摘要
在交直流混联电力系统中,交流侧系统发生故障将会引起互联系统区域间的频率振荡,从而导致常规机组的调频压力增大,机组阀门动作频繁。在不增加交流系统中常规机组调频压力的前提下,如何利用直流系统传输功率可进行快速调节和具有短时过载能力的特点进行直流输送功率的有效控制具有重要的意义。本文首先对直流输电系统的附加频率控制器进行建模,在此基础上对引入附加直流频率限制器后的两区域交直流电力系统进行仿真,重点分析交流系统发生故障时,附加直流频率控制器对系统频率稳定性的影响以及附加直流频率限制器控制参数对系统频率稳定性的影响。仿真结果表明,附加频率控制器可以有效减小系统频率波动,附加直流频率限制器的调频死区、比例增益Kp1和Kp1等参数能对电网频率产生影响。其中,调频死区的减小能有效的降低系统频率的波动,但死区值不能设置过小,以防直流频率限制器频繁动作。比例增益Kp1和Kp2越大,系统频率波动越小,调频效果越理想,但是由于限幅环节,比例增益有调频能力上限。
In AC/DC hybrid power system, the fault of AC system will cause frequency oscillation between different interconnected system areas, then the pressure of conventional frequency regulation units will be increased and the valve will be moved frequently. The quick regulation ability and the short-term overload capacity of the DC transmission system are important in decreasing system frequency regulation pressure. This paper firstly model the frequency controller of DC transmission system, then the performance of additional dc frequency limiter is simulated in two area power system. The influence of DC frequency limiter control and the influence of parameters on system frequency stability are analyzed. The results showed that DC frequency limiter control DC frequency limiter control is effective in decreasing system frequency deviation, the dead zone of DC frequency limiter, KP1 and KP2 are the main factors. Decreasing the dead zone of DC frequency limiter can decrease system frequency deviation, however the dead zone of DC frequency limiter should be set in an appropriate value. The larger of KP1 and KP2, the smaller of system frequency deviation and the better performance of DC frequency limiter can be obtained. However, due to the limiting link, the valve of KP1 and KP2 have the upper limit.
作者
顾涤枫
万杰
王琦
姚坤
赵锡鑫
郭钰锋
GU Di-feng;WAN Jie;WANG Qi;YAO Kun;ZHAO Xi-xin;GUO Yu-feng(China power huachang electric power technology research Co., Ltd., Shanghai 200000, China;School of Electrical Engineering & Automation, Harbin Institute of Technology, Harbin 150001, China;Department of Electrical and Electronic Engineering, Hong Kong 999077, China)
出处
《节能技术》
CAS
2019年第3期221-225,共5页
Energy Conservation Technology
基金
国家重点研发计划项目(No.2016YFB0901903)
国家自然科学基金项目(No.51676054)
黑龙江省博士后基金项目(No.LBH-Z17067)
关键词
区域能源互联
交直流系统
频率振荡
调频压力
直流频率限制器
调频死区
regional energy interconnection
AC/DC hybrid power system
frequency oscillation
frequency regulation pressure
DC frequency controller
frequency regulation dead zone
