轻型高压直流输电中的光纤驱动及检测策略

Study on Optical Fiber Drive and Detection Strategy in HVDC Light

非并网风电最主要的应用前景为具有直流负载特性的高耗能产业,非常适合于轻型高压直流输电(HVDC Light)。HVDC Light中,增加传输信号的抗电磁干扰能力,提高信号的速度和精度是当前研究的热点。为了将变换器的功率电路地与控制电路地进行电气隔离,使电源安全稳定地工作,设计了基于高压环境的光纤隔离驱动策略和光纤隔离检测策略。为了满足高压信号实时检测的需要,采用"V/F转换-光纤传输-F/V转换"方式进行转换、传输和检测;为了满足高压驱动的需要,采用M57962AL结合光纤来实现。实验验证了该方案的可行性,它具有隔离电压等级高、传输精度高、速度快等优点。

The non-grid-connection wind power is mainly used in high energy consumption industries with DC load, especially in the High Voltage Direct Current Light （HVDC Light）, where advancing the transmission capabiliW of anti-electromagnetic and improving the speed and accuracy are one of the hot spots of current researches. The fiber-optical isolation drive and fiber-optical detection strategy in high voltage environment are put forward, which are proposed through making electrical isolation between power supply from the ground of converter circuit and control circuit to finally ensure the stable and safe work of power supply. On the one hand, the method of ＂the V/F transform-fiber optical transmission-F/V transform＂ to convert, transmit and detect signals is used to realize any specific detection of the high voltage signal. On the other hand, the method using fiber optic combined with M57962AL is used to achieve the high voltage drive. The achieved results of experiment demonstrate the feasibility of the proposal, which is quite suitable for HVDC Light and could be widely applied due to the flowing characteristics： the high voltage of isolation, high precision and fast speed of transmission, etc.