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Direct current (dc) load balancer

A DC load and load balancing technology, applied in AC network load balancing, load balancing in DC network, DC network circuit devices, etc., can solve problems such as fuel cell system degradation

Active Publication Date: 2022-02-11
FUELCELL ENERGY INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

If such a load is accidentally removed from the fuel cell system (e.g. grid outage), it can cause degradation of the fuel cell system in the form of thermomechanical stress

Method used

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  • Direct current (dc) load balancer
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Embodiment Construction

[0008] The lifetime of high temperature fuel cell systems (e.g., molten carbonate fuel cell systems or solid oxide fuel cell systems) is adversely affected by duty cycling, in which there is a sudden reduction (or complete disappearance) of the load extracting energy from the fuel cell system Can cause duty cycling. In particular, components of fuel cell systems are subjected to increased thermomechanical stress during load cycles. Unstable grid (i.e., load) conditions can lead to unexpected load cycles that can inadvertently trip the inverter connected to the fuel cell system.

[0009] One way to help reduce the impact of load cycling due to inverter tripping is to quickly reset the inverter, thereby removing most or all of the thermomechanical stress on the fuel cell system. Another way to help reduce the impact of load cycles in this case is to improve the reliability of the inverter and the grid disturbance ride-through capability. However, this solution is ineffective w...

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Abstract

A load balancing system includes a fuel cell inverter, a direct current (DC) load bank, and a controller. The fuel cell inverter is configured to receive DC power generated by the fuel cell assembly. A DC load bank is connected to the fuel cell assembly in parallel with the fuel cell inverter. The controller communicates with the fuel cell inverter and the DC load bank. The controller is configured to identify a decrease in load being drawn by the fuel cell inverter. In response to identifying the load decrease, the controller is further configured to divert DC power generated by the fuel cell assembly from the fuel cell inverter to the DC load bank to prevent duty cycling of the fuel cell assembly.

Description

[0001] Cross References to Related Applications [0002] This application claims priority to US Provisional Patent Application Serial No. 62 / 302,265, filed March 2, 2016, which is incorporated by reference in its entirety. Background technique [0003] A fuel cell is a device that converts chemical energy, such as energy stored in a hydrocarbon fuel, into electrical energy through an electrochemical reaction. Typically, a fuel cell includes an anode and a cathode separated by an electrolyte that conducts charged ions. High temperature fuel cells, such as molten carbonate fuel cells and solid oxide fuel cells, operate by passing oxidant gases (eg, carbon dioxide and oxygen) through the cathode while reactant fuel gas passes through the anode. To generate the required power levels, multiple individual fuel cells can be stacked in series. During operation, the fuel cell system can provide power to a load such as the grid. If such a load is accidentally removed from the fuel ce...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J1/14H01M8/04298H02J3/28H02J3/38H02J7/34
CPCH02J7/34H01M2008/147H01M8/04589H02J2300/30H02J3/381Y02E60/50H02J1/14H02J3/28H02J3/38
Inventor G·P·贝恩森L·维塔利斯
Owner FUELCELL ENERGY INC