智能变电站二次系统集成优化设计

Optimal Integration Design of the Smart Substation Secondary System

针对集中式保护存在单一装置故障影响范围大、未能充分利用全站信息优化保护性能等问题,本文分析了智能变电站纵向集成和横向集成的技术特点,提出了实现集成保护所需的硬件与软件实现方案。以典型220k V变电站为例,基于纵向集成提升实时性和横向集成提升信息共享的原则,提出了两种集成模式结合的方案,解决单一装置故障影响范围大的问题。提出了站域差动后备保护,优化了全站保护的性能两种方案。针对集中式保护的检修难题提出了单网双套方案,解决了集中式保护检修时影响范围较大、停电时间延长的问题。工程方案分析表明,本文提出的集成方案能提升继电保护的选择性、灵敏性、快速性和可靠性,并降低变电站建设成本。

Nowadays smart substations are confronted with problems such as the large number of devices, large number of stages of data transmission, operation and maintenance. Then the implementation scheme of the solution is presented. The smart substation integration is divided into vertical integration and horizontal integration. Solution is proposed for the key hardware and software technology used to achieve integrated protection. Taking the 220kV substation as an example, the engineering implementation scheme is analyzed. Besides, the scheme of a single grid with two integrated protection devices is proposed, which can solve the maintenance problem of centralized protection, the wide-ranging effect and the long power outage time during the period of the centralized protection fault or maintenance. Engineering practice results demonstrate that these integration methods can enhance the selectivity, sensitivity, rapidity and reliability of relay protection; can also realize the intelligentization of onsite primary equipment and reduce the construction cost of substations.