A control method for off-grid energy balance of microgrid based on frequency shift control
A technology of energy balance and control method, applied in the direction of AC network load balancing, etc., can solve the problems of complex technical communication, achieve the effect of realizing energy balance, improving control stability, reducing construction cost and debugging period
Active Publication Date: 2018-06-26
XUJI GRP +2
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[0005] The purpose of the present invention is to provide a microgrid off-grid energy balance control method based on frequency shift control to solve the problem of complex communication in the prior art
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[0021] The present invention will be described in further detail below in conjunction with the accompanying drawings.
[0022] Microgrid systems such as figure 1 As shown, it includes distributed power supply, battery and load. The distributed power supply is connected to the AC bus of the microgrid through the inverter (the photovoltaic inverter shown in the figure), and the battery is connected to the AC bus through the energy storage converter. The AC bus is connected to the distribution network through a switch at the common connection point PCC.
[0023] Under normal circumstances, the microgrid is connected to the distribution network through the PCC point and runs in parallel with the distribution network, and exchanges power with the distribution network; It enters the off-grid operation mode, and the micro-power supply supplies power to the loads in the micro-grid.
[0024] When running off-grid, the battery (or energy storage battery) stores energy as the main cont...
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The invention relates to a frequency shift control-based micro grid off-grid energy balance control method. An energy storage converter detects SOC or terminal voltage of a battery in real time, a frequency adjustment coefficient is adaptively changed according to the magnitude of the SOC or terminal voltage of the battery, and according to a formula f=fn+kiP+Ci, an output frequency is changed; according to the size of a system frequency, a distributed power inverter is matched with an MPPT control mode for adjusting self output. The method of the invention does not depend on communication and an integrated control manager, the problem of depending on communication in the prior art is thus solved, and control stability is improved greatly. Through frequency shift adjustment control of the energy storage converter, the distributed power inverter is matched with an MPPT tracking module for adjusting self output automatically according to the size of the system frequency of the micro grid, active power fluctuation in the case of micro grid off-grid operation is stabilized, and micro grid off-grid energy balance is realized; and the construction cost and the debugging cycle of the micro grid can be effectively reduced.
Description
technical field [0001] The invention relates to a microgrid off-grid energy balance control method based on frequency shift control. Background technique [0002] With the increasingly prominent energy crisis and the pressure of energy conservation and environmental protection, renewable energy power generation has become a development trend, and distributed power generation is an important form of renewable energy power generation. However, distributed power generation is an uncontrollable source compared to the power grid. In order to reduce its impact and negative impact on the power grid, the power grid often adopts a limited and isolated approach to deal with distributed power. The IEEE1547 standard makes the following regulations on the access of distributed power generation: when the main power grid fails, the distributed power generation unit must be out of operation immediately. This greatly restricts distributed generation from fully exerting its effectiveness. M...
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IPC IPC(8): H02J3/32
Inventor 李瑞生谢卫华李献伟毋炳鑫吕振宁王毅刘德贵
Owner XUJI GRP