CN109991559B - Monitoring data processing method and system of direct current power supply system and storage medium - Google Patents
Monitoring data processing method and system of direct current power supply system and storage medium Download PDFInfo
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Abstract
The invention relates to the technical field of power transformation, and discloses a monitoring data processing method and system of a direct current power supply system and a storage medium, so as to improve the precision and the overall performance of data processing. The method comprises the following steps: acquiring an in-phase inverse parallel connection mode of a monitored direct current power supply system, wherein the in-phase inverse parallel connection mode comprises a mode I that a valve side winding is divided into two parts at a transformer and a mode II that the valve side winding is divided into two parts at a rectifier cabinet, and the direct current power supply system measures the valve side current by using a Rogowski coil current transformer sleeved on a copper bar; in the same-phase inverse parallel connection mode I, carrying out drift revision processing on the acquired data of a current signal acquisition terminal connected with the Rogowski coil current transformer to obtain a current measurement actual value; the drift revision process includes upward-shifting revision for the positive halfwave and downward-shifting revision for the negative halfwave.
Description
Technical Field
The invention relates to the technical field of power transformation, in particular to a method and a system for processing monitoring data of a direct current power supply system and a storage medium.
Background
For most practical projects of direct current power supply systems, the distance between a network side measuring point and a filter side measuring point and other measuring points is sometimes 300 meters or more, only the distance between a valve side measuring point and a direct current side measuring point is relatively close, the operation field environment of a rectification system is severe, harmonic distortion of an alternating current and direct current system is serious, and great difficulty is brought to long-term stable operation of monitoring instruments or equipment.
At present, no real-time power consumption monitoring system or platform for each part of a high-power rectifying system exists at home and abroad, and the efficiency of rectifying equipment, particularly a rectifying transformer and a rectifier cannot be checked, so that the accuracy of design indexes cannot be verified on site, and the application and popularization of a new energy-saving method and a new technology in the field are indirectly influenced.
During actual engineering test, the energy consumption condition of a rectifier unit of a direct current power supply system is measured, a plurality of electric energy quality analyzers are generally adopted to record data of each measuring point, then the recorded data of a memory card is led into a PC (personal computer), scientific researchers list spreadsheets, and manually process and operate the data, and several days are needed. Therefore, the method has the defects of poor data synchronism, complex energy efficiency analysis method, time and labor waste, high possibility of errors and the like, and the actual operation condition of the rectifier unit cannot be reflected in real time.
In order to solve the above problems, the inventor of the present application has proposed an on-line integrated power quality and loss monitoring system for a high-power rectification system based on fiber ethernet in the CN102735979A patent, which performs real-time and synchronous measurement on voltage and current signals at multiple measurement points on the power network side, the filter side, the low-voltage valve side and the dc side, and transmits the acquired data to a background PC through a TCP/IP protocol for background software processing, so as to realize functions of network-side power quality evaluation, efficiency analysis of the system and various power consumption components, and provide good data and technical support for green, energy-saving, and efficient operation of the system. The related research also includes a doctor paper 'energy efficiency evaluation and on-line monitoring method of high-power rectification system and application research thereof' previously published by the inventor of the present application. However, the accuracy of the prior art is still low and not perfect, which can be further improved.
Disclosure of Invention
The invention aims to disclose a monitoring data processing method, a monitoring data processing system and a storage medium of a direct current power supply system so as to improve the precision and the overall performance of data processing.
In order to achieve the above object, the present invention discloses a method for processing monitoring data of a dc power supply system, comprising:
acquiring an in-phase inverse parallel connection mode of a monitored direct current power supply system, wherein the in-phase inverse parallel connection mode comprises a mode I that a valve side winding is divided into two parts at a transformer and a mode II that the valve side winding is divided into two parts at a rectifier cabinet, and the direct current power supply system measures the valve side current by using a Rogowski coil current transformer sleeved on a copper bar;
in the same-phase inverse parallel connection mode I, carrying out drift revision processing on the acquired data of a current signal acquisition terminal connected with the Rogowski coil current transformer to obtain a current measurement actual value; the drift revision processing includes upward shift revision for the positive half-wave and downward shift revision for the negative half-wave;
when the positive half wave is shifted upwards, the corresponding copper bar current sequence is stored in a temporary data buffer area, sorted from small to large according to numerical value and taken out before
Averaging the data
Then adding the values of all sampling points of the original copper bar current sequence
Revising, namely finishing the positive half-wave upward shifting revision;
when the negative half-wave downward shifting revision is carried out, the corresponding copper bar current sequence is firstly stored in a temporary data buffer area, sorted according to numerical values from large to small, and then taken out before
Averaging the data
Then, the numerical value of each sampling point of the original copper bar current sequence is reduced
Revising, namely finishing the negative half-wave downward shifting revision;
wherein n is the total number of sampling points, and when
When a remainder exists, rounding downwards; i.e. i m Is the original current sample value.
Preferably, the method of the present invention further comprises: distributed current signal and voltage signal measurement is carried out on an alternating current network side, a filtering side, a low-voltage valve side and a direct current side of the direct current power supply system based on the Internet of things; and then, calculating the energy efficiency of the direct current power supply system according to the monitoring data of the corresponding sampling points, and controlling the trigger angle of the thyristor of the direct current power supply system to be adjusted in an optimal angle range along with the change of the gear of the voltage regulator according to the calculated energy efficiency, so as to form an energy-saving closed-loop control system.
Corresponding to the method, the invention also discloses a monitoring data processing system of the direct current power supply system, which comprises a memory, a processor and a computer program which is stored on the memory and can be run on the processor, wherein the processor realizes the steps of the method when executing the computer program.
In correspondence with the above method, the invention also discloses a computer readable storage medium on which a computer program is stored, characterized in that the program realizes the steps of the above method when executed by a processor.
The invention has the following beneficial effects:
when the in-phase inverse parallel connection mode of the monitored direct current power supply system adopts a mode that a valve side winding is divided into two parts at a transformer, the problems of current positive half-wave downward drift and current negative half-wave upward drift exist when a rogowski coil current transformer is considered to measure a unipolar current signal before the synthesis of a valve side current half-wave to a full-wave, and the positive half-wave and the negative half-wave are respectively subjected to corresponding upward movement and downward movement revision of sampling data, so that the data processing precision is improved, and the overall performance of the system is improved.
The present invention will be described in further detail below with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 is a block diagram of a monitoring system of a dc power supply system according to an embodiment of the present invention.
Detailed Description
The embodiments of the invention will be described in detail below with reference to the drawings, but the invention can be implemented in many different ways as defined and covered by the claims.
Example 1
The embodiment discloses a monitoring data processing method of a direct current power supply system.
The method of the embodiment comprises the following steps:
and step S1, obtaining an in-phase inverse parallel connection mode of the monitored direct current power supply system, wherein the in-phase inverse parallel connection mode comprises a mode that a valve side winding is divided into two parts at a transformer and a mode that the valve side winding is divided into two parts at a rectifier cabinet, and the direct current power supply system measures the valve side current by a Rogowski coil current transformer sleeved on a copper bar.
Step S2, in the same-phase inverse parallel connection mode I, the collected data of the current signal collecting terminal connected with the Rogowski coil current transformer is subjected to drift revision processing to obtain a current measurement actual value; the drift revision process includes upward-shifting revision for the positive halfwave and downward-shifting revision for the negative halfwave.
In this step, specifically: when the positive half wave is shifted upwards, the corresponding copper bar current sequence is stored in a temporary data buffer area, sorted from small to large according to numerical value and taken out before
Averaging the data
Then adding the values of all sampling points of the original copper bar current sequence
And (5) revising, namely finishing the positive half-wave upward shifting revision. Wherein n is the total number of sampling points, and when
When a remainder exists, rounding downwards; i.e. i m Is the original current sample value.
In this step, specifically: when the negative half-wave downward shifting revision is carried out, the corresponding copper bar current sequence is firstly stored in a temporary data buffer area, sorted according to numerical values from large to small, and then taken out before
Averaging the data
Then, the numerical value of each sampling point of the original copper bar current sequence is reduced
And (5) revising, namely finishing the negative half-wave downward shifting revision.
Based on the prior art, the energy-saving optimization control technology of the rectification system is less researched, a coarse control management mode is mostly adopted, the rectification system usually adopts 2 controllers to respectively and independently control the gear of the voltage regulating device and the trigger angle of the thyristor, and the connection between the on-load voltage regulation of the transformer and the trigger angle of the thyristor cannot be established, so that the system has a series of problems of power factor reduction, electric energy quality deterioration, system loss increase and the like. For this reason, preferably, the method of this embodiment further includes:
step S3, carrying out distributed current signal and voltage signal measurement on an alternating current network side, a filtering side, a low-voltage valve side and a direct current side of the direct current power supply system based on the Internet of things; and then, calculating the energy efficiency of the direct current power supply system according to the monitoring data of the corresponding sampling points, and controlling the trigger angle of the thyristor of the direct current power supply system to be adjusted in an optimal angle range along with the change of the gear of the voltage regulator according to the calculated energy efficiency, so as to form an energy-saving closed-loop control system.
Therefore, the step S3 can establish the cooperative control between the voltage regulating device and the thyristor, and is very important for greatly improving the power quality and efficiency of the rectification system and realizing the energy-saving operation of the system.
In the step S3, the energy efficiency of the dc power supply system is calculated according to the monitoring data of each corresponding sampling point, which is not described herein in detail in "evaluation of energy efficiency of high power rectification system and online monitoring method and application research thereof" published by the inventor in the morning of tiger. Further, the applicant of the present application further improves the existing energy efficiency calculation and evaluation by the following steps:
the improvement is as follows:
before the energy efficiency of the direct current power supply system is calculated according to the monitoring data of each corresponding sampling point, converting the corresponding line voltage into an equivalent phase voltage according to the wiring mode of each data acquisition terminal;
when the wiring mode measured by each data acquisition terminal is three-phase and three-wire, the conversion formula is as follows:
wherein S is the serial number of a sampling point, and subscripts 1, 2 and 3 respectively represent A, B, C three-phase lines;
when the wiring mode of each data acquisition terminal is three-phase two-watt timing, the conversion formula is as follows:
the second improvement is that:
and calculating an active power value corresponding to the monitoring point corresponding to each Rogowski coil current transformer, if the active power value is a negative value, judging that the corresponding Rogowski coil current transformer is reversely connected, and performing reverse operation on the current sequence.
The improvement is that:
quantizing the harmonic waves of the monitoring data of the direct current power supply system, wherein the corresponding calculation formula of the harmonic phase angle is as follows:
A k is a real part, B k Is an imaginary part and is aligned with a real part k If A is positive or negative, the judgment is made k Negative, the harmonic phase angle is revised by θ k + π.
Based on the improvement, the data processing of the system of the invention can be more accurate, and the overall performance of the system is improved.
In this embodiment, the deployment of the corresponding monitoring system may refer to an existing optical fiber manner disclosed by CN102735979A, or may be configured in a manner based on the internet of things. As shown in fig. 1, when a wireless internet of things is adopted, a corresponding networking architecture includes: the system comprises a wireless data acquisition module, a wireless communication relay module, a valve side merging communication acquisition box and an upper computer function and efficiency monitoring system. Wherein:
the wireless data acquisition module comprises a network side and a filtering side wireless data acquisition terminal, acquires voltage and current of the network side and the filtering side, and forwards acquired data to the valve side merging communication acquisition box through the wireless communication relay module in a wireless communication mode.
The valve side merging communication collection box comprises a wireless communication butt joint module, a valve side and direct current side data collection terminal and an Ethernet switch, the wireless communication butt joint module reads and stores data uploaded by the wireless communication relay module, collects and stores voltage and current signals of the valve side and the direct current side, and all collected data are packaged and transmitted to the upper machine function efficiency monitoring system through the wired Ethernet.
And the upper computer function monitoring system performs algorithm analysis, processing, storage and display on the received collected data.
Because the distance between the AC network side and the filter side measuring point of the DC power supply system and other measuring points is long, the engineering wiring is complicated and the fault routing inspection and maintenance are difficult after the arrangement, the data collected by the network side and the filter side measuring point is sent to the valve side merging communication collection box of the valve side and the DC side measuring point in a wireless communication mode; the valve side and direct current side measuring points are very close to each other, so that only one valve side merging communication collecting box is configured at the two measuring points, and the two measuring points internally comprise a wireless communication docking module, a valve side data collecting terminal, a direct current side data collecting terminal and an Ethernet switch; the wireless communication docking module is responsible for receiving and storing wireless data of a network side and a filtering side, the valve side and the direct current side data acquisition terminals directly acquire and store data of corresponding measurement points, and all the measurement point data are transmitted to the upper computer energy efficiency monitoring system through the Ethernet switch in a wired communication mode.
Optionally, one end of the wireless communication docking module is in wireless communication with the wireless data acquisition module through the wireless communication relay module by using a 433MHz wireless communication module, and the other end of the wireless communication docking module is connected with the ethernet switch through an RJ45 interface and performs data interaction with the upper machine performance monitoring system through a wired ethernet; the wireless communication relay module takes an embedded chip as a control core, and extends a 433MHz wireless communication module, an RAM storage module and the like, so as to realize data forwarding between the wireless data acquisition module and the wireless communication docking module.
Optionally, the valve side data acquisition terminal and the dc side data acquisition terminal are respectively connected to the ethernet switch through RJ45 interfaces, and perform data interaction with the upper computer efficiency monitoring system through wired ethernet; and the valve side data acquisition terminal selects a conveniently detachable high-precision Rogowski coil current transformer to measure the valve side alternating current.
Optionally, the upper computer efficiency monitoring system includes communication front-end processor system software and dc power supply system efficiency monitoring platform software, both installed on the notebook computer, and connected to the ethernet switch through an RJ45 interface of the notebook computer. The main functions of the communication front-end processor system software comprise: setting of a wiring mode of measurement of each acquisition terminal, monitoring and setting of a filter side measurement point, setting of voltage and current transformer transformation ratio of each measurement point, TCP/IP data communication (issuing of data acquisition and reading commands, reading of acquired data), algorithm analysis of data acquisition of each measurement point (mainly comprising power quality analysis, harmonic calculation, loss and efficiency calculation of a rectifying system and each part and the like), and database storage; the direct current power supply system energy efficiency monitoring platform software carries out further statistical analysis on data after operation processing of the communication front-end processor by calling related parameters of a database, finally displays electric energy quality parameters of each measuring point, loss and efficiency parameters of the system and each component of the system, electric energy metering parameters of the system, voltage and current oscillograms of each measuring point, fundamental wave vector graphs, harmonic wave bar graphs and the like, has historical data storage and calling functions, and realizes energy efficiency processing of a direct current power supply system.
Example 2
Corresponding to the method, the invention also discloses a monitoring data processing system of the direct current power supply system, which comprises a memory, a processor and a computer program which is stored on the memory and can be run on the processor, wherein the processor realizes the steps of the method when executing the computer program.
Example 3
In correspondence with the above method, the invention also discloses a computer readable storage medium on which a computer program is stored, characterized in that the program realizes the steps of the above method when executed by a processor.
In summary, the monitoring data processing method, the monitoring data processing system and the storage medium of the dc power supply system disclosed in the above embodiments of the present invention have the following advantages:
when the mode that a valve side winding is divided into two parts at a transformer is adopted as the in-phase inverse parallel connection mode of the monitored direct current power supply system, the problems of current positive half-wave downward drift and current negative half-wave upward drift exist when a rogowski coil current transformer measures a unipolar current signal before the valve side current half-wave is synthesized to the full wave, and the positive half-wave and the negative half-wave are respectively subjected to upward shifting and downward shifting revision corresponding to sampling data, so that the data processing precision is improved, and the overall performance of the system is improved.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. A monitoring data processing method of a direct current power supply system is characterized by comprising the following steps:
acquiring an in-phase and inverse parallel connection mode of a monitored direct current power supply system, wherein the in-phase and inverse parallel connection mode comprises a first mode that a valve side winding is divided into two parts at a transformer and a second mode that the valve side winding is divided into two parts at a rectifier cabinet, and the direct current power supply system measures the valve side current by using a Rogowski coil current transformer sleeved on a copper bar;
in the same-phase inverse parallel connection mode I, carrying out drift revision processing on the acquired data of a current signal acquisition terminal connected with the Rogowski coil current transformer to obtain a current measurement actual value; the drift revision processing includes upward shift revision for the positive half-wave and downward shift revision for the negative half-wave;
when the positive half wave is shifted upwards, the corresponding copper bar current sequence is stored in a temporary data buffer area, sorted from small to large according to numerical value and taken out before
Averaging the data
Then adding the values of all sampling points of the original copper bar current sequence
Revising, namely finishing the positive half-wave upward shifting revision;
when the negative half-wave downward shifting revision is carried out, the corresponding copper bar current sequence is firstly stored in a temporary data buffer area, sorted from large to small according to numerical values, and then taken out before
Averaging the data
Then, the numerical value of each sampling point of the original copper bar current sequence is reduced
Revising, namely finishing the negative half-wave downward shifting revision;
wherein n is the total number of sampling points, and when
When a remainder exists, rounding downwards; i.e. i m Is the original current sample value.
2. The method for processing the monitoring data of the dc power supply system according to claim 1, further comprising:
distributed current signal and voltage signal measurement is carried out on an alternating current network side, a filtering side, a low-voltage valve side and a direct current side of the direct current power supply system based on the Internet of things;
and calculating the energy efficiency of the direct current power supply system according to the monitoring data of each corresponding sampling point, and controlling the trigger angle of the thyristor of the direct current power supply system to be adjusted in an optimal angle range along with the change of the gear of the pressure regulating device according to the calculated energy efficiency, so as to form an energy-saving closed-loop control system.
3. The method for processing the monitoring data of the direct-current power supply system according to claim 2, wherein before the energy efficiency of the direct-current power supply system is calculated according to the monitoring data of each corresponding sampling point, the corresponding line voltage is converted into an equivalent phase voltage according to the wiring mode of each data acquisition terminal;
when the wiring mode measured by each data acquisition terminal is three-phase and three-wire, the conversion formula is as follows:
wherein S is the serial number of a sampling point, and subscripts 1, 2 and 3 respectively represent A, B, C three-phase lines;
when the wiring mode of each data acquisition terminal is three-phase two-watt timing, the conversion formula is as follows:
4. the monitoring data processing method of the DC power supply system according to claim 2, wherein the Internet of things comprises: the system comprises a wireless data acquisition module, a wireless communication relay module, a valve side merging communication acquisition box and an upper computer function and efficiency monitoring system; wherein:
the wireless data acquisition module comprises a network side and a filtering side wireless data acquisition terminal, acquires voltage and current of the network side and the filtering side, and forwards acquired data to the valve side merging communication acquisition box through the wireless communication relay module in a wireless communication mode;
the valve side merging communication collection box comprises a wireless communication butt joint module, a valve side and direct current side data collection terminal and an Ethernet switch, reading and storing of data uploaded by the wireless data collection module through the wireless communication relay module and collection and storage of voltage and current signals of the valve side and the direct current side are achieved, and all collected data are transmitted to the upper machine function efficiency monitoring system through the wired Ethernet after being packaged and packaged;
and the upper computer function monitoring system performs algorithm analysis, processing, storage and display on the received collected data.
5. The method for processing the monitoring data of the dc power supply system according to any one of claims 1 to 4, further comprising:
and calculating an active power value corresponding to the monitoring point corresponding to each Rogowski coil current transformer, if the active power value is a negative value, judging that the corresponding Rogowski coil current transformer is reversely connected, and performing reverse operation on the current sequence.
6. The method for processing the monitoring data of the dc power supply system according to any one of claims 1 to 4, further comprising:
quantizing the harmonic waves of the monitoring data of the direct current power supply system, wherein the corresponding calculation formula of the harmonic phase angle is as follows:
A k is a real part, B k Is an imaginary part and is aligned with a real part k If A is positive or negative, the judgment is made k Negative, then θ is performed on the harmonic phase angle k And + pi revision.
7. Monitoring data processing system for a dc power supply system, comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor implements the steps of the method according to any of the preceding claims 1 to 6 when executing the computer program.
8. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the method of any one of the preceding claims 1 to 6.
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| CN103323663B (en) * | 2013-06-28 | 2015-12-23 | 中铝华大科技股份有限公司 | The measuring method of a kind of Rectification Power Factor DC current and rectifier loss |
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