谐波畸变下电网的无功优化  

Reactive power optimization for system network accompanied with harmonic distortion

作　　者：贺春[1] 赵书强[1] 魏晓光[1] 夏尚学[1] 

机构地区：[1]华北电力大学电力系,河北保定071003

出　　处：《电力自动化设备》2003年第1期14-17,共4页Electric Power Automation Equipment

摘　　要：系统中装设了大量的电容器进行无功优化以降低网损,但在谐波频率下,容易产生系统与电容器之间的谐波谐振或谐波放大,从而使系统的谐波畸变率变大,破坏了系统的安全运行。针对这一问题,提出了谐波畸变情况下对电网进行无功优化的模型。给出了用遗传算法进行求解的具体步骤:染色体编码;适应值函数的选取;遗传操作;进行系统优化。并通过灵敏度方法对遗传算法进行了改进。用VB编制了仿真程序,对Ward-Hale六节点系统进行了仿真计算。结果表明,在满足电网电压和谐波标准约束的情况下,模型能达到系统网损和谐波畸变最小。且改进的方法大大加快了遗传过程的进化速度,说明了改进方法的有效性。In the power system,many capacitor banks are applied to decrease the loss of the net-work.The harmonic resonance may occur between the network and the capacitor banks in the har-monic frequency,thus the system security may be destroyed because of the high level harmonic distortion.Mathematical model of network optimal operation is set up to handle this problem.A specific method named genetic algorithm,whic h was refined by the sensitivity method,is applied in the model.The process is as following:the coding of chromosomes;the option of the fitness function;operation of the genetic algorithm;system optimization.VB was used in the test based on Ward-Hale6-bus system.The system power loss and harmonic distortion are minimized,while th e voltage amplitude constraints and harmonic constraints are satisfied.The speed of Genetic Algorithm is increased greatly,which shows the effectiveness of the refined method.

关 键 词：谐波畸变 电网 无功优化 遗传算法 灵敏度 电力系统 无功补偿 

分 类 号：TM714.3[电气工程—电力系统及自动化] TM76