摘要
针对传统下垂控制受到微网线路阻抗特性等因素的影响难以实现功率精确分配的问题,提出一种适用于低压微网孤岛运行模式下的新型有功-频率(P′-f)和无功-电压微分(Q′-dU/dt)功率控制策略。该策略基于电压幅值变化率(dU/dt)的电压补偿控制方法来实现无功功率精确分配,同时可使系统电压保持在合理的稳定状态并保证相应的动态性能。小信号建模分析表明控制方程系数的匹配对系统瞬时响应影响较大,合理的参数设计有利于提高系统动态性能。对孤岛模式下不同的系统状态进行仿真和对比分析,验证了所提控制策略的有效性。
Traditional droop control can hardly realize the accurate power assignment in microgrid because of some influencing factors,such as the characteristics of line impedance,for which,a strategy of active power-frequency（P′-f） and reactive power-voltage differential（Q′-dU / dt） power control is proposed. The voltage compensation control method based on voltage amplitude variation rate（d U / d t） is applied to realize the accurate reactive power assignment while the system voltage is maintained stable in a certain level and the dynamic performance is insured. The small signal model analysis shows that,the instantaneous system response is greatly affected by the coefficients of control equation and the rational parameter design improves the dynamic performance of system. Different system states of autonomous microgrid are simulated and analyzed,which verifies the effectiveness of the proposed control strategy.
出处
《电力自动化设备》
EI
CSCD
北大核心
2014年第6期122-128,134,共8页
Electric Power Automation Equipment
基金
国家自然科学基金资助项目(50977029)
河北省自然科学基金资助项目(E2013502074)~~
