Study On Interactive Dispatch And Bidding Strategy Of Virtual Power Plants

With the great efforts to build a resource-saving and environment-friendly society, the low-carbon energy technologies have become the subject of today’s energy revolution. Electricity is the main way of energy supply and the forms of its production and consumption are changing. In the generation side, the large-scale low-carbon energy generation not only make the power grid uncertain, but also eliminate the units that are low efficiency and high energy consumption. In the demand side, distributed generation and electric vehicles accessing the traditional demand-side make it have the characteristics of source-load. These features will increase the difficulty of running a grid.The paper examines operation models of multiple virtual power plants (multi-VPP), aiming at unified management of the multi-VPP through VPP central controller (VPPCC), which reveals the controllability of the VPP as source and load in general. Three operation models will be introduced the VPP dispatch model: internal scheduling mode, multi-island operation mode and grid-connected mode. Considering interactive coordination between VPP and energy consumers, a demand response model based on Time-of-Use (TOU) pricing mechanism and interruptible loads (IL) is employed. And then the optimal results of VPP dispatch model are applied in the game theoretic model for multi-VPP dispatch. During the process of market competition, the bidding strategy of each VPP is determined by its affordable power output and fuel cost. To figure out the optimization results of the above-mentioned models, genetic algorithm and nonlinear programming (GANP) are adopted.Finally, taking the multi-VPP, which consists of various distributed generations (DG) and battery storage devices (BS), as an example, variables including transferred load, compensation capacity, optimal bidding strategy and profits for each VPP are obtained. From the analysis of the results, they show a good overall flexibility, interactivity and economy. The method serves as a foundation for dispatch of multi-VPP.