| Summary: | 碩士 === 國立交通大學 === 機械工程系所 === 107 === This thesis proposes a new parallel control circuit scheme, which aims to solve the problem that the traditional parallel control circuit can not set the operating point of the input power. The control circuit adopts the traditional DC/DC converter and is matched with the proposed power feedback control method, stability controller design method, characteristic compensation controller design method and load distribution controller design method. With these methods to reach: (1) Plan the fuel cell's power output specification (2) The fuel cell's power output capability when the load is changed.
The simulation results indicate that when the default power of the specified fuel cell1 and cell2 is 1.2W and 0.8W under the condition of load power of 2W, the proposed parallel control circuit can control the output power of the fuel cell1 and cell2 at 1.2768W and 0.7801W, the errors are 6.4% and 2.48%. In addition, when the load power changes to 2.5W and the characteristic compensation controller is added, the ratio of the extra power of fuel cell1 and cell2 is expected to be 1:1 after load change, while the simulation result is 1:1.008 and the error is 0.8%.
The experimental results show that in the planning of fuel cell power output specifications. When the load power is 2W and the default power of fuel cell1 and cell2 is 1.2W and 0.8W, the proposed parallel control circuit can indeed control the output power of fuel cell1 and cell2 to 1.353W and 0.95W, with errors are 12.75% and 19%, respectively.
In the part where the load change amount is distributed to the fuel cell1 and cell2, the load power becomes 2.5 W, and the characteristic compensation controller is added, when the load change amount is designed to the ratio of the fuel cell1 and cell2 is 1:1. The experimental results indicate that the power the power allocation ratio is 1:1.034 to fuel cell 1 and 2 with an error is 3.42%.
From the simulation results and experimental results, the new parallel control circuit scheme proposed in this thesis can not only improve the operation point of the input power supply in the traditional parallel control circuit, but also plan the additional load power distribution to the parallel circuit architecture when the load changes.
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