Impedance detection method for diesel generator system performing parallel current sharing with energy storage converter

A technology for energy storage converters and diesel generators, which is used in the measurement of resistance/reactance/impedance, AC network load balancing, instruments, etc. It can solve problems such as damage to diesel generators, difficulty in parallel control, etc. Effects of Parallel Operation Characteristics

Active Publication Date: 2019-03-19
四川科陆新能电气有限公司
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  • Abstract
  • Description
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Problems solved by technology

However, there is a large difference in the impedance characteristics of the output port between the diesel generator and the energy storage converter, which makes it difficult to control the parallel connection of the energy storage converter and the generator in the form of a voltage source, and current circulation may occur after parallel connection , if the circulating current flows to the generator, the generator absorbs power and may damage the diesel generator

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0021] A method for detecting the impedance of a diesel generator system connected in parallel with an energy storage converter for current sharing, comprising the following steps:

[0022] S1: Establish an independent detection rotating coordinate system;

[0023] S2: Record the voltage amplitude Ugm when the energy storage converter is not running and Ugd0, Ugq0 calculated according to the detection rotating coordinate system;

[0024] S3: Start the energy storage converter in the detection system impedance mode, and the energy storage converter outputs the negative maximum reactive power. After the output power is stable, calculate the current Rgi and Xgi, i=1, Rgi and Xgi are the i-th The resistance and reactance of the diesel generator system calculated during the first test;

[0025] S4: Gradually increase the reactive power output with a certain step size until reaching the positive maximum reactive power of the energy storage converter, and calculate Rgi and Xgi at ea...

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Abstract

The invention discloses an impedance detection method for a diesel generator system performing parallel current sharing with an energy storage converter. The method comprises the steps: building a detection rotating coordinate system, and detecting and calculating a no-load voltage of a diesel generator and system impedances in different load levels; calculating the system mean impedance through astatistical method; finally setting the output impedance of the energy storage converter according to the capacity ration of the diesel generator and the energy storage converter. According to the invention, the detected impedance of the diesel generator system is set in the energy storage converter according to the capacity ratio, thereby enabling the energy storage converter to have the same output characteristics as the diesel generator, enabling the output power to be distributed according to the capacity ratio when the energy storage converter and the diesel generator perform the parallel load operation, guaranteeing that there is no parallel loop current between the energy storage converter and the diesel generator and enabling the energy storage converter and the diesel generator to have the good parallel operation characteristics.

Description

technical field [0001] The invention relates to power electronics technology, in particular to an impedance detection method of a diesel generator system connected in parallel with an energy storage converter for current sharing. Background technique [0002] An independent power generation system in which diesel generators and energy storage converters operate in parallel is a power system that operates independently in areas isolated from large power grids, and is often used in remote mountainous areas, isolated islands and other areas. The two are connected in parallel to supply power to the load to improve the economy of power generation, reduce environmental pollution, and enhance the self-sufficiency of power supply in remote areas. However, there is a large difference in the impedance characteristics of the output port between the diesel generator and the energy storage converter, which makes it difficult to control the parallel connection of the energy storage conver...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38H02J3/28G01R27/02
CPCH02J3/28H02J3/38G01R27/02
Inventor 谢茂军
Owner 四川科陆新能电气有限公司
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