A method for controlling DC power transmission of grid-connected photovoltaic power sources
A photovoltaic power supply and power transmission technology, applied in the field of power transmission, can solve problems such as unseen reports, and achieve the effect of enhancing stability and improving the utilization rate of light energy.
Inactive Publication Date: 2016-06-22
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology
But so far, the precise control method of photovoltaic power output DC power that can follow the grid dispatching instructions has not been reported.
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[0024] figure 1 It is the schematic diagram of power transmission control of the grid-connected photovoltaic power generation system corresponding to the present invention. The photovoltaic power generation system mainly includes photovoltaic power supply, DC / DC power transmission control device, DC bus, DC / AC inverter, integrated controller and other parts. The DC / DC power transmission control device is composed of an input filter capacitor C1, an output filter capacitor C2, an energy storage inductor L, an IGBT module T, and an anti-reverse diode D.
[0025] When the system is running, the photovoltaic power supply is responsible for converting light energy into DC power; the DC / DC power transmission control device is responsible for transmitting the required DC power to the DC bus to control the operating status of the photovoltaic power supply; the DC bus is responsible for the accumulation and distribution of DC power; The DC / AC inverter is responsible for converting DC p...
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The invention relates to a grid connection photovoltaic power direct current electric energy transmission control method. The method includes the steps that a comprehensive controller of a photovoltaic power generation system calculates the duty ratio needed by controlling a target DC / DC electric energy transmission control device according to power grid dispatching information received in time and photovoltaic power practical output calculated by photovoltaic power operation information collected in real time, the operation state of the DC / DC electric energy transmission control device connected between a photovoltaic power source and a direct current bus is adjusted in real time according to the calculation result, the standby power capacity discreet value of the photovoltaic power source in the current operation state is calculated at the same time, and the current output state and the standby power capacity are fed back to a power grid dispatching system. By means of the grid connection photovoltaic power direct current electric energy transmission control method, the output of the photovoltaic power generation system can be flexibly adjusted according to a dispatching command, the light energy using rate of the photovoltaic power source can be further increased to the maximum degree, the stability of direct current bus voltage of the photovoltaic power generation system is improved, and a technology foundation is laid for stable operation of the whole photovoltaic power generation system.
Description
technical field [0001] The invention relates to a control method for transmitting DC power generated by a photovoltaic power source in a grid-connected photovoltaic power generation system to a DC bus according to a grid dispatching command, and belongs to the technical field of power transmission. Background technique [0002] When the grid-connected photovoltaic power generation system with a DC bus is running, the photovoltaic power source composed of photovoltaic cell components is used to convert light energy into DC electric energy. If the photovoltaic power supply is directly connected to the DC bus, the photovoltaic power will be input to the AC grid by the inverter through the DC bus; busbar, and then enter the AC grid through the inverter. The inverter is connected between the DC bus and the AC grid, and is responsible for converting DC power into AC power and transmitting it to the AC grid. If an MPPT device is installed between the photovoltaic power supply and...
Claims
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IPC IPC(8): H02J3/46H02S40/30H02M3/156
CPCY02E10/56
Inventor 张建成丁晓哲
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)