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One-cycle vector control-based SAPF control method and system

A technology of vector control and control method, applied to AC network circuits, electrical components, and AC networks to reduce harmonics/ripples, etc., can solve problems such as complex structures and high costs, and achieve simplified circuit structures, reduced losses, and overcome control Parameter tuning depends on the effect of experience

Inactive Publication Date: 2017-03-15
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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Problems solved by technology

[0004] At present, SAPF control mainly adopts methods such as hysteresis control, triangular wave control, and deadbeat control. These methods include harmonic and reactive power detection links, and at the same time, complex command calculations are required to obtain the reference value of compensation current, so the structure is complex and the cost is low. high

Method used

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Embodiment

[0040] On the basis of analyzing the structure and working principle of SAPF, the present invention introduces the one-cycle control into the control of SAPF, and introduces the concept of "zero-sum component", vector operation and particle swarm optimization algorithm according to the defects of traditional one-cycle control (Particle Swarm Optimization, PSO), to achieve the purpose of filtering out the harmonic current of the power grid.

[0041] (1) The introduction of "zero-sum components"

[0042] figure 1 It is a traditional three-phase SAPF single-cycle control block diagram. Assuming that the three-leg voltage converter always works in a continuous current state, the switching frequency is much higher than the power frequency (50Hz), and the switches on each bridge arm work in a complementary state. Set the switches S of the upper and lower bridge arms jP , S jN (where j=a,b,c) have a duty cycle of 1-d respectively jN and d jN , then the voltages of nodes a, b, ...

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Abstract

The invention relates to a one-cycle vector control-based SAPF control method and system. The method comprises the following steps of 1) obtaining three phases of voltage zero-sum components of a power supply separately, wherein each zero-sum component is a synthetic component of a positive sequence component and a negative sequence component; 2) performing regional division on a voltage cycle according to zero crossing points of the three phases of voltage zero-sum components into six regions in total; 3) obtaining a control equation based on the one-cycle vector control on each region according to a regional division result; 4) obtaining the working state of each phase of bridge arm switch on an SAPF inverter on each region according to the regional division result and the corresponding control equation based on the one-cycle vector control, and generating a corresponding switch driving signal according to the working state; and 5) ensuring the direct current side voltage stability of the SAPF inverter by adopting PSO-optimized PI control. Compared with the prior art, the control method and system have the advantages of circuit simplification, wide applicable range, loss reduction, optimization control and the like.

Description

technical field [0001] The invention relates to the field of power quality control of a grid, in particular to a SAPF control method and system based on single-cycle vector control. Background technique [0002] In recent years, with the development of power electronics technology, semiconductor nonlinear loads are increasing in the power system. The introduction of these loads will generate a large number of harmonics and reactive power, which poses a threat to the power quality of the grid. At present, the problem of harmonic pollution is mainly solved from two aspects: one is to transform the power electronic device itself and develop a new type of converter. The second is to install various types of harmonic suppression and reactive power compensation devices outside the grid. The former is only applicable to the case where the main harmonic source is power electronic equipment, while the latter is applicable to all harmonic sources, so it has a broader application pros...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/01H02J3/18
CPCH02J3/01H02J3/1842Y02E40/30Y02E40/40
Inventor 程启明
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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