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A three-phase four-wire parallel apf double closed-loop nonlinear composite control method

A three-phase four-wire system, compound control technology, applied in AC network to reduce harmonic/ripple, AC network circuit, electrical components, etc. Difficulties in filter design and other issues

Active Publication Date: 2019-05-14
CHONGQING CHUANYI AUTOMATION
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Problems solved by technology

The traditional PI control algorithm can achieve good tracking control when the reference signal is DC, but it cannot achieve static error-free tracking for the harmonic command signal that changes from time to time
Hysteresis control is a transient feedback control system. Although it has the advantages of high precision and fast response, it can obtain better tracking performance, but its switching frequency fluctuates greatly, and the output filter design is difficult.

Method used

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  • A three-phase four-wire parallel apf double closed-loop nonlinear composite control method
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  • A three-phase four-wire parallel apf double closed-loop nonlinear composite control method

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Embodiment Construction

[0086] The present invention will be described in further detail below in conjunction with the embodiments and accompanying drawings, but the embodiments of the present invention are not limited thereto.

[0087] figure 1 Flowchart of the new double-closed-loop nonlinear compound control method for three-phase four-wire parallel APF.

[0088] A three-phase four-wire parallel APF double-closed-loop nonlinear composite control method, the specific steps are:

[0089] Step (1): Detect the power supply voltage U s(abc) , power side current I s(abc) , load side current I L(abc) , APF compensation current I f(abc) and DC side upper and lower capacitor voltage U dc1 , U dc2 .

[0090] Step (2): The sum of the voltages of the upper and lower capacitors on the DC side U dc (Udc =U dc1 +U dc2 ) and DC side reference voltage value U dc_ref For comparison, the error signal is obtained, and the error signal is passed through the sliding mode PI controller to obtain the current i...

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Abstract

A three-phase four-wire parallel APF double closed-loop nonlinear composite control method. The voltage outer loop adopts a sliding mode PI composite nonlinear control algorithm, and the current inner loop adopts a repetitive PI nonlinear control algorithm. This method first uses synchronous rotation coordinate transformation to establish a low-order system model of the dq coordinate system, designs a PI feedforward decoupling controller based on the dq DC model, designs a PI repetitive controller based on internal model control, and establishes a current inner loop PI repetitive controller. The control output function of Control function of sliding mode PI controller. The outer loop sliding mode PI composite control algorithm of the present invention can improve the steady-state performance and response speed of the DC side voltage, and effectively reduce voltage fluctuations; the repeated PI nonlinear control algorithm can realize static error-free tracking of the current signal and improve the harmonic compensation current. Instruction tracking control accuracy.

Description

technical field [0001] The invention belongs to the field of active filter control, in particular to a three-phase four-wire parallel APF double-closed-loop nonlinear composite control method. Background technique [0002] Parallel active power filter (Active Power Filter, APF) is an effective means to solve the harmonic pollution of the power grid. It can realize accurate, real-time and effective compensation for the harmonics, negative sequence current and reactive power existing in the power grid system. The output compensation characteristics of the active filter mainly depend on the control method of the current and voltage, and the main circuit topology of the converter device used. The earliest control strategy applied to the active power filter is that the current loop adopts single PI control, and the DC side voltage is added with an independent power supply device. At present, the research on the topology of active filters is relatively mature, and now basically n...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/18H02J3/01
CPCH02J3/01H02J3/1842Y02E40/20
Inventor 马辉官轲吉培荣危伟鄢圣阳
Owner CHONGQING CHUANYI AUTOMATION
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