Abstract
The main objective of the present work is to apply a sliding mode controller (SMC) to medium voltage and high power output energy recovery Li-ion power accumulator battery pack testing systems (ERLPABTSs), which are composed of a three-level neutral-point-clamped (NPC) three-phase voltage source inverter (VSI) and a two-level buck-boost converter without an isolating transformer. An inner current decoupled control scheme for the aforementioned system is proposed and two sliding mode planes for active and reactive current control are designed based on the control scheme. An optimized switching table for current convergence is used according to the error sign of the equivalent input voltage and feedback voltage. The proposed ERLPABTS could be used to integrate discharging energy into the power grid when performing high accuracy current testing. The active and reactive power references for the grid-connected inverter are determined based on the discharging energy from the DC-DC converter. Simulations and experiments on a laboratory hardware platform using a 175 kW insulated gate bipolar transistor (IGBT)-based ERLPABTS have been implemented and verified, and the performance is found satisfactory and superior to conventional ERLPABPTS.
Highlights
Energy has become one of the most important parts of our lives and, due to its widespread use and effects, there is a need to create methods of conserving it, to prevent further air pollution.Many countries have invested heavily in developing electric vehicles (EVs), which usually contain three parts: a driving motor, a power transmission system, and a power supply system
The power battery pack testing system is used to evaluate the performance of power accumulator batteries, and it plays an important role in choosing and comparing batteries for EVs
A bi-directional energy flow power circuit topology combined with the control scheme used for power accumulator battery pack testing system (PABPTS) was designed to reduce the energy required for discharge test experiments and was described in [11]
Summary
Many countries have invested heavily in developing electric vehicles (EVs), which usually contain three parts: a driving motor, a power transmission system, and a power supply system. A bi-directional energy flow power circuit topology combined with the control scheme used for power accumulator battery pack testing system (PABPTS) was designed to reduce the energy required for discharge test experiments and was described in [11]. This technology can integrate discharging energy of Li-ion battery with the power grid, and is called an energy recovery power accumulator battery pack testing system (ERPABPTS)
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