Parallel method of H-bridge cascaded high-voltage shore power supply based on independent droop control

A shore power supply and cascading technology is applied to electrical components, output power conversion devices, and AC power input to AC power output. Achieve the effects of circulating current suppression, reducing the amount of calculation, and high precision

Active Publication Date: 2021-01-08
澄瑞电力科技(上海)股份公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the above-mentioned deficiencies in the prior art, the present invention provides a parallel connection method of the H-bridge cascaded high-voltage shore power supply based on independent droop control, and realizes capacity expansion through the parallel connection method based on droop control, so as to achieve plug-and-play of equipment It can greatly improve the flexibility of the system, reduce the volume and weight of the shore power supply system, and adopt the independent droop control method to avoid the unbalanced DC voltage of the modules caused by the interphase circulation, and improve the operation stability of the system

Method used

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  • Parallel method of H-bridge cascaded high-voltage shore power supply based on independent droop control
  • Parallel method of H-bridge cascaded high-voltage shore power supply based on independent droop control
  • Parallel method of H-bridge cascaded high-voltage shore power supply based on independent droop control

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Experimental program
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Effect test

Embodiment 1

[0059] Through the matlab simulation software, the parallel control system of two high-voltage shore power supplies is simulated.

[0060] The main circuit parameters of the parallel high-voltage shore power supply are shown in the following table:

[0061] No. parameter name parameter value unit 1 Input voltage 6000 V 2 input frequency 50 Hz 3 Rated Capacity 2 MW 4 DC bus voltage 900 V 5 The output voltage 6600 V 6 Output frequency 60 Hz 7 filter inductor 5 mH 8 filter capacitor 1 μF

[0062] Take a set of sag coefficient m=1×10 -6 ,n=1×10 -6 , observe the parallel operation of the two shore power supplies.

[0063] After the two high-voltage shore power supplies start up with no load and run stably, when t is 0.2s, the parallel contactor closes, and the two shore power supplies run in parallel. At the moment of parallel connection, the impact is very small, and the two shore power supp...

Embodiment 2

[0065] By building an actual system, the parallel connection effect of two high-voltage shore power supplies using an independent droop control method is verified. Its experimental block diagram is as follows Figure 7 As shown, two high-voltage shore power supplies input 10kV voltage, and the output is connected in parallel through two high-voltage switches. The shore power supply runs in parallel with the 1# shore power supply through pre-synchronous start. Figure 8 As shown, the load current is gradually divided evenly. When the 2# shore power supply exits, the load is borne by the 1# shore power supply. The withdrawal process is as follows Figure 9 shown.

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Abstract

The invention discloses a parallel connection method of a high-voltage shore power supply based on independent droop control. Through the parallel connection method based on droop control, capacity expansion is realized, and equipment can be plug-and-play, which can greatly improve the flexibility of the system and reduce the cost of shore power supply. The volume and weight of the system adopt independent droop control method to avoid the unbalanced DC voltage of the modules caused by the interphase circulation and improve the operation stability of the system.

Description

technical field [0001] The invention relates to a parallel connection method of an H-bridge cascaded high-voltage shore power supply based on independent droop control, and belongs to the technical field of parallel control of high-voltage shore power supplies. Background technique [0002] In today's society, the demand for high-power shore power supplies is increasing, and the requirements for flexibility are becoming stronger and stronger. However, the parallel use of high-voltage and large-capacity shore power supplies has become a new demand direction, because this method can not only pass through several power supplies. Parallel connection to increase the purpose of larger capacity, but also to meet the use of large-capacity independent power supply. At the same time, the requirements for the output power quality of large-capacity high-voltage shore power supplies are becoming increasingly stringent, while the contradiction between the operating voltage of power switch...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/42H02M5/458H02M7/493H02M7/5387
CPCH02J3/42H02M5/458H02M7/493H02M7/5387H02M1/007
Inventor 胡金杭苗亚徐源
Owner 澄瑞电力科技(上海)股份公司
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