Active pre-reaction control system and algorithm for maximum photovoltaic power point tracking
A maximum power point, active technology, applied in control/regulation systems, photovoltaic modules, photovoltaic power generation, etc., can solve problems such as entering the dead zone, control failure, and inability to predict shadows and occlusions in time, and achieve the effect of increasing production capacity
Pending Publication Date: 2018-06-01
YANGZHOU HUADING ELECTRIC APPLIANCE
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Problems solved by technology
[0003] In the actual operation process, due to the change of weather and surrounding temperature, the illumination and shadow of the photovoltaic array change greatly. The traditional reactive control method cannot predict the shadow and shading situation in time. The switch capacitor converter needs to respond quickly, and the The traditional converter control algorithm is based on a single switch output duty cycle. In some cases, it will enter the dead zone and cannot return autonomously, resulting in control failure. Therefore, it is impossible to achieve the optimal MPPT control around the clock
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[0033] The present invention will be further described below in conjunction with specific embodiments.
[0034] The present invention is aimed at the MPPT control in the photovoltaic power generation system. The structural block diagram of the traditional photovoltaic module MPPT control system is as follows: Figure 5 As shown, the power generation circuit has multiple photovoltaic modules connected in series to supply DC power to the inverter. When the sunlight situation changes, the load curve that can provide the maximum power transmission efficiency also changes. The MPPT controller is designed to match the power transmission efficiency. Adjust the load so that the system always maintains the best efficiency, and then convert the voltage, current or frequency to match other systems. However, because the traditional control mode is a reactive control, sometimes the sunshine changes rapidly, such as cloud cover, temperature changes, etc., while the reactive control control ...
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The invention discloses an active pre-reaction control system for maximum photovoltaic power point tracking and belongs to the field of photovoltaic power generation. The active pre-reaction control system comprises a direct-current transformer connected between a photovoltaic module and a filter; the front end of the filter is connected with the direct-current transformer while the rear end of the filter is connected with an inverter; the direct-current transformer refers to a switched capacitor direct-current transformer which is further connected with an active pre-reaction controller; theactive pre-reaction controller is further connected with an information receiving and storing device. According to the system, influence from environmental change to the control system can be predicted according to all known information and forecast information, the optimum control instruction for the next time slot is optimized according to historical and current data, system circuit models and optimization algorithms, and thus, photovoltaic power generation capacity is improved to the utmost extent. The control system is applied to photovoltaic power generation.
Description
technical field [0001] The invention relates to a photovoltaic power generation control system, in particular to a photovoltaic maximum power point control system. Background technique [0002] Today, the rapid development of distributed photovoltaic power generation systems has put forward higher requirements for photovoltaic power generation control technology. Due to the advantages of small size and low magnetization, DC-DC converters based on switched capacitors have great application prospects in photovoltaic power generation systems. , usually used for maximum power point tracking (MPPT) control on the output side of the photovoltaic array. [0003] In the actual operation process, due to the change of weather and surrounding temperature, the illumination and shadow of the photovoltaic array change greatly. The traditional reactive control method cannot predict the shadow and shading situation in time. The switch capacitor converter needs to respond quickly, and the T...
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IPC IPC(8): G05F1/67H02S40/30H02S40/32
CPCH02S40/30H02S40/32G05F1/67Y02A30/00Y02E10/56
Inventor 蔡长虹纪昆江启芬戴永林
Owner YANGZHOU HUADING ELECTRIC APPLIANCE