3 research outputs found
A New Dual Lagrangian Model and Input/Output Feedback Linearization Control of 3-Phase/Level NPC Voltage-Source Rectifier
An input/output feedback linearization control strategy is developed for control of three-level three-phase neutral-point-clamped rectifier using its dual Lagrangian modeling. The load current of the rectifier can be given in two forms: (i) the load current involving the current of capacitor C1 (ii) the load current involving the current of capacitor C2. Applying the obtained load current to the Euler-Lagrange parameters of the rectifier, two nonlinear models of the system are derived. The models are based on the superposition law of the load current and the Euler-Lagrange description of the rectifier. Also, the two power-balance equations between the input and output sides are obtained by considering the effects of two load currents separately. Then, the two nonlinear models and power-balance equations are linearized using inputâoutput feedback linearization, and the state feedback law controlled inputs are completed by pole placement. With the definition of outputs of the feedback linearization law, the zero dynamics of the system are avoided and a fast output voltages control scheme is designed. Finally, some integrators are added to robust control against parasitic elements. The proposed nonlinear controller is compared to the PI controller and the MATLAB/SIMULINK results verify the proposed control strategy.UpravljaÄka strategija zasnovana na ulazno/izlaznoj linearizaciji u povratnoj vezi razvijena je za upravljanje trofaznog trorazinskog ispravljaÄa u spoju sa zajedniÄkom srednjom toÄkom koriĆĄtenjem njegova dualnog Lagrangian modeliranja. Struja troĆĄila ispravljaÄa moĆŸe se prikazati u dvije forme: (i) struja troĆĄila koja ukljuÄuje struje obaju kapaciteta C1 (ii) struja troĆĄila koja ukljuÄuje samo struju kapaciteta C2. Primjenom dobivene struje troĆĄila na Euler-Lagrangeove parametre ispravljaÄa izvedena su dva nelinearna modela sustava. Modeli su zasnovani na zakonu superpozicije struje troĆĄila i Euler-Lagrangeova opisa ispravljaÄa. Dobivena su dva zakona o ravnoteĆŸi snaga izme.u ulazne i izlazne strane uzimajuÄi u obzir uÄinke dvaju struja troĆĄila zasebno. Dva su nelinearna modela i zakoni o ravnoteĆŸi snaga zatim linearizirani pomoÄu ulazno/izlazne linearizacije u povratnoj vezi i ulazi su upravljani s povratnom vezom po varijablama stanja uz metodu odabira polova sustava. Definiranjem izlaza upravljaÄkog zakona zasnovanog na linearizaciji po povratnoj vezi, zaobiĆĄla se dinamika nula u sustavu te je dizajnirana shema s brzim upravljanjem izlaznim naponima. Naposlijetku, integratori su dodani za postizanje robusnosti na parazitske elemente. PredloĆŸeni nelinearni regulator usporeÄen je s PI regulatorom, a rezultati su provjereni u MATLAB/SIMULINK okruĆŸenju