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首页> 外文期刊>Electric power systems research >A PWM controlled variable damping resistor for protecting the power capacitor/passive power filter
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A PWM controlled variable damping resistor for protecting the power capacitor/passive power filter

机译：PWM控制的可变阻尼电阻器，用于保护功率电容器/无源功率滤波器

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摘要

A protection device for the power capacitor/passive power filter has been proposed. This device includes a control circuit, a conventional switch, a PWM switch and a resistor. The PWM switch is connected in parallel with a resistor to form a variable damper, serially connected to the power capacitor/passive power filter, in order to avoid the resonant amplification phenomenon. A conventional switch is used to switch on/off the power capacitor/passive power filter to the power distribution system. The control circuit calculates the voltage and the current of the power capacitor/passive power filter and compared to their upper tolerance values. The compared results are adapted to determine the duty ratio of PWM switch and the operation of conventional switch in order to protect the power capacitor/passive power filter circuit from the damage of over-voltage/over-current. Besides, this protection device can also improve the inrush current problem of the power capacitor/passive power filter at the instant of turning on. The performance of the proposed protection device has been verified by computer simulation. The simulation results show that the proposed PWM controlled variable damping resistor has the expected performance.
机译：已经提出了用于功率电容器/无源功率滤波器的保护装置。该设备包括控制电路，常规开关，PWM开关和电阻器。 PWM开关与电阻并联连接以形成可变阻尼器，该可变阻尼器串联至功率电容器/无源功率滤波器，以避免谐振放大现象。使用常规开关来接通/断开功率电容器/无源功率滤波器到配电系统。控制电路计算功率电容器/无源功率滤波器的电压和电流，并与它们的上限容差值进行比较。比较结果适于确定PWM开关的占空比和常规开关的操作，以保护功率电容器/无源功率滤波电路免受过电压/过电流的损害。此外，该保护装置还可以改善在接通瞬间功率电容器/无源功率滤波器的浪涌电流问题。所提出的保护装置的性能已经通过计算机仿真得到了验证。仿真结果表明，所提出的PWM控制可变阻尼电阻具有预期的性能。

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