Three-Vector-Based Low Complexity Model Predictive Control for Soft Open Point

Abstract

Soft open point (SOP) can improve the flexibility and reliability of power supplies; thus, they are widely used in distribution network systems. Traditional single-vector model predictive control (SV-MPC) can quickly and flexibly control the power and current at both ports of the SOP. However, SV-MPC can only select one voltage vector in a sampling time, producing large current ripples, and power fluctuations. In order to solve the above problems, this paper proposes a three-vector-based low complexity model predictive control (TV-MPC). In the proposed control method, two effective voltage vectors and one zero voltage vector are selected in a sampling time. For the two-port SOP, methods are given to judge the sectors on both sides and select the voltage vectors. Furthermore, the calculation method of the distribution time is proposed as well. Finally, the effectiveness of the proposed method is verified by steady-state and dynamic-state simulation results compared with the SV-MPC.

Full-Order Terminal Sliding-Mode Control for Soft Open Point

“…To demonstrate the effectiveness of the proposed method under a serious condition, a model predictive control (MPC), a linear sliding-mode control (LSMC) and a full-order sliding-mode control (FOSMC) were used to design the controllers for performance comparison in MATLAB/Simulink. The parameters of the SOP are listed in Table 1 [14], and the controllers design parameters of the rectifier side and the inverter side are listed in Tables 2 and 3, respectively.…”

“…To enhance the dynamic performance, a model predictive controller is proposed in [13] to replace the PI controller of the currentloop. In [14], a three-vector-based MPC is proposed to reduce the current ripple in SOP. However, MPC is a type of control method that depends on the model, which has unavoidable sensitivity to the parameter perturbation of the SOP [15].…”

“…With its excellent real-time power controllability, the SOP has been widely used in electricity distribution networks to deal with the problems caused by the access of distributed power generation equipment to the distribution network. The related work about the model and control strategy of the soft open point can refer to [14], and the related work about the sliding-mode control methods can refer to [31].…”