CN115656619B - Method and system for displaying power factor of generator in DCS (distributed control system) - Google Patents
Method and system for displaying power factor of generator in DCS (distributed control system) Download PDFInfo
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Abstract
The disclosure relates to a method and a system for displaying a power factor of a generator in a DCS (distributed control system), wherein the method comprises the following steps: receiving an analog current signal output by a power factor transmitter of a generator; when the current value of the analog current signal is determined to be smaller than or equal to a preset current value, determining a first power factor corresponding to the current value of the analog current signal based on a first linear function and displaying the first power factor; the first linear function is determined in advance based on current values of a plurality of first analog current signals output by the power factor transmitter and corresponding power factors; when the current value of the analog current signal is determined to be larger than a preset current value, determining a second power factor corresponding to the current value of the analog current signal based on a second linear function and displaying the second power factor; the second linear function is determined in advance based on current values of a plurality of second analog current signals output by the power factor transmitter and the corresponding power factor.
Description
Technical Field
The embodiment of the disclosure relates to the technical field of instrument control systems, in particular to a method and a system for displaying a power factor of a generator in a DCS (Distributed Control System) system.
Background
The distributed control system, i.e. the DCS system, is widely applied in various industries such as electric power, metallurgy, petrochemical industry and the like. In a DCS system of a power plant, various electrical parameters of a generator, such as a power factor, are usually measured and displayed, and the DCS system can only recognize standard electrical signals, such as current values within a predetermined range, so that the DCS system can recognize and display the electrical parameters into the current values within the predetermined range through a transmitter.
The power factor transducer is a special transducer, the measuring range is 0.5C-1.0-0.5L, the power factor transducer outputs an electric signal of a lower limit current value in a preset range when measuring the power factor of the generator to be 0.5C, and outputs an electric signal of an upper limit current value in the preset range when measuring the power factor of the generator to be 0.5L. For the DCS system, 0.5C and 0.5L cannot be distinguished, the power factor of the generator is required to be displayed by calculating and converting the electric signal output by the power factor transmitter, but the traditional calculating and converting method is complex at present, the power factor of the generator is difficult to accurately display, and the display error is larger.
Disclosure of Invention
In order to solve the above technical problems or at least partially solve the above technical problems, an embodiment of the present disclosure provides a method and a system for displaying a power factor of a generator in a DCS system.
In a first aspect, an embodiment of the present disclosure provides a method for displaying a power factor of a generator in a DCS system, including:
receiving an analog current signal output by a power factor transmitter of a generator;
when the current value of the analog current signal is determined to be smaller than or equal to a preset current value, determining a first power factor corresponding to the current value of the analog current signal based on a first linear function and displaying the first power factor; the first linear function is determined in advance based on current values of a plurality of first analog current signals output by the power factor transmitter and corresponding power factors;
when the current value of the analog current signal is determined to be larger than the preset current value, determining a second power factor corresponding to the current value of the analog current signal based on a second linear function and displaying the second power factor; the second linear function is determined in advance based on current values of a plurality of second analog current signals output by the power factor transmitter and corresponding power factors, wherein the current values of the plurality of second analog current signals are different from the current values of the plurality of first analog current signals.
In one embodiment, the current value of the analog current signal output by the generator power factor transmitter comprises an upper limit current value and a lower limit current value, and the preset current value is the sum of the lower limit current value and a specified current value; wherein the specified current value is one half of the difference between the upper limit current value and the lower limit current value.
In one embodiment, the straight line represented by the first linear function intersects the straight line represented by the second linear function, and an abscissa corresponding to the intersection point is the preset current value.
In one embodiment, a current value of each of the first analog current signals is less than or equal to the preset current value, and a current value of each of the second analog current signals is greater than the preset current value.
In one embodiment, the first linear function is determined in advance based on current values of a plurality of first analog current signals output by the power factor transmitter and a power factor fit corresponding to each of the first analog current signals.
In one embodiment, the second linear function is determined in advance based on current values of a plurality of second analog current signals output by the power factor transmitter and a corresponding power factor fit for each of the second analog current signals.
In one embodiment, the power factor transmitter is connected with an analog signal input unit of the DCS system through a signal line, and an electromagnetic wave shielding layer is arranged on the outer surface of the signal line.
In a second aspect, embodiments of the present disclosure provide a display system for a generator power factor in a DCS system, including:
the receiving module is used for receiving an analog current signal output by the power factor transmitter of the generator;
the first display module is used for determining a first power factor corresponding to the current value of the analog current signal based on a first linear function and displaying the first power factor when the current value of the analog current signal is smaller than or equal to a preset current value; the first linear function is determined in advance based on current values of a plurality of first analog current signals output by the power factor transmitter and corresponding power factors;
the second display module is used for determining a second power factor corresponding to the current value of the analog current signal based on a second linear function and displaying the second power factor when the current value of the analog current signal is determined to be larger than the preset current value; the second linear function is determined in advance based on current values of a plurality of second analog current signals output by the power factor transmitter and corresponding power factors, wherein the current values of the plurality of second analog current signals are different from the current values of the plurality of first analog current signals.
In one embodiment, the current value of the analog current signal output by the generator power factor transmitter comprises an upper limit current value and a lower limit current value, and the preset current value is the sum of the lower limit current value and a specified current value; wherein the specified current value is one half of the difference between the upper limit current value and the lower limit current value.
In one embodiment, the straight line represented by the first linear function intersects the straight line represented by the second linear function, and an abscissa corresponding to the intersection point is the preset current value.
Compared with the prior art, the technical scheme provided by the embodiment of the disclosure has the following advantages:
according to the display method and system of the power factor of the generator in the DCS, the DCS receives the analog current signal output by the power factor transmitter of the generator, and when the current value of the analog current signal is determined to be smaller than or equal to the preset current value, a first power factor corresponding to the current value of the analog current signal is determined and displayed based on a first linear function; the first linear function is determined in advance based on current values of a plurality of first analog current signals output by the power factor transmitter and corresponding power factors; when the current value of the analog current signal is determined to be larger than the preset current value, determining a second power factor corresponding to the current value of the analog current signal based on a second linear function and displaying the second power factor; the second linear function is determined in advance based on current values of a plurality of second analog current signals output by the power factor transmitter and corresponding power factors, wherein the current values of the plurality of second analog current signals are different from the current values of the plurality of first analog current signals. According to the characteristics that the specificity of the power factor transmitter, namely the measurement range is 0.5C-1.0-0.5L, the power factor corresponding to the current value of the analog current signal output when the power factor transmitter is actually measured can be determined and displayed based on two different linear functions, such as a linear function corresponding to 0.5C-1.0 and another linear function corresponding to 1.0-0.5L, of the power factor of the generator measured by the power factor transmitter, and the power factor corresponding to the current value of the analog current signal output when the power factor transmitter is actually measured is determined based on the current values of a plurality of different analog current signals output by the power factor transmitter and the corresponding power factors, so that the characteristics of the power factor transmitter are more matched, the power factor display error of the generator in the DCS system is small, and the display accuracy is higher.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the disclosure and together with the description, serve to explain the principles of the disclosure.
In order to more clearly illustrate the embodiments of the present disclosure or the solutions in the prior art, the drawings that are required for the description of the embodiments or the prior art will be briefly described below, and it will be obvious to those skilled in the art that other drawings can be obtained from these drawings without inventive effort.
FIG. 1 is a flow chart of a method for displaying generator power factor in a DCS system in accordance with an embodiment of the present disclosure;
fig. 2 is a schematic diagram of a display system of a generator power factor in a DCS system according to an embodiment of the present disclosure.
Detailed Description
In order that the above objects, features and advantages of the present disclosure may be more clearly understood, a further description of aspects of the present disclosure will be provided below. It should be noted that, without conflict, the embodiments of the present disclosure and features in the embodiments may be combined with each other.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present disclosure, but the present disclosure may be practiced otherwise than as described herein; it will be apparent that the embodiments in the specification are only some, but not all, embodiments of the disclosure.
It should be understood that, hereinafter, "at least one (item)" means one or more, and "a plurality" means two or more. "and/or" is used to describe association relationships of associated objects, meaning that there may be three relationships, e.g., "a and/or B" may mean: only a, only B and both a and B are present, wherein a, B may be singular or plural. The character "/" generally indicates that the context-dependent object is an "or" relationship. "at least one of" or the like means any combination of these items, including any combination of single item(s) or plural items(s). For example, at least one (one) of a, b or c may represent: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", wherein a, b, c may be single or plural.
Fig. 1 is a flowchart of a method for displaying a power factor of a generator in a DCS system according to an embodiment of the present disclosure, where the method for displaying a power factor of a generator in a DCS system may include the steps of:
step S101: an analog current signal output by a power factor transmitter of the generator is received.
Specifically, the DCS system may include an analog signal input unit, a control unit, and a display device such as a display screen, etc., and other unit parts of the DCS system may be understood with reference to the prior art, and will not be described herein. The power factor transmitter can be arranged at the generator of the power plant, and is connected with an analog signal input unit of the DCS system.
Step S102: and when the current value of the analog current signal is determined to be smaller than or equal to a preset current value, determining a first power factor corresponding to the current value of the analog current signal based on a first linear function and displaying the first power factor. The first linear function is determined in advance based on current values of a plurality of first analog current signals output by the power factor transmitter and corresponding power factors.
By way of example, the specificity of the power factor transmitter, i.e., the measurement range, is 0.5C-1.0-0.5L, whereby the measurement range, i.e., 0.5C-1.0-0.5L, can be divided into two parts, i.e., a first measurement range of 0.5C-1.0 and a second measurement range of 1.0-0.5L. The first linear function characterizing the power factor of the generator measured by the power factor transmitter and the current value of the corresponding output analog current signal, i.e. the linear function corresponding to the 0.5C-1.0 measurement range, is predetermined for a first measurement range of 0.5C-1.0, and may specifically be determined based on the current values of the plurality of first analog current signals output by the power factor transmitter and the current values of the corresponding power factors, i.e. the plurality of power factors within the 0.5C-1.0 measurement range and the corresponding plurality of analog current signals.
The input variable X of the first linear function is the current value of the analog current signal output by the power factor transmitter, and the output variable Y is the corresponding power factor. Illustratively, y=ax+b. Wherein the values of a and b can be determined according to a plurality of power factors in the measuring range of 0.5C-1.0 and the current values of a plurality of corresponding analog current signals. The preset current value M is related to the measuring range of the power factor transmitter, namely 0.5C-1.0-0.5L, for example, the preset current value M is the current value of an analog current signal output by the power factor transmitter at the boundary point between the first measuring range of 0.5C-1.0 and the second measuring range of 1.0-0.5L, namely the power factor of 1.0.
Specifically, the power factor transmitter actually measures the power factor of the generator during operation, outputs a corresponding analog current signal, namely an input variable X, determines that the current value of the analog current signal, namely the input variable X, is smaller than or equal to a preset current value M, determines a first power factor corresponding to the current value of the analog current signal based on a first linear function, displays the first power factor on a display device such as a display screen, and can display a character "C" beside the first power factor during specific display.
Step S103: and when the current value of the analog current signal is determined to be larger than the preset current value, determining a second power factor corresponding to the current value of the analog current signal based on a second linear function and displaying the second power factor. The second linear function is determined in advance based on current values of a plurality of second analog current signals output by the power factor transmitter and corresponding power factors, wherein the current values of the plurality of second analog current signals are different from the current values of the plurality of first analog current signals.
For example, for a second measurement range of 1.0-0.5L, the second linear function characterizing the power factor of the generator measured by the power factor transmitter and the current value of the corresponding output analog current signal, i.e. the linear function corresponding to the measurement range of 1.0-0.5L, may be predetermined, in particular, based on the current values of a plurality of second analog current signals output by the power factor transmitter, which are different from the current values of the plurality of first analog current signals, and the current values of a corresponding power factor, i.e. a plurality of power factors within the measurement range of 1.0-0.5L and the current values of a corresponding plurality of analog current signals.
The input variable X 'of the second linear function is the current value of the analog current signal output by the power factor transmitter, and the output variable Y' is the corresponding power factor.
Illustratively, Y '= (2-b) -aX', i.e. the absolute value of the slope of the straight line each characterized by the second linear function is the same as the first linear function, and the sum of the intercept of the straight lines each characterized is equal to 2, but is not limited thereto.
Specifically, the power factor transmitter actually measures the power factor of the generator during operation, outputs a corresponding analog current signal, namely an input variable X ', and determines a second power factor corresponding to the current value of the analog current signal based on a second linear function and displays the second power factor when the current value of the analog current signal, namely the input variable X', is determined to be larger than a preset current value M, wherein the character L can be displayed beside the second power factor during specific display.
According to the scheme, according to the characteristics that the specificity of the power factor transmitter, namely the measuring range is 0.5C-1.0-0.5L, the power factor corresponding to the current value of the analog current signal output by the power factor transmitter when actually measuring can be determined and displayed based on the predetermined characteristic that the power factor of the generator measured by the power factor transmitter and two different linear functions, such as a linear function corresponding to 0.5C-1.0 and another linear function corresponding to 1.0-0.5L, of the corresponding current value of the analog current signal output by the power factor transmitter are determined, and the calculating mode is simpler, and the two linear functions are determined based on the current values of a plurality of different analog current signals output by the power factor transmitter and the corresponding power factors, so that the characteristics of the power factor transmitter are matched, the power factor of the generator in a DCS system is small in display error, and the display accuracy is higher.
In order to further improve the accuracy of the power factor display of the generator in the DCS system, in one embodiment, the current value of the analog current signal output by the power factor transmitter of the generator includes an upper limit current value a and a lower limit current value B, which define the range of the analog current signal output by the power factor transmitter, and the preset current value M is the sum of the lower limit current value B and a specified current value P, i.e. m=b+p. Wherein the specified current value P is one half of the difference between the upper limit current value a and the lower limit current value B, i.e., p= (a-B)/2.
For example, the lower limit current value B of the analog current signal output by the power factor transmitter is typically greater than zero instead of zero, so that the predetermined current value M may be determined based on the difference between the upper limit current value a and the lower limit current value B, and the lower limit current value B. The preset current value M determined based on the method can accurately define whether the first linear function or the second linear function is adopted for calculation display, and further can accurately determine the power factor corresponding to the analog current signal output by the power factor transmitter during actual measurement, so that the power factor display precision of the generator in the DCS system is further improved, and the problem of display data precision reduction caused by inaccurate definition is avoided.
On the basis of the foregoing embodiments, in one embodiment, a straight line represented by the first linear function intersects a straight line represented by the second linear function, and an abscissa corresponding to the intersection point is the preset current value M. Therefore, the first linear function and the second linear function can be used as boundary points by taking the abscissa corresponding to the preset current value M, namely the intersection point of the first linear function and the second linear function, the preset current value M determined based on the boundary points can accurately define whether the first linear function or the second linear function is adopted for calculation and display, and further the power factor corresponding to the analog current signal output by the power factor transmitter during actual measurement can be accurately determined, so that the power factor display precision of the generator in the DCS system is further improved, and the problem of display data precision reduction caused by inaccurate definition is avoided.
In one embodiment, a current value of each of the first analog current signals is less than or equal to the preset current value M, and a current value of each of the second analog current signals is greater than the preset current value M.
In one embodiment, the first linear function is determined in advance based on current values of a plurality of first analog current signals output by the power factor transmitter and a power factor fit corresponding to each of the first analog current signals. That is, a first linear function is determined based on current values of a plurality of first analog current signals smaller than or equal to the preset current value M and power factor fitting corresponding to each of the first analog current signals.
In one embodiment, the second linear function is determined in advance based on current values of a plurality of second analog current signals output by the power factor transmitter and a corresponding power factor fit for each of the second analog current signals. That is, a second linear function is determined based on current values of a plurality of second analog current signals greater than the preset current value M and a power factor fit corresponding to each of the second analog current signals.
The first linear function and the second linear function determined based on the fitting mode can be accurately matched with the characteristic of the measuring range of the power factor transmitter, and the power factor of the generator calculated and displayed based on the first linear function or the second linear function is more accurate, so that the power factor display error of the generator in the DCS system is further reduced, and the display precision is further improved.
In a specific example, the slope of the straight line represented by the first linear function may be 0.0625, the intercept may be 0.25, the slope of the straight line represented by the second linear function may be-0.0625, the intercept may be 1.75, the abscissa of the intersection point of the two straight lines is M, M is taken as a judgment point in the DCS system, the power factor is calculated by using the first linear function when the current value of the current signal output by the power factor transmitter is less than or equal to M, and the power factor is calculated by using the second linear function when the current value is greater than M. The calculation method is simple and convenient, and the power factor accuracy of the generator displayed in the DCS system is high.
On the basis of any one of the above embodiments, the method may further include the steps of:
when the power factor displayed in the DCS system is determined to be beyond the preset power factor range, the control unit issues a control instruction to the generator controller so that the generator controller controls and adjusts the rotating speed of the generator.
In the embodiment, because the power factor accuracy of the generator displayed in the DCS system is high, the rotation speed of the generator is adjusted when the displayed power factor exceeds the preset power factor range, and the working state of the generator in the power plant DCS system can be accurately adjusted.
Specifically, in one embodiment, the generator controller includes a PID controller, and the PID controller obtains a current rotation speed of the generator, and controls and adjusts the rotation speed of the generator based on the current rotation speed and a set rotation speed. PID control based on a PID controller allows for more accurate adjustment of the operating state of the generator when the power factor is displayed outside a preset power factor range.
The DCS system usually has a large number of electronic devices, and interference caused during operation, such as electromagnetic interference, has potential influence on the analog current signal output by the power factor transmitter, and the DCS system accurately receives and recognizes the analog current signal output by the power factor transmitter is particularly important for subsequent display processing, so on the basis of any one of the embodiments, in one embodiment, the power factor transmitter is connected with the analog signal input unit of the DCS system through a signal line, and the outer surface of the signal line is provided with an electromagnetic wave shielding layer. The electromagnetic wave shielding layer is arranged in the embodiment, so that the interference influence of potential electromagnetic interference caused by other electronic devices in the working field of the generator on the analog current signal to be transmitted to the analog signal input unit, which is output by the power factor transmitter, can be shielded, the DCS system can receive and recognize the accurate analog current signal to perform subsequent display processing, and the display precision of the power factor of the generator displayed in the DCS system is further improved.
In one embodiment, the electromagnetic wave shielding layer includes a plurality of first shielding wires and a plurality of second shielding wires, each of the first shielding wires being formed in a lateral direction, and each of the second shielding wires being formed in a longitudinal direction crossing the first shielding wires. The electromagnetic wave shielding layer can be a conductive material layer, so that the grid-shaped electromagnetic wave shielding layer is formed, the material cost is saved, the better electromagnetic interference shielding effect is achieved, the DCS system can receive accurate analog current signals to carry out subsequent processing, and the display accuracy of the power factor of the generator displayed in the DCS system is improved.
In one embodiment, each first shielding wire is formed in parallel to each other, each first shielding wire has a first preset width, two adjacent first shielding wires are separated from each other by a first preset distance, and the ratio of the first preset width to the first preset distance is 2:5-2:15. Based on the mode, the electromagnetic wave shielding layer in a grid shape is formed, the material cost is further saved, the better electromagnetic interference shielding effect is achieved, the DCS system can receive accurate analog current signals for subsequent processing, and the display precision of the power factor of the generator displayed in the DCS system is improved.
In one embodiment, each second shielding wire is formed parallel to each other, each second shielding wire has a second preset width, two adjacent second shielding wires are separated from each other by a second preset distance, and the ratio of the second preset width to the second preset distance is 2:5-2:15. Based on the mode, the electromagnetic wave shielding layer in a grid shape is formed, the material cost is further saved, the better electromagnetic interference shielding effect is achieved, the DCS system can receive accurate analog current signals for subsequent processing, and the display precision of the power factor of the generator displayed in the DCS system is improved.
It should be noted that although the steps of the methods of the present disclosure are illustrated in the accompanying drawings in a particular order, this does not require or imply that the steps must be performed in that particular order or that all of the illustrated steps be performed in order to achieve desirable results. Additionally or alternatively, certain steps may be omitted, multiple steps combined into one step to perform, and/or one step decomposed into multiple steps to perform, etc. In addition, it is also readily understood that these steps may be performed synchronously or asynchronously, for example, in a plurality of modules/processes/threads.
As shown in fig. 2, an embodiment of the present disclosure provides a display system of a generator power factor in a DCS system, including:
a receiving module 201, configured to receive an analog current signal output by a power factor transmitter of the generator;
a first display module 202, configured to determine, based on a first linear function, a first power factor corresponding to a current value of the analog current signal and display the first power factor when the current value of the analog current signal is determined to be less than or equal to a preset current value; the first linear function is determined in advance based on current values of a plurality of first analog current signals output by the power factor transmitter and corresponding power factors;
a second display module 203, configured to determine, based on a second linear function, a second power factor corresponding to the current value of the analog current signal and display the second power factor when the current value of the analog current signal is determined to be greater than the preset current value; the second linear function is determined in advance based on current values of a plurality of second analog current signals output by the power factor transmitter and corresponding power factors, wherein the current values of the plurality of second analog current signals are different from the current values of the plurality of first analog current signals.
In one embodiment, the current value of the analog current signal output by the generator power factor transmitter comprises an upper limit current value and a lower limit current value, and the preset current value is the sum of the lower limit current value and a specified current value; wherein the specified current value is one half of the difference between the upper limit current value and the lower limit current value.
In one embodiment, the straight line represented by the first linear function intersects the straight line represented by the second linear function, and an abscissa corresponding to the intersection point is the preset current value.
In one embodiment, a current value of each of the first analog current signals is less than or equal to the preset current value, and a current value of each of the second analog current signals is greater than the preset current value.
In one embodiment, the first linear function is determined in advance based on current values of a plurality of first analog current signals output by the power factor transmitter and a power factor fit corresponding to each of the first analog current signals.
In one embodiment, the second linear function is determined in advance based on current values of a plurality of second analog current signals output by the power factor transmitter and a corresponding power factor fit for each of the second analog current signals.
On the basis of any one of the embodiments, when it is determined that the power factor displayed in the DCS system exceeds the preset power factor range, the control unit issues a control command to the generator controller, so that the generator controller controls and adjusts the rotation speed of the generator.
In one embodiment, the generator controller includes a PID controller that obtains a current rotational speed of the generator and controls the rotational speed of the generator based on the current rotational speed and a set rotational speed.
In one embodiment, the power factor transmitter is connected with an analog signal input unit of the DCS system through a signal line, and an electromagnetic wave shielding layer is arranged on the outer surface of the signal line.
In one embodiment, the electromagnetic wave shielding layer includes a plurality of first shielding wires and a plurality of second shielding wires, each of the first shielding wires being formed in a lateral direction, and each of the second shielding wires being formed in a longitudinal direction crossing the first shielding wires.
In one embodiment, each first shielding wire is formed in parallel to each other, each first shielding wire has a first preset width, two adjacent first shielding wires are separated from each other by a first preset distance, and the ratio of the first preset width to the first preset distance is 2:5-2:15.
In one embodiment, each second shielding wire is formed parallel to each other, each second shielding wire has a second preset width, two adjacent second shielding wires are separated from each other by a second preset distance, and the ratio of the second preset width to the second preset distance is 2:5-2:15.
The specific manner in which the respective modules perform the operations and the corresponding technical effects thereof have been described in corresponding detail in relation to the embodiments of the method in the above embodiments, which will not be described in detail herein.
It should be noted that although in the above detailed description several modules or units of a device for action execution are mentioned, such a division is not mandatory. Indeed, the features and functionality of two or more modules or units described above may be embodied in one module or unit in accordance with embodiments of the present disclosure. Conversely, the features and functions of one module or unit described above may be further divided into a plurality of modules or units to be embodied. The components shown as modules or units may or may not be physical units, may be located in one place, or may be distributed across multiple network elements. Some or all of the modules can be selected according to actual needs to achieve the purpose of the wood disclosure scheme. Those of ordinary skill in the art will understand and implement the present invention without undue burden.
The disclosed embodiments also provide a computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements a method for displaying a generator power factor in a DCS system according to any of the above embodiments.
By way of example, the readable storage medium can be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or a combination of any of the foregoing. More specific examples (a non-exhaustive list) of the readable storage medium would include the following: an electrical connection having one or more wires, a portable disk, a hard disk, random Access Memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.
The computer readable storage medium may include a data signal propagated in baseband or as part of a carrier wave, with readable program code embodied therein. Such a propagated data signal may take any of a variety of forms, including, but not limited to, electro-magnetic, optical, or any suitable combination of the foregoing. A readable storage medium may also be any readable medium that can communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device. Program code embodied on a readable storage medium may be transmitted using any appropriate medium, including but not limited to wireless, wireline, optical fiber cable, RF, etc., or any suitable combination of the foregoing.
The embodiment of the disclosure also provides an electronic device comprising a processor and a memory, wherein the memory is used for storing a computer program. Wherein the processor is configured to perform the method of displaying the generator power factor in the DCS system of any of the above embodiments via execution of the computer program.
From the above description of embodiments, those skilled in the art will readily appreciate that the example embodiments described herein may be implemented in software, or may be implemented in software in combination with the necessary hardware. Thus, the technical solution according to the embodiments of the present disclosure may be embodied in the form of a software product, which may be stored in a non-volatile storage medium (may be a CD-ROM, a U-disc, a mobile hard disk, etc.) or on a network, and includes several instructions to cause a computing device (may be a personal computer, a server, or a network device, etc.) to perform the steps of the method for displaying the generator power factor in the DCS system according to the above embodiments of the present disclosure.
It should be noted that in this document, relational terms such as "first" and "second" and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The foregoing is merely a specific embodiment of the disclosure to enable one skilled in the art to understand or practice the disclosure. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the disclosure. Thus, the present disclosure is not intended to be limited to the embodiments shown and described herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (6)
1. The display method of the power factor of the generator in the DCS system is characterized in that the DCS system comprises an analog signal input unit and a control unit; a power factor transmitter is arranged at the generator and is connected with an analog signal input unit of the DCS system; the method comprises the following steps:
receiving an analog current signal output by a power factor transmitter of a generator;
when the current value of the analog current signal is determined to be smaller than or equal to a preset current value, determining a first power factor corresponding to the current value of the analog current signal based on a first linear function and displaying the first power factor; the first linear function is determined in advance based on current values of a plurality of first analog current signals output by the power factor transmitter and corresponding power factors;
when the current value of the analog current signal is determined to be larger than the preset current value, determining a second power factor corresponding to the current value of the analog current signal based on a second linear function and displaying the second power factor; the second linear function is determined in advance based on current values of a plurality of second analog current signals output by the power factor transmitter and corresponding power factors, wherein the current values of the plurality of second analog current signals are different from the current values of the plurality of first analog current signals;
the current value of the analog current signal output by the generator power factor transmitter comprises an upper limit current value and a lower limit current value, and the preset current value is the sum of the lower limit current value and a specified current value; wherein the specified current value is one half of a difference between the upper limit current value and the lower limit current value; the straight line represented by the first linear function is intersected with the straight line represented by the second linear function, and the abscissa corresponding to the intersection point is the preset current value;
when the power factor displayed in the DCS system is determined to be beyond the preset power factor range, the control unit issues a control instruction to a generator controller so that the generator controller controls and adjusts the rotating speed of the generator; the generator controller comprises a PID controller, the PID controller obtains the current rotating speed of the generator, and the rotating speed of the generator is controlled and regulated based on the current rotating speed and the set rotating speed.
2. The method of claim 1, wherein a current value of each of the first analog current signals is less than or equal to the preset current value, and a current value of each of the second analog current signals is greater than the preset current value.
3. The method of claim 2, wherein the first linear function is determined in advance based on current values of a plurality of first analog current signals output by the power factor transmitter and a corresponding power factor fit for each of the first analog current signals.
4. The method of claim 2, wherein the second linear function is determined in advance based on current values of a plurality of second analog current signals output by the power factor transmitter and a corresponding power factor fit for each of the second analog current signals.
5. The method according to any one of claims 1 to 4, wherein the power factor transmitter is connected to an analog signal input unit of the DCS system through a signal line, and an electromagnetic wave shielding layer is provided on an outer surface of the signal line.
6. The display system of the generator power factor in the DCS system is characterized in that the DCS system comprises an analog signal input unit and a control unit; a power factor transmitter is arranged at the generator and is connected with an analog signal input unit of the DCS system; the system comprises:
the receiving module is used for receiving an analog current signal output by the power factor transmitter of the generator;
the first display module is used for determining a first power factor corresponding to the current value of the analog current signal based on a first linear function and displaying the first power factor when the current value of the analog current signal is smaller than or equal to a preset current value; the first linear function is determined in advance based on current values of a plurality of first analog current signals output by the power factor transmitter and corresponding power factors;
the second display module is used for determining a second power factor corresponding to the current value of the analog current signal based on a second linear function and displaying the second power factor when the current value of the analog current signal is determined to be larger than the preset current value; the second linear function is determined in advance based on current values of a plurality of second analog current signals output by the power factor transmitter and corresponding power factors, wherein the current values of the plurality of second analog current signals are different from the current values of the plurality of first analog current signals; the current value of the analog current signal output by the generator power factor transmitter comprises an upper limit current value and a lower limit current value, and the preset current value is the sum of the lower limit current value and a specified current value; wherein the specified current value is one half of a difference between the upper limit current value and the lower limit current value; the straight line represented by the first linear function is intersected with the straight line represented by the second linear function, and the abscissa corresponding to the intersection point is the preset current value;
the control unit is used for sending a control instruction to the generator controller when the power factor displayed in the DCS system exceeds the preset power factor range so that the generator controller controls and adjusts the rotating speed of the generator; the generator controller comprises a PID controller, the PID controller obtains the current rotating speed of the generator, and the rotating speed of the generator is controlled and regulated based on the current rotating speed and the set rotating speed.
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| GB2498884B (en) * | 2009-04-16 | 2014-02-12 | Panoramic Power Ltd | Apparatus and methods thereof for power consumption measurement at circuit breaker points |
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| DE10357788A1 (en) * | 2003-03-10 | 2004-09-23 | Mitsubishi Denki K.K. | Converter device with a circuit that improves the power factor |
| CN102353834A (en) * | 2011-07-08 | 2012-02-15 | 贵州电力试验研究院 | Method for displaying generator power factor in DCS (Data Communication System) |
| CN113933705A (en) * | 2021-09-26 | 2022-01-14 | 西门子电站自动化有限公司 | System for monitoring an electric motor |
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