CN104795834A - Hybrid direct-current transmission topology structure and control method - Google Patents
Hybrid direct-current transmission topology structure and control method Download PDFInfo
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Abstract
The invention discloses a hybrid direct-current transmission topology structure and a control method. The hybrid direct-current transmission topology structure is characterized in that two groups of thyristor converters are connected in series to form a first converter station, two groups of voltage source type converters are connected in series to form a second converter station, switch elements are respectively mounted at the same positions of the positive ends and the negative ends of the converters, in series connection, of the first converter station or the second converter station or the first converter station and the second converter station, and meanwhile, the same positions of the positive ends and the negative ends of the converters are in parallel connection and crossly connected to the opposite ends through one switch element respectively. The control method includes reducing direct-current power of a direct-current system to zero, and changing states of the switch elements to invert voltage polarity of the direct-current system, thereby achieving overall operation of two poles after inversion of the direct-current voltage polarity or achieving new two-pole direct-current operation by means of crossing of the converters in series connection of the converter stations at both ends. The system of the hybrid direct-current transmission topology structure has advantages of low manufacturing cost as the conventional direct-current transmission and control flexibility as the flexible direct-current transmission, and the like.
Description
Technical field
The present invention relates to Hybrid HVDC field, particularly relate to a kind of Hybrid HVDC topological structure and control method.
Background technology
HVDC (High Voltage Direct Current) transmission system can be divided into two types: based on the Traditional DC transmission system (LCC-HVDC) of thyristor technology; Based on the flexible direct current power transmission system (Flexible-HVDC) of all-controlling power electronics device technology.Traditional DC transmission system (LCC-HVDC) cost is low, loss is little, running technology is ripe, at present, the DC transmission system overwhelming majority run in the world is all LCC-HVDC system, but Traditional DC transmission system (LCC-HVDC) exists the easy commutation failure of inverter side, strong to the dependence of AC system, absorb idle in a large number, the shortcomings such as current conversion station floor space is large.The flexible direct current power transmission system (Flexible-HVDC) of a new generation then has can realize active power and reactive power uneoupled control, can power to passive network, compact conformation floor space is little, there is not the advantages such as commutation failure fault, but also exist with high costs, cannot effectively process the defects such as DC side fault.Therefore the Hybrid HVDC in conjunction with Traditional DC transmission of electricity and flexible DC power transmission will have future in engineering applications.The Hybrid HVDC system one end that the present invention relates to is the LCC-HVDC based on thyristor technology, one end is the voltage source converter that all-controlling power electronics device is formed, the topological structure of current mixing two-terminal direct current transmission system mainly contains the mixing two-terminal direct current transmission system of the mixing two-terminal direct current transmission system of symmetrical monopolar wiring as shown in Figure 1 and the bipolar wiring of symmetry shown in Fig. 2, and the voltage source converter in Fig. 1 or Fig. 2 and the position of LCC-HVDC can exchange.This system combines that Traditional DC transmission losses is little, running technology is ripe and flexible DC power transmission can be powered to passive network, the advantage of commutation failure can not occur, but also there is the unalterable shortcoming of direction of tide.
Along with installed capacity in power grid in actual motion, the change of network load and rate for incorporation into the power network, frequently may carry out the reversion of direct current power direction of energy direction is changed to another electrical network by an electrical network.HVDC (High Voltage Direct Current) transmission system is all made up of two ends or multiterminal converter station and DC power transmission line, wherein alternating current is converted to galvanic converter and is called rectifier, and converter direct current being converted to alternating current is called inverter.Generally the change in direct current transportation transmission power direction is called that trend is reversed, also referred to as anti-power delivery.When there is trend reversion, the operating condition of the current conversion station at two ends can change, and namely original converting plant will become inverter operation, and Inverter Station originally then becomes rectification state.Because the converter of Traditional DC all adopts thyristor converter device, the sense of current can not change, polarity of voltage can only be changed during trend reversion, and direct current direction can only be changed during the reversion of voltage source converter trend, DC voltage polarity can not be changed, therefore the trend mixing two-terminal direct current transmission system generally can not change, generally need to install associated switching elements additional if need to change, change the polarity of voltage source converter, generally all install respective switch element additional to reach the object changing its polarity of voltage at each voltage source converter end at present, as shown in Figure 2, switch element S1 is installed additional at the positive and negative two ends of VSC converter 1, S2, S3, S4, install switch element S5 additional, S6, S7, S8 at the positive and negative two ends of VSC converter 2, like this system investments cost is just added for bipolar direct current transmission system.In addition, also have method to propose by the voltage source converter adopting topological structure comparatively complicated at present, realized the reversion of voltage source converter both end voltage polarity by relevant control strategy, so not only cost increases, and control complicated, reduce the reliability of system.
Summary of the invention
Object of the present invention: be to provide a kind of Hybrid HVDC topological structure and control method thereof, combine the advantage based on thyristor converter device and the direct current transportation topology based on voltage source converter, comparatively can be easy to the trend reversion realizing bipolar DC while reducing system switching element, the impact on interconnect AC electrical network in trend Umklapp process can be effectively reduced simultaneously.
In order to reach above-mentioned purpose, solution of the present invention is: a kind of Hybrid HVDC topological structure, is characterized in that:
First current conversion station is composed in series by two groups of thyristor converter devices, and its series connection node connects earth electrode or metal center line;
Second current conversion station is composed in series by two groups of voltage source converter, and its series connection node connects earth electrode or metal center line;
The same position at the positive and negative two ends in the first current conversion station or the second current conversion station or the first current conversion station and the second current conversion station after converter series connection is equipped with a switch element (S1 respectively, S4), simultaneously at positive and negative two ends same position again respectively by switch element (S2, a S3) improved cross connect in parallel to opposite end.
In such scheme: be equiped with smoothing reactor and DC filter in the first current conversion station.
In such scheme: the first current conversion station is connected with the second transmission line by the first transmission line with the second current conversion station, or by the first transmission line, the second transmission line and the 3rd metal center connection.
In such scheme: described thyristor converter device is six pulsation bridge circuits, or 12 pulsation bridge circuits, or two 12 pulsation bridge circuits; Described voltage source converter is two level converters, or three-level converter, or modularization multi-level converter MMC, or mixed multi-level converter HMC or tandem type two level converter CTL.
In such scheme: described switch element refers to the combination of isolation switch or DC circuit breaker or isolation switch and DC circuit breaker.
In such scheme: the positive and negative two ends after two groups of voltage source converter series connection are all provided with smoothing reactor, described switch element (the S1 being arranged on same position, positive and negative two ends, S4) be arranged between smoothing reactor and converter, or be arranged between DC power transmission line and smoothing reactor.
The present invention also provides a kind of control method of Hybrid HVDC topological structure in addition, it is characterized in that: comprise following steps:
Step one: the direct current power reducing the two poles of the earth DC transmission system;
Step 2: the direct current of the two poles of the earth DC transmission system is down to zero;
Step 3: wait for after t1 minute, disconnect the switch element (S1, S4) at positive and negative two ends, closed improved cross connect in parallel is to the switch element (S2, S3) of opposite end simultaneously, the DC voltage polarity of reversion the two poles of the earth DC transmission system; Or disconnect the switch element (S2, S3) of improved cross connect in parallel to opposite end, simultaneously the switch element (S1, S4) at closed positive and negative two ends, the DC voltage polarity of reversion the two poles of the earth DC transmission system, t1 span: 0 ~ 60;
Step 4: after the DC voltage polarity reversion of the two poles of the earth DC transmission system, the two poles of the earth form an overall operation, or the series connection converter of two ends current conversion station intersects to form new the two poles of the earth DC operation.
In such scheme: the series connection converter of described two ends current conversion station intersects to form new the two poles of the earth DC operation and refers to that the thyristor converter device connecting electrode line before DC voltage polarity reversion is connected negative line voltage source converter with before DC voltage polarity reverses forms new operation pole, the voltage source converter that the thyristor converter device of connection negative line is connected electrode line with before DC voltage polarity reverses before DC voltage polarity reverses forms new operation pole.
In such scheme: operating system DC voltage polarity reversion before need off voltage source type converter connect transformer primary side AC circuit breaker; Or do not need off voltage source type converter connect transformer primary side AC circuit breaker.
In such scheme: after trend reversion, the control model of two ends current conversion station changes; Or it is constant to maintain former control model.
Beneficial effect of the present invention:
1. topological structure of the present invention has the advantages such as traditional thyristors converter cost is low, loss is low, reliability is strong concurrently, and voltage source converter controls flexibly, active power and reactive power uneoupled control, to advantages such as AC system dependence are low; System is divided into positive and negative polarities to strengthen direct current system reliability of operation, and possesses that trend is counter send function.Be applicable to the occasions such as high-power, long distance high-voltage direct current transportation, isolated island power transmission.
2. adopt trend inverting method of the present invention can invest at minimizing switch element, do not increase equipment withstand voltage, comparatively be easy to the trend reversion realizing bipolar DC while through-current capability, the impact on interconnect AC electrical network in trend Umklapp process can be effectively reduced simultaneously.
Accompanying drawing explanation
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.
Fig. 3 is a kind of sending end of the present invention is thyristor converter device, and receiving end is the high-voltage bipolar direct current transportation structure chart that voltage source converter is formed, and wherein receiving end current conversion station is equipped with diverter switch element.
Fig. 4 is a kind of sending end of the present invention is voltage source converter, and receiving end is the high-voltage bipolar direct current transportation structure chart that thyristor converter device is formed, and wherein sending end current conversion station is equipped with diverter switch element.
Fig. 5 is a kind of sending end of the present invention is thyristor converter device, and receiving end is the high-voltage bipolar direct current transportation structure chart that voltage source converter is formed, and wherein two ends current conversion station is all equipped with diverter switch element.
Fig. 6 is a kind of sending end of the present invention is voltage source converter, and receiving end is the high-voltage bipolar direct current transportation structure chart that thyristor converter device is formed, and wherein two ends current conversion station is all equipped with diverter switch element.
Fig. 7 is trend Umklapp process schematic diagram in the present invention.
Embodiment
Below with reference to accompanying drawing, technical scheme of the present invention and beneficial effect are described in detail.
The invention provides a kind of Hybrid HVDC topological structure and trend reversion control method, be applicable to the Hybrid HVDC topological structure as shown in Fig. 3, Fig. 4, Fig. 5 and Fig. 6 simultaneously.Be described for topological structure shown in Fig. 3 below, Hybrid HVDC topological structure as shown in Figure 3 comprises: rectification current conversion station and inversion current conversion station, and both are connected by two DC power transmission line; Wherein: rectification current conversion station sends inversion current conversion station to by DC power transmission line after being used for that the three-phase alternating current of sending end AC network is converted to direct current; The bus that sending end AC network enters the station may be connected with passive filter, may not have, need determine according to system engineering condition, when converter is made up of thyristor converter device yet, generally need to install passive filter, sometimes also need to install reactive-load compensation capacitor.Rectification current conversion station is composed in series by two groups of thyristor converter devices, and its series connection node connects earth electrode, and the positive and negative two ends after series connection are all connected with DC power transmission line by smoothing reactor; Between DC line and the earth, be equiped with DC filter simultaneously.
Thyristor converter device adopts 12 pulsation bridge circuits; Wherein, each brachium pontis is formed by several Thyristors in series; Thyristor converter device adopts constant DC current control policy control.The three-winding transformer that thyristor converter device is respectively Y0/Y/ Δ by a mode of connection is connected with sending end AC network, and transformer primary side is equiped with AC circuit breaker Sa and Sb respectively.Transformer can carry out electric pressure conversion to the three-phase alternating current of sending end AC system, to adapt to required DC voltage level, two the six pulse conversion bridges not up and down being all 12 pulsation bridge-type thyristor converter devices of the transformer secondary mode of connection provide phase angle difference to be the three-phase alternating current of 30 °, to reduce the harmonic current flowing into electrical network.
Inversion current conversion station flows to receiving end AC network after being used for that direct current is converted to three-phase alternating current.Inversion current conversion station is composed in series by two groups of voltage source converter, its series connection node connects earth electrode, the same position of the positive and negative two ends DC line after series connection is equipped with a switch element S1 respectively, S4, simultaneously at positive and negative two ends DC line same position again respectively by switch element S2, S3 improved cross connect in parallel in the DC line of opposite end; Switch element S1, S4 both can be arranged between smoothing reactor and converter, also can be arranged between DC power transmission line and smoothing reactor, and switch element S2, S3 also need corresponding with it.The S1 of switch element shown in Fig. 3, S4 is arranged between DC power transmission line and smoothing reactor, between switch element S1 and smoothing reactor, be connected to switch element S4 near AC line trackside by switch element S2, between switch element S4 and smoothing reactor, be connected to switch element S1 near AC line trackside by switch element S3.The two winding transformer that voltage source converter is Y0/ Δ by a mode of connection is connected with receiving end AC network, be equiped with AC circuit breaker Sc and Sd respectively at transformer primary side, voltage source converter adopts to be determined direct voltage and determines Reactive Power Control policy control.
The present embodiment is when forward transmission power works, the rectification side thyristor converter device of positive electrode systems and negative pole system adjusts the size of DC side electric current by the size controlling IGBT group angle, simultaneously by controlling the gear of converter transformer, make Trigger Angle in certain limit, change three-phase alternating current into direct current by rectification current conversion station; Inverter side switch element S1 and S4 is in co-bit, direct current energy will be converted into threephase AC electric energy and inject receiving end AC system under the effect of the voltage source converter of the positive electrode systems of inverter side and negative pole system, it can realize the uneoupled control of active power and reactive power, and flexible control inputs is to the active power of AC network and reactive power.
Along with the development of electrical network or the needs that control due to urgent power, the AC network transmission power that the AC network transmission power that the AC network connected from thyristor converter device connects to voltage source converter will become the AC network that connected by voltage source converter and connects to thyristor converter device, trend reversion has following 2 kinds of situations:
Embodiment 1: whole trend Umklapp process as shown in schematic diagram 7,
Specifically comprise the steps:
(1) automatic trend reversion enabling signal is obtained;
(2) positive and negative polarities direct current power is reduced, until the two poles of the earth direct current is down to minimum current with given pace;
(3) after the two poles of the earth direct current is down to minimum current, send step-down order, the perunit value of voltage reference value is revised as k1 simultaneously, the span of k1 is 0 ~ 1;
(4) when the two poles of the earth direct voltage is down to voltage reference value, a pole direct current is down to zero stoppage in transit;
(5) after a pole direct current is stopped transport, wait for 0 ~ 60 minute, another pole direct current is down to zero stoppage in transit;
(6) after the two poles of the earth direct current is all stopped transport, by voltage source converter connect the AC circuit breaker Sc of transformer primary side, Sd disconnects, after AC circuit breaker Sc, Sd disconnect, disconnect the switch element S1 in the DC line of positive and negative two ends, S4, at switch element S1, after S4 all disconnects, wait for 0 ~ 60 minute, close a switch element S2, S3, finally close AC circuit breaker Sc, Sd again; The thyristor converter device now originally connecting electrode line forms new operation pole with the voltage source converter being originally connected negative line, the thyristor converter device of originally connection negative line forms new operation pole with the voltage source converter being originally connected electrode line, and two operation pole tension poles reversal newly formed also start one of them operation pole;
(7) after a pole direct current starts, wait for 0 ~ 60 minute, another pole direct current starts;
(8) after the two poles of the earth direct current all starts, wait for 0 ~ 60 minute, send total head action command or the perunit value of voltage reference value is revised as k2, the span of k2 is 0 ~ 1, and k2 > k1;
(9) rise to total head or voltage reference value at the two poles of the earth direct voltage, when the two poles of the earth direct current power rises to setting power value, trend Umklapp process completes.
Embodiment 2: when negative DC is stopped transport, relevant device in the current conversion station of maintenance voltage source converter place, when only positive DC runs, its trend Umklapp process is as follows:
(1) automatic trend reversion enabling signal is obtained;
(2) positive DC power is reduced, until positive DC electric current is down to minimum current with given pace;
(3) after positive DC electric current is down to minimum current, send step-down order, the perunit value of voltage reference value is revised as k3 simultaneously, the span of k3 is 0 ~ 1;
(4) when positive DC voltage is down to voltage reference value, stoppage in transit positive DC;
(5) after positive DC is stopped transport, by voltage source converter connect transformer primary side AC circuit breaker Sc disconnect, after AC circuit breaker Sc disconnects, disconnect the switch element S1 in the DC line of positive and negative two ends, S4, at switch element S1, after S4 all disconnects, wait for 0 ~ 60 minute, close a switch element S2, and finally close AC circuit breaker Sc again; The thyristor converter device now originally connecting negative line forms new operation pole with the voltage source converter being originally connected electrode line, and the operation pole tension pole reversal newly formed also starts direct current;
(6) after direct current starts, wait for 0 ~ 60 minute, send total head action command or the perunit value of voltage reference value is revised as k4, the span of k4 is 0 ~ 1, and k4 > k3;
(7) rise to total head or voltage reference value at direct voltage, when direct current power rises to setting power value, power reverses process completes.
Embodiment 3: the AC network connected from voltage source converter need become the AC network transmission power that the AC network that connected by thyristor converter device connects to voltage source converter to the AC network transmission power that thyristor converter device connects, whole trend Umklapp process specifically comprises the steps:
(1) automatic trend reversion enabling signal is obtained;
(2) positive and negative polarities direct current power is reduced, until the two poles of the earth direct current is down to minimum current with given pace;
(3) after the two poles of the earth direct current is down to minimum current, a pole direct current is down to zero stoppage in transit;
(4) after a pole direct current is stopped transport, wait for 0 ~ 60 minute, another pole direct current is down to zero stoppage in transit;
(5) after the two poles of the earth direct current is all stopped transport, by voltage source converter connect the AC circuit breaker Sc of transformer primary side, Sd disconnects, after AC circuit breaker Sc, Sd disconnect, cut-off switch element S2, S3, at switch element S2, after S3 all disconnects, wait for 0 ~ 60 minute, the switch element S1 closed in the DC line of positive and negative two ends, S4, finally close AC circuit breaker Sc, Sd again; The thyristor converter device now originally connecting electrode line forms new operation pole with the voltage source converter being originally connected negative line, the thyristor converter device of originally connection negative line forms new operation pole with the voltage source converter being originally connected electrode line, and two operation pole tension poles reversal newly formed also start one of them operation pole;
(6) after a pole direct current starts, wait for 0 ~ 60 minute, another pole direct current starts;
(7) after the two poles of the earth direct current all starts, the two poles of the earth direct current power rises to setting power value with given pace, and trend Umklapp process completes.
In above-mentioned trend inversion scheme: trend reverse function enabling signal refers to and operates by operations staff the startup that trend reverse function triggers; Or the startup caused by dispatcher's remote operation trend reverse function; Or by other Control protection functions trigger startup.
In above-mentioned trend inversion scheme: in the auto-reverse process of trend, trend automatic reverse rotation function can be terminated, trend automatic reverse rotation function is terminated rear direct current system by constant for the power level kept before end time.
In above-mentioned trend inversion scheme: after trend reversion, the control model of two ends current conversion station changes; Or it is constant to maintain former control model.
In above-mentioned trend inversion scheme: in the auto-reverse process of trend, alternating current filter both can according to the idle control logic switching of the normal start and stop of direct current, also the running status of the filter dropped into can be kept constant, do not carry out switching operation, operations staff moves back function pressing plate to adjust selection by throwing.
Above embodiment is only and technological thought of the present invention is described, can not limit protection scope of the present invention with this, and every technological thought proposed according to the present invention, any change that technical scheme basis is done, all falls within scope.
Claims (10)
1. a Hybrid HVDC topological structure, is characterized in that:
First current conversion station is composed in series by two groups of thyristor converter devices, and its series connection node connects earth electrode or metal center line;
Second current conversion station is composed in series by two groups of voltage source converter, and its series connection node connects earth electrode or metal center line;
The same position at the positive and negative two ends in the first current conversion station or the second current conversion station or the first current conversion station and the second current conversion station after converter series connection is equipped with a switch element (S1 respectively, S4), simultaneously at positive and negative two ends same position again respectively by switch element (S2, a S3) improved cross connect in parallel to opposite end.
2. a kind of Hybrid HVDC topological structure as claimed in claim 1, is characterized in that: be equiped with smoothing reactor and DC filter in the first current conversion station.
3. a kind of Hybrid HVDC topological structure as claimed in claim 1, it is characterized in that: the first current conversion station is connected with the second transmission line by the first transmission line with the second current conversion station, or by the first transmission line, the second transmission line and the 3rd metal center connection.
4. a kind of Hybrid HVDC topological structure as claimed in claim 1, is characterized in that: described thyristor converter device is six pulsation bridge circuits, or 12 pulsation bridge circuits, or two 12 pulsation bridge circuits; Described voltage source converter is two level converters, or three-level converter, or modularization multi-level converter MMC, or mixed multi-level converter HMC or tandem type two level converter CTL.
5. a kind of Hybrid HVDC topological structure as claimed in claim 1, is characterized in that: described switch element refers to the combination of isolation switch or DC circuit breaker or isolation switch and DC circuit breaker.
6. a kind of Hybrid HVDC topological structure as claimed in claim 1, it is characterized in that: the positive and negative two ends after two groups of voltage source converter series connection are all provided with smoothing reactor, described switch element (the S1 being arranged on same position, positive and negative two ends, S4) be arranged between smoothing reactor and converter, or be arranged between DC power transmission line and smoothing reactor.
7. a control method for Hybrid HVDC topological structure, is characterized in that: comprise following steps:
Step one: the direct current power reducing the two poles of the earth DC transmission system;
Step 2: the direct current of the two poles of the earth DC transmission system is down to zero;
Step 3: wait for after t1 minute, disconnect the switch element (S1, S4) at positive and negative two ends, closed improved cross connect in parallel is to the switch element (S2, S3) of opposite end simultaneously, the DC voltage polarity of reversion the two poles of the earth DC transmission system; Or disconnect the switch element (S2, S3) of improved cross connect in parallel to opposite end, simultaneously the switch element (S1, S4) at closed positive and negative two ends, the DC voltage polarity of reversion the two poles of the earth DC transmission system, t1 span: 0 ~ 60;
Step 4: after the DC voltage polarity reversion of the two poles of the earth DC transmission system, the two poles of the earth form an overall operation, or the series connection converter of two ends current conversion station intersects to form new the two poles of the earth DC operation.
8. control method as claimed in claim 7, it is characterized in that: the series connection converter of described two ends current conversion station intersects to form new the two poles of the earth DC operation and refers to that the thyristor converter device connecting electrode line before DC voltage polarity reversion is connected negative line voltage source converter with before DC voltage polarity reverses forms new operation pole, the voltage source converter that the thyristor converter device of connection negative line is connected electrode line with before DC voltage polarity reverses before DC voltage polarity reverses forms new operation pole.
9. control method as claimed in claim 7, is characterized in that: need before the reversion of operating system DC voltage polarity off voltage source type converter connect transformer primary side AC circuit breaker; Or do not need off voltage source type converter connect transformer primary side AC circuit breaker.
10. control method as claimed in claim 7, is characterized in that: after trend reversion, the control model of two ends current conversion station changes; Or it is constant to maintain former control model.
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| CN105514957A (en) * | 2016-01-28 | 2016-04-20 | 南京南瑞继保电气有限公司 | Hybrid back-to-back direct current transmission system and current reversal control method |
| CN105762824A (en) * | 2016-03-10 | 2016-07-13 | 南京南瑞继保电气有限公司 | Hybrid direct current power transmission system control method and device |
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