Novel power quality regulator on background of micro-grid

Abstract

The invention provides a novel power quality regulator on the background of a micro-grid aiming at a power quality management problem in the micro-grid. According to the novel power quality regulator on the background of the micro-grid, a distributed power source and energy storage elements are added on the basis of an original parallel connection mixed type active electricity filter, an improved type id-iq compound directive current detection and combining implement method are adopted, and demand that one machine is provided with a plurality of functions is met. According to the novel power quality regulator on the background of the micro-grid, harmonic wave and reactive current compensation of the micro-grid are effectively solved, at the same time, grid-connection generating functions of distributed power source are well achieved, and governance cost of the power quality of the micro-grid is saved to the greatest extent. Simulation and experiment operating data show that the design scheme is effective and reliable.

Description

technical field [0001] The invention relates to the field of micro-grid power quality regulation and management, in particular to a novel power quality regulator under the background of micro-grid. Background technique [0002] As the penetration rate of microgrid in the power grid system continues to increase, the power grid will face power quality problems caused by microgrid distributed power sources and nonlinear loads. In engineering applications to improve power quality, a parallel hybrid active power filter (HAPF) composed of a passive filter bank and an active filter in parallel is widely used. However, due to the time-varying characteristics of nonlinear loads, HAPF is often in a low-power operating state, and the efficiency has not been fully utilized. In addition, the distributed power in the microgrid is extremely intermittent and random, and the distributed power grid-connected inverter cannot always maintain the rated output condition, and the capacity factor ...

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Problems solved by technology

The article "Options for Control of Reactive Power by Distributed Photovoltaic Generator" in the 6th issue of "Proceedings of the IEEE" in 2011 pointed out that photovoltaic grid-connected inverters can transmit reactive power and maintain voltage stability at the public connection with the large power grid , but there is the disadvantage that the inverter output reactive power is not controlled; the article "Enhanced Power Quality Control Strategy for Single-Phase Inverters in Distributed Generation System" in the 3rd issue of "IEEE Transactions on Power Electronics" in 2011 studied the distribution The problems related to the harmonics and reactive power compensation function of the inverter in the type power generation system have achieved certain results. The disadvantage is that the inverter needs to be equipped with an output current limiting device, otherwise there is a risk of stopping work

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