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Frequency Regulation Strategy for AC–DC System During Black Start
Chengjun Xia,Jiazheng Xie,Haiwen Lan,Baorong Zhou,Zhaobin Du 대한전기학회 2020 Journal of Electrical Engineering & Technology Vol.15 No.1
High-voltage direct current (HVDC) can speed up the recovery of a power system. However, both rectifer and inverter sides of HVDC are weak systems during a black start. To coordinate frequency characteristics of both sides within the frequency deviation constrain, a frequency regulation strategy for AC–DC system during a black start is proposed. First, the mathematical models of asynchronous interconnected AC–DC system are established, and the optimal HVDC transmission power leading to minimum frequency deviation of both sides is obtained based on the linear quadratic optimal control method. To adapt to the continuously changing parameters and confgurations of the AC power system during a black start, a Narendra adaptive tracking control method is developed to obtain the control law of the target value of governor, which allows the actual system frequency follow the reference system frequency under the optimal HVDC transmission power. Finally, the simulation model is established using PSCAD/EMTDC software to verify the proposed strategy
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A Novel Double Layer Cantilevers Harvester for Vibration Energy
Chen Xiaojie,Qiu Chengjun,Qu Wei,Liu Yibo,Xia Hongyang 보안공학연구지원센터 2015 International Journal of u- and e- Service, Scienc Vol.8 No.8
This paper reported a double layer cantilever harvester powered for vibration energy. A space layer between the PZT beam and the support silicon beam is existed, leading to the double layer cantilever structure. Such structure can allow the more strain generated by the piezoelectric layer due to the existing of space layer, and the output voltage is further increased. The formula of output voltage is then derived from the piezoelectric effect equation and vibration model. And the formula verifies the relationship of voltage and structure parameter. And the simulation in micrometer lever is used to discuss the relationship. Finally, the prototype is assembled and measured to verify the feature of the device. Experimentally, the 3.8V output voltage and 16.9uW output power is acquired.
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