Reactive power compensation method and system for micro power grid

Abstract

The invention relates to a reactive power compensation method and a reactive power compensation system for a micro power grid. The system comprises a distributed measuring unit, a reactive power compensation control unit, a reactive power compensation unit and a communication unit. The micro power grid comprises a distributed power supply with reactive regulation output. For the micro power grid operated in an isolated network mode, the overall reactive power balance condition of the micro power grid is obtained by measuring the active and reactive power distribution conditions of each branchcircuit of the micro power grid, and a reactive power compensation device or the reactive power compensation device and the distributed power supply are subjected to reactive regulation in the micro power grid according to a specific isolated network reactive control strategy to realize the reactive power compensation of the micro power grid. The power factor of the micro power grid can be measured and corresponding reactive power compensation is performed according to the power factor when the micro power grid is operated in a grid-connected mode and in the isolated network mode.

Description

technical field [0001] The invention relates to a method and system for reactive power compensation of a power system, in particular to a method and system for reactive power compensation of a microgrid. Background technique [0002] Reactive power compensation technology plays an extremely important role in reducing energy loss in the existing power system, but the application of existing reactive power compensation technology is usually limited to conventional power systems. , distribution, and phase-separated systems, so there is a clear node that can be used to measure the power factor of the entire conventional power system. Usually, the corresponding power factor is calculated by measuring the current and voltage data at the node, and can be further Determine the corresponding reactive power compensation strategy. For example, the voltage and current measured on the incoming line switch of the user substation can reflect the actual demand for reactive power compensati...

AI Technical Summary

Problems solved by technology

When the microgrid operates in grid-connected mode, it can usually be determined by measuring the current and voltage at the PCC switch (that is, at the common connection point where the microgrid is connected to the external large grid) according to the existing reactive power compensation technology Reactive power compensation requirements of the entire microgrid. However, when the microgrid operates in the isolated grid mode, since its power supply and load are mixed together, no power condition of any node can reflect the reactive power of the entire microgrid. In terms of balance, it is impossible to measure the reactive power distribution of the microgrid with the existing reactive power compensation technology, so the adjustment of the reactive power of the microgrid cannot use the existing methods and equipment, and there is no relevant technical solution that can be applied to the microgrid Reactive Power Compensation

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