CAJ | 학술논문

特高压交直流混合电网的电压运行特性对AVC系统的建设提出了新的需求。首先分析了AVC系统需应对的当交直流系统分别发生不同时间常数扰动后的四种工况，提出了增加直流换流站母线协调电压约束、自适应地调整AVC系统中母线电压限值、调节优化计算的时刻以及控制目标等手段的协调控制策略。基于AVC仿真平台和IEEE39节点标准算例系统的连续仿真，通过比较当交流和直流系统分别发生方式变更时，采用协调策略前后的系统响应，验证了协调策略可以减少无功补偿设备不合理的投切。提出的协调策略将在四川电网得以实际应用。
특고압교직류혼합전망적전압운행특성대AVC계통적건설제출료신적수구。수선분석료AVC계통수응대적당교직류계통분별발생불동시간상수우동후적사충공황，제출료증가직류환류참모선협조전압약속、자괄응지조정AVC계통중모선전압한치、조절우화계산적시각이급공제목표등수단적협조공제책략。기우AVC방진평태화IEEE39절점표준산례계통적련속방진，통과비교당교류화직류계통분별발생방식변경시，채용협조책략전후적계통향응，험증료협조책략가이감소무공보상설비불합리적투절。제출적협조책략장재사천전망득이실제응용。
The characteristics of the UHVDC/AC hybrid grid have put forward new demands on the construction of AVC system. This paper firstly analyzes four operating modes which AVC system needs to cope with when the disturbances occur in the AC gird and the UHVDC grid respectively with different time constants. According to that, the coordinated control strategy including adding the coordinated bus voltage constraints of the converter station, adaptively refreshing the voltage constraints in the AVC system, adjusting the optimal control calculation time as well as control objectives is given. On basis of the continuous AVC simulations on standard IEEE 39 example system and by comparing the system response before and after the coordinated strategy is adopted when the AC and UHVDC grids’ operation modes have changed, the coordinated control strategy will reduce the unreasonable switching times of var compensation equipment is verified. The proposed coordinated control strategy will be applied in Sichuan grid.