High-power photovoltaic array simulator control method based on fuzzy PI control
A technology of fuzzy controller and photovoltaic array, which is applied in the field of solar photovoltaic power generation, can solve the problems of not considering the control of open circuit voltage, uncontrolled simulator, and inability to achieve high-power photovoltaic array simulator, so as to improve anti-interference and The ability to resist instability, reduce the process of PI parameter adjustment, and reduce the effect of system calculation
Active Publication Date: 2017-05-10
GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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[0003] At present, research on photovoltaic array simulators is mostly focused on the overall structure design of the simulator, such as the patent "A Solar Cell Simulator" and "A Simulator that Can Simulate the Output Characteristics of Photovoltaic Array Modules Under Any Working Condition", etc. The high-performance control method of the simulator is not mentioned; moreover, most photovoltaic array simulators on the market use BUCK DC converters plus traditional PI control structures. This control method has many shortcomings. First, the BUCK converter The size of the output voltage is limited by the device and the level of the input voltage. Under the existing device conditions, it is impossible to achieve a high-power photovoltaic array simulator; in addition, the BUCK converter is limited by the circuit structure itself, and can only charge but not discharge , so that its dynamic performance is greatly limited; moreover, although the traditional PI controller is simple, it also has shortcomings such as poor dynamic performance and weak ability to suppress interference
[0004] In addition, the design of most simulators does not consider the control of the open circuit voltage at no-load. If the control of the open circuit voltage is lacking, the output voltage may be unstable. For example, when the simulator is no-load, if the feedback current signal The introduction of some interference signals will cause the output voltage to fluctuate and jitter, and even cause uncontrolled boosting of the simulator, which poses a challenge to the safety of the device
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[0031] The purpose of the present invention is to overcome the shortcomings of the control methods of traditional photovoltaic array simulators, and propose a high-power photovoltaic array simulator control strategy based on the combination of fuzzy control and PI control. Combining the respective advantages of fuzzy control and PI control, the main For the control of high-power photovoltaic array simulators based on but not limited to three-phase PWM rectification, and considering the safety and stability of actual products, a separate control loop is designed especially for the open circuit voltage of the simulator. The control structure of the present invention is simple, and the control effect is good, that is, it can improve the dynamic response capability of the single PI controller, and can make up for the defect of low steady-state precision caused by the single fuzzy control, and at the same time, the control of the open circuit voltage is also the key point of the whol...
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The present invention discloses a high-power photovoltaic array simulator control method based on fuzzy PI control. The method employs a three-phase PWM rectifying circuit, and a control structure comprises: a V-I characteristic curve module, a fuzzy controller, a PI controller, a Park conversion module, a Clark conversion module and an SVPWM controller. The control method comprises: a rated open-circuit voltage Voc is compared to a virtual voltage Vdc to obtain error signals when opening a circuit, a reference current Idc_ref is compared to an actual current Idc to obtain error signals when load, the fuzzy PI controller is operated to obtain control reference signals, and the control signals are outputted through the SVPWM. The high-power photovoltaic array simulator control method based on the fuzzy PI control introduces the simulator open circuit voltage to individually control the loop so as to ensure the safely and stably operate the system; and moreover, the high-power photovoltaic array simulator control method is connected in series with the fuzzy PI controller to effectively combine the advantages so as to ensure the good dynamic performance of high stable state precision of the system.
Description
technical field [0001] The invention relates to the technical field of solar photovoltaic power generation, in particular to a control method for a high-power photovoltaic array simulator based on fuzzy PI control. Background technique [0002] Photovoltaic array simulator is a key component for researching photovoltaic power generation systems. In the development and testing of photovoltaic array power generation systems, compared with using photovoltaic array components for testing, photovoltaic array simulators can not only save the area of research and development sites, reduce research and development costs, and shorten the development cycle. ; And it can also simulate the photovoltaic output characteristics under various working conditions without relying on the natural environment, which provides great convenience for research. [0003] At present, research on photovoltaic array simulators is mostly focused on the overall structure design of the simulator, such as t...
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Login to View More IPC IPC(8): G05B13/04
CPCG05B13/042
Inventor宁佳张继元舒杰王浩吴昌宏黄磊吴志锋崔琼
OwnerGUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI