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A coordinated modulation method for hybrid cascaded photovoltaic systems with energy storage

A modulation method and photovoltaic system technology, which are applied in photovoltaic power generation, conversion of irreversible DC power input to AC power output, energy storage, etc. , the effect of reducing switching loss

Inactive Publication Date: 2019-10-11
HUBEI UNIV OF TECH
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Problems solved by technology

[0005] In order to overcome the shortcomings of the above existing technologies, the purpose of the present invention is to provide a coordinated modulation method suitable for hybrid cascaded photovoltaic systems with energy storage, for the structure of hybrid cascaded photovoltaic inverters with energy storage units, Solve the problem of increased harmonic content caused by different output voltage amplitudes and phases between different units

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  • A coordinated modulation method for hybrid cascaded photovoltaic systems with energy storage
  • A coordinated modulation method for hybrid cascaded photovoltaic systems with energy storage
  • A coordinated modulation method for hybrid cascaded photovoltaic systems with energy storage

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[0029] In order to facilitate those of ordinary skill in the art to understand and implement the present invention, the present invention will be described in further detail below in conjunction with the examples. It should be understood that the implementation examples described here are only used to illustrate and explain the present invention, and are not intended to limit the present invention.

[0030] Such as figure 1 As shown, the hybrid cascaded photovoltaic system with energy storage is composed of energy storage units and ordinary photovoltaic units, where the energy storage unit is composed of energy storage elements and H-bridge inverters, and the ordinary photovoltaic units are composed of photovoltaic cells and H-bridge inverters The structure and DC side voltage of the two units are different, and the number is also different. The present invention takes a photovoltaic inverter cascaded with an energy storage unit and multiple ordinary photovoltaic units as an e...

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Abstract

The invention discloses a coordinated modulation method suitable for a hybrid cascaded photovoltaic system with energy storage. The hybrid cascaded photovoltaic system with energy storage is composed of an energy storage unit and a common photovoltaic unit. Units and ordinary photovoltaic units adopt different coordinated modulation methods: adopt specific harmonic elimination modulation method for energy storage units, use carrier phase shift pulse width modulation method for ordinary photovoltaic units, and use the output voltage of ordinary photovoltaic units to compensate energy storage units Low-frequency harmonics in the output voltage waveform, so as to realize the coordinated modulation of the entire photovoltaic system. The method proposed by the present invention can solve the output modulation problem of cascaded inverters under the condition that two different units have different DC side voltages and output voltage amplitudes and phases, and can eliminate low frequency in a wide modulation ratio range. Harmonics, easy to calculate, applicable to both single-phase and three-phase systems.

Description

technical field [0001] The invention belongs to the technical field of hybrid cascaded photovoltaic system modulation, and specifically relates to a coordinated modulation method suitable for a hybrid cascaded photovoltaic system with energy storage, suitable for distributed or centralized photovoltaic grid-connected systems, with a first-level cascaded A single-phase or multi-phase H-bridge cascaded photovoltaic inverter of the energy storage unit. Background technique [0002] The cascaded multi-level inverter can achieve a large output voltage through a small DC voltage and a low switching frequency. It is widely used in photovoltaic grid-connected systems. The conventional H-bridge cascaded photovoltaic inverter In the system, the structure and function of each unit are the same, so the output voltage waveform that meets the requirements of grid-connected power generation can be obtained by using a unified carrier phase-shift pulse width modulation method. The method of...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/38H02J3/28H02M1/12H02M7/48
CPCH02J3/383H02J3/28H02M1/12H02M7/48H02M1/007Y02E10/56Y02E70/30
Inventor 熊兰杨雯
Owner HUBEI UNIV OF TECH
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