Power interchange system for interchanging electric energy between a battery and an electric grid, method for interchanging electric energy between a battery and an electric grid and application of the power interchange system
First Claim
1. A power interchange system for interchanging electric energy between a battery and an electric grid, the interchange system comprising:
- a rectifier unit for converting alternating current of the electric grid into direct current for charging the battery;
a grid measurement device for measuring an electric parameter of the electric grid;
a controller unit for adjusting the direct current for charging the battery as a function of the electric parameter of the electric grid, anda grid response controller which calculates active and/or reactive current or power reference set points during dips in the electric grid voltage,wherein the set points are calculated as a function of a predefined look up table for the relation between the electric grid voltage and the active and/or reactive current or a power flow between the rectifier unit and the electric grid when the electric grid voltage dips below a predetermined threshold level,wherein the set points are used to maintain operation of a battery charging unit in an inverter mode as a generating unit during the electric grid voltage dips,wherein the power interchange system is monitored and controlled from a remote location, andwherein inputs from a battery charging/discharging controller, the grid response controller, and a data communication link are processed in an order of priority by the controller unit in order to provide electric grid disturbance response as requested by the grid response controller, to provide protection of the battery as requested by the battery charging/discharging controller, and to control the battery charging/discharging.
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Abstract
A power interchange system for interchanging electric energy between a battery and an electric grid is provided The power interchange system includes a rectifier unit for converting alternating current of the electric grid into direct current for charging the battery; a grid measurement device for measuring an electric parameter of the electric grid, and a controller unit for adjusting the direct current for the charging the battery as a function of the electric parameter of the electric grid. Moreover a method for interchanging electric energy between a battery and an electric grid is provided.
60 Citations
19 Claims
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1. A power interchange system for interchanging electric energy between a battery and an electric grid, the interchange system comprising:
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a rectifier unit for converting alternating current of the electric grid into direct current for charging the battery; a grid measurement device for measuring an electric parameter of the electric grid; a controller unit for adjusting the direct current for charging the battery as a function of the electric parameter of the electric grid, and a grid response controller which calculates active and/or reactive current or power reference set points during dips in the electric grid voltage, wherein the set points are calculated as a function of a predefined look up table for the relation between the electric grid voltage and the active and/or reactive current or a power flow between the rectifier unit and the electric grid when the electric grid voltage dips below a predetermined threshold level, wherein the set points are used to maintain operation of a battery charging unit in an inverter mode as a generating unit during the electric grid voltage dips, wherein the power interchange system is monitored and controlled from a remote location, and wherein inputs from a battery charging/discharging controller, the grid response controller, and a data communication link are processed in an order of priority by the controller unit in order to provide electric grid disturbance response as requested by the grid response controller, to provide protection of the battery as requested by the battery charging/discharging controller, and to control the battery charging/discharging. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An arrangement of at least two of the power interchange systems,
wherein each power interchange system, comprises: -
a rectifier unit for converting alternating current of the electric grid into direct current for charging the battery, a grid measurement device for measuring an electric parameter of the electric grid, a controller unit for adjusting the direct current for the charging the battery as a function of the electric parameter of the electric grid, and a grid response controller which calculates active and/or reactive current or power reference set points during dips in the electric grid voltage, wherein the power interchange systems can be operated in parallel, wherein the set points are calculated as a function of a predefined look up table for the relation between the electric grid voltage and the active and/or reactive current or a power flow between the rectifier unit and the electric grid when the electric grid voltage dips below a predetermined threshold level, wherein the set points are used to maintain operation of a battery charging unit in an inverter mode as a generating unit during the electric grid voltage dips, wherein the power interchange systems are monitored and controlled from a remote location, and wherein inputs from a battery charging/discharging controller, the grid response controller, and a data communication link are processed in an order of priority by the controller unit in order to provide electric grid disturbance response as requested by the grid response controller, to provide protection of the battery as requested by the battery charging/discharging controller, and to control the battery charging/discharging. - View Dependent Claims (13, 14, 15, 16)
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17. A method for interchanging electric energy between a battery and an electric grid by operating a power interchange system, the method comprising:
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providing the power interchange system, the battery and an electric grid, wherein the battery and the electric grid are interconnected such that electric energy is interchanged between the battery and the electric grid; measuring an electric parameter of the electric grid using a grid measurement device of the power interchange system; adjusting direct current for charging the battery as a function of the electric parameter of the electric grid using a controller unit of the power interchange system, converting alternating current of the electric grid into the direct current for charging the battery using a rectifier unit of the power interchange system, charging the battery using the direct current, and calculating active and/or reactive current or power reference set points during dips in the electric grid voltage below a predetermined threshold level, wherein the set points are calculated as a function of a predefined look up table for the relation between the electric grid voltage and the active and/or reactive current or a power flow between the rectifier unit and the electric grid when the electric grid voltage dips below the predetermined threshold level, using the set points to maintain operation of a battery charging unit in an inverter mode as a generating unit during the electric grid voltage dips, wherein the power interchange system is monitored and controlled from a remote location, and processing inputs from a battery charging/discharging controller, the grid response controller, and a data communication link in an order of priority by the controller unit in order to provide electric grid disturbance response as requested by the grid response controller, to provide protection of the battery as requested by the battery charging/discharging controller, and to control the battery charging/discharging. - View Dependent Claims (18, 19)
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Specification