CN109490656B - UPFC power module evaluation method based on turn-off induced voltage negative peak value - Google Patents
UPFC power module evaluation method based on turn-off induced voltage negative peak value Download PDFInfo
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Abstract
The invention relates to a UPFC power module evaluation method based on a turn-off induction voltage negative peak value, and belongs to the technical field of flexible alternating current transmission of a power system. The method comprises the following steps of 1) collecting the upper tube cut-off induction voltage; 2) Calculating a negative peak value of the turn-off induction voltage; 3) Obtaining all the negative peak values of the turn-off induction voltage; 4) Obtaining the turn-off induction voltage negative peak value of the upper tube of each sub-module of the upper bridge arm; 5) Sequencing all the turn-off induction voltage negative peak values from small to large, and calculating the average value of the first N turn-off induction voltage negative peak values; 6) Respectively calculating the mean square deviation of the negative peak value and the average value of the N switched-off induction voltages; 7) Comparing the maximum mean square error in the mean square errors with a set value, and judging whether the sub-module is in a sub-health state; 8) And performing state evaluation on the UPFC power module according to the health state information of the sub-modules. The method is a state evaluation method of dynamic parameters of a UPFC power module; the measurement is simple and easy to realize; and the state judgment is accurate.
Description
Technical Field
The invention relates to a UPFC power module evaluation method based on a turn-off induction voltage negative peak value, and belongs to the technical field of flexible alternating current transmission of a power system.
Background
11 days 12 and 11 months 2015, a major scientific and technological demonstration project of national grid company, namely a Unified Power Flow Controller (UPFC) project of 220 kv west ring network in south kyoto of Jiangsu, is successfully put into operation, is the UPFC project of the first independent intellectual property right in China, adopts a Modular Multilevel Converter (MMC) technology, and greatly improves the flexible alternating current transmission technology in China.
The core part of the UPFC is an Insulated Gate Bipolar Transistor (IGBT) power module, and the operating state of the IGBT power module directly affects the stability and reliability of the UPFC system. Therefore, real-time monitoring and state evaluation of the power module in the UPFC system can enhance the system reliability, reduce the damage caused by IGBT failure and reduce the economic loss caused by UPFC damage.
Common measurement methods are classified according to the physical characteristics achieved, and can be roughly classified into four categories: physical contact methods, optical methods, temperature-sensitive parameter methods, and thermal networking methods. Compared with other measuring methods, the temperature-sensitive electrical parameter method is widely researched by domestic and foreign scholars due to the advantages of simple operation, low application cost and high response speed.
At present, the temperature-sensitive electrical parameter sensing method mainly focuses on the research of static parameters and off-line correction, and less relates to the exploration of dynamic parameters. However, the switching time of the IGBT in the UPFC power module varies from several hundred ns to several us, and it is very challenging to quickly measure the dynamic change of the current and the voltage in an extremely short switching time.
Disclosure of Invention
The invention aims to solve the technical problem that aiming at the defects in the prior art, the invention provides a UPFC power module evaluation method based on the negative peak value of the IGBT turn-off induction voltage, which is used for realizing the health state evaluation of the UPFC power module and timely discovering sub-healthy IGBT power modules in UPFC engineering.
The technical scheme provided by the invention for solving the technical problems is as follows: a UPFC power module evaluation method based on a negative peak value of a turn-off induced voltage executes the following steps:
1) Collecting upper tube turn-off induction voltage of a sub-module of an upper bridge arm of the UPFC power module;
2) Calculating a turn-off induction voltage negative peak value corresponding to the upper tube according to the upper tube turn-off induction voltage collected in the step 1);
3) Repeating the step 1) and the step 2) for N periods to obtain the turn-off induction voltage negative peak value of the upper tube of each submodule of the upper bridge arm;
4) Obtaining the turn-off induction voltage negative peak value of the upper tube of each sub-module of the lower bridge arm of the UPFC functional module in the same manner of the step 1), the step 2) and the step 3);
5) Sequencing all 2N turn-off induction voltage negative peak values from small to large, and calculating the average value of the first N turn-off induction voltage negative peak values;
6) Respectively calculating the mean square deviation of the negative peak values of the N switched-off induction voltages and the average value obtained in the step 5);
7) Comparing the maximum mean square deviation in the mean square deviations with a set value, and if the maximum mean square deviation is larger than the set value, enabling the sub-module corresponding to the maximum mean square deviation to be in a sub-health state;
8) And according to the health state information of the sub-modules, completing the state evaluation of the UPFC power module.
The improvement of the technical scheme is as follows: step 1) it needs to be satisfied that the upper tube driving signal of each sub-module of the upper bridge arm of the UPFC power module is high level, the upper tube of the first sub-module is turned off at the next moment, and at this moment, the turn-off induction voltage of the upper tube can be collected.
The improvement of the technical scheme is as follows: and 2) obtaining the negative peak value of the turn-off induction voltage by using a differentiation or magnitude comparison mode.
The invention adopts the technical scheme that the beneficial effects are as follows: according to the invention, the dynamic parameters of the UPFC power module are utilized to carry out state evaluation, so that the dynamic evaluation of the UPFC power module is realized, and the sub-health IGBT power module in the UPFC engineering can be found at the first time. The method for acquiring the parameters is simple and easy to realize, and the state of the UPFC power module can be accurately judged.
Drawings
The invention will be further described with reference to the accompanying drawings.
Fig. 1 is a schematic flow chart of a method for evaluating a UPFC power module based on a negative peak of an off-state induced voltage according to an embodiment of the present invention.
Fig. 2 is a UPFC fabric topology.
Fig. 3 is an MMC topology employed by a UPFC power module.
Detailed Description
Examples
In this embodiment, a method for evaluating a UPFC power module based on a negative peak of an off-state induced voltage includes the following steps:
1) Collecting upper tube turn-off induction voltage of a submodule of an upper bridge arm of the UPFC power module; step 1) the condition that the upper tube driving signal of each sub-module of an upper bridge arm of a UPFC power module is high level is required to be met, the upper tube of the first sub-module is turned off at the next moment, and the turn-off induction voltage of the upper tube can be collected at the moment;
2) Calculating the turn-off induction voltage negative peak value of the corresponding upper tube according to the turn-off induction voltage of the upper tube collected in the step 1)V eE_NP (ii) a Step 2) obtaining a negative peak value of the turn-off induction voltage by means of differentiation or magnitude comparison;
3) Repeating the step 1) and the step 2) for N periods to obtain the turn-off induction voltage negative peak value of the upper tube of each submodule of the upper bridge arm;
4) Obtaining the turn-off induction voltage negative peak value of the upper tube of each sub-module of the lower bridge arm of the UPFC functional module in the same way as the step 1), the step 2) and the step 3);
5) Sequencing all 2N turn-off induction voltage negative peak values from small to large, and calculating the average value of the first N turn-off induction voltage negative peak values;
6) Respectively calculating the mean square deviation of the negative peak values of the N switched-off induction voltages and the average value obtained in the step 5);
7) Comparing the maximum mean square error in the variances with a set value, and if the maximum mean square error is larger than the set value, enabling the sub-module corresponding to the maximum mean square error to be in a sub-health state;
8) And according to the health state information of the sub-modules, completing the state evaluation of the UPFC power module.
As shown in fig. 2, the UPFC structure topology diagram includes a series transformer, a parallel transformer, a series power module, a parallel power module, and a monitoring and control unit; the secondary side of the series transformer is connected between the external alternating current power grids 1 and 2 in series, and the secondary side of the variable transformer is connected to one side of the external alternating current power grid 1 in parallel; the AC side of the series power module is connected with the primary side of the series transformer, and the AC side of the parallel power module is connected with the primary side of the parallel transformer; the direct current side of the series power module is connected with the direct current side of the parallel power module; the monitoring and control unit collects three-phase alternating current voltage, three-phase alternating current, direct current voltage, turn-off induction voltage and temperature signals of the series power module and the parallel power module and controls the IGBT switch action of the series power module and the parallel power module.
As in fig. 3, MMC topology employed by the upfc power module; the UPFC power module comprises a parallel power module and a series power module, the parallel power module and the series power module respectively comprise three upper bridge arms and three lower bridge arms which are relatively symmetrical, each of the upper bridge arm and the lower bridge arm comprises N sub-modules, and bridge arm inductors are connected between the upper bridge arm sub-modules and the lower bridge arm sub-modules in series.
The present invention is not limited to the above-described embodiments. All technical solutions formed by equivalent substitutions fall within the protection scope of the claims of the present invention.
Claims (2)
1. The UPFC power module evaluation method based on the negative peak value of the turn-off induced voltage is characterized by comprising the following steps of:
1) Collecting upper tube turn-off induction voltage of a submodule of an upper bridge arm of the UPFC power module; step 1) the condition that the tube driving signal of each sub-module of an upper bridge arm of a UPFC power module is high level needs to be met, the tube of the first sub-module is cut off at the next moment, and the cut-off induction voltage of the tube can be collected at the moment;
2) Calculating a turn-off induction voltage negative peak value corresponding to the upper tube according to the upper tube turn-off induction voltage collected in the step 1);
3) Repeating the step 1) and the step 2) for N periods to obtain the turn-off induction voltage negative peak value of the upper tube of each submodule of the upper bridge arm;
4) Obtaining the turn-off induction voltage negative peak value of the upper tube of each sub-module of the lower bridge arm of the UPFC power module in the same manner of the step 1), the step 2) and the step 3);
5) Sequencing all 2N turn-off induction voltage negative peak values from small to large, and calculating the average value of the first N turn-off induction voltage negative peak values;
6) Respectively calculating the mean square deviations of the N negative peak values of the turn-off induction voltage and the average value obtained in the step 5);
7) Comparing the maximum mean square error in the mean square errors with a set value, and if the maximum mean square error is larger than the set value, enabling the sub-module corresponding to the maximum mean square error to be in a sub-health state;
8) And according to the health state information of the sub-modules, completing the state evaluation of the UPFC power module.
2. The UPFC power module evaluation method based on off-state induced voltage negative peak values as claimed in claim 1, wherein: and 2) obtaining the negative peak value of the turn-off induction voltage by utilizing a differentiation or magnitude comparison mode.
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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 |
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