[关键词]
[摘要]
大规模新能源发电并网降低了系统惯性和一次调频能力。新能源同步机(MGP)可以提供无延时的、真实的旋转惯量。介绍了新能源经MGP并网的系统结构和惯量水平,计算了MGP对初始频率变化率(ROCOF)的抑制作用。然后基于光伏(PV)驱动MGP并网的直流电压反馈控制策略,提出了一种定减载率控制算法,并引入频率反馈环,形成PV调用有功储备驱动MGP参与电力系统调频的综合控制策略。通过3机9节点仿真系统对减载控制算法进行验证,并进一步对比了源、网两端功率波动下PV采用不同方式并网参与系统一次调频的效果。结果表明,在综合控制策略下PV经MGP并网能为系统提供更强的频率支撑。
[Key word]
[Abstract]
The integration of large-scale renewable energy source reduces the rotational inertia and primary frequency regulation capability of power systems. Motor-generator pair (MGP) system can provide the real rotational inertia without delay. The system structure and inertia level of a renewable energy integration MGP are introduced. The damp effect of MGP on the initial rate of change of frequency (ROCOF) is calculated. Based on the DC voltage feedback control strategy of MGP driven by photovoltaic (PV) integration, a constant load shedding control algorithm is proposed. A frequency feedback loop is introduced, and then the integrated control strategy of MGP driven by PV participating in power system frequency regulation is formed. Finally, through a 3-bus-9-node simulation system, the load shedding control algorithm is verified. The system primary frequency regulation effect of PV integration by different methods is compared in the conditions of the power fluctuating of source side and grid side. The result shows that under the integrated control strategy, PV integration driving MGP can supply stronger frequency support to the system.
[中图分类号]
[基金项目]
贵州电网公司科技项目(067600KK52180007)