CN110649620B - Converter direct-current resonance suppression method and device based on control parameter modulation - Google Patents
Converter direct-current resonance suppression method and device based on control parameter modulation Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/01—Arrangements for reducing harmonics or ripples
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
- H02J2003/365—Reducing harmonics or oscillations in HVDC
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
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Abstract
The application provides a method and a device for restraining direct current resonance of a current converter based on control parameter modulation, the current converter replaces primary equipment such as a current trap through constructing a direct current impedance model, when resonant current of different frequencies occurs to the current converter, different resistance values can be simulated only by adjusting parameters of the direct current impedance model based on feedback control, flexible wide-range adjustment of harmonic impedance of a direct current loop is achieved, hardware equipment does not need to be disassembled, assembled and adjusted, the technical problem that resonance restraining adjustment is not flexible due to the fact that the current converter restrains resonance on a direct current side in a mode of additionally installing the primary equipment such as the current trap is solved.
Description
Technical Field
The application relates to the field of power equipment control, in particular to a converter direct-current resonance suppression method and device based on control parameter modulation.
Background
With the progress of power technology, the current converter is widely applied to various fields needing direct current energy, such as direct current transmission, direct current ice melting and the like.
However, in the conventional inverter, when the dc side generates dc and also harmonics on the dc side due to alternate turning on of the switches, and when harmonics of a corresponding frequency are generated on the dc side due to various causes, a very large resonance current is generated on the dc side, and if the harmonics are generated on the dc side, a destructive damage is caused to the inverter and equipment of a line adjacent to the inverter in a serious case.
Disclosure of Invention
The application provides a converter direct current resonance suppression method and device based on control parameter modulation, which are used for solving the technical problem that resonance suppression and adjustment are not flexible due to the fact that the existing converter suppresses resonance on a direct current side in a mode of additionally installing primary equipment such as a wave trap.
In view of this, the first aspect of the present application provides a method for suppressing dc resonance of a converter based on control parameter modulation, including:
acquiring a direct current signal output by the converter;
and judging whether the resonant current and the resonant frequency point of the converter are within a preset normal range or not based on the direct current signal, if not, adjusting the parameters of the direct current impedance model in a feedback control mode based on the direct current impedance model and the direct current signal input to the direct current impedance model until the resonant current and the resonant frequency point are within the preset normal range.
Optionally, the dc impedance model is specifically:
wherein Z is the analog impedance value of the DC impedance model, Δ Vs is the small signal variation of the preset harmonic disturbance voltage, Δ IDCIs the small signal variation of the direct current, K2Is a small signal transfer function, K, of the DC output voltage and the DC output current of the converter1For small signal transfer functions of DC output voltage and firing angle control values of the converter, KPAs a proportional control coefficient, KiFor the integral control coefficient, 1/S is the integral control constant.
Optionally, the adjusting, based on the dc impedance model and the dc electrical signal input to the dc impedance model, parameters of the dc impedance model in a feedback control manner until the resonant current and the resonant frequency point are within a preset normal range specifically includes:
and adjusting a proportional control coefficient and/or an integral control coefficient of the direct current impedance model in a feedback control mode based on the direct current impedance model and the direct current signal input to the direct current impedance model until the resonance current and the resonance frequency point are within a preset normal range.
Optionally, the direct current signal comprises: one or more of a DC output voltage of the converter, a DC output current of the converter, and a firing angle control value of the converter.
Optionally, the inverter specifically includes: six-pulse current converter.
The application provides a dc resonance suppression device for a converter based on control parameter modulation, including:
the electric signal acquisition module is used for acquiring the direct current signal output by the converter;
and the resonance suppression module is used for judging whether the resonance current and the resonance frequency point of the converter are within a preset normal range or not based on the direct current signal, and if not, adjusting the parameters of the direct current impedance model in a feedback control mode based on the direct current impedance model and the direct current signal input to the direct current impedance model until the resonance current and the resonance frequency point are within the preset normal range.
Optionally, the dc impedance model is specifically:
wherein Z is the analog impedance value of the DC impedance model, Δ Vs is the small signal variation of the preset harmonic disturbance voltage, Δ IDCIs the small signal variation of the direct current, K2Is a small signal transfer function, K, of the DC output voltage and the DC output current of the converter1For small signal transfer functions of DC output voltage and firing angle control values of the converter, KPAs a proportional control coefficient, KiFor the integral control coefficient, 1/S is the integral control constant.
Optionally, the resonance suppression module is specifically configured to:
and judging whether the resonant current and the resonant frequency point of the converter are within a preset normal range or not based on the direct current signal, if not, adjusting a proportional control coefficient and/or an integral control coefficient of the direct current impedance model in a feedback control mode based on the direct current impedance model and the direct current signal input to the direct current impedance model until the resonant current and the resonant frequency point are within the preset normal range.
A third aspect of the present application provides an apparatus comprising: a memory and a controller;
the memory is used for storing program codes corresponding to the inverter direct current resonance suppression method based on control parameter modulation according to the first aspect of the application;
the controller is configured to execute the program code.
A fourth aspect of the present application provides a storage medium, in which program codes corresponding to the inverter dc resonance suppression method based on control parameter modulation according to the first aspect of the present application are stored.
According to the technical scheme, the method has the following advantages:
the application provides a converter direct current resonance suppression method based on control parameter modulation, which comprises the following steps: acquiring a direct current signal output by the converter; and judging whether the resonant current and the resonant frequency point of the converter are within a preset normal range or not based on the direct current signal, if not, adjusting the parameters of the direct current impedance model in a feedback control mode based on the direct current impedance model and the direct current signal input to the direct current impedance model until the resonant current and the resonant frequency point are within the preset normal range.
This application replaces primary equipment such as current wave trapper through constructing direct current impedance model, when the transverter has appeared the resonant current of different frequency, only need adjust the parameter of direct current impedance model based on feedback control, can simulate out different resistances, realize the nimble wide range's of direct current loop harmonic impedance adjustment, need not to carry out dismouting and adjustment to hardware equipment, the mode of having solved current transverter through installing primary equipment such as wave trapper additional restraines the resonance of direct current side, the resonance that leads to suppresses the adjustment inflexible technical problem.
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In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.
Fig. 1 is a schematic flowchart of an embodiment of a method for suppressing dc resonance of a converter based on control parameter modulation according to the present application;
fig. 2 is a schematic structural diagram of an embodiment of an inverter dc resonance suppression device based on control parameter modulation provided in the present application;
fig. 3 is a schematic diagram of a converter constant current control loop of a converter dc resonance suppression method based on control parameter modulation according to the present application;
fig. 4 is a small signal transfer function block diagram of a converter direct current resonance suppression method based on control parameter modulation provided in the present application;
fig. 5 is a block diagram of a direct current loop harmonic impedance transfer function of a converter direct current resonance suppression method based on control parameter modulation according to the present application;
fig. 6 is a graph of a harmonic impedance spectrum in a dc resonance suppression method of a converter based on control parameter modulation according to the present application;
fig. 7 is a schematic diagram of a harmonic impedance spectrum change when only a proportional control coefficient is changed in a converter dc resonance suppression method based on control parameter modulation provided in the present application;
fig. 8 is a schematic diagram of a change of a harmonic impedance spectrum when only an integral control coefficient is changed in the converter direct-current resonance suppression method based on control parameter modulation provided by the present application.
Detailed Description
The embodiment of the application provides a method and a device for inhibiting direct current resonance of a converter based on control parameter modulation, which are used for solving the technical problem that resonance inhibition adjustment is not flexible due to the fact that the resonance of a direct current side of the existing converter is inhibited in a mode of additionally installing primary equipment such as a wave trap and the like.
It should be noted that, the inverter generates dc power on the dc side and also generates harmonics on the dc side by alternately turning on the switches, and when the dc side generates harmonics of a corresponding frequency due to various reasons, a very large resonant current is generated on the dc side, which may cause a destructive hazard to the inverter and its adjacent line devices in a serious case.
However, the existing solution mainly changes the main loop equipment of the system, such as primary equipment for suppressing harmonics, such as a wave trap, etc., which is added on the dc side, but the design parameters of these primary equipment are fixed and unchanged, and after the equipment is installed, the resonance suppression can only be performed on the previously designed frequency, when the resonance of other frequencies occurs due to various reasons in the dc, the previous wave trap may not be able to suppress the resonance well, and the primary equipment needs to be redesigned, disassembled, assembled and tested, so that the time cost and the investment cost are relatively high, and there are technical problems of narrow application range and inflexible resonance suppression.
In order to make the objects, features and advantages of the present invention more apparent and understandable, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the embodiments described below are only a part of the embodiments of the present application, and not all of the 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 application.
Referring to fig. 1, 3 to 8, an embodiment of the present application provides a method for suppressing dc resonance of a converter based on control parameter modulation, including:
and 101, acquiring a direct current signal output by the converter.
Wherein, the direct current signal includes: one or more of a dc output voltage of the inverter, a dc output current of the inverter, and a firing angle control value of the inverter.
And 102, judging whether the resonance current and the resonance frequency point of the converter are within a preset normal range or not based on the direct current signal, and if not, executing a step 103.
And 103, adjusting parameters of the direct current impedance model in a feedback control mode based on the direct current impedance model and the direct current signal input to the direct current impedance model until the resonance current and the resonance frequency point are within a preset normal range.
It should be noted that, based on the dc impedance model and the dc electrical signal input to the dc impedance model, the proportional control coefficient and/or the integral control coefficient of the dc impedance model are adjusted in a feedback control manner to simulate different impedances, and the change of the harmonic wave of the inverter during the impedance change is monitored until the resonance current and the resonance frequency point are within the preset normal range and the resonance phenomenon disappears.
The dc impedance model of this embodiment is specifically:
wherein Z is the analog impedance value of the DC impedance model, Δ Vs is the small signal variation of the preset harmonic disturbance voltage, Δ IDCIs the small signal variation of the direct current, K2Is a small signal transfer function, K, of the DC output voltage and the DC output current of the converter1For small signal transfer functions of DC output voltage and firing angle control values of the converter, KPAs a proportional control coefficient, KiFor the integral control coefficient, 1/S is the integral control constant.
To explain the technical solution of the present application more specifically, the method of the present application will be explained in detail below to implement the complete process in the six-pulse converter.
First, the main loop of the existing six-pulse converter generally includes the following components: three-phase voltage source Va, Vb, Vc on AC side, grounding point G, converter and inductor L on DC side1Resistance R1Wherein the converter section includes: s1, S2, S3, S4, S5 and S6 comprise 6 semiconductor switches.
When the six-pulse converter normally works, the converter sequentially turns on 6 switches of S1, S2, S3, S4, S5 and S6 at an electrical angle of 120 degrees, the switches are circularly reciprocated, three-phase voltages Va, Vb and Vc on an alternating current side are sequentially and continuously conducted to a direct current side, and a direct current voltage with 6 pulses in one electrical period is generated on the direct current side, so that the conversion from alternating current to direct current is realized.
Inductance L on the DC side1A flat wave inductor of DC for filtering out higher harmonics of DC, R1Is the equivalent load of direct current. Direct current is IDCDC voltage of VDCIn which V isDCWith an alternating voltage VpThe expression is expressed by the formula (1) in relation to the firing angle α and the like.
The inverter can change the voltage V at the DC side by adjusting the turn-on time of the 6 switches S1-S6, namely 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. 3, 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
After processing, adding to obtain a trigger angle control value alpha of a six-pulse bridge, sending the alpha to a six-pulse converter, and controlling the opening time of S1-S6 by the converter according to the alpha 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. Normal operation of six-pulse bridgeIn the invention, a small signal analysis method is adopted to carry out unified modeling on a main loop and a controller of the six-pulse bridge. The six-pulse bridge has nonlinearity due to the alternate opening of S1-S6, and the small signal model is differentiated according to two sides of formula 1 to obtain an expression of formula 2 below.
Due to AC voltage amplitude VpThe temperature of the molten steel is not changed,
is 0, and represents the small signal variation of each parameter by delta to obtain the output direct current voltage V of the six-pulse converterDCAnd its firing angle alpha is
Voltage V at DC sideDCAnd current IDCThe relational expression in the s domain is VDC(s)＝sL1IDC(s)+R1I(s) (4)
V is obtained according to formula 4DCAnd IDCThe small signal transfer function of (2) is as follows
In the formula, sL1Inductor L1The operational reactance of (1).
According to fig. 2 and equations 1-5, a small signal transfer function block diagram of the six-pulse converter shown in fig. 4 can be obtained.
In order to suppress the dc loop resonance of the six-pulse converter, the embodiment introduces a harmonic voltage input Δ Vs as a disturbance at the dc side based on the above obtained small signal transfer function block diagram, and the current reference value is not changed, i.e. Δ IrefTo 0, the small signal variation amount Delta I of the direct current at that time is obtainedDCThe block diagram of the harmonic impedance transfer function of the dc loop of the six-pulse converter shown in fig. 5 can be obtained.
Then based on the parameter relationship of the direct current loop harmonic impedance transfer function block diagram, the following can be obtained:
(ΔVDC+ΔVS)K2＝ΔIDC (7)
the small signal uniform transfer function of the dc loop impedance of the six-pulse converter obtained from equations 6 and 7 is:
up to this point, the process of constructing the dc impedance model of the present embodiment is completed, and the following is a process of performing resonance suppression based on the dc impedance model.
Now a set of parameters is given: AC voltage Vp6300V, frequency 50Hz, DC side inductance L10.05H, resistance R10.5 omega, DC reference value IrefIs 4000A, KpHas an initial value of 0.002, KiIs 0.5. A harmonic impedance spectrum of the six-pulse converter dc loop as shown in fig. 6 is obtained.
As can be seen from fig. 6, the impedance of the six-pulse dc loop has a lowest point near 300rad/s, about 16 Ω, and the impedance near the fundamental wave is generally low, both lower than 20 Ω, and if a harmonic voltage near the 50Hz fundamental wave is generated on the dc side, a large resonant current is generated on the dc side.
As can be seen from equation 8, the DC impedance is not only related to the inductance and resistance of the DC side, but also related to the parameter K of the controllerpAnd KiAre also closely related, so can be adjusted by adjusting KpAnd KiTo perform directional adjustment on DC impedance and ensure the stability of the systemThe dc impedance reaches a satisfactory range. The change of the dc impedance when adjusting Kp and Ki, respectively, will be described.
1) Keeping other parameters unchanged, increasing KpRespectively obtain KpThe impedance waveforms at 0.002, 0.004, 0.006, 0.008 and 0.01 are shown in FIG. 7. As can be seen from FIG. 7, KpWhen the impedance is increased, the resonance frequency point of the DC impedance is not changed, but the overall impedance value is increased, such as KpAt 0.01, the lowest impedance increases to 78 Ω or more, and K continues to increasepIn time, the dc impedance of each frequency band will further increase, and the resonant current will significantly decrease.
2) Keeping other parameters unchanged, increasing KiRespectively obtain KiThe impedance waveforms at 0.9, 0.5, 0.2, and 0.05 are shown in FIG. 8, from which FIG. 8 it can be seen that KiWhen changing, the frequency of the lowest point of resonance of the DC impedance changes, KiWhen the resonant frequency is reduced, the whole direct-current impedance curve gradually moves to the left, KiWhen the impedance is increased, the resonant frequency is increased, and the whole direct-current impedance curve is gradually shifted to the right. Both cases allow a certain increase in the impedance near the fundamental wave, e.g. KiAt 0.05, the DC loop resonant frequency is reduced to around 85rad/s, indicating that K is adjustediThe resonance frequency point of the direct current loop can be adjusted, the resonance frequency point is adjusted to the frequency range insensitive to the system, and direct current resonance is avoided.
According to the embodiment of the application, the constructed direct current impedance model replaces primary equipment such as an existing wave trap, when resonant current of different frequencies occurs to the converter, optimal design configuration of harmonic impedance of a direct current loop can be achieved only by changing parameters of the direct current impedance model, suppression of resonance of the direct current loop is achieved, flexible and wide-range adjustment of the harmonic impedance of the direct current loop is achieved, disassembly and assembly and adjustment of hardware equipment are not needed, the problem that the existing converter needs to redesign, disassemble and test the primary equipment in a mode of additionally installing the primary equipment such as the wave trap is solved, time cost and investment cost are high, the phenomenon of resonance with large variation is difficult to suppress, and the technical problem that adjustment of resonance suppression is inflexible is caused.
Meanwhile, the method saves the main equipment such as a wave trap and the like, and reduces the equipment types; the equipment investment is saved; the occupied area of equipment is reduced, and the compactness of the system is improved; the workload of operation and maintenance personnel is reduced; the system operation is prevented from being influenced by the fault of the wave trap, and the system reliability is improved; the electric energy loss on the wave trap is saved, and the system efficiency is improved.
The above is a detailed description of an embodiment of a method for suppressing dc resonance of an inverter based on control parameter modulation provided by the present application, and the following is a detailed description of a device for suppressing dc resonance of an inverter based on control parameter modulation provided by the present application.
Referring to fig. 2, an embodiment of the present application provides a dc resonance suppression device for an inverter based on control parameter modulation, including:
an electric signal obtaining module 201, configured to obtain a direct current signal output by the inverter;
and the resonance suppression module 202 is configured to determine whether the resonance current and the resonance frequency point of the inverter are within a preset normal range based on the dc signal, and if not, adjust parameters of the dc impedance model in a feedback control manner based on the dc impedance model and the dc signal input to the dc impedance model until the resonance current and the resonance frequency point are within the preset normal range.
Further, the dc impedance model is specifically:
wherein Z is the analog impedance value of the DC impedance model, Δ Vs is the small signal variation of the preset harmonic disturbance voltage, Δ IDCIs the small signal variation of the direct current, K2Is a small signal transfer function, K, of the DC output voltage and the DC output current of the converter1For small signal transfer functions of DC output voltage and firing angle control values of the converter, KPAs a proportional control coefficient, KiFor integral control coefficients, 1/S is the productAnd (4) dividing control constants.
Further, the resonance suppression module is specifically configured to:
and judging whether the resonance current and the resonance frequency point of the current converter are within a preset normal range or not based on the direct current signal, if not, adjusting the proportional control coefficient and/or the integral control coefficient of the direct current impedance model in a feedback control mode based on the direct current impedance model and the direct current signal input to the direct current impedance model until the resonance current and the resonance frequency point are within the preset normal range.
In addition, the present application also provides an embodiment of an apparatus, comprising: a memory and a controller;
the memory is used for storing program codes corresponding to the inverter direct current resonance suppression method based on control parameter modulation according to the first embodiment of the application;
the controller is used for executing the program codes.
The present application further provides an embodiment of a storage medium, in which program codes corresponding to the inverter dc resonance suppression method based on control parameter modulation according to the first embodiment of the present application are stored.
In addition, the embodiment is mainly directed to the optimization design and the dc loop resonance suppression for the harmonic impedance of the dc loop of the six-pulse high-voltage converter. The six-pulse converter can also be other types of converters such as a full-bridge or half-bridge converter, the switching device can be a thyristor or other types of controllable switches, the alternating-current side power supply can also be other power supplies such as a single-phase power supply, the voltage grade can also be a medium-voltage or low-voltage grade, the target control quantity of feedback control can also be constant voltage, constant trigger angle, constant arc-quenching angle, constant power and the like except constant current, the feedback control mode can also be a control mode such as PID, P, PD and the like except PI control, the target control quantity of current and the like can also be introduced into links such as measurement sampling and the like to be accessed into a control loop, the direct-current load can also be various types of loads such as a resistance inductance series-parallel load, a resistance capacitance series-parallel load and the like except pure resistance load R, and the situations are all regarded as the protection range of the patent.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other manners. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The terms "first," "second," "third," "fourth," and the like in the description of the application and the above-described figures, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
The above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.
Claims (8)
1. A converter direct current resonance suppression method based on control parameter modulation is characterized by comprising the following steps:
acquiring a direct current signal output by the converter;
judging whether the resonant current and the resonant frequency point of the converter are within a preset normal range or not based on the direct current signal, if not, adjusting the parameters of the direct current impedance model in a feedback control mode based on a direct current impedance model and the direct current signal input to the direct current impedance model until the resonant current and the resonant frequency point are within the preset normal range;
the direct current impedance model specifically comprises:
wherein Z is the analog impedance value of the DC impedance model, Δ VsSmall signal variation, Δ I, for a preset harmonic disturbance voltageDCIs the small signal variation of the direct current, K2Is a small signal transfer function, K, of the DC output voltage and the DC output current of the converter1The direct current output voltage of the converter and the small signal transfer function of the trigger angle control value are adopted, Kp is a proportional control coefficient, Ki is an integral control coefficient, and 1/S is an integral control constant.
2. The method according to claim 1, wherein the adjusting parameters of the dc impedance model by means of feedback control based on the dc impedance model and the dc electrical signal input to the dc impedance model until the resonant current and the resonant frequency point are within a preset normal range specifically comprises:
and adjusting a proportional control coefficient and/or an integral control coefficient of the direct current impedance model in a feedback control mode based on the direct current impedance model and the direct current signal input to the direct current impedance model until the resonance current and the resonance frequency point are within a preset normal range.
3. The inverter direct-current resonance suppression method based on control parameter modulation according to claim 1, wherein the direct-current electric signal comprises: one or more of a DC output voltage of the converter, a DC output current of the converter, and a firing angle control value of the converter.
4. The method for suppressing the converter direct-current resonance based on the control parameter modulation according to claim 1, wherein the converter specifically comprises: six-pulse current converter.
5. A converter direct current resonance suppression device based on control parameter modulation is characterized by comprising:
the electric signal acquisition module is used for acquiring the direct current signal output by the converter;
the resonance suppression module is used for judging whether the resonance current and the resonance frequency point of the current converter are within a preset normal range or not based on the direct current signal, if not, adjusting the parameters of the direct current impedance model in a feedback control mode based on the direct current impedance model and the direct current signal input to the direct current impedance model until the resonance current and the resonance frequency point are within the preset normal range;
the direct current impedance model specifically comprises:
wherein Z is the analog impedance value of the DC impedance model, Δ VsSmall signal variation, Δ I, for a preset harmonic disturbance voltageDCIs the small signal variation of the direct current, K2Is a small signal transfer function, K, of the DC output voltage and the DC output current of the converter1The direct current output voltage of the converter and the small signal transfer function of the trigger angle control value are adopted, Kp is a proportional control coefficient, Ki is an integral control coefficient, and 1/S is an integral control constant.
6. The inverter direct-current resonance suppression device based on control parameter modulation according to claim 5, wherein the resonance suppression module is specifically configured to:
and judging whether the resonant current and the resonant frequency point of the converter are within a preset normal range or not based on the direct current signal, if not, adjusting a proportional control coefficient and/or an integral control coefficient of the direct current impedance model in a feedback control mode based on the direct current impedance model and the direct current signal input to the direct current impedance model until the resonant current and the resonant frequency point are within the preset normal range.
7. An inverter direct current resonance suppression device based on control parameter modulation, comprising: a memory and a controller;
the memory is used for storing program codes corresponding to the inverter direct current resonance suppression method based on the control parameter modulation according to any one of claims 1 to 4;
the controller is configured to execute the program code.
8. A storage medium, wherein the storage medium stores program codes corresponding to the inverter direct current resonance suppression method based on control parameter modulation according to any one of claims 1 to 4.
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| CN112271913B (en) * | 2020-11-11 | 2022-03-15 | 南方电网科学研究院有限责任公司 | Method and device for calculating direct current harmonic impedance of 12-pulse current conversion system |
| CN112231935B (en) * | 2020-11-11 | 2024-05-31 | 南方电网科学研究院有限责任公司 | DC loop harmonic impedance calculation method and device of converter and computer equipment |
| CN112271733A (en) * | 2020-11-11 | 2021-01-26 | 南方电网科学研究院有限责任公司 | Harmonic suppression method for direct-current loop of 12-pulse high-voltage converter system and related device |
| CN113224760B (en) * | 2021-05-07 | 2022-04-12 | 南方电网科学研究院有限责任公司 | Parameter design method of series passive impedance adapter suitable for flexible direct current |
| CN115967112A (en) * | 2021-10-13 | 2023-04-14 | 南京南瑞继保电气有限公司 | High-voltage direct-current transmission trigger angle switching control method and control device |
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