Diesel generator load monitoring, regulation and control operation method and system

Abstract

The invention belongs to the technical field of generator systems, and particularly discloses a diesel generator load monitoring, regulation and control operation method and system, and the method comprises the following steps: S1, obtaining a vibration signal and a thermal imaging signal of each generator in a generator cluster, determining the aging condition of each generator according to the vibration signal and the thermal imaging signal of the generator; s2, determining the expected load capacity corresponding to the generator based on the aging condition of the generator; s3, determining the actual load capacity based on the aging condition of the generator; s4, correcting the actual load capacity by using the expected load capacity; s5, collecting current, voltage and power in the power supply line, and determining a real-time overall line load value; and S6, determining to start a plurality of generators according to the real-time load value. By adopting the technical scheme, the actual load capacity of the generator is determined, the proper number of generators are started, and energy conservation and emission reduction are facilitated.

Description

Technical Field

[0001] The invention belongs to the technical field of generator systems, and relates to a method and system for load monitoring and regulating operation of a diesel generator. Background Art

[0002] Diesel generator overload refers to the situation where the power provided by the generator exceeds its rated power. Overload can cause the following problems: Generator temperature rise: When overloaded, the load inside the generator is too large, causing the motor operating temperature to rise sharply, which may damage the internal coils and other components; Voltage instability: When overloaded, the generator may not be able to maintain a stable output voltage, resulting in unstable power supply; Increased fuel consumption: When operating at overload, diesel generators require more fuel to maintain operation, which may result in reduced fuel efficiency; Generator damage: Long-term overload operation will shorten the service life of the diesel generator and may even cause damage to components such as the stator and rotor of the generator; Avoiding diesel generator overload is the key to ensuring its long-term normal operation and extended service life.

[0003] Generally, large industrial enterprises or factories, large digital centers, large hospitals, airports, large commercial complexes, stadiums or conference centers usually have huge electricity demands and need to be equipped with multiple generators to meet the power needs during power outages.

[0004] During a power outage, a certain number of generators need to be turned on to meet the power demand. If too few generators are turned on, it may easily lead to generator overload; if too many generators are turned on, it will be detrimental to energy conservation and emission reduction. How to determine the actual load capacity of the generator and turn on the appropriate number of generators is a technical problem that needs to be solved. Summary of the invention

[0005] The object of the present invention is to provide a method and system for monitoring and controlling the operation of a diesel generator load, so as to solve the problem of how to determine the actual load capacity of the generator and start an appropriate number of generators.

[0006] In order to achieve the above object, the basic scheme of the present invention is: a diesel generator load monitoring and control operation method, comprising the following steps: S1, obtaining the vibration signal and thermal imaging signal of each generator in the generator cluster, and determining the aging condition of each generator based on the vibration signal and thermal imaging signal of the generator; S2, based on the aging condition of the generator, determining the expected load capacity corresponding to the generator; S3, determining the actual load capacity based on the aging of the generator; S4, using the expected load capacity, corrects the actual load capacity; S5, collecting the current, voltage and power in the power supply line to determine the real-time overall line load value; S6, determining how many generators to start based on the real-time overall line load value.

[0007] The working principle and beneficial effect of this basic solution are: this technical solution determines the aging of the generator based on the operation of the generator, and then determines the actual load capacity of the generator and makes corrections, so that the data obtained is more accurate. Based on the load capacity of the generator and the real-time overall line load value, it ensures that the number of generators turned on is appropriate to ensure that the power demand is met and prevent the generator from being overloaded, which is conducive to energy saving and emission reduction.

[0008] Further, in step S1, the aging condition of each generator is determined based on the vibration signal and thermal imaging signal of the generator, as follows: , in, represents the aging index of the i-th generator, , , is the weight coefficient, which indicates the influence of vibration, average temperature and temperature fluctuation on aging, obtained through experimental data. is the RMS value of the vibration signal of the i-th generator at time t, indicating the degree of mechanical wear; is the average value of the temperature signal of the i-th generator at time t, reflecting the thermal load of the equipment; is the temperature fluctuation of the i-th generator running to time t, indicating the stability of the equipment during operation.

[0009] The aging condition of each generator is determined based on the vibration signal and thermal imaging signal of the generator, which is beneficial for subsequent use.

[0010] Further, in step S2, based on the aging condition of the generator, the expected load capacity corresponding to the generator is determined, specifically: , in, is the expected load capacity of the generator at time t during the aging process; is the load capacity of the new generator, that is, the maximum load capacity when it is not aged; is the aging index of the i-th generator; It is the aging rate coefficient, which indicates the degree of influence of aging on load capacity and is obtained by fitting experimental data or historical data.

[0011] Based on the aging condition of the generator, the expected load capacity corresponding to the generator is determined so as to make subsequent load capacity corrections.

[0012] Further, in step S3, based on the aging condition of the generator, the actual load capacity is determined as: , in, is the actual load capacity of the ith generator, is the nominal load capacity of the ith generator, is the nominal efficiency of the ith generator, is the temperature rise value of the i-th generator, is the safe working threshold of the i-th generator, is the nominal power of the i-th generator; is the efficiency loss of the ith generator: , in, is the efficiency of the i-th generator before aging, is the efficiency of the i-th generator at time t, where the efficiency is the output power divided by the input power; is the mechanical loss power of the i-th generator at time t: , in, , , , The factors that influence mechanical loss are current, speed, working time and vibration, which can be obtained through experiments; is the current of the i-th generator at time t, n is the speed, is the working time of the i-th generator at time t, is the vibration intensity of the i-th generator at time t.

[0013] Based on the aging of the generator, determine the actual load capacity.

[0014] Furthermore, in step S4, the method for correcting the actual load capacity by using the expected load capacity is: , in, is the actual load capacity of the i-th generator; is the expected load capacity of the generator at time t during the aging process; ε is the decay rate, and t represents the time.

[0015] The expected load capacity is used to correct the actual load capacity to obtain more accurate load capacity data.

[0016] Furthermore, if the power supply line is out of power, the number of generators to be started is determined based on the real-time overall line load value. The specific steps are as follows: S61, sorting the corrected actual load capacities of all generators from low to high; S62, starting from the generator with the lowest actual load capacity, calculating the number of generators when the sum of the actual load capacities reaches the overall line load value and starting them; S63, real-time monitoring of load changes; S64, when there is an increase and the power supply capacity of the already started generators is exceeded, the generators are started in order from the highest actual load capacity to the lowest until the load requirements are met; When there is a decrease, it is determined whether the decrease value is higher than the generator with the lowest actual load capacity. If higher, the lowest generator is turned off and the process returns to step S63.

[0017] If the power supply line is out of power, the output power of multiple generators can be adjusted based on the overall line load value collected when the power is not out, and the power and number of generators can be flexibly adjusted to meet the power demand. In case of emergency power supply, the generator with the lowest actual load capacity is started first, which is conducive to the replacement of generators; when there is a load fluctuation, the generators are started in order from the highest actual load capacity to the lowest, which is conducive to maintaining the stability of the circuit.

[0018] The present invention also provides a diesel generator load monitoring and control operation system, including a data acquisition module and a processing module, wherein the data acquisition module is used to collect vibration signals and thermal imaging signals of each generator in the generator cluster, as well as current, voltage and power information in the power supply line; The input end of the processing module is connected to the output end of the data acquisition module, and the processing module executes the method of the present invention to control the start-up of a plurality of generators.

[0019] The system uses data acquisition modules and processing modules to determine the actual load capacity of the generator and start the appropriate number of generators to meet the power demand. Instruction Manual

[0020] Figure 1 It is a flow chart of the diesel generator load monitoring and control operation method of the present invention. DETAILED DESCRIPTION

[0021] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0022] In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicating orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0023] In the description of the present invention, unless otherwise specified and limited, it should be noted that the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a mechanical connection or an electrical connection, or it can be the internal connection between two components. It can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to the specific circumstances.

[0024] The present invention discloses a method for monitoring and controlling the operation of a diesel generator load, which determines the actual load capacity of the generator and starts an appropriate number of generators to meet the power demand, while preventing the generator from being overloaded, which is beneficial to energy saving and emission reduction. Figure 1 As shown, the diesel generator load monitoring and control operation method includes the following steps: S1, obtain the vibration signal (such as using a vibration sensor to collect signals) and thermal imaging signal (using an infrared thermal imager to collect signals) of each generator in the generator cluster. The specific vibration sensor can be set on the base or bearing of the generator, and the thermal imager can be set directly at the key parts of the generator, such as the stator, rotor, brush, bearing and cooling system. The aging condition of each generator is determined based on the vibration signal and thermal imaging signal of the generator; S2, based on the aging condition of the generator, determining the expected load capacity corresponding to the generator; S3, determining the actual load capacity based on the aging of the generator; S4, using the expected load capacity, corrects the actual load capacity; S5, collecting the current, voltage and power in the power supply line (such as using a current sensor, a voltage sensor, a power sensor, etc., and the specific connection method adopts a common connection method in the field), and determining the real-time overall line load value; S6, determining how many generators to start based on the real-time overall line load value.

[0025] In a preferred embodiment of the present invention, in step S1, the aging condition of each generator is determined based on the vibration signal and thermal imaging signal of the generator, as follows: , in, represents the aging index of the i-th generator, , , is the weight coefficient, which indicates the influence of vibration, average temperature and temperature fluctuation on aging, obtained through experimental data. is the root mean square value of the vibration signal of the i-th generator at time t (for example, the temperature of the key parts such as the stator, rotor, brush, bearing and cooling system is collected and the root mean square value is taken), indicating the degree of mechanical wear; is the average value of the temperature signal of the i-th generator at time t, reflecting the thermal load of the equipment; is the temperature fluctuation of the ith generator from running to time t (the maximum temperature fluctuation of the key parts), indicating the stability of the equipment during operation.

[0026] In a preferred embodiment of the present invention, in step S2, based on the aging condition of the generator, the expected load capacity corresponding to the generator is determined, specifically: , in, is the expected load capacity of the generator at time t during the aging process; is the load capacity of the new generator, that is, the maximum load capacity when it is not aged; is the aging index of the i-th generator; It is the aging rate coefficient, which indicates the degree of influence of aging on load capacity and is obtained by fitting experimental data or historical data.

[0027] In a preferred embodiment of the present invention, in step S3, based on the aging condition of the generator, the actual load capacity is determined as: , in, is the actual load capacity of the ith generator, is the nominal load capacity of the ith generator, is the nominal efficiency of the ith generator, is the temperature rise value of the i-th generator, is the safe working threshold of the i-th generator, is the nominal power of the i-th generator; is the efficiency loss of the ith generator: , in, is the efficiency of the i-th generator before aging, is the efficiency of the i-th generator at time t, where the efficiency is the output power divided by the input power; is the mechanical loss power of the i-th generator at time t: , in, , , , The factors that influence mechanical loss are current, speed, working time and vibration, which can be obtained through experiments; is the current of the i-th generator at time t, n is the speed, is the working time of the i-th generator at time t, is the vibration intensity of the i-th generator at time t.

[0028] In a preferred embodiment of the present invention, the method for correcting the actual load capacity by using the expected load capacity in step S4 is: , in, is the actual load capacity of the i-th generator; is the expected load capacity of the generator at time t during the aging process; ε is the decay rate, and t represents the time.

[0029] In a preferred embodiment of the present invention, if the power supply line is out of power, according to the real-time overall line load value (according to the overall line load value collected when there is no power outage, for example, a power meter or power meter can be set at the main incoming line of the power consumption site to collect the load value of the entire line), it is determined how many generators to start. The specific steps are as follows: S61, sorting the corrected actual load capacities of all generators from low to high; S62, starting from the generator with the lowest actual load capacity, calculating the number of generators when the sum of the actual load capacities reaches the overall line load value and starting them; S63, real-time monitoring of load changes; S64, when there is an increase and the power supply capacity of the already started generators is exceeded, the generators are started in order from the highest actual load capacity to the lowest until the load requirements are met; When there is a decrease, it is determined whether the decrease value is higher than the generator with the lowest actual load capacity. If higher, the lowest generator is turned off and the process returns to step S63.

[0030] The present invention also provides a diesel generator load monitoring and control operation system, including a data acquisition module and a processing module. The data acquisition module is used to collect vibration signals and thermal imaging signals of each generator in the generator cluster, as well as current, voltage and power information in the power supply line.

[0031] The input end of the processing module is electrically connected to the output end of the data acquisition module, and the processing module executes the method of the present invention to control the start-up of a plurality of generators.

[0032] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0033] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A diesel generator load monitoring and control operation method, characterized in that: The steps include: S1, obtaining the vibration signal and thermal imaging signal of each generator in the generator cluster, and determining the aging condition of each generator based on the vibration signal and thermal imaging signal of the generator; S2, based on the aging condition of the generator, determining the expected load capacity corresponding to the generator; S3, determining the actual load capacity based on the aging of the generator; S4, using the expected load capacity, corrects the actual load capacity; S5, collecting the current, voltage and power in the power supply line to determine the real-time overall line load value; S6, determining how many generators to start based on the real-time overall line load value.

2. The diesel generator load monitoring and control operation method according to claim 1, characterized in that: In step S1, the aging condition of each generator is determined based on the vibration signal and thermal imaging signal of the generator, as follows: ， in, represents the aging index of the i-th generator, , , is the weight coefficient, which indicates the influence of vibration, average temperature and temperature fluctuation on aging, obtained through experimental data. is the RMS value of the vibration signal of the i-th generator at time t, indicating the degree of mechanical wear; is the average value of the temperature signal of the i-th generator at time t, reflecting the thermal load of the equipment; is the temperature fluctuation of the i-th generator running to time t, indicating the stability of the equipment during operation.

3. The diesel generator load monitoring and control operation method according to claim 1, characterized in that: In step S2, based on the aging condition of the generator, the expected load capacity corresponding to the generator is determined, specifically: , in, is the expected load capacity of the generator at time t during the aging process; is the load capacity of the new generator, that is, the maximum load capacity when it is not aged; is the aging index of the i-th generator; It is the aging rate coefficient, which indicates the degree of influence of aging on load capacity and is obtained by fitting experimental data or historical data.

4. The diesel generator load monitoring and control operation method according to claim 1, characterized in that: In step S3, based on the aging condition of the generator, the actual load capacity is determined as: , in, is the actual load capacity of the ith generator, is the nominal load capacity of the ith generator, is the nominal efficiency of the ith generator, is the temperature rise value of the i-th generator, is the safe working threshold of the i-th generator, is the nominal power of the i-th generator; is the efficiency loss of the ith generator: , in, is the efficiency of the i-th generator before aging, is the efficiency of the i-th generator at time t, where the efficiency is the output power divided by the input power; is the mechanical loss power of the i-th generator at time t: , in, , , , The factors that influence mechanical loss are current, speed, working time and vibration, which can be obtained through experiments; is the current of the i-th generator at time t, n is the speed, is the working time of the i-th generator at time t, is the vibration intensity of the i-th generator at time t.

5. The diesel generator load monitoring and control operation method according to claim 1, characterized in that: In step S4, the method for correcting the actual load capacity by using the expected load capacity is: ， in, is the actual load capacity of the i-th generator; is the expected load capacity of the generator at time t during the aging process; ε is the decay rate, and t represents the time.

6. The diesel generator load monitoring and control operation method according to claim 1, characterized in that: If the power supply line is out of power, determine how many generators to start based on the real-time overall line load value. The specific steps are as follows: S61, sorting the corrected actual load capacities of all generators from low to high; S62, starting from the generator with the lowest actual load capacity, calculating the number of generators when the sum of the actual load capacities reaches the overall line load value and starting them; S63, real-time monitoring of load changes; S64, when there is an increase and the power supply capacity of the already started generators is exceeded, the generators are started in order from the highest actual load capacity to the lowest until the load requirements are met; When there is a decrease, it is determined whether the decrease value is higher than the generator with the lowest actual load capacity. If higher, the lowest generator is turned off and the process returns to step S63.

7. A diesel generator load monitoring and control operation system, characterized in that: It includes a data acquisition module and a processing module, wherein the data acquisition module is used to collect vibration signals and thermal imaging signals of each generator in the generator cluster, as well as current, voltage and power information in the power supply line; The input end of the processing module is connected to the output end of the data acquisition module, and the processing module executes the method described in any one of claims 1-6 to control the start-up of a plurality of generators.

Images