CAJ | 학술논문

大规模智能充电站可以很好地满足和调节电动汽车的充电需求，但同时也不可避免地给电网的稳定性运行带来新的影响和挑战。基于阻尼转矩分析法(damping torque analysis，DTA)，着重探讨智能充电站的接入对于输电网动态稳定性的影响。为了简化分析，单机无穷大系统将用于模拟配电网与外部输电网。配电网中的智能充电站群被视为一个接入输电网的等值智能充电站。分析得出，在大规模智能充电站的设计中，充电容量对于小干扰稳定性中的阻尼比有很大的影响。在其最佳充电容量下充电，将会最有利于保持系统的动态稳定，系统阻尼比也保持最大。根据所建立的Phillips-Heffron模型可知，在智能充电站的有功和无功控制通道上设计并加装稳定器，能够有效地提高系统阻尼，更快地抑制联络线上的功率振荡。算例分析验证了所得结论。
대규모지능충전참가이흔호지만족화조절전동기차적충전수구，단동시야불가피면지급전망적은정성운행대래신적영향화도전。기우조니전구분석법(damping torque analysis，DTA)，착중탐토지능충전참적접입대우수전망동태은정성적영향。위료간화분석，단궤무궁대계통장용우모의배전망여외부수전망。배전망중적지능충전참군피시위일개접입수전망적등치지능충전참。분석득출，재대규모지능충전참적설계중，충전용량대우소간우은정성중적조니비유흔대적영향。재기최가충전용량하충전，장회최유리우보지계통적동태은정，계통조니비야보지최대。근거소건립적Phillips-Heffron모형가지，재지능충전참적유공화무공공제통도상설계병가장은정기，능구유효지제고계통조니，경쾌지억제련락선상적공솔진탕。산례분석험증료소득결론。
Large-scale smart charging stations can effectively satisfy and control the charging demands of tremendous plug-in electric vehicles (PEVs). But simultaneously their penetrations inevitably induce new challenges to the operation of power systems. In this paper, damping torque analysis (DTA) was employed to examine the effects of the integration of smart charging station on the dynamic stability of the transmission system. While the discussion has focused on the damping of power system oscillations in the transmission system, and the smart charging station in the distribution system can be considered as an equivalent one with the proper control connecting to the specified bus. A single-machine infinite-bus power system with a smart charging station which denoted the equivalent of several ones was used for analysis. From the results obtained from DTA, it reveals that in the view of the damping ratio, the optimal charging capacity is better to be considered in the design of the smart charging station. Under the proposed charging capacity, the power system can achieve the best maintained dynamic stability, and the damping ratio can reach the crest value. According to the established Phillips-Heffron model in the previous analysis, the phase compensation method was utilized to design the stabilizer via the active and reactive power regulators of the smart charging station respectively. With the help of the stabilizers, damping of the system oscillation under certain operating conditions can be significantly improved, and the power oscillation in the tie-line can be suppressed more quickly. The results of the case study verified the conclusions.