特高压同步电网安全性论证

Security Evaluation for UHV Synchronized Power Grid

根据《电力系统安全稳定导则》,从短路电流、静态安全性、暂态稳定性、动态稳定性等方面,校核了特高压同步电网方案的安全稳定性;根据《电力安全事故应急处置和调查处理条例》要求,校核了可能发生的自然灾害导致的电网严重故障下,特高压同步电网的承受能力及可采取的措施;根据第3道防线的设置原则和要求,分析了由低频减载、低压减载和解列控制构成的第3道防线在特高压同步电网的适应性。结果表明,特高压同步电网安全性满足《电力系统安全稳定导则》的要求,承受严重故障能力强,第3道防线可有效控制事故范围,避免出现大停电;采用基于广域同步量测信息的自适应解列、交直流协调控制等技术可以进一步提高系统的安全性。

According to ‘Guide on Security and Stability for Power System’, security and stability of UHV synchronized power grids were evaluated in following aspects： short-circuit current, static security, transient and dynamic stabilities. Based on requirements of ‘Emergency disposal, investigation and settlement regulations of electrical safety incidents’, fault tolerance ability of UHV power grids and available measures were verified under serious failure conditions, probably caused by natural disasters. According to setting principles and requirements, adaptability of the third defense line was analyzed including under-frequency load shedding, under-voltage load shedding and splitting. Results indicated that security performance of UHV synchronized power grids can meet demands of ‘Guide on Security and Stability for Power System’ and has strong capability of withstanding serious failure. The third defense line can effectively control failure scope and avoid blackouts. Self-adaptive splitting technique based on wide area synchronous measurement information, together with AC-DC coordinated control technique, can further improve power grid security performance.