Dynamic simulation method and device for converter station

Abstract

The invention provides a dynamic simulation method and device for a converter station. And respectively correcting the first analog impedance of the first conversion module and the second analog impedance of the second conversion module in the dynamic analog converter station, and carrying out dynamic simulation on the dynamic analog converter station according to the corrected first analog impedance and the corrected second analog impedance. The first simulation impedance and the second simulation impedance are combined, and the dynamic simulation precision can be improved. According to the method and the device, equivalence of step-by-step simulation impedance of the dynamic simulation converter station is realized, the dynamic simulation converter station is facilitated to reserve transient and steady state characteristics of an actual converter station, and accurate simulation of the dynamic simulation converter station on the actual converter station is realized more accurately. According to the dynamic simulation converter station, the simulation impedances of the first conversion module, the second conversion module and the filtering module in the dynamic simulation converter station are subjected to equivalence, and the complexity and difficulty of the dynamic simulation converter station can be reduced.

Description

Technical Field

[0001] The present application relates to the technical field of medium and high voltage direct current transmission, and in particular to a method and device for dynamic simulation of a converter station. Background Art

[0002] In the past decade, flexible direct current transmission technology based on modular multilevel converter (MMC) has developed rapidly, providing efficient technical support for the grid connection of offshore wind power and asynchronous interconnection of large power grids.

[0003] On the one hand, MMC is expensive because it includes a large number of fully controlled semiconductor devices. On the other hand, the semiconductor devices, capacitors, bypass switches, etc. in the power module of MMC need to be controlled and state-detected, which makes the circuit of the power module more complicated. Compared with the converter composed of uncontrolled semiconductor devices, semi-controlled semiconductor devices, and uncontrolled converters, the operating reliability of MMC is weaker.

[0004] At present, the converter stations in the high-voltage direct current transmission system usually adopt diode rectifier unit (DRU) and voltage source converter (VSC). Under the same capacity, the volume and weight are greatly reduced, and the cost can also be greatly reduced, which has obvious economic advantages.

[0005] In order to dynamically simulate the converter station, the relevant technology usually reduces the voltage, capacity and current in proportion, ignoring the equivalence of impedances such as filter modules and VSC in the converter station, resulting in low dynamic simulation accuracy. Summary of the invention

[0006] In order to solve the problem of low accuracy in the prior art, the present application provides a dynamic simulation method of a converter station, which may include:

[0007] The first simulated impedance of the first conversion module in the dynamic simulated converter station is corrected according to the first actual impedance of the first conversion module in the actual converter station.

[0008] The second simulated impedance of the second conversion module in the dynamic simulated converter station is corrected according to the second actual impedance of the second conversion module in the actual converter station.

[0009] The dynamic simulation converter station is dynamically simulated according to the corrected first simulation impedance and the corrected second simulation impedance.

[0010] In a possible implementation, the first simulated impedance of the first conversion module in the dynamic simulation converter station is corrected according to the first actual impedance of the first conversion module in the actual converter station, including:

[0011] Get the first actual impedance.

[0012] The first simulated impedance is determined according to the three-phase AC port current of the first conversion module in the dynamic simulation converter station and in combination with Ohm's law.

[0013] The first simulated impedance is corrected according to the first actual impedance, that is, the first simulated impedance is made as equal to the first actual impedance as possible, thereby obtaining the corrected first simulated impedance.

[0014] Optionally, the first simulated impedance satisfies:

[0015]

[0016] Among them, Z DRU Represents the first simulated impedance. DRUd represents the d-axis voltage component of the AC port voltage of the first conversion module in the dynamic simulation converter station after Clarke transformation, u DRUq It represents the q-axis voltage component of the AC port voltage of the first conversion module in the dynamic simulation converter station after Clark transformation. DRUd represents the d-axis current component of the AC port current of the first conversion module in the dynamic simulation converter station after Clarke transformation, i DRUq It represents the q-axis current component of the AC port current of the first conversion module in the dynamic simulation converter station after Clark transformation.

[0017] In another possible implementation, the second simulated impedance of the second conversion module in the dynamic simulation converter station is corrected according to the second actual impedance of the second conversion module in the actual converter station, including:

[0018] The second actual impedance is obtained.

[0019] The second simulated impedance is determined according to the three-phase AC port current of the second conversion module in the dynamic simulation converter station and in combination with Ohm's law.

[0020] The second simulated impedance is corrected according to the second actual impedance, that is, the second simulated impedance is made as equal to the second actual impedance as possible, to obtain a corrected second simulated impedance.

[0021] Optionally, the second simulated impedance satisfies:

[0022]

[0023] Among them, Z VSC Represents the second simulated impedance. VSCd represents the d-axis voltage component of the AC port voltage of the second conversion module in the dynamic simulation converter station after Clarke transformation, u RVSCqIt represents the q-axis voltage component of the AC port voltage of the second conversion module in the dynamic simulation converter station after Clark transformation. VSCd represents the d-axis current component of the AC port current of the second conversion module in the dynamic simulation converter station after Clarke transformation, i VSCq It represents the q-axis current component of the AC port current of the second conversion module in the dynamic simulation converter station after Clarke transformation.

[0024] In another possible implementation, dynamically simulating the dynamic simulated converter station according to the corrected first simulated impedance and the modified second simulated impedance includes:

[0025] The third simulated impedance of the filter module in the dynamic simulated converter station is corrected according to the third actual impedance of the filter module in the actual converter station.

[0026] The simulated impedance of the dynamic simulated converter station is determined according to the corrected third simulated impedance, the corrected first simulated impedance and the modified second simulated impedance, combined with the connection relationship between the first conversion module and the second conversion module in the dynamic simulated converter station.

[0027] Furthermore, the third simulated impedance of the filter module in the dynamic simulated converter station is corrected according to the third actual impedance of the filter module in the actual converter station, including:

[0028] Obtain the third actual impedance.

[0029] The third simulated impedance is determined according to the three-phase AC port current of the filter module in the dynamic simulation converter station and in combination with Ohm's law.

[0030] The third simulated impedance is corrected according to the third actual impedance, that is, the third simulated impedance is made as equal to the third actual impedance as possible, to obtain a corrected third simulated impedance.

[0031] Optionally, the third simulated impedance satisfies:

[0032]

[0033] Among them, Z RLC Represents the third simulated impedance. RLCd represents the d-axis voltage component of the AC port voltage of the filter module in the dynamic simulation converter station after Clarke transformation, u RLCq It represents the q-axis voltage component of the AC port voltage of the filter module in the dynamic simulation converter station after Clark transformation. RLCd represents the d-axis current component of the AC port current of the filter module in the dynamic simulation converter station after Clarke transformation, i RLCq It represents the q-axis current component of the AC port current of the filter module in the dynamic simulation converter station after Clarke transformation.

[0034] Exemplarily, when the first conversion module and the second conversion module are connected in series in the dynamic simulation converter station, the simulated impedance of the dynamic simulation converter station satisfies:

[0035]

[0036] When the first conversion module and the second conversion module are connected in parallel in the dynamic simulation converter station, the simulated impedance of the dynamic simulation converter station satisfies:

[0037]

[0038] Where Z represents the simulated impedance of the dynamic simulated converter station, Z DRU represents the first simulated impedance, Z VSC represents the second simulated impedance, Z RLC represents the third simulated impedance.

[0039] In a second aspect, the present application provides a dynamic simulation device for a converter station, comprising:

[0040] The first correction module is used to correct the first simulated impedance of the first conversion module in the dynamic simulation converter station according to the first actual impedance of the first conversion module in the actual converter station.

[0041] The second correction module is used to correct the second simulated impedance of the second conversion module in the dynamic simulation converter station according to the second actual impedance of the second conversion module in the actual converter station.

[0042] The dynamic simulation module is used to dynamically simulate the dynamic simulation converter station according to the corrected first simulation impedance and the corrected second simulation impedance.

[0043] In a possible implementation manner, the first correction module is specifically used to:

[0044] Get the first actual impedance.

[0045] The first simulated impedance is determined according to the three-phase AC port current of the first conversion module in the dynamic simulation converter station and in combination with Ohm's law.

[0046] The first simulated impedance is corrected according to the first actual impedance, that is, the first simulated impedance is made as equal to the first actual impedance as possible, to obtain a corrected first simulated impedance.

[0047] Optionally, the first correction module calculates the first simulated impedance according to the following formula:

[0048]

[0049] Among them, Z DRU Represents the first simulated impedance.DRUd represents the d-axis voltage component of the AC port voltage of the first conversion module in the dynamic simulation converter station after Clarke transformation, u DRUq It represents the q-axis voltage component of the AC port voltage of the first conversion module in the dynamic simulation converter station after Clark transformation. DRUd represents the d-axis current component of the AC port current of the first conversion module in the dynamic simulation converter station after Clarke transformation, i DRUq It represents the q-axis current component of the AC port current of the first conversion module in the dynamic simulation converter station after Clark transformation.

[0050] In another possible implementation, the second correction module is specifically configured to:

[0051] The second actual impedance is obtained.

[0052] The second simulated impedance is determined according to the three-phase AC port current of the second conversion module in the dynamic simulation converter station and in combination with Ohm's law.

[0053] The second simulated impedance is corrected according to the second actual impedance, that is, the second simulated impedance is made as equal to the second actual impedance as possible, to obtain a corrected second simulated impedance.

[0054] Optionally, the second correction module calculates the second simulated impedance according to the following formula:

[0055]

[0056] Among them, Z VSC Represents the second simulated impedance. VSCd represents the d-axis voltage component of the AC port voltage of the second conversion module in the dynamic simulation converter station after Clarke transformation, u RVSCq It represents the q-axis voltage component of the AC port voltage of the second conversion module in the dynamic simulation converter station after Clark transformation. VSCd represents the d-axis current component of the AC port current of the second conversion module in the dynamic simulation converter station after Clarke transformation, i VSCq It represents the q-axis current component of the AC port current of the second conversion module in the dynamic simulation converter station after Clarke transformation.

[0057] In yet another possible implementation, the dynamic simulation module is specifically used to:

[0058] The third simulated impedance of the filter module in the dynamic simulated converter station is corrected according to the third actual impedance of the filter module in the actual converter station.

[0059] The simulated impedance of the dynamic simulated converter station is determined according to the corrected third simulated impedance, the corrected first simulated impedance and the modified second simulated impedance, combined with the connection relationship between the first conversion module and the second conversion module in the dynamic simulated converter station.

[0060] Furthermore, the dynamic simulation module is specifically used for:

[0061] Obtain the third actual impedance.

[0062] The third simulated impedance is determined according to the three-phase AC port current of the filter module in the dynamic simulation converter station and in combination with Ohm's law.

[0063] The third simulated impedance is corrected according to the third actual impedance, that is, the third simulated impedance is made as equal to the third actual impedance as possible, to obtain a corrected third simulated impedance.

[0064] Optionally, the dynamic simulation module calculates the third simulation impedance according to the following formula:

[0065]

[0066] Among them, Z RLC Represents the third simulated impedance. RLCd represents the d-axis voltage component of the AC port voltage of the filter module in the dynamic simulation converter station after Clarke transformation, u RLCq It represents the q-axis voltage component of the AC port voltage of the filter module in the dynamic simulation converter station after Clark transformation. RLCd represents the d-axis current component of the AC port current of the filter module in the dynamic simulation converter station after Clarke transformation, i RLCq It represents the q-axis current component of the AC port current of the filter module in the dynamic simulation converter station after Clarke transformation.

[0067] Exemplarily, when the first conversion module and the second conversion module are connected in series in the dynamic simulation converter station, the dynamic simulation device calculates the simulated impedance of the dynamic simulation converter station according to the following formula:

[0068]

[0069] When the first conversion module and the second conversion module are connected in parallel in the dynamic simulation converter station, the dynamic simulation device calculates the simulated impedance of the dynamic simulation converter station according to the following formula:

[0070]

[0071] Where Z represents the simulated impedance of the dynamic simulated converter station, Z DRU represents the first simulated impedance, Z VSC represents the second simulated impedance, Z RLCrepresents the third simulated impedance.

[0072] On the other hand, the present application also provides a computer device, including: one or more processors.

[0073] A processor is used to execute one or more programs.

[0074] When one or more programs are executed by one or more processors, the dynamic simulation method as described above is implemented.

[0075] In another aspect, the present application further provides a computer-readable storage medium having a computer program stored thereon. When the computer program is executed, the above-mentioned dynamic simulation method is implemented.

[0076] Compared with the prior art, the beneficial effects of this application are:

[0077] In the dynamic simulation method of the converter station provided in the present application, the first simulated impedance of the first conversion module in the dynamic simulation converter station is corrected according to the first actual impedance of the first conversion module in the actual converter station, and the second simulated impedance of the second conversion module in the dynamic simulation converter station is corrected according to the second actual impedance of the second conversion module in the actual converter station, and the dynamic simulation converter station is dynamically simulated according to the corrected first simulated impedance and the corrected second simulated impedance. It can be seen that the present application not only considers the first simulated impedance of the first conversion module in the dynamic simulation converter station, but also considers the second simulated impedance of the second conversion module in the dynamic simulation converter station, that is, the first simulated impedance and the second simulated impedance are combined to improve the accuracy of dynamic simulation.

[0078] The present application realizes the equivalence of the step-by-step simulated impedance of the dynamic simulated converter station based on the first simulated impedance, the second simulated impedance and the third simulated impedance, which is beneficial for the dynamic simulated converter station to retain the transient and steady-state characteristics of the actual converter station, so as to more accurately realize the precise simulation of the actual converter station by the dynamic simulated converter station.

[0079] The present application performs equivalent simulation impedances of the first conversion module, the second conversion module and the filter module in the dynamic simulation converter station, respectively, which can reduce the complexity and difficulty of the dynamic simulation converter station. BRIEF DESCRIPTION OF THE DRAWINGS

[0080] In order to more clearly illustrate the technical solutions in the present application or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0081] Figure 1is a schematic structural diagram of a converter station in an embodiment of the present application;

[0082] Figure 2 Another schematic structural diagram of a converter station in an embodiment of the present application;

[0083] Figure 3 Schematic diagram of the structure of a diode rectifier in an embodiment of the present application.

[0084] Figure 4 A schematic flow chart of a dynamic simulation method of a converter station in an embodiment of the present application;

[0085] Figure 5 It is a schematic structural diagram of a dynamic simulation device of a converter station in an embodiment of the present application. DETAILED DESCRIPTION

[0086] The technical solution in this application will be described below in conjunction with the accompanying drawings.

[0087] The terms "first", "second", etc. in the specification embodiments, claims, and drawings of the present application are only used for the purpose of distinguishing descriptions, and cannot be understood as indicating or implying relative importance, nor can they be understood as indicating or implying order. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, including a series of steps or units. The method, system, product, or device is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products, or devices.

[0088] It should be understood that in the present application, "at least one (item)" means one or more, and "plurality" means two or more. "And / or" is used to describe the association relationship of associated objects, indicating that three relationships may exist. For example, "A and / or B" can mean: only A exists, only B exists, and A and B exist at the same time, where A and B can be singular or plural. The character " / " generally indicates that the objects associated before and after are in an "or" relationship. "At least one of the following" or similar expressions refers to any combination of these items, including any combination of single or plural items. For example, at least one of a, b or c can mean: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, c can be single or multiple.

[0089] Embodiment 1:

[0090] The embodiment of the present application provides a dynamic simulation method for a converter station. The embodiment of the present application takes the converter station as the sending end as an example. Figure 1 and Figure 2As shown, the converter station 10 can be connected to the AC power grid S through a common connection point (Point of Common Coupling, PCC). The converter station 10 may include a transformer T1, a capacitor C1 and an inductor L1. The converter station 10 may include a first conversion module 11, a second conversion module 12 and a filter module 13. Among them, the first conversion module 11 may include two rectifiers, and both rectifiers may be diode rectifier units (DRU). That is, the first conversion module 11 includes DRU1 and DRU2. The second conversion module 12 may be a voltage source converter (voltage source converter, VSC). The first conversion module 11 is connected to the filter module 13 through a transformer T2.

[0091] Figure 1 In the embodiment, the first conversion module 11 can be connected in series with the second conversion module 12 via an inductor Ldc. Figure 2 In the embodiment, the first conversion module 11 can be connected in parallel with the second conversion module 12 via the inductor Ldc.

[0092] The filter module 13 may include a capacitor filter 131, a high-pass filter 132 and a double-tone filter 133. Among them, the capacitor filter 131 may include a capacitor C4. The high-pass filter 132 may include a capacitor Chp, a resistor Rhp and an inductor Lhp. After the resistor Rhp and the inductor Lhp are connected in parallel, they are connected in series with the capacitor Chp. The double-tone filter 133 may include a capacitor C2, an inductor L2, a capacitor C3, a resistor R3 and an inductor L3. After the capacitor C3, the resistor R3 and the inductor L3 are connected in parallel, they are connected in series with the capacitor C2 and the inductor L2.

[0093] In the embodiment of the present application, the DRU may be as follows: Figure 3 The six-pulse rectifier shown in FIG. 6 may include a diode D1, a diode D2, a diode D3, a diode D4, a diode D5, a diode D6, an inductor L3, an inductor L4 and an inductor L5. The voltage balancing circuit for balancing the diodes of the bridge arm in the six-pulse rectifier may include only a static voltage balancing circuit, or only a dynamic voltage balancing circuit, and may also include a static voltage balancing circuit and a dynamic voltage balancing circuit.

[0094] Optionally, the first conversion modules 11 of pulsating rectifiers having a multiple of 12, such as 12 or 24, may be connected in series or in parallel to reduce harmonics at the common connection point.

[0095] like Figure 4 As shown, the dynamic simulation method 100 includes the following steps:

[0096] Step S1: correcting the first simulated impedance of the first conversion module in the dynamic simulated converter station according to the first actual impedance of the first conversion module in the actual converter station.

[0097] Step S2: correcting the second simulated impedance of the second conversion module in the dynamic simulated converter station according to the second actual impedance of the second conversion module in the actual converter station.

[0098] Step S3: Perform dynamic simulation on the dynamic simulation converter station according to the corrected first simulation impedance and the corrected second simulation impedance.

[0099] In a possible implementation, in step S1, the first simulated impedance of the first conversion module in the dynamic simulation converter station is corrected according to the first actual impedance of the first conversion module in the actual converter station, including:

[0100] Obtain the first actual impedance (which can be represented by Z1).

[0101] According to the three-phase AC port current of the first conversion module in the dynamic simulation converter station, the first simulation impedance Z is determined in combination with Ohm's law. DRU .

[0102] According to the first actual impedance Z1, the first simulated impedance Z DRU Correction is made, that is, the first simulated impedance Z DRU It is made as equal to the first actual impedance Z1 as possible to obtain a corrected first simulated impedance (which can be represented by Z2).

[0103] Optionally, the first simulated impedance Z DRU satisfy:

[0104]

[0105] Among them, Z DRU Y represents the first simulated impedance. DRUdd Y represents the d-axis self-impedance of the AC port impedance of the first conversion module in the dynamic simulation converter station after Clarke transformation, DRUqq It represents the q-axis self-impedance of the AC port impedance of the first conversion module in the dynamic simulation converter station after Clarke transformation (i.e. Clack transformation).

[0106] Y DRUdq , Y DRUqd It represents the dq axis mutual impedance of the AC port impedance of the first conversion module in the dynamic simulation converter station after Clarke transformation. DRUd represents the d-axis voltage component of the AC port voltage of the first conversion module in the dynamic simulation converter station after Clarke transformation, u DRUqIt represents the q-axis voltage component of the AC port voltage of the first conversion module in the dynamic simulation converter station after Clark transformation. DRUd represents the d-axis current component of the AC port current of the first conversion module in the dynamic simulation converter station after Clarke transformation, i DRUq It represents the q-axis current component of the AC port current of the first conversion module in the dynamic simulation converter station after Clark transformation.

[0107] In another possible implementation, in step S2, the second simulated impedance of the second conversion module in the dynamic simulation converter station is corrected according to the second actual impedance of the second conversion module in the actual converter station, including:

[0108] Obtain the second actual impedance (which can be represented by Z3).

[0109] According to the three-phase AC port current of the second conversion module in the dynamic simulation converter station, the second simulation impedance Z is determined in combination with Ohm's law. VSC .

[0110] The second simulated impedance Z is calculated based on the second actual impedance Z3. VSC Correction is made, that is, the second simulated impedance Z VSC It is made as equal to the second actual impedance Z3 as possible to obtain a corrected second simulated impedance (which can be represented by Z4).

[0111] Optionally, a second simulated impedance Z VSC satisfy:

[0112]

[0113] Among them, Z VSC Y represents the second simulated impedance. VSCdd represents the d-axis self-impedance of the AC port impedance of the second conversion module in the dynamic simulation converter station after Clark transformation, Y VSCqq Y represents the q-axis self-impedance of the AC port impedance of the second conversion module in the dynamic simulation converter station after Clark transformation. VSCdq , Y VSCqd It represents the dq axis mutual impedance of the AC port impedance of the second conversion module in the dynamic simulation converter station after Clarke transformation. VSCd represents the d-axis voltage component of the AC port voltage of the second conversion module in the dynamic simulation converter station after Clarke transformation, u RVSCq It represents the q-axis voltage component of the AC port voltage of the second conversion module in the dynamic simulation converter station after Clark transformation. VSCd represents the d-axis current component of the AC port current of the second conversion module in the dynamic simulation converter station after Clarke transformation, i VSCqIt represents the q-axis current component of the AC port current of the second conversion module in the dynamic simulation converter station after Clarke transformation.

[0114] In another possible implementation, in step S3, dynamically simulating the dynamic simulated converter station according to the corrected first simulated impedance and the modified second simulated impedance includes:

[0115] The third simulated impedance of the filter module in the dynamic simulated converter station is corrected according to the third actual impedance of the filter module in the actual converter station.

[0116] According to the corrected third simulated impedance (which can be represented by Z6), the corrected first simulated impedance Z2 and the modified second simulated impedance Z4, combined with the connection relationship between the first conversion module and the second conversion module in the dynamic simulated converter station, the simulated impedance (which can be represented by Z) of the dynamic simulated converter station is determined.

[0117] Furthermore, the third simulated impedance of the filter module in the dynamic simulated converter station is corrected according to the third actual impedance of the filter module in the actual converter station, including:

[0118] Obtain the third actual impedance (which can be represented by Z5).

[0119] According to the dynamic simulation of the three-phase AC port current of the filter module in the converter station, the third simulation impedance Z is determined in combination with Ohm's law. RLC .

[0120] According to the third actual impedance Z5, the third simulated impedance Z RLC Correction is made, that is, the third simulated impedance Z RLC The third simulated impedance Z6 is obtained by making it as equal to the third actual impedance Z5 as possible.

[0121] Optionally, a third simulated impedance Z RLC satisfy:

[0122]

[0123] Among them, Z RLC Y represents the third simulated impedance. RLCdd represents the d-axis self-impedance of the AC port impedance of the filter module in the dynamic simulation converter station after Clark transformation, Y RLCqq It represents the q-axis self-impedance after Clark transformation of the AC port impedance of the filter module in the dynamic simulation converter station. RLCdq , Y RLCqd It represents the dq axis mutual impedance of the AC port impedance of the filter module in the dynamic simulation converter station after Clarke transformation. RLCd represents the d-axis voltage component of the AC port voltage of the filter module in the dynamic simulation converter station after Clarke transformation, uRLCq It represents the q-axis voltage component of the AC port voltage of the filter module in the dynamic simulation converter station after Clark transformation. RLCd represents the d-axis current component of the AC port current of the filter module in the dynamic simulation converter station after Clarke transformation, i RLCq It represents the q-axis current component of the AC port current of the filter module in the dynamic simulation converter station after Clarke transformation.

[0124] Exemplarily, when the first conversion module and the second conversion module are connected in series in the dynamic simulation converter station, the simulated impedance Z of the dynamic simulation converter station satisfies:

[0125]

[0126] When the first conversion module and the second conversion module are connected in parallel in the dynamic simulation converter station, the simulated impedance Z of the dynamic simulation converter station satisfies:

[0127]

[0128] Where Z represents the simulated impedance of the dynamic simulated converter station, Z DRU represents the first simulated impedance, Z VSC represents the second simulated impedance, Z RLC represents the third simulated impedance.

[0129] Embodiment 2:

[0130] Based on the same inventive concept, the embodiment of the present application also provides a dynamic simulation device for a converter station. Figure 1 and Figure 2 And the above related content. Figure 5 As shown, the dynamic simulation device 200 includes:

[0131] The first correction module 21 is used to correct the first simulated impedance of the first conversion module in the dynamic simulation converter station according to the first actual impedance of the first conversion module in the actual converter station.

[0132] The second correction module 22 is used to correct the second simulated impedance of the second conversion module in the dynamic simulation converter station according to the second actual impedance of the second conversion module in the actual converter station.

[0133] The dynamic simulation module 23 is used to dynamically simulate the dynamic simulation converter station according to the corrected first simulation impedance (which can be represented by Z2) and the corrected second simulation impedance (which can be represented by Z4).

[0134] In a possible implementation, the first correction module 21 is specifically configured to:

[0135] Obtain the first actual impedance (which can be represented by Z1).

[0136] According to the three-phase AC port current of the first conversion module in the dynamic simulation converter station, the first simulation impedance Z is determined in combination with Ohm's law. DRU .

[0137] According to the first actual impedance Z1, the first simulated impedance Z DRU Correction is made, that is, the first simulated impedance Z DRU The first simulated impedance Z2 is obtained by making it as equal to the first actual impedance Z1 as possible.

[0138] Optionally, the first correction module 21 calculates the first simulated impedance Z as follows: DRU :

[0139]

[0140] Among them, Z DRU Y represents the first simulated impedance. DRUdd Y represents the d-axis self-impedance of the AC port impedance of the first conversion module in the dynamic simulation converter station after Clarke transformation (i.e., Clack transformation), DRUqq Y represents the q-axis self-impedance of the AC port impedance of the first conversion module in the dynamic simulation converter station after Clark transformation. DRUdq , Y DRUqd It represents the dq axis mutual impedance of the AC port impedance of the first conversion module in the dynamic simulation converter station after Clarke transformation. DRUd represents the d-axis voltage component of the AC port voltage of the first conversion module in the dynamic simulation converter station after Clarke transformation, u DRUq It represents the q-axis voltage component of the AC port voltage of the first conversion module in the dynamic simulation converter station after Clark transformation. DRUd represents the d-axis current component of the AC port current of the first conversion module in the dynamic simulation converter station after Clarke transformation, i DRUq It represents the q-axis current component of the AC port current of the first conversion module in the dynamic simulation converter station after Clark transformation.

[0141] In another possible implementation, the second correction module 22 is specifically configured to:

[0142] Obtain the second actual impedance (which can be represented by Z3).

[0143] According to the three-phase AC port current of the second conversion module in the dynamic simulation converter station, the second simulation impedance Z is determined in combination with Ohm's law. VSC .

[0144] The second simulated impedance Z is calculated based on the second actual impedance Z3. VSCCorrection is made, that is, the second simulated impedance Z VSC It is made as equal to the second actual impedance Z3 as possible to obtain a corrected second simulated impedance (which can be represented by Z4).

[0145] Optionally, the second correction module 22 calculates the second simulated impedance Z as follows: VSC :

[0146]

[0147] Among them, Z VSC Y represents the second simulated impedance. VSCdd represents the d-axis self-impedance of the AC port impedance of the second conversion module in the dynamic simulation converter station after Clark transformation, Y VSCqq Y represents the q-axis self-impedance of the AC port impedance of the second conversion module in the dynamic simulation converter station after Clark transformation. VSCdq , Y VSCqd It represents the dq axis mutual impedance of the AC port impedance of the second conversion module in the dynamic simulation converter station after Clarke transformation. VSCd represents the d-axis voltage component of the AC port voltage of the second conversion module in the dynamic simulation converter station after Clarke transformation, u RVSCq It represents the q-axis voltage component of the AC port voltage of the second conversion module in the dynamic simulation converter station after Clark transformation. VSCd represents the d-axis current component of the AC port current of the second conversion module in the dynamic simulation converter station after Clarke transformation, i VSCq It represents the q-axis current component of the AC port current of the second conversion module in the dynamic simulation converter station after Clarke transformation.

[0148] In another possible implementation, the dynamic simulation module 23 is specifically used for:

[0149] The third simulated impedance of the filter module in the dynamic simulated converter station is corrected according to the third actual impedance of the filter module in the actual converter station.

[0150] According to the corrected third simulated impedance (which can be represented by Z6), the corrected first simulated impedance Z2 and the modified second simulated impedance Z4, combined with the connection relationship between the first conversion module and the second conversion module in the dynamic simulated converter station, the simulated impedance (which can be represented by Z) of the dynamic simulated converter station is determined.

[0151] Furthermore, the dynamic simulation module is specifically used for:

[0152] Obtain the third actual impedance (which can be represented by Z5).

[0153] According to the dynamic simulation of the three-phase AC port current of the filter module in the converter station, the third simulation impedance Z is determined in combination with Ohm's law. RLC .

[0154] According to the third actual impedance Z5, the third simulated impedance Z RLC Correction is made, that is, the third simulated impedance Z RLC The third simulated impedance Z6 is obtained by making it as equal to the third actual impedance Z5 as possible.

[0155] Optionally, the dynamic simulation module 23 specifically calculates the third simulation impedance Z as follows: RLC :

[0156]

[0157] Among them, Z RLC Y represents the third simulated impedance. RLCdd represents the d-axis self-impedance of the AC port impedance of the filter module in the dynamic simulation converter station after Clark transformation, Y RLCqq It represents the q-axis self-impedance after Clark transformation of the AC port impedance of the filter module in the dynamic simulation converter station. RLCdq , Y RLCqd It represents the dq axis mutual impedance of the AC port impedance of the filter module in the dynamic simulation converter station after Clarke transformation. RLCd represents the d-axis voltage component of the AC port voltage of the filter module in the dynamic simulation converter station after Clarke transformation, u RLCq It represents the q-axis voltage component of the AC port voltage of the filter module in the dynamic simulation converter station after Clark transformation. RLCd represents the d-axis current component of the AC port current of the filter module in the dynamic simulation converter station after Clarke transformation, i RLCq It represents the q-axis current component of the AC port current of the filter module in the dynamic simulation converter station after Clarke transformation.

[0158] Exemplarily, when the first conversion module and the second conversion module are connected in series in the dynamic simulation converter station, the dynamic simulation device calculates the simulated impedance Z of the dynamic simulation converter station according to the following formula:

[0159]

[0160] When the first conversion module and the second conversion module are connected in parallel in the dynamic simulation converter station, the dynamic simulation device calculates the simulated impedance Z of the dynamic simulation converter station according to the following formula:

[0161]

[0162] Where Z represents the simulated impedance of the dynamic simulated converter station, Z DRUrepresents the first simulated impedance, Z VSC represents the second simulated impedance, Z RLC represents the third simulated impedance.

[0163] Embodiment 3:

[0164] Based on the same inventive concept, the embodiment of the present application also provides a computer device, which includes a processor and a memory, the memory is used to store a computer program, the computer program includes program instructions, and the processor is used to execute the program instructions stored in the computer storage medium. The processor may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components, etc., which are the computing core and control core of the terminal, which are suitable for implementing one or more instructions, and are specifically suitable for loading and executing one or more instructions in the computer storage medium to implement the corresponding method flow or corresponding functions, so as to implement the steps of the dynamic simulation method provided in the above embodiment.

[0165] Embodiment 4:

[0166] Based on the same inventive concept, the embodiment of the present application also provides a computer-readable storage medium, specifically a computer-readable storage medium (Memory), which is a memory device in a computer device for storing programs and data. It is understandable that the computer-readable storage medium here can include both a built-in storage medium in a computer device and an extended storage medium supported by the computer device. The computer-readable storage medium provides a storage space, which stores the operating system of the terminal. In addition, one or more instructions suitable for being loaded and executed by a processor are also stored in the storage space, and these instructions can be one or more computer programs (including program codes). It should be noted that the computer-readable storage medium here can be a high-speed RAM memory or a non-volatile memory, such as at least one disk memory. The processor can load and execute one or more instructions stored in the computer-readable storage medium to implement the steps of the dynamic simulation method provided in the above embodiment.

[0167] Those skilled in the art will appreciate that the embodiments of the application may be provided as methods, systems, or computer program products. Therefore, the application may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the application may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0168] The application is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the application. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0169] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0170] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0171] The above are merely embodiments of the application and are not intended to limit the application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the application are included in the scope of the claims of the pending application.

Claims

1. A dynamic simulation method for a converter station, characterized in that: include: Correcting the first simulated impedance of the first conversion module in the dynamic simulated converter station according to the first actual impedance of the first conversion module in the actual converter station; Correcting the second simulated impedance of the second conversion module in the dynamic simulated converter station according to the second actual impedance of the second conversion module in the actual converter station; The dynamic simulation converter station is dynamically simulated according to the corrected first simulated impedance and the corrected second simulated impedance.

2. The dynamic simulation method according to claim 1, characterized in that: The step of correcting the first simulated impedance of the first conversion module in the dynamic simulation converter station according to the first actual impedance of the first conversion module in the actual converter station comprises: Acquire the first actual impedance; Determine the first simulated impedance according to the three-phase AC port current of the first conversion module in the dynamic simulation converter station and in combination with Ohm's law; The first simulated impedance is corrected according to the first actual impedance to obtain the corrected first simulated impedance.

3. The dynamic simulation method according to claim 2, characterized in that: The first simulated impedance satisfies: Among them, Z DRU represents the first simulated impedance; u DRUd represents the d-axis voltage component of the AC port voltage of the first conversion module in the dynamic simulation converter station after Clarke transformation, u DRUq represents the q-axis voltage component of the AC port voltage of the first conversion module in the dynamic simulation converter station after Clark transformation; i DRUd represents the d-axis current component of the AC port current of the first conversion module in the dynamic simulation converter station after Clarke transformation, i DRUq It represents the q-axis current component of the AC port current of the first conversion module in the dynamic simulation converter station after Clarke transformation.

4. The dynamic simulation method according to claim 1, characterized in that: The method of correcting the second simulated impedance of the second conversion module in the dynamic simulation converter station according to the second actual impedance of the second conversion module in the actual converter station comprises: obtaining the second actual impedance; Determine the second simulated impedance according to the three-phase AC port current of the second conversion module in the dynamic simulation converter station and in combination with Ohm's law; The second simulated impedance is corrected according to the second actual impedance to obtain the corrected second simulated impedance.

5. The dynamic simulation method according to claim 4, characterized in that: The second simulated impedance satisfies: Among them, Z VSC represents the second simulated impedance; u VSCd represents the d-axis voltage component of the AC port voltage of the second conversion module in the dynamic simulation converter station after Clarke transformation, u RVSCq represents the q-axis voltage component of the AC port voltage of the second conversion module in the dynamic simulation converter station after Clark transformation; i VSCd represents the d-axis current component of the AC port current of the second conversion module in the dynamic simulation converter station after Clarke transformation, i VSCq It represents the q-axis current component of the AC port current of the second conversion module in the dynamic simulation converter station after Clarke transformation.

6. The dynamic simulation method according to claim 1, characterized in that: The dynamically simulating the dynamic simulated converter station according to the corrected first simulated impedance and the modified second simulated impedance comprises: Correcting the third simulated impedance of the filter module in the dynamic simulated converter station according to the third actual impedance of the filter module in the actual converter station; The simulated impedance of the dynamic simulated converter station is determined according to the corrected third simulated impedance, the corrected first simulated impedance and the modified second simulated impedance, combined with the connection relationship between the first conversion module and the second conversion module in the dynamic simulated converter station.

7. The dynamic simulation method according to claim 6, characterized in that: The step of correcting the third simulated impedance of the filter module in the dynamic simulated converter station according to the third actual impedance of the filter module in the actual converter station comprises: Acquiring the third actual impedance; Determine the third simulated impedance according to the three-phase AC port current of the filter module in the dynamic simulated converter station and in combination with Ohm's law; The third simulated impedance is corrected according to the third actual impedance to obtain the corrected third simulated impedance.

8. The dynamic simulation method according to claim 7, characterized in that: The third simulated impedance satisfies: Among them, Z RLC represents the third simulated impedance; u RLCd represents the d-axis voltage component of the AC port voltage of the filter module in the dynamic simulation converter station after Clarke transformation, u RLCq represents the q-axis voltage component of the AC port voltage of the filter module in the dynamic simulation converter station after Clark transformation; i RLCd represents the d-axis current component of the AC port current of the filter module in the dynamic simulation converter station after Clarke transformation, i RLCq It represents the q-axis current component of the AC port current of the filter module in the dynamic simulation converter station after Clarke transformation.

9. The dynamic simulation method according to claim 6, characterized in that: When the first conversion module and the second conversion module are connected in series in the dynamic simulation converter station, the simulation impedance of the dynamic simulation converter station satisfies: When the first conversion module and the second conversion module in the dynamic simulation converter station are connected in parallel, the simulation impedance of the dynamic simulation converter station satisfies: Wherein, Z represents the simulated impedance of the dynamic simulated converter station, Z DRU Denotes the first simulated impedance, Z VSC Denotes the second simulated impedance, Z RLC represents the third simulated impedance.

10. A dynamic simulation device for a converter station, characterized in that: include: A first correction module, configured to correct a first simulated impedance of a first conversion module in the dynamic simulation converter station according to a first actual impedance of a first conversion module in the actual converter station; A second correction module, configured to correct a second simulated impedance of a second conversion module in the dynamic simulation converter station according to a second actual impedance of a second conversion module in the actual converter station; The dynamic simulation module is used to dynamically simulate the dynamic simulation converter station according to the corrected first simulation impedance and the corrected second simulation impedance.

11. The dynamic simulation device according to claim 10, characterized in that: The first correction module is specifically used for: Acquire the first actual impedance; Determine the first simulated impedance according to the three-phase AC port current of the first conversion module in the dynamic simulation converter station and in combination with Ohm's law; The first simulated impedance is corrected according to the first actual impedance to obtain the corrected first simulated impedance.

12. The dynamic simulation device according to claim 11, characterized in that: The first correction module calculates the first simulated impedance according to the following formula: Among them, Z DRU represents the first simulated impedance; u DRUd represents the d-axis voltage component of the AC port voltage of the first conversion module in the dynamic simulation converter station after Clarke transformation, u DRUq represents the q-axis voltage component of the AC port voltage of the first conversion module in the dynamic simulation converter station after Clark transformation; i DRUd represents the d-axis current component of the AC port current of the first conversion module in the dynamic simulation converter station after Clarke transformation, i DRUq It represents the q-axis current component of the AC port current of the first conversion module in the dynamic simulation converter station after Clarke transformation.

13. The dynamic simulation device according to claim 10, characterized in that: The second correction module is specifically used for: obtaining the second actual impedance; Determine the second simulated impedance according to the three-phase AC port current of the second conversion module in the dynamic simulation converter station and in combination with Ohm's law; The second simulated impedance is corrected according to the second actual impedance to obtain the corrected second simulated impedance.

14. The dynamic simulation device according to claim 13, characterized in that: The second correction module calculates the second simulated impedance according to the following formula: Among them, Z VSC represents the second simulated impedance; u VSCd represents the d-axis voltage component of the AC port voltage of the second conversion module in the dynamic simulation converter station after Clarke transformation, u RVSCq represents the q-axis voltage component of the AC port voltage of the second conversion module in the dynamic simulation converter station after Clark transformation; i VSCd represents the d-axis current component of the AC port current of the second conversion module in the dynamic simulation converter station after Clarke transformation, i VSCq It represents the q-axis current component of the AC port current of the second conversion module in the dynamic simulation converter station after Clarke transformation.

15. The dynamic simulation device according to claim 10, characterized in that: The dynamic simulation module is specifically used for: Correcting the third simulated impedance of the filter module in the dynamic simulated converter station according to the third actual impedance of the filter module in the actual converter station; The simulated impedance of the dynamic simulated converter station is determined according to the corrected third simulated impedance, the corrected first simulated impedance and the modified second simulated impedance, combined with the connection relationship between the first conversion module and the second conversion module in the dynamic simulated converter station.

16. The dynamic simulation device according to claim 15, characterized in that: The dynamic simulation module is specifically used for: Acquiring the third actual impedance; Determine the third simulated impedance according to the three-phase AC port current of the filter module in the dynamic simulated converter station and in combination with Ohm's law; The third simulated impedance is corrected according to the third actual impedance to obtain the corrected third simulated impedance.

17. The dynamic simulation device according to claim 16, characterized in that: The dynamic simulation module specifically calculates the third simulation impedance according to the following formula: Among them, Z RLC represents the third simulated impedance; u RLCd represents the d-axis voltage component of the AC port voltage of the filter module in the dynamic simulation converter station after Clarke transformation, u RLCq represents the q-axis voltage component of the AC port voltage of the filter module in the dynamic simulation converter station after Clark transformation; i RLCd represents the d-axis current component of the AC port current of the filter module in the dynamic simulation converter station after Clarke transformation, i RLCq It represents the q-axis current component of the AC port current of the filter module in the dynamic simulation converter station after Clarke transformation.

18. The dynamic simulation device according to claim 15, characterized in that: When the first conversion module and the second conversion module are connected in series in the dynamic simulation converter station, the dynamic simulation device calculates the simulated impedance of the dynamic simulation converter station according to the following formula: When the first conversion module and the second conversion module are connected in parallel in the dynamic simulation converter station, the dynamic simulation device calculates the simulated impedance of the dynamic simulation converter station according to the following formula: Wherein, Z represents the simulated impedance of the dynamic simulated converter station, Z DRU Denotes the first simulated impedance, Z VSC Denotes the second simulated impedance, Z RLC represents the third simulated impedance.

19. A computer device, characterized in that: include: one or more processors; The processor is used to store one or more programs; When the one or more programs are executed by the one or more processors, the dynamic simulation method according to any one of claims 1 to 9 is implemented.

20. A computer-readable storage medium, characterized in that: A computer program is stored thereon, and when the computer program is executed, the dynamic simulation method as claimed in any one of claims 1 to 9 is implemented.

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