Abstract
In this paper, aiming at the energy loss and harmonic problems in the conventional power accumulator battery pack testing system (PABPTS), an improved multi-functional energy recovery PABPTS (ERPABPTS) for electric vehicles (EVs) was proposed. The improved system has the functions of harmonic detection, suppression, reactive compensation and energy recovery. The ERPABPTS, which contains a bi-directional buck-boost direct current (DC)-DC converter and a bi-directional alternating current (AC)-DC converter with an inductor-capacitor-inductor (LCL) type filter interfacing to the AC-grid, is proposed. System configuration and operation principle of the combined system are discussed first, then, the reactive compensation and harmonic suppression controller under balanced grid-voltage condition are presented. Design of a fourth order band-pass Butterworth filter for current harmonic detection is put forward, and the reactive compensator design procedure considering the non-linear load is also illustrated. The proposed scheme is implemented in a 175-kW prototype in the laboratory. Simulation and experimental results show that the combined configuration can effectively realize energy recovery for high accuracy current test requirement, meanwhile, can effectively achieve reactive compensation and current harmonic suppression.
Highlights
IntroductionThe power accumulator battery pack testing system (PABPTS), which is used for evaluating the performance of high power density power accumulator battery packs (such as lead-acid battery, ultra-capacitor, lithium-ion battery, Fe battery, etc.), has been widely adopted in many battery companies
The power accumulator battery pack testing system (PABPTS), which is used for evaluating the performance of high power density power accumulator battery packs, has been widely adopted in many battery companies
A systematic design and control strategy for an energy recovery PABPTS using a two-level converter have been discussed in [2], compared with the small power output PAPBPTS in which the power transistors work in linear mode, the power transistors in the proposed power circuit work in switching mode, which has the merits of energy recovery and high power-output capability [2]
Summary
The power accumulator battery pack testing system (PABPTS), which is used for evaluating the performance of high power density power accumulator battery packs (such as lead-acid battery, ultra-capacitor, lithium-ion battery, Fe battery, etc.), has been widely adopted in many battery companies. When the EV is in climbing or in downhill running mode, braking kinetics could be controlled transferring to and from the power battery pack (PBP), the braking energy can be effectively recycled In this circumstance, the battery pack is frequently charged and discharged, and for this reason, the PABPTS is a high accuracy testing system which can be used to evaluate the characteristics and performance of the produced PBP. Operation Principle and Control Structure of ERPABPTS Including Non-Linear Load
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