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Design Method of Energy-gaining Power Supply for Current Transformer Based on Self-adaptive Power Output Control
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Affiliation:

1.College of Electrical and Electronic Engineering, Shandong University of Technology, Zibo 255049, China;2.Shandong Kehui Power Automation Co., Ltd., Zibo 255087, China

Fund Project:

This work is supported by Shandong Provincial Key R&D Program of China (Public Welfare) (No. 2019GGX104025) and National Key R&D Program of China (No. 2016YFB0900600).

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    Abstract:

    The energy-gaining power supply of current transformer has the heating problem when the bus current is high, which affects the service life of power supply. For this reason, this paper proposes a design method of the energy-gaining power supply for the current transformer based on self-adaptive power output control. Based on the analysis of the power acquiring principle of current transformer, the load equivalent model of energy-gaining coil of the current transformer is established, and the relationship between the output power of the coil and the bus current is derived. By controlling the on-off state of the bidirectional thyristor, the purpose of controlling the power output of energy-gaining coil is achieved, and it is ensured that the power supply does not heat up at a large current. An implementation form of self-adaptive power output control circuit is given. By establishing its equivalent model, the relationship between the conduction angle and the bus current is derived. Finally, the experiment shows that the power prototype made according to the proposed design method can work in a low heat consumption state in a wide current range, which verifies the feasibility of the proposed method.

    表 1 不同母线电流下的导通角与实际输出功率Table 1 Conduction angle and actual output power with different bus currents
    图1 自适应控制原理简单示意图Fig.1 Simple schematic diagram of self-adaptive control principle
    图2 双向晶闸管及储能电容状态图Fig.2 State diagram of bidirectional thyristor and energy storage capacitor
    图3 自适应功率输出控制电路Fig.3 Control circuit of self-adaptive power output
    图4 自适应功率输出控制电路时序图Fig.4 Time sequence diagram for control circuit of self-adaptive power output
    图5 自适应功率输出控制等效电路Fig.5 Equivalent circuit of self-adaptive power output control
    图6 不同母线电流下的电压波形Fig.6 Voltage waveform with different bus currents
    图 带负载的取能线圈等效模型Fig. Equivalent model of the energy-carrying coil with load
    图 带负载的取能线圈等效电路Fig. Equivalent circuit of the energy-carrying coil with load
    图 带阻性负载的取能线圈模型矢量图Fig. Vector of draw-out power winding with resistive load
    图 电流互感器取能电源结构框图Fig. Block diagram of current transformer power supply
    图 试验测试平台Fig. Test platform
    图 不同母线电流时的电压波形图Fig. Voltage waveform with different bus currents
    图1 自适应控制原理简单示意图Fig.1 Simple schematic diagram of self-adaptive control principle
    图2 双向晶闸管及储能电容状态图Fig.2 State diagram of bidirectional thyristor and energy storage capacitor
    图3 自适应功率输出控制电路Fig.3 Control circuit of self-adaptive power output
    图4 自适应功率输出控制电路时序图Fig.4 Time sequence diagram for control circuit of self-adaptive power output
    图5 自适应功率输出控制等效电路Fig.5 Equivalent circuit of self-adaptive power output control
    图6 不同母线电流下的电压波形Fig.6 Voltage waveform with different bus currents
    图 带负载的取能线圈等效模型Fig. Equivalent model of the energy-carrying coil with load
    图 带负载的取能线圈等效电路Fig. Equivalent circuit of the energy-carrying coil with load
    图 带阻性负载的取能线圈模型矢量图Fig. Vector of draw-out power winding with resistive load
    图 电流互感器取能电源结构框图Fig. Block diagram of current transformer power supply
    图 试验测试平台Fig. Test platform
    图 不同母线电流时的电压波形图Fig. Voltage waveform with different bus currents
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Get Citation

ZHANG Peng,WANG Wei,XU Bingyin,et al.Design Method of Energy-gaining Power Supply for Current Transformer Based on Self-adaptive Power Output Control[J].Automation of Electric Power Systems,2020,44(3):194-200.DOI:10.7500/AEPS20190624006

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History
  • Received:June 24,2019
  • Revised:September 18,2019
  • Adopted:
  • Online: February 14,2020
  • Published: