Electric energy quality loss test method, system, equipment and medium

Abstract

The invention discloses an electric energy quality loss test method, system and device and a medium. The method comprises the following steps: acquiring three-phase voltage data and three-phase current data; calculating the equivalent total loss power in the power distribution network line through the apparent power value, the voltage and the resistance based on the collected voltage and current data; and based on the equivalent total loss power, in combination with the power factors of different line losses, carrying out line loss subentry decoupling to obtain additional line losses caused by different electric energy quality problems. According to the invention, extra loss of the line caused by electric energy quality can be accurately measured, and line resistance does not need to be measured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power quality evaluation, and in particular to a power quality loss testing method, system, device and medium. BACKGROUND

[0002] With the substantial increase of nonlinear power load, the line loss problem caused by power quality in power system is becoming more and more serious. According to the data statistics of power quality problems on distribution network loss, as high as 60% of the distribution network loss is caused by low-voltage distribution network. Among the many causes of power quality problems, reactive power, harmonics and three-phase imbalance are the key factors causing the line loss of power grid. At present, the line loss calculation of distribution network station area of power grid company is mainly based on the theoretical line loss model under the influence of single power quality problem, and rarely considers the line loss calculation under the influence of composite power quality. In addition, when the line has slight power quality loss, it may not be reasonable to invest a large amount of cost to govern the line.

[0003] The existing instruments with power quality analysis function all need to give accurate line resistance value to analyze the loss caused by power quality. Taking FLUKE-435 power quality and energy analyzer which can decouple power quality line loss as an example, when using its energy analysis function, the line resistance value needs to be input first, and then the line loss value caused by reactive power, harmonics and imbalance after decoupling can be calculated. However, due to the influence of skin effect and proximity effect under the condition of harmonics, it is difficult to accurately determine the harmonic resistance value. This operation may introduce large error, and lacks practical application guidance. At the same time, under the actual working condition of low-voltage distribution network, it is usually challenging to accurately measure the line length, so the line resistance calculated based on the line length may have a certain degree of error. Therefore, it is urgent to develop a power quality analyzer which can analyze the loss caused by power quality without line resistance value. SUMMARY

[0004] In view of the above existing problems, the present application is proposed.

[0005] Therefore, the present application provides a power quality loss testing method, system, device and medium to solve the problem that accurate line resistance value needs to be given to analyze the loss caused by power quality.

[0006] To solve the above technical problems, the present application provides the following technical solutions:

[0007] In a first aspect, the present application provides a power quality loss testing method, comprising:

[0008] obtaining three-phase voltage data and three-phase current data;

[0009] Based on the collected voltage and current data, the equivalent total loss power in the power distribution network line is calculated through the apparent power value, voltage and resistance;

[0010] Based on the equivalent total loss power, the line loss is decoupled in combination with the power factor of different line losses to obtain additional line losses caused by different power quality problems.

[0011] As a preferred scheme of the power quality loss test method, wherein: the calculation of the equivalent total loss power in the power distribution network line comprises:

[0012] Obtain the original voltage and current data of the three-phase nonlinear unbalanced system;

[0013] Through the equivalent process, the voltage and current of the nonlinear unbalanced system are converted into equivalent current values and voltage values of the linear balanced system;

[0014] Based on the equivalent current values and voltage values, the apparent power value is calculated through the power decomposition equation;

[0015] Based on the apparent power value in combination with the line resistance, the equivalent total loss power in the power distribution network line is calculated.

[0016] The beneficial effects of the preferred technical scheme are that the complex three-phase nonlinear unbalanced system is equivalent to a linear balanced system, and the power decomposition and loss calculation are carried out based on the equivalent voltage and current, so that the total line loss in the power distribution network and its composition are accurately quantified, and theoretical basis and technical support are provided for power quality analysis and energy saving optimization.

[0017] As a preferred scheme of the power quality loss test method, wherein: the equivalent process comprises:

[0018] The fundamental wave and harmonic components of each phase voltage and current are extracted respectively;

[0019] The equivalent voltage and equivalent current are synthesized according to a specific weighting method;

[0020] The fundamental wave part and the total harmonic wave part in the equivalent voltage and the equivalent current are distinguished.

[0021] As a preferred scheme of the power quality loss test method, wherein: the obtaining of various types of power quality additional line losses comprises:

[0022] The equivalent total loss power is decomposed into various types of additional line losses;

[0023] Four power factors of different line losses are defined;

[0024] Through power factor decoupling, the additional line losses caused by different power quality problems are calculated respectively.

[0025] The beneficial effects of the preferred technical solution are that by defining four power factors corresponding to different line losses and decoupling calculation, the additional line losses caused by different power quality problems such as reactive power, imbalance, and harmonics can be accurately identified and quantified, thereby providing a scientific basis for targeted governance and energy efficiency optimization.

[0026] As a preferred scheme of the power quality loss testing method, wherein: the equivalent total loss power ΔP eLoss is expressed as:

[0027]

[0028] wherein, S e is the equivalent apparent power, I e is the equivalent current for equivalent non-linear unbalanced system to linear balanced system, U e is the equivalent voltage for equivalent non-linear unbalanced system to linear balanced system, represents the fundamental positive sequence active power, represents the fundamental positive sequence reactive power, S U1 is the fundamental unbalanced apparent power, D eI is the equivalent current distortion power, D eU is the equivalent voltage distortion power, S eH is the equivalent harmonic apparent power, ΔP eP is the fundamental positive sequence active line loss, ΔP eQ is the fundamental positive sequence reactive additional line loss, ΔP eU is the unbalanced additional line loss, ΔP eH is the harmonic additional line loss

[0029] As a preferred scheme of the power quality loss testing method, wherein: the four power factors of different line losses are expressed as:

[0030]

[0031] wherein, PF eP is the fundamental positive sequence active line loss power factor, PF eQ is the reactive line loss power factor, PF eU is the unbalanced line loss power factor, PF eH is the harmonic line loss power factor, S 1+ is the fundamental positive sequence apparent power, S eLoss is the total equivalent line loss apparent power, is the fundamental positive sequence apparent power, S ePU is the equivalent apparent power containing unbalance, S ePH is the equivalent apparent power containing harmonics.

[0032] As a preferred scheme of the power quality loss test method, the additional line loss caused by different power quality problems is represented as:

[0033]

[0034] ΔP eP is the fundamental positive sequence active line loss, ΔP eQ is the reactive additional line loss, ΔP eU is the unbalanced additional line loss, and ΔP eH is the harmonic additional line loss.

[0035] In a second aspect, the present application provides a power quality loss test system, comprising:

[0036] An acquisition module is configured to acquire three-phase voltage data and three-phase current data.

[0037] A calculation module is configured to calculate the equivalent total loss power in the distribution network line based on the acquired voltage and current data, through the apparent power value, voltage and resistance.

[0038] A decoupling module is configured to decouple the line loss in parts based on the equivalent total loss power and the power factor of different line losses, to obtain the additional line loss caused by different power quality problems.

[0039] In a third aspect, the present application provides an electronic device, comprising:

[0040] A memory is configured to store a program.

[0041] A processor is configured to execute the computer executable instructions, which, when executed by the processor, implement the steps of the power quality loss test method.

[0042] In a fourth aspect, the present application provides a computer readable storage medium, comprising: the program, when executed by the processor, implements the steps of the power quality loss test method.

[0043] The beneficial effects of the present application: the present application realizes the technical effect of simplifying the complex power system by obtaining the original voltage and current data of the three-phase nonlinear unbalanced system and converting them into equivalent parameters of the linear balanced system by equivalent conversion method, making the subsequent analysis more simple and accurate; the application of power decomposition equation calculates the apparent power value, and the equivalent total loss power in the distribution network line is calculated by combining the line resistance, which achieves the technical effect of quantifying the overall line loss and identifying the main loss source, and lays the foundation for further optimization measures; four power factors of different line losses are defined, and the additional line losses caused by reactive power, unbalance and harmonics are calculated respectively by power factor decoupling, which realizes the precise positioning of the specific influence of various power quality problems on line loss, and provides scientific basis and technical support for targeted energy-saving and loss-reducing measures. These steps work together to improve the operation efficiency and power quality of the power system. BRIEF DESCRIPTION OF DRAWINGS

[0044] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor. Among them:

[0045] Figure 1 The basic flowchart of a power quality loss test method provided by an embodiment of the present application is shown in the figure;

[0046] Figure 2 The hardware architecture diagram of a power quality loss test method provided by an embodiment of the present application is shown in the figure;

[0047] Figure 3 The software flowchart of a power quality loss test method provided by an embodiment of the present application is shown in the figure;

[0048] Figure 4 The distribution network diagram of a power quality loss test method provided by an embodiment of the present application is shown in the figure;

[0049] Figure 5 The equivalent diagram of a power quality loss test method provided by an embodiment of the present application is shown in the figure. DETAILED DESCRIPTION

[0050] In order to make the above objectives, characteristics and advantages of the present application more obvious and easy to understand, the specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor should fall within the scope of protection of the present application.

[0051] Embodiment 1, reference Figure 1 For an embodiment of the present application, a power quality loss test method is provided, comprising:

[0052] S100: acquiring three-phase voltage data and three-phase current data;

[0053] S200: based on the collected voltage and current data, the equivalent total loss power in the distribution network line is calculated through the apparent power value, voltage and resistance;

[0054] S300: based on the equivalent total loss power, combined with the power factor of different line losses, the line loss is decoupled to obtain the additional line loss caused by different power quality problems.

[0055] It should be noted that during the operation of the power system, there are many challenges in calculating the line loss of the distribution network station area, mainly including three-phase load imbalance, serious harmonic interference, frequent voltage fluctuation and insufficient data acquisition accuracy, etc. In addition, the low-voltage distribution network structure is complex, and the user side electricity behavior is strong randomness, which leads to variable operation conditions, and it is difficult to establish a unified loss model. At the same time, the traditional line loss calculation method often ignores the influence of power quality problems, and it is difficult to realize the fine decomposition of loss components, which further increases the difficulty of accurately evaluating the line loss. In order to maximize the input-output ratio of the low-voltage distribution network line loss governance, the reactive, unbalanced and harmonic line loss evaluation indexes can be used as the standard to determine whether governance is needed. Therefore, the accurate calculation of the line loss components of the low-voltage distribution network and the line loss evaluation under the composite power quality operating conditions have extremely important significance for promoting the improvement of power energy saving and loss reduction work.

[0056] Therefore, in order to solve the problem of analyzing the loss caused by power quality by giving accurate line resistance value in view of the existing needs, through the steps of S100-S300, the line loss decomposition technology based on equivalent apparent power and power factor decoupling is proposed by combing the theoretical basis and implementation method of distribution network line loss calculation, which can accurately identify the additional loss caused by reactive power, three-phase imbalance and harmonic factors, and realize the fine evaluation of low-voltage distribution network line loss components. The method not only improves the accuracy and scientificity of line loss analysis, but also provides an effective power quality and energy consumption management tool for power system operators, which has important guiding significance for promoting the accurate implementation of energy saving and loss reduction measures and optimizing the operation efficiency of power grid.

[0057] Embodiment 2, refer to Figures 2-5 For an embodiment of the present application, a power quality loss test method is provided based on the previous embodiment, comprising:

[0058] In the embodiment of the present application, the equivalent total loss power in the distribution network line in step S200 is calculated, comprising:

[0059] Obtain the original voltage and current data of the three-phase nonlinear unbalanced system;

[0060] Through the equivalent process, the voltage and current of the nonlinear unbalanced system are converted into equivalent current values and voltage values of the linear balanced system;

[0061] Based on the equivalent current values and voltage values, the apparent power value is calculated through the power decomposition equation;

[0062] Based on the apparent power value and the line resistance, the equivalent total loss power in the distribution network line is calculated.

[0063] In the embodiment of the present application, the original voltage of the three-phase nonlinear unbalanced system is represented as:

[0064]

[0065] In the embodiment of the present application, the original current of the three-phase nonlinear unbalanced system is represented as:

[0066]

[0067] Wherein, U h+ is the effective value of the hth harmonic positive sequence voltage; U h- is the effective value of the hth harmonic negative sequence voltage; U h0 is the effective value of the hth harmonic zero sequence voltage; I h+ is the effective value of the hth harmonic positive sequence current; I h- is the effective value of the hth harmonic negative sequence current; I h0 is the effective value of the hth harmonic zero sequence current; θuh+ is the phase angle of the hth harmonic positive sequence voltage; θ uh- is the phase angle of the hth harmonic negative sequence voltage; θ uh0 is the phase angle of the hth harmonic zero sequence voltage; θ ih+ is the phase angle of the hth harmonic positive sequence current; θ ih- is the phase angle of the hth harmonic negative sequence current; θ ih0 is the phase angle of the hth harmonic zero sequence current.

[0068] In the embodiments of the present application, according to the IEEE 1459-2010 power theory, the nonlinear unbalanced system can be equivalent to a linear balanced power distribution network with constant line loss and load, as shown in FIG. 1. Figure 5 The current-voltage relationship before and after the equivalent is respectively shown as:

[0069]

[0070] wherein, I e is the equivalent current for equivalent of the nonlinear unbalanced system to the linear balanced system; I e1 is the fundamental component of the equivalent current; I eH is the harmonic component of the equivalent current; U e is the equivalent voltage for equivalent of the nonlinear unbalanced system to the linear balanced system; U e1 is the fundamental component of the equivalent voltage; U eH is the harmonic component of the equivalent voltage.

[0071] In the embodiments of the present application, the calculation of the apparent power value is shown as:

[0072]

[0073] wherein, S e is the equivalent apparent power, indicating the apparent power of the system after the equivalent; S e1 is the fundamental equivalent apparent power, indicating the power generated by the fundamental; S eN is the non-fundamental equivalent apparent power, indicating the power generated by the non-fundamental; S 1+ is the fundamental positive sequence apparent power, indicating the power generated by the fundamental positive sequence; S U1 is the fundamental unbalanced apparent power, indicating the power generated by the fundamental unbalanced component; indicates the fundamental positive sequence active power, indicates the fundamental positive sequence reactive power, indicates the fundamental positive sequence voltage effective value, indicates the fundamental positive sequence current effective value, indicates the fundamental positive sequence phase angle, D eI is the equivalent current distortion power, indicating the power generated by the current distortion; D eUS is the equivalent voltage distortion power, representing the power generated by voltage distortion. eH S is the equivalent harmonic apparent power, representing the power generated by harmonics.

[0074] In the embodiments of the present application, the equivalent process comprises:

[0075] The fundamental wave and harmonic components of the voltage and current of each phase are extracted respectively;

[0076] The equivalent voltage and the equivalent current are synthesized according to a specific weighting method;

[0077] The fundamental wave part and the total harmonic part in the equivalent voltage and the equivalent current are distinguished.

[0078] In an alternative embodiment, the equivalent synthesis method based on FFT and adaptive filtering used in step S200 comprises using fast Fourier transform (FFT) to perform frequency domain decomposition on the voltage and current signals of each phase, extracting the fundamental wave and harmonic components; then introducing weighting coefficients to weight and synthesize different frequency components to form the equivalent voltage and the equivalent current; finally separating the fundamental wave part and the total harmonic part in the equivalent signal through adaptive filtering technology.

[0079] In another alternative embodiment, the equivalent modeling method based on wavelet packet transform and energy weighting used in step S200 comprises using wavelet packet transform to perform multi-scale decomposition on the voltage and current signals, identifying and extracting the fundamental wave and harmonic components in each frequency band; then setting weighting factors according to the energy distribution of each frequency band to synthesize the equivalent voltage and the equivalent current; finally distinguishing the fundamental wave component and the total harmonic component in the equivalent signal by reconstructing the wavelet coefficients of a specific frequency band.

[0080] It should be noted that the equivalent modeling method based on frequency domain decomposition and weighted synthesis adopted by the present application, compared with the method based on FFT and adaptive filtering, simplifies the filter design complexity while maintaining good frequency resolution, and improves the calculation efficiency; compared with the wavelet packet transform and energy weighting method, it avoids the high-dimensional operation burden brought by multi-scale decomposition, and has stronger real-time performance and engineering realizability. Under the premise of effectively separating the fundamental wave and harmonic components, the method synthesizes the equivalent voltage and the equivalent current through a weighting mechanism with clear physical meaning, has advantages such as intuitive modeling process, low implementation cost, strong adaptability, and is more suitable for application in the line loss analysis and loss evaluation scene of power quality testers.

[0081] In the embodiments of the present application, the equivalent total loss power in the distribution network line is represented as:

[0082]

[0083] It can be seen that the equivalent apparent power S eEach component of the equivalent total loss power contributes to the system bus loss, but the equivalent voltage distortion power D can be ignored because the voltage distortion in the line is very small eU and the equivalent harmonic apparent power S eH . According to the power quality problems, the equivalent total loss power is decomposed into several components, including the fundamental positive sequence active line loss ΔP eP , the fundamental positive sequence reactive additional line loss ΔP eQ , the unbalanced additional line loss ΔP eU , and the harmonic additional line loss ΔP eH .

[0084] In the embodiments of the present application, the various types of power quality additional line losses obtained in step S300 include:

[0085] The equivalent total loss power is decomposed into various types of additional line losses;

[0086] Four power factors of different line losses are defined;

[0087] Through power factor decoupling, the additional line losses caused by different power quality problems are calculated respectively.

[0088] In an optional implementation, the real-time power quality analysis system based on a software algorithm platform used in step S300 includes that after the system collects three-phase voltage and current signals, the digital signal processing algorithm is used to extract each harmonic, positive and negative zero sequence components, and the equivalent apparent power and equivalent current are calculated according to the IEEE 1459 standard. On this basis, combined with the defined four power factors (PF e P, PF e Q, PF e U, and PF e H), the various types of additional line losses are automatically identified and decomposed through the built-in decoupling algorithm module.

[0089] In another optional implementation, the hardware acceleration type power quality monitoring device based on FPGA or DSP used in step S300 includes that a high-performance digital signal processor (DSP) or a field programmable gate array (FPGA) is used as a core control unit to realize real-time high-speed signal acquisition and processing. The hardware logic directly synchronously samples the input voltage and current signals, performs fast Fourier transform (FFT) and harmonic decomposition, and calculates the equivalent parameters and line loss models.

[0090] It should be noted that the method of decoupling line loss based on equivalent total loss power and combining different line loss power factors adopted by the present application has stronger physical model support and decoupling analysis capability compared with the real-time power quality analysis system based on a software algorithm platform and the hardware acceleration monitoring device based on FPGA or DSP, can accurately identify the independent contribution of various power quality problems to line loss from the nature of energy loss, and realizes efficient decomposition and quantitative evaluation of additional line loss without relying on complex software and hardware platforms, has the advantages of low implementation cost, high calculation efficiency and wide application range, and is particularly suitable for power quality management and energy saving evaluation scenarios with high precision and interpretability requirements.

[0091] In the embodiments of the present application, four power factors are defined for a three-phase nonlinear asymmetric system, including fundamental positive sequence active line loss power factor PF eP , reactive line loss power factor PF eQ , unbalanced line loss power factor PF eU , and harmonic line loss power factor PF eH These power factors can be represented by the following formulas:

[0092]

[0093] In the embodiments of the present application, the values of fundamental positive sequence active line loss power factor PF eP , reactive line loss power factor PF eQ , unbalanced line loss power factor PF eU , and harmonic line loss power factor PF eH are between 0 and 1, and decrease with the increase of additional line loss related to power quality. When there is no additional line loss related to power quality in the system, the values of the four line loss power factors are equal to 1.

[0094] In the embodiments of the present application, various types of power quality additional line loss are represented as:

[0095]

[0096] In the embodiments of the present application, as shown in Figure 3 , the power quality loss test method includes initializing after starting and waiting for server commands, then starting data acquisition under the control of ECS Server; the collected data are used to calculate line loss power factors, and the results are stored in an SD card; at the same time, the data are uploaded to the ECS Server, and the whole process is repeated until the server issues an end command.

[0097] In the embodiments of the present application, the power distribution network shown in Figure 4 is taken as an example to illustrate the power quality loss test method, and the steps are as follows:

[0098] 1. Two power quality testers are arranged at point 1 and point 2, and the cloud server is used to send instructions to make them start measuring at the same time.

[0099] 2. The power measured at point 1 is subtracted from the power measured at point 2, that is, ΔP eLoss .

[0100] 3. The four power factors measured by the power quality tester at point 1 and ΔP eLoss are brought into the decoupling calculation formula, and the power quality line loss between point 1 and point 2 can be obtained without measuring the resistance between point 1 and point 2.

[0101] In the embodiments of the present application, the architecture of the power quality tester used in the power quality loss testing method is shown in Figure 2 , which includes a core main control module, a 4G module, a GPS module, a signal conditioning and acquisition module, and a power management module, and the modules are connected through circuits.

[0102] In the embodiments of the present application, the core main control module adopts a heterogeneous multi-core architecture of A40i+PGL25G, wherein the processor A40i contains four ARM Cortex-A7 processors with a main frequency of 1.2GHz, contains 1GB RAM and 8GB ROM, adopts Linux operating system, and the field programmable gate array PGL25G contains 27072 logic units and 64Mbit ROM. SPI protocol communication is adopted between A40i and PGL25G. The core main control module has more resources to meet the needs of various functions of the power quality tester. The PGL25G in the core main control module is responsible for interacting with the signal conditioning and acquisition module, collecting the data collected by the ADC, and sending the data to the A40i. After receiving the data, the A40i calculates the proportion of various power quality line losses, saves the calculated data in the local SD card, and at the same time, sends the data to the cloud server through the 4G module. The core main control module can also be positioned and time-stamped through the GPS module, so that each power quality tester can measure at the same time and ensure the synchronization of the data.

[0103] In the embodiments of the present application, the 4G module is realized by EC20, and the power quality tester is connected to the cloud server through the SIM card and 4G technology, so that the cloud server can remotely receive data and control the power quality tester, set the timing to start, the timing to stop, and the current voltage ratio, etc. The data transmission protocol uses MQTT protocol, and the MQTT protocol adopts the publish / subscribe mode. Each power quality tester can publish information to the data topic, and the cloud server can receive data after subscribing to the data topic. The cloud server can also publish information to the control topic, and remotely set the power quality tester subscribing to the control topic.

[0104] In the embodiment of the application, the GPS module adopts U-BLOX NEO-6M module, and the position of the power quality tester can be located through a GPS signal, and time service is performed to synchronize the time of each device, so that each device synchronously measures.

[0105] In the embodiment of the application, in the signal conditioning and acquisition module, the acquisition chip adopts AD7606, the range of AD7606 is positive and negative 5V, and the highest can be 8 channels of synchronous sampling, and the sampling rate of each channel is up to 200 kHz. The signal conditioning module is divided into voltage and current channels, the current channel receives the voltage signal output by the current transformer, so it is directly connected to the ADC chip for acquisition, and the voltage part needs to collect 220V power supply signals. After the power supply signal is input, it is first divided by a resistor, and the signal that can be collected by the ADC is obtained, and then the subsequent circuit is protected and interference signals are suppressed through isolation and operational amplification. Finally, the common-mode voltage is suppressed through a differential amplifier, and is sent to the ADC for collection.

[0106] In the embodiment of the application, the power management module controls the charging and discharging of the power quality tester, when no external power is connected, internal lithium batteries are used for power supply, and after the external power is connected, the external power supplies the power quality tester, and charges the internal lithium batteries at the same time. The external power supply can select 9V-36V DC power supply or 80V-265V AC power supply.

[0107] Embodiment 3, this is an embodiment of the application, which is different from the first embodiment, and provides a power quality loss test system.

[0108] It should be noted that the technical scheme of the power quality loss test system belongs to the same concept as the technical scheme of the power quality loss test method described above. The details of the technical scheme of the power quality loss test system in the embodiment are not described in detail, and can be referred to the description of the technical scheme of the power quality loss test method.

[0109] The power quality loss test system in the embodiment comprises:

[0110] The acquisition module is configured to acquire three-phase voltage data and three-phase current data.

[0111] The calculation module is configured to calculate the equivalent total loss power in the power distribution network line based on the collected voltage and current data, through the apparent power value, voltage and resistance.

[0112] The decoupling module is configured to decouple the line loss in different parts based on the equivalent total loss power and the power factor of different line losses, to obtain additional line losses caused by different power quality problems.

[0113] The embodiment also provides an electronic device suitable for the case of the power quality loss test method, comprising:

[0114] The memory is used for storing computer executable instructions, and the processor is used for executing the computer executable instructions to realize the power quality loss test method proposed in the above embodiment.

[0115] The embodiment also provides a storage medium having a computer program stored thereon, and the computer program is executed by a processor to realize the power quality loss test method proposed in the above embodiment.

[0116] The storage medium proposed in the embodiment and the power quality loss test method proposed in the above embodiment belong to the same inventive concept, and the technical details not described in the embodiment can be referred to the above embodiment, and the embodiment has the same beneficial effects as the above embodiment.

[0117] Through the above description of the embodiments, those skilled in the art can clearly understand that the present application can be realized by means of software and necessary general hardware, and of course can also be realized by hardware, but in many cases the former is a better embodiment. Based on such understanding, the technical solutions of the present application can be embodied in the form of a software product, and the computer software product can be stored in a computer readable storage medium, such as a floppy disk, a read-only memory (ROM), a random access memory (RAM), a FLASH memory, a hard disk or an optical disk, etc., including a plurality of instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods of various embodiments of the present application.

[0118] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present application and not to limit the present application, although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present application, and all should be covered in the scope of the claims of the present application.

Claims

1. A power quality loss test method, characterized by, The method comprises: acquiring three-phase voltage data and three-phase current data; calculating equivalent total loss power in a power distribution network line based on the acquired voltage and current data, through apparent power value, voltage and resistance; based on the equivalent total loss power, combining power factors of different line losses, decoupling line loss items to obtain additional line losses caused by different power quality problems.

2. The power quality loss test method of claim 1, wherein: The calculation of the equivalent total loss power in the power distribution network line comprises: acquiring original voltage and current data of a three-phase nonlinear unbalanced system; converting voltage and current of the nonlinear unbalanced system into equivalent current value and voltage value of a linear balanced system through an equivalent process; calculating apparent power value based on the equivalent current value and voltage value through a power decomposition equation; calculating the equivalent total loss power in the power distribution network line based on the apparent power value and combining line resistance.

3. The power quality loss test method of claim 1 or 2, wherein: The equivalent process comprises: extracting fundamental wave and harmonic components of each phase voltage and current respectively; synthesizing equivalent voltage and equivalent current according to a specific weighting method; distinguishing fundamental wave part and total harmonic part in the equivalent voltage and the equivalent current.

4. The power quality loss test method of claim 3, wherein: The obtaining of various types of power quality additional line losses comprises: decomposing the equivalent total loss power into various types of additional line losses; defining four power factors of different line losses; calculating additional line losses caused by different power quality problems through power factor decoupling.

5. The power quality loss test method of claim 4, wherein: the equivalent total power loss ΔP eLoss is represented as: where S e is the equivalent apparent power, I e is the equivalent current of the nonlinear unbalanced system to the linear balanced system, U e is the equivalent voltage of the nonlinear unbalanced system to the linear balanced system, denotes the fundamental positive sequence active power, denotes the fundamental positive sequence reactive power, S U1 is the fundamental unbalanced apparent power, D eI is the equivalent current distortion power, D eU is the equivalent voltage distortion power, S eH is the equivalent harmonic apparent power, ΔP eP is the fundamental positive sequence active line loss, ΔP eQ is the fundamental positive sequence reactive additional line loss, ΔP eU is the unbalanced additional line loss, ΔP eH is the harmonic additional line loss.

6. The power quality loss test method of claim 5, wherein: The four power factors of different line losses are represented as: PF eP PF eQ PF eU PF eH PF 1+ PF eLoss PF PF ePU PF ePH PF 7. The power quality loss test method of claim 6, wherein: The additional line losses caused by different power quality problems are represented as: where ΔP eP is the fundamental positive sequence active line loss, ΔP eQ is the reactive additional line loss, ΔP eU is the unbalance additional line loss, and ΔP eH is the harmonic additional line loss.

8. A power quality loss test system applying the method according to any one of claims 1 to 7, characterized in that, The method comprises: an acquisition module for acquiring three-phase voltage data and three-phase current data; a calculation module for calculating equivalent total loss power in a power distribution network line based on the acquired voltage and current data, through apparent power value, voltage and resistance; a decoupling module for decoupling line loss items based on the equivalent total loss power, combining power factors of different line losses, and obtaining additional line losses caused by different power quality problems.

9. An electronic device, comprising: The method comprises: a memory for storing a program; a processor for loading the program to execute steps of the method according to any one of claims 1-7.

10. A computer-readable storage medium storing a program, characterized in that, The program is executed by the processor to implement steps of the method according to any one of claims 1-7.

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