风力异步电动机_中英文翻译_毕业论文(14)

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The actual rotor current direct, irds, and quadrature, irqs, components corresponding to figure 5 are shown in figure6. The effect of the step change in Te* is apparent on the irqs (the superscript s indicates that the variable is referred to the stator) as expected. The irqs* component at 1550 rpm contains small transient responses at t=3s and t=4s that are due to the step changes in the Qs value. The step change in Qs*, shown in figure 5, causes a fast change in irds*, figure 6, as there is initially an error between the reference and actual Qs as the control takes a short while to respond. The current regulation is tuned to ensure that the bandwidth prevents the controller responding to such transients while still achieving a suitable speed of response.The equation based tuning used to design the controller gives similar values of proportional and integral gains for the current regulation direct and quadrature loops to those used by Holdsworth et al [10].

3.2. IG Mode (T and Flux Control)

The reference values for the controller in IG mode are stator flux linkage and torque. Two conditions are

investigated for the 2 MW generator in IG mode, start-up and torque step responses, at 400 rpm (minimum IG mode speed [12]) and 1420 rpm (generated power at this speed corresponds to the upper power rating of rotor converter, 600 kW). The reference and actual torque, Te, and stator flux linkage, λsr (the superscript r indicates that the variable is referred to the rotor), for both speeds are shown in figure 7.

The steady-state Te is the nominal value for the speed of operation, 320 Nm for 400 rpm and 4081 Nm for 1420 rpm derived from figure 1. A start-up sequence is required to establish the rated λsr in the machine, for a given speed, by means of a ramp, figure 7, before the machine can generate power.

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