公开(公告)号：US08787048B2

公开(公告)日：2014-07-22

申请号：US13380532

申请日：2010-06-29

申请人： Veimar Yobany Moreno-Castañeda ,  Chunmei Feng ,  Jeremy Stephen Prevost Knight ,  Richard Stuart Webb

发明人： Veimar Yobany Moreno-Castañeda ,  Chunmei Feng ,  Jeremy Stephen Prevost Knight ,  Richard Stuart Webb

IPC分类号： H02M7/00

CPC分类号： H02M7/23

摘要： A method is described for controlling a plurality of parallel-connected power converters 20a, 20b, each of which operates in accordance with a pulse width modulation (PWM) strategy defined by an independent voltage carrier signal and an independently controllable modulating sinusoidal voltage signal which are used to generate a PWM command signal for each PWM strategy. The voltage carrier signals of the PWM strategies have the same switching period and desynchronisation of the PWM command signals causes an unwanted circulating current to flow between the power converters 20a, 20b. The method thus comprises providing the independently controllable modulating sinusoidal voltage signal of the PWM strategy of at least one of the plurality of power converters 20a, 20b with a dc voltage offset to modify the PWM command signal of the at least one power converter and thereby increase the synchronisation of the PWM command signals so that the magnitude of any unwanted circulating current is reduced. The typically determined based on the magnitude of the circulating current flowing between the parallel-connected power converters 20a, 20b.

摘要翻译： 描述了一种用于控制多个并联电力转换器20a，20b的方法，每个电力转换器20a，20b根据由独立电压载波信号和独立可控的调制正弦电压信号定义的脉宽调制（PWM）策略进行操作， 用于为每个PWM策略生成PWM指令信号。 PWM策略的电压载波信号具有相同的开关周期，并且PWM指令信号的去同步使得不期望的循环电流在功率转换器20a，20b之间流动。 因此，该方法包括提供具有直流电压偏移的多个功率转换器20a，20b中的至少一个功率转换器20a，20b的PWM策略的独立可控的调制正弦电压信号，以修改至少一个功率转换器的PWM命令信号，从而增加 PWM命令信号的同步，使得任何不需要的循环电流的幅度减小。 通常基于在并联功率转换器20a，20b之间流动的循环电流的大小来确定。

公开(公告)号：US20120155131A1

公开(公告)日：2012-06-21

申请号：US13380532

申请日：2010-06-29

申请人： Veimar Yobany Moreno-Castañeda ,  Chunmei Feng ,  Jeremy Stephen Prevost Knight ,  Richard Stuart Webb

发明人： Veimar Yobany Moreno-Castañeda ,  Chunmei Feng ,  Jeremy Stephen Prevost Knight ,  Richard Stuart Webb

IPC分类号： H02M7/04

CPC分类号： H02M7/23

摘要： A method is described for controlling a plurality of parallel-connected power converters 20a, 20b, each of which operates in accordance with a pulse width modulation (PWM) strategy defined by an independent voltage carrier signal and an independently controllable modulating sinusoidal voltage signal which are used to generate a PWM command signal for each PWM strategy. The voltage carrier signals of the PWM strategies have the same switching period and desynchronisation of the PWM command signals causes an unwanted circulating current to flow between the power converters 20a, 20b. The method thus comprises providing the independently controllable modulating sinusoidal voltage signal of the PWM strategy of at least one of the plurality of power converters 20a, 20b with a dc voltage offset to modify the PWM command signal of the at least one power converter and thereby increase the synchronisation of the PWM command signals so that the magnitude of any unwanted circulating current is reduced. The typically determined based on the magnitude of the circulating current flowing between the parallel-connected power converters 20a, 20b.

摘要翻译： 描述了一种用于控制多个并联电力转换器20a，20b的方法，每个电力转换器20a，20b根据由独立电压载波信号和独立可控的调制正弦电压信号定义的脉宽调制（PWM）策略进行操作， 用于为每个PWM策略生成PWM指令信号。 PWM策略的电压载波信号具有相同的开关周期，并且PWM指令信号的去同步使得不期望的循环电流在功率转换器20a，20b之间流动。 因此，该方法包括提供具有直流电压偏移的多个功率转换器20a，20b中的至少一个功率转换器20a，20b的PWM策略的独立可控的调制正弦电压信号，以修改至少一个功率转换器的PWM命令信号，从而增加 PWM命令信号的同步，使得任何不需要的循环电流的幅度减小。 通常基于在并联功率转换器20a，20b之间流动的循环电流的大小来确定。

公开(公告)号：US20120243274A1

公开(公告)日：2012-09-27

申请号：US13380082

申请日：2010-06-29

申请人： Chunmei Feng ,  Veimar Yobany Moreno-Castañeda ,  Richard Stuart Webb ,  Jeremy Stephen Prevost Knight

发明人： Chunmei Feng ,  Veimar Yobany Moreno-Castañeda ,  Richard Stuart Webb ,  Jeremy Stephen Prevost Knight

IPC分类号： H02M7/08

CPC分类号： H02M7/23

摘要： A method is described for controlling a plurality of power converters 1, 2 connected in parallel between an ac arrangement 12 and a common dc link 16, each of the power converters 1, 2 operating in accordance with a pulse width modulation (PWM) strategy and having an independently variable dc link reference voltage. The method comprises modifying an output voltage droop characteristic of at least one of the plurality of parallel-connected power converters 1, 2 by varying the dc link reference voltage of the at least one power converter 1, 2 based on the output current of the at least one power converter 1, 2 and the average of the output currents of the plurality of power converters 1, 2.

摘要翻译： 描述了一种用于控制在交流装置12和公共直流链路16之间并联连接的多个功率转换器1,2的方法，每个功率转换器1,2根据脉冲宽度调制（PWM）策略操作， 具有独立可变的直流链路参考电压。 该方法包括通过基于所述至少一个功率转换器1,2的输出电流改变至少一个功率转换器1,2的直流链路参考电压来修改多个并联功率转换器1,2中的至少一个的输出电压下降特性。 至少一个功率转换器1,2和多个功率转换器1,2的输出电流的平均值。