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Photovoltaic converter network construction control method and device based on model predictive control

A model predictive control and control method technology, applied in photovoltaic power generation, AC network voltage adjustment, single-network parallel feeding arrangement, etc., can solve problems such as output power limitation, achieve the effect of stabilizing output voltage frequency and maintaining maximum power output

Active Publication Date: 2022-08-02
ZHEJIANG UNIV +1
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  • Application Information

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Problems solved by technology

However, for photovoltaic converters, the input DC voltage changes with the movement of the operating point of the photovoltaic panel, and its output power is also limited by the output of the photovoltaic panel. The grid control of converters is a research hotspot in the field of grid-connected control of new energy power generation.

Method used

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  • Photovoltaic converter network construction control method and device based on model predictive control
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  • Photovoltaic converter network construction control method and device based on model predictive control

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Embodiment Construction

[0047] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0048] like figure 1 As shown, the present invention provides a novel grid construction control method for photovoltaic converters based on model predictive control, comprising the following steps:

[0049] Step 1: As figure 2 As shown, based on the photovoltaic panel connected to the AC bus model through the photovoltaic converter, the input photovoltaic voltage Vpv ( k ), input photovoltaic current Ipv ( k ), the AC side outputs the three-phase voltage Vo abc ( k ), output three-phase current Io abc ( k ) and AC filter three-phase current If abc ( k ), and transform the three-phase quantity to the two-phase stationary αβ coordinate system to obtain Vo( k ), Io( k ) and If ( k ), and establish the photovoltaic converter prediction model in the αβ coordinate system:

[0050]

[0051] in,

[0052]

[0053] Among t...

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Abstract

The invention discloses a photovoltaic converter network construction control method and device based on model prediction control, and the method comprises the steps: collecting the photovoltaic input voltage and current of a DC side, the output voltage and current of an AC side, and the current of an AC filter at the current moment of a photovoltaic converter, and building a prediction model of the photovoltaic converter; calculating a photovoltaic predicted voltage and an AC predicted voltage at the next sampling moment; according to the photovoltaic output state and the current AC voltage amplitude, determining the operation mode of the photovoltaic converter and the AC voltage reference value at the next sampling moment; and finally, designing a cost function to track an output voltage reference value, and adding a penalty function into the cost function to abandon the switching state which does not meet the requirement. According to the invention, when the photovoltaic output of the photovoltaic converter is sufficient, the AC voltage is independently constructed, and the network construction control is realized; and when the photovoltaic output is insufficient and cannot meet the load demand, the photovoltaic converter adaptively adjusts the amplitude of the output voltage, stabilizes the frequency of the output voltage, and maintains the maximum photovoltaic power output.

Description

technical field [0001] The invention relates to the technical field of grid-connected control of new energy power generation, in particular to a method and device for grid-connected control of photovoltaic converters based on model prediction control. Background technique [0002] In recent years, with the continuous decline of the cost of photovoltaic panels and the maturity of photovoltaic power generation technology, photovoltaic is becoming one of the most promising renewable energy sources. However, most of the existing photovoltaic power generation adopts the grid-following control method, which requires a phase-locked loop to measure the phase information of the grid-connected point. There is a stability problem in the weak power grid, which restricts the improvement of the photovoltaic penetration rate. In the weak grid or even off-grid state, the converter should adopt the grid-type control, and actively establish the bus voltage to ensure the stable operation of th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38H02J3/48H02J3/50H02J3/24H02J3/16
CPCH02J3/381H02J3/48H02J3/50H02J3/241H02J3/16H02J3/004H02J2203/20H02J2300/26Y02E10/56
Inventor 杨鹏程夏杨红韦巍于淼彭勇刚蔡宏达李静
Owner ZHEJIANG UNIV
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