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A photovoltaic boost converter double closed-loop control method for a photovoltaic energy storage system

A double-closed-loop control and photovoltaic energy storage technology, applied in photovoltaic power generation, control/regulation systems, output power conversion devices, etc., can solve the problem of inability to obtain stable DC bus voltage, unfavorable photovoltaic energy storage system stability control, and increase algorithm Control complexity and other issues to achieve the effect of reducing control complexity, improving steady-state accuracy and anti-disturbance performance, and improving output voltage waveform

Active Publication Date: 2016-08-17
来宾市计量测试研究所
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  • Application Information

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Problems solved by technology

Among them, the MPPT control strategy of the Boost converter on the photovoltaic side cannot obtain a stable DC bus voltage, which is not conducive to the stable control of the entire photovoltaic energy storage system, and also increases the algorithmic control complexity of the entire system

Method used

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  • A photovoltaic boost converter double closed-loop control method for a photovoltaic energy storage system
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  • A photovoltaic boost converter double closed-loop control method for a photovoltaic energy storage system

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Embodiment Construction

[0019] see figure 1 It can be seen that a photovoltaic energy storage system includes photovoltaic modules, lithium-ion batteries, public power grids, local loads, and power converters, where the power converters include photovoltaic-side Boost converters, battery-side Buck-Boost converters, and load-side full-bridge inverters. Inverter, the lithium-ion battery is connected to the load-side full-bridge inverter through the battery-side Buck-Boost converter, the photovoltaic module is connected to the load-side full-bridge inverter through the photovoltaic-side Boost converter, and the converter is connected to the load-side full-bridge inverter The inverter is connected to the local load, and the above three converters are connected across the common DC bus to form a DC microgrid.

[0020] see figure 2 It can be seen that when the system is in the constant current power supply state (CV-Constant Voltage) mode, the DC bus voltage is controlled to be constant, and its control ...

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Abstract

The invention discloses a double closed loop control method for a photovoltaic Boost convertor of a photovoltaic energy storage system. When the photovoltaic Boost convertor is in the working state of constant current power supply, the output end of the photovoltaic Boost convertor collects a current signal and a voltage signal and feeds the signals back to a current loop PI adjuster of the photovoltaic Boost convertor. According to the control method, an outer ring is a Boost circuit output voltage ring, so that wave form of output voltage is changed, and stability precision and anti-interference performance are improved; an inner ring is a Boost circuit inductive current ring, so that the dynamic property of the system is improved. By means of the whole control method, stable direct current bus voltage can be obtained. Compared with an MPPT control strategy of an existing photovoltaic side Boost convertor, the whole photovoltaic energy storage system can be stably controlled, and control complexity of the whole system is reduced at the same time.

Description

technical field [0001] The invention relates to the field of photovoltaic energy storage, in particular to a double closed-loop control strategy of a photovoltaic side BOOST converter in a photovoltaic energy storage system. Background technique [0002] In traditional photovoltaic systems, the control strategy of photovoltaic Boost converters mostly adopts the Maximum Power Point Tracking (MPPT) mode, which can obtain the maximum power generation efficiency and the optimal benefit. [0003] The power converter in the photovoltaic energy storage system includes a photovoltaic side Boost converter, a battery side Buck-Boost converter and a load side full-bridge inverter. All three converters are connected across the common DC bus to form a DC microgrid. Among them, the MPPT control strategy of the Boost converter on the photovoltaic side cannot obtain a stable DC bus voltage, which is not conducive to the stable control of the entire photovoltaic energy storage system, and a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/38H02M3/155
CPCY02E10/56
Inventor 蔡旭姜广宇李睿王海松叶程广郑琴
Owner 来宾市计量测试研究所
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