Comparison of two, energy optimizing techniques for PM-machines

Frederiksen, P.S.; Birk, J.; Blaabjerg, Frede

doi:10.1109/iecon.1994.397745

Cited by 8 publications

(7 citation statements)

References 6 publications

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“…The dc-link current is expressed as the sum of a constant component and a perturbation component, so the overall goal of the stabilizing loop is to modulate the frequency proportional to the fluctuation in the average dc-link current, which is the fluctuation in the average power delivered to the motor. The two methods proposed in [2] are the minimum input power method and the power factor method. The first one is generally the same as in [1] and the second one is based on the shape of the dc-link current.…”

Section: Control Without Shaft Position Informationmentioning

confidence: 99%

“…It is well known that the frequency controlled PMSM have stability problems and low-frequency instability exists in this class of machine [1]. Several authors have shown that synchronous motor drives can be stabilized by appropriate frequency inverter modulation as shown in [1], [2] and [3].…”

Section: Control Without Shaft Position Informationmentioning

confidence: 99%

“…In [1] and [2], the measurement of the dc-link current is used in order to get adequate signal for feedback. It is important to note the ease and low price involved in this feedback signal.…”

Section: Control Without Shaft Position Informationmentioning

confidence: 99%

“…Open loop strategies ( [1], [2] and [3]) as well as direct torque control methods ( [4], [5] and [6]) belong to the first group. The second group is formed by closed loop vector control strategies and this group can be subdivided in those controls that are sensored and those that are sensorless.…”

Section: Introductionmentioning

confidence: 99%

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Sensorless control of PM synchronous motors and brushless DC motors - an overview and evaluation

Montesinos¹,

Galceran²,

Blaabjerg³

et al. 2005

2005 European Conference on Power Electronics and Applications

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This paper provides a review of the literature addressing sensorless operation methods of PM brushless machines. The methods explained are state-of-the-art of open and closed loop control strategies. The closed loop review includes those methods based on voltage and current measurements, those methods based on back emfmeasurements, and those methods based on novel techniques not included in the previous categories. The paper concludes with a comparison table including all main features for all control strategies.

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Section: Control Without Shaft Position Informationmentioning

confidence: 99%

Section: Control Without Shaft Position Informationmentioning

confidence: 99%

Section: Control Without Shaft Position Informationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Sensorless control of PM synchronous motors and brushless DC motors - an overview and evaluation

Montesinos¹,

Galceran²,

Blaabjerg³

et al. 2005

2005 European Conference on Power Electronics and Applications

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“…Tal i com es pot veure a [10,11], els motors síncrons d'imants permanents operant en un control V /f en llaç obert tenen problemes d'estabilitat a freqüències baixes. Malgrat tot, diversos autors, [10,11,12], han demostrat que es pot estabilitzar el motor modulant la freqüència de forma adequada.…”

Section: Control V /F En Llaç Obertunclassified

Modelització i control d'accionaments elèctrics.

Montesinos‐Miracle¹

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L'actual situació energètica demanda cada cop més d'aplicacions que redueixin el consum energètic. A nivell d'energia elèctrica, i de la conversió d'aquesta a energia mecànica, els nivells d'eficiència energètica són força elevats si es compara amb altres fonts d'energia com poden ser els combustibles fòssils. Però no per això s'ha de deixar de treballar per tal de millorar l'eficiència d'aquests sistemes. Existeixen certes aplicacions de funcionament continu, que una petita millora en el seu rendiment significa, una gran millora en el consum absolut d'energia. Aquestes aplicacions poden ser bombes, ventiladors i compressors per aplicacions de ventilació, calefacció i aire condicionat (HVAC). En aquestes aplicacions, el cavall de tir fins avui dia ha estat el motor d'inducció. El motor d'inducció és relativament senzill de construir, es coneix molt bé el seu funcionament, i no requereix d'un sensor de posició per tal d'implementar un control de baixes prestacions com el necessari per aquestes aplicacions. Però es pot augmentar l'eficiència del sistema usant un motor síncron d'imants permanents. Aquest, pel fet de ser un motor síncron, necessita que les corrents injectades a l'estator estiguin perfectament sincronitzades amb la posició del l'imant del rotor per tal de produir el parell adequat. Per tant, cal desenvolupar nous mètodes de control, de baix cost, per aquests tipus de motor i que no requereixin d'un sensor de posició acoblat al rotor. Aquest tipus de sensors encareixen el cost final del producte i en redueixen la fiabilitat. Com que les aplicacions HVAC no requereixen d'una alta dinàmica del parell, el control $V/f$ es mostra com una estratègia adequada per aquest tipus de motors per aquestes aplicacions. Però pels motor síncrons d'imants permanents, fins i tot usant aquesta estratègia de control necessiten de la sincronització de la posició del rotor i les corrents injectades a l'estator. La primera part d'aquesta tesi versa sobre el modelat i l'anàlisi del motor síncron d'imants permanents, per proposar una alternativa de control sense sensor de posició pel control $V/f$ del motor síncron d'imants permanents. L'anàlisi d'estabilitat permet veure que es pot afegir esmorteïment al sistema modulant la freqüència d'excitació en funció de les pertorbacions de la potència. Finalment, la proposta es verifica mitjançant simulacions i resultats experimentals. La segona part d'aquesta tesi està enfocada als nous reptes en el control dels accionaments elèctrics i convertidors. L'electrònica de potència en si cada cop té més aplicacions. Convertidors de freqüència, filtres i rectificadors actius, fonts d'alimentació, escalfament per inducció, noves formes de transmissió de l'energia, i les energies renovables incorporen algun convertidor estàtic, i depenen d'aquesta per funcionar. Per tant, cal disposar d'eines per a poder experimentar a tots els nivells en aquests nous camps. El treball presentat a la segona part de la tesi és la feina duta a terme per l'autor durant aquest últims anys en el camp de l'experimentació i la docència del control dels accionaments elèctrics i els convertidors. Aquest treball a dut a la construcció d'una plataforma per a l'experimentació del control dels accionaments elèctrics i els convertidors. Aquesta plataforma es mostra com una eina efectiva també dins el nou Espai Europeu d'Educació Superior, ja que fomenta que sigui l'estudiant qui aprengui i també l'ús transversals dels coneixements. The current energetic situation demands for a reduction in consumption. The efficiency levels in electrical energy and in the electromechanical transformation are high compared with other energy sources, like fossil fuels. But that it is not a reason not to work to increase efficiency. There are some continuous running applications where a small amount of efficiency increase means a huge amount of energy saved per year. These applications are pumps, fans and compressors for heating, ventilating and air conditioning (HVAC), for example. The workhorse for these applications has been for years the induction motor. The induction motor is a well known motor, a cheap motor, and does not require position sensor to implement a low-cost control for this kind of applications. But efficiency can be improved if the induction motor is substituted by a permanent magnet synchronous motor. However, in a permanent magnet synchronous motor, the stator currents have to be synchronized with the rotor permanent magnet in order to produce torque and not to lose synchronization. The need of a rotor position sensor increases cost and reduces reliability. Therefore, it is necessary to develop new control strategies to avoid the use of the rotor position sensor. Because the HVAC applications do not demand for a high performance control, the V/f control strategy is suitable for these drives. However, even using a V/f control strategy for permanent magnet synchronous motor there is a need in synchronization for stator currents with the rotor magnet position. The first part of this thesis deals with modelling and analysis of permanent magnet synchronous motors in order to obtain a sensorless $V/f$ control. The stability analysis shows that adding damping by frequency modulation using input power perturbations stabilize the system. Finally, the method is verified by means of simulations and experimental results. The second part of this thesis deals with the new challenges in drives and power converters. Power electronics is now pervasive in even most applications. Frequency converters, drives, active filters and rectifiers, power supplies, induction heating, new power transmission systems (HVDC) and renewable energy sources include any type of static converter. Hence, it is necessary to develop new tools to experiment and to teach these new applications. The work presented in this second part has been done by the author during these last years in the education and training of drives and power electronics. This work has the result of the construction of a new platform for the experimentation, training and education for drives and power electronics. This unique platform appears as an effective tool also inside the European Higher Education Area, because is a learn-by-doing tool, and uses transverse knowledge from other disciplines.

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