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Unified controller and control method of single-stage Z-source photovoltaic grid-connected inverter

A single-stage inverter technology, applied in photovoltaic power generation, single-network parallel feed arrangement, climate change adaptation, etc., can solve problems such as low efficiency and unrealized system unified control method, and achieve harmonic reduction and energy saving Cost, the effect of compact system structure

Active Publication Date: 2015-09-30
STATE GRID CORP OF CHINA +3
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Problems solved by technology

However, the efficiency of the traditional two-stage or single-stage photovoltaic power generation system is lower than that of the Z-source inverter, and the high-efficiency Z-source inverter cannot be combined with the reactive power compensation function, and a unified control method for the whole system has not been realized.

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  • Unified controller and control method of single-stage Z-source photovoltaic grid-connected inverter
  • Unified controller and control method of single-stage Z-source photovoltaic grid-connected inverter
  • Unified controller and control method of single-stage Z-source photovoltaic grid-connected inverter

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[0024] The technical scheme of the present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments, so that those skilled in the art can better understand the present invention and implement it, but the examples given are not intended to limit the present invention.

[0025] A unified controller for a single-stage Z-source photovoltaic grid-connected inverter, such as figure 1 As shown, it includes a photovoltaic voltage sampling module 201 and a photovoltaic current sampling module 202 connected to the solar photovoltaic array 101, a capacitor voltage sampling module 203 connected to the Z source network 102, a grid voltage sampling module 204 connected to the three-phase power grid and a grid A current sampling module 205 .

[0026] The photovoltaic current sampling module 202 is sequentially connected with the MPPT module 207, the first subtractor, the photovoltaic voltage PI controller 206, and the SVPWM mo...

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Abstract

The invention discloses a unified controller and control method of a single-stage Z-source photovoltaic grid-connected inverter. A single-stage photovoltaic grid-connected system based on a Z-source inverter utilizes a Z-source network and inverter direct connection time to realize boosting; furthermore, grid-connected current inversion control can be realized; the unified controller is integrated with harmonic and reactive compensation, and is compact in overall structure, relatively high in efficiency and relatively reliable in operation.

Description

technical field [0001] The invention relates to a unified controller and control method of a single-stage Z-source photovoltaic grid-connected inverter, in particular to a unified single-stage Z-source photovoltaic grid-connected inverter with harmonic and reactive power compensation Controller and control method. Background technique [0002] Since changes in the external environment have a greater impact on the distributed photovoltaic power generation system, its output power is directly affected by the current ambient solar radiation and temperature. In order to maximize the output power of grid-connected photovoltaic systems, two-stage grid-connected photovoltaic systems are widely used. Generally, the front-stage Boost converter is used to perform the functions of DC voltage boost and maximum power point tracking (MPPT), and then the rear-stage inverter The advantage of photovoltaic system grid-connected control is that the control is simple, but the multi-level syste...

Claims

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Application Information

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IPC IPC(8): H02J3/38H02J3/18H02J3/01
CPCY02A30/60Y02E10/56Y02E40/30Y02E40/40
Inventor 张经炜王宏华王成亮戴锋王哲蓓韩伟许焕清范立新
Owner STATE GRID CORP OF CHINA
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