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Control method of multi-power grid-connected system based on modular multi-level converter

A modular multi-level and control method technology, applied in the direction of converting irreversible DC power input into AC power output, single-grid parallel feeding arrangement, etc., can solve the problem of DC component of grid-connected current.

Active Publication Date: 2016-03-23
SHANDONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the inconsistency of the DC power supply voltage will cause a certain DC component in the grid-connected current, which needs to be suppressed

Method used

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  • Control method of multi-power grid-connected system based on modular multi-level converter
  • Control method of multi-power grid-connected system based on modular multi-level converter
  • Control method of multi-power grid-connected system based on modular multi-level converter

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Embodiment Construction

[0050] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0051] The control strategy of the energy storage system based on MMC consists of four parts: inverter power control, grid-connected power supply maximum power point tracking control and SOC balance control, circulating current control, and grid-connected current DC component suppression. The focus of the present invention is to propose an appropriate control strategy for the problems existing in the multi-level grid-connected system based on MMC, and flexibly control the circulating current and suppress the grid-connected current according to the needs of SOC balance control and maximum power point tracking control. DC component.

[0052] As mentioned above, because the circulating current will cause power loss, it is not desirable to perform power exchange through the interphase circulating current under normal circumstances. When it is necessary to u...

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Abstract

The invention discloses a multi-power-supply gridconnected system control method based on a modularized multilevel convertor. The multi-power-supply gridconnected system control method comprises the following steps: the power control part of the modularized multilevel convertor generates a sinusoidal modulation wave; the sinusoidal modulated wave is sequentially subject to direct current supply control, an interphase circumfluence control and a gridconnected current direct current component inhibit control to superpose corresponding regulation value, and is finally subject to carrier wave dephasing SPWM modulation to generate a switch driving signal. The multi-power-supply gridconnected system control method can flexibly control the interphase circumfluence according to the operation state of the multi-power-supply gridconnected system.

Description

technical field [0001] The invention relates to a control method for a multi-power grid-connected system based on a modular multilevel converter. Background technique [0002] With the increasing energy crisis and environmental protection issues, the research on renewable energy power generation technology has attracted much attention. In the renewable energy grid-connected power generation system, the power converter is an important part. Renewable energy sources (such as photovoltaic arrays, wind turbines, fuel cells, etc.) connected to the grid need to transmit energy to the grid through inverters. [0003] At present, the power converters commonly used in renewable energy grid-connected power generation systems include two-level inverters, neutral-point clamped multi-level inverters, cascaded multi-level inverters, and modular multi-level inverters. level converter, etc. [0004] For two-level inverters and neutral-point clamped multi-level inverters, after connecting...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/38H02M7/49
Inventor 高峰张磊
Owner SHANDONG UNIV
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