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A voltage coordination control method for DC distribution network

A DC distribution network, coordinated control technology, applied in AC network circuits, power transmission AC networks, AC network load balancing, etc., can solve problems such as AC and DC load coordination without consideration, and achieve high reliability effects

Active Publication Date: 2018-07-17
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method does not consider the coordination of grid-connected converters, distributed power sources and AC / DC loads in the system, and needs to be improved.

Method used

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  • A voltage coordination control method for DC distribution network
  • A voltage coordination control method for DC distribution network
  • A voltage coordination control method for DC distribution network

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0064] combine figure 2 , to illustrate the effectiveness of this method. Using PSCAD / EMTDC software for simulation, build a two-end DC distribution network system such as Figure 6 shown. The rated voltage of the DC bus is ±7.5kV, and the grid voltage at both ends is 10kV. The voltage is reduced to 6kV through the grid-side transformer, and the outflow direction of the converter is positive.

[0065] The rated capacity of the main converter station is 2MW, the reactive power reference value is 0; the rated capacity of the secondary converter station is 2.5MW, the reactive power reference value is 0, and the drop coefficient of the U-P characteristic curve is -1MW / kV. The AC load is 2MVA, the power factor is 0.95, and the rated voltage is 0.38kV. The AC voltage reference value of the grid-connected converter station is 6kV, and the rated capacity is 3MVA; the DC load is 3MW, which is directly connected to the DC distribution network.

[0066] The fan capacity is 1.5MW, the...

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Abstract

The invention discloses a voltage coordinated control method of a DC power distribution network. By real-time monitoring of a master convertor station, a slave convertor station and a storage battery on port voltage and power, effective control on the voltage of the DC power distribution network is achieved, and system power balance is ensured. When the DC power distribution network is normally running, a draught fan and a photovoltaic cell both run in a maximum power tracking mode to ensure maximum power output of a new energy source; the control switching condition of each power device is determined by local information quantity and does not rely on communication, and decentralized self-discipline control on each power device is achieved; in a transient-state running mode, the storage battery rapidly charges and discharges to ensure seamless switching of a control strategy when nodes for controlling DC voltage are controlled to be switched between the master convertor station and the slave convertor station; and the control strategy considering constraint conditions such as DC voltage offset quantity, grid-connected device capacity and a state of charge (SOC) of the storage battery, and the high reliability of system running is ensured.

Description

【Technical field】 [0001] The invention belongs to the field of direct current distribution network control, and in particular relates to a voltage coordination control method for a direct current distribution network. 【Background technique】 [0002] With social progress and economic development, the power load is increasing rapidly, distributed energy is getting more and more attention, the user's electricity consumption mode has also undergone major changes, and the DC load is growing rapidly. With the change of power supply mode and power consumption mode, the AC distribution network is facing great challenges in many fields such as distributed power supply access, load diversification, power flow balance and coordination, and power quality improvement. The DC distribution network has shown huge economic and technological advantages in reducing the number of converters and commutation times, ensuring the quality of power supply, increasing transmission capacity, and facili...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/36H02J3/38H02J3/32H02J3/24
CPCH02J3/24H02J3/32H02J3/36H02J3/382Y02E10/56Y02E60/60Y02E70/30
Inventor 康小宁马秀达张超蒋帅屈小云王豪
Owner XI AN JIAOTONG UNIV
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