Turbine Diagnostic Services, Inc.

The TurboNet DASH 1 is suitable for a variety of gas turbine control system retrofits. The following is a list of features that apply to gas turbine control retrofits.

	Existing Instrumentation - In most cases, the existing instrumentation on the turbine can be reused. No expensive electric valve upgrades since the system accepts OEM supplied LVDT's, flow divider pickups and servos. TDS can retain any level of redundancy in the instrumentation supplied by the OEM including LVDT, servo coils and magnetic pickup inputs.
	Flame Scanner Upgrade - Existing UV (Honeywell type) sensors are expensive and require a specialty interface. TDS can upgrade the flame scanner system to a third party supplied system to enhance the reliability of the gas turbine.
	Temperature Control - TDS has implemented standard isothermal exhaust temperature control as well as biased temperature control. Biases include water flow, compressor discharge pressure (CPD), compressor pressure ratio (CPR), ambient temperature, compressor discharge temperature, air humidity, load and fuel demand. The application will determine which biases apply to the turbine. As an option, the customer can specify the exhaust thermocouples be divided over three thermocouple modules so that the failure of one module will have reduced effect on exhaust temperature control.
	Load Control - TDS has implemented algorithms to control load at a pre-selected setpoint.
	Speed Control - TDS has implemented a proportional speed droop controller as required by IEEE standards. Isochronous speed control, although not as popular on gas turbines, can also be supplied. On DLN machines where due to the non-linearities introduced by multi-valved systems the droop may not be in accordance with IEEE specifications, closed loop megawatt droop control is used when online.
	Acceleration Control - TDS has implemented an acceleration controller for gas turbines. This ensures that startup of the machine occurs in a controlled and predictable way. The acceleration setpoint is adjusted during startup to stay within the capabilities of the machine.
	Surge Control (Stall) - TDS has implemented control algorithms that will control bleed heat, IGV's and fuel in order to control compressor surging. This type of control is only applicable to larger frame machines.
	Inlet Bleed Heat - TDS has implemented control algorithms that will control inlet bleed heat in the same way as the OEM. This includes open loop controllers (old style manifold) and closed loop control (new style manifold).
	IGV Temperature Control - TDS has implemented control algorithms that can modulate hydraulic IGV's in order to maintain exhaust temperature control as high as possible. On combined cycle machines, this provides a boost in efficiency. On DLN machines, this is required to enable the machine to operate in low emissions (Pre-Mix Steady State or PM6) mode in as low a load as possible.
	IGV Temperature Matching - TDS has implemented algorithms necessary to control exhaust temperature to an external temperature setpoint. This will in turn allow the exhaust temperature to be controlled to match the steam outlet temperature to the steam turbine chest temperature. This allows for minimized stresses in the boiler and steam turbine as well as faster startups.
	Combustion Monitor - TDS has implemented control algorithms that will monitor the condition of the combustion system. This combustion monitor system is bypassed during startup to allow for transients. The algorithms calculate a temperature spread from the available thermocouples. This spread indicates the condition of the combustion system.
	Water Injection Control - The control system is fully capable of controlling one and two stage water injection systems. This can be used for Nox Control or Power Augmentation. The control system can control the flow by modulating control valves or by modulating the speed of the variable frequency drive controlling the water pump motor. All protection would be implemented per OEM standards.
	Steam Injection Control - The control system is capable of controlling steam flow into the turbine for either Nox control or power augmentation. The control system can also monitor steam flow by using steam temperature and pressure and orifice differential pressure to calculate it.
	Two Shaft Machine Support - The control system has support built in for two shaft machines. Each shaft has three speed probes installed for overspeed protection and control.
	Auxiliary Controls - TDS has built the logic necessary to control the auxiliaries on frame machines.
	Fuel Control - The control system can control any type combustion system from standard diffusion to all the DLN systems (DLNI, DLN-II, & DLN 2.6).
	Auxiliary Controls - The control system is fully capable of controlling all the auxiliaries on the turbine such as cranking motors, torque converters, ratchets, etc.
	Excitation System Interface - The control system can be interfaced to a TDS provided exciter retrofit to form one complete package. All the relevant exciter data can be displayed and trended on the display in the control system. The control of the exciter can still be performed by discrete contact inputs and outputs.
	Generator Protection System Interface - The control system can be interfaced to a generator protection relay in order to bring in all the relay flags. This assists operators and engineers in understanding the cause of a generator trip.