The controlling loop includes start-up circuit, frequency tracking circuit, driving signal circuit, and water lack protecting circuit.

控制回路由启动、频率跟踪、驱动信号、缺水保护电路组成。

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Three soft start-up technique for voltage loop are compared with each other, which are the reference of DC bus voltage gradually increasing, constant charging current and different PI modulation.

电流环软启动通过输出电流指令递增实现，电压环软启动则比较了直流侧电压指令逐步升高法、恒定电流充电法、变PI参数调节法三种策略。

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