Protection method and system for energy extraction type high-voltage shunt reactor

Abstract

The invention discloses a protection method and system for an energy extraction type high-voltage shunt reactor. The method comprises the following steps: constructing an energy extraction high-resistance circuit model of the energy extraction type high-voltage shunt reactor to be protected; obtaining a main reactance side current and an energy extraction side current according to the energy extraction high reactance circuit model; and performing protection starting judgment on the energy extraction type high-voltage shunt reactor according to the main reactance side current and the energy extraction side current so as to improve the application range and efficiency of protection judgment.

Description

Technical Field

[0001] The present invention relates to the technical field of relay protection for electric power systems, and in particular to a protection method and system for an energy extraction type high voltage shunt reactor. Background Art

[0002] Since there is no transformer in the switch station, only high-voltage shunt reactors, busbars, circuit breakers and other equipment, adding an energy extraction coil to the high-voltage shunt reactor as a station power supply has become a widespread engineering application. Among them, the energy extraction type high-voltage shunt reactor (abbreviated as energy extraction high-voltage shunt reactor) formed by adding an energy extraction coil to the high-voltage shunt reactor is compared with the ordinary high-voltage shunt reactor. The energy extraction high-voltage shunt reactor is formed by adding a secondary coil and arranging it with the main winding in an appropriate structure to form a setting similar to a transformer, and then extracting energy from the main winding of the reactor through the principle of electromagnetic induction to provide power for the station power system.

[0003] In the prior art, in order to ensure the normal operation of the power system, the energy extraction high-voltage reactor needs to be protected, and the existing energy extraction high-voltage reactor protection mainly includes the energy extraction side inter-turn protection and the energy extraction side cell differential protection. The backup protection includes the energy extraction side winding overcurrent protection and the energy extraction side switch overcurrent protection. Among them, the energy extraction side inter-turn protection utilizes the mechanism that zero-sequence current will be generated between turns of the energy extraction side winding, and the energy extraction side winding zero-sequence current is used as the action criterion. In order to avoid the misoperation of the energy extraction side inter-turn protection caused by asymmetric faults outside the reactor area or on the main reactor side of the reactor, the head end zero-sequence voltage or zero-sequence current is used as the locking criterion. The above-mentioned protection judgment basis is only applicable to phase-split high-voltage reactors and the energy extraction winding is a delta-connected one. When a three-phase integrated high-voltage reactor is used or the energy extraction winding is a star-connected one, the protection judgment basis cannot be used, which limits the protection range. Summary of the invention

[0004] In order to solve the above technical problems, the present invention discloses a protection method and system for an energy extraction type high voltage shunt reactor, which are used to improve the protection application scope.

[0005] In order to achieve the above-mentioned object, in a first aspect, the present invention discloses a protection method for an energy extraction type high voltage shunt reactor, comprising:

[0006] Construct an energy-extracting high-voltage shunt reactor circuit model for the energy-extracting high-voltage shunt reactor to be protected;

[0007] Obtaining the main reactor side current and the energy extraction side current according to the energy extraction high-voltage reactor circuit model;

[0008] The protection start-up of the energy-extracting high-voltage shunt reactor is judged according to the current on the main reactor side and the current on the energy-extracting side.

[0009] The present invention discloses a protection method for an energy-drawing high-voltage shunt reactor. First, an energy-drawing high-voltage shunt reactor circuit model of the energy-drawing high-voltage shunt reactor to be protected is constructed to obtain the current flow direction in the energy-drawing high-voltage shunt reactor according to the circuit model, so that the protection judgment of the energy-drawing high-voltage shunt reactor can be made according to the current flow direction. Therefore, the protection judgment can be made regardless of the type of the energy-drawing high-voltage shunt reactor, thereby improving the applicable scope of the protection. Furthermore, in order to ensure the accuracy of the protection judgment, the main reactor side current and the energy-drawing side current of the energy-drawing high-voltage shunt reactor on the main reactor side and the energy-drawing side current on the energy-drawing side are obtained according to the energy-drawing high-voltage shunt reactor circuit model, so that the protection start judgment of the energy-drawing high-voltage shunt reactor is made according to the main reactor side current and the energy-drawing side current, so that the method disclosed in the present invention is not limited by the energy-drawing high-voltage shunt reactor structure and wiring form, and can act quickly for faults on both the high-voltage side and the low-voltage side of the energy-drawing high-voltage shunt reactor.

[0010] As a preferred example, the step of constructing an energy-drawing high-voltage shunt reactor circuit model for the energy-drawing high-voltage shunt reactor to be protected includes:

[0011] Acquiring structural information of the energy extraction type high-voltage shunt reactor;

[0012] According to the structural information and the preset transformer circuit model, an energy extraction high-voltage reactor circuit model with the magnetizing reactance as the main reactance is constructed.

[0013] The present invention is based on the fact that the energy-extracting high-voltage shunt reactor is equivalent to a transformer with the excitation reactance as the main reactance, and thus utilizes the transformer model and the structural information corresponding to the energy-extracting high-voltage shunt reactor to construct a corresponding energy-extracting high-resistance circuit model to simplify the energy-extracting high-resistance circuit model, thereby improving the efficiency of protection judgment.

[0014] As a preferred example, the expression of the energy extraction high impedance circuit model is:

[0015] I1=I L +I3

[0016] I L =U1 / jX L

[0017] I3=-I2 / n

[0018] Wherein, n is the ratio of the phase voltage between the main reactor side and the energy extraction side of the energy extraction type high-voltage shunt reactor; U1 is the phase voltage on the main reactor side; I1 is the head-end current on the main reactor side; I2 is the switch current on the energy extraction side; I3 is the current equivalent to I2 on the main reactor side; Z is the load carried by the energy extraction winding; X L is the inductive reactance value of the main reactance; and j is the imaginary part of the complex number.

[0019] The present invention constructs the energy-extracting high-resistance circuit model by adopting the type of transformer model, so as to simplify the process of protection judgment basis according to the energy-extracting high-resistance circuit model, thereby improving the efficiency of protection judgment. At the same time, the current flow direction of the energy-extracting high-resistance circuit model is used to construct the energy-extracting high-resistance circuit model, so that when performing protection judgment analysis according to the energy-extracting high-resistance circuit model, protection judgment can be performed without being limited by the structure and wiring of the energy-extracting high-resistance, thereby improving the scope of protection.

[0020] As a preferred example, the protection start judgment of the energy extraction type high-voltage shunt reactor according to the main reactor side current and the energy extraction side current includes:

[0021] According to the current on the main reactor side and the current on the energy extraction side, it is determined whether to protect the energy extraction type high-voltage shunt reactor by using a preset protection start judgment basis; wherein the protection start judgment basis is:

[0022]

[0023] Among them, the I set It is the preset setting of high-energy-drawing longitudinal differential protection.

[0024] Based on the circuit model, the present invention knows that, in an ideal state, the currents on the main reactor side and the energy extraction side should be consistent during normal operation. However, in reality, there is a slight imbalance in the currents on both sides due to factors such as setting errors. Therefore, the present invention sets I set Avoid unbalanced current and improve the accuracy of protection judgment.

[0025] In a second aspect, the present invention discloses a protection system for an energy extraction type high voltage shunt reactor, including a model building module, a parameter acquisition module and a protection determination module;

[0026] The model building module is used to construct an energy-drawing high-voltage shunt reactor circuit model of the energy-drawing high-voltage shunt reactor to be protected;

[0027] The parameter acquisition module is used to obtain the main reactor side current and the energy extraction side current according to the energy extraction high-voltage reactor circuit model;

[0028] The protection determination module is used to determine the protection start of the energy extraction type high-voltage shunt reactor according to the main reactor side current and the energy extraction side current.

[0029] The present invention discloses a protection system for an energy-drawing high-voltage shunt reactor. First, an energy-drawing high-voltage shunt reactor circuit model of the energy-drawing high-voltage shunt reactor to be protected is constructed to obtain the current flow direction in the energy-drawing high-voltage shunt reactor according to the circuit model, so that the protection judgment of the energy-drawing high-voltage shunt reactor can be made according to the current flow direction. Therefore, the protection judgment can be made regardless of the type of the energy-drawing high-voltage shunt reactor, thereby improving the applicable scope of the protection. Furthermore, in order to ensure the accuracy of the protection judgment, the main reactor side current and the energy-drawing side current of the energy-drawing high-voltage shunt reactor on the main reactor side and the energy-drawing side current on the energy-drawing side are obtained according to the energy-drawing high-voltage shunt reactor circuit model, so that the protection start judgment of the energy-drawing high-voltage shunt reactor is made according to the main reactor side current and the energy-drawing side current, so that the method disclosed in the present invention is not limited by the energy-drawing high-voltage shunt reactor structure and wiring form, and can act quickly for faults on both the high-voltage side and the low-voltage side of the energy-drawing high-voltage shunt reactor.

[0030] As a preferred example, the model building module includes a structural unit and a building unit;

[0031] The structural unit is used to obtain structural information of the energy extraction type high-voltage shunt reactor;

[0032] The construction unit is used to construct an energy extraction high-voltage reactor circuit model with the magnetizing reactance as the main reactance according to the structural information and a preset transformer circuit model.

[0033] The present invention is based on the fact that the energy-extracting high-voltage shunt reactor is equivalent to a transformer with the excitation reactance as the main reactance, and thus utilizes the transformer model and the structural information corresponding to the energy-extracting high-voltage shunt reactor to construct a corresponding energy-extracting high-resistance circuit model to simplify the energy-extracting high-resistance circuit model, thereby improving the efficiency of protection judgment.

[0034] As a preferred example, the expression of the energy extraction high impedance circuit model is:

[0035] I1=I L +I3

[0036] I L =U1 / jX L

[0037] I3=-I2 / n

[0038] Wherein, n is the ratio of the phase voltage between the main reactor side and the energy extraction side of the energy extraction type high-voltage shunt reactor; U1 is the phase voltage on the main reactor side; I1 is the head-end current on the main reactor side; I2 is the switch current on the energy extraction side; I3 is the current equivalent to I2 on the main reactor side; Z is the load carried by the energy extraction winding; X L is the inductive reactance value of the main reactance; and j is the imaginary part of the complex number.

[0039] The present invention constructs the energy-extracting high-resistance circuit model by adopting the type of transformer model, so as to simplify the process of protection judgment basis according to the energy-extracting high-resistance circuit model, thereby improving the efficiency of protection judgment. At the same time, the current flow direction of the energy-extracting high-resistance circuit model is used to construct the energy-extracting high-resistance circuit model, so that when performing protection judgment analysis according to the energy-extracting high-resistance circuit model, protection judgment can be performed without being limited by the structure and wiring of the energy-extracting high-resistance, thereby improving the scope of protection.

[0040] As a preferred example, the protection determination module includes:

[0041] According to the current on the main reactor side and the current on the energy extraction side, it is determined whether to protect the energy extraction type high-voltage shunt reactor by using a preset protection start judgment basis; wherein the protection start judgment basis is:

[0042]

[0043] Among them, the I set It is the preset setting of high-energy-drawing longitudinal differential protection.

[0044] Based on the circuit model, the present invention knows that, in an ideal state, the currents on the main reactor side and the energy extraction side should be consistent during normal operation. However, in reality, there is a slight imbalance in the currents on both sides due to factors such as setting errors. Therefore, the present invention sets I set Avoid unbalanced current and improve the accuracy of protection judgment.

[0045] In a third aspect, the present invention discloses a computer device, including a memory and a processor, wherein the memory stores a computer program, and when the processor executes the computer program, the protection method of a power extraction type high-voltage shunt reactor as described in the first aspect is implemented.

[0046] In a fourth aspect, the present invention discloses a computer-readable storage medium having a computer program stored thereon, wherein when the computer program is executed by a processor, the protection method for an energy extraction type high-voltage shunt reactor as described in the first aspect is implemented. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 : A schematic flow chart of a protection method for an energy extraction type high voltage shunt reactor disclosed in an embodiment of the present invention;

[0048] Figure 2 : A schematic structural diagram of a protection system for an energy extraction type high voltage shunt reactor disclosed in an embodiment of the present invention;

[0049] Figure 3 : A schematic diagram of a protection configuration structure of an energy extraction type high voltage shunt reactor disclosed in an embodiment of the present invention;

[0050] Figure 4 : Schematic diagram of an energy-extracting high-voltage shunt reactor circuit model disclosed in an embodiment of the present invention. DETAILED DESCRIPTION

[0051] 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.

[0052] Example

[0053] In the prior art, compared with ordinary high-voltage protection, the energy extraction high-voltage protection adds energy extraction side related protection because it adds an energy extraction winding used as a power supply. Among them, the energy extraction side related protection mainly includes energy extraction side turn-to-turn protection and energy extraction side cell differential protection. The backup protection includes energy extraction side winding overcurrent protection and energy extraction side switch overcurrent protection.

[0054] Taking one of the above protections, such as the energy extraction side turn-to-turn protection, as an example, the prior art uses the mechanism that zero-sequence current will be generated between turns of the energy extraction side winding, and uses the zero-sequence current of the energy extraction side winding as the action criterion. In order to avoid the misoperation of the energy extraction side turn-to-turn protection caused by an asymmetric fault outside the reactor area or on the main reactor side of the reactor, the head-end zero-sequence voltage or zero-sequence current is used as the blocking criterion. If the zero-sequence overcurrent element is protected, the current is taken from the energy extraction side winding CT, and the action criterion is: (I a+I b+I c)>I 0.set; where I a, I b, I c are three-phase currents, and I 0.set is the zero-sequence overcurrent setting; and for the protection of the zero-sequence voltage blocking element, the voltage is taken from the main reactor side PT, and the action criterion is: (Ua+Ub+Uc)>U0.set, where: Ua, Ub, Uc are phase voltages, and U0.set is the grid-side zero-sequence voltage blocking setting. When protecting the zero-sequence current blocking element, the current is taken from the main reactance head-end CT, and the action criterion is: (I a+I b+I c)>I 0.set, where: I a, I b, I c are the head-end currents, and I 0.set is the grid-side zero-sequence current blocking value.

[0055] The above protection method is only applicable to split-phase high-voltage reactors and the energy extraction winding is a delta connection. When a three-phase integrated high-voltage reactor is used or the energy extraction winding is a star connection, the energy extraction side turn-to-turn protection needs to be withdrawn, which limits the scope of application of the energy extraction side turn-to-turn protection. In this embodiment, in order to solve the above technical problems, a protection method for an energy extraction type high-voltage shunt reactor is provided. The protection method is not limited by the structure and wiring form of the energy extraction high-voltage reactor, and can quickly act on faults on both the high-voltage side and the low-voltage side of the energy extraction high-voltage reactor.

[0056] Specifically, refer to Figure 1 , is a flow chart of the protection method of the energy extraction type high-voltage shunt reactor, which mainly includes steps 101 to 103, and the steps are mainly:

[0057] Step 101: construct an energy-extracting high-voltage shunt reactor circuit model for the energy-extracting high-voltage shunt reactor to be protected.

[0058] In this embodiment, the step mainly includes: obtaining the structural information of the energy-extracting high-voltage shunt reactor; and constructing an energy-extracting high-voltage shunt reactor circuit model with the magnetizing reactance as the main reactance based on the structural information and the preset transformer circuit model.

[0059] The expression of the energy extraction high impedance circuit model is:

[0060] I1=I L +I3

[0061] I L =U1 / jX L

[0062] I3=-I2 / n

[0063] Wherein, n is the ratio of the phase voltage between the main reactor side and the energy extraction side of the energy extraction type high-voltage shunt reactor; U1 is the phase voltage on the main reactor side; I1 is the head-end current on the main reactor side; I2 is the switch current on the energy extraction side; I3 is the current equivalent to I2 on the main reactor side; Z is the load carried by the energy extraction winding; X L is the inductive reactance value of the main reactance; and j is the imaginary part of the complex number. The inductive reactance value can be provided by the manufacturer of the energy extraction high-voltage reactor equipment, or can be calculated based on the reactor capacity.

[0064] Specifically, in certain implementations of this embodiment, refer to Figure 3 , is a diagram of a high-power protection configuration provided by this embodiment. Figure 3 As shown in the structure of the energy extraction high-voltage reactor, each type of energy extraction high-voltage reactor is equivalent to a transformer with excitation reactance as the main reactance. Therefore, the energy extraction high-voltage reactor circuit model is obtained by referring to the transformer circuit model. Specifically, the structure diagram of the energy extraction high-voltage reactor circuit model can be referred to Figure 4 .

[0065] Reference Figure 3 and Figure 4 , the magnetizing reactance L is equal to the reactance value of the main reactance, T is an ideal transformer with a transformation ratio of n, n is equal to the ratio of the phase voltage (voltage to ground) between the main reactance side and the energy extraction side, and Figure 3 The ratio of the phase voltages on PT1 and PT2, U1 is the phase voltage on the main reactance side, and I1 is the head-end current on the main reactance side, that is, Figure 3 The current at the CT1 terminal is shown in FIG. 1 , and I2 is the switch current at the energy extraction side. Figure 3 The current at the CT4 terminal is shown in FIG. 1 , wherein I3 is the current equivalent to I2 at the main inductor side; and Z is the load carried by the energy extraction winding.

[0066] Therefore, according to the energy extraction high-voltage shunt reactor circuit model, when the energy extraction high-voltage shunt reactor operates normally, the relationship between the currents in the energy extraction high-voltage shunt reactor circuit model is:

[0067] I1=I L +I3

[0068] I L =U1 / jX L

[0069] I3=-I2 / n

[0070] Therefore, under ideal conditions, the relationship between the currents is:

[0071]

[0072] In this embodiment, this step is based on the fact that the energy-extracting high-voltage shunt reactor is equivalent to a transformer with the excitation reactance as the main reactance, and thus the transformer model and the structural information corresponding to the energy-extracting high-voltage shunt reactor are used to construct a corresponding energy-extracting high-resistance circuit model to simplify the energy-extracting high-resistance circuit model, thereby improving the efficiency of protection judgment. At the same time, the energy-extracting high-resistance circuit model is constructed by adopting the type of transformer model, so that the subsequent process of simplifying the basis for protection judgment according to the energy-extracting high-resistance circuit model can be improved to improve the efficiency of protection judgment. At the same time, the energy-extracting high-resistance circuit model is constructed by using the current flow direction of the current in the energy-extracting high-resistance circuit model, so that when the protection judgment analysis is performed according to the energy-extracting high-resistance circuit model, the protection judgment can be performed without being limited by the structure and wiring of the energy-extracting high-resistance, thereby improving the scope of protection.

[0073] Step 102: Obtain the main reactor side current and the energy extraction side current according to the energy extraction high-voltage reactor circuit model.

[0074] In this embodiment, this step mainly includes: based on the constructed energy extraction high-resistance circuit model and the relationship between the currents in the model, the head-end current on the main reactance side, the switching current on the energy extraction side, the phase voltage on the main reactance side and the inductive reactance value of the main reactance are obtained, so as to calculate the current flowing through the main reactance according to the phase voltage on the main reactance side and the inductive reactance value of the main reactance.

[0075] Step 103: Perform protection start judgment on the energy extraction type high-voltage shunt reactor according to the main reactor side current and the energy extraction side current.

[0076] In this embodiment, this step mainly includes: judging whether to protect the energy extraction type high-voltage shunt reactor according to the current on the main reactor side and the current on the energy extraction side by using a preset protection start judgment basis; wherein the protection start judgment basis is:

[0077]

[0078] Among them, the I set It is the preset setting of high-energy-drawing longitudinal differential protection.

[0079] Specifically, in some implementations of this embodiment, the protection judgment basis is set with reference to the relationship between the currents. At the same time, based on the fact that the currents on the energy extraction side and the main reactor side cannot be completely consistent in actual application, the current error threshold is set for protection judgment. Specifically, the action criterion of the energy extraction high-voltage reactor longitudinal differential protection is:

[0080]

[0081] Among them, I set In order to extract high-resistance longitudinal differential protection setting value, it can be adjusted according to the specific project.

[0082] In this embodiment, this step is based on the circuit model. Under ideal conditions, the currents on the main reactor side and the energy extraction side should be consistent during normal operation. However, due to factors such as setting errors, there is a slight imbalance in the currents on both sides. Therefore, this application sets I set Avoid unbalanced current and improve the accuracy of protection judgment.

[0083] On the other hand, this embodiment also discloses a protection system for an energy extraction type high voltage shunt reactor. For the specific structure of the protection system, please refer to Figure 2 , including a model building module 201, a parameter acquisition module 202 and a protection determination module 203.

[0084] The model building module 201 is used to construct an energy-drawing high-voltage shunt reactor circuit model of the energy-drawing high-voltage shunt reactor to be protected.

[0085] The parameter acquisition module 202 is used to obtain the main reactor side current and the power extraction side current according to the power extraction high-voltage reactor circuit model.

[0086] The protection determination module 203 is used to determine the protection start of the energy extraction type high-voltage shunt reactor according to the main reactor side current and the energy extraction side current.

[0087] In this embodiment, the model building module 201 includes a structural unit and a building unit.

[0088] The structural unit is used to obtain structural information of the energy extraction type high-voltage shunt reactor.

[0089] The construction unit is used to construct an energy extraction high-voltage reactor circuit model with the magnetizing reactance as the main reactance according to the structural information and a preset transformer circuit model.

[0090] In this embodiment, the expression of the energy extraction high impedance circuit model is:

[0091] I1=I L +I3

[0092] I L =U1 / jX L

[0093] I3=-I2 / n

[0094] Wherein, n is the ratio of the phase voltage between the main reactor side and the energy extraction side of the energy extraction type high-voltage shunt reactor; U1 is the phase voltage on the main reactor side; I1 is the head-end current on the main reactor side; I2 is the switch current on the energy extraction side; I3 is the current equivalent to I2 on the main reactor side; Z is the load carried by the energy extraction winding; X L is the inductive reactance value of the main reactance; and j is the imaginary part of the complex number.

[0095] In this embodiment, the protection determination module 203 includes:

[0096] According to the current on the main reactor side and the current on the energy extraction side, it is determined whether to protect the energy extraction type high-voltage shunt reactor by using a preset protection start judgment basis; wherein the protection start judgment basis is:

[0097]

[0098] Among them, the I set It is the preset setting of high-energy-drawing longitudinal differential protection.

[0099] Correspondingly, in this embodiment, a computer device is also provided, including a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, and the processor implements the protection method of the energy extraction type high-voltage shunt reactor when executing the computer program. The processor may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components, etc. The general-purpose processor may be a microprocessor or the processor may also be any conventional processor, etc. The processor is the control center of the terminal, and various interfaces and lines are used to connect various parts of the entire terminal. The memory may be used to store the computer program, and the processor implements various functions of the terminal by running or executing the computer program stored in the memory and calling the data stored in the memory. The memory may mainly include a program storage area and a data storage area, wherein the program storage area may store an operating system, an application required for at least one function (such as a sound playback function, an image playback function, etc.), etc.; the data storage area may store data created according to the use of the mobile phone (such as audio data, a phone book, etc.), etc. In addition, the memory may include a high-speed random access memory, and may also include a non-volatile memory, such as a hard disk, a memory, a plug-in hard disk, a smart memory card (Smart Med ia Card, SMC), a secure digital (Secure Digital, SD) card, a flash card (Flash Card), at least one disk storage device, a flash memory device, or other volatile solid-state storage devices.

[0100] Correspondingly, this embodiment also provides a computer-readable storage medium, which includes a stored computer program, wherein when the computer program is running, the device where the computer-readable storage medium is located is controlled to execute the protection method of the energy-extracting high-voltage shunt reactor.

[0101] Wherein, if the module integrated with the fault protection circuit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on such an understanding, all or part of the processes in the above-mentioned embodiment method can also be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a computer-readable storage medium. When the computer program is executed by the processor, the steps of the above-mentioned method embodiments can be implemented. Wherein, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form, etc. The computer-readable medium can include: any entity or device capable of carrying the computer program code, recording medium, U disk, mobile hard disk, disk, optical disk, computer memory, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), electrical carrier signal, telecommunication signal and software distribution medium, etc.

[0102] Compared with the prior art, the embodiments of the present invention have the following beneficial effects:

[0103] The present embodiment discloses a protection method and system for an energy-drawing high-voltage shunt reactor. First, an energy-drawing high-voltage shunt reactor circuit model of the energy-drawing high-voltage shunt reactor to be protected is constructed to obtain the current flow direction in the energy-drawing high-voltage shunt reactor according to the circuit model, so that a protection judgment of the energy-drawing high-voltage shunt reactor can be made subsequently according to the current flow direction. Thus, the protection judgment can be made regardless of the type of the energy-drawing high-voltage shunt reactor, thereby improving the applicable scope of the protection. Furthermore, in order to ensure the accuracy of the protection judgment, the main reactor side current and the energy-drawing side current of the energy-drawing high-voltage shunt reactor on the main reactor side and the energy-drawing side current on the energy-drawing side are obtained according to the energy-drawing high-voltage shunt reactor circuit model, so that the protection start-up judgment of the energy-drawing high-voltage shunt reactor is made according to the main reactor side current and the energy-drawing side current, so that the method disclosed in the present invention is not limited by the energy-drawing high-voltage shunt reactor structure and wiring form, and can act quickly on faults on both the high-voltage side and the low-voltage side of the energy-drawing high-voltage shunt reactor.

[0104] The specific embodiments described above further illustrate the purpose, technical solutions and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. It is particularly pointed out that for those skilled in the art, any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the scope of protection of the present invention.

Claims

1. A protection method for an energy extraction type high voltage shunt reactor, characterized in that: include: Construct an energy-extracting high-voltage shunt reactor circuit model for the energy-extracting high-voltage shunt reactor to be protected; Obtaining the main reactor side current and the energy extraction side current according to the energy extraction high-voltage reactor circuit model; The protection start-up of the energy-extracting high-voltage shunt reactor is judged according to the current on the main reactor side and the current on the energy-extracting side.

2. A method for protecting an energy extraction type high voltage shunt reactor according to claim 1, characterized in that: The method of constructing an energy-extracting high-voltage shunt reactor circuit model for the energy-extracting high-voltage shunt reactor to be protected includes: Acquiring structural information of the energy extraction type high-voltage shunt reactor; According to the structural information and the preset transformer circuit model, an energy extraction high-voltage reactor circuit model with the magnetizing reactance as the main reactance is constructed.

3. A method for protecting an energy extraction type high voltage shunt reactor according to claim 2, characterized in that: The expression of the energy extraction high impedance circuit model is: I1=I L +I3 I L =U1 / jX L I3=-I2 / n Wherein, n is the ratio of the phase voltage between the main reactor side and the energy extraction side of the energy extraction type high-voltage shunt reactor; U1 is the phase voltage on the main reactor side; I1 is the head-end current on the main reactor side; I2 is the switch current on the energy extraction side; I3 is the current equivalent to I2 on the main reactor side; Z is the load carried by the energy extraction winding; X L is the inductive reactance value of the main reactance; and j is the imaginary part of the complex number.

4. A method for protecting an energy extraction type high voltage shunt reactor according to claim 3, characterized in that: The protection start judgment of the energy extraction type high-voltage shunt reactor according to the main reactor side current and the energy extraction side current includes: According to the current on the main reactor side and the current on the energy extraction side, it is determined whether to protect the energy extraction type high-voltage shunt reactor by using a preset protection start judgment basis; wherein the protection start judgment basis is: Among them, the I set It is the preset setting of high-energy-drawing longitudinal differential protection.

5. A protection system for an energy extraction type high voltage shunt reactor, characterized in that: It includes model building module, parameter acquisition module and protection determination module; The model building module is used to construct an energy-drawing high-voltage shunt reactor circuit model of the energy-drawing high-voltage shunt reactor to be protected; The parameter acquisition module is used to obtain the main reactor side current and the energy extraction side current according to the energy extraction high-voltage reactor circuit model; The protection determination module is used to determine the protection start of the energy extraction type high-voltage shunt reactor according to the main reactor side current and the energy extraction side current.

6. A protection system for an energy extraction type high voltage shunt reactor according to claim 5, characterized in that: The model building module includes a structural unit and a building unit; The structural unit is used to obtain structural information of the energy extraction type high-voltage shunt reactor; The construction unit is used to construct an energy extraction high-voltage reactor circuit model with the magnetizing reactance as the main reactance according to the structural information and a preset transformer circuit model.

7. A protection system for an energy extraction type high voltage shunt reactor according to claim 6, characterized in that: The expression of the energy extraction high impedance circuit model is: I1=I L +I3 I L =U1 / jX L I3=-I2 / n Wherein, n is the ratio of the phase voltage between the main reactor side and the energy extraction side of the energy extraction type high-voltage shunt reactor; U1 is the phase voltage on the main reactor side; I1 is the head-end current on the main reactor side; I2 is the switch current on the energy extraction side; I3 is the current equivalent to I2 on the main reactor side; Z is the load carried by the energy extraction winding; X L is the inductive reactance value of the main reactance; and j is the imaginary part of the complex number.

8. A protection system for an energy extraction type high voltage shunt reactor according to claim 7, characterized in that: The protection determination module comprises: According to the current on the main reactor side and the current on the energy extraction side, it is determined whether to protect the energy extraction type high-voltage shunt reactor by using a preset protection start judgment basis; wherein the protection start judgment basis is: Among them, the I set It is the preset setting of high-energy-drawing longitudinal differential protection.

9. A computer device comprising a memory and a processor, wherein the memory stores a computer program, wherein: When the processor executes the computer program, a protection method for an energy extraction type high-voltage shunt reactor according to any one of claims 1 to 4 is implemented.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, a protection method for an energy extraction type high-voltage shunt reactor according to any one of claims 1 to 4 is implemented.

Images