CN113848372A - Filter bus harmonic voltage measuring method, device and system and storage medium - Google Patents
Filter bus harmonic voltage measuring method, device and system and storage medium Download PDFInfo
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Abstract
The application relates to a method, a device and a system for measuring harmonic voltage of a bus of a filter and a storage medium. The method for measuring the harmonic voltage of the filter bus comprises the following steps: obtaining the model of a filter to be tested; inquiring the RLC circuit equivalent parameters of the filter to be tested based on the model of the filter to be tested; establishing a harmonic impedance model of the filter to be tested according to the equivalent parameters of the RLC circuit; obtaining a frequency impedance curve of the filter to be tested according to the harmonic impedance model; and obtaining the bus harmonic current of the filter to be tested, and obtaining the bus harmonic voltage of the filter to be tested according to the frequency impedance curve and the bus harmonic current. The RLC circuit equivalent parameters of the alternating current filter are easy to obtain from actual power engineering operation rules, the problem that harmonic impedance modeling parameters are difficult to obtain when the capacitor voltage transformer measures harmonic voltage is solved, the harmonic impedance model of the alternating current filter is quickly established, harmonic voltage measuring efficiency is improved, and the method is suitable for measuring harmonic voltage in actual engineering.
Description
Technical Field
The present disclosure relates to the field of power harmonic measurement technologies, and in particular, to a method, an apparatus, a system, and a storage medium for measuring a harmonic voltage of a filter bus.
Background
A Capacitor Voltage Transformer (CVT) is widely used for Voltage measurement in practical power engineering due to its superior economical efficiency and safety. However, based on the specific operating principle and harmonic transfer characteristic of the capacitive voltage transformer, the capacitive voltage transformer has a structure such that it can only have a good voltage transfer characteristic within a range of 99% -101% of the fundamental frequency, and under the harmonic condition (integral multiple of the power frequency), the amplitude and phase measured by the capacitive voltage transformer have a large error, and the harmonic voltage cannot be measured correctly, so that the actual harmonic voltage of the ac filter bus cannot be obtained by using the measurement data of the capacitive voltage transformer.
The traditional solution is to structurally modify the capacitor voltage transformer at the storage to enable the capacitor voltage transformer to correctly measure the harmonic voltage when correctly measuring the fundamental voltage, but the structural modification of the capacitor voltage transformer has huge workload, and can affect the safe operation of the actual engineering, affect the economy and be unreliated. The other solution is to perform equivalent impedance modeling on the capacitor voltage transformer and then calculate to obtain the harmonic voltage, but the equivalent impedance modeling needs to obtain a large number of impedance modeling parameters, which are difficult to obtain in practice, the modeling process is complex, and the harmonic voltage calculation efficiency is low.
In the implementation process, the inventor finds that at least the following problems exist in the conventional technology:
the current method or the traditional method for measuring the bus harmonic voltage of the alternating current filter has the problems that the impedance modeling parameters are difficult to obtain and the like.
Disclosure of Invention
In view of the above, it is necessary to provide a method, an apparatus, a system and a storage medium for measuring a harmonic voltage of a filter bus, which can easily obtain impedance modeling parameters, in order to solve the above-mentioned technical problems.
In order to achieve the above object, an embodiment of the present application provides a method for measuring a bus harmonic voltage of a filter, including: obtaining the model of a filter to be tested; inquiring the RLC circuit equivalent parameters of the filter to be tested based on the model of the filter to be tested; establishing a harmonic impedance model of the filter to be tested according to the equivalent parameters of the RLC circuit; obtaining a frequency impedance curve of the filter to be tested according to the harmonic impedance model; and obtaining the bus harmonic current of the filter to be tested, and obtaining the bus harmonic voltage of the filter to be tested according to the frequency impedance curve and the bus harmonic current.
In one embodiment, the step of obtaining the model of the filter to be tested includes: acquiring a structure diagram of a filter to be tested, wherein the structure diagram of the filter to be tested comprises a connection relation between an RLC circuit element and an RLC circuit element of the filter to be tested; determining an RLC circuit equivalent diagram of the filter to be tested according to the connection relation of the RLC circuit elements; and determining the model of the filter to be tested according to the RLC circuit equivalent diagram.
In one embodiment, the step of establishing a harmonic impedance model of the filter to be tested according to the RLC circuit equivalent parameters includes: acquiring the series-parallel relation of the RLC circuits of the filter to be tested according to the RLC circuit equivalent diagram; and establishing a harmonic impedance model based on the series-parallel connection relation of the RLC circuits according to the equivalent parameters of the RLC circuits.
In one embodiment, the step of obtaining the bus harmonic voltage of the filter to be tested according to the frequency impedance curve and the bus harmonic current includes: obtaining the harmonic impedance of the filter to be tested according to the frequency impedance curve; and correspondingly multiplying the bus harmonic current and the harmonic impedance to obtain the bus harmonic voltage of the filter to be tested.
In one embodiment, the step of obtaining the bus harmonic current of the filter to be tested includes: and receiving a bus current measured value of the filter to be tested transmitted by the current transformer, and acquiring the bus harmonic current of the filter to be tested according to the bus current measured value.
In one embodiment, the harmonic impedance model is composed of an impedance model of an equivalent inductor, an impedance model of an equivalent capacitor and an impedance model of an equivalent resistor in series-parallel connection; the impedance model of the equivalent inductor is j omega l, the impedance model of the equivalent capacitor is 1/j omega C, and the impedance model of the equivalent resistor is R; the equivalent parameters of the RLC circuit comprise equivalent inductance, equivalent capacitance and equivalent resistance; wherein, L is the inductance of the equivalent inductor, C is the capacitance of the equivalent capacitor, and R is the resistance of the equivalent resistor.
A filter bus harmonic voltage measurement device, the device comprising:
the RLC circuit equivalent parameter acquisition module is used for acquiring the model of the filter to be tested; inquiring the RLC circuit equivalent parameters of the filter to be tested based on the model of the filter to be tested;
the frequency impedance curve acquisition module is used for establishing a harmonic impedance model of the filter to be tested according to the equivalent parameters of the RLC circuit; obtaining a frequency impedance curve of the filter to be tested according to the harmonic impedance model;
and the bus harmonic voltage output module is used for acquiring the bus harmonic current of the filter to be tested and outputting the bus harmonic voltage of the filter to be tested according to the frequency impedance curve and the bus harmonic current.
In one embodiment, the apparatus further comprises: the structure diagram acquisition module is used for acquiring a structure diagram of the filter to be tested, wherein the structure diagram of the filter to be tested comprises an RLC circuit element of the filter to be tested and a connection relation of the RLC circuit element; determining an RLC circuit equivalent diagram of the filter to be tested according to the connection relation of the RLC circuit elements; and determining the model of the filter to be tested according to the RLC circuit equivalent diagram.
A filter bus harmonic voltage measurement system comprising:
the filter to be tested is connected with the bus;
the current transformer is connected with the bus and used for acquiring the bus harmonic current of the filter to be tested;
the computer equipment is respectively connected with the filter to be tested and the current transformer; the computer device comprises a memory storing a computer program and a processor implementing the steps of the method described above when executing the computer program.
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 above-mentioned method.
One of the above technical solutions has the following advantages and beneficial effects:
the method comprises the steps that the RLC circuit equivalent parameters of the alternating current filter are easy to obtain from actual power engineering operation regulations, a harmonic impedance model is built for the filter to be tested through the RLC circuit equivalent parameters of the filter to be tested, and then the harmonic voltage of a bus of the alternating current filter is obtained by combining bus harmonic current of the filter to be tested. The problem that harmonic impedance modeling parameters are difficult to obtain when the capacitor voltage transformer measures harmonic voltage is solved, in addition, the RLC circuit equivalent parameters of the alternating current filter are few, harmonic impedance modeling can be performed rapidly, and therefore harmonic voltage measuring efficiency is improved, and the method is suitable for measuring harmonic voltage in practical engineering.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments or the conventional technologies of the present application, the drawings used in the descriptions of the embodiments or the conventional technologies will be briefly introduced below, it is obvious that the drawings in the following descriptions are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic flow chart diagram of a method for measuring harmonic voltage of a filter bus in one embodiment;
FIG. 2 is an RLC circuit equivalent of a type B double tuned filter in one embodiment;
FIG. 3 is a graph of the frequency impedance of a B-mode double tuned filter in one embodiment;
FIG. 4 is a schematic flow chart of a method for measuring harmonic voltage of a bus of a filter according to another embodiment;
FIG. 5 is a block diagram of a type B double tuned filter in one embodiment;
FIG. 6 is a schematic diagram of a filter bus harmonic voltage measurement system in one embodiment.
Detailed Description
To facilitate an understanding of the present application, the present application will now be described more fully with reference to the accompanying drawings. Embodiments of the present application are set forth in the accompanying drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
It will be understood that, as used herein, the terms "first," "second," and the like may be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another.
Spatial relational terms, such as "under," "below," "under," "over," and the like may be used herein to describe one element or feature's relationship to another element or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements or features described as "below" or "beneath" other elements or features would then be oriented "above" the other elements or features. Thus, the exemplary terms "under" and "under" can encompass both an orientation of above and below. In addition, the device may also include additional orientations (e.g., rotated 90 degrees or other orientations) and the spatial descriptors used herein interpreted accordingly.
It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or be connected to the other element through intervening elements. Further, "connection" in the following embodiments is understood to mean "electrical connection", "communication connection", or the like, if there is a transfer of electrical signals or data between the connected objects.
As used herein, the singular forms "a", "an" and "the" may include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises/comprising," "includes" or "including," etc., specify the presence of stated features, integers, steps, operations, components, parts, or combinations thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof. Also, as used in this specification, the term "and/or" includes any and all combinations of the associated listed items.
At present, a method for obtaining a harmonic voltage of a capacitor voltage transformer by constructing an equivalent impedance model of the capacitor voltage transformer needs to obtain a large amount of impedance modeling parameters, which include: the capacitance voltage transformer comprises a high-voltage side capacitor, a medium-voltage side capacitor, a compensation reactor inductor, a compensation reactor equivalent resistor, a compensation reactor equivalent stray capacitor, an intermediate transformer excitation resistor, an intermediate transformer excitation inductor, a winding resistor on the primary side of the intermediate transformer, a winding leakage inductance on the primary side of the intermediate transformer, a winding resistor on the secondary side of the intermediate transformer, a winding leakage inductance on the secondary side of the intermediate transformer, a primary winding to ground stray capacitor, a secondary winding to ground stray capacitor, a coupling capacitor between windings on the primary side and the secondary side, a damper equivalent resistor, a damper equivalent inductor and the like. The invention utilizes the RLC circuit equivalent parameters of the alternating current filter to establish a harmonic impedance model of the alternating current filter, and further measures the harmonic voltage of the bus of the alternating current filter.
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
The embodiment of the application provides a method for measuring the harmonic voltage of a filter bus, as shown in fig. 1, comprising the following steps:
s110, acquiring the model of the filter to be tested; inquiring the RLC circuit equivalent parameters of the filter to be tested based on the model of the filter to be tested;
in particular, the followingThe filter model may include: single-tuned filter, double-tuned filter, triple-tuned filter, single-tuned damping filter, double-tuned damping filter, triple-tuned damping filter, and the like; the RLC circuit equivalent parameters of the filter to be tested comprise an equivalent inductance of the filter to be tested, an equivalent capacitance of the filter to be tested and an equivalent resistance of the filter to be tested; in some examples, the RLC circuit equivalent parameter of the filter to be tested may be obtained by querying from an actual power engineering operation specification according to a model, and in an actual dc engineering, each converter station has a corresponding operation specification, for example, "± 500 kV", a converter station operation specification of the dc transmission system from cattle village (2018 edition); the equivalent capacitance of the filter to be tested is obtained according to the capacitance value of a capacitance element (such as a capacitor bank) in the filter to be tested; the equivalent inductance of the filter to be tested is obtained according to the inductance value of an inductance element (such as a reactor) in the filter to be tested; the equivalent resistance of the filter to be tested is obtained according to the resistance value of a resistance element (for example, a resistor) in the filter to be tested; the RLC circuit equivalent parameters of the filter to be tested can also be obtained according to the capacitance, inductance and resistance values of all elements (including any one or more of a capacitor, an inductor and a resistor) in the filter to be tested; in some examples, as shown in fig. 2, the model of the filter to be tested is obtained as a B-type double-tuned filter, and the equivalent parameter of the filter to be tested includes C obtained by equivalence of the capacitor bank1And C2L obtained by reactor equivalent1And L2And R obtained by resistor equivalence1(ii) a Inquiring the RLC circuit equivalent parameter of the filter to be tested as C based on the model of the filter to be tested1＝1.842μF，C2＝3.320μF，L1＝7.29mH，L2＝10.495mH(C1、C2、L1、L2All are per phase values), R1500Q, as shown in the table below:
| model number | Capacitor bank | Capacitance per phase (μ F) | |
| B-type double-tuned filter | C1 | 1.842 | |
| B-type double-tuned filter | C2 | 3.320 | |
| Model number | Electric reactor | Inductance value/phase (mH) | |
| B-type double-tuned filter | L1 | 7.29 | |
| B-type double-tuned filter | L2 | 10.495 | |
| Model number | Resistor with a resistor element | Total resistance value (omega) | |
| B-type double-tuned | R | 1 | 500 |
S120, establishing a harmonic impedance model of the filter to be tested according to the equivalent parameters of the RLC circuit; obtaining a frequency impedance curve of the filter to be tested according to the harmonic impedance model;
specifically, the harmonic impedance model of the filter to be tested comprises an impedance model of an equivalent inductor, an impedance model of an equivalent capacitor and an impedance model of an equivalent resistor; in some examples, the impedance model of the equivalent inductance is j ω L, the impedance model of the equivalent capacitance is 1/j ω C, and the impedance model of the equivalent resistance is R; wherein, L is the inductance value of the equivalent inductor, C is the capacitance value of the equivalent capacitor, and R is the resistance value of the equivalent resistor; in some examples, as shown in FIG. 2, according to C1、C2、L1、L2And R1The harmonic impedance model of the B-type double-tuned filter is established as follows:
in the formula, ZfAnd j is an imaginary number unit, and omega is an angular velocity. The harmonic impedance model is built only by a small number of equivalent parameters of the filter to be tested (for example, the B-type double-tuned filter only needs C1、C2、L1、L2And R1Five element parameters) can be rapidly carried out harmonic impedance modeling, thereby improving the harmonic voltage measurement efficiency.
Specifically, the frequency impedance curve of the filter to be tested is a relationship curve of the frequency of the filter to be tested and impedances at different frequencies; in some examples, as shown in FIG. 3, according to C1、C2、L1、L2And R1After a harmonic impedance model of a B-type double-tuned filter (RLC passive filter) is established, according to the harmonic impedance model, a frequency impedance curve of the filter to be tested is obtained, wherein the frequency impedance curve comprises impedance amplitude values and impedance phases of the filter to be tested under different frequencies;
s130, obtaining the bus harmonic current of the filter to be tested, and obtaining the bus harmonic voltage of the filter to be tested according to the frequency impedance curve and the bus harmonic current.
Specifically, the bus harmonic current of the filter to be tested can be obtained according to the bus current measurement value of the filter to be tested; the bus current measured value of the filter to be measured can be measured by a current transformer connected with a bus; according to the frequency impedance curve, the harmonic impedance of the filter to be tested can be obtained; obtaining the bus harmonic voltage of the filter to be tested according to the harmonic impedance and the bus harmonic current of the filter to be tested; in some examples, obtaining a bus harmonic current of a filter to be tested (a B-type double-tuned filter), and obtaining a harmonic impedance of the B-type double-tuned filter according to a frequency impedance curve of the B-type double-tuned filter; and obtaining the bus harmonic voltage of the B-type double-tuned filter according to the harmonic impedance and the bus harmonic current of the B-type double-tuned filter. The RLC circuit equivalent parameters of the filter to be measured are easy to obtain from the practical power engineering operation rules, the problem that harmonic impedance modeling parameters are difficult to obtain when the capacitor voltage transformer measures harmonic voltage is solved, and the method is suitable for measuring the harmonic voltage in practical engineering.
In one embodiment, the step of obtaining the model of the filter to be tested includes: acquiring a structure diagram of a filter to be tested, wherein the structure diagram of the filter to be tested comprises a connection relation between an RLC circuit element and an RLC circuit element of the filter to be tested; determining an RLC circuit equivalent diagram of the filter to be tested according to the connection relation of the RLC circuit elements; and determining the model of the filter to be tested according to the RLC circuit equivalent diagram.
Specifically, the structure diagram of the filter to be tested may be a circuit diagram of the filter to be tested, or may be a schematic circuit diagram of the filter to be tested; the RLC circuit elements of the filter under test include capacitive elements (e.g., capacitor banks), inductive elements (e.g., reactors), and resistive elements (e.g., resistors); the connection relationships of the RLC circuit elements may include a series relationship, a parallel relationship and a series-parallel relationship; the RLC circuit equivalent diagram of the filter to be tested is an equivalent simplified circuit of the structure diagram of the filter to be tested (equivalent parameters can be obtained from actual power engineering operation regulations); the standard RLC circuit equivalent diagram can be preset, the corresponding relation between the standard RLC circuit equivalent diagram and the model of the filter to be tested is established, the same preset standard RLC circuit equivalent diagram is selected according to the comparison between the RLC circuit equivalent diagram and the preset standard RLC circuit equivalent diagram, and the model of the filter to be tested is determined according to the corresponding relation. Determining the model of the filter under test may include: the bus harmonic voltage of the alternating current filter of each model can be further obtained.
In one example, as shown in fig. 4, a structure diagram of an ac filter (filter to be tested) is obtained, and an RLC circuit parameter of the ac filter (RLC circuit equivalent parameter of the filter to be tested) is obtained according to the structure diagram of the ac filter; establishing a harmonic impedance model of the alternating current filter according to the RLC circuit parameters of the alternating current filter; obtaining an alternating current filter frequency impedance curve according to the harmonic impedance model; and obtaining the bus harmonic current of the alternating current filter, and obtaining the bus harmonic voltage of the alternating current filter according to the frequency impedance curve of the alternating current filter and the bus harmonic current of the alternating current filter.
It should be understood that although the steps in the flowcharts of fig. 1 and 4 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 some of the steps in fig. 1 and 4 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 performing the sub-steps or stages is not necessarily sequential, but may be performed alternately or alternately with other steps or at least some of the sub-steps or stages of other steps.
In one example, as shown in FIG. 5, a block diagram of a filter under test is shown, wherein the RLC circuit element includes C11、C12、C13、C14、C21、C22、L1、L2And R1The RLC circuit of the filter under test as shown in FIG. 2 is determined based on the connection relationship of the RLC circuit elements as shown in FIG. 5A road equivalent diagram, wherein C1Is C11、C12、C13And C14Equivalent capacitance of C2Is C21And C22The equivalent capacitance of (2); and according to the comparison of the RLC circuit equivalent diagram and a preset standard RLC circuit equivalent diagram, determining that the model of the filter to be tested is the B-type double-tuned filter, wherein the RLC circuit equivalent diagram is the same as the preset standard RLC circuit equivalent diagram of the B-type double-tuned filter.
The type of the alternating current filter is obtained through the structure diagram of the alternating current filter, RLC circuit equivalent parameters of the alternating current filter are further obtained, a harmonic impedance model of the alternating current filter is established according to the RLC circuit equivalent parameters, and bus harmonic current of the alternating current filter is combined, so that bus harmonic voltage of the alternating current filter is obtained. The problem of impedance modeling parameter acquisition difficulty is solved, harmonic voltage measurement efficiency is improved, and the method is suitable for harmonic voltage calculation in practical engineering.
In one embodiment, the step of establishing a harmonic impedance model of the filter to be tested according to the RLC circuit equivalent parameters includes: acquiring the series-parallel relation of the RLC circuits of the filter to be tested according to the RLC circuit equivalent diagram; and establishing a harmonic impedance model based on the series-parallel connection relation of the RLC circuits according to the equivalent parameters of the RLC circuits.
Specifically, the series-parallel relationship of the RLC circuit of the filter to be tested is the series-parallel relationship of the RLC circuit equivalent element, and may include a series relationship, a parallel relationship and a series-parallel relationship; the RLC circuit equivalent parameters correspond to the RLC circuit equivalent elements one by one; in some examples, the impedance model of the equivalent inductance is j ω L, the impedance model of the equivalent capacitance is 1/j ω c, and the impedance model of the equivalent resistance is R; wherein, L is the inductance value of the equivalent inductor, c is the capacitance value of the equivalent capacitor, and R is the resistance value of the equivalent resistor;
in one embodiment, the step of obtaining the bus harmonic voltage of the filter to be tested according to the frequency impedance curve and the bus harmonic current includes: obtaining the harmonic impedance of the filter to be tested according to the frequency impedance curve; and correspondingly multiplying the bus harmonic current and the harmonic impedance to obtain the bus harmonic voltage of the filter to be tested.
Specifically, the frequency impedance curve includes harmonic impedances under each harmonic of the filter to be measured; in one example, as shown in fig. 3, the harmonic impedance of the filter to be tested from the fundamental wave to the 25 th harmonic can be obtained according to the frequency impedance curve of the B-type double tuned filter; and correspondingly multiplying the bus harmonic current and the harmonic impedance to obtain the bus harmonic voltage of the filter to be tested, for example, correspondingly multiplying the 3 rd bus harmonic current and the 3 rd harmonic impedance to obtain the 3 rd bus harmonic voltage of the B-type double-tuned filter.
In one embodiment, the step of obtaining the bus harmonic current of the filter to be tested includes: and receiving a bus current measured value of the filter to be tested transmitted by the current transformer, and acquiring the bus harmonic current of the filter to be tested according to the bus current measured value.
Specifically, a bus current measurement value is obtained by measuring through a current transformer connected with a bus, and the bus harmonic current of the filter to be measured can be obtained by processing the bus current measurement value; in one example, the bus current measurement value can be processed in a fourier transform decomposition mode to obtain the bus harmonic current of the filter to be tested. The method comprises the steps of establishing a harmonic impedance model of the alternating current filter according to RLC circuit equivalent parameters, combining bus harmonic current of the alternating current filter obtained through a current transformer to obtain bus harmonic voltage of the alternating current filter, solving the problem that impedance modeling parameters are difficult to obtain by using the RLC circuit equivalent parameters and the bus harmonic current of the alternating current filter, improving harmonic voltage measurement efficiency, and being suitable for harmonic voltage calculation in practical engineering.
In one embodiment, the harmonic impedance model is composed of an impedance model of an equivalent inductor, an impedance model of an equivalent capacitor and an impedance model of an equivalent resistor in series-parallel connection; the impedance model of the equivalent inductor is j omega L, the impedance model of the equivalent capacitor is 1/j omega C, and the impedance model of the equivalent resistor is R; the equivalent parameters of the RLC circuit comprise equivalent inductance, equivalent capacitance and equivalent resistance; wherein, L is the inductance of the equivalent inductor, C is the capacitance of the equivalent capacitor, and R is the resistance of the equivalent resistor.
Specifically, series impedance models are directly added, and parallel impedance models areAdding the inverses of the impedance models and then making the inverses; in some examples, as shown in fig. 2, in a B-mode double tuned filter, the impedance model of the equivalent inductance is j ω L1And j ω L2The impedance model of the equivalent capacitance is 1/j omega C1And 1/j ω C2The impedance model of the equivalent resistance is R1，jωL1And 1/j ω C1Connected in series to obtain an upper branch, j omega L2、1/jωC2And R1And connecting the upper branch and the lower branch in series to obtain a harmonic impedance model of the B-type double-tuned filter as follows:
in the formula, ZfAnd j is an imaginary number unit, and omega is an angular velocity.
The embodiment of the application provides a wave filter busbar harmonic voltage measuring device, and the device includes:
the RLC circuit equivalent parameter acquisition module is used for acquiring the model of the filter to be tested; inquiring the RLC circuit equivalent parameters of the filter to be tested based on the model of the filter to be tested;
the frequency impedance curve acquisition module is used for establishing a harmonic impedance model of the filter to be tested according to the equivalent parameters of the RLC circuit; obtaining a frequency impedance curve of the filter to be tested according to the harmonic impedance model;
and the bus harmonic voltage output module is used for acquiring the bus harmonic current of the filter to be tested and outputting the bus harmonic voltage of the filter to be tested according to the frequency impedance curve and the bus harmonic current.
In one embodiment, the apparatus further comprises: the structure diagram acquisition module is used for acquiring a structure diagram of the filter to be tested, wherein the structure diagram of the filter to be tested comprises an RLC circuit element of the filter to be tested and a connection relation of the RLC circuit element; determining an RLC circuit equivalent diagram of the filter to be tested according to the connection relation of the RLC circuit elements; and determining the model of the filter to be tested according to the RLC circuit equivalent diagram.
In one embodiment, the frequency impedance curve obtaining module obtains the series-parallel relation of the RLC circuits of the filter to be tested according to the RLC circuit equivalent diagram; and establishing a harmonic impedance model based on the series-parallel connection relation of the RLC circuits according to the equivalent parameters of the RLC circuits.
In one embodiment, the bus harmonic voltage output module obtains the harmonic impedance of the filter to be tested according to a frequency impedance curve; and correspondingly multiplying the bus harmonic current and the harmonic impedance to obtain the bus harmonic voltage of the filter to be tested.
In one embodiment, the bus harmonic voltage output module receives a bus current measured value of the filter to be tested transmitted by the current transformer, and obtains the bus harmonic current of the filter to be tested according to the bus current measured value.
In one embodiment, the harmonic impedance model established by the frequency impedance curve acquisition module is composed of an impedance model of an equivalent inductor, an impedance model of an equivalent capacitor and an impedance model of an equivalent resistor in series-parallel connection; the impedance model of the equivalent inductor is j omega L, the impedance model of the equivalent capacitor is 1/j omega C, and the impedance model of the equivalent resistor is R; the equivalent parameters of the RLC circuit comprise equivalent inductance, equivalent capacitance and equivalent resistance; wherein, L is the inductance of the equivalent inductor, C is the capacitance of the equivalent capacitor, and R is the resistance of the equivalent resistor.
For specific limitations of the filter bus harmonic voltage measurement device, reference may be made to the above limitations of the filter bus harmonic voltage measurement method, and details are not repeated here. All or part of each module in the filter bus harmonic voltage measuring device 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. It should be noted that, in the embodiment of the present application, the division of the module is schematic, and is only one logic function division, and there may be another division manner in actual implementation.
The embodiment of the present application provides a filter bus harmonic voltage measurement system, as shown in fig. 6, including:
the filter to be tested 610, wherein the filter to be tested 610 is connected with the bus;
the current transformer 620 is connected with the bus and used for acquiring the bus harmonic current of the filter 610 to be tested;
the computer device 630, the computer device 630 is respectively connected with the filter to be tested 610 and the current transformer 620; the computer device 630 comprises a memory storing a computer program and a processor implementing the steps of the method described above when the processor executes the computer program.
In one embodiment, a computer device is provided, which may be a server. 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 device is used for storing the harmonic voltage measurement data of the filter bus. 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 filter bus harmonic voltage measurement method.
In one embodiment, a computer device is provided, which may be a terminal. The computer device includes a processor, a memory, a network interface, a display screen, and an input device 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 and a computer program. The internal memory provides an environment for the operation of an operating system and computer programs in the non-volatile storage medium. 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 filter bus harmonic voltage measurement method. The display screen of the computer equipment can be a liquid crystal display screen or an electronic ink display screen, and the input device of the computer equipment can be a touch layer covered on the display screen, a key, a track ball or a touch pad arranged on the shell of the computer equipment, an external keyboard, a touch pad or a mouse and the like.
Those skilled in the art will appreciate that the architecture shown in fig. 6 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.
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 above-mentioned method.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware instructions of a computer program, which can be stored in a non-volatile computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. Any reference to memory, storage, database or other medium used in the embodiments provided herein can include at least one of non-volatile and volatile memory. Non-volatile Memory may include Read-Only Memory (ROM), magnetic tape, floppy disk, flash Memory, optical storage, or the like. Volatile Memory can include Random Access Memory (RAM) or external cache Memory. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM), for example.
In the description herein, references to the description of "some embodiments," "other embodiments," "desired embodiments," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, a schematic description of the above terminology may not necessarily refer to the same embodiment or example.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A method for measuring the harmonic voltage of a bus of a filter is characterized in that,
obtaining the model of a filter to be tested; inquiring the RLC circuit equivalent parameters of the filter to be tested based on the model of the filter to be tested;
establishing a harmonic impedance model of the filter to be tested according to the RLC circuit equivalent parameters; obtaining a frequency impedance curve of the filter to be tested according to the harmonic impedance model;
and obtaining the bus harmonic current of the filter to be tested, and obtaining the bus harmonic voltage of the filter to be tested according to the frequency impedance curve and the bus harmonic current.
2. The method for measuring the harmonic voltage of the bus of the filter according to claim 1, wherein the step of obtaining the model of the filter to be measured comprises the steps of:
acquiring a structure diagram of the filter to be tested, wherein the structure diagram of the filter to be tested comprises a connection relation between an RLC circuit element of the filter to be tested and the RLC circuit element; determining an RLC circuit equivalent diagram of the filter to be tested according to the connection relation of the RLC circuit elements; and determining the model of the filter to be tested according to the RLC circuit equivalent diagram.
3. The method for measuring harmonic voltage of a filter bus according to claim 2, wherein the step of establishing a harmonic impedance model of the filter to be measured according to the RLC circuit equivalent parameters comprises:
acquiring the serial-parallel connection relation of the RLC circuits of the filter to be tested according to the RLC circuit equivalent diagram; and establishing the harmonic impedance model based on the series-parallel connection relation of the RLC circuits according to the RLC circuit equivalent parameters.
4. The method for measuring the harmonic voltage of the filter bus according to claim 1, wherein the step of obtaining the harmonic voltage of the filter to be measured according to the frequency impedance curve and the bus harmonic current comprises:
obtaining the harmonic impedance of the filter to be tested according to the frequency impedance curve; and correspondingly multiplying the bus harmonic current and the harmonic impedance to obtain the bus harmonic voltage of the filter to be tested.
5. The method for measuring the harmonic voltage of the filter bus according to claim 1, wherein the step of obtaining the harmonic current of the filter bus to be measured comprises:
and receiving a bus current measured value of the filter to be tested transmitted by the current transformer, and acquiring the bus harmonic current of the filter to be tested according to the bus current measured value.
6. The filter bus harmonic voltage measurement method of claim 1,
the harmonic impedance model is formed by connecting an impedance model of an equivalent inductor, an impedance model of an equivalent capacitor and an impedance model of an equivalent resistor in series and parallel; the impedance model of the equivalent inductor is j omega L, the impedance model of the equivalent capacitor is 1/j omega C, and the impedance model of the equivalent resistor is R; the RLC circuit equivalent parameters comprise the equivalent inductance, the equivalent capacitance and the equivalent resistance; wherein, L is an inductance value of the equivalent inductor, C is a capacitance value of the equivalent capacitor, and R is a resistance value of the equivalent resistor.
7. A filter bus harmonic voltage measurement device, the device comprising:
the RLC circuit equivalent parameter acquisition module is used for acquiring the model of the filter to be tested; inquiring the RLC circuit equivalent parameters of the filter to be tested based on the model of the filter to be tested;
the frequency impedance curve acquisition module is used for establishing a harmonic impedance model of the filter to be tested according to the RLC circuit equivalent parameters; obtaining a frequency impedance curve of the filter to be tested according to the harmonic impedance model;
and the bus harmonic voltage output module is used for acquiring the bus harmonic current of the filter to be tested and outputting the bus harmonic voltage of the filter to be tested according to the frequency impedance curve and the bus harmonic current.
8. The filter bus harmonic voltage measurement device of claim 7, further comprising:
the structure diagram acquisition module is used for acquiring a structure diagram of the filter to be tested, wherein the structure diagram of the filter to be tested comprises a connection relation between an RLC circuit element of the filter to be tested and the RLC circuit element; determining an RLC circuit equivalent diagram of the filter to be tested according to the connection relation of the RLC circuit elements; and determining the model of the filter to be tested according to the RLC circuit equivalent diagram.
9. A filter bus harmonic voltage measurement system, comprising:
the filter to be tested is connected with the bus;
the current transformer is connected with the bus and used for acquiring bus harmonic current of the filter to be tested;
the computer equipment is respectively connected with the filter to be tested and the current transformer; the computer device comprises a memory storing a computer program and a processor implementing the steps of the method of any of claims 1 to 6 when executing the computer program.
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 of any one of claims 1 to 6.
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