Abstract
The increasing penetration of distributed generators (DGs) exacerbates the risk of voltage violations in active distribution networks (ADNs). The conventional voltage regulation devices limited by the physical constraints are difficult to meet the requirement of real-time voltage and VAR control (VVC) with high precision when DGs fluctuate frequently. However, soft open point (SOP), a flexible power electronic device, can be used as the continuous reactive power source to realize the fast voltage regulation. Considering the cooperation of SOP and multiple regulation devices, this paper proposes a coordinated VVC method based on SOP for ADNs. First, a time-series model of coordinated VVC is developed to minimize operation costs and eliminate voltage violations of ADNs. Then, by applying the linearization and conic relaxation, the original nonconvex mixed-integer nonlinear optimization model is converted into a mixed-integer second-order cone programming model which can be efficiently solved to meet the requirement of voltage regulation rapidity. Case studies are carried out on the IEEE 33-node system and IEEE 123-node system to illustrate the effectiveness of the proposed method.
Highlights
R ENEWABLE energy resources, in the form of distributed generators (DGs), have been integrated into distribution networks dramatically in recent years [1]
This paper presents a coordinated voltage and VAR control (VVC) method based on soft open point (SOP) to minimize the operation costs and improve the voltage profile of active distribution networks (ADNs)
Considering the cooperation of SOP and multiple VAR regulation devices, a time-series optimization model of coordinated VVC is developed, in which the SOP, on-load tap changer (OLTC) and switchable capacitor banks (CBs) are all formulated as controllable devices
Summary
R ENEWABLE energy resources, in the form of distributed generators (DGs), have been integrated into distribution networks dramatically in recent years [1]. The above regulation devices can cooperate to maintain the voltage at a desired level and minimize the operation costs of ADNs. The coordinated VVC problem involves the continuous transmitted active power and reactive power outputs of SOP, and involves the discrete tap steps of OLTC and switchable units of CBs. Considering the coordination of multiple regulation devices on different time scales, the time-series optimization model is needed to be built and the real-time voltage regulation of SOP puts forward to a high requirement of optimization rapidity. The proposed model considers the cooperation of SOP and multiple regulation devices to eliminate voltage violations while minimizing the operation costs of ADNs. 2) By applying the linearization and conic relaxation, the original MINLP model is converted into the mixedinteger second-order cone programming (MISOCP) model, which can be efficiently solved to meet the demands of optimization rapidity with the real-time voltage regulation of SOP.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
