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Nuevo sistema de conversión de potencia (PCS)


Oferta Tecnológica
Un centro portugués de I+D ha desarrollado un nuevo sistema de conversión de potencia que mantiene las ventajas de la tipología de un circuito conocido de un sistema de conversión de potencia y que a la vez no solo ofrece ventajas considerables cuando se utiliza como interfaz de una fuente DC sino también control de corriente de alta calidad, con control de factor de potencia, en un dispositivo de almacenamiento. El centro busca socios industriales interesados en continuar con el desarrollo de la aplicación y establecer acuerdos de licencia, investigación o joint venture.


New power conversion system (PCS) offered for licensing, research cooperation or joint venture agreement by Portuguese R-Y-D institution.
A Portuguese R-Y-D institution has developed a new power conversion system that preserves the advantages of a well-known circuit typology of a power conversion system while offering not only significant advantages when used as an interface with a DC source (e.g.battery pack) but also high-quality current control, with power factor control, on a storage device. Industrial partners interested in developing further the application via licensing, research or joint venture agreements are sought.
This invention provides a new power conversion system (PCS) whereby the advantages of a well-known circuit typology of a power conversion system are kept preserved while offering superior advantage when used as an interface with a DC source (e.g.battery pack) and providing high-quality current control, with power factor control, on a storage device. This is possible by using a novel method to control the circuit.

Possible application domains include: mobility (DC fast charger; on-board charger with "Vehicle-to-Grid" capability; the domestic energy market (distributed energy storage systems; DC microgrids); industry (energy supply in DC for electronic equipment - datacenters operated under the EMerge Alliance standard; battery chargers for industrial equipment; central bidirectional converter used to supply the DC bus of several variable frequency drives with regenerative braking functionality; solar or wind power inverters).

The invention provides a single-stage, bidirectional and high-frequency isolated power conversion system (PCS), including the control method to do the interface between the AC distribution network and a battery pack, or other DC sources/ loads. Moreover, the PCS output can also form a DC network for energy supply of several devices. The system converts three-phase AC power input from the network into DC power output that can be used, for example, to charge an energy storage device or supply a direct current distribution system. Since the PCS allows bidirectional power flow, it is also possible to convert DC power input from the energy storage device into AC power output to supply the network.

The main circuit comprises an input filter, a three-phase-to-single-phase matrix converter (MC), a high-frequency transformer (HFT), a full-bridge (FB) converter and an output filter. The MC is a core in this typology since it performs a direct AC to AC conversion between the grid and a high-frequency transformer. The FB regulates the voltage and current in the battery pack during the charge and discharge processes. The MC is an array of controlled four-quadrant power switches. The modulation used to generate the appropriate command signals for the power switches of the MC and the full-bridge allows simultaneously the power factor control in the grid interface and the current regulation in the battery pack. The MC is controlled by a novel space vector modulation that ensures higher power quality in the grid interconnection. A low current ripple in the energy storage device is guaranteed with this modulation, which results in a lower operating temperature that typically increases the battery life.

A three-phase-to-single-phase matrix converter and a full-bridge to do the interface of a DC source with the grid have been proposed before but these approaches focus on the operation as an inverter to supply the grid, using the converter as a voltage source in the grid side. Issues related with the DC source, that can be a storage unit, are not addressed. Other solutions propose the use of space vector modulation for the same conversion circuit but do not focus on the interface with the DC source, which is a requirement for energy storage applications. Moreover, the capability to control the power factor is not described. Using the three-phase-to-single-phase matrix converter as a current source in the grid side has also been proposed before, with modulations to control the power converter as a bidirectional unit. However, while these solutions allow the current regulation in the storage device, they do not allow the control of the power factor, keeping it near unitary. This new solution, on the other hand, addresses all these limitations.

The R-Y-D institution envisages cooperating with industrial partners interested in acquiring this technology by license or joint venture creation to develop it further for market uptake and with research partners for H2020 projects where the system can be used and scaled up.
Advantages and Innovations:
The proposed main circuit does not have a DC-link capacitor and features a high-frequency transformer, resulting in a more compact solution with a longer service life when compared with existing technical solutions with the same capabilities. Galvanic isolation and voltage level adaptation are provided by the transformer.

The new modulation allows the simultaneous control of the power factor in the grid interface and of the current in the battery pack, or in the formed DC network. Active power (P) and reactive power (Q) can be controlled to provide services for the grid operator or to comply with standards.

A higher power quality in the grid interconnection is also obtained due to the use of a new space vector modulation. The DC current has an accurate regulation and low ripple, making possible to supply sensitive loads such as an energy storage device or a DC distribution system.

The single-stage power conversion system, when compared with conventional solutions, has as advantages a higher power density, longer service life, higher power quality in the grid interconnection, power factor control capability and safe operation provided by galvanic isolation.
Stage of Development:
Under development/lab tested
Patent(s) applied for but not yet granted
CommeR Statunts Regarding IPR Status:
Patent applied for (PCT) but not yet granted.

Partner sought

Type and Role of Partner Sought:
The institution is looking for:
1) Industrial partners with know-how and experience in power electronics design and/or manufacturing, namely power conversion systems, interested in developing and exploiting the module by means of a license or joint venture agreement.
2) Research partners willing to engage in major H2020 R-Y-D consortia - via research cooperation agreements - under which the module can be used, developed and scaled up.


Type and Size of Client:
R&D Institution
Already Engaged in Trans-National Cooperation:
Languages Spoken:


Technology Keywords:
04002005 Generadores, motores eléctricos y conversores de potencia
04001003 Storage of electricity, batteries
04001004 Transmisión de electricidad