figure.
Fig. 3 is the MMC topological structure that UPFC power module uses.
Specific embodiment
Embodiment
A kind of UPFC power module appraisal procedure based on shutdown induced voltage negative peak of the present embodiment, executes following step
It is rapid:
1) upper tube for acquiring the submodule of the fast upper bridge arm of the UPFC power mould turns off induced voltage；Step 1) need to meet UPFC
Each submodule upper tube driving signal of bridge arm is high level on power module, and the upper tube of first submodule of subsequent time is closed
It is disconnected, at this time can the shutdown induced voltage to the upper tube be acquired；
2) the shutdown induced voltage negative peak that calculation of lightning induced voltage goes out corresponding upper tube is turned off by the upper tube acquired in step 1)V eE_NP ；Step 2 by differential or size compare in the way of obtain shutdown induced voltage negative peak;
3) step 1) and step 2 are repeated after N number of period, obtains the shutdown induced electricity of the upper tube of each submodule of bridge arm
Press negative peak；
4) by step 1), step 2 and step 3) it is same in a manner of the available each submodule of UPFC functional module lower bridge arm
The shutdown induced voltage negative peak of upper tube；
5) whole 2N shutdown induced voltage negative peaks are ranked up from small to large, calculate top n and turns off induced voltage negative peak
The average value of value；
6) mean square deviation of average value obtained in rear N number of shutdown induced voltage negative peak and step 5) is calculated separately；
7) by the maximum mean square deviation in variance compared with setting value, if maximum mean square deviation is greater than the set value, maximum mean square deviation institute
Corresponding submodule is in sub-health state；
8) according to the health status information of submodule, to complete the status assessment of UPFC power module.
Such as Fig. 2, UPFC structural topology figure, UPFC includes series transformer, shunt transformer, series power module, parallel connection
Power module, monitoring and control unit；Series transformer pair side is serially connected between external communication power grid 1,2, and the change joins transformation
Device pair side is parallel to 1 side of external communication power grid；Series power module exchange side is connected with series transformer primary side, parallel power
Module exchange side is connected with shunt transformer primary side；Series power module DC side and the parallel power module DC side phase
Even；It is monitoring and control unit acquisition series power module and the three-phase alternating voltage of parallel power module, three-phase alternating current, straight
Galvanic electricity pressure, shutdown induced voltage, temperature signal, control the IGBT switch motion of series power module and parallel power module.
The MMC topological structure used such as Fig. 3, UPFC power module；UPFC power module includes parallel power module and string
Join power module, parallel power module and series power module respectively include the upper and lower bridge arm of three-phase symmetrical, and upper and lower bridge arm respectively wraps
N number of submodule is included, concatenates bridge arm inductance between upper bridge arm submodule and lower bridge arm submodule.
The present invention is not limited to the above embodiment.All technical solutions formed using equivalent replacement, are all fallen within the present invention and wanted
The protection scope asked.
Claims (3)
1. the UPFC power module appraisal procedure based on shutdown induced voltage negative peak, it is characterised in that execute following steps:
1) upper tube for acquiring the submodule of the fast upper bridge arm of the UPFC power mould turns off induced voltage；
2) the shutdown induced voltage negative peak that calculation of lightning induced voltage goes out corresponding upper tube is turned off by the upper tube acquired in step 1)；
3) step 1) and step 2 are repeated after N number of period, obtains the shutdown induced electricity of the upper tube of each submodule of bridge arm
Press negative peak；
4) by step 1), step 2 and step 3) it is same in a manner of the available each submodule of UPFC functional module lower bridge arm
The shutdown induced voltage negative peak of upper tube；
5) whole 2N shutdown induced voltage negative peaks are ranked up from small to large, calculate top n and turns off induced voltage negative peak
The average value of value；
6) mean square deviation of average value obtained in rear N number of shutdown induced voltage negative peak and step 5) is calculated separately；
7) by the maximum mean square deviation in mean square deviation compared with setting value, if maximum mean square deviation is greater than the set value, maximum mean square deviation
Corresponding submodule is in sub-health state；
8) according to the health status information of submodule, to complete the status assessment of UPFC power module.
2. the UPFC power module appraisal procedure according to claim 1 based on shutdown induced voltage negative peak, feature
Be: it is high level that step 1), which need to meet each submodule upper tube driving signal of bridge arm on UPFC power module, lower a period of time
Carve first submodule upper tube shutdown, at this time can the shutdown induced voltage to the upper tube be acquired.
3. the UPFC power module appraisal procedure according to claim 1 based on shutdown induced voltage negative peak, feature
Be: step 2 by differential or size compare in the way of obtain shutdown induced voltage negative peak.
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| CN103954866A (en) * | 2014-05-09 | 2014-07-30 | 国家电网公司 | Testing circuit of half-bridge-structure voltage source current converter and modulation method thereof |
| WO2015135352A1 (en) * | 2014-03-13 | 2015-09-17 | 国家电网公司 | Dc fault ride-through control method of hybrid modular multilevel converter |
| CN105553310A (en) * | 2015-12-31 | 2016-05-04 | 湖南大学 | Low-modulation-index control method for modular multi-level current converter |
| CN107222118A (en) * | 2017-08-10 | 2017-09-29 | 国网江苏省电力公司南京供电公司 | A kind of UPFC controllers and its control method based on observer and MMC |
| CN107425745A (en) * | 2017-08-10 | 2017-12-01 | 国网江苏省电力公司南京供电公司 | A kind of UPFC control systems and its control method based on observer and MMC |
| CN108039830A (en) * | 2017-12-25 | 2018-05-15 | 杭州电子科技大学 | A kind of full rank submodule voltage status observation procedures of MMC |
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2018
- 2018-09-12 CN CN201811061090.XA patent/CN109490656B/en active Active
Patent Citations (6)
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|---|---|---|---|---|
| WO2015135352A1 (en) * | 2014-03-13 | 2015-09-17 | 国家电网公司 | Dc fault ride-through control method of hybrid modular multilevel converter |
| CN103954866A (en) * | 2014-05-09 | 2014-07-30 | 国家电网公司 | Testing circuit of half-bridge-structure voltage source current converter and modulation method thereof |
| CN105553310A (en) * | 2015-12-31 | 2016-05-04 | 湖南大学 | Low-modulation-index control method for modular multi-level current converter |
| CN107222118A (en) * | 2017-08-10 | 2017-09-29 | 国网江苏省电力公司南京供电公司 | A kind of UPFC controllers and its control method based on observer and MMC |
| CN107425745A (en) * | 2017-08-10 | 2017-12-01 | 国网江苏省电力公司南京供电公司 | A kind of UPFC control systems and its control method based on observer and MMC |
| CN108039830A (en) * | 2017-12-25 | 2018-05-15 | 杭州电子科技大学 | A kind of full rank submodule voltage status observation procedures of MMC |
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| 吕航 等: "基于子模块电压估算的UPFC***故障诊断方法", 《电力电子技术》 * |
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