This paper presents a method of behaviour model control (BMC) combined with fuzzy logic and a seven-level six-phase inverter to achieve mainly a high performance and to increase the robustness of the vector control and to keep its performances despite the presence of perturbations (parameters variations, abrupt load variations, etc.) of a series-connected two motor six phase drive system with single inverter supply. The idea of the proposed control is to induce adding supplementary control inputs, which yield the process to follow the model. The best of feature of this control design is that it achieves the same performances as the Field Oriented Control without the need for heavy and expensive gain tuning. The effectiveness of the proposed behaviour model control in conjunction with the fuzzy logic is confirmed through the application of different load torques for wide speed range operation. Comparison between fuzzy behaviour model control, fuzzy logic controller (FLC) and conventional controller (PI) of the proposed two-motor drive is provided. The simulation results confirm also that, the validity and effectiveness of the control strategy proposed in both terms of performance and robustness (rotor inertia variations J1=5J1nominal) of the provision of such an adaptive control for electrical drives with the two machines of the system.
Słowa kluczowe: Multi-Machines System (MSCS), Vector Control, Fuzzy Adaptive Control, Behaviour Model Control (BMC).
W artykule opisano wykorzstanie metody BMC (behaviour model control) wspartej logiką romytą w siedmiopoziomowym sześciofazowym przekształtniku w celu osiągnięcia dobrych parametrów I zwiększenia odpoeności w obecności zakłóceń. Osiągnioęto podobne parametry co w przypadku stosowania metody FOC (field oriented control) bez koniczności stosowania dopasowania wzmocnienia.
Keywords: system wielomaszynowy, przekształtnik, logika rozmyta, sterowanie adapatacyjne.
Many industrial applications, such as the textile industry, paper mills, robots, require several electric motors. The first generation of multi-machine systems is limited in two configurations. The first configuration consists of a continuous stage which supplies multiple three phase inverters connected in parallel, where each inverter supplies a three-phase machine [1-3]. The control of each machine is independent via its inverter and its control algorithm while the second one is a system with parallel-connected threephase motors fed from a single three-phase VSI, for this structure, the machines must have the same rotation speed and undergo the same load torque. These conditions make the system usable in a limited number of applications [4-6]. Furthermore, the independent control of each machine is impossible in this configuration. As a solution to this problem, this paper shows the possibility of independently controlling a multi-machine power system with the supply coming from only one inverter. Such an independent control is enabled by using an appropriate series connection of stator windings of multi-phase motors and vector control principles. The basic principles of the concept emerge from the fact that multi-phase machines, regardless of the number of phases, require only two currents for independent flux and torque control. Therefore, there are additional currents, which can be used to control other machines in the group An appropriate series connection of the stator windings converts the flow/ torque production currents of a machine into flow / torque production currents for other machines, thus allowing independent control of each motor in the group using vector control. An appropriate series connection of the stator windings converts the flux/torque producing currents of one machine into the non-flux/torque producing currents for the other machines, allowing independent control of each multi-phase motor using a [...]
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