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I have two DG sets which are to be synchronized on to the same AC bus and needless to say, they must share load. I have gathered some parametric data which I felt would decide how well these can work as part of single bus. But I am not sure, and would like to know what the experts feel about these two DG sets getting synced easily.

DG-1

Engine Data:

  • 1200KW
  • 50Hz
  • Power Factor (Cos Phi): 0.7

Generator Data:

  • 3 Phase - 6 Wire
  • X Wye Delta,
  • X Series Parallel
  • 600 Volts
  • 1828 Amps
  • 1714KVA
  • Sub Transient X"D : 0.133 per unit 0.028 Ohms
  • Transient X"D : 0.197 per unit 0.043 Ohms

Excitation Data:

  • 31 Volts, 7.1 Amps
  • Separately Excited

Frame: - 826 Frame - 1500 Rev/Min

DG-2

Engine Data:

  • 1330KW - KW is specified at a higher PF here
  • 50Hz
  • Power Factor (Cos Phi): 0.8

Generator Data:

  • 3 Phase - 6 Wire
  • KH734E Wye
  • P7 Series
  • 600 Volts
  • 1492 Amps - So Amps is much lesser than DG-1
  • 1662.5KVA - So KVA is slightly less than DG-1
  • Sub Transient X"D : 0.101 per unit 0.092 Ohms
  • Transient X"D : 0.581 per unit 0.21 Ohms

Excitation Data:

  • 45 Volts, 3.5 Amps - Excitation power is also much lesser than DG-1
  • Separately Excited

Frame: - Steel Frame - 1500 Rev/Min

Any kind of help shall be highly appreciated.

Best Regards,

Vishal

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  • \$\begingroup\$ Sharing the load is not a generator problem. That a controls problem. What do you know about the controls? Most generators can run parallel, except when rotor wasn't meant for it. (extreme weight reduction for example) \$\endgroup\$ – Jeroen3 Jul 2 '19 at 10:59
  • \$\begingroup\$ @Jeroen3, Thanks. The controls are identical. Excitation transformers have tappings so they can be chosen accordingly. Governors are same, 0 - 200mA for throttle, which is then converted to PWM by the ECU. \$\endgroup\$ – Vishal Jul 2 '19 at 11:08
  • \$\begingroup\$ Not only the engine has controls. The generator has too, so does the kw sharing (different unit) and the circuit breakers. \$\endgroup\$ – Jeroen3 Jul 2 '19 at 11:24
  • \$\begingroup\$ OK, So I gather from your comment that, if the controls have enough flexibility (Engine-Generator controls) and ACBs, then these can work together, right? No issues are peeping out, right. \$\endgroup\$ – Vishal Jul 2 '19 at 11:28
  • \$\begingroup\$ The most significant issue peeping out is that you did not share enough information to be able to answer yes or no if you r sets can run load (kw) sharing. \$\endgroup\$ – Jeroen3 Jul 2 '19 at 11:45

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