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Parallel structure and control method for photovoltaic power generation grid-connected inverter

A photovoltaic power generation and inverter technology, which is applied in photovoltaic power generation, electrical components, and single-grid parallel feeding arrangements, etc., can solve problems such as the collapse of group control systems, and achieve the advantages of avoiding circulating current, simplifying control structure, and solving current sharing problems. Effect

Active Publication Date: 2011-09-14
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology

If each inverter performs voltage regulation control "individually", the group control system is bound to collapse

Method used

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  • Parallel structure and control method for photovoltaic power generation grid-connected inverter
  • Parallel structure and control method for photovoltaic power generation grid-connected inverter
  • Parallel structure and control method for photovoltaic power generation grid-connected inverter

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Embodiment Construction

[0019] The invention proposes a parallel structure of photovoltaic power generation grid-connected inverters and a control method thereof. The present invention will be described below in conjunction with the accompanying drawings.

[0020] figure 1 Shown is a schematic diagram of the main circuit topology of a typical voltage-type PWM inverter. In the figure, the electrical topology of the main circuit is divided into single-phase voltage-type PWM inverters in parallel and three-phase voltage-type PWM inverters in parallel. Phase voltage type PWM inverter topology circuit such as figure 1 (a) shown. The first power switch V 1 and the first antiparallel diode VD 1 Constitute the first upper arm, the second power switch tube V 2 and a second antiparallel diode VD 2 Constitute the first lower arm, the third power switch tube V 3 and the third antiparallel diode VD 3 Constitute the second upper arm, the fourth power switch tube V 4 and the fourth antiparallel diode VD 4...

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Abstract

The invention discloses a parallel structure and a control method for a photovoltaic power generation grid-connected inverter and belongs to the technical field of renewable energy sources. A topological circuit structure of the photovoltaic power generation grid-connected inverter is divided into a parallel structure of single-phase voltage type pulse-width modulation (PWM) inverters and a parallel structure of three-phase voltage type PWM inverters; and in the control method, an outer ring regulator of a control circuit of the parallel voltage type PWM inverters is independent based on a power grid voltage-oriented vector control technology in a control mode of voltage outer ring and current inner ring so as to form a common unified outer ring regulator; control strategies of various inverters are simplified into single closed loop current control so as to achieve the consistency of energy flow directions of the parallel voltage type PWM inverters and avoid ring current; and the parallel current sharing of the voltage type PWM inverters is realized. Therefore, multiple modules of the voltage type PWM inverters are connected in parallel to realize high-power modularized large-scale application.

Description

technical field [0001] The invention belongs to the technical field of renewable energy, and in particular relates to a parallel structure of a grid-connected inverter for photovoltaic power generation and a control method thereof. Background technique [0002] The core of the photovoltaic grid-connected power generation system is the grid-connected inverter, and the photovoltaic grid-connected system can be divided into two types: industrial frequency and high frequency. The power frequency grid-connected inverter first converts the DC power output by the photovoltaic cell into AC power through a DC / AC converter, and then connects to the power grid through a power frequency transformer to complete voltage matching and isolation from the power grid to realize grid-connected power generation. The power frequency grid-connected inverter has the disadvantages of large size, low efficiency and high cost due to the power frequency transformer. [0003] The high-frequency grid-co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/5387H02J3/38H02J3/46
CPCY02E10/563Y02E10/56
Inventor 颜湘武张波董清张珍
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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