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A method for detecting impedance of a diesel power generation system connected in parallel with an energy storage converter for current sharing

An energy storage converter and impedance detection technology, which is applied in the direction of measuring resistance/reactance/impedance, AC network load balancing, instruments, etc., can solve problems such as damage to diesel generators, and difficulty in parallel control, so as to reduce circulating current and achieve good parallel connection Effects of operating characteristics

Active Publication Date: 2022-03-18
四川科陆新能电气有限公司
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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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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 a method for detecting the impedance of a diesel generator system connected in parallel with an energy storage converter for current sharing. The method detects and calculates the no-load voltage of the diesel generator and the system under different load levels by establishing a detection rotating coordinate system. Impedance, using statistical methods to calculate the average impedance of the system, and finally set the output impedance of the energy storage converter according to the capacity ratio of the diesel generator and the energy storage converter. In the present invention, the detected impedance of the diesel generator system is set in the energy storage converter according to the capacity ratio, so that the energy storage converter has the same output characteristics as the diesel generator, so that the output when the two are connected in parallel with load The power is distributed according to the capacity ratio to ensure that there is no parallel circulation between the two, and has 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 Patents(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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