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A power master-slave control method for a DC converter

A control method and converter technology, applied in the direction of converting DC power input to DC power output, AC power input converting to DC power output, control/regulation systems, etc.

Active Publication Date: 2020-11-17
STATE GRID ZHEJIANG ELECTRIC POWER
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the limitations of the above-mentioned various technical solutions, aiming at the above-mentioned problems, it provides a power master-slave control method based on an intermediate frequency high step-up ratio DC converter to solve the problem of reactive power on the AC side. Compensation and reactive power sharing of multiple converters to improve the efficiency of power transmission in DC collection systems

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  • A power master-slave control method for a DC converter
  • A power master-slave control method for a DC converter
  • A power master-slave control method for a DC converter

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Embodiment Construction

[0063] The following will clearly and completely describe the technical solutions in the embodiments of the application with reference to the drawings in the embodiments of the application. Apparently, the described embodiments are only some of the embodiments of the application, not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of this application.

[0064] figure 1 It is a DC converter topology in the embodiment of the present invention. Depend on figure 1 It can be seen that the DC converter includes a parallel inverter module, an intermediate frequency four-winding output step-up transformer, four three-phase diode rectifier bridges and two corresponding high-voltage filter circuits, wherein: the parallel inverter module Including N three-level three-leg inverter bridges and corresponding N LCL circuits with the same topolo...

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Abstract

The invention discloses a power master-slave control method of a DC converter. Under the redesign of the LCL parameters considering reactive power compensation, the control method proposes the power master-slave control of the module parallel inverter. The double-loop structure of the ring maintains the constant active power obtained by the system from the new energy power generation unit; the slave inverter adopts a double-loop control structure of the power outer loop and the bridge arm side inductor current inner loop according to the reference current and voltage of the master inverter. It compensates the reactive power caused by the excitation and leakage inductance of the intermediate frequency transformer in the system, maintains the equal sharing of active and reactive power in the system, realizes parallel current sharing of DC converter modules, and improves the transmission efficiency of the system.

Description

technical field [0001] The invention designs a power master-slave control method of a DC converter, in particular a power master-slave control method of a DC converter with an intermediate frequency and a high step-up ratio. Background technique [0002] In recent years, the large-scale development of large-scale photovoltaic power plants has promoted the continuous development of photovoltaic power generation collection and access systems. face enormous challenges. Compared with the AC collection system, the DC collection system has the advantages of low line cost, small long-distance transmission loss, no reactive power and synchronization, and high stability and reliability of power supply, and has great development potential. In a DC collection system, power electronics-based DC converters must be used to exchange power for connections at different voltage levels. In order to improve the efficiency of power transmission in the DC collection system, it is necessary not ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/335H02M7/5387
CPCH02M3/33569H02M7/493H02M7/5387
Inventor 朱承治沈洁
Owner STATE GRID ZHEJIANG ELECTRIC POWER