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Delay-free single-phase photovoltaic synchronization power adjusting method

A power regulation, photovoltaic technology, applied in reactive power adjustment/elimination/compensation, photovoltaic power generation, reactive power compensation and other directions, which can solve problems such as voltage fluctuation, grid frequency offset, delay, etc.

Active Publication Date: 2012-07-25
HUNAN UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0007] The technical problem to be solved by the present invention is to provide a single-phase photovoltaic grid-connected power adjustment method without delay to overcome the shortcomings of the existing single-phase photovoltaic power adjustment method and solve the problem of single-phase reactive power detection. The problem of increased current distortion caused by time delay, grid frequency deviation and voltage fluctuation

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  • Delay-free single-phase photovoltaic synchronization power adjusting method
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  • Delay-free single-phase photovoltaic synchronization power adjusting method

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Embodiment Construction

[0036] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0037] figure 1 Shown is a schematic diagram of a single-phase grid-connected photovoltaic power generation and reactive power compensation system without a transformer structure, which mainly includes photovoltaic arrays, Boost circuit, full-bridge inverter circuit (inverter), LC filter, local load, and drive Protection circuit and DSP control system. C dc It is the inverter side DC capacitor, which filters out the 100Hz ripple generated by the inverter and buffers the energy exchange. LC filter consists of inductor L s And capacitance C s Composition, filter out high frequency harmonics on the AC side of the inverter; u s Is the grid voltage, i g Is the current injected into the grid. Because the photovoltaic output voltage is low, the DC side voltage needs to be raised to about 400V through the Boost boost circuit, L b In order to boost th...

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Abstract

The invention discloses a delay-free single-phase photovoltaic synchronization power adjusting method, which mainly includes delay-free ip-iq reactive current detection of a single-phase load, external peripheral voltage PI (potential intensity) control, power feedforward, current internal peripheral quasi-resonance PR (potential resistance) control and grid voltage feedforward. The method is used for enabling a single-phase photovoltaic synchronized generation system distributed at the grid end to quickly provide reactive electric energy required by the load while providing active electric energy for the grid and a local load, so that stability of grid voltage is realized and power supply quality is improved. The method enables the distributive single-phase photovoltaic synchronized generation system to realize precision adjustment of synchronization power while stability, reliability and interference resistance of the system are improved, and accordingly the requirements of single-phase photovoltaic synchronization are better met.

Description

Technical field [0001] The invention relates to the field of distributed power generation and solar photovoltaic roof power generation, in particular to a single-phase photovoltaic grid-connected power adjustment method without delay. Background technique [0002] Solar photovoltaic grid-connected power generation technology has become one of the ways to alleviate the energy crisis. In order to meet the needs of small users, distributed generation of photovoltaic rooftops (BIPV) connected to the low-voltage distribution network has received more and more attention. The BIPV photovoltaic power generation system is connected to the grid through an inverter to achieve grid-connected power generation. In the case of sufficient light, the nearby local load power is provided and the excess power is sent to the grid; in the case of insufficient light, the local load consumes power directly from the grid. [0003] Distributed photovoltaic grid-connected power generation systems are widel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38H02J3/01H02J3/18
CPCY02E10/563Y02E40/30Y02E10/56Y02E40/40
Inventor 罗安陈燕东谢三军周洁张庆海彭自强周乐明
Owner HUNAN UNIV
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