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Grid-connected generation control method for photovoltaic power generation converter

A technology of photovoltaic power generation and control method, which is applied in the direction of photovoltaic power generation, climate change adaptation, single-network parallel feeding arrangement, etc. It can solve the problems of slow current dynamic response, serious current distortion, and high sensitivity of system parameters, and achieve voltage stability, The effect of stable grid-connected operation

Inactive Publication Date: 2012-04-11
HARBIN JIUZHOU ELECTRIC TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Other converter controllers have disadvantages and deficiencies such as simple structure, usually no feedback channel, high sensitivity of system parameters, slow current dynamic response, serious current distortion, etc.

Method used

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  • Grid-connected generation control method for photovoltaic power generation converter
  • Grid-connected generation control method for photovoltaic power generation converter
  • Grid-connected generation control method for photovoltaic power generation converter

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Example 1: Combining Figure 2-Figure 6 , the grid-connected power generation control method of the photovoltaic power generation converter of the present invention, which includes grid voltage software phase-locking, voltage outer loop establishment, current control and grid voltage directional vector control, and the grid voltage software phase-locking adopts software three-phase locking In the method of phase loop, the phase-locked loop is composed of a phase detector, a loop filter and an oscillator. First, the three-phase voltage is converted to the d-q coordinate system through coordinate transformation. In order to make the d-axis component and the voltage vector completely in phase, set The q-axis voltage reference value vq_ref=0, the q-axis voltage deviation value vq_err is used as the angle deviation output by the phase detector; the frequency is obtained through the output of the PI regulator, and then the angle value is obtained through an integral link. When...

Embodiment 2

[0037] Example 2: Combining Figure 1-Figure 6 According to the working characteristics of solar power generation, the present invention proposes a photovoltaic power generation converter grid-connected control strategy, and introduces the grid-connected control principle and design method in detail (the general control strategy block diagram is shown in image 3 shown).

[0038] 1. Mathematical model of single-stage three-phase photovoltaic inverter

[0039] Such as figure 1 shown in the figure , Respectively, the grid voltage and current of each phase; L and C are the filter inductance and capacitance respectively; R is the equivalent resistance including inductance resistance and switching loss resistance; C is the DC bus capacitance; is the DC bus voltage.

[0040] Define switch logic function (in )for:

[0041]

[0042] The mathematical model described by the VSR switch function in the three-phase coordinate system is as follows:

[0043]

[0044] dq...

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Abstract

The invention provides a grid-connected generation control method for a photovoltaic power generation converter. The method comprises the following steps of: grid voltage software phase lock, voltage outer loop establishment, current control and grid voltage orientated vector control, wherein the grid voltage software phase lock adopts a software three-phase phase-locked loop method; a phase-locked loop consists of a phase detector, a loop filter and an oscillator; the grid voltage orientated vector control adopts a double-closed-loop cascade control structure, namely a voltage outer loop and a current inner loop; the voltage loop controls a direct-current bus voltage; and the current loop controls an alternating-current side input current. By the method, the orientation is accurate, the direct-current bus voltage is controlled to be stable, and maximum power point tracking control is realized. Deadbeat control design is performed aiming at the current loop, so that the current loop controls the alternating-current side input current according to a current command given by the voltage loop and unit power factor operation is realized. By adopting a feedforward decoupling control method, stable grid-connected operation can be realized.

Description

(1) Technical field [0001] The invention relates to a photovoltaic power generation converter control technology, in particular to a grid-connected power generation control method for a photovoltaic power generation converter. (2) Background technology [0002] With the continuous depletion of conventional energy sources and serious environmental pollution, as a renewable and pollution-free solar energy, it has attracted much attention. The photovoltaic power generation converter is the core component of the solar power generation system, and its performance is directly related to the efficient, stable and safe use of solar energy. The control strategy of photovoltaic power generation converter is the key to its performance. [0003] At present, the existing technology of this type of converter is difficult to achieve accurate orientation and effective control of DC bus voltage stability, and the closed-loop control strategy to achieve maximum power point tracking control c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38
CPCY02E10/563Y02A30/60Y02E10/56
Inventor 周家琪周维来张哲裴景斌郑文英何建华
Owner HARBIN JIUZHOU ELECTRIC TECHNOLOGY CO LTD
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