Electric energy metering method and system based on load nonlinearity

Abstract

The invention discloses an electric energy metering method based on load nonlinearity, and the method comprises the steps: dividing sampling data collected by a collection device, obtaining a linear load and a non-linear load, and calculating the load nonlinearity of the non-linear load; calculating the total load power of the linear load and the nonlinear load according to the load nonlinearity; correcting a power factor based on the total load power to obtain a corrected power factor; the corrected power factor is used as an auxiliary index to carry out electricity charge adjustment, and an electric energy metering scheme is obtained; according to the invention, electricity charge adjustment is carried out based on the load nonlinearity, and the accuracy and reliability of electricity charge calculation can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of electric power systems, and in particular to an electric energy metering method and system based on load nonlinearity. Background Art

[0002] At present, there are three modes of electric energy measurement under the action of harmonics, namely, fundamental wave metering mode, full wave metering mode and fundamental wave and harmonic wave separate metering mode. The fundamental wave metering mode adopts fundamental wave electric energy meter to only measure the fundamental wave power consumed by the user. The full wave metering mode takes all the fundamental wave power consumed by the user and the harmonic power absorbed or emitted into the calculation of electricity charges. The fundamental wave and harmonic wave separate metering mode use fundamental wave meter and harmonic wave meter to measure the fundamental wave power and harmonic power consumed by the user respectively.

[0003] The current metering method in my country is full-wave metering. For non-linear loads, the use of full-wave metering will mean that not only will they not be subject to corresponding economic penalties for generating harmonic pollution, but they will also pay less fees than the electricity charges corresponding to the fundamental power they consume. For linear loads, while being subject to harmonic pollution, they will also have to pay more fees than the electricity charges corresponding to the fundamental power they consume. The current full-wave electricity metering model is irrational, ignoring the impact of harmonics on electricity metering, resulting in poor accuracy and reliability in electricity fee calculation. Summary of the invention

[0004] The embodiment of the present invention provides an electric energy metering method based on load nonlinearity, and adjusts the electricity fee based on the load nonlinearity, which can improve the accuracy and reliability of electricity fee calculation.

[0005] In a first aspect, an embodiment of the present invention provides an electric energy metering method based on load nonlinearity, comprising:

[0006] Dividing the sampled data collected by the collection device to obtain linear load and nonlinear load, and calculating the load nonlinearity of the nonlinear load;

[0007] Calculating the total load power of the linear load and the nonlinear load according to the load nonlinearity;

[0008] Correcting the power factor based on the total load power to obtain a corrected power factor;

[0009] The corrected power factor is used as an auxiliary indicator to adjust the electricity fee and obtain an electric energy metering solution.

[0010] Furthermore, the sampling data collected by the collection device is divided to obtain linear load and nonlinear load, including:

[0011] Acquire sampling data collected using a collection device;

[0012] Based on the load time domain equivalent model, the load data in the sampled data is linearized to obtain an equivalent linear load;

[0013] Calculating the linear equivalent impedance of the equivalent linear load;

[0014] The load data is divided into linear load and nonlinear load according to the linear equivalent impedance.

[0015] Further, the linear equivalent impedance includes a linear equivalent resistance and a linear equivalent inductance, and the load data is divided into a linear load and a nonlinear load according to the linear equivalent impedance, including:

[0016] For all the load data, respectively calculating the average values ​​of the linear equivalent resistance and the linear equivalent inductance to obtain a mean value of the linear equivalent resistance and a mean value of the linear equivalent inductance;

[0017] Calculating a linear equivalent resistance root mean square value and a linear equivalent inductance root mean square value according to the linear equivalent resistance mean value and the linear equivalent inductance mean value;

[0018] The load data is divided into a linear load and a nonlinear load based on the linear equivalent resistance root mean square value and the linear equivalent inductance root mean square value.

[0019] Further, the calculating the load nonlinearity of the nonlinear load includes:

[0020] For all the nonlinear loads, based on the average value of the linear equivalent resistance and the average value of the linear equivalent inductance, the load linear equivalent current and the load linear equivalent voltage are calculated;

[0021] Calculate the difference between the load linear equivalent current and the load linear equivalent voltage and the actual current sample value and the actual voltage sample value to obtain the current difference and the voltage difference;

[0022] The load nonlinearity is calculated based on the current difference and the voltage difference.

[0023] Further, the calculating the total load power of the linear load and the nonlinear load according to the load nonlinearity includes:

[0024] For each of the nonlinear loads, the product of the load nonlinearity and the fundamental wave power is calculated to obtain the harmonic power emitted by the nonlinear load, and the harmonic power is added to the fundamental wave power to obtain the total power of the nonlinear load;

[0025] For each of the linear loads, the difference between the fundamental wave power and the harmonic power absorbed by the linear load is calculated to obtain the total power of the linear load.

[0026] Furthermore, the power factor is corrected based on the total load power to obtain a corrected power factor, including:

[0027] Correcting the power factor based on the total power of the nonlinear load to obtain a corrected nonlinear load power factor;

[0028] The power factor is corrected based on the total power of the linear load to obtain a corrected linear load power factor.

[0029] Furthermore, the electricity fee is adjusted by using the corrected power factor as an auxiliary indicator to obtain an electric energy metering solution, including:

[0030] Calculating an electricity rate adjustment factor based on the corrected power factor;

[0031] An electric energy metering scheme is generated according to the electricity fee adjustment coefficient, the total load power, the unit price of electricity fee and time.

[0032] In a second aspect, an embodiment of the present invention provides an electric energy metering system based on load nonlinearity, comprising:

[0033] A load nonlinearity calculation module, used to divide the sampled data collected by the collection device to obtain linear load and nonlinear load, and calculate the load nonlinearity of the nonlinear load;

[0034] A load total power calculation module, used for calculating the total load power of the linear load and the nonlinear load according to the load nonlinearity;

[0035] A power factor correction module, used to correct the power factor based on the total power of the load to obtain a corrected power factor;

[0036] The electricity fee adjustment module is used to use the corrected power factor as an auxiliary indicator to adjust the electricity fee and obtain an electric energy metering solution.

[0037] Furthermore, the load nonlinearity calculation module is also used for:

[0038] Acquire sampling data collected using a collection device;

[0039] Based on the load time domain equivalent model, the load data in the sampled data is linearized to obtain an equivalent linear load;

[0040] Calculating the linear equivalent impedance of the equivalent linear load;

[0041] The load data is divided into linear load and nonlinear load according to the linear equivalent impedance.

[0042] Furthermore, the linear equivalent impedance includes a linear equivalent resistance and a linear equivalent inductance, and the load nonlinearity calculation module is further used for:

[0043] For all the load data, respectively calculating the average values ​​of the linear equivalent resistance and the linear equivalent inductance to obtain a mean value of the linear equivalent resistance and a mean value of the linear equivalent inductance;

[0044] Calculating a linear equivalent resistance root mean square value and a linear equivalent inductance root mean square value according to the linear equivalent resistance mean value and the linear equivalent inductance mean value;

[0045] The load data is divided into a linear load and a nonlinear load based on the linear equivalent resistance root mean square value and the linear equivalent inductance root mean square value.

[0046] Compared with the prior art, an electric energy metering method based on load nonlinearity provided by an embodiment of the present invention has the following beneficial effects: by dividing the sampled data collected by using an acquisition device, a linear load and a nonlinear load are obtained, and the load nonlinearity of the nonlinear load is calculated; according to the load nonlinearity, the total load power of the linear load and the nonlinear load is calculated; based on the total load power, the power factor is corrected to obtain a corrected power factor; the corrected power factor is used as an auxiliary indicator to adjust the electricity fee to obtain an electric energy metering scheme; the influence of harmonic electricity on electric energy metering is taken into account, the accuracy and reliability of electricity fee calculation can be improved, and the purpose of controlling harmonic pollution can be achieved by means of economic rewards and punishments. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] In order to more clearly illustrate the technical features of the embodiments of the present invention, the drawings required for use in the embodiments of the present invention will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

[0048] Figure 1 It is a flow chart of an electric energy metering method based on load nonlinearity provided by an embodiment of the present invention;

[0049] Figure 2 It is a schematic diagram of a time-domain equivalent model of an inductive load of an electric energy metering method based on load nonlinearity provided by an embodiment of the present invention;

[0050] Figure 3It is a schematic diagram of an IEEE14 node standard test system of an electric energy metering method based on load nonlinearity provided by an embodiment of the present invention;

[0051] Figure 4 It is a schematic diagram of voltage data of a nonlinear load NLA node of an electric energy metering method based on load nonlinearity provided by an embodiment of the present invention;

[0052] Figure 5 It is a schematic diagram of current data of a nonlinear load NLA node of an electric energy metering method based on load nonlinearity provided by an embodiment of the present invention;

[0053] Figure 6 It is a schematic diagram of voltage difference of a nonlinear load NLA node in an electric energy metering method based on load nonlinearity provided by an embodiment of the present invention;

[0054] Figure 7 It is a schematic diagram of current difference of a nonlinear load NLA node of an electric energy metering method based on load nonlinearity provided by an embodiment of the present invention;

[0055] Figure 8 is a comparison diagram of different metering modes of an electric energy metering method based on load nonlinearity provided by an embodiment of the present invention;

[0056] Fig. 9 It is a structural schematic diagram of an electric energy metering method based on load nonlinearity provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0057] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0058] In a first aspect, an embodiment of the present invention provides an electric energy metering method based on load nonlinearity, see Figure 1 , which is a flow chart of an embodiment of an electric energy metering method based on load nonlinearity provided by the present invention.

[0059] like Figure 1 As shown, the method comprises the following steps:

[0060] S1: dividing the sampled data collected by the collection device to obtain a linear load and a nonlinear load, and calculating the load nonlinearity of the nonlinear load;

[0061] S2: Calculating the total load power of the linear load and the nonlinear load according to the load nonlinearity;

[0062] S3: Correcting the power factor based on the total load power to obtain a corrected power factor;

[0063] S4: Using the corrected power factor as an auxiliary indicator to adjust the electricity fee, and obtaining an electric energy metering solution.

[0064] In the specific implementation, firstly, sampling is carried out at the key nodes of the power system using acquisition equipment to obtain sampling data, the sampling data is analyzed, and the load nonlinearity of the load is derived and calculated. According to the load nonlinearity, the total load power of the linear load and the nonlinear load is calculated; considering the impact of the load nonlinearity on the power factor, the power factor is corrected based on the total load power. The corrected power factor can improve the rationality of the metering scheme. The corrected power factor is used as an auxiliary indicator to adjust the electricity fee and generate a new type of electricity metering scheme.

[0065] In summary, the present invention divides the sampled data collected by the acquisition device to obtain linear load and nonlinear load, and calculates the load nonlinearity of the nonlinear load; according to the load nonlinearity, calculates the total load power of the linear load and the nonlinear load; based on the total load power, corrects the power factor to obtain a corrected power factor; uses the corrected power factor as an auxiliary indicator to adjust the electricity fee to obtain an electric energy metering scheme; the new harmonic electric energy metering scheme based on load nonlinearity of the present invention is more reasonable, and compared with the traditional full-wave metering scheme, it overcomes the shortcoming of ignoring the effect of harmonics on electric energy metering in the current electric energy metering mode, can achieve the purpose of controlling harmonic pollution by economic rewards and punishments, and can improve the accuracy and reliability of electricity fee calculation.

[0066] In an optional implementation manner, dividing the sampled data collected by the collection device to obtain the linear load and the nonlinear load includes:

[0067] Acquire sampling data collected using a collection device;

[0068] Based on the load time domain equivalent model, the load data in the sampled data is linearized to obtain an equivalent linear load;

[0069] Calculating the linear equivalent impedance of the equivalent linear load;

[0070] The load data is divided into linear load and nonlinear load according to the linear equivalent impedance.

[0071] Specifically, according to the structure and load distribution of the power system, representative sampling points are selected and data are collected using sampling equipment. For example, see Figure 2 , is a schematic diagram of the time domain equivalent model of the inductive load. When the load is an inductive load, according to the time domain equivalent model of the inductive load, we can get:

[0072]

[0073] Where i(t) represents the current at the common connection point of the PCC, u(t) represents the voltage at the common connection point of the PCC, R represents the equivalent resistance, L represents the equivalent inductance, i c (t) represents the load equivalent harmonic source.

[0074] After linearizing the nonlinear load, we can get:

[0075]

[0076] Among them, i linear (t) represents the current after linearization, R linear Represents the linear equivalent resistance obtained after linearization, L linear Represents the linear equivalent inductance obtained after linearization.

[0077] In the specific implementation, assuming that there are N continuous sample points in the sampled data, the above formula can be obtained:

[0078]

[0079] Wherein, n represents the nth sample, n=0,1,…N.

[0080] Further, we can get:

[0081]

[0082] make:

[0083]

[0084] Combining equation (4) and equation (5), we can get the linear equivalent impedance of the inductive load:

[0085]

[0086] Among them, R linear Represents the linear equivalent resistance, L linear Represents the linear equivalent inductance.

[0087] When the load is a capacitive load, following the above solution process of the linear equivalent impedance of the inductive load, the linear equivalent impedance of the capacitive load can be obtained as:

[0088]

[0089] According to the linear equivalent impedance obtained by solution, the load data is divided into linear load and nonlinear load.

[0090] In an optional implementation manner, the linear equivalent impedance includes a linear equivalent resistance and a linear equivalent inductance, and the dividing the load data into a linear load and a nonlinear load according to the linear equivalent impedance includes:

[0091] For all the load data, respectively calculating the average values ​​of the linear equivalent resistance and the linear equivalent inductance to obtain a mean value of the linear equivalent resistance and a mean value of the linear equivalent inductance;

[0092] Calculating a linear equivalent resistance root mean square value and a linear equivalent inductance root mean square value according to the linear equivalent resistance mean value and the linear equivalent inductance mean value;

[0093] The load data is divided into a linear load and a nonlinear load based on the linear equivalent resistance root mean square value and the linear equivalent inductance root mean square value.

[0094] Specifically, assuming that there are N consecutive sample points in the sampled data, the average values ​​of the linear equivalent resistance and the linear equivalent inductance are calculated for the load data of all sample points to obtain the average linear equivalent resistance and the average linear equivalent inductance. The specific formula is as follows:

[0095]

[0096] in, represents the linear equivalent resistance mean, Represents the mean value of the linear equivalent inductance.

[0097] The root mean square value of the linear equivalent resistance mean value and the linear equivalent inductance mean value is obtained to obtain the linear equivalent resistance root mean square value and the linear equivalent inductance root mean square value. The specific formula is as follows:

[0098]

[0099] Among them, RMS R Indicates the linear equivalent resistance root mean square value, RMS L Represents the RMS value of linear equivalent inductance.

[0100] It can be understood that the RMS value reflects the degree of change of the linear equivalent impedance parameter of the load, which can be used as a basis for distinguishing linear load from nonlinear load. Therefore, the load data can be divided into linear load and nonlinear load.

[0101] In an optional implementation manner, the calculating the load nonlinearity of the nonlinear load includes:

[0102] For all the nonlinear loads, based on the average value of the linear equivalent resistance and the average value of the linear equivalent inductance, the load linear equivalent current and the load linear equivalent voltage are calculated;

[0103] Calculate the difference between the load linear equivalent current and the load linear equivalent voltage and the actual current sample value and the actual voltage sample value to obtain the current difference and the voltage difference;

[0104] The load nonlinearity is calculated based on the current difference and the voltage difference.

[0105] Specifically, the linear equivalent resistance mean value and the linear equivalent inductance mean value obtained above are substituted into formula (2) to obtain the load linear equivalent current, and the difference between the load linear equivalent current and the measured current sample value is calculated to obtain the current difference T i (t), the specific formula is as follows:

[0106]

[0107] Substituting the linear equivalent resistance mean value and the linear equivalent inductance mean value obtained above into the following formula (11), the load linear equivalent voltage can be obtained. The specific formula is as follows:

[0108]

[0109] Calculate the difference between the load linear equivalent voltage and the measured voltage sample value to obtain the voltage difference T u (t), the specific formula is as follows:

[0110]

[0111] The current difference and the voltage difference are multiplied, and the root mean square value of the product is obtained to obtain the load nonlinearity LNF. The specific formula is as follows:

[0112]

[0113] In an optional implementation manner, calculating the total load power of the linear load and the nonlinear load according to the load nonlinearity includes:

[0114] For each of the nonlinear loads, the product of the load nonlinearity and the fundamental wave power is calculated to obtain the harmonic power emitted by the nonlinear load, and the harmonic power is added to the fundamental wave power to obtain the total power of the nonlinear load;

[0115] For each of the linear loads, the difference between the fundamental wave power and the harmonic power absorbed by the linear load is calculated to obtain the total power of the linear load.

[0116] Specifically, for each of the nonlinear loads, the total power of the nonlinear load is calculated according to the load nonlinearity and the fundamental wave power. The specific formula is:

[0117] P Nlinear-new =P1+P Nlinear-new-h (14);

[0118] P Nlinear-new-h =P1×LNF (15);

[0119] Among them, P Nlinear-new represents the total power of nonlinear load, P1 represents the fundamental power, P Nlinear-new-h It represents the harmonic power emitted by nonlinear load, and LNF represents the load nonlinearity;

[0120] For each of the linear loads, the total linear load power is calculated based on the fundamental power and the absorbed harmonic power. The specific formula is:

[0121] P linear-new =P1-P h-measure (16);

[0122] Among them, P linear-new Indicates the total power of the linear load, P1 indicates the fundamental power, P h-measure Indicates the measured value of harmonic power absorbed by the linear load.

[0123] In an optional implementation manner, the correcting the power factor based on the total load power to obtain a corrected power factor includes:

[0124] Correcting the power factor based on the total power of the nonlinear load to obtain a corrected nonlinear load power factor;

[0125] The power factor is corrected based on the total power of the linear load to obtain a corrected linear load power factor.

[0126] Specifically, in order to further improve the rationality of the metering scheme, based on the non-consideration that the power department uses electric energy as an economic indicator of electricity charges, it also uses power factor as an auxiliary indicator for adjusting electricity charges. Therefore, taking both into account, the new electric energy metering scheme is as follows: the linear load total power corrects the power factor to obtain the corrected nonlinear load power factor. The specific formula is:

[0127]

[0128] Among them, PF Nlinear Indicates the corrected nonlinear load power factor, P Nlinear-new represents the total power of nonlinear load, Q represents the reactive power absorbed by the load;

[0129] The power factor is corrected based on the total power of the linear load to obtain a corrected linear load power factor. The specific formula is:

[0130]

[0131] Among them, PF linear Indicates the corrected linear load power factor, P linear-new represents the total power of the linear load, and Q represents the reactive power absorbed by the load.

[0132] In an optional implementation manner, the method of using the corrected power factor as an auxiliary indicator to adjust the electricity fee to obtain an electric energy metering solution includes:

[0133] Calculating an electricity rate adjustment factor based on the corrected power factor;

[0134] An electric energy metering scheme is generated according to the electricity fee adjustment coefficient, the total load power, the unit price of electricity fee and time.

[0135] Specifically, the electricity fee adjustment coefficient is obtained according to the corrected power factor, and the electricity fee adjustment coefficient is as follows:

[0136] β = f(PF) (19);

[0137] Among them, β represents the electricity fee adjustment coefficient, f represents the mapping relationship between the electricity fee adjustment coefficient formulated by the power department and the power factor, and PF represents the power factor of the load.

[0138] According to the electricity fee adjustment coefficient, the total load power, the unit price of electricity fee and time, the electricity metering scheme is generated as follows:

[0139]

[0140] Among them, M Nlinear-new and M linear-new The energy metering scheme for nonlinear load and linear load, P Nlinear-new Represents the total power of nonlinear load, P linear-new represents the total power of linear load, T represents time, and A represents the unit price of electricity.

[0141] For example, the following is an embodiment of the electric energy metering method based on load nonlinearity of the present application. Figure 3 The IEEE 14-node system shown in the figure is used as the basic model for simulation. Two simulations are performed. The relevant parameters of simulation 1 are set as shown in Table 1:

[0142] Table 1 Total harmonic power of load under different working conditions

[0143]

[0144] Simulation 2 adds random fluctuations with a mean of 0 and a variance of 0.1 to the harmonic currents of harmonic sources NLB and NLC based on simulation 1 to test the stability of the load nonlinearity calculation method, obtain the measured values ​​of voltage, current and power of loads NLA and LLD, take 1000 sample points in total, and assume that the electricity fee adjustment coefficient β is shown in Table 2 below:

[0145] Table 2 Electricity fee adjustment coefficient

[0146]

[0147] For example, see Figure 4 and Figure 5 , are the voltage and current simulation results of NLA obtained based on simulation 2. According to the equivalent linear impedance calculation process, the equivalent linear resistance and inductance of the load NLA are calculated as follows: Substituting the simulation data into equations (17), (18) and (19), the voltage difference and current difference are calculated, as follows: Figure 6 and Figure 7 shown.

[0148] The load nonlinearity of NLA is further obtained as LNF = 0.347. Similarly, according to the simulation data of simulation 1, the equivalent linear resistance and inductance of NLA are calculated as R linear =73.32Ω, L linear =60.88mH. It can be seen that the relative errors of the equivalent linear resistance calculation results in the two simulation situations are very small. At this time, the load nonlinearity LNF of NLA is 0.338, and the error relative to simulation 2 is 2.59%. Although the error has increased, it still has high accuracy, which proves that the load nonlinear negative method has high stability and reliability.

[0149] After obtaining the load nonlinearity and related simulation measured data, an example analysis can be performed according to the electric energy metering scheme described in the present invention, and the electricity charges under the fundamental wave metering mode, the full wave metering mode and the electric energy metering mode of the present invention are compared. To simplify the analysis, only the power and electricity charge adjustment coefficients are considered, without considering the unit price of electricity and time. Based on the data of simulation 1, the nonlinear load NLA and the linear load LLD are analyzed respectively, and it can be obtained that: the fundamental wave active power value of NLA is 4.97MW, the load nonlinearity is 0.338, and the total reactive power value is 2.17MVar; the fundamental wave active power value of LLD is 7.31MW, the harmonic active power value is 0.30MW, and the total reactive power value is 2.22Mvar. Substituting the above data into the metering scheme, the metering results of the linear load and the nonlinear load are obtained as follows: Figure 8 shown.

[0150] In a second aspect, an embodiment of the present invention provides an electric energy metering system based on load nonlinearity, see Fig. 9 , which is a schematic diagram of the structure of an electric energy metering system based on load nonlinearity provided by an embodiment of the present invention.

[0151] like Fig. 9 As shown, the system comprises:

[0152] The load nonlinearity calculation module 21 is used to divide the sampled data collected by the collection device to obtain linear load and nonlinear load, and calculate the load nonlinearity of the nonlinear load;

[0153] A load total power calculation module 22, used to calculate the total load power of the linear load and the nonlinear load according to the load nonlinearity;

[0154] A power factor correction module 23, used to correct the power factor based on the total power of the load to obtain a corrected power factor;

[0155] The electricity fee adjustment module 24 is used to use the corrected power factor as an auxiliary indicator to adjust the electricity fee and obtain an electric energy metering solution.

[0156] In an optional implementation, the load nonlinearity calculation module 21 is further used for:

[0157] Acquire sampling data collected using a collection device;

[0158] Based on the load time domain equivalent model, the load data in the sampled data is linearized to obtain an equivalent linear load;

[0159] Calculating the linear equivalent impedance of the equivalent linear load;

[0160] The load data is divided into linear load and nonlinear load according to the linear equivalent impedance.

[0161] In an optional implementation manner, the linear equivalent impedance includes a linear equivalent resistance and a linear equivalent inductance, and the load nonlinearity calculation module 21 is further used for:

[0162] For all the load data, respectively calculating the average values ​​of the linear equivalent resistance and the linear equivalent inductance to obtain a mean value of the linear equivalent resistance and a mean value of the linear equivalent inductance;

[0163] Calculating a linear equivalent resistance root mean square value and a linear equivalent inductance root mean square value according to the linear equivalent resistance mean value and the linear equivalent inductance mean value;

[0164] The load data is divided into a linear load and a nonlinear load based on the linear equivalent resistance root mean square value and the linear equivalent inductance root mean square value.

[0165] In an optional implementation, the load nonlinearity calculation module 21 is further used for:

[0166] For all the nonlinear loads, based on the average value of the linear equivalent resistance and the average value of the linear equivalent inductance, the load linear equivalent current and the load linear equivalent voltage are calculated;

[0167] Calculate the difference between the load linear equivalent current and the load linear equivalent voltage and the actual current sample value and the actual voltage sample value to obtain the current difference and the voltage difference;

[0168] The load nonlinearity is calculated based on the current difference and the voltage difference.

[0169] In an optional implementation, the load total power calculation module 22 is further used for:

[0170] For each of the nonlinear loads, the product of the load nonlinearity and the fundamental wave power is calculated to obtain the harmonic power emitted by the nonlinear load, and the harmonic power is added to the fundamental wave power to obtain the total power of the nonlinear load;

[0171] For each of the linear loads, the difference between the fundamental wave power and the harmonic power absorbed by the linear load is calculated to obtain the total power of the linear load.

[0172] In an optional implementation, the power factor correction module 23 is further used for:

[0173] Correcting the power factor based on the total power of the nonlinear load to obtain a corrected nonlinear load power factor;

[0174] The power factor is corrected based on the total power of the linear load to obtain a corrected linear load power factor.

[0175] In an optional implementation, the electricity fee adjustment module 24 is further used for:

[0176] Calculating an electricity rate adjustment factor based on the corrected power factor;

[0177] An electric energy metering scheme is generated according to the electricity fee adjustment coefficient, the total load power, the unit price of electricity fee and time.

[0178] The above description is only a preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto. It should be pointed out that for those skilled in the art, several equivalent obvious variations and / or equivalent substitutions can be made without departing from the technical principles of the present invention. These obvious variations and / or equivalent substitutions should also be regarded as the protection scope of the present invention.

Claims

1. An electric energy metering method based on load nonlinearity, characterized in that: include: Dividing the sampled data collected by the collection device to obtain linear load and nonlinear load, and calculating the load nonlinearity of the nonlinear load; Calculating the total load power of the linear load and the nonlinear load according to the load nonlinearity; Correcting the power factor based on the total load power to obtain a corrected power factor; The corrected power factor is used as an auxiliary indicator to adjust the electricity fee and obtain an electric energy metering solution.

2. The electric energy metering method based on load nonlinearity according to claim 1, characterized in that: The sampling data collected by the collection device is divided to obtain linear load and nonlinear load, including: Acquire sampling data collected using a collection device; Based on the load time domain equivalent model, the load data in the sampled data is linearized to obtain an equivalent linear load; Calculating the linear equivalent impedance of the equivalent linear load; The load data is divided into linear load and nonlinear load according to the linear equivalent impedance.

3. The electric energy metering method based on load nonlinearity according to claim 2, characterized in that: The linear equivalent impedance includes a linear equivalent resistance and a linear equivalent inductance. Then, dividing the load data into a linear load and a nonlinear load according to the linear equivalent impedance includes: For all the load data, respectively calculating the average values ​​of the linear equivalent resistance and the linear equivalent inductance to obtain a mean value of the linear equivalent resistance and a mean value of the linear equivalent inductance; Calculating a linear equivalent resistance root mean square value and a linear equivalent inductance root mean square value according to the linear equivalent resistance mean value and the linear equivalent inductance mean value; The load data is divided into a linear load and a nonlinear load based on the linear equivalent resistance root mean square value and the linear equivalent inductance root mean square value.

4. The electric energy metering method based on load nonlinearity according to claim 3, characterized in that: The calculating the load nonlinearity of the nonlinear load comprises: For all the nonlinear loads, based on the average value of the linear equivalent resistance and the average value of the linear equivalent inductance, the load linear equivalent current and the load linear equivalent voltage are calculated; Calculate the difference between the load linear equivalent current and the load linear equivalent voltage and the actual current sample value and the actual voltage sample value to obtain the current difference and the voltage difference; The load nonlinearity is calculated based on the current difference and the voltage difference.

5. The electric energy metering method based on load nonlinearity according to claim 1, characterized in that: The calculating the total load power of the linear load and the nonlinear load according to the load nonlinearity includes: For each of the nonlinear loads, the product of the load nonlinearity and the fundamental wave power is calculated to obtain the harmonic power emitted by the nonlinear load, and the harmonic power is added to the fundamental wave power to obtain the total power of the nonlinear load; For each of the linear loads, the difference between the fundamental wave power and the harmonic power absorbed by the linear load is calculated to obtain the total power of the linear load.

6. The electric energy metering method based on load nonlinearity according to claim 5, characterized in that: The correcting the power factor based on the total load power to obtain a corrected power factor includes: Correcting the power factor based on the total power of the nonlinear load to obtain a corrected nonlinear load power factor; The power factor is corrected based on the total power of the linear load to obtain a corrected linear load power factor.

7. The electric energy metering method based on load nonlinearity according to claim 1, characterized in that: The method of using the corrected power factor as an auxiliary indicator to adjust the electricity fee to obtain an electric energy metering solution includes: Calculating an electricity rate adjustment factor based on the corrected power factor; An electric energy metering scheme is generated according to the electricity fee adjustment coefficient, the total load power, the unit price of electricity fee and time.

8. An electric energy metering system based on load nonlinearity, characterized in that: include: A load nonlinearity calculation module, used to divide the sampled data collected by the collection device to obtain linear load and nonlinear load, and calculate the load nonlinearity of the nonlinear load; A load total power calculation module, used for calculating the total load power of the linear load and the nonlinear load according to the load nonlinearity; A power factor correction module, used to correct the power factor based on the total power of the load to obtain a corrected power factor; The electricity fee adjustment module is used to use the corrected power factor as an auxiliary indicator to adjust the electricity fee and obtain an electric energy metering solution.

9. The electric energy metering system based on load nonlinearity according to claim 8, characterized in that: The load nonlinearity calculation module is also used for: Acquire sampling data collected using a collection device; Based on the load time domain equivalent model, the load data in the sampled data is linearized to obtain an equivalent linear load; Calculating the linear equivalent impedance of the equivalent linear load; The load data is divided into linear load and nonlinear load according to the linear equivalent impedance.

10. The electric energy metering system based on load nonlinearity according to claim 9, characterized in that: The linear equivalent impedance includes a linear equivalent resistance and a linear equivalent inductance, and the load nonlinearity calculation module is further used for: For all the load data, respectively calculating the average values ​​of the linear equivalent resistance and the linear equivalent inductance to obtain a mean value of the linear equivalent resistance and a mean value of the linear equivalent inductance; Calculating a linear equivalent resistance root mean square value and a linear equivalent inductance root mean square value according to the linear equivalent resistance mean value and the linear equivalent inductance mean value; The load data is divided into a linear load and a nonlinear load based on the linear equivalent resistance root mean square value and the linear equivalent inductance root mean square value.

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