Research on Operation Strategy of Virtual Power Plant and Distributed Control of DG

Abstract

ObjectivesVirtual power plant is usually composed of distributed generator (DG). When the system lacks power grid support, practical and reasonable comprehensive operation strategies and accurate control methods are needed to ensure the smooth operation of virtual power plant.MethodsAn operation strategy based on system fluctuation value was proposed. Then, aiming at the problem of generation control of distributed generators in the system, a distributed finite-time controller was designed. The amplitudes of voltage and frequency were adjusted to nominal values within a finite time, and the active power was distributed among each DG unit. Different from the traditional centralized control strategy, the proposed control method is based on distributed junction, which only requires information exchange between adjacent DG units through sparse communication network.ResultsThe feasibility of the proposed control method and its robustness to the uncertainty of model parameters and load variation were verified by simulation experiments.ConclusionsCompared with previous studies, the proposed operation strategy divides the system operating conditions in more detail, effectively improving the stability and security of the system.

Keywords

• virtual power plant
• operation strategy
• primary control
• secondary control
• finite-time control