EP4162599A1 - Anordnung und verfahren zu dessen betrieb - Google Patents
Anordnung und verfahren zu dessen betriebInfo
- Publication number
- EP4162599A1 EP4162599A1 EP20754640.9A EP20754640A EP4162599A1 EP 4162599 A1 EP4162599 A1 EP 4162599A1 EP 20754640 A EP20754640 A EP 20754640A EP 4162599 A1 EP4162599 A1 EP 4162599A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- converter
- voltage
- sub
- soll
- modules
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- 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
- H02M7/483—Converters with outputs that each can have more than two voltages levels
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—ELECTRIC POWER NETWORKS; 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 high-voltage DC [HVDC] links; Arrangements for transfer of electric power between generators and networks via HVDC links
-
- 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
- H02M7/483—Converters with outputs that each can have more than two voltages levels
- H02M7/4835—Converters with outputs that each can have more than two voltages levels comprising two or more cells, each including a switchable capacitor, the capacitors having a nominal charge voltage which corresponds to a given fraction of the input voltage, and the capacitors being selectively connected in series to determine the instantaneous output voltage
-
- 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
- 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
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0006—Arrangements for supplying an adequate voltage to the control circuit of converters
-
- 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 arrangements with converters and methods for their operation.
- an electrical converter in the form of a multilevel converter which has an at least two-phase AC voltage side with at least two AC voltage connections, a DC voltage side and modular devices comprises, each having a series circuit with at least two sub-modules electrically connected in series.
- the sub-modules each comprise an energy store and at least two switching elements, of which at least one switching element is switched on when the sub-module is switched on or off and all switching elements are switched off in the blocked operating state.
- a multilevel converter with a different type of sub-modules is known from the international publication WO 2015/036149 A1.
- Converters of the type described can be connected to form arrangements comprising a first converter and a second converter, each having a DC voltage side.
- the DC voltage sides can each be connected to one another and to a common reference potential with one connection and each form a DC voltage connection of a common common DC voltage system with the other connection.
- the object of the invention is to specify an arrangement with converters which enables the converter to be operated in a particularly advantageous manner.
- the module devices each have a module control device for controlling the sub-modules of their respective module device
- the converters each have a central device that is designed to provide the module control devices of the module devices of their own converter with at least one voltage specification that affects switched-off sub-modules , to transmit stuffs and to transmit at least one value to the central device of the other converter in each case, the converter-related voltage specification depending on at least one value that the respective central device receives from the central device of the other converter in each case, and the module devices are each designed for this are to meet the voltage specification of their central facility, or at least approximately to meet them, by switching none, one or more of their sub-modules to the switched-off operating state.
- a major advantage of the arrangement according to the invention is that due to the exchange of values between the converters provided according to the invention and the determination of voltage specifications that relate to switched-off sub-modules, both symmetrical operation, for example when precharging the converter after commissioning, is relatively to each other as well as a symmetrical operation can be achieved relative to the common reference potential. DC currents via the reference potential can be avoided or at least reduced.
- the sub-modules preferably each have a sub-module control device.
- the sub-module control devices preferably determine the operating state of their sub-modules by controlling the switching elements.
- the converters after commissioning, in which all sub-modules are initially in the blocked operating state and the sub-module control devices are not yet capable of communication due to the lack of sufficient charge of their assigned energy storage devices, are first switched to charging mode, and the sub-module control devices each with it their assigned Modul Wennein device communicate as soon as they have become capable of communication during charging, and the central devices gene the module control devices of their converter at least during charging the voltage specification, which relates to switched sub-modules, transmit.
- the converters first switch to a charging mode that includes at least a first and a two te charging phase includes, are shifted, and the central devices transmit the voltage specification, which relates to switched-off sub-modules, to the module control devices of their converter at least in the second charging phase of the charging operation.
- the converters can make a transition from the first charging phase to the second charging phase in each of the module devices, even if not all sub-modules of the module device in question are capable of communication and therefore cannot yet be controlled.
- the module devices can advantageously already be transferred to an optimized charging mode in the second charging phase, in which some of the sub-modules whose energy stores are at least for a communication drive are already sufficiently charged, continue to be charged in a targeted manner and others are specifically excluded from further charging.
- This procedure makes it possible, for example, for some of the sub-modules to have much higher charging voltages than others or the average of the sub-modules at the time when all sub-modules of all modular devices are capable of communication and can therefore be controlled.
- a further advantage of the last-mentioned embodiment can be seen in the fact that by specifying the voltage specification, asymmetries between the charging states of the module devices are minimized in a targeted manner or their occurrence can be prevented or at least prevented as best as possible; For example, if the first voltage specification is selected to be greater for one of the module devices than for another module device, the total voltage of the partial module voltages in the first-mentioned module device will rise less quickly than in the second-mentioned module device, and vice versa.
- the specified voltage threshold is dimensioned in such a way that it is reached or exceeded even if not all sub-modules of the respective module device are capable of communication.
- the module control devices are preferably designed to transmit voltage values transmitted by the sub-module control devices or sum values derived therefrom to the higher-level central device of their converter.
- the central devices are preferably designed to switch over those of their module control devices in which the sum of the transmitted voltage values or the transmitted total value reaches or exceeds a predetermined voltage threshold from the first to the second charging phase of the charging operation by providing these module control devices with the voltage specification, which relates to switched off sub-modules.
- the voltage specification for the first and second converters is preferably changed in each case until the difference value, which indicates the difference between the operating points of the converters, is zero or falls below a predetermined limit.
- the voltage specification for the first and/or second converter preferably depends on a voltage difference between a first partial voltage, which is present between the two connections on the DC voltage side of the first converter, and a second partial voltage, which is present between the two connections on the DC voltage side of the second converter applied, from.
- the voltage specification for the first converter is increased when the first partial voltage is greater than the second partial voltage, and reduced when the second partial voltage is greater than the first partial voltage, and/or the voltage specification for the second converter is reduced is decorated when the first partial voltage is greater than the second partial voltage, and is increased when the second partial voltage is greater than the first partial voltage.
- the voltage specification for the first and/or second converter can advantageously depend on the energy difference between the energy stored in the energy stores of the first converter and the energy stored in the energy stores of the second converter.
- the voltage specification for the first and/or second converter depends on the energy difference between a first mean value, which is formed by averaging the energies stored in the module devices of the first converter, and a second mean value, which is formed by averaging the energies stored in the module devices of the second converter are formed.
- the voltage specification for the first converter depends on the level of an energy difference between the energy stored in the energy stores of the first converter and the energy stored in the energy stores of the second converter, specifically is increased when a first energy value indicating the energy stored in the first converter is greater than a second energy value indicating the energy stored in the second converter, and is reduced when the second energy value is greater than the first energy value, and/or the voltage specification for the second converter is increased when the second energy value is greater than the first energy value and decreased when the first energy value is greater than the second energy value.
- the charging operation is preferably carried out from the common DC voltage system, and the voltage specifications for the first converter and the second converter are preferably determined according to:
- Uout,soll2 f(Udc, Uac2, Ufinal,soll, t, kp, El, E2,
- Vac1 designates the AC voltage present on the AC voltage side of the first converter and Vac2 the AC voltage present on the AC voltage side of the second converter.
- Uout,setpoint denotes the voltage specification for the first converter and Uout,setpoint2 the voltage specification for the second converter.
- Ufinal,soll designates the target voltage sum from the sub-module voltages of the module devices present at the energy stores of the sub-modules after the end of the charging phase and at the beginning of normal operation for both converters, from the operating point of the two to be set converter at the start of normal operation
- kp designates an adjustable amplification factor
- El an energy value which specifies the energy stored in the energy stores of the first converter
- E2 an energy value which specifies the energy stored in the energy stores of the second converter
- f designates a function that increases over time t, preferably in steps or ramps, from zero to a respective maximum value
- Uout,set,max2 Ufinal,set - 0.25*Udc-0.5Uac2 + kp(E2-El) increases.
- the invention also relates to a converter, in particular for an arrangement as described above, the converter having a DC voltage side and comprising modules that each have a series connection with at least two sub-modules electrically connected in series, and each sub-module has an energy store and at least two switching elements, of which at least one switching element is switched on when the partial module is switched on or switched off, and all switching elements are switched off in the blocked operating state.
- the module devices each have a module control device for controlling the sub-modules of their respective module device
- the converter has a central device that is designed to transmit at least one voltage specification, which relates to switched-off sub-modules, to the module control devices of its own module devices and to transmit at least one value to a central facility of another converter, with the converter-related voltage specification depending on at least one value that the respective central facility receives from the central facility of the other converter, and the module facilities are each equipped for this are formed to meet the voltage specification of their central facility, or at least approximately to meet them, by putting none, one or more of their sub-modules into the switched-off operating state.
- the invention also relates to a central device for a converter as described above and for an arrangement as described above.
- the central device is designed to transmit at least one voltage specification, which relates to switched-off sub-modules, to module control devices assigned to module devices and to transmit at least one value to a central device of another converter, the converter-related voltage specification having at least one value depends, which the respective central facility receives from the central facility of the other converter.
- the invention also relates to a Modulmatiein direction for a converter, as described above, or an arrangement as described above.
- the module control device is designed to transmit voltage values transmitted by sub-module control devices or sum values derived therefrom to a higher-level central device, and this is also designed to meet a voltage specification of the central device by switching at least one sub-module capable of communication into the switched-off operational state.
- the invention also relates to a method for operating an arrangement with a first converter and a second converter, each of which has a DC voltage side, with the two DC voltage sides being connected to one connection and to a common reference potential and to the other
- Each connection forms a DC voltage connection of a common community DC voltage system
- the converters each comprising module devices which each have a series circuit with at least two sub-modules electrically connected in series, and the sub-modules each comprise an energy store and at least two switching elements, one of which is switched on or switched off operating state of the sub-modules at least one switching element is switched on and in the blocked operating state all switching elements are switched off.
- the module devices each have a module control device that controls the sub-modules of their respective module device, a central device transmits at least one voltage specification, which relates to switched-off sub-modules, to the module control devices of the module devices of its own converter, and at least one value to the central device of the transmitted to the other converter in each case, with the converter-related voltage specification depending on at least one value that the respective central device receives from the central device of the other converter in each case, and the module devices meet the voltage specification of their central device or at least approximately meet it by not having one, one or more their sub-modules into the switched-off operating state.
- Figure 1 shows an embodiment of an inventive
- FIG. 2 shows an exemplary embodiment of a converter according to the invention, which can be used in the arrangement according to FIG.
- Figure 3 shows a first embodiment of a for
- FIG. 4 shows a second exemplary embodiment of a partial module suitable for the converter according to FIG. 2,
- Figure 5 shows an embodiment of a Modul Strukturein direction
- FIG. 6 shows an exemplary embodiment of a central device according to the invention.
- FIG. 1 shows an arrangement 400, which includes a first converter 401 and a second converter 402 and is designed in what is known as a “bipole rigid” topology.
- Each of the two converters 401 and 402 has a first connection side and a second connection side.
- the first two connection sides are each three-phase AC voltage sides 11, which have three AC voltage connections WS1-WS3.
- the two second connection sides are DC voltage sides 12, one connection of which is connected to one another and via an impedance Z to a common reference potential BP, and the other connection forms a DC voltage connection 411 and 412 of a common common DC voltage system 410.
- the reference potential BP is ground potential
- the impedance Z is a ground impedance.
- the line system 420 for the two DC voltage connections 411 and 412 is shown in FIG. 1 in a greatly simplified form in the form of two equivalent capacitors Cdc.
- the purpose of the mode of operation of the converters 401 and 402 described below is to avoid an excessive potential shift at the ground connection during charging and thus to keep the current flow via the earth connection within small, defined limits.
- the charging operation preferably takes place in at least two charging phases.
- the converters 401 and 402 according to Figure 1 each have a central device ZE, which is designed to provide module devices ME1-ME6 of their own converter with a voltage specification Uout,setpoint or Uout,setpoint2, which switched off sub-modules TM (cf. Figure 2 ) relates to determining how to transmit at least one value W1 or W2 to the central device ZE of the other converter in each case.
- the module devices ME1-ME6 are each designed to meet or at least approximately meet the voltage specification Uout,setpoint or Uout,setpoint2 of their central device ZE by switching none, one or more of their submodules TM to the switched-off operating state.
- the values W1 and W2 received from the other converter allow each of the two converters 401 and 402 to change its voltage specification Uout,setpoint or Uout,setpoint2 in such a way that a difference value indicating the difference between the operating points of the converters 401 and 402 is zero amounts to or falls below a predetermined limit.
- the voltage specifications Uout,setpoint or Uout,setpoint2 for the converters 401 and 402 are based on a voltage difference between a first partial voltage Udcl, which is present between the two terminals of the DC voltage side 12 of the first converter 401, and a second partial voltage Udc2 which is between the two terminals of the DC voltage side 12 of the second converter 402 is applied depends.
- the voltage specification Uout,setpoint for the first converter 401 can be increased when the first partial voltage Udcl is greater than the second partial voltage Udc2, and reduced when the second partial voltage Udc2 is greater than the first partial voltage Udcl.
- the voltage specification Uout,setpoint2 for the second converter 401 and 402 can be reduced when the first partial voltage Udcl is greater than the second partial voltage Udc2, and increased when the second partial voltage Udc2 is greater than the first partial voltage Udcl.
- the values W1 and W2 exchanged between the converters 401 and 402 preferably also indicate at least the first partial voltage Udcl and the second partial voltage Udc2.
- the voltage specifications Uaus,soll and Uaus,soll2 for the first and second converter 401 and 402 are based on the energy difference between the energy stored in the energy stores ES (see FIGS. 2 to 6) of the first converter 401 and the energy stored in the energy store ES of the second converter 402 .
- the values W1 and W2, which are exchanged between the converters 401 and 402 preferably also indicate at least energy values which describe the energy stored in the energy stores ES.
- the voltage specification Uout,setpoint for the first converter 401 and the voltage specification Uout,setpoint2 for the second converter 402 can be based on the energy difference between a first mean value, which is formed by averaging the energies stored in the modules of the first converter 401, and a second mean value, which is formed by averaging the energies stored in the module devices of the second converter 402.
- the values W1 and W2 ranging between the converters 401 and 402 are exchanged, preferably at least also the average values described.
- the voltage specification Uout,soll for the first converter 401 depends on the level of an energy difference between the energy stored in the energy stores of the first converter 401 and the energy stored in the energy stores of the second converter 402, namely increased when a first energy value indicative of the energy stored in the first converter 401 is greater than a second energy value indicative of the energy stored in the second converter 402, and is reduced when the second energy value is greater than the first energy value.
- the voltage specification for the second converter 402 can be increased if the second energy value is greater than the first energy value and reduced if the first energy value is greater than the second energy value.
- the values W1 and W2 exchanged between the converters 401 and 402 preferably also indicate at least the described energy values.
- Uout,soll2 f(Udc, Uac2, Ufinal,soll, t, kp, El, E2,
- Uacl designates the AC voltage applied to the AC voltage side 11 of the first converter 401 (e.g. as amplitude or effective value of the phase-to-phase voltage) and Uac2 the AC voltage side 11 of the second converter ters 402 applied AC voltage (e.g. as amplitude or effective value of the phase-to-phase voltage).
- Ufinal,soll designates a target voltage sum from the sub-module voltages of the module devices present at the energy stores ES of the sub-modules TM (see Figures 2 to 6) after the end of the charging phase and at the beginning of normal operation for both converters 401 and 402, which range from the operating point to be set to the both converters 401 and 402 at the beginning of normal operation depends.
- kp is an adjustable gain factor.
- El designates an energy value, which is transmitted as value W1 to the second converter 402 and indicates the energy stored in the energy stores ES of the first converter 401 .
- E2 denotes an energy value, which is transmitted as value W2 to the first converter 401 and indicates the energy stored in the energy stores ES of the second converter 402.
- f is a function that increases over time t, preferably in steps or ramps, from Zero to a respective maximum value
- Uout,set,maxi Ufinal,set - 0.25*Udc-0.5Uacl + kp(El-E2)
- Uout,set,max2 Ufinal,set - 0.25*Udc-0.5Uac2 + kp(E2- El) increases.
- FIG. 2 shows an exemplary embodiment of a converter 10, which can be used as a first converter 401 and as a second converter 402 in the arrangement 400 according to FIG.
- the converter 10 is used as the converter 401 in the arrangement 400 according to FIG.
- the DC voltage side 12 has two DC voltage terminals G1 and G2.
- the DC voltage connection G1 at the top in FIG. 2 can form the DC voltage connection 411 of the common community DC voltage system 410 according to FIG.
- the lower in the figure 2 DC voltage terminal G2 can the impedance Z can be connected to the common reference potential BP according to FIG.
- the converter 10 includes six module devices ME-ME6, each of which has a series connection with two or more sub-modules TM electrically connected in series and a module control device MSE for controlling the sub-modules TM of the respective module device ME-ME6.
- the module control devices MSE are connected to a higher-level central device ZE of the converter 10 via communication lines, which are not shown in detail in FIG. 2 for reasons of clarity.
- the sub-modules TM each comprise a sub-module control unit TMSE, an energy store ES (see Figures 3 and 4) and at least two switching elements, of which at least one switching element is switched on both when the sub-module TM is switched on and when it is switched off and in the blocked operating state of the sub-module all switching elements are switched off.
- the sub-module control device TMSE determines the operating state of its sub-module TM by activating the switching elements.
- FIG. 3 shows an exemplary embodiment of a partial module TM in the form of what is known as a half-bridge module, which can be used in converter 10 according to FIG.
- the partial module TM according to FIG. 3 comprises two switching elements S1 and S2, each of which is formed by a transistor and a freewheeling diode connected in parallel, and an energy store ES in the form of a capacitor.
- FIG. 3 shows the submodule control device TMSE, which controls the two switching elements S1 and S2.
- FIG. 4 shows an exemplary embodiment of a partial module TM in the form of a so-called full-bridge module, which can be used in converter 10 according to FIG.
- the partial module TM comprises four switching elements S1 to S4, each of which is connected by a transistor and a parallel-connected release Running diode are formed, and an energy store ES in the form of a capacitor.
- FIG. 4 shows the submodule control device TMSE, which controls the four switching elements S1 to S4.
- the module control devices MSE in the converter 10 are suitable in normal operation to ensure a predetermined flow of energy between the two connection sides 11 and 12 of the converter 10 by activating the submodule control devices TMSE of their submodules TM.
- the sub-module control devices TMSE are not yet able to communicate due to a lack of sufficient charging status of their associated energy store ES; the sub-module control devices TMSE can also not yet activate their associated switching elements S1-S2 according to FIG. 3 or S1-S4 according to FIG. 4, which is why the switching elements are also still switched off.
- all sub-modules TM are initially in the blocked operating state because the energy stores ES are not yet sufficiently charged and therefore none of the switching elements can be switched on.
- the converter 10 After the converter 10 has been put into operation, it is first put into a charging mode that includes a first and a second charging phase.
- the charging operation can take place from the AC voltage side 11 or the DC voltage side 12 by applying an AC voltage to the AC voltage connections WS1-WS3 or a DC voltage to the DC voltage connections G1 and G2.
- the converter 10 is charged from the common DC voltage system 410 according to FIG. 1, ie on the DC voltage side 12.
- the sub-module control devices TMSE are able to communicate during the first charging phase, because their energy stores ES are sufficiently charged and can provide operating energy, they each begin to communicate with their assigned module control device MSE.
- the sub-module control devices TMSE each transmit voltage values U, which indicate the respective voltage at their energy store ES, to the module control device MSE that is higher than them.
- the index i identifies the assigned module device MEi, ie ME1-ME6, and thus its module control devices MSE. Since the converter 10 according to FIG. 2 has six module control devices MSE, six cumulative values Sul-Su6 are transmitted to the central device ZE.
- the central device ZE is designed to switch those module control devices MSE, in which the sum of the transmitted voltage values or the transmitted total value already reaches or exceeds a specified voltage threshold Smin, to the second charging phase of the charging operation by providing these module control devices MSE with a voltage specification Uout, is to, which relates to switched-off sub-modules TM, transmitted.
- the modular devices ME1-ME6 are each individually placed in the second charging phase as soon as they qualify for it.
- the voltage specification Uout should preferably define the total voltage that switched-off sub-modules should reach.
- the module devices ME1-ME6 are designed to meet the voltage specification Uout, set or at least as best as possible by putting none, one or more of their communication-capable sub-modules TM in the switched off th operating state and charging the energy storage cher ES, the are in the on and blocked operating state.
- the algorithm as to how the partial modules TM to be switched off are determined is arbitrary; the best possible fulfillment of the voltage specification of the central device ZE can be determined, for example, by a simulation in the sense of computer-assisted trying out all possible operating constellations of the communication-capable submodules TM and the subsequent selection of that operating constellation that guarantees the best possible fulfillment of the voltage specification.
- a brute force-like approach can be carried out without any problems.
- the specified voltage threshold Smin is dimensioned in such a way that it is reached or exceeded even if not all sub-modules TM of the respective modular device ME1- ME6 are capable of communication.
- the specified voltage threshold Smin is preferably dimensioned in such a way that it is reached or exceeded when a specified number, which is between 25% and 50%, of the sub-modules TM of the respective modular device ME1-ME6 carries, is able to communicate with sub-modules TM.
- the specified voltage threshold Smin can be between 25% and 50% of the total voltage to be expected in the event that all sub-modules TM of the respective modular device ME1-ME6 were capable of communication.
- the central device ZE determines the voltage specification Uout,soll as a function of the respective energy difference between the energy stored in the energy stores ES of its own converter 10 or the corresponding energy value El and the energy stored in the other converter 402 of the arrangement 400 according to FIG or the corresponding energy value E2, as explained above by way of example in connection with FIG.
- FIG. 5 shows an exemplary embodiment of a module control device MSE, which can be used in the converter 10 according to FIG.
- the module control device MSE includes a computing device 100 and a memory 110.
- a software program module SPM_mse is stored in the memory 110, which when executed by the computing device 100 causes the module control device MSE to operate as described above by way of example.
- FIG. 6 shows an exemplary embodiment of a central device ZE, which can be used in the converter 10 according to FIG.
- the central device ZE includes a computing device 200 and a memory 210.
- a software program module SPM_ze is stored in the memory 210, which when executed by the computing device 200 causes the central device ZE to operate as described above by way of example.
- the arrangement 400 described above by way of example and the converters 401 and 402 or their operating methods can have one or more of the properties or features listed below: -
- the operating method preferably comprises a two-stage pre-charging method, which is coordinated via two converters 401 and 402 connected in series.
- the operating method can be characterized in that partially active converters 401 and 402 can also be started up during the pre-charging.
- the operating method can be distinguished by the fact that to coordinate the second (active) charging phase, the average arm energy (module installation energy) or the average total voltage between the two DC voltage connections Gl and G2 of the converters 401 and 402 is exchanged.
- the operating method can be characterized in that, based on the difference in the mean module device energies of the module devices ME1-ME6 and/or the mean voltages between the two DC voltage connections Gl and G2 of the converters 401 and 402, the setpoint value for the DC charging voltage of the respective converter 401 and 402 is changed.
- the operating method can be used for both half- and full-bridge converters, especially multilevel converters (MMCs).
- MMCs multilevel converters
- the operating method allows the pre-charging of an HVDC station or its two converters while at the same time minimizing the energy input into the ground impedance Z. This allows optimization both with regard to the design and the costs in the ground connection.
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
Description
Claims
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/EP2020/070906 WO2022017618A1 (de) | 2020-07-24 | 2020-07-24 | Anordnung und verfahren zu dessen betrieb |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP4162599A1 true EP4162599A1 (de) | 2023-04-12 |
Family
ID=72050809
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP20754640.9A Pending EP4162599A1 (de) | 2020-07-24 | 2020-07-24 | Anordnung und verfahren zu dessen betrieb |
Country Status (2)
| Country | Link |
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| EP (1) | EP4162599A1 (de) |
| WO (1) | WO2022017618A1 (de) |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102013218207A1 (de) | 2013-09-11 | 2015-03-12 | Siemens Aktiengesellschaft | Modularer Mehrpunktstromrichter für hohe Spannungen |
| EP2897268B1 (de) * | 2014-01-20 | 2022-01-05 | ABB Schweiz AG | Master/slave regelungssystem in ringtopologie für modulare mehrpunktumrichter |
| CN105915038B (zh) * | 2016-04-08 | 2018-11-23 | 南京南瑞继保电气有限公司 | 一种电压源换流器过负荷限电流方法 |
| KR101840117B1 (ko) * | 2016-07-06 | 2018-03-19 | 명지대학교 산학협력단 | 송전 시스템에서 컨버터 선충전 방법 및 이를 위한 제어기 |
| CN108471251B (zh) * | 2018-04-27 | 2019-12-06 | 广州供电局有限公司 | 半桥与全桥混合的模块化多电平换流器的启动方法及装置 |
| US11404973B2 (en) * | 2018-12-19 | 2022-08-02 | Di Shi | Generalized equivalent circuit model of MMC-HVDC for power system simulation |
-
2020
- 2020-07-24 WO PCT/EP2020/070906 patent/WO2022017618A1/de not_active Ceased
- 2020-07-24 EP EP20754640.9A patent/EP4162599A1/de active Pending
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| Publication number | Publication date |
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| WO2022017618A1 (de) | 2022-01-27 |
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