CRAFT超导磁体电源换流变压器短路阻抗设计

黄荣林; 傅鹏; 黄连生; 许留伟; 高格; 何诗英

doi:10.11884/HPLPB202133.210088

CRAFT超导磁体电源换流变压器短路阻抗设计

doi: 10.11884/HPLPB202133.210088

黄荣林^{1, 2,},
傅鹏^{1, 2},
黄连生^{1, 2, ,},
许留伟^{1, 2},
高格^{1, 2},
何诗英¹

1.
中国科学院等离子体物理研究所，合肥 230031
2.
中国科学技术大学，合肥 230036

基金项目: 聚变堆主机关键系统综合研究设施项目（2018-000052-73-01-001228）

详细信息

作者简介:
黄荣林，hronglin@163.com

通讯作者:
黄连生，huangls@ipp.ac.cn

中图分类号: TL6
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- 被引次数: 0
出版历程
- 收稿日期: 2021-03-17
- 修回日期: 2021-07-24
- 网络出版日期: 2021-08-19
- 刊出日期: 2021-09-15

Short-circuit impedance design for converter transformer of superconducting magnet power supply for CRAFT

Huang Ronglin^{1, 2
,},
Fu Peng^{1, 2},
Huang Liansheng^{1, 2
, ,},
Xu Liuwei^{1, 2},
Gao Ge^{1, 2},
He Shiying¹

1.
Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, China
2.
University of Science and Technology of China, Hefei 230026, China

摘要

摘要: 聚变堆主机关键系统综合研究设施（CRAFT）超导磁体电源兼具大电流稳态运行、高功率脉冲运行和瞬态故障抑制能力的需求。换流变压器的短路阻抗与超导磁体电源的特性密切相关。为了优化超导磁体电源的性能，基于交直流系统的参数和换流变压器的等效电路模型，研究了换流变压器短路阻抗与超导磁体电源的输出电压、谐波电流、短路故障电流和无功损耗的关系。短路阻抗越小，超导磁体电源的额定输出电压越高，无功损耗越小，这些特性对CRAFT超导磁体电源的性能有利，但是短路故障电流和谐波电流增加，影响电源的短路故障抑制能力和谐波特性。在CRAFT超导磁体电源换流变压器短路阻抗设计时，首先短路阻抗必须满足直流电源的额定输出电压和故障电流抑制能力，其次，由于CRAFT超导磁体电源是多相变流器，仅产生高次特征谐波电流，含量少便于抑制，因而尽量选择较小的短路阻抗。
- 聚变堆主机关键系统综合研究设施 /
- 电源 /
- 短路阻抗 /
- 谐波电流 /
- 无功功率
Abstract: The superconducting magnet power supply for the Comprehensive Research Facility for Fusion Technology (CRAFT) has the abilities of large current steady-state operation, high power pulse operation and transient fault suppression, which is closely related to the short circuit impedance of converter transformer. On the basis of parameters of AC system and equivalent circuit model of converter transformer, the relationship between the performance of superconducting magnet power supply and the short circuit impedance of converter transformer is studied. The research shows that the small short circuit impedance is beneficial to the output voltage and the reactive power loss of superconducting magnet power supply, but the short-circuit fault current and harmonic current increase accordingly. For short-circuit impedance design for converter transformer purposes, firstly, short-circuit impedance must satisfy the transient fault suppression capability and the rated output voltage, and secondly, it is easy to suppress the high characteristic harmonic current brought by thyristor multi-phase converter for CRAFT, hence small short-circuit impedance should be chosen.
- CRAFT /
- power supply /
- short-circuit impedance /
- harmonic current /
- reactive power

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图 1 超导磁体电源系统图

Figure 1. Simplified diagram of power supply system

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图 2 三相桥变流器触发角α时阀侧交流电流波形

Figure 2. Phase current waveform of valve-side of converter transformer with the firing angle α

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图 3 三变流器同步相移计算等效电路

Figure 3. Equivalent circuit of synchronous phase shifting for converter

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图 4 变流系统相量关系图

Figure 4. Phasor diagram of converter system

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图 5 变流器最高输出电压V_dmax与短路阻抗u_k的关系

Figure 5. Relation between maximum output voltage V_dmax and short circuit impedance u_k of transform

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图 6 V₅向V₁换相的等效电路

Figure 6. Equivalent circuit of transferring from V₅ to V₁

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图 7 三相桥变流器交流侧A相电流波形

Figure 7. A-phase current waveform of three phase bridge converter

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图 8 谐波电流百分比与变压器短路阻抗u_k的关系曲线

Figure 8. Relation between harmonic current and short circuit impedance u_k of transform

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图 9 变流器短路故障示意图

Figure 9. Short-circuit fault diagram of converter

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图 10 变流器电源消耗的无功功率Q_S和功率因数PF与u_k关系曲线

Figure 10. Relationship curve between Q_S, PF and u_k

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表 1 超导磁体电源系统基本参数和性能指标

Table 1. Design parameters and performance of the power supply

rated voltage/V	rated power/MW	rated voltage/kV	rated current/kA	maximum output pulse current/kA	pulse width/ms
250	30	0.25	120	400	200

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表 2 主要设备的电气参数

Table 2. Electrical parameters of main equipments

parameter	rated voltage/kV	short-circuit capacity/MVA	rated power/MW	transformer ratio	short-circuit impedance	load loss/ kW	resistance/ mΩ	inductance/ mΩ
power grid	110	1270	−	−	−	−	−	−
step-down transformer	−	−	63	110/35	10.5%	232	−	−
power cable	−	−	−	−	−	−	239.4	110.6
converter transformer	−	−	8	35/0.197	−	46	−	−
AC busbar	−	−	−	−	−	−	−	0.314

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表 3 主要设备的等效阻抗

Table 3. Equivalent impedance of main equipments

parameters	equivalent reactance/μΩ	equivalent resistance/μΩ
power grid	30.6	3.1
step-down transformer	65	2.3
power cable	3.5	7.6
converter transformer	−	27.9
AC busbar	314	0

下载: 导出CSV

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