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APF current prediction control algorithm with self-adaptive adjustment of DC side voltage

A DC side voltage, self-adaptive adjustment technology, applied in AC network voltage adjustment, AC network to reduce harmonics/ripples, active power filtering, etc., can solve the problem of unable to dynamically adjust DC side voltage, APF compensation performance degradation question

Inactive Publication Date: 2015-08-19
CHINA UNIV OF MINING & TECH
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Problems solved by technology

[0004] The purpose of the present invention is to provide an APF current predictive control algorithm for self-adaptive adjustment of the DC side voltage to solve the problem that the traditional APF control method cannot dynamically adjust the DC side voltage, which leads to the decline of APF compensation performance when the power system working condition changes

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  • APF current prediction control algorithm with self-adaptive adjustment of DC side voltage
  • APF current prediction control algorithm with self-adaptive adjustment of DC side voltage
  • APF current prediction control algorithm with self-adaptive adjustment of DC side voltage

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Embodiment 1

[0050] Embodiment 1: this control algorithm comprises the steps:

[0051] Step 1. Set the switch state functions of the three-phase bridge arms of the APF as S a , S b , S c, the switching device of the upper bridge arm of the three-phase bridge arm is represented by 1, and the switching device of the lower bridge arm is represented by 0. The two-level APF can generate 8 switching states in total, and the αβ transformation of the switching state is expressed as the vector form S n (n=0~7), 8 voltage vectors v that APF can output are obtained from 8 switch states n (n=0~7);

[0052] Step 2: From the three-phase to-be-compensated current i ha i hb i hc to be compensated current vector i h , by the three-phase grid voltage e a 、e b 、e c Get the grid voltage vector e, the three-phase compensation current i output by the APF ca i cb i cc Get the compensation current vector i c ;

[0053] Step 3. According to the grid voltage vector e and the current vector i to be co...

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Abstract

The invention discloses an APF current prediction control algorithm with self-adaptive adjustment of DC side voltage, and belongs to an APF current prediction control algorithm. The control algorithm comprises the following steps: 1, obtaining eight voltage vectors from eight switch states of an APF; 2, according to sampling signals, calculating a compensation current vector ih, a power network voltage vector e and a compensation current vector ic; 3, according to a system condition, calculating a DC side voltage reference value V<dc><*>and a compensation current reference value i<*> which are needed by the APF, and adaptively controlling the DC side voltage; 4, predicting compensation current which can be output by the APF under the respective effects of the eight switch states Sn; and 5, according to a difference between each compensation current predication value i<n> and the reference value i<*>, performing selection on the switch states for applying to each switch device. The APF current prediction control algorithm has the following advantages: the algorithm is simple in structure, can adjust the DC side voltage in real time according to change of the system condition, maintains quite small current ripples and power loss while guaranteeing the output performance of the APF, and improves the compensation performance of the APF.

Description

technical field [0001] The invention relates to an APF current predictive control algorithm, in particular to an APF current predictive control algorithm for self-adaptive adjustment of DC side voltage. Background technique [0002] Harmonic or reactive currents generated by nonlinear loads will degrade the power quality of the power grid, affect social production and life, and cause economic losses. In the case of complex and time-varying harmonic or reactive current components, the traditional LC passive filter is increasingly unable to meet the power quality requirements of the power system. Active Power Filter (APF) effectively overcomes the shortcomings of traditional methods and has become an important way to compensate harmonic or reactive current. Only the fundamental current or fundamental active current is output to achieve the purpose of dynamic compensation. It can compensate the current to be compensated with changes in frequency and amplitude, and the compensa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/12H02J3/01
CPCY02E40/20
Inventor 周娟陈映董浩刘刚唐慧英朱玉振毛海港甄远伟宋振浩王福均郑婉玉段崇嵩杨宇
Owner CHINA UNIV OF MINING & TECH
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