Voltage balanced multilevel voltage source converter system
First Claim
1. A multilevel converter system, comprising:
- a rectifier having at least one phase leg and a source input node for each of said phases, said rectifier further having a plurality of rectifier DC output nodes;
an inverter having at least one phase leg and a load output node for each of said phases, said inverter further having a plurality of inverter DC input nodes; and
a DC link having a plurality of rectifier charging means and a plurality of inverter discharging means, said plurality of rectifier charging means connected in series, one of said rectifier charging means disposed between and connected in an operable relationship with each adjacent pair of said rectifier DC output nodes, said plurality of inverter discharging means connected in series, one of said inverter discharging means disposed between and connected in an operable relationship with each adjacent pair of said inverter DC input nodes, each of said rectifier DC output nodes individually electrically connected to said respective inverter DC input nodes;
whereby each of said rectifier DC output nodes and each of said inverter input nodes are voltage balanced by to the respective charging and discharging of said rectifier charging means and said inverter discharging means.
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Accused Products
Abstract
A voltage balanced multilevel converter for high power AC applications such as adjustable speed motor drives and back-to-back DC intertie of adjacent power systems. This converter provides a multilevel rectifier, a multilevel inverter, and a DC link between the rectifier and the inverter allowing voltage balancing between each of the voltage levels within the multilevel converter.
The rectifier is equipped with at least one phase leg and a source input node for each of the phases. The rectifier is further equipped with a plurality of rectifier DC output nodes. The inverter is equipped with at least one phase leg and a load output node for each of the phases. The inverter is further equipped with a plurality of inverter DC input nodes. The DC link is equipped with a plurality of rectifier charging means and a plurality of inverter discharging means. The plurality of rectifier charging means are connected in series with one of the rectifier charging means disposed between and connected in an operable relationship with each adjacent pair of rectifier DC output nodes. The plurality of inverter discharging means are connected in series with one of the inverter discharging means disposed between and connected in an operable relationship with each adjacent pair of inverter DC input nodes. Each of said rectifier DC output nodes are individually electrically connected to the respective inverter DC input nodes. By this means, each of the rectifier DC output nodes and each of the inverter DC input nodes are voltage balanced by the respective charging and discharging of the rectifier charging means and the inverter discharging means.
108 Citations
10 Claims
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1. A multilevel converter system, comprising:
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a rectifier having at least one phase leg and a source input node for each of said phases, said rectifier further having a plurality of rectifier DC output nodes; an inverter having at least one phase leg and a load output node for each of said phases, said inverter further having a plurality of inverter DC input nodes; and a DC link having a plurality of rectifier charging means and a plurality of inverter discharging means, said plurality of rectifier charging means connected in series, one of said rectifier charging means disposed between and connected in an operable relationship with each adjacent pair of said rectifier DC output nodes, said plurality of inverter discharging means connected in series, one of said inverter discharging means disposed between and connected in an operable relationship with each adjacent pair of said inverter DC input nodes, each of said rectifier DC output nodes individually electrically connected to said respective inverter DC input nodes; whereby each of said rectifier DC output nodes and each of said inverter input nodes are voltage balanced by to the respective charging and discharging of said rectifier charging means and said inverter discharging means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification