无开关灭磁实用技术

发电机在正常和事故停机时,一般利用灭磁开关来消耗转子中剩余的能量。但这种传统的灭磁方式不仅使励磁系统的结构过于复杂,也增加了系统设备的运行维护成本。无开关灭磁技术根据发电机组不同运行工况下可能产生的转子过电压情况,结合逆变灭磁,并利用跨接器可快速开断的优点,合理设计控制策略,满足发电机安全、可靠的灭磁要求。

Application of de-excitation technology without switches

The de-excitation switches are usually applied to dissipate the residual energy stored in the rotor when generators trip off in the normal condition or in contingency. However, this method not only complicates the configuration of excitation systems, but also increases the maintenance cost of the equipment. The application of de-excitation method without switches was proposed countering the over-voltage caused in the rotor windings in different generator operating modes. Associated with the de-excitation by inverters, the technology takes the advantage of fast switching of crowbars, properly devises the control strategy and is able to meet the criteria of security and reliability.