WO2018176599A1 - Procédé et système de simulation transitoire électromécanique à base de mmc pour réseau électrique à courant continu haute tension basé sur convertisseur de source de tension et à courant continu - Google Patents

Procédé et système de simulation transitoire électromécanique à base de mmc pour réseau électrique à courant continu haute tension basé sur convertisseur de source de tension et à courant continu Download PDF

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WO2018176599A1
WO2018176599A1 PCT/CN2017/084529 CN2017084529W WO2018176599A1 WO 2018176599 A1 WO2018176599 A1 WO 2018176599A1 CN 2017084529 W CN2017084529 W CN 2017084529W WO 2018176599 A1 WO2018176599 A1 WO 2018176599A1
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model
transient
flexible
voltage
grid
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PCT/CN2017/084529
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Chinese (zh)
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刘栋
寇龙泽
庞辉
贺之渊
朱琳
吴学光
林畅
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全球能源互联网研究院有限公司
国家电网公司
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Publication of WO2018176599A1 publication Critical patent/WO2018176599A1/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
    • 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
    • H02J3/04—Circuit arrangements for ac mains or ac distribution networks for connecting networks of the same frequency but supplied from different sources
    • H02J3/06—Controlling transfer of power between connected networks; Controlling sharing of load between connected networks
    • 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
    • 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]
    • 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 relates to a digital simulation technology of flexible direct current transmission, in particular to an MMC-based flexible DC and DC grid electromechanical transient simulation method and system.
  • VSC-HVDC Voltage Source Converter Based High Voltage Direct Current
  • MMC Modular Multilevel Converter
  • MMC contains a large number of power electronic switching devices, which are suitable for simulating the internal dynamic process and corresponding control strategies using electromagnetic transient simulation tools, such as bridge arm circulation control and sub-module capacitor voltage balance control.
  • electromagnetic transient simulation tools such as bridge arm circulation control and sub-module capacitor voltage balance control.
  • some related MMC efficient electromagnetic transient modeling methods have been proposed and widely used.
  • electromagnetic transient simulation must perform equivalent simplification of the AC system when performing large-scale AC-DC grid simulation, which will lead to the difference between the dynamic characteristics of the AC system model and the actual grid. It also affects the accuracy of the final simulation results.
  • the object of the present invention is to provide an MMC-based flexible DC and DC grid electromechanical transient simulation method and system, and the invention establishes an accurate and practical flexible DC and DC grid electromechanical transient simulation model. Through the joint simulation with the actual grid operation data, a more accurate transient stability result of the AC-DC grid can be obtained.
  • the invention provides an electromechanical transient simulation method for a flexible DC and DC grid based on an MMC converter, which is improved in that it comprises:
  • a transient simulation model including a steady-state tidal current model based on a controlled current source, an AC-side transient model, and a DC-side transient model.
  • the steady-state tidal current model based on the controlled current source is used to generate transient simulations.
  • the transient simulation model is used to simulate the electromechanical transient operation characteristics of flexible DC and DC grid under different working conditions.
  • the injected bus current is used as a steady state power flow model, and the MMC converter is equivalent to a PQ node or a PV node;
  • the current phasor injected into the bus is:
  • V R +jV I is the injected bus voltage phasor
  • P ref and Q ref are the active power and reactive power of the positive injection into the bus
  • I R and I I respectively represent the current phasors injected into the bus.
  • Part and imaginary part V R and V I respectively represent the real part and the imaginary part of the voltage phasor injected into the bus bar;
  • the direction of the injected bus is positive.
  • the value of the reactive power reference value Q ref is determined by integrating the difference between the bus voltage reference value and the feedback value, and the remaining parameters are changed with MMC.
  • the streamer equivalent should be the same for the PQ node.
  • AC side transient model is:
  • v c represents the voltage at the outlet of the converter valve
  • v p represents the bus voltage of the common junction PCC
  • i is the current on the AC bus
  • R c and L c are the equivalent resistance and equivalent reactance of the AC side
  • L t , R t are the equivalent reactance and equivalent resistance of the converter transformer, respectively, and the equivalent resistance and equivalent reactance of the converter transformer Close to 0, L arm and R arm are the bridge arm reactance and the bridge arm equivalent resistance respectively
  • v pd and v pq are the voltage of the common junction bus bar PCC on the d axis and the voltage on the q axis, respectively.
  • the DC-side transient model includes establishing a controlled DC current source I dc and an equivalent capacitance C eq ;
  • N is the number of sub-modules of the MMC single bridge arm;
  • C sm is the capacitance in the sub-module;
  • P dc is the power of the controlled current source;
  • U dc is the voltage of the controlled current source;
  • P ac and P loss are respectively AC
  • v cd and v cq are the outlet voltages of the d-axis and the q-axis of the MMC converter, respectively;
  • i d and i q are the components of the alternating current on the d and q axes, respectively. .
  • the method further includes establishing a control system model, and adopting a dq-axis decoupling control mode of a double closed-loop control structure, including an outer loop controller and an inner loop controller; the outer loop controller is based on an initial power of active power and reactive power Data and additional reference increments for generating reference values i dref and i qref of the alternating current dq axis component of the inner loop controller;
  • the inner loop current controller takes the output of the outer loop controller as a reference value, and uses the current measured value after the dq transform as a feedback amount, and uses the decoupling negative feedback PI control structure to implement tracking control of the instantaneous value of the PCC current.
  • the inner loop current controller is represented by an outlet voltage of the d-q axis of the MMC converter, respectively:
  • v p is the amplitude of the PCC bus voltage of the common junction point
  • P ref and Q ref are the reference values of the active power and the reactive power, respectively
  • i dref and i qref are reference values of the d-axis component and reference values of the q-axis component, respectively
  • v pd , v pq the voltage of the common junction bus bar PCC on the d-axis, the voltage on the q-axis;
  • U dc is the current DC Voltage
  • U dc0 is the initial DC voltage after each MMC converter is stabilized
  • T c is the delay generated by the modulation process, and is ignored after phase compensation;
  • K pd and K pq are the proportional coefficients
  • the alternating current phasor in the control system model is converted into a synchronous rotating dq coordinate system based on the PCC bus voltage, and is used by the inner loop controller to control the alternating currents i d , i q , including:
  • I PI and I PR are the real and imaginary parts of the components i d and i q of the alternating current on the d and q axes, respectively;
  • V PI and V PR are the real parts of the phasors of the PCC bus voltage, respectively.
  • the imaginary part is the imaginary part.
  • the method further includes at least one additional module for performing function expansion based on the outer loop control structure, the add-on module providing latching signal generation logic on the AC side and the DC side of the flexible DC and DC grid, through the flexible DC and DC grid The outer ring control structure of the AC side and the DC side is connected.
  • transient simulation model is used to simulate the electromechanical transient operation characteristics of the flexible DC and DC grid under different working conditions, including:
  • the steady state power flow model is used to generate initial power flow data required for transient simulation
  • the AC side transient model is used to simulate the dynamic characteristics of the flexible DC and DC grid AC side;
  • the control system model is used to simulate the control characteristics of the AC side of the flexible DC and DC grid, including: constant AC/DC voltage control, active/reactive power emergency boost/return control function;
  • the DC side transient model is used to simulate a transient steady state process of voltage and current on a DC side of a flexible DC and DC power grid;
  • the add-on module is used to simulate the MMC inverter blocking feature and additional control functions.
  • the invention also provides an electromechanical transient simulation system for a flexible DC and DC grid, the improvement comprising the following:
  • Modeling module Establishing a transient simulation model, including a steady-state tidal current model based on a controlled current source, an AC-side transient model, and a DC-side transient model, wherein the steady-state tidal current model based on the controlled current source is used to generate a temporary Initial trend data required for state simulation;
  • Simulation module It is used to simulate the electromechanical transient operation characteristics of flexible DC and DC grid under different working conditions by using transient simulation model.
  • modeling module further includes:
  • Power flow model modeling module used to establish initial power flow data required for generating transient simulation, steady state power flow model based on controlled current source;
  • AC model modeling module used to establish an AC-side transient model for simulating the dynamic characteristics of the flexible DC and DC grid AC side;
  • Control system modeling module used to establish the control characteristics of the analog flexible DC and DC grid AC side, including: control system model of constant AC/DC voltage control, active/reactive power emergency boost/return control function;
  • DC model modeling module a DC-side transient model for establishing a transient steady-state process for simulating the DC side voltage and current of a flexible DC and DC grid;
  • Additional module modeling module used to establish the blocking characteristics and additional control functions of the analog MMC inverter.
  • the invention provides an MMC-based flexible DC and DC grid electromechanical transient simulation modeling method, which can accurately simulate the transient characteristics and control characteristics of the flexible DC AC side and the DC side, and can realize fault commutation Features such as latching and additional controls.
  • the user-defined function module based on commercial electromechanical transient simulation software establishes the electro-mechanical transient simulation model of flexible DC, and compares it with the detailed electromagnetic transient simulation model in PSCAD/EMTDC to verify the simulation accuracy of the electromechanical model.
  • the proposed method provides a guiding reference for the electromechanical transient simulation of large-scale AC/DC systems, and plays a technical support role for the preliminary planning and system design of practical flexible DC and DC grid projects. specific:
  • the invention proposes a steady-state tidal current model based on a controlled current source. Without considering the initial value calculation of the DC network, the calculation process of the steady-state tidal current model is simplified without affecting the accuracy and stability of the transient simulation. Improve the scalability of the model.
  • the invention proposes a model optimization method that considers the dynamic characteristics of the MMC modulation process and improves the electromechanical mode. Type simulation accuracy for transient processes.
  • the corresponding double-ended flexible DC model and the four-terminal DC grid model are established in the commercial electromechanical transient simulation software, and simulated by the detailed electromagnetic transient model in PSCAD/EMTDC. Contrast, verifying the accuracy and effectiveness of the model.
  • FIG. 1 is a flow chart of an MMC-based flexible DC and DC grid electromechanical transient simulation modeling method provided by the present invention
  • FIG. 2 is a schematic diagram of a steady-state tidal current model with a two-end system as an example of the present invention
  • (a) is a schematic diagram of a steady-state tidal current model of the busbar 1
  • (b) is a schematic diagram of a steady-state tidal current model of the busbar 2;
  • FIG. 3 is a schematic diagram of an equivalent circuit of an AC side of an MMC converter provided by the present invention.
  • FIG. 4 is a schematic diagram of a user-defined model and a main program interface circuit provided by the present invention.
  • Figure 5 is a structural diagram of an outer ring controller provided by the present invention.
  • Figure 6 is a structural diagram of an inner ring controller provided by the present invention.
  • FIG. 7 is a schematic diagram of a DC network equivalent model of a two-end system provided by the present invention.
  • FIG. 8 is a logic diagram of the latching signal generation provided by the present invention.
  • FIG. 1 The flow chart of the electromechanical transient simulation modeling method for the flexible DC and DC grid proposed by the present invention is shown in FIG. 1 and includes:
  • S1 Establish 1) steady-state tidal current model based on controlled current source; 2) AC-side transient model; 3) control system model; 4) DC-side transient model and 5) other additional functional modules;
  • the method further includes: determining a steady-state tidal current parameter, that is, determining an injection bus voltage, current, active power, and reactive power of the MMC converter.
  • each converter station can be equivalent to one PQ node or PV node.
  • the converter station uses the controlled current source for equivalent, and controls the power interaction with the AC system by controlling the current injected into the bus.
  • the given values of active power and reactive power are P ref and Q ref (positive to the direction of the injected bus), and the bus voltage phasor is V R +jV I , then the injection
  • the phasor of the bus current is:
  • I R and I I represent the real and imaginary parts of the current phasor injected into the bus, respectively; V R and V I represent the real and imaginary parts of the voltage phasor injected into the bus, respectively.
  • the reactive power setpoint Q ref can be determined by integrating the difference between the bus voltage setpoint and the feedback value. If the losses of the converter and the DC line are ignored, the active power of each converter station satisfies the law of conservation of power. Ignoring the power loss may bring some errors in the power flow calculation, but it does not affect the subsequent transient stability simulation (transient stability simulation may take a period of oscillation to re-adjust the power flow calculation results), and simplify the steady state model. .
  • S102 Establish an AC side transient model, and the schematic diagram is as shown in FIG. 3, including:
  • the mathematical model under the three-phase stationary coordinate system is established, and then the mathematical model under the three-phase stationary coordinate system is converted to the dq synchronous rotating coordinate system by Park-Clark transformation, and the three-phase time-varying The variable is converted to a constant amount of DC for easy controller design.
  • the mathematical model of the MMC AC side in the synchronous rotating coordinate system is:
  • v c represents the voltage at the outlet of the converter valve
  • v p represents the bus voltage of the Point of Common Connection (PCC).
  • i is the current on the AC bus
  • R c and L c are the equivalent resistance and equivalent reactance on the AC side
  • L t , R t are the equivalent reactance and equivalent resistance of the converter transformer, respectively, and the commutation
  • the equivalent resistance and equivalent reactance of the transformer are close to 0, L arm and R arm are the bridge arm reactance and the bridge arm equivalent resistance respectively;
  • v pd and v pq are the voltages of the common junction bus bar PCC on the d axis, respectively.
  • Rs and Ls are the equivalent resistance and equivalent reactance of the AC side power supply, respectively.
  • L t and R t are the equivalent reactance and resistance of the converter transformer respectively
  • L arm and R arm are the bridge arm reactance and the bridge arm equivalent resistance respectively
  • v pd and v pq are the common joint point bus bar PCC at d respectively The voltage of the shaft and the voltage at the q-axis.
  • the interface between the AC side model and the PSASP main program is implemented by setting a transformer branch.
  • the schematic diagram of the user-defined model and the main program interface circuit is shown in Figure 4.
  • the function of the transformer branch is as follows: 1) provide the feedback data of the main program for the custom model; 2) simulate the wiring mode of the actual engineering converter transformer to ensure Simulation accuracy under failure. Since the actual transformer parameters are already included in equation (3), in order to avoid affecting the accuracy of the control system, the equivalent resistance and equivalent reactance of the transformer should be set close to zero.
  • the control system of the model adopts the dq axis decoupling control method of the double closed loop control structure.
  • the function of the outer loop controller is to generate reference values i dref and i qref for the dq axis component of the alternating current in the inner loop controller.
  • the design of the outer loop controller has different methods. The method is based on the reference values of active power and reactive power, and directly calculates the reference value of the dq axis component of the alternating current by using equation (4), where V p is the amplitude of the PCC bus voltage. value. This control method has a relatively fast dynamic response.
  • the PI feedback control can be used to generate a reference value of the corresponding active power or reactive power.
  • the initial reference values P0, Q0, Uac0 of the outer loop controller are derived from the calculation of steady state power flow, and the initial set value Udc0 of the DC voltage is usually set to 1 pu.
  • the outer loop controller also adds a current limiting link based on the power original image to prevent overcurrent from damaging the converter, and at the same time limits the active power and reactive power interacting with the AC system, making the electromechanical transient simulation more Close to the actual operating conditions of the project.
  • the structure of the outer ring controller is shown in Figure 5.
  • the inner loop current controller takes the output of the outer loop controller as a reference value, and uses the current measured value after the dq transform as the feedback amount, and uses the decoupling negative feedback PI control structure to realize the tracking control of the instantaneous value of the PCC current.
  • the structure of the inner loop controller is shown in Figure 6. Only the positive sequence current control is considered.
  • the calculation formula of the converter outlet voltage v cd , v cq is as follows:
  • the MMC and the valve-based control system are equivalent to a first-order inertia.
  • the converter outlet voltage can be expressed as:
  • v p is the amplitude of the PCC bus voltage of the common junction point
  • P ref and Q ref are the reference values of the active power and the reactive power, respectively
  • i dref and i qref are reference values of the d-axis component and reference values of the q-axis component, respectively
  • v pd , v pq the voltage of the common junction bus bar PCC on the d-axis, the voltage on the q-axis;
  • U dc is the current DC Voltage
  • U dc0 is the initial DC voltage after each MMC converter is stabilized
  • T c is the delay generated by the modulation process, and is ignored after phase compensation;
  • K pd and K pq are the proportional coefficients
  • the dynamic process of PLL control can be neglected, and the phase angle of the PCC point bus voltage can be directly obtained from the main program of the system. Since the inner loop controller needs to control the alternating current, it is necessary to convert the phasor of the alternating current into a coordinate system based on the PCC bus voltage.
  • RI is a synchronous rotating coordinate system based on the system slack node
  • dq is a synchronous rotating coordinate system based on the PCC bus voltage.
  • the phasor of the PCC bus voltage obtained from the main program is V PR +jV PI , alternating current
  • the phasor is I PR +jI PI
  • the expression of the alternating current dq axis is:
  • I PI and I PR are the real and imaginary parts of the components i d and i q of the alternating current on the d and q axes, respectively;
  • V PI and V PR are the real parts of the phasors of the PCC bus voltage, respectively.
  • the imaginary part is the imaginary part.
  • S104 Establishing a DC-side transient state model, taking the two-end system as an example.
  • the schematic diagram of the DC network equivalent model is shown in FIG. 7 and includes:
  • the MMC DC-side transient model consists of a controlled DC current source Idc and an equivalent capacitor Ceq. Since the dynamic characteristics of the DC side of the MMC are determined by the capacitance C sm distributed in the submodule, the value of the DC side equivalent capacitance Ceq needs to be obtained from C sm . According to the law of conservation of energy:
  • N is the number of submodules of the MMC single bridge arm. According to the law of conservation of power, the active power of the MMC AC side should be equal to the active power of the DC side plus the loss of the converter, so the equivalent DC current source can be expressed as:
  • a ⁇ -type RLC circuit can be used to simulate the DC line.
  • the capacitance of the DC cable to the ground is usually smaller than the equivalent capacitance on the DC side.
  • the influence on the external characteristics and control characteristics of the inverter is limited, so it can be neglected during the modeling process.
  • the DC network can be further reduced to an RL circuit.
  • the corresponding DC-side circuit equations can be written and the corresponding model can be established according to the equation.
  • S105 establishes additional functional modules, including:
  • the modeling method proposed by the invention realizes the function of MMC blocking.
  • the opening and closing of the MMC sub-module cannot be realized, and there is no electrical direct connection between the AC side and the DC side. Therefore, the locking process of the MMC can only be simulated by modifying the corresponding mathematical model. .
  • the inverter current should exceed the threshold.
  • the inverter should be quickly blocked.
  • the DC voltage rises or falls rapidly and exceeds the threshold
  • the inverter should also be quickly blocked. Therefore, the logic of the blocking signal generation can be added to the model according to the actual control protection system.
  • the blocking signal generation logic is as shown in FIG. 8.
  • the impedance of the transformer branch is set to infinity to simulate the action of the AC side circuit breaker tripping.
  • the steady state power flow model is the basis of the transient simulation to generate the initial power flow data required for the transient simulation.
  • the main function of the AC side transient model and the control system model is to simulate the dynamic characteristics and control performance of the flexible DC AC side.
  • the control system adopts the double closed-loop vector control method based on dq rotating coordinate system which is common in engineering, which can realize the control functions of constant AC/DC voltage control and active/reactive power emergency boost/return.
  • the DC side model is used to simulate the transient steady-state process of the DC side voltage and current of the flexible DC and DC grid.
  • the dynamic characteristics are determined by the DC side equivalent capacitance.
  • the AC-DC side models are connected by power balance, that is, the AC side active power is equal to the sum of the DC side active power and the converter loss. Additional functions include DC side fault simulation, converter blocking simulation and other additional control strategies to ensure that the model can more accurately simulate the operating characteristics of the actual system under different operating conditions.
  • the modeling method proposed by the present invention has a modulus The block-like features can be easily extended to any end-point multi-terminal DC system and DC grid.
  • the modeling method has good scalability, and different additional control strategies can be added by modifying the outer loop control structure. For example, a corresponding additional frequency control measure may be added for the frequency stabilization and low frequency oscillation suppression of the AC system, or a corresponding multi-commutation station coordinated control strategy may be added for the safe and stable operation of the DC power grid.
  • the present invention also provides an electromechanical transient simulation system for a flexible DC and DC grid based on an MMC converter, comprising:
  • Modeling module used to establish a steady-state tidal current model based on a controlled current source, an AC-side transient model, a control system model, a DC-side transient model, and an additional functional model;
  • Simulation module used to simulate the electromechanical transient operation characteristics of flexible DC and DC grid under different working conditions by using the above model.
  • the modeling module further includes:
  • Power flow model modeling module used to establish initial power flow data required for generating transient simulation, steady state power flow model based on controlled current source;
  • AC model modeling module used to establish an AC-side transient model for simulating the dynamic characteristics of the flexible DC and DC grid AC side;
  • Control system modeling module used to establish the control characteristics of the analog flexible DC and DC grid AC side, including: control system model of constant AC/DC voltage control, active/reactive power emergency boost/return control function;
  • DC model modeling module a DC-side transient model for establishing a transient steady-state process for simulating the DC side voltage and current of a flexible DC and DC grid;
  • Additional Model Modeling Module An additional functional model for establishing analog DC side faults and MMC converter blocking characteristics.
  • the invention develops a double-ended flexible DC model and a four-terminal DC grid model based on the user-defined model function of the commercial electromechanical transient simulation software PSASP, and has been used for system simulation analysis of multiple practical projects, engineering planning and Construction has guiding significance.
  • This modeling method can also be applied to other commercial software such as PSS/E.

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  • Supply And Distribution Of Alternating Current (AREA)
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Abstract

L'invention concerne un procédé et un système de simulation et de modélisation transitoire électromécanique à base de MMC pour un réseau électrique à courant continu haute tension basé sur un convertisseur de source de tension (VSC-HVDC) et à courant continu. Le procédé consiste : à établir un modèle de simulation transitoire comprenant un modèle de tendance d'état stable sur la base d'une source de courant commandée, d'un modèle transitoire de courant alternatif et d'un modèle transitoire de courant continu, le modèle de tendance d'état stable sur la base de la source de courant commandée étant utilisé afin de générer des données de tendance initiale requises pour une simulation transitoire (S1); et à simuler, au moyen du modèle de simulation transitoire, une caractéristique de fonctionnement transitoire électromécanique d'un réseau électrique à VSC-HVDC et à courant continu dans différentes conditions de fonctionnement (S2). En ne prenant pas en considération le calcul de valeur initiale d'un réseau électrique à courant continu, le procédé et le système simplifient le modèle de tendance d'état stable sans affecter la précision et la stabilité de simulation transitoire, et améliorent l'extensibilité du modèle.
PCT/CN2017/084529 2017-03-31 2017-05-16 Procédé et système de simulation transitoire électromécanique à base de mmc pour réseau électrique à courant continu haute tension basé sur convertisseur de source de tension et à courant continu WO2018176599A1 (fr)

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CN201710204912.4A CN107123981B (zh) 2017-03-31 2017-03-31 基于mmc的柔性直流及直流电网机电暂态仿真方法及系统
CN201710204912.4 2017-03-31

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CN112072690A (zh) * 2020-09-30 2020-12-11 华中科技大学 一种lcc-mmc串联型混合直流输电系统的建模方法
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