CN111641360A - Method, device, equipment and medium for obtaining transient voltage drop and starting equipment - Google Patents

Method, device, equipment and medium for obtaining transient voltage drop and starting equipment Download PDF

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Publication number
CN111641360A
CN111641360A CN202010531236.3A CN202010531236A CN111641360A CN 111641360 A CN111641360 A CN 111641360A CN 202010531236 A CN202010531236 A CN 202010531236A CN 111641360 A CN111641360 A CN 111641360A
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voltage drop
generator
transient voltage
starting
preset rule
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CN111641360B (en
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刘红霞
田庆明
王关龙
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Shanghai Waigaoqiao Shipbuilding Co Ltd
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Shanghai Waigaoqiao Shipbuilding Co Ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P9/00—Arrangements for controlling electric generators for the purpose of obtaining a desired output
    • H02P9/10—Control effected upon generator excitation circuit to reduce harmful effects of overloads or transients, e.g. sudden application of load, sudden removal of load, sudden change of load
    • H02P9/105—Control effected upon generator excitation circuit to reduce harmful effects of overloads or transients, e.g. sudden application of load, sudden removal of load, sudden change of load for increasing the stability
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
    • H02J3/14—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by switching loads on to, or off from, network, e.g. progressively balanced loading
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P9/00—Arrangements for controlling electric generators for the purpose of obtaining a desired output
    • H02P9/08—Control of generator circuit during starting or stopping of driving means, e.g. for initiating excitation
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P9/00—Arrangements for controlling electric generators for the purpose of obtaining a desired output
    • H02P9/10—Control effected upon generator excitation circuit to reduce harmful effects of overloads or transients, e.g. sudden application of load, sudden removal of load, sudden change of load
    • H02P9/102—Control effected upon generator excitation circuit to reduce harmful effects of overloads or transients, e.g. sudden application of load, sudden removal of load, sudden change of load for limiting effects of transients
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
    • Y02B70/3225—Demand response systems, e.g. load shedding, peak shaving
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
    • Y04S20/20—End-user application control systems
    • Y04S20/222—Demand response systems, e.g. load shedding, peak shaving

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  • Power Engineering (AREA)
  • Supply And Distribution Of Alternating Current (AREA)

Abstract

The invention discloses a method, a device, equipment and a medium for acquiring transient voltage drop and starting equipment. The acquisition method comprises the following steps: acquiring basic information of a generator and operation data of a motor; acquiring a preset rule of transient voltage drop calculation; and calculating the transient voltage drop of the generator according to the preset rule based on the basic information and the operation data. The invention overcomes the defects of time and labor waste and low accuracy caused by calculating the transient voltage drop of the generator by using an empirical formula in the prior art.

Description

Method, device, equipment and medium for obtaining transient voltage drop and starting equipment
Technical Field
The invention relates to the field of transient voltage drop calculation, in particular to a method, a device, equipment and a medium for acquiring transient voltage drop and starting equipment.
Background
In marine and oceanographic engineering projects, alternators are largely used as main power sources. When the load is suddenly increased, voltage fluctuation of the generator is caused, and transient voltage drop of the generator needs to be calculated in a design stage. The fluctuation characteristic of the voltage of the generator is fully considered, the voltage fluctuation characteristic of the system is within an allowable range, and adverse effects on the overall operation of the power grid are avoided or reduced as much as possible.
The current method for calculating the transient pressure drop has no uniform standard, the calculation formulas are different, the calculation results are different, and the manual calculation is complex. Usually by empirical formula calculation, requiring multiple parameter adjustments and iterative calculations. Because the difference of the calculation results of different formulas is large, the calculation results need to be compared and analyzed, and the accuracy of the final result of the final transient pressure drop is low.
Disclosure of Invention
The invention provides a method, a device, equipment and a medium for acquiring transient voltage drop and starting equipment, and aims to overcome the defect of low accuracy of calculating the transient voltage drop of a generator by an empirical formula in the prior art.
The invention solves the technical problems through the following technical scheme:
in a first aspect, the present invention provides a method for obtaining a transient voltage drop of a generator, where the method includes the following steps:
acquiring basic information of a generator and operation data of a motor; the basic information comprises the model, the parallel connection quantity and the load starting mode of the generator;
acquiring a preset rule of transient voltage drop calculation;
calculating the transient voltage drop of the generator according to the preset rule based on the basic information and the operation data;
the preset rules comprise a first preset rule, a second preset rule and a third preset rule, wherein the first preset rule and the second preset rule represent transient voltage drop calculation rules when a single generator operates in a network, and the third preset rule represents transient voltage drop calculation rules when one or more generators operate in the network.
Preferably, the first preset rule is obtained by the following formula:
Figure BDA0002535286430000021
wherein Δ U represents the generator transient voltage drop, UGRepresenting the rated voltage, U, of the generatorMRepresenting the rated voltage of the motor, INRepresenting the rated current of the generator, IsTRepresents a starting current x 'at the time of direct start of the motor'dRepresents the generator direct axis transient reactance, x ″)dRepresenting the direct-axis sub-transient reactance of the generator, and d representing a step-down starting coefficient.
Preferably, the second preset rule is obtained by the following formula:
ΔU＝x′d/(Sg/LoadkVA+x′d)×100％
wherein, delta U represents the transient voltage drop of the generator, Sg represents the rated power of the generator, LoadkVA represents the load starting power of the generator, x'dRepresenting the generator direct axis transient reactance.
Preferably, the third preset rule is obtained by the following formula:
Figure BDA0002535286430000022
wherein Δ U represents the generator transient voltage drop, IsTRepresents the starting current at the time of direct start of the motor, IgRepresenting the rated current, x 'of the generator'dRepresenting the transient reactance of the direct axis of the generator, N representing the number of the generators on the net,
Figure BDA0002535286430000023
represents a power factor at the time of start of the motor,
Figure BDA0002535286430000024
representing the power factor angle.
Preferably, the calculating the transient voltage drop of the generator according to the preset rule based on the basic information and the operation data includes:
judging the parallel connection quantity of the generators;
if the number of the parallel connection is multiple, determining the transient voltage drop of the generator by utilizing the third preset rule;
and/or the presence of a gas in the gas,
if the number of the parallel connections is single, calculating by using the first preset rule, the second preset rule and the third preset rule to obtain a first transient voltage drop, a second transient voltage drop and a third transient voltage drop of the generator;
determining a transient voltage drop of the generator based on the first transient voltage drop, the second transient voltage drop, and the third transient voltage drop of the generator.
In a second aspect, the present invention provides a starting method of a power plant, including the steps of:
calculating the transient voltage drop of the generator in the power equipment to be detected by using the method for acquiring the transient voltage drop of the generator in the first aspect;
comparing the transient voltage drop with a preset transient voltage drop threshold;
if the transient voltage drop is larger than the transient voltage drop threshold value, determining the starting mode of the power equipment to be detected as voltage reduction starting or soft starting;
and if the transient voltage drop is smaller than the transient voltage drop threshold value, determining the starting mode of the power equipment to be detected as direct starting.
In a third aspect, the present invention provides a device for obtaining transient voltage drop of a generator, where the device includes:
the first acquisition module is used for acquiring basic information of the generator and operation data of the motor; the basic information comprises the model, the parallel connection quantity and the load starting mode of the generator;
the second acquisition module is used for acquiring a preset rule of transient voltage drop calculation;
the voltage drop acquisition module is used for calculating the transient voltage drop of the generator according to the preset rule based on the basic information and the operation data;
the preset rules comprise a first preset rule, a second preset rule and a third preset rule, wherein the first preset rule and the second preset rule represent transient voltage drop calculation rules when a single generator operates in a network, and the third preset rule represents transient voltage drop calculation rules when one or more generators operate in the network.
Preferably, the first preset rule is obtained by the following formula:
Figure BDA0002535286430000041
wherein Δ U represents the generator transient voltage drop, UGRepresenting the rated voltage, U, of the generatorMRepresenting the rated voltage of the motor, INRepresenting the rated current of the generator, IsTRepresents a starting current x 'at the time of direct start of the motor'dRepresents the generator direct axis transient reactance, x ″)dRepresenting the direct-axis sub-transient reactance of the generator, and d representing a step-down starting coefficient.
Preferably, the second preset rule is obtained by the following formula:
ΔU＝x′d/(Sg/LoadkVA+x′d)×100％
wherein, delta U represents the transient voltage drop of the generator, Sg represents the rated power of the generator, LoadkVA represents the load starting power of the generator, x'dRepresenting the generator direct axis transient reactance.
Preferably, the third preset rule is obtained by the following formula:
Figure BDA0002535286430000042
wherein Δ U represents the generator transient voltage drop, IsTRepresents the starting current at the time of direct start of the motor, IgRepresenting the rated current, x 'of the generator'dRepresenting direct shaft transient electricity of the generatorN represents the number of the generators in the network,
Figure BDA0002535286430000043
represents a power factor at the time of start of the motor,
Figure BDA0002535286430000044
representing the power factor angle.
Preferably, the pressure drop obtaining module includes:
the judging unit is used for judging the parallel connection quantity of the generators;
the first determining unit is used for determining the transient voltage drop of the generator by utilizing the third preset rule if the number of the parallel connection units is multiple;
and/or the presence of a gas in the gas,
a second determining unit, configured to calculate, if the number of parallel connections is a single one, a first transient voltage drop, a second transient voltage drop, and a third transient voltage drop of the generator according to the first preset rule, the second preset rule, and the third preset rule;
a third determining unit, configured to determine a transient voltage drop of the generator based on the first transient voltage drop, the second transient voltage drop, and the third transient voltage drop of the generator.
In a fourth aspect, the present invention also provides a starting apparatus for a power plant, the starting apparatus comprising:
the device for acquiring the transient voltage drop of the generator is used for calculating the transient voltage drop of the generator in the power equipment to be detected;
the starting module is used for comparing the transient voltage drop with a preset transient voltage drop threshold, if the transient voltage drop is larger than the transient voltage drop threshold, the starting mode of the power equipment to be detected is determined to be step-down starting or soft starting, and if the transient voltage drop is smaller than the transient voltage drop threshold, the starting mode of the power equipment to be detected is determined to be direct starting.
In a fifth aspect, the present invention further provides an electronic device, including a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor, when executing the computer program, implements the method for acquiring a transient voltage drop of a generator according to any one of the above aspects or implements the method for starting a power plant according to the second aspect.
In a sixth aspect, the present invention further provides a computer-readable storage medium, in which a computer program is stored, and the computer program is executed by a processor, wherein the method for obtaining the transient voltage drop of the generator or the steps of the method for starting the power plant according to the second aspect are implemented.
The positive progress effects of the invention are as follows: a method and apparatus for transient voltage drop acquisition, device start-up, a device and a storage medium are provided. The method comprises the steps of selecting a preset rule of transient voltage drop calculation by obtaining basic information of a generator and operation data of a motor, and calculating the transient voltage drop of the generator according to the preset rule and performance parameters of the motor and an engine. The invention overcomes the defects of time and labor waste and low accuracy caused by calculating the transient voltage drop of the generator by using an empirical formula in the prior art. Calculating the transient voltage drop of a generator in the power equipment to be detected by using the method; and comparing the transient voltage drop with a preset transient voltage drop threshold value so as to determine the starting mode of the power equipment. The simple judging method for the starting mode of the power equipment is provided, and the defect of low accuracy caused by judging the starting mode by experience in the prior art is overcome.
Drawings
Fig. 1 is a flowchart of a method for obtaining a transient voltage drop of a generator according to embodiment 1 of the present invention.
Fig. 2 is a flowchart of step S13 of the method for obtaining transient voltage drop of a generator according to embodiment 1 of the present invention.
Fig. 3 is a flowchart of a starting method of a power plant of embodiment 2 of the invention.
Fig. 4 is a block diagram of a device for acquiring transient voltage drop of a generator according to embodiment 3 of the present invention.
Fig. 5 is a block schematic diagram of a starting apparatus of a power plant of embodiment 4 of the invention.
Fig. 6 is a schematic diagram of a hardware structure of an electronic device according to embodiment 5 of the present invention.
Detailed Description
The invention is further illustrated by the following examples, which are not intended to limit the scope of the invention.
Example 1
The embodiment provides a method for acquiring transient voltage drop of a generator, and referring to fig. 1, the method includes the following steps:
step S11, acquiring basic information of the generator and operation data of the motor; the basic information comprises the model number, the parallel connection number and the load starting mode of the generator.
And step S12, acquiring a preset rule of transient pressure drop calculation.
And step S13, calculating the transient voltage drop of the generator according to a preset rule based on the basic information and the operation data. The preset rules comprise a first preset rule, a second preset rule and a third preset rule, the first preset rule and the second preset rule represent transient voltage drop calculation rules when a single generator operates in a network, and the third preset rule represents transient voltage drop calculation rules when one or more generators operate in the network.
In marine and oceanographic engineering projects, alternators are largely used as main power sources. When the load is suddenly increased, the voltage fluctuation of the generator is caused, so the transient voltage of the generator needs to be calculated in the design stage, the fluctuation characteristic of the voltage of the generator needs to be fully considered, the voltage fluctuation characteristic of the system is in an allowable range, and the adverse influence on the power grid and the overall operation is avoided or reduced as much as possible.
In this embodiment, a user may input different parameters, for example, a resistance transient state or an ultra-transient state impedance value of the generator, a maximum load parameter, a power grid parameter, and the like, according to a preselected scheme of an actual project device, and automatically and rapidly generate a transient voltage drop value of the generator. If the selection of the type, the parallel connection quantity and the load starting mode of the generator need to be adjusted, the adjusted parameters are input again.
The technical scheme of the application can meet the requirements of actual projects of ships and ocean engineering, can also be used for verifying the impact of transient voltage on a generator and a power grid when the high-power motor is started, and can also be used for guiding the setting of the upper limit, the lower limit and the average value of the model selection value.
Wherein the first preset rule is obtained by the following formula:
Figure BDA0002535286430000071
Δ U represents the transient voltage drop of the generator, UGIndicating rated voltage, U, of the generatorMIndicating rated voltage of motor, INRepresenting the rated current of the generator, IsTDenotes a starting current, x 'at the time of direct start of the motor'dRepresents the transient reactance of the direct axis of the generator, x ″)dThe reactance of the direct-axis secondary transient state of the generator is represented, and d represents a voltage reduction starting coefficient.
In the embodiment, the formula is applied to the conditions of 1 power generation on-grid operation condition of a simple civil ship and 1 high-power load, and mainly relates to the starting current of an induction motor. The formula comprises 7 parameters, wherein the main parameters comprise rated voltage of the generator and the unit is V; rated voltage of the motor, and the unit is V; rated current of the generator, and the unit is A; starting current when the motor is directly started, wherein the unit is A; the transient reactance of the direct axis of the generator and the transient reactance of the sub-direct axis of the generator are vector parameters without units. The voltage reduction starting coefficient d can be selected to have different values according to different starting modes. For example, when the motor is started directly, d is 1; the motor is started by the autotransformer, and the value is usually 0.8, 0.65 or 0.5.
It should be noted that the formula can be applied to an excel table to perform data calculation. Because any parameter change needs to be recalculated, if the parameter change is calculated manually, dozens of times of substitution of the formula are involved, and the calculation is time-consuming and error-prone.
Wherein the second preset rule is obtained by the following formula:
ΔU＝x′d/(Sg/LoadkVA+x′d)×100％
delta U represents the transient voltage drop of the generator, Sg represents the rated power of the generator, LoadkVA represents the load starting power of the generator, x'dRepresenting the transient reactance of the direct axis of the generator.
In the embodiment, the formula is applied to the conditions of 1 power generation on-grid operation condition and 1 high-power load of a simple civil ship, and mainly relates to the starting power of a cage type motor. The formula contains the following parameters: rated power of the generator, and the unit is kVA; load starting power in kVA. In the above equation, LoadkVA is (Load kW × K d2)/h, K represents a starting current multiple, h represents motor efficiency, and d represents a step-down starting coefficient.
It should be noted that the above formula inputs can be locked in excel tables, and generator and motor parameters can be directly entered into tables including Sg, LoadkVA, h, IsT、x′dAnd a reduced pressure startup coefficient d. The transient voltage drop value of the generator can be rapidly calculated.
Wherein the third preset rule is obtained by the following formula:
Figure BDA0002535286430000081
where Δ U represents the generator transient voltage drop, IsTIndicating the starting current at direct start of the motor, IgRepresenting the rated current, x 'of the generator'dThe transient reactance of the direct axis of the generator is represented, N represents the number of the generators in the network,
Figure BDA0002535286430000082
represents the power factor at the time of starting of the motor,
Figure BDA0002535286430000083
representing the power factor angle.
In this embodiment, the above formula is applied to the situation that more than 2 generators are in the network operation condition, and the marine platform or FPSO is used to start 1 super-power load. The formula input can be locked in an excel table to obtain a corresponding calculation result.
In this embodiment, referring to fig. 2, the step S13 includes the following steps:
and step S131, judging the parallel connection number of the generators.
And S132, if the number of the parallel connection is multiple, determining the transient voltage drop of the generator by using a third preset rule.
And/or the presence of a gas in the gas,
and S133, if the number of the parallel-connected units is single, calculating to obtain a first transient voltage drop, a second transient voltage drop and a third transient voltage drop of the generator by using a first preset rule, a second preset rule and a third preset rule.
And S134, determining the transient voltage drop of the generator based on the first transient voltage drop, the second transient voltage drop and the third transient voltage drop of the generator.
In this embodiment, after judging that the number of the outgoing motors connected in parallel is 1 or more, the corresponding first preset rule, second preset rule or third preset rule is selected, and the first transient voltage drop, the second transient voltage drop and the third transient voltage drop of the generator are correspondingly calculated. And processing the values of the first transient voltage drop, the second transient voltage drop and the third transient voltage drop, and determining the final transient voltage drop of the generator through weighted average.
The embodiment of the invention provides a method for acquiring transient voltage drop of a generator, which comprises the steps of acquiring basic information of the generator and operation data of a motor, selecting a preset rule of transient voltage drop calculation, and calculating the transient voltage drop of the generator according to the preset rule and performance parameters of the motor and the engine. The invention overcomes the defects of time and labor waste and low accuracy caused by calculating the transient voltage drop of the generator by using an empirical formula in the prior art.
Example 2
The present embodiment provides a starting method of a power plant, and referring to fig. 3, the method includes the steps of:
step S21, calculating the transient voltage drop of the generator in the power equipment to be detected by using the method of embodiment 1.
And step S22, comparing the transient voltage drop with a preset transient voltage drop threshold value.
And if the transient voltage drop is larger than the transient voltage drop threshold value, determining the starting mode of the power equipment to be detected as the voltage reduction starting or the soft starting.
And if the transient voltage drop is smaller than the transient voltage drop threshold value, determining the starting mode of the power equipment to be detected as direct starting.
In this embodiment, the parameters of the generator and the motor are input, and the transient voltage drop is calculated. The voltage drop value is the impact range which can be endured by the power grid, and if the transient voltage drop is beyond the design allowable range, the parameters of the motor can be adjusted, such as the starting mode can be changed from direct starting to voltage drop starting or soft starting.
In the embodiment of the invention, the starting method of the power equipment is provided, and the starting mode of the power equipment is determined by calculating the transient voltage drop of a generator in the power equipment to be detected and comparing the transient voltage drop with a preset transient voltage drop threshold value. The simple judgment method for the starting mode of the power equipment is provided, and the defect of low accuracy caused by judging the starting mode by experience in the prior art is overcome.
Example 3
The embodiment provides a device for acquiring transient voltage drop of a generator, and referring to fig. 4, the device includes: a first extraction module 210, a second extraction module 220, and a pressure drop extraction module 230.
A first obtaining module 210, configured to obtain basic information of the generator and operation data of the motor; the basic information comprises the model number, the parallel connection number and the load starting mode of the generator.
The second obtaining module 220 is configured to obtain a preset rule of the transient voltage drop calculation.
And a voltage drop obtaining module 230, configured to calculate a transient voltage drop of the generator according to a preset rule based on the basic information and the operation data.
The preset rules comprise a first preset rule, a second preset rule and a third preset rule, the first preset rule and the second preset rule represent transient voltage drop calculation rules when a single generator operates in a network, and the third preset rule represents transient voltage drop calculation rules when one or more generators operate in the network.
In marine and oceanographic engineering projects, alternators are largely used as main power sources. When the load is suddenly increased, the voltage of the generator may fluctuate. Therefore, the transient voltage of the generator needs to be calculated in the design stage, the fluctuation characteristic of the voltage of the generator needs to be fully considered, the voltage fluctuation characteristic of the system is allowed to be in an allowable range, and adverse effects on the power grid and the overall operation are avoided or reduced as much as possible.
In this embodiment, a user may input different parameters, including a generator resistance transient state or an ultra-transient state impedance value, a maximum load parameter, a power grid parameter, and other parameters, according to a preselection scheme of an actual project device, and automatically and rapidly generate a transient voltage drop value of the generator. If the selection of the type, the parallel connection quantity, the load starting mode or parameters and the like of the generator need to be adjusted, the adjusted parameters are input again.
The technical scheme of the application can meet the requirements of actual projects of ships and ocean engineering, can also be used for verifying the impact of transient voltage on a generator and a power grid when the high-power motor is started, and can also be used for guiding the setting of the upper limit, the lower limit and the average value of the model selection value.
Wherein the first preset rule is obtained by the following formula:
Figure BDA0002535286430000101
Δ U represents the transient voltage drop of the generator, UGIndicating rated voltage, U, of the generatorMIndicating rated voltage of motor, INRepresenting the rated current of the generator, IsTDenotes a starting current, x 'at the time of direct start of the motor'dRepresents the transient reactance of the direct axis of the generator, x ″)dThe reactance of the direct-axis secondary transient state of the generator is represented, and d represents a voltage reduction starting coefficient.
In the embodiment, the formula is applied to the conditions of 1 power generation on-grid operation condition of a simple civil ship and 1 high-power load, and mainly relates to the starting current of an induction motor. The formula comprises 7 parameters, wherein the main parameters comprise rated voltage of the generator and the unit is V; rated voltage of the motor, and the unit is V; rated current of the generator, and the unit is A; starting current when the motor is directly started, wherein the unit is A; the transient reactance of the direct axis of the generator and the transient reactance of the sub-direct axis of the generator are vector parameters without units. The voltage reduction starting coefficient d can be selected to have different values according to different starting modes. For example, when the motor is started directly, d is 1; the motor is started by the autotransformer, and the value is usually 0.8, 0.65 or 0.5.
It should be noted that the formula can be applied to an excel table to perform data calculation. Because any parameter change needs to be recalculated, if the parameter change is calculated manually, dozens of times of substitution of the formula are involved, and the calculation is time-consuming and error-prone.
Wherein the second preset rule is obtained by the following formula:
ΔU＝x′d/(Sg/LoadkVA+x′d)×100％
delta U represents the transient voltage drop of the generator, Sg represents the rated power of the generator, LoadkVA represents the load starting power of the generator, x'dRepresenting the transient reactance of the direct axis of the generator.
In the embodiment, the formula is applied to the conditions of 1 power generation on-grid operation condition and 1 high-power load of a simple civil ship, and mainly relates to the starting power of a cage type motor. The formula contains the following parameters: rated power of the generator, and the unit is kVA; load starting power in kVA. In the above equation, LoadkVA is (Load kW × K d2)/h, K represents a starting current multiple, h represents motor efficiency, and d represents a step-down starting coefficient.
It should be noted that the above formula inputs can be locked in excel tables, and generator and motor parameters can be directly entered into tables including Sg, LoadkVA, h, IsT、x′dAnd a reduced pressure startup coefficient d. The transient voltage drop value of the generator can be rapidly calculated.
Wherein the third preset rule is obtained by the following formula:
Figure BDA0002535286430000111
where Δ U represents the generator transient voltage drop, IsTIndicating the starting current at direct start of the motor, IgRepresenting the rated current, x 'of the generator'dThe transient reactance of the direct axis of the generator is represented, N represents the number of the generators in the network,
Figure BDA0002535286430000121
represents the power factor at the time of starting of the motor,
Figure BDA0002535286430000122
representing the power factor angle.
In this embodiment, the above formula is applied to the situation that more than 2 generators are in the network operation condition, and the marine platform or FPSO is used to start 1 super-power load. The formula input can be locked in an excel table to obtain a corresponding calculation result.
In this embodiment, referring to fig. 4, the voltage drop obtaining module 230 includes: a judgment unit 231, a first determination unit 232, a second determination unit 233, and a second determination unit 234.
The judging unit 231 is configured to judge the number of the generators connected in parallel.
The first determining unit 232 is configured to determine the transient voltage drop of the generator according to a third preset rule if the number of the parallel connection units is multiple.
And/or the presence of a gas in the gas,
the second determining unit 233 is configured to calculate, if the number of parallel connections is one, a first transient voltage drop, a second transient voltage drop, and a third transient voltage drop of the generator according to a first preset rule, a second preset rule, and a third preset rule.
A third determining unit 234 for determining a transient voltage drop of the generator based on the first transient voltage drop, the second transient voltage drop and the third transient voltage drop of the generator.
In this embodiment, after judging that the number of the outgoing motors connected in parallel is 1 or more, the corresponding first preset rule, second preset rule or third preset rule is selected, and the first transient voltage drop, the second transient voltage drop and the third transient voltage drop of the generator are correspondingly calculated. And processing the values of the first transient voltage drop, the second transient voltage drop and the third transient voltage drop, and determining the final transient voltage drop of the generator through weighted average.
In the embodiment of the invention, a device for acquiring the transient voltage drop of a generator is provided, wherein a first acquisition module 210 acquires basic information of the generator and operation data of a motor, a first acquisition module 220 selects a preset rule for calculating the transient voltage drop, and a voltage drop acquisition module 230 calculates the transient voltage drop of the generator according to the preset rule and performance parameters of the motor and an engine. The invention overcomes the defects of time and labor waste and low accuracy caused by calculating the transient voltage drop of the generator by using an empirical formula in the prior art.
Example 4
The present embodiment provides a starting apparatus of a power plant, and referring to fig. 5, the apparatus further includes: a means for obtaining transient voltage drop of the generator, a start module 310.
The transient voltage drop of the generator in the power equipment to be detected is calculated by using the transient voltage drop acquiring device of the generator according to the embodiment 3.
The starting module 310 is configured to compare the transient voltage drop with a preset transient voltage drop threshold, determine the starting mode of the power device to be detected as a step-down starting or a soft starting if the transient voltage drop is greater than the transient voltage drop threshold, and determine the starting mode of the power device to be detected as a direct starting if the transient voltage drop is less than the transient voltage drop threshold.
In this embodiment, the parameters of the generator and the motor are input, and the transient voltage drop is calculated. The voltage drop value is an impact range that the power grid can bear, and the starting module 310 determines a starting mode of the power plant according to the transient voltage drop value. If the transient voltage drop is beyond the design allowable range, the parameters of the motor can be adjusted, such as starting mode can be changed from direct start to step-down start or soft start.
In the embodiment of the invention, the starting device of the power equipment is provided, and the starting mode of the power equipment is determined by calculating the transient voltage drop of a generator in the power equipment to be detected and comparing the transient voltage drop with a preset transient voltage drop threshold value. The simple judgment method for the starting mode of the power equipment is provided, and the defect of low accuracy caused by judging the starting mode by experience in the prior art is overcome.
Example 5
The present embodiment provides a schematic structural diagram of an electronic device. The electronic device includes a memory, a processor and a computer program stored in the memory and executable on the processor, and the processor executes the program to implement the method for acquiring the transient voltage drop of the generator according to embodiment 1 or the steps of the method for starting the power device according to embodiment 2, and the electronic device 30 shown in fig. 6 is only an example and should not bring any limitation to the functions and the scope of the embodiment of the present invention.
The electronic device 30 may be embodied in the form of a general purpose computing device, which may be, for example, a server device. The components of the electronic device 30 may include, but are not limited to: the at least one processor 31, the at least one memory 32, and a bus 33 connecting the various system components (including the memory 32 and the processor 31).
The bus 33 includes a data bus, an address bus, and a control bus.
The memory 32 may include volatile memory, such as Random Access Memory (RAM)321 and/or cache memory 322, and may further include Read Only Memory (ROM) 323.
Memory 32 may also include a program/utility 325 having a set (at least one) of program modules 324, such program modules 324 including, but not limited to: an operating system, one or more application programs, other program modules, and program data, each of which, or some combination thereof, may comprise an implementation of a network environment.
The processor 31 executes various functional applications and data processing, such as the generator transient voltage drop acquisition method of embodiment 1 or the steps of the starting method of the power plant described in embodiment 2, by executing the computer program stored in the memory 32.
The electronic device 30 may also communicate with one or more external devices 34 (e.g., keyboard, pointing device, etc.). Such communication may be through input/output (I/O) interfaces 35. Also, model-generating device 30 may also communicate with one or more networks (e.g., a Local Area Network (LAN), a Wide Area Network (WAN), and/or a public network, such as the Internet) via network adapter 36. As shown, network adapter 36 communicates with the other modules of model-generating device 30 via bus 33. It should be understood that although not shown in the figures, other hardware and/or software modules may be used in conjunction with the model-generating device 30, including but not limited to: microcode, device drivers, redundant processors, external disk drive arrays, RAID (disk array) systems, tape drives, and data backup storage systems, etc.
It should be noted that although in the above detailed description several units/modules or sub-units/modules of the electronic device are mentioned, such a division is merely exemplary and not mandatory. Indeed, the features and functionality of two or more of the units/modules described above may be embodied in one unit/module according to embodiments of the invention. Conversely, the features and functions of one unit/module described above may be further divided into embodiments by a plurality of units/modules.
Example 6
The present embodiment provides a computer-readable storage medium on which a computer program is stored, the program, when executed by a processor, implementing the generator transient voltage drop acquisition method of embodiment 1 or implementing the steps of the starting method of the power plant described in embodiment 2.
More specific examples, among others, that the readable storage medium may employ may include, but are not limited to: a portable disk, a hard disk, random access memory, read only memory, erasable programmable read only memory, optical storage device, magnetic storage device, or any suitable combination of the foregoing.
In a possible embodiment, the invention can also be implemented in the form of a program product comprising program code for causing a terminal device to carry out the steps of implementing the method for obtaining a transient voltage drop of a generator according to embodiment 1 or implementing the method for starting a power plant according to embodiment 2, when said program product is run on said terminal device.
Where program code for carrying out the invention is written in any combination of one or more programming languages, the program code may be executed entirely on the user device, partly on the user device, as a stand-alone software package, partly on the user device and partly on a remote device or entirely on the remote device.
While specific embodiments of the invention have been described above, it will be appreciated by those skilled in the art that this is by way of example only, and that the scope of the invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the spirit and scope of the invention, and these changes and modifications are within the scope of the invention.

Claims (14)

1. A method for acquiring transient voltage drop of a generator is characterized by comprising the following steps:
acquiring basic information of a generator and operation data of a motor; the basic information comprises the model, the parallel connection quantity and the load starting mode of the generator;
acquiring a preset rule of transient voltage drop calculation;
calculating the transient voltage drop of the generator according to the preset rule based on the basic information and the operation data;
the preset rules comprise a first preset rule, a second preset rule and a third preset rule, wherein the first preset rule and the second preset rule represent transient voltage drop calculation rules when a single generator operates in a network, and the third preset rule represents transient voltage drop calculation rules when one or more generators operate in the network.
2. The method for obtaining transient voltage drop of generator according to claim 1, wherein said first predetermined rule is obtained by the following formula:
Figure FDA0002535286420000011
wherein Δ U represents the generator transient voltage drop, UGRepresenting the rated voltage, U, of the generatorMRepresenting the rated voltage of the motor, INRepresenting the rated current of the generator, IsTRepresents a starting current x 'at the time of direct start of the motor'dRepresents the generator direct axis transient reactance, x ″)dRepresenting the direct-axis sub-transient reactance of the generator, and d representing a step-down starting coefficient.
3. The method for obtaining transient voltage drop of generator according to claim 1, wherein said second predetermined rule is obtained by the following formula:
ΔU＝x′d/(Sg/LoadkVA+x′d)×100％
wherein, delta U represents the transient voltage drop of the generator, Sg represents the rated power of the generator, LoadkVA represents the load starting power of the generator, x'dRepresenting the generator direct axis transient reactance.
4. The method for obtaining transient voltage drop of generator according to claim 1, wherein said third predetermined rule is obtained by the following formula:
Figure FDA0002535286420000021
wherein Δ U represents the generator transient voltage drop, IsTRepresents the starting current at the time of direct start of the motor, IgRepresenting the rated current, x 'of the generator'dRepresenting the transient reactance of the direct axis of the generator, N representing the number of the generators on the net,
Figure FDA0002535286420000022
represents a power factor at the time of start of the motor,
Figure FDA0002535286420000023
representing the power factor angle.
5. The method for obtaining transient voltage drop of a generator according to claim 1, wherein the calculating transient voltage drop of the generator according to the preset rule based on the basic information and the operation data comprises:
judging the parallel connection quantity of the generators;
if the number of the parallel connection is multiple, determining the transient voltage drop of the generator by utilizing the third preset rule;
and/or the presence of a gas in the gas,
if the number of the parallel connections is single, calculating to obtain a first transient voltage drop, a second transient voltage drop and a third transient voltage drop of the generator by utilizing the first preset rule, the second preset rule and the third preset rule;
determining a transient voltage drop of the generator based on the first transient voltage drop, the second transient voltage drop, and the third transient voltage drop of the generator.
6. A starting method of a power plant, characterized by comprising the steps of:
calculating the transient voltage drop of the generator in the power equipment to be detected by using the method for acquiring the transient voltage drop of the generator according to any one of claims 1 to 5;
comparing the transient voltage drop with a preset transient voltage drop threshold;
if the transient voltage drop is larger than the transient voltage drop threshold value, determining the starting mode of the power equipment to be detected as voltage reduction starting or soft starting;
and if the transient voltage drop is smaller than the transient voltage drop threshold value, determining the starting mode of the power equipment to be detected as direct starting.
7. An apparatus for obtaining transient voltage drop of a generator, the apparatus comprising:
the first acquisition module is used for acquiring basic information of the generator and operation data of the motor; the basic information comprises the model, the parallel connection quantity and the load starting mode of the generator;
the second acquisition module is used for acquiring a preset rule of transient voltage drop calculation;
the voltage drop acquisition module is used for calculating the transient voltage drop of the generator according to the preset rule based on the basic information and the operation data;
the preset rules comprise a first preset rule, a second preset rule and a third preset rule, wherein the first preset rule and the second preset rule represent transient voltage drop calculation rules when a single generator operates in a network, and the third preset rule represents transient voltage drop calculation rules when one or more generators operate in the network.
8. The apparatus for obtaining transient voltage drop of generator according to claim 7, wherein said first predetermined rule is obtained by the following formula:
Figure FDA0002535286420000031
wherein Δ U represents the generator transient voltage drop, UGRepresenting the rated voltage, U, of the generatorMRepresenting the rated voltage of the motor, INRepresenting the rated current of the generator, IsTRepresents a starting current x 'at the time of direct start of the motor'dRepresents the generator direct axis transient reactance, x ″)dRepresenting the direct-axis sub-transient reactance of the generator, and d representing a step-down starting coefficient.
9. The apparatus for obtaining transient voltage drop of generator according to claim 7, wherein said second predetermined rule is obtained by the following formula:
ΔU＝x′d/(Sg/LoadkVA+x′d)×100％
wherein, delta U represents the transient voltage drop of the generator, Sg represents the rated power of the generator, LoadkVA represents the load starting power of the generator, x'dRepresenting the generator direct axis transient reactance.
10. The apparatus for obtaining transient voltage drop of generator according to claim 7, wherein said third predetermined rule is obtained by the following formula:
Figure FDA0002535286420000041
wherein Δ U represents the generator transient voltage drop, IsTRepresents the starting current at the time of direct start of the motor, IgRepresenting the rated current, x 'of the generator'dRepresenting the transient reactance of the direct axis of the generator, N representing the number of the generators on the net,
Figure FDA0002535286420000042
represents a power factor at the time of start of the motor,
Figure FDA0002535286420000043
representing the power factor angle.
11. The transient voltage drop capture device of claim 7, wherein said voltage drop capture module comprises:
the judging unit is used for judging the parallel connection quantity of the generators;
the first determining unit is used for determining the transient voltage drop of the generator by utilizing the third preset rule if the number of the parallel connection units is multiple;
and/or the presence of a gas in the gas,
a second determining unit, configured to calculate, if the number of parallel connections is a single one, a first transient voltage drop, a second transient voltage drop, and a third transient voltage drop of the generator according to the first preset rule, the second preset rule, and the third preset rule;
a third determining unit, configured to determine a transient voltage drop of the generator based on the first transient voltage drop, the second transient voltage drop, and the third transient voltage drop of the generator.
12. A starting device for a power plant, the starting device comprising:
the device for acquiring the transient voltage drop of the generator according to any one of claims 7 to 11, which is used for calculating the transient voltage drop of the generator in the power equipment to be detected;
the starting module is used for comparing the transient voltage drop with a preset transient voltage drop threshold, if the transient voltage drop is larger than the transient voltage drop threshold, the starting mode of the power equipment to be detected is determined to be step-down starting or soft starting, and if the transient voltage drop is smaller than the transient voltage drop threshold, the starting mode of the power equipment to be detected is determined to be direct starting.
13. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor implements the method for starting a power plant according to claim 6 when executing the computer program, or implements the method for obtaining a transient voltage drop of a generator according to any one of claims 1 to 5 when executing the computer program.
14. A computer-readable storage medium, characterized in that a computer program is stored in the computer-readable storage medium, which computer program, when being executed by a processor, carries out the steps of the method for starting a power plant according to claim 6, or which computer program, when being executed by a processor, carries out the steps of the method for obtaining a generator transient pressure drop according to any one of claims 1-5.
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