CN101141069A - quick-speed synchronization parallelly-arranged system between electric networks and method of use thereof - Google Patents
quick-speed synchronization parallelly-arranged system between electric networks and method of use thereof Download PDFInfo
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- CN101141069A CN101141069A CNA200710149367XA CN200710149367A CN101141069A CN 101141069 A CN101141069 A CN 101141069A CN A200710149367X A CNA200710149367X A CN A200710149367XA CN 200710149367 A CN200710149367 A CN 200710149367A CN 101141069 A CN101141069 A CN 101141069A
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Abstract
The invention provides a quick corresponding parallel system between electric networks and a relative application method, which relates to a rectifying-investing system formed by high voltage electric power electric appliances, and can quickly connect two electric networks with different frequencies, quickly realize load support from the circle electric network to the low circle electric network, and eliminate the system vibration to prevent accident expansion. Following the load transmission, after satisfying the conditions of corresponding parallel, the two networks automatically complete the corresponding parallel, and exit the quick parallel system; besides, the same method also can quickly achieve ring network parallel operation for the line. Being safe and reliable, the invention has advantages of quick parallel speed and high automatization level, thereby radically solving the situation of manual operation in the prior electric network parallel; moreover, the parallel system is further applicable to the test of rising current and rising voltage for the line.
Description
Affiliated technical field
The present invention relates to synchronization paralleling and looped network system arranged side by side between a kind of electrical network, rectification---the inversion system that particularly a kind of high voltage electric and electronic device (controllable silicon, gate level turn-off thyristor GTO, insulated gate bipolar transistor IGBT, integrated gate commutated thyristor IGCT) constitutes.
Background technology
At present, large-scale load-center substation plays very important anastomosis between inter-provincial electrical network, regional power grid and international electrical network.The rapidity of the parallel operation in the load-center substation and fail safe, can can be related under the accident conditions system quick recovery system, provide meritorious to low all electrical networks in time and support, to eliminate system oscillation, the accident that prevents enlarges, and guarantees to user's continued power or restores electricity fast.Yet there are following problem side by side in synchronization paralleling between the electrical network and looped network.
First, the synchronization paralleling operation of load-center substation, owing to be subjected to the restriction of very strict same period of condition, present synchronization paralleling relies on manual operations, speed is slow, automaticity is low, operation easier is big, operation involves a wide range of knowledge, at the bottom of the success rate, the existing synchronization paralleling automation of operation degree in the transformer station of making lags far behind the overall technology level of electrical network.
As everyone knows, the operation of synchronization paralleling in the electric power system is divided into two kinds of situations, and a kind of is unit in the power plant and the synchronization paralleling between the electrical network, and the 2nd, the synchronization paralleling of (between bus and the circuit) between two electrical networks in the load-center substation.The former, owing in the power plant, adopted automatic sub-synchronous device, can be in the unit start, according to difference on the frequency between electrical network and the unit and voltage difference, by automatic sub-synchronous device send conditioning signal regulate automatically the rotating speed of unit and voltage, automatically satisfy the condition same period, send closing pulse automatically unit closed a floodgate side by side.Whole process speed arranged side by side is very fast, and the general time that only needs tens of seconds, whole process arranged side by side has also realized increasingly automated.
But in large-scale load-center substation, when carrying out synchronization paralleling between two electrical networks, the difficulty of operation is but very big.Parallel operation must satisfy two difference on the frequencies, voltage difference, phase angle difference between the electrical network simultaneously less than the scope of a certain permission, just can be arranged side by side.That is:
U1=U2 or: U1-U2＜Δ U
F1=F2 or: F1-F2＜Δ F
δ 1=δ 2 or: δ 1-δ 2＜Δ δ
(the U representative voltage, F represents frequency, δ represents the phase angle)
In order to satisfy above condition side by side, adjusting each parameter, to satisfy the process of synchronization paralleling condition quite loaded down with trivial details.At first, subdispatch the dispatcher will be according to difference on the frequency and the voltage difference between two systems at bus and circuit place, order to adjust in two systems meritorious and idle, difference on the frequency and voltage difference are moved closer to, phase angle difference is dwindled gradually, transient process when utilizing slippage (phase angle difference) zero crossing adopts the manual accurate same period or automatic presynchronization mode to carry out side by side by the load-center substation operator on duty.Whole parallel operation relates to a plurality of link fellowships such as scheduling, frequency modulation power plant, load-center substation.The dispatcher to command simultaneously frequency modulation power plant and side by side the cooperation between the transformer station finish parallel operation, operating process is in manual operation state, this process arranged side by side needs tens of minutes mostly, under the accident conditions even need several hrs.
In " U.S.A add have a power failure on a large scale " accident, power system restoration was for up to 26 hours, and some areas, markon Fu Niya state reach 4 days, and Canadian some areas reach week age.One of major reason that resume speed is slow is exactly that the speed of synchronization paralleling between the electrical network is too slow.In " Moscow has a power failure on a large scale ", " Europe has a power failure on a large scale " and China's part electrical network synchronization paralleling process, slow-footed problem arranged side by side is all very outstanding.
Sometimes; for the connection of recovery system as early as possible; eliminate malfunction; it is bigger at difference on the frequency, voltage difference to have to, and the speed when the slippage zero crossing under the situation, is carried out manual quasi-synchronization paralleling faster by force; constantly will produce bigger system shock side by side; can cause that protective relaying device moves in tripping operation when serious, make failure arranged side by side, accident enlarges.
The second, in long transmission line looped network parallel operation process, although little at point arranged side by side both sides pressure reduction, difference on the frequency is zero, because bigger phase angle difference can appear in the influence of trend.The distribution reduction phase angle difference of putting arranged side by side that often needs to adjust the load trend satisfies ring and condition.The process of adjusting the load trend is also very loaded down with trivial details, relates to the factors such as stability limit, equipment component overload of components of system as directed circuit.System call will be done a large amount of adjustment work, generally needs the load side operating part to ration the power supply, be to certain customers' interruption of power supply, and mains side reduces exerts oneself, and there are many risk factors in the trend adjustment process.
Put it briefly, there is following problem side by side in electrical network at present:
1, synchronization paralleling speed is slow.Especially under accident conditions, can not promptly provide meritorious fast and support to low all electrical networks, to rapid elimination system oscillation, the accident that prevents enlarge, recover rapidly electrical network normal operation, guarantee that the safe operation of system is totally unfavorable.Also to excise the sub-load of low all electrical networks when serious, cause and ration the power supply.
2, synchronization paralleling handling safety poor reliability.The parallel operation involvement aspect is big, upward arrives subdispatch or economizes dispatch control, participates in frequency modulation to big power station down, and the part electric substation of receiving end electrical network carries out the operation of rationing the power supply, and parallel operation is carried out in the load-center substation.Operation link is many, is easy to generate misoperation.Parallel operation in emergency circumstances is bigger in voltage difference, difference on the frequency, and slippage carries out under the situation faster, is easy to generate greater impact, may cause that also the would trip of protective device makes failure arranged side by side when serious, and accident enlarges.
3, automatization level is low.At present, a large amount of employings of various protective devices and automation equipment in the electrical network make the automatization level, equipment, managerial skills of whole electrical network all to a very high stage.But the synchronization paralleling operation is manual carrying out, and does not realize automation, and its automatization level lags behind the general technical present situation, has become the short slab in the whole electric power network technique management, and the constantly situation requirement of the big electrical network of expansion is far from suitable.
When 4, looped network operation phase angle difference was too big, there was more risk in the work that the Adjustment System trend distributes, and equipment component may make system stability destroy near stability limit sometimes, and load side is rationed the power supply and can be made certain customers' power failure.
Summary of the invention
In order to solve above synchronization paralleling and looped network existing problem arranged side by side, the system (hereinafter to be referred as system arranged side by side) side by side fast that the present invention adopts that high pressure half control power electronic device (controllable silicon) or high pressure control entirely that rectification that power electronic device (gate level turn-off thyristor GTO, insulated gate bipolar transistor IGBT, integrated gate commutated thyristor IGCT, below abbreviate GTO, IGBT, IGCT respectively as) forms and inversion system constituted.
When carrying out synchronization paralleling, connect the bus of transformer station and treat also circuit with system arranged side by side earlier, with bus with treat and circuit under two different electrical networks of frequency connect fast, for being reverse into low all mains frequencies again, direct current equates the interchange of all sides of height is whole, low all electrical networks are sent in the identical interchange in phase angle, realize fast from of the load transmission of all electrical networks of height to low all electrical networks, transmission along with load, frequency between two electrical networks is approaching rapidly, treat that slippage is zero, when satisfying the synchronization paralleling condition, it is arranged side by side that the gate out switch of circuit of closing is fast finished automatic presynchronization, afterwards, withdraw from system arranged side by side.
Carrying out looped network when arranged side by side, connect the bus of transformer station and treat also circuit with system arranged side by side earlier, with bus with treat and circuit connects fast, the interchange of the leading side of phase place is whole for direct current is reverse into and the lag identical interchange in phase angle of side of phase angle again, load to phase lag side hop, transmission along with load, the both sides phase angle difference is dwindled gradually, and when satisfying looped network condition arranged side by side, it is arranged side by side that the gate out switch of the circuit that closes is fast finished looped network automatically, afterwards, withdraw from system arranged side by side.
Content of the present invention comprises fast system and application process thereof side by side.System is divided into the two big classes system arranged side by side of half control power electronic device and full control power electronic device composition side by side.
First kind system arranged side by side adopts high-pressure thyristor (controllable silicon) to form, that is:
A kind of system fast arranged side by side, it is characterized in that: have the DC side of two groups of high-voltage thyristor converters and at least one group of smoothing reactor three head and the tail annular closed-loop path that is electrically connected to form successively at least, wherein the AC side of one group of converter is electrically connected with the bus of transformer station by a converter transformer and a high-voltage switch gear, the AC side of another group converter is connected with a line electricity with another high-voltage switch gear by another converter transformer, and a cover controlled adjuster is used to regulate controllable silicon and control switch.
The technical spirit of first kind synchronization paralleling system is a reversible rectification a---inversion system, effect is that two frequency differences or the different electrical network (bus and circuit) of phase place are connected fast, the transmission of loading fast, when satisfying synchronization paralleling or looped network condition arranged side by side, automatically realize fast that synchronization paralleling and looped network between the electrical network are arranged side by side, describe in detail subsequently.
Second class system arranged side by side adopts power electronic device such as full control such as GTO or IGBT or IGCT etc. to form, that is:
A kind of system fast arranged side by side, it is characterized in that: the DC side that has two groups of converters being made up of full control power electronic device GTO or IGBT or IGCT at least is through electric capacity of voltage regulation reversible rectification---the inversion circuit that is electrically connected to form, the AC side of first group of converter is through one group of reactor, converter transformer, switch links to each other with the bus of transformer station, the AC side of second group of converter is organized reactor through another, another group converter transformer and another group switch links to each other with column line also, between two groups of converter transformers and the reactor, each adds one group of filter, and by a cover controlled adjuster control whole system operation.
The technical spirit of second class system arranged side by side is identical with the effect and first kind system arranged side by side, difference is that first kind system arranged side by side adopts half control power electronic device (controllable silicon) to constitute converter, the silicon controlled conducting can only be artificially controlled in silicon controlled work, uncontrollable its closed, in the operate as normal, rely on the alternating current zero crossing to turn-off naturally, so can't be operated in the less active inversion state of passive inverter state or power supply capacity in the first kind system arranged side by side, promptly can't carry out inversion to ceases to be busy road not with voltage, commutation failure also appears in power supply capacity active inversion hour easily.And the second class synchronization paralleling system, adopt full control power electronic device, its inversion converter can be operated in passive inverter state or the less active inversion state of power supply capacity, can apply an artificial given power-frequency voltage to the road inversion of no line ball, so outside second class system arranged side by side can realize that quick synchronization paralleling between the electrical network and fast looped network are side by side, can also boost to circuit, the up-flow test.Now system arranged side by side is carried out synchronization paralleling, looped network side by side, the method for pressure build-up test, up-flow test is described below:
Quick synchronization paralleling method between a kind of electrical network, it is characterized in that: with above-mentioned first kind system arranged side by side or second class system arranged side by side, insert the bus of transformer station and treat and circuit between, bus and treat and what person of two electrical networks of circuit representative is high all electrical networks no matter, controlled adjuster can send regulating impulse from the trend converter, make the converter of high all sides be in the rectification operating state, make the converter of low all sides be in the inversion operating state, realization is from the load transmission of all electrical networks of height to low all electrical networks, when making two electrical networks satisfy the synchronization paralleling condition rapidly, controlled adjuster sends closing pulse from the switch of this circuit of trend to be closed a floodgate line switching to finish automatic presynchronization arranged side by side, simultaneously send the tripping operation pulse to the both sides of system arranged side by side switch again, and the trigger impulse of shutoff converter, system arranged side by side is deactivated.
When between the bus of transformer station and circuit, carrying out the looped network operation, although, have very big phase angle difference sometimes in that some both sides voltage difference is less side by side, frequency is identical.Above-mentioned first kind system arranged side by side or second class system arranged side by side can be inserted the bus of transformer station earlier equally and treat and circuit between, the side hop load that a leading side direction phase angle, phase angle lags, realize that again looped network is arranged side by side after phase angle difference dwindled, just do not need the distribution of the artificial Adjustment System load of system call person trend, safety, reliable, quick.That is:
Fast looped network paralleling method between a kind of electrical network, it is characterized in that: it is arranged side by side with above-mentioned first kind system arranged side by side or second class system arranged side by side the bus of transformer station and circuit to be carried out looped network, the switch of the system arranged side by side of closing earlier both sides is connected in bus with system arranged side by side and treats also between the circuit, no matter what person's of bus and line side phase angle is leading, controlled adjuster sends regulating impulse automatically, make the converter of the leading side of phase place be in the rectification operating state, make the converter of phase lag side be in the inversion operating state, carry out a certain amount of load transmission from a side direction phase angle of the phase angular advance side that lags, so that phase angle difference narrows down to when satisfying looped network condition arranged side by side between bus and the circuit, controlled adjuster sends closing pulse automatically closes a floodgate the gate out switch of circuit, automatically it is arranged side by side to finish looped network apace, send the switch that the tripping operation pulse disconnects system arranged side by side both sides subsequently, turn-off the trigger impulse of converter.
In addition, the line failure of sending in the power plant, after the unsuccessful permanent tripping operation of reclosing action, often pass through a unit list tape jam circuit in power plant, apply the voltage of starting from scratch and raising gradually, circuit is carried out zero rises and boost, according to the variation of each electric parameters in the pressure process of rising progressively judge whether be permanent fault, failure judgement mutually and the distance of fault point, this is a method commonly used in the power plant.But for away from breaking down on the interconnection between the load-center substation in power plant, the reclosing baulk behind the line tripping, because there is not pressurized equipment, just can't adopt zero to work the way of boosting.Often adopting once more send the way of electricity to judge whether it is permanent fault by force to faulty line.In case this sending by force sent by force in the permanent fault circuit, the destructiveness aggravation of fault point will be made, send by force when permanent fault simultaneously and can produce strong system shock, can cause certain destruction and harmful effect once more, when serious system stability is destroyed the equipment of electric power system.With second class system arranged side by side, just can in transformer station, carry out zero and boost faulty line.Also can carry out the pressure build-up test of other type to circuit.That is:
The method of in a kind of transformer station circuit being boosted, it is characterized in that: system arranged side by side carries out pressure build-up test to circuit with above-mentioned second class, the switch of the system arranged side by side of closing both sides system arranged side by side is connected in bus and the circuit that tripped between, controlled adjuster makes the bus bar side converter be in the rectification operating state, make the converter in line side be in the inversion operating state, under artificial control, apply the power-frequency voltage of an aequum to circuit.In the time of need carrying out the test of short circuit up-flow to circuit, also available second class system arranged side by side finishes.That is:
A kind of method of circuit being carried out the up-flow test, it is characterized in that: circuit is carried out the up-flow test with above-mentioned second class system arranged side by side, earlier artificially established the three-phase shortcircuit line in the outlet of up-flow circuit, the switch of the system arranged side by side of closing again both sides is connected in bus with system arranged side by side and desires to carry out between the circuit of up-flow test, controlled adjuster makes the bus bar side converter be in the rectification operating state, make the converter in line side be in the inversion operating state, under artificial control, apply the power frequency short circuit current of an aequum to circuit.
In first kind system arranged side by side, converter transformer has step-down and isolates double action.In second class system arranged side by side, full control power electronic device itself has buffer action, converter transformer only plays the step-down effect, so, in second class system arranged side by side, the also available partial pressure type power capacitor of converter transformer substitutes, or when the operating voltage of the alternating voltage of electrical network and system arranged side by side near the time, converter transformer can save.
In second class system arranged side by side, filter is used for eliminating the high order harmonic component that exchanges after the inversion, and side by side system generally be in process side by side the short time devote oneself to work, high order harmonic component is little to the influence of system, filter can be saved.
Rectification in the above-mentioned two classes system arranged side by side and inversion transformation technique (PCC and PWM control technology) have been widely used in high voltage direct current transmission project, and the effect of each technical characterictic and control method are no longer superfluous to be stated.
The present invention has following beneficial effect:
The first, do not satisfying under the condition situation same period, at first two electrical networks are connected fast with system arranged side by side, to hanging down all electrical network transmission loads, recover low all mains frequencies fast, help eliminating system oscillation, prevent accident expansion.
The second, the quick transmission along with meritorious can make between two electrical networks and can satisfy the synchronization paralleling condition fast, realizes that fast automatic presynchronization is arranged side by side.The fastest of parallel operation can be finished in tens of seconds, and be very quick; The automaticity of parallel operation improves greatly; Independently finish in the load-center substation, no longer need scheduling, frequency modulation power plant to participate in, security reliability improves greatly.
Three, when the looped network parallel operation, earlier by controllable silicon system transmissions sub-load arranged side by side, reduce the phase angle difference of point side by side, finish the looped network operation fast.Also only need the load-center substation independently to finish, and do not need system call that the trend of system is adjusted, safety, quick, reliable.Do not need to the user interruption of power supply yet.
Four, this system arranged side by side also can be used for boosting and the up-flow test to circuit.At present, when circuit is carried out up-flow, pressure build-up test, must just can be carried out to the scene by special testing crew carrying large testing equipment, side by side the double simultaneously up-flow equipment that boosts of doing of system can make things convenient for the experiment work at scene greatly.
Description of drawings
Fig. 1 is the schematic diagram of the first kind system arranged side by side that forms of converter that controllable silicon constitutes
Fig. 2 is the system arranged side by side that six groups of thyristor inverter units in series are formed
Fig. 3 is the winding diagram of three groups of thyristor inverter unit shared one group of converter transformer in parallel
Fig. 4 is the theory diagram of controlled adjuster TJQ in the first kind system arranged side by side
Fig. 5 is the second class system arranged side by side single line schematic diagram that is made of full control power electronic device converter
Fig. 6 is a winding diagram of controlling the converter of power electronic device formation entirely
Fig. 7 is the control principle block diagram of second class system arranged side by side
Fig. 8 is the applicating example of system arranged side by side in the transformer station of half as much again wiring
Fig. 9 is the applicating example of system arranged side by side in the other mother's of double-bus band transformer station
Among the figure: M is a bus of transformer station, L (and numbering) represents circuit, DL (afterwards adding numbering) represents line switching, 1DL and 2DL are and the switch of array apparatus both sides, B1 and B2 are converter transformers, HLQ1 and HLQ2 represent two groups of converters, DK is a reactor, and TJQ represents controlled adjuster, the converter trigger impulse that on behalf of adjuster, CFMC send, CLXH represents measuring-signal, on behalf of controlled adjuster, THMC give the jumping of switch, closing pulse, KKGBL are represented the block diagram of whole system arranged side by side, and LB represents filter, C represents electric capacity of voltage regulation, and G (and numbering) represents isolation switch.
Embodiment
Fig. 1 is the schematic diagram of the first kind system arranged side by side that forms of converter that controllable silicon constitutes.Among the figure, two switch 1DL and 2DL, two converter transformer B1 and B2, two groups of thyristor inverter HLQ1 and HLQ2, one group of smoothing reactor DK and controlled adjuster TJQ have constituted controllable silicon system arranged side by side.The DC side of the two groups of converters peace ripple reactance three head and the tail annular closed-loop path that is electrically connected to form successively, the AC side of 1 group of converter HLQ1 links to each other with bus M by converter transformer B1, switch 1DL, the AC side of 2 groups of converter HLQ2 is connected with circuit L with switch 2DL by converter transformer B2, and whole system arranged side by side works under the regulating and controlling of controlled adjuster TJQ.
Switch 1DL, the 2DL of system both sides are primary cut-outs side by side, can only select one group in practice, and another group replaces with disconnecting link; Or with transformer station in existing switch, disconnecting link be used, system also can not establish the switch of its two Side side by side.
When needing to carry out synchronization paralleling between bus and the circuit, the switch 1DL of the system arranged side by side of closing both sides, 2DL, system arranged side by side is inserted between bus M and the circuit L, no matter bus and line side either party be high all electrical networks, the measuring-signal CLXH of controlled adjuster takes from the voltage transformer of bus and circuit respectively, controlled adjuster TJQ is by measuring the voltage of bus and circuit, frequency, parameters such as phase angle, send trigger impulse CFMC from the trend thyristor inverter, make the converter of high all sides be in the rectification operating state, make the converter of low all sides be in the inversion operating state, the AC rectification of all sides of height is become direct current, the converter that direct current flows through low all sides is reverse into low all side frequencies again and equates, the alternating current that the phase angle is identical, realization is by the load transmission of all electrical networks of height to low all electrical networks, the size that load transmits is so that bus and circuit satisfy the synchronization paralleling condition is purpose, when the moment that the same period, condition satisfied, controlled adjuster sends closing pulse from trend line switching DL, realize the fast automatic quasi-synchronization paralleling between circuit and the bus, thereupon again to the switch 1DL of system arranged side by side both sides, 2DL sends tripping operation pulse tripping both sides switch, and close the silicon controlled trigger impulse, whole process arranged side by side is finished fast.
When needing to carry out looped network between bus M and the circuit L when arranged side by side, although, frequency less in line switching DL both sides voltage difference equates that occurring bigger phase angle difference sometimes can't encircle also.The switch 1DL of system arranged side by side both sides closes this moment, 2DL, system arranged side by side is linked between bus M and the circuit L, controlled adjuster is measured the phase angle of bus and circuit automatically, make the converter of the leading side in phase angle be in the rectification operating state, the lag converter of a side of phase angle is in the inversion operating state, load from the side hop that the leading side direction of phase place lags, transmission quantity what so that the phase angle difference of line switching DL both sides narrow down in the time of satisfying looped network condition arranged side by side, controlled adjuster sends closing pulse automatically makes line switching DL combined floodgate finish the looped network parallel operation, send the switch 1DL that the tripping operation pulse disconnects system arranged side by side both sides subsequently, 2DL, and close the silicon controlled trigger impulse, ring and operation are finished rapidly.
More than according to Fig. 1 the principle of controllable silicon system arranged side by side is narrated, every group only has a three phase full bridge controllable silicon inverter unit in two groups of converters.And in the practical application,, need a plurality of inverter unit series and parallels in order to improve through-put power.
Fig. 2 is the system wiring figure arranged side by side (the regulating and controlling part is not drawn) that six groups of thyristor inverter units in series are formed.What of inverter unit quantity are determined according to the watt level that will transmit.
Fig. 3 is the winding diagram of three groups of thyristor inverter unit shared one group of converter transformer in parallel.What of inverter unit quantity in parallel are determined according to the watt level that will transmit.The public converter transformer of many group converters can reduce cost.Side by side system all is to devote oneself to work the short time being used for processes such as synchronization paralleling, looped network be arranged side by side, and this wiring is more practical.
Fig. 4 is the theory diagram of controlled adjuster TJQ in the first kind system arranged side by side.Show to form by identifying central processing unit, the same period unit, switch control unit, pulse-triggered unit, the same period.Measuring-signal CLXH is respectively from the voltage transformer of bus and circuit.Identify that the unit is used for the voltage difference of comparison bus and circuit, difference on the frequency, phase angle difference the same period.Central processing unit is controlled the work of each unit according to the signal of identifying the unit same period and the instruction of input in advance.The pulse signal CFMC of control thyristor inverter is responsible for producing in the pulse-triggered unit.Switch control unit is responsible for sending breaker tripping and closing signal THMC to the switch of two Side of system arranged side by side and circuit switch arranged side by side in good time.The same period, table can be indicated difference on the frequency, voltage difference and the phase angle difference between bus and the circuit, helped artificial follow-up work process.The The whole control adjuster has two kinds of mode of operations: synchronization paralleling, looped network are arranged side by side.
Fig. 5 is the second class system arranged side by side single line schematic diagram that is made of full control power electronic device converter.Reversible rectification---the inverter circuit that two groups of converter HLQ1, HLQ2 and electric capacity of voltage regulation constitute, the AC side of one group of converter HLQ1 is connected with bus by one group of reactor DK1+R1, converter transformer B1, high-voltage switch gear 1DL, the AC side of two groups of converter HLQ2 is connected with circuit by two groups of reactor DK2+R2, converter transformer B2, high-voltage switch gear 2DL, respectively inserts one group of filter LB between the converter transformer of both sides and the reactor and constitutes second class system arranged side by side.
The commutation technique of converter and control technology have applied to high voltage direct current transmission project on a large scale in second class system arranged side by side, and concrete ins and outs are stated with its SPWM control method is no longer superfluous.Converter transformer wherein has only hypotensive effect, can substitute with the dividing potential drop power capacitor, and at grid ac voltage with when the operating voltage of system is close side by side, converter transformer also can save.
Switch 1DL, the 2DL of system both sides are primary cut-outs side by side, can only select one group in practice, and another group replaces with disconnecting link; Or with transformer station in existing switch, disconnecting link be used, system also can not establish the switch of its two Side side by side.
In second class system arranged side by side, pulse width modulating technology of the prior art (SPWM) is adopted in inversion, contain a certain amount of high order harmonic component in the interchange after the inversion, respectively insert one group of filter LB between the converter transformer of both sides and the reactor and be used to eliminate high order harmonic component, but consider high order harmonic component to the more weak and arranged side by side system of the influence of system just in process side by side the short time devote oneself to work, in order to reduce cost, filter LB also can save.
When the utilization second class converter carries out synchronization paralleling, no matter what side of bus bar side and line side is high all systems, controlled adjuster (not drawing among the figure) makes the converter of high all sides be in the rectification operating state, low all side converters are in the inversion operating state, realize of the load transmission of high all electrical networks to low all electrical networks, when treating that the same period, condition satisfied, controlled adjuster sends closing pulse automatically closes a floodgate line switching DL, finish fast automatic quasi-synchronization paralleling, the both sides switch of tripping system arranged side by side, shutoff converter withdraw from system arranged side by side automatically again.
Equally, when using second class system arranged side by side that circuit is encircled and operates, no matter the phase angle of what side of bus bar side and line side is leading, controlled adjuster (not drawing among the figure) makes the converter of the leading side in phase angle be in the rectification operating state, phase lag side converter is in the inversion operating state, realize the lag load transmission of side of leading side direction, when treating that the same period, condition satisfied, controlled adjuster sends closing pulse automatically closes a floodgate line switching DL, it is arranged side by side to finish fast looped network, the both sides switch of tripping system arranged side by side, shutoff converter withdraw from system arranged side by side automatically again.
In addition, L breaks down when circuit, and after the reclosing baulk, also available second class system arranged side by side carries out zero to circuit and boosts.Both sides switch 1DL, the 2DL of the system arranged side by side of closing inserts system arranged side by side between bus and the circuit, make bus bar side converter HLQ1 be in the rectification operating state by controlled adjuster, line side converter HLQ2 is in the inversion operating state, apply a power-frequency voltage of rising progressively gradually on the line by zero beginning, artificial boost process and the voltage and current situation of change of observing circuit simultaneously controlled.When circuit is permanent fault, apply a less voltage on the line, will produce bigger electric current, the relevant protection (as distance protection) of circuit will would trip, but or the people when being judged as permanent fault also the people for stopping pressurization.If the fault of tripping operation circuit is eliminated, by improve gradually impose on circuit voltage up to rated voltage, line current still less (charging current) illustrates that circuit is intact and can add operation.The pressure process of rising progressively is finished, and recovers the normal connection of circuit.In like manner, also can carry out the pressure build-up test of other type to circuit.
Also available second class system arranged side by side carries out the up-flow test to circuit.Establish three short-circuit lines earlier in the exit of circuit, both sides switch DL1, the DL2 of the system arranged side by side of closing again inserts system arranged side by side between bus and the circuit, make bus bar side converter HLQ1 be in the rectification operating state by controlled adjuster, line side converter HLQ2 is in the inversion operating state, apply a power frequency short circuit current to circuit, the big I of electric current is artificially controlled, and maximum can arrive the rated current of circuit.
The physical cabling figure of the converter that Fig. 6 is made up of full control such as GTO, IGBT, IGCT power electronic device.Fig. 6 (a) is for being two level topological structures, and Fig. 6 (b) is three level topological structures, and Fig. 6 (c) is the cascaded structure of device, and the number of power electronic device series connection is by the decision of transmission capacity size.Also can adopt the mode of a plurality of inverter unit parallel connections to increase transmission capacity, no longer superfluous stating.
Fig. 7 is the control principle block diagram of fully controlled bridge system arranged side by side
When carrying out synchronization paralleling, allow high all side converters be in the rectification operating state and to adopt the direct voltage control model, low all side converters are in the inversion operating state and adopt active power and reactive power (or alternating voltage) control model, and making the transmission of power is purpose to satisfy the synchronization paralleling condition.
When carrying out looped network when arranged side by side, allow the converter of the leading side of phase place be in the rectification operating state and to adopt the direct voltage control model, the converter of phase lag side is in the inversion operating state and adopts active power and reactive power (or alternating voltage) control model, and making the transmission of power satisfy looped network condition arranged side by side to dwindle phase difference and voltage difference is purpose.
When circuit was carried out pressure build-up test, the bus bar side converter was in the rectification operating state and adopts the direct voltage control model, and the converter in line side is in the inversion operating state and adopts the alternating voltage control model, applies the power-frequency voltage of a specified rate to circuit.
When circuit being carried out the up-flow test, the converter of bus bar side is in the rectification operating state and adopts the direct voltage control model, the converter in line side is in inversion work and adopts the Reactive Power Control pattern, applies the power current of a given magnitude of current to circuit.
The table same period among Fig. 7 is used for artificially monitoring process arranged side by side at system work process arranged side by side.
In addition, in actual applications, there are many outlets in each transformer station, is in economic consideration, only installs the public system arranged side by side of a cover in the transformer station and gets final product.Below provide the applicating example in the different transformer station's wiring of two examples.
Fig. 8 is the applicating example of system arranged side by side in the transformer station of half as much again wiring.The half as much again wiring is the mode of connection the most frequently used in the transformer station.Among the figure with the 3rd circuit L3 as and the object arranged side by side of bus, before being carried out parallel operation, circuit L3 earlier other 5 circuits are all poured into article one bus M1 operation, second bus M2 is vacated, be the DL12 in the fragmentary, DL22 and DL03,1DL and DL32 among the figure close, system KKGBL arranged side by side is sealed between article one bus M1 and the circuit L3, be implemented in the quick load transmission between article one bus M1 and the circuit L3, satisfy synchronization paralleling conditioned disjunction looped network condition arranged side by side fast, the satisfied moment of condition closes a switch the DL03 realization automatically side by side automatically side by side, tripping switch 1DL also closes the trigger impulse of converter, the same period, process finished, the normal connection that recovers two buses again.Also can carrying out as a rule side by side of other several circuits, difference are that as L4, L5, when the L6 three-line need carry out synchronization paralleling with bus, the M2 that turns gets final product as L1, L2, turned letter M1 when the L3 three-line need carry out parallel operation with bus.Turned letter bus and recover the process of normal wiring, if finish automatically by computer supervisory control system, quick, safety.Use second class system arranged side by side boost and the up-flow test method roughly the same, no longer repeat.
Fig. 9 is the applicating example of system arranged side by side in the transformer station of the other female wiring of double-bus band.In this mode of connection, other mother generally vacates standby, and promptly the isolation switch between line side and the other mother generally all is in off-state.Among the figure with circuit L4 as arranged side by side object, DL4 is in off-state, isolation switch G, the switch 1DL of isolation switch G4 and array apparatus outlet and the disconnecting link of 1DL one female side or two female sides only need close during parallel operation, system KKGBL arranged side by side is sealed between M1 (or M2) and the circuit L4 transmission of between bus and circuit L4, loading, the moment of satisfying condition arranged side by side, line switching DL4 closes, cut-off switch 1DL closes the converter trigger impulse in the system arranged side by side subsequently, finishes side by side.The parallel operation method of other several circuits roughly the same.The method of attachment of carrying out up-flow, pressure build-up test is identical, no longer superfluous stating.
In the transformer station of the various different modes of connection, all can manage shared cover system arranged side by side.
Claims (9)
1. the system side by side fast between the electrical network, it is characterized in that: have the DC side of two groups of thyristor inverters and at least one group of smoothing reactor three's the head and the tail annular closed-loop path that is electrically connected to form successively at least, wherein the AC side of one group of converter is electrically connected on the bus of transformer station by a converter transformer and a switch, the AC side of another group converter by another converter transformer and another switch be electrically connected on one treat and circuit on, a controlled adjuster comes the work of regulating and controlling thyristor inverter and switch.
2. the system side by side fast between the electrical network, it is characterized in that: the DC side that has two groups of converters of being made up of full control power electronic device GTO or IGBT or IGCT at least is through the electric capacity of voltage regulation of parallel connection reversible rectification---the inversion circuit that is electrically connected to form, the AC side of first group of converter is through one group of reactor, converter transformer, switch links to each other with the bus of transformer station, the AC side of second group of converter is organized reactor through another, another group converter transformer and another switch with treat that also circuit links to each other, between two groups of converter transformers and the reactor, each adds one group of filter, and by a cover controlled adjuster control whole system operation.
3. the quick synchronization paralleling method between the electrical network, it is characterized in that: with claim 1 or the described system arranged side by side of claim 2 to the bus of transformer station with treat and circuit carries out synchronization paralleling, the switch of the system arranged side by side of closing earlier both sides is connected in bus with system arranged side by side and treats also between the circuit, no matter what person of bus and circuit belongs to high all electrical networks, controlled adjuster sends regulating impulse from the trend converter, make the converter of high all sides be in the rectification operating state, make the converter of low all sides be in the inversion operating state, from all electrical networks of height to the transmission of loading of low all electrical networks, so that when satisfying the synchronization paralleling condition rapidly between bus and the circuit, controlled adjuster sends closing pulse automatically closes a floodgate the gate out switch of circuit, it is arranged side by side to finish automatic presynchronization, send the switch that the tripping operation pulse disconnects system arranged side by side both sides subsequently, close the trigger impulse of converter.
4. the fast looped network paralleling method between the electrical network, it is characterized in that: it is arranged side by side with claim 1 or the described system arranged side by side of claim 2 bus of transformer station and circuit to be carried out looped network, the switch of the system arranged side by side of closing earlier both sides is connected in bus with system arranged side by side and treats also between the circuit, no matter what person's of bus and circuit phase angle is leading, controlled adjuster sends regulating impulse from the trend converter, make the converter of the leading side of phase place be in the rectification operating state, make the converter of phase lag side be in the inversion operating state, from the side transmission of loading that lags of a side direction phase angle of phase angular advance, when phase angle difference being narrowed down to satisfy looped network condition arranged side by side, controlled adjuster sends closing pulse from the gate out switch of trend circuit, automatically it is arranged side by side to finish looped network, send the switch that the tripping operation pulse disconnects system arranged side by side both sides subsequently, close the trigger impulse of converter.
5. method that circuit is boosted, it is characterized in that: described system arranged side by side boosts to circuit with claim 2, the switch of the system arranged side by side of closing both sides is connected in system arranged side by side between bus and the circuit to be pressurizeed, controlled adjuster makes the bus bar side converter be in the rectification operating state, make the converter in line side be in the inversion operating state, under artificial control, apply the power-frequency voltage of an aequum to circuit.
6. method of circuit being carried out up-flow test, it is characterized in that: circuit is carried out the up-flow test with the described system arranged side by side of claim 2, earlier artificially established the three-phase shortcircuit line in the outlet of up-flow circuit, the switch of the system arranged side by side of closing again both sides is connected in bus with system arranged side by side and desires to carry out between the circuit of up-flow test, controlled adjuster makes the bus bar side converter be in the rectification operating state, make the converter in line side be in the inversion operating state, under artificial control, apply the power frequency short circuit current of an aequum to circuit.
7. the described converter transformer of claim 2 is characterized in that and can substitute or save with the partial pressure type power capacitor.
8. the described filter of claim 2 is characterized in that and can save from system arranged side by side.
9. the described switch of claim 1 and claim 2, it is characterized in that primary cut-out, in actual applications can be according to different situations, wherein one is substituted with isolation switch, or the switch of system arranged side by side both sides saved, make that existing switch is used in system arranged side by side and the transformer station.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA200710149367XA CN101141069A (en) | 2007-09-11 | 2007-09-11 | quick-speed synchronization parallelly-arranged system between electric networks and method of use thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CNA200710149367XA CN101141069A (en) | 2007-09-11 | 2007-09-11 | quick-speed synchronization parallelly-arranged system between electric networks and method of use thereof |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102751781A (en) * | 2012-07-11 | 2012-10-24 | 北京国能子金电气技术有限公司 | Stand-by power supply on-line device |
| CN102928699A (en) * | 2012-05-28 | 2013-02-13 | 清华大学 | Converter synchronization experiment system and method |
| CN110492354A (en) * | 2019-08-28 | 2019-11-22 | 西安长庆科技工程有限责任公司 | A kind of Oil Field Substation 35kV hospital bus bar device and its application method |
| CN111478188A (en) * | 2020-04-01 | 2020-07-31 | 南京合智电力科技有限公司 | Intelligent high-voltage switch |
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2007
- 2007-09-11 CN CNA200710149367XA patent/CN101141069A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102928699A (en) * | 2012-05-28 | 2013-02-13 | 清华大学 | Converter synchronization experiment system and method |
| CN102928699B (en) * | 2012-05-28 | 2015-03-04 | 清华大学 | Converter synchronization experiment system and method |
| CN102751781A (en) * | 2012-07-11 | 2012-10-24 | 北京国能子金电气技术有限公司 | Stand-by power supply on-line device |
| CN110492354A (en) * | 2019-08-28 | 2019-11-22 | 西安长庆科技工程有限责任公司 | A kind of Oil Field Substation 35kV hospital bus bar device and its application method |
| CN110492354B (en) * | 2019-08-28 | 2024-02-06 | 西安长庆科技工程有限责任公司 | 35kV bypass bus device of oil field transformer substation and application method thereof |
| CN111478188A (en) * | 2020-04-01 | 2020-07-31 | 南京合智电力科技有限公司 | Intelligent high-voltage switch |
| CN111478188B (en) * | 2020-04-01 | 2022-12-20 | 南京合智电力科技有限公司 | Intelligent high-voltage switch |
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