Active power output control system and method of photovoltaic power station
A photovoltaic power station, active power output technology, applied in photovoltaic power generation, collectors, electric vehicles, etc., can solve the problems of unstable photovoltaic power supply, over-compliance operation, full load of photovoltaic power plants, etc., to meet the requirements of power supply time and prevent overload. The effect of running and maintaining the efficiency value
Inactive Publication Date: 2018-09-04
冯辉
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Problems solved by technology
Some use energy storage devices to suppress the impact of photovoltaic system active output fluctuations on grid voltage stability, but additional energy storage devices and complex control technologies are required
[0003] Due to the instability and randomness of photovoltaic power supply over time, the stability of the active power output of photovoltaic power plants cannot be effectively guaranteed, resulting in the inability of photovoltaic power plants to self-adaptively meet the needs of the load, especially when the load needs to provide high-power power for a period of time , it is easy to cause the photovoltaic power station to run at full load or exceed compliance, which seriously affects the safety and service life of the photovoltaic power station
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[0051]The application will be described in further detail below in conjunction with the accompanying drawings. It is necessary to point out that the following specific embodiments are only used to further illustrate the application, and cannot be interpreted as limiting the protection scope of the application. The above application content makes some non-essential improvements and adjustments to this application.
[0052] like figure 1 Shown is a schematic diagram of the method for controlling the active power output of a photovoltaic power plant in this application, including the following steps:
[0053] 1) Calculate the active power sensitivity and the sum of sensitivities at the grid-connected points of each photovoltaic power generation unit inside the photovoltaic system;
[0054] 2) Determine the P(U) strategy algorithm according to the sensitivity, obtain the grid-connected point voltage U and output the load demand power P* of the photovoltaic power station through t...
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The invention discloses an active power output control system and method of a photovoltaic power station. The active power output control method comprises the following steps of 1) calculating activepower sensitivity and sensitivity sum of a grid-connected point of each photovoltaic power generation unit in a photovoltaic system; 2) determining a P(U) strategy algorithm according to the sensitivity, acquiring a voltage U of the grid-connected point, and outputting a load demand power P<*> of the photovoltaic power station according to the P(U) strategy algorithm; 3) processing the load demandpower P<*> of the photovoltaic power station and the photovoltaic power generation unit P<pvmax> by a subtractor to determine whether an output active power is input by an electric energy storage device or not; 4) determining time of different electric energy storage devices input to the system according to time of load demand power; and 5) controlling the photovoltaic power station to output anactive power according to the determined numbers of the photovoltaic power generation units input by the photovoltaic power station and the time of the electric energy storage devices input to the system. By the active power output control method, the output of the photovoltaic power station can be safely and efficiently controlled.
Description
technical field [0001] The application belongs to the technical field of new energy power supply, and in particular relates to a photovoltaic power station active power output control system and method. Background technique [0002] In recent years, with the continuous reduction of photovoltaic system costs and the maturity of photovoltaic grid-connected technology, large-scale photovoltaic power generation has become more and more favored by the international community. Large-scale photovoltaic power plants are generally built in remote areas with abundant solar energy resources. Compared with small and medium-sized photovoltaic systems, solar energy can be used more intensively, and parallel inverters can be controlled and managed. However, as the proportion of photovoltaic power generation in the power grid continues to increase, photovoltaic power needs to be transmitted to the load center over long distances, and the photovoltaic system has an adverse effect on the grid...
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IPC IPC(8): H02J3/48H02J3/38H02J7/34
CPCH02J3/383H02J3/48H02J7/345H02J2203/20Y02E10/56
Inventor 冯辉冯晨皓郭芳
Owner 冯辉