Comparative analysis method of reactive power compensation optimization schemes in regional power grid

Abstract

The invention discloses a regional power grid reactive power compensation optimization scheme comparison analysis method. The regional power grid reactive power compensation optimization scheme comparison analysis method includes the following steps of: configuration category index analysis: fuzzification processing is performed on the information of reactive power compensation equipment, and then weighting processing is performed on the information, and as a result, a configuration category index I1 can be obtained; configuration address selection index analysis: fuzzification processing is performed on address selection information, and then, weighting processing is performed on the address selection information, and as a result, a configuration address selection index I2 can be obtained; configuration capacity index analysis: fuzzification processing is performed the capacity information of the reactive power compensation equipment, and then, weighting processing is performed on the capacity information, and as a result, a configuration address selection index I3 can be obtained; and configuration comprehensive index analysis and conclusion drawing: weighting summation is performed on the above configuration category index I1, configuration address selection index I2 and configuration address selection index I3, and as a result, a configuration comprehensive index I can be obtained. With the regional power grid reactive power compensation optimization scheme comparison analysis method adopted, the capability of a power grid to receive and transmit new energy can be greatly enhanced with safe and economic operation of the power grid ensured, and wind curtailment can be decreased, and new energy-to-power grid electricity conversion efficiency can be improved.

Description

technical field [0001] The invention relates to the technical field of reactive power and voltage control in the process of large-scale new energy power generation, and specifically relates to a comparative analysis method for reactive power compensation optimization schemes of regional power grids. Background technique [0002] Most of the large-scale new energy bases generated after my country's wind power enters the stage of large-scale development are located in the "three north regions" (Northwest, Northeast, and North China). Large-scale new energy bases are generally far away from the load center, and their power needs to be transmitted to load center for consumption. Taking Gansu Power Grid as an example, as of April 2014, the installed capacity of grid-connected wind power in Gansu Power Grid has reached 7.07 million kilowatts, accounting for about 20.2% of the total installed capacity of Gansu Power Grid (35 million kilowatts), becoming the second largest after ther...

AI Technical Summary

Problems solved by technology

At present, the low-voltage tolerance of the wind turbine itself is very limited. At this time, the wind turbine often adopts the method of automatic cut-off for its own protection, which causes the active power imbalance of the system and affects the stability of the system; at the same time, the asynchronous generator does not have the ability to maintain and adjust The ability of the machine terminal voltage level, also absorbs reactive power from the system during operation, so the problem of voltage stability is more prominent

When the system voltage drops, if the grid cannot provide enough reactive power, the terminal voltage of the wind turbine based on the asynchronous generator cannot be rebuilt, resulting in the removal of the wind turbine by the overspeed protection or low voltage protection action of all the asynchronous wind turbines in the entire wind farm; if The protection cannot operate normally, because the terminal voltage of the wind turbine cannot be rebuilt, which will cause the transient voltage instability of the wind farm and even the regional power grid

Due to the mutual influence between the voltage and frequency of the entire power grid in the AC network system, the large changes in wind power output in Jiuquan area will inevitably cause voltage and frequency fluctuations in the entire system, resulting in further expansion of the accident

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