An Energy-Efficient Motor Drive With Autonomous Power
Regenerative Control SystemBased on
Cascaded Multilevel Inverters and Segmented Energy Storage
IEEE
TRANSACTIONS
ON
INDUSTRY
APPLICATIONS,
VOL.
49,
NO.
1,
JANUARY/FEBRUARY
2013
Liming Liu, Senior Member, IEEE, Hui Li, Senior Member, IEEE, Seon-Hwan Hwang, Member, IEEE, and Jang-Mok Kim, Member, IEEE
研究生:吳叡霖
指導教授:龔應時
Outline
Abstract
Introduction
System Description
-cascaded-multilevel-inverter-based motor drive with segmented energy storage
-System Description
-Proposed Power Distribution Strategy and Operation-Mode Analysis and Energy Storage Design
-AUTONOMOUS POWER REGENERATIVE CONTROL SYSTEM
-PWM method with phase shift control for two auxiliary inverters in each phase
-Energy storage voltage balancing control
-Simulation results
-Experimental test bed
-Speed and capacitor voltages with voltage balancing control
-Speed and capacitor voltages without voltagebalancing control
Conculsion
References
Abstract

This paper presents a cascaded-multilevel-inverter-based motor drive system
with integrated segmented energy storage.

the energy storage features not only implementing the harmonic
compensation in all operating modes but also providing peak power during
acceleration and absorbing regenerative power during deceleration

An autonomous power regenerative control system including voltage
balancing control of segmented energy storage is developed to perform the
smooth power transition between different operation modes and provide
accurate speed tracking
Introduction

It is well known that energy storage devices are beneficial in a motor drive
system to improve efficiency since they can recover the regenerated energy
and provide peak power during transients.

Recently, cascaded multilevel inverters with single energy source and multiple
capacitors as energy storage for motor drive applications have been reported,
but capacitors in this research were only applied to provide harmonic
cancellation. The distribution of real power between the energy source and
the energy storage was not achieved, which limits the energy storage’s
functions.
cascaded-multilevel-inverter-based motor
drive with segmented energy storage
Proposed Power Distribution Strategy and
Operation-Mode Analysis and Energy Storage Design
3𝑛
2
2
𝑊𝑚𝑎𝑥 =
𝐶𝑈𝐶 𝑉𝐶,𝑚𝑎𝑥
− 𝑉𝐶,𝑚𝑖𝑛
2
1
𝑊𝑚𝑎𝑥 = 𝑃𝑚𝑎𝑥 𝑡𝑐
2
𝑃𝑚𝑎𝑥 𝑡𝑐
𝐶𝑈𝐶 =
2
2
3𝑛(𝑉𝑐,𝑚𝑎𝑥
− 𝑉𝐶,𝑚𝑖𝑛
)
AUTONOMOUS POWER REGENERATIVE
𝜋 𝑉
CONTROL SYSTEM
𝜃 = cos
∗
, 𝑖 = 𝑎, 𝑏, 𝑐
4 𝑉
𝑖
−1
𝑙𝑖_𝐹
𝑑𝑐𝑖
Energy storage voltage balancing control
1
𝑉𝑐 = (𝑉𝐶𝑎 + 𝑉𝐶𝑏 + 𝑉𝐶𝑐 )
3
1
𝑉𝑐𝑖 = 𝑉𝐶𝑖1 + 𝑉𝐶𝑖2 , 𝑖 = 𝑎, 𝑏, 𝑐
2
𝑉𝑐𝑖 = the individual capacitor voltage
𝑘5 =current gain
Simulation results
Experimental test bed
Speed and capacitor voltages with voltage
balancing control
Speed and capacitor voltages without voltage
balancing control
CONCLUSION

In the proposed motor drive system, the energy storage has been designed not
only to provide harmonic compensation but also to be capable of recovering
regenerative energy during the deceleration mode and reapplying this energy
during acceleration transients.

In this control system, the voltage balancing control of the energy storage has
been demonstrated to be vital for power distribution, system stability, and
reliability.
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𝑃𝑚𝑎𝑥 𝑡𝑐
Power Appl., vol. 151, no. 2, pp. 182–190, Mar. 2004.𝐶𝑈𝐶 =
2
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3𝑛(𝑉𝑐,𝑚𝑎𝑥 −𝑉𝐶,𝑚𝑖𝑛 )
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