Reactive compensation method for coal mine power supply system

Abstract

The present invention relates to the technical field of reactive compensation in electricity supply systems, and more particularly to a reactive compensation method for coal mine power supply systems. This reactive compensation method for coal mine power supply systems is used in coal mine power supply systems and includes the following steps: plotting a reactive power curve of a circuit to be optimized; plotting an ideal compensation curve according to the reactive power curve and active power; and formulating a compensation strategy according to the ideal compensation curve to achieve the optimization of reactive compensation for coal mine power supply systems.

Description

[Technical Field]

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

[0002] The load inside a coal mine is distributed, and there are many transformer and motor loads, which results in a low power factor during operation, large line losses, and large voltage losses, making it difficult to start the motor. Reactive compensation is an effective technical means to increase the power factor of the power supply system, reduce voltage losses, and reduce line losses.

[0003] Some coal mines have installed centralized reactive compensation equipment on aboveground 10kV (6kV) busbars, while some have installed explosion-proof reactive compensation equipment in a decentralized manner inside the mine.Although reactive compensation equipment is installed, it is unclear whether the installation location and number of reactive compensation equipment are appropriate, and whether an optimal strategy is being adopted.There are problems such as too much reactive compensation equipment being costly, and too little equipment not providing the corresponding reactive compensation effect.In other words, there is a problem that the conventional technology does not have a way to achieve optimized reactive compensation. Summary of the Invention [Problem to be solved by the invention]

[0004] The objective of the present invention is to provide a reactive compensation method for a coal mine power supply system to solve the optimization problem of reactive compensation for the coal mine power supply system. [Means for solving the problem]

[0005] An embodiment of the present invention provides a reactive compensation method for a coal mine power supply system, which is used in the coal mine power supply system, and the method includes the following steps: Draw the reactive power curve of the circuit to be optimized. An ideal compensation curve is drawn based on the reactive power curve and the active power curve. A compensation strategy is formulated based on the ideal compensation curve.

[0006] Optionally, the step of drawing a reactive power curve of the circuit to be optimized includes the following steps before the step of drawing a reactive power curve of the circuit to be optimized. The active power and reactive power of the power supply system are periodically acquired. The circuit to be optimized is determined based on the amount of active power and the amount of reactive power. Here, the preset period is a period value less than one hour.

[0007] Optionally, determining said circuit to optimize based on said amount of active power and said amount of reactive power comprises: The daily active energy and the daily reactive energy are calculated based on the active energy and the reactive energy. Here, the daily active energy is the average value of the active energy per day over a year, and the daily reactive energy is the average value of the reactive energy per day over a year.

[0008] Optionally, determining the circuit to optimize based on the amount of active power and the amount of reactive power further comprises: A first power factor is calculated based on the daily active energy and the daily reactive energy. An average active power amount is obtained based on the active power amount.

[0009] Determine whether the first power factor in the circuit is lower than a first preset power factor, and determine whether the average active power amount in the circuit on a typical day is greater than the preset active power amount, and if so, determine that the electric circuit is the circuit to be optimized. Here, the typical day is the day on which the amount of daily active power in the circuit is the largest within one year.

[0010] Optionally, a formula for calculating the first power factor includes:

number

[0011] Optionally, drawing a reactive power curve of the circuit to be optimized comprises the steps of: The reactive power is periodically acquired. The reactive power curve of the circuit to be optimized on the typical day is drawn based on the reactive power. Here, the abscissa of the reactive power curve is time, and the ordinate of the reactive power curve is the reactive power value.

[0012] Optionally, said drawing an ideal compensation curve based on said reactive power curve and active power comprises the steps of: The ideal compensation curve is drawn in a stepped manner, and the ordinate of a coordinate point of the ideal compensation curve is not higher than the ordinate of a coordinate point of the reactive power curve.

[0013] Optionally, drawing an ideal compensation curve based on said reactive power curve and active power further comprises the steps of: The active power is periodically acquired. 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. A second power factor is calculated based on the difference and the active power. Determine whether the second power factor is greater than or equal to a second preset power factor, and if so, the ideal compensation curve can meet reactive compensation requirements.

[0014] Optionally, the formula for calculating the second power factor includes:

number

[0015] Optionally, said formulating a compensation strategy based on said ideal compensation curve comprises the steps of: The number of compensation capacitor groups is determined based on the number of gradient changes of the ideal compensation curve. The compensation capacitance of the compensation capacitor group is determined based on the gradient change value of the ideal compensation curve. [Effects of the Invention]

[0016] Compared with the prior art, the reactive compensation method for coal mine power supply system provided by the present invention has the following advantageous effects:

[0017] The reactive compensation method for a coal mine power supply system provided by an embodiment of the present invention determines the change in reactive power of the circuit to be optimized by drawing a reactive power curve of the circuit to be optimized, and then draws an ideal compensation curve based on the reactive power curve and active power, which is convenient for formulating a compensation strategy.The compensation strategy is formulated based on the ideal compensation curve to realize the optimization of reactive compensation for the coal mine power supply system, and the minimum number of reactive compensation equipment with the most appropriate capacity can be installed to achieve the optimal reactive power adjustment of the entire power supply system. [Brief explanation of the drawings]

[0018] In order to more clearly describe the embodiments of the present invention or the technical solutions of the prior art, the following will briefly introduce the drawings necessary for describing the embodiments or the prior art. Obviously, the drawings used in the following description are only embodiments of the present invention, and those skilled in the art can obtain other drawings from the drawings provided in this description without creative work. [Figure 1] FIG. 1 is a schematic flow chart of a reactive compensation method for a coal mine power supply system according to an embodiment of the present invention. [Figure 2] FIG. 2 is a schematic diagram of a circuit to be optimized in an embodiment of the present invention, including a reactive power curve, an ideal compensation orientation, and a compensated reactive power curve. DETAILED DESCRIPTION OF THE INVENTION

[0019] In order to make the above-mentioned objects, features and advantages of the present invention more clear, specific embodiments of the present invention will be described in detail below in conjunction with the drawings.

[0020] An embodiment of the present invention provides a reactive compensation method for a coal mine power supply system, which is applied to the coal mine power supply system, and includes the following steps: S110, drawing a reactive power curve of the circuit to be optimized; S120, drawing an ideal compensation curve based on the reactive power curve and the active power curve. S130, drawing a compensation strategy based on the ideal compensation curve;

[0021] The reactive compensation method for a coal mine power supply system provided by an embodiment of the present invention determines the change in reactive power of the circuit to be optimized by drawing a reactive power curve of the circuit to be optimized, and then draws an ideal compensation curve based on the reactive power curve and active power, providing a basis for formulating a compensation strategy.The compensation strategy is formulated based on the ideal compensation curve to determine the number and location of reactive compensation equipment, and reactive compensation equipment is purchased and installed accordingly, which not only eliminates the need for additional investment in reactive compensation equipment but also achieves the effect of optimizing the power factor of the coal mine power supply system and further realizes the optimization of reactive compensation for the coal mine power supply system.

[0022] The embodiment of the present invention includes the following steps before the above step S110. S140, obtaining the active energy and reactive energy of the power supply system; S150, determining a circuit to be optimized based on the amount of active power and the amount of reactive power. Here, the preset period is a period value less than one hour.

[0023] In this way, the amount of active power and the amount of reactive power of the power supply system are periodically acquired, and a circuit to be optimized is determined based on the amount of active power and the amount of reactive power. Here, the preset period may be a period value less than one hour, such as 5 minutes, 15 minutes, or 30 minutes, and is preferably 5 minutes.

[0024] In an embodiment of the present invention, step S150 includes the following substeps: S1502, calculate the daily active energy and the daily reactive energy based on the active energy and the reactive energy. Here, the daily active energy is the average value of the active energy per day over a year, and the daily reactive energy is the average value of the reactive energy per day over a year.

[0025] As described above, the daily active energy and the daily reactive energy are calculated based on the active energy and the daily reactive energy, which makes it easier to calculate the first power factor later. Here, it is explained that the average active energy per hour, average active energy per day, average active energy per month, and average active energy per year can be calculated based on the active energy and reactive energy.

[0026] In an embodiment of the present invention, step S114 further includes the following sub-steps: S1504, calculating a first power factor based on the daily active energy and the daily reactive energy. S1506, obtain an average active power amount based on the active power amount. S1508, determining whether the first power factor in the circuit is lower than a first preset power factor, and determining whether the average active power amount in a typical day in the circuit is greater than the preset active power amount, and if so, determining that the electric circuit is a circuit to be optimized. Here, a typical day is a day on which the amount of daily active power in a circuit is the largest within a year.

[0027] As described above, the first power factor is calculated based on the daily active energy and the daily reactive energy, the average active energy is obtained based on the active energy, and the circuit to be optimized is determined by determining whether the daily average power factor in the circuit is lower than the preset power factor and whether the average active energy on a typical day in the circuit is greater than the preset active energy.

[0028] In an embodiment of the present invention, the calculation formula of the first power factor includes:

number

[0029] As described above, a calculation method for the first power factor is provided, and the first power factor is calculated based on the method.

[0030] In an embodiment of the present invention, step S110 includes the following substeps: S112, periodically obtain reactive power; S114, drawing a reactive power curve of the circuit to be optimized on a typical day based on the reactive power; Here, the abscissa of the reactive power curve is time, and the ordinate of the reactive power curve is the reactive power value.

[0031] As described above, a specific method for plotting a reactive power curve is provided to realize accurate and comprehensive plotting of a typical day reactive power curve.

[0032] In an embodiment of the present invention, step S120 includes the following sub-steps: S1202, the ideal compensation curve is drawn in a stepped manner, and the ordinate of the coordinate point of the ideal compensation curve is not higher than the ordinate of the coordinate point of the reactive power curve.

[0033] As described above, a method for drawing an ideal compensation curve is provided, in which the ideal compensation curve is drawn in a stepped manner, and the ordinate of the coordinate point of the ideal compensation curve is not higher than the ordinate of the coordinate point of the reactive power curve. This facilitates the formulation of the subsequent compensation strategy and determines the minimum number of capacitor groups.

[0034] In an embodiment of the present invention, step S120 further includes the following sub-steps: S1204, periodically obtain the active power. S1206, calculate the difference between the ordinate of the coordinate point on the ideal compensation curve and the ordinate of the coordinate point on the reactive power curve. S1208, calculating a second power factor based on the difference and the active power. S1210, determining whether the second power factor is greater than or equal to the second preset power factor, and if so, the ideal compensation curve can meet the reactive compensation requirement;

[0035] As described above, the active power is periodically obtained, the difference between the ordinate of the coordinate point on the ideal compensation curve and the ordinate of the coordinate point on the reactive power curve is calculated, the second power factor is calculated based on the difference and the active power, whether the second power factor is greater than or equal to the second preset power factor is determined, whether the ideal compensation curve meets the reactive compensation requirement is determined, and the capacity of the capacitor group that meets the reactive compensation requirement is further obtained.

[0036] For example, in order to achieve a more favorable reactive compensation effect, the second preset power factor may be set to 0.95 or more.

[0037] In an embodiment of the present invention, the calculation formula of the second power factor includes:

number

[0038] As described above, a calculation method for the second power factor is provided, and the second power factor is calculated based on the method.

[0039] In an embodiment of the present invention, step S130 includes the following sub-steps: S1302, determining the number of compensation capacitor groups based on the number of gradient changes of the ideal compensation curve; S1304, determining the compensation capacitance of the compensation capacitor group based on the gradient change value of the ideal compensation curve.

[0040] As described above, a specific method for compensation strategy is provided, the reactive compensation of the circuit is optimized, and the reactive compensation equipment with the minimum number and the most appropriate capacity is installed to achieve the optimal reactive adjustment of the entire power supply system.

[0041] The system structure and usage method of the embodiment of the present invention will be further described below in conjunction with the drawings.

[0042] For example, as shown in FIG. 2, an ideal compensation curve is drawn in a stepped manner based on the reactive power curve, and the ordinate of the coordinate point of the ideal compensation curve is not higher than the ordinate of the coordinate point of the reactive power curve. By determining 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 abscissa axis is determined, and the maximum compensation capacity is determined to be 400 kvar. Based on the number of slope changes of the ideal compensation curve, it is determined that the capacitor groups to be compensated are divided into three groups. Based on the ordinate value of each curve segment of the ideal compensation curve parallel to the abscissa axis, two groups of capacitors are determined to be 100 kvar, and one group is determined to be 200 kvar. A compensated reactive power curve is obtained based on the reactive power curve and the ideal compensation curve. If the maximum value of the compensated reactive power curve is less than 100 kvar, it is determined that the optimization effect of compensation is achieved.

[0043] Those skilled in the art should understand that the processes for realizing all or part of the methods of the above embodiments can be completed by sending commands to a control device via a computer program, which can be stored in a computer-readable storage medium, and which can include the processes of the above embodiments when executed, and which can be a memory, a magnetic disk, an optical disk, etc.

[0044] It should be explained that relational terms such as "first" and "second," etc., are used herein only to distinguish one entity or operation from another, and do not necessarily require or imply that such an actual relationship or order exists between those entities or operations. Furthermore, the terms "comprise," "comprises," or any other variant thereof are intended to cover the non-exclusive inclusion of a process, method, article, or device that includes a set of elements, including not only those elements but also other elements not expressly listed or inherent in such process, method, article, or device. Absent further limitations, an element defined by the phrase "comprises one ..." does not exclude the presence of other identical elements in a process, method, article, or device that includes that element.

[0045] Each embodiment in this specification is described in a sequential manner, emphasizing the differences between each embodiment and other embodiments, and the same and similar parts of each embodiment can be referenced.

[0046] Although the present invention has been disclosed as above, the present invention is not limited thereto. Those skilled in the art may make various changes and modifications without departing from the spirit or scope of the present invention, and the scope defined by the claims is the scope of protection of the present invention.

Claims

1. A reactive compensation method for a coal mine power supply system, which is used in the coal mine power supply system, the reactive compensation method comprising the following steps: Draw the reactive power curve of the circuit to be optimized, Draw an ideal compensation curve based on the reactive power curve and the active power; Formulating a compensation strategy based on the ideal compensation curve; Drawing an ideal compensation curve based on the reactive power curve and the active power includes the following steps: The ideal compensation curve is drawn in a stepped manner, and The ordinate of the coordinate point of the ideal compensation curve is not higher than the ordinate of the coordinate point of the reactive power curve; Active power is acquired periodically, 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; calculating a second power factor based on the difference and the active power; Determining whether the second power factor is greater than or equal to a second preset power factor, and if so, the ideal compensation curve can meet reactive compensation requirements; Formulating a compensation strategy based on the ideal compensation curve includes the steps of: determining the number of compensation capacitor groups based on the number of gradient changes of the ideal compensation curve; The reactive compensation method for a coal mine power supply system further comprises determining the compensation capacitance of the compensation capacitor group based on a gradient change value of the ideal compensation curve.

2. before the step of drawing a reactive power curve of the circuit to be optimized, The active and reactive energy of the power supply system are periodically acquired at preset intervals, determining the circuit to be optimized based on the amount of active power and the amount of reactive power; wherein the preset period is a value less than one hour; Determining the circuit to optimize based on the amount of active power and the amount of reactive power includes: Calculating a daily active energy amount and a daily reactive energy amount based on the active energy amount and the reactive energy amount; Here, the daily active energy is an average value of the active energy per day over a one-year period, The daily reactive power amount is an average value of the reactive power amount per day for one year, Determining a circuit to optimize based on the amount of active power and the amount of reactive power further includes the steps of: Calculating a first power factor based on the daily active energy and the daily reactive energy; obtaining an average active power amount based on the active power amount; determining whether the first power factor in the circuit is less than a first preset power factor; and Determining whether the average active power amount in a typical day in a circuit is greater than a preset active power amount, and if so, determining that the electric circuit is the circuit to be optimized; 2. The reactive compensation method for a coal mine power supply system according to claim 1, wherein the typical day is a day on which the amount of daily active power in the circuit is the largest within one year.

3. The calculation formula of the first power factor includes: [Equation 1] Here, COS p 3. The reactive compensation method for a coal mine power supply system according to claim 2, wherein: Wh is the first power factor, Wh is the daily active energy, and var is the daily reactive energy.

4. Drawing a reactive power curve of a circuit to be optimized comprises the steps of: Periodically acquire reactive power, Draw the reactive power curve of the circuit to be optimized on the typical day based on the reactive power; 3. The reactive compensation method for a coal mine power supply system according to claim 2, wherein the abscissa of the reactive power curve is time, and the ordinate of the reactive power curve is reactive power value.

5. The calculation formula for the second power factor includes: [Equation 2] 2. The reactive compensation method for a coal mine power supply system according to claim 1, wherein COS is the second power factor, P is the active power, and ΔQ is the difference.

Images