Grid-connected current control method for combined single-phase two-stage photovoltaic generation system

A photovoltaic power generation system and current control technology, applied in photovoltaic power generation, single-network parallel feeding arrangement, AC network to reduce harmonics/ripples, etc., can solve problems such as poor dynamic response and increased output voltage error, and achieve Sensitive dynamic response, reduced impact, and improved anti-interference ability

Inactive Publication Date: 2013-05-22
SOUTHEAST UNIV
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Problems solved by technology

Repetitive control technology has a simple control algorithm, and only needs to sample the output voltage, so that the inverter can obtain a steady-state output waveform with lower THD under periodic disturbances, and the steady-state performance is excellent; however, due to the existence of In the fundamental cycle delay link, the

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  • Grid-connected current control method for combined single-phase two-stage photovoltaic generation system
  • Grid-connected current control method for combined single-phase two-stage photovoltaic generation system
  • Grid-connected current control method for combined single-phase two-stage photovoltaic generation system

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Embodiment Construction

[0023] The present invention will be further described below in conjunction with the accompanying drawings.

[0024] A combined single-phase two-stage photovoltaic power generation system grid-connected current control method, such as figure 1 As shown, the single-phase photovoltaic power generation system is a two-stage structure, including the BOOST step-up circuit link of the front stage and the single-phase full-bridge inverter circuit link of the rear stage; the single-phase full-bridge inverter circuit link adopts two Closed-loop control strategy, the outer loop is the DC bus voltage loop, the inner loop is the grid-connected current loop, and the grid voltage feed-forward control is adopted; the BOOST step-up circuit realizes raising the voltage of the photovoltaic battery module to the DC bus voltage reference value, and at the same time Realize maximum power point tracking; the single-phase full-bridge inverter circuit link realizes the stability of the DC bus voltage...

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Abstract

The invention discloses a grid-connected current control method for a combined single-phase two-stage photovoltaic generation system. The single-phase photovoltaic generation system is of a two-stage structure and comprises a first-stage BOOST up circuit link and a second-stage single-phase full-bridge inverter circuit link. The single-phase full-bridge inverter circuit link adopts a double-closed-loop control strategy and comprises an outer loop which is a direct-current bus voltage loop and an inner loop which is a grid-connected current loop and further utilizes voltage forward feed control of a power grid. The BOOST up circuit link is used for realizing boosting voltage of a photovoltaic battery module to a direct-current bus voltage reference value while realizing maximum power point tracking. Besides, the single-phase full-bridge inverter circuit link is used for realizing stabilization of the direct-current bus voltage and synchronization of frequency and phase of system output current and voltage of the power grid. The grid-connected current control method for the combined single-phase two-stage photovoltaic generation system has the advantages of excellent stability, flexibility in dynamic response, low content of low-order harmonics, high interference resistance, good robustness, high reliability and the like.

Description

technical field [0001] The invention relates to a control technology of grid-connected current in a single-phase two-stage photovoltaic power generation system, belonging to the field of photovoltaic power generation control. Background technique [0002] In today's society, the increasing shortage of non-renewable energy and the increasing environmental pollution have made the use of renewable energy such as solar energy a strong concern of the government and all walks of life, and photovoltaic power generation technology has also developed rapidly. Grid-connected current control technology is one of the main technologies involved in photovoltaic power generation. [0003] Currently commonly used current control technologies include: PI control, hysteresis control, deadbeat control, proportional resonance (Proportional resonant, referred to as PR) control, repetitive (Repetitive control, referred to as RC) control and harmonic compensation (Harmonic compensation, referred t...

Claims

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Application Information

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IPC IPC(8): H02J3/38H02J3/01
CPCY02E10/563Y02A30/60Y02E10/56Y02E40/40
Inventor 林明耀吴威林克曼
Owner SOUTHEAST UNIV
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