弱受端小电网频率紧急控制措施配合研究.pdfVIP

弱受端小电网频率紧急控制措施的配合研究 1 2 1 2 2 贾萌萌 , 丁剑 ， 张建成 ，宋云亭 ，周俊 (1.华北电力大学, 河北省保定市 071003 ；2. 中国电力科学研究院，北京市 海淀区 100085) 摘要：基于电网低频紧急状态下系统频率变化特性的一般规律，详细分析了功率缺额扰动下的弱 受端小电网暂态频率变化特点及其影响因素，如功率缺额、网内开机台数、负荷类型、故障地点 及类型、切荷率、切负荷时间、电容器投切情况等等，并给出了定性的理论公式推导。基于上述 小孤网频率变化特性的影响因素分析，针对小电网功率缺额扰动后存在的频率首摆下潜深度过大、 持续时间较长的特点，提出了弱受端小电网安控切负荷措施与低频减载措施的配合原则和具体配 合方案：切负荷时间和切荷率的配合、装置动作出口配合；并以西北某实际弱受端小电网为例， 进行了仿真分析。仿真结果验证了所提配合原则的合理性和具体两种配合方案的可行性。 关键词：弱受端小电网 脱网运行 暂态频率偏差 切负荷 低频减载 配合方案 Study on the coordination of Emergency Frequency Control Measures in Small Weak Receiving Power System 1 2 1 Jia Meng-meng , Ding Jian , Zhang Jian-cheng (1. North China Electric Power University, Baoding 071003, China 2. China Electric Power Research Institute, Beijing 100085, China) Abstract: Based on the general rules of system frequency variation characteristics in low-frequency emergency state, this paper detailedly analyzes the frequency influencing factors in small weak receiving power grid during the disturbance of power shortage, such as the quantity of power shortage, number of operating hydroturbines, type of load, fault locations and types, load shedding time, load shedding ratio, whether to switch capacitor or not etc, and then it presents the theoretical derivation qualitatively. On the foundation of the influencing factors in small isolated power grid above, in the light of the characteristics of the large dive depth and long duration of the frequency first swing, this paper proposes two coordination schemes of load shedding and under-frequency load shedding: load shedding time and load shedding ratio coordi