CN113092926A - 10kV true test load configuration platform - Google Patents
10kV true test load configuration platform Download PDFInfo
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- CN113092926A CN113092926A CN202110531791.0A CN202110531791A CN113092926A CN 113092926 A CN113092926 A CN 113092926A CN 202110531791 A CN202110531791 A CN 202110531791A CN 113092926 A CN113092926 A CN 113092926A
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- 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
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- 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
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
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Abstract
The invention discloses a 10kV true test load configuration platform, which comprises a 10kV incoming line power supply, an isolation transformer, a bus, a plurality of lines, a zero sequence load, a branch line, an access configuration unit, a load system, a bus and a load regulation and control unit, wherein the 10kV incoming line power supply is connected with the isolation transformer; the isolation transformer is connected with the bus; the bus is connected with a plurality of lines; each line is provided with a zero sequence load, each line is provided with a plurality of branch lines, each branch line is provided with a zero sequence load, each branch line is connected with a load system through an access configuration unit, and the load system is connected with a load regulation and control unit through a bus. The 10kV true test load configuration platform provided by the invention configures test loads on the basis of the traditional true test, more truly restores a real scene, avoids the influence on the application effect of related equipment due to the fluctuation, the trend direction and the type of the distribution network load, and provides a solution for carrying out a test of a loaded test in a 10kV true test environment.
Description
Technical Field
The invention belongs to the technical field of detection of intelligent power distribution equipment, and particularly relates to a 10kV true test load configuration platform.
Background
The problems of grounding electric arc, arc grounding overvoltage, step voltage and the like caused by single-phase grounding faults easily cause electric fire, short-circuit faults and personal safety accidents. In recent years, a large number of novel earth fault processing technologies and devices are developed at home and abroad for solving the problem of single-phase earth fault of a power distribution network, but the application effect on the site is not ideal. The main reason is that the grounding fault characteristics of the power distribution network are extremely complex and are easily influenced by system conditions and fault media, and the real fault characteristics of a field are difficult to simulate by adopting the traditional simulation test or dynamic test, so that the real performance of the tested equipment or technology under the field conditions is difficult to reflect. In order to improve the efficiency of research and development and detection work, a test method for highly restoring scene and characteristics of field ground fault must be provided.
The true test in the power system is an empirical test carried out by reproducing a real environment on site by using real power equipment. The true test avoids errors caused by model design and parameter setting in the traditional test method, can reproduce real operation and fault scenes in a short time, records complete test phenomena and data, and does not influence power supply of users.
The rapid development of the true test technology of the power distribution network provides an effective means for the power distribution intelligent equipment to carry out technical route verification, function analysis and performance evaluation under the real power distribution network environment, can comprehensively evaluate the performance level of the equipment before network access application, shorten the research and development period of a novel product, rapidly improve the product quality and have strong application value. Along with the continuous development of the distribution automation technology, a large number of distribution intelligent devices such as a primary and secondary fusion switch, a fault indicator and a line protection device are applied, true tests of related devices are developed, the technical level of the existing devices is comprehensively evaluated, the performance and the quality of the network access devices are guaranteed, and the method has important significance for safe and stable operation of a distribution network.
In a traditional 10kV distribution network true type test, due to system loss and other reasons, the influence of factors such as zero sequence voltage, zero sequence current and the like is usually only considered, test loads are not configured, and practical application conditions show that the fluctuation, the trend direction and the type of the distribution network loads can influence the application effect of related equipment.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a 10kV true test load configuration platform, and provides a solution for carrying out a test of a load test in a 10kV true test environment.
In order to achieve the purpose, the invention adopts the following technical scheme:
a10 kV true test load configuration platform comprises a 10kV incoming line power supply, an isolation transformer, a bus, a plurality of lines, a zero sequence load, a branch line, an access configuration unit, a load system, a bus and a load regulation and control unit, wherein the 10kV incoming line power supply is connected with the isolation transformer; the isolation transformer is connected with the bus; the bus is connected with a plurality of lines; each line is provided with a zero sequence load, each line is provided with a plurality of branch lines, each branch line is provided with a zero sequence load, each branch line is connected with a load system through an access configuration unit, and the load system is connected with a load regulation and control unit through a bus.
Further, the load system comprises a steady-state constant load, an interference load and an energy-saving customized load.
Further, the interference load includes a transient interference load and a steady interference load.
Furthermore, the zero sequence load is a capacitance load to ground, the scale of a power grid to be simulated is represented, the needed system zero sequence capacitor is configured by adopting an '8421' method, and the configured overall capacitor current considers the typical grounding operation mode of the distribution network, so that the configuration requirements of typical zero sequence parameters respectively suitable for the neutral point ungrounded system 10A, the arc suppression coil grounding system 100A and the small resistance grounding system 150A can be realized.
Further, the steady-state constant load is a steady operation load in the test, and the configuration capacity S1 meets S1 epsilon (0, 50% ST), wherein ST is the rated capacity of the test transformer, namely the steady-state constant load capacity is required to be not more than 50% of the rated capacity of the test transformer.
Further, the steady-state constant load setting adopts a level difference adjusting mode to realize flexible adjustment of the load size under high cost performance.
Further, the transient disturbance load comprises a motor impact load and a no-load transformer excitation inrush current load, and the capacity configuration is set to be 20% of the system test capacity.
Further, the steady-state interference load is a harmonic load, the harmonic amplitude and the frequency can be configured, the capacity is set to be more than 10% of the system test capacity, and the steady-state interference load is realized in a stepless continuous adjustment mode.
Furthermore, the energy-saving customized load adopts an energy-feedback electronic load mode of a back-to-back structure, and four-quadrant operation is realized; the energy-saving customized load has customized load setting capacity, can be configured with load fluctuation at will and simulates the new energy power generation load characteristic; the capacity configuration is not less than 50% of the capacity of the test transformer.
Further, the equivalent model of the no-load transformer magnetizing inrush current comprises three parts: alternating current power supply, resistance and inductance of coil, transformer model; the alternating current power supply comprises an internal resistor, an internal inductor and an alternating current voltage source; the transformer model comprises resistance of a primary winding, equivalent resistance of iron core loss, induction inductance of an iron core magnetic circuit, an air gap and induction inductance of a coil magnetic circuit;
with RtRepresenting the resistance of the primary winding of the transformer, Liron(t) represents the inductance of the core magnetic circuit, LairRepresenting the air gap and the inductive inductance, R, of the coil magnetic circuitloss(t) equivalent resistance representing core loss, RsIndicating the internal resistance, L, of the AC power supplysRepresenting the internal inductance, R, of an AC power supplylineDenotes the coil resistance, LlineRepresenting coil inductance, V representing AC supply voltage, and V ═ Emsin (ω t + θ), i (t) denotes magnetizing inrush current, iloss(t) equivalent current, i, representing core lossiron(t) represents an induced current of the core magnetic circuit;
the inductive inductance of the core magnetic circuit is determined by
In the formula, N is the number of turns of the coil; a. thecIs the sectional area of the iron core; l' is the length of the iron core; mu is magnetic core magnetic conductivity;
μ is determined by
In the formula, H is magnetic field intensity, and B is magnetic induction intensity induced by the magnetic field intensity;
the H-B curve can be fitted by a tangent function as follows:
H(t)＝f(tan[kB(t)])
the induced current of the core magnetic circuit is determined by:
per kilogram of core loss of
Ploss＝c1tan(c0[B(t)]2)
Wherein c0 and c1 are constants;
iloss(t) and Rloss(t) are respectively determined by the following formula
In the formula cwThe weight of the iron core;
finally, the relation of each parameter of the equivalent model of the transformer magnetizing inrush current is as follows:
compared with the prior art, the 10kV true test load configuration platform provided by the invention has the following beneficial effects:
in a traditional 10kV distribution network true type test, due to system loss and other reasons, the influence of factors such as zero sequence voltage, zero sequence current and the like is usually only considered, test loads are not configured, and practical application conditions show that the fluctuation, the trend direction and the type of the distribution network loads can influence the application effect of related equipment.
The 10kV true test load configuration platform provided by the invention has the following test load types: the system comprises a zero sequence load, a steady-state constant load, an interference load and an energy-saving customized load, wherein the interference load comprises a transient interference load and a steady-state interference load.
The zero sequence load is a ground capacitance load and represents the scale of a power grid to be simulated; the steady-state constant load is a stable operation load in the test; the interference load is used for representing disturbance load existing in the operation process of the distribution network and evaluating the action reliability of the distribution equipment; the energy-saving customized load is a common test load, has customized load setting capacity, and can be used for arbitrarily configuring load fluctuation, simulating new energy power generation load characteristics and the like.
The 10kV true test load configuration platform provided by the invention provides a solution for carrying out a test of a loaded test in a 10kV true test environment.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings.
FIG. 1 is a schematic diagram of a 10kV true test load configuration platform provided by the invention;
fig. 2 is an equivalent model of the magnetizing inrush current of the no-load transformer in the invention.
In the figure, 1, an incoming line power supply, 2, an isolation transformer, 3, a bus, 4, a line, 5, a zero sequence load, 6, a branch line, 7, an access configuration unit, 8, a load system, 9, a bus, 10, a load regulation and control unit, 81, a steady state constant load, 821, a transient state interference load, 822, a steady state interference load and 83, an energy-saving customized load.
Detailed Description
The present invention will be further described with reference to the following examples. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, fig. 1 is a schematic diagram of a 10kV true test load configuration platform provided by the present invention, the 10kV true test load configuration platform provided by the present invention includes a 10kV incoming line power supply 1, an isolation transformer 2, a bus 3, a plurality of lines 4, a zero sequence load 5, a branch line 6, an access configuration unit 7, a load system 8, a bus 9, and a load regulation unit 10, the 10kV incoming line power supply 1 is connected with the isolation transformer 2; the isolation transformer 2 is connected with the bus 3; the bus 3 is connected with a plurality of lines 4; each line 4 is provided with a zero sequence load 5, each line 4 is provided with a plurality of branch lines 6, each branch line 6 is provided with a zero sequence load 5, each branch line 6 is connected with a load system 8 through an access configuration unit 7, and the load system 8 is connected with a load regulation and control unit 10 through a bus 9. Wherein the load system 8 comprises a steady-state constant load 81, an interference load, an energy-saving customized load 83.
The zero sequence load 5 is a ground capacitance load, represents the scale of a power grid to be simulated, the needed system zero sequence capacitance can be configured by adopting an '8421' method, and the configuration requirements of typical zero sequence parameters of a neutral point ungrounded system 10A, an arc suppression coil grounding system 100A and a small resistance grounding system 150A can be met by considering the typical grounding operation mode of a distribution network for the configured overall capacitance current.
The steady-state constant load 81 is a steady operation load in a test, and the configured capacity S1 is required to meet the requirement of S1 epsilon (0, 50% ST), wherein ST is the rated capacity of a test transformer, namely the capacity of the steady-state constant load 81 is required to be not more than 50% of the rated capacity of the test transformer, so that the energy-saving requirement in the test process is met, a certain steady load operation level is ensured on one hand, and the system stability is ensured when other load types are accessed; the steady-state constant load 81 setting can adopt a step difference adjusting mode to realize flexible adjustment of the load size under high cost performance.
The interference load is used for representing disturbance load existing in the operation process of the distribution network and evaluating the action reliability of the distribution equipment; the interference load comprises a transient interference load 821 and a steady interference load 822, wherein the transient interference load 821 comprises a motor impact load, a no-load transformer excitation inrush current load and the like, and the capacity configuration can be set to be about 20% of the system test capacity due to the fact that the transient load is short in duration; the steady-state interference load 822 is mainly a harmonic load, the amplitude and the frequency of the harmonic load are configurable, the capacity can be set to be more than 10% of the system test capacity, and the method is realized in a stepless continuous adjustment mode.
The energy-saving customized load 83 is a common test load, on one hand, the energy-saving customized load has an energy-saving effect by adopting an energy-feedback electronic load form of a back-to-back structure and four-quadrant operation, and on the other hand, the customized load setting capability is realized, and the load fluctuation, the new energy power generation load characteristic simulation and the like can be configured at will; the energy-saving customized load 83 capacity is set in consideration of the vast majority of test scenarios, and the recommended capacity is not less than 50% of the test transformer capacity.
Referring to fig. 2, fig. 2 is an equivalent model of the no-load transformer inrush current in the present invention, and the equivalent model of the no-load transformer inrush current includes three parts: alternating current power supply, resistance and inductance of coil, transformer model; the alternating current power supply comprises an internal resistor, an internal inductor and an alternating current voltage source; the transformer model comprises the resistance of a primary winding, the equivalent resistance of iron core loss, the induction inductance of an iron core magnetic circuit, an air gap and the induction inductance of a coil magnetic circuit.
In FIG. 2, RtIs the resistance of the primary winding of the transformer, Liron(t) is the induction inductance of the core magnetic circuit, LairAir gap and inductive inductance of coil magnetic circuit, Rloss(t) equivalent resistance of core loss, RsIs an internal resistance of the AC power supply, LsIs an internal inductance, R, of an AC power supplylineIs the coil resistance, LlineIs a coil inductance, V is an AC power supply voltage, and V is equal to Emsin (ω t + θ), i (t) is the magnetizing inrush current, iloss(t) is the equivalent current of core loss, iironAnd (t) is the induced current of the iron core magnetic circuit.
The inductive inductance of the core magnetic circuit is determined by
In the formula, N is the number of turns of the coil; a. thecIs the sectional area of the iron core; l' is the length of the iron core; mu is magnetic core magnetic conductivity;
μ is determined by
In the formula, H is magnetic field intensity, and B is magnetic induction intensity induced by the magnetic field intensity;
the H-B curve can be fitted by a tangent function as follows:
H(t)＝f(tan[kB(t)])
the induced current of the core magnetic circuit is determined by:
per kilogram of core loss of
Ploss＝c1tan(c0[B(t)]2)
Wherein c0 and c1 are constants;
iloss(t) and Rloss(t) are respectively determined by the following formula
In the formula cwThe weight of the iron core;
finally, the relation of each parameter of the equivalent model of the transformer magnetizing inrush current is as follows:
the 10kV true test load configuration platform provided by the invention is used for configuring test loads on the basis of the traditional 10kV distribution network true test, so that the true test can be more truly restored to a real scene, the influence on the application effect of related equipment due to the fluctuation, the trend direction and the type of the distribution network load is avoided, a solution is provided for carrying out a test with a load under a 10kV true test environment, and the platform has strong practicability in the technical field of electric power tests.
Thus, it should be appreciated by those skilled in the art that while a number of exemplary embodiments of the invention have been illustrated and described in detail herein, many other variations or modifications consistent with the principles of the invention may be directly determined or derived from the disclosure of the present invention without departing from the spirit and scope of the invention. Accordingly, the scope of the invention should be understood and interpreted to cover all such other variations or modifications.
Claims (10)
1. A10 kV true test load configuration platform is characterized by comprising a 10kV incoming line power supply, an isolation transformer, a bus, a plurality of lines, a zero sequence load, a branch line, an access configuration unit, a load system, a bus and a load regulation and control unit, wherein the 10kV incoming line power supply is connected with the isolation transformer; the isolation transformer is connected with the bus; the bus is connected with the plurality of lines; the zero sequence load is arranged on each line, the plurality of branch lines are arranged on each line, the zero sequence load is arranged on each branch line, each branch line is connected with the load system through an access configuration unit, and the load system is connected with the load regulation and control unit through the bus.
2. The 10kV true test load configuration platform according to claim 1, wherein the load system comprises a steady-state constant load, an interference load and an energy-saving customized load.
3. The platform of claim 2, wherein the disturbance loads comprise transient disturbance loads and steady disturbance loads.
4. The 10kV true test load configuration platform according to claim 1, wherein the zero-sequence load is a ground capacitance load, the scale of a power grid to be simulated is represented, a required system zero-sequence capacitance is configured by adopting an '8421' method, and the configured overall capacitance current considers a typical grounding operation mode of a distribution network, so that the configuration requirements of typical zero-sequence parameters respectively applicable to a neutral point ungrounded system 10A, an arc suppression coil grounding system 100A and a small resistance grounding system 150A can be realized.
5. The 10kV true test load configuration platform as claimed in claim 2, wherein the steady-state constant load is a steady operation load in a test, and the configuration capacity S1 meets S1 e (0, 50% ST), where ST is a rated capacity of a test transformer, that is, the steady-state constant load capacity is required not to exceed 50% of the rated capacity of the test transformer.
6. The platform of claim 5, wherein the steady-state constant load setting is in a step adjustment mode to achieve flexible adjustment of load size in a cost-effective manner.
7. The platform of claim 3, wherein the transient disturbance loads comprise motor impact loads and no-load transformer magnetizing inrush loads, and the capacity configuration is set to 20% of the system test capacity.
8. The 10kV true test load configuration platform according to claim 3, wherein the steady-state interference load is a harmonic load, the harmonic amplitude and frequency are configurable, the capacity is set to be more than 10% of the system test capacity, and the configuration is realized in an electrodeless continuous adjustment mode.
9. The 10kV true test load configuration platform according to claim 1, wherein the energy-saving customized load is in a back-to-back structure energy-feedback electronic load mode and operates in four quadrants; the energy-saving customized load has customized load setting capacity, can be configured with load fluctuation at will and simulates new energy power generation load characteristics; the capacity configuration is not less than 50% of the capacity of the test transformer.
10. The 10kV true test load configuration platform according to claim 7, wherein an equivalent model of a no-load transformer magnetizing inrush current comprises three parts: alternating current power supply, resistance and inductance of coil, transformer model; the alternating current power supply comprises an internal resistor, an internal inductor and an alternating current voltage source; the transformer model comprises resistance of a primary winding, equivalent resistance of iron core loss, induction inductance of an iron core magnetic circuit, an air gap and induction inductance of a coil magnetic circuit;
with RtRepresenting the resistance of the primary winding of the transformer, Liron(t) represents the inductance of the core magnetic circuit, LairRepresenting the air gap and the inductive inductance, R, of the coil magnetic circuitloss(t) equivalent resistance representing core loss, RsIndicating the internal resistance, L, of the AC power supplysRepresenting the internal inductance, R, of an AC power supplylineDenotes the coil resistance, LlineRepresenting coil inductance, V representing AC supply voltage, and V ═ Emsin (ω t + θ), i (t) denotes magnetizing inrush current, iloss(t) equivalent current, i, representing core lossiron(t) represents an induced current of the core magnetic circuit;
the inductive inductance of the core magnetic circuit is determined by
In the formula, N is the number of turns of the coil; a. thecIs the sectional area of the iron core; l' is the length of the iron core; mu is magnetic core magnetic conductivity;
μ is determined by
In the formula, H is magnetic field intensity, and B is magnetic induction intensity induced by the magnetic field intensity;
the H-B curve can be fitted by a tangent function as follows:
H(t)＝f(tan[kB(t)])
the induced current of the core magnetic circuit is determined by:
per kilogram of core loss of
Ploss＝c1tan(c0[B(t)]2)
Wherein c0 and c1 are constants;
iloss(t) and Rloss(t) are respectively determined by the following formula
In the formula cwThe weight of the iron core;
finally, the relation of each parameter of the equivalent model of the transformer magnetizing inrush current is as follows:
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