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Improved sliding-mode-PI control method of active-power-filter direct-current-side voltage

A power filter and DC side voltage technology, applied in active power filtering, AC network to reduce harmonics/ripples, etc., can solve the problem of chattering at the state point of the system without weakening, to reduce chattering, The effect of improving the response speed and steady-state accuracy and shortening the time

Inactive Publication Date: 2018-06-12
JIANGSU UNIV
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  • Abstract
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Problems solved by technology

In the literature (Li Lanfang, Xu Xiaogang, Wu Guobing. Research on the sliding mode PI control strategy of parallel APF DC side voltage [J]. Power System Protection and Control, 2017,45(5):32-36), the DC side capacitor is proposed Sliding mode PI control of the voltage, but does not weaken the chattering generated when the system state point crosses the sliding mode surface

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  • Improved sliding-mode-PI control method of active-power-filter direct-current-side voltage

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Embodiment Construction

[0043] The improved sliding mode PI control method of the DC side voltage of the active power filter proposed by the present invention includes as follows:

[0044] 1. Set the DC side capacitor voltage reference value u dc-ref * The actual value u of the capacitor voltage on the DC side detected by the voltage Hall sensor dc The difference between is defined as the state variable x 1 , the state variable x 1 The rate of change is defined as x 2 ,which is:

[0045]

[0046] 2. According to the system state equation Rewrite the sliding mode state equation and determine the sliding mode surface as a linear switching function, namely:

[0047]

[0048] Where c is a constant, the convergence speed of the sliding mode segment can be changed by changing the value of c; u is the control function; k is a constant and greater than zero. In the simulation system ε=0.3, k=0.1, c=0.0002.

[0049] 3. From the sliding surface s v The reaching law function obtained by the rate o...

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Abstract

The invention discloses an improved sliding-mode-PI control method of active-power-filter direct-current-side voltage, and belongs to the technical field of power. Direct-current-side capacitance voltage control is one of the key technology of APF compensation harmonic current. According to the improved sliding-mode-PI control method, traditional sliding-mode PI control serves as a basis, in the normal movement segment, the method adopts an improved reaching law function, a system state point reaches the condition that the speed of the sliding-mode surface is close to zero under the effect ofa control law u<1>(x), and therefore buffeting generated by inertia is reduced; in the sliding-mode movement segment, an improved reaching law function with a boundary layer is adopted, buffeting generated when the system-state point passes through the two sides of the sliding-mode surface is gradually reduced under the effect of a control law u<2>(x) in the process that the system-state point isasymptotically stabilized in an original point of the sliding-mode surface; when load sudden changes are carried out, the improved sliding-mode-PI control method has the advantages that the response speed is high, the steady-state accuracy is high, and the power grid current aberration rate after compensation is smaller.

Description

technical field [0001] The invention belongs to the technical field of active power filtering, and more specifically relates to an improved sliding mode PI control method for DC side capacitor voltage of a three-phase three-wire parallel active power filter. Background technique [0002] With the application of power electronic devices in the power grid, a large number of harmonics are generated in the power grid, resulting in pollution to the power grid. In recent years, since the performance of the active power filter (Active Power Filter, APF) in compensating harmonic current is obviously better than that of the passive power filter, it has been paid attention by scholars at home and abroad. Due to the power loss of the inverter power device in the active power filter, the active current exchange between the AC side of the APF and the grid, and the sudden load change will cause fluctuations in the capacitor voltage on the DC side. In order to ensure the compensation accu...

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Application Information

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IPC IPC(8): H02J3/01
CPCH02J3/01Y02E40/20
Inventor 李自成赵功建李国海许德志陈兆岭赵文祥朱孝勇吉敬华
Owner JIANGSU UNIV