Starter/Helper System

Variable speed drive system for LNG process optimization

Overview

Electrification offers variable speed drive systems specifically developed for LNG applications.

In starter/helper configuration, the motor can operate under 3 different modes:

Starter: allows a smooth starting of the compressor
Helper: provides additional power to the gas turbine if required, for example when the turbine output power is limited during summer, then maximizing the operating efficiency of the compressor
Generator: regenerates the excess of power during winter and sends it back to the grid

The use of electric motors to start or help the main turbine power supply allows the gas turbine to always perform at its optimal operating point. This in turn allows for optimal energy balance, continuous operation and stability of the whole system in possibly any situation.

Starter/Helper system

FEATURES

Direct drive (2 poles, synchronous or induction)
3,000 rpm or 3,600 rpm depending on turbine speed
Suitable for double shaft end in VSI + induction motor configuration

POWER CAPACITY

Up to 47 MW with a single VSI drive panel
Up to and 13,8 kV output motor voltage
N+1 power cells redundancy

AVAILABLE TOPOLOGIES

Diode Front End except for generators mode
Active Front End with reactive power generation & power factor control up to unit
Transformer-less up to 13,8 kV for footprint, reliability and efficiency optimization and improved grid quality

We propose the complete system engineering including grid harmonics study and mechanical shaft analysis

Benefits

High efficiency: 95%+
Full flexibility available in terms of power demand
Very high starting and operating reliability and availability: starting time <1 min
Emission-free solutions/Fit with environmental restrictions