Delay-free single-phase photovoltaic synchronization power adjusting method

A photovoltaic and photovoltaic array 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, current distortion increase, grid frequency offset, etc.

Active Publication Date: 2013-11-06
HUNAN UNIV
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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 implementation manners of the present invention will be described in detail below in conjunction with 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 a photovoltaic array, a Boost circuit, a full-bridge inverter circuit (inverter), an LC filter, a local load, and a driver Protection circuit, and DSP control system. C dc It is the DC capacitor on the inverter side, which filters out the 100Hz ripple generated by the inverter and buffers the energy exchange. LC filter consists of an inductor L s and capacitance C s Composition, filter out the 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. Due to the low photovoltaic output voltage, the DC side voltage needs to be raised to about 400V through a Bo...

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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 fields 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, the distributed generation of photovoltaic roof (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 realize grid-connected power generation. In the case of sufficient light, the local load power is provided nearby, and the excess power is sent to the power grid; in the case of insufficient light, the local load directly consumes power from the power grid. [0003] Distributed photovoltaic grid-connected power generat...

Claims

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Application Information

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Patent Type & Authority Patents(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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