In order to improve the level of new energy consumption and reduce the dependence of the power system on traditional fossil energy, this paper proposed a bi-level optimization model for virtual power plant member selection by means of coordination and complementarity among different power sources, aiming at optimizing system economy and clean energy consumption capacity and combining it with the time sequence of load power consumption. The method comprises the following steps: (1) The processing load, wind power, and photovoltaic data by using ordered clustering to reflect the time sequence correlation between new energy and load and (2) uses a double-layer optimization model, wherein the upper layer calculates the capacity configuration of thermal power and energy storage units in a virtual power plant and selects the new energy units to participate in dispatching by considering the utility coefficient of the new energy units and the environmental benefit of the thermal power units. The Latin hypercube sampling (LHS) method was used to generate a large number of subsequences and the mixed integer linear programming (MILP) algorithm was used to calculate the optimal operation scheme of the system. The simulation results showed that by reducing the combination of subsequences between units and establishing a reasonable unit capacity allocation model, the average daily VPP revenue increased by RMB 12,806 and the proportion of new energy generation increased by 1.8% on average, which verified the correctness of the proposed method.
The construction of the information-based and intelligent platform can completely reform the management mode of enterprises, effectively improve the production efficiency and competitive strength of enterprises. In view of the importance of information and intelligence construction, domestic electric power enterprises continuously build and transform information platform based on their own business needs. In this paper, starting from the background of the construction of the Power Grid Dispatching Command Network Interactive System, the dispatching standard and the overall idea of systems engineering, the interactive mode and system structure scheme of the power grid dispatching command network based on the national and industry standards are proposed, based on the computer network, the interactive supporting mode of dispatching command network is constructed to form a comprehensive and efficient dispatching command network, which ensures the flexibility and reliability of dispatching command interaction and improves the level of dispatching command.
Different types of distributed generation have different grid-connected modes, control links and basic models, and each type has different effects on 10kV power grid, so corresponding models should be established to analyse it. This paper focuses on the research of inverter-based distributed generation, and analyses the impact of different capacity, installation position and fault location on the protection device.
The distribution loss of the distribution network has changed greatly because of the access of distributed generation, which has a certain impact on the power quality of the distribution network. In order to solve the above problems, this paper constructs a 10 kV grid model containing distributed generation, studies the impact of distributed generation on the distribution of network loss, and grasps the characteristics of network loss changes under different scales of distributed generation and different grid-connected conditions. Finally, this paper constructs a mathematical model containing distributed generation and proposes control measures to ensure the safe and stable operation of the grid.
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