摘要
该文提出一种基于灵敏度分析的直流受端系统紧急切负荷控制优化方法。首先,分析直流闭锁后受端系统的暂态稳定裕度以及切负荷量对暂态稳定裕度的灵敏度;接着,以紧急负荷控制的经济代价为目标,以最大摇摆角、最低频率、最低暂态电压稳定裕度及最大可控负荷等为约束条件,建立紧急切负荷控制优化问题的数学模型。为解决人工智能算法计算量大,难以实施的困难,应用灵敏度方法,将非线性动态优化问题近似为线性规划问题,迭代求解直至收敛到最优解。为克服可能收敛到局部最优解的不足,采用了多初值寻优的方法。最后,以河南省电力系统为例验证算法的有效性,结果表明算法可有效减小计算量,提高优化速度,在确保系统暂态稳定的前提下大大降低了控制代价。
A sensitivities analysis based emergency load shedding optimization method for the HVDC receiving end system was proposed in this paper.Firstly,the dynamic responses when HVDC lines were blocked were analyzed.The transient stability margins of rotor angle,frequency and voltages were defined quantitatively.The sensitivities between the amount of load shedding and transient stability margins were calculated.Then the emergency load shedding optimization problem was modeled taking the economic costs of load shedding as the objective function and the limits of transient stability margins and load shedding ratios as constraints.The artificial intelligence algorithms were hard to apply in practice due to heavy computation burdens.To solve this problem,the nonlinear dynamical optimization problem was approximated with a linear programming problem according to the sensitivities.It was solved iteratively until a convergence was reached.The multi-point start technology was used to avoid local optimization solutions.Finally,this algorithm was applied in Henan Province power grid to validate its effectiveness.The results show that it converges rapidly and can reduce economic cost of control efficiently while the transient stability of the receiving end system was guaranteed.
作者
孙大雁
周海强
熊浩清
杨阳
鞠平
赵娟
SUN Dayan;ZHOU Haiqiang;XIONG Haoqing;YANG Yang;JU Ping;ZHAO Juan(College of Energy and Electrical Engineering,Hohai University,Nanjing 211100,Jiangsu Province,China;Henan State Power Grid Company,Zhengzhou 450052,Henan Province,China)
出处
《中国电机工程学报》
EI
CSCD
北大核心
2018年第24期7267-7275,共9页
Proceedings of the CSEE
基金
高等学校学科创新引智计划(B14022)
江苏高校优势学科建设工程项目~~
关键词
直流受端系统
紧急控制
切负荷
暂态电压稳定裕度
灵敏度
线性规划
HVDC receiving end system
emergency control
load shedding
transient voltage stability margin
sensitivities
linear programming
作者简介
孙大雁(1970),男,博士研究生,主要研究方向为电力系统建模与控制,ddsdy@vip.sina.com;通信作者:周海强(1971),男,博士,教授,主要研究方向为电力系统稳定与控制,js.hq@163.com;熊浩清(1979),男,博士,教授级高级工程师,主要研究方向为电力系统运行分析与控制,xionghaoqing@ha.sgcc.com.cn;杨阳(1993),男,硕士研究生,主要研究方向为电力系统建模与控制,1193581344@qq.com;鞠平(1962),男,教授,主要研究方向为电力系统建模与控制,pju@hhu.edu.cn;赵娟(1976),女,高级工程师,主要研究方向为大电网安全稳控策略分析,zhaojuan3@ha.sgcc.com.cn。
