Active damping method of LCL grid-connected inverter system and circuit for realizing active damping method
An inverter and damping technology, which is applied to electrical components, output power conversion devices, and AC networks to reduce harmonics/ripples, etc. It can solve the influence of grid voltage harmonics and distortion interference, and the quality of grid current waveforms. The improvement effect is limited, etc., to achieve the effect of suppressing the impact
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[0016] The invention will be described in detail below in conjunction with the accompanying drawings and embodiments.
[0017] Explanation of the symbols and labels of the accompanying drawings: U PV ——Inverter input voltage; S 1 ~S 4 ——power switch tube; u g — grid voltage; L 1 , L 2 ——Inductance of network filter; i 1 , I 1 , u 1 , U 1 、r 1 ——Filter inductance L 1 current, voltage and internal resistance; i 2 , I 2 , u 2 , U 2 、r 2 ——Filter inductance L 2 current, voltage and internal resistance; C 1 ——filter capacitor; i C , I C , u C u C , - filter capacitor C 1 current and voltage; u inv ——the output voltage between the bridge arms of the inverter; I 2ref ——Incoming grid current reference; K——Inverter equivalent proportional link; G 2 (s)——incoming grid current controller; k 1 - Differential feedback coefficient.
[0018] The present invention introduces the grid-side inductance L 2 Voltage u 2 The feedback achieves resonance damping of the LC...
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