摘要
量测不确定性使传统方法的估计精度难以满足调度的要求。利用区间分析法来描述量测不确定性问题,建立主动配电网状态变量的动态区间优化模型,并运用线性规划的方法求解,得到状态变量的动态可行域。基于量测不确定性理论,以测点正确率最高为目标函数建立抗差状态估计模型,利用内点法求解出状态估计值。以状态变量动态可行域作为约束,区间中值作为初值,相对于以实际物理约束和历史数据最值为约束,减少了状态变量求解的范围,降低了计算量。通过IEEE 30、IEEE 118和实际配电网系统来验证该方法的可行性和有效性。在抗差性测试中,结合评价函数提出新的评价指标,分别在3种不同的约束下对比了状态估计结果,验证了所提方法的精确性和抗差性。同时能够对分布式电源接入节点的电压进行有效的跟踪和估计。
The uncertainty of measurement makes the estimation accuracy of traditional methods difficult to meet the requirements of scheduling.The interval analysis is used to describe the measurement uncertainty.The dynamic interval optimization model of state variables of active distribution network is established,and the dynamic feasible region of state variables is obtained by using linear programming method.Based on the uncertainty of measurement and taking the highest accuracy of measurement point as the objective function,the robust state estimation model is established and the state estimation value is solved by modern interior point method.Taking the dynamic feasible region of the state variable as the constraint and the median value of the interval as the initial value,compared with the actual physical constraint and the maximum value of the historical data as the constraint,the range of solving the state variable is reduced and the amount of calculation is reduced.The feasibility and effectiveness of this method are verified by IEEE 30,IEEE 118 and actual distribution network systems.Combined with the evaluation function,a new evaluation index is proposed in the test of tolerance.Under three different constraints,the results of state estimation are compared,and the feasibility and accuracy of the proposed method are proved.At the same time,it can effectively track and estimate the voltage of the distributed generation access node.
作者
曾顺奇
吴杰康
李欣
蔡锦健
ZENG Shunqi;WU Jiekang;LI Xin;CAI Jinjian(Guangzhou Power Supply Bureau of Guangdong Power Grid Corporation,Guangzhou 510620,China;School of Automation,Guangdong University of Technology,Guangzhou 510006,China)
出处
《南方电网技术》
CSCD
北大核心
2021年第9期24-34,共11页
Southern Power System Technology
基金
广东省基础与应用基础研究基金区域联合基金项目——粤港澳研究团队项目(20201910260000002)
广东省科技计划项目(2020A050515003)
广东电网有限责任公司广州供电局科技计划项目(GZHKJXM20190062)。
关键词
主动配电网
抗差状态估计
动态区间优化
线性规划
内点法
active distribution network
robust state estimation
dynamic interval optimization
linear programming
interior point method
