|
| 摘要: |
| 为消除高压直流电网运行中出现的零电流瞬态时直流电压过电压等异常状态,提出依据被控环境在高压直流电网整流端的每个桥中选取合适的晶闸管旁路对来旁路直流侧的方法。针对整流端被控变量多、变量间关系耦合强和时间约束条件苛刻等特点,采用Petri网系统,描述了依据产生异常状态的原因和整流端的运行状态选取晶闸管旁路对的方法及其控制策略,并给出了控制策略流程图。详述了单整流桥和双整流桥的触发脉冲的算法。在高压电网上的模拟实验获得成功。 |
| 关键词: 旁路控制,旁路对选择,高压直流,数字控制 |
| DOI： |
| 分类号:TM721.2 |
| 基金项目: |
|
| Shunt circuit control strategy for HVDC rectifier terminal |
|
WANG Pei-chang ZHANG Jun-xing
|
| Abstract: |
| In order to eliminate some abnormal phenomena such as over DC voltage at zero-current transient of an HVDC system,a method to shunt the direct current loop of HVDC system with shunting pairs of thyristors,which are selected for every bridge of the rectifier terminal according to control environment,is presented.Because the quantity of variable to be controlled is big,the coupling between variables is strong and requirements for real time performance is severe,Petri nets are used to describe the way to select shunting pairs of thyristors and the shunting control strategy according to the cause of abnormal phenomena and the operating conditions of rectifier terminal.The flowchart of control strategy is given in detail.The algorithm of firing impulses for single and double rectifier bridge is discussed.Tests on an HVDC system show the effectiveness. |
| Key words: shunt circuit control,shunting pair selection,HVDC,digital control |
