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Energy Group

Mission

We work towards realizing a sustainable society with blackout-free power system infrastructure, uninterrupted power supply harnessing renewable energy, and mobility powered by electric vehicles. Our research themes, therefore, are focused on the area of power system analysis for stability assessment, power electronics design and Electric Vehicle (EV) battery and its energy management system. We actively work with customers, such as power utility companies in both regional (ASEAN) and global markets.

Key research themes

In absence of wide area measurement and protection schemes, power grid faults and disturbances can result in wide area blackout. The current transmission systems operate with offline-System Protection Schemes (SPS), as the fault prevention requires real time control countermeasure. The protection setting in offline-SPS is often fixed and is based on local measurements. Therefore, it is difficult to ensure system stability as operating state of grid may vary significantly from the state assumed while in initial configuration.

Hitachi’s energy management system offers state-of-the-art differentiating feature of online-transient stability assessment and control, with a merit to address wide area grid stabilization by computing the stability needs and minimizing the blackout. To realize this, it is important to consider locations for critical faults/disturbances (e.g. transmission substation or line) and control countermeasure (e.g. generator stations). Therefore, before deploying an online SPS system, we must check the situation of power systems stability and the location of destabilizing faults and its counter-measure.

We have developed Hitachi Wide Area Stability Simulator (Hi-WASS) to visualize and customize the online-SPS system for target power utility. The below image shows a region of blackout with and without SIPS. For detailed viewing by operator, the generator rotor angle stability plots are shown on the right side.

Visualization of Hi-WASS tool

With use of renewable energies (solar, wind, etc.) in power generation and industry’s requirement to have a reliable, high quality uninterrupted power supply, the power electronics system market is rapidly growing, with focus on increasing equipment power output. From the power conversion technology perspective, to reduce component size and improve output efficiency, the switching frequency of semiconductor device is moving from kHz to MHz range.

With increased power handling capacity, voltage levels and increased switching frequency, the electromagnetic conducted and radiated noise may violate the compliance limits (IEC-61000). Therefore, we have created electromagnetic simulation platform to observe, model and simulate the conducted and radiated noise for given design specification. This simulation helps us to make suitable countermeasure at design phase to aid in electro-magnetic compliance.

EMC compliance study platform

x Electric Vehicle (xEV) Simulation Platform
Strict environmental regulations are compelling automotive manufacturers to adopt electrification of vehicles. To enhance our automotive electrification initiatives, we are developing an in-house simulation platform for complete xEV simulation. This xEV Platform includes Battery EV (BEV), Plug-in hybrid EV (PHEV), series hybrid EV (SHEV), etc. The dynamic simulator consists of physics based high frequency engine model, electric power train, thermal management systems, electronic actuators, engine control unit, vehicle control unit, etc. With features like high fidelity, performance, and accuracy, this platform enables design, analysis and optimization of Hitachi's several automotive products, such as Li-ion batteries, control units, electric motors and inverters.

Schematic diagram of xEV simulator