Generator Controls

In the case of an electrical drive turbine the generator needs to be controlled and protected. Developments in microprocessor and electronic equipment enable more reliable and accurate devices to be fitted to provide these functions

Integrated Generator Control System

The TCL Development team have designed a new generator control system for the control and protection of electrical generators.

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Automatic Voltage Regulators (AVR)


Dual Channel AVR

There are a number of microprocessor based AVR's which provide an accurate setting of control parameters and faster control loops. Typically these employ an excitation current control loop which gives faster response time during system changes.

Automatic Voltage regulators (AVR) can be supplied and installed as a stand-alone controller or as part of a complete system retrofit. We have designed and supplied AVR equipment for gas and steam turbine electrical generators in simplex and duty/standby configuration. The supply would include:

  • Engineering analysis of the existing plant to select the most suitable and cost-effective hardware.
  • Design and integration of the hardware into the existing control system.
  • Configuration and testing of the hardware.
  • Installation and commissioning.

Generator Protection

Microprosser based generator protection equipment provides accurate and repeatable tripping functions that are less susceptible to spurious operation. This gives more stable system operation and fast and responsive reaction to a genuine fault condition. Supply and installation of Generator Protection equipment as stand-alone devices or as part of a complete retrofit system. We have designed and supplied Generator protection equipment for gas and steam turbine electrical generators. The supply would include:-

  • Engineering analysis of the existing plant to select the most suitable and cost-effective hardware.
  • Calculation of the protection settings to ensure stable operation.
  • Design and integration of the hardware with the existing sensors, VT’s, CT’s etc.
  • Configuration and testing of the hardware.
  • Installation and commissioning.
  • We have experience of most makes of generator protection equipment including Areva, GE Multilin and Siemens protection devices.

We also have the engineers and injection equipment to provide maintenance of existing protection devices can, including calibration and overhaul. This can be carried out at site or in our workshop.

Load control

Localised grid systems need to be protected from the effects of one or more generators tripping from the system. If no action is taken the system can suffer complete collapse if the other generators fail to pick up the load. Load control systems provide load shedding functions based on connected load and spinning reserve.

Small localised grid systems need to be protected from the effects of one or more generators tripping from the system. If no action is taken the system can suffer complete collapse if the other generators fail to pick up the load. We have installed load control systems on a number of Power Stations and offshore oil rigs to control system frequency and share load.

A load control system needs to know the individual loads connected and the maximum possible load generation. From this information a load shedding matrix can be developed to trip load from the system in the event of loss of generation. Load control can be programmed into the Turbine control system or supplied as a standalone system and typical functions include:

  • Load Shedding.
  • Calculation of spinning reserve.
  • Automatic start-up and shutdown of generators.
  • Frequency control.
  • Load sharing between generators.

Auto Synchronisers

Automatic synchronisers are used in generator applications which require automatic run-up and or remote operation. We have supplied and installed automatic synchronisers in many applications and can supply a standalone device or incorporate the necessary control functions within the control system.

We have developed a phase matching control algorithm which can be added to the control software of a PLC or DCS control system. The phase matching algorithms match the phase of the incoming and running voltages and issue a circuit breaker close signal. The phase matching control allows much faster synchronizing times which may be critical in emergency generator applications.