Relay protection device based on energy consumption management, and relay protection device software scheduling method and system

Abstract

The invention relates to a relay protection device based on energy consumption management and a relay protection device software scheduling method and system, and belongs to the technical field of power system automation devices. When the relay protection device is in a CT power supply mode, a software function module set as a first-level task in the relay protection device is in a starting state, the CT power supply stability is determined according to the monitored three-phase CT alternating current, and then the software function module set as a second-level task is scheduled to be started or closed according to the CT power supply stability. Wherein the software function module of the first-level task comprises a protection function module, and the software function module of the second-level task comprises other function modules except the protection function module; the higher the CT power supply stability is, the more the software function modules of the second-level task are started. The stable and reliable operation of the relay protection device is ensured, and the energy consumption configuration is optimized.

Description

Technical Field

[0001] The present invention relates to a relay protection device based on energy consumption management, a software scheduling method and system for a relay protection device, and belongs to the technical field of power system automation devices. Background Art

[0002] When a power component or the power system itself in the power system fails and endangers the safe operation of the power system, it is an automated measure and device that can timely send a warning signal to the on-duty operator or directly send a tripping command to the controlled circuit breaker to terminate the development of these events. The relay protection device is a complete set of equipment for implementing the above-mentioned automated measures.

[0003] Currently, in the fields of wind power, photovoltaic new energy and distribution networks, the application environment of relay protection devices is complex and diverse. It plays a major role in maintaining the safe and stable operation of electricity, and is an important part of the power system. Maloperation or refusal to operate of the relay protection device will have a great impact on power operation. Therefore, the primary task of operation and maintenance personnel is to improve the reliability of the operation of the relay protection device. The key to improving the reliability of the operation of the relay protection device is to effectively and timely calibrate and maintain the device. The power supply of the relay protection device has become the weakest link in the entire protection system, and its reliability restricts the improvement of the reliability of the entire relay protection device. There is a temporary power outage phenomenon in the relay protection device. In order to improve the adaptability and stability of the relay protection device to the application environment, a multi-power supply mode is adopted. However, in the CT power supply mode, due to the large dynamic range of the line current, it brings adverse factors to the stable operation of the relay protection device. Summary of the Invention

[0004] The purpose of the present invention is to provide a relay protection device based on energy consumption management, a software scheduling method and system for a relay protection device, so as to solve the problem of unstable operation of the relay protection device in the CT power supply mode.

[0005] To achieve the above purpose, the solution of the present invention includes: The present invention proposes a software scheduling method for a relay protection device based on energy consumption management. When the relay protection device is in the CT power supply mode, the software function modules set as first-level tasks in the relay protection device are in the startup state, and the stability of the CT power supply is determined according to the magnitudes of the monitored three-phase CT alternating currents, and then the software function modules set as second-level tasks are scheduled to start or close according to the stability of the CT power supply; among them, the software function modules of the first-level tasks include protection function modules, and the software function modules of the second-level tasks include other function modules except the protection function modules; the higher the stability of the CT power supply, the more software function modules of the second-level tasks are turned on.

[0006] Furthermore, the CT power supply stability is divided into four levels, and the power supply stabilities from high to low are as follows: Level 1: The three-phase CT alternating current is simultaneously greater than the fourth current threshold Iset4 or the alternating current of any one phase CT is greater than the fourth current threshold Iset4 multiplied by a set multiple; Level 2: The three-phase CT alternating current does not meet the conditions of Level 1, and the three-phase CT alternating current is simultaneously greater than the third current threshold Iset3 or the alternating current of any one phase CT is greater than the third current threshold Iset3 multiplied by a set multiple; Level 3: The three-phase CT alternating current does not meet the conditions of Level 2, and the three-phase CT alternating current is simultaneously greater than the second current threshold Iset2 or the alternating current of any one phase CT is greater than the second current threshold Iset2 multiplied by a set multiple; Level 4: The three-phase CT alternating current does not meet the conditions of Level 3, and the three-phase CT alternating current is simultaneously greater than the first current threshold Iset1 or the alternating current of any one phase CT is greater than the first current threshold Iset1 multiplied by a set multiple; Among them, Iset4 > Iset3 > Iset2 > Iset1, and the set multiple is greater than 1.

[0007] Furthermore, the software function modules set as secondary tasks include the 3-channel input module, the 3-channel output module, the communication function module, the LED module, the liquid crystal module, and the key module; when the CT power supply stability is at Level 1, all software function modules of the secondary task are enabled; when the CT power supply stability is at Level 2, the software function modules of the secondary task enabled include the 1-channel output module, the communication function module, the LED module, the liquid crystal module, and the key module; when the CT power supply stability is at Level 3, the software function modules of the secondary task enabled include the liquid crystal module, the key module, and the LED module; when the CT power supply stability is at Level 4, all software function modules of the secondary task are not enabled.

[0008] Furthermore, the value ranges of the first, second, third, and fourth current thresholds are respectively: the range of Iset1 is 0.1A < Iset1 ≤ 0.2A, the range of Iset2 is 0.2A < Iset2 ≤ 0.4A, the range of Iset3 is 0.4A < Iset3 ≤ 0.7A, and the range of Iset4 is 0.7A < Iset4.

[0009] Furthermore, for each power supply mode including the CT power supply mode, the auxiliary power supply mode, the USB power supply mode, and the battery power supply mode in the relay protection device, the relay protection device is powered in the order of the auxiliary power supply mode, the USB power supply mode, the CT power supply mode, and the battery power supply mode from high to low priority.

[0010] Further, if the relay protection device is in the battery power supply mode and there is no key operation after startup, the battery power supply will be automatically cut off after a set time, and the relay protection device will be shut down.

[0011] Further, the power supply mode with a higher priority than the battery power supply mode is set to not be able to actively switch to the battery power supply mode, and it can only be manually triggered to start when temporarily viewing the information of the relay protection device.

[0012] Further, when starting the relay protection device, the first-level task is started first, and the second-level task is started after running for a set time.

[0013] The beneficial effects of the present invention are as follows: The present invention provides a software scheduling method for a relay protection device based on energy consumption management. When the relay protection device is in the CT power supply mode, the software function modules set as the first-level tasks in the relay protection device are in the startup state, and the CT power supply stability is determined according to the magnitudes of the three-phase CT alternating current monitored, and then the software function modules set as the second-level tasks are scheduled to start or stop according to the CT power supply stability. Among them, the software function modules of the first-level tasks include protection function modules, and the software function modules of the second-level tasks include other function modules except the protection function modules; the higher the CT power supply stability, the more software function modules of the second-level tasks are turned on. It can cope with sudden failures during the power-on of the relay protection device and ensure the stable and reliable operation of the relay protection device under different power levels, and perform energy scheduling according to tasks in the CT power supply mode to achieve the purpose of optimizing the energy consumption configuration of the relay protection device.

[0014] The present invention also provides a software scheduling system for a relay protection device based on energy consumption management, including a processor, and the processor is used to execute a computer program to implement the steps of the above-mentioned software scheduling method for a relay protection device based on energy consumption management.

[0015] The software scheduling system for a relay protection device based on energy consumption management can achieve the same beneficial effects as the above-mentioned software scheduling method for a relay protection device based on energy consumption management.

[0016] Finally, the present invention also provides a relay protection device, including a processor, and the processor is used to execute a computer program to implement the steps of the above-mentioned software scheduling method for a relay protection device based on energy consumption management.

[0017] The relay protection device including the software scheduling system for a relay protection device based on energy consumption management can achieve the same beneficial effects as the above-mentioned software scheduling method for a relay protection device based on energy consumption management. Description of the Drawings

[0018] Figure 1 is the flowchart of the power supply mode switching of the present invention; Figure 2It is the software scheduling flowchart under the CT power supply mode of the present invention. Specific embodiments

[0019] To make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be described in detail clearly and completely below in conjunction with the accompanying drawings and embodiments.

[0020] The concept of the present invention lies in: a relay protection device, a relay protection device software scheduling method and a system based on energy consumption management according to the present invention. When the relay protection device is in the CT power supply mode, the software function modules set as first-level tasks in the relay protection device are in the startup state, and the CT power supply stability is determined according to the magnitudes of the monitored three-phase CT alternating currents, and then the software function modules set as second-level tasks are scheduled to start or close according to the CT power supply stability; wherein, the software function modules of the first-level tasks include protection function modules, and the software function modules of the second-level tasks include other function modules except the protection function modules; the higher the CT power supply stability, the more software function modules of the second-level tasks are turned on. It can cope with sudden failures during the power-on of the relay protection device and ensure the stable and reliable operation of the relay protection device under different power levels. Energy is scheduled according to tasks in the CT power supply mode to achieve the purpose of optimizing the energy consumption configuration of the relay protection device.

[0021] Embodiment of the software scheduling method for a relay protection device based on energy consumption management: This embodiment provides a software scheduling method for a relay protection device based on energy consumption management, including a method for dividing the priorities of multi-power supply modes of the relay protection device, a method for dividing software function modules based on the functional requirements of the relay protection device, and a software initialization method for the relay protection device based on the principle of optimal timeliness. According to the method, in the CT power supply mode, software scheduling is used to load the software function modules set as second-level tasks. Specifically, the software scheduling method for a relay protection device based on energy consumption management is as follows: (1) Method for dividing the priorities of multi-power supply modes of the relay protection device The relay protection device has four power supply modes: auxiliary power supply mode, USB power supply mode, CT power supply mode and battery power supply mode. The startup priority of the auxiliary power supply mode is higher than that of the USB power supply mode; the USB power supply mode priority is higher than that of the CT power supply mode; the CT power supply mode priority is higher than that of the battery power supply mode. During operation, the device preferentially selects the power supply mode with a higher priority according to the monitoring of the external power supply mode. In the battery power supply mode, the power supply is automatically cut off and the device is turned off after a set time (the set time is 15s according to experience) without key operation when starting up. It can switch to a higher priority within this time. To maintain the battery life, the higher priority cannot be switched to the battery power supply mode, and it can only be manually triggered to start when temporarily viewing the device information.

[0022] (2)Software Functional Module Division Method Based on the Functional Requirements of Relay Protection Devices According to the application scenarios, the device software functions of each power supply mode are divided into three categories: protection function, communication function, and auxiliary function. Among them, the protection function is the primary task, and the communication function and auxiliary function are secondary tasks.

[0023] (3)Software Initialization Method of Relay Protection Device Based on the Principle of Optimal Timeliness The startup process of each power supply module is divided into two stages. In the first stage, the primary task is started. Before starting the primary task, the underlying configuration module must be initialized by software, including analog quantity sampling, clock management, setting value management, input / output, storage module, recording wave module, and log management. In the second stage, the secondary task is started after the primary task is started and runs for a set time (the set time is 1 second according to experience). In the secondary task, the communication function includes the communication module, and the auxiliary function includes the LCD module, LED module, and key module. After the startup processes of the primary and secondary tasks are completed, the device software enters the normal scheduling mode.

[0024] Among them, the relay protection device starts tasks in sequence according to the above software initialization method of the relay protection device based on the principle of optimal timeliness in the auxiliary power supply mode, USB power supply mode, and battery power supply mode. The relay protection device first starts and fixedly runs the protection function divided into the primary task in the software module division method based on the device function requirements, ensuring that the protection can act within 50 ms after power-on and quickly cut off the fault. In the CT power supply mode, after the primary task is started, the analog quantity sampling module monitors the three-phase CT AC current input amplitude of the primary equipment in real time, and software schedules the software function modules of the secondary task of the relay protection device according to the input current amplitude, and starts the modules that can operate normally under the three-phase CT AC current.

[0025] As Figure 1 shown, the specific steps of a software scheduling method of a relay protection device based on energy consumption management are as follows: (1)Judge whether there is an auxiliary power supply mode. If there is an auxiliary power supply mode, further execute to load all software function modules of the secondary task. If not, enter the next priority in step 2); (2)Judge whether there is a USB power supply mode. If there is a USB power supply mode, further execute to load all software function modules of the secondary task. If not, enter the next priority in step 3); (3)Judge whether there is a CT power supply mode. If there is a CT power supply mode, further execute software scheduling to load the software function modules of the secondary task, and judge the number of software function modules of the secondary task to be loaded according to the real-time monitoring of the three-phase CT AC current input amplitude of the primary equipment by the analog quantity sampling module. If not, enter the last priority in step 4); (4) Determine whether there is a battery power supply mode. If there is a battery power supply mode, further perform the operation that after powering on without pressing the button for 15 s, the power supply is automatically cut off and the device is turned off. During this time, it is possible to switch to a high priority.

[0026] According to the above specific steps, in step 3), the CT power supply mode determines the number of software function modules for loading the secondary task according to the magnitude of the three-phase CT AC current input amplitude of the primary device monitored by the analog sampling module. For example, Figure 2 The specific software scheduling steps are as follows: (1) When the input current satisfies {(Ia > Iset4 & Ib > Iset4 & Ic > Iset4) || (Ia > 1.732 * Iset4 || Ib > 1.732 * Iset4 || Ic > 1.733 * Iset4)}, at this time, all software function modules of the secondary task are enabled by the software, including 3-channel input module, 3-channel output module, communication function module, LED module, liquid crystal module, and button module; otherwise, go to step 2; (2) When the input current satisfies {(Ia > Iset3 & Ib > Iset3 & Ic > Iset3) || (Ia > 1.732 * Iset3 || Ib > 1.732 * Iset3 || Ic > 1.733 * Iset2)}, the software function modules of the secondary task enabled by the software include 1-channel output module, communication function module, LED module, liquid crystal module, and button module, and the other 2-channel output module and 3-channel input module are turned off; otherwise, go to step 3; (3) When the input current satisfies {(Ia > Iset2 & Ib > Iset2 & Ic > Iset2) || (Ia > 1.732 * Iset2 || Ib > 1.732 * Iset2 || Ic > 1.732 * Iset2)}, the software function modules of the secondary task enabled by the software include liquid crystal module, button module, and LED module, and the 3-channel output module, 3-channel input module, and communication module are turned off; otherwise, go to step 4; (4) When the input current satisfies {(Ia > Iset1 & Ib > Iset1 & Ic > Iset1) || (Ia > 1.732 * Iset1 || Ib > 1.732 * Iset1 || Ic > 1.732 * Iset1)}, the software does not enable all software function modules of the secondary task, and only the protection function of the primary task; otherwise, end the CT power supply mode and enter the next mode according to the multi-power supply mode, that is, the battery power supply mode.

[0027] Among them, the three-phase CT alternating current is Ia, Ib, and Ic respectively, the first current threshold Iset1, the second current threshold Iset2, the third current threshold Iset3, and the fourth current threshold Iset4, and Iset4 > Iset3 > Iset2 > Iset1, ensuring that all the enabled modules can work properly under this parameter. Considering the differences in CT converters, different tripping pulse voltages, the number of panel lights, and the brightness differences of liquid crystals, in the single-phase CT power supply mode, the setting ranges of the currents are as follows: the range of Iset1 is 0.1A < Iset1 ≤ 0.2A, the range of Iset2 is 0.2A < Iset2 ≤ 0.4A, the range of Iset3 is 0.4A < Iset3 ≤ 0.7A, and the range of Iset4 is 0.7A < Iset4.

[0028] Embodiment of the software scheduling system for a relay protection device based on energy consumption management: This embodiment provides a technical solution for a software scheduling system for a relay protection device based on energy consumption management, including a processor that is used to execute a computer program to implement the steps of the above-mentioned software scheduling method for a relay protection device based on energy consumption management.

[0029] Since the specific implementation process and principle of the software scheduling system for a relay protection device based on energy consumption management in this embodiment have been described in detail in the embodiment of the software scheduling method for a relay protection device based on energy consumption management, no further elaboration will be provided here.

[0030] Embodiment of the relay protection device: This embodiment provides a relay protection device, including a protection function module, a communication function module and an auxiliary function module that the device itself has. The auxiliary function module includes an LED module, a liquid crystal module, and a button module. This relay protection device includes a software scheduling system for a relay protection device based on energy consumption management to implement the software scheduling method for a relay protection device based on energy consumption management. In case of sudden failures during the power-on of the relay protection device and under different power levels, it ensures the stable and reliable operation of the relay protection device, and performs energy scheduling according to tasks in the CT power supply mode to achieve the purpose of optimizing the energy consumption configuration of the relay protection device.

[0031] Since the specific implementation process and principle of the relay protection device in this embodiment have been described in detail in the embodiment of the software scheduling method for a relay protection device based on energy consumption management, no further elaboration will be provided here.

Claims

1. A software scheduling method for relay protection device based on energy consumption management, characterized in that: When the relay protection device is in CT power supply mode, the software function module set as the first-level task in the relay protection device is started, and the stability of the CT power supply is determined according to the monitored three-phase CT AC current, and then the software function module set as the second-level task is scheduled to start or shut down according to the stability of the CT power supply; Among them, the software function modules of the first-level task include the protection function module, and the software function modules of the second-level task include other function modules except the protection function module; the higher the CT power supply stability, the more software function modules of the second-level task are enabled.

2. The software scheduling method for relay protection device based on energy consumption management according to claim 1 is characterized in that: CT power supply stability is divided into four levels, from high to low: Level 1: The three-phase CT AC currents are simultaneously greater than the fourth current threshold Iset4 or the CT AC current of any phase is greater than the set multiple of the fourth current threshold Iset4; Level 2: The three-phase CT AC current does not meet the conditions of Level 1, and the three-phase CT AC current is greater than the third current threshold Iset3 at the same time or any phase CT AC current is greater than the third current threshold Iset3 by a set multiple; Level 3: The three-phase CT AC current does not meet the conditions of Level 2, and the three-phase CT AC current is greater than the second current threshold Iset2 at the same time or any phase CT AC current is greater than the set multiple of the second current threshold Iset2; Level 4: The three-phase CT AC current does not meet the conditions of Level 3, and the three-phase CT AC current is greater than the first current threshold Iset1 at the same time or any phase CT AC current is greater than the set multiple of the first current threshold Iset1; Among them, Iset4> Iset3> Iset2> Iset1, and the setting multiple is greater than 1.

3. The software scheduling method for relay protection device based on energy consumption management according to claim 1 is characterized in that: The software function modules set as the secondary tasks include a 3-way input module, a 3-way output module, a communication function module, an LED module, a liquid crystal module and a button module; when the CT power supply stability is at level one, all the software function modules of the secondary tasks are turned on; when the CT power supply stability is at level two, the software function modules of the secondary tasks turned on include a 1-way output module, a communication function module, an LED module, a liquid crystal module and a button module; when the CT power supply stability is at level three, the software function modules of the secondary tasks turned on include a liquid crystal module, a button module and an LED module; when the CT power supply stability is at level four, all the software function modules of the secondary tasks are not turned on.

4. The software scheduling method for relay protection device based on energy consumption management according to claim 2 is characterized in that: The value ranges of the first, second, third and fourth current thresholds are respectively: Iset1 range is 0.1A<Iset1≤0.2A, Iset2 range is 0.2A<Iset2≤0.4A, Iset3 range is 0.4A<Iset3≤0.7A, and Iset4 range is 0.7A<Iset4.

5. The software scheduling method for relay protection device based on energy consumption management according to claim 1 is characterized in that: The relay protection device includes various power supply modes including CT power supply mode, auxiliary power supply mode, USB power supply mode and battery power supply mode. The relay protection device is powered in descending order of priority of the auxiliary power supply mode, USB power supply mode, CT power supply mode and battery power supply mode.

6. The software scheduling method for relay protection device based on energy consumption management according to claim 5 is characterized in that: If the relay protection device is in battery power mode and no key operation is performed when it is turned on, the battery power will be automatically cut off after the set time, and the relay protection device will be turned off.

7. The software scheduling method for relay protection device based on energy consumption management according to claim 5 is characterized in that: The power supply mode with a higher priority than the battery power supply mode is set to not be actively switched to the battery power supply mode, and is only manually triggered to start when temporarily checking the relay protection device information.

8. The software scheduling method for relay protection device based on energy consumption management according to claim 1 is characterized in that: When starting the relay protection device, the first-level task is started first, and the second-level task is started after running for the set time.

9. A software dispatching system for relay protection devices based on energy consumption management, comprising a processor, characterized in that: The processor is used to execute a computer program to implement the steps of the software scheduling method for a relay protection device based on energy consumption management according to any one of claims 1 to 8.

10. A relay protection device, comprising a processor, characterized in that: The processor is used to execute a computer program to implement the steps of the software scheduling method for a relay protection device based on energy consumption management according to any one of claims 1 to 8.

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