Reactive power compensation method for coal mine power supply system

Abstract

The present invention relates to the technical field of reactive power compensation for power supply systems, and in particular to a reactive power compensation method for a coal mine power supply system. The reactive power compensation method for a coal mine power supply system is applied to a coal mine power supply system, and comprises the following steps: drawing a reactive power curve of a loop to be optimized; drawing an ideal compensation curve on the basis of the reactive power curve and active power; and formulating a compensation strategy on the basis of the ideal compensation curve. Optimization of reactive power compensation for the coal mine power supply system is achieved.

Description

A reactive compensation method for coal mine power supply system Technical Field

[0001] The present invention relates to the technical field of reactive power compensation for power supply systems, and in particular to a reactive power compensation method for a coal mine power supply system. Background Art

[0002] Underground coal mines have dispersed loads, primarily mobile transformers and electric motors. This results in a low power factor during operation, resulting in significant line and voltage losses, often leading to difficulties in electric starting. Reactive power compensation is an effective technical means of improving the power factor of power supply systems and reducing voltage and line losses.

[0003] Some coal mines have installed centralized reactive power compensation equipment on the ground 10kV (6kV) busbars, and some coal mines have also installed flameproof reactive power compensation equipment sporadically underground. Although reactive power compensation equipment has been installed, it is unknown whether the installation location and number of reactive power compensation equipment are the best or optimal strategy. There may be too many reactive power compensation devices, resulting in high costs, or too few reactive power compensation devices, which cannot meet the corresponding reactive power compensation effect. In other words, the existing technology has not yet achieved a method to optimize reactive power compensation. Summary of the Invention

[0004] The purpose of the present invention is to provide a reactive power compensation method for a coal mine power supply system, so as to solve the problem of reactive power compensation optimization of the coal mine power supply system.

[0005] An embodiment of the present invention provides a reactive power compensation method for a coal mine power supply system, which is applied to a coal mine power supply system. The method includes the following steps:

[0006] Draw the reactive power curve of the circuit to be optimized;

[0007] Drawing an ideal compensation curve according to the reactive power curve and the active power;

[0008] A compensation strategy is formulated according to the ideal compensation curve.

[0009] Optionally, before the step of drawing the reactive power curve of the loop to be optimized, the following steps are included:

[0010] Periodically acquiring active power and reactive power of the power supply system;

[0011] Determining the circuit to be optimized according to the active power and the reactive power;

[0012] The preset period is less than 1 hour.

[0013] Optionally, determining the circuit to be optimized based on the active power and the reactive power includes the following steps:

[0014] Calculating daily active energy and daily reactive energy based on the active energy and the reactive energy;

[0015] The daily active power is the daily average value of the active power in a year, and the daily reactive power is the daily average value of the reactive power in a year.

[0016] Optionally, determining the circuit to be optimized based on the active power and the reactive power further includes the following steps:

[0017] Calculating a first power factor according to the daily active power and the daily reactive power;

[0018] Obtaining average active power according to the active power;

[0019] Determining whether the first power factor in the circuit is lower than a first preset power factor, and whether the average active power of the circuit in a typical day is greater than a preset active power; if so, determining that the circuit is the circuit to be optimized;

[0020] The typical day is the day with the largest daily active power in the circuit within a year.

[0021] Optionally, the calculation formula for the first power factor includes:

[0022] ;

[0023] in, is the first power factor; Wh is the daily active energy; var is the daily reactive energy.

[0024] Optionally, drawing the reactive power curve of the loop to be optimized includes the following steps:

[0025] Periodically obtain reactive power;

[0026] Drawing the reactive power curve of the circuit to be optimized on the typical day according to the reactive power;

[0027] The horizontal coordinate of the reactive power curve is time, and the vertical coordinate of the reactive power curve is reactive power value.

[0028] Optionally, drawing an ideal compensation curve according to the reactive power curve and the active power curve comprises the following steps:

[0029] The ideal compensation curve is drawn in a step-like shape, and the ordinates of the coordinate points of the ideal compensation curve are not higher than the ordinates of the coordinate points of the reactive power curve.

[0030] Optionally, the step of drawing an ideal compensation curve according to the reactive power curve and the active power curve further includes the following steps:

[0031] Periodically obtaining the active power;

[0032] Calculating the difference between the ordinate of the coordinate point of the ideal compensation curve and the ordinate of the coordinate point of the reactive power curve;

[0033] Calculating a second power factor according to the difference and the active power;

[0034] It is determined whether the second power factor is greater than or equal to a second preset power factor. If so, the ideal compensation curve meets the reactive power compensation requirement.

[0035] Optionally, the calculation formula for the second power factor includes:

[0036] ;

[0037] Wherein, COS is the second power factor; P is the active power; is the difference.

[0038] Optionally, formulating a compensation strategy according to the ideal compensation curve includes the following steps:

[0039] Determining the number of compensation capacitor groups according to the number of gradient changes of the ideal compensation curve;

[0040] The compensation capacity of the compensation capacitor group is determined according to the gradient change value of the ideal compensation curve.

[0041] Compared with the prior art, the reactive power compensation method for a coal mine power supply system provided by the present invention has the following beneficial effects:

[0042] The reactive power compensation method for a coal mine power supply system provided in an embodiment of the present invention draws a reactive power curve of the circuit to be optimized and determines the reactive power change of the circuit to be optimized; draws an ideal compensation curve based on the reactive power curve and the active power to facilitate the subsequent formulation of a compensation strategy; formulates a compensation strategy based on the ideal compensation curve to achieve reactive compensation optimization of the coal mine power supply system, and achieves optimal reactive regulation of the entire power supply system by installing the least amount of reactive compensation equipment with the most appropriate capacity. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0044] FIG1 is a schematic flow chart of a reactive power compensation method for a coal mine power supply system according to an embodiment of the present invention;

[0045] FIG2 is a schematic diagram of a circuit to be optimized including a reactive power curve, an ideal compensation orientation, and a reactive power curve after compensation in an embodiment of the present invention. DETAILED DESCRIPTION

[0046] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0047] An embodiment of the present invention provides a method for reactive power compensation in a coal mine power supply system, which is applied to the coal mine power supply system. The method includes the following steps:

[0048] S110, drawing a reactive power curve of the circuit to be optimized;

[0049] S120, drawing an ideal compensation curve based on the reactive power curve and the active power curve;

[0050] S130: Develop a compensation strategy based on the ideal compensation curve.

[0051] The reactive power compensation method for a coal mine power supply system provided by an embodiment of the present invention draws a reactive power curve of the circuit to be optimized and determines the reactive power change of the circuit to be optimized; draws an ideal compensation curve based on the reactive power curve and the active power to provide a basis for the subsequent formulation of a compensation strategy; formulates a compensation strategy based on the ideal compensation curve, determines the number and location of reactive compensation equipment, and purchases and deploys reactive compensation equipment, which avoids unnecessary investment in reactive compensation equipment and achieves the best power factor of the coal mine power supply system, thereby realizing reactive compensation optimization of the coal mine power supply system.

[0052] In the embodiment of the present invention, before the above step S110, the following steps are included:

[0053] S140, periodically obtaining active power and reactive power of the power supply system;

[0054] S150, determining a circuit to be optimized based on active power and reactive power;

[0055] The preset period is less than 1 hour.

[0056] In this way, the active power and reactive power of the power supply system are periodically acquired so that the circuit to be optimized can be determined based on the active power and reactive power.

[0057] It should be noted that the preset period can be a period value less than 1 hour, such as 5 minutes, 15 minutes, 30 minutes, etc., and the preferred value is 5 minutes.

[0058] In the embodiment of the present invention, the above step S150 includes the following sub-steps:

[0059] S1502, calculating daily active power and daily reactive power based on active power and reactive power;

[0060] The daily active energy is the daily average value of active energy in a year, and the daily reactive energy is the daily average value of reactive energy in a year.

[0061] In this way, the daily active energy and the daily reactive energy are calculated based on the active energy and the reactive energy, which facilitates the subsequent calculation of the first power factor.

[0062] It should be noted that the hourly average active energy, daily average active energy, monthly average active energy and annual average active energy can be calculated based on the active energy and reactive energy.

[0063] In the embodiment of the present invention, the above step S114 further includes the following sub-steps:

[0064] S1504, calculating a first power factor based on the daily active power and the daily reactive power;

[0065] S1506, obtaining average active power according to the active power;

[0066] S1508, determining whether the first power factor in the circuit is lower than a first preset power factor, and whether the average active power of the circuit in a typical day is greater than a preset active power; if so, determining that the circuit is a circuit to be optimized;

[0067] The typical day is the day with the largest daily active energy in the circuit in a year.

[0068] In this way, the first power factor is calculated based on the daily active power and daily reactive power; the average active power is obtained based on the active power; and the circuit that needs to be optimized is determined by judging whether the daily average power factor in the circuit is lower than the preset power factor and whether the average value of the typical daily active power in the circuit is greater than the preset active power.

[0069] In an embodiment of the present invention, the calculation formula for the first power factor includes:

[0070] ;

[0071] in, is the first power factor; Wh is the daily active power; var is the daily reactive power.

[0072] In this way, a method for calculating a first power factor is provided to obtain the first power factor by calculation.

[0073] In the embodiment of the present invention, the above step S110 includes the following sub-steps:

[0074] S112, periodically obtaining reactive power;

[0075] S114, drawing a reactive power curve of the circuit to be optimized on a typical day based on the reactive power;

[0076] The horizontal axis of the reactive power curve is time, and the vertical axis of the reactive power curve is the reactive power value.

[0077] In this way, a specific method for drawing a reactive power curve is provided to achieve accurate and comprehensive drawing of a typical daily reactive power curve.

[0078] In the embodiment of the present invention, the above step S120 includes the following sub-steps:

[0079] S1202: Draw an ideal compensation curve in a step-like shape, and the vertical coordinates of the coordinate points of the ideal compensation curve are not higher than the vertical coordinates of the coordinate points of the reactive power curve.

[0080] In this way, a method for drawing an ideal compensation curve is provided, in which the ideal compensation curve is drawn in a stepped shape and the vertical coordinates of the coordinate points of the ideal compensation curve are not higher than the vertical coordinates of the coordinate points of the reactive power curve, so as to facilitate the subsequent formulation of compensation strategies and determine the minimum number of capacitor groups.

[0081] In the embodiment of the present invention, the above step S120 further includes the following sub-steps:

[0082] S1204, periodically obtaining active power;

[0083] S1206, calculating the difference between the ordinate of the coordinate point of the ideal compensation curve and the ordinate of the coordinate point of the reactive power curve;

[0084] S1208, calculating a second power factor based on the difference and the active power;

[0085] S1210: Determine whether the second power factor is greater than or equal to a second preset power factor. If so, the ideal compensation curve meets the reactive power compensation requirement.

[0086] In this way, active power is periodically obtained; the difference between the ordinate of the coordinate point of the ideal compensation curve and the ordinate of the coordinate point of the reactive power curve is calculated; the second power factor is calculated based on the difference and the active power; it is judged whether the second power factor is greater than or equal to the second preset power factor, and whether the ideal compensation curve meets the reactive compensation requirements, thereby obtaining the capacitance group capacity that meets the reactive compensation requirements.

[0087] Exemplarily, the second preset power factor may be set to a value not less than 0.95 to obtain a better reactive power compensation effect.

[0088] In the embodiment of the present invention, the calculation formula of the second power factor includes:

[0089] ;

[0090] Wherein, COS is the second power factor; P is the active power; is the difference.

[0091] Thus, a method for calculating the second power factor is provided to obtain the second power factor by calculation.

[0092] In the embodiment of the present invention, the above step S130 includes the following sub-steps:

[0093] S1302, determining the number of compensation capacitor groups according to the number of gradient changes of the ideal compensation curve;

[0094] S1304: Determine the compensation capacity of the compensation capacitor group according to the gradient change value of the ideal compensation curve.

[0095] In this way, a specific method for formulating a compensation strategy is provided to achieve reactive compensation optimization of the circuit, so as to achieve optimal reactive regulation of the entire power supply system by installing the least reactive compensation equipment with the most appropriate capacity.

[0096] The following further describes the system structure and usage method of the embodiment of the present invention in conjunction with the accompanying drawings:

[0097] Exemplarily, as shown in Figure 2, according to the reactive power curve, the ideal compensation curve is drawn in a stepped shape and the ordinates of the coordinate points of the ideal compensation curve are not higher than the ordinates of the coordinate points of the reactive power curve. By judging whether the second power factor is greater than or equal to the second preset power factor, the ordinate value of the curve segment of the ideal compensation curve parallel to the horizontal axis is determined, and then the maximum compensation capacity is determined to be 400kvar; according to the number of gradient changes of the ideal compensation curve, it is determined that the compensated capacitor group can be divided into three groups; according to the ordinate values ​​of each curve segment of the ideal compensation curve parallel to the horizontal axis, it is determined that two groups of capacitors are 100kvar and one group is 200kvar. According to the reactive power curve and the ideal compensation curve, the compensated reactive power curve is obtained. The maximum value of the above-mentioned reactive power curve after compensation is less than 100kvar, and it can be judged that the compensation optimization effect is met.

[0098] Of course, those skilled in the art will understand that all or part of the processes in the above-mentioned embodiment methods can be implemented by instructing the control device through a computer program, and the program can be stored in a computer-readable storage medium. When the program is executed, it may include the processes of the above-mentioned method embodiments, wherein the storage medium may be a memory, a disk, an optical disk, etc.

[0099] Finally, it should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article, or device comprising the element.

[0100] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0101] Although the present invention is disclosed as above, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be based on the scope defined by the claims.

Claims

1. A reactive power compensation method for a coal mine power supply system, characterized in that: Applied to a coal mine power supply system, the method comprises the following steps: Draw the reactive power curve of the circuit to be optimized; Draw an ideal compensation curve according to the reactive power curve and the active power; A compensation strategy is formulated according to the ideal compensation curve.

2. The reactive power compensation method for coal mine power supply system according to claim 1, characterized in that: Before the step of drawing the reactive power curve of the loop to be optimized, the following steps are included: Periodically acquiring active power and reactive power of the power supply system; Determining the circuit to be optimized according to the active power and the reactive power; The preset period is less than 1 hour.

3. The reactive power compensation method for coal mine power supply system according to claim 2, characterized in that: Determining the circuit to be optimized according to the active power and the reactive power comprises the following steps: Calculate the daily active power and the daily reactive power according to the active power and the reactive power; The daily active power is the daily average value of the active power in a year, and the daily reactive power is the daily average value of the reactive power in a year.

4. The reactive power compensation method for coal mine power supply system according to claim 3, characterized in that: Determining the circuit to be optimized according to the active power and the reactive power also includes the following steps: Calculating a first power factor according to the daily active power and the daily reactive power; According to the active power, average active power is obtained; Determine whether the first power factor in the loop is lower than a first preset power factor, and whether the average active power of the loop in a typical day is greater than a preset active power, and if so, determine that the loop is the loop to be optimized; The typical day is the date with the largest daily active power in the circuit within a year.

5. The reactive power compensation method for coal mine power supply system according to claim 4, characterized in that: The calculation formula of the first power factor includes: ； in, is the first power factor; Wh is the daily active power; var is the daily reactive power.

6. The reactive power compensation method for coal mine power supply system according to claim 4, characterized in that: The step of drawing the reactive power curve of the loop to be optimized comprises the following steps: Periodically obtain reactive power; According to the reactive power, drawing the reactive power curve of the circuit to be optimized on the typical day; The horizontal coordinate of the reactive power curve is time, and the vertical coordinate of the reactive power curve is reactive power value.

7. The reactive power compensation method for coal mine power supply system according to claim 1, characterized in that: Drawing an ideal compensation curve according to the reactive power curve and the active power comprises the following steps: The ideal compensation curve is drawn in a step-like shape, and the ordinates of the coordinate points of the ideal compensation curve are not higher than the ordinates of the coordinate points of the reactive power curve.

8. The reactive power compensation method for coal mine power supply system according to claim 7, characterized in that: The method of drawing an ideal compensation curve according to the reactive power curve and the active power also includes the following steps: Periodically acquiring the active power; Calculate the difference between the ordinate of the coordinate point of the ideal compensation curve and the ordinate of the coordinate point of the reactive power curve; Calculating a second power factor according to the difference and the active power; It is determined whether the second power factor is greater than or equal to a second preset power factor. If so, the ideal compensation curve meets the reactive power compensation requirement.

9. The reactive power compensation method for coal mine power supply system according to claim 8, characterized in that: The calculation formula of the second power factor includes: ； Wherein, COS is the second power factor; P is the active power; is the difference.

10. The reactive power compensation method for coal mine power supply system according to claim 7, characterized in that: The method of formulating a compensation strategy according to the ideal compensation curve comprises the following steps: Determining the number of compensation capacitor groups according to the number of gradient changes of the ideal compensation curve; The compensation capacity of the compensation capacitor group is determined according to the gradient change value of the ideal compensation curve.

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