Improved master-slave control method for DC distribution network

A technology of DC distribution network and control method, which is applied in the direction of DC network circuit device, power transmission AC network, electrical components, etc. The effect of improving rapidity and reliability

Pending Publication Date: 2020-02-14
ELECTRIC POWER SCI & RES INST OF STATE GRID TIANJIN ELECTRIC POWER CO +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

DC voltage droop control means that all converter stations with power regulation capabilities use the given slope relationship between each DC power (or current) and DC voltage to realize DC voltage control shared by multiple stations. This control method does not require an upper-level controller And communication, with good modularity and scalability, but there are deviations in steady-state operation, and the DC distribution network load changes complex, frequent and large load changes will cause voltage fluctuations, and even voltage deviations exceed the rated range during stable operation, It is difficult to select the slope of this control method
Voltage margin control means that when the main converter station fails or the power exceeds the limit and cannot continue to maintain a constant DC voltage, another converter station will switch to the constant DC voltage control mode and run at the new DC v

Method used

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  • Improved master-slave control method for DC distribution network
  • Improved master-slave control method for DC distribution network
  • Improved master-slave control method for DC distribution network

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Embodiment Construction

[0035] Embodiments of the present invention are described in further detail below in conjunction with the accompanying drawings:

[0036] The medium voltage DC power distribution system involved in the present invention includes two MMC converter stations, namely the main converter station and the slave converter station, such as figure 1 As shown, two converter stations form a double-terminal DC distribution network structure in a hand-in-hand manner. One converter station MMC1 is set as the master station, and the other converter station MMC2 is set as the slave station.

[0037]An improved master-slave control method for a direct current distribution network, comprising the following steps:

[0038] Step 1. Design an adaptive droop controller with a dead zone;

[0039] The concrete steps of described step 1 include:

[0040] (1) Measure the three-phase voltage and current on the grid side of MMC2, and measure the voltage and current on the DC side of MMC2;

[0041] (2) O...

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Abstract

The invention relates to an improved master-slave control method for a DC distribution network. The invention is technically characterized in that the method comprises the following steps: Step 1, designing an adaptive droop controller with a dead zone; and 2, setting one MMC converter station as the main station with the working mode being a constant voltage control mode, and setting the other MMC converter stations as slave stations with the working mode being the control mode of the adaptive droop controller with the dead zone in the Step 1. According to the invention, seamless switching ofoperation modes can be realized and the stability of DC voltage can be ensured when communication failure occurs.

Description

technical field [0001] The invention belongs to the technical field of direct current distribution networks, and relates to a control method for a converter station, in particular to an improved master-slave control method for a direct current distribution network. Background technique [0002] With the rapid development of renewable energy, more and more new energy power generation and energy storage are connected to the distribution network in large quantities, and the power flow of the distribution network has become a two-way flow, which affects the capacity, reliability and power of the distribution network. Higher requirements are put forward for quality, etc., but the current traditional AC distribution network is not designed for bidirectional power flow, and cannot meet the requirements of some users. In addition, with the great progress of power electronics technology and DC load technology, the DC distribution network has attracted extensive attention from scholar...

Claims

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Application Information

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IPC IPC(8): H02J3/36H02J1/00
CPCH02J3/36H02J1/00Y02E60/60
Inventor 霍现旭徐科李树鹏尚学军李国栋张剑杨卫东吴东谢兴峰吴在军曹骁勇
Owner ELECTRIC POWER SCI & RES INST OF STATE GRID TIANJIN ELECTRIC POWER CO
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