高压直流输电线路单极闭锁入地电流协调控制策略

Coordination Control Strategy for the Grounding Current of HVDC Transmission Line with Monopole Blocked

随着我国西电东送工程和高压直流输电技术的快速发展,高压直流输电线路在运行中对油气管道产生的影响日渐显著。研究表明,高压直流输电线路产生的接地极入地电流会在管道上产生干扰电位,对管道运行产生风险。为保证油气管道的安全运行,开展了高压直流线路单极闭锁后入地电流的多对象协调控制相关研究,以全网发电机组出力变化最小为优化目标,加入快速降低入地极电流为约束条件,将高压直流单极闭锁入地电流协调控制建模为非线性规划模型,采用不可行内点法对模型进行求解。并通过南方电网高压直流线路进行在线开环算例验证,通过算例验证了该方法的正确性和有效性。

With the rapid development of West-to-East power transmission and high voltage direct current(HVDC)technique,the impact of HVDC transmission line on oil-gas pipeline becomes increasingly severe.Researches have shown that the grounding current at DC grounding electrode of HVDC transmission line will generate interference potential on pipelines which leads to operational risks.To guarantee safe operation of oil-gas pipeline,this paper proposes a novel coordination control strategy of HVDC monopole block with grounding current constraint.Aiming at minimizing the change of overall generation output and adding fast-decreasing grounding current as constraint,the HVDC monopole block situation is modelled as non-linear programming and solved by infeasible interior point algorithm.The proposed method is verified on HVDC models of China Southern Power Grid in online open-loop circumstances and effectiveness of the algorithm is demonstrated.