Intelligent reactive power compensation control system for distributed power grid-connected power generation

Abstract

The invention discloses an intelligent reactive power compensation control system for distributed power grid-connected power generation. The system comprises a sampling unit, a four-quadrant electrical data processor, a central processing unit (CPU) and a control signal output drive unit, wherein the sampling unit is used for sampling three-phase current and the three-phase voltage of the low voltage 0.4 kV side of the original distribution transformer; the four-quadrant electrical data processor is used for receiving the quadrants of the sampled three-phase current and three-phase voltage forjudging, and the electrical parameters including active power, reactive power, power factor and the like are calculated in the different quadrants; the CPU is used for exchanging and integrating theparameter data of all the quadrants into a single command and sending out control signals; the control signal output drive unit is used for receiving the control signals and driving an external capacitor bank for switching. The system provided by the invention is characterized in that the system can determine the different quadrants of the sampled current and voltage, thereby correspondingly calculating the different quadrants of the reactive power and the power factor. The two parameters, i.e., the reactive power in the different quadrants and the power factor in the different quadrants are taken as a control basis for capacitor switching, so that the reactive power compensation operation requirements of distributed power grid-connected access can be met.

Description

technical field [0001] The invention relates to an intelligent reactive power compensation control system for distributed power grid-connected power generation. By using the sampling current and voltage to calculate through four quadrants, comprehensively considering the situation of reactive power and power factor appearing in the four quadrants, finally Control capacitor switching, so as to meet the safe operation requirements of distributed power grid connection. Background technique [0002] In recent years, due to the influence of the national subsidy policy, more and more domestic distributed power supply projects have been constructed, and the installed capacity has become larger and larger. In the distributed power grid-connected project, in order to reduce costs, many distributed power sources choose the nearest 0.4 kV low-voltage grid-connected mode, and directly connect the power supply to the nearby 0.4 kV low-voltage side of the distribution transformer for oper...

AI Technical Summary

Problems solved by technology

At present, almost all of the distributed power generation is pure active power, and its power factor is close to 1. With the access of the distributed power source, the original power load will give priority to the active power provided by the distributed power source, and at this time the power load The required reactive power can only be absorbed from the grid side, which leads to different quadrants of voltage and current, so that reactive power also has different quadrants

At this time, if the parameter calculation is only performed in a single quadrant as the control basis, it will inevitably cause the controller to fail to judge normally, and it will not work normally.

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