CN113884791B - Power quality evaluation device, power quality evaluation method, power distribution system and storage medium - Google Patents
Power quality evaluation device, power quality evaluation method, power distribution system and storage medium Download PDFInfo
- Publication number
- CN113884791B CN113884791B CN202111127804.4A CN202111127804A CN113884791B CN 113884791 B CN113884791 B CN 113884791B CN 202111127804 A CN202111127804 A CN 202111127804A CN 113884791 B CN113884791 B CN 113884791B
- Authority
- CN
- China
- Prior art keywords
- direct current
- component
- signal
- converter
- fundamental
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000013441 quality evaluation Methods 0.000 title claims abstract description 43
- 238000000034 method Methods 0.000 title claims abstract description 20
- 238000012545 processing Methods 0.000 claims abstract description 24
- 230000001629 suppression Effects 0.000 claims description 24
- 238000001514 detection method Methods 0.000 claims description 10
- 238000004146 energy storage Methods 0.000 claims description 8
- 230000005764 inhibitory process Effects 0.000 claims description 8
- 238000010248 power generation Methods 0.000 claims description 8
- 238000004590 computer program Methods 0.000 claims description 6
- 238000001303 quality assessment method Methods 0.000 claims 2
- 230000005540 biological transmission Effects 0.000 description 4
- 230000007935 neutral effect Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000007796 conventional method Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R21/00—Arrangements for measuring electric power or power factor
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
The invention relates to an electric energy quality evaluation device, an electric energy quality evaluation method, an electric distribution system and a storage medium, wherein the electric energy quality evaluation device acquires an alternating current signal of an alternating current side of an AC/DC converter through a signal acquisition module, acquires at least one of a first direct current signal of a direct current side of the AC/DC converter, a second direct current signal of a high voltage side of the first DC/DC converter and a third direct current signal of a high voltage side of the second DC/DC converter, analyzes by an analysis module to obtain an alternating current fundamental wave component, an alternating current harmonic wave component and a direct current fundamental wave component, and a direct current harmonic wave component, and finally obtains a distortion ratio by a processing module according to the alternating current fundamental wave component, the alternating current harmonic wave component, the direct current fundamental wave component and the direct current harmonic wave component, and obtains an electric energy quality evaluation result of the direct current matched electric equipment according to the distortion ratio.
Description
Technical Field
The present invention relates to the field of power transmission technologies, and in particular, to an apparatus and a method for evaluating power quality, a power distribution system, and a storage medium.
Background
Traditional AC distribution equipment faces a series of problems such as high line loss, power quality disturbance, voltage drop and the like, and is difficult to meet the increasing power demands of power consumers. Compared with an alternating current power distribution network, the direct current power supply effectively solves the power quality problems of harmonic waves, unbalanced three phases and the like. With the continuous penetration of new energy application and the increasing maturity of power electronic technology, direct current power distribution equipment is coming to develop in the golden period.
Compared with the existing mature electric energy quality evaluation method of the traditional alternating current power distribution equipment, the electric energy quality evaluation method of the alternating current power distribution equipment is not applicable due to the fact that the structure and parameters of the direct current power distribution equipment are changed, and therefore a method for evaluating the electric energy quality of the direct current power distribution equipment is urgently needed.
Disclosure of Invention
Based on the above, it is necessary to provide a power quality evaluation device, a power quality evaluation method, a power distribution system, and a storage medium for evaluating the power quality of a dc power distribution device
The utility model provides an electric energy quality evaluation device for direct current joins in marriage the consumer, direct current joins in marriage the consumer and includes distributed energy power generation facility, energy storage device, charging device, AC/DC converter, first DC/DC converter and second DC/DC converter, AC/DC converter is connected with alternating current power distribution cabinet and direct current network respectively, first DC/DC converter respectively with distributed energy power generation facility and direct current network connection, second DC/DC converter respectively with energy storage device with direct current network connection, charging device is connected with direct current network connection, electric energy quality detection device includes:
the signal acquisition module is used for
Collecting alternating current signals of an alternating current side of an AC/DC converter;
collecting at least one of a first direct current signal of a direct current side of the AC/DC converter, a second direct current signal of a high voltage side of the first DC/DC converter and a third direct current signal of a high voltage side of the second DC/DC converter;
the analysis module is connected with the signal acquisition module and is used for analyzing the alternating current signal to obtain an alternating current fundamental component and an alternating current harmonic component and analyzing at least one of the first direct current signal, the second direct current signal and the third direct current signal to obtain a direct current fundamental component and a direct current harmonic component;
the processing module is connected with the analysis module and used for obtaining a distortion rate suppression ratio according to the alternating current fundamental wave component, the alternating current harmonic wave component, the direct current fundamental wave component and the direct current harmonic wave component and obtaining a power quality evaluation result of the direct current power distribution equipment according to the distortion rate suppression ratio.
In one embodiment, the ac fundamental component includes an ac voltage fundamental component, the ac harmonic component includes an ac voltage harmonic component, the dc fundamental component includes a dc voltage fundamental component, and the dc harmonic component includes a dc voltage harmonic component, and the processing module is configured to obtain the distortion suppression ratio according to the ac voltage fundamental component, the ac voltage harmonic component, the dc voltage fundamental component, and the dc voltage harmonic component.
In one embodiment, the ac fundamental component includes an ac current fundamental component, the ac harmonic component includes an ac current harmonic component, the dc fundamental component includes a dc current fundamental component, the dc harmonic component includes a dc current harmonic component, and the processing module is configured to obtain the distortion suppression ratio from the ac current fundamental component, the ac current harmonic component, the dc current fundamental component, and the dc current harmonic component.
In one of the embodiments of the present invention,
the signal acquisition module acquires at least the first direct current signal;
the analysis module is also used for
Determining whether the first direct current signal is lost;
and if the first direct current signal is not lost, analyzing the first direct current signal to obtain the direct current fundamental component and the direct current harmonic component.
In one of the embodiments of the present invention,
and if the first direct current signal is lost, the analysis module analyzes the second direct current signal or the third direct current signal to obtain the direct current fundamental wave component and the direct current harmonic component.
In one embodiment, the analysis module may include a power quality analyzer or a power analyzer.
In one embodiment, the power analyzer includes a signal detection module, and the signal acquisition module and the signal detection module are the same module.
A power distribution system, comprising:
direct current power distribution equipment; and
the above-described power quality evaluation device.
A method for evaluating the quality of electric energy, which is applied to direct-current power distribution equipment, the method comprising:
acquiring an alternating current signal of an alternating current side of an AC/DC converter;
acquiring at least one of a first direct current signal of a direct current side of the AC/DC converter, a second direct current signal of a high voltage side of the first DC/DC converter and a third direct current signal of a high voltage side of the second DC/DC converter;
analyzing the alternating current signal to obtain an alternating current fundamental component and an alternating current harmonic component, and analyzing at least one of the first direct current signal, the second direct current signal and the third direct current signal to obtain a direct current fundamental component and a direct current harmonic component;
and acquiring a distortion ratio inhibition ratio according to the alternating-current fundamental wave component, the alternating-current harmonic wave component, the direct-current fundamental wave component and the direct-current harmonic wave component, and acquiring an electric energy quality evaluation result of the direct-current power distribution equipment according to the distortion ratio inhibition ratio.
A computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of the method as claimed in claim 9.
The power quality evaluation device is characterized in that a signal acquisition module acquires an alternating current signal of an alternating current side of an AC/DC converter, and acquires at least one of a first direct current signal of a direct current side of the AC/DC converter, a second direct current signal of a high voltage side of the first DC/DC converter and a third direct current signal of a high voltage side of the second DC/DC converter, and then an analysis module is utilized to analyze the alternating current signal to obtain an alternating current fundamental component and an alternating current harmonic component, and at least one of the first direct current signal, the second direct current signal and the third direct current signal is analyzed to obtain a direct current fundamental component and a direct current harmonic component; and finally, the processing module acquires a distortion ratio inhibition ratio according to the alternating-current fundamental component, the alternating-current harmonic component, the direct-current fundamental component and the direct-current harmonic component, and acquires an electric energy quality evaluation result of the direct-current power distribution equipment according to the distortion ratio inhibition ratio.
Drawings
In order to more clearly illustrate the technical solutions of embodiments or conventional techniques of the present application, the drawings required for the descriptions of the embodiments or conventional techniques will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person of ordinary skill in the art.
FIG. 1 is a schematic structural diagram of a DC power distribution device according to an embodiment;
FIG. 2 is a block diagram of an apparatus for evaluating power quality according to an embodiment;
fig. 3 is a flow chart of a power quality evaluation method according to an embodiment.
Detailed Description
In order to facilitate an understanding of the present application, a more complete description of the present application will now be provided with reference to the relevant figures. Examples of the present application are given in the accompanying drawings. This application may, however, be embodied in many different forms and is not limited to the embodiments described 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 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 the terms "first," "second," and the like, as used herein, may be used to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another element. For example, a first direct current signal may be referred to as a second direct current signal, and similarly, a second direct current signal may be referred to as a first direct current signal, without departing from the scope of the present application. Both the first direct current signal and the second direct current signal are direct current signals, but they are not the same direct current signal.
It is to be understood that in the following embodiments, "connected" is understood to mean "electrically connected", "communicatively connected", etc., if the connected circuits, modules, units, etc., have electrical or data transfer between them.
As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," and/or the like, specify the presence of stated features, integers, steps, operations, elements, components, or groups thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or groups thereof. Also, the term "and/or" as used in this specification includes any and all combinations of the associated listed items.
Fig. 1 is a block diagram of a DC power distribution device according to an embodiment, as shown in fig. 1, the DC power distribution device includes a distributed energy power generation device 110, an energy storage device 120, a charging device 130, an AC/DC converter 140, a first DC/DC converter 150 and a second DC/DC converter 160, where the AC/DC converter 140 is connected to an AC power distribution cabinet 170 and a DC network 180, respectively, and a side connected to the AC power distribution cabinet 170 is an AC side and a side connected to the DC network 180 is a DC side; the first DC/DC converter 150 is connected to the distributed energy power generation device 110 and the direct current network 180, respectively, wherein a side connected to the distributed energy power generation device 110 is a low voltage side, and a side connected to the direct current network 180 is a high voltage side; the second DC/DC converter 160 is connected to the energy storage device 120 and the DC network 180, respectively, wherein a side connected to the energy storage device 120 is a low voltage side, and a side connected to the DC network 180 is a high voltage side; the charging device 130 is connected to the dc network 180. The AC/DC converter 140 is configured to rectify three-phase AC power of the AC power distribution cabinet 170 into DC power and transmit the DC power to the DC network 180, the first DC/DC converter 150 is configured to boost the DC power of the distributed energy power generation device 110 and transmit the boosted DC power to the DC network 180, and the second DC/DC converter 160 is configured to boost the DC power of the energy storage device 120 and transmit the boosted DC power to the DC network 180.
The DC network 180 includes the live line 11 and the neutral line 10, and the output ends of the ac/DC converter 140, the first DC/DC converter 150, the second DC/DC converter 160, and the charging device 130 include two connection ends, where the two connection ends are respectively connected to the live line 11 and the neutral line 10 in a one-to-one correspondence. A switch S1 may be disposed between the first DC/DC converter 150 and the DC network 180, a switch S2 may be disposed between the second DC/DC converter 160 and the DC network 180, a switch S3 may be disposed between the charging device 130 and the DC network 180, a switch S4 may be disposed between the AC/DC converter 140 and the DC network 180, and a switch S5 may be disposed between the AC/DC converter 140 and the AC power distribution cabinet 170, so as to control the conduction of each circuit, where each switch may be used to control the conduction of the element with the live wire 11, and may also be used to control the conduction of the element with the live wire 11 and the neutral wire 10. The voltage of the live line 11 may be 750V and the voltage of the neutral line 10 0V.
The embodiment of the invention provides an electric energy quality evaluation device, which is used for direct current power distribution equipment, as shown in fig. 2, the electric energy quality detection device comprises a signal acquisition module 101, an analysis module 102 and a processing module 103, wherein the signal acquisition module 101 is used for acquiring an alternating current signal of an alternating current side of an AC/DC converter 140, and acquiring at least one of a first direct current signal of a direct current side of the AC/DC converter 140, a second direct current signal of a high voltage side of a first DC/DC converter 150 and a third direct current signal of a high voltage side of a second DC/DC converter 160; the analysis module 102 is connected with the signal acquisition module 101 and is used for analyzing the alternating current signal to obtain an alternating current fundamental component and an alternating current harmonic component and analyzing at least one of the first direct current signal, the second direct current signal and the third direct current signal to obtain a direct current fundamental component and a direct current harmonic component; the processing module 103 is connected with the analysis module 102, and is used for obtaining a distortion suppression ratio according to the alternating current fundamental component, the alternating current harmonic component, the direct current fundamental component and the direct current harmonic component, and obtaining a power quality evaluation result of the direct current power distribution equipment according to the distortion suppression ratio.
It can be understood that, referring to fig. 1, the signal acquisition module 101 may acquire the signal at the position point 01 to obtain an ac signal, acquire the signal at the position point 02 to obtain a first dc signal, acquire the signal at the position point 03 to obtain a second dc signal, and acquire the signal at the position point 04 to obtain a third dc signal.
The analysis module 102 may analyze the ac signal to obtain an ac fundamental component and an ac harmonic component, may analyze at least one of the first dc signal, the second dc signal, and the third dc signal to obtain a dc fundamental component and a dc harmonic component, and may analyze only the first dc signal, or the second dc signal, or the third dc signal to obtain a dc fundamental component and a dc harmonic component, or may simultaneously analyze two of the first dc signal, the second dc signal, and the third dc signal to obtain a dc fundamental component and a dc harmonic component of the two signals, respectively, and select the dc fundamental component and the dc harmonic component of one of the two signals as the dc fundamental component and the dc harmonic component that are finally transmitted to the processing module 103, or may simultaneously analyze the first dc signal, the second dc signal, and the third dc fundamental component, respectively, so as to obtain a dc fundamental component and a dc harmonic component of three signals, and select the dc fundamental component and a dc harmonic component of one of the signals as the dc fundamental component and the dc harmonic component that are finally transmitted to the processing module 103. The ac fundamental component, the ac harmonic component, the dc fundamental component, and the dc harmonic component may be voltage components, or may be current components.
The processing module 103 may obtain the distortion suppression ratio by the formula (1) -the formula (3)
Wherein ΔTDD is the distortion ratio, TDD DC For DC harmonic total demand harmonic distortion, TDD AC Is the total required harmonic distortion of the AC harmonic, n is the order of the DC harmonic component, and n is [2, H]Integer of H is more than or equal to 2, G 1 Is the effective value of the direct current fundamental component, G n Is the effective value of the nth harmonic component of the direct current harmonic component, i is the order of the alternating current harmonic component, and i is [2, N]Integer between N is more than or equal to 2, S 1 Is the effective value of the alternating-current fundamental component, S i Is the effective value of the ith harmonic component of the ac harmonic component. In one embodiment, H may be greater than or equal to 50.
The power quality evaluation result may be used to represent a harmonic suppression condition of the dc power distribution device, and may include at least one of a power quality good, and a power quality poor, where the processing module 103 may store a correspondence between each evaluation result and each value range corresponding to the distortion suppression ratio, so the processing module 103 may determine the power quality evaluation result according to the obtained distortion suppression ratio.
The power quality evaluation device of the embodiment of the invention acquires an alternating current signal of an alternating current side of an AC/DC converter 140 through a signal acquisition module 101, acquires at least one of a first direct current signal of a direct current side of the AC/DC converter 140, a second direct current signal of a high voltage side of a first DC/DC converter 150 and a third direct current signal of a high voltage side of a second DC/DC converter 160, and then analyzes the alternating current signal by an analysis module 102 to obtain an alternating current fundamental component and an alternating current harmonic component, and analyzes at least one of the first direct current signal, the second direct current signal and the third direct current signal to obtain a direct current fundamental component and a direct current harmonic component; and finally, the processing module 103 acquires a distortion ratio inhibition ratio according to the alternating-current fundamental wave component, the alternating-current harmonic wave component, the direct-current fundamental wave component and the direct-current harmonic wave component, and acquires an electric energy quality evaluation result of the direct-current power distribution equipment according to the distortion ratio inhibition ratio.
In one embodiment, the ac fundamental component includes an ac voltage fundamental component, the ac harmonic component includes an ac voltage harmonic component, the dc fundamental component includes a dc voltage fundamental component, and the dc harmonic component includes a dc voltage harmonic component, and the processing module 103 is configured to obtain the distortion suppression ratio based on the ac voltage fundamental component, the ac voltage harmonic component, the dc voltage fundamental component, and the dc voltage harmonic component.
It can be understood that the distortion ratio can be the distortion ratio of the power transmission voltage of the direct-current power distribution equipment, so that the power quality level of the direct-current power distribution equipment is obtained, and the influence on the power quality of an external power grid can be further evaluated.
In one embodiment, the ac fundamental component includes an ac current fundamental component, the ac harmonic component includes an ac current harmonic component, the dc fundamental component includes a dc current fundamental component, the dc harmonic component includes a dc current harmonic component, and the processing module 103 is configured to obtain the distortion suppression ratio based on the ac current fundamental component, the ac current harmonic component, the dc current fundamental component, and the dc current harmonic component.
It can be understood that the distortion ratio can be the distortion ratio of the power transmission current of the direct-current power distribution equipment, so that the power quality level of the direct-current power distribution equipment is known, and the influence on the power quality of an external power grid can be further evaluated.
In one embodiment, the signal acquisition module 101 acquires at least a first direct current signal; the analysis module 102 is further configured to determine whether the first dc signal is lost, and if the first dc signal is not lost, analyze the first dc signal to obtain a dc fundamental component and a dc harmonic component.
It is understood that the signal acquisition module 101 may acquire only the first direct current signal of the direct current side of the AC/DC converter 140, and may also acquire the first direct current signal, and at least one of the second direct current signal and the third direct current signal. Since the AC side and the DC side of the AC/DC converter 140 are main sources of harmonics, if the first DC signal is not lost, the DC fundamental component and the DC harmonic component can be preferentially obtained according to the first DC signal, so as to calculate the distortion suppression ratio, thereby making the power quality evaluation of the DC power distribution equipment more accurate.
In one embodiment, if there is a loss of the first dc signal, the analysis module 102 analyzes the second dc signal or the third dc signal to obtain a dc fundamental component and a dc harmonic component.
It can be appreciated that if the analysis module 102 determines that the first DC signal is lost, since the first DC/DC converter 150 and the second DC/DC converter 160 may generate harmonics, the power quality evaluation result may be obtained based on the distortion suppression ratio obtained by the second DC signal or the third DC signal, so as to increase the diversity of power quality evaluation modes and improve the power transmission safety.
In one embodiment, the analysis module 102 may include a power quality analyzer or a power analyzer.
In one embodiment, the power analyzer includes a signal detection module, and the signal acquisition module 101 and the signal detection module are the same module.
It is understood that the signal detection module in the power analyzer may be directly used as the signal acquisition module 101 for acquiring the ac signal, the first dc signal, the second dc signal, and the third dc signal. The signal detection module can comprise a voltage sensor and a current sensor, wherein the voltage sensor is used for detecting the voltage component of each signal, and the current sensor is used for detecting the current component of each signal, so that the cost can be reduced, and the circuit is simplified.
In one embodiment, the signal acquisition module 101 may further acquire a fourth DC signal on the low voltage side of the first DC/DC converter 150, the analysis module 102 may further analyze the fourth DC signal to obtain a fundamental component and a harmonic component of the fourth DC signal, the processing module 103 may further obtain a total required harmonic distortion rate of the fourth DC signal according to the fundamental component and the harmonic component of the fourth DC signal, and when the analysis module 102 is based on the DC fundamental component and the DC harmonic component obtained by the analysis of the second DC signal, the processing module 103 may obtain the total required harmonic distortion rate of the second DC signal according to the DC fundamental component and the DC harmonic component, and evaluate the power quality emission characteristic of the first DC/DC converter 150 according to the magnitude relation between the total required harmonic distortion rate of the second DC signal and the total required harmonic distortion rate of the fourth DC signal. In one embodiment, when the analysis module 102 analyzes that the obtained DC fundamental component and the DC harmonic component are not based on the second DC signal, the signal acquisition module 101 may further acquire the second DC signal, the analysis module 102 may further analyze the second DC signal to obtain the fundamental component and the harmonic component of the second DC signal, and the processing module 103 may further obtain the total required harmonic distortion rate of the second DC signal according to the fundamental component and the harmonic component of the second DC signal, and further evaluate the power quality emission characteristic of the first DC/DC converter 150 according to the magnitude relation between the total required harmonic distortion rate of the second DC signal and the total required harmonic distortion rate of the fourth DC signal.
The fourth dc signal may be an electrical signal at the location point 05, as shown in fig. 1.
In one embodiment, the signal acquisition module 101 may further acquire a fifth DC signal on the low voltage side of the second DC/DC converter 160, the analysis module 102 may further analyze the fifth DC signal to obtain a fundamental component and a harmonic component of the fifth DC signal, the processing module 103 may further obtain a total required harmonic distortion rate of the fifth DC signal according to the fundamental component and the harmonic component of the fifth DC signal, and when the analysis module 102 is based on the DC fundamental component and the DC harmonic component obtained by the analysis of the third DC signal, the processing module 103 may obtain the total required harmonic distortion rate of the third DC signal according to the DC fundamental component and the DC harmonic component, and evaluate the power quality emission characteristic of the second DC/DC converter 160 according to the magnitude relation between the total required harmonic distortion rate of the third DC signal and the total required harmonic distortion rate of the fifth DC signal. In one embodiment, when the analysis module 102 analyzes that the obtained DC fundamental component and the DC harmonic component are not based on the third DC signal, the signal acquisition module 101 may further acquire the third DC signal, the analysis module 102 may further analyze the third DC signal to obtain the fundamental component and the harmonic component of the third DC signal, and the processing module 103 may further obtain the total required harmonic distortion rate of the third DC signal according to the fundamental component and the harmonic component of the third DC signal, and further evaluate the power quality emission characteristic of the second DC/DC converter 160 according to the magnitude relation between the total required harmonic distortion rate of the third DC signal and the total required harmonic distortion rate of the fifth DC signal.
The fifth dc signal may be an electrical signal at the location point 06, as shown in fig. 1.
The embodiment of the invention also provides a power distribution system which comprises direct current power distribution equipment and the power quality evaluation device of any embodiment. The dc power distribution device is specifically described in the above embodiments, and details thereof are not described herein.
The embodiment of the invention also provides a power quality evaluation method for the direct current power distribution equipment, as shown in fig. 3, and the method comprises the steps of S110 to S140.
In step S110, an AC signal on the AC side of the AC/DC converter 140 is obtained.
Step S120 obtains at least one of a first direct current signal on the direct current side of the AC/DC converter 140, a second direct current signal on the high voltage side of the first DC/DC converter 150, and a third direct current signal on the high voltage side of the second DC/DC converter 160.
Step S130, analyzing the ac signal to obtain an ac fundamental component and an ac harmonic component, and analyzing at least one of the first dc signal, the second dc signal, and the third dc signal to obtain a dc fundamental component and a dc harmonic component.
And step S140, obtaining a distortion factor suppression ratio according to the alternating-current fundamental wave component, the alternating-current harmonic wave component, the direct-current fundamental wave component and the direct-current harmonic wave component, and obtaining a power quality evaluation result of the direct-current power distribution equipment according to the distortion factor suppression ratio.
The principle and the beneficial effects of the power quality evaluation method in the embodiment of the present invention are similar to those of the power quality evaluation device in the above embodiment, and are not described here again.
In one embodiment, the ac fundamental component comprises an ac voltage fundamental component, the ac harmonic component comprises an ac voltage harmonic component, the dc fundamental component comprises a dc voltage fundamental component, the dc harmonic component comprises a dc voltage harmonic component, and the step of obtaining the distortion suppression ratio from the ac fundamental component, the ac harmonic component, the dc fundamental component, and the dc harmonic component comprises: and obtaining the distortion suppression ratio according to the alternating voltage fundamental wave component, the alternating voltage harmonic wave component, the direct voltage fundamental wave component and the direct voltage harmonic wave component.
In one embodiment, the ac fundamental component comprises an ac current fundamental component, the ac harmonic component comprises an ac current harmonic component, the dc fundamental component comprises a dc current fundamental component, the dc harmonic component comprises a dc current harmonic component, and the step of obtaining the distortion suppression ratio from the ac fundamental component, the ac harmonic component, the dc fundamental component, and the dc harmonic component comprises: and obtaining the distortion suppression ratio according to the alternating current fundamental wave component, the alternating current harmonic wave component, the direct current fundamental wave component and the direct current harmonic wave component.
In one embodiment, the step of collecting at least one of a first direct current signal on the direct current side of the AC/DC converter 140, a second direct current signal on the high voltage side of the first DC/DC converter 150 and a third direct current signal on the high voltage side of the second DC/DC converter 160 comprises: collecting at least a first direct current signal; the step of analyzing at least one of the first direct current signal, the second direct current signal and the third direct current signal to obtain a direct current fundamental component and a direct current harmonic component comprises the steps of: and determining whether the first direct current signal is lost, and if the first direct current signal is not lost, analyzing the first direct current signal to obtain a direct current fundamental component and a direct current harmonic component.
In one embodiment, the step of collecting at least one of the first direct current signal on the direct current side of the AC/DC converter 140, the second direct current signal on the high voltage side of the first DC/DC converter 150 and the third direct current signal on the high voltage side of the second DC/DC converter 160 further comprises: and if the first direct current signal is lost, analyzing the second direct current signal or the third direct current signal to obtain a direct current fundamental component and a direct current harmonic component.
The embodiment of the invention also provides a computer readable storage medium, on which a computer program is stored, characterized in that the computer program, when executed by a processor, implements the steps of the above power quality evaluation method.
Those skilled in the art will appreciate that implementing all or part of the above described methods may be accomplished by way of a computer program stored on a non-transitory computer readable storage medium, which when executed, may comprise the steps of the embodiments of the methods described above. Any reference to memory, storage, database, or other medium used in embodiments provided herein may include at least one of non-volatile and volatile memory. The nonvolatile Memory may include Read-Only Memory (ROM), magnetic tape, floppy disk, flash Memory, optical Memory, or the like. Volatile memory can include random access memory (Random Access Memory, RAM) or external cache memory. By way of illustration, and not limitation, RAM can be in the form of a variety of forms, such as static random access memory (Static Random Access Memory, SRAM) or dynamic random access memory (Dynamic Random Access Memory, DRAM), and the like.
In the description of the present specification, reference to the terms "some embodiments," "other embodiments," "desired embodiments," and the like, means 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 invention. In this specification, schematic descriptions of the above terms do not necessarily refer to the same embodiment or example.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (10)
1. The utility model provides an electric energy quality evaluation device, its characterized in that is used for direct current to join in marriage the consumer, direct current to join in marriage the consumer and include distributed energy power generation facility, energy storage device, charging device, AC/DC converter, first DC/DC converter and second DC/DC converter, AC/DC converter is connected with exchanging switch board and direct current network respectively, first DC/DC converter respectively with distributed energy power generation facility and direct current network connection, second DC/DC converter respectively with energy storage device with direct current network connection, charging device is connected with direct current network connection, electric energy quality evaluation device includes:
the signal acquisition module is used for
Collecting alternating current signals of an alternating current side of an AC/DC converter;
collecting at least one of a first direct current signal of a direct current side of the AC/DC converter, a second direct current signal of a high voltage side of the first DC/DC converter and a third direct current signal of a high voltage side of the second DC/DC converter;
the analysis module is connected with the signal acquisition module and is used for analyzing the alternating current signal to obtain an alternating current fundamental component and an alternating current harmonic component and analyzing at least one of the first direct current signal, the second direct current signal and the third direct current signal to obtain a direct current fundamental component and a direct current harmonic component;
the processing module is connected with the analysis module and used for obtaining a distortion rate suppression ratio according to the alternating current fundamental wave component, the alternating current harmonic wave component, the direct current fundamental wave component and the direct current harmonic wave component and obtaining a power quality evaluation result of the direct current power distribution equipment according to the distortion rate suppression ratio.
2. The power quality evaluation device according to claim 1, wherein the ac fundamental component includes an ac voltage fundamental component, the ac harmonic component includes an ac voltage harmonic component, the dc fundamental component includes a dc voltage fundamental component, the dc harmonic component includes a dc voltage harmonic component, and the processing module is configured to obtain the distortion suppression ratio based on the ac voltage fundamental component, the ac voltage harmonic component, the dc voltage fundamental component, and the dc voltage harmonic component.
3. The power quality evaluation device according to claim 1, wherein the ac fundamental component includes an ac current fundamental component, the ac harmonic component includes an ac current harmonic component, the dc fundamental component includes a dc current fundamental component, the dc harmonic component includes a dc current harmonic component, and the processing module is configured to obtain the distortion suppression ratio based on the ac current fundamental component, the ac current harmonic component, the dc current fundamental component, and the dc current harmonic component.
4. The power quality evaluation device according to claim 1, wherein,
the signal acquisition module acquires at least the first direct current signal;
the analysis module is also used for
Determining whether the first direct current signal is lost;
and if the first direct current signal is not lost, analyzing the first direct current signal to obtain the direct current fundamental component and the direct current harmonic component.
5. The power quality evaluation device according to claim 4, wherein,
and if the first direct current signal is lost, the analysis module analyzes the second direct current signal or the third direct current signal to obtain the direct current fundamental wave component and the direct current harmonic component.
6. The power quality assessment device of claim 1, wherein the analysis module may comprise a power quality analyzer or a power analyzer.
7. The power quality assessment device according to claim 6, wherein the power analyzer comprises a signal detection module, the signal acquisition module and the signal detection module being the same module.
8. A power distribution system, comprising:
direct current power distribution equipment; and
the power quality evaluation device according to any one of claims 1 to 7.
9. The method for evaluating the electric energy quality is characterized by being applied to direct-current power distribution equipment, and comprises the following steps:
acquiring an alternating current signal of an alternating current side of an AC/DC converter;
acquiring at least one of a first direct current signal of a direct current side of the AC/DC converter, a second direct current signal of a high voltage side of the first DC/DC converter and a third direct current signal of a high voltage side of the second DC/DC converter;
analyzing the alternating current signal to obtain an alternating current fundamental component and an alternating current harmonic component, and analyzing at least one of the first direct current signal, the second direct current signal and the third direct current signal to obtain a direct current fundamental component and a direct current harmonic component;
and acquiring a distortion ratio inhibition ratio according to the alternating-current fundamental wave component, the alternating-current harmonic wave component, the direct-current fundamental wave component and the direct-current harmonic wave component, and acquiring an electric energy quality evaluation result of the direct-current power distribution equipment according to the distortion ratio inhibition ratio.
10. A computer readable storage medium, on which a computer program is stored, characterized in that the computer program, when being executed by a processor, implements the steps of the method as claimed in claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111127804.4A CN113884791B (en) | 2021-09-26 | 2021-09-26 | Power quality evaluation device, power quality evaluation method, power distribution system and storage medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111127804.4A CN113884791B (en) | 2021-09-26 | 2021-09-26 | Power quality evaluation device, power quality evaluation method, power distribution system and storage medium |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113884791A CN113884791A (en) | 2022-01-04 |
| CN113884791B true CN113884791B (en) | 2023-06-06 |
Family
ID=79006777
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111127804.4A Active CN113884791B (en) | 2021-09-26 | 2021-09-26 | Power quality evaluation device, power quality evaluation method, power distribution system and storage medium |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113884791B (en) |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007282427A (en) * | 2006-04-10 | 2007-10-25 | Toshiba Corp | Power quality evaluation system, its method and program |
| JP2012105501A (en) * | 2010-11-12 | 2012-05-31 | Mitsubishi Heavy Ind Ltd | Electric power system and monitor control method thereof |
| CN102510057A (en) * | 2011-10-11 | 2012-06-20 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Direct current harmonic distortion computing method based on EMTDC (electromagnetic transient direct current) simulating tool |
| CN104167939A (en) * | 2014-08-29 | 2014-11-26 | 北京天诚同创电气有限公司 | Method and device for modulating current transformer |
| WO2016138750A1 (en) * | 2015-03-04 | 2016-09-09 | 江苏省电力公司常州供电公司 | Power quality disturbance source locating system and locating method |
| CN107039995A (en) * | 2016-11-28 | 2017-08-11 | 国网湖北省电力公司宜昌供电公司 | A kind of distributed photovoltaic power access planing method for considering power quality problem |
| CN107947219A (en) * | 2017-12-06 | 2018-04-20 | 中国南方电网有限责任公司超高压输电公司广州局 | Harmonic analysis method caused by a kind of extra-high voltage DC transmission system DC magnetic bias |
| CN108535560A (en) * | 2018-03-19 | 2018-09-14 | 中国电力科学研究院有限公司 | The characterizing method and system of degree of coupling between a kind of multi-infeed DC system dc |
| WO2019208325A1 (en) * | 2018-04-26 | 2019-10-31 | 三菱重工サーマルシステムズ株式会社 | Control device, air conditioner, control method, and program |
| CN110460052A (en) * | 2019-03-05 | 2019-11-15 | 国网天津市电力公司电力科学研究院 | A kind of photovoltaic inversion control method that can improve distribution network electric energy quality |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130336010A1 (en) * | 2012-06-18 | 2013-12-19 | Honeywell International Inc. | Systems and methods for operating an ac/dc converter while maintaining harmonic distortion limits |
-
2021
- 2021-09-26 CN CN202111127804.4A patent/CN113884791B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007282427A (en) * | 2006-04-10 | 2007-10-25 | Toshiba Corp | Power quality evaluation system, its method and program |
| JP2012105501A (en) * | 2010-11-12 | 2012-05-31 | Mitsubishi Heavy Ind Ltd | Electric power system and monitor control method thereof |
| CN102510057A (en) * | 2011-10-11 | 2012-06-20 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Direct current harmonic distortion computing method based on EMTDC (electromagnetic transient direct current) simulating tool |
| CN104167939A (en) * | 2014-08-29 | 2014-11-26 | 北京天诚同创电气有限公司 | Method and device for modulating current transformer |
| WO2016138750A1 (en) * | 2015-03-04 | 2016-09-09 | 江苏省电力公司常州供电公司 | Power quality disturbance source locating system and locating method |
| CN107039995A (en) * | 2016-11-28 | 2017-08-11 | 国网湖北省电力公司宜昌供电公司 | A kind of distributed photovoltaic power access planing method for considering power quality problem |
| CN107947219A (en) * | 2017-12-06 | 2018-04-20 | 中国南方电网有限责任公司超高压输电公司广州局 | Harmonic analysis method caused by a kind of extra-high voltage DC transmission system DC magnetic bias |
| CN108535560A (en) * | 2018-03-19 | 2018-09-14 | 中国电力科学研究院有限公司 | The characterizing method and system of degree of coupling between a kind of multi-infeed DC system dc |
| WO2019208325A1 (en) * | 2018-04-26 | 2019-10-31 | 三菱重工サーマルシステムズ株式会社 | Control device, air conditioner, control method, and program |
| CN110460052A (en) * | 2019-03-05 | 2019-11-15 | 国网天津市电力公司电力科学研究院 | A kind of photovoltaic inversion control method that can improve distribution network electric energy quality |
Non-Patent Citations (2)
| Title |
|---|
| 交/直流线路并行运行对铁心饱和不稳定的影响;任跃等;电测与仪表;第53卷(第18期);第14-20页 * |
| 基于配电网电能质量健康评估策略的分布式光伏接入方法;左伟杰等;电网技术;第39卷(第12期);第3442-3448页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113884791A (en) | 2022-01-04 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Hui et al. | Assessing utility harmonic impedance based on the covariance characteristic of random vectors | |
| Bastidas-Rodríguez et al. | Model-based degradation analysis of photovoltaic modules through series resistance estimation | |
| US20140244189A1 (en) | System For Achieving Real-Time Monitoring and State Estimation in Power Distribution Networks | |
| CN109001573B (en) | Method for determining short-circuit capacity of collector bus of wind power plant | |
| CN110716097B (en) | Power supply network topology identification method and device | |
| CN112763853B (en) | System for detecting and positioning short-circuit fault of alternating-current micro-grid in grid-connected mode and working method thereof | |
| Lavenius et al. | Performance assessment of PMU-based estimation methods of Thevenin equivalents for real-time voltage stability monitoring | |
| CN115201563B (en) | Multi-harmonic source positioning method and system based on joint entropy | |
| CN112582978B (en) | Leakage protection method and device and charging pile | |
| CN113884791B (en) | Power quality evaluation device, power quality evaluation method, power distribution system and storage medium | |
| CN107561410B (en) | Online testing system for distributed power supply grid-connected inverter and capacitor | |
| CN112993988A (en) | Power grid line loss analysis method | |
| CN110794210B (en) | Method and device for judging voltage harmonic isolation effect, power supply system, computer equipment and storage medium | |
| CN105699740A (en) | Method for measuring all-scale range current | |
| Rogalla et al. | Determination of the frequency dependent thévenin equivalent of inverters using differential impedance spectroscopy | |
| Datta et al. | Harmonic distortion, inter-harmonic group magnitude and discrete wavelet transformation based statistical parameter estimation for line to ground fault analysis in microgrid system | |
| Inamdar et al. | A review of methods employed to identify flicker producing sources | |
| CN113315100A (en) | Micro-grid protection method and system based on convolutional neural network | |
| CN112285421A (en) | System side harmonic impedance estimation method based on minimum norm criterion | |
| Priyadarshini et al. | Significance of Harmonic Filters by Computation of Short-Time Fourier Transform-Based Time–Frequency Representation of Supply Voltage. Energies 2023, 16, 2194 | |
| CN110632477A (en) | Transformer running state vibration and sound detection method and system by using Hilbert space factor | |
| Leborgne et al. | Differences in voltage dip exposure depending upon phase-to-phase and phase-to-neutral monitoring connections | |
| CN110286283A (en) | Micro-grid island detection method and system | |
| Pourkeivani et al. | A Novel Index to Predict the Voltage Instability Point in Power Systems Using PMU-based State Estimation | |
| Jahanger et al. | Influence of DGs on the single-ended impedance based fault location technique |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |