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Method for tracking and controlling current of hybrid active filter

A source filter and current tracking technology, which is applied in the direction of electrical components, harmonic reduction devices, output power conversion devices, etc., can solve the problems of large current switch glitches and slow current response speeds, and achieve the goal of overcoming differential regulation and system Fast response and high precision effects

Inactive Publication Date: 2007-09-05
HUNAN UNIV
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Problems solved by technology

[0006] In order to solve the defects of slow current response speed of the linear current control method in the existing active filter and large current switch burrs in the hysteresis control method, the present invention provides a current tracking control method of a hybrid active filter

Method used

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  • Method for tracking and controlling current of hybrid active filter
  • Method for tracking and controlling current of hybrid active filter

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Embodiment Construction

[0027] Figure 4 is a structural diagram of an injection hybrid active filter. The new injection hybrid active filter in the figure is mainly composed of active filter, output filter, coupling transformer and passive filter. The active filter is a voltage-type inverter composed of intelligent power modules to solve the problem of harmonic dynamic compensation; a large capacitor C is connected to the DC terminal of the inverter, and an output filter L is connected to the AC terminal 0 、C 0 To filter the high-frequency burrs generated by switching devices on and off; the coupling transformer realizes the electrical isolation of the active filter and the passive filter, and selects the appropriate transformation ratio according to the voltage and current level of the two; it is connected in parallel to the power grid The passive filter consists of an injection branch and a 3rd and 5th order single-tuned filter bank, where the injection branch consists of a fundamental wave series...

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Abstract

The invention is concerned with current track control method of commixing active filter. Test and gather the compensation harmonic current outputted by inverter, count the difference between compensation harmonic current and the expectation compensation current of inverter, and compare the difference with given value of ring width. When the difference is bigger than the given value of ring width, the conventional hysteresis control take effect to confirm switch signal in the tape of instantaneous value compared manner. When the difference is smaller than or equal to the given value of ring width, it will control the filter according to the recursive integral PI control arithmetic. This method owns good dynamic capability and control precision, and the switch harmonic of inverter can be removed easily and there is not large switch harmonic enters into power supply.

Description

technical field [0001] The invention relates to a current tracking control method of a hybrid active filter. Background technique [0002] With the extensive application of power electronic equipment, the current waveform distortion caused by various nonlinear loads has caused pollution to the power grid. In order to solve the problem of harmonic pollution in power grids, active filters based on the principle of current harmonic extraction and injection have been widely used. [0003] Whether the active filter can achieve the expected harmonic suppression effect according to its working principle depends to a large extent on the advantages and disadvantages of the current tracking control method in addition to the reasonable design of the system circuit. The purpose of current tracking control is to ensure that the active filter can output the desired current. The standard for evaluating the quality of the current tracking control method depends on the real-time performance...

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Application Information

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IPC IPC(8): H02J3/01H02M1/12
CPCY02E40/40
Inventor 罗安汤赐赵伟帅智康唐杰范瑞祥周柯
Owner HUNAN UNIV
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