System for monitoring stability of power system in coal mine area

Abstract

The invention provides a coal mine area electric power system stability monitoring system, relates to the technical field of electric power system monitoring, and aims to obtain accurate and reliable electric power system stability monitoring through a simple and easy-to-arrange monitoring system and simple data processing. The acquisition module is used for acquiring an output voltage sequential sequence and an output current sequential sequence of a power system; the equipment monitoring module is used for acquiring a working voltage sequential sequence, a working current sequential sequence and a working temperature sequential sequence of each piece of equipment in the power system; the first stability judgment module is used for judging the output stability of the power system; the second stability judgment module is used for judging the power stability of the equipment; and the comprehensive stability judgment module is used for judging the stability of the power system. The method has the advantages that monitoring facilities are simple, calculation is simple and reliable, and the method can be conveniently applied to coal mine areas with complex terrains and equipment.

Description

Technical Field

[0001] The present invention relates to the technical field of power system monitoring, and in particular to a coal mining area power system stability monitoring system. Background Art

[0002] Coal mining areas are important places for energy production. Their production equipment and operating environment have extremely high requirements for the stability of the power system. The power system in coal mining areas needs to provide reliable power supply for mining equipment, lifting equipment, ventilation equipment, drainage equipment and other key infrastructure.

[0003] However, due to the special geographical location of the coal mining area, the complex power supply structure and the use of high-power load equipment, the power system faces a series of stability challenges, so it is necessary to monitor the stability of the power system in the coal mining area. However, due to the special geographical location of the coal mining area and other conditions, the power system monitoring in the site is also limited in terms of equipment layout and computing device layout.

[0004] Therefore, a stability monitoring method for the power system in coal mining areas is needed to achieve accurate and reliable power system stability monitoring through a simple and easy-to-layout monitoring system and simple data processing. Summary of the invention

[0005] The object of the present invention is to provide a coal mining area power system stability monitoring system, which can achieve accurate and reliable power system stability monitoring through a simple and easy-to-layout monitoring system and simple data processing.

[0006] The object of the present invention is to provide a coal mining area power system stability monitoring system, which can achieve accurate and reliable power system stability monitoring through a simple and easy-to-layout monitoring system and simple data processing.

[0007] The present invention is achieved through the following technical solutions

[0008] A coal mine area power system stability monitoring system, characterized by comprising:

[0009] A power system monitoring module, used for obtaining an output voltage timing sequence and an output current timing sequence of the power system;

[0010] An equipment monitoring module, used for obtaining the working voltage timing sequence, working current timing sequence and working temperature timing sequence of each equipment in the power system;

[0011] A first stability judgment module, used to judge the output stability of the power system according to the monitoring result of the power system monitoring module, and obtain the output stability parameter of the power system;

[0012] A second stability judgment module is used to judge the power stability of the equipment according to the monitoring result of the equipment monitoring module to obtain the comprehensive stability parameter of the equipment;

[0013] The comprehensive stability judgment module is used to judge the stability of the power system according to the output stability parameters of the power system and the comprehensive stability parameters of the equipment.

[0014] Preferably, the method for determining the output stability of the power system according to the monitoring result of the power system monitoring module is:

[0015] The power system output stability parameter is obtained according to the fluctuation of the output voltage and the fluctuation of the output current.

[0016] Preferably, the output voltage fluctuation The method to obtain is:

[0017]

[0018] in, is the value of the ith element in the output voltage timing sequence of the power system, N is the total number of elements in the output voltage timing sequence, v th,sys is the reference output voltage of the system;

[0019] The output current fluctuation The method to obtain is:

[0020]

[0021] in, is the value of the ith element in the output current time series of the power system, N is the total number of elements in the output current time series, and p th,sys is the reference output power of the system;

[0022] The power system output stability parameter st out The method to obtain is:

[0023]

[0024] Preferably, the method for determining the power stability of the device according to the monitoring result of the device monitoring module is:

[0025] The comprehensive stability parameter of the device is obtained according to the fluctuation of the working temperature, the fluctuation of the working voltage and the fluctuation of the working current of the device.

[0026] Preferably, the method for obtaining the fluctuation of the operating temperature of the device is:

[0027]

[0028] in, represents the fluctuation of the operating temperature of the jth device, temp j,i is the value of the ith element in the operating temperature timing sequence of the jth device, M is the total number of elements in the operating temperature timing sequence of the jth device, t j,1 and t j,2 are the lower and upper limits of the empirical threshold interval of the operating temperature of the jth device, respectively, and max(.,.) is the maximum function;

[0029] The method for obtaining the fluctuation of the working voltage of the device is:

[0030]

[0031] in, represents the fluctuation of the working voltage of the jth device, is the value of the ith element in the operating voltage timing sequence of the jth device, v th,j is the reference output voltage of the jth device;

[0032] The method for obtaining the fluctuation of the current and voltage of the device is:

[0033]

[0034] in, represents the fluctuation of the working current of the jth device, is the value of the ith element in the working current timing sequence of the jth device, p th,j is the reference output power of the jth device.

[0035] Preferably, the comprehensive stability parameter st of the acquisition device eq,all The method is:

[0036]

[0037] Among them, st eq,j is the stability parameter of the Jth device, J is the total number of devices;

[0038]

[0039] Among them, γ j and α j are the weights of the j-th device respectively.

[0040] Preferably, the weight α of the j-th device j The method to determine is:

[0041] Obtain the power of the jth device in various working modes respectively;

[0042] Get the power variance Var of the jth device in multiple working modes j =var(p k,j ,k=1,2,…),p k,j represents the power of the jth device in the kth working mode, var(.) is the function for finding the variance;

[0043] Get the weight α j :

[0044]

[0045] Among them, e is a natural constant;

[0046] The weight γ of the jth device j The method for determining is:

[0047]

[0048] Among them, A is the intermediate parameter.

[0049] Preferably, the method for determining the stability of the power system according to the power system output stability parameter and the comprehensive stability parameter of the equipment is:

[0050] Get the comprehensive stability parameter st of the power system sys :

[0051] st sys =π1*st out +π2*st eq,all ;

[0052]

[0053] π2=1-π1;

[0054] Among them, st out Output stability parameters of the power system, st eq,all is the comprehensive stability parameter of the device, π1 and π2 are weights, and e is a natural constant;

[0055] If the comprehensive stability parameter of the power system exceeds a preset standard threshold, an early warning is issued.

[0056] Preferably, when the comprehensive stability parameter of the power system exceeds a preset standard threshold, it is determined whether the source of power instability is the power system output or the equipment based on the values ​​of the power system output stability parameter and the comprehensive stability parameter of the equipment.

[0057] The technical solution of the present invention has at least the following advantages and beneficial effects:

[0058] The present invention collects key parameters of the power system and each device through the power system monitoring module and the equipment monitoring module, and can provide comprehensive information on the operating status of the system and the equipment, which helps to obtain accurate and reliable power system stability analysis results;

[0059] The present invention comprehensively considers the stability of both the power system and the equipment. When the stability parameters of the power system or the equipment are abnormal, the system can quickly warn, and can more comprehensively evaluate the health status of the power system to reduce misjudgment or missed judgment;

[0060] After the present invention determines the existence of instability through comprehensive parameters, it can judge the stability of the power system and equipment based on process parameters, thereby clarifying the source of the stability problem and improving the problem location capability;

[0061] The present invention can be easily constructed and applied to coal mining areas with various levels of terrain complexity and equipment complexity while monitoring as little data as possible through simple monitoring equipment and with a simple calculation process, and at the same time realizes reliable and stable power system monitoring. BRIEF DESCRIPTION OF THE DRAWINGS

[0062] Figure 1 A schematic diagram of the principle of a coal mining area power system stability monitoring system provided in Example 1 of the present invention. DETAILED DESCRIPTION

[0063] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0064] Example 1

[0065] This embodiment provides a coal mining area power system stability monitoring system, see Figure 1 ,include:

[0066] A power system monitoring module, used for obtaining an output voltage timing sequence and an output current timing sequence of the power system;

[0067] An equipment monitoring module, used for obtaining the working voltage timing sequence, working current timing sequence and working temperature timing sequence of each equipment in the power system;

[0068] A first stability judgment module, used to judge the output stability of the power system according to the monitoring result of the power system monitoring module, and obtain the output stability parameter of the power system;

[0069] A second stability judgment module is used to judge the power stability of the equipment according to the monitoring result of the equipment monitoring module to obtain the comprehensive stability parameter of the equipment;

[0070] The comprehensive stability judgment module is used to judge the stability of the power system according to the output stability parameters of the power system and the comprehensive stability parameters of the equipment.

[0071] This embodiment collects key parameters of the power system and each device through the power system monitoring module and the equipment monitoring module, including the power system output voltage, output current, and the equipment's operating voltage, operating current, and operating temperature and other time series data, covering the global state of the power system operation and the local state of the equipment operation, which helps to fully reflect the operation of the power system and equipment through data processing, and then obtain accurate and reliable power system stability analysis results. Since the required data is streamlined, the corresponding monitoring device is also simple and easy to layout, and the data processing process does not need to rely on high-performance equipment, so this system can be well set up in coal mining areas with various complex terrains, and conduct power monitoring for systems composed of various equipment.

[0072] In this embodiment, the method for determining the output stability of the power system according to the monitoring result of the power system monitoring module is:

[0073] The power system output stability parameter is obtained according to the fluctuation of the output voltage and the fluctuation of the output current.

[0074] Furthermore, the fluctuation of the output voltage The method to obtain is:

[0075]

[0076] in, is the value of the ith element in the output voltage timing sequence of the power system, B is the total number of elements in the output voltage timing sequence, v th,sys is the reference output voltage of the system;

[0077] The output current fluctuation The method to obtain is:

[0078]

[0079] in, is the value of the ith element in the output current time series of the power system, N is the total number of elements in the output current time series, and p th,sys is the reference output power of the system;

[0080] The power system output stability parameter st out The method to obtain is:

[0081]

[0082] On the other hand, the method for determining the power stability of the device according to the monitoring result of the device monitoring module is:

[0083] The comprehensive stability parameter of the device is obtained according to the fluctuation of the working temperature, the fluctuation of the working voltage and the fluctuation of the working current of the device.

[0084] Wherein, the method for obtaining the fluctuation of the working temperature of the device is:

[0085]

[0086] in, represents the fluctuation of the operating temperature of the jth device, temp j,i is the value of the ith element in the operating temperature timing sequence of the jth device, M is the total number of elements in the operating temperature timing sequence of the jth device, t j,1 and t j,2 are the lower and upper limits of the empirical threshold interval of the operating temperature of the jth device, respectively, and max(.,.) is the maximum function;

[0087] The method for obtaining the fluctuation of the working voltage of the device is:

[0088]

[0089] in, represents the fluctuation of the working voltage of the jth device, is the value of the ith element in the operating voltage timing sequence of the jth device, v th,j is the reference output voltage of the jth device;

[0090] The method for obtaining the fluctuation of the current and voltage of the device is:

[0091]

[0092] in, represents the fluctuation of the working current of the jth device, is the value of the ith element in the working current timing sequence of the jth device, p th,j is the reference output power of the jth device.

[0093] Then, the comprehensive stability parameter st of the acquisition device is eq,all The method is preferably:

[0094]

[0095] Among them, steq,j is the stability parameter of the jth device, J is the total number of devices;

[0096]

[0097] Among them, γ j and α j are the weights of the j-th device respectively.

[0098] Specifically, the weight α of the j-th device j The preferred method for determining is:

[0099] Obtain the power of the jth device in various working modes respectively;

[0100] Get the power variance Var of the jth device in multiple working modes j =var(p k,j ,k=1,2,…),p k,j represents the power of the jth device in the kth working mode, var(.) is the function for finding the variance;

[0101] Get the weight α j :

[0102]

[0103] Among them, e is a natural constant;

[0104] The weight γ of the jth device j The method for determining is:

[0105]

[0106]

[0107] Among them, A is the intermediate parameter.

[0108] When extracting fluctuation characteristics of the output of the power system and the operating data of the equipment, this embodiment not only considers the fluctuation of the data itself, but also refers to the deviation from the standard data, thereby improving the accuracy of data stability. At the same time, when monitoring the stability of the equipment itself, the data deviation caused by the different power of the equipment itself under different working conditions is considered, and the corresponding weight is adjusted accordingly. For equipment whose power is more affected by the working state and nature, when calculating its comprehensive stability parameters, the weight of the parameter fluctuation calculated by relying on the reference output power will be lower. The specific weight is determined by measuring the power fluctuation degree of the equipment under different working conditions.

[0109] Finally, the method for judging the stability of the power system according to the power system output stability parameter and the comprehensive stability parameter of the equipment is:

[0110] Get the comprehensive stability parameter st of the power system sys :

[0111] st sys =π1*st out +π2*st eq,all ;

[0112]

[0113] π2=1-π1;

[0114] Among them, st out Output stability parameters of the power system, st eq,all is the comprehensive stability parameter of the device, π1 and π2 are weights, and e is a natural constant;

[0115] If the comprehensive stability parameter of the power system exceeds a preset standard threshold, an early warning is issued.

[0116] As a preferred solution of this embodiment, when the power system comprehensive stability parameter exceeds a preset standard threshold, the power instability source is determined to be the power system output or the device according to the values ​​of the power system output stability parameter and the comprehensive stability parameter of the device. Specifically, the process parameters may be returned to view, such as the stability parameter of each device, the comprehensive stability parameter of the device, and the power system output stability parameter.

[0117] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A coal mining area power system stability monitoring system, characterized in that: include: A power system monitoring module, used for obtaining an output voltage timing sequence and an output current timing sequence of the power system; An equipment monitoring module, used for obtaining the working voltage timing sequence, working current timing sequence and working temperature timing sequence of each equipment in the power system; A first stability judgment module, used to judge the output stability of the power system according to the monitoring result of the power system monitoring module, and obtain the output stability parameter of the power system; A second stability judgment module is used to judge the power stability of the equipment according to the monitoring result of the equipment monitoring module to obtain the comprehensive stability parameter of the equipment; The comprehensive stability judgment module is used to judge the stability of the power system according to the output stability parameters of the power system and the comprehensive stability parameters of the equipment.

2. A coal mine power system stability monitoring system according to claim 1, characterized in that: The method for judging the output stability of the power system according to the monitoring results of the power system monitoring module is: The power system output stability parameter is obtained according to the fluctuation of the output voltage and the fluctuation of the output current.

3. A coal mine power system stability monitoring system according to claim 2, characterized in that: The output voltage fluctuation The method to obtain is: in, is the value of the ith element in the output voltage timing sequence of the power system, N is the total number of elements in the output voltage timing sequence, v th,sys is the reference output voltage of the system; The output current fluctuation The method to obtain is: in, is the value of the ith element in the output current time series of the power system, N is the total number of elements in the output current time series, and p th,sys is the reference output power of the system; The power system output stability parameter st out The method to obtain is:

4. A coal mine power system stability monitoring system according to claim 1, characterized in that: The method for determining the power stability of the equipment according to the monitoring result of the equipment monitoring module is as follows: The comprehensive stability parameter of the device is obtained according to the fluctuation of the working temperature, the fluctuation of the working voltage and the fluctuation of the working current of the device.

5. A coal mine power system stability monitoring system according to claim 4, characterized in that: The method for obtaining the fluctuation of the working temperature of the device is: in, represents the fluctuation of the operating temperature of the jth device, temp j,i is the value of the ith element in the operating temperature timing sequence of the jth device, M is the total number of elements in the operating temperature timing sequence of the jth device, t j,1 and t j,2 are the lower and upper limits of the empirical threshold interval of the operating temperature of the jth device, respectively, and max(.,.) is the maximum function; The method for obtaining the fluctuation of the working voltage of the device is: in, represents the fluctuation of the working voltage of the jth device, is the value of the ith element in the operating voltage timing sequence of the jth device, v th,j is the reference output voltage of the jth device; The method for obtaining the fluctuation of the current and voltage of the device is: in, represents the fluctuation of the working current of the jth device, is the value of the ith element in the working current timing sequence of the jth device, p th,j is the reference output power of the jth device.

6. A coal mine power system stability monitoring system according to claim 5, characterized in that: The comprehensive stability parameter st of the acquisition device eq,all The method is: Among them, st eq,j is the stability parameter of the jth device, J is the total number of devices; Among them, γ j and α j are the weights of the j-th device respectively.

7. A coal mine power system stability monitoring system according to claim 6, characterized in that: The weight α of the jth device j The method for determining is: Obtain the power of the jth device in various working modes respectively; Get the power variance Var of the jth device in multiple working modes j =var(p k,j ,k=1,2,…),p k,j represents the power of the jth device in the kth working mode, var(.) is the function for finding the variance; Get the weight α j : Among them, e is a natural constant; The weight γ of the jth device j The method to determine is: Among them, A is the intermediate parameter.

8. A coal mine power system stability monitoring system according to claim 1, characterized in that: The method for determining the stability of the power system according to the power system output stability parameter and the comprehensive stability parameter of the equipment is as follows: Get the comprehensive stability parameter st of the power system sys : st sys =π1*st out +π2*st eq,all ; π2＝1-π1； Among them, st out Output stability parameters of the power system, st eq,all is the comprehensive stability parameter of the device, π1 and π2 are weights, and e is a natural constant; If the comprehensive stability parameter of the power system exceeds a preset standard threshold, an early warning is issued.

9. A coal mine power system stability monitoring system according to claim 8, characterized in that: When the comprehensive stability parameter of the power system exceeds a preset standard threshold, it is determined whether the source of power instability is the power system output or the equipment based on the values ​​of the power system output stability parameter and the comprehensive stability parameter of the equipment.

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