By Duco W. J. Pulle, Pete Darnell, André Veltman
· offers an total realizing of all facets of AC electric drives, from the motor and converter to the applied regulate set of rules, with minimal arithmetic needed
· Demonstrates tips to enforce and debug electric force structures utilizing a suite of devoted structures, motor setup and software program instruments in VisSim™ and PLECS™
· No professional programming talents required, permitting the reader to pay attention to force development
· allows the reader to adopt real-time keep watch over of a secure (low voltage) and coffee fee experimental drive
This ebook places the elemental and complex ideas in the back of electrical drives into perform. fending off concerned arithmetic every time sensible, this publication indicates the reader how one can enforce quite a number modern-day electric force options, with no requiring intensive programming abilities. It permits the consumer to construct and run a sequence of AC force suggestions, starting from very uncomplicated drives to classy sensorless drives. consequently the ebook is the one sleek source on hand that bridges the distance among simulation and the particular experimental surroundings. Engineers who have to enforce an electric force, or transition from sensored to sensorless drives, in addition to scholars who have to comprehend the sensible points of operating with electric drives, will vastly take advantage of this particular reference.
Read Online or Download Applied Control of Electrical Drives: Real Time Embedded and Sensorless Control using VisSim™ and PLECS™ PDF
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Extra info for Applied Control of Electrical Drives: Real Time Embedded and Sensorless Control using VisSim™ and PLECS™
The reason for this is that there is a voltage drop across the power electronic devices. Furthermore, deadtime introduced to avoid ‘shoot through’ (a situation where two switches of one converter leg conduct simultaneously) will also cause a error between average converter voltage per sample Ts and reference phase voltage values. • The phase current, clearly shows a current ripple component caused by the PWM of the converter. 5 kHz (as to better observe the switching process. For actual experimental operation a PWM frequency of 30 kHz is typically selected, which leads to a much lower current ripple component.
The chosen logic sequence of the signals a; b; c and the duration for which these should be active is determined by the three phase reference ref ref signals uref R ; uS ; uT . These input signals are then scaled by half the DC bus voltage uDC=2, in which case they are referred to as modulation indices: mref ; mref ; mref , which R S T are connected to the pulse width modulation unit that generates the three logic signals a; b; c for the switches. When a gate signal is ‘1’ the corresponding bipolar switch is connected to the DC supply source.
An on/off switch has been added to this motor model to simulate a locked rotor situation (rotor locked, when set to ON). In addition, a shaft speed dependent load module has been provided, which allows the user to apply a quadratic load characteristic to the machine. As with the previous case a set of sliders is used to define the voltage vector, in terms of its amplitude and rotational speed. However in this case a ‘pre-scaling’ module (as discussed in Sect. 2) has been added to convert the floating point variables required for the controller to fixed point format.