有功调频—无功调压的间接电流型并网逆变器控制方案
An Indirect Current Control Scheme for Grid-connected Inverter with Regulation of Active Power to Phase and Reactive Power to Voltage Amplitude
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摘要: 分析了并网逆变器的数学模型,得出逆变器输出电压的频率和幅值与电网吸收的有功和无功的关系,并基于此关系,提出了一种间接电流控制型并网逆变器控制方案,即在锁相环完成锁相的基础上,通过有功功率闭环调节逆变器输出电压的频率,通过无功功率闭环调节逆变器输出电压的幅值。为保证逆变器相位调节的精度,提出了一种逆变器频率调节算法。仿真和实验验证了所提出控制方案的有效性。Abstract: Through analyzing the mathematical model of a grid-connected inverter,such conclusions can be drawn that the phase and amplitude of inverter output voltage can regulate active power and reactive power respectively.Accordingly,a novel grid-connected inverter control scheme based on indirect current control mode is proposed.In the scheme,active power loop and reactive power loop respectively regulate the frequency and amplitude of inverter output voltage with a phase-locked loop（PLL） locking the phase.In order to improve the phase regulating accuracy,a new frequency regulating algorithm is proposed.The validity of the scheme proposed is verified by simulation and experimental results.
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