WO2022041363A1 - Procédé d'initialisation de commande de dispositif électronique de puissance - Google Patents

Procédé d'initialisation de commande de dispositif électronique de puissance Download PDF

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Publication number
WO2022041363A1
WO2022041363A1 PCT/CN2020/116987 CN2020116987W WO2022041363A1 WO 2022041363 A1 WO2022041363 A1 WO 2022041363A1 CN 2020116987 W CN2020116987 W CN 2020116987W WO 2022041363 A1 WO2022041363 A1 WO 2022041363A1
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WIPO (PCT)
Prior art keywords
control
integrator
power electronic
value
initialization method
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PCT/CN2020/116987
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English (en)
Chinese (zh)
Inventor
李周
詹若培
Original Assignee
东南大学溧阳研究院
东南大学
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Application filed by 东南大学溧阳研究院, 东南大学 filed Critical 东南大学溧阳研究院
Publication of WO2022041363A1 publication Critical patent/WO2022041363A1/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
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/381—Dispersed generators
    • 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
    • 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
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
    • H02J2300/20—The dispersed energy generation being of renewable origin
    • H02J2300/28—The renewable source being wind energy
    • 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 power electronics, and relates to a control initialization method for power electronic equipment.
  • VSC-HVDC high voltage direct current transmission technology based on voltage source converter
  • DFIG double-fed induction motor
  • SVC static reactive power compensator
  • STATCOM static Synchronous compensator
  • the control strategy of power electronic equipment needs a suitable control initialization method.
  • the traditional control initialization method first sets the control target reference value to be the same as the actual value to reduce the influence of control startup, and after the system is stabilized, the reference value will be changed to the ideal value.
  • the initial value of the integrator is unknown before the control strategy for the power electronic device starts, it will bring unpredictable problems, so the output value of the integrator needs to be reset to zero.
  • clearing the initial value of the integrator is one of the reasons for the circuit shock during the control start-up process, which leads to a larger shock at the start of some control strategies, thus increasing the difficulty of control start-up. This is because the initial value of the integrator is cleared, and the output value of the integrator is zero, which causes the control quantity to be different from the corresponding electrical quantity in the actual circuit.
  • the present invention provides a control initialization method for power electronic equipment.
  • the initial value of the integral is considered according to the actual circuit model to reduce the impact caused by the start of the control strategy, which can improve the control of power electronic equipment.
  • the strategy's startup stability, while improving the startup speed, enables power electronic devices to have more application scenarios.
  • the present invention provides the following technical solutions:
  • a power electronic equipment control initialization method comprising the following steps:
  • step (2) According to the setting value information required by the control loop in step (1), realize the setting of the initial value of the integrator in the control loop, and lock the initial value of the integrator before starting the control;
  • the target control strategy reference value is set as the electrical quantity measurement value obtained in step (1), and the control system sends the control start signal to the modulation and valve group control to start the control strategy.
  • step (2) after the initial value of the integrator is locked, the initial value of the integrator in the control loop is equal to the set value of the integrator.
  • the setting value information required by the control loop includes: the control target reference value and the setting value of the integrator.
  • the activation of the control strategy includes: activation of the control strategy when the device valve is unlocked and switching of the device control strategy.
  • the power electronic equipment includes: STATCOM static synchronous compensator, SVC static reactive power compensator, TCSC controllable series compensator, UPFC unified power flow controller, DFIG double-fed induction motor, and HVDC high-voltage direct current transmission system.
  • the initial value of the integrator is set as follows:
  • Us is the AC voltage at the PCC point of the converter
  • Ps and Qs are the active power and reactive power at the PCC point, respectively
  • X is the commutation impedance
  • K I and K P are the proportional coefficients set by the integrator and the proportional link
  • the time t 0 is the unlocking time
  • the time t 1 is a certain time after the actual operation
  • U sref is the reference value of the AC voltage.
  • the four integrators are set in the following ways:
  • P s is the active power on the grid side of the converter
  • U s is the RMS AC voltage on the grid side of the converter
  • U c is the RMS AC voltage at the PCC point
  • t 0 is the start time of the control strategy
  • Q s is the grid side Reactive power
  • i sd and i sq are the d and q axis components of the grid-side AC current respectively
  • X c is the equivalent impedance of the commutation inductance
  • R is the equivalent resistance of the converter.
  • t 0 is the start time of the control strategy
  • t 1 is a certain time when the control strategy is in normal operation
  • V dc is the DC voltage of the converter
  • V dcref is the DC voltage reference value
  • Q sref is the reactive power reference value
  • i sdref is the d-axis current reference value
  • i sqref is the q-axis current reference value.
  • the present invention has the following advantages and beneficial effects:
  • the invention realizes that when the control strategy is initialized, the initial value of the integrator in the control system and the reference value of the control target are adjusted, the circuit impact is reduced, the rapidity and stability of the power electronic equipment control during startup are improved, and the power electronic equipment is improved. It provides more application scenarios and can be widely used in the field of power electronics.
  • FIG. 1 is a schematic diagram of a power electronic device control initialization method of the present invention
  • Fig. 2 is the flow chart of the power electronic equipment control initialization method of the present invention
  • FIG. 3 is a schematic diagram for verifying the flexible straight grid-connected system of the microgrid of the present invention.
  • Figure 4 is a schematic diagram of the amplitude and phase control of the flexible DC transmission
  • Fig. 5 is a simulation result diagram for verifying the microgrid via the flexible straight grid-connected system of the present invention, wherein (a) is the AC busbar voltage (effective value) of the microgrid, (b) is the frequency of the microgrid AC bus, and (c) is the The active power of the PCC point of VSC1, (d) is the a-phase current of VSC1, (e) is the DC voltage of VSC1;
  • FIG. 6 is a schematic diagram for verifying the grid-side control of the doubly-fed fan of the present invention.
  • Figure 7 shows a control loop with an integrator.
  • the invention provides a control initialization method for power electronic equipment.
  • the control strategy of the power electronic equipment needs to be started, in order to reduce the impact of the start-up process, it is adopted before the target control strategy is started to perform initialization.
  • One or more control loops of the power electronic equipment control system include an integrator, which uses a certain control strategy to control the valve stage, thereby realizing the corresponding functions of the power electronic equipment.
  • a control loop with an integrator is generally shown in Figure 7.
  • the input variable r n (t) of a control loop of the control system obtains the output variable c n (t) through the integrator, and its output value is continuously integrated from the initial control time, and is related to the initial value of the integration.
  • the startup of the power electronic equipment control strategy includes the process of starting the control strategy when the valve control of the equipment is unlocked, and switching the equipment control strategy. It should be noted that the startup refers to the startup of a certain control strategy, and does not mean the startup of the power electronic device.
  • the power electronic device may be in an operating state, and the operating state does not necessarily need to be a steady state.
  • the power electronic equipment control initialization method provided in this example includes the following steps:
  • the state is obtained from the measured electrical quantities of the actual system, and the real-time electrical quantity data related to the control part is collected.
  • the setting value information required by the control loop is obtained. It should be noted that the real-time electrical quantity data is the electrical quantity necessary for the original control, and there is no need to add a new measurement interface, and the system collects the actual electrical quantity value at all times.
  • the setting value information required by the control loop including the control target reference value and the setting value of the integrator;
  • the output value of (t 0 ) is equal to the initial value, that is, the setting value of the integrator, which can ensure that there is no deviation between the output value and the actual value when the control starts.
  • the initial value of the integrator in the control loop is set, because the output of the integrator satisfies:
  • t 0 is the starting time of the control strategy
  • t 1 is a certain time when the control strategy is running normally
  • rn ( ⁇ ) is the input of the integrator.
  • c n (t 0 ) is the initial value that the integrator needs to set, and it usually needs to be calculated according to the actual circuit and mathematical model of the system.
  • FIG. 3 it is an application of the present invention in the flexible direct current transmission VSC-HVDC
  • FIG. 4 is a block diagram of amplitude and phase control.
  • the figure shows a double-ended VSC-HVDC system, and the left end is an equivalent microgrid system, which includes generator sets, motor sets, and fixed loads and energy storage devices.
  • the AC bus voltage is 500kV
  • the voltage source converter VSC AC voltage is 255kV
  • the DC voltage is ⁇ 250kV
  • the DC capacitance 500uF.
  • the equivalent generator set outputs 375MW of active power
  • the equivalent motor set consumes 150MW of active power
  • the fixed load is 225MW.
  • the VSC-HVDC is put into operation, the VSC at the micro grid end is controlled by amplitude and phase, and the VSC at the main grid end is controlled by constant DC voltage.
  • the AC bus voltage of the micro-grid is measured before 10s, and the phase and AC amplitude required for the amplitude-phase control are obtained as the control target reference value of the control strategy.
  • the reference value U sref of the AC voltage at the PCC point controlled by the amplitude and phase is set to 229kV, and the initial value of the integrator is set as follows:
  • K I and K P are the proportional coefficients set by the integrator and the proportional link
  • the time t 0 is the unlocking time
  • the time t 1 is a certain time after the actual operation
  • U sref is the reference value of the AC voltage.
  • the AC outlet side voltage of the VSC is calculated or directly measured from the above process, and this voltage is used as the initial value of the amplitude-phase control integrator, and the initial value of the integrator is locked before the control strategy is started.
  • a control start signal is sent to the control loop and the VSC valve stage control, and then the initial value of the integrator is unlocked.
  • the frequency is stable at 50Hz, the whole process is fast and smooth, the current has no overcurrent problem, and the voltage has no overvoltage problem.
  • the amplitude and phase control is adopted, and the traditional control strategy initialization method is used to connect to the grid, since the integrator is cleared, the AC outlet voltage amplitude and phase of the converter will be the same as the parallel one. If there is a large gap between the network points, it will cause system oscillation or even cause the system to collapse, making it difficult to realize grid connection.
  • the present invention can realize a good micro-grid grid connection process under the control of VSC amplitude and phase, which reflects the function of the present invention providing more application scenarios for power electronic equipment.
  • t 0 is the starting time of the control strategy
  • t 1 is a certain time when the control strategy is running normally
  • V dc is the DC voltage of the converter
  • Q s is the grid-side reactive power
  • i sd and i sq are the grid-side reactive power, respectively
  • V dcref is the DC voltage reference value
  • Q sref is the reactive power reference value
  • sdref is the d-axis current reference value
  • i sqref is the q-axis current reference value.
  • i sdref (t 0 ) and i sqref (t 0 ) can be directly measured, and U kd (t 0 ) and U kq (t 0 ) need to be calculated.
  • the calculation formula is:
  • P s is the active power on the grid side of the converter
  • U s is the rms value of the AC voltage on the grid side of the converter
  • U c is the rms value of the AC voltage at the PCC point
  • X c is the equivalent impedance of the commutation inductance
  • R is the commutation inductance. Current equivalent resistance.
  • the above two application embodiments are only examples and should not be used as limitations of the present invention.
  • the power electronic devices to which the present invention can be applied include but are not limited to the following devices shown in Table 1:

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Supply And Distribution Of Alternating Current (AREA)

Abstract

La présente invention concerne un procédé d'initialisation de commande de dispositif électronique de puissance, comprenant les étapes consistant à : (1) avant le démarrage d'une stratégie de commande cible, mesurer la quantité électrique à partir d'un système réel pour effectuer une acquisition d'état, collecter les données de quantité électrique en temps réel et obtenir des informations de valeur de réglage requises par une boucle de commande ; (2) en fonction des informations de valeur de réglage requises par la boucle de commande dans l'étape (1), régler une valeur initiale d'un intégrateur dans la boucle de commande et bloquer la valeur initiale de l'intégrateur avant le démarrage de la commande ; et (3) régler une valeur de référence de stratégie de commande cible en tant que valeur de mesure de quantité électrique obtenue à l'étape (1) ; et un système de commande envoie un signal de début de commande à une commande de modulation et de groupe de soupapes pour démarrer la stratégie de commande. Par réglage de la valeur initiale de l'intégrateur dans le système de commande et par commande d'une valeur de référence cible lorsque la stratégie de commande est initialisée, le procédé peut réduire l'impact du circuit, améliorer la rapidité et la stabilité avec lesquelles le dispositif électronique de puissance commande pendant le démarrage et fournir davantage de scénarios d'application pour le dispositif électronique de puissance. L'invention peut être largement appliquée dans le domaine de l'électronique de puissance.
PCT/CN2020/116987 2020-08-26 2020-09-23 Procédé d'initialisation de commande de dispositif électronique de puissance WO2022041363A1 (fr)

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