考虑RoCoF约束的新能源电力系统惯量分区配置方法

REGIONAL INERTIA CONFIGURATION METHOD OF RENEWABLE ENERGY POWER SYSTEM CONSIDERING RoCoF CONSTRAINT

分析了大规模新能源电力系统按分区配置惯量的必要性,并对此给出电压源型换流器采用功率同步控制以配置虚拟惯量的建议。据此,提出一种考虑频率变化率约束的惯量分区配置方法。该方法先将待研究系统按频率响应特性的一致程度进行分区,然后结合分区内部扰动、分区间联络线上功率变化和负荷电压响应等因素计算扰动情况下各分区的最大不平衡功率,从而以分区为单位得到惯量需求并进行配置。最后,基于华东电网规划算例,说明了苏北沿海电网等分区的惯量配置需求,并验证所提惯量分区配置方法的有效性。

The necessity of configuring inertia regionally for large-scale renewable energy power system is analyzed.To achieve this goal,a suggestion is put forward,which says that the power synchronization control can be utilized to configure virtual inertia for voltage source converters.Based on these,a regional inertia configuration method considering a constraint on the rate of change of frequency(RoCoF)is proposed.In this method,firstly,the system to be studied is partitioned according to the consistency of frequency response.Then,the maximum unbalanced power of each region under disturbance is calculated by combining the internal disturbance in the region,the change of the power on transmission lines between different regions and the load response to the disturbed voltage.After that,the inertia demand could be obtained and the inertia configuration could be carried out regionally.Finally,in the case study of East China Power Grid,the inertia requirement of each region in the system is illustrated,and the effectiveness of the proposed regional inertia configuration method is verified.