CN1625824A - Dyamic series voltage compensator with current sharing static switch - Google Patents
Dyamic series voltage compensator with current sharing static switch Download PDFInfo
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- CN1625824A CN1625824A CNA028288785A CN02828878A CN1625824A CN 1625824 A CN1625824 A CN 1625824A CN A028288785 A CNA028288785 A CN A028288785A CN 02828878 A CN02828878 A CN 02828878A CN 1625824 A CN1625824 A CN 1625824A
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- 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
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- 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
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- 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]
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- 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]
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Abstract
A dynamic series voltage compensator (IOO) for compensating voltage dips in a power line is described. The compensator includes a current sharing static switch, a series injection inverter, an energy storage unit and a system controller. The current sharing static switch includes a pair of anti-parallel thyristors. The series injection inverter includes 4 IGBTs, that form a full bridge of switching devices. The system controller monitors the input voltage to determine if voltage compensation is required and monitors the output to determine how much compensation is required. Under normal power line operating condition, that is when no voltage compensation is required, the load current is shared between the current sharing static switch and the series injection inverter by controlling the conduction angle of thyristors. While the current sharing static switch is conductive, the inverter is also controlled to do toggle switching such that no voltage compensation is performed.
Description
Technical field
The present invention relates to the field of alternating current (AC) electric power system and electric power coversion system, especially, relate to a system that is used in the power circuit bucking voltage rapid drawdown situation that electric power is provided to a load.
Background technology
In an electric power system, generally be to produce electric power, and be transported to customer site by a transmission and distribution network by a generator, state electric power in this place and be fed into load.Usually, the electric power that is supplied to should meet ask for something.These requirements comprise that described voltage should be sinusoidal, and according to different countries, described frequency should be 50 or 60Hz, and the amplitude of described voltage should be a rated value, and deviation should be within normal regulation.
The voltage of described supply of electric power deviates from the operation troubles that can cause described load in the deviation of described requirement.Especially, such deviation is exactly a voltage collapse, causes equipment fault through regular meeting, and large-scale factory, or the shut-down of other industry and business system.Voltage collapse is that of voltage of supply of electric power is unexpected, the minimizing of moment, typically, is caused by the fault of electric power system.Voltage collapse may be caused that also this load is extracted a high electric current from described electric power system by a load in the described electric power system, produces voltage and descend in the impedance of described electric power system.This voltage descends, and appears in the load with a voltage collapse.In a three-phase electrical power system, though the duration of described voltage collapse is substantially the same, the magnitude of described voltage collapse is generally all different at each voltage of three-phase.
Some power conversions and control method or voltage compensator are developed out, with the bucking voltage rapid drawdown.People's such as Gyugyi U.S. Patent number 5,329,222 discloses a kind of technology that is used for the bucking voltage rapid drawdown.This patent has been described apparatus and method, with a series connection input voltage, compensate line transient state, this series connection input voltage is generated by a three-phase inverter that has conventional DC (DC) bus, and by a coupling input transformer and the coupling of described three-phase power circuit.Yet,, use described three-phase inverter and the input transformer that has an one common DC bus just improper if be applied in the low voltage electric power system.This is the expense height because of described coupling input transformer, and described input transformer is very heavy, and its area occupied is very big.And described input transformer has inherent impedance, and this can cause the extra voltage on described input transformer to descend in operate as normal.This voltage descends and can overcome, and, exports a voltage with the voltage decline of compensation in normal work period by setting described inverter that is, and still, this causes the operating efficiency of disclosed device to descend.
People's such as Cheng U.S. Patent number 5,883,796 discloses another technology of bucking voltage rapid drawdown.This patent has been described apparatus and method, uses a three-phase inverter and a coupling input transformer of having common DC bus to repair voltage collapse.Therefore, this equipment and method and at U.S. Patent number 5,329, that describes in 222 has a similar limitation, because high operating efficiency and the low voltage on described input transformer descend, can not obtain simultaneously.
The International Publication No. PCT/SG00/00057 of SP System discloses the technology of another kind of bucking voltage rapid drawdown.It discloses a kind of apparatus and method, is applicable in low voltage electric power system the bucking voltage rapid drawdown.In this method, independently inverter each of power circuit that is directly connected to load goes up mutually.Because do not use the coupling input transformer, so, the expense of described compensator, it is minimum that weight and area occupied can be reduced to.
People's such as Divan U.S. Patent number 6,118,676 discloses another technology of bucking voltage rapid drawdown.This patent has been described apparatus and method, and the energy that use stems from the residual voltage of power circuit described in the described voltage collapse process comes the bucking voltage rapid drawdown.Yet when in described voltage collapse process, the energy of the residual voltage of described power circuit is very low, the perhaps degree of depth height of described voltage collapse, and this method is difficult to obtain enough energy and realizes described compensation.And in voltage collapse and rapid drawdown recovery, transient current may extract from described supply of electric power.The described power transferring method of this patent uses half-bridge inverter, for the output voltage of same amount, and the DC bus voltage that half-bridge inverter need be higher than full-bridge inverter.
Except above-mentioned voltage compensator, uninterrupted power supply (ups) Unity is used to bucking voltage rapid drawdown and voltage transient, voltage swells and decline.But UPS generally includes more conversion equipment, and expensive controller and huge energy storage units make UPS expensive more.Such UPS has further limitation, is that its general work efficient is lower.
Therefore, current techniques do not have to provide one light, cheap and high efficiency equipment compensate the voltage collapse that may cause industry and business system fault or close.
Summary of the invention
An object of the present invention is to overcome basically, or improve one or more shortcomings of existing equipment at least.
According to an aspect of the present invention, provide a kind of dynamic series voltage compensator, be used for bucking voltage rapid drawdown in an alternating current electric power system, described dynamic series voltage compensator comprises:
An energy storage units is used for the form stored energy with direct voltage;
An electric current is shared static switch, is connected between the input and output terminal of described dynamic series voltage compensator, is used for connecting selectively described input and output terminal;
A series connection input inverter is shared static switch with described electric current and is connected in parallel, be used for changing come from described energy storage units described direct voltage to alternating voltage; And
A system controller, be used for detecting the voltage collapse on described input terminal, control described electric current and share static switch and described series connection input inverter, wherein, when not detecting voltage collapse, it is conduction state that described system controller is controlled the shared static switch of described electric current, continue at least a portion of a current cycle, and control described series connection input inverter and conduct a part of described electric current to described outlet terminal, and in case described system controller detects a voltage collapse, it is non-conductive state that described system controller is controlled the shared static switch of described electric current, and control described series connection input inverter and between described input and output terminal, import a voltage signal, to compensate described voltage collapse.
Preferably, the shared static switch of described electric current comprises:
The thyristor that antiparallel connects; And
A thyristor driving circuit, be used for receiving a control signal from described system controller, be used for providing discharge signal to respond described control signal to the thyristor that described antiparallel connects, wherein, when not detecting voltage collapse, described system controller is controlled described thyristor driving circuit after one period scheduled time after the electric current friendship zero of the shared static switch of described electric current of flowing through, and described discharge signal is provided.
Preferably, described series connection input inverter comprises a full electric bridge of conversion equipment, and shares static switch when described electric current and be controlled as when conducting electricity, and described conversion equipment is converted and makes do not import any voltage signal between described input and output terminal.
Description of drawings
Embodiments of the invention will be elaborated in conjunction with the accompanying drawings, wherein:
Fig. 1 has shown the single-phase embodiment of a dynamic series voltage compensator that has the shared static switch of an electric current and the schematic block diagram of the connected mode of described dynamic series voltage compensator in an application circuit;
Fig. 2 has shown the detailed maps of described dynamic series voltage compensator;
Fig. 3 has shown the detailed maps of a system controller of described dynamic series voltage compensator;
Fig. 4 has shown the schematic block diagram of the three-phase embodiment of a dynamic series voltage compensator that has the shared static switch of electric current;
Fig. 5 A has shown the oscillogram of a typical voltage collapse of described AC power supplies;
Fig. 5 B has shown during the voltage collapse shown in Fig. 5 A, the oscillogram of the output voltage of described single-phase dynamic series voltage compensator;
Fig. 6 A has shown the oscillogram of a typical voltage collapse that comes from the three-phase AC power supplies;
Fig. 6 B has shown during the voltage collapse shown in Fig. 6 A, the oscillogram of the output voltage of described three phase dynamic series voltage compensator.
Embodiment
The feature of mentioning in any one or more accompanying drawings has same reference numerals, just has identical functions or operation in description, unless opposite intention occurs.
Fig. 1 has shown the schematic diagram of the single-phase embodiment of a dynamic series voltage compensator 100, and described compensator 100 is connected between an AC power supplies 105 and the AC load 106.Described dynamic series voltage compensator 100 can compensate the voltage collapse of the supply voltage of described AC power supplies 105.The waveform 121 of a typical voltage collapse also is shown.Described dynamic series voltage compensator 100 also can make the voltage collapse of the supply voltage of each supply phase that is used for compensating such polyphase system in polyphase system.The three-phase embodiment of described dynamic series voltage compensator 100 is shown, and is described in conjunction with Fig. 4.
With reference to figure 1, the described dynamic series voltage compensator 100 of the preferred embodiment comprises that an electric current shares static switch 101, a series connection input inverter 102, a system controller 103, be used for controlling described electric current and share static switch 101 and described series connection input inverter 102, and an energy storage units 104, this unit is used for providing energy to described series connection input inverter 102 with the form of direct current (DC) voltage.Described energy storage units 104 can be by a ultra-high capacity, a fly wheel system, and a battery or other any devices of energy that can provide with the form of dc voltage constitute.
Described electric current is shared static switch 101 and is connected in parallel with described series connection input inverter 102, and they all are connected between described AC power supplies 105 and the load 106 by electric wire 107 and 108 respectively.Article one, center line 109 has served as the loop.Described energy storage units 104 provides dc voltage by electric wire 116 and 117 to described series connection input inverter 102.Described system controller 103 and energy storage units 104 also are connected to described center line 109, obtain a reference voltage therefrom.
Described system controller 103 obtains a input voltage signal to described dynamic series voltage compensator 100 from electric wire 107; Obtain an output voltage signal of described dynamic voltage compensator 100 from electric wire 108; By the holding wire 115 of described electric current, obtain a current signal, it is shared static switch 101 by described electric current and is measured by a current sensor 118; By the holding wire 120 of described electric current, obtain a current signal, it is measured by a current sensor 119 by described series connection input inverter 102; And, by holding wire 110 and holding wire 111, the DC bus voltage of the input inverter 102 that obtains connecting.Described system controller 103 by control line 114, is controlled described electric current and is shared static switch 101, by control line 112 and the described series connection input of 113 controls inverter 102.
Under normal operation, promptly, when described power supply 105 provides a voltage in predetermined boundary, the described electric current of described system controller 103 controls is shared static switch 101 and described series connection input inverter 102, and the electric current that obtains described load 106 is shared by shared static switch 101 of described electric current and described series connection input inverter 102.Hereinafter, normal operation also refers to described electric current shared model.
When detecting the voltage collapse that comes from described AC power supplies 105, described system controller 103 surpasses described predetermined threshold, this detects by the voltage on the measurement circuitry 107, the described electric current of described system controller 103 controls is shared static switch 101 and is opened, and described series connection input inverter 102, intake between terminal 107 and 108 makes the AC power supplies be in or approach described rated voltage level be provided to load 106.Like this, described dynamic series voltage compensator 100, and particularly described series connection input inverter 102, just input voltage between electric wire 107 and 108 makes described load 106 receive a power supply supply that does not have rapid drawdown, shown in waveform 122.
Fig. 2 has shown the schematic diagram than the more detailed dynamic series voltage compensator 100 of Fig. 1, and is described in conjunction with Fig. 2.Especially, illustrate in greater detail described electric current and share static switch 101 and described series connection input inverter 102.Also shown being connected of described system controller 103 and described energy storage units 104.
Described electric current is shared the thyristor 210 and 211 that static switch 101 comprises that antiparallel connects, and a thyristor driving circuit 212.Described thyristor driving circuit 212 receives a control signal by control line 114 slave controllers 103.Described control signal on control line 114 is " height ", and described thyristor driving circuit 212 provides the beginning discharge signal to thyristor 210 and 211, makes when suitable separately polarity of voltage is applied in, and each in the thyristor 210 and 211 becomes conduction.On the contrary, described control signal on control line 114 is " low ", described thyristor driving circuit 212 does not provide the beginning discharge signal to thyristor 210 and 211, when the electric current separately by thyristor 210 and 211 arrived " 0 ", described thyristor 210 and 211 formed a dead circuit.
Described series connection input inverter 102 comprises the full-bridge of a conversion equipment 200, bridge driver element 205 and 206, one conversion harmonic filters, and DC bus capacitor 209, it is connected on DC supply voltage, by circuit 116 and 117, is supplied with by described energy storage units 104.The full-bridge of conversion equipment 200 comprises 4 insulated gate bipolar transistors (IGBT) 201,202,203 and 204 that have the fly-wheel diode that is connected by antiparallel.Described conversion harmonic filter, the inductor 208 and the capacitor 207 that comprise series connection, and be connected between the outlet terminal of full-bridge of conversion equipment 200, described inductor 208 is connected positive outlet terminal "+", and described capacitor 207 is connected negative outlet terminal "-".Tie point between described inductor 208 and the described capacitor 207, be connected to electric wire 108, constitute the outlet terminal of described series connection input inverter, and the negative outlet terminal of the full-bridge of conversion equipment 200, be connected to electric wire 107, constitute the input terminal of described series connection input inverter.
Described series connection input inverter 102 on control line 112 and 113, receives control signal from described system controller 103.Described control signal on control line 112 is " height ", and IGBT203 is in conduction mode, and because the described control signal on the control line 112 is reversed by bridge driver element 206, so ICBT204 is in Disconnected mode, and vice versa.Similarly, the described control signal on control line 113 is " height ", and IGBT201 is in conduction mode, and because the described control signal on the control line 113 is reversed by bridge driver element 205, so ICBT202 is in Disconnected mode, and vice versa.
Described system controller 103 by the circuit 110 and 111 that is connected to circuit 116 and 117, is measured the described DC bus voltage that is provided to described series connection input inverter 102 by described energy storage units 104.
Fig. 3 is a more detailed schematic diagram of the described system controller 103 of described dynamic series voltage compensator 100.Though the described schematic diagram of Fig. 3 has shown a digital circuit embodiments of described system controller 103, described system controller 103 can also be realized with an analog circuit or with the form of digital circuit and combination of analogue circuitry.
As describing in conjunction with Fig. 1 and Fig. 2, described system controller 103 receives 5 inputs, and they are:
Obtain from electric wire 107, to the described input voltage signal of described dynamic voltage compensator 100;
Obtain the described output voltage signal of described dynamic voltage compensator 100 from electric wire 108;
Share static switch 101 by described electric current, measured by current sensor 118, and the described electric current that is provided by holding wire 115;
By described series connection input inverter 102, measured by current sensor 119, and be provided for the described electric current of described system controller 103 by holding wire 120; And
The described DC bus voltage of described series connection input inverter 102, it is the difference by the voltage of holding wire 110 and holding wire 111 receptions, this voltage passes through holding wire 110 and holding wire 111 by transmitting, and the voltage that receives by a differential attenuation circuit 306 obtains.
In these inputs each is an analog in form, by analog digital (A/D) transducer 301,302,305 and 304, is switched to digital form respectively.In addition, arrive the digital signal of the described input voltage signal of described dynamic series voltage compensator 100, carried out preliminary treatment by digital filter 307.
The output of described system controller 103 has the control signal of couple IGBT201 and IGBT202, by control line 113 outputs, the control signal that couple IGBT203 and IGBT204 are arranged, by control line 112 outputs, the control signal of described electric current being shared the described thyristor driving circuit 212 of static switch 101 is arranged, by control line 114 outputs.Described center line 109 is connected to the inside ground connection of described system controller 103, indicates with 327 in Fig. 3.Over-current detection parts 314, the digital form that receives the described electric current by the shared static switch 101 of described electric current is as input, and receive import inverter 102 by described series connection the digital form of described electric current as input, and whether definite overcurrent condition exists.When described over-current detection parts 314, determine to share the described electric current of static switch 101 (Fig. 2) by described electric current, perhaps import the described electric current of inverter 102 by described series connection, when whether being higher than the capacity of described IGBT of full-bridge of conversion equipment 200, described over-current detection parts 314, by holding wire 360, export " low " signal.Signal on the holding wire 360 is " height " normally." low " signal on the holding wire 360 by NAND gate 321, keeps " opening " state of the shared static switch 101 of described electric current or opens it; By with door 324a and 324b, present " low " signal to control line 112 and 113, close IGBT201 and IGBT203, open IGBT202 and IGBT204.Therefore, under this overcurrent condition, when described series connection input inverter 102 was not imported any energy between electric wire 107 and electric wire 108, described electric current was shared static switch 101 and is made a forcible entry into conduction mode.Described dynamic series voltage compensator 100, under described overcurrent condition, the uncompensation voltage collapse.
In operation, arrive the filtered digital signal of the described input voltage of described dynamic series voltage compensator 100, be sent to a reference table updating component 308.Described reference table updating component 308 is by the signal controlling on the holding wire 345.When the signal on the holding wire 345 was " low ", this was in normal operation or electric current shared model, and described reference table updating component 308 is upgraded a reference signal form continuously, and it is storing the numeral of the input voltage on the electric wire 107.When the signal on the holding wire 345 was " height ", this was in the situation that detects a voltage collapse, and described reference table updating component 308 is freezed described available reference signal table.Described reference table updating component 308 generates a reference signal, and this signal is fed into dip detection block 309 by holding wire 362, be used for detecting the voltage collapse situation, also, be fed to subtracter 310 and 311, with generating an input voltage signal by holding wire 341.
Reference signal on the subtracter 310 signal calculated lines 341 and by the difference between the filtered digital signal of the input voltage on the electric wire 107 of holding wire 340.Difference between the reference signal on the subtracter 311 signal calculated lines 341 and the digital signal of the output voltage on the holding wire 342 is just adjusted by pulse input (PI) control 312 then.Calculate by adder 313, the output of subtracter 310 and PI control 312 and, just be used as input and be provided to pulse width modulation (PWM) generator 318.And described PWM generator 318 is used from A/D converter 304, and the described DC bus voltage of described series connection input inverter 102 with on holding wire 343 and holding wire 344, generates the PWM switching signal.
Described dip detection block 309, receive following signal as input: by holding wire 340, receive the filtered digital signal of the described input voltage on the electric wire 107, reception comes from the described reference signal of described reference table updating component 308, by holding wire 342, receive the described digital signal of the described output voltage on the electric wire 108,, receive the digital form that the described electric current of flowing through is shared the electric current of static switch 101 via holding wire 346; And determine whether to have taken place voltage collapse from these inputs, should the employ artificail commutation, and whether described artificail commutation is finished.Described dip detection block 309 generates an angle of flow control signal as output, on holding wire 353, by NAND gate 326 and NAND gate 321, offer described electric current and share static switch 101, the signal that also generates one two is as output, by holding wire 351 and 352, offer parts 315.In a preferred embodiment, described dip detection block 309 has only when the instantaneous value of the described reference signal that comes from described reference table updating component 308 exceeds 30% than the peak value of storing, and just determines whether to have taken place voltage collapse.
After a predetermined delay disappeared in each zero crossing of described electric current, the described angle of flow control signal on the circuit 353 was set as " height ".Before the next zero crossing of described electric current, described angle of flow control signal is set as " low " again.When the described angle of flow of the shared static switch of described electric current was set to 180 electrical phase angles, the described delay after each zero crossing of described electric current was set as zero.In this case, the described angle of flow control signal on the holding wire 353 always is made as " height ".
Parts 315 will become four signals from described two signal decodings that described dip detection block 309 receives, and be provided to holding wire 350,349, on 348 and 347.When described two signals are " 00 ", the signal on holding wire 350 is set as " height "; Other three signals are set as " low ".When described two signals are " 01 ", the signal on holding wire 349 is set as " height "; Other three signals are set as " low ".When described two signals are " 10 ", the signal on holding wire 348 is set as " height "; Other three signals are set as " low ".At last, when described two signals are " 11 ", the signal on holding wire 347 is set as " height "; Other three signals are set as " low ".
Difference between the filtered digital signal of described reference signal that is provided by holding wire 362 and the described input voltage that provided by holding wire 340 is greater than a setting in advance, and when the digital form of sharing the described electric current of static switch 101 by described electric current was negative, dip detection block 309 generated described two signals " 00 ".Described two signals " 00 " show positive artificail commutation of needs (positive FC).
Difference between the filtered digital signal of described reference signal that is provided by holding wire 362 and the described input voltage that provided by holding wire 340 is greater than a setting in advance, and the digital form of sharing the described electric current of static switch 101 by described electric current is timing, and dip detection block 309 generates described two signals " 01 ".Described two signals " 01 " show negative artificail commutation of needs (negative FC).
Difference between the filtered digital signal of described reference signal that is provided by holding wire 362 and the described input voltage that provided by holding wire 340 is greater than described setting in advance, and detect when sharing the zero crossing of digital form of described electric current of static switch 101 by described electric current, described dip detection block 309 generates described two signals " 11 ".Described two signals " 11 " show that artificail commutation finishes, and the series voltage input can begin.This state is usually followed two states of two signals of above-mentioned generation " 00 " or " 01 ".
In operate as normal, promptly, difference between the filtered digital signal of described reference signal that is provided by holding wire 362 and the described input voltage that provided by holding wire 340 is less than described setting in advance, dip detection block 309 generates described two signals " 10 ", showing does not need dip compensation, and is called as the triggering attitude.Signal on holding wire 348 is set as " height "; Other three signals are made as " low " by parts 315, and feasible or door 316 is output as " low ".Under this situation, the described signal on the holding wire 345 is " low " still, and described reference table updating component 308 is upgraded a reference signal form continuously.Or door 316 output, be fed into described and door 326 by the described angle of flow control signal on circuit 353 before, anti-phase by inverse gate 325.Under this normal operation, the output of the described inverse gate 325 that is provided by holding wire 361 is " height ".Be not under the situation of overcurrent, the state of the described signal on the circuit 114 will be the state of the described angle of flow signal on the holding wire 353.Like this, under the situation that is not overcurrent, when the phase angle of electric current (signal on the holding wire 353 is " height ") within the described angle of flow, be forced on the control line 114 " height ", and described thyristor driving circuit 212 provides discharge signal to thyristor 210 and 211.
When holding wire 350, when any one signal is high on 349 or 347, this occurs in dip detection block 309 and detects a voltage collapse, and generate described two signals " 00 " respectively, " 01 " or " 11 ", or door 316 described output is " height ", and the signal on the holding wire 361 is " low ".Under the situation that is not overcurrent, when detecting a voltage collapse, control line 114 is forced " low ", and irrelevant with the described state of described angle of flow control signal on the holding wire 353, and described thyristor driving circuit 212 does not provide discharge signal to thyristor 210 and 211.And the described signal on the holding wire 345 is " height ", and described reference table updating component 308 is freezed described available reference signal table.
Therefore, as from the foregoing, when detecting a voltage collapse and handing over zero by the electric current of the shared static switch 101 of described electric current, described electric current is shared static switch 101 and is closed.When detecting an overcurrent condition; Or when the described phase place that does not need dip compensation and electric current was within described conduction phase angle, the shared static switch 101 of described electric current was unlocked or is held open state.In the electric current shared model, when having only described phase place when electric current within described conduction phase angle, described electric current is shared static switch 101 and is unlocked.
As mentioned above, when the positive artificail commutation of needs and described two signals were " 00 ", the described signal on the holding wire 350 was set as " height ".Or the door 322 after, the signal on the holding wire 358 also is " height ".Under the situation that is not overcurrent, with the described output of door 324a be " height ", this makes that control line 112 is " height ", and IGBT203 is unlocked, and IGBT204 is closed.When the signal on the holding wire 347 and 348 is " low ", respectively by holding wire 354,356 and 367 that provide and doors 319, described being output as " low " on 320a and the 320b, and when the signal on the holding wire 349 also is " low ", also be " low " by holding wire 359 described outputs that provide or door 323.With the described output of door 324b be " low ", this makes control line 113 be " low ", and IGBT202 is unlocked, and IGBT201 is closed.
Similarly, when the negative artificail commutation of needs and described two signals were " 01 ", the described signal on the holding wire 349 was set as " height ", cause or door 323 after holding wire 359 on described signal be " height ".Under the situation that is not overcurrent, with the described output of door 324b be " height ", this causes control line 113 to be " height ", and IGBT201 is unlocked, and IGBT202 is closed.When the signal on the holding wire 347 and 348 was " low ", with described being output as " low " on door 320a and 319, and the signal on the holding wire 350 was when being " low ", or after the door 322, the described signal on the circuit 358 also is " low ".Described signal on the circuit 112 is forced to " low " with door 324a, and IGBT204 is unlocked, and IGBT203 is closed.
After described negative or positive artificail commutation, (correspond respectively to two signals " 00 " and " 01 "), when detecting when sharing the zero crossing of described digital form of described electric current of static switch 101, be " 11 " for described two signals of dip compensation by described electric current.Described signal on the holding wire 347 is set as " height ", and 3 output signals of other on the parts 315 are set as low.On the holding wire 343 and 344, the described PWM switching signal that is generated by PWM generator 318 is transformed into control line 112 and 113 respectively.The described IGBT201 of the described full-bridge of conversion equipment 200 (Fig. 2), 202,203 and 204 by described PWM switching signal control, generate a PWM output, this output is after being provided described filtering by inductor 208 and capacitor 207, form the sinusoidal signal of needs, this signal makes the described output voltage of the described dynamic voltage compensator on the circuit 108 not influenced by rapid drawdown.
At last, when not needing dip compensation, described triggering state, described two signals are " 10 ", and the described signal on the holding wire 348 is set as " height ".Described signal on the holding wire 348 is " height ", provides as the time by parts 317 with triggering signal of the input of door 319, and be the state of described triggering signal by the holding wire 354 described outputs with door 319 that provide.Or the described output of door 322 and 323 also triggers with described triggering signal.Under the situation that is not overcurrent, also to trigger with the described output of door 324a and 324b, it triggers control line 112 and 113 conversely.When the described triggering signal of parts 317 was " height ", IGBT201 and 203 was unlocked, and IGBT202 and 204 is closed.When the described triggering signal of parts 317 is transformed into " low ", IGBT201 and 203 is closed, and IGBT202 and 204 is unlocked.At described triggering state, the described outlet terminal "+" of the described full electric bridge of conversion equipment 200 and "-" are transformed into positive dc bus 220 from negative dc bus 221 simultaneously, perhaps are transformed into negative dc bus 221 from positive dc bus 220 simultaneously.These triggering states can not cause any disorder between input terminal 107 and the outlet terminal 108.At the triggering state, after each zero crossing of described electric current, and the described angle of flow control signal on circuit 353 is set as " height " before, and it is nonconducting that described electric current is shared static switch 101, and the described load current described inverter 102 of flowing through, it is in short-circuit mode.When after described predetermined delay, the described angle of flow control signal on the circuit 353 is set as " height ", and described electric current is shared static switch 101 and conduct electricity, and the described load current shared static switch 101 of described electric current of flowing through.
Usually, electric power compensation equipment some months was all worked not detecting under the situation of voltage collapse even in several years.Described dynamic series voltage compensator 100 has checked described electric current to share the translation function of conversion equipment 201,202,203 and 204 during not having voltage collapse of static switch 101 and series connection input inverter 102.Especially, the described translation function that described electric current is shared static switch 101 is verified by described angle of flow control, and the described translation function of described conversion equipment 201,202,203 and 204 is verified by described triggering conversion.The frequency of described triggering conversion is by the described FREQUENCY CONTROL of the described signal of parts 317, its according to every how long needs check the described translation function of described conversion equipment 201,202,203 and 204 and be determined.In a preferred embodiment, described triggering frequency is 0.1Hz.
Fig. 4 is a schematic block diagram, has shown to have the three-phase embodiment that an electric current is shared a dynamic voltage compensator of static switch.In fact, the three-phase embodiment of the described dynamic voltage compensator with the shared static switch of electric current among Fig. 2 is combined the described three phase dynamic voltage compensator of formation.In Fig. 4, do not demonstrate b phase and c control line mutually, holding wire, described energy storage units and series connection input inverter.Though in the described three-phase embodiment of described dynamic series voltage compensator, can use three independently system controllers, typically, a single controller is used to control described three series connection input inverters, and described three electric currents are shared the principle that the static switch use is described in conjunction with Fig. 3.
Fig. 5 A has shown the oscillogram 501 of the typical voltage collapse that comes from described AC power supplies 105 (Fig. 1) on the circuit 107.Fig. 5 B shown, during the voltage collapse that Fig. 5 A shows, and the oscillogram 502 of the described output voltage of the described single-phase dynamic series voltage compensator 100 on the line 108.Fig. 6 A has shown the oscillogram 601 of a typical voltage collapse that comes from a three-phase AC power supplies 105, and Fig. 6 B has shown, during the voltage collapse that Fig. 6 A shows, the oscillogram 602 of the described output voltage of described three phase dynamic series voltage compensator (Fig. 4).Compensated at described input voltage 501 and the 602 described voltage collapses that occur, make described output voltage 502 and 602 not influenced by rapid drawdown.
Described embodiment of the present invention has many good qualities.Advantage be in described electric current shared model maybe when when described AC power supplies 105 does not have the electric current rapid drawdown, described load current is shared static switch 101 by described electric current and described series connection input inverter 102 is shared.Described electric current is shared static switch 101 because the major part of described load current is flowed through, switch 101 is in the voltage decline very little (less than 1V) of conduction mode, therefore between the described input and described output of described dynamic series voltage compensator 100, there is not tangible voltage to descend.
Another advantage of described embodiment of the present invention is, in described electric current shared model maybe when when described AC power supplies 105 does not have voltage collapse, have only a fraction of load current described inverter 102 of flowing through, make described inverter 102 and described filter (capacitor 207 shown in Figure 2 and inductor 208) can keep less size.
The further advantage of described embodiment of the present invention is, in described electric current shared model maybe when when described AC power supplies 105 does not have voltage collapse, described inverter 102 and described electric current are shared the described conversion equipment 201 of static switch 101,202,203,204,210 and 211 described translation function is by triggering the conversion and angle of flow control check continuously.
Below only described some embodiments of the present invention, under the situation that does not deviate from scope and spirit of the present invention, can make an amendment and/or change, described embodiment is descriptive, does not have restricted.
Claims (17)
1. a dynamic series voltage compensator is used in the rapid drawdown of alternating current electric power system bucking voltage, and described dynamic series voltage compensator comprises:
An energy storage units is used for form stored energy with direct voltage;
An electric current is shared static switch, is connected between the input and output terminal of described dynamic voltage compensator, is used for selecting the described input and output terminal of connection;
A series connection input inverter is shared static switch with described electric current and is connected in parallel, be used for changing come from described energy storage units described direct voltage to alternating voltage; And
A system controller, the voltage collapse and the described electric current of control that are used for detecting on described input terminal are shared static switch and described series connection input inverter, wherein, when not detecting voltage collapse, it is conduction state that described system controller is controlled the shared static switch of described electric current, continue at least a portion of a current cycle, and control described series connection input inverter and conduct a part of described electric current to described outlet terminal, and in case described system controller detects a voltage collapse, it is non-conductive state that described system controller is controlled the shared static switch of described electric current, and control described series connection input inverter and between described input and output terminal, import a voltage signal, to compensate described voltage collapse.
2. dynamic series voltage compensator according to claim 1, wherein, when not detecting voltage collapse, it is non-conductive state that described system controller is controlled the shared static switch of described electric current, continue a preset time, share the electric current of static switch at the described electric current of flowing through and hand over after zero, and after control it for conduction, share the described electric current of static switch up to the described electric current of flowing through and hand over zero once more.
3. dynamic series voltage compensator according to claim 1, wherein said electric current are shared static switch and are comprised:
The thyristor that antiparallel connects; And
A thyristor driving circuit, be used for receiving a control signal from described system controller, be used for providing discharge signal to respond described control signal to the thyristor that described antiparallel connects, wherein, when not detecting voltage collapse, described system controller is controlled described thyristor driving circuit after one period scheduled time after the electric current friendship zero of the shared static switch of described electric current of flowing through, and described discharge signal is provided.
4. dynamic series voltage compensator according to claim 3 wherein, is imported the described part that inverter is provided to the described electric current of described outlet terminal by described series connection, controls by controlling described preset time.
5. dynamic series voltage compensator according to claim 1, wherein, described series connection input inverter comprises a full electric bridge of conversion equipment.
6. dynamic series voltage compensator according to claim 5, wherein, when described electric current was shared static switch and is controlled as conduction, described conversion equipment was converted and makes do not import any voltage signal between described input and output terminal.
7. dynamic series voltage compensator according to claim 5, wherein, described full electric bridge comprises 4 insulated gate bipolar transistors with fly-wheel diode of antiparallel connection.
8. dynamic series voltage compensator according to claim 5, wherein, described series connection input inverter further comprises a low pass filter, described low pass filter comprises a capacitor and an inductor.
9. dynamic series voltage compensator according to claim 1, wherein, described system controller comprises a reference signal table, the value of the voltage on the described input terminal when this table is used for storing representative and does not detect voltage collapse, described system controller use the described value in the described reference signal table to detect described voltage collapse and the control described voltage signal by the input of described series connection input inverter.
10. dynamic series voltage compensator according to claim 9, wherein, when the difference between the respective value of storing in voltage on the described input terminal and the described reference signal table surpassed a predetermined value, described system controller detected voltage collapse.
11. dynamic series voltage compensator according to claim 10 wherein, has only when the described respective value in the described reference signal table surpasses the peak value 30% that is stored in the described reference signal table, described system controller is just carried out voltage collapse and is detected.
12. dynamic series voltage compensator according to claim 9, wherein, when detecting voltage collapse, described reference signal table is frozen.
13. dynamic series voltage compensator according to claim 9, wherein, at least one difference between the respective value of storing in voltage on the described input terminal and the described reference signal table is used to generate a pulse width modulation control signal to described series connection input inverter.
14. dynamic series voltage compensator according to claim 13, wherein, a difference between voltage on the described input terminal and the described respective value is further used in and generates described pulse width modulation control signal.
15. dynamic series voltage compensator according to claim 1, wherein, the further monitoring flow of described system controller detects an over-current state through the electric current of described series connection input inverter and the electric current of the shared static switch of described electric current of flowing through.
16. dynamic series voltage compensator according to claim 15, wherein, described system controller one detect that the described electric current of flowing through is shared the described electric current of static switch or the described electric current of the described series connection input inverter of flowing through at least one when being higher than the capacity of conversion equipment of described series connection input inverter, described system controller is controlled described electric current and is shared static switch for what conduct electricity, continues a complete current cycle.
17. dynamic series voltage compensator according to claim 1, wherein, described energy storage units comprises one or more ultra-high capacities, an energy-storage system and a battery unit.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/SG2002/000077 WO2003098771A1 (en) | 2002-05-02 | 2002-05-02 | Dynamic series voltage compensator with current sharing static switch |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1625824A true CN1625824A (en) | 2005-06-08 |
| CN100423396C CN100423396C (en) | 2008-10-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB028288785A Expired - Fee Related CN100423396C (en) | 2002-05-02 | 2002-05-02 | Dyamic series voltage compensator with current sharing static switch |
Country Status (8)
| Country | Link |
|---|---|
| JP (1) | JP3954068B2 (en) |
| KR (1) | KR20050009994A (en) |
| CN (1) | CN100423396C (en) |
| HK (1) | HK1073185A1 (en) |
| MY (1) | MY135118A (en) |
| NZ (1) | NZ536200A (en) |
| TW (1) | TW571479B (en) |
| WO (1) | WO2003098771A1 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104659899A (en) * | 2014-12-29 | 2015-05-27 | 西安华为技术有限公司 | Method, device and system for flow equalization |
| CN106849103A (en) * | 2017-03-03 | 2017-06-13 | 上海交通大学 | Transformerless type single-phase dynamic voltage compensator based on HVDC Modulation |
| CN112886606A (en) * | 2021-01-28 | 2021-06-01 | 南方电网科学研究院有限责任公司 | Hybrid reactive compensation method, device, equipment and medium considering valve side regulation |
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| CN100375363C (en) * | 2006-04-07 | 2008-03-12 | 北京四方清能电气电子有限公司 | Apparatus for providing current loop for serial compensation equipment |
| KR101192444B1 (en) | 2010-07-05 | 2012-10-18 | 정윤이 | Battery power supply apparatus and method for power control thereof |
| GB201206318D0 (en) * | 2012-04-10 | 2012-05-23 | Imp Innovations Ltd | A power compensator |
| TWI453432B (en) * | 2012-11-28 | 2014-09-21 | Simplo Technology Co Ltd | Insulating detection circuit and method thereof |
| ES2909971T3 (en) * | 2016-09-02 | 2022-05-11 | Siemens Energy Global Gmbh & Co Kg | Device for the dynamic stabilization of the transmission of electrical energy through a power line |
| CN107706924A (en) * | 2017-10-23 | 2018-02-16 | 衢州学院 | A kind of dynamic voltage compensator in series type |
| FR3083020B1 (en) * | 2018-06-26 | 2020-07-03 | Ge Energy Power Conversion Technology Limited | VOLTAGE COMPENSATION SYSTEM FOR MULTI-PHASE ELECTRIC POWER DISTRIBUTION CIRCUIT |
| TWI692181B (en) | 2018-10-16 | 2020-04-21 | 財團法人工業技術研究院 | Electric power regulating system and method thereof |
| CN109361213B (en) * | 2018-11-23 | 2022-03-29 | 南京南瑞继保电气有限公司 | Withdrawal device and method for series converter of hybrid direct-current power transmission system |
| CN110460080B (en) * | 2019-09-10 | 2021-07-06 | 国网四川省电力公司电力科学研究院 | Voltage compensation type battery energy storage converter and control method thereof |
| CN111799796B (en) * | 2020-07-02 | 2023-11-17 | 云南电网有限责任公司电力科学研究院 | Output harmonic suppression method for H-bridge cascade type static synchronous compensator |
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| CN116073505A (en) | 2021-11-03 | 2023-05-05 | 台达电子工业股份有限公司 | Uninterruptible power device with path forced turn-off function and path forced turn-off method |
| CN114447936B (en) * | 2021-12-24 | 2022-12-09 | 致瞻科技(上海)有限公司 | Dynamic voltage compensation method for silicon carbide device |
| TWI824812B (en) * | 2022-11-07 | 2023-12-01 | 泰茂實業股份有限公司 | Hybrid power supply system as well as method, computer program, and computer readable medium for prolongating the power supply time of secondary battery |
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| US5329222A (en) * | 1992-11-30 | 1994-07-12 | Westinghouse Electric Corporation | Apparatus and method for dynamic voltage restoration of utility distribution networks |
| US5610501A (en) * | 1995-02-01 | 1997-03-11 | Westinghouse Electric Corporation | Dynamic power and voltage regulator for an ac transmission line |
| CN1149776A (en) * | 1996-09-03 | 1997-05-14 | 江西涤纶厂 | Compensating method for instantaneous voltage drop and its device |
| US5883796A (en) * | 1997-04-07 | 1999-03-16 | Wisconsin Alumni Research Foundation | Dynamic series voltage restoration for sensitive loads in unbalanced power systems |
| US6118676A (en) * | 1998-11-06 | 2000-09-12 | Soft Switching Technologies Corp. | Dynamic voltage sag correction |
| JP3664435B2 (en) * | 2000-04-25 | 2005-06-29 | メイデン パワー ソルーションズ シンガポール ピーティーイー リミテッド | Dynamic series voltage compensation apparatus and method |
-
2002
- 2002-05-02 NZ NZ536200A patent/NZ536200A/en unknown
- 2002-05-02 KR KR10-2004-7017586A patent/KR20050009994A/en not_active Application Discontinuation
- 2002-05-02 WO PCT/SG2002/000077 patent/WO2003098771A1/en active Application Filing
- 2002-05-02 JP JP2004506153A patent/JP3954068B2/en not_active Expired - Fee Related
- 2002-05-02 CN CNB028288785A patent/CN100423396C/en not_active Expired - Fee Related
- 2002-06-06 MY MYPI20022093A patent/MY135118A/en unknown
- 2002-06-12 TW TW091112743A patent/TW571479B/en not_active IP Right Cessation
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2005
- 2005-08-04 HK HK05106696A patent/HK1073185A1/en not_active IP Right Cessation
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104659899A (en) * | 2014-12-29 | 2015-05-27 | 西安华为技术有限公司 | Method, device and system for flow equalization |
| CN104659899B (en) * | 2014-12-29 | 2018-08-21 | 西安华为技术有限公司 | A kind of current equalizing method, apparatus and system |
| CN106849103A (en) * | 2017-03-03 | 2017-06-13 | 上海交通大学 | Transformerless type single-phase dynamic voltage compensator based on HVDC Modulation |
| CN112886606A (en) * | 2021-01-28 | 2021-06-01 | 南方电网科学研究院有限责任公司 | Hybrid reactive compensation method, device, equipment and medium considering valve side regulation |
| CN112886606B (en) * | 2021-01-28 | 2022-10-28 | 南方电网科学研究院有限责任公司 | Hybrid reactive compensation method, device, equipment and medium considering valve side regulation and control |
Also Published As
| Publication number | Publication date |
|---|---|
| HK1073185A1 (en) | 2005-09-23 |
| AU2002258339A1 (en) | 2003-12-02 |
| NZ536200A (en) | 2006-09-29 |
| WO2003098771A1 (en) | 2003-11-27 |
| TW571479B (en) | 2004-01-11 |
| JP3954068B2 (en) | 2007-08-08 |
| KR20050009994A (en) | 2005-01-26 |
| JP2005525078A (en) | 2005-08-18 |
| MY135118A (en) | 2008-02-29 |
| CN100423396C (en) | 2008-10-01 |
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