A unified power control method for direct-to-direct conversion circuits suitable for photovoltaic microgrid systems
A conversion circuit and power control technology, applied in battery circuit devices, photovoltaic modules, circuit devices, etc., can solve the problems of uncontrollable output power, reducing the utilization rate of new energy, and unfavorable smooth and stable operation of the system, so as to ensure continuous and stable operation. , the effect of maintaining power balance
Active Publication Date: 2016-11-30
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS +1
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Problems solved by technology
If existing distributed power sources such as photovoltaic inverters are used, since they can only operate in MPPT mode, the output power cannot be controlled
Coupled with the randomness of the power load, the system cannot manage the charging and discharging of the energy storage device when the off-grid mode is running.
In addition, when the output power of the distributed power supply is too large, that is, when the limit of the energy storage device is exceeded, the system needs to forcibly cut off the operation of photovoltaics, which is not conducive to the smooth and stable operation of the system, and also reduces the utilization rate of new energy to a certain extent.
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[0024] The present invention will be further explained below in conjunction with the accompanying drawings.
[0025] attached figure 2 It is the basic structural block diagram of the MPPT and power-limiting unified control method. The system detects the current operating state of the system. When the photovoltaic microgrid operates in grid-connected mode, the photovoltaic array is controlled by controlling the Boost direct-to-direct conversion circuit to make it operate in MPPT mode. , the maximum output power of the photovoltaic array; when the photovoltaic microgrid operates in off-grid mode, the system detects the working status of the energy storage device in real time, and if the energy storage device operates within the normal range, the photovoltaic array is controlled to operate in MPPT mode, and the output of the photovoltaic array is maximum Power; if the capacity of the energy storage device is close to saturation or exceeds the maximum charging current, it will op...
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A unified power control method for direct-to-direct conversion circuits suitable for photovoltaic micro-grid systems, including two functions of MPPT and power-limiting control, which can ensure the stable operation and power output optimization of the system in and out of the grid, and in off-grid conditions Possess certain energy storage management capabilities. The proposed unified power control method is based on disturbance observation, and the power-limiting control function differs in the realization of the control method according to whether the energy storage device is full capacity or exceeds the limited current. In order to improve the rapidity of the power-limiting control method, a variable step size disturbance observation method is further introduced, taking into account both steady-state and dynamic performance. The photovoltaic micro-grid unified power control method described in the present invention can organically combine MPPT and power-limiting control, is simple to implement, can further expand the operation of the photovoltaic micro-grid system, is conducive to improving the utilization efficiency of renewable energy power generation, and has a good Application value and promotion prospect.
Description
technical field [0001] The invention relates to a unified power control method for a direct-to-direct conversion circuit in a photovoltaic microgrid system, which belongs to the microgrid system control technology in the field of new energy power generation and electric energy conversion. Background technique [0002] With the continuous and rapid development of social economy, my country's energy development is facing problems such as the widening gap between energy supply and demand, insufficient oil reserve resources, and serious environmental pollution. In order to achieve the sustainable development of energy, social economy and environment, the development and utilization of solar energy and other renewable energy distributed power generation technology is one of the important ways to solve the energy crisis. However, the direct connection of photovoltaic inverters has disadvantages such as high cost, relatively difficult control, and impact on the power grid. For thi...
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IPC IPC(8): H02J3/38H02J7/00H02S40/38
Inventor陈杰陈家伟陈新龚春英薛济萍薛群山冯志阳
OwnerNANJING UNIV OF AERONAUTICS & ASTRONAUTICS