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Method for controlling microgrid inverter to improve voltage quality of microgrid bus

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

Active Publication Date: 2017-05-31
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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  • Method for controlling microgrid inverter to improve voltage quality of microgrid bus
  • Method for controlling microgrid inverter to improve voltage quality of microgrid bus
  • Method for controlling microgrid inverter to improve voltage quality of microgrid bus

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Embodiment Construction

[0040] See figure 1 In this embodiment, the microgrid system includes several distributed power generation units, linear and non-linear loads, drive circuits, sampling and conditioning circuits, and protection circuits, which are connected in parallel between several distributed power generation units, including main circuits and local control The main circuit includes a micro-source, a three-phase full-bridge inverter, a filter inductor L, a filter capacitor C, and a feeder connected in sequence. The three-phase full-bridge inverter circuit includes six power switches. The common bus bar also connects linear and non-linear loads; several distributed power generation units, linear and non-linear loads form an independent micro-grid, and the system also includes a communication system connecting the local controller and the micro-grid central controller.

[0041] The control method of the microgrid inverter for improving the voltage quality of the microgrid busbar in this embodime...

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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 its load form. 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. The harmonic current caused by the nonlinear load produces a harmonic voltage drop on the line impedance and inverter output impedance, which will cause the distortion of the bus voltage, affect the power supply quality of the bus load, and even cause system instability in severe cases. In order to improve the quality of microgrid power supply, a common method is to install power quality improvement devices, such as active filters. However, the type ...

Claims

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Application Information

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Patent Type & Authority Applications(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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