CN203071587U - Multi-end flexible direct current transmission system - Google Patents
Multi-end flexible direct current transmission system Download PDFInfo
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- CN203071587U CN203071587U CN2012207441054U CN201220744105U CN203071587U CN 203071587 U CN203071587 U CN 203071587U CN 2012207441054 U CN2012207441054 U CN 2012207441054U CN 201220744105 U CN201220744105 U CN 201220744105U CN 203071587 U CN203071587 U CN 203071587U
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Abstract
The utility model relates to a multi-end flexible direct current transmission system which comprises two sending end converter stations and a receiving end converter station. A wind power plant is connected with the two sending end converter stations. The two sending end converter stations convert electric energy into direct current and transmit the direct current to the receiving end converter station though a direct current transmission line. The receiving end converter station converts the direct current into alternating current and is connected with a large power network. A first sending end converter station in the two sending end converter stations is connected with a second sending end converter station and the receiving end converter station through a direct current disconnecting switch (Sdc1). The second sending end converter station is connected with the first sending end converter station and the receiving end converter station through a direct current disconnecting switch (Sdc2). The receiving end converter station is connected with the first sending end converter station and the second sending end converter station through a direct current disconnecting switch (Sdc3). The starting procedure of the multi-end flexible direct current transmission system is stable and has a safe and reliable property and a wide range of application. The multi-end flexible direct current transmission system is used for multi-end flexible direct current transmission projects with modularization multi-end flat topological structures, and can decrease impact current on alternating current side or direct current side at the moment of deblocking of multi-end converter stations, and can stably generate direct voltage to a rated value.
Description
Technical field
The utility model is a kind of Multi-end flexible direct current transmission system, belongs to the innovative technology of Multi-end flexible direct current transmission system.
Background technology
Flexible DC power transmission is based on voltage source converter（VSC）And pulse width modulating technology（PWM）It is amplitude and phase all controllable alternating voltages by DC voltage inversion, and independently can quickly control transmitted active power and reactive power, significantly enhance the flexibility of transmission of electricity, as regional power grid interconnection is realized, the power transmission mode being most potential being coupled is stablized between Large Scale Wind Farm Integration and exchange light current net and major network.From ABB AB 1997 year, first experimental HVDC Light engineering puts into operation in Hellsjon, has had more than ten HVDC Light circuits to put into operation in the world so far.
At home, 863 key special subjects problems " research and development of Large Scale Wind Farm Integration flexible DC power transmission access technology " and its Nan ' ao Island demonstration project that Southern Power Grid Company undertakes, i.e. planning builds up a voltage class for ± 160kV, transmission capacity is 200MW 4 end flexible direct current power transmission systems, serves blue or green Australia, ox head ridge, cloud Australia and tower small island wind power plant.After project is built up, main function is to realize wind power plant coupling by flexible direct current power transmission system and Nan'ao power network and Shantou major network, and electric field is sent out safely, Nan ' ao Island power supply safety is ensured, and reduce influence of the fluctuation of wind power to local weak power network.
Multi-end flexible direct current transmission system（MMC-MTDC）Startup control, be premise and important foundation that system is normally run.MMC-MTDC system starting process, which includes closing a floodgate to rated direct voltage from AC power network, sets up a series of dynamic process.Current research both domestic and external, the control strategy that research emphasis is generally placed on during to VSC-HVDC steady-state operations is studied, and DC voltage now has reached rated value, and rarely has detailed analysis to start-up course.However, the start-up course such as controls improper, serious overvoltage and excessively stream will be produced in MMC converter valves AC and DC side, system oscillation will be even resulted in, influence AC system is normally run, and jeopardizes equipment and personal safety.
The content of the invention
The purpose of this utility model is to consider above mentioned problem and provide a kind of Multi-end flexible direct current transmission system reasonable in design, convenient and practical.The utility model is applied to the Multi-end flexible direct current transmission engineering using modular multilevel topological structure, can realize the moment unlocked in multiterminal current conversion station, reduces the dash current of alternating current-direct current side, and DC voltage is steadily set up and arrives rated voltage.The utility model start-up course is steady, and security reliability is high, applied widely.
The technical solution of the utility model is：Multi-end flexible direct current transmission system of the present utility model, include the first sending end current conversion station, second sending end current conversion station, receiving end current conversion station, wind power plant accesses the first sending end current conversion station and the second sending end current conversion station, first sending end current conversion station and the second sending end current conversion station, which is converted electric energy to, be transferred to receiving end current conversion station by DC line after direct current, receiving end current conversion station accesses bulk power grid again after being reverse into exchange, and first sending end current conversion station be connected by direct-current isolating switch Sdc1 with the second sending end current conversion station and receiving end current conversion station, second sending end current conversion station is connected by direct-current isolating switch Sdc2 with the first sending end current conversion station and receiving end current conversion station, receiving end current conversion station is connected by direct-current isolating switch Sdc3 with the first sending end current conversion station and the second sending end current conversion station.
Above-mentioned first sending end current conversion station is also associated with alternating current bypass switch Sb1, and the second sending end current conversion station is also associated with alternating current bypass switch Sb2, and receiving end current conversion station is also associated with alternating current bypass switch Sb3.
It is provided with above-mentioned alternating current bypass switch Sb1 in sending end current-limiting resistance Rx1, alternating current bypass switch Sb2 and is provided with sending end current-limiting resistance Rx2, receiving end current-limiting resistance Rx3 is provided with alternating current bypass switch Sb3.
Above-mentioned first sending end current conversion station is also associated with AC circuit breaker Sac1, and the second sending end current conversion station is also associated with AC circuit breaker Sac2, and receiving end current conversion station is also associated with AC circuit breaker Sac3.
Transverter used by above-mentioned first sending end current conversion station, the second sending end current conversion station and receiving end current conversion station is MMC transverters.
Each bridge arm of above-mentioned MMC transverters byNIndividual power model SM cascades are constituted, a reactor of being connected respectively between upper and lower bridge armLS, a facies unit is constituted with two bridge arms above and below phase.
Above-mentioned power model SM includes power tubeS 1WithS 2, diodeD 1WithD 2, resistanceR 1WithR 2, power model electric capacityC 0, quick by-pass switchK 1, IGCTK 2, whereinD 1WithD 2For corresponding anti-paralleled diode, power tubeS 1WithS 2With power model electric capacity after series connectionC 0Parallel connection, quick by-pass switchK 1And IGCTK 2With power tubeS 2It is in parallel.
The utility model is due to using in start-up course first using self-excitation charging modes, then by starting the adjustment of control strategy, the moment unlocked in multiterminal current conversion station is realized, reduces the dash current of alternating current-direct current side, DC voltage steadily sets up the whole process to rated voltage.The utility model makes the DC voltage of multiterminal flexible direct current system be climbed to rated voltage by control mode and ancillary method, but excessive rush of current and voltage overshoot is not produced again in alternating current-direct current side, start-up course is steady, and security reliability is high, applied widely.The utility model Multi-end flexible direct current transmission system starts method and had the following advantages that：
1) the utility model electrically combines the control strategy of converter deblocking process using AC by current-limiting resistance preliminary filling, is greatly reduced alternating current-direct current side impact electric current；
2) the utility model is applied to include the topology of the various Multi-end flexible direct current transmission systems of the soft lineal system in two ends, and especially with the topological structure of multi-point DC voltage control, each current conversion station can realize smooth starting by such a Starting mode.
3) the DC voltage control value of the utility model converter deblocking moment is relatively low, it is to avoid depress the voltage and rush of current of unblock MMC transverters in rated DC current.
4) the utility model need not configure extra current-limiting circuit in DC side.
A kind of convenient and practical Multi-end flexible direct current transmission system of the utility model.
Brief description of the drawings
Fig. 1 is the schematic diagram of Multi-end flexible direct current transmission system.
Fig. 2 is the soft straight system starting process receiving end current conversion station AC voltage real-time simulation schematic diagram in three ends.
Fig. 3 is the soft straight system starting process receiving end current conversion station ac-side current real-time simulation schematic diagram in three ends.
Fig. 4 is the soft straight system starting process receiving end current conversion station DC voltage real-time simulation schematic diagram in three ends.
Fig. 5 is the soft straight system starting process receiving end current conversion station DC side electric current real-time simulation schematic diagram in three ends.
Embodiment
Embodiment：
Structural representation of the present utility model is as shown in Figure 1, Multi-end flexible direct current transmission system of the present utility model, include the first sending end current conversion station 1, second sending end current conversion station 2, receiving end current conversion station 3, wind power plant accesses the first sending end current conversion station 1 and the second sending end current conversion station 2, first sending end current conversion station 1 and the second sending end current conversion station 2, which is converted electric energy to, be transferred to receiving end current conversion station 3 by DC line after direct current, receiving end current conversion station 3 accesses bulk power grid again after being reverse into exchange, and first sending end current conversion station 1 be connected by direct-current isolating switch Sdc1 with the second sending end current conversion station 2 and receiving end current conversion station 3, second sending end current conversion station 2 is connected by direct-current isolating switch Sdc2 with the first sending end current conversion station 1 and receiving end current conversion station 3, receiving end current conversion station 3 is connected by direct-current isolating switch Sdc3 with the first sending end current conversion station 1 and the second sending end current conversion station 2.
In the present embodiment, above-mentioned first sending end current conversion station 1 is also associated with alternating current bypass switch Sb1, and the second sending end current conversion station 2 is also associated with alternating current bypass switch Sb2, and receiving end current conversion station 3 is also associated with alternating current bypass switch Sb3.It is provided with above-mentioned alternating current bypass switch Sb1 in sending end current-limiting resistance Rx1, alternating current bypass switch Sb2 and is provided with sending end current-limiting resistance Rx2, receiving end current-limiting resistance Rx3 is provided with alternating current bypass switch Sb3.
Above-mentioned first sending end current conversion station 1 is also associated with AC circuit breaker Sac1, and the second sending end current conversion station 2 is also associated with AC circuit breaker Sac2, and receiving end current conversion station 3 is also associated with AC circuit breaker Sac3.
In the present embodiment, the transverter used by above-mentioned first sending end current conversion station 1, the second sending end current conversion station 2 and receiving end current conversion station 3 is MMC transverters.
In the present embodiment, each bridge arms of above-mentioned MMC transverters byNIndividual power model SM cascades are constituted, a reactor of being connected respectively between upper and lower bridge armLS, a facies unit is constituted with two bridge arms above and below phase.
In the present embodiment, above-mentioned power model SM includes power tubeS 1WithS 2, diodeD 1WithD 2, resistanceR 1WithR 2, power model electric capacityC 0, quick by-pass switchK 1, IGCTK 2, whereinD 1WithD 2For corresponding anti-paralleled diode, power tubeS 1WithS 2With power model electric capacity after series connectionC 0Parallel connection, quick by-pass switchK 1And IGCTK 2With power tubeS 2It is in parallel.
As shown in figure 1, each bridge arm of MMC transverters byNIndividual power model SM cascades are constituted.Connected respectively between upper and lower bridge arm a reactorLS, a facies unit is constituted with two bridge arms above and below phase.D 1WithD 2For corresponding anti-paralleled diode.Power model electric capacityC 0VoltageVc.Quick by-pass switchK 1For cutting off failure submodule, IGCTK 2For protection IGCT.If power model DC capacitor voltage has been controlled toVEach convertor unit of c, MMC transverter can export 0 HeVTwo kinds of voltages of c, then the state of bridge arm output voltage will 0,Vc,2Vc,..NVChange between c, i.e., with N+1 level state.
It is main to include precharge and converter deblocking start-up course in Multi-end flexible direct current transmission system start-up course.Precharge typically point separate excitation and self-excitation two ways.Self-excitation refers to from the capacitor charging for the AC system power model into MMC transverters that is connected with transverter；Separate excitation is to provide charge power by accessory power supply.The utility model is applied to the engineering using self-excitation charging modes.
In pre-charge process, MMC converter power module voltages are zero, power tubeS 1WithS 2State is off, MMC transverters are not unlocked.Each station AC system passes through power model power tube in each MMC transvertersS 1WithS 2On anti-paralleled diode to its electric capacity charge.
For MMC topologys, it is the rated voltage for being unable to reach electric capacity that only electric capacity, which is charged, by fly-wheel diode from AC by alternating voltage.As shown in Fig. 1, Vsa, Vsb, Vsc are respectively the phase voltage of a, b, c phase, such as Vsa ＞ Vsb, the anti-paralleled diode D1 of each power model of bridge arm charges to each power model electric capacity of bridge arm in b phases in anti-paralleled diode D2, b phase that charging current passes through each power model of bridge arm in a phases, while the anti-paralleled diode D2 of each power model of bridge arm charges to each power model electric capacity of bridge arm under a phases under anti-paralleled diode D1, b phase for passing through each power model of bridge arm under a phases;As Vsa ＜ Vsb, the anti-paralleled diode D2 of each power model of bridge arm charges to each power model electric capacity of bridge arm in a phases in anti-paralleled diode D1, b phase that charging current passes through each power model of bridge arm in a phases, while the anti-paralleled diode D1 of each power model of bridge arm charges to each power model electric capacity of bridge arm under b phases under anti-paralleled diode D2, b phase for passing through each power model of bridge arm under a phases.Remaining situation is similar.
The detailed process analysis of the utility model Starting mode, mainly includes the three below stage：
First stage, before pre-charge process starts, DC line has closed a floodgate, each current conversion station locking, sending end current conversion station 1 and the AC of sending end current conversion station 2 disconnect, the AC system of receiving end current conversion station 3 charges to the electric capacity of the station transverter, suppresses the overshoot current of AC combined floodgate moment by sending end current-limiting resistance Rx1, Rx2 with by-pass switch.
The bridge arm charged state of the MMC transverters of receiving end current conversion station is the zero state response in series connection RLC loops, gives the power model electric capacity of two bridge arms to be charged with parallel way in the same time equivalent to AC.Generally charged in overdamp mode, each power model electric capacityC 0Voltage it is equal, have
Order
Wherein
,
For the time
Wherein,
For single power model electric capacityC 0Magnitude of voltage,
For AC line voltage peak value,
For sending end current-limiting resistance Rx1, Rx2 and receiving end current-limiting resistance Rx3 resistance value,For bridge arm reactorLS reactance value,For power model electric capacityC 0Capacitance, N be single bridge arm power model electric capacity sum.
After the precharge of receiving end current conversion station is basically completed, receiving end current-limiting resistance Rx3 is cut off, then three bridge arm voltage final values are the station AC line voltage peak value above and below final receiving end current conversion station, the station power model capacitance voltage final value。
For sending end current conversion station 1 and sending end current conversion station 2, because DC side circuit closes a floodgate, directly charged equivalent to the anti-paralleled diode D2 and sending end current conversion station 1 of the power model by current conversion station 1 or the anti-paralleled diode D1 of sending end current conversion station 2 to the power model electric capacity at correspondence station, whole facies unit end-voltage value is the AC line voltage peak value of current conversion station 1.So, sending end current conversion station 1 and the power model capacitance voltage final value of sending end current conversion station 2, its voltage is only equivalent to the half of receiving end current conversion station capacitance voltage.
Now, sending end current conversion station 1 and the AC of sending end current conversion station 1 close a floodgate, and equally start to use capacitance voltage value in AC charging modes, its converter power module to rise, and after the completion of precharge, each station power model capacitance voltage value is equal.
Second stage, receiving end current conversion station starts unblock.This process receiving end current conversion station uses DC voltage control mode, DC voltage control definite value, the main rush of current for considering reduction alternating current-direct current side to greatest extent, it is desirable to which the capacitance voltage of single power model is in releasing process, and DC voltage value changes are smaller.
It is known for MMC transverters, valve side ac phase voltage is represented by
Wherein,
For modulation degree,
For DC voltage value.
In MMC converter deblockings, it is assumed that bridge arm input power model is P in certain moment a phases, bridge arm input power model is Q under A phases, and n+1 level, i.e. P+Q=n is presented in exchange output phase voltage.Power model capacitance voltage value is, now have
Therefore, for precharge complete when capacitance voltage and MMC converter deblockings when capacitance voltage, have following relation
If do not considered converter bridge arm redundant power module, the moment of the MMC converter deblockings of current conversion station 1, if given DC voltage control value is n power model capacitance voltage value sum, zero dash current of unblock moment can be realized in theory.
After receiving end current conversion station DC voltage is set up, the transverter of sending end current conversion station 1 and sending end current conversion station 2 can be successively unlocked.
Phase III, after three stations are unlocked, the DC voltage controller with slop control is used in receiving end current conversion station 1, DC voltage is progressively risen to rated value, so far complete the whole start-up course of the soft straight transmission system of multiterminal.The start-up course real-time simulation is as shown in Figure 2-5.
Fig. 1 is two to send a three-terminal flexible direct-current power transmission system received, and the maintaining whole DC network voltage stabilization and power-balance of the task is undertaken by electricity from DC network by end station.The current conversion station that two sending end current conversion stations are accessed as wind power plant, to DC network injecting power.
Corresponding to the three-terminal flexible direct-current power transmission system shown in Fig. 1, whole system start-up course is as follows：
The startup method of the utility model Multi-end flexible direct current transmission system, comprises the following steps：
1）All switches are off in system, the first sending end current conversion station 1, the second sending end current conversion station 2, the equal locking of receiving end current conversion station 3；
2）Start to start, close direct-current isolating switch Sdc1, Sdc2 and Sdc3；
3）The AC circuit breaker Sac3 of receiving end current conversion station 3 is closed, the power model electric capacity of the first sending end current conversion station 1, the second sending end current conversion station 2 and receiving end current conversion station 3 is given from the AC of receiving end current conversion station 3C 0Charging；
4）The bridge arm voltage of receiving end current conversion station 3 reaches the AC line voltage peak value of receiving end current conversion station 3, when the bridge arm voltage of first sending end current conversion station 1 and the second sending end current conversion station 2 reaches the 1/2 of the AC line voltage peak value of receiving end current conversion station 3, the alternating current bypass for closing receiving end current conversion station 3 switchs Sb3, and receiving end current-limiting resistance Rx3 is exited；
5）AC circuit breaker Sac1, Sac2 of the first sending end current conversion station 1 and the second sending end current conversion station 2 are closed respectively, continue the power model electric capacity to the first sending end current conversion station 1 and the second sending end current conversion station 2C 0Charging, when the bridge arm voltage of the first sending end current conversion station 1 and the second sending end current conversion station 2 equally reaches correspondence AC line voltage peak value, closes by-pass switch Sb1, Sb2, and sending end current-limiting resistance Rx1, Rx2 of the first sending end current conversion station 1 and the second sending end current conversion station 2 are exited；Direct-current isolating switch Sdc3；
6）Receiving end current conversion station 3 is unlocked using DC voltage control mode, sets DC voltage control initial value, as magnitude of voltage after uncontrollable rectifier；
7）It is 0 that first sending end current conversion station 1, the second sending end current conversion station 2, which set active, idle class reference value, unblock；
8）The DC voltage control of receiving end current conversion station 3 enables slop control, DC voltage control initial value is never controlled rectified voltage value and slowly rises to rated value；
9）System start completion.
Above-mentioned steps 6）Middle DC voltage control initial value is 0.735pu.
Starting mode of the present utility model, in corresponding rush of current and DC side rush of current caused by AC of standing when the formulation of DC voltage initial value mainly considers to reduce to greatest extent different station unblocks, the definite value can be according to engineering actual modification, and each station alternating current need to be controlled to impact no more than rated value.
Claims (7)
1. a kind of Multi-end flexible direct current transmission system, it is characterised in that include the first sending end current conversion station（1）, the second sending end current conversion station（2）, receiving end current conversion station（3）, wind power plant the first sending end current conversion station of access（1）And the second sending end current conversion station（2）, the first sending end current conversion station（1）And the second sending end current conversion station（2）Convert electric energy to and receiving end current conversion station is transferred to by DC line after direct current（3）, receiving end current conversion station（3）Bulk power grid, and the first sending end current conversion station are accessed again after being reverse into exchange（1）Pass through direct-current isolating switch Sdc1 and the second sending end current conversion station（2）And receiving end current conversion station（3）Connection, the second sending end current conversion station（2）Pass through direct-current isolating switch Sdc2 and the first sending end current conversion station（1）And receiving end current conversion station（3）Connection, receiving end current conversion station（3）Pass through direct-current isolating switch Sdc3 and the first sending end current conversion station（1）And the second sending end current conversion station（2）Connection.
2. Multi-end flexible direct current transmission system according to claim 1, it is characterised in that above-mentioned first sending end current conversion station（1）It is also associated with alternating current bypass switch Sb1, the second sending end current conversion station（2）It is also associated with alternating current bypass switch Sb2, receiving end current conversion station（3）It is also associated with alternating current bypass switch Sb3.
3. Multi-end flexible direct current transmission system according to claim 2, it is characterized in that being provided with sending end current-limiting resistance Rx1 in above-mentioned alternating current bypass switch Sb1, it is provided with alternating current bypass switch Sb2 in sending end current-limiting resistance Rx2, alternating current bypass switch Sb3 and is provided with receiving end current-limiting resistance Rx3.
4. Multi-end flexible direct current transmission system according to claim 2, it is characterised in that above-mentioned first sending end current conversion station（1）It is also associated with AC circuit breaker Sac1, the second sending end current conversion station（2）It is also associated with AC circuit breaker Sac2, receiving end current conversion station（3）It is also associated with AC circuit breaker Sac3.
5. the Multi-end flexible direct current transmission system according to any one of Claims 1-4, it is characterised in that above-mentioned first sending end current conversion station（1）, the second sending end current conversion station（2）And receiving end current conversion station（3）Transverter used is MMC transverters.
6. Multi-end flexible direct current transmission system according to claim 5, it is characterised in that each bridge arm of above-mentioned MMC transverters byNIndividual power model SM cascades are constituted, a reactor of being connected respectively between upper and lower bridge armLS, a facies unit is constituted with two bridge arms above and below phase.
7. Multi-end flexible direct current transmission system according to claim 6, it is characterised in that above-mentioned power model SM includes power tubeS 1WithS 2, diodeD 1WithD 2, resistanceR 1WithR 2, power model electric capacityC 0, quick by-pass switchK 1, IGCTK 2, whereinD 1WithD 2For corresponding anti-paralleled diode, power tubeS 1WithS 2With power model electric capacity after series connectionC 0Parallel connection, quick by-pass switchK 1And IGCTK 2With power tubeS 2It is in parallel.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103066614A (en) * | 2012-12-31 | 2013-04-24 | 南方电网科学研究院有限责任公司 | Multi-end flexible direct current transmission system and starting method thereof |
| CN105990844A (en) * | 2015-02-15 | 2016-10-05 | 国家电网公司 | Real-time adjusting method for direct-current power with wind-power power fluctuation |
| CN107634534A (en) * | 2017-09-27 | 2018-01-26 | 南方电网科学研究院有限责任公司 | Flexible direct-current transmission converter major loop electric parameter acquisition methods and device |
| CN107947213A (en) * | 2016-10-12 | 2018-04-20 | 特变电工新疆新能源股份有限公司 | A kind of startup method of the Multi-end flexible direct current transmission system containing full-bridge modules |
-
2012
- 2012-12-31 CN CN2012207441054U patent/CN203071587U/en not_active Expired - Lifetime
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103066614A (en) * | 2012-12-31 | 2013-04-24 | 南方电网科学研究院有限责任公司 | Multi-end flexible direct current transmission system and starting method thereof |
| CN105990844A (en) * | 2015-02-15 | 2016-10-05 | 国家电网公司 | Real-time adjusting method for direct-current power with wind-power power fluctuation |
| CN105990844B (en) * | 2015-02-15 | 2019-02-22 | 国家电网公司 | A kind of method of real-time adjustment that dc power follows wind power to fluctuate |
| CN107947213A (en) * | 2016-10-12 | 2018-04-20 | 特变电工新疆新能源股份有限公司 | A kind of startup method of the Multi-end flexible direct current transmission system containing full-bridge modules |
| CN107947213B (en) * | 2016-10-12 | 2021-04-13 | 特变电工新疆新能源股份有限公司 | Starting method of multi-terminal flexible direct-current power transmission system with full-bridge module |
| CN107634534A (en) * | 2017-09-27 | 2018-01-26 | 南方电网科学研究院有限责任公司 | Flexible direct-current transmission converter major loop electric parameter acquisition methods and device |
| CN107634534B (en) * | 2017-09-27 | 2020-02-18 | 南方电网科学研究院有限责任公司 | Method for acquiring electrical parameters of main loop of flexible direct current transmission converter |
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