RoCoF下垂控制的直驱式风电系统惯量特性分析  被引量:6

Inertia Characteristic Analysis of RoCoF Droop Control Based Direct-driven Wind Power System

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作  者:刘毅力[1] 李丁 李明贤 张东辉 查雨欣 LIU Yili;LI Ding;LI Mingxian;ZHANG Donghui;ZHA Yuxin(School of Electronics and Information,Xi’an Polytechnic University,Xi’an 710089,China;College of Electrical and Power Engineering,China University of Mining and Technology,Xuzhou 221116,China;College of Automation Engineering,Nanjing University of Aeronautics and Astronautics,Nanjing 211106,China;School of Automation,Nanjing Institute of Technology,Nanjing 211167,China)

机构地区:[1]西安工程大学电子信息学院,西安710089 [2]中国矿业大学电气与动力工程学院,徐州221116 [3]南京航空航天大学自动化学院,南京211106 [4]南京工程学院自动化学院,南京211167

出  处:《电源学报》2020年第6期94-104,共11页Journal of Power Supply

摘  要:微电网作为新能源消纳的有效方式受到了广泛关注。相比于传统电力系统,由电力电子装置主导的微电网系统,在外界扰动时更容易引起电网频率偏差和频率变化率RoCoF(rate of change of frequency)过大。为此,首先提出了一种基于LPF的RoCoF下垂控制策略,通过耦合RoCoF和母线电容电压,使得在扰动产生时快速释放电容能量来补偿系统不平衡功率,从而提高频率响应的执行速度,能够有效改善RoCoF暂态过程的稳定性。其次,类比传统同步机在机电时间尺度下的动态分析理论,建立了风电系统在直流电压时间尺度DVT(DC-voltage timescale)下的动态模型,基于经典的电气转矩分析方法,揭示了所提模型控制环节对风电系统惯性的影响规律。然后,在同等电容裕量下对不同控制策略进行了对比,结果表明:电容能量释放的快慢,能够直接影响RoCoF的抑制效果,且随着下垂系数Kh的增加和LPF截止频率ωc的减少,网侧逆变器的有功响应速度相应增加。最后,通过实验验证了所提控制方法的有效性和分析结论的正确性。As an effective way to consume new energy,microgrid has received extensive attention.Compared with the traditional power system,the microgrid system dominated by power electronic devices is more likely to cause grid frequency deviation and the rate of change of frequency(RoCoF)to be too large under external disturbances.To solve this problem,an RoCoF droop control strategy based on LPF is proposed at first.By coupling the RoCoF and bus capacitor voltage,the capacitor energy is quickly released under disturbances to compensate for the unbalanced power of the system,thereby improving the execution speed of frequency response.As a result,the stability of RoCoF transient process is effectively improved.Second,by analogy with the dynamic analysis theory for the traditional synchronous machines at the electromechanical timescale,a dynamic model of the wind power system at the DC-voltage timescale(DVT)is estab-lished.Based on the classic electrical torque analysis method,the influences of the proposed model control link on the inertia of the wind power system are revealed.Then,by comparing different control strategies under the same capacitance margin,it is shown that the speed of energy release from the capacitor can directly affect the suppression effect of RoCoF.In addition,as the droop coefficient Kh increases and the LPF cutoff frequencyωc decreases,the grid-side active response speed of the inverter increases accordingly.Finally,the effectiveness of the proposed control method and the correctness of the given conclusions were verified by experiments.

关 键 词:直驱式风电系统 下垂控制 频率偏移 惯量阻尼 频率变化率 

分 类 号:TM464[电气工程—电器]

 

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