CN-122001099-A - Remote power cut and transmission method and system based on power loop multidimensional monitoring and control

CN122001099ACN 122001099 ACN122001099 ACN 122001099ACN-122001099-A

Abstract

The invention relates to the technical field of data processing, in particular to a remote power interruption and transmission method and system based on power loop multidimensional monitoring and control. The method comprises the steps of collecting voltage sequences and current sequences of an incoming line side and an outgoing line side of a circuit breaker in each power frequency period, obtaining instantaneous active power difference values and current effective values of each sampling point in each power frequency period, obtaining static equivalent resistance of a contactor contact in each power frequency period based on the instantaneous active power difference values and the current effective values, obtaining micro-arc risk indexes of each power frequency period based on the instantaneous active power difference values, obtaining thermal safety residual capacity of each power frequency period according to the static equivalent resistance, the current effective values and the micro-arc risk indexes, and controlling remote power interruption and power transmission of the contactor according to the thermal safety residual capacity.

Inventors

CHEN WEINING
HAN XIONG
SU JIANBO
LIN PENG
ZHANG MINGMING
CHEN QIWEI

Assignees

山西华控伟业科技股份有限公司

Dates

Publication Date: 20260508
Application Date: 20260410

Claims (10)

1. The remote power cut and transmission method based on the power loop multidimensional monitoring and control is characterized by comprising the following steps of: Acquiring a voltage sequence and a current sequence of an incoming line side of the circuit breaker and an outgoing line side of the contactor in each power frequency period, and acquiring an instantaneous active power difference value of each sampling point in each power frequency period based on the instantaneous power input by the incoming line side of the circuit breaker and the instantaneous power output by the outgoing line side of the contactor; acquiring a current effective value of each power frequency period based on current values of all sampling points on the incoming line side of the circuit breaker in each power frequency period, acquiring a static equivalent resistance of a contactor contact of each power frequency period based on an instantaneous active power difference value of each sampling point in each power frequency period and combining the current effective values, and acquiring a micro-arc risk index of each power frequency period based on the instantaneous active power difference value of each sampling point in each power frequency period; And controlling remote power interruption and transmission of the contactor according to the thermal safety residual capacity of each power frequency period so as to realize safety control of a power loop.
2. The method for remotely stopping and transmitting power based on multi-dimensional monitoring and control of power loop according to claim 1, wherein said obtaining the instantaneous active power difference value of each sampling point in each power frequency period comprises: ; in the formula, Representing the instantaneous active power difference value of the ith sampling point in the t power frequency period; representing the voltage value of the incoming line side of the circuit breaker at the ith sampling point in the t power frequency period; representing the current value of the incoming line side of the circuit breaker at the ith sampling point in the t power frequency period; Representing the voltage value of the outlet side of the contactor at the ith sampling point in the t power frequency period; Representing the current value of the outlet side of the contactor at the ith sampling point in the t power frequency period, and representing the absolute value sign.
3. The method for remotely stopping and transmitting power based on multi-dimensional monitoring and control of power loop according to claim 1, wherein said obtaining the current effective value of each power frequency period comprises: And calculating the root mean square value of the current values of all sampling points at the incoming line side of the circuit breaker in the t power frequency period, and taking the root mean square value as the current effective value of the t power frequency period.
4. The method for remotely controlling power interruption and transmission based on power loop multidimensional monitoring and control of claim 1, wherein the step of obtaining the static equivalent resistance of the contactor contact in each power frequency period comprises the steps of: ; in the formula, The static equivalent resistance of the t power frequency period is represented, and the numerical value of the static equivalent resistance directly corresponds to the contact state of the contact; representing the average value of the instantaneous active power differences of all sampling points in the t power frequency period; Representing the effective current value of the t power frequency period; representing a preset super parameter for avoiding denominator being 0; representing a pre-calibrated reference value for the inherent impedance of the circuit breaker to contactor wire.
5. The method for remotely controlling and stopping power transmission based on multi-dimensional monitoring and control of a power loop according to claim 1, wherein the step of obtaining the micro arc risk index of each power frequency period comprises the steps of: ; in the formula, Representing a micro-arc risk index of a t-th power frequency period; Representing the instantaneous active power difference value of the ith sampling point in the t power frequency period; representing the average value of the instantaneous active power differences of all sampling points in the t power frequency period; representing the number of sampling points in the t power frequency period.
6. The method for remotely controlling power interruption and transmission based on multi-dimensional monitoring and control of a power loop according to claim 1, wherein the step of obtaining the thermal safety residual capacity of each power frequency period comprises the steps of: ; in the formula, Representing the thermal safety residual capacity of the t power frequency period; Representing a maximum thermal capacity threshold allowed for the contact material; representing the total number of historical periods of the t power frequency period; a current effective value representing a kth historical period of a kth power frequency period; A static equivalent resistance representing a kth historical period of a kth power frequency period; Representing the duration of a power frequency period; Representing a micro-arc risk index of a t-th power frequency period; an acceleration weight coefficient representing thermal damage by the micro-arc; Representing a logarithmic function.
7. The method for remotely controlling power interruption and transmission based on multi-dimensional monitoring and control of a power loop according to claim 1, wherein the controlling the remotely controlling the power interruption and transmission of the contactor according to the thermal safety residual capacity of each power frequency period comprises: when the thermal safety residual capacity of the t power frequency period is greater than 0, the contactor continues to be attracted, the system is operated normally in a power-preserving mode, when the thermal safety residual capacity of the t power frequency period is equal to 0, the system immediately triggers an early warning instruction to prompt the preparation of shutdown, and when the thermal safety residual capacity of the t power frequency period is less than 0, an emergency brake-separating control instruction is immediately executed to forcibly cut off the contactor.
8. The method for remotely stopping and transmitting power based on multi-dimensional monitoring and control of a power loop according to claim 1, wherein the step of collecting the voltage sequence and the current sequence of the incoming line side and the outgoing line side of the contactor in each power frequency period comprises the following steps: Based on sampling time intervals And presetting the duration of the power frequency period, and simultaneously collecting voltage data and current data of the incoming line side of the circuit breaker at each sampling point in each power frequency period, and voltage data and current data of the outgoing line side of the contactor at each sampling point in each power frequency period to obtain a voltage sequence and a current sequence of the incoming line side of the circuit breaker in each power frequency period and a voltage sequence and a current sequence of the outgoing line side of the contactor in each power frequency period.
9. The method for remotely disabling power delivery based on power loop multi-dimensional monitoring and control of claim 8, wherein the acquisition of the sampling time interval comprises: The preset power frequency period is as long as Presetting the number of sampling points of each power frequency period as Sampling time interval 。
10. The remote power cut and delivery system based on power loop multidimensional monitoring and control is characterized by comprising a processor and a memory, wherein the memory stores computer program instructions which when executed by the processor realize the remote power cut and delivery method based on power loop multidimensional monitoring and control according to any one of claims 1-9.

Description

Remote power cut and transmission method and system based on power loop multidimensional monitoring and control Technical Field The invention relates to the technical field of data processing, in particular to a remote power interruption and transmission method and system based on power loop multidimensional monitoring and control. Background In continuous production industries such as coal mines, chemical industry, metallurgy and the like, remote centralized control of a power loop is a key link for realizing automation and less-humanized operation and maintenance of a production process. The contactor is used as a core switching device for executing a remote power-on and power-off command, and the contact state of the contactor directly determines the operation safety and reliability of a power supply loop. However, in an actual industrial remote control scenario, when the existing monitoring and control technology faces a complex working condition, the following prominent technical limitations still exist: The existing algorithm generally collects current or voltage data of the outlet side of the contactor, judges the state of a loop based on current or voltage effective values (RMS), wherein the current or voltage effective values are obtained by carrying out integral average on all current or voltage data in a power frequency period, and judges whether the contactor contacts are aged or not by judging whether the current or voltage effective values are in a normal threshold range or not. However, in the initial stage of contact aging, the failure mode is often expressed as micro tremble or local micro arc discharge of a contact in millisecond level, the duration time of the transient physical phenomenon is extremely short, the energy density is highly concentrated, but the traditional algorithm can smoothly filter out the high-frequency and weak fault characteristics, so that the fault characteristics are submerged by normal signals, the current data read by a central control system or an operator is still in a normal threshold range, the contact of the field contactor has early faults, and at the moment, remote breaking and sucking operation is carried out, so that contact fusion welding, interphase short circuit and explosion accidents are extremely easy to be caused, and serious equipment damage is caused. Disclosure of Invention The invention provides a remote power interruption and transmission method and system based on power loop multidimensional monitoring and control, which are used for solving the technical problem that when a loop state is judged based on a current or voltage effective value in the prior art, contact microscopic tremble or local micro arc discharge high-frequency and weak fault characteristics are easy to filter smoothly. In a first aspect, the invention provides a remote power interruption and transmission method based on power loop multidimensional monitoring and control, which adopts the following technical scheme: a remote power cut and transmission method based on power loop multidimensional monitoring and control comprises the following steps: Acquiring a voltage sequence and a current sequence of an incoming line side of the circuit breaker and an outgoing line side of the contactor in each power frequency period, and acquiring an instantaneous active power difference value of each sampling point in each power frequency period based on the instantaneous power input by the incoming line side of the circuit breaker and the instantaneous power output by the outgoing line side of the contactor; acquiring a current effective value of each power frequency period based on current values of all sampling points on the incoming line side of the circuit breaker in each power frequency period, acquiring a static equivalent resistance of a contactor contact of each power frequency period based on an instantaneous active power difference value of each sampling point in each power frequency period and combining the current effective values, and acquiring a micro-arc risk index of each power frequency period based on the instantaneous active power difference value of each sampling point in each power frequency period; And controlling remote power interruption and transmission of the contactor according to the thermal safety residual capacity of each power frequency period so as to realize safety control of a power loop. The invention has the innovation that the instantaneous active power difference value is constructed by synchronously collecting current data and voltage data of the incoming line side and the outgoing line side of the circuit breaker, the power consumed by all resistive elements (wire resistance and contact resistance) in the circuit can be accurately captured, a core quantitative basis is provided for the detection of the health state of the contactor, further, the static equivalent resistance of the contactor contact in each power frequency period is obtained based