WO2022011760A1 - Procédé de démarrage d'un système de transmission de puissance à courant continu multi-terminal hybride - Google Patents

Procédé de démarrage d'un système de transmission de puissance à courant continu multi-terminal hybride Download PDF

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Publication number
WO2022011760A1
WO2022011760A1 PCT/CN2020/107342 CN2020107342W WO2022011760A1 WO 2022011760 A1 WO2022011760 A1 WO 2022011760A1 CN 2020107342 W CN2020107342 W CN 2020107342W WO 2022011760 A1 WO2022011760 A1 WO 2022011760A1
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control
voltage
vsc
lcc
current
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PCT/CN2020/107342
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English (en)
Chinese (zh)
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李周
魏子昂
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南京东博智慧能源研究院有限公司
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Publication of WO2022011760A1 publication Critical patent/WO2022011760A1/fr

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J1/00—Circuit arrangements for dc mains or dc distribution networks
    • H02J1/08—Three-wire systems; Systems having more than three wires
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J1/00—Circuit arrangements for dc mains or dc distribution networks
    • H02J1/10—Parallel operation of dc sources
    • H02J1/102—Parallel operation of dc sources being switching converters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0067—Converter structures employing plural converter units, other than for parallel operation of the units on a single load
    • H02M1/007—Plural converter units in cascade
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/32—Means for protecting converters other than automatic disconnection
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/36—Means for starting or stopping converters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
    • H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
    • H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/125—Avoiding or suppressing excessive transient voltages or currents
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/66—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal
    • H02M7/68—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters
    • H02M7/72—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/75—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means
    • H02M7/757—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only
    • H02M7/7575—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only for high voltage direct transmission link
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
    • H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0067—Converter structures employing plural converter units, other than for parallel operation of the units on a single load
    • H02M1/008—Plural converter units for generating at two or more independent and non-parallel outputs, e.g. systems with plural point of load switching regulators
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]

Definitions

  • the invention belongs to the technical field of electric power systems, relates to the safety and stability analysis technology of electric power systems, and in particular relates to a startup method of a hybrid multi-terminal direct current transmission system.
  • VSC-HVDC Flexible direct current transmission
  • LCC-HVDC traditional direct current transmission
  • VSC-HVDC will coexist and complement each other for a long time.
  • Hybrid DC transmission combines the advantages of traditional LCC-HVDC and VSC-HVDC, and can be applied to different scenarios by adopting different topologies.
  • the series-parallel hybrid multi-terminal DC transmission system has broad application prospects because it can meet the requirements of high-voltage and large-capacity DC transmission, and the existence of parallel VSC-HVDC improves the flexibility of power distribution in the entire system.
  • the complexity of the DC network topology also brings challenges to the startup strategy.
  • the technical problem to be solved by the present invention is to provide a startup method for a hybrid multi-terminal DC power transmission system in view of the deficiencies of the background technology.
  • the reference value is used to achieve different startup speeds, and the initialization strategy reduces the inrush current when the VSC controller is normally switched on.
  • a startup method for a hybrid multi-terminal direct current transmission system comprising i series LCCs on the rectifier side, j series LCCs on the inverter side, and k parallel VSCs on the inverter side, where i ⁇ 1, j ⁇ 1 , k ⁇ 1; specifically includes the following steps;
  • Step 1 close the LCC AC lines on the rectifier side and the inverter side, and disconnect each VSC AC line on the inverter side;
  • Step 2 select a suitable LCC converter station for constant current control, thereby limiting the bridge arm current of the inverter side VSC during the charging process;
  • Step 3 the non-constant current control station in the rectifier side LCC adopts constant voltage control, the inverter side non-constant current control station adopts constant arc extinguishing angle control, and the rectifier side LCC charges the inverter side LCC and VSC;
  • Step 4 Do not block each VSC on the inverter side, and each VSC can arbitrarily take constant voltage control, amplitude phase control, constant power control, clear the controller integrator, and at the same time put capacitor voltage equalization control or voltage equalization control on the multi-level VSC. wheel touch control;
  • Step 5 when the voltage of each converter station of the system rises to the rated value or reaches the upper limit value of the voltage, close the AC line of one or more VSCs on the inverter side at the same time, and initialize the controller of each VSC on the inverter side;
  • Step 6 Raise the VSC power reference value that adopts or maintain constant power control on the inverter side to the rated value according to the slope, and increase the LCC current reference value that adopts constant current control to the rated value or the upper limit of safe current according to the slope. The rate of ascent remains the same;
  • step 7 the AC system connected to the VSC with amplitude and phase control is put into operation in batches.
  • step 2 selecting an appropriate LCC converter station to perform constant current control is as follows:
  • Step 2.1 select the first converter station in the i series LCCs on the rectifier side for constant current control
  • Step 2.2 select the rth converter station in the i series LCCs on the rectifier side for constant current control, where 1 ⁇ r ⁇ i;
  • Step 2.3 select the s-th converter station in the j series-connected LCCs on the inverter side for constant current control, where 1 ⁇ s ⁇ j.
  • the step 3 is specifically as follows:
  • Step 3.1 when the first converter station in the i series LCCs on the rectifier side is selected for constant current control and the backup constant voltage control is adopted, the reference value of the constant voltage control satisfies
  • U dcR1 and U dcRmax are the voltage reference value and voltage upper limit of the first LCC on the rectifier side, respectively, and U dc(t) and U max(t) are the current DC voltage and voltage upper limit of the k-th VSC on the inverter side, respectively;
  • the constant voltage of other LCCs on the rectifier side is the rated value, and the fixed arc extinguishing angle of the inverter side LCC is the rated value; during the charging process, the LCC voltage on the inverter side gradually rises to the rated value, and then the VSC voltage gradually rises to the rated value;
  • Step 3.2 when the rth converter station in the i series LCCs on the rectifier side is selected for constant current control, where 1 ⁇ r ⁇ i, the first one on the rectifier side adopts constant voltage control, and the voltage command increases from 0 according to the slope To the rated value, the constant voltage of other LCCs on the rectifier side is the rated value, and the constant arc extinguishing angle of the LCC on the inverter side is the rated value; during the charging process, the voltage of each converter station gradually rises;
  • Step 3.3 when selecting the s-th converter station in the j series LCCs on the inverter side for constant current control, where 1 ⁇ s ⁇ j, the fixed arc-extinguishing angle of other LCCs on the inverter side is the rated value, and the rectifier side is the first
  • the voltage command increases from 0 to the rated value according to the slope, and the other LCC constant voltage on the rectifier side is the rated value; during the charging process, the voltage of each converter station gradually increases.
  • the step 5 is specifically as follows:
  • Step 5.1 reset the integral value of the VSC converter station that is maintained or switched to constant voltage control: for the outer loop proportional integrator, correspondingly set the initial value of the integrator to the actual electrical value;
  • the reset value of the integrator in the inner loop control is:
  • U c and U s are the rms voltage at the outlet of the AC side of the converter station and the rms value of the AC voltage at the common connection point
  • v dreset and v qreset are the integrator reset values in the d-axis control and the integrator reset values in the q-axis control.
  • the integrator reset values, R c and X c are the equivalent resistance and commutating reactance of the converter station, isd and i sq are the dq-axis components of the AC side current of the converter station, and P is the active power injected at the PCC point.
  • step 5.2 the integral value of the VSC converter station that is maintained or switched to amplitude-phase control is reset to:
  • Step 5.3 for a VSC converter station that maintains or switches to constant active power, the power reference value should be initialized as
  • I dc is the t (1 ⁇ t ⁇ k) charging current
  • U dc is the VSC rated DC voltage
  • the integral value in the outer loop control is reset to:
  • v dreset and v qreset are the integrator reset values in the d-axis and q-axis outer loop control, respectively, P ref and Q ref are the active power and reactive power reference values, respectively; the integrator reset value in the inner loop control for:
  • v dreset and v qreset are the integrator reset values in the d-axis and q-axis inner loop control, respectively
  • U sd and U sq are the dq-axis components of the AC voltage at the common connection point
  • isd and i sq are the converter stations The dq-axis component of the AC side current.
  • step 6 the current upper limit value satisfies:
  • I dcR(r) , I dci(s) and I dc(t) are the current values of the rectifier side LCC, the inverter side LCC and the inverter side VSC, respectively
  • I dcR(r)max , I dci(s) max and I dc(t)max are the corresponding current upper limit of each converter station, respectively.
  • the present invention adopts the above technical scheme, and has the following technical effects:
  • the dispatching system can freely choose the LCC converter station that adopts constant current control, and can freely specify the reference value of the constant current control of the LCC to achieve different starting speeds, and the initialization strategy reduces the normal input of the VSC controller. impulse current at time;
  • the startup method of the present invention includes i series LCCs on the rectifier side, j series LCCs on the inverter side, and k parallel VSCs on the inverter side. current without the current-limiting resistors required in traditional start-up methods, for both VSC connected active and passive networks;
  • the start-up speed of the present invention is relatively fast, and different start-up speeds can be achieved through different start-up currents.
  • This method is suitable for various single-bipolar series hybrid, parallel hybrid and series-parallel hybrid structures, and is suitable for two-, three-level and multi-level. level VSC, the proposed start-up method is general and applicable to a wide range.
  • Fig. 1 is that Fig. 1 is the flow chart of the startup method of the present invention
  • Fig. 2 is the general structure of the hybrid multi-terminal direct current transmission system to which the method of the present invention is applicable;
  • Figure 3 is a schematic diagram of a four-terminal hybrid DC transmission system
  • Figure 4 is the simulation waveform under the starting method, in which Figure 4(a) is the DC voltage of each converter station, Figure 4(b) is the DC line current, Figure 4(c) is the LCC1 firing angle and the LCC2 arc extinguishing angle, Figure 4(d) is the active power of each converter station, Figure 4(e) is the voltage (phase A) of the upper and lower arms of MMC3 and MMC4, and Figure 4(f) is the current (phase A) of the upper and lower arms of MMC3 and MMC4. .
  • a start-up method of a hybrid multi-terminal DC transmission system in which the dispatching system can freely choose the LCC converter station that adopts constant current control, and can freely specify the reference value of the constant current control of the LCC to achieve different start-up speeds, and at the same time initialize The strategy reduces the inrush current when the VSC controller is normally switched on.
  • the startup method of the present invention includes i LCCs in series on the rectifier side, j LCCs in series on the inverter side, and k VSCs on the inverter side in parallel. , as shown in Figures 2 to 3.
  • VSC charging process on the inverter side is not blocked, and constant voltage control, constant power control, and amplitude and phase control can be arbitrarily adopted, and at the same time, the multi-level MMC is put into capacitor voltage equalization control or wheel touch control;
  • VSC power reference value controlled by constant power on the inverter side is increased to the rated value according to the slope, and the LCC current reference value controlled by constant current is increased to the rated value according to the slope, and the rising speed of the two reference values remains the same;
  • the AC system connected to the VSC with amplitude and phase control will be put into operation in batches.
  • Step 1 At the initial moment of startup, close the LCC AC lines on the rectifier side and the inverter side, and disconnect the VSC AC lines on the inverter side;
  • Step 2 Select a suitable LCC converter station and adopt constant current control to limit the bridge arm current of the inverter side VSC during the charging process:
  • Step 3 The non-constant current control station in the rectifier side LCC adopts constant voltage control, the inverter side non-constant current control station adopts constant arc extinguishing angle control, and the rectifier side LCC charges the inverter side LCC and VSC:
  • U dcR1 and U dcRmax are the voltage reference value and upper limit of the first LCC on the rectifier side, respectively
  • U dc(t) and U max(t) are the current DC voltage and the upper limit of the voltage of the kth VSC on the inverter side, respectively.
  • the constant voltage of other LCCs on the rectifier side is the rated value, and the fixed arc extinguishing angle of the inverter side LCC is the rated value; during the charging process, the LCC voltage on the inverter side gradually rises to the rated value, and then the VSC voltage gradually rises to the rated value;
  • Step 4 Each VSC on the inverter side is not blocked, and each VSC can arbitrarily adopt constant voltage control, amplitude and phase control, and constant power control, clear the controller integrator, and at the same time put the capacitor voltage equalization control or wheel touch control;
  • Step 5 When the voltage of each converter station of the system rises to the rated value or reaches the upper limit value of the voltage, the AC lines of the k VSCs on the inverter side are closed at the same time, and the controllers of each VSC on the inverter side are initialized and assigned:
  • the reset value of the integrator in the inner loop control is:
  • U c and U s are the rms voltage at the outlet of the AC side of the converter station and the rms value of the AC voltage at the common connection point
  • v dreset and v qreset are the integrator reset values in the d-axis control and the integrator reset values in the q-axis control.
  • the integrator reset values, R c and X c are the equivalent resistance and commutating reactance of the converter station, isd and i sq are the dq-axis components of the AC side current of the converter station, and P is the active power injected at the PCC point.
  • the power reference value should be initialized as
  • I dc is the t (1 ⁇ t ⁇ k) charging current
  • U dc is the rated DC voltage of the VSC.
  • the integral value in the outer loop control is reset to:
  • v dreset and v qreset are the integrator reset values in the d-axis and q-axis outer loop control, respectively.
  • Pref and Qref are active power and reactive power reference values, respectively.
  • the reset value of the integrator in the inner loop control is:
  • v dreset and v qreset are the integrator reset values in the d-axis and q-axis inner loop control, respectively.
  • U sd and U sq are the dq-axis components of the AC voltage at the common connection point, and isd and i sq are the dq-axis components of the AC side current of the converter station.
  • Step 5 Raise the VSC power reference value that adopts or maintain constant power control on the inverter side to the rated value according to the slope, and increase the LCC current reference value that adopts constant current control to the rated value or the safe current upper limit according to the slope.
  • the rising speed remains the same, and the current upper limit value satisfies:
  • I dcR(r) , I dci(s) and I dc(t) are the current values of the rectifier side LCC, the inverter side LCC and the inverter side VSC, respectively, I dcR(r)max , I dci(s)max and I dc(t)max is the upper limit of the corresponding current of each converter station, respectively.
  • Step 7 The AC system connected to the VSC with amplitude and phase control is put into operation in batches.
  • the startup method proposed by the present invention will be specifically described.
  • the constant current of LCC1 on the rectifier side is 3kA
  • the constant arc extinguishing angle is 17° for LCC2 on the inverter side
  • the constant voltage of MMC3 and MMC4 on the inverter side is 400kV and -600MW respectively.
  • the rated voltage of the DC line is 800kV.
  • Fig. 4(a) is the DC voltage of each converter station
  • Fig. 4(b) is the DC line current
  • Fig. 4(c) is the LCC1 firing angle and LCC2 arc extinguishing angle
  • Fig. 4(a) is the DC voltage of each converter station
  • Fig. 4(b) is the DC line current
  • Fig. 4(c) is the LCC1 firing angle and LCC2 arc extinguishing angle
  • Fig. 4(b) is the DC line current
  • Fig. 4(c) is the LCC1 firing angle and LCC2 arc extinguishing angle
  • FIG. 4(d) is each converter station Active power
  • Figure 4(e) is the voltage (phase A) of the upper and lower bridge arms of MMC3 and MMC4
  • Figure 4(f) is the current (phase A) of the upper and lower bridge arms of MMC3 and MMC4; for the proposed startup method: rectifier side
  • the LCC constant current control limits the possible overcurrent during the MMC charging process, and the MMC initialization strategy reduces the impact when the MMC controller starts to run normally, and the startup speed is faster, which is beneficial to the safety of the entire hybrid DC transmission system. Stable operation.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Rectifiers (AREA)
  • Inverter Devices (AREA)

Abstract

Procédé de démarrage d'un système de transmission de puissance à courant continu multi-terminal hybride, le procédé consistant à : fermer des circuits à courant alternatif d'un LCC côté redressement et d'un LCC côté inversion, et déconnecter un circuit à courant alternatif d'un VSC côté inversion ; une station LCC utilisant une commande de courant constant, le LCC côté inversion utilisant une commande d'angle d'extinction fixe, et le LCC côté redressement chargeant le LCC côté inversion et le VSC côté inversion ; le VSC côté inversion n'étant pas verrouillé pendant le processus de charge, et effectuer une commande d'égalisation de tension de condensateur ou une commande tactile alternée sur un MMC en même temps ; fermer le circuit de courant alternatif du VSC côté inversion, et initialiser l'attribution de valeur d'un dispositif de commande du VSC côté inversion ; augmenter une valeur de référence de puissance VSC sous une commande de puissance constante sur un côté inversion jusqu'à une valeur nominale selon une pente, augmenter une valeur de référence de courant LCC sous une commande de courant constant à une valeur nominale selon une pente, et maintenir la vitesse d'augmentation pour les deux valeurs de référence ; et entrer, en lots, des systèmes à courant alternatif connectés à un VSC qui utilise une commande d'amplitude et de phase. Au moyen du procédé de démarrage, différentes vitesses de démarrage sont réalisées, et un courant d'impact pendant l'entrée normale d'un dispositif de commande VSC est réduit.
PCT/CN2020/107342 2020-07-16 2020-08-06 Procédé de démarrage d'un système de transmission de puissance à courant continu multi-terminal hybride WO2022011760A1 (fr)

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CN202010684829.3 2020-07-16
CN202010684829.3A CN112039104B (zh) 2020-07-16 2020-07-16 一种混合多端直流输电系统的启动方法

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