Partnering opportunity

A new control method and improved topology of bi-directional DC-DC converter for energy recovery or storage

Summary

A Latvian research organization has developed power electronics converter that is tested on experimental prototype and is proposed to connect energy storage to 600 V DC bus. Converter can be used for various types of industrial equipment using motors to reuse braking energy or to supply energy during power failures. The organization seeks commercial agreement with technical assistance or technical cooperation agreement with companies in order to test prototype and commercialize technology.

Partner sought

The type of partner sought: Companies that manufacture equipment with DC-DC converters, industry interested to apply DC-DC converters. The tasks to be performed by the partner sought: depending on the interests of the partner different tasks can be performed - field tests in various applications, commercialization by implementing in saleable products, optimization of performance, application in their own machinery.

Description

In many applications the braking energy of electric motor still is wasted as a heat in a braking resistors – as example in more than 90 percent of installed elevators. By reuse of this energy the efficiency can be increased from 20…40%. The role of power electronics is becoming more and more important as energy conservation and saving are high priority issues in the industrial society. The research organisation from Latvia with expertise in power electronics has developed an innovative power electronics converter concept that is tested on experimental prototype and is proposed to connect energy storage to 600 V DC bus but also can be applied for other relevant applications. The control system of the converter is optimized to recover braking energy of electric motor drive system (elevator, electric transport or other driving mechanisms with a high inertia) by utilizing super capacitors or a Li-ion battery as an energy storage. The energy storage system can be also used to increase reliability of a drive system in critical applications where operation during short voltage outages or for safe stopping of the drive system is required. The bi-directional DC-DC converters is developed by incorporating new research results and new technologies such as improved inductors, new circuits and control algorithms. The research team have background on power electronics converter design, passive component optimization, control algorithm development and implementation by using microcontrollers. The 15 kW bi-directional non-insulated DC/DC converter experimental prototype has designed and tested. The currently implemented control system of the converter is optimized to recover braking energy of electric motor drive system powered from 3 phase AC network and controlled by variable frequency converter (elevator, electric transport or other driving mechanisms with a high inertia) by utilizing super capacitors or a Li-ion battery as an energy storage. The energy storage system can be also used to increase reliability of a drive system in critical applications where operation during short voltage outages or for safe stopping of the drive system. In particular the application is tested to repeatedly utilize the energy of passenger or freight elevator motor when it runs in braking mode. This energy is stored in energy storage and is utilized at next lifting cycle in that way reducing the total energy consumption. Bi-directional DC-DC converter controls the power flow to energy storage and from energy storage to elevator drive system. In braking energy application the converter has simple connection with 2 wires to manufacturer frequency converter DC link without modification or changing the elevator existing control system. The research organisation seeks commercial agreement with technical assistance or technical cooperation agreement with companies in order to test the device in various applications, optimize the performance and implement in a commercial products.

Advantages and innovations

The novelty of proposed bi-directional DC-DC converter is modular design and smart control algorithms that makes it possible to implement autonomous control system, the high power density and energy efficiency of the power electronic converter for relatively low costs. The converter has fast transient response for fast power changes. The converter has digital control system that allows to adjust converter for different applications such as DC micro grids, bi-directional electric vehicle charger, in a renewable energy generation systems and in many other applications. The proposed technology have following advantages: • reduced volume of device without significant increase of costs; • fast transient response; • digital control with possibility to develop various communication interfaces and easily change control algorithm; • developed control algorithm for braking energy recovery application; • modular design; • wide output voltage range.

Development stage

Prototype available for demonstration

Intellectual Property Rights (IPR)

Secret Know-how


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