CN111190358A - 10kV closing angle control system and accurate control method - Google Patents
10kV closing angle control system and accurate control method Download PDFInfo
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- CN111190358A CN111190358A CN202010120401.6A CN202010120401A CN111190358A CN 111190358 A CN111190358 A CN 111190358A CN 202010120401 A CN202010120401 A CN 202010120401A CN 111190358 A CN111190358 A CN 111190358A
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B17/00—Systems involving the use of models or simulators of said systems
- G05B17/02—Systems involving the use of models or simulators of said systems electric
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- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
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Abstract
The invention belongs to the technical field of ground fault simulation of a power distribution network, and particularly relates to a 10kV closing angle control system and an accurate control method in the process of ground fault simulation of the power distribution network, which comprises a signal acquisition and processing unit directly connected with a 10kV line, wherein the signal acquisition and processing unit is connected with a high-performance closing angle controller to transmit the closing angle control signal information of the 10kV line, the closing angle controller is connected with an upper computer through a communication network, the upper computer is connected with a simulation test management system, meanwhile, an output pin of the closing angle controller is connected with a permanent magnet switch to issue a closing command, an output pin of the permanent magnet switch is connected with the closing angle controller, the method can accurately control the ground angle during ground fault simulation, so that the ground fault can be simulated and tested in a targeted manner, the test randomness is avoided, and relatively fair and fair test conditions are provided for the tested articles.
Description
Technical Field
The invention belongs to the technical field of power distribution network ground fault simulation, and particularly relates to a 10kV closing angle control system and an accurate control method in a power distribution network ground fault simulation process.
Background
In an electric power system, the neutral point grounding mode of a power distribution network has an extremely important influence on the safety, reliability and economy of the power distribution network to a certain extent, wherein the influence on the insulation level of equipment in the power distribution network, the reliability of a relay protection device in the power distribution network, the performance of a communication system related to the power distribution network and the personal safety of operators of the power distribution network is particularly large.
The 10kV distribution network line is directly contacted with a user, and the operation reliability is particularly important. At present, various single-phase earth fault line selection devices, fault indication positioning devices, fault isolation devices and other power distribution network line fault diagnosis equipment are developed by various scientific research units and are widely applied to power distribution networks. However, it is a problem for device developers and users to effectively and effectively check the functions and reliability of the devices before the devices are shipped. At present, factory inspection of power distribution network line fault diagnosis equipment is usually performed on a small-sized and low-voltage model device, namely, an operation condition or a fault state in a real power distribution network is simulated through mutual cooperation of a small-sized low-voltage transformer, a relay and electronic components, but due to the limitation of withstand voltage (< 400V) and through-current capacity (< 1A), the low-voltage simulation device is difficult to truly simulate the actual equipment condition of a 10kV power distribution network and the operation condition of lines (the rated operation voltage of the 10kV power distribution network is 12kV, and the current is generally greater than 30A), and effective inspection and test of the function and reliability of the power distribution network line fault diagnosis equipment are difficult to realize.
Patent document CN 203798929U discloses a simulation test platform for single-phase earth fault of power distribution network. The power distribution network single-phase earth fault simulation test platform comprises a simulation zero sequence network module and a simulation zero sequence power control module; the simulation zero sequence power supply control module comprises an adjustable transformer, an adjustable inductor, an adjustable resistor, a control switch and a multi-way switch which are sequentially connected in series. This distribution network single-phase earth fault simulation test platform can realize the line selection functional test under fault regulation such as different fault types, different ground connection time intervals, different circuits, can simulate the multichannel zero sequence current change process of actual undercurrent grounding system electric wire netting single-phase fault, and equipment cost is lower, convenient operation, labour saving and time saving, and efficiency of software testing is higher. This distribution network ground fault simulation platform comprises ordinary sky division or ac contactor, by artifical random control closing circuit breaker during the experiment, and the action time discreteness of sky division or ac contactor is very big, consequently can not carry out accurate control to trouble closing angle.
Patent document No. CN 106772184 a discloses a ground fault simulation device and a control method, which relate to the field of power technology, and can simulate a wiring device to generate an instantaneous single-phase ground fault and a permanent single-phase ground fault so as to detect a line selection device in a power distribution network on the premise of not affecting the normal operation of the power distribution network. The method comprises the following steps: the device comprises a ball gap, an isolation disconnecting link and a quick switch, wherein a ground fault simulation device is configured to be a first ground fault simulation mode and a second ground fault simulation mode, and when the time for conducting the head end of the isolation disconnecting link and the tail end of the isolation disconnecting link is longer than the input time interval, the head end of the isolation disconnecting link and the tail end of the isolation disconnecting link are disconnected. The invention is used for simulating the ground fault, the fault transient characteristic is closely related to the voltage phase angle when the ground is connected, and the accurate control of the ground angle when the ground fault is simulated can not be realized, thereby resulting in the test randomness.
Disclosure of Invention
The invention aims to provide a 10kV closing angle control system and an accurate control method aiming at the problems in the prior art, and the method can accurately control the grounding angle during grounding fault simulation, thereby realizing the simulation test of the grounding fault in a targeted manner, avoiding the test randomness and providing relatively fair and fair test conditions for a tested product.
The technical scheme of the invention is as follows:
a10 kV closing angle control system comprises: the device comprises a signal acquisition and processing unit directly connected with a 10kV line, wherein the signal acquisition and processing unit is connected with a high-performance closing angle controller to transmit closing angle control signal information of the 10kV line, the closing angle controller is connected with an upper computer through a communication network, the upper computer is connected with a simulation test management system, an output pin of the closing angle controller is connected with a permanent magnet switch to issue a closing command, and the output pin of the permanent magnet switch is connected with the closing angle controller.
Specifically, the signal acquisition and processing unit comprises a resistance voltage division sensor connected with a 10kV line, the resistance voltage division sensor is connected with the signal conditioning unit for signal conditioning, the signal conditioning unit is connected with an analog-to-digital converter, and the analog-to-digital converter is connected with the high-performance closing angle controller.
Specifically, an output pin of the switching-on angle controller and the permanent magnet switch are sequentially connected through an output driver, a high-speed optocoupler and a permanent magnet switch controller, so that switching-on and required angles of the permanent magnet switch are controlled.
Specifically, the auxiliary contact pretreatment module and the high-speed optocoupler which are connected in sequence are arranged between the output pin of the permanent magnet switch and the closing angle controller, and the auxiliary contact pretreatment module and the high-speed optocoupler are used for the closing angle controller to rapidly collect in an external interruption mode, so that the action time value of a permanent magnet switch loop stored in the closing angle controller is corrected, and the action time error caused by multiple action aging of the permanent magnet switch is compensated.
A control method of the 10kV closing angle control system comprises the following steps:
s1, the simulation test management system sends a closing angle control signal to the closing angle controller through the upper computer;
s2, the closing angle controller receives the collected information of the resistance voltage division sensor and the signal conditioning unit which are connected with the 10kV line, calculates the current angle information of the voltage of the 10kV line, and tracks the voltage phase of the line;
s3, after receiving a closing angle issued by an upper computer through communication, the closing angle controller sends a closing command through an output pin according to an inherent action time value of a permanent magnet switch stored in the closing angle controller before a required closing angle comes by advancing the inherent action time of the permanent magnet switch, controls the closing of the permanent magnet switch and the required angle through an output drive, a high-speed optical coupler and a permanent magnet switch controller, receives the command and performs closing, and one action period is finished;
s4, waiting for the next action period and sending a closing command to the permanent magnet controller in advance of the inherent action time of one permanent magnet switch;
and S5, the permanent magnet controller receives the command and acts to close the switch.
The power distribution network dynamic simulation experiment is a power distribution network which is equivalent to a 10kV power distribution network into 400V or 690V by adopting an equal ratio simulation idea, and the source, the network and the load of the power distribution network are real physical models and are widely applied to many colleges and universities or scientific research institutions in recent years. Compared with digital simulation, the power distribution network dynamic simulation experiment is more real and direct, and can be used for researching the running condition of a power distribution network, verifying the performance of a relay protection device, researching the short-circuit fault characteristics of the power distribution network, researching the fault characteristics of a low-current grounding system of the power distribution network, selecting a low-current grounding fault and the like. Because the distribution network simulation test system of the simulation system adopts a digital modeling simulation method, the situation of real distribution network equipment cannot be completely and accurately simulated, influence factors such as transient characteristics and the like can be ignored, and meanwhile, due to the limitation of simulation step length, the frequency range of the provided transient signal is limited to a certain extent. The real fault running state of the power distribution network cannot be completely simulated, so that the function test and verification of the power distribution terminal have certain limitations, and hidden dangers are buried for the verification of the functions of action strategies, wave recording, communication, disposal decision and the like of the power distribution terminal equipment and the functions of line selection, positioning and the like of low-current ground faults. At present, the traditional power distribution terminals such as primary equipment, station terminals, feeder terminals, line fault positioning indicators and the like are independently tested and verified, the running state and the fault state of actual power distribution equipment cannot be completely simulated, and potential hazards are buried for the operation of a power grid due to the lack of performance check of the equipment and the logic verification of the combined action of primary equipment and secondary equipment under the fault condition; the performance of new technologies and new equipment such as a power distribution terminal, a line selection or positioning device, a fault self-healing device, primary and secondary fusion equipment and the like cannot be accurately verified.
The switching-on angle refers to the phase angle of a certain phase voltage when an inter-phase and grounding short circuit fault occurs in a power system, the fault transient characteristic is closely related to the voltage phase angle when the grounding fault occurs, accurate control of the grounding angle during grounding fault simulation can be realized by adopting a switching-on angle control technology, the time starting point is a positive zero crossing point of a certain phase, the switching-on angle of a first fault point is usually positioned in a range of 0-360, and factors such as optical isolation delay, software delay, switch on-off closing delay and time division delay need to be considered for realizing accurate control of the switching-on angle. When a user sets a closing angle (switch action time), the system deducts various delays from the closing angle, so that a command is sent out in advance, and the action effect of accurate time can be achieved.
The invention has the beneficial effects that: the system comprises: the device comprises a signal acquisition and processing unit directly connected with a 10kV line, wherein the signal acquisition and processing unit is connected with a high-performance closing angle controller to transmit closing angle control signal information of the 10kV line, the closing angle controller is connected with an upper computer through a communication network, the upper computer is connected with a simulation test management system, an output pin of the closing angle controller is connected with a permanent magnet switch to issue a closing command, and the output pin of the permanent magnet switch is connected with the closing angle controller. The method for using the system provided by the invention is that an angle command is sent to the switching-on angle controller through an upper computer of the simulation test management system in the early stage, the phase voltage is tracked by using the switching-on angle controller, the switching-on command is sent to the switching-on controller in advance, the advance is the inherent time of the permanent magnet switch, and the accurate switching-on can be realized under the command.
The stability of the action of the grounding switch is the guarantee of the error of the closing angle, therefore, the invention adopts a rapid high-stability permanent magnet switch, and the precision requirement of the closing angle can be met through experimental verification. The invention uses the high-stability electromagnetic switch, reduces the cost and improves the accuracy, thereby realizing the accurate control of the grounding angle during the grounding fault simulation, avoiding the test randomness and providing relatively fair and fair test conditions for the tested products.
The switching-on angle controller can realize the acquisition and wave recording of the grounding voltage and the current; the switching-on angle controller has the function of tracking the line voltage angle in real time, can realize accurate control of the outlet time according to the inherent action time of the switch and the switching-on angle requirement issued by an upper computer, adopts a high-speed optical coupler at the outlet, has the time error less than or equal to 1uS, has the self-learning function, can real-timely recover the displacement state of the permanent magnet switch of the grounding wire during switching-on operation at each time, tracks the actual switching-on time of the permanent magnet switch, compensates the action time error caused by switch aging, and further improves the accuracy of the switching-on angle.
The method provided by the invention can realize accurate control of the closing angle and ensure the pertinence and consistency of fault simulation; through the artificial intelligence algorithm, the accumulated error caused by aging in the use process of the switch can be compensated, and the precision is further improved.
Drawings
FIG. 1 is a schematic structural view of the present invention;
fig. 2 is a schematic diagram of the wiring principle structure of the present invention.
Detailed Description
The technical solution of the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
Fig. 1 is a schematic diagram of a schematic structure of a 10kV switching-on angle control system provided by the present invention, which includes: the device comprises a signal acquisition and processing unit directly connected with a 10kV line, wherein the signal acquisition and processing unit is connected with a high-performance closing angle controller to transmit closing angle control signal information of the 10kV line, the closing angle controller is connected with an upper computer through a communication network, the upper computer is connected with a simulation test management system, an output pin of the closing angle controller is connected with a permanent magnet switch to issue a closing command, and the output pin of the permanent magnet switch is connected with the closing angle controller.
The signal acquisition and processing unit comprises a resistance voltage division sensor connected with a 10kV line, the resistance voltage division sensor is connected with the signal conditioning unit to condition signals, the signal conditioning unit is connected with the analog-to-digital converter, and the analog-to-digital converter is connected with the high-performance closing angle controller. And an output pin of the switching-on angle controller and the permanent magnet switch are sequentially connected through an output driver, a high-speed optical coupler and a permanent magnet switch controller, so that the switching-on and required angle of the permanent magnet switch is controlled. The permanent magnet switch comprises a permanent magnet switch, and is characterized in that an auxiliary contact pretreatment module and a high-speed optical coupler which are sequentially connected are arranged between an output pin of the permanent magnet switch and a closing angle controller, wherein the auxiliary contact pretreatment module and the high-speed optical coupler are used for the closing angle controller to rapidly collect in an external interruption mode, so that a permanent magnet switch loop action time value stored in the closing angle controller is corrected, and an action time error caused by multiple times of action aging of the permanent magnet switch is compensated.
As shown in fig. 2, which is a schematic diagram of a wiring principle, a three-phase test line collects reference signals of voltages of each phase through a resistance voltage dividing sensor PT and transmits the reference signals to a closing angle controller through a signal conditioning unit, and the three-phase test line is controlled and connected with the closing angle controller through a permanent magnet switch and a permanent magnet switch. The control method of the 10kV closing angle control system provided by the invention comprises the following steps:
s1, the simulation test management system sends a closing angle control signal to the closing angle controller through the upper computer;
s2, the closing angle controller receives the collected information of the resistance voltage division sensor and the signal conditioning unit which are connected with the 10kV line, calculates the current angle information of the voltage of the 10kV line, and tracks the voltage phase of the line;
s3, after receiving a closing angle issued by an upper computer through communication, the closing angle controller sends a closing command through an output pin according to an inherent action time value of a permanent magnet switch stored in the closing angle controller before a required closing angle arrives, the action time is advanced by the inherent action time of the permanent magnet switch, the permanent magnet switch is controlled to be closed and required angles through an output drive, a high-speed optical coupler and a permanent magnet switch controller, the permanent magnet controller receives the command and acts to close, and after one action period is finished, one action period time can be set to be 20 ms;
s4, waiting for the next action period and sending a closing command to the permanent magnet controller in advance of the inherent action time of one permanent magnet switch;
and S5, the permanent magnet controller receives the command and acts to close the switch.
Finally, it should be noted that the above examples are only used to illustrate the technical solutions of the present invention and not to limit the same; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art will understand that: modifications to the specific embodiments of the invention or equivalent substitutions for parts of the technical features may be made; without departing from the spirit of the present invention, it is intended to cover all aspects of the invention as defined by the appended claims.
Claims (5)
1. The utility model provides a 10kV closing angle control system which characterized in that includes: the device comprises a signal acquisition and processing unit directly connected with a 10kV line, wherein the signal acquisition and processing unit is connected with a high-performance closing angle controller to transmit closing angle control signal information of the 10kV line, the closing angle controller is connected with an upper computer through a communication network, the upper computer is connected with a simulation test management system, an output pin of the closing angle controller is connected with a permanent magnet switch to issue a closing command, and the output pin of the permanent magnet switch is connected with the closing angle controller.
2. The 10kV closing angle control system according to claim 1, wherein the signal acquisition and processing unit comprises a resistance voltage division sensor connected with a 10kV line, the resistance voltage division sensor is connected with the signal conditioning unit to condition signals, the signal conditioning unit is connected with an analog-to-digital converter, and the analog-to-digital converter is connected with the high-performance closing angle controller.
3. The 10kV closing angle control system according to claim 1, wherein an output pin of the closing angle controller and the permanent magnet switch are sequentially connected through an output driver, a high-speed optocoupler and a permanent magnet switch controller, so that closing and required angles of the permanent magnet switch are controlled.
4. The 10kV closing angle control system according to claim 3, wherein an auxiliary contact pretreatment module and a high-speed optical coupler which are sequentially connected are arranged between an output pin of the permanent magnet switch and the closing angle controller, and the auxiliary contact pretreatment module and the high-speed optical coupler are used for the closing angle controller to rapidly collect in an external interruption mode, so that a permanent magnet switch loop action time value stored in the closing angle controller is corrected, and an action time error caused by multiple action aging of the permanent magnet switch is compensated.
5. A method for controlling a 10kV switching angle control system according to any of the above claims, characterized by comprising the steps of:
s1, the simulation test management system sends a closing angle control signal to the closing angle controller through the upper computer;
s2, the closing angle controller receives the collected information of the resistance voltage division sensor and the signal conditioning unit which are connected with the 10kV line, calculates the current angle information of the voltage of the 10kV line, and tracks the voltage phase of the line;
s3, after receiving a closing angle issued by an upper computer through communication, the closing angle controller sends a closing command through an output pin according to an inherent action time value of a permanent magnet switch stored in the closing angle controller before a required closing angle comes by advancing the inherent action time of the permanent magnet switch, controls the closing of the permanent magnet switch and the required angle through an output drive, a high-speed optical coupler and a permanent magnet switch controller, receives the command and performs closing, and one action period is finished;
s4, waiting for the next action period and sending a closing command to the permanent magnet controller in advance of the inherent action time of one permanent magnet switch;
and S5, the permanent magnet controller receives the command and acts to close the switch.
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