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The characteristic of off-grid wind generation system under the framework of coordination control, in which fixed pitch wind turbine with folding tail vane directly drives permanent magnet synchronous generator, is analyzed in this paper. A scheme, which has a buck converter between generator and load, is proposed for adjusting power output without mechanical sensors such as wind velocity and rotation...
The micro-grid that is composed of wind and solar power has wide prospects. Micro-grid has two kinds of operation mode that is grid-connected operation and independent operation. Unreasonable switching control will produce assault current that impact micro-grid operation. The smooth switching between two modes is needed to ensure the continuity of the load power supply. The control strategy of the...
In order to achieve the energy management of DC micro-grid, a multi-agent control method is proposed in this paper. The designed intelligent agent system has two layers. The lower layer agent is composed of photovoltaic power agent, wind power agent, energy storage agent and load agent. Those lower agents collect the data from field devices, and each agent analyzes the data, then the information from...
In order to improve the waveform quality and reduce the harmonics of inverter for small wind power system (SWPS), a single phase sinusoidal inverter with high-frequency link is proposed in this paper. Two BP neural network (BPNN) controllers are designed to control the proposed inverter. One BPNN control the indirect DC/DC converter part to obtain stable DC voltage, and the other BPNN control the...
A power controller is designed to improve the efficiency and enhance the reliability for small wind power system (SWPS) in this paper. A Buck converter is employed as main power circuit and a single-chip microcomputer C8051F410 is used as control unit in the designed power controller. The detailed introduction of the controller including the hardware circuits and the software flow of the related code...
A single-phase sinusoidal inverter with high-frequency link for small wind power system is proposed to improve reliability and energy conversion efficiency in this paper. A fuzzy self-tuning PID controller is designed for the proposed inverter. A model is set up and simulated in MATLAB. The simulation result shows that the single-phase sinusoidal inverter has high steady-state accuracy and dynamic...
The performance characteristic for off-grid wind power system is analyzed in this paper. A control strategy which employs fuzzy PID controller to achieve power control under different operating mode without both measuring wind speed and applying mechanical sensors such as wind velocity and rotation speed sensors is also presented. The wind power system operates at the state of maximum power tracking...
Both energy flow and operation characteristics of stand-alone wind/PV hybrid power systems are analyzed to achieve its optimal and reliable operation in this paper. The transition of its various operation modes and working states is also established. A coordination control method that contains maximum power tracking control, load tracking control, charge and discharge control for battery as well as...
The operating characteristics of stand-alone PV system are analyzed in order to improve the efficiency of PV arrays and prolong battery life in this paper. The transition diagram of its various working states is also established. An energy management method that integrates maximum power tracking control, load power tracking control, fast charge with variable current and discharge control for battery...
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