| As the issues of environmental pollution and depletion of fossil energy become extremely serious these years, the proportion of renewable energy such as photovoltaic generation has increased to a high level in power supply system. However, the randomness and intermittence of photovoltaic generation brought a lot of negative effects on power system planning and operation. To solve this problem, energy storage technology has been widely used in power system recently. Considering the complementary characteristics in configuration mode and application scenarios of centralized energy storage and distributed energy storage, hierarchical energy storage system(HESS) can combine the multiple function of various energy storage mode, which will contribute a lot in improving the permeability of photovoltaic generation and providing ancillary services to the grid. This paper studied the problems of the function module design of energy management system platform(EMS platform) for HESS and the techno-economic applicability of HESS used in distribution network with distributed photovoltaic generation.In order to satisfy the requirements of HESS in energy management and control, the structure of HESS and its application function is established, and the hierarchical control strategy is proposed in this paper. The hierarchical control strategy including distributed photovoltaic control, battery control, PQ control and droop control for HESS structure is discussed in detail, simulation results show that the hierarchical control strategy is effective, thus providing feasible method for the concrete implementation of EMS platform.Considering the actual requirements of EMS platform in data acquisition, transmission, processing and storage, the data support system based on heterogeneous computing resource pool of regional distribution network is established in this paper. In the support system, the deployment architecture of EMS platform based on IEC61970 standard is discussed, the software interface based on CORBA(Common Object Request Broker Architecture) and data interface based on SOCKET mechanism is used to support data transmission, and the hardware and software design of Multi-function data terminal for data acquisition is accomplished, application verification results show that the structure of data support system can provide important contribution for the deployment of EMS platform.In order to evaluate the techno-economic applicability of HESS, the HESS index system for multi interest group is established, and the comprehensive evaluation algorithm based on analytic hierarchy process(AHP) and technique for order preference by similarity to ideal solution(TOPSIS) is proposed. Furthermore, the variation coefficient method is adopted to calculate the objective weight, and the improved TOPSIS method can increase the evaluation precision by calculating the equilibrium performance as well as the overall ability of different objects. Numerical of HESS under different technical scheme is proposed, results show that comprehensive evaluation algorithm has preferable reliability, the work in this chapter provide guidelines for the selection of HESS technical solutions.The study results of this thesis provide powerful references for the application of hierarchical energy storage system. |
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