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Electricity network harmonic current signal tracking control method based on time delay compensation

A technology of harmonic current and control method, which is applied to electric controllers, controllers with specific characteristics, and AC networks to reduce harmonics/ripples, etc., and can solve problems that are difficult to implement and require high mathematical models

Inactive Publication Date: 2016-08-17
STATE GRID PUTIAN ELECTRIC POWER SUPPLY +1
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Problems solved by technology

However, the Smith estimator has high requirements on the mathematical model of the controlled object, which is difficult to achieve in engineering applications. In addition, the traditional Smith estimator is limited by parameters and cannot stabilize the system

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  • Electricity network harmonic current signal tracking control method based on time delay compensation
  • Electricity network harmonic current signal tracking control method based on time delay compensation
  • Electricity network harmonic current signal tracking control method based on time delay compensation

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Embodiment Construction

[0056] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0057] IHAPF structure such as figure 1 As shown, it is mainly composed of reactive power compensation capacitor, fundamental resonance branch, voltage inverter, uncontrollable rectification circuit and so on.

[0058] Such as figure 2 The harmonic single-phase equivalent circuit of IHAPF is shown, and the load is considered as a harmonic current source i h , u c i c are the output voltage and input current of the inverter respectively, i s is the harmonic current in the grid.

[0059] for the sake of figure 2 Filter out the harmonic current in the inverter, the output current i in the inverter can be c Control is:

[0060] i c =-i h (1)

[0061] then there is

[0062] i s =0 (2)

[0063] Traditional current control methods such as image 3 shown, where G 0 for i c with u c The transfer function between, the controller ado...

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Abstract

The invention provides an electricity network harmonic current signal tracking control method based on time delay compensation. The harmonic current signal tracking control method based on the time delay compensation is provided by aiming at the influence of the time delay control on a system and using an IHAPF (injection type hybrid active power filter) as a study object. According to the method, an improved smith predictor and a neural network PI controller are mainly used, wherein through the smith predictor, the system time delay process is converted from the inside of a control closed loop to the outside, so that the influence of the time delay control on the system is reduced; meanwhile, a PSO-BP algorithm is used for performing optimization processing on the PI controller parameters; a mathematical model between the smith predictor and the PI control parameter can be built according to an ITAE (integral time absolute error) criterion; finally, the mathematical model and the neural network are in optimized matching to obtain the optimum parameter of two controllers.

Description

technical field [0001] The invention relates to a grid harmonic current signal tracking control method based on delay compensation. Background technique [0002] With the widespread use of power electronic equipment in the distribution network, the problem of harmonic pollution in the distribution network of enterprises is becoming more and more serious, causing huge losses to the enterprise economy every year. The passive filter can only filter out the harmonics of each order, and it is easy to resonate with the power grid, which can no longer meet the requirements for harmonic suppression. The active filter is also an important means of suppressing harmonics. Its principle is to find the harmonic current from the target that needs to be compensated, and then the compensation device generates a compensation current that is equal to the harmonic and opposite in polarity. The harmonic currents cancel each other out. Active filters can dynamically compensate each harmonic an...

Claims

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Application Information

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IPC IPC(8): G05B13/02G05B13/04G05B11/42H02J3/01
CPCG05B11/42G05B13/027G05B13/042H02J3/01Y02E40/20
Inventor 庄建煌陈晶腾周静黄少敏王锐凤李萌锋陈永华王普专陈炳贵
Owner STATE GRID PUTIAN ELECTRIC POWER SUPPLY
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