A Control Method of Microgrid Inverter for Improving Microgrid Bus Voltage Quality

A bus voltage and control method technology, applied in the direction of single-network parallel feeding arrangement, etc., can solve the problems of inverter voltage controller complexity and difficulty in participating in voltage quality control, and achieve flexible bus voltage quality control and voltage control algorithm Conciseness, the effect of reducing investment

Active Publication Date: 2019-05-28
HEFEI UNIV OF TECH
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Problems solved by technology

However, not all inverters in the microgrid are suitable to participate in voltage quality regulation, and it is difficult to participate in voltage quality control when the grid-connected inverter itself outputs full capacity
In addition, every time a harmonic voltage control is added, a resonant controller needs to be added, and the inverter voltage controller is complex

Method used

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  • A Control Method of Microgrid Inverter for Improving Microgrid Bus Voltage Quality
  • A Control Method of Microgrid Inverter for Improving Microgrid Bus Voltage Quality
  • A Control Method of Microgrid Inverter for Improving Microgrid Bus Voltage Quality

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Embodiment Construction

[0040] see figure 1 , the microgrid system in this embodiment includes several distributed power generation units, linear and nonlinear loads, drive circuits, sampling conditioning circuits, and protection circuits, which are connected in parallel among several distributed power generation units, including main circuits, local control connected to the common bus through a feeder; the main circuit includes sequentially connected micro-sources, a three-phase full-bridge inverter, a filter inductor L, a filter capacitor C, and a feeder, and the three-phase full-bridge inverter circuit includes six power switches The common bus is also connected to linear and nonlinear loads; several distributed power generation units, linear and nonlinear loads form an independent microgrid, and the system also includes a communication system connecting the local controller and the central controller of the microgrid.

[0041] In this embodiment, the control method of the microgrid inverter to im...

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Abstract

The invention discloses a method for controlling a microgrid inverter to improve voltage quality of a microgrid bus. The method is characterized in that the microgrid inverter works independently under own control to improve the voltage quality of the microgrid bus and distributes powder between units; the microgrid inverter can accept scheduling of a top central management system and adjust output voltage of the microgrid inverter according to a scheduling instruction of the top management system to realize voltage control and voltage quality improvement of the bus. The microgrid inverter is used to participate in voltage quality improvement of the microgrid bus, by controlling inverter output impedance to absorb load-caused harmonic current, input of special electrical and electronic devices for improving electric energy quality in a microgrid can be reduced, and control is more flexible because of the dispersity of mounting of the microgrid inverter.

Description

technical field [0001] The invention relates to a control method of a microgrid inverter for improving the voltage quality of a microgrid bus. Background technique [0002] As a small power generation system that can be connected to the grid or run independently off the grid, the microgrid has great randomness and diversity in the form of load in the grid. However, a large number of civil and industrial equipment in the network are equipped with power electronic device interfaces, making the load mainly characterized by nonlinear characteristics. Harmonic currents caused by nonlinear loads will generate harmonic voltage drops on line impedance and inverter output impedance, which will cause bus voltage distortion, affect the quality of bus load power supply, and even cause system instability in severe cases. In order to improve the power supply quality of the microgrid, a common method is to install power quality improvement devices, such as active filters. However, the ty...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/46
CPCH02J3/46
Inventor 赖纪东闵小宇苏建徽杜燕汪海宁施永杨向真
Owner HEFEI UNIV OF TECH
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