DIGITAL LOAD CONTROLLER (DLC) FOR SYNCHRONOUS GENERATOR (ELC)

Electronics Load Control is an electronic governor that functions as a frequency and voltage regulator on a generator. Load control is suitable for a micro hydro power plant applied on rivers (with out a dam). There are some advantages of load control:

1. Avoiding expensive mechanical/electrical tools.
2. Load control tools are relatively more simple and cheaper.
3. Load control is possible to accept very big load changes. 4. Simple maintenance.

DLC DESCRIPTION:

ELC function as speed turbine regulator (governor) for power plan system by synchronous generator. While IGC function as voltage regulator (AVR) for power plan by asynchronous generator (IMAG). With balancing between turbine power (input power) with consumer load by balancing the number of power that thrown to ballast load. This ELC/IGC is the new generation where control system based on Micro-processor/ Microcontroller that able to control power plan with very high precision. By this system, generator frequency can be controlled easily and accurately. Though it is based on Microprocessor but the components of DLC are resist to the spike voltage / thunder. By this system the application of the installation and the commissioning will be simpler, because we don’t need any adjustment on the DLC. Frequency application nominal are 50 Hz or 60 Hz, depend on the setting of the switch. DLC storage on the box according to the capacity, completed by Circuit Breaker, contactor/ motorized circuit breaker and metering. For capacity under 35kW, the size of the box is 50cm wide, 70 cm height, and 25 cm thickness. For capacity from 40kW to 60kW the box size is 60 cm wide, 80 cm height, and 30 cm thickness. While for the capacity 70 to150 kW the box size is 70 cm wide, 120 height, and 50 cm thickness. The DLC can be applied for Mini Hydro Power (MHP) with off-grid / on-grid operation. DLC as turbine governor is operating simpler than flow control. DLC not use flow control and fly wheel to control the turbine speed during synchronizing. By added one unit synchronizer with the protection so the power plan can work Isolated or Parallel/ Interconnection ways.

ACCURATE FREQUENCY CONTROLLER

The accuracy of DLC for long term is 0.01 Hz. While for the short term, the changes of frequency to 100% load between 1 to 5 Hz is depend on the setup switch. The maximum return frequency time to the first position is 0.45 sec. The frequency will be maintain steady to maximum input power. When droop activated, frequency will increase equal with ballast power. METERING Volt meter, frequency meter, hour meter, ampere meter to each phase for consumer load, ampere meter for ballast load and lamp indicator.

PROTECTION

Over/Under frequency, Over/Under Voltage Protection, Over Load Protection, Main Load Short Circuit and Ballast Load Short Circuit.

DLC TECHNICAL SPECIFICATION

1. Phase : 3 Phase 4 wire / 1 Phase 2 wire
2. Voltage : 230/400 Volt / 277/480V
3. Nominal Frequency : 50 Hertz / 60 Hertz
4. Frequency deviation: 1 s/d 5 Hertz
5. Max time Constance : 0.45 second
6. Number ballast : 2 step (6 unit for 3 Phase)
7. Droop : 5 %
8. Capacity : 3 – 500 kW

INPUT ADDITIONAL

1. Analog Signal input (0.10Vdc) – setting frequency for synchronization process with grid ± 2 Hz from nominal frequency.
2. Digital input, enable external setting frequency – setting frequency from analog input for auto synchronizer.
3. Digital input, shift frequency reference 2Hz – switch off ballast load when Synchronic switch close for auto-synchronizer.
4. Digital input, enable DROOP.