Impedance ratio stability judgment method suitable for distributed energy storage system

A distributed energy storage and impedance ratio technology, which is applied in special data processing applications, instruments, electrical digital data processing, etc., can solve problems such as difficult application of distributed energy storage systems, and achieve a wide range of applications

Active Publication Date: 2020-09-11
STATE GRID JIANGXI ELECTRIC POWER CO LTD RES INST +2
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  • Application Information

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Problems solved by technology

When the energy storage unit works in the discharge mode, it is essentially a power converter, so the system has the characteristi

Method used

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  • Impedance ratio stability judgment method suitable for distributed energy storage system
  • Impedance ratio stability judgment method suitable for distributed energy storage system
  • Impedance ratio stability judgment method suitable for distributed energy storage system

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Embodiment Construction

[0037] The technical solution in the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them.

[0038] In the description of the present invention, it should be noted that unless otherwise specified and limited, the terms "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral Ground connection; it can be mechanical connection or electrical connection; it can be direct connection or indirect connection through an intermediary. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention in specific situations.

[0039] refer to Figure 1-12 As shown, a preferred embodiment of the present invention, a method for judging impedance ratio s...

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Abstract

The invention discloses an impedance ratio stability judgment method suitable for a distributed energy storage system. The method comprises the following steps: measuring the parallel impedance Zbus of all converters of the distributed energy storage system; calculating a novel impedance ratio Zc/Znc according to the Zbus and the bus capacitor C; wherein the denominator is parallel impedance Znc of all converters after bus capacitance is removed, the molecule is capacitance impedance Zc, an impedance ratio Zc/Znc is used as an equivalent open-loop transfer function to draw a Nessler diagram, the system stability is judged according to the Nessler diagram, if an amplitude-phase curve does not surround (-1, 0j) points, the system is stable, and otherwise, the system is unstable. The stability of the system is judged by means of impedance, the limitation that a traditional impedance ratio criterion can only judge the stability of a single-source system is overcome, the power flow direction of a converter does not need to be distinguished, and the application range is wider compared with the traditional impedance ratio criterion.

Description

technical field [0001] The invention relates to the technical field of distributed power supply, in particular to a method for judging impedance ratio stability applicable to distributed energy storage systems. Background technique [0002] The distributed energy storage system consists of multiple energy storage units, which can be connected to wind, light and other renewable energy sources and various types of DC power loads. It has the advantages of good reliability, flexible interface and high power density, and has been widely used in new energy field. The distributed energy storage system is composed of multiple converters. Although each converter is stable when working alone, the combination of converters will change the total impedance of the system, affect the dynamic performance of the system, and even cause system instability and damage to power devices. Stability is a key issue in distributed energy storage systems. [0003] The traditional method of analyzin...

Claims

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Application Information

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IPC IPC(8): G06F30/33H02J3/00G06F7/535G06F119/02
CPCG06F7/535G06F30/33G06F2119/02H02J3/00H02J2203/20
Inventor 潘本仁胡斯登朱正斌张妍谢国强桂小智
Owner STATE GRID JIANGXI ELECTRIC POWER CO LTD RES INST
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