与电压源型逆变器相比,电流源型逆变器能升压,无需加入死区,且交流侧无需额外增加无源滤波器。但其直流母线电流并非恒流源,而是由电压源与直流母线电感产生,需要在控制系统中加入直流母线电流的调节。因此,以带直流斩波器的单相五开关电流源型并网逆变器为研究对象,首先针对直流母线电流的给定与控制方法展开研究,然后针对电流源型逆变器开关信号不能通过传统调制方式直接产生的问题,推导出开关信号的逻辑表达式;接下来针对网侧LC滤波器存在的尖峰谐振问题,引入电容电压有源阻尼环节,在考虑数字延时的情况下,建立网侧部分的数学模型,结合幅频特性曲线研究电容电压反馈系数与网侧电流比例-谐振控制器参数优化设计方法;最后构建仿真模型与实验平台,进行仿真与实验验证。结果表明,逆变器能输出高品质电能,同时具有良好的动态性能,证明该文的理论分析与所提方法是正确可行的。
Abstract
Compare to voltage source inverter, without adding dead time, current source inverter has the ability to boost the voltage, and no additional passive filter is required at the AC-side. However, the DC-link current is not a constant current source, and is generated by the voltage source and the DC-link inductor, so it is necessary to consider the DC-link current regulation in the control system. Therefore, in this paper, single-phase five-switch current source grid-connected inverter with DC-chopper is studied. Firstly, the reference calculation and the control method of the DC-link current is presented. Then, aiming at the problem that the switching signal of the current source inverter cannot be directly generated by the traditional modulation, the logic expression of the switching signal is deduced. Next, aiming at the peak resonance problem of the LC filter on the grid side, the active damping based on capacitor voltage is introduced, under the consideration of the digital delay, the mathematical model of the grid side structure is established and the optimization design method of proportional-resonance controller parameters is studied by combining the amplitude-frequency characteristic curve. Finally, the simulation model and experimental platform are constructed to carry out simulation and experimental verification. The results show that high-quality power with a good dynamic performance can be provided by the inverter, which proves that the theoretical analysis and the proposed method are correct and feasible.
关键词
光伏发电 /
脉冲调制 /
谐振 /
电流源型逆变器 /
直流母线电流 /
有源阻尼
Key words
photovoltaic power generation /
pulse modulation /
resonance /
current source inverter /
DC-link current /
active damping
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基金
国防科技工业核动力技术创新中心（HDLCXZX-2021-ZH-016）; 重庆市自然科学基金（CSTB2022NSCQ-MSX0430）
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