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Control method and control system for optical voltage parallel network power generation based on the Z source power conversion

A control method and technology for a control system, which are applied in the field of photovoltaic grid-connected power generation control methods and control systems based on Z-source power conversion, can solve problems such as damage to devices, influence on the service life of devices, increase in output current harmonics, etc. Reliability, small device size, and high conversion efficiency

Inactive Publication Date: 2007-10-17
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantage of this method is that the output current harmonics increase
At the same time, in actual use, there are still situations where various complex electromagnetic interferences lead to up and down straight-through, thus damaging the device and affecting the overall service life of the device

Method used

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  • Control method and control system for optical voltage parallel network power generation based on the Z source power conversion
  • Control method and control system for optical voltage parallel network power generation based on the Z source power conversion
  • Control method and control system for optical voltage parallel network power generation based on the Z source power conversion

Examples

Experimental program
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Effect test

Embodiment 1

[0019] Referring to Fig. 1, a photovoltaic grid-connected power generation control method based on Z-source power conversion, uses voltage sampling module 11 and current sampling module 12 to collect photovoltaic panel voltage Vpv, grid voltage Vgrid, Z-source impedance network shunt capacitor voltage Vc and photovoltaic The battery current Ipv, the grid current Igrid, and the signals obtained by sampling are converted by AD, and then calculated by the DSP control module 3 to obtain a PWM signal sequence with adjustable pulse width. The above-mentioned photovoltaic grid-connected power generation control method based on Z source power conversion according to claim 1 is characterized in that the DSP control module 3 includes:

[0020] A power tracking module for tracking the maximum output power of the solar cell array;

[0021] A boost module for boosting capacitors in the Z source impedance network;

[0022] A current synchronization module is used to ensure that the output ...

Embodiment 2

[0024] With reference to Fig. 1, a kind of control system for implementing the photovoltaic grid-connected power generation control method based on Z source power conversion described in claim 1 is characterized in that it comprises a voltage sampling module 11, a current sampling module 12, an AD conversion module 2 and a DSP The control module 3, the DSP control module 3 is used to control the sampling of the voltage sampling module 11 and the current sampling module 12, and the voltage sampling module 11 and the current sampling module 12 are respectively used to collect the photovoltaic panel voltage Vpv, the grid voltage Vgrid, and the shunt capacitor voltage Vc And the photovoltaic cell current Ipv, grid current Igrid, the signals sampled by the voltage sampling module 11 and the current sampling module 12 are subjected to AD conversion by the AD conversion module 2, and then provided to the DSP control module 3, and the pulse width is obtained by the DSP control module 3....

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Abstract

The invention discloses a photovoltaic grid-connected control method based on Z source power conversion, and its control system. The invention uses a voltage sampling module, and a current sampling module to collect a photovoltaic cell panel voltage Vpv, a power grid voltage Vgrid, a parallel capacitance voltage of Z source impedance network Vc, a photovoltaic cell Ipv, and a power grid current Igrid; the sampling signal after via an AD converter, is calculated by a DSP module to get a pulse width adjustable PWM signal sequence. The DSP control module includes: a power tracking module, for tracking the largest output power of a solar cell array; a boost module, for boosting the capacitor in the Z source impedance network; and a current synchronization module, for guaranteeing the phase synchronization of the filter reactor output current with the power grid voltage.

Description

technical field [0001] The invention belongs to inverter grid-connected control technology, and relates to a measurement control system for distributed new energy grid-connected power supply, in particular to a photovoltaic grid-connected power generation control method and control system based on Z-source power conversion. Background technique [0002] The development of economy and society has made people's demand for energy continue to rise. The traditional energy utilization structure dominated by non-renewable energy such as petroleum can no longer meet the needs of sustainable social and economic development; on the other hand, the use of traditional energy has serious environmental pollution. question. In stark contrast to traditional energy sources, renewable energy power generation represented by solar energy is clean, pollution-free and inexhaustible. Therefore, making full use of renewable energy to generate electricity and improving the structure of energy utili...

Claims

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Application Information

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IPC IPC(8): H02J3/38G05F1/67
CPCY02E10/58Y02E10/56
Inventor 郑建勇梅军张先飞袁玲盛立健于明辉刘顺炮
Owner SOUTHEAST UNIV
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