The term swing generator in island mode can operate in the following scenario: It's the LAW! RE: Voltage control / MVAr Mode - Generator Parallel Operation rockman7892 (Electrical) 28 May 21 18:53 In system with generators of different types and different fuel efficiencies, MVAR control may be used to shift The MVAR demand to the less efficient sets to allow the more efficient sets to generate more real power. There may be other reasons for MVAR control. This scheme resulted in a substantial increase in the transmission line capacity. With the diesel sets pumping out MVARs and little or no real power, the fuel costs were negligible. The old diesel plant was started up and the sets run under MVAR control during peak periods, to pump MVARs into the line to offset transmission line voltage drop. The transmission line voltage drop was mostly reactive. In this case the capacity of the line was limited by the ability of the OLTCs to compensate for transmission line voltage drop. There are a number of reasons to control MVAR sharing between the different generators in a system.Ī city was originally supplied by a diesel generator plant.Ī large hydro-electric facility was constructed in the country and the city was supplied by a long transmission line.Īs the city grew, the capacity of the transmission line was reached. The load sets the MVAR demand on the system. ![]() MVAR control is to control MVAR sharing in side a system. Voltage control is the basic control for a system. RE: Voltage control / MVAr Mode - Generator Parallel Operation davidbeach (Electrical) 27 May 21 01:19 Please see FAQ731-376: Forum Policies for tips on how to make the best use of Eng-Tips. "Live and act within the limit of your knowledge and keep expanding it to the limit of your life." Ayn Rand, Atlas Shrugged. The method waross stated is used in older control systems where individual generator controllers can't communicate with each other. Many modern generator controllers can be networked and will load share and regulate frequency and voltage via network communications, so you wouldn't need to run one isochronous and the rest in droop, or all in droop, and you wouldn't need cross-current compensation for var sharing if that's the case. I disagree with waross slightly for what to do in practice depending on the type of generator controllers available. This would be useful for modeling sources that can have specific active and reactive power flow commanded via setpoints. I think Mvar control mode is used for generators that would have constant active and reactive power flow and allow bus voltage magnitude and voltage angle to vary. ![]() Voltage-control mode (PV mode) is used to keep voltage magnitude constant on the bus and have constant active power flow out of those generators, while allowing bus voltage angle and reactive power output to vary. The swing (slack) generator keeps voltage magnitude and voltage angle constant at the bus, while allowing its active and reactive power to vary. This is because the two state variables are voltage magnitude and voltage angle at each bus, and the two input variables are active and reactive power. For each mode, two of these are held constant and two are allowed to vary as the nonlinear solver works the problem. There are four parameters of concern in load flow analysis: voltage magnitude, voltage angle, active power, and reactive power. I agree with FreddyNurk regarding the ETAP analysis setup (use one as swing and the others in voltage-control mode).
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