-
利用Plecs仿真软件搭建悬浮拓扑结构模型,对其原理进行仿真验证[15]。仿真参数如表1所列。
C1, C2
/F负载电感
/mH负载电阻
/mΩ开关频率
/kHz电流峰值
/AUf_max
/V0.1 60 60 10 200 170 为验证算法原理的正确性以及可重复性,在放电阶段分别取悬浮模块放电比例系数
$k=0.4,\,0.5,\,0.6$ ,以3个脉冲周期波形进行仿真。悬浮模块的直流电容电压与电源输出电流仿真波形如图8所示。从图8中可以明显看出,在不同放电比例系数下,电源输出电流一致,悬浮模块电容电压在电源输出电流的上升段和平顶段下降,在下降段上升。对比不同放电比例系数下悬浮模块母线电压值,当放电比例系数越大,悬浮模块直流电容电压在放电段下降越多,但总会在反向充电阶段将电压充回初始值170 V,验证了控制策略的正确性。在3个脉冲电流周期内,其波形一致,重复性良好。
在不同放电比例下,主模块直流电容电压波形如图9所示。可以明显看出,在脉冲电流的下降段,不投入悬浮模块时主模块的直流电容电压会有50 V左右的起伏,原因是下降段负载馈能全部反馈到了主模块的直流侧,导致电容电压上升;而投入悬浮模块后主模块直流母线电压最大只有10 V左右的波动,有效地抑制了主模块的直流电压波动。
Design of Pulse Power Supply for Accelerator Based on Floating Topology
doi: 10.11804/NuclPhysRev.39.2022003
- Received Date: 2022-01-06
- Rev Recd Date: 2022-03-03
- Publish Date: 2022-12-20
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Key words:
- floating topology /
- pulse /
- power supply /
- accelerator /
- PI control
Abstract: With the development of accelerator technology, the working frequency and current rising rate of the pulse power supply of heavy ion accelerator are gradually increased. The magnet load of pulse power supply has the resistive characteristic, and it will absorb a large amount of reactive power in the rising section of current waveform, which will have a strong periodic impact on the power grid. At the same time, the high precision requirement of fast current rising rate poses new challenges to power supply design. In this paper, a suspension type H-bridge cascade topology based on capacitor energy storage is designed, which uses the energy storage capacitance and load inductance of the power supply to carry out reactive power interaction, and realizes the internal circulation of the reactive power, so as to reduce the impact on the power grid. At the same time, multilevel modulation and multiple frequency phase shift method is adopted to ensure the high precision demand under the fast dynamic response of power supply. The experimental results of the prototype verify the feasibility of the power supply topology and control principle, providing a new solution for the pulse power supply of accelerator based on fast current rising rate.
Citation: | Jingtao PU, Fengjun WU, Wanzeng SHEN, Xiaojun WANG, Yuan LI, Daqing GAO. Design of Pulse Power Supply for Accelerator Based on Floating Topology[J]. Nuclear Physics Review, 2022, 39(4): 463-469. doi: 10.11804/NuclPhysRev.39.2022003 |