Excitation control technology of frequency conversion AC power generation system for dual-winding induction generators for multi-electric auxiliary power units
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摘要:
当飞机主电源出现故障时，辅助动力装置（auxiliary power unit, APU）可作为备用电源代替故障的发电机供电。以多电辅助动力装置为背景，研究了一种双绕组感应发电机变频交流发电系统,并提出基于控制绕组磁链定向的变频交流励磁控制技术。该发电机定子上有两套绕组，一套为控制绕组，用于调节发电机励磁，一套为功率绕组，用于输出变频交流电能；两套绕组仅通过磁场耦合。采用控制绕组磁链定向对控制绕组电流进行解耦，将控制绕组电流分为无功电流和有功电流，在此基础上分别对功率绕组侧交流电压、控制绕组侧直流电压进行控制。实验结果显示，该系统在交流侧突增、突卸满载时，电压突变在±10 V以内，恢复时间不超过1.3 s。研究成果表明：采用该励磁控制技术能够使感应发电机平稳运行，且交流输出电压具有良好的稳态性能和动态性能。
Abstract:When the main power supply of the aircraft failed, the auxiliary power unit (APU) can be used as a backup power supply instead of the faulty generator. Taking the multi-electric auxiliary power device as the background, a double-winding induction generator variable frequency AC power generation system was studied, and a frequency conversion AC excitation control technology based on control winding flux orientation was proposed. The generator stator consisted of two sets of windings, one for the control winding, which was used to adjust the generator excitation, and the other for the power winding, which was used to output frequency conversion AC power. The two windings were coupled only by a magnetic field. The control winding current was decoupled by using the magnetic chain orientation, and the control winding current was divided into reactive current and active current, and on this basis, the power winding AC voltage and the control winding DC voltage were controlled respectively. The experimental results verified that when the AC side surged and offloaded abruptly, the voltage changed within ±10 V and the recovery time was not more than 1.3s. Research results showed that the excitation control technology can make the induction generator run smoothly, and AC output voltage has good steady and dynamic performance.
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图 4 基于控制绕组磁链定向的变频交流发电励磁控制系统框图
Figure 4. Block diagram of the excitation control system of the variable frequency AC power generation based on control winding flux orientation
图 12 采用所提控制技术的交流电压稳态实验结果
Figure 12. Steady-state experimental results of AC voltage using the proposed control strategy
图 13 采用所提控制技术的交流电压动态实验结果
Figure 13. Dynamic experimental results of AC voltage using the proposed control strategy
表 1 样机参数
Table 1. Prototype parameters
参数 数值 极对数 3 额定功率/（kVA） 15 额定转速/（r/min） 8000 交流额定电压有效值/V 115 直流母线额定电压/V 270 直流母线电容 CcDC/μF 4000 励磁电容 C/μF 40 滤波电感 L/mH 0.585 激磁电感 Lm/mH 1.058 控制绕组电阻 Rc/Ω 0.0332 控制绕组漏感 Lc/μH 66.4 功率绕组电阻 Rp/Ω 0.0237 功率绕组漏感 Lp/μH 66.4 转子等效绕组电阻 Rr/Ω 0.0304 绕组有效匝比（NP/Nc） 1.5 
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