主动配电网中分布式电源和微网的运行域

Dispatchable Region of Distributed Generators and Microgrids in Distribution Systems

主动配电网以其较强的控制能力可以接纳大量分布式电源(DG),文章在配电系统安全域(distribution system security region,DSSR)的基础上提出了DG及微网的运行域。首先,考虑DG及微网的接入位置、出力大小以及渗透率等因素对配电网的影响,提出了DG及微网运行域的概念:运行域描述了保证配电网安全前提下的DG及微网出力范围,能方便地用于对DG及微网的主动调度。其次,提出了DG及微网运行域的数学模型及计算方法,能计算得到满足电压、潮流等约束下不同类型DG及微网的运行域。最后,利用IEEE 33节点算例,计算得出PQ型和PV型的DG及微网运行域,并与不含DG和微网的负荷运行域进行对比分析,验证了所提方法的有效性。DG或微网的加入导致运行域面积增大,拓扑结构更加复杂;相同条件下,PV型微网比PQ型微网运行域面积更大。

Active distribution network can accommodate more distributed generators （DG） due to its stronger control ability. This paper proposes dispatchable region of distributed generators and microgrids （DGDR） based on distribution system security region. Firstly, DGDR concept is proposed after analyzing influencing factors such as placement, output and penetration of DGs and microgrids （MG）. Output power range of DGs and MGs can be calculated with dispatchable region. Secondly, mathematical model and algorithm of dispatchable region is proposed, with which dispatchable region of different DGs and MGs can be obtained within voltage and power flow constraints. Finally, with numerical example of IEEE 33, validity of the proposed method in calculating PQ and PV type DG is proved. Obtained region is compared to dispatchable region with load buses only. Penetration of DGs or MGs causes DGDR area increase and more complex DGDR topology. Under the same conditions, PV type DGDR area is larger than PQ type.