CN116417968B - Low-voltage relay protection method based on low-code controller - Google Patents
Low-voltage relay protection method based on low-code controller Download PDFInfo
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- 238000011217 control strategy Methods 0.000 claims description 6
- 238000011161 development Methods 0.000 abstract description 6
- 230000000007 visual effect Effects 0.000 abstract description 2
- 238000004088 simulation Methods 0.000 description 10
- 238000010586 diagram Methods 0.000 description 5
- 238000010276 construction Methods 0.000 description 3
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/006—Calibration or setting of parameters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/02—Details
- H02H3/027—Details with automatic disconnection after a predetermined time
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/28—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured for meshed systems
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- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The invention discloses a low-voltage relay protection method based on a low-code controller, which belongs to the field of relay protection, adopts an AOE network to model a low-voltage relay protection strategy, judges an occurrence event in an AOE node by utilizing collected current quantity, and executes a required action in an AOE side, thereby realizing three protection strategies of instantaneous current quick-break protection, time-limited current quick-break protection and overload protection; the invention provides a low-voltage relay protection method based on a low-code controller, which carries out visual modeling on a low-voltage relay protection strategy through an AOE network, flexibly realizes the low-voltage relay protection strategy in the low-code controller through an AOE network configuration mode, can obviously reduce the development and application thresholds of the low-voltage relay protection, and can realize the low-voltage relay protection in one terminal device.
Description
Technical Field
The invention relates to the technical field of relay protection, in particular to a low-voltage relay protection method based on a low-code controller.
Background
Under the construction and implementation background of a double-carbon target and a novel power system, the scale and the capacity of a distributed power supply such as a solar cell panel, a wind power generation module, an electric automobile, a fuel cell and a large-scale power generation and supply module at a user side are rapidly developed, and the method becomes one of important means for effectively reducing energy consumption, saving investment and improving energy allocation reliability and flexibility of a power grid in the energy industry. The distributed power supply is sequentially connected into the low-voltage power network, the traditional low-voltage power network structure is updated to be a multi-terminal active network structure, and complex changes are brought to the operation mode of the low-voltage power network, so that the traditional low-voltage power network relay protection configuration scheme is not applicable any more.
The relay protection device widely used at present is required to write relay protection control programs in advance by manufacturers, realize relay protection functions through simple logic judgment, has large workload required for updating and maintaining relay protection strategies, and is difficult to adapt to flexible configuration requirements of low-voltage relay protection strategies under the background of large-scale access of new energy. Meanwhile, the current microcomputer protection device is high in price, and the wide application of low-voltage transformer area protection and the development of distribution feeder automation are limited. How to enable the electrical engineering professionals with non-programming technical background to automatically realize the flexible, simple and convenient configuration change of the low-voltage relay protection strategy, and simultaneously reduce the cost of the low-voltage relay protection device, thereby being the technical problem and the blocking point of the current low-voltage relay protection development.
An Edge Activity (AOE) network is a weighted directed graph in which events are represented by vertices, directed edges representing activities, where the weights On the edges represent the duration of the Activity. AOE networks are commonly used to describe and analyze the planning and implementation of an project. Considering that the control process is usually also response processing to some states (which can be defined as events) of the controlled object, the control process can be well described by using an AOE network, and the low-code controller models the control process by adopting the AOE network, and when the control process is applied, the control strategy is converted into the AOE network to be configured, so that the control function can be realized.
Disclosure of Invention
The invention aims to provide a low-voltage relay protection method based on a low-code controller so as to solve the problems in the background technology.
In order to achieve the above purpose, the present invention provides the following technical solutions:
a low-voltage relay protection method based on a low-code controller comprises the following steps:
step 1, modeling a low-voltage relay protection strategy by adopting an AOE network, judging an event in an AOE node by utilizing the collected current amount, and executing a required action in an AOE side;
and 2, the low-code controller executes the control strategy according to the AOE network, supports configuration of the control strategy in the form of the AOE network, and configures the model obtained by modeling the AOE network in the step 1 into the low-code controller to realize the low-voltage relay protection strategy.
As a further technical scheme of the invention: the step 1 specifically comprises the following steps: 101 The relay protection strategy determines whether a fault occurs or not and issues a switch tripping instruction by logically judging signals collected by the power system, the process adopts AOE network modeling, the low-voltage relay protection adopts current protection, namely whether the fault occurs or not is judged by the collected current amount, and an AOE network of the low-voltage relay protection strategy is established; 102 Nodes are connected by directed edges in an AOE network and specific actions are performed in the edges.
As a further technical scheme of the invention: the AOE network has three segments of protection: instantaneous current quick-break protection, time-limited current quick-break protection and overload protection, wherein the instantaneous current quick-break protection and the time-limited current quick-break protection are main protection, and the overload protection is backup protection.
As a further technical scheme of the invention: the AOE network includes the following nodes:
node 1: after each time of updating of the measured current value, the initial node of the AOE network judges whether overload occurs or not by comparing the measured current value with the set overload protection current constant value, if so, the initial node of the AOE network is started to execute actions of sides 1, 2, 1, 3 and 1, 4, wherein the sides 1;2 represents the edge connecting node 1 and node 2, and so on;
node 2: judging whether the measured current value is larger than the instantaneous current quick-break protection fixed value, if so, judging that a fault occurs, and executing the actions of the sides 2 and 6;
node 3: judging whether the measured current value is larger than a time-limited current quick-break protection fixed value, if so, needing to pass the time delay time set by the time-limited current quick-break protection, judging whether the measured point current value is larger than the time-limited current quick-break protection fixed value again, and executing the actions of the edges 3 and 5;
node 4: after the delay time set by overload protection, judging whether the measured current value is larger than the overload protection current fixed value again, if so, judging that the fault occurs, and executing the actions of the edges 4 and 6;
node 5: after the time delay time set by the time-limited current quick-break protection is passed, judging whether the current value of the measuring point is larger than the fixed value of the time-limited current quick-break protection again, if so, judging that a fault occurs, and executing the actions of the edges 5 and 6;
node 6: an AOE network end node;
the actions of the AOE edge in the AOE network are as follows:
edge 1;2: entering a node 2, and further judging whether the measured current value is larger than an instantaneous current quick-break protection fixed value;
edge 2;6: a switch tripping instruction is sent, a section of protection outlet is recorded at the moment, and the protection outlet enters an ending node;
edge 1;3: entering a node 3, and further judging whether the measured current value is larger than a time-limited current quick-break protection fixed value;
edge 3, 5: recording the current time, entering a node 5, and judging whether the measured current value is larger than a time-limited current quick-break protection fixed value again after the time delay time set by the time-limited current quick-break protection in the node 5;
edge 5;6: a switch tripping instruction is sent, a two-section protection outlet is recorded at the moment, and the switch tripping instruction enters an ending node;
edge 1;4: recording the current time, entering a node 4, and judging whether the measured current value is larger than the overload protection current fixed value again after the delay time set by overload protection in the node 4;
edge 4;6: and sending a switch tripping instruction, recording the switch tripping instruction as a three-section protection outlet, and entering an end node.
As a further technical scheme of the invention: in the step 2, three sections of protection fixed values in the AOE network and delay time of limited current quick-break protection and overload protection are modified, so that protection strategy configuration can be updated, and the protection adjustment requirement caused by new energy fluctuation in the voltage power system is met.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides a low-voltage relay protection method based on a low-code controller, which carries out visual modeling on a low-voltage relay protection strategy through an AOE network, flexibly realizes the low-voltage relay protection strategy in the low-code controller through an AOE network configuration mode, can obviously reduce the development and application thresholds of the low-voltage relay protection, can realize the low-voltage relay protection in one terminal device, can effectively reduce the construction cost of the low-voltage relay protection, and is beneficial to the automatic development of distribution feeder lines.
Drawings
Fig. 1 is an AOE network diagram of the low voltage relay protection strategy of the present invention.
Fig. 2 is a schematic diagram of a simulation model of a short-circuit fault of a piezoelectric system in an embodiment of the present invention.
Fig. 3 is a schematic diagram of a result of a simulation test of a low-voltage relay protection strategy according to an embodiment of the present invention.
Fig. 4 is a schematic diagram of two results of a simulation test of a low-voltage relay protection strategy in an embodiment of the invention.
Fig. 5 is a schematic diagram of three results of a simulation test of a low-voltage relay protection strategy in the embodiment of the invention.
Detailed Description
The following will clearly and completely describe the technical solutions in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
As shown in fig. 1-5, a low-voltage relay protection method based on a low-code controller includes the following steps:
1) Modeling a low-voltage relay protection strategy by adopting an AOE network, judging an event in an AOE node by using the collected current amount, and executing a required action in an AOE edge, wherein the method comprises the following specific steps of:
101 The relay protection strategy determines whether a fault occurs or not and issues a switch tripping instruction by logically judging signals collected by the power system, and the process is very suitable for modeling by adopting an AOE network. The low-voltage relay protection generally adopts current protection, namely, whether a fault occurs is judged through the collected current quantity. The AOE network for establishing the low-voltage relay protection strategy is shown in fig. 1, and the AOE network realizes three-stage protection: instantaneous current quick-break protection, time-limited current quick-break protection and overload protection. The instantaneous current quick-break protection and the time-limited current quick-break protection are main protection, and the overload protection is backup protection. The definition of each AOE node in fig. 1 is as follows.
Node 1: an originating node of an AOE network. After each time of updating the measured current value, judging whether overload occurs or not by comparing the measured current value with the set overload protection current constant value, if so, starting the AOE network, and executing actions of sides 1, 2, 1, 3 and 1, 4.
Node 2: judging whether the measured current value is larger than the instantaneous current quick-break protection fixed value, if so, judging that the fault occurs, and executing the actions of the sides 2 and 6.
Node 3: judging whether the measured current value is larger than a time-limited current quick-break protection fixed value, if so, the time delay time set by the time-limited current quick-break protection is needed to pass, judging whether the measured point current value is larger than the time-limited current quick-break protection fixed value again, and executing the actions of the edges 3 and 5.
Node 4: after the delay time set by overload protection, judging whether the measured current value is larger than the overload protection current fixed value again, if so, judging that the fault occurs, and executing the actions of the sides 4 and 6.
Node 5: after the time delay time set by the time-limited current quick-break protection is passed, judging whether the current value of the measuring point is larger than the time-limited current quick-break protection fixed value again, if so, judging that the fault occurs, and executing the actions of the edges 5 and 6.
Node 6: the AOE network ends the node.
102 Nodes are connected by directed edges in an AOE network and specific actions are performed in the edges, defining the actions of each AOE edge in fig. 1 as follows:
edge 1;2: and entering the node 2, and further judging whether the measured current value is larger than the instantaneous current quick-break protection fixed value.
Edge 2;6: and sending a switch tripping instruction, recording that the switch tripping instruction is a section of protection outlet, and entering an end node.
Edge 1;3: and entering a node 3, and further judging whether the measured current value is larger than a time-limited current quick-break protection fixed value.
Edge 3, 5: and recording the current time, entering the node 5, and judging whether the measured current value is larger than the time-limited current quick-break protection fixed value again after the time delay time set by the time-limited current quick-break protection in the node 5.
Edge 5;6: and sending a switch tripping instruction, recording the switch tripping instruction as a two-section protection outlet, and entering an end node.
Edge 1;4: recording the current time, entering the node 4, and judging whether the measured current value is larger than the overload protection current fixed value again after the delay time set by the overload protection in the node 4.
Edge 4;6: and sending a switch tripping instruction, recording the switch tripping instruction as a three-section protection outlet, and entering an end node.
The low-code controller supports configuration of a control strategy in an AOE network mode, and the model obtained by the AOE network modeling in the step 1) is configured into the low-code controller, so that the low-voltage relay protection strategy can be realized. And modifying three-section protection fixed values in the AOE network and the delay time of the limited current quick-break protection and overload protection, so that the protection strategy configuration can be updated.
Experimental example:
and constructing a short-circuit fault simulation model of the low-voltage power system shown in fig. 2, and verifying the effectiveness of the low-voltage relay protection strategy implementation method based on the low-code controller. In fig. 2, S is a power supply node, zs is a power supply node output impedance, break is a switch, load1 and Load2 are loads, ibabc and Vabc are an ammeter and a voltmeter, respectively, and Line1 and Line2 are distribution lines. com is an S function module, realizes communication with the low-code controller, sends the measured line three-phase current maximum value and a time signal to the low-code controller, receives a control instruction of the low-code controller, and controls the switch. The Fault1, the Fault2 and the Fault3 modules are circuit ground short circuit Fault simulation modules, wherein the Fault1 module is placed in a first protection range of a circuit, the Fault2 module is placed outside the first protection range and in a second protection range, and the Fault3 module is placed outside the second protection range and in a third protection range.
Setting short-circuit fault in a protection range of the circuit, simulating to obtain current on the circuit as shown in figure 3, wherein the simulation model receives a switch tripping instruction 0.02s after the fault occurs, and cuts off the fault 0.024s after the fault occurs.
Short-circuit faults are arranged outside the first-section protection range and in the second-section protection range of the circuit, the current on the circuit is obtained through simulation, as shown in fig. 4, the simulation model receives a switch tripping instruction after the fault occurs for 0.08s, and the fault is removed after the fault occurs for 0.084 s.
And setting short-circuit faults in the protection ranges of the second section and the third section of the circuit, simulating to obtain the current on the circuit, wherein the current is shown in fig. 5, the simulation model receives a switch tripping instruction 1.02s after the fault occurs, and the fault is cut off 1.024s after the fault occurs.
By combining the analysis results, the low-voltage relay protection strategy implementation method based on the low-code controller can reliably and selectively cut off faults, and the effectiveness of the method is verified. According to the invention, the AOE network is adopted to intuitively model the low-voltage relay protection strategy, the low-voltage relay protection strategy is flexibly realized in the low-code controller through the AOE network configuration mode, the development and application threshold of the low-voltage relay protection can be obviously reduced, meanwhile, the low-voltage relay protection is realized in one terminal device, and compared with the microcomputer protection device, the low-voltage relay protection construction and application cost can be obviously reduced.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.
Claims (1)
1. The low-voltage relay protection method based on the low-code controller is characterized by comprising the following steps of:
step 1, modeling a low-voltage relay protection strategy by adopting an AOE network, judging an event in an AOE node by utilizing the collected current amount, and executing a required action in an AOE edge, wherein the step 1 specifically comprises the following steps: 101 The relay protection strategy determines whether a fault occurs or not and issues a switch tripping instruction by logically judging signals collected by the power system, the process adopts AOE network modeling, the low-voltage relay protection adopts current protection, namely whether the fault occurs or not is judged by the collected current amount, and an AOE network of the low-voltage relay protection strategy is established; 102 Connecting nodes by directed edges in an AOE network, and performing specific actions in the edges, the AOE network having three segments of protection: instantaneous current quick-break protection, time-limited current quick-break protection and overload protection, wherein the instantaneous current quick-break protection and the time-limited current quick-break protection are main protection, and the overload protection is backup protection;
the AOE network includes the following nodes:
node 1: after each time of updating of the measured current value, the initial node of the AOE network judges whether overload occurs or not by comparing the measured current value with the set overload protection current constant value, if so, the initial node of the AOE network is started to execute actions of sides 1, 2, 1, 3 and 1, 4;
node 2: judging whether the measured current value is larger than the instantaneous current quick-break protection fixed value, if so, judging that a fault occurs, and executing the actions of the sides 2 and 6;
node 3: judging whether the measured current value is larger than a time-limited current quick-break protection fixed value, if so, needing to pass the time delay time set by the time-limited current quick-break protection, judging whether the measured point current value is larger than the time-limited current quick-break protection fixed value again, and executing the actions of the edges 3 and 5;
node 4: after the delay time set by overload protection, judging whether the measured current value is larger than the overload protection current fixed value again, if so, judging that the fault occurs, and executing the actions of the edges 4 and 6;
node 5: after the time delay time set by the time-limited current quick-break protection is passed, judging whether the current value of the measuring point is larger than the fixed value of the time-limited current quick-break protection again, if so, judging that a fault occurs, and executing the actions of the edges 5 and 6;
node 6: an AOE network end node;
the actions of the AOE edge in the AOE network are as follows:
edge 1;2: entering a node 2, and further judging whether the measured current value is larger than an instantaneous current quick-break protection fixed value;
edge 2;6: a switch tripping instruction is sent, a section of protection outlet is recorded at the moment, and the protection outlet enters an ending node;
edge 1;3: entering a node 3, and further judging whether the measured current value is larger than a time-limited current quick-break protection fixed value;
edge 3, 5: recording the current time, entering a node 5, and judging whether the measured current value is larger than a time-limited current quick-break protection fixed value again after the time delay time set by the time-limited current quick-break protection in the node 5;
edge 5;6: a switch tripping instruction is sent, a two-section protection outlet is recorded at the moment, and the switch tripping instruction enters an ending node;
edge 1;4: recording the current time, entering a node 4, and judging whether the measured current value is larger than the overload protection current fixed value again after the delay time set by overload protection in the node 4;
edge 4;6: a switch tripping instruction is sent, a three-section protection outlet is recorded at the moment, and an ending node is entered;
step 2, the low-code controller executes a control strategy according to the AOE network, supports configuration of the control strategy in the form of the AOE network, and configures the model obtained by the AOE network modeling in the step 1 into the low-code controller to realize the low-voltage relay protection strategy; the three-section protection fixed value in the AOE network and the delay time of the limited current quick-break protection and overload protection are modified, so that the protection strategy configuration can be updated, and the protection adjustment requirement caused by new energy fluctuation in the voltage power system is met.
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