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US 11,456,660 B2Granted
Grounding scheme for power conversion system
AssigneeGeneral Electric Company
InventorsZhihui Yuan, Stefan Schroeder, Jie Shen, Mohamed Ahmed Abdelmohsen Hashem, Yunzheng Chen
Life of this patent
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Abstract
A power conversion system includes one or more power conversion devices coupled to a grid connection. Each of the power conversion devices includes a power converter for converting a first multiphase current provided by the grid connection into a second current; a grid side filter coupled between the grid connection and an input of the power converter; a load side filter coupled to an output of the power converter; neutral points of the grid side filter and the load side filter connected together to form a first node; wherein the first node is not directly grounded.
Claims10
A power conversion system, comprising:
- one or more power conversion devices electrically coupled to a grid connection, wherein each of the power conversion devices comprises:
- a power converter for converting a first multiphase current provided by the grid connection into a second current;
- a grid side filter coupled between the grid connection and an input of the power converter, and comprising for each phase, a first inductor, a second inductor, and a first resistor having one end in series connection with one end of a first capacitor wherein the other end of the first resistor is connected directly to an output of the first inductor and an input of the second inductor, and the other end of the first capacitor is a neutral point of the grid side filter;
- a load side filter coupled to an output of the power converter wherein the load side filter, for each phase of the output of the power converter, includes a third inductor, a second resistor, a second capacitor;
- the third inductor is coupled between the respective phase of the output of the power converter and a respective phase of an input of the load;
- the second resistor having one end in series connection with one end of the second capacitor wherein the other end of the second resistor is coupled directly to an output of the third inductor and the respective phase of the input of the load, the other end of the second capacitor is a neutral point of the load side filter;
- a common mode filter coupled between the grid side filter and the input of the power converter;
- and
- the neutral points of the grid side filter and the load side filter being connected together to form a first node;
- wherein the first node being connected to ground via an impedance of an amount to limit fault current and the input of the power converter being connected to the grid connection without a transformer and the output of the power converter being connected to a load through a transformer.
7 more elements
A power conversion system, comprising:
- a power converter electrically coupled to a grid connection, wherein the power converter is configured to convert a first multiphase current provided at the grid connection into a second current;
- a grid side filter coupled between the grid connection and an input of the power converter, and comprising for each phase, a first inductor, a second inductor, and a first resistor having one end in series connection with one end of a first capacitor wherein the other end of the first resistor is connected between the first inductor and the second inductor, and the other end of the first capacitor is a neutral point of the grid side filter;
- a load side filter coupled to an output of the power converter wherein the load side filter, for each phase of the output of the power converter includes a third inductor, a second resistor, a second capacitor;
- the third inductor is coupled between the respective phase of the output of the power converter and a respective phase of an input of the load;
- the second resistor having one end in series connection with one end of the second capacitor wherein the other end of the second resistor is coupled between the third inductor and the respective phase of the input of the load, the other end of the second capacitor is a neutral point of the load side filter;
- a common mode filter coupled between the grid side filter and the power converter;
- and
- the neutral points of the grid side filter and the load side filter being connected together to form a first node;
- wherein the first node being connected to ground via an impedance of an amount to limit fault current and the input of the power converter being connected to the grid connection without a transformer and the output of the power converter being connected to a load through a transformer.
6 more elements
Dependencies are inferred from the claim text.