Portal de Periódicos da CAPES

A New Dual Lagrangian Model and Input/Output Feedback Linearization Control of 3-Phase/Level NPC Voltage-Source Rectifier

2014; Taylor & Francis; Volume: 55; Issue: 1 Linguagem: Inglês

10.7305/automatika.2014.01.230

1848-3380

Majid Mehrasa, Masoud Ahmadigorji, Nima Amjady,

Advanced DC-DC Converters

AbstractAn 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 input-output 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.Upravljačka strategija zasnovana na ulazno/izlaznoj linearizaciji u povratnoj vezi razvijena je za upravljanje trofaznog trorazinskog ispravljača u spoju sa zajedničkom srednjom točkom korištenjem njegova dualnog Lagrangian modeliranja. Struja trošila ispravljača može se prikazati u dvije forme: (i) struja trošila koja uključuje struje obaju kapaciteta C1 (ii) struja trošila koja uključuje samo struju kapaciteta C2. Primjenom dobivene struje trošila na Euler-Lagrangeove parametre ispravljača izvedena su dva nelinearna modela sustava. Modeli su zasnovani na zakonu superpozicije struje trošila i Euler-Lagrangeova opisa ispravljača. Dobivena su dva zakona o ravnoteži snaga između ulazne i izlazne strane uzimajući u obzir učinke dvaju struja trošila zasebno. Dva su nelinearna modela i zakoni o ravnoteži snaga zatim linearizirani pomoću ulazno/izlazne linearizacije u povratnoj vezi i ulazi su upravljani s povratnom vezom po varijablama stanja uz metodu odabira polova sustava. Definiranjem izlaza upravljačkog zakona zasnovanog na linearizaciji po povratnoj vezi, zaobišla se dinamika nula u sustavu te je dizajnirana shema s brzim upravljanjem izlaznim naponima. Naposlijetku, integratori su dodani za postizanje robusnosti na parazitske elemente. Predloženi nelinearni regulator uspoređen je s PI regulatorom, a rezultati su provjereni u MATLAB/SIMULINK okruženju.Key words: Euler—Lagrange (EL) model3 level/phase NPC rectifierInput/output feedback linearizationPower-balance equationsState feedback law controlled inputsKljučne riječi: Euler—Lagrangeov (EL) modeltrofazni trorazinski NPC ispravljačlinearizacija pomoću ulazno/izlazne povratne vezejednadžbe ravnoteže snageupravljanje po varijablama stanja Additional informationNotes on contributorsMajid MehrasaMajid Mehrasa was born in Iran, on September 1983. He received the B.S. and M.S. degrees in Electrical Engineering from Noshirvani University, Babol, Iran, in 2006 and 2009, respectively. His research interests are nonlinear control and observation with applications to control of electric power converters and application of power electronics to power systems.Masoud AhmadigorjiMasoud Ahmadigorji was born in Sari, Iran, on August 1984. Obtained his B.Sc and M.Sc. Degrees in Electrical Engineering from Khajeh-Nasir Toosi University of Technology and Sharif University of Technology, Tehran, Iran in 2006 and 2008, respectively. Currently, he is Ph.D. student in Power Electrical Engineering at Semnan University, Semnan, Iran. His areas of interest are power system optimization, Distribution system planning, Distributed Generation (DG), and application of power electronic in power system.Nima AmjadyNima Amjady was born in 1971 in Tehran, Iran. He received the B.Sc., M.Sc., and Ph.D. degrees in electrical engineering from Sharif University of technology, Tehran, in 1992, 1994 and 1997, respectively. At present, he is professor with the Electrical Engineering Department, Semnan University, Semnan, Iran. His research interests include security assessment of power systems, reliability of power networks, load and price forecasting, artificial intelligence and its application to the problems of power systems.