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Converter control system, converter control method and microgrid

A control system and converter technology, applied in the direction of AC network circuits, power transmission AC networks, circuit devices, etc., can solve the problems of low reliability, single structure, high technical requirements, and improve safety and reliability. The effect of low communication requirements and low communication requirements

Pending Publication Date: 2021-02-12
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its energy management and operation control are much more complicated than a single AC and DC microgrid, and its technical requirements are correspondingly higher
At the same time, the current AC-DC hybrid microgrid connects the AC subnet and the DC subnet through a bidirectional AC / DC converter. The structure is single, and the reliability is not high in the island operation state, so it is difficult to adapt to the future market-oriented decentralized distribution network.
[0004] When the AC-DC network is connected to the large power grid, there is no problem of the flow distribution of active power and reactive power. However, sometimes, the micro-grid needs to enter the island mode. For communication, this method is obviously time-consuming and laborious when there is a small disturbance

Method used

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  • Converter control system, converter control method and microgrid
  • Converter control system, converter control method and microgrid
  • Converter control system, converter control method and microgrid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Inverter control system such as figure 2 , collect the DC line voltage U dc And input to the autonomous operation control module and the DC side active power calculation module to collect the DC voltage I dc And input to the active power calculation module on the DC side to collect the AC line voltage u abc and AC line current i abc And input the AC power measurement calculation module. In the normalization processing module, the apparent power S and the active power P are normalized and converted to obtain the apparent power deviation ∆S and input to the autonomous operation control module, and the reference active power P ref After normalized processing with the active power P, the difference is obtained to obtain the voltage deviation ∆U dc And input to the autonomous operation control module. The local output Q of the converter obtained in real time by the coordinate transformation power calculation module is input to the autonomous operation control module, ...

Embodiment 2

[0054] A control method corresponding to the converter control system in Embodiment 1, comprising the following steps

[0055] S01 according to the AC line current signal i abc and AC line voltage u abc Calculate the AC line current signal i abc The d-q axis component of the AC line voltage u abc The d-q axis component, apparent power S and reactive power Q of ;

[0056] S02 According to the reference active power P re、 Reference active power P ref Get the power deviation ∆S from the apparent power S, according to the reference active power P ref and the active power P to get the voltage difference ∆U dc ;

[0057] S03 will voltage deviation ∆U dc , The collected DC voltage U dc and DC voltage reference value U dcref Compare to get the d-axis current reference value i dref ;The reactive power deviation ∆S, reactive power Q and reactive power reference value Q ref Compare to get the q-axis current reference value i qref ;

[0058] S04 According to the q-axis cur...

Embodiment 3

[0067] The converter control system in Embodiment 1 is applied to the microgrid.

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Abstract

The invention relates to a converter control system, a control method and a microgrid. The control system comprises an AC power calculation module, an autonomous operation control module, a normalization operation subtraction module, a current inner loop control module and a DC power calculation module. The control method corresponds to the control system. According to the control system, the AC / DC lines of the AC / DC interconnected microgrid can adopt any topological structure, active power distribution can be automatically realized in all the AC / DC lines, and the converter adopts a decentralized control strategy, does not depend on real-time communication, has low communication requirements and high robustness, and when the power is disturbed or the network structure is changed, the self-adaptive adjustment capability is realized.

Description

technical field [0001] The invention relates to a converter control system, a converter control method and a microgrid, belonging to the field of power systems. Background technique [0002] Since the beginning of the 21st century, AC microgrids have been widely studied. However, only using a single AC power source to power the system will not only increase the system cost and loss, but also bring corresponding harmonic problems. With the increasing number of DC-type distributed power sources and DC loads in micro-grids, scientists have proposed DC micro-grids. DC micro-grids use DC power sources to cluster DC loads to minimize AC-to-DC conversion losses. A more practical but relatively complex network AC-DC hybrid microgrid emerges at the historic moment, which combines the advantages of AC microgrid and DC microgrid, and the AC and DC microgrids are connected through one or more "interconnected converters" , forming an AC-DC hybrid microgrid. [0003] AC-DC hybrid microg...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/46H02J3/38H02J3/36
CPCH02J3/46H02J3/388H02J3/36Y02E60/60
Inventor 何承树陈谦王晨晟史锐陈嘉雯王苏颖姚文猗周路遥
Owner HOHAI UNIV
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