Novel power quality regulator on background of micro-grid

A technology of power quality and micro-grid, which is applied in the energy industry, single-network parallel feeding arrangement, AC network to reduce harmonics/ripples, etc., and can solve the problem of uncontrolled output reactive power of inverters, stop working, etc. problems, achieve the effect of realizing grid-connected power generation, saving input costs, realizing harmonic control and reactive power compensation

Inactive Publication Date: 2013-05-22
HUNAN UNIV OF TECH
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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 fo

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  • Novel power quality regulator on background of micro-grid
  • Novel power quality regulator on background of micro-grid
  • Novel power quality regulator on background of micro-grid

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Embodiment Construction

[0017] Microgrid novel power quality conditioner topology:

[0018] The topology of the new power quality conditioner for microgrid is as follows: figure 1 shown. It consists of a grid-connected inverter and its control unit, a passive filter bank, a microgrid distributed power supply and an energy storage unit. The DC side of the grid-connected inverter is connected to the energy storage unit and the distributed power supply, and the AC side is connected to the grid through a reactance and a power capacitor. The reactance and the power capacitor will be tuned to a fixed subharmonic to form a single-tuned passive L-C filter. Among them, the original APF inverter AC side output filter inductor is included in the single-tuned passive L-C filter inductor. Compared with the conventional parallel APF, it can be seen that only one tuning capacitor is added, which not only maintains the simplest structure, It also has many advantages of the hybrid compensation device. Moreover, wh...

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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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Application Information

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IPC IPC(8): H02J3/38H02J3/01H02J3/18
CPCY02E40/30Y02E40/40Y02P80/14
Inventor 李圣清李永安曾黎琳何政平
Owner HUNAN UNIV OF TECH
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