Historically centrifugal yball governors have been

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Unformatted text preview: shunt or combinaGon] •  DistribuGon level •  LTC - transformer load tap changers •  Voltage regulators – staGon and line •  Capacitors – staGon and line •  DistribuGon level FACTS devices •  Smart Grid Volt- VAR control 6 12.2 Generator- Governor Control Generator Governors •  The other key generator control system is the governor, which changes the mechanical power into the generator to maintain a desired speed and hence frequency. •  Historically centrifugal “flyball” governors have been used to regulate the speed of devices such as steam engines •  The centrifugal force varies with speed, opening or closing the throdle valve Photo source: en.wikipedia.org/wiki/Centrifugal_governor 7 Isochronous Governors •  Ideally we would like the governor to maintain the frequency at a constant value of 60 Hz (in North America) •  This can be accomplished using an isochronous governor. •  A flyball governor is not an isochronous governor since the control acGon is proporGonal to the speed error •  An isochronous governor requires an integraGon of the speed error •  Isochronous governors are used on stand alone generators but cannot be used on inte var 1 .0 0 pu MVA 2 3 MW 6 M var A WEBER6 9 2 2 MW 1 5 M var 0 MW 0 M var MVA LA UF1 3 8 1 .0 1 pu 4 5 MW 0 M var 1 .0 2 pu BUC KY 1 3 8 RO GER6 9 2 M var 1 4 MW 3 M var A MVA SA V O Y 6 9 1 .0 2 pu A 4 2 MW 2 M var JO 1 3 8 MVA A MVA 1 4 MW 1 .0 1 pu A MVA SA V O Y 1 3 8 JO 3 4 5 A A 1 5 0 MW -0 M var MVA M...
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