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Power mixed conversion system

A hybrid transformation and power technology, applied in the direction of electrical components, etc., can solve the problem that the DC capacitor voltage balance control is not easy to achieve, and achieve the effect of easy balance control.

Inactive Publication Date: 2013-07-17
ELECTRIC POWER RES INST OF GUANGDONG POWER GRID +1
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Based on this, it is necessary to provide a power hybrid conversion system that can easily realize DC capacitor voltage balance control in order to solve the problem that the DC capacitor voltage balance control is not easy to achieve in the general MMC-based power hybrid conversion system

Method used

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Embodiment Construction

[0021] Figure 1, image 3 and Figure 4 As shown, a power hybrid conversion system includes a modular multilevel converter 100 and a DC-DC isolator 200, the AC side of the modular multilevel converter 100 is connected to a high-voltage AC power grid, and the modular The DC side of the multilevel AC 100 is connected to the high-voltage DC power grid. The DC-DC isolator 200 includes a first capacitor 210 and a second capacitor 220. The positive and negative DC input ends of the DC-DC isolator 200 are respectively connected to the The positive and negative of the above-mentioned high-voltage DC grid, the DC output end of the DC-DC isolator 200 is connected to the low-voltage DC grid, the DC input end of the DC-DC isolator 200 is connected in parallel with the second capacitor 220, and the DC- The DC output terminal of the DC isolator 200 is connected in parallel with the first capacitor 210 .

[0022] In this embodiment, the first capacitor and the second capacitor may be the s...

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Abstract

The invention provides a power mixed conversion system which comprises a modularized multi-level converter (MMC) and a direct current (DC)-DC isolator. The alternating current side of the MMC is connected with a high-voltage alternating current power grid, and the direct current side of the MMC is connected with a high-voltage direct current power grid. An anode and a cathode at the direct current input end of the DC-DC isolator are connected with an anode and a cathode of the high-voltage direct current power grid respectively. The DC-DC isolator comprises capacitors connected in parallel at the direct current input end and the direct current output end of the DC-DC isolator respectively, and the direct current output end of the DC-DC isolator is connected with a low-voltage direct current power grid. The output capacitors on the direct current side of the DC-DC isolator are connected in parallel. When the direct current capacitor voltage of the MMC is unbalanced, the portion in the MMC with high capacitor voltage passes through the DC-DC isolator by means of the low-voltage direct current power grid and passes through the DC-DC isolator again to charge the capacitors with low voltage and increase voltage value. Therefore, voltage stability on the direct current side can be ensured, and automatic balancing of the direct capacitor voltage of the MMC can be achieved accordingly.

Description

technical field [0001] The invention relates to the technical field of power systems, in particular to a power hybrid conversion system. Background technique [0002] With the continuous development of the world economy, the demand for various forms of electricity is growing faster and faster, and the problems of energy shortage and environmental protection are becoming more and more serious. Renewable energy power generation technologies represented by wind power and solar power are gradually becoming the future power generation technology. The development direction and research hotspots of system technology. However, these clean energy sources often have characteristics such as scattered locations and far away from power user centers. The high-voltage direct current transmission system based on voltage source converters can connect these small distributed power systems to the AC grid in an economical and environmentally friendly way. High voltage and high power The voltag...

Claims

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Application Information

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IPC IPC(8): H02J5/00
Inventor 张俊峰易杨陈迅王丹毛承雄罗坚强陆继明
Owner ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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