Active damper which can improve the stability of grid-connected inverter system and regulate the power
A technology of system stability and power regulation, applied in single-network parallel feeding arrangements, harmonic reduction devices, wind power generation, etc., can solve problems such as weak suppression of high-frequency resonance and increased complexity of inverter control algorithms, etc. Achieve the effects of improving stability, increasing computing burden, and good compatibility
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[0085] Example
[0086] An application example of the present invention is given below.
[0087] Such as Figure 7 As shown, the PCC of the inverter 17 and the active damper are incorporated into the weak grid 18 to form a grid-connected system, and their parameters are shown in Table 1 and Table 2, respectively. Grid line impedance Z g It is pure inductive, and the inductive value is 1000μH.
[0088] The waveform diagram of this specific embodiment is as Figure 8 As shown, from top to bottom are three-phase PCC voltage waveform, inverter three-phase grid-connected current waveform, active damper grid-connected current waveform, and active damping adaptive impedance admittance waveform.
[0089] When the active damper works alone, the grid-connected system is stable. The active damper does not need virtual impedance to stabilize the system, and only needs to feed energy to the grid according to the demand of active power and reactive power. However, when the inverter cuts in, the sy...
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