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Power system and power converters

A technology for power converters and power supply systems, applied in the direction of regulating electrical variables, control/regulating systems, instruments, etc., can solve the problems of increasing bus voltage, indeterminate current command, unstable bus voltage, etc., and achieve high reliability.

Active Publication Date: 2006-05-03
HITACHI LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, for example, if the main machine 1, which is a power converter that controls the bus voltage, stops, the bus voltage becomes unstable because there is no power converter that has the function of controlling the bus voltage, and eventually becomes 0, and power supply to the load is stopped, or The current command from the master becomes uncertain, and the output current of the slave 2 becomes larger than the actual load, thereby increasing the bus voltage, causing an external overvoltage on the load and destroying the load.

Method used

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  • Power system and power converters
  • Power system and power converters
  • Power system and power converters

Examples

Experimental program
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Embodiment 1

[0025] Embodiment 1 will be described below. The power supply system of this embodiment, such as figure 1 As shown, it consists of an AC power source 1 and an AC power source 2 connected to a bus bar 100 , and one or more load devices (not shown) supplied with AC power are connected to the bus bar 100 .

[0026] The AC power supply 1 includes: a DC voltage source 11; a DC / AC converter 12 using the DC voltage source 11 as a power source to obtain an AC output; a filter circuit 13 for shaping the AC output output by the DC / AC converter 12; The transformer 14 connected between the filter circuits 13 to absorb the neutral point potential difference here; the conversion mechanism 15 that converts the voltage on the bus side of the transformer 14 into DC; outputs the target voltage on the bus side of the transformer 14 with DC The output voltage command generating device 16 of the output voltage command; the output control mechanism 17 that adjusts the AC output of the DC / AC conve...

Embodiment 2

[0037] Embodiment 2 will be described below. Other embodiments of the present invention are as image 3 shown. image 3 This is an example in which a plurality of AC power sources (power converters) 2 that supply current are connected to a bus bar that is a slave machine. exist image 3 Above, in order to distinguish the slaves, they are named 2-1, 2-2, ... 2-n. The AC power supply (power converter) 1 of the master is configured to transmit AC output current information to a plurality of slaves 2 . Furthermore, an operation mode command generating means 23 is provided. AC power sources 1 and 2 are the same as in Embodiment 1. The operation mode command generation mechanism 23 receives the state information of each AC power source from the communication mechanism 1 of the AC power source 1, 2, determines the operation mode of each AC power source 1, 2, and sends the command in the determined operation mode on each AC power source. action command. With this configuration,...

Embodiment 3

[0041] Embodiment 3 will be described below. The power supply system of this embodiment is as Figure 5 As shown, the AC power sources 1, 2-1, 2-2, ... 2-n and the bus are connected through a connection circuit disconnection mechanism 31 composed of a circuit breaker, and the bus 100 includes a bus disconnection mechanism 32 composed of a circuit breaker . The AC power sources 1, 2-1, 2-2, ... 2-n are the same as the AC power sources 1 and 2 of the second embodiment. The bad AC power sources 1 , 2 - 1 , 2 - 2 , . In addition, with the bus disconnection mechanism 32, a power converter parallel group consisting of one or more AC power sources can be formed when the bus is disconnected.

[0042] Furthermore, it also includes a cut-off instruction unit that sends an operation command in the voltage control mode or current control mode determined to each power converter (not shown) according to the circuit cut-off state of the connection circuit cut-off unit 31 . In addition, i...

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Abstract

A power supply system is composed of a first power converter (1) controlling the AC voltage of a bus (100), and a second power converter (2) controlling the AC current supplied to the bus (100). In a power supply system that converts DC to AC to supply the busbar, the first and second power converters (1, 2) each have a busbar voltage control function and an output current control function, and can operate in either voltage control mode or current control mode. Action in one mode. Therefore, even when the power converter controlling the bus voltage is stopped, the power supply system and the power converter thereof can be provided which can stabilize the bus voltage without stopping power supply to loads.

Description

technical field [0001] The present invention relates to a power supply system composed of parallel operation of power converters and the parallel operation mode of the power converter and the power converter converting DC to AC, especially relates to the operation continuation mode when the power converter is stopped. Background technique [0002] By parallel operation of the power converter controlling the AC output (hereinafter referred to as the master) and the power converter controlling the output current (hereinafter referred to as the slave), the reliability of the power supply system can be improved in the power supply to large-capacity loads. sexual indicators. In order to efficiently perform parallel operation of the power converters, it is necessary to suppress cross flow between the power converters. [0003] In Patent Document 1, it is described that the AC current output by the host computer (AC power supply 1 ) that controls the bus voltage is converted into ...

Claims

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Application Information

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IPC IPC(8): H02J3/00G05F1/12H02M7/493
Inventor 稻荷田聪
Owner HITACHI LTD