Active power filter based on inverter side current feedback and current control method of active power filter

A power filter, inverter technology, applied in active power filtering, AC network to reduce harmonics/ripple, AC power input conversion to DC power output, etc., can solve the problem of reducing stability and control accuracy, increasing Damping loss, multiple sensors, etc., to achieve the effect of large stability margin and damping effect, good resonance suppression ability, and improved control accuracy
CN104600705AInactive Publication Date: 2015-05-06STATE GRID CORP OF CHINA +3
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Patent Information

Authority / Receiving Office
CN ยท China
Current Assignee / Owner
STATE GRID CORP OF CHINA
Publication Date
2015-05-06
Estimated Expiration
Not applicable ยท inactive patent

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Abstract

The invention discloses an active power filter based on inverter side current feedback and a current control method of the active power filter. The active power filter comprises an APF (active power filter) system and an LCL filter, and the APF system is in a three-phase bridge type parallel structure. The current control method includes that feedback current of a current closed-loop control system takes inverter side current i1, a master controller GA (s) adopts PI control, and capacitance current feedback control is adopted. By means of feedback adjustment of LCL filter capacitance current on the basis of traditional feedback control of single inverter side current, control precision of the system is improved while resonance of the LCL filter and power grid parameters can be restrained.
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Description

technical field

[0001] The invention relates to an active power filter based on inverter side current feedback and a current control method thereof, belonging to the field of active power filter control. Background technique

[0002] High-frequency switching harmonics are an inevitable product of PWM rectifiers. For Active Power Filters (APF) that compensate for grid harmonics, it should be avoided that their high-frequency harmonics flow into the grid and cause secondary pollution to the grid. For this reason, people usually install an output filter on the grid-connected side of the device. Compared with other filters such as the L single-inductor type, the LCL type filter has a better filtering effect and requires a smaller filter inductance, but the LCL filter is prone to resonance, which affects the stability of the system.

[0003] The current closed-loop control feedback current of the LCL type APF can select the inverter side current and the grid side current. The c...

Claims

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