引用本文: | 颜湘武,王星海,王月茹.一种基于拉格朗日插值的微网虚拟功率下垂控制方法[J].电力系统保护与控制,2016,44(21):9-15.[点击复制] |
YAN Xiangwu,WANG Xinghai,WANG Yueru.A Lagrange interpolation based virtual power droop control method for microgrid[J].Power System Protection and Control,2016,44(21):9-15[点击复制] |
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摘要: |
低压微电网线路阻性成分大,下垂控制的直接应用会导致功率的耦合问题,而经过坐标变换后的虚拟功率下垂控制方法可以实现功率的解耦控制。针对采用固定的虚拟功率下垂系数无法保证微网孤岛运行时的频率与电压质量的问题,提出了一种基于拉格朗日插值方法的虚拟功率下垂控制策略,可以保证当微源的输出功率不超过允许范围时,其频率与电压符合电能质量要求。为了实现并联微源输出功率的合理分配,加入了功率分配鲁棒控制方法,使得虚拟无功功率的分配不受线路阻抗影响。利用该方案对通过不同线路并联的两台同容量逆变器并联进行了仿真,并与固定下垂系数方法进行了对比分析。结果表明,新型下垂控制方法可以保证优质的电能质量与并联微源间功率的合理分配。 |
关键词: 微电网 功率耦合 虚拟功率 拉格朗日插值 电能质量 功率分配 |
DOI:10.7667/PSPC151901 |
投稿时间:2015-10-28修订日期:2016-01-22 |
基金项目:国家高技术研究发展计划(863计划) (2015AA050603);河北省科技计划项目(15214307D);河北省自然科学基金项目(E2015502046);国家电网公司科学技术项目(SGTYHT/14-JS-188) |
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A Lagrange interpolation based virtual power droop control method for microgrid |
YAN Xiangwu,WANG Xinghai,WANG Yueru |
(School of Electrical and Electronic Engineering, North China Electric Power University, Baoding 071003, China) |
Abstract: |
In low voltage microgrid, the transmission line is relatively resistive and that is the reason why power coupling problem will be caused when conventional droop control method is adopted. Virtual power droop control method based on coordinate transformation could realize power decoupling control. Aiming at the problem that the frequency and voltage quality of the microgrid in islanding operation cannot be guaranteed by the fixed virtual power droop coefficient, a new virtual power droop control strategy based on Lagrange interpolation is proposed, which could guarantee the frequency and voltage quality while the output power of the inverter is within its allowable range. The robust power allocation method is adopted to achieve reasonable power allocation of parallel inverters, which makes the virtual power distribution not be affected by the line impedance. A parallel model of two inverters with different line impedances using the above strategy and the fixed droop coefficient strategy are simulated respectively. Simulation results indicate that the new droop control method could guarantee good power quality and reasonable power allocation between parallel micro-sources. This work is supported by National High-tech R & D Program of China (863 Program) (No. 2015AA050603). |
Key words: microgrid power coupling virtual power Lagrange interpolation power quality power allocation |