The vector control scheme discussed in this paper includesd-axis and q-axis proportional-plus-integral current regulators,parameter estimators as well as feedback and feedforward control loops. The model discussed in this paper comprises: 1) atwo-dimensional (2-D) magnetic field finite element (FE) modelfor the electrical machine, 2) a state-space model based on anovel augmented form of the modified nodal analysis (MNA)formulation [14] in order to include the Faraday’s induced voltages and currents of the electrical machine as well as simplifythe coupling of the electromagnetic field and electric circuitequations with much simpler and fewer matrix manipulations,3) a motor mode torque vector control model that is based ond-q equivalent circuits of the main machine, and 4) a generatormode voltage control model that is based on d-q equivalent circuits of the main machine and exciter for regulating the outputdc voltage of the machine.Furthermore, the model can adequately capture impacts oftime-varying (instantaneous) load-dependent magnetic saturation which is dependent on instantaneous machine winding currents, space harmonics introduced as a result of the complexmachine magnetic circuit geometry and winding layouts andtheir associated saturation patterns, interaction between spaceharmonics and time harmonics resulting from the switching ofthe power electronic converter, current ripples and associatedtorque pulsations and core losses, and other influences associated with the control structure and scheme.
đang được dịch, vui lòng đợi..
