A Novel Decentralized Coordinated Voltage Control Scheme for Distribution System With DC Microgrid

This paper proposes a novel decentralized coordinated voltage control (CVC) scheme for a distribution system consisting of dc microgrid (DCMG), doubly fed induction generator-based wind system, on-load tap changer (OLTC), and DSTATCOM. The proposed scheme considers the response time of various voltage regulating devices and assigns a master/slave role based on the operating conditions of the grid and availability of the device. This paper offers a distinctive solution to optimally utilize the voltage regulating devices which do not take part in the contingency situation such as OLTC and DCMG converter in order to achieve the following objectives: 1) A better voltage regulation and increased reactive power reserve during normal operating conditions of the grid. 2) To improve the transient performance of the system in terms of reduction in postfault voltage recovery time. Two modified IEEE 33 bus systems are implemented in a real-time digital simulator platform to test the effectiveness of the proposed CVC scheme. Furthermore, power hardware in loop (PHIL) experimentation is conducted with a reduced scale DCMG hardware setup to test the stability, feasibility, and practicability of the proposed scheme. The simulation and PHIL results demonstrate that the proposed CVC scheme provides a better solution compared to existing work by fulfilling the set objectives.