CN110943489A - Capacity determination method and device of generator, computer equipment and storage medium - Google Patents
Capacity determination method and device of generator, computer equipment and storage medium Download PDFInfo
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- CN110943489A CN110943489A CN201811114777.5A CN201811114777A CN110943489A CN 110943489 A CN110943489 A CN 110943489A CN 201811114777 A CN201811114777 A CN 201811114777A CN 110943489 A CN110943489 A CN 110943489A
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- 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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
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Abstract
The application relates to a capacity determination method and device of a generator, computer equipment and a storage medium. The method comprises the following steps: the computer equipment obtains the impact load when a maximum-capacity motor in the gas turbine unit is started by obtaining the calculation load when the gas turbine unit is started and according to the calculation load and the preset starting current multiple, and then determines the capacity of the generator according to the size of the impact load. Because the variable-frequency starting device is connected with the gas turbine unit, the gas turbine unit can be started in a variable-frequency mode, the starting current multiple of the variable-frequency starting device is reduced, the impact load of a maximum-capacity motor in the gas turbine unit during starting is reduced, the impact load resistance of the generator is further improved, the starting voltage drop of the gas turbine unit can be reduced, and the smooth starting of a power grid is guaranteed.
Description
Technical Field
The present application relates to the field of power supply technologies, and in particular, to a method and an apparatus for determining a capacity of a power generator, a computer device, and a storage medium.
Background
In recent years, large-area blackout incidents occur in succession worldwide, and these major accidents cause catastrophic social impact and economic loss. When a large-area power failure accident occurs, the normal operation of the power grid is recovered in a short time, and the economic loss can be reduced to the maximum extent. The black start function of the generator set in the power grid has great significance for electric energy guarantee.
For a common generator set in a power grid, namely a 9E gas turbine generator set (9E set for short), two current black start schemes exist, and one scheme is to adopt the parallel operation of two high-speed diesel generators as a black start power supply of the 9E set.
However, in practical application, when the load distribution of the two diesel generators is unbalanced, the impact load resistance of the diesel generators is insufficient, so that the starting voltage drop of the 9E unit is large, and finally the grid starting fails.
Disclosure of Invention
In view of the above, it is necessary to provide a capacity determination method and apparatus for a power generator, a computer device, and a storage medium.
A capacity determination method of a generator, the method comprising:
acquiring a calculation load when the gas turbine set is started, wherein the calculation load is the minimum power required when the gas turbine set is started;
acquiring an impact load when a maximum-capacity motor in the gas turbine unit is started according to the calculated load and a preset starting current multiple; the starting current multiple is the multiple between the starting current and the rated current of the maximum-capacity motor in the gas turbine unit when the gas turbine unit is started in a frequency conversion mode;
and determining the capacity of the generator according to the impact load.
In one embodiment, determining the capacity of the generator according to the magnitude of the impact load further comprises:
and according to the impact load and the calculation load, the capacity of the generator is larger than the impact load and larger than the calculation load.
In one embodiment, the determining the capacity of the generator according to the magnitude of the impact load and the magnitude of the calculation load includes:
acquiring a capacity selection margin of the generator;
and determining the capacity of the generator according to the capacity selection margin, the impact load and the calculation load.
In one embodiment, the method for determining the capacity of the generator further comprises:
acquiring starting power required by starting a maximum-capacity motor in the gas turbine unit;
calculating output voltage drop when the generator starts the gas turbine set with the capacity of the generator according to the capacity of the generator, the starting current multiple, the transient reactance of the generator and the starting power required when the maximum capacity motor is started;
judging whether the output voltage drop is smaller than a preset minimum voltage drop threshold value or not;
and if so, determining the capacity of the generator as the target capacity.
In one embodiment, the calculating the output voltage drop of the generator when the generator starts the internal combustion engine set at the capacity of the generator according to the capacity of the generator, the starting current multiple, the transient reactance of the generator and the starting power required by the maximum capacity motor when starting comprises:
according to the inclusion
A relational equation that determines the output pressure drop;
wherein, the SeFor the capacity of the generator, the KqIs a multiple of the starting current, PmIs the starting power required when the maximum capacity motor is started, XdIs the transient reactance of the generator.
In one embodiment, the obtaining the calculation load of the internal combustion engine set at the time of starting includes:
according to the formula ScCalculating the calculation load S as K ∑ Pc；
And P is starting power of each target device in the gas turbine unit when being started, and K is a conversion coefficient.
In one embodiment, obtaining an impact load when a maximum-capacity motor in the gas turbine unit is started according to the calculated load and a preset starting current multiple includes:
according to the inclusion
Calculating the impact load;
wherein, the ScFor the computation load, the KqIs the starting current multiple, K is a conversion factor, PmAnd n is the number of the combustion engine units.
A capacity determination apparatus for a generator, the generator being connected to the variable frequency starting apparatus, the generator being used for black-starting a gas turbine assembly of an electrical grid, the apparatus comprising:
the calculation load acquisition module is used for acquiring the calculation load when the gas turbine set is started, wherein the calculation load is the minimum power required when the gas turbine set is started;
the impact load obtaining module is used for obtaining the impact load when a maximum-capacity motor in the gas turbine unit is started according to the calculated load and a preset starting current multiple; the starting current multiple is the multiple between the starting current and the rated current of the maximum-capacity motor in the gas turbine unit when the gas turbine unit is started in a frequency conversion mode;
and the capacity determining device is used for determining the capacity of the generator according to the impact load.
A computer device comprising a memory and a processor, the memory storing a computer program, the processor implementing the following steps when executing the computer program:
acquiring a calculation load when the gas turbine set is started, wherein the calculation load is the minimum power required when the gas turbine set is started;
acquiring an impact load when a maximum-capacity motor in the gas turbine unit is started according to the calculated load and a preset starting current multiple; the starting current multiple is the multiple between the starting current and the rated current of the maximum-capacity motor in the gas turbine unit when the gas turbine unit is started in a frequency conversion mode;
and determining the capacity of the generator according to the impact load.
A computer-readable storage medium, on which a computer program is stored which, when executed by a processor, carries out the steps of:
acquiring a calculation load when the gas turbine set is started, wherein the calculation load is the minimum power required when the gas turbine set is started;
acquiring an impact load when a maximum-capacity motor in the gas turbine unit is started according to the calculated load and a preset starting current multiple; the starting current multiple is the multiple between the starting current and the rated current of the maximum-capacity motor in the gas turbine unit when the gas turbine unit is started in a frequency conversion mode;
and determining the capacity of the generator according to the impact load.
According to the method and the device for determining the capacity of the generator, the computer equipment obtains the impact load of the maximum-capacity motor in the gas turbine unit when the motor unit is started according to the calculated load and the preset starting current multiple, and then determines the capacity of the generator according to the size of the impact load. Because the variable-frequency starting device is connected with the gas turbine unit, the gas turbine unit can be started in a variable-frequency mode, the starting current multiple of the variable-frequency starting device is reduced, the impact load of a maximum-capacity motor in the gas turbine unit during starting is reduced, the impact load resistance of the generator is further improved, the starting voltage drop of the gas turbine unit can be reduced, and the smooth starting of a power grid is guaranteed.
Drawings
FIG. 1 is an architecture diagram of a power generation system in one embodiment;
FIG. 2 is a schematic flow diagram of a method for capacity determination of a generator according to one embodiment;
FIG. 3 is a schematic flow chart of a capacity determination method for a generator according to another embodiment;
FIG. 4 is a schematic flow chart of a capacity determination method for a generator according to another embodiment;
FIG. 5 is a block diagram showing a structure of a capacity determining apparatus of a generator according to an embodiment;
FIG. 6 is a block diagram showing a structure of a capacity determining apparatus of a generator according to another embodiment;
FIG. 7 is a block diagram showing a structure of a capacity determining apparatus of a generator according to another embodiment;
FIG. 8 is an internal block diagram of a computing node device provided in one embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
The capacity determination method for the generator provided by the embodiment of the invention can be applied to a system architecture as shown in fig. 1. The system comprises a generator 110, a variable frequency starting device 120 and a combustion engine set 130. The generator 110 may be, but not limited to, a high-speed diesel generator, a low-speed diesel generator, and other types of generators, the variable frequency starting apparatus 120 is connected to the combustion engine assembly 130 to start the combustion engine assembly in a variable frequency manner, and the combustion engine assembly may be one or more combustion engine assemblies.
It should be noted that the execution subject of the embodiment of the present invention may be a capacity determination apparatus of a generator, which may be implemented as part or all of a computer device by software, hardware, or a combination of software and hardware. The method embodiments described below are described by taking as an example that the execution subject is a computer device.
In one embodiment, as shown in fig. 2, a capacity determining method for a generator is provided, which is described by taking the method as an example for a computer device to determine the capacity of the generator in fig. 1, and includes:
s101, obtaining a calculation load when the gas turbine set is started, wherein the calculation load is the minimum power required when the gas turbine set is started;
specifically, the gas turbine set in this embodiment may include one or more gas turbines, and the gas turbine set may supply power to the power grid, and in addition, the generator may be used as a black start power source of the gas turbine set when the power grid is in a full-line power failure. When the power grid is in full-line power failure, if the capacity of the selected generator is not appropriate, or two high-speed diesel generators are selected to be connected in parallel but the load distribution is unbalanced, the impact load resistance of the diesel generators is insufficient, the starting voltage drop of a gas turbine unit is large, and finally the power grid starting failure is caused. Therefore, with respect to this problem, the present embodiment mainly solves the problem by determining an appropriate generator capacity.
In particular for determining the generatorDuring capacity, the computer device may first obtain the calculation load when the combustion engine set is started. Alternatively, the computer device may determine the computational load of the group of combustion engines by means of a relation comprising K ∑ P, for example by adding a constant or subtracting a constant to the relation K ∑ P, etc. Wherein, P is the starting power of each target device in the gas turbine unit when starting, the target device is a device that must be driven when the gas turbine unit is in black start, and K is a conversion coefficient, which can be a power weighting coefficient of each internal device set by comprehensively referring to factors such as process level, unit operation mode, and the like, optionally, the value thereof can be 0.8. Optionally, the computer device may also use the formula ScCalculating to obtain the calculation load of the gas turbine set as K sigma P; optionally, the computer device may also call the computing load calculated by other external devices, and the embodiment does not limit how the computer device obtains the computing load.
Taking a gas turbine unit commonly used in a power grid, namely a 9E unit as an example, target devices in the 9E unit comprise a gas turbine starting motor, an auxiliary lubricating oil pump motor power supply, an auxiliary hydraulic oil pump and other devices. The power value of target equipment in the 9E unit is shown in the following table, and the sum of the power of each equipment is as follows: and (6) when Σ P is 1395.24KW, the calculation load of the 9E unit is: sc＝K∑P＝0.8×1395.24＝1116.19KW。
TABLE 1
S102, acquiring an impact load when a maximum-capacity motor in the gas turbine unit is started according to the calculated load and a preset starting current multiple; the starting current multiple is the multiple between the starting current and the rated current of the maximum-capacity motor in the gas turbine unit when the gas turbine unit is started in a frequency conversion mode.
Specifically, the starting current multiple is a multiple between a starting current and a rated current of a maximum-capacity motor in the gas turbine unit when the gas turbine unit is started in a frequency conversion mode. It should be noted, however, that the starting current multiple for the full-pressure start of the internal combustion engine unit is not within the protection scope of the present application. In addition, the maximum-capacity motor in the engine block is a device having the maximum starting power among target devices in the engine block.
When specifically determining the capacity of the generator, the computer device also needs to acquire the impact load when the maximum capacity motor in the gas turbine unit is started. Optionally, during the acquisition of the impact load SmWhen it is, can be by including
Wherein S is obtainedcFor the calculation load obtained in the above-mentioned S101, KqFor starting current multiples, K is the conversion factor introduced above, PmThe starting power required when the maximum-capacity motor is started is n, and the number of the combustion engine units is n. Optionally, the computer device may also use the formula
The impact load is obtained, optionally, the computer device may also call the impact load calculated by other external devices, and the manner of obtaining the impact load is not limited in this embodiment.
When the gas turbine unit is started in a full-voltage mode, the starting current can reach 4-7 times of the rated current, so that the voltage of a power grid is rapidly reduced, and the normal operation of other equipment of the same power grid is influenced; when the frequency conversion type starting device is started, the starting current is reduced and is generally 2-3 times of the rated current, the fluctuation rate of the power grid voltage is generally within 10%, and the influence on other equipment is very small. Taking the gas turbine set as a 9E set as an example, the maximum-capacity motor is a gas turbine starting motor, and the starting power P of the motor ismUnder the condition of frequency conversion starting, the starting current of the 9E unit is 2 times of the rated current, namely Kq2. Then, based on the previously obtained calculation load ScAnd a preset conversion coefficient K, wherein one 9E unit works, namely n is 1, and the impact load when a maximum-capacity motor in the 9E unit is started is
And S103, determining the capacity of the generator according to the impact load.
In particular, the computer device may be based on the obtained impact load SmTo determine the capacity S of the generatoreCapacity S of the generatoreThe impact load can be equal to or larger than the impact load; the capacity of the generator may also be determined according to the size of the impact load and the size of the calculation load, where the capacity of the generator is greater than the size of the impact load and greater than the size of the calculation load, and the method for determining the capacity of the generator is not limited herein.
Taking the gas turbine unit as a 9E unit as an example, the impact load when the maximum-capacity motor in the 9E unit is started is Sm1877.46KW, the calculation load is ScWhen the capacity of the generator is selected to satisfy S, 1116.19KWe>1877.46KW。
According to the method for determining the capacity of the generator, the computer equipment obtains the calculated load when the gas turbine set is started, obtains the impact load when the maximum-capacity motor in the gas turbine set is started according to the calculated load and the preset starting current multiple, and then determines the capacity of the generator according to the size of the impact load. Because the variable-frequency starting device is connected with the gas turbine unit, the gas turbine unit can be started in a variable-frequency mode, the starting current multiple of the variable-frequency starting device is reduced, the impact load of a maximum-capacity motor in the gas turbine unit during starting is reduced, the impact load resistance of the generator is further improved, the starting voltage drop of the gas turbine unit can be reduced, and the smooth starting of a power grid is guaranteed.
Fig. 3 is a schematic flow chart of a capacity determination method of a generator according to another embodiment. The embodiment relates to a specific process that the computer device determines the capacity of the generator according to the capacity selection margin, the impact load size and the calculation load size. On the basis of the above embodiment, as shown in fig. 3, the above S103 may include:
s201, acquiring a capacity selection margin of the generator;
specifically, since the load of the internal combustion engine set changes when the internal combustion engine set is started, and in addition, the margin of the capacity needs to be considered when the generator works so as to adapt to different working conditions, when the computer device determines the capacity of the generator, the computer device can also set the capacity selection margin of the generator so as to determine the proper capacity of the generator. Capacity selection margin KsThe additional power may be added, or a scaling factor may be added, and the form of the capacity selection margin is not limited herein. Generally, the capacity selection margin can be comprehensively determined according to the operation mode, the process level, the capacity size and the like of the generator.
Taking the 9E combustion engine as an example, the generator capacity required during the black start of the 9E combustion engine is generally large, and the capacity selection margin can be set as a conversion coefficient, Ks＝1.18。
S202, determining the capacity of the generator according to the capacity selection margin, the impact load and the calculation load.
In particular, the computer device may select the margin K according to the capacitysThe above-mentioned impact load SmAnd the above calculation load ScTo determine the capacity of the generator. Optionally, a capacity selection margin KsMay be additional power, and the capacity of the generator may be the calculated or impact load plus the capacity selection margin, i.e. Se＝Ks+ScOr Se＝Ks+Sm(ii) a Optionally, a capacity selection margin KsIt can also be a conversion factor, and the generator capacity can be Ks、Sc、SmOptionally, the generator capacity may be Se＝KsScOr Se＝KsSmAlternatively, the generator capacity may be Se＝(1+Ks)ScOr Se＝(1+Ks)SmThe manner of determining the generator capacity is not limited herein.
Continuing with the example that the gas turbine set is a 9E set, assume that the calculation load of the 9E set is Sc1116.19KW, the impact load is Sm＝1877.46KW, capacity selection margin K of the generators1.18, the engine capacity may be selected as Se＝KsSm1.18 × 1877.46 × 2214.86 KW. Taking S into consideration of parameters of actual generator capacity and actual applicatione＝2200KW。
In the method for determining the capacity of the generator, the computer device determines the capacity of the generator according to the capacity selection margin, the size of the impact load and the size of the calculation load. The capacity of the determined generator is more appropriate due to the fact that the load change of the gas turbine unit and the allowance of the capacity of the generator are considered in the process of determining the capacity, and when the gas turbine unit is started, the generator is higher in impact load resistance and smaller in starting pressure drop.
FIG. 4 is a flow chart illustrating a method for determining engine capacity according to another embodiment. The embodiment relates to a process that after the computer device determines the capacity of the generator, the computer device judges the output voltage drop of the obtained generator capacity so as to determine whether the obtained generator capacity is accurate. On the basis of the above embodiment, as shown in fig. 4, S103 or S202 may further include, after:
s301, obtaining starting power required by starting of a maximum-capacity motor in the combustion engine set.
Specifically, when the computer device performs the generator output voltage drop verification, it needs to first obtain the starting power required when the maximum-capacity motor in the internal combustion engine unit is started, that is, the maximum power of the target device in the internal combustion engine unit.
In the last embodiment, the starting power required when the maximum capacity motor in the 9E unit is started is Pm＝1000KW。
S302, calculating output voltage drop when the generator starts the gas turbine set with the capacity of the generator according to the capacity of the generator, the starting current multiple, the transient reactance of the generator and the starting power required when the maximum capacity motor is started.
Specifically, the transient reactance of the generator is an internal parameter of the generator, and the computer device may preset the parameter value. ComputingThe machine equipment can be based on the capacity S of the generatoreStarting current multiple KqTransient reactance X of generatordAnd the starting power P required for starting the maximum capacity motormAnd determining the output pressure drop when the generator starts the combustion engine set. The output voltage drop is the degree of the output voltage reduced relative to the rated voltage when the generator starts the combustion engine set, and can be determined according to the requirements
May be determined by a formula variation including the relationship, and is not limited herein.
Continuing with the example where the engine block is a 9E engine, on the basis of the previous embodiment, Se＝2200KW，Kq＝2，Pm1000KW, transient reactance X of selected generatord0.25 Ω, according to the formula
Calculating to obtain that when the generator starts the 9E unit, the output voltage of the generator is reduced to Um＝22.2％。
And S303, judging whether the output voltage drop is smaller than a preset maximum voltage drop threshold value.
Specifically, when the computer device performs output generator output voltage drop verification, a maximum voltage drop threshold may be preset. The threshold is the maximum value of the output voltage drop of the generator when the generator starts the gas turbine unit, and if the voltage drop of the generator is larger than the threshold, the gas turbine unit is failed to start. The threshold values may be determined according to the relevant black start protocol or the actual operating conditions of the combustion engine assembly.
According to the relevant protocol of the black start of the 9E unit, when the generator starts the 9E unit, the maximum voltage drop threshold of the generator can be 25%.
And S304, if so, determining the capacity of the generator as the target capacity.
Specifically, the target capacity of the generator is an appropriate generator capacity size determined after the verification. If the computer device preliminarily determines the capacity of the generator according to the method, and the output pressure drop of the generator is smaller than a preset maximum pressure drop threshold value when the engine set of the combustion engine is started to work, the capacity of the generator can be determined to be the target capacity; if the output voltage drop of the generator is larger than the preset maximum voltage drop threshold value, the capacity of the generator needs to be determined again.
And S303, judging that the target capacity of the generator is 2200KW if the output voltage drop of the generator is smaller than a preset maximum voltage drop threshold when the determined generator starts the 9E unit.
According to the method for determining the capacity of the generator, after the capacity of the generator is determined by the computer equipment, the output voltage drop of the obtained capacity of the generator is further judged, so that whether the obtained capacity of the generator is accurate or not is determined. The step of judging the output voltage drop is added, so that whether the capacity of the generator is proper or not can be further determined, and the starting success rate is higher when the generator is used for starting the gas turbine unit; in addition, according to the method for determining the capacity of the generator, under the condition that the variable-frequency starting device is connected, the gas turbine set is started in a variable-frequency mode, and the starting current multiple is reduced, so that the impact load when a maximum-capacity motor in the gas turbine set is started is reduced, the gas turbine set can be started by one generator, equipment such as a cabinet in the existing scheme is reduced, the system is simple, the number of fault points is reduced, and the reliability of the system is improved; under the condition that the variable-frequency starting device is connected, the starting current multiple and the voltage fluctuation of the gas turbine unit are reduced, so that the reaction of the gas turbine unit to an external sudden load can be fast, and the voltage of the gas turbine unit is more stable; under the condition that the variable-frequency starting device is connected, the starting current multiple of the gas turbine unit is reduced, so that the heat generated by the current and acting on the wire is reduced, the insulation life can be greatly prolonged, and the service life of equipment can be prolonged.
It should be understood that although the various steps in the flow charts of fig. 2-4 are shown in order as indicated by the arrows, the steps are not necessarily performed in order as indicated by the arrows. The steps are not performed in the exact order shown and described, and may be performed in other orders, unless explicitly stated otherwise. Moreover, at least some of the steps in fig. 2-4 may include multiple sub-steps or multiple stages that are not necessarily performed at the same time, but may be performed at different times, and the order of performance of the sub-steps or stages is not necessarily sequential, but may be performed in turn or alternating with other steps or at least some of the sub-steps or stages of other steps.
In one embodiment, as shown in fig. 5, there is provided a capacity determining apparatus of a generator, the apparatus including: a calculation load obtaining module 10, an impact load obtaining module 20, and a capacity determining module 30, wherein:
a calculation load obtaining module 10, configured to obtain a calculation load when the gas turbine unit is started, where the calculation load is a minimum power required when the gas turbine unit is started;
the impact load obtaining module 20 is configured to obtain an impact load when a maximum-capacity motor in the gas turbine unit is started according to the calculated load and a preset starting current multiple; the starting current multiple is the multiple between the starting current and the rated current of the maximum-capacity motor in the gas turbine unit when the gas turbine unit is started in a frequency conversion mode;
and a capacity determining module 30, configured to determine a capacity of the generator according to the magnitude of the impact load.
In one embodiment, the capacity determining module 30 is specifically configured to determine the capacity of the generator according to the magnitude of the impact load, including according to the magnitude of the impact load and the magnitude of the calculation load, wherein the capacity of the generator is greater than the magnitude of the impact load and greater than the magnitude of the calculation load.
In another embodiment, the computation load obtaining module 10 is specifically configured to obtain the formula ScCalculating the calculation load S as K ∑ PcAnd P is starting power of each target device in the gas turbine unit when being started, and K is a conversion coefficient.
In another embodiment, the impact load acquisition module 20 is specifically adapted to pack-based applicationsComprises
Calculating the impact load, wherein ScFor the computation load, the KqIs the starting current multiple, K is a conversion factor, PmAnd n is the number of the combustion engine units.
The capacity determining apparatus of the generator provided above may implement the above method embodiments, and the implementation principle and technical effect are similar, and are not described herein again.
In an embodiment, as shown in fig. 6, on the basis of the embodiment shown in fig. 5, the capacity determining module 30 includes an obtaining unit 301 and a capacity determining unit 302, where:
an obtaining unit 301, configured to obtain a capacity selection margin of the power generator;
a capacity determining unit 302, configured to determine a capacity of the generator according to the capacity selection margin, the impact load, and the calculation load.
In one embodiment, as shown in fig. 7, the capacity determination apparatus of the generator further includes a voltage drop checking module 40, where the voltage drop checking module 40 includes a starting power obtaining unit 401, a voltage drop calculating unit 402, a voltage drop judging unit 403, and a target capacity confirming unit 404. Wherein:
a starting power obtaining unit 401, configured to obtain starting power required when a maximum capacity motor in the internal combustion engine unit is started;
a voltage drop calculating unit 402, configured to calculate an output voltage drop when the generator starts the internal combustion engine set with the capacity of the generator according to the capacity of the generator, the starting current multiple, a transient reactance of the generator, and a starting power required when the maximum-capacity motor is started;
a voltage drop judging unit 403, configured to judge whether the output voltage drop is smaller than a preset maximum voltage drop threshold;
a target capacity confirmation unit 404, configured to determine, when the output voltage drop is smaller than a preset maximum voltage drop threshold, that the capacity of the generator is a target capacity.
In one embodiment, said pressure drop calculating unit is specifically adapted to include
A relation determining the output pressure drop, wherein SeFor the capacity of the generator, the KqIs a multiple of the starting current, PmIs the starting power required when the maximum capacity motor is started, XdIs the transient reactance of the generator.
The capacity determining apparatus for a generator according to the embodiments of the present invention may implement the above method embodiments, and its implementation principle and technical effect are similar, which are not described herein again.
For specific definition of the capacity determination device of the generator, reference may be made to the above definition of the capacity determination method of the generator, and details are not described herein again. The various modules in the capacity determination apparatus of the generator described above may be implemented in whole or in part by software, hardware, and combinations thereof. The modules can be embedded in a hardware form or independent from a processor in the computer device, and can also be stored in a memory in the computer device in a software form, so that the processor can call and execute operations corresponding to the modules.
In one embodiment, a computer device is provided, which may be a terminal, and its internal structure diagram may be as shown in fig. 8. The computer device includes a processor, a memory, a network interface, a display screen, and an input device connected by a system bus. Wherein the processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device comprises a nonvolatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of an operating system and computer programs in the non-volatile storage medium. The network interface of the computer device is used for communicating with an external terminal through a network connection. The computer program is executed by a processor to implement a method of capacity determination for a generator. The display screen of the computer equipment can be a liquid crystal display screen or an electronic ink display screen, and the input device of the computer equipment can be a touch layer covered on the display screen, a key, a track ball or a touch pad arranged on the shell of the computer equipment, an external keyboard, a touch pad or a mouse and the like.
Those skilled in the art will appreciate that the architecture shown in fig. 8 is merely a block diagram of some of the structures associated with the disclosed aspects and is not intended to limit the computing devices to which the disclosed aspects apply, as particular computing devices may include more or less components than those shown, or may combine certain components, or have a different arrangement of components.
In one embodiment, a computer device is provided, comprising a memory and a processor, the memory having a computer program stored therein, the processor implementing the following steps when executing the computer program:
acquiring a calculation load when the gas turbine set is started, wherein the calculation load is the minimum power required when the gas turbine set is started;
acquiring an impact load when a maximum-capacity motor in the gas turbine unit is started according to the calculated load and a preset starting current multiple; the starting current multiple is the multiple between the starting current and the rated current of the maximum-capacity motor in the gas turbine unit when the gas turbine unit is started in a frequency conversion mode;
and determining the capacity of the generator according to the impact load.
In one embodiment, the processor, when executing the computer program, further performs the steps of: and determining the capacity of the generator according to the impact load, including the impact load and the calculation load, wherein the capacity of the generator is larger than the impact load and the calculation load.
In one embodiment, the processor, when executing the computer program, further performs the steps of: and acquiring a capacity selection margin of the generator, and determining the capacity of the generator according to the capacity selection margin, the impact load and the calculation load.
In one embodiment, the processor, when executing the computer program, further performs the steps of: acquiring starting power required by starting a maximum-capacity motor in the gas turbine unit; calculating output voltage drop when the generator starts the gas turbine set with the capacity of the generator according to the capacity of the generator, the starting current multiple, the transient reactance of the generator and the starting power required when the maximum capacity motor is started; judging whether the output voltage drop is smaller than a preset maximum voltage drop threshold value or not; and if so, determining the capacity of the generator as the target capacity.
In one embodiment, the calculating an output voltage drop when the generator starts the gas turbine assembly at the capacity of the generator according to the capacity of the generator, the starting current multiple, the transient reactance of the generator and the starting power required by the maximum capacity motor when starting comprises:
according to the inclusion
A relation determining the output pressure drop, wherein SeFor the capacity of the generator, the KqIs a multiple of the starting current, PmIs the starting power required when the maximum capacity motor is started, XdIs the transient reactance of the generator.
In one embodiment, the obtaining the calculation load of the internal combustion engine set at the time of starting includes:
according to the formula ScCalculating the calculation load S as K ∑ PcAnd P is the starting power of each target device in the gas turbine unit when being started, and K is a conversion coefficient.
In one embodiment, obtaining the impact load when the maximum-capacity motor in the gas turbine unit is started according to the calculated load and a preset starting current multiple includes:
according to the inclusion
Calculating the impact load, wherein ScFor the computation load, the KqIs the starting current multiple, K is a conversion factor, PmAnd n is the number of the combustion engine units.
In one embodiment, a computer-readable storage medium is provided, having a computer program stored thereon, which when executed by a processor, performs the steps of:
acquiring a calculation load when the gas turbine set is started, wherein the calculation load is the minimum power required when the gas turbine set is started;
acquiring an impact load when a maximum-capacity motor in the gas turbine unit is started according to the calculated load and a preset starting current multiple; the starting current multiple is the multiple between the starting current and the rated current of the maximum-capacity motor in the gas turbine unit when the gas turbine unit is started in a frequency conversion mode;
and determining the capacity of the generator according to the impact load.
In one embodiment, the computer program when executed by the processor further performs the steps of: and determining the capacity of the generator according to the impact load, including the impact load and the calculation load, wherein the capacity of the generator is larger than the impact load and the calculation load.
In one embodiment, the computer program when executed by the processor further performs the steps of: and acquiring a capacity selection margin of the generator, and determining the capacity of the generator according to the capacity selection margin, the impact load and the calculation load.
In one embodiment, the computer program when executed by the processor further performs the steps of: acquiring starting power required by starting a maximum-capacity motor in the gas turbine unit; calculating output voltage drop when the generator starts the gas turbine set with the capacity of the generator according to the capacity of the generator, the starting current multiple, the transient reactance of the generator and the starting power required when the maximum capacity motor is started; judging whether the output voltage drop is smaller than a preset maximum voltage drop threshold value or not; and if so, determining the capacity of the generator as the target capacity.
In one embodiment, the calculating an output voltage drop when the generator starts the gas turbine assembly at the capacity of the generator according to the capacity of the generator, the starting current multiple, the transient reactance of the generator and the starting power required by the maximum capacity motor when starting comprises:
according to the inclusion
A relation determining the output pressure drop, wherein SeFor the capacity of the generator, the KqIs a multiple of the starting current, PmIs the starting power required when the maximum capacity motor is started, XdIs the transient reactance of the generator.
In one embodiment, the obtaining the calculation load of the internal combustion engine set at the time of starting includes:
according to the formula ScCalculating the calculation load S as K ∑ PcAnd P is the starting power of each target device in the gas turbine unit when being started, and K is a conversion coefficient.
In one embodiment, obtaining the impact load when the maximum-capacity motor in the gas turbine unit is started according to the calculated load and a preset starting current multiple includes:
according to the inclusion
Calculating the impact load, wherein ScFor the computation load, the KqIs the starting current multiple, K is a conversion factor, PmAnd n is the number of the combustion engine units.
The implementation principle and technical effect of the computer-readable storage medium provided by this embodiment are similar to those of the above-described method embodiment, and are not described herein again.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware instructions of a computer program, which can be stored in a non-volatile computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. Any reference to memory, storage, database, or other medium used in the embodiments provided herein may include non-volatile and/or volatile memory, among others. Non-volatile memory can include read-only memory (ROM), Programmable ROM (PROM), Electrically Programmable ROM (EPROM), Electrically Erasable Programmable ROM (EEPROM), or flash memory. Volatile memory can include Random Access Memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms such as Static RAM (SRAM), Dynamic RAM (DRAM), Synchronous DRAM (SDRAM), Double Data Rate SDRAM (DDRSDRAM), Enhanced SDRAM (ESDRAM), Synchronous Link DRAM (SLDRAM), Rambus Direct RAM (RDRAM), direct bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. The capacity determination method of the generator is characterized in that the generator is connected with the variable frequency starting device and is used for black-starting a gas turbine unit of a power grid; the method comprises the following steps:
acquiring a calculation load when the gas turbine set is started, wherein the calculation load is the minimum power required when the gas turbine set is started;
acquiring an impact load when a maximum-capacity motor in the gas turbine unit is started according to the calculated load and a preset starting current multiple; the starting current multiple is the multiple between the starting current and the rated current of the maximum-capacity motor in the gas turbine unit when the gas turbine unit is started in a frequency conversion mode;
and determining the capacity of the generator according to the impact load.
2. The method of claim 1, wherein determining the capacity of the generator based on the magnitude of the impact load comprises:
and determining the capacity of the generator according to the impact load and the calculation load, wherein the capacity of the generator is larger than the impact load and larger than the calculation load.
3. The method of claim 2, wherein determining the capacity of the generator based on the magnitude of the impact load and the magnitude of the computational load comprises:
acquiring a capacity selection margin of the generator;
and determining the capacity of the generator according to the capacity selection margin, the impact load and the calculation load.
4. The method according to any one of claims 1-3, further comprising:
acquiring starting power required by starting a maximum-capacity motor in the gas turbine unit;
calculating output voltage drop when the generator starts the gas turbine set with the capacity of the generator according to the capacity of the generator, the starting current multiple, the transient reactance of the generator and the starting power required when the maximum capacity motor is started;
judging whether the output voltage drop is smaller than a preset maximum voltage drop threshold value or not;
and if so, determining the capacity of the generator as the target capacity.
5. The method of claim 4, wherein calculating an output voltage drop of the generator in starting the group of combustion engines at the generator's capacity based on the generator's capacity, the starting current multiple, the generator's transient reactance, and the starting power required to start the maximum capacity motor comprises:
according to the inclusion
Determining said output pressure drop;
wherein, the SeFor the capacity of the generator, the KqIs a multiple of the starting current, PmIs the starting power required when the maximum capacity motor is started, XdIs the transient reactance of the generator.
6. The method of claim 1, wherein the obtaining the computational load at start-up of the group of combustion engines comprises:
according to the formula ScCalculating the calculation load S as K ∑ Pc；
And P is starting power of each target device in the gas turbine unit when being started, and K is a conversion coefficient.
7. The method of claim 1, wherein obtaining the impact load of the maximum-capacity motor in the gas turbine unit during starting according to the calculated load and a preset starting current multiple comprises:
according to the inclusion
Calculating the impact load;
wherein, the ScFor the computation load, the KqIs the starting current multiple, K is a conversion factor, PmAnd n is the number of the combustion engine units.
8. A capacity determining apparatus for a generator, wherein the generator is connected to the variable frequency starting apparatus, and the generator is used for black-starting a gas turbine unit of an electric network, the apparatus comprising:
the calculation load acquisition module is used for acquiring the calculation load when the gas turbine set is started, wherein the calculation load is the minimum power required when the gas turbine set is started;
the impact load obtaining module is used for obtaining the impact load when a maximum-capacity motor in the gas turbine unit is started according to the calculated load and a preset starting current multiple; the starting current multiple is the multiple between the starting current and the rated current of the maximum-capacity motor in the gas turbine unit when the gas turbine unit is started in a frequency conversion mode;
and the capacity determining module is used for determining the capacity of the generator according to the impact load.
9. A computer device comprising a memory and a processor, the memory storing a computer program, characterized in that the processor, when executing, realizes the steps of the method of any of claims 1 to 7.
10. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the method of any one of claims 1 to 7.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111641360A (en) * | 2020-06-11 | 2020-09-08 | 上海外高桥造船有限公司 | Method, device, equipment and medium for obtaining transient voltage drop and starting equipment |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090112374A1 (en) * | 2007-10-30 | 2009-04-30 | General Electric Company | Method and system for power plant block loading |
| CN104578060A (en) * | 2015-01-22 | 2015-04-29 | 中国电力工程顾问集团西北电力设计院有限公司 | Method for selecting black-start diesel engine of SFC self-start gas turbine set |
-
2018
- 2018-09-25 CN CN201811114777.5A patent/CN110943489A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090112374A1 (en) * | 2007-10-30 | 2009-04-30 | General Electric Company | Method and system for power plant block loading |
| CN104578060A (en) * | 2015-01-22 | 2015-04-29 | 中国电力工程顾问集团西北电力设计院有限公司 | Method for selecting black-start diesel engine of SFC self-start gas turbine set |
Non-Patent Citations (2)
| Title |
|---|
| 周波: "燃机电厂黑起动柴油发电机组选择", 《电气时代》 * |
| 国家能源局: "《火力发电厂厂用电设计技术规程DL/T 5153-2014》", 15 October 2014, 中国计划出版社 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111641360A (en) * | 2020-06-11 | 2020-09-08 | 上海外高桥造船有限公司 | Method, device, equipment and medium for obtaining transient voltage drop and starting equipment |
| CN111641360B (en) * | 2020-06-11 | 2023-07-25 | 上海外高桥造船有限公司 | Method and device for obtaining transient voltage drop and starting equipment, equipment and medium |
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