Research on Double-Layer Coupling Voltage Regulation Strategy for Distribution Network Containing High Permeability Distributed Generation

Abstract

The penetration rate of distributed power sources in the distribution network continues to increase, and the problem of voltage limit violations in the distribution network has gradually become prominent. This paper combines the linearization method and the voltage sensitivity to propose a two-stage linearization voltage regulation strategy. In the first stage, the optimal voltage regulation model is established. Aiming at the problem that the traditional model is difficult to solve by non-convex and nonlinearity, this paper analyzes the influence of transformer taps and distributed power reactive power on network loss and node voltage, and constructs linearized voltage regulation. The model effectively reduces the calculation complexity and calculation time of the optimization problem. In the second stage, in view of the uncertain factors in actual operation, an in-situ compensation based on droop characteristics and a comprehensive voltage adjustment strategy based on voltage sensitivity are proposed. Based on the linearized scheduling results of the first stage, the output of photovoltaic power is reproduced. The regulation ensures the robustness of the voltage regulation algorithm, and the effectiveness of the method proposed in this paper is verified through case analysis.