CN114822134A - Power distribution automation system training method and training platform based on raspberry group - Google Patents
Power distribution automation system training method and training platform based on raspberry group Download PDFInfo
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Abstract
The invention provides a raspberry group-based power distribution automation system practical training method and a practical training platform, wherein a typical distribution line micro practical training device is constructed according to a typical distribution line topological structure; then, the GPIO port of the raspberry group is controlled to control the state of each relay and each short circuit module through a control signal line, and the simulation of a power distribution automation system is realized; and finally, automatically realizing the control of the relay in the whole circuit according to the sequence of the opening and closing control commands input by the practical training personnel and giving the scores of the practical training personnel. The invention has small floor area and good economy, and judges the mastery condition score of the practical training personnel on the action logic skills of the power distribution automation system by utilizing the opening and closing control command time sequence of each power distribution automation terminal input by the practical training personnel and the monitored actual running state of the power distribution line.
Description
Technical Field
The invention belongs to the technical field of electric power, and particularly relates to a raspberry pi-based power distribution automation system practical training method and a practical training platform.
Background
The distribution automation terminal is mainly used for voltage and current data acquisition and monitoring, distribution switch state acquisition, opening and closing remote control and the like during normal operation of a distribution network. Distribution automation terminals are an important component of distribution automation systems. With the large-scale popularization and application of the distribution automation system in national power grids and southern power grids, the number of distribution automation terminals, matched communication systems and distribution master stations is in a explosive growth situation. At present, the distribution automation terminals of a plurality of cities reach tens of thousands of levels, and a distribution automation main station and the distribution automation terminals realize bidirectional interaction through a communication system, so that informatization support is provided for the scheduling, operation and maintenance of a distribution network.
In order to improve the operation familiarity of employees on the distribution automation system and judge the knowledge achievement degree of the employees on the power distribution automation system in the aspects of fault location, fault isolation and non-fault area power supply recovery, a practical training platform of the distribution automation system is necessary to be established.
The existing power distribution automation system training platform is constructed on the basis of real power distribution automation terminals and power distribution master stations, and is wide in occupied area, large in economic investment and inconvenient to popularize and apply in technical colleges of the industry.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: a power distribution automation system practical training method and a practical training platform based on a raspberry group are provided, and are used for achieving a simulation function of a power distribution automation system.
The technical scheme adopted by the invention for solving the technical problems is as follows: a power distribution automation system training method based on a raspberry pi comprises the following steps:
s0: building a power distribution automation system training platform based on a raspberry group according to a typical power distribution line topological structure, wherein the power distribution automation system training platform comprises the raspberry group and a power distribution line micro training device; the distribution line micro practical training device is a low-voltage direct-current circuit comprising a plurality of distribution sections, and comprises a battery power supply module, a resistance load, a relay, a short-circuit module and a Hall sensor; the coil end of the relay and the controlled end of the short circuit module are respectively connected with the GPIO port of the raspberry group; the contact end of the relay is connected in series between the output end of the battery power supply module and the resistance load; the short circuit module is connected in parallel at two ends of the resistance load; the signal output end of the Hall sensor is connected with a GPIO port of the raspberry group;
s1: the raspberry group outputs a control command through the GPIO port to control the relay state of the distribution line micro practical training device;
s2: the training personnel respectively input the opening and closing control command time sequence of each relay;
s3: the raspberry collects the voltage and current states of the micro practical training device of the distribution line through the Hall sensor, judges the mastery condition score of practical training personnel on the action logic skills of the distribution automation system according to the received voltage and current states, and displays the impact current in the circuit and the power failure time of the resistance load.
According to the scheme, in the step S1, the specific steps are as follows: and setting a fault position in the ith section of the power distribution line micro practical training device through the raspberry group, and controlling a short circuit module connected to the ith section to generate a fault.
Further, in step S2, the specific steps include: let S m,i (t a ,t b ) The status flag is set by a practical training staff for the mth relay when the ith section is in fault, j represents a set specific state, j equals to 1 and represents that the relay is in a closed state, and j equals to 0 and represents an open state; when the short circuit module of the ith section has a fault, the practical training personnel respectively inputs N in total r The opening and closing control command time sequence of each relay controls the mth relay to be in the time period t greater than the time t a And is less than time t b Internal action, making the state flag S m,i (t a ,t b )＝j。
Further, in step S3, the specific steps include:
let i k Dispatching the received current of the k-th section for the raspberry, i set Is expressed as a predetermined current threshold, n (i) k ＞i set ) For the time when the current of the k-th section exceeds the current threshold, d set To the circuit breaker trip time after detection of a fault current;
let N l Total number of distribution sections, load, for a distribution line mini-training device m For the power flowing through the m-th resistive load, N load For an overview of the resistive loads of the distribution line miniature practical training device,
the bar indicates that the mth resistance load is not connected to the ith section;
the raspberry group judges the mastery condition Score of the practical training personnel on the action logic skills of the power distribution automation system according to the received voltage and current states:
if the time that the current of the kth section exceeds the current threshold is greater than the tripping time of the breaker after the fault current is detected, the Score of the grasping condition of the practical training personnel is 0;
if the time that the current of the kth section exceeds the current threshold is greater than the tripping time of the circuit breaker after the fault current is detected, and the power flowing through the resistance load which is not accessed to the ith section is 0, the grasping condition Score of the practical training personnel is 80;
and if the time that the current of the kth section exceeds the current threshold is longer than the tripping time of the breaker after the fault current is detected and the power of the resistive load of the ith section is not 0, the Score of the grasping condition of the practical training personnel is 100.
A power distribution automation system training platform based on a raspberry group comprises a raspberry group and a power distribution line micro training device; the distribution line micro practical training device is a low-voltage direct-current circuit and comprises a battery power supply module, a resistance load, a relay, a short-circuit module and a Hall sensor; the coil end of the relay and the controlled end of the short circuit module are respectively connected with a GPIO port of the raspberry pi and used for receiving a control command sent by the raspberry pi; the contact end of the relay is connected in series between the output end of the battery power supply module and the resistance load; the short circuit module is connected in parallel at two ends of the resistance load; the raspberry group is used for controlling the relay and the short circuit module through the GPIO library and simulating the function of the power distribution automation main station to realize the opening and closing of a circuit; and the signal output end of the Hall sensor is connected with the GPIO port of the raspberry group and used for uploading the collected voltage and current.
Further, the distribution line micro practical training device comprises 6 distribution sections; the distribution line micro practical training device comprises 5 resistive loads and 7 relays.
A computer storage medium having stored therein a computer program executable by a computer processor, the computer program executing a raspberry-based power distribution automation system training method.
The invention has the beneficial effects that:
1. according to the power distribution automation system training method and the training platform based on the raspberry group, the typical power distribution line micro training device is built on the raspberry group according to the typical power distribution line topological structure, and the simulation function of the power distribution automation system is realized by controlling the states of the relay and the short circuit module of the power distribution automation system.
2. The control of the relays of the whole circuit is realized according to the opening and closing control command time sequence input by the practical training personnel, and the mastering condition of the practical training personnel on the action logic skills of the power distribution automation system is judged according to the monitored actual running state of the power distribution line, so that the grading function of the practical training personnel is realized.
3. The invention has small floor area, good economy and low cost, and is suitable for popularization in the field of teaching experiments.
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FIG. 1 is an architectural diagram of an embodiment of the present invention.
FIG. 2 is a flow chart of the construction of an embodiment of the present invention.
FIG. 3 is a component numbering diagram of an embodiment of the present invention.
Fig. 4 is a timing diagram of a relay opening and closing control command input by a training person according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Referring to fig. 1, in the embodiment of the present invention, a relay and a current-voltage sensor are connected to a general purpose input/output port (GPIO port) of a raspberry pi, so as to implement the relay opening and closing operation and corresponding current-voltage acquisition by the raspberry pi; placing the relay in a circuit with the same topology as a typical distribution line; finally, action logic setting and control of relays at all positions of the circuit and collection of current and voltage are achieved through the raspberry pie, and the raspberry pi-type relay can be used for simulating the whole automatic operation process of power distribution.
Referring to fig. 2, the power distribution automation system training method based on the raspberry pi of the present invention includes the following steps:
s1: and constructing a typical distribution line micro practical training device according to a typical distribution line topological structure. Firstly, establishing a Printed Circuit Board (PCB) Circuit with a 5V voltage level, keeping a Circuit topological structure consistent with a topological structure of a typical distribution line, and reserving access positions of a relay module, a resistance load, a lithium battery power supply module and a Hall sensor; and then the relay module, the resistance load, the lithium battery power supply module, the short circuit module and the Hall sensor are connected into the PCB circuit.
S2: through the control signal line, connect hall sensor, relay, short circuit module into the GPIO mouth of raspberry group, realize the collection of voltage electric current and the control of relay.
S3: the GPIO port of the raspberry pi is used for controlling the states of the relays and the short circuit module, and simulation of the power distribution automation system is achieved. Unified control of the raspberry dispatching to each relay and the short circuit module is achieved through a GPIO library, and functions of a power distribution automation master station are simulated; each relay and the matched Hall sensor simulate a distribution automation terminal and a distribution switch, so that the collection of voltage and current and the opening and closing of a circuit are realized.
S4: on a power distribution automation system simulation platform realized by a raspberry group, a fault position is given, a corresponding short circuit module is controlled to generate a fault, the relay of the whole circuit is automatically controlled according to an opening and closing control command time sequence of each relay input by practical training personnel, scores of the practical training personnel are given, and impact current and resistance load power failure time in the circuit are displayed, so that the operation familiarity of the practical training personnel on the operation of the power distribution automation system is improved.
S41: the given fault position is located in a section i of the typical distribution line micro practical training device, namely, a short circuit module connected to the section i is controlled to have a fault, and practical training personnel are required to input all N r The opening and closing control command sequence of each relay is specifically the state mark S of the given mth relay in the fault of the section i m，i In the format S m,i (t a ,t b ) J, wherein S m,i (t a ,t b ) When the m-th relay fails in the section i, the m-th relay is in the state of being more than the time t a And less than time t b And j represents a specific set state, j equals 1 represents that the relay is in a closed state, and j equals 0 represents an open state.
S42: according to all N set by the training personnel r The open-close control command time sequence of each relay, the raspberry sends the control command through the GPIO port, the relay state of the typical distribution line micro practical training device is controlled truly, and the voltage and current state in the typical distribution line micro practical training device circuit is collected.
S43: according to the voltage and current states monitored in the whole process, the Score of mastering conditions of the practical training personnel on the action logic skills of the power distribution automation system is judged, and the Score is specifically as follows:
in the above formula, i set Indicating that the current threshold value set in advance by the trainer is achieved; i.e. i k Representing the current of the kth distribution line section of the typical distribution line micro practical training device obtained by raspberry group monitoring; n (i) k ＞i set )＞d set The time representing the current of the kth distribution line section exceeding the current threshold exceeds d set ，d set The value is generally determined by the time of tripping of the circuit breaker after the fault current is detected, and is generally taken as 1 s; n is a radical of l Representing the total number of the distribution line sections of the typical distribution line micro practical training device; load m Representing the power flowing through the m-th resistive load, N load A resistive load summary representative of a typical distribution line miniature training apparatus;
indicating that the mth resistive load is not connected to the set failure zone i.
The power distribution automation system practical training platform based on the raspberry pi is realized through the four steps.
In order to explain the effectiveness of a raspberry group-based power distribution automation system practical training platform, a power distribution line of the power distribution line micro practical training device shown in fig. 1 is taken as an example for explanation. The total number of the resistance loads is 5, the number of the power distribution sections is 6, and the number of the relays is 7, and the specific number is shown in figure 3.
The failure section is set to be a section 3, and the sequence of opening and closing control commands of the relays 1, 2, 3, 4, 5, 6 and 7 set by a training person is shown in fig. 4.
In the open-close control command given in fig. 4, relay 1 is opened and closed after 1s delay after detecting a fault (a fault at 0s, relay 3 is closed at 16 s); the relays 1, 2, 3 follow the action logic of the distribution automation terminals in place (tripping can be realized by detecting voltage loss, closing is realized by detecting the time delay of incoming voltage for 5s, and self is locked if the time interval from closing to tripping is less than 7 s). After the raspberry pi sends the opening and closing control command time sequence of each relay in fig. 4, the monitored current and load finally show that the duration of the current exceeding the set threshold is not more than 1s, and except that the resistive load 3 loses power supply (the resistive load 3 is connected to the fault section 3), other loads recover normal power supply. Therefore, the score of the practical training personnel who give the switching control command shown in fig. 4 is 100 points, and the results show that the practical training personnel master the skills of fault location, fault isolation and power supply recovery of the non-fault area of the distribution automation system.
The above embodiments are only used for illustrating the design idea and features of the present invention, and the purpose of the present invention is to enable those skilled in the art to understand the content of the present invention and implement the present invention accordingly, and the protection scope of the present invention is not limited to the above embodiments. Therefore, all equivalent changes and modifications made in accordance with the principles and concepts disclosed herein are intended to be included within the scope of the present invention.
Claims (7)
1. A power distribution automation system training method based on a raspberry group is characterized in that: the method comprises the following steps:
s0: building a power distribution automation system training platform based on a raspberry group according to a typical power distribution line topological structure, wherein the power distribution automation system training platform comprises the raspberry group and a power distribution line micro training device; the distribution line micro practical training device is a low-voltage direct-current circuit comprising a plurality of distribution sections, and comprises a battery power supply module, a resistance load, a relay, a short-circuit module and a Hall sensor; the coil end of the relay and the controlled end of the short circuit module are respectively connected with the GPIO port of the raspberry group; the contact end of the relay is connected in series between the output end of the battery power supply module and the resistance load; the short circuit module is connected in parallel at two ends of the resistance load; the signal output end of the Hall sensor is connected with a GPIO port of the raspberry pi;
s1: the raspberry group outputs a control command through the GPIO port to control the relay state of the power distribution line micro practical training device;
s2: the training personnel respectively input the opening and closing control command time sequence of each relay;
s3: the raspberry collects the voltage and current states of the micro practical training device of the distribution line through the Hall sensor, judges the mastery condition score of practical training personnel on the action logic skills of the distribution automation system according to the received voltage and current states, and displays the impact current in the circuit and the power failure time of the resistance load.
2. The raspberry pi based power distribution automation system training method of claim 1, wherein: in the step S1, the specific steps are: and setting a fault position in the ith section of the power distribution line micro practical training device through the raspberry group, and controlling a short circuit module connected to the ith section to generate a fault.
3. The raspberry pi based power distribution automation system training method of claim 2, wherein: in the step S2, the specific steps are as follows: let S m,i (t a ,t b ) The status flag is set by a practical training staff for the mth relay when the ith section is in fault, j represents a set specific state, j equals to 1 and represents that the relay is in a closed state, and j equals to 0 and represents an open state; when the short circuit module of the ith section has a fault, the practical training personnel respectively inputs N in total r The opening and closing control command time sequence of each relay controls the mth relay to be in the time period t greater than the time t a And is less than time t b Internal action, making the state flag S m,i (t a ,t b )＝j。
4. The raspberry pi based power distribution automation system training method of claim 3, wherein: in the step S3, the specific steps are as follows:
let i k Dispatching the received current of the k-th section for the raspberry, i set Is expressed as a predetermined current threshold, n (i) k ＞i set ) For the time when the current of the k-th section exceeds the current threshold, d set To the circuit breaker trip time after detection of a fault current;
let N l Total number of distribution sections, load, for a distribution line mini-training device m For the power flowing through the m-th resistive load, N load For an overview of the resistive loads of the distribution line miniature practical training device,
the bar indicates that the mth resistance load is not connected to the ith section;
the raspberry group judges the mastery condition Score of the practical training personnel on the action logic skills of the power distribution automation system according to the received voltage and current states:
if the time that the current of the kth section exceeds the current threshold is greater than the tripping time of the breaker after the fault current is detected, the Score of the grasping condition of the practical training personnel is 0;
if the time that the current of the kth section exceeds the current threshold is greater than the tripping time of the circuit breaker after the fault current is detected, and the power flowing through the resistance load which is not accessed to the ith section is 0, the grasping condition Score of the practical training personnel is 80;
and if the time that the current of the kth section exceeds the current threshold is greater than the tripping time of the breaker after the fault current is detected and the power of the resistive load of the ith section is not 0, the Score of the grasping condition of the practical training personnel is 100.
5. A practical training platform for the raspberry pi based power distribution automation system practical training method of any one of claims 1 to 4, characterized by: the device comprises a raspberry group and a micro practical training device of a distribution line;
the distribution line micro practical training device is a low-voltage direct-current circuit and comprises a battery power supply module, a resistance load, a relay, a short-circuit module and a Hall sensor; the coil end of the relay and the controlled end of the short circuit module are respectively connected with a GPIO port of the raspberry pi and used for receiving a control command sent by the raspberry pi; the contact end of the relay is connected in series between the output end of the battery power supply module and the resistance load; the short circuit module is connected in parallel at two ends of the resistance load; the raspberry group is used for controlling the relay and the short circuit module through the GPIO library and simulating the function of the power distribution automation main station to realize the opening and closing of a circuit; and the signal output end of the Hall sensor is connected with the GPIO port of the raspberry group and used for uploading the collected voltage and current.
6. The power distribution automation system training platform of claim 5, wherein:
the distribution line micro practical training device comprises 6 distribution sections; the distribution line micro practical training device comprises 5 resistive loads and 7 relays.
7. A computer storage medium, characterized in that: stored therein is a computer program executable by a computer processor, the computer program performing a raspberry pi based power distribution automation system training method as claimed in any one of claims 1 to 4.
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