The Study Of Wind-Solar Hybrid Power Station Control And Monitor System

Wind power and solar photovoltaic technologies and their applications are one of the most significant ways to develop the use of green renewable energy, improve the ecological environment and people's lives. Meanwhile, it is also an integration project of power electronics, control theory, etc. Thus the study of this project has the important value of academic research, and also has great economic and social benefits. However, since the influence of weather conditions, climate, cost impact, etc., the wind power and solar photovoltaic power generation was not well developed, which was only as a complementary way. In recent years, the wind-solar power generation system as an effective way to make up these shortcomings, and the study has become the hot spot at home and abroad. In addition, the researches of wind-solar hybrid generating system focus on controlling and data monitor, which mainly include the maximum power point tracking (MPPT) methods, controller technologies, inverter technologies and network technologies, and power station data monitor technologies. Currently, the technologies are more mature in advanced countries, but just started in China, the theories and technologies are not well developed, and researchers only studied one of the main project or parts of the project. In this thesis, I focus on comprehensive control of technology research, which includes a new maximum power point tracking (MPPT) method; design a new controller, an inverter and data monitor system, and preliminary study network technology. The results of the study mainly include four aspects as following:1. Improving a new Maximum Power Point Tracking (MPPT) methodSeveral maximum power point tracking (MPPT) methods are analyzed firstly,then raised an improved disturbance observer method based on optimal gradient method. Since the PV solar cell characteristic curve is nonlinear, and the PV model is a very complicated function, so this MPPT method is difficult to realize actually. This thesis introduced a simple PV model, applied it to MPPT method, and calculated a new MPPT function.2. Designing a wind-solar hybrid generating system controllerThe design of wind-solar hybrid generating system controller is based onPIC16F716 chip. Also, the study developed a prototype, and analyzed the functions and characters by experiments. In addition, the controller has several functions, which includes charging the battery over charge, protecting battery, protecting overvoltage, protecting solar cells reverse, delaying action, temperature compensation, fan control, etc.3. Designing a wind-solar hybrid generating system inverterThe inverter including DC/DC converter design and DC/AC inverter design. Firstly, DC/DC converter is based on SG3526 chip push-pull DC/AC circuits, which can convert 12V DC output from the battery into 250V DC; Secondly, DC/AC inverter control circuit is based on DSP TMS320F2812, and inverts the DC/250V output into AC 220V/50Hz.4. Design a wind-solar hybrid generating system data monitor systemThe data monitor system is based on P89LPC9408 chip, which is used to realize the functions of monitor and processing the currents and voltages from solar cells, batteries, fans, inverters, wind sensors, temperature signal sensors, etc. And the signals are communicated with the host computer through the RS-485 bus, which is used to monitor power station in any time.