Adaptive virtual impedance based equipartition control method island of AC micro-grid power

A virtual impedance, microgrid technology, applied in the direction of reducing/preventing power oscillation, single-grid parallel feeding arrangement, etc., can solve the complex selection of inverse sigmoid function, the modeling of consistency algorithm is complex, and it is difficult to find the best function term and other problems to achieve the effect of reducing dependence and improving reliability

Inactive Publication Date: 2019-05-07
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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  • Abstract
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Problems solved by technology

However, the selection of the inverse S-type function is more complicated and needs to be verified one by one, and it is difficult to find the best function item
"Distributed Adaptive Virtual ImpedanceControl for Accurate Reactive Power Sharing Based on Consensus Control in Microgrids[J].IEEE Transactions on Smart Grid, 2017, 8(4)" uses a consensus algorithm to find reactive power mismatch values ​​and feed the mismatch values ​​to Integral controller to generate virtual impedance correction, the control strategy does not need to know the physical parameters, and realizes voltage recovery based on dynamic consistency control, but the consistency algorithm modeling is more complicated

Method used

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  • Adaptive virtual impedance based equipartition control method island of AC micro-grid power
  • Adaptive virtual impedance based equipartition control method island of AC micro-grid power
  • Adaptive virtual impedance based equipartition control method island of AC micro-grid power

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Embodiment

[0039] The following describes the power sharing control method for islanded AC microgrids based on adaptive virtual impedance from the aspects of traditional droop control principle, improved power control strategy, parameter optimization selection, and example verification.

[0040] (1) Traditional droop control principle

[0041]Considering the line parameters, in order to obtain a good filtering effect, an LC filter is used to reduce harmonic injection into the grid. Usually, the inductance value of the LC filter is relatively large, and the connection impedance between the inverter output terminal and the load is mainly inductive . Therefore, the present invention ignores the resistive component of the line, and the output power of the inverter can be simplified as:

[0042]

[0043]

[0044] It can be seen that the active power has a linear relationship with the phase angle, and the reactive power has a linear relationship with the voltage. The traditional droop c...

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Abstract

The invention relates to an adaptive virtual impedance based power equipartition control method of the island AC micro-grid. The island AC micro-grid comprises public bus DGs connected in parallel toan inverter. According to the method, sagging control is used to realize power distribution, and the method is characterized in that adaptive virtual impedance is introduced, reactive distribution ofa system is adjusted adaptively, and reactive circulating current is reduced. Compared with the prior art, the improved sagging control strategy is used on the basis of the adaptive virtual impedance,the system power is decoupled completely, impedance difference among lines is eliminated, reactive power is equipartitioned, and the reactive circulating current is inhibited. Frequency recovery andvoltage compensation links are added, so that the system frequency and voltage are stabled around rated values respectively, and indifference adjustment is realized.

Description

technical field [0001] The invention relates to a method for controlling power equalization of an island AC microgrid, in particular to a method for controlling power equalization of an island AC microgrid based on an adaptive virtual impedance. Background technique [0002] In recent years, the development of microgrid has attracted extensive attention from domestic and foreign scholars. A microgrid is a small power generation and distribution system that organically integrates distributed power sources, loads, energy storage devices, converters, and monitoring and protection devices. The external grid can be connected to the grid or run in isolation. [0003] Composing Distributed Generation (DG) into a microgrid has many advantages. In island operation mode, DGs running in parallel usually adopt droop control to achieve reasonable power distribution. Traditional droop control does not rely on the communication technology of the central controller to realize parallel DG...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38H02J3/46H02J3/50H02J3/24
Inventor 米阳颜丽韩云昊宋根新蔡杭谊苏向敬时帅喻思
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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