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首页提升HEV电机系统效率:考虑电池电压波动的新型电流参考生成方法
提升HEV电机系统效率:考虑电池电压波动的新型电流参考生成方法
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本文献主要关注于直流母线电压波动对混合动力电动汽车(HEV)中永磁同步电机(IPMSM)系统效率的影响以及如何通过改进控制策略来应对这一挑战。IPMSM因其高效率和高扭矩/功率密度,被广泛应用于HEV中,特别是电动机的转矩由定子电流决定,因此定子电流控制对于扭矩控制至关重要。然而,电机可用扭矩不仅取决于定子电流,还受到电池电压(即逆变器的dc-link电压)和转速的影响。 作者Bumsik Kim、Mushin Kwak、Taehwan Chung、Youngkook Lee和Jinhwan Jung来自现代-起亚汽车公司,他们提出了一种新的电流参考生成方法,旨在提高系统效率并保持高控制精度,即使在电池电压波动的情况下。这种新方法特别设计用于处理电池电压变化对系统性能的影响,这对于HEV的稳定运行和整体效率提升具有重要意义。 论文的焦点在于电池电压波动的管理,因为这直接影响到电机的性能参数,如可用的电磁转矩和系统的能效。通过对现有电流控制策略的优化,研究者试图找到一个平衡点,既能确保电机在不同电池电压条件下仍能高效工作,又能在电机速度控制方面实现精确性。 关键词包括:电池电压变化、电流参考生成、混合电动车辆、永磁同步电机。实验结果被用来验证这个新方法的有效性和实际应用中的表现,这进一步证明了在HEV电机控制系统中考虑母线电压波动的重要性,并可能为行业内的其他工程师和研究人员提供有价值的参考依据。 这篇文献深入探讨了直流母线电压波动对IPMSM在HEV中的实际操作挑战,通过创新的解决方案,展示了如何在电池电压波动下提升电机系统效率,从而为HEV的持续优化和性能增强提供了关键见解。
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A Method for Improving HEV Motor System
Efficiency Considering Battery Voltage Variation
Bumsik Kim, Mushin Kwak, Taehwan Chung, Youngkook Lee, Jinhwan Jung
Hyundai-Kia Motors, 772-1, Jangduk-dong, Hwaseong-Si, Gyeonggi-Do, 445-706, Korea
Abstract –
Interior Permanent-magnet Synchronous
Motors (IPMSMs) are suitable for Hybrid Electric Vehicle
(HEV) due to their high efficiency and torque/power density.
Since the torque of a PMSM is determined by the stator
currents, stator current control is essential to the torque
control. Also, the available torque of a PMSM is dependent
on rotational speed and battery voltage (dc-link voltage of
the inverter). In this paper, a new current reference
generation method is proposed, which can improve the
system efficiency with high control accuracy even when the
battery voltage varies. The performance of the proposed
method is verified by experimental results.
Index Terms—Battery Voltage Variation, Current
Reference Generation, Hybrid Electic Vehicle, Permanent-
magnet Synchronous Motor.
I. I
NTRODUCTION
An electric machine converts electrical power into
mechanical force and motion. Electrical machines are
found in many applications including household
appliances such as fans, refrigerators, and washing
machines. Recently, to respond to urgent environmental
issues caused by exhaust emissions of automobiles, active
research and development on eco-friendly vehicles are in
progress. Therefore electric drives are also increasingly
used in electric vehicles(EV), fuel-cell electric
vehicles(FCEV) and hybrid-electric vehicles(HEV). Fig.
1. shows the appearance of “Hyundai YF Sonata HEV”.
The hybrid-electric vehicle is equipped with Parallel
Hybrid System(PHS) as shown in fig. 2.
Interior Permanent Magnetic Synchronous Motors
(IPMSMs) have been used in HEV because of their high
efficiency and high torque/power density. Normally An
IPMSM has different reluctance paths on d- and q- axes.
Fig. 1. Hyundai YF Sonata HEV.
Fig. 2. Parallel Hybrid System (PHS).
Specifically, L
q
>L
d
, where L
d
and L
q
are the inductances
on d- and q- axis inductances, respectively. Therefore,
IPMSM has a reluctance torque which is proportional to
the d- and q- axis current and inductance difference
besides electromagnetic torque.
When the rotational speed of the synchronous motor
using the permanent magnets as the field system is higher
than base rotational speed, current reference generator
computes a flux weakening reference current in
accordance with the battery voltage, reference torque and
rotational speed. An inverter performs the flux weakening
control of the synchronous motor using the permanent
magnets as the field system in accordance with the flux
weakening reference current sent from the current
reference generator to prevent the deterioration of
efficiency due to the excessive or insufficient flux
weakening current.
In this paper, a new current reference generation
method is proposed, which can improve the system
efficiency with high control accuracy even when the
battery voltage varies. The performance of the proposed
method was verified by experimental results.
Experiments were performed with the real HEV IPMSM
motor(16 pole, 208 Vdc, 205Nm).
II. M
ODELING OF IPMSM
A. The Voltage and Torque Equation of a IPMSM
As
widely known, the voltage and torque equations of
an IPMSM on the synchronous rotating reference frame
are expressed as
hV{
iG
lGTvGw
pGX
yG
iGzG
tG GXG
tG GYG
pG GYG
oznG
skj
8th International Conference on Power Electronics - ECCE Asia
May 30-June 3, 2011, The Shilla Jeju, Korea
978-1-61284-957-7/11/$26.00 ©2011 IEEE
[WeC1-2]
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