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Industrial Solar Power Plants

HYBRID POWER CONDITIONER

The 3 phase, DSP based Hybrid Power Conditioner (HPC) system can be configured in one of two source modes: Dual Source mode or Parallel Source mode.

The Dual Source mode can have one or two gensets, whilst the Parallel Source mode utilises two gensets with each having their own syncronisers and load sharing modules.

In Dual Source mode, there can be a maximum of two gensets available where only one genset is online at a time. In this mode, two configuration options are available to the user: Back-up configuration or Equal Run-Hour configuration.

The Back-Up configuration is typically used where a new genset and an old genset are available. The new genset is used as then primary source of power when a genset is called to start and run. If the new genset faults it will be masked from operation and the back-up genset used in its place

In the Equal Run-Hour configuration, both gensets are typically of equal age (run hours) and operation is swapped between each other to achieve an equal number of run hours. This will allow periodic maintenance to be carried out on both gensets at approximately the same time.

If the battery bank is suitably charged and the site load is sufficiently small as to meet the stop conditions for the genset, the system controller will shutdown the genset source and operate in a Fully Auto- Inverter Only Mode. The inverter module will continue to provide power to the site by using battery power and any available renewable energy.

As the kVA loading on the inverter module starts to increase beyond a certain limit, or the battery's state-of-charge (SOC) drops to a pre-defined low limit, a genset will be automatically started, brought up to its rated speed/voltage, then connected in parallel with the inverter module. The genset will then supply the load and also provide power to charge the batteries provided the site load was not too high.

An extension to the Dual Source mode is the Parallel Source mode configuration. In this case, one or two gensets can be online at the same time to provide the necessary genset capacity to meet the load demand and charge the battery bank. This configuration will require the gensets be interfaced with a Multi Genset Control System (MGCS) that will handle all the syncronisation and load sharing aspects between the two gensets.

In the Fully-Auto mode, the HPC controller determines when to start and stop the individual gensets based on various factors including the site load demand and state of charge of the batteries.

Similar to the Dual Source mode, if the site load is sufficiently small and all the genset stop conditions are met, the system controller will shutdown the last genset online and operate in a Fully Auto-Inverter Only Mode. The inverter module will continue to provide the power to the site by using battery power and any available renewable energy.

As the loading on the inverter module starts to increase beyond a certain limit, or the battery's state-of-charge (SOC) is depleted to a pre-defined low limit, the smallest genset will be automatically started, brought up to rated speed and connected in parallel with the inverter module. If both gensets are the same size, the genset with the fewest run hours will be brought online first. The genset will then supply the load and provide power to charge the batteries provided the site load is not too high.

As the load continues to rise, the second genset will be started and brought up to rated speed/voltage and connected in parallel with the online genset and inverter module. The Smallest genset will then go through its cool down phase and then be switched off. Finally, the smallest genset will be brought online in parallel with the online resources as the loading on the operating genset exceeds a defined limit. This configuration provides the optimum spinning capacity to supply the load and charge the batteries.

Conversely, as the loading on the parallel gensets decreases below a pre-defined limit, the smallest genset is switched off and the largest genset will continue to supply the load. As the loading drops further, the smallest genset is brought back online in parallel with the online resources and the largest genset is then switched off. Finally, then smallest genset is switched off when the loading on the genset is below a defined limit and the system will continue in a Fully Auto-Inverter Only Mode.

  • 3 Phase DSP based design
  • Bi-Directional Inverter / Charger
  • Diesel Management Control
  • Battery Management Control
  • Local and Remote Monitoring

HYBRID POWER CONDITIONER
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GRID SUPPORT CONDITIONER

The 3 phase, DSP based Grid Supply Conditioner (GSC) system incorporates an utility supply connection and can also include a backup genset option if required. These two sources will never be online and suppling power at the same time.

It behaves as a single conversion, on line UPS whose output voltage is regulated to within 1% of its nominal value. The inverter module operates in parallel with the utility supply with the active power to the load being supplied by the utility or the inverter module depending on the availability of renewable resources. The voltage to the load is conditioned by virtue that the inverter is directly connected to the load at all times and its output voltage is fixed.

The GSC system can operate in a variety of modes, all under software control. The inverter module can support high peak, short duration loads while the online source (utility or genset) maintains the base load provided it is within its voltage and frequency limits.

If the utility supply was lost or move out of its preset voltage or frequency range, it will be taken off line and the inverter module will continue supply to the load with no break in supply. Energy from the load will come from the battery bank and any available renewable source connected to the DC link.

If the utility supply was lost for more than a pre-determined period and provided a backup diesel generator was available, it will be started and brought on line parallel with the inverter module as to supply the load and charge the battery bank.

GRID SUPPORT CONDITIONER
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GRID EXPORT CONDITIONER
Model:GEC-10K(3 phase)

THEORY OF OPERATION

The three phase DSP based, Grid Export Conditioner (GEC) is designed to operate as a power conditioning unit capable of exporting all available solar power to an utility grid supply. A fast and efficient MPPT extracts the maximum available power from the solar array and exports it to the grid.

BASIC SYSTEM OPERATION :
FULL AUTO MODE
  • The system automatically wakes up in the morning and exports power provided there is sufficient solar energy and the grid voltage and frequency are in range
  • If the grid voltage and / or frequency goes out of a preset range the inverter is immediately disconnected from the grid. The inverter will reconnect after a pre determined time when the grid is back in range
  • When the exported power is below a low, preset value or the solar insolation is below a set value for a pre determined amount of time, the inverter is disconnected from the grid and is operated in a sleep mode. In this mode the inverter power stage components are switched off thereby keeping the stand by losses to a bare minimum
SYSTEM FEATURES AND OPTIONS :
  • Unique MPPT algorithm adjusts the DC Link operating voltage to ensure that maximum power is extracted from the solar array in an effcient manner
  • Automatic sleep mode at night reduces standby losses
  • Local LCD (liquid crystal display) and keypad for system control and monitoring instantaneous system data
  • Time and date stamped system data logs and fault logs available for importation into a spreadsheet for analysis via a local RS232 connection
  • Remote control and monitoring option using either a standard or GSM modem available. Communication based on LAN / WAN protocol is also available. (Optional feature)

Once the utility supply was to return back into its operating range for a predetermined time, then diesel generator will be taken off line and stopped. The inverter module will then connect back in parallel to the utility supply as to continue its normal operation.

  • 3 Phase DSP based design
  • Bi-Directional Inverter / Charger
  • Site Load voltage conditioning
  • No break supply site load
  • Battery Management / Control
  • Diesel Management / Control
  • Local and Remote Monitoring
  • 3 Phase DSP based design
  • Exporting all available power to Utility Grid
  • Fast and efficient MPPT extracts maximum available power from Solar Array and export
  • Full auto mode :- “Wakes Up” in the morning and exports power on availability of sufficient Solar Energy, Grid Voltage and frequency are in permissible Range
  • Automatically disconnects from Grid and reconnects when the Grid is back in range
  • Automatic "Sleep Mode" at night reduces standby loss
  • Local LCD and keypad for system control for monitoring instantaneous system data
  • Remote Control and monitoring option using either a standard or GSM modem available
  • Communication based on LAN / WAN protocol is an optional feature
GRID EXPORT CONDITIONER