CN104852401B - A kind of Hybrid HVDC system, control method and trend reversion control method - Google Patents
A kind of Hybrid HVDC system, control method and trend reversion control method Download PDFInfo
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- CN104852401B CN104852401B CN201510295735.6A CN201510295735A CN104852401B CN 104852401 B CN104852401 B CN 104852401B CN 201510295735 A CN201510295735 A CN 201510295735A CN 104852401 B CN104852401 B CN 104852401B
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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
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Abstract
The invention discloses a kind of Hybrid HVDC system, first group of thyristor converter device unit and second group of thyristor converter device unit connect same sending end AC network by transformer respectively, or connect different sending end AC networks respectively；Inversion current conversion station is made up of at least one set of voltage source converter, its positive and negative two ends DC line is respectively provided with first switch element, 4th switch element, while in positive and negative two ends DC line again respectively by second switch element, the parallel connection of the 3rd switch element, which intersects, to be wired on the DC line of opposite end；Two ends current conversion station is connected by two DC lines.The invention also discloses Hybrid HVDC system control method and Hybrid HVDC system load flow reversion control method.The present invention has the advantages of Traditional DC low cost and flexible flexible direct current control concurrently.
Description
Technical field
The present invention relates to Hybrid HVDC field, more particularly to a kind of Hybrid HVDC system, control method and tide
Stream reversion control method.
Background technology
HVDC transmission system can be divided into two types：Traditional DC transmission system (LCC- based on IGCT technology
HVDC)；Flexible direct current power transmission system (Flexible-HVDC) based on all-controlling power electronics device technology.Traditional DC is defeated
Electric system (LCC-HVDC) low cost, is lost small, running technology maturation, at present, the DC transmission system being currently running in the world
Nearly all it is LCC-HVDC systems, but there is the easy commutation failure of inverter side in Traditional DC transmission system (LCC-HVDC), to exchange
The dependence of system is strong；Absorb a large amount of idle, the shortcomings of current conversion station floor space is big.And the flexible direct current power transmission system of a new generation
(Flexible-HVDC) can then realize active power and reactive power uneoupled control, can be powered to passive network, structure it is tight
Floor space of gathering is small, in the absence of commutation failure failure the advantages of, but there is also with high costs, it is impossible to effective processing DC side therefore
The defects such as barrier.Therefore transmitted electricity with reference to Traditional DC and the Hybrid HVDC of flexible DC power transmission there will be future in engineering applications.
Hybrid HVDC system one end of the present invention is the LCC-HVDC based on IGCT technology, and one end is full-control type electric power electricity
The voltage source converter that sub- device is constituted, the topological structure of two-terminal direct current transmission system is mixed at present mainly to be had as shown in Figure 1
Symmetrical monopolar wiring mixing two-terminal direct current transmission system and Fig. 2 shown in symmetrical bipolar wiring mixing two-terminal DC transmission system
The position of voltage source converter and LCC-HVDC in system, Fig. 1 or Fig. 2 can be exchanged.The system combines Traditional DC
Transmission losses is small, running technology is ripe and flexible DC power transmission can power to passive network, will not occur commutation failure
Advantage, but there is also following shortcoming：Transverter can not be made full use of, is realized in the optimal control of trend, system as shown in Figure 1
If a thyristor converter device failure, due to lacking current path, the conveying of whole system power will be forced to interrupt.Due to tradition
The transverter of direct current uses thyristor converter device, and the sense of current can not change, and trend can only change polarity of voltage when inverting, and
Voltage source converter trend can only change DC current direction, can not change DC voltage polarity when inverting, therefore mixing two
The trend of end DC transmission system can not typically change.In addition when needing to exchange power by direct current between multiple AC networks
When, system as shown in Figure 1 is accessed according to thyristor converter device, three end systems are formed, then needs the extra brilliant lock of increase by two
Pipe transverter, adds additional investment.
The content of the invention
The purpose of the present invention：It is that a kind of Hybrid HVDC system, control method and trend reversion control method are provided,
The advantage of the direct current transportation topology based on thyristor converter device and based on voltage source converter is combined, can make full use of and change
Stream device realizes the Optimum utilization of trend.
In order to reach above-mentioned purpose, solution of the invention is：A kind of Hybrid HVDC system, including for connecting
The sending end current conversion station of sending end AC network, the receiving end current conversion station for connecting receiving end AC network and for connecting the sending end change of current
The DC power transmission line stood with receiving end current conversion station；It is characterized in that：The sending end current conversion station is rectification current conversion station, receiving end current conversion station
For inversion current conversion station；The rectification current conversion station is used to be converted to the three-phase alternating current of sending end AC network after direct current by straight
Stream transmission line of electricity sends inversion current conversion station to；The inversion current conversion station is used to be converted in direct current be conveyed to after three-phase alternating current
Receiving end AC network；First group of thyristor converter device unit that the rectification current conversion station includes being in series is changed with second group of IGCT
Flow device unit；First group of thyristor converter device unit is connected earthing pole with the series connection node of second group of thyristor converter device unit,
Or it is not connected to earthing pole；First group of thyristor converter device unit and second group of thyristor converter device unit pass through transformer respectively
Connect sending end AC network.Same AC network, or an AC network is connected respectively；
Inversion current conversion station connects receiving end AC network by transformer；Inversion current conversion station is by least one set of voltage-source type change of current
Device is constituted, and the positive and negative two ends of voltage source converter are respectively provided with first switch element S1 and the 4th switch element S4, while just
Negative two-terminal DC transmission system circuit is intersected by second switch element S2 and the 3rd switch element S3 parallel connections respectively again is wired to opposite end
On DC power transmission line.
As further improved technical scheme of the present invention, first group of thyristor converter device unit and second group of IGCT are changed
Stream device unit connects same sending end AC network by transformer respectively, or connects different sending end AC networks respectively.
As further improved technical scheme of the present invention, the thyristor converter device unit includes thyristor controlled series compensation；Or
Person is connected in parallel including thyristor controlled series compensation with bypass cock；Or including thyristor controlled series compensation and bypass cock and disconnecting link component, it is brilliant
Brake tube valve group is connected in parallel with bypass cock, and the one end of the unit two ends after parallel connection respectively with connection disconnecting link is connected, and connects disconnecting link
The other end parallel connection bypass disconnecting link.
As further improved technical scheme of the present invention, the thyristor controlled series compensation is six pulsation bridge circuits, Huo Zheshi
Two pulsation bridge circuits, or double 12 pulsation bridge circuits；The voltage source converter is two level converters, or diode
Clamp three-level converter, or modularization multi-level converter MMC, or mixed multi-level transverter HMC or the electricity of tandem type two
Flat transverter CTL.
As further improved technical scheme of the present invention, when two groups of thyristor converter device units being in series are at it
In one when breaking down, another can be exited online, or be exited offline；It is out of service in a thyristor converter device unit
Afterwards, to remain on pattern constant for the voltage source converter of inversion current conversion station, or enters buck operating mode.
As further improved technical scheme of the present invention, the switch element refers to isolation switch, or dc circuit breaker,
Or the combination of isolation switch and both dc circuit breakers.
As further improved technical scheme of the present invention, flat ripple is mounted at the positive and negative two ends of voltage source converter
Reactor；The switch element (S1, S4) of the same position installed in positive and negative two-terminal DC transmission system circuit can both be installed
Between smoothing reactor and transverter, it can also be arranged between DC power transmission line and smoothing reactor.
To realize above-mentioned technical purpose, another technical scheme that the present invention takes is：It is a kind of to use above-mentioned mixing straight
Flow the Hybrid HVDC system control method of transmission system, it is characterised in that：
According to operation needs, first switch element S1, the switch element S3 of second switch element S2 the 3rd, the 4th switch are operated
Element S4, formed by first group of thyristor converter device unit and second group of thyristor converter device unit constituted it is first defeated
Electric system, and form the second transmission of electricity being made up of the voltage source converter and at least one set of thyristor converter device unit
System；
First group of thyristor converter device unit is connected to different AC networks from second group of thyristor converter device unit；It is described
First switch element S1 is closed to be closed with second switch element S2, and the 3rd switch element S3 disconnects to be disconnected with the 4th switch element S4
Form the first current path；Or first switch element S1 disconnects and disconnected with second switch element S2, the 3rd switch element S3 is closed
Close and close to form the second current path with the 4th switch element S4；
First group of thyristor converter device unit is rectification unit or inversion unit；
Second group of thyristor converter device unit is inversion unit or rectification unit；And
Active power connects AC network via first group of IGCT from first group of thyristor converter device unit
Inverter unit and second group of thyristor converter device unit, which are transmitted to second group of thyristor converter device unit, even to be handed over
Flow power network；Or active power connects AC network via described second group brilliant lock from second group of thyristor converter device unit
Pipe inverter unit and first group of thyristor converter device unit, which are transmitted to first group of thyristor converter device unit, to be connected
AC network.
To realize above-mentioned technical purpose, another technical scheme that the present invention takes is：It is a kind of to use above-mentioned mixing straight
Flow the Hybrid HVDC system load flow reversion control method of transmission system, it is characterised in that：
Step one：Reduce the dc power of straight-flow system；
Step 2：The DC current of straight-flow system is down to zero；
Step 3：First switch element S1, the 4th switch element S4 on positive and negative two ends DC line are disconnected, is closed at
Parallel connection intersects second switch element S2, the 3rd switch element S3 being wired on the DC line of opposite end, or disconnects in parallel intersect
Second switch element S2, the 3rd switch element S3 on the DC line of opposite end are wired to, positive and negative two ends DC line is closed at
On first switch element S1, the 4th switch element S4, invert straight-flow system DC voltage polarity；
Step 4：Voltage source converter is rectification unit/inversion unit, and first group of inverter unit constitutes inversion list
Member/rectification unit；Or second group of inverter unit constitutes inversion unit/rectification unit；Or first group of inverter unit with
Second group of inverter unit collectively forms inversion unit/rectification unit.
As further improved technical scheme of the present invention, the type change of current of off voltage source is needed before DC voltage polarity reversion
Device connects transformer primary side AC circuit breaker；Or be not required to off voltage source type transverter to connect the exchange of transformer primary side disconnected
Road device.
Beneficial effects of the present invention：
1. the advantages of topological structure of the present invention has traditional thyristors transverter low cost concurrently, is lost low, highly reliable, with
And voltage source converter control is flexible, active reactive power decoupled is controlled, to the low advantage of AC system dependence；Wherein brilliant lock
Pipe transverter can realize that online and offline throwing is moved back, with higher reliability.
2. using the control method of the present invention existing transverter can be made full use of to realize the trend conveying of each power network, both saved
Investment has been saved, the safety of whole power network is also improved.
Brief description of the drawings
Fig. 1 is the mixing two-terminal direct current transmission system schematic diagram of symmetrical monopolar wiring.
Fig. 2 is the mixing two-terminal direct current transmission system schematic diagram of symmetrical bipolar wiring.
A kind of sending end that Fig. 3 is the present invention is located at different power networks, and using thyristor converter device, receiving end uses voltage source converter
The Hybrid HVDC system schematic that device is constituted.
A kind of sending end that Fig. 4 is the present invention is located at identical power network, and using thyristor converter device, receiving end uses voltage source converter
The Hybrid HVDC system schematic that device is constituted.
A kind of sending end that Fig. 5 is the present invention is voltage source converter, and receiving end is located at identical power network, using thyristor converter device
The Hybrid HVDC system schematic of composition.
A kind of sending end that Fig. 6 is the present invention is voltage source converter, and receiving end is located at different power networks, using thyristor converter device
The Hybrid HVDC system schematic of composition.
Fig. 7 is the thyristor converter device cellular construction schematic diagram of the present invention.
Embodiment
Below with reference to accompanying drawing, technical scheme and beneficial effect are described in detail.
The invention provides a kind of Hybrid HVDC system and control method, while suitable for mixing as shown in Figure 3
AC network G1, AC network G2 in direct current transportation topological structure and the topological structure shown in Fig. 4, Fig. 5, Fig. 6, each figure, are handed over
Stream power network G3 represents different AC networks respectively, and each corresponding equiva lent impedance of AC network is respectively：Zs1, Zs2, Zs3.Under
Face is illustrated by taking Fig. 3 as an example.
Embodiment 1：
Referring to Fig. 3, a kind of this Hybrid HVDC system, including for connect sending end AC network sending end current conversion station,
For connecting the receiving end current conversion station of receiving end AC network and direct current transportation for connecting sending end current conversion station and receiving end current conversion station
Circuit；It is characterized in that：The sending end current conversion station is rectification current conversion station, and receiving end current conversion station is inversion current conversion station；The rectification is changed
Stream station, which is used to be converted to the three-phase alternating current of sending end AC network after direct current, send inverse transformation to by DC power transmission line
Stream station；The inversion current conversion station is used to be converted in direct current be conveyed to after three-phase alternating current receiving end AC network；The rectification
Current conversion station includes the first group of thyristor converter device unit and second group of thyristor converter device unit being in series；First group of IGCT
Inverter unit is connected earthing pole with the series connection node of second group of thyristor converter device unit, or is not connected to earthing pole；First
Group thyristor converter device unit and second group of thyristor converter device unit connect sending end AC network by transformer respectively.It is same
Individual AC network, or an AC network is connected respectively；
Inversion current conversion station connects receiving end AC network by transformer；Inversion current conversion station is by least one set of voltage-source type change of current
Device is constituted, and the positive and negative two ends of voltage source converter are respectively provided with first switch element S1 and the 4th switch element S4, while just
Negative two-terminal DC transmission system circuit is intersected by second switch element S2 and the 3rd switch element S3 parallel connections respectively again is wired to opposite end
On DC power transmission line.
Preferably, first group of thyristor converter device unit and second group of thyristor converter device unit are respectively by becoming
Depressor connects same sending end AC network, and different sending end AC networks are connected respectively.The thyristor converter device unit bag
Include thyristor controlled series compensation；Or be connected in parallel including thyristor controlled series compensation with bypass cock；Or opened including thyristor controlled series compensation with bypass
Close and disconnecting link component, thyristor controlled series compensation is connected in parallel with bypass cock, it is in parallel after unit two ends respectively with connect the one of disconnecting link
End is connected, and connects the other end parallel connection bypass disconnecting link of disconnecting link.The thyristor controlled series compensation is six pulsation bridge circuits, or 12 arteries and veins
Dynamic bridge circuit, or double 12 pulsation bridge circuits；The voltage source converter is two level converters, or diode clamp
Type three-level converter, or modularization multi-level converter MMC, or mixed multi-level transverter HMC or the level of tandem type two are changed
Flow device CTL.When two groups of thyristor converter device units being in series wherein one break down when, another can be online
Exit, or exit offline；After a thyristor converter device unit is out of service, the voltage source converter of inversion current conversion station is kept
Operational mode is constant, or enters buck operating mode.The switch element refers to isolation switch, or dc circuit breaker, or every
From the combination of both disconnecting link and dc circuit breaker.Smoothing reactor is mounted at the positive and negative two ends of voltage source converter；Institute
State the switch element (S1, S4) installed in the same position of positive and negative two-terminal DC transmission system circuit and both may be mounted at flat ripple reactance
Between device and transverter, it can also be arranged between DC power transmission line and smoothing reactor.
In the present embodiment 1, Hybrid HVDC topological structure as shown in Figure 3 includes：Rectification current conversion station and the inversion change of current
Stand, both are connected by two DC power transmission lines；Wherein：Rectification current conversion station is used for the three-phase alternating current of sending end AC network
Be converted to and inversion current conversion station is sent to by DC power transmission line after direct current；May be even on the bus that sending end AC network enters the station
It is connected to passive filter, it is also possible to do not have, need to be determined, be made up of in transverter thyristor converter device according to system engineering condition
When, installing passive filter is generally required, also needs to install reactive-load compensation capacitor sometimes.
Rectification current conversion station is composed in series by two groups of thyristor converter device units, its series connection node connection earthing pole, after series connection
Positive and negative two ends be connected by smoothing reactor with DC power transmission line；It is simultaneously in parallel between DC line and earthing pole
There is DC filter, with the topological structure shown in Fig. 1 except that two groups of thyristor converter device unit positions being in series in Fig. 3
In different current conversion stations, and this two current conversion station is located at two different AC network G1 and AC network G2.Wherein thyristor converter
The structure of device unit is as shown in fig. 7,1 be thyristor controlled series compensation in figure, and 3 be bypass cock, and 4 be series connection isolation switch, 5 for it is in parallel every
From disconnecting link.Thyristor converter device unit may be thyristor controlled series compensation, such as Fig. 7 (a)；Or for thyristor controlled series compensation and bypass cock simultaneously
Connection connection, such as Fig. 7 (b)；Or be thyristor controlled series compensation and bypass cock and disconnecting link component, thyristor controlled series compensation is in parallel with bypass cock
Connection, the one end of unit two ends respectively with connection disconnecting link after parallel connection is connected, and connects the other end parallel connection bypass disconnecting link of disconnecting link, such as
Fig. 7 (c), the bypass cock in parallel with thyristor controlled series compensation or bypass cock and disconnecting link component equivalent are Sy1, Sy2 in figure 3.
Thyristor controlled series compensation is using 12 pulsation bridge circuits；Wherein, each bridge arm is constituted by several Thyristors in series；
Thyristor converter device is using the strategy for determining dc power control.Thyristor converter device is respectively Y0/Y/ by a mode of connection
The three-winding transformer of Δ is connected with sending end AC network.Transformer can carry out electricity to the three-phase alternating current of sending end AC system
Grade transformation is pressed, to adapt to required DC voltage level, the transformer secondary mode of connection is not all that 12 pulsation bridge-types are brilliant
Two six pulse conversion bridges up and down of brake tube valve group provide the three-phase alternating current that phase angle difference is 30 °, in positive and negative polarities transformer one
Secondary side is then equiped with AC circuit breaker Sa and Sb respectively.
Inversion current conversion station is used to be converted in direct current be conveyed to after three-phase alternating current receiving end AC network G3, its equivalent resistance
Resist for Zs3；Inversion current conversion station is made up of a voltage source converter, and the same position of its positive and negative two ends DC line is filled respectively
There are switch element S1, a S4, while passing through switch element S2, a S3 respectively again in positive and negative two ends DC line same position
Parallel connection, which intersects, to be wired on the DC line of opposite end；Switch element S1, S4 both may be mounted between smoothing reactor and transverter,
It can also be arranged between DC line and smoothing reactor, and switch element S2, S3 also need to correspond to therewith.Voltage source converter
It is connected by a mode of connection for the two-winding transformer of Y0/ Δs with receiving end AC network S2, in positive and negative polarities transformer one
Secondary side is then equiped with AC circuit breaker Sc respectively, and voltage source converter, which is used, to be determined DC voltage and determine Reactive Power Control strategy control
System.
In forward direction conveying power work, rectification side thyristor converter device is by controlling the size at IGBT group angle to adjust
The size of whole dc power, while the gear by controlling converter power transformer so that Trigger Angle is changed in certain limit by rectification
Three-phase alternating current is changed into direct current by stream station；Simultaneous Switching element S1 and S4, which is in, closes position, and S1 and S4 may be isolation switch,
May also be dc circuit breaker, it is also possible to for the combination of dc circuit breaker and isolation switch.Direct current energy is in inverter side voltage source
Threephase AC electric energy is translated into the presence of transverter and receiving end AC system is injected, it can realize decoupled active and reactive control
System, the active power and reactive power of flexible control input to AC network.
In power transmission process, AC network G1 and AC network G2 two thyristor converter device lists are connected to
Member, if one of them breaks down, it can be closed at its by-pass switch element in parallel and realized by phase shift locking immediately
Exit online, without influenceing another thyristor converter device unit normally run, continue to power transmission.For example in Fig. 3 connect
The thyristor converter device for being connected to AC network G1 breaks down, and can close bypass cock Sy1 after protection act online, close simultaneously
Lock back goes out to be connected to AC network G1 thyristor converter device, and the thyristor converter device unit for being connected to AC network G2 can be with
Operation is continued to, accordingly, can be if the thyristor converter device for being connected to AC network G2 breaks down, after protection act
Line closes bypass cock Sy2, while the thyristor converter device for being connected to AC network G2 is exited in locking, and is connected to AC network
G1 thyristor converter device unit can continue to operation.Now the voltage source converter of Inverter Station remains on pattern not
Become, or enter buck operating mode, whole system can be continued to run with.
Embodiment 2：
As shown in figure 3, the first group of thyristor converter device unit and second group of thyristor converter device unit that are in series are distinguished
It is connected to AC network G1, AC network G2；When Inverter Station voltage source converter breaks down out of service, and AC network
G1 has excess power, while AC network G2 has power shortage, now can be by closing first switch element S1, closure the
Two switch element S2, disconnect the 3rd switch element S3, disconnect the 4th switch element S4 formation the first current path, power realize by
AC network G1 is transmitted to AC network G2；Now first group of thyristor converter device unit is rectification unit；Second group of IGCT
Inverter unit is inversion unit, and active power connects AC network G1 via described from first group of thyristor converter device unit
One group of thyristor converter device unit, first switch element S1, second switch element S2 and second group of thyristor converter device list
Member is transmitted to second group of connected AC network G2 of thyristor converter device unit；Can also by disconnecting first switch element S1,
Second switch element S2 is disconnected, the 3rd switch element S3 is closed, the 4th switch element S4 of closure forms the second current path, now
Active power connects AC network G1 via first group of thyristor converter device unit from first group of thyristor converter device unit,
3rd switch element S3, the 4th switch element S4 and second group of thyristor converter device unit are transmitted to second group of IGCT and changed
Flow the connected AC network G2 of device unit
On the contrary, if power need to be transmitted from AC network G2 to AC network G1, now first group of thyristor converter device
Unit is inversion unit, and second group of thyristor converter device unit is rectification unit；Active power via the first current path i.e. from
Second group of thyristor converter device unit connects AC network G2 via second group of thyristor converter device unit, first switch member
Part S1, second switch element S2 and first group of thyristor converter device unit are transmitted to first group of thyristor converter device list
Member connects AC network G1.Can also be via the second current path；Now active power is from second group of thyristor converter device
Unit connects AC network G2 via second group of thyristor converter device unit, the 3rd switch element S3, the 4th switch element
S4 and first group of thyristor converter device unit, which are transmitted to first group of thyristor converter device unit, connects AC network G1.
, can in the case where HVDC Transmission system one end current conversion station breaks down by using above topology structure
New DC transmission system is built to reuse transverter, realizes that active power can still be passed between two AC networks
It is defeated.In the case of shortage of power, the safety of whole power network can be improved.And the topological structure shown in Fig. 1 can not then build it is new
DC transmission system, so as to can not realize that power is supported.
Embodiment 3
This Hybrid HVDC system control method, comprises the following steps：
According to operation needs, first switch element S1, the switch element S3 of second switch element S2 the 3rd, the 4th switch are operated
Element (S4), forms first be made up of first group of thyristor converter device unit and second group of thyristor converter device unit
Transmission system, and formed by the voltage source converter and at least one set of thyristor converter device unit constituted it is second defeated
Electric system；
First group of thyristor converter device unit is connected to different AC networks from second group of thyristor converter device unit；It is described
First switch element S1 is closed to be closed with second switch element S2, and the 3rd switch element S3 disconnects to be disconnected with the 4th switch element S4
Form the first current path；Or first switch element S1 disconnects and disconnected with second switch element S2, the 3rd switch element S3 is closed
Close and close to form the second current path with the 4th switch element S4；
First group of thyristor converter device unit is rectification unit or inversion unit；
Second group of thyristor converter device unit is inversion unit or rectification unit；And
Active power connects AC network via first group of IGCT from first group of thyristor converter device unit
Inverter unit and second group of thyristor converter device unit, which are transmitted to second group of thyristor converter device unit, even to be handed over
Flow power network；Or active power connects AC network via described second group brilliant lock from second group of thyristor converter device unit
Pipe inverter unit and first group of thyristor converter device unit, which are transmitted to first group of thyristor converter device unit, to be connected
AC network.
Embodiment 4
This Hybrid HVDC system load flow inverts control method, comprises the following steps：
Step one：Reduce the dc power of straight-flow system；
Step 2：The DC current of straight-flow system is down to zero；
Step 3：First switch element S1, the 4th switch element S4 on positive and negative two ends DC line are disconnected, is closed at
Parallel connection intersects second switch element S2, the 3rd switch element S3 being wired on the DC line of opposite end, or disconnects in parallel intersect
Second switch element S2, the 3rd switch element S3 on the DC line of opposite end are wired to, positive and negative two ends DC line is closed at
On first switch element S1, the 4th switch member S4, the DC voltage polarity of reversion straight-flow system；
Step 4：Voltage source converter is rectification unit/inversion unit, and first group of inverter unit constitutes inversion list
Member/rectification unit；Or second group of inverter unit constitutes inversion unit/rectification unit；Or first group of inverter unit with
Second group of inverter unit collectively forms inversion unit/rectification unit.
Preferably, off voltage source type transverter is needed to connect transformer primary side before DC voltage polarity reversion
AC circuit breaker；Or be not required to off voltage source type transverter and connect transformer primary side AC circuit breaker.
The need for the development of power network or due to urgent Power Control, system need to be changed to reversely defeated by forward direction conveying power
The further preferred scheme of trend Umklapp process in power, the present embodiment is sent to comprise the following steps：
(1) automatic trend reversion enabling signal is obtained；
(2) dc power is reduced with given pace, until DC current minimizes electric current；
(3) when DC current minimizes electric current, stoppage in transit direct current；
(4) after direct current stoppage in transit, the AC circuit breaker Sc that voltage source converter connects transformer primary side is disconnected,
After AC circuit breaker Sc disconnects, switch element S1, the S4 on positive and negative two ends DC line are disconnected, in switch element S1, S4 breaks
After opening, wait 0~60 minute, closed a switch element S2, S3, and AC circuit breaker Sc is finally closed again；, DC voltage polarity is anti-
To and start direct current；
(5) after direct current startup, when dc power rises to setting performance number, power reverses process is completed.
In above-mentioned trend inversion scheme：Trend reverse function enabling signal refers to operate trend reverse function by operations staff
The startup triggered；Or as the startup caused by dispatcher's remote operation trend reverse function；Or by other control protection work(
The startup that can be triggered.
In above-mentioned trend inversion scheme：During trend is auto-reverse, trend automatic reverse rotation function can be terminated, tide
Stream automatic reverse rotation function, which is terminated rear straight-flow system, will keep the running status before end time constant.
In above-mentioned trend inversion scheme：During trend is auto-reverse, alternating current filter both can be according to the normal start and stop of direct current
Idle control logic switching, the running status of wave filter put into can also be kept constant, without switching operation, operation
Personnel can move back function pressing plate by throwing and adjust selection.
The technological thought of above example only to illustrate the invention, it is impossible to which protection scope of the present invention is limited with this, it is every
According to technological thought proposed by the present invention, any change done on the basis of technical scheme each falls within the scope of the present invention
Within.
Claims (6)
1. a kind of Hybrid HVDC system, including for connecting the sending end current conversion station of sending end AC network, for connecting receiving end
The receiving end current conversion station of AC network and the DC power transmission line for connecting sending end current conversion station and receiving end current conversion station；Its feature exists
In：The sending end current conversion station is rectification current conversion station, and receiving end current conversion station is inversion current conversion station；The rectification current conversion station is used for sending end
The three-phase alternating current of AC network to be converted to and send inversion current conversion station to by DC power transmission line after direct current；The inverse transformation
Stream station is used to be converted in direct current be conveyed to after three-phase alternating current receiving end AC network；The rectification current conversion station includes being in series
First group of thyristor converter device unit and second group of thyristor converter device unit；First group of thyristor converter device unit and second
The series connection node connection earthing pole of group thyristor converter device unit, or it is not connected to earthing pole；First group of thyristor converter device list
Member and second group of thyristor converter device unit connect same sending end AC network by transformer respectively, or connect respectively not
Same sending end AC network；
Inversion current conversion station connects receiving end AC network by transformer；Inversion current conversion station is by least one set of voltage source converter group
Into the positive and negative two ends of voltage source converter are respectively provided with first switch element (S1) and the 4th switch element（S4), while just
Negative two-terminal DC transmission system circuit passes through second switch element (S2) and the 3rd switch element respectively again（S3) intersection in parallel is wired to
On the DC power transmission line of opposite end；
When two groups of thyristor converter device units being in series wherein one break down when, this broken down is online
Exit, or exit offline；After a thyristor converter device unit is out of service, the voltage source converter of inversion current conversion station is kept
Operational mode is constant, or enters buck operating mode；
Smoothing reactor is mounted at the positive and negative two ends of voltage source converter；It is described to be arranged on positive and negative two-terminal DC transmission system line
The switch element (S1, S4) of the identical correspondence position on road is arranged between smoothing reactor and transverter, or installed in direct current
Between transmission line of electricity and smoothing reactor.
2. a kind of Hybrid HVDC system as claimed in claim 1, it is characterised in that：The thyristor converter device unit bag
Include thyristor controlled series compensation；Or be connected in parallel including thyristor controlled series compensation with bypass cock；Or opened including thyristor controlled series compensation with bypass
Close and disconnecting link component, thyristor controlled series compensation is connected in parallel with bypass cock, it is in parallel after unit two ends respectively with connect the one of disconnecting link
End is connected, and connects the other end parallel connection bypass disconnecting link of disconnecting link.
3. a kind of Hybrid HVDC system as claimed in claim 1 or 2, it is characterised in that：The thyristor controlled series compensation is six
Pulse bridge circuit, either 12 pulsation bridge circuits or it is double 12 pulsation bridge circuit；The voltage source converter is two
Level converter, or diode-clamped three-level converter, or modularization multi-level converter MMC, or mixed multi-level are changed
Flow the device HMC or level converter CTL of tandem type two.
4. a kind of Hybrid HVDC system as claimed in claim 1 or 2, it is characterised in that：The switch element refer to every
From the combination of disconnecting link, or dc circuit breaker, or isolation switch and both dc circuit breakers.
5. a kind of Hybrid HVDC system control of the Hybrid HVDC system any one of use claim 1-4
Method, it is characterised in that：
According to operation needs, operation first switch element (S1), second switch element（S2) the 3rd switch element (S3), the 4th
Switch element（S4), form what is be made up of first group of thyristor converter device unit and second group of thyristor converter device unit
First transmission system, and form the be made up of the voltage source converter and at least one set of thyristor converter device unit
Two transmission systems；
First group of thyristor converter device unit is connected to different AC networks from second group of thyristor converter device unit；Described first
Switch element (S1) is closed and second switch element（S2) close, the 3rd switch element (S3) disconnects and the 4th switch element
（S4) disconnect and form the first current path；Or first switch element (S1) disconnects and second switch element（S2) disconnect, the 3rd
Switch element (S3) is closed and the 4th switch element（S4) closure forms the second current path；
First group of thyristor converter device unit is rectification unit or inversion unit；
Second group of thyristor converter device unit is inversion unit or rectification unit；And
Active power connects AC network via first group of thyristor converter from first group of thyristor converter device unit
Device unit and second group of thyristor converter device unit, which are transmitted to second group of thyristor converter device unit, connects alternating current
Net；Or active power connects AC network from second group of thyristor converter device unit and changed via second group of IGCT
Stream device unit is transmitted to first group of thyristor converter device unit with first group of thyristor converter device unit even to be exchanged
Power network.
6. a kind of Hybrid HVDC system load flow of the Hybrid HVDC system any one of use claim 1-4
Invert control method, it is characterised in that：
Step one：Reduce the dc power of straight-flow system；
Step 2：The DC current of straight-flow system is down to zero；
Step 3：Disconnect the first switch element (S1) on positive and negative two ends DC line, the 4th switch element（S4), it is closed at
Parallel connection intersects the second switch element (S2) being wired on the DC line of opposite end, the 3rd switch element（S3), or disconnect in parallel
Intersect the second switch element (S2) being wired on the DC line of opposite end, the 3rd switch element（S3), it is closed at positive and negative two ends
First switch element (S1) on DC line, the 4th switch element（S4), the DC voltage polarity of straight-flow system is inverted；
Step 4：Voltage source converter is rectification unit/inversion unit, and first group of inverter unit constitutes inversion unit/whole
Flow unit；Or second group of inverter unit constitutes inversion unit/rectification unit；Or first group of inverter unit and second group
Inverter unit collectively forms inversion unit/rectification unit；
Off voltage source type transverter is needed to connect transformer primary side AC circuit breaker before DC voltage polarity reversion；Or not
Off voltage source type transverter is needed to connect transformer primary side AC circuit breaker.
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| CN103532163B (en) * | 2013-09-23 | 2015-09-16 | 武汉大学 | The Hybrid HVDC system topology switched based on polarity and starting method |
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| CN104578130B (en) * | 2015-01-08 | 2017-05-31 | 南京南瑞继保电气有限公司 | A kind of Hybrid HVDC transverter and direct current transportation device |
| CN104638665B (en) * | 2015-03-06 | 2017-10-17 | 南京南瑞继保电气有限公司 | A kind of Hybrid HVDC system load flow inverts control method and device |
| CN104753079B (en) * | 2015-03-27 | 2018-05-29 | 国家电网公司 | A kind of Hybrid HVDC system of achievable anti-power delivery |
| CN104795834B (en) * | 2015-04-29 | 2017-08-04 | 南京南瑞继保电气有限公司 | A kind of Hybrid HVDC topological structure and control method |
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