CN112231935A - Method and device for calculating harmonic impedance of direct-current loop of converter and computer equipment - Google Patents
Method and device for calculating harmonic impedance of direct-current loop of converter and computer equipment Download PDFInfo
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Abstract
The invention provides a method, a device and computer equipment for calculating direct current loop harmonic impedance of a converter, wherein the method comprises the steps of obtaining state space parameters and a direct current loop harmonic impedance model of the converter; the direct-current loop harmonic impedance model is constructed in advance based on the control principle of the converter system and represents the analytic relation between the direct-current loop harmonic impedance and the state space parameters of the converter; and calculating the harmonic impedance of the direct current loop according to the state space parameters and the harmonic impedance model of the direct current loop. According to the method for calculating the harmonic impedance of the direct current loop, the harmonic impedance of the direct current loop can be calculated only by inputting the state space parameters into the harmonic impedance model of the direct current loop, and the method is simple and easy to operate and high in accuracy.
Description
Technical Field
The invention relates to the technical field of converter design, in particular to a method and a device for calculating direct-current loop harmonic impedance of a converter, computer equipment and a computer readable storage medium.
Background
Converters, especially based on thyristor semiconductor switches, are widely used in many fields requiring direct current power. The inverter generates direct current on the direct current side and also generates harmonics. Among them, the direct current harmonics cause many hazards. In order to suppress the influence of the harmonic waves on the system and equipment, the harmonic impedance of a direct current loop needs to be calculated during the design of a converter system.
At present, simulation software such as electromagnetic transient is mainly adopted to scan to obtain harmonic impedance of a direct current loop, then a system is adjusted according to the harmonic impedance of the direct current loop, after adjustment, the simulation software such as electromagnetic transient is adopted to scan to obtain the adjusted harmonic impedance of the direct current loop, and final primary equipment parameters and harmonic impedance results of the direct current loop are obtained through repeated adjustment for many times, so that the harmonic of the direct current loop is suppressed, and the safe operation of the system and equipment is ensured. The method needs to repeatedly perform adjustment calculation, and is low in efficiency.
Disclosure of Invention
In view of this, the present invention provides a method, an apparatus, a computer device, and a computer readable storage medium for calculating a dc loop harmonic impedance of a converter, so as to overcome the problem that the efficiency is low because the dc loop harmonic impedance needs to be adjusted and calculated repeatedly in the prior art.
In order to achieve the purpose, the invention provides the following technical scheme:
in a first aspect, an embodiment of the present invention provides a method for calculating a harmonic impedance of a dc loop of a converter, including the following steps:
acquiring state space parameters of the current converter and a harmonic impedance model of the direct current loop; the direct-current loop harmonic impedance model is constructed in advance based on the control principle of the converter system and represents the analytical relation between the direct-current loop harmonic impedance and the state space parameters of the converter;
and calculating the harmonic impedance of the direct current loop according to the state space parameters and the harmonic impedance model of the direct current loop.
In a second aspect, an embodiment of the present invention provides a dc loop harmonic impedance calculating apparatus for a converter, including:
the parameter and model acquisition module is used for acquiring state space parameters of the current converter and a harmonic impedance model of the direct current loop; the direct-current loop harmonic impedance model is constructed in advance based on the control principle of the converter system and represents the analytical relation between the direct-current loop harmonic impedance and the state space parameters of the converter;
and the direct current loop harmonic impedance calculation module is used for calculating the direct current loop harmonic impedance according to the state space parameters and the direct current loop harmonic impedance model.
In a third aspect, an embodiment of the present invention provides a computer device, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor, and when the processor executes the computer program, the processor implements the method for calculating the dc loop harmonic impedance of the inverter according to the first aspect.
In a fourth aspect, an embodiment of the present invention provides a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the method for calculating the dc loop harmonic impedance of the converter according to the first aspect.
According to the method, the device, the computer equipment and the computer readable storage medium for calculating the harmonic impedance of the direct current loop of the converter, the state space parameters and the harmonic impedance model of the direct current loop of the converter are obtained, and then the harmonic impedance of the direct current loop is calculated according to the state space parameters and the harmonic impedance model of the direct current loop; the direct-current loop harmonic impedance model is constructed in advance based on the control principle of the converter system and represents the analytic relation between the direct-current loop harmonic impedance and the state space parameters of the converter. According to the method for calculating the harmonic impedance of the direct current loop, the harmonic impedance of the direct current loop can be calculated only by inputting the state space parameters into the harmonic impedance model of the direct current loop, and the method is simple and easy to operate and high in accuracy.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic flow chart of a method for calculating a harmonic impedance of a dc loop of a converter according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a twelve-pulse inverter according to an embodiment of the present invention;
fig. 3 is a control system framework diagram of a twelve-pulse converter according to an embodiment of the present invention;
fig. 4 is a control system framework diagram of a twelve-pulse inverter according to another embodiment of the present invention;
fig. 5 is a schematic diagram illustrating a calculation flow of dc loop impedance of a twelve-pulse converter according to an embodiment of the present invention;
fig. 6 is a diagram of a harmonic impedance spectrum of a dc loop of a twelve-pulse converter according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of a dc loop harmonic impedance calculation apparatus of a converter according to an embodiment of the present invention;
fig. 8 is a schematic structural diagram of a computer device according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In order to explain the present invention in more detail, the following describes a method, an apparatus, a computer device, and a computer readable storage medium for calculating a dc loop harmonic impedance of a converter according to the present invention in detail with reference to the accompanying drawings.
The method is applied to the terminal, and the terminal can be a personal computer, a notebook computer and the like.
In one embodiment, as shown in fig. 1, a method for calculating a harmonic impedance of a dc loop of a converter is provided, which is described by taking the method as an example for a terminal, and includes the following steps:
step S102, obtaining state space parameters of a current converter and a harmonic impedance model of a direct current loop; the direct-current loop harmonic impedance model is constructed in advance based on the control principle of the converter system and represents the analytic relation between the direct-current loop harmonic impedance and the state space parameters of the converter;
the state space parameters of the converter comprise direct current output voltage of the converter, direct current output current of the converter, a trigger angle control value of the converter, alternating current output voltage of the converter, a current reference value and the like, and parameters obtained by conversion processing according to the parameters.
The direct current loop harmonic impedance model is constructed in advance, and an analytic relation between the direct current loop harmonic impedance and state space parameters of the converter is determined based on a control principle of the converter system in the construction process, wherein the analytic relation is the direct current loop harmonic impedance model.
And step S104, calculating the harmonic impedance of the direct current loop according to the state space parameters and the harmonic impedance model of the direct current loop.
According to the method for calculating the harmonic impedance of the direct current loop of the current converter, the state space parameters and the harmonic impedance model of the direct current loop of the current converter are obtained, and then the harmonic impedance of the direct current loop is calculated according to the state space parameters and the harmonic impedance model of the direct current loop; the direct-current loop harmonic impedance model is constructed in advance based on the control principle of the converter system and represents the analytic relation between the direct-current loop harmonic impedance and the state space parameters of the converter. According to the method for calculating the harmonic impedance of the direct current loop, the harmonic impedance of the direct current loop can be calculated only by inputting the state space parameters into the harmonic impedance model of the direct current loop, and the method is simple and easy to operate and high in accuracy.
In one embodiment, the inverter is a twelve pulse inverter.
Specifically, the twelve-pulse converter is a semiconductor switch with 12 thyristors, and a direct-current voltage with 12 pulses in one electrical cycle is generated on the direct-current side through the alternate turning-on of the 12 switches. The twelve-pulse converter has good direct current voltage and alternating current quality and contains few harmonic components. In addition, the filter device can be simplified, and the cost of the converter station is saved.
In one embodiment, the step of establishing the harmonic impedance model of the dc loop includes:
obtaining an alternating current impedance voltage drop analytic value; establishing an alternating current impedance voltage drop system control architecture diagram of the converter according to a control principle of the converter system and the alternating current impedance voltage drop analytic value;
establishing a state space equation of the converter system according to the alternating current impedance voltage drop system control architecture diagram; and determining the relation between the state space parameters and the harmonic impedance of the direct current loop according to a state space equation, and establishing a harmonic impedance model of the direct current loop.
In this embodiment, in the process of construction, first, an ac impedance voltage drop analytic value is obtained, an ac impedance voltage drop system control architecture diagram of the converter is established based on the ac impedance voltage drop analytic value and a control principle of the converter system, then, a state space equation of the converter system is established according to the ac impedance voltage drop system control architecture diagram of the converter, where the state space equation of the converter system may represent the relationship of state parameters (such as voltage, current, resistance, etc.) of each system, and then, a mathematical expression of the dc loop harmonic impedance (i.e., a dc loop harmonic impedance model) is derived according to the relationship and a calculation principle of the dc loop impedance; according to the mathematical expression of the harmonic impedance of the direct current loop, the analytic relationship between the harmonic impedance of the direct current loop and each system parameter of the converter system can be clearly known, namely the change rule existing between the harmonic impedance of the direct current loop and each system parameter of the converter system, so that the harmonic impedance value of the direct current loop can be calculated according to the system parameters, and each system parameter can be adjusted according to the requirement of the harmonic impedance value of the direct current loop.
In one embodiment, the dc loop harmonic impedance model is expressed as:
wherein Z isDC(s) represents a harmonic impedance model of the direct current loop, s represents a Laplace operator, I represents a second order unit matrix, A represents a state equation matrix obtained by performing derivative calculation on a differential equation system of system state variables, B represents an input voltage matrix obtained by performing derivative calculation on input direct current voltage parameters, and (2) represents a second matrix unit of the matrix.
In one embodiment, the expression of the state space equation is:
wherein the content of the first and second substances,
expressing a state space equation, wherein X expresses a state space parameter matrix, and U expresses an input direct-current voltage parameter; the state space parameter matrix is [ X1; i isDC]X1 and IDCThe expression of (a) is:
IDCrepresenting direct current, VDC2Representing an input DC voltage parameter, VDCL represents a direct current inductance.
In one embodiment, the step of determining the relationship between the state space parameter and the harmonic impedance of the dc loop according to the state space equation comprises: the dc loop harmonic impedance is calculated using the following expression:
In order to explain the technical solution of the present application more specifically, the method of the present application will be explained in detail below to realize the complete process in the twelve-pulse converter.
First, a schematic diagram of a conventional twelve-pulse converter is shown in fig. 2. A twelve-pulse inverter generally comprises the following components: the converter comprises an alternating current side voltage source Vac, an alternating current side inductor Lac, an alternating current side resistor Rac, a grounding point G, a converter transformer side voltage Vp, converter transformers T1 and T2 (the voltage transformation ratio of a primary side and a secondary side is 1:1 for simplifying calculation), an inverter (namely V1 and V2), a direct current side inductor L1 and a resistor R1, wherein the inverter part comprises 12 thyristor semiconductor switches.
When the twelve-pulse converter normally works, the converter sequentially turns on 12 switches every 120 degrees of electrical angle, the cycle is repeated, the voltage Vac on the alternating current side is sequentially and continuously conducted to the direct current side, and a direct current voltage with 12 pulses in one electrical cycle is generated on the direct current side, so that the conversion from alternating current to direct current is realized.
The inductor L1 on the dc side is a dc smoothing inductor for filtering dc higher harmonics, and R1 is a dc equivalent load. Direct current is IDCDC voltage of VdcIn which V isdcWith an alternating voltage VpAnd the firing angle alpha, etc. The converter can change the voltage V at the DC side by adjusting the turn-on time of 12 switches, i.e. the firing angle alphadcOr current IDCWhen V is greater thandcOr IdcThe value is collected and fed back to the controller for calculation to adjust the trigger angle, so that the automatic control of the direct current output voltage or current can be realized.
Referring to FIG. 2, IDCIs the actual DC current value, IrefThe difference value obtained by subtracting the current reference value expected by the direct current side is Ier，IerThe process is in a proportion link KpAnd an integration element
Adding the processed signals to obtain a trigger angle control value alpha of the twelve-pulse bridge, and sending the alpha to a twelve-pulse converter which comes according to the alphaControlling the turn-on time of 12 switches to realize the voltage VDCRegulation of, DC voltage VDCRegulated, direct current IDCWith consequent change, ofDCContinue to be sent back to the controller andIrefmaking a comparison until IerIs 0, finally makes IDCTo a desired current reference value Iref. When the twelve-pulse current converter normally operates, parameters such as alternating voltage, direct current and trigger angle are kept stable.
The 12-pulse converter modeling method comprises the following steps:
referring to fig. 2, 12 pulsating converter dc voltage VDCIs represented by formula 1.
Wherein Xr＝2πfLsF is the power supply voltage frequency, and the DC voltage V can be obtained from the formula 1DCThe perturbation expression of (c) is as follows:
wherein Δ VPFor small disturbance change quantity of voltage Vp at converter transformer network side, differential equation of Vp is as follows
Since equation (3) is a three-phase differential equation, for the convenience of calculation, a vector method is adopted for calculation, and a vector diagram of a relevant vector is shown in fig. 3. Wherein the vector equation corresponding to figure 3 is as follows:
based on the operating principle of 12-pulse converter, the relation of the related variables at the AC/DC side can be obtained as follows
Wherein mu is the commutation angle phi of the inverteriacIs the Iac phase, phiacIs Vac phase, phizacIs the ac grid impedance angle.
In addition, impedance Zac-related expression is as follows
From formulas (2) to (6): Δ Vp＝K1Δα+K2ΔIDC (7)
Wherein K1 and K2 are constant coefficients calculated by the equations (2) to (6), that is, ac impedance voltage drop analytic values are obtained.
From (2) and formula (7):
the ac impedance voltage drop system control architecture diagram of the 12-pulse inverter can be seen from fig. 3 and equation (8), as shown in fig. 4. Referring to FIGS. 2 and 4, let X1 and IDCAs variables, the system of differential equations can be derived as follows:
wherein VDC2For DC side harmonic injection voltage, V is the harmonic when there is noDC2Is 0.
According to formula (9), let X1 and IDCAs the state space parameter (i.e., state variable), the state space equation of the 12-pulse converter can be obtained as follows:
wherein X is a state space parameter matrix [ X1; i isDC]A is a state equation matrix obtained by differentiating the state space parameters, namely, the state equation matrix obtained by differentiating the state space parameters by the formula (9), and U is an input direct-current voltage parameter VDC2B is an input voltage matrix obtained by differentiating the input dc voltage parameter, i.e., B is an input state matrix obtained by differentiating the input dc voltage parameter by equation (9).
In addition, the expression of the direct current loop of the 12-pulse converter system is as follows
The analytical calculation expression of the DC loop impedance of the 12-pulse converter can be obtained as
Where s is the laplacian, and I represents a second order identity matrix.
In summary, as shown in fig. 5, the impedance design process of the present invention is as follows: firstly, inputting system parameters, and solving the delta Vp to obtain coefficients K1 and K2 (namely an alternating current impedance voltage drop analytic value); then, an integral control frame diagram of the converter system is built, a system state space equation is formed, space state parameters are set, and the impedance value of a direct current loop of the converter is obtained; then judging whether the impedance finger meets the requirement, if so, outputting direct current impedance; if not, the state space parameters are reset.
The direct current loop harmonic impedance calculation method of the converter in the embodiment of the invention can accurately calculate the voltage drop on the internal impedance of a voltage source when calculating the harmonic impedance of a 12-pulse direct current loop, thereby obtaining the analytical calculation expression of the primary voltage of the Y-Y converter transformer and the Y-D converter transformer, directly drawing the overall system control framework block diagram of the 12-pulse converter based on the expression, clearly combing the logical relation among the variables of the system through the control framework block diagram, building a state space equation capable of reflecting the overall dynamic characteristic of the system, setting the system parameters of the state space, obtaining the analytical calculation expression of the direct current loop impedance in the s domain through analytical calculation, converting the s domain into the frequency domain, thereby obtaining the frequency spectrum diagram of the impedance value of the direct current loop, and if the obtained impedance frequency spectrum has resonance points which do not meet the actual requirements, the impedance of the direct current loop of the system needs to be adjusted, complex processes such as modeling and the like do not need to be repeated, a series of new impedance frequency spectrums of the direct current loop can be obtained only by properly adjusting certain system parameters according to needs and then performing impedance calculation, and the frequency spectrums meeting the requirements are selected to complete the calculation and design of the impedance of the direct current loop of the system.
Effect embodiment:
referring to fig. 2, when the effective value of the ac voltage Vac line voltage is 10kV, the frequency is 50Hz, Lac is 0.4mH, Ls is 1mH, the dc load inductance L is 0.2H, the resistance R is 12 Ω, the dc current 2000A, Kp is 0.001, and Ki is 0.4. The direct current loop harmonic impedance model in the direct current loop harmonic impedance calculation method of the converter is adopted, then the direct current loop harmonic impedance of the 12-pulse converter is obtained through calculation, and the result is shown in figure 6. As shown in fig. 6, the dc loop impedance of the 12-pulse inverter has a low impedance value at a low frequency of about 20Hz, and the system needs to avoid harmonic voltages around the frequency.
It should be understood that, although the steps in the flowchart of fig. 1 are shown in order as indicated by the arrows, the steps are not necessarily performed in order as indicated by the arrows. The steps are not performed in the exact order shown and described, and may be performed in other orders, unless explicitly stated otherwise. Moreover, at least a portion of the steps in fig. 1 may include multiple sub-steps or multiple stages that are not necessarily performed at the same time, but may be performed at different times, and the order of performance of the sub-steps or stages is not necessarily sequential, but may be performed in turn or alternately with other steps or at least a portion of the sub-steps or stages of other steps.
The above embodiments of the present disclosure describe in detail a method for calculating a harmonic impedance of a dc loop of a converter, and the above method disclosed by the present disclosure may be implemented by various types of devices.
Referring to fig. 7, a dc loop harmonic impedance calculating apparatus of a converter according to an embodiment of the present invention mainly includes:
a parameter and model obtaining module 702, configured to obtain state space parameters of the converter and a harmonic impedance model of the dc loop; the direct-current loop harmonic impedance model is constructed in advance based on the control principle of the converter system and represents the analytic relation between the direct-current loop harmonic impedance and the state space parameters of the converter;
and a dc loop harmonic impedance calculating module 704, configured to calculate a dc loop harmonic impedance according to the state space parameter and the dc loop harmonic impedance model.
In one embodiment, further comprising:
the analysis value acquisition module is used for acquiring an alternating current impedance voltage drop analysis value;
the system control architecture diagram establishing module is used for establishing an alternating current impedance voltage drop system control architecture diagram of the current converter according to the control principle of the current converter system and the alternating current impedance voltage drop analytic value;
the state space equation establishing module is used for establishing a state space equation of the converter system according to the alternating current impedance voltage drop system control architecture diagram;
and the direct current loop harmonic impedance model establishing module is used for determining the relation between the state space parameters and the direct current loop harmonic impedance according to the state space equation and establishing a direct current loop harmonic impedance model.
In one embodiment, the expression of the dc loop harmonic impedance model is:
In one embodiment, the expression of the state space equation is: the expression of the state space equation is:
wherein the content of the first and second substances,
expressing a state space equation, wherein X expresses a state space parameter matrix, and U expresses an input direct-current voltage parameter; the state space parameter matrix is [ X1; i isDC]X1 and IDCThe expression of (a) is:
IDCrepresenting direct current, VDC2Representing an input DC voltage parameter, VDCL represents a direct current inductance.
In one embodiment, the dc loop harmonic impedance is expressed by:
In one embodiment, the inverter is a twelve pulse inverter.
For specific limitations of the dc loop harmonic impedance calculation apparatus of the inverter, reference may be made to the above limitations of the dc loop harmonic impedance calculation method of the inverter, and details are not repeated here. All or part of the modules in the direct-current loop harmonic impedance calculation device of the converter can be realized by software, hardware and a combination thereof. The modules can be embedded in a hardware form or independent from a processor in the computer device, and can also be stored in a memory in the computer device in a software form, so that the processor can call and execute operations corresponding to the modules.
An embodiment of the present invention further provides a computer device, where the computer device may be a server, and an internal structure diagram of the computer device may be as shown in fig. 8. The computer device includes a processor, a memory, a network interface, and a database connected by a system bus. Wherein the processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device comprises a nonvolatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program, and a database. The internal memory provides an environment for the operation of an operating system and computer programs in the non-volatile storage medium. The database of the computer equipment is used for storing data of the resistance equivalent model and the equivalent submodel, and storing equivalent resistance, working resistance and contact resistance obtained in the process of executing calculation. The network interface of the computer device is used for communicating with an external terminal through a network connection. The computer program is executed by a processor to implement a method of calculating a dc loop harmonic impedance of an inverter.
Those skilled in the art will appreciate that the architecture shown in fig. 8 is merely a block diagram of some of the structures associated with the disclosed aspects and is not intended to limit the computing devices to which the disclosed aspects apply, as particular computing devices may include more or less components than those shown, or may combine certain components, or have a different arrangement of components.
In one embodiment, a computer apparatus is provided, comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing any one of the method steps of the dc loop harmonic impedance calculation method of an inverter provided in an embodiment of the present invention when executing the computer program.
Embodiments of the present invention further provide a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements any one of the method steps in the dc loop harmonic impedance calculation method of the inverter provided in the embodiments of the present invention.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. A software module may reside in Random Access Memory (RAM), memory, Read Only Memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A method for calculating harmonic impedance of a direct current loop of a converter is characterized by comprising the following steps:
acquiring state space parameters of the current converter and a harmonic impedance model of the direct current loop; the direct-current loop harmonic impedance model is constructed in advance based on the control principle of the converter system and represents the analytical relation between the direct-current loop harmonic impedance and the state space parameters of the converter;
and calculating the harmonic impedance of the direct current loop according to the state space parameters and the harmonic impedance model of the direct current loop.
2. The method of claim 1, wherein the step of establishing the harmonic impedance model of the dc loop comprises:
obtaining an alternating current impedance voltage drop analytic value;
establishing an alternating current impedance voltage drop system control architecture diagram of the converter according to a control principle of the converter system and the alternating current impedance voltage drop analytic value;
establishing a state space equation of the converter system according to the alternating current impedance voltage drop system control architecture diagram;
and determining the relation between the state space parameters and the harmonic impedance of the direct current loop according to the state space equation, and establishing a harmonic impedance model of the direct current loop.
3. The method of claim 2, wherein the dc loop harmonic impedance model is expressed as:
wherein Z isDC(s) represents a harmonic impedance model of the direct current loop, s represents a Laplace operator, I represents a second order unit matrix, A represents a state equation matrix obtained by performing derivative calculation on a differential equation system of system state variables, B represents an input voltage matrix obtained by performing derivative calculation on input direct current voltage parameters, and (2) represents a second matrix unit of the matrix.
4. The method of claim 3, wherein the state space equation is expressed as:
wherein the content of the first and second substances,
expressing a state space equation, wherein X expresses a state space parameter matrix, and U expresses an input direct-current voltage parameter; the state space parameter matrix is [ X1; i isDC]X1 and IDCThe expression of (a) is:
IDCrepresenting direct current, VDC2Representing an input DC voltage parameter, VDCL represents a direct current inductance.
5. The method according to any one of claims 2-4, wherein the step of determining the state space parameter versus DC loop harmonic impedance from the state space equation comprises:
the expression of the harmonic impedance of the direct current loop is as follows:
wherein Z isDCRepresenting harmonic impedance, V, of the DC circuitDC2Representing the input DC voltage parameter, IDCRepresenting a direct current.
6. The method of claim 5, wherein the inverter is a twelve pulse inverter.
7. A direct current loop harmonic impedance calculation device of a converter is characterized by comprising:
the parameter and model acquisition module is used for acquiring state space parameters of the current converter and a harmonic impedance model of the direct current loop; the direct-current loop harmonic impedance model is constructed in advance based on the control principle of the converter system and represents the analytical relation between the direct-current loop harmonic impedance and the state space parameters of the converter;
and the direct current loop harmonic impedance calculation module is used for calculating the direct current loop harmonic impedance according to the state space parameters and the direct current loop harmonic impedance model.
8. The apparatus of claim 7, further comprising:
the analysis value acquisition module is used for acquiring an alternating current impedance voltage drop analysis value;
the system control architecture diagram establishing module is used for establishing an alternating current impedance voltage drop system control architecture diagram of the current converter according to the control principle of the current converter system and the alternating current impedance voltage drop analytic value;
the state space equation establishing module is used for establishing a state space equation of the converter system according to the alternating current impedance voltage drop system control architecture diagram;
and the direct current loop harmonic impedance model establishing module is used for determining the relation between the state space parameters and the direct current loop harmonic impedance according to the state space equation and establishing the direct current loop harmonic impedance model.
9. A computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the steps of the method of any one of claims 1 to 6 are performed when the computer program is executed by the processor.
10. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the method according to any one of claims 1 to 6.
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