Modularized multi-level comprehensive apparatus combined with photovoltaic generation

A modular multi-level, photovoltaic power generation technology, applied in photovoltaic power generation, circuit devices, reactive power compensation, etc., can solve the problem that the power grid cannot provide energy feedback to the power grid, so as to facilitate fault analysis and fault redundancy protection, shorten Design cycle, effect of increasing capacity level

Active Publication Date: 2016-03-02
WUHAN UNIV
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Problems solved by technology

It also adopts the MMC structure, which saves the transformer at the input end; however, the energy of the capacitors and battery packs connected in parallel at both ends of the MMC sub-module still needs to be obtained from the grid. In this topology, the capacitors and battery packs exist as energy storage modules. Yes, if there is no energy absorbed from the grid when the grid voltage peaks, then energy feedback to the grid cannot be performed when the grid voltage drops and is interrupted, which is the limitation of this patent

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  • Modularized multi-level comprehensive apparatus combined with photovoltaic generation
  • Modularized multi-level comprehensive apparatus combined with photovoltaic generation

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[0025] The features and advantages of the present invention can be further understood through the following detailed description in conjunction with the accompanying drawings. The examples provided are only illustrative of the method of the present invention and do not limit the rest of the present disclosure in any way.

[0026] As shown in Figure 1, a modular multi-level comprehensive compensation device combined with photovoltaic power generation, the compensation device includes three phases, each phase includes two bridge arms, and each bridge arm consists of multiple Submodule and arm inductance L 1 phase in series, through the inductor L 2 And the switch K is connected in parallel to the power grid; the bridge arm inductance L 1 Play the role of suppressing the circulation, between the upper and lower bridge arm inductance is the output point of each phase of the compensation device, such as figure 1 The three points a, b, and c in the middle are shown; the three-pha...

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Abstract

The invention discloses a modularized multi-level comprehensive apparatus combined with photovoltaic generation, and a control method. The modularized multi-level comprehensive apparatus combined with the photovoltaic generation comprises three phases; each phase comprise two bridge arms; each bridge arm is connected with a bridge arm inductor L1 in series through a plurality of sub modules including storage batteries and photovoltaic generation apparatuses, then the bridge arm is connected to a power grid in parallel through an inductor L2 and a switch K. The modularized multi-level comprehensive apparatus adopts the modularized structure, and can be connected with the power grid without connecting a transformer; and the comprehensive apparatus does not need to absorb active power from the power grid, instead, the comprehensive apparatus can supply energy to maintain the stability of the capacitor voltage, and can output active power to the power grid.

Description

technical field [0001] The invention relates to a circuit device or system for power supply or distribution, and the field of electric energy storage systems, and in particular to a modular multi-level comprehensive compensation device combined with photovoltaic power generation. Background technique [0002] With the continuous development of my country's power grid and the grid connection of new energy such as wind energy and solar energy, various power quality problems have appeared in the grid. Harmonic currents caused by the connection of non-linear components, etc., run counter to the increasingly high requirements of power quality in modern society, and methods must be taken to deal with these power quality problems. [0003] At the same time, although the current power generation cost of wind energy, solar energy and other new energy power generation is still high, its cost is constantly falling, and due to its clean and renewable characteristics, it is in rapid devel...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38H02J3/32H02J3/01H02J3/18
CPCH02J3/01H02J3/1842H02J3/32H02J3/383Y02E10/56Y02E40/30Y02E40/40Y02E70/30
Inventor 袁佳歆薛钢陈柏超田翠华杨雨桐
Owner WUHAN UNIV
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