Island micro-grid system and interactive oscillation suppression method and system thereof

A micro-grid and island technology, applied in the direction of reducing/preventing power oscillation, electrical components, circuit devices, etc., can solve problems such as research on uninhibited methods, and achieve the effects of avoiding network attacks, maintaining dynamic performance, and omitting secondary communication

Pending Publication Date: 2022-02-08
GUANGDONG ZHICHENG CHAMPION GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since the impedance of LVSM is different from that of VSR, the prior art has not studied the method of suppressing the mutual oscillation of VSG and LVSM

Method used

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  • Island micro-grid system and interactive oscillation suppression method and system thereof
  • Island micro-grid system and interactive oscillation suppression method and system thereof
  • Island micro-grid system and interactive oscillation suppression method and system thereof

Examples

Experimental program
Comparison scheme
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Embodiment Construction

[0036] Embodiment 1 of the present invention provides an island microgrid system including a source-load virtual synchronous machine, such asfigure 1 As shown, the island microgrid system of Embodiment 1 uses VSG and LVSM in combination. The island microgrid system includes multiple power supply units, each power supply unit includes a VSG and an LVSM, and the LVSM is connected to a load. The connection point between the VSG and the LVSM is called a common coupling point.

[0037] In Embodiment 1 of the present invention, there are n power supply units, so there are n VSGs (VSG1, VSG2, ..., VSGn) and n LVSMs (LVSM1, LVSM2, ..., LVSMn).

[0038] Embodiment 2 of the present invention provides an interactive oscillation suppression method for the isolated island microgrid system in Embodiment 1, such as figure 2 As shown, the interactive oscillation suppression method of the present invention is controlled from the source side virtual synchronous generator. The virtual synchron...

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Abstract

The invention discloses an island micro-grid system and an interactive oscillation suppression method and system thereof. A source side virtual synchronous machine and a load side virtual synchronous machine are combined to provide virtual inertia and damping. The invention provides a d-axis inductive current feedforward control and d-axis voltage feedback control method to remodel the impedance of the VSG so as to reduce the impedance amplitude of the VSG. Therefore, the low-frequency interaction between the VSG and the LVSM can be suppressed. The method can be used for solving the problem of interactive oscillation of the alternating current island micro-grid composed of the multi-source-load virtual synchronous machine.

Description

technical field [0001] The invention relates to a low-frequency oscillation suppression technology of a power grid, in particular to an isolated island micro-grid system and a method and system for suppressing interactive oscillations thereof. Background technique [0002] In recent years, with the increasingly prominent problems of energy shortage and environmental pollution, distributed microgrids composed of photovoltaic systems, wind power generation, energy storage, and voltage source converters (VSCs) have been widely used. However, with the gradual increase in the penetration rate of power electronic converters, the low inertia of the system and the random generation of renewable energy threaten the stability of the island microgrid. [0003] In order to solve this problem, a virtual synchronous machine (VSM) came into being, which simulates the dynamic characteristics of a synchronous motor and provides virtual inertia and damping for the power system. Virtual synch...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/00H02J3/24H02J3/38H02J3/46
CPCH02J3/388H02J3/46H02J3/466H02J3/002H02J3/24H02J3/241H02J2203/10
Inventor 陈燕东郭健伍文华谢志为周乐明周小平徐千鸣何志兴
Owner GUANGDONG ZHICHENG CHAMPION GROUP
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