PL228281B1 - Integrated converter-based system for producing electrical energy - Google Patents

Abstract

The system includes a motor (101) connected to the speed controller and a generator (102) coupled to it by a shaft, which is connected to an AC voltage converter connected to a current and voltage regulator. The converter output is connected to a low-pass filter in the form of an inductor (105) connected to a capacitor (153) and contains an energy storage unit with an alternating voltage converter (152). To connect the induction coil (105) with the capacitor (153), a DC-to-AC voltage converter (107) is connected successively via the voltage measuring element (68), the current measuring element (55) and the induction coil (106), with its AC voltage output, which With a DC input, it is connected to a DC-to-DC voltage converter (108) and has an energy store (109) connected via an induction coil (49) and a current measuring element (46) with a voltage measuring element (110) connected in parallel. The current measuring element (55) is connected to the input (7') of the current regulator (163) of the energy storage circuit (152), whose input (4') is connected to the output (7') of the intermediate voltage regulator (162) of the energy generating circuit (151), and the output (4') of the setter (84) of the power generation circuit (151) is connected to the input (1') of the current regulator (163) and the output (6') of the intermediate voltage regulator (162) is connected to the input ( 3') of the charging regulator (167) of the energy storage circuit (152) and that the output (3') of the setter (84) is connected to the input (1') of the charging regulator (167), and the output of the voltage measuring element (54) is connected to input (5') of the intermediate voltage regulator (162) and with the input (5') of the setter (84) and the input (4') of the charge regulator (167), wherein the output (7') of the voltage regulator (164) of the power generation circuit is connected with the input (2') of the current regulator (163) and with the input (3') of the adder (52).

Description

(21) Filing Number: 406452 (51) Int CI.

H02P 9/06 (2006.01) H02J 3/32 (2006.01)

Patent Office of the Republic of Poland (22) Application date: 09.12.2013 (54) Integrated converter system for electricity generation

(43) Application was announced: June 22, 2015 BUP 13/15 (73) The right holder of the patent: WARSAW UNIVERSITY OF TECHNOLOGY, Warsaw, PL (45) The grant of the patent was announced: 30/03/2018 WUP 03/18 (72) Inventor (s): WLODZIMIERZ KOCZARA, Warsaw, PL

o. o

CM

CM

CM

Ω.

PL 228 281 B1

Description of the invention

The subject of the invention is an integrated converter system for generating electricity of alternating voltage, intended especially for receivers with high load variability.

A variable speed-controlled converter for generating electricity is known. A generator driven by a speed-controlled motor produces an AC voltage of varying amplitude and frequency, which is converted by a controlled rectifier into a stabilized DC voltage known as the DC link voltage. The power electronic converter is connected to the intermediate DC circuit, which converts the direct voltage into alternating voltage using the pulse-width modulation method, filtered by a low-pass filter system consisting of a series induction coil and a parallel capacitor bank. The filtered voltage has a sinusoidal wave of constant amplitude and frequency. The design of an automatic speed control of a generator of a power generating system is known.

Known from the patent specification No. US 61 752 217 is an electric power generation system with a variable speed generator in which the energy storage is connected to an intermediate DC voltage circuit through a controlled bidirectional converter, an energy storage consisting of batteries or supercapacitors.

There is a known system of a controlled energy storage connected, through a power electronic converter, to the power grid of alternating voltage on the side of energy consumers.

An object of the invention is to temporarily increase the power of an AC voltage source without increasing the power of the power generating circuit by controlling the energy storage circuits with signals from the power generating circuit.

The essence of the solution according to the invention for connecting an induction coil with a filter capacitor is a DC-to-AC converter connected successively through a voltage measuring element, a current measuring element and an inductor with its AC-voltage output, which with its DC input is connected to a DC-to-DC converter and has an energy storage connected via an inductor and a current measuring element with a voltage measuring element connected in parallel.

The current measuring element is connected to the input of the current regulator of the energy storage circuit, the input of which is connected to the output of the intermediate voltage regulator of the power generating circuit, and the output of the power generating circuit setter is connected to the input of the current regulator, and the output of the intermediate voltage regulator is connected to the input of the charge regulator energy storage circuit. The output of the setter is connected to the input of the charge regulator, and the output of the voltage measuring element is connected to the input of the intermediate voltage regulator and the input of the setter to the input of the charging regulator. The output of the voltage regulator of the power generating circuit is connected to the input of the current regulator and to the input of the totalizer.

The solution according to the invention is characterized in that the power generating circuit can operate as a speed-controlled system allowing the drive motor to operate with high energy efficiency and despite the reduced power supplied by the generator.

The subject of the invention is presented in the embodiment in the drawing showing a schematic-block diagram of an electric power generation system, in which one parallel branch being the energy storage circuit is connected to the output of the electric power generation circuit.

As shown, a receiver 203 is connected to the output of integrated power generation 201. Integrated power generation 201 comprises a power generating circuit 151 connected to an energy storage circuit 152 and a capacitor 153 forming a common output. The drive motor 101 is connected via a rigid shaft, via a speed measuring element 112, to a generator 102. The output of the generator 102 is connected to an input of a rectifier 7, to which a DC output is connected, via a current measuring element 23, a converter 103. The output of the converter 103 is connected, via a voltage sensing element 21, to the input of a converter 104, the output of which is connected via an inductor 105 and a current sensing element 24 to a capacitor 153, and via a voltage sensing element 68 to the output of a power generating system 201. Energy store 109 to which the element is connected the voltage measuring element 110 is connected via a current measuring element 46 and via an inductor 49 by a converter 108, the output of which is connected via

A voltage measuring element 64 is connected to the input of the converter 107, the output of which is connected via an inductor 106 and a current measuring element 55 to the output of the power generating system 201. A speed controller 161 is connected via its output 2 'to the input of the motor 101. Input 3 'speed controller 161 is connected to the output 1' of the minimum speed controller 171. The input 1 'of the speed controller 161 is connected to the output 1' of the intermediate voltage generator 172. The input 4 'of the speed controller 161 is connected to the output of the intermediate voltage measuring element 21. Output 3 'of the intermediate voltage regulator 162 of the power generating circuit 151 is connected to the input 103' of the converter 103. The output 1 'of the intermediate voltage adjuster 173 is connected to the input 2' of the intermediate voltage regulator 162 of the power generating circuit 151. The output of the current measuring element 23 is connected to the input 9 an intermediate voltage regulator 162 of a power generating circuit and 151. The output 1 'of the intermediate voltage source 173 is connected to the input 2' of the intermediate voltage regulator 162 of the power generating circuit 151. The output 1 'of the intermediate voltage source 179 is connected to the input 1' of the intermediate voltage regulator 162 of the power generating circuit 151. The output of the measuring element. the intermediate voltage 21 is connected to the input 4 'of the intermediate voltage regulator 162 of the power generating circuit 151. The output 1' of the current source 180 is connected to the input 8 'of the intermediate voltage regulator 162 of the power generating circuit 151. Input 5' of the intermediate voltage controller 162 of the power generating circuit 151 is connected to the output of the voltage sensing element 54 of the energy storage circuit 152. The output 6 'of the intermediate voltage regulator 162 of the power generating circuit 151 is connected to the input 4' of the current regulator 163 of the energy storage circuit 152. The output 6 'of the intermediate voltage regulator 162 of the power generating circuit 151 is connected to the output 6' of the intermediate voltage regulator 162 of the power generating circuit 151. connected with through the output 3 'of the charge regulator 167 of the energy storage circuit 152. The input 7' of the charging current adjuster 84 of the energy storage circuit is connected to the output 7 'of the voltage adjuster 174 of the intermediate voltage of the power generating circuit 151. The input 6' of the charging current adjuster 84 is connected to the output 6 '. an intermediate voltage adjuster 162 Vdcklr of the energy storage circuit 152. Input 2 'of the charging current adjuster 84 is connected to the output of the measuring element 21 of the intermediate voltage Vdcg of the power generating circuit 151. The output 3' of the charging current adjuster 84 of the energy storage circuit 152 is connected to the input 1 'of the controller Charge current adjuster 84 output 4 'is connected to input 1' of current regulator 163. Charge current adjuster input 5 '84 is connected to an output of measuring element 54 of the intermediate voltage of the energy storage circuit 152. Voltage regulator 164 of the power generating circuit 151 is connected. by its entrance 6 'to exit 1 The voltage regulator 164 is connected via its input 5 'to the output 1' of the voltage amplitude adjuster 176. The voltage regulator 164 of the power generating circuit 151 is connected via its output 7 'to the input 3' of the current component 52 and to the input 2 'of the regulator. current 163 of the energy storage circuit 152. The voltage regulator 164 of the power generating circuit 151 is connected through its input 6 'to the output 1' of the current generator 177. The input 4 'of the current regulator 164 of the power generating circuit 151 is connected to the output of the voltage sensing element 68 of the power generating circuit 151. Input 3 'of voltage regulator 164 is connected to the output of current sensing element 24 of power generating circuit 151. Output 8' of voltage regulator 164 is connected to input 104 'of converter 104. Output 1' of reactive current generator 178 is connected to input 3 'of current regulator. 163 of the energy storage circuit 152. The output of current sensing element 55 is connected one to the input 7 'of current regulator 163. The output 5' of current regulator 163 is connected to input 2 'of adder 52. Output 6' of current regulator 163 is connected to input 1 'of adder 52. Output 4' of adder 52 is fed to input 107 inverter 107. Input 1 'of charge controller 167 is connected to output 3' of charge controller 84. Input 2 'of charge controller 167 is connected to output 1' of maximum charging current adjuster 183. Input 3 'of charge controller 167 is connected to output 6' an intermediate voltage regulator 162. The input 4 'of the charge regulator 167 is connected to a voltage sensing element 54. The input 5' of the charge regulator 167 is connected to the output of the charging current measuring element 46. The input 6 'of the regulator 167 is connected to a voltage sensing element 110. Output 7 'charge regulator 167 is connected to input 77' of transistor 77 of converter 108. Output 8 'of charge regulator 167 is connected to input m 78 'of transistor 78 inverter 108.

In the integrated power generation system 201, a variable speed spinning drive motor 101 Ngm drives an electric generator 102. The speed of the drive motor 101 is controlled by a speed controller 161 by controlling the motor with an output signal Nd.

PL 228 281 B1 from exit 2 '. The minimum speed signal Nmin is applied to the input 3 'of the speed controller 161 and the speed signal Na measured by the sensor 112 to the input 5'. The motor speed is regulated in two zones. In the first zone, when the intermediate circuit voltage Vdcg measured with voltage measuring element 21 is greater than the set voltage Vdcg2r, the speed is stabilized according to the setpoint Nmin. In the second zone, the motor speed is controlled by the difference in the set voltage Vdcgr2 through the setter 172 and the measured voltage Vdcg with the voltage sensing element 21. The task of the intermediate voltage regulator 162 is to stabilize the intermediate voltage Vdcg according to the set value Vdcglr by adjusting the rectified generator current Idcg up to the maximum set value. Idcgr supplied by the referencing-unit 180. After reaching the current Idcg of the maximum value ldcgr, an increase in the intermediate circuit load causes a decrease in the voltage Vdcg causing the motor speed to increase through the operation of the speed regulator 161. Thus, when the voltage Vdcg drops below the reference value Vdcg2r, then the speed regulator reference signal is the difference setpoint voltage signals Vdcg2r and Vdcg. The reason for the decrease in the voltage Vdcg is the increase in the load. Thus, as the load increases, the speed of the drive motor increases, thereby increasing the voltage and power supplied by the generator, and thus the electric power generation circuit 151. The generator 102 produces a voltage vg with a frequency fg and powers the rectifier 7, which has a DC voltage at its output. proportional to speed. To the output of the rectifier 7, a converter 103 is connected via a current measuring element 23 to stabilize the voltage Vdcg of the intermediate circuit supplying the converter 104 producing the alternating voltage. The spatial vector modulation method is used to control the output voltage. The alternating output voltage Vacg is controlled by a voltage regulator 164 which receives a frequency command signal cogr from a reference device 175 and a voltage module command signal | vacgr1 | from a reference device 176. The feedback voltage signals vag, vbg, vcg are transmitted by the voltage measuring element 68. The output voltage is adjusted by adjusting the output current iga, igb, and igc in accordance with the set maximum values, igamr, igbmr, and igcmmr given by the adjuster 177. Intermediate voltage regulation Vdcg the speed control method is relatively slow and in the event of a jump in the load, the intermediate circuit voltage Vdcg drops faster than the speed increase, resulting in a stepwise reduction in the output voltage. To reduce the output voltage drop Vacg, power is drawn from the energy storage circuit 152. The intermediate voltage regulator 162 of the power generating circuit 151 controls the energy discharge process of the energy storage circuit 152, and the setter 84 controls the energy charging process of the energy storage circuit 152. Charging the energy storage 109 from the output. of the power generating circuit 151 is controlled by the set current signal kx1r from the charge current adjuster 84 after the condition that the voltage Vdcg is greater than the set voltage Vdcg4r is satisfied. The charging current adjuster 84 supplies the current regulator 163 with the signal of the active component of the commanded current, ikx1r, which, when summed with the reactive component of the current ikyr, given by the adjuster 178, is compared with the measured current values ika, ikab, ikc transformed into the rotating coordinate system taking into account the position angle. voltage vector ygu, and the outputs of the current regulator ikx and iky transformed in the adder 52 into a stationary coordinate system are converted into control signals of the converter 107. The charging current generator 84 receives the intermediate voltage command signal Vdcklr and the intermediate voltage signal Vdck measured by the voltage measuring element 54 energy storage circuit 152. A charge current command signal, ikxlr, is provided to the controller 163 only when the measured voltage Vdck is less than the command voltage Vdcklr. The converter 107 takes power from the AC circuit and supplies it to the converter 108 where transistor 77 controls the storage charging current 109 through inductor 49 and current sensing element 46. Charge controller 167 receives a voltage setpoint signal Vbr of energy storage 109 and a charge current signal Ib as measured with a current measuring element 46. The loading process of the magazine 109 is completed after it has been charged to a given voltage Vbr. The intermediate voltage regulator 162 acts as an intermediate voltage stabilizer Vdcg of the power generating circuit 151 by regulating the rectified current Idcg1 by regulating the speed of the generator and by controlling the energy storage circuit 152. In the event that the intermediate circuit voltage Vdcg is less than the value Vdcgr3 supplied by the referencing-unit 173 then at the output 7 'of the intermediate voltage regulator 162, an active-component signal ikx2r is fed to the current regulator 163. As a result of this signal, the current regulator 163 provides the signal ikx, which, after summing with the reactive component signal iky in the adder 52, controls the converter 107 receiving the active power from the circuit the intermediate voltage Vdck and supplying reactive power to the output of the power generating system 201. The intermediate voltage circuit Vdck is supplied from an energy store 109 controlled by a charge regulator 167 which receives a voltage command signal Vdck2r from an intermediate voltage regulator 162. Regu The charge generator 167 controls the current of inverter transistor 78 108 to maintain a predetermined voltage value Vdck2r. The feed-in from the energy storage circuit 152 to the output of the power generating circuit 201 is interrupted when the intermediate circuit voltage Vdcg1, as a result of the generator speed increase, becomes a value greater than the set value Vdcg3r.

Claims (2)

Patent claims 1.Integrated AC power converter system, comprising a motor connected to the speed controller and a shaft coupled to it generator, which is connected to an AC to AC voltage converter, consisting of an AC to DC converter in cascade, DC voltage converter permanently, a DC to AC converter connected to the current and voltage regulator, and its output is connected to a low-pass filter in the form of an induction coil connected to a capacitor and containing an energy storage unit with an AC voltage converter, characterized in that for connecting the inductor ( 105) with a capacitor (153) is connected successively via a voltage measuring element (68), a current measuring element (55) and an inductor (106) a DC-to-AC converter (107) with its AC-voltage output, which by its the DC input is connected to a DC to DC voltage converter (108) and has an energy store (109) connected via an inductor (49) and a current sensing element (46) with a voltage sensing element (110) connected in parallel. Integrated circuit according to claim 1, characterized in that the current sensing element (55) is connected to an input (7 ') of a current regulator (163), an energy storage circuit (152) whose input (4') is connected to an output ( 7 ') of the intermediate voltage regulator (162) of the power generating circuit (151), and the output (4') of the setter (84) of the power generating circuit (151) is connected to the input (1 ') of the current regulator (163) and the output (6) ') of the intermediate voltage regulator (162) is connected to the input (3') of the charge regulator (167) of the energy storage circuit (152) and that the output (3 ') of the setter (84) is connected to the input (1') of the charge regulator (167) ), and the output of the voltage sensing element (54) is connected to the input (5 ') of the intermediate voltage regulator (162) and to the input (5') of the setter (84) to the input (4 ') of the charge regulator (167), the output (7 ') of the voltage regulator (164) of the power generating circuit is connected to an input (2') of the current regulator (163) and to the input (3 ') of the adder (52).