主从控制下直流微电网稳定性分析及有源阻尼控制方法

发布时间：2019-05-18 16:58

【摘要】：直流微电网系统阻抗的复杂性易造成系统不稳定,以往研究中经常忽略系统节点之间的阻抗,或者给出的稳定性判据不能适用于环网。给出了一种基于阻抗的主从控制下直流微电网系统稳定性判据,并提出了一种基于双准比例谐振(proportional resonance,PR)控制器的有源阻尼控制方法。首先,利用单元连接法对各电源、恒功率负载等功率模块进行戴维南/诺顿等效,得到相应的阻抗/导纳,结合系统节点导纳矩阵给出了一种基于阻抗的主从控制直流微电网的稳定性判据。该判据能够分析含电压控制型主电源、电流控制型从电源、恒功率负载、系统节点间阻抗等复杂直流微电网的稳定性;只与各部分的阻抗或导纳相关,且系统结构可为环形。其次,通过双准PR控制器在电压控制型主电源输出阻抗中串入有源阻尼,能有效降低输出阻抗幅值的峰值,提高系统稳定性,同时不改变输出阻抗的低频段幅值。最后,三机四节点环形直流微电网的仿真结果验证了所提稳定性判据和有源阻尼控制方法的有效性。
[Abstract]:The complexity of the impedance of DC microgrid system is easy to cause the system instability. The impedance between the system nodes is often ignored in the previous research, or the stability criterion given can not be applied to the ring network. In this paper, a stability criterion of DC microgrid system based on impedance master-slave control is presented, and an active damping control method based on double quasi-proportional resonance (proportional resonance,PR) controller is proposed. Firstly, the Davenan / Norton equivalent of each power supply, constant power load and other power modules is carried out by using the unit connection method, and the corresponding impedance / admittance is obtained. Combined with the node admittance matrix of the system, a stability criterion of master-slave control DC microgrid based on impedance is presented. This criterion can analyze the stability of complex DC microgrid, such as voltage-controlled main power supply, current-controlled slave power supply, constant power load, inter-node impedance and so on, which is only related to the impedance or admittance of each part, and the system structure can be annular. Secondly, the double quasi-PR controller can effectively reduce the peak value of the output impedance, improve the stability of the system, and do not change the amplitude of the low frequency section of the output impedance by serial active damping in the output impedance of the voltage-controlled main power supply. Finally, the simulation results of three-machine four-node annular DC microgrid verify the effectiveness of the proposed stability criterion and active damping control method.
【作者单位】：浙江大学电气工程学院;国网江西省电力公司经济技术研究院;
【基金】：国家自然科学基金(51377142) 浙江省自然科学基金(LY16E070002) 国家重点研发计划项目(2016YFB0900605) 国家电网公司科技项目(SGZJ0000BGJS160031)~~
【分类号】：TM727

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