Design of Control System for Small Scale Condensing Type Geothermal Power Plant

1
Design of Control System for Small Scale
Condensing Type Geothermal Power Plant 

• Riza, Nugroho Adi Sasongko, Anton Rahmawan, Teddy
  Lubis,
• Tsani Hendro, Suyanto, Taufan Surana
• The Agency for The Assessment and Application of
  Technology
• (BPPT)riza68_at_webmail.bppt.go.id

2
Outline

• Background
• Objective
• Desain of Small Scale Geothermal Power Plant
• Basic parameter for design
• Control System Configuration
• SCADA system
• Steam Turbine and Generator
• Conclusion

3
Background

• Utilization of geothermal potential of
  small-scale (low-medium enthalpy) in Indonesia is
  necessary and urgent to do
• Accelerated development program has set a 10,000
  MW power plant to the stage-1 which is the
  contribution of geothermal power plants is 3967
  MW
• To achieve the target, utilization of the
  small-scale geothermal potential resources is
  very necessary

4
Objective

• To develop the control systems for small scale
  condensing type 3 MW geothermal power plant.

5
Basic Parameter Characteristics
6
Process Flow Diagram
7
Control System Configuration

• Redundant CPU
• Number of I/O approx. 400 I/Os
• Field Instrument connected to PLC via junction
  box

8
Instrumentation

• Control Valve (10 units, Modulated on-off type)
• Flow Meter (5 units)
• Level Sensor (5 units)
• Pressure Transmitter (20 Units)
• Differential Pressure Transmitter (3 units)
• Pressure Switch (4 units
• Temperature Transmitter (32 units)
• Speed Sensor (3 units)

9
Control System Configuration
10
Turbine Control

• Woodward Speed Control 2301D-ST
• Governor Hydraulic Amplifier (Woodward 89007)
  collaborated with Control Valve
• Speed Sensor (3 units)
• To Local Panel
• To SCADA
• To PLC

11
SCADA System

• 24 pages SCADA
• Overview
• Well
• Separator
• Condenser
• Steam ejector
• Cooling system
• Reinjection system
• Raw water

• Fire water system
• Chemical Dosing
• Steam Turbine
• Generator
• Alarm list
• Trending
• Plant Performance Indicator

12
SCADA SystemOverall System
13
SCADA SystemCooling Tower
14
SCADA SystemTurbine Condenser
15
Steam Turbine and Generator
3MW Generator
Turbine
Gearbox
Oil Cooler
Skid
16
Steam Turbine and Generator Data
17
Overall Single Line Diagram

• Inter-connected with 20 kV distribution system
• 2 auxiliary feeders
• Essential load
• Non Essential load
• All of CB status will be monitored

Auxiliary Transformer
Step up transformer
3MW Generator
Auxiliary Load
18
Current Development Status

• Generator
• Turbine
• STG Skid Gearbox

19
Conclusion

• Small Scale Geothermal Power Plant is very
  important for the development of renewable energy
  in indonesia, especially in the eastern part
  since there are a lot of potential geothermal
  sources to replace the diesel generator.
• Control system for the 3 MW condensing type
  geothermal power plant has been developed.
• The proposed control system has number of
  instruments (PT, TT and FT) bigger than the
  conventional system at the same capacity because
  of the neccesity of more detail acquisition data
  for analysis and research purposes.
• Step by step partial testing such as data
  connection test, point to point testing and loop
  tes have already done and confirmed. The SSGPS is
  under construction and will be in operation by
  the end of this year.

20
Thank You

• Illustration of 3 MW Small Scale Condensing Type
  Geothermal Power Plant