阅读说明：本技术 一种基于矢量控制的隔离开关自动控制方法 (Automatic isolating switch control method based on vector control ) 是由 刘志远 梁守硕 陆洪建 赵欣洋 李宁 于晓军 杨晨 岑登青 赵健 安燕杰 陈昊阳 于 2019-10-30 设计创作，主要内容包括：本发明提供了一种基于矢量控制的隔离开关自动控制方法，包括获取电机转速和转角位置信号以及电机驱动输出电源的电流采样信号；采用带速度反馈的电机矢量控制算法，产生矢量控制的PWM调制波形；对PWM调制波形进行电气转换，获得电气信号并进行IPM智能功率控制，输出三相PWM电压信号至所述电机。通过动态矢量控制操作机构电机运转的速度和转矩，精确牵引隔离开关动触头运行位置，使其在分合闸时与静触头近距离位置处加速运动，快速越过易产生电弧区域，从而达到避免隔离开关触头分合闸瞬间引起电弧烧伤触头的目的。(The invention provides an automatic control method of an isolating switch based on vector control, which comprises the steps of obtaining a motor rotating speed and corner position signal and a current sampling signal of a motor driving output power supply; generating a vector-controlled PWM (pulse-width modulation) waveform by adopting a motor vector control algorithm with speed feedback; and performing electrical conversion on the PWM waveform to obtain an electrical signal, performing IPM intelligent power control, and outputting a three-phase PWM voltage signal to the motor. The running speed and the running torque of a motor of the operating mechanism are controlled through dynamic vectors, the running position of a moving contact of the isolating switch is accurately pulled, the moving contact and a static contact are accelerated to move at a close distance position when the isolating switch is switched on and off, and an area which is easy to generate an electric arc is quickly crossed, so that the aim of preventing the electric arc from burning a contact when the isolating switch is switched on and off instantly is fulfilled.)

1. An automatic control method of an isolating switch based on vector control is used for realizing the control of a motor in an electric operating mechanism of the isolating switch, and is characterized by comprising the following steps:

acquiring a motor rotating speed and corner position signal and a current sampling signal of a motor drive output power supply;

generating a vector-controlled PWM (pulse-width modulation) waveform by adopting a motor vector control algorithm with speed feedback;

and thirdly, performing electrical conversion on the PWM waveform to obtain an electrical signal, performing IPM intelligent power control, and outputting a three-phase PWM voltage signal to the motor.

2. The method as claimed in claim 1, wherein in the first step, after obtaining a current sampling signal of the motor-driven output power, CLARKE transformation and PARK transformation are sequentially performed along with the current sampling signal, and then table look-up control is performed by a torque and flux linkage controller to output a direct-axis component and an orthogonal quadrature-axis component meeting the target rotation speed requirement.

3. The method for automatically controlling the isolating switch based on the vector control as claimed in claim 1, wherein the second step specifically comprises:

carrying out PID control calculation on the motor rotating speed and corner position signals and a current sampling signal of a motor drive output power supply;

and sequentially carrying out PARK inverse transformation and SVPWM voltage vector modulation on the control quantity after PID calculation to obtain a vector-controlled PWM modulation waveform.

4. The automatic control method of the isolating switch based on the vector control as claimed in claim 3, wherein the SVPWM voltage vector modulation process comprises establishing a vector control model:

dividing the rotation period of the motor rotor into six sectors according to space vectors, and establishing an αβ axis coordinate system;

and modulating the voltage vector of each sector by combining a vector control algorithm.

5. The automatic control method of the isolating switch based on the vector control as claimed in claim 3, wherein in the closing process of the isolating switch, the SVPWM voltage vector modulation control motor state change is: acceleration, uniform speed, acceleration, deceleration, torque lifting and braking; in the process of separating the brake of the isolating switch, the SVPWM voltage vector modulation controls the state change of the motor to be: raising moment and accelerating, reducing moment but accelerating, decelerating, uniform speed and braking.

Technical Field

The invention relates to the technical field of isolating switches, in particular to an isolating switch automatic control method based on vector control.

Background

In a transformer substation, an isolating switch generally refers to a high-voltage isolating switch, namely an isolating switch with rated voltage of 1kV or more, is one of the most used electrical appliances in the high-voltage switch, and has the advantages of simple structure and working principle, but the use amount is large, the requirement on working reliability is high, and the influence on the safe operation of the transformer substation is great. Generally, a group of disconnecting switches are respectively installed in the front and the rear of the circuit breaker in a transformer substation, the circuit breaker is isolated from a power supply, an obvious breaking point is formed, and uncharged parts and other charged parts are disconnected when the circuit breaker needs to be overhauled, so that the safety of work when the circuit breaker needs to be overhauled is ensured. The isolating switch can be used for overhauling and sectionally isolating, and the electrical equipment to be overhauled and the electrified system are isolated from each other by using the reliable insulating capability of the fracture of the isolating switch, so that the isolated equipment can be safely overhauled; changing the operation mode, under the condition that two ends of a fracture are close to equal potential, carrying out on/off in a charged mode, and changing the wiring mode of a bus or other short parallel lines, such as the bus reversing operation of a double-bus circuit; the switching on and switching off of the low-current circuit utilizes the arc pulling capacity and the natural arc quenching capacity of air of an isolating switch fracture when the isolating switch fracture is separated, divides/integrates the capacitance current of a bus, a cable or an overhead line with a fixed length and divides/integrates the excitation current of a no-load transformer with a fixed capacity; the automatic quick isolating switch has the capability of automatically and quickly separating a fracture. The isolating switch can quickly isolate the equipment and the line which have faults under certain conditions, thereby achieving the purpose of saving the using amount of the circuit breaker.

The high-voltage isolating switch is not used for opening-end current, is in a power-off state during opening and closing operations, and does not generate electric arcs through principle analysis. However, through field investigation of a transformer substation, in the switching-on and switching-off processes of some transformer substation disconnecting switches with high voltage grades, large capacitive current is generated, and further capacitive overvoltage is generated, so that electric arcs are generated when the moving contacts and the static contacts are switched on and off to reach a distance of about 1 meter. High temperature generated by electric arc burns the conductive part of the moving contact and the static contact of the isolating switch, the contact resistance is increased, the contact generates heat after long-time operation, the strength of the mechanism is reduced, and finally the contact is burnt. After the contact is burnt out in the operation, the breakpoint part forms discharge to cause serious electrical accidents, other electrical equipment is damaged, the accidents are enlarged, and the personal safety and the equipment safety are seriously influenced.

Therefore, how to provide an automatic control method for a disconnecting switch based on vector control, which can avoid the contact from being burned by electric arcs caused by the switching-on and switching-off of the contacts of the disconnecting switch at the moment, is a problem to be solved urgently by the technical personnel in the field.

Disclosure of Invention

The invention provides an automatic control method of an isolating switch based on vector control, which accurately pulls the running position of a moving contact of the isolating switch through the running speed and the running torque of a motor of an operating mechanism controlled by a dynamic vector, so that the moving contact of the isolating switch can move in an accelerated way at a position close to a fixed contact when the isolating switch is switched on and off, and quickly crosses an area which is easy to generate electric arcs, thereby achieving the purpose of avoiding the electric arcs from burning the contacts when the contacts of the isolating switch are switched on and off instantly. The specific scheme is as follows:

an automatic control method of an isolating switch based on vector control is used for realizing the control of a motor in an electric operating mechanism of the isolating switch, and comprises the following steps:

acquiring a motor rotating speed and corner position signal and a current sampling signal of a motor drive output power supply;

generating a vector-controlled PWM (pulse-width modulation) waveform by adopting a motor vector control algorithm with speed feedback;

and thirdly, performing electrical conversion on the PWM waveform to obtain an electrical signal, performing IPM intelligent power control, and outputting a three-phase PWM voltage signal to the motor.

Preferably, in the first step, after a current sampling signal of the motor drive output power supply is obtained, CLARKE transformation and PARK transformation are sequentially performed along with the current sampling signal, and then table lookup is performed through a torque and flux linkage controller to control and output a direct-axis component and an orthogonal quadrature-axis component which meet the target rotating speed requirement.

Preferably, the second step specifically includes:

carrying out PID control calculation on the motor rotating speed and corner position signals and a current sampling signal of a motor drive output power supply;

and sequentially carrying out PARK inverse transformation and SVPWM voltage vector modulation on the control quantity after PID calculation to obtain a vector-controlled PWM modulation waveform.

Preferably, the SVPWM voltage vector modulation process includes establishing a vector control model:

dividing the rotation period of the motor rotor into six sectors according to space vectors, and establishing an αβ axis coordinate system;

and modulating the voltage vector of each sector by combining a vector control algorithm.

Preferably, in the closing process of the isolating switch, the state change of the SVPWM voltage vector modulation control motor is: acceleration, uniform speed, acceleration, deceleration, torque lifting and braking; in the process of separating the brake of the isolating switch, the SVPWM voltage vector modulation controls the state change of the motor to be: raising moment and accelerating, reducing moment but accelerating, decelerating, uniform speed, braking

Compared with the prior art, the invention has the following beneficial effects:

the invention discloses an automatic control method of an isolating switch based on vector control, which accurately pulls the running position of a moving contact of the isolating switch through the running speed and the running torque of a motor of an operating mechanism controlled by a dynamic vector, so that the moving contact and a static contact can move at an accelerated speed at a close distance when the isolating switch is switched on and switched off, and an easily-generated electric arc area can be quickly crossed, thus effectively avoiding the burning of the contact, further preventing the generation of serious electrical accidents and ensuring the personal safety and equipment safety of operators.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

FIG. 1 is a flow chart of an automatic control method of an isolating switch based on vector control according to the present invention;

FIG. 2 is a schematic diagram of the dual closed loop vector control of the present invention;

FIG. 3 is a schematic diagram of a circuit model of the isolating switch of the present invention;

FIG. 4 is a schematic diagram of the three-dimensional switching value of the isolating switch according to the present invention;

FIG. 5 is a schematic diagram of space vector sector analysis according to the present invention;

FIG. 6 is a block diagram of an automatic control device of an isolating switch based on vector control according to the present invention;

FIG. 7 is a schematic diagram of the coordinate transformation of the present invention;

FIG. 8 is a schematic view of a structure of the isolating switch of the present invention;

fig. 9 is a schematic view of the internal structure of the electric operation box of the isolating switch of the invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the 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.

In order to achieve the above purpose, the method for automatically controlling the isolating switch based on the vector control mainly comprises the following steps:

s1, acquiring a motor rotation speed and corner position signal and a current sampling signal of a motor drive output power supply; after a current sampling signal of a motor drive output power supply is obtained, CLARKE transformation and PARK transformation are sequentially carried out along with the current sampling signal, and then table lookup control is carried out through a torque and flux linkage controller to output a direct-axis component and an orthogonal quadrature-axis component which meet the requirement of a target rotating speed.

Referring to the attached figure 2 of the specification, the torque flux linkage controller is realized by looking up a table and extracting according to a target speed omegaSupply required I_ds、I_qsThereby approaching the target rotation speed. I is_ds、I_qsIs decomposed into a direct-axis component I in phase with the rotor flux linkage by the stator current_dsAnd orthogonal quadrature component I_qs. Direct axis current I_ds: for generating a magnetic field, superimposed on the magnetic field of the rotor, quadrature-axis current I_qs: the control device is used for controlling the torque and has the action equivalent to the armature current of a direct current motor. In application, always set I_dsWhen 0, the maximum torque control is obtained.

And S2, generating a vector-controlled PWM (pulse-width modulation) waveform by adopting a motor vector control algorithm with speed feedback. The specific implementation process is as follows:

carrying out PID control calculation on the motor rotating speed and corner position signals and the current sampling signals of the motor drive output power supply;

and sequentially carrying out PARK inverse transformation and SVPWM voltage vector modulation on the control quantity after PID calculation to obtain a vector-controlled PWM modulation waveform.

The purpose of the voltage vector modulation is to generate a desired space voltage vector, and the projection of the vector U (t) on the three-phase coordinate axes (a, b, c) is a symmetrical three-phase sinusoidal vector. The theoretical basis of SVPWM is the principle of mean value equivalence, i.e. the mean value of a basic voltage vector is made equal to a given voltage vector by combining the basic voltage vectors during a switching cycle.

Referring to the attached figure 3 of the specification, a vector control mathematical model is established from an isolating switch circuit model, wherein a/a ', b/b ', c/c ' cannot be opened simultaneously, and otherwise, the bus is in a through short circuit. The other states are represented by the following table (0/1 for off/on): ubus is the bus supply voltage of the inverter circuit of fig. 3. The phase voltage U can be obtained by the combined control of the switches a/a ', b/b', c/c_AO、B_AO、U_COSum line voltage U_AB、U_BC、U_CAThe values are given in the table below.

TABLE 1 switching value analysis Table in isolation switch circuit model

a	b	c	UAB	UBC	UCA	UAO	UBO	UCO
									0	0	0	0	0	0	0	0	0
1	0	0	UBUS	0	-UBUS	2UBUS/3	-UBUS/3	-UBUS/3
									1	1	0	0	UBUS	-UBUS	UBUS/3	UBUS/3	-2UBUS/3
0	1	0	-UBUS	UBUS	0	-UBUS/3	2UBUS/3	-UBUS/3
									0	1	1	-UBUS	0	UBUS	-2UBUS/3	UBUS/3	UBUS/3
0	0	1	0	-UBUS	UBUS	-UBUS/3	-UBUS/3	2UBUS/3
									1	0	1	UBUS	-UBUS	0	UBUS/3	-2UBUS/3	-UBUS/3
1	1	1	0	0	0	0	0	0

Wherein:

U_AO＝U_mcos(ωt)

U_BO＝U_mcos(ωt-120)

U_CO＝U_mcos(ωt+120)

U(t)＝U_AO+U_BO+U_CO

U_AO、U_BO、U_COthat is, the projection of the vector u (t) on the three-phase coordinate axes (a, b, c), Um is the effective value of the phase voltage, ω is the rotation angular frequency, and ω is 2 pi f.

The SVPWM voltage vector modulation process comprises the steps of establishing a vector control model, dividing the whole period (physically, the rotation period of a motor rotor or the output alternating current period) into six sectors according to space vectors, and establishing an αβ axis coordinate system;

a graphical representation using three-dimensional switching values is shown in fig. 4. Wherein the non-zero vector U₁₀₀、U₁₁₀、U₀₁₀、U₀₁₁、U₀₀₁、U₁₁₀、U₁₀₁The amplitude is the same, and the mode length is 2U_BUS/3, two zero voltage vectors U₀₀₀、U₁₁₁Is 0 and adjacent vectors are spaced 60 degrees apart. The synthesis of the desired voltage vector in these six sectors is analyzed separately:

let the desired voltage vector be U_refWhen in the I-th sector, the sector,

U_ref*T_s＝U₄*T₄+U₆*T₆，

T_sis the time that the vector is rotated by the angle theta,

│U₄│＝│U₆│＝2U_BUSand/3, obtaining the compound with the structure,

order to

Then

And the zero voltage vector is allocated with a time T₇＝T₀＝(T_S-T₄-T₆) /2 or T₇＝(T_S-T₄-T₆)

To generate the actual pulse width modulated waveform, the switches need to be combined, the voltage vector synthesis is sequenced in time, and the U in the stationary coordinate system (α) can be fully multiplexed_α,U_βThe first step of space vector modulation is to judge the signal quality from U_αAnd U_βThe determined space voltage vector U_refThe sector in which it is located. Assuming that the resultant voltage vector falls in sector I, the equivalence is known as follows: 0<arctan(U_β/U_α)<60 degrees. By further analysis, reference voltage vector U can be seen_refThe sector is completely composed of U_β,3U_α-U_β,-3U_α-U_βThe three formulas determine, therefore

From the description attached to fig. 5, have

Finishing to obtain

Simplified and obtained

In the same way, U can be obtained_refThe contribution time of each vector in the other sectors. To reduce switching times, vectorsThe control uses a 5-segment equation.

TABLE 2 switch vector control table for each sector

And S3, performing electrical conversion on the PWM waveform to obtain an electrical signal, performing IPM intelligent power control, and outputting a three-phase PWM voltage signal to the motor.

It should be further noted that, the switch abc is controlled to be turned on or off by table 2, so as to obtain a modulated PWM waveform, which is converted into a driving signal suitable for the IPM module through the driving circuit. The IPM is an intelligent inverter integrated circuit and can invert direct current into three-phase alternating current, and the needed three-phase alternating current can be obtained by inputting a driving PWM signal into the IPM module.

The embodiment of the invention also discloses an automatic isolating switch control device based on vector control, which comprises a motor for controlling the moving contact of the isolating switch to rotate, wherein the motor control module uses an Intelligent Power Module (IPM) and adopts a vector control algorithm to realize the accurate control of the asynchronous motor in the electric operating mechanism of the isolating switch. The motor control module comprises a feedback unit, a main control unit, a driving unit and an IPM power unit; the main control unit receives the motor rotating speed and corner displacement signals and the motor running current sampling signals fed back by the feedback unit, and adopts a motor vector control algorithm with speed feedback to process a motor control command to generate a vector-controlled PWM (pulse-width modulation) waveform; the driving unit electrically converts the PWM modulation waveform generated by the main control unit, inputs the PWM modulation waveform into the IPM power unit, and generates three-phase PWM voltage to supply to the motor.

The feedback unit includes:

the alternating current motor encoder is arranged on the motor and used for acquiring the rotating speed and the corner position signals of the motor;

the Hall sensor is arranged on a motor drive output power supply loop and used for acquiring a current sampling signal;

the input end of the CLARKE transformation subunit is connected with the Hall sensor, the output end of the CLARKE transformation subunit is connected with the PARK transformation subunit, and the PARK transformation subunit is connected with the main control unit.

The coordinate transformation theory can reduce the complexity of the calculation of the motor equation, see FIG. 7 in the specification, and assume f_ax,f_bx,f_cxIs a three-phase instantaneous variable and is positioned on a, b and c coordinates with 120 degrees phase shift, f_qx,f_dx,f_0xFor which the transformation variables are located on orthogonal coordinates d, q.

The transformation equation is as follows,

wherein the content of the first and second substances,

clarke transformation: ω is 0, θ (0) is 0 → θ is 0; application to stator currents: i.e. i_as，i_bs，i_cs，

i_α＝i_as

i_β＝-(i_as+2i_bs)/√3

Park transformation, omega ═ omega_r，θ(0)＝θ_r(0)→θ＝θ_r(ii) a Application to stator currents: i.e. i_α，i_β

i_qs＝i_αcosθ_r-i_βsinθ_r

i_ds＝i_αsinθr-i_βcosθ_r

Inverse Park transform, omega ═ omega_r，θ(0)＝θ_r(0)→θ＝-θ_r(ii) a Applied to stator voltage, V_qs，V_ds

V_α＝V_qscosθ_r+V_dssinθ_r

V_β＝-V_qssinθ_r+V_dscosθ_r。

The main control unit includes:

the torque and flux linkage controller is connected with the alternating current motor encoder and the PARK conversion subunit and is used for receiving the motor rotating speed and corner position signals;

the PID controller is used for receiving a motor running speed signal and a corner position signal fed back by the AC motor encoder and a motor running current sampling signal after coordinate transformation;

the coordinate inverse transformation unit and the PARK inverse transformation subunit are connected with the PID controller;

the SVPWM unit is connected with the PARK inverse transformation subunit and used for carrying out SVPWM voltage vector modulation to obtain a vector-controlled PWM modulation waveform;

the processing flow of the double closed-loop algorithm shown in the attached figure 2 exists in the main control unit in a hardware form.

In order to further optimize the technical scheme, the system also comprises an information interaction unit which comprises a control switch, a state signal lamp and a liquid crystal display screen;

the control switch controls the motor in the operating mechanism to rotate forwards and backwards so as to control the switching-on and switching-off of the disconnecting switch;

the state signal lamp displays the working running state of each phase of disconnecting link of the isolating switch and opens the logical relation of the incoming signal and the outgoing signal.

In order to further optimize the technical scheme, the information interaction unit further comprises an input/output logic module which is used for receiving hard contact information such as switching-on/off conditions and locking signals and outputting actions of the operation of the isolating switch and alarm hard contact signals.

The implementation process of this embodiment is as follows:

referring to the attached fig. 8 of the specification, taking a scissor-type disconnecting switch as an example for analysis, the switching-off process is the reverse process of the switching-on, and the working process is reverse. Therefore, taking the analysis of the closing action process as an example: an electric mechanism operation box 9 drives an operation rod to rotate, the operation rod drives an operation insulator 7 to rotate through a connecting rod 8, the operation insulator 7 drives a crank arm with the top fixed with the operation insulator to rotate, the crank arm pushes a left rotating shaft 5 and a right rotating shaft 5 to rotate through a connecting rod with an elastic device in the middle, and the left rotating shaft 5 and the right rotating shaft 5 realize synchronous rotation of two shafts through reverse connecting rods; when the closing is started, the balance spring 4 is in a stretching state, under the action of operating force and the pulling force of the balance spring 4, the left rotating shaft 5 and the right rotating shaft 5 synchronously rotate to enable the conductive tube to be folded towards the middle, then the movable joint and the upper conductive tube 3 are passed through, the movable contact 1 and the fixed contact 2 are contacted to complete the closing, and when the closing is finished, the upper rotating arm of the operating insulator 7 is limited by the stop block 6. When closing action is close to the end, a connecting lever at the top of the insulator 7 is operated to cross a dead point position (when the connecting lever and a connecting rod containing an elastic device form a straight line), the connecting lever is pushed by the elastic device to be in close contact with the limit stop 6, and at the moment, the elastic device is in a compression state, so that the conductive knife switch bears the pushing force, is reliably kept at a closing position and forms self-locking.

The automatic isolating switch control device based on vector control is arranged in an electric mechanism operating box of the isolating switch, the automatic isolating switch control device based on vector control controls a motor to rotate, an output shaft of the electric mechanism drives a disconnecting link of the isolating switch to transmit, and the structure in the electric mechanism operating box is shown in figure 9.

The operation process of the disconnecting switch of the isolating switch is analyzed and divided into five stages of starting acceleration, uniform speed, abrupt acceleration, torque lifting and braking. Before the system is put into operation, a plurality of tests are carried out to ensure that the moving contact can be in close contact with the fixed contact after the isolating switch is switched on. A debugging worker conducts multiple experiments during system installation and debugging to obtain moving contact running tracks and motor rotation angle, speed and torque data of the operating mechanism in the running process. In the starting acceleration stage, the moving contact is changed from static state to dynamic state, the starting torque of the motor 12 is larger, and the speed is slower; after the disconnecting link is started, recording the angular displacement P1 of the rotation of the motor 12 when the motor 12 changes from acceleration to a turning point in a constant speed state, and when the motor 12 enters a constant speed operation stage, the torque is smaller and the speed is higher; when the moving contact is about 1 meter away from the static contact, recording the angular displacement P2 of the rotation of the motor 12 at the inflection point of the state, rapidly increasing the rotation speed of the motor 12, accelerating the operation of the disconnecting link, and displaying a speed increasing state when the motor operates at the stage; when the top crank arm of the insulator is operated to cross the 'dead point' position, the rotating angular displacement P3 of the motor 12 is recorded, the motor speed is reduced from the position, the torque is increased, the moving contact head can overcome the resistance on the static contact head, the static contact head is quickly inserted, the closing is completed, and the motor 12 at this stage operates and presents a transient speed reduction and torque increase state; when closing action is close to the end, the top crank arm of the insulator is operated to cross the 'dead point' position, and is pushed by the elastic force of the elastic device to be in close contact with the limit stop, the rotating angular displacement P4 of the motor when the crank arm crosses the 'dead point' position is recorded, and the motor 12 is rapidly braked, so that the brake nozzle is prevented from being cracked due to collision of a contact. And (3) stopping the operation of the motor 12 until the movable contact is tightly contacted with the fixed contact, and recording the angular displacement P5 of the rotation of the motor 12 at the moment. Therefore, the operation corner displacement of the closing process operation mechanism motor 12 is 0 → P1 → P2 → P3 → P4 → P5, and the state change is: acceleration → uniform speed → acceleration → deceleration and lifting moment → braking → closing and stopping. The invention introduces a closing limit switch 14 which is arranged in an electric mechanism operation box, when a moving contact contacts with a static contact in the travel of a moving contact, a closing completion signal is sent to a system, at the moment, the motor operates to reach an angular displacement P5, the introduced travel switch is used for verifying the displacement of the motor operating according to an algorithm and the actual operation displacement, and the moving contact is ensured to be closely contacted with the static contact after closing is completed. When the position of the P5 is inconsistent with the position of the travel switch, the system sends out a warning signal, and operation and maintenance personnel need to verify the angular displacement and the position of the travel switch again.

After closing, the motor should stop running, if the motor is blocked due to the fact that the position of the closing limit switch 14 is wrong or in the advancing process, the motor continuously runs and is easy to start, a static contact is in conflict cracking, and an insulator crank arm is deformed, therefore, the motor control module is added with intelligent motor protection, when a moving contact arrives at the closing position, the motor runs to form blocking due to the fact that the stop block cannot continue to advance, the running current is obviously increased, therefore, the motor control module judges the motor blocking tripping protection to stop the motor 12, and the moving contact is prevented from excessively advancing.

The operation process of the disconnecting switch is opposite to the closing process, the motor 12 rotates reversely, after analysis, the disconnecting switch pulls open the contact to overcome the resistance of the spring device, the contact resistance of the moving contact and the static contact is large, the starting torque of the motor 12 is large, after the moving contact crosses the 'dead point' displacement P4, the rotation of the disconnecting switch is accelerated, the moving contact moves to fast cross the arc pulling area, then the speed of the moving contact is reduced, the constant-speed operation is carried out, the disconnecting switch rotates at 0 degree until the disconnecting switch returns to the initial position, the motor 12 brakes fast, and the. Therefore, the operation corner displacement of the operating mechanism motor in the brake separating process is P5 → P4 → P3 → P2 → P1 → 0, and the state change process is as follows: lifting torque and speed → reducing torque but accelerating → decelerating and then at a constant speed → braking → breaking brake. When the system marks that the brake opening is finished, the angular displacement is 0, the motor stops reversing after reaching the 0 position, and the brake opening is finished.

In the switching-on and switching-off process, an information interaction unit of an automatic control device of the isolating switch operating mechanism contacts an operating command, the motor control module judges whether the switching-on and switching-off condition input by the switching-on and switching-off logic module is allowable or not, and when the condition is allowable, the switching-on and switching-off process logic is analyzed according to the above, and the voltage and current output of the motor 12 of the driving operating mechanism is automatically adjusted according to the rotating speed and the angular displacement fed back by the feedback unit in the motor control module, so that the operation speed and the torque of a moving contact of the isolating switch are. Meanwhile, the device introduces a motor protection technology to protect various motors of the operating mechanism motor 12, so that the safety operation of the isolating switch is guaranteed, and when a fault occurs, the device sends an alarm signal to a remote control room through the information interaction unit.

The method for automatically controlling the isolating switch based on the vector control provided by the invention is described in detail, a specific example is applied in the text to explain the principle and the implementation mode of the invention, and the description of the embodiment is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.

In this document, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.