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Combined cooling, heating, and power (CCHP) systems have been widely applied in various kinds of buildings. Most operation strategies for CCHP microgrids are designed based on day-ahead profiles. However, prediction error for renewable energy resources (RES) and load leads to suboptimal operation in dispatch scheduling. In this paper, we propose an online optimal operation approach for CCHP microgrids...
A two-stage energy management strategy for CCHP microgrid is proposed in this paper. The first stage, named day-ahead scheduling stage (DASS), is an economic dispatch model to minimize the operating cost. This stage provides the operation plans including commitment or output power of each unit, which is solved by a revised particle swarm optimization. The second stage, called real-time adjusting stage...
Based on the research VSCF doubly-fed wind power systems, it Focus on the line side converter three level. The neutral point clamp in three level converter as line side converter, and it gives its topology structure and equivalent circuit. In PSCAD /EMTDC software environment, the mathematical modeling and system simulation are given, and the simulation results show that the system realized the dc...
The steady and uniform Alpha discharge phenomenon between all metal slab waveguide were clearly recorded with Nikon camera, the variation of the luminous intensity was firstly analyzed and studied for the Alpha discharge experiment, in which the discharge is taking place between the parallel all metal plate electrodes with the two bright glows, the visible emission intensity is greatest near the parallel...
The nonlinear fuzzy PID control strategy, which combines nonlinear control, fuzzy control and PID control, is put forward in this paper to deal with the control of a class of nonlinear and large inertia plants under complicated and large variation conditions. The proposed control strategy can adjust control parameters timely and appropriately according to the dynamic characteristics of the systems,...
In order to ensure the grid side converter and static reactive compensator in wind power systems run safely and reliably under unbalanced grid voltage, it is the basic requirement that the phase and frequency of the positive sequence fundamental component of grid voltage are obtained quickly and accurately. Because the dynamic behavior of the phase locked loop (PLL) based on the synchronous reference...
The stator flux-oriented vector control theory is adopted for megawatt double-fed induction generator (DFIG). Rotor excitation current is regulated according to grid voltage and rotor speed to realize no-load grid connection of DFIG. The control strategy is switched after grid connection successfully to realize maximum power point tracking (MPPT) and power decoupled control. The control of the rotor-side...
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