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DRP 7.0 Digital regulator for rectifier systems

The latest generation of FRIEM current-voltage digital regulator, suitable for each rectifier topology (bridge or double star) and technology (thyristors or diode with saturable reactors).

With the most recent electronic technologies the DRP 7.0 is a versatile, efficient and fast full digital regulator.

About DRP 7.0

FRIEM Industrial Design

The DRP 7.0 is designed for industrial applications and especially to satisfy the operation and protection requirements for the chemical and mining electrolysis industries beyond all applications requiring high direct current.

Dedicated to

Customers looking for a state-of-the-art technology for rectifiers regulation. Suitable for brand new rectifiers and retrofit of old units.

Easy to upgrade

Customers looking for a state-of-the-art technology for rectifiers regulation. Suitable for brand new rectifiers and retrofit of old units.

Flexible

The DRP 7.0 has a very flexible architecture in all its functions. It can be customized to fit the most demanding processes in terms of speed and stability of DC current and voltage, and fine-tuned during the lifecycle of the plants.

Innovative & intuitive

The DRP 7.0 has been designed by FRIEM’s R&D engineers to improve the overall functionalities of the rectifier.

Continuous improvement

The numbering 7.0 stands for the seventh FRIEM’s digital regulator and for the 70 years of the company activity. The numbering 7.0 stands for the seventh FRIEM’s digital regulator and for the 70 years of the company activity.

Slide 6 2005 DRP 6-T 1 1950 RA302 7 2020 DRP 7.0 2 1969 RA401 3 1975 510/3/6 4 1987 SRACT 909/6 5 2000 REGAS 2100

Lorenzo Carnelli (CEO FRIEM) presents the DRP 7.0

Improvements

A single control board manages bridge or double star converter topologies with thyristor or diode with saturable reactors.

Simple to be used and easy to set up,  with a dedicated HMI  graphic 4.3”  touch screen.

Thanks to a retrofit kit designed for a fast and simple replacement of the old regulator.

A dedicated SW tool (MS Windows platform) allows remote support, assistance and firmware upgrade.

All the measures can be easily shared over Ethernet/Internet, and stored for data visualization/analysis.

Cascade structure (Voltage/Current/Angle Loop) with reference/limitation signals always accessible and adjustable at runtime.

PLL algorithm for precise grid angle detection also in presence of voltage harmonics.

with instantaneous switch to a secondary feedback signal or trip with controlled angle ramp down.

New features to improve the performances of our rectifiers

  • To operate

    with latest generation of electrolysers in Chlor-Alkali and Hydrogen plants:

    - High stability and accuracy 0.1% full scale
    - High speed for polarization rectifiers

  • To revamp

    and upgrade high current rectifiers equipped with obsolete digital regulators:

    - Interchangeable with the previous digital regulators DRP-6T
    - Compatible with all other Brands of rectifiers

  • To satisfy

    the operation and protection requirements in metal refining and electrowinning plants

    - Fast reaction and response time 1/6 of the period
    - Different customizable functions and safety features

  • To comply

    with heavy industrial conditions typical of high current plants such as aluminium smelters, graphitization furnaces and DC arc furnaces:

    - Highest immunity against electromagnetic fields
    - Coating and finishing to protect the board from the surrounding corrosive and dusty environment

Comparison between technologies

DRP-6T

Response time

min 1 – max 2 periods

Phases regulation

Common for the three phases

Regulator accuracy

1% of full scale

Loop regulation

One closed loop current regulator. One closed loop voltage regulator

Reference Setpoint

DC Current setpoint. DC Voltage setpoint

DRP 7.0

Response time

1/6 of the period

Phases regulation

Independent for each phase

Regulator accuracy

0.1% of full scale

Loop regulation

Two independent closed loop current regulators and one closed loop voltage regulator, with angle limitation. Double star configuration managed by a single control board is possible.

Reference Setpoint

DC Current setpoint. DC Voltage setpoint. Firing angle setpoint

Improvement factor

Response time: 12x
Phases regulation: 3x
Regulator accuracy: 10x
Loop regulation: 3x

Download

FRIEM DRP 7.0 Digital Regulator

Current-voltage Digital Regulator

English – July 2021