A power control method for integrated photovoltaic modules with tilt characteristic protection
An integrated photovoltaic and power control technology, applied in the direction of photovoltaic power generation, photovoltaic modules, electrical components, etc., can solve the problems of upper computer misjudgment, wrong scheduling, and large inverter pre-charging circuit, etc., to achieve stable power and convenient use Effect
Active Publication Date: 2018-03-27
YANGZHOU UNIV
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Problems solved by technology
This change is transmitted to the upper computer through the communication network, which may cause the upper computer to misjudge and perform wrong scheduling; when the traditional distributed photovoltaic system is started, the high-power inverter will first pre-charge the DC bus capacitor to the starting voltage , the inverter pre-charging circuit is large in size, or the capacitor pre-charging is performed by the front-end DC / DC. When some components cannot be started due to complete shading, the inverter will not be able to start, and the energy conversion efficiency is low. At the same time, the DC side of the inverter The design of the working voltage is also of great significance to the influence of the power output of the photovoltaic panel
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[0041] The present invention will be further described below in conjunction with specific embodiments.
[0042] like Figure 1-2 The integrated photovoltaic module system shown can be divided into parallel type and series type according to the topology, such as figure 1 As shown in , PV in the figure is a photovoltaic panel, DC-DC is a DC / DC converter, and PV and DC-DC form an integrated photovoltaic module; when the series-parallel system is running, the DC / DC controller in the integrated photovoltaic module is in the When carrying out voltage limiting or current limiting protection control, the relationship curve between the output terminal voltage and current is set as a steep or gentle slope straight line, such as Figure 3-4 As shown in , there are four U-I and I-U curves under different illuminance in the figure, and X in the figure min and x max Respectively, the intersection points of the maximum power curve and the inclined pressure-limiting / current-limiting curve,...
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The invention discloses a power control method for an integrated photovoltaic module with tilt characteristic protection in the field of photovoltaic power generation. The integrated photovoltaic module includes a plurality of photovoltaic power generation groups with the same structure, and each photovoltaic power generation group includes a photovoltaic battery board and a DC / DC converter, the energy collected by the photovoltaic panel is sent through the DC / DC converter, and the power control method includes the following steps: Step 1) The DC / DC converter receives the energy from the photovoltaic power generation group, and uses the nonlinear MPPT algorithm to control the photovoltaic module Realize maximum power output; Step 2) Limit the voltage and current limit protection of the energy output by the photovoltaic panel through the DC / DC converter. The straight line and the maximum power curve cooperate with each other to realize the safe energy output of the photovoltaic battery panel. The invention improves the stability of the photovoltaic power generation assembly and can be used in solar power generation.
Description
technical field [0001] The invention relates to a method for controlling a photovoltaic module, in particular to a method for controlling the power of a photovoltaic module. Background technique [0002] In a distributed photovoltaic system, in addition to the MPPT function, the DC / DC controller generally has voltage limiting and current limiting protection functions to prevent devices from being damaged by overvoltage or overcurrent. Voltage limiting and current limiting control are generally related to external factors such as the direction of sunlight, area intensity, and shadows. Therefore, under extremely harsh conditions, all components in the photovoltaic module system will all work under the protection algorithm, and the MPPT algorithm will all fail. The output Not only will the power drop significantly, but the output power of a single component will also become uncontrollable and the system stability will deteriorate. Under the action of a brief interference signa...
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IPC IPC(8): H02S40/30H02S40/32H02J13/00
CPCH02J13/0006H02S40/30H02S40/32Y02E10/50
Inventor 史旺旺蔡晓宇杨俊伟
Owner YANGZHOU UNIV