WO2003098771A1 - Compensateur de tension en serie dynamique a commutateur statique de partage de courant - Google Patents

Compensateur de tension en serie dynamique a commutateur statique de partage de courant Download PDF

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Publication number
WO2003098771A1
WO2003098771A1 PCT/SG2002/000077 SG0200077W WO03098771A1 WO 2003098771 A1 WO2003098771 A1 WO 2003098771A1 SG 0200077 W SG0200077 W SG 0200077W WO 03098771 A1 WO03098771 A1 WO 03098771A1
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WO
WIPO (PCT)
Prior art keywords
voltage
current
static switch
series
current sharing
Prior art date
Application number
PCT/SG2002/000077
Other languages
English (en)
Inventor
Qun Li Hong
Pak Khian Hee
Siew Cheong Soh
Original Assignee
Sp Systems Pte Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sp Systems Pte Ltd filed Critical Sp Systems Pte Ltd
Priority to PCT/SG2002/000077 priority Critical patent/WO2003098771A1/fr
Priority to JP2004506153A priority patent/JP3954068B2/ja
Priority to AU2002258339A priority patent/AU2002258339B2/en
Priority to KR10-2004-7017586A priority patent/KR20050009994A/ko
Priority to CNB028288785A priority patent/CN100423396C/zh
Priority to NZ536200A priority patent/NZ536200A/en
Priority to MYPI20022093A priority patent/MY135118A/en
Priority to TW091112743A priority patent/TW571479B/zh
Publication of WO2003098771A1 publication Critical patent/WO2003098771A1/fr
Priority to HK05106696A priority patent/HK1073185A1/xx

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
    • H02J3/1807—Arrangements for adjusting, eliminating or compensating reactive power in networks using series compensators
    • H02J3/1814—Arrangements for adjusting, eliminating or compensating reactive power in networks using series compensators wherein al least one reactive element is actively controlled by a bridge converter, e.g. unified power flow controllers [UPFC]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/10—Flexible AC transmission systems [FACTS]

Definitions

  • This present invention relates generally to the field of alternating current (AC) electric power systems and electric power conversion systems, and in particular, to a system for correcting a voltage dip condition in a power line providing electric power to a load.
  • AC alternating current
  • electric power is typically generated by a generator and is transmitted through a transmission and distribution network to customer locations, where the electric power is fed to a load.
  • the supplied electric power should meet a number of requirements. Such requirements include that the voltage should be sinusoidal, the frequency should be 50 or 60 Hz, dependent on the country, and that the voltage amplitude should be of nominal value, with deviation within normal regulation.
  • Deviation by the voltage of the electrical power supply from the requirements may cause operational problems at the load.
  • one such deviation known as a voltage dip often causes the malfunction of equipment, and the shutdown of sophisticated manufacturing plants, or other industrial and commercial systems.
  • a voltage dip is a sudden and momentary reduction in the voltage of electric power supply, and is typically caused by a fault on the electric power system.
  • a voltage dip may also be caused by a load on the electric power system drawing a high current from the electric power system, creating a voltage drop across the impedance of the electric power system. This voltage drop appears as a voltage dip at the load.
  • the magnitude of the voltage dip will generally be different in each voltage of the 3 phases, although the duration of the voltage dip is typically approximately the same.
  • the injection transformer may have internal impedance that may cause additional voltage drop across the injection transformer during normal operation. This voltage drop may be overcome by configuring the inverter to output a voltage to compensate for the voltage drop during normal operation, but this causes a reduced operation efficiency of the apparatus disclosed.
  • UPSs has been used to compensate for voltage dips as well as voltage transients, voltage swells and drops.
  • UPSs normally consists of more switching devices, expensive controllers and huge energy storage units that make UPSs more expensive.
  • Such a UPS has a further limitation in that it normally operates at a lower efficiency.
  • the prior art thus fails to provide a lightweight, inexpensive and high efficient device to compensate for voltage dips that can cause malfunction and shutdown of industrial and commercial systems.
  • a dynamic series voltage compensator for compensating voltage dips in an alternating current electric power system
  • the dynamic series voltage compensator comprising: an energy storage unit for storing energy in the form of a DC voltage; a current sharing static switch connected between input and output terminals of the dynamic voltage compensator for selectively connecting the input and output terminals; a series injection inverter connected in parallel with the current sharing static switch for converting the DC voltage from the energy storage unit to AC voltage; and a system controller for detecting a voltage dip on the input terminal and for controlling the current sharing static switch and the series injection inverter wherein, with no voltage dip detected, the system controller controls the current sharing static switch to be conductive for at least part of a current cycle and controls the series injection inverter to conduct part of the current to the output terminals, and upon the system controller detecting a voltage dip, the system controller controls the current sharing static switch to open and controls the
  • the current sharing static switch comprises: anti-parallel connected thyristors; and a thyristor drive circuit for receiving a control signal from the system controller and for providing the anti-parallel connected thyristors with a firing signal in response to the control signal wherein, with no voltage dip detected, the system controller controls the thyristor drive circuit to provide the firing signal after a predetermined period after current through the current sharing static switch crosses zero.
  • the series injection inverter comprises a full bridge of switching devices, and while the current sharing static switch is controlled to be conductive, the switching devices are switched such that no voltage signal is injected between the input and output terminals.
  • FIG. 1 is a schematic block diagram illustrating a single-phase implementation of a dynamic series voltage compensator with a current sharing static switch, and the manner in which the dynamic series voltage compensator is connected in an application circuit;
  • FIG. 2 is a detailed schematic diagram of the dynamic series voltage compensator;
  • FIG. 3 is a detailed schematic diagram of a system controller of the dynamic series voltage compensator
  • FIG. 4 is a schematic block diagram illustrating a three-phase implementation of a dynamic series voltage compensator with current sharing static switch
  • FIG. 5 A shows an oscillogram of a typical voltage dip from the AC power source
  • FIG. 5B shows an oscillogram of the output voltage of the single-phase dynamic series voltage compensator during the voltage dip illustrated in Fig. 5 A;
  • FIG. 6A shows an oscillogram of a typical voltage dip from a three-phase AC power source
  • FIG. 6B shows an oscillogram of the output voltages of the three-phase dynamic voltage compensator during the voltage dip illustrated in Fig. 6A.
  • FIG. 1 is a schematic diagram illustrating a single-phase implementation of a dynamic series voltage compensator 100 connected between an AC power source 105 and an AC load 106.
  • the dynamic series voltage compensator 100 is operable to compensate for voltage dips in the supply voltage from the AC power source 105.
  • a waveform 121 of a typical voltage dip is also illustrated.
  • the dynamic series voltage compensator 100 may also be employed in a multi-phase system to compensate for voltage dips on the supply voltages from the respective supply phases of such a multiphase system.
  • a three-phase implementation of the dynamic series voltage compensator 100 is illustrated in, and is described with reference to, FIG. 4.
  • the dynamic series voltage compensator 100 of the preferred embodiment includes a current sharing static switch 101, a series injection inverter 102, a system controller 103 for controlling the current sharing static switch 101 and the series injection inverter 102, and an energy storage unit 104 for providing energy in the form of direct current (DC) voltage to the series injection inverter 102.
  • the energy storage unit 104 may be formed from an ultra capacitor, a flywheel system, a battery or any other means that can provide energy in the form of DC voltage.
  • the current sharing static switch 101 is connected in parallel to the series injection inverter 102, and both are connected between the AC power source 105 and load 106 through wires 107 and 108 respectively.
  • a neutral wire 109 is provided as return path.
  • the energy storage unit 104 provides the DC voltage to the series injection inverter 102 though wires 116 and 117.
  • the system controller 103 and energy storage unit 104 are also connected to the neutral wire 109, from which a reference voltage is acquired.
  • the system controller 103 obtains an input voltage signal to the dynamic series voltage compensator 100 from wire 107, obtains an output voltage signal of the dynamic voltage compensator 100 from wire 108, obtains a current signal though signal wire 115 of the current through the current sharing static switch 101 measured with a current sensor 118, obtains a current signal through signal wire 120 of the current through the series injection inverter 102 measured with a current sensor 119, and obtains a DC bus voltage of serial injection inverter 102 through signal wire 110 and signal wire 111.
  • the system controller 103 controls the current sharing static switch 101 through control line 114, and controls the serial injection inverter through control lines 112 and 113.
  • the system controller 103 controls the current sharing static switch 101 and the series injection inverter 102 such that the current to the load 106 is shared by the current sharing static switch 101 and the series injection inverter 102.
  • the normal operation condition is also referred to hereinafter as the current sharing mode.
  • the system controller 103 When the system controller 103 detects a voltage dip from the AC power source 105 by more than the predefined limits, which is detected through the measurement of the voltage on wire 107, the system controller 103 controls the current sharing static switch 101 to open and the series injection inverter 102 to inject energy between terminals 107 and 108 so that AC power at or near the nominal voltage level is provided to the load 106.
  • the dynamic series voltage compensator 100, and in particular the series injection inverter 102 thus injects voltage between wire 107 and wire 108 so that the load 106 receives a dip free supply, as is illustrated by waveform 122.
  • FIG. 1 A more detailed schematic diagram of the dynamic series voltage compensator 100 illustrated in FIG. 1 is illustrated in, and is described with reference to, FIG. 2. In particular, more detail is shown of the current sharing static switch 101 and the series injection inverter 102. The connections to and from the system controller 103 and the energy storage unit 104 are also illustrated.
  • the current sharing static switch 101 includes anti parallel-connected thyristors 210 and 211, and a thyristor drive circuit 212.
  • the thyristor drive circuit 212 receives a control signal from controller 103 through control line 114. When the control signal on control line 114 is 'HIGH', the thyristor drive circuit 212 provides thyristors 210 and 211 with firing signals so that each of thyristors 210 and 211 becomes conductive while respective proper voltage polarity is applied.
  • the series injection inverter 102 includes a full bridge of switching devices 200, bridge drive units 205 and 206, a switching harmonics filter, and DC bus capacitor 209 connected over the DC supply voltage supplied from the energy storage unit 104 over lines 116 and 117.
  • the full bridge of switching devices 200 consists of 4 Insulated-Gate- Bipolar-Transistors (IGBT) with anti-parallel connected freewheeling diodes 201, 202, 203 and 204.
  • the switching harmonics filter consists of a series connected inductor 208 and capacitor 207, and is connected between the output terminals of the full bridge of switching devices 200, with the inductor 208 being connected to the positive output terminal '+' and the capacitor 207 being connected to the negative output terminal '-'.
  • connection point between the capacitor 207 and inductor 208 is connected to wire 108 for forming the output terminal of the series injection inverter, whereas the negative output terminal of the full bridge of switching devices 200 is connected to wire 107 forming the input terminal of the series injection inverter.
  • the series injection inverter 102 receives control signals from the system controller 103 over control lines 112 and 113.
  • control signal on control line 112 is 'HIGH'
  • IGBT 203 is in a conductive mode
  • control signal on control line 113 is 'HIGH'
  • IGBT 201 is in a conductive mode
  • IGBT 202 is in a cut-off mode, and vice versa.
  • the system controller 103 measures the DC bus voltage supplied by the energy storage unit 104 to the series injection inverter 102 through lines 110 and 111 connected to lines 116 and 117.
  • FIG. 3 is a more detailed schematic diagram of the system controller 103 of the dynamic series voltage compensator 100.
  • the schematic diagram of FIG. 3 shows a digital circuit implementation of the system controller 103, the system controller 103 may also be implemented in an analog circuit or in a combination of a digital circuit and an analog circuit.
  • the system controller 103 receives 5 inputs, those being: the input voltage signal to the dynamic voltage compensator 100 obtained from wire 107; the output voltage signal of the dynamic voltage compensator 100 obtained from wire 108; the current through the current sharing static switch 101 measured by current sensor 118 and provided through signal wire 115; the current through the series injection inverter 102 measured by current sensor 119 and provided to the system controller 103 through signal wire 120; and the DC bus voltage of the series injection inverter 102 which is the difference in the voltages received through signal wire 110 and signal wire 111, and is obtained by passing the voltages received through signal wire 110 and signal wire 111 through a differential attenuation circuit 306.
  • Each of these inputs which are in analogue form, is converted to digital form by analogue-to-digital (A/D) converters 301, 302, 303, 305 and 304 respectively.
  • A/D analogue-to-digital
  • the digital signal of the input voltage signal to the dynamic series voltage compensator 100 is pre-processed by digital filter 307.
  • the outputs of the system controller 103 are the control signal to IGBT 201 and IGBT 202 which is output through control line 113, the control signal to IGBT 203 and IGBT 204 which is output through control line 112, and the control signal to the thyristor drive circuit 212 of the current sharing static switch 101 which is output through control line 114.
  • the neutral wire 109 is connected to the internal ground of the system controller 103 and is indicated by 327 in FIG. 3.
  • An over-current detection block 314 receives as inputs the digital version of the current through the current sharing static switch 101 and the digital version of the current through the series injection inverter 102, and determines whether an over-current condition exists. When the over-current detection block 314 determines that the current through either of the current sharing static switch 101 (FIG. 2) or the series injection inverter 102 is higher than the capability of the IGBTs of the full bridge of switching devices 200, the over-current detection block 314 outputs a 'LOW' signal though signal wire 360. The signal on signal wire 360 is normally 'HIGH'.
  • a 'LOW' signal on signal wire 360 keeps or turns the current sharing static switch 101 ON" through NAND gate 321 and turns IGBTs 201 and 203 'OFF' and IGBTs 202 and 204 'ON' by feeding a 'LOW' signal to control lines 112 and 113 through AND gates 324a and 324b.
  • the current sharing static switch 101 is forced into conductive mode while the series injection inverter 102 does not inject any energy between wire 107 and wire 108.
  • the dynamic series voltage compensator 100 does not compensate for a voltage dip under the over-current condition.
  • the filtered digital signal of the input voltage to the dynamic series voltage compensator 100 is sent to a reference table-updating block 308.
  • the reference table-updating block 308 is controlled by a signal on signal wire 345.
  • the reference table-updating block 308 continuously updates a reference signal table which stores a digital representation of the input voltage on wire 107.
  • the reference table-updating block 308 freezes the available reference signal table.
  • the reference table-updating block 308 generates a reference signal, which is feed to a dip detection block 309 via signal wire 362 for detecting a voltage dip condition, and also to subtracters 310 and 311 via signal line 341 for generating an injection voltage signal.
  • Subtracter 310 calculates the difference between the reference signal on signal wire 341 and the filtered digital signal of the input voltage on wire 107 via signal wire 340.
  • Subtracter 311 calculates the difference between the reference signal on signal line 341 and the digital signal of the output voltage on signal line 342, which is then adjusted through PI control 312.
  • the sum of outputs from subtracter 310 and PI control 312, calculated by adder 313, is then provided as input to pulse width modulation (PWM) generator 318.
  • PWM pulse width modulation
  • the PWM generator 318 makes use of the DC bus voltage of the series injection inverter 102 from A/D converter 304 in generating PWM switching signals on signal wire 343 and signal wire 344.
  • the dip detection block 309 receives as inputs the filtered digital signal of the input voltage on wire 107 via signal line 340, the reference signal from the reference table-updating block 308, the digital signal of the output voltage on wire 108 via signal line 342, and the digital version of the current through the current sharing static switch 101 via signal wire 346, and determines from those inputs whether a voltage dip occurred, what kind of force commutation should be applied and whether the force commutation is completed.
  • the dip detection block 309 generates a conduction angle control signal as output provided on signal wire 353 to current sharing static switch 101 through NAND gate 326 and NAND gate 321, and also a two-bit signal as output provided on signal wires 351 and 352 to block 315.
  • the dip detection block 309 only determines whether a voltage dip occurred when the instantaneous value of reference signal from the reference table-updating block 308 is higher than 30% of a peak value stored.
  • the conduction angle control signal on line 353 is set to 'HIGH' when a predefined delay elapsed after each zero crossing of the current.
  • the conduction angle control signal is set to 'LOW' again before a following zero crossing of the current.
  • the conduction angle control signal on signal wire 353 is always set to 'HIGH'.
  • Block 315 decodes the two-bit signal received from the dip detection block 309 into four signals provided on signal wires 350, 349, 348 and 347.
  • the signal on signal line 350 is set to 'HIGH'; and the other three signals are set to 'LOW'.
  • the signal on signal line 349 is set to 'HIGH'; and the other three signals are set to 'LOW'.
  • the signal on signal line 348 is set to 'HIGH'; and the other tliree signals are set to 'LOW'.
  • the signal on signal line 347 is set to 'HIGH'; and the other three signals are set to 'LOW'.
  • dip detection block 309 When the difference between the reference signal provided on signal wire 362 and the filtered digital signal of the input voltage provided on signal wire 340 is larger than a predefined setting, and the digital version of the current through the current sharing static • switch 101 is negative, then dip detection block 309 generates the two bit signal '00'.
  • the two-bit signal '00' indicates that a positive force commutation (Positive FC) is required.
  • dip detection block 309 When the difference between the reference signal provided on signal wire 362 and the filtered digital signal of the input voltage provided on signal wire 340 is larger than a predefined setting, and the digital version of the current through the current sharing static switch 101 is positive, then dip detection block 309 generates the two bit signal '01 '.
  • the two-bit signal '01' indicates that a negative force commutation (Negative FC) is required.
  • the dip detection block 309 When the difference between the reference signal provided on signal wire 362 and the filtered digital signal of the input voltage provided on signal wire 340 is larger than the predefined setting, and a zero crossing of the digital version of the current through the current sharing static switch 101 is detected, the dip detection block 309 generates the two bit signal '11'.
  • the two-bit signal '11' indicates that force commutation is completed and series voltage injection could be started.
  • This state typically follows one of the above states in which two-bit signals '00' or '01' is generated.
  • dip detection block 309 generates the two bit signal '10', which indicates that no dip compensation is required and referred to as the toggling state.
  • the signal on signal wire 348 is set to 'HIGH'; and the other three signals are set to 'LOW' by block 315, causing the output of OR gate 316 to be 'LOW'.
  • the signal on signal wire 345 is also 'LOW' and the reference table-updating block 308 continuously updates a reference signal table.
  • the output of OR gate 316 is inverted by an INVERT gate 325 before being fed to the AND gate 326 with the conduction angle control signal on line 353.
  • the output of the INNERT gate 325 provided on signal wire 361 is 'HIGH'.
  • the state of the signal on line 114 will be that of the conduction angle signal on signal wire 353.
  • control line 114 is forced 'HIGH', and the thyristor drive circuit 212 provides thyristors 210 and 211 with firing signals.
  • any one of the signals on signal lines 350, 349 or 347 is high, which occurs when dip detection block 309 detects a voltage dip and generates the two bit signal '00', '01, or '11' respectively, the output of OR gate 316 is 'HIGH', the signal on signal wire 361 is 'LOW'.
  • control line 114 In the absence of an over-current condition, when a voltage dip is detected control line 114 is forced 'LOW' irrespective of the state of the conduction angle control signal on signal wire 353, and the thyristor drive circuit 212 does not provide thyristors 210 and 211 with firing signals. Also, the signal on signal wire 345 is 'HIGH', and the reference table-updating block 308 freezes the available reference signal table.
  • the current sharing static switch 101 is turned 'OFF' when a voltage dip is detected and the current through the current sharing static switch 101 has crossed zero.
  • the current sharing static switch 101 is turned or kept 'ON' when an over- current condition is detected; or when no dip compensation is required and the phase of current is in the conduction phase angle. In current sharing mode, the static current sharing switch 101 is only turn 'ON' when the phase of current is in the conduction phase angle.
  • the signal on signal wire 350 is set to 'HIGH'.
  • IGBT 201 is turned 'ON', while IGBT 202 is turned 'OFF'.
  • the signals on signal wires 347 and 348 being 'LOW'
  • the outputs of AND gates 320a and 319 are 'LOW'
  • the signal on signal wire 350 'LOW' the signal on line 358, after OR gate 322, is also 'LOW'.
  • the signal on line 112 is forced 'LOW' by AND gate 324a, and IGBT 204 is turned 'ON', and IGBT 203 is turned 'OFF'.
  • the two-bit signal is ' 11 ' for dip compensation.
  • the signal on signal line 347 is set 'HIGH' and the other 3 output signals of block 315 are set low.
  • the PWM switching signals on signal wires 343 and 344 generated by PWM generator 318 are switched to control lines 112 and 113 respectively.
  • the IGBTs 201, 202, 203 and 204 of the full bridge of switching devices 200 are controlled by the PWM switching signals to generate an PWM output which, after the filtering provided by inductor 208 and capacitor 207, results in a required sinusoidal signal that makes the output voltage of the dynamic voltage compensator on line 108 dip free.
  • the toggle state the two-bit signal is '10', and the signal on signal wire 348 is set to 'HIGH'.
  • the output of AND gate 319 provided on signal wire 354 is that state of the toggle signal.
  • the outputs of OR gates 322 and 323 also toggles with the toggle signal. In the absence of an over-current condition, the outputs of AND gates 324a and 324b also toggles, which in turn toggles control lines 112 and 113.
  • the current sharing static switch 101 is non-conductive and the load current flows though the inverter 102 that is in short circuit mode.
  • the conduction angle control signal on line 353 is set to 'HIGH' following the predefined delay, the current sharing static switch 101 is conductive and the load current flows though current sharing static switch 101.
  • the dynamic series voltage compensator 100 proves the switching functionality of the current sharing static switch 101 and switching devices 201, 202, 203 and 204 of series injection inverter 102 during such no voltage dip periods.
  • the switching functionality of the current sharing static switch 101 is proven through the conduction angle control, while the switching functionality of the switching devices 201, 202, 203 and 204 is proven by the toggle switching.
  • the frequency of the toggle switching is controlled by the frequency of the signal of block 317, which is determined according to how often the switching functionality of the switching devices 201, 202, 203 and 204 is to be proven. In a preferred implementation, the toggling frequency is 0.1 Hz.
  • FIG. 4 is a schematic block diagram illustrating a three-phase implementation of a dynamic voltage compensator with a current sharing static switch.
  • three single- phase implementations of the dynamic voltage compensator with current sharing static switch illustrated in FIG. 2 are combined to form the three-phase dynamic voltage compensator.
  • control lines, signal lines, the energy storage units and series injection inverters for phase-b and phase-c are not illustrated.
  • tliree independent system controllers may be used in the three-phase implementation of the dynamic series voltage compensator, typically a single controller is used to control the three series injection inverters and the three current sharing static switches using the principles described in relation to FIG. 3.
  • FIG. 5 A shows an oscillogram 501 of a typical voltage dip from the AC power source 105 (FIG. 1) on wire 107.
  • FIG. 5B shows an oscillogram 502 of the output voltage of the single-phase dynamic series voltage compensator 100 on wire 108 during the voltage dip illustrated in Fig. 5 A.
  • FIG. 6A shows an oscillogram 601 of a typical voltage dip from a three-phase AC power source 105
  • FIG. 6B shows an oscillogram 602 of the output voltages of the three-phase dynamic series voltage compensator (FIG. 4) during the voltage dip illustrated in Fig. 6A.
  • the voltage dip appearing in the input voltages 501 and 602 are compensated so that the output voltages 502 and 602 are dip free.
  • the advantages of the embodiments of the invention are manifold.
  • One advantage is that in the current sharing mode or when there is no voltage dip from the AC power source 105, the load current is shared by the current sharing static switch 101 and the series injection inverter 102. As the main fraction of the load current flows through the current sharing static switch 101 whose voltage drop in conductive mode is very small (less than 1 V), there is no obvious voltage drop between the input and the output of the dynamic series voltage compensator 100.
  • Yet a further advantage of the embodiments of the invention is that in the current sharing mode or when there is no voltage dip from the AC power source 105, the switching functionality of the switching devices 201, 202, 203, 204, 210 and 211 of the inverter 102 and the current sharing static switch 101 is proved through toggling switch and conduction angle control continuously.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Inverter Devices (AREA)
  • Supply And Distribution Of Alternating Current (AREA)
  • Control Of Electrical Variables (AREA)

Abstract

La présente invention a trait à un compensateur de tension en série dynamique (100) destiné à compenser les chutes de tension dans une ligne d'énergie électrique. Le compensateur (100) comporte un commutateur statique de partage de courant (101), un onduleur à injection en série (102), une unité de stockage d'énergie (104) et un contrôleur de système (103). Le commutateur statique de partage de courant (101) comporte une paire de thyristors parallèles (210) et (211). L'onduleur à injection en série (102) comporte quatre transistors bipolaires à porte isolée (201), (202), (203) et (204) qui constituent un pont complet de dispositifs de commutation (200). Le contrôleur de système (103) contrôle la tension d'entrée en vue de déterminer si une compensation de tension est requise et contrôle la sortie en vue de déterminer la quantité de compensation requise. Lors du fonctionnement normal de la ligne d'énergie électrique, c'est à dire lorsqu'une compensation de tension n'est pas nécessaire, le courant de charge est partagé entre le commutateur statique de partage de courant (101) et l'onduleur à injection en série (102) par le contrôle d'un angle de conduction des thyristors (210) et (211). Lorsque le commutateur statique de partage de courant (101) est à l'état passant, l'onduleur (102) est également commandé pour réaliser une commutation en basculement de sorte qu'aucune compensation de tension de soit effectuée. La commutation en basculement de l'onduleur à injection en série (102) et le contrôle de l'angle de conduction du commutateur statique de partage de courant (101) sont utilisés pour établir la fonctionnalité des dispositifs de commutation de l'onduleur (102) et du commutateur statique de partage de courant (101). Lors d'une chute de tension dans la ligne d'énergie électrique, le commutateur statique de partage de courant (101) est immédiatement bloqué par commutation forcée, et l'onduleur (102) effectue la compensation. Etant donné que la chute de tension à travers le compensateur (100) est contrôlé à une valeur très basse lors du fonctionnement normal de la ligne d'énergie électrique, le compensateur (100) présente une efficacité de fonctionnement très élevée. En raison de la petite quantité de courant circulant à travers l'onduleur (102) lors du fonctionnement normal de la ligne d'énergie électrique, les dispositifs de commutation (201), (202), (203) et (204) et le filtre (207) et (208) de l'onduleur (102) peuvent être de régime faible. Ainsi on obtient un compensateur de tension en série dynamique léger et de petite dimension à efficacité élevée.
PCT/SG2002/000077 2002-05-02 2002-05-02 Compensateur de tension en serie dynamique a commutateur statique de partage de courant WO2003098771A1 (fr)

Priority Applications (9)

Application Number Priority Date Filing Date Title
PCT/SG2002/000077 WO2003098771A1 (fr) 2002-05-02 2002-05-02 Compensateur de tension en serie dynamique a commutateur statique de partage de courant
JP2004506153A JP3954068B2 (ja) 2002-05-02 2002-05-02 電流分担スタティックスイッチを持つダイナミック直列電圧補償器
AU2002258339A AU2002258339B2 (en) 2002-05-02 Dynamic series voltage compensator with current sharing static switch
KR10-2004-7017586A KR20050009994A (ko) 2002-05-02 2002-05-02 전류 공유 정지 스위치를 갖는 다이내믹 직렬 전압 보상기
CNB028288785A CN100423396C (zh) 2002-05-02 2002-05-02 带有电流共享静态开关的动态串联电压补偿器
NZ536200A NZ536200A (en) 2002-05-02 2002-05-02 Dynamic series voltage compensator with current sharing static switch, an injection inverter, energy storage unit and a system controller
MYPI20022093A MY135118A (en) 2002-05-02 2002-06-06 Dynamic series voltage compensator with current sharing static switch
TW091112743A TW571479B (en) 2002-05-02 2002-06-12 Dynamic series voltage compensator with current sharing static switch
HK05106696A HK1073185A1 (en) 2002-05-02 2005-08-04 Dynamic series voltage compensator with current sharing static switch

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WO2013153075A3 (fr) * 2012-04-10 2014-04-17 The University Of Hong Kong Compensateur de puissance
CN107706924A (zh) * 2017-10-23 2018-02-16 衢州学院 一种串联型动态电压补偿器
WO2018041363A1 (fr) * 2016-09-02 2018-03-08 Siemens Aktiengesellschaft Dispositif de stabilisation dynamique de la transmission d'énergie par une ligne électrique
CN109361213A (zh) * 2018-11-23 2019-02-19 南京南瑞继保电气有限公司 一种混合直流输电系统串联换流器退出装置及方法
FR3083020A1 (fr) * 2018-06-26 2019-12-27 Ge Energy Power Conversion Technology Limited Systeme de compensation de tension pour circuit de distribution d'energie electrique multiphasee
CN111799796A (zh) * 2020-07-02 2020-10-20 云南电网有限责任公司电力科学研究院 一种h桥级联型静止同步补偿器的输出谐波抑制方法
CN114447936A (zh) * 2021-12-24 2022-05-06 致瞻科技(上海)有限公司 一种新型的碳化硅器件动态电压补偿方法

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TWI453432B (zh) * 2012-11-28 2014-09-21 Simplo Technology Co Ltd 絕緣偵測電路及其方法
CN104659899B (zh) * 2014-12-29 2018-08-21 西安华为技术有限公司 一种均流方法、装置及系统
CN106849103A (zh) * 2017-03-03 2017-06-13 上海交通大学 基于直流调制的无变压器式单相动态电压补偿器
TWI692181B (zh) 2018-10-16 2020-04-21 財團法人工業技術研究院 電力調節系統與電力調節方法
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CN100375363C (zh) * 2006-04-07 2008-03-12 北京四方清能电气电子有限公司 一种为串联补偿设备提供电流回路的装置
WO2013153075A3 (fr) * 2012-04-10 2014-04-17 The University Of Hong Kong Compensateur de puissance
US10790666B2 (en) 2012-04-10 2020-09-29 Versitech Limited Power compensator
WO2018041363A1 (fr) * 2016-09-02 2018-03-08 Siemens Aktiengesellschaft Dispositif de stabilisation dynamique de la transmission d'énergie par une ligne électrique
EP3485551B1 (fr) 2016-09-02 2022-01-12 Siemens Energy Global GmbH & Co. KG Dispositif de stabilisation dynamique de la transmission d'énergie par une ligne électrique
CN107706924A (zh) * 2017-10-23 2018-02-16 衢州学院 一种串联型动态电压补偿器
FR3083020A1 (fr) * 2018-06-26 2019-12-27 Ge Energy Power Conversion Technology Limited Systeme de compensation de tension pour circuit de distribution d'energie electrique multiphasee
CN109361213A (zh) * 2018-11-23 2019-02-19 南京南瑞继保电气有限公司 一种混合直流输电系统串联换流器退出装置及方法
CN109361213B (zh) * 2018-11-23 2022-03-29 南京南瑞继保电气有限公司 一种混合直流输电系统串联换流器退出装置及方法
CN111799796A (zh) * 2020-07-02 2020-10-20 云南电网有限责任公司电力科学研究院 一种h桥级联型静止同步补偿器的输出谐波抑制方法
CN111799796B (zh) * 2020-07-02 2023-11-17 云南电网有限责任公司电力科学研究院 一种h桥级联型静止同步补偿器的输出谐波抑制方法
CN114447936A (zh) * 2021-12-24 2022-05-06 致瞻科技(上海)有限公司 一种新型的碳化硅器件动态电压补偿方法
CN114447936B (zh) * 2021-12-24 2022-12-09 致瞻科技(上海)有限公司 一种碳化硅器件动态电压补偿方法

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CN100423396C (zh) 2008-10-01
HK1073185A1 (en) 2005-09-23
AU2002258339A1 (en) 2003-12-02
JP2005525078A (ja) 2005-08-18
TW571479B (en) 2004-01-11
JP3954068B2 (ja) 2007-08-08
KR20050009994A (ko) 2005-01-26
NZ536200A (en) 2006-09-29
CN1625824A (zh) 2005-06-08
MY135118A (en) 2008-02-29

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