Variable droop coefficient control method based on photovoltaic power station operating characteristics and light intensity
A technology of photovoltaic power station and operation characteristics, applied in photovoltaic power generation, electrical components, circuit devices, etc., can solve the problem that photovoltaic cannot fully participate in frequency regulation and voltage regulation, etc., to improve dynamic stability and reduce frequency and voltage deviation. , the effect of improving the control accuracy
Active Publication Date: 2022-08-09
GLOBAL ENERGY INTERCONNECTION RES INST CO LTD +2
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Problems solved by technology
The conventional average distribution strategy cannot fully exploit the potential of photovoltaics with different power generation capabilities to participate in frequency regulation and voltage regulation
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[0066] Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0067] The embodiment of the present invention provides a variable droop coefficient control method based on the operating characteristics and light intensity of photovoltaic power plants, and the specific steps include:
[0068] Step 1: Determine the basic model of active power-frequency control and the basic model of reactive power-voltage control. In order to give full play to the potential of photovoltaic power generation to participate in the frequency regulation and voltage regulation of the system, when the deviation of the system frequency or the deviation of the photovoltaic grid connection point is small, the photovoltaic system should be used as much as possible. The active and reactive power margins of power generation can further reduce the frequency and voltage deviation, that is, the droop coefficient near the normal operating point is required to be large...
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The invention provides a variable droop coefficient control method based on the operating characteristics and light intensity of photovoltaic power plants. This method is based on the active-frequency and reactive-voltage droop control of photovoltaic power generation, combined with the solar irradiance and the operating characteristics of photovoltaic power plants, and sets the active-frequency and reactive-voltage droop control settings according to the solar irradiance and photovoltaic power plants. The droop coefficient of operating characteristics changes, so that photovoltaic power generation can more fully participate in the frequency regulation and voltage regulation of the power system. The invention reduces the frequency and voltage deviation by increasing the droop coefficient of the active power-frequency characteristic curve and the reactive power-voltage characteristic curve near the operating point, thereby improving the stability of the power system; The large droop coefficient of photovoltaic power plants enables photovoltaic power plants with large margins to undertake more tasks in the process of frequency regulation and voltage regulation. Each photovoltaic power station can give full play to its frequency and voltage regulation capabilities, and improve the precision of coordinated control between photovoltaic power plants.
Description
technical field [0001] The present application relates to the field of photovoltaic power generation participating in frequency regulation and voltage regulation, and in particular to a variable droop coefficient control method based on the operating characteristics and light intensity of photovoltaic power plants. Background technique [0002] Photovoltaic power generation has developed rapidly in recent years due to the advantages of abundant reserves, high cost-effectiveness, cleanliness and environmental protection, and the grid-connected capacity has continued to increase. However, as a static component, the photovoltaic power generation system lacks the moment of inertia, and is generally in the maximum power tracking mode, and does not participate in the system frequency regulation; and the photovoltaic power generation is connected to the system through the inverter, which does not have the voltage support capability of the traditional synchronous machine, and does no...
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IPC IPC(8): H02J3/24H02J3/16
CPCH02J3/241H02J3/16H02J2203/20Y02E40/30
Inventor 吴鹏飞刘博杨鹏程宋胜利王庆刘钊汛秦亮刘开培
Owner GLOBAL ENERGY INTERCONNECTION RES INST CO LTD