GAS POWER GENERATION

Common controls and Displays

Display and PLC system of Jenbacher type 3, 4, 6 gas engines manufactured in

Austria

Main control display

Engine generator control panel – DIA.NE XT

Dimensions:

• Height: 2200 mm (87 in) [including 200 mm (8 in) pedestal

• Width: 800 mm (32 in)

• Depth: 600 mm (24 in)

External supply of control power from starter and control batteries.

Battery is rated at 24 V DC (tolerance: min. 22 V, max. 30 V, including waviness Upp max. 3.6 V)

Supply of power for auxiliaries from auxiliary power panel:

3 x 400/231 V, 50 Hz, 35 A

Consisting of:

DIA.NE XT (Dialog Network new generation) motor management system

System elements visualization with central engine and module control

a) Visualization:

Industrial control with 7¼“VGA TFT colors graphics display and 8 function keys.

10-key numeric keyboard for parameter input.

Keys for START, STOP, display selection and special functions.

Interfaces:

- Ethernet (twisted pair) for connection to DIA.NE WIN server

- CAN-Bus: bus connection to the intelligent sensors and actuators

- Power Link: bus connection to the control in- and outputs

Protection class DIA.NE XT front: IP 65

DIA.NE XT comprises the following units:

Engine control and visualization unit based on a panel controller

Decentralized I/O module for module control (Ethernet Power link)

Decentralized I/O module on the engine (Ethernet Power link)

Decentralized engine control/monitoring components (CAN bus)

Connection to DIA.NE WIN visualization unit on client PC (Ethernet)

Connection to higher-order control system (RS232 / RS485)

Data Communication

Dimensions: W x H x D = approx. 212 x 255 x 95 (8,4 x 10 x 3,75 in)

A clear and functional graphic compilation of measured values is displayed on the screen. User prompts are by means of direct-acting display selection keys and function keys.

Main displays:

Main display keys

Generator interconnection, with electrically measured variables and display of excitation voltage

Oil and engine cooling water circuits, with displays of oil pressure and temperature, and cooling

Water pressure and temperature.

Exhaust gas temperatures in a column graph which also displays the average temperature.

Main engine controller

Module auxiliary controller

Auxiliary systems (status display)

Operational data, i.e. operating hours, service hours, number of starts, active power demand (KWh), reactive power demand (kVArh) and measured values for operational logbook.

System display, i.e. time, password, brightness, contrast, diagnostics.

Recipe handling:

The average value of the individual power outputs of the engines is calculated and made available via the Equalizing line to the controller which uses it as a target value. During operation with an equalising line the power distribution is accurate and the power frequency is held exactly.
Power distribution using offset coefficient control: (dia.ne; SAM and other engine management systems):
A power distribution system that uses offset coefficient control lowers the desired engine speed as the power output increases. If every engine responds in the same way, then a stable operating point sets in at which all engines deliver the same power.

Setting, display and storage of all module parameters

Alarm management:

Efficient diagnostic instrumentation listing all active fault messages both tabular and

Chronologically, with the recorded time.

Control functions:

Speed control in no-load and isolated operation

After the engine has been started up, the electronic governor adjusts the engine speed to a designated setting. The actual engine speed is compared to the required engine speed, and is then matched to it by altering the setting of the throttle valve.

Speed control in no-load and isolated operation

Power output control in power mode operation system

In grid interconnection operation, the engine is controlled by an output regulator in order to strictly maintain the designated output. The current power output of the generator is compared to the designated power output, and is then matched accordingly by adjusting the throttle valve and the electrically operated valves in the mixture bypass system (turbocharger bypass).

The electrically operated valves in the turbocharger bypass system work together with the throttle valve to ensure an optimum level of control over the system.

Power output control in power mode

LEANOX Controller

LEANOX control system for control of boost pressure; dependent upon the generator terminal power and the mixture temperature via the engine-driven air-gas mixer

Display leanox controller

The operation of GE Jenbacher gas engines has been optimized to ensure that lowest exhaust emission values are achieved under full-load operation.

These optimized exhaust emissions can only be achieved by operating lean-mix engines with the correct air excess ratio (air ratio). This principle exploits the direct link between NOx-emissions and the air excess ratio to achieve minimum exhaust emissions values. The patented LEANOX control system is based on the linear relationship between the air excess ratio and the quantities power, boost pressure and air-gas mixture temperature. A control system based on these principles has the great advantage that all these quantities can be measured easily and reliably, and that the air ratio can be calculated exactly. No measuring probes that could be subjected to ageing are required in the exhaust system. In this way the emissions targets can be met reliably. The task of the LEANOX controller is to calculate and set the optimum boost pressure, based on the current power output and the current air-gas mixture temperature. The linear relationship between these quantities is calculated automatically by dia.ne (SAM) after two of the operating points have been stored to memory.

The LEANOX controller switches itself on automatically once the actual power output exceeds a threshold value (approx. 30% of the total power output). The program provides four sets of parameters for different types of fuel gas.

The LEANOX controller is always active during grid interconnection operation, but can also be switched on during isolated operation (depending on the system-specific design).

A PI-controller is used for the actual controlling. The actuator is a stepper motor, and it adjusts the gas aperture at the air-gas mixer to control the air ratio.

Leanox controller characteristic

Isolated Controller:

In isolated operation, a constant engine speed is required even when loads are switched on and off. This function is also carried out by the governor in a specific adaptation.

When several machine groups operate in parallel in an isolated grid (e.g. emergency power operation), then the required power output has to be distributed optimally in over the modules available.

There are two power distribution methods available which meet these requirements.

Display Isolated Controller

Power distribution via equalizing line

Power distribution

Anti-knock controller

This screen shows possible knocking in the engine. Depending on whether the engine is fitted with KLS98, KLS90 or GET, either a selective cylinder knock detection and control system or only a global detection system with global ignition point adjustment is supplied.

KLS98:

Each cylinder in the engine is fitted with a sensor. The signals are analysed at the engine and the values are transmitted to the control system via CAN-bus connection. The ignition point can be adjusted on selected cylinders.

The engine is fitted with two sensors which transmit the information to the control unit as an mA signal.

Display anti knock controller

Knock sensors (KLS90) or knocking intensity (GET)

If the KLS90 is fitted, the knocking signals from two sensors are displayed here. And, depending on the engine type (208), it is possible that only one knocking signal will be displayed.

If the mA signal of a knock sensor exceeds the pre-set threshold value, the signal from the engine control system is detected as actual knocking and the colour changes from green to red.

Ignition timing point

Display showing the nominal ignition point [Nominal] and the adjusted ignition point.

The maximum permissible adjustment is 100% of the bar.

Power reduction

Display showing the nominal power [Nominal] and the reduced power [Reduced].

Nominal power is represented by 100% of the bar.

Power controller

The power controller is active in mains-parallel mode and acts on the throttle valve and the turbo bypass. The controller parameters are also displayed. The controlled variables are available as a trend display.