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1. (WO2009138808) FILTRE DE PUISSANCE ACTIF MONOPHASÉ À SHUNT À TENSION DE CONDENSATEUR D'UN FILTRE ADAPTATIF
Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

Claims

Single-phase shunt active power filter with adaptive filter capacitor voltage, characterized by, it consists of seven semiconductor switches made of one transistor and one diode (SrS7), inductances (L1-L3) capacitors (C-i, C2), one of them is electrolytic with capacitance larger than I mF, and other filter capacitor voltage between 0,1 μF and 20μF and low voltage typically lower than 50 V power source (PV), one single-pole double-throw switch P, control circuit which is capable of switching the transistors on two different switching frequencies one of those is higher than 20 kHz and other is approximately 5 kHz.

Single-phase shunt active power filter with adaptive filter capacitor voltage regarding to request 1 , characterized by, series connection of filter capacitor voltage {vC2) and renewable energy source voltage (PV) in that way this two voltages are added only durring the interval when the filter capacitor (Ci) is charging from other capacitor (C2).

Single-phase shunt active power filter with adaptive filter capacitor voltage regarding to request 1 , characterized by, its circuit for filter capacitor adoption (S5, S6, /-3, C2) is adopting filter capacitor voltage (\/ci) to conditions in electrical distribution network, tipically to line voltage (vs) and filter current (/». Single-phase shunt active power filter with adaptive filter capacitor voltage regarding to request 1 , characterized by, connection of low voltage, typically 5V to 50V renewable energy source to filter capacitor (Ci) with adaptive voltage (t/ci) with MPPT function realized by redirection of filter capacitor (Ci) charging current by action of single-pole double-throw switch P when it has been charged from capacitor C2 and by action of switch S7. Single-phase shunt active power filter with adaptive filter capacitor voltage regarding to request 1 , characterized by, adoption of filter capacitor voltage (vci) is obtained by switching of switches S5 and S6 on frequency which is lower than switching frequency of switches S3 and S4 and it is typically between 1 kHz and 10 kHz. AMENDED CLAIMS received by the International Bureau on 05 November 2009 (05.11.09)

WHAT IS CLAIMED IS:

1. A single-phase shunt active power filter with adaptive filter capacitor voltage (21) comprising: a single-phase shunt active power filter (1) made from four switches; an adaptive voltage filter capacitor (2), which voltage adapts to conditions in electric network; a single-phase shunt active power filter control circuit (3) which supply switching signal for switch S3 and switch S4, at relatively high frequency, typically 25 kHz; a photovoltaic array (10) which supply energy to said adaptive voltage capacitor C1 (2); an adaptive voltage converter (4), which is charging and discharging said adaptive voltage filter capacitor (2) comprising: a boost converter (5) for discharging an adaptive voltage filter capacitor C\ (2) via Z2 (27) and

S6 (16) or Z2 (27) and diode D6 (9) to DC link capacitor C2 (12); a buck converter (6) for charging of adaptive voltage filter capacitor C1 (2) from DC link capacitor C2 (12) via switch S5 (17), diode Di3 (35), solar array (10) or diode D7 (24) and inductance Z3 (19); a boost PV converter (8) for obtaining a MPPT function of first photovoltaic array (10) and for charging of adaptive filter capacitor (2) via diode Z)6 solar array (10) and inductance Z3 which is supplying energy taken from solar array (10) through the switching action of S5 (17); and an adaptive voltage converter control circuit (15) which supply low frequency switching signal for switch S5 (17) and switch S6 (16), typically 5 kHz, and MPPT function signal for photovoltaic array (10).

2. A single-phase shunt active power filter with adaptive filter capacitor voltage of claim 1, wherein said photovoltaic array (10) are supplying energy for electric network (22) power factor correction, connected to said single-phase shunt active power filter with adaptive voltage filter capacitor (21) consists of seven semiconductor switches made of one transistor and one diode (S1-S7), three inductances (Zi -Z3), two capacitors (Ci, C2) and two additional diodes (Di2, Dj3) and single-phase shunt active power filter control circuit (3) with adaptive voltage control circuit (15).

AMENDED SHEET (ARTICLE 19)

3. A single-phase shunt active power filter with adaptive filter capacitor voltage (21) of claim 1, wherein said adaptive voltage filter capacitor (2) voltage reference waveform is generated by single-phase shunt active power filter control circuit (3) by means of an absolute line voltage vs, increased by scaled product of inverted line voltage polarity and scaled filter current in multiplier (23) according to formula: vc, = 1 • 1 Kl + k ■ Pos(/F - (- I)- sign(vs)) where pos corresponds to positive results and k is around 10.

4. A single-phase shunt active power filter with adaptive filter capacitor voltage of claim 1, wherein said adaptive voltage converter control circuit generates switching signals for switches S5 (17 )and S6 (16) on frequency which is not higher than 20 kHz, typically 5 kHz.

5. A single-phase shunt active power filter with adaptive filter capacitor voltage of claim 1, wherein said filter capacitor voltage is between 0,1 μF and 20μF, typically 8 μF.

6. A single-phase shunt active power filter with adaptive filter capacitor voltage of claim 1 , wherein said it consists of boost converter (5), buck converter (6) and boost PV converter (8).

7. An adaptive voltage converter (4) of claim 6, wherein said buck converter (6) includes an serial connection of capacitance C2 (12), switch S5 (17), diode /J)13 (35), diode /J)7 (24) with parallel connected solar array (10) and inductance Z3 (19) with diode /J)5 (7) in freewheel branch.

8. An adaptive voltage converter (4) of claim 6, wherein said boost PV converter (8) includes a switch S7 (28), inductance Z3 (19), diode /J)7 (36), diode /J)5 (7) and solar array (10).

9. An adaptive voltage converter (4) of claim 6, wherein said inductance Z3 (19) is connected to said adaptive voltage filter capacitor C\ (2).

10. An adaptive voltage converter (4) of claim 6, wherein said inductance Z3 (19) is connected to said solar array (10).

AMENDED SHEET (ARTICLE 19)

11. An adaptive voltage converter (4) of claim 6, wherein said solar array (10) is connected to the diode D7 (24) by electrode, anode and cathode.

12. An adaptive voltage converter (4) of claim 6, wherein said solar array (10) is connected in series with diode Z)13 (35) and switch S5 (17).

13. An adaptive voltage converter (4) of claim 6, wherein said switch S5 (17) is connected in series with diode Dn (35) and DC-link capacitor C2 (12).

14. An adaptive voltage converter (4) of claim 6, wherein said switch S6 (16) is connected in series with diode Z)6 (9) and DC-link capacitor C2 (12).

AMENDED SHEET (ARTICLE 19)