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Novel topological structure voltage source type inverter and adjusting method

A topology, voltage source technology, applied in electrical components, output power conversion devices, AC power input into DC power output and other directions, can solve complex control, limited topology and device parameters, complex topology, etc. problems, to achieve the effect of wide compensation range, high voltage level, rich topology types and application prospects

Active Publication Date: 2013-08-07
WUHAN UNIV
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Problems solved by technology

The three-phase bridge structure can conveniently realize the functions of positive sequence reactive power compensation, negative sequence current compensation, harmonic compensation and active power regulation, but limited by the topology structure and device parameters, its application also has great limitations.
Among them, due to the complex topology of multi-level diode clamps and multi-level flying capacitors, the number of levels and practical voltage levels are limited; device series and MMC technology solve the problem of inverters operating under high voltage. The problem is that MMC technology can also realize multi-level functions at the same time, but the control of the two is more complicated, and it is only applied in a few projects

Method used

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  • Novel topological structure voltage source type inverter and adjusting method
  • Novel topological structure voltage source type inverter and adjusting method
  • Novel topological structure voltage source type inverter and adjusting method

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Embodiment

[0043] The structure and working principle of the patent of the present invention will be described below in conjunction with the accompanying drawings.

[0044] 1. The composition of the new voltage source inverter topology.

[0045] see figure 1 , is a topology diagram of a new voltage source inverter, which is characterized in that: on the basis of star-connected cascaded inverters, a three-phase bridge inverter is connected at the neutral point. The whole device is connected to the grid through connecting reactance. In order to facilitate subsequent analysis, various quantities such as device current, grid voltage, connection reactance voltage, and device output voltage and their reference directions are specified here. This topology combines the advantages of the cascaded structure and the bridge structure: when only capacitors are connected to the DC side, it has the ability to compensate reactive power, harmonics and negative sequence current, and can work under highe...

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Abstract

The invention relates to a novel topological structure voltage source type inverter and an adjusting method. The structure is a star-like topological structure and is formed by connecting a three-phase bridge type inverter in series at a neutral point of cascaded inverters connected in a star shape. Compared with the conventional cascaded inverters connected in the star shape, the novel topological structure theoretically has a function of completely compensating negative sequence current; and compared with the conventional three-phase bridge type inverter, the novel topological structure can realize extended application under high voltage level without using a device cascade or MMC (Multilevel Converter) structure. In the novel topological structure, a direct current side of the three-phase bridge type inverter can be connected with a direct current network, energy storage equipment or a power grid through a current transformer; the inverter can be widely applied to the fields of flexible direct current power transmission, new energy connection, high voltage frequency converter and the like; and the application prospect of the voltage source type inverter in the corresponding field is expanded. The novel topological structure has good generalization performance based on mature unit cascade and three-phase inverter structure and control technology.

Description

technical field [0001] The invention relates to a voltage source inverter and an adjustment method, in particular to a voltage source inverter with a new topological structure and an adjustment method. Background technique [0002] With the development of the power system, the power quality problem has attracted more and more attention. The voltage source inverter based on fully controlled devices has been more and more used in the fields of reactive power compensation, motor speed regulation, DC transmission and other fields due to its fast response speed and superior compensation performance. [0003] At present, there are two main topological structures of voltage source inverters: [0004] The first is a three-phase bridge structure. The three-phase bridge structure can conveniently realize the functions of positive sequence reactive power compensation, negative sequence current compensation, harmonic compensation and active power regulation, but limited by the topolog...

Claims

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Application Information

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IPC IPC(8): H02M7/5387H02J3/38
Inventor 查晓明李尚盛宫金武戴喜良孙建军
Owner WUHAN UNIV
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