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A Method for Estimating the Installed Capacity of Parallel APF Based on Harmonic Source Injection

A technology of installed capacity and harmonic source, which is applied in special data processing applications, instruments, electrical digital data processing, etc., can solve the problem that harmonic compensation cannot achieve the expected effect, and achieve low cost, strong field practicability, small error effect

Active Publication Date: 2017-12-08
WUHAN KELIYUAN ELECTRIC CO LTD
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Problems solved by technology

In fact, the system impedance of the power grid has an impact on the selection of APF capacity. Directly using the load harmonic current as the APF capacity will often make the APF capacity selection too small, so that the harmonic compensation cannot achieve the expected effect.

Method used

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  • A Method for Estimating the Installed Capacity of Parallel APF Based on Harmonic Source Injection
  • A Method for Estimating the Installed Capacity of Parallel APF Based on Harmonic Source Injection
  • A Method for Estimating the Installed Capacity of Parallel APF Based on Harmonic Source Injection

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Embodiment

[0022] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0023] like figure 1 As shown, the method for estimating the installed capacity of parallel APF based on harmonic source injection is: to establish the Thevenin equivalent model on the system side and the load side; use the harmonic source injection method to solve the Thevenin equivalent parameters on the system side and the load side; use Thevenin equivalent model and parameters to calculate the installed capacity of parallel APF.

[0024] like figure 2 As shown, it is the Thevenin equivalent model diagram of the system side and the load side. Since each harmonic is assumed to be independent of each other, the Thevenin equivalent model of the nth harmonic is shown in the figure. The PCC is the access point of the APF, and the Thevenin equivalent model on the system side is: the equivalent potential on the system side System side equival...

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Abstract

The invention relates to a harmonic source injection based method of estimating installed capacity of a parallel APF (active power filter). The method is provided by considering a load harmonic difference before and after compensation caused by system impedance. The method includes: establishing system side and load side Thevenin equivalent models from a point to be accessed, of the APF; solving system side and load side Thevenin equivalent parameters by means of a harmonic source injection method; calculating the capacity of the parallel APF through the models and the parameters. The method is low in implementing cost, has low error and has great field applicability.

Description

technical field [0001] The invention relates to a method for estimating the installed capacity of a parallel APF, in particular to a method for estimating the installed capacity of a parallel APF based on harmonic source injection. Background technique [0002] With the increasing number of power electronic devices and nonlinear loads in the power grid, the harmonic pollution of the power system is becoming more and more serious. Harmonics not only affect the normal operation of electrical equipment, but also bring hidden dangers to the safe and economical operation of the power grid. Active power filter (APF) is an effective means to solve the harmonic pollution of power system, and it is more and more widely used in power system. [0003] In the actual field, the determination of APF capacity is very important. The existing parallel APF capacity selection usually regards the power grid as an infinite power source, load harmonics as a constant harmonic current source, and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F19/00
Inventor 李尚盛吴楠宫金武瞿李锋杨泽洲孙建军查晓明
Owner WUHAN KELIYUAN ELECTRIC CO LTD
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