MANLEY-ROWE TYPE RELATIONS CONCERNING THE ACTIVE PSEUDOPOWERS

Transcription

1 BULETINUL INSTITUTULUI POLITEHNIC DIN IAŞI Publicat de Universitatea Tehnică Gheorghe Asachi din Iaşi Tomul LX (LXIV), Fasc. 1, 2014 Secţia ELECTROTEHNICĂ. ENERGETICĂ. ELECTRONICĂ MANLEY-ROWE TYPE RELATIONS CONCERNING THE ACTIVE PSEUDOPOWERS Received: January 6, 2014 Accepted for publication: January 20, 2014 BY HUGO ROSMAN * Gheorghe Asachi Technical University of Iaşi Faculty of Electrical Engineering Abstract. It is proved that the active pseudopowers, intervening in Tellegen s theorem, satisfy Manley-Rowe type relations when the voltages and the currents are double periodical functions of time, having the same freuencies, f 1 = ω 1 /2π, f 2 = ω 2 /2π. Key words: pseudopowers; active pseudopowers; Manley-Rowe relations; generalized Manley-Rowe relations. 1. Introduction In 1952 Tellegen has established an important theorem, called in specialty literature as Tellegen s theorem. This one has determined the introduction, in the electrical networ theory, of the pseudopower concept; for instance such a power was utilized among the first researchers, by Penfield, Spence and Duner in their boo published in A generalization of Tellegen s theorem in the electromagnetic field and, implicitly, the defining of pseudopowers in such a case, was proposed by Andrei Ţugulea, (1986), named by the author electromagnetic pseudopower. It is necessary to underline that in all these cases it is a matter of instantaneous powers. In view to define the pseudopowers in an electrical networ it is * adi_rotaru2005@yahoo.com

2 10 Hugo Rosman necessary, beforehand to formulate Tellegen s theorem in case of an electrical networ. Let be two insulated active or passive, linear, non-linear or parametric electrical networs, and (II), having identical oriented topological graphs, and let be u ( t 'he voltage between the nodes incident to branch in networ at moment t and i (II) ( t '') the current which flows through branch of networ (II) at moment t, with = 1,2,,B, (B number of branches). The two networs woring regime is considered uasistationary, of anelectrical type. Relation B (II) u ( t ') i ( t '') 0 (1) 1 is satisfied, representing Tellegen s theorem (in case of electrical networs). Expression (II) p ( t ', t '') u ( t ') i ( t '') (2) represents the instantaneous pseudopower in networs and (II) branch. In the particular case when t = t = t the previous relation becomes (II) p u ( t) i ( t). (3) If signals u ( t ), i (II) ( t ) are periodic, having a harmonic variation vs. time with the same freuency f = 1/T, it is possible to define: a) an active pseudopower in networs and (II) branch which admits the well nown symbolical representation and b) a reactive pseudopower T 1 P p ( t)dt T, (4) in branch of the same networs. 0 P e U I (5) Q m U I (6) 2. Manley-Rowe Type Relations Concerning the Active Pseudopowers In view to establish such relations some results obtained in a previous wor (Rosman, 1972), were taen into account. Namely, considering two scalar

3 Bul. Inst. Polit. Iaşi, t. LX (LXIV), f. 1, functions, m(t), n(t), double periodic with respect the time, which admit the developments in complex double Fourier series (Tolstov, 1956) j( p m( t) M p, e, p j( p n( t) N p, e, p (7) where T 1 = 2π/ω 1, T 2 = 2π/ω 2 represent the two double periodic functions periods and j( p M p, d( 2 2t) m( t)e d( 1t ), j( p N p, d( 2 2t) n( t)e d( 1t ), 4 (8) represent the complex double Fourier series (7) inverse transfoms, tae place the following Manley-Rowe (M.-R.ype relations (Rosman, 2004) * * p, p, p, p, pe M N e M N 0, 0 p p (9) p p available only if the function m(n) satisfies the unicity condition Considering that m ( n )dn 0. (10) (II) m u, n u, ( 1,2,..., B) (11) the networs and (II) having B branches each one, taing in account expressions (8) it is possible to establish the following relations j( p ' U ; p, d( 2 2t ') u ( t ')e d( 1t '), (II) 1 (II) j( p I ; p, d( 2 2t '') I ( t '')e d( 2t ''). 4 (12) Using the same proceeding as in the previous section and supposing that

4 12 Hugo Rosman relations udi 0 (13) ; p, ; p, ; p, ; p, pe U I e U I 0, 0 p p (14) p p are obtained analogous to (9). Having in view relation (5), expressions (14) may be written pp P ; p, ; p, (15) 0, 0, p p p p where ; p, ; p, ; p, P e U I (16) represents the active pseudopower changed by harmonics of ran p and between the networs and (II) branches. Relations (15) may be considered as representing M.-R. type relations regarding the active pseudopowers where branches of networs and (II). In the particular case when networs and (II) coincide the proper M.-R. relations concerning the branch of respective networ are obtained. 3. Generalized Manley-Rowe Type Relations Concerning the Active Pseudopowers In a recent paper (Rosman, 2004) was proven that considering two scalar functions, m(t), n(t), double periodic with respect to time, which admit the developments in complex double Fourier series (7), generalized M.-R. type relations are satisfied, named by us Manley-Rowe-Kontorovich (M.-R.-K.) relations (8), having the following expressions p p * p, p, ( p, ) e M N p * p, p, ( p, ) m M N p 0, 0, where M p+μ,+ν, N p+σ,+τ are given by relations analogous to (8), and (17)

5 Bul. Inst. Polit. Iaşi, t. LX (LXIV), f. 1, ( p, ) ( p, ), ( p, ) ( p, ) (18) are two arbitrary functions, the first, odd and the second, even, with respect to p and, and μ, ν, σ, τ. Using an analogous procedure to that utilized in section 2 the relations p p ; p, ; p, ( p, ) e U I p ; p, ; p, ( p, ) m U N p 0, 0, (19) are obtained. These relations may be considered as representing generalized M.-R.-K. relations concerning the active pseudopowers. It is necessary to underline that the expressions eu ; p, I ; p, ;, N ;, p p, m U represent pseudoactive, respectively pseudoreactive powers, in the sense used by us. 4. Conclusions Considering two linear, non-linear or parametric insulated electric networs, and (II), having identical oriented topological graphs and the branchs voltages and currents double periodical functions with respect to time, denoting with U ; p, and (II) ; p, I the complex double Fourier series inverse transformations of the voltage between the terminals of networ s branch and, respectively, of the current which flows through networ s (II) branch, ( = 1, 2,, Bhe two signals referring to same harmonics at moment t, respectively t. Manley-Rowe type relations concerning the active pseudopowers in -branch of the two networs, and (II), are established REFERENCES Manley J.W., Rowe H.E., Some General Properties of Nonlinear Elements. Proc. of the I.R.E., 44, 7, (1950). Penfield P., Spence J.R., Duiner S., Tellegen s Theorem and Electrical Networs. MIT Press, Cambridge, Mass., USA, Rosman H., About Kontorowichţs Generaliyation Manley-Rowe Relations. Bul. Inst. Politehnic, Iaşi, XXVII (XXX), 3-4, s. Electrot., Energ., Electron., 9-13 (1980). Rosman H., Generalized Manley-Rowe Relations. Bul. Inst. Politehnic, Iaşi, XVII (XXII), 1-2, s. Electrot., Electron., Autom., (1972).

6 14 Hugo Rosman Rosman H., A New Generalization of Manley-Rowe-Kontorowich Relations. Rev. Roum. Sci. Techn., s. Électrot. et Énerg., 49, 4, (2004). Tellegen B.D.H., A General Networ Theorem with Applications. Phillips Rev., 7, (1952). Tolstov G.P., Serii Fourier (trad. din l. rusă). Edit Tehnică, Bucureşti, 1956, cap. VII. Ţugulea A., The Electromagnetic Pseudo Powers Conservation. A Generalization of Tellegen s Theorem for Electromagnetic Field Quantities. Rev. Roum. Sci. Rechn., s. Éectrot. Et Énerg., 31, 3, (1986). RELAŢII DE TIP MANLEY-ROWE RELATIVE LA PSEUDOPUTERILE ACTIVE ŞI REACTIVE (Rezumat) Se stabilisc relaţii de tip Manley-Rowe relative la pseudoputerile active şi reactive, definite de către Penfield, Spence şi Duiner în legătură cu teorema lui Tellegen. Se propune şi o generalizare a acestor relaţii.