淮沪特高压工程自动电压控制系统(AVC)无功电压控制策略研究

Reactive Voltage Control Strategy for AVC System in Huaihu UHV Project

淮沪特高压工程投运对华东电网无功电压控制提出了更高的要求。淮沪特高压工程自动电压控制系统(AVC)旨在满足限制工频过电压要求的基础上,综合考虑特高压变电站低容低抗动作次数最少、特高压变电站与500 kV电网穿越无功最小、系统有功网损最小等多项优化目标。以"保持低容/低抗基础投切模式为主,自动电压校正控制为辅"的淮沪特高压AVC控制策略能有效地实现上述优化目标,该控制策略的关键组成部分是合理的特高压变电站低容/低抗基础投切模式。通过计算淮沪特高压工程各种不同运行方式下的低容/低抗最优投切策略,得出了一组可有效适用于淮沪特高压工程投产初期电网运行方式的特高压变电站低容/低抗基础投切模式。

The operation of Huaihu UHV project has set higher requirements for the reactive voltage control in East China Power Grid. The project automatic voltage control （AVC） system is designed to comprehensively consider vari- ous optimization goals while meeting the requirements of power frequency overvohage limit, such as minimizing the low-capacity and low-resistance actions, minimizing cross reactive power between UHV substation and 500 kV power grid, and minimizing system active power loss. The above optimization objectives may be effectively achieved by Hua- ihu UHV AVC control strategy, which is characteristic of ＂Keeping a basic low-capacity and low-resistance switching model as priority, while taking automatic voltage corrective control as complementary＂ . The key component of the control strategy is the reasonable low-capacity and low-resistance switching model of UHV substation. A set of effec- tive switch modes applied to initial operation of UHV project have been obtained through calculating optimal switching strategies under various operation modes of UHV project.