CN116505812A - Output power control method, system, device, storage medium and direct current generator set - Google Patents
Output power control method, system, device, storage medium and direct current generator set Download PDFInfo
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- CN116505812A CN116505812A CN202310465613.1A CN202310465613A CN116505812A CN 116505812 A CN116505812 A CN 116505812A CN 202310465613 A CN202310465613 A CN 202310465613A CN 116505812 A CN116505812 A CN 116505812A
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- 238000000034 method Methods 0.000 title claims abstract description 40
- 238000004804 winding Methods 0.000 claims description 13
- 238000004590 computer program Methods 0.000 claims description 9
- 238000010248 power generation Methods 0.000 claims 1
- 230000001276 controlling effect Effects 0.000 description 19
- 230000000875 corresponding effect Effects 0.000 description 11
- 230000009467 reduction Effects 0.000 description 5
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical group [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 229910052710 silicon Inorganic materials 0.000 description 4
- 239000010703 silicon Substances 0.000 description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000011217 control strategy Methods 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
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- 238000004146 energy storage Methods 0.000 description 2
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Classifications
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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
- H02P9/14—Arrangements for controlling electric generators for the purpose of obtaining a desired output by variation of field
- H02P9/26—Arrangements for controlling electric generators for the purpose of obtaining a desired output by variation of field using discharge tubes or semiconductor devices
- H02P9/30—Arrangements for controlling electric generators for the purpose of obtaining a desired output by variation of field using discharge tubes or semiconductor devices using semiconductor devices
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
- H02K7/18—Structural association of electric generators with mechanical driving motors, e.g. with turbines
- H02K7/1807—Rotary generators
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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
- H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
- H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
- H02P27/06—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters
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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
- H02P9/02—Details
Abstract
The application discloses an output power control method, an output power control system, an output power control device, a storage medium and a direct current generator set, wherein the current altitude of the direct current generator set and the current target output power of the direct current generator set are obtained; determining the current maximum power which can be output by the direct current generator set based on the altitude; judging whether the direct current generator set currently meets the high-altitude output power control condition or not based on the maximum output power and the target output power; and under the condition that the direct current generator set currently meets the high-altitude output power control condition, controlling the output voltage of the three-phase controllable rectifying circuit so that the actual output power of the direct current generator set does not exceed the maximum output power. The method can effectively ensure that the engine rotating speed of the direct current generator set is not passively reduced due to overlarge output power under the high-altitude environment, so that the engine can release the maximum power under the high-altitude environment.
Description
Technical Field
The present disclosure relates to the field of generator sets, and in particular, to a method, a system, a device, a storage medium, and a dc generator set for controlling output power.
Background
A generator set is a complete set of mechanical equipment that converts other forms of energy into electrical energy. The direct current generator set using fuel to provide energy mainly comprises an engine, a generator and a rectifying module, wherein the engine is in driving connection with the generator through a crankshaft, the output end of the generator is connected with the input end of the rectifying module, the engine drives the generator to rotate through the crankshaft so as to enable the generator to output three-phase alternating current, and the rectifying module converts the three-phase alternating current output by the generator into direct current to directly supply power for a load or supplies power for the load after power conversion (DC-DC conversion or DC-AC inversion).
The storage battery is used as an energy storage device and widely applied to a power supply system, for example, in some areas with low commercial power (such as some high-altitude areas), and is generally used as an energy storage power supply to supply power for a work load. In an application environment in which a storage battery is used for supplying power to a work load, a direct-current generator set is generally used for providing a direct-current charging voltage for the storage battery to charge so as to prolong the endurance time of the storage battery. The charging power of the battery is generally small and can be appropriately adjusted within a certain range.
When the dc generator set is used in a high altitude environment, as the altitude increases, the atmospheric pressure and air density relatively decrease, and the engine may decrease in output power at the same rotational speed due to the low oxygen content of the air at the high altitude, which may result in insufficient engine power.
Because the direct current generator set directly supplies power to the direct current load (for example, charges a storage battery) after rectification through the rectification module, the output voltage, the output power and the rotating speed of the direct current generator set are positively correlated, when the power of the engine is insufficient, the rotating speed of the engine can be passively reduced, the voltage of the output voltage of the generator can be reduced after rectification through the rectification module, the output power of the generator is further reduced, the required voltage of the load needs to be correspondingly reduced at the moment, the reduction of the required voltage of the load requires the engine to reduce the rotating speed in the opposite direction, and vicious circulation is formed in a reciprocating mode until the output power of the generator and the output power of the engine reach a certain balance point, and finally the output power of the direct current generator set is extremely low.
As shown in fig. 1, which is a graph of the relation between the engine speed and the power of the generator and is a graph of the relation between the engine speed and the power of the generator, as shown in fig. 1, it is known that when the altitude of the dc generator set is below 200m (low altitude environment), the outputtable power of the engine is greater than the actual output power of the generator at the same speed, and when the dc generator set is at the altitude of 4000m (high altitude environment), the outputtable power of the engine is greatly reduced and is lower than the actual output power of the generator at the same speed, at this time, the engine speed is passively reduced until the output power of the generator and the outputtable power of the engine reach a certain balance point (i.e. the leftward extension line of the generator speed-power curve and the leftward extension line of the engine speed-power curve, at this time, the engine speed is extremely low (typically only several hundred rpm), which results in extremely low output power of the dc generator set), on one hand, the engine cannot release the maximum power, even abnormal conditions such as speed fluctuation or flameout occur due to overload, on the other hand, the load may work extremely low power or not work normally.
Therefore, how to make the direct current generator set not to cause the passive reduction of the engine rotation speed due to the overlarge output power in the high altitude environment is a problem to be solved at present.
Disclosure of Invention
In order to solve the technical problems, the application provides an output power control method, an output power control system, an output power control device, a storage medium and a direct current generator set, which can effectively ensure that the direct current generator set can not cause the passive reduction of the engine rotating speed due to overlarge output power in a high-altitude environment, so that the engine can release the maximum power in the high-altitude environment.
A first object of the present application is to provide an output power control method.
The first object of the present application is achieved by the following technical solutions:
the output power control method is applied to a direct current generator set, the direct current generator set comprises an engine, a generator and a rectification module, the engine is in driving connection with the generator through a crankshaft, the rectification module comprises a three-phase controllable rectification circuit, three-phase windings of the generator are connected with a power input end of the three-phase controllable rectification circuit, and a power output end of the three-phase controllable rectification circuit is used for being connected with a direct current load to supply power for the direct current load;
The output power control method includes:
acquiring the current altitude of the direct current generator set and the current target output power of the direct current generator set, wherein the target output power is determined by the current required power of a direct current load connected to the power output end of the three-phase controllable rectifying circuit;
determining the current maximum power which can be output by the direct current generator set based on the altitude, wherein the maximum power which can be output is the output power of the direct current generator set of the engine at the rated rotating speed at the current altitude;
judging whether the direct current generator set currently meets a high-altitude output power control condition or not based on the maximum output power and the target output power;
and under the condition that the direct current generator set currently meets the high-altitude output power control condition, controlling the output voltage of the three-phase controllable rectifying circuit so that the actual output power of the direct current generator set does not exceed the maximum outputtable power.
Preferably, the determining whether the dc generator set currently satisfies a high altitude output power control condition based on the maximum outputtable power and the target output power includes:
Comparing the maximum power which can be output with the target output power, and judging that the direct current generator set currently meets the high-altitude output power control condition under the condition that the maximum power which can be output is smaller than the target output power.
Preferably, the controlling the output voltage of the three-phase controllable rectifying circuit in the case that it is determined that the dc generator set currently satisfies the high altitude output power control condition includes:
and controlling the on-off frequency of a controllable rectifying element in the three-phase controllable rectifying circuit based on the relation between the maximum output power and the target output power so as to regulate the output voltage of the three-phase controllable rectifying circuit.
Preferably, the controlling the on-off frequency of the controllable rectifying element in the three-phase controllable rectifying circuit based on the relation between the maximum power capable of being output and the target output power includes:
and controlling the on-off frequency of a controllable rectifying element in the three-phase controllable rectifying circuit based on the ratio of the maximum power to the target output power, so that the ratio of the total on-time of each phase of the three-phase controllable rectifying circuit to the total on-off time of each phase of the three-phase controllable rectifying circuit in each preset control period is equal to or smaller than the ratio of the maximum power to the target output power.
Preferably, the determining the current maximum power that can be output by the dc generator set based on the altitude comprises:
searching a power derating coefficient of the direct current generator set corresponding to the altitude in a pre-calibrated altitude-generator set power derating coefficient relation table based on the altitude;
and determining the current maximum power which can be output by the direct current generator set according to the searched power derating coefficient.
Preferably, the three-phase controllable rectifying circuit is a three-phase full-bridge half-controlled rectifying circuit, and the controllable rectifying element in the three-phase controllable rectifying circuit is a silicon controlled rectifier.
A second object of the present application is to provide an output power control system.
The second object of the present application is achieved by the following technical solutions:
the output power control system is applied to a direct current generator set, the direct current generator set comprises an engine, a generator and a rectification module, the engine is in driving connection with the generator through a crankshaft, the rectification module comprises a three-phase controllable rectification circuit, three-phase windings of the generator are connected with a power input end of the three-phase controllable rectification circuit, and a power output end of the three-phase controllable rectification circuit is used for being connected with a direct current load to supply power for the direct current load;
The output power control system includes:
the information acquisition module is used for acquiring the current altitude of the direct current generator set and the current target output power of the direct current generator set, wherein the target output power is determined by the current required power of a direct current load connected to the power output end of the three-phase controllable rectifying circuit;
the maximum power determining module is used for determining the current maximum power which can be output by the direct current generator set based on the altitude, wherein the maximum power which can be output is the output power of the direct current generator set of the engine at the rated rotation speed at the current altitude;
the control condition judging module is used for judging whether the direct current generator set currently meets the high-altitude output power control condition or not based on the maximum output power and the target output power;
and the output power control module is used for controlling the output voltage of the three-phase controllable rectifying circuit under the condition that the direct-current generator set currently meets the high-altitude output power control condition so that the actual output power of the direct-current generator set does not exceed the maximum outputtable power.
Preferably, the control condition judgment module is specifically configured to:
comparing the maximum power which can be output with the target output power, and judging that the direct current generator set currently meets the high-altitude output power control condition under the condition that the maximum power which can be output is smaller than the target output power.
Preferably, the output power control module is specifically configured to:
and controlling the on-off frequency of a controllable rectifying element in the three-phase controllable rectifying circuit based on the relation between the maximum output power and the target output power so as to regulate the output voltage of the three-phase controllable rectifying circuit.
Preferably, the output power control module is specifically configured to, when executing the step of controlling the on-off frequency of the controllable rectifying element in the three-phase controllable rectifying circuit based on the relationship between the maximum power capable of being output and the target output power:
and controlling the on-off frequency of a controllable rectifying element in the three-phase controllable rectifying circuit based on the ratio of the maximum power to the target output power, so that the ratio of the total on-time of each phase of the three-phase controllable rectifying circuit to the total on-off time of each phase of the three-phase controllable rectifying circuit in each preset control period is equal to or smaller than the ratio of the maximum power to the target output power.
Preferably, the maximum power determining module is specifically configured to:
searching a power derating coefficient of the direct current generator set corresponding to the altitude in a pre-calibrated altitude-generator set power derating coefficient relation table based on the altitude;
and determining the current maximum power which can be output by the direct current generator set according to the searched power derating coefficient.
Preferably, the three-phase controllable rectifying circuit is a three-phase full-bridge half-controlled rectifying circuit, and the controllable rectifying element in the three-phase controllable rectifying circuit is a silicon controlled rectifier.
A third object of the present application is to provide an output power control apparatus.
The third object of the present application is achieved by the following technical solutions:
an output power control apparatus comprising:
a memory, a processor and a computer program stored in the memory and executable on the processor, the processor implementing the steps of the output power control method according to any one of the first objects of the present application when the computer program is executed.
A fourth object of the present application is to provide a computer-readable storage medium.
The fourth object of the present application is achieved by the following technical solutions:
A computer-readable storage medium storing a computer program which, when executed by a processor, implements the steps of the output power control method of any one of the first objects of the present application.
It is a fifth object of the present application to provide a dc power generating set.
The fifth application object of the present application is achieved by the following technical solutions:
a dc power generating set comprising an output power control device according to the third object of the present application.
As can be seen from the foregoing, the present application discloses an output power control method, when the output power of a dc generator set needs to be controlled, firstly obtaining the current altitude of the dc generator set and the current target output power of the dc generator set, where the target output power is determined by the current required power of a dc load connected to the power output end of the three-phase controllable rectifying circuit; then determining the current maximum power which can be output by the direct current generator set based on the altitude, wherein the maximum power which can be output is the output power of the direct current generator set of the engine at the rated rotating speed under the current altitude; then judging whether the direct current generator set currently meets a high-altitude output power control condition or not based on the maximum output power and the target output power; and finally, under the condition that the direct current generator set currently meets the high-altitude output power control condition, controlling the output voltage of the three-phase controllable rectifying circuit so that the actual output power of the direct current generator set does not exceed the maximum outputtable power.
According to the method and the device, the output voltage of the three-phase controllable rectifying circuit of the rectifying module is controlled according to the corresponding maximum output power of the direct-current generator set at the current altitude, so that the actual output power of the direct-current generator set does not exceed the maximum output power of the direct-current generator set at the current altitude, the direct-current generator set can be effectively ensured not to be passively reduced in engine rotation speed due to overlarge output power in a high-altitude environment, and the engine can release the maximum power in the high-altitude environment.
The application also provides an output power control system, an output power control device, a storage medium and a direct current generator set, which have the same technical effects.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments described in the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a graph of engine speed-power versus generator speed-power for a DC genset;
Fig. 2 is a flow chart of an output power control method in an embodiment of the present application;
FIG. 3 is a schematic diagram of an output power control circuit of a DC generator set according to an embodiment of the present application;
fig. 4 is a schematic structural diagram of an output power control system according to an embodiment of the present application;
fig. 5 is a schematic structural diagram of an output power control device in an embodiment of the present application.
Detailed Description
In order to better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below, and it is obvious that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.
In the embodiments provided in the present application, it should be understood that the disclosed method and system may be implemented in other manners. The system embodiments described below are merely illustrative, and for example, the division of units and modules is merely a logical function division, and other divisions may be implemented in practice such as: multiple units or modules may be combined or may be integrated into another system, or some features may be omitted, or not performed. In addition, the various components shown or discussed may be coupled or directly coupled or communicatively coupled to each other via some interface, whether indirectly coupled or communicatively coupled to devices or modules, whether electrically, mechanically, or otherwise.
In addition, each functional unit in each embodiment of the present application may be integrated in one processor, or each unit may be separately used as one device, or two or more units may be integrated in one device; the functional units in the embodiments of the present application may be implemented in hardware, or may be implemented in a form of hardware plus a software functional unit.
Those of ordinary skill in the art will appreciate that: all or part of the steps of implementing the method embodiments described below may be performed by program instructions and associated hardware, and the foregoing program instructions may be stored in a computer readable storage medium, which when executed, perform steps comprising the method embodiments described below; and the aforementioned storage medium includes: a mobile storage device, a Read Only Memory (ROM), a magnetic disk or an optical disk, or the like, which can store program codes.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, the meaning of "a plurality" or "a number" is two or more, unless explicitly defined otherwise.
As shown in fig. 2, the embodiment of the application provides an output power control method, which is applied to a direct current generator set, wherein the direct current generator set comprises an engine, a generator and a rectification module, the engine is in driving connection with the generator through a crankshaft, the rectification module comprises a three-phase controllable rectification circuit, a three-phase winding of the generator is connected with a power input end of the three-phase controllable rectification circuit, and a power output end of the three-phase controllable rectification circuit is used for connecting a direct current load to supply power for the direct current load;
the output power control method includes:
s1, acquiring the current altitude of a direct current generator set and the current target output power of the direct current generator set;
in the power supply system for directly supplying power to the direct current load by outputting the direct current voltage after rectification of the direct current generator set, under the condition that the direct current generator set is in a high altitude environment, the engine can reduce the output power at the same rotating speed due to the low oxygen content of the air at the high altitude, so that the engine power is insufficient to passively reduce the speed of the engine, the output power of the generator and the output power of the engine reach a certain balance point, and finally the output power of the direct current generator set is extremely low to influence the normal operation of the power supply system. Therefore, in order to avoid the problem that the engine passively slows down due to the fact that the output power of the direct current generator set is too high (namely, the output power of the direct current generator set is larger than the current maximum power which can be output by the engine), the output power of the direct current generator set needs to be controlled in a targeted mode in a high-altitude environment.
Therefore, when the output power of the dc generator set needs to be controlled, the current altitude of the dc generator set and the current target output power of the dc generator set need to be obtained first.
Specifically, in this embodiment, when the current altitude of the dc generator set is obtained, the current altitude of the dc generator set may be determined according to the atmospheric pressure of the current environment, which specifically includes the following steps:
firstly, acquiring the atmospheric pressure under the current environment detected by an air pressure sensor arranged on a direct current generator set;
and then searching the altitude corresponding to the atmospheric pressure in the current environment from a pre-calibrated atmospheric pressure-altitude relation table in a table look-up mode according to the acquired atmospheric pressure. Specifically, the barometric pressure-altitude relationship table may be calibrated in the engine ECU in advance before the dc generator set is shipped.
Specifically, the target output power is determined by the current required power of the dc load connected to the power output end of the three-phase controllable rectifying circuit, for example, in a power supply system using a battery as the dc load, since the charging power of the battery varies correspondingly under the condition of different electric quantities, a battery management system (BMS system) for managing the charging power of the battery determines the current charging power of the battery according to the current electric quantity of the battery, where the current charging power of the battery is the current required power, and to enable the battery to be charged with the current charging power, it is necessary to ensure that the current output power of the dc generator set (i.e., the target output power) is equivalent to the current charging power of the battery, so in this embodiment, the target output power may be set to be equal to the current required power of the dc load.
S2, determining the current maximum power which can be output by the direct current generator set based on the altitude;
after the current altitude of the direct-current generator set is obtained, determining the current maximum power which can be output by the direct-current generator set according to the altitude.
Specifically, the maximum power output can be the output power of the direct current generator set of the engine at the rated rotation speed under the current altitude.
In one embodiment, the current maximum power which can be output by the direct current generator set can be determined according to the altitude by the following method:
firstly, searching a power derating coefficient of a direct current generator set corresponding to the altitude in a pre-calibrated altitude-generator set power derating coefficient relation table based on the altitude;
because the oxygen content in the air is different under different altitudes, the output power (the maximum power which can be output) of the direct current generator set can change with the altitude at the rated rotation speed, so that the ratio between the maximum power which can be output of the direct current generator set under different altitudes and the maximum power which can be output of the direct current generator set calibrated in advance under the low altitude environment can change, and accordingly, the power derating coefficient of the direct current generator set under different altitudes can be calibrated, and therefore, an altitude-generator set power derating coefficient relation table can be calibrated, and in the altitude-generator set power derating coefficient relation, different altitude ranges correspond to different generator set power derating coefficients one by one.
Specifically, the altitude-generator set power derating coefficient relationship table may be calibrated in the engine ECU in advance before the dc generator set leaves the factory.
And then, determining the current maximum power which can be output by the direct-current generator set according to the searched power derating coefficient.
After the power derating coefficient of the direct-current generator set corresponding to the altitude is found in the altitude-generator set power derating coefficient relation table, the current maximum power which can be output by the direct-current generator set can be calculated according to the power derating coefficient and the pre-calibrated maximum power which can be output by the direct-current generator set in the low altitude environment.
S3, judging whether the direct current generator set currently meets the high-altitude output power control condition or not based on the maximum output power and the target output power;
after the current maximum outputtable power of the direct-current generator set is obtained, whether the direct-current generator set needs to perform high-altitude output power control or not needs to be judged, and specifically whether the direct-current generator set currently meets the high-altitude output power control condition or not needs to be judged according to the maximum outputtable power and the target output power.
Specifically, in one embodiment, the following method may be adopted to determine whether the dc generator set currently satisfies the high altitude output power control condition based on the maximum outputtable power and the target output power:
comparing the maximum power which can be output with the target output power, and if the maximum power which can be output is smaller than the target output power, judging that the direct current generator set currently meets the high-altitude output power control condition.
It can be understood that when the maximum power that can be output is smaller than the target output power, it indicates that the maximum power that can be output of the dc generator set cannot reach the target output power due to power deration at the altitude, that is, the engine power is insufficient, at this time, if the actual output power of the dc generator set is not adjusted, the engine will be passively slowed down, the voltage of the output voltage of the generator will be reduced after being rectified by the rectifying module, and then the output power of the generator will be reduced, at this time, the required voltage of the load needs to be correspondingly reduced, the reduction of the required voltage of the load will reversely require the engine to reduce the rotation speed, so that a vicious circle is formed, until the output power of the generator and the output power of the engine reach a certain balance point, and finally the output power of the dc generator set is extremely low. Therefore, when the maximum power which can be output is smaller than the target output power, the direct current generator set is judged to currently meet the high-altitude output power control condition, and then the high-altitude output power control strategy is executed.
And S4, under the condition that the direct-current generator set currently meets the high-altitude output power control condition, controlling the output voltage of the three-phase controllable rectifying circuit so that the actual output power of the direct-current generator set does not exceed the maximum output power.
In order to prevent the engine from entering a vicious circle of passive deceleration, under the condition that the current high-altitude output power control condition of the direct-current generator set is met, the actual output power of the direct-current generator set needs to be controlled, and specifically, the output voltage of the three-phase controllable rectifying circuit is controlled so that the actual output power of the direct-current generator set does not exceed the maximum output power.
The direct current generator set directly generates power for direct current through the power output end of the three-phase controllable rectifying circuit, so that the actual output power of the direct current generator set is controlled by controlling the output voltage of the three-phase controllable rectifying circuit, and the actual output power of the direct current generator set is enabled not to exceed the maximum power which can be output after the power of the generator set is reduced in the high-altitude environment in a mode of actively reducing the actual output power of the direct current generator set, and the passive speed reduction of an engine is avoided.
It should be noted that, in the output power control strategy in this embodiment, in order to make the actual output power of the dc power generator set not exceed the maximum power that can be output after the power of the power generator set is reduced in the high altitude environment, the dc power generator set is actively controlled to reduce the actual output power, so in this embodiment, the dc load connected to the power output end of the three-phase controllable rectifying circuit of the dc power generator set needs to have a certain power variation adaptive capacity, that is, the dc load needs to be a load that can normally work in a certain power variation range, such as a storage battery.
In summary, in the above embodiment, when the output power of the dc generator set needs to be controlled, the current altitude of the dc generator set and the current target output power of the dc generator set are first obtained; then determining the current maximum power which can be output by the direct current generator set based on the altitude; then judging whether the direct current generator set currently meets the high altitude output power control condition or not based on the maximum output power and the target output power; and finally, under the condition that the direct current generator set currently meets the high-altitude output power control condition, controlling the output voltage of the three-phase controllable rectifying circuit so that the actual output power of the direct current generator set does not exceed the maximum output power.
According to the embodiment, the output voltage of the three-phase controllable rectifying circuit of the rectifying module is controlled according to the corresponding maximum output power of the direct-current generator set at the current altitude, so that the actual output power of the direct-current generator set does not exceed the maximum output power of the direct-current generator set at the current altitude, the direct-current generator set can be effectively ensured not to be passively lowered due to overlarge output power in a high-altitude environment, and the engine can release the maximum power in the high-altitude environment.
According to the embodiment, the output voltage of the three-phase controllable rectifying circuit is controlled under the condition that the direct-current generating set currently meets the high-altitude output power control condition, so that the output power of the direct-current generating set is controlled, the actual output power of the direct-current generating set does not exceed the maximum output power, and therefore the direct-current voltage rectified and output by the direct-current generating set can directly supply power to a direct-current load without setting a DC-DC power supply conversion module between the rectifying module and the direct-current load to stabilize the output voltage of the direct-current generating set, and cost is effectively reduced.
Specifically, in one embodiment, the control of the output voltage of the three-phase controllable rectifying circuit may be based on a relationship between the maximum power that can be output and the target output power, and the on-off frequency of the controllable rectifying element in the three-phase controllable rectifying circuit is controlled to adjust the output voltage of the three-phase controllable rectifying circuit.
In one embodiment, further, based on the relationship between the maximum power that can be output and the target output power, controlling the on-off frequency of the controllable rectifying element in the three-phase controllable rectifying circuit may specifically include:
and controlling the on-off frequency of the controllable rectifying element in the three-phase controllable rectifying circuit based on the ratio of the maximum power to the target output power, so that the ratio of the total on-time of each phase of the three-phase controllable rectifying circuit to the total on-off time of each phase of the three-phase controllable rectifying circuit in each preset control period is equal to or smaller than the ratio of the maximum power to the target output power.
Specifically, the preset control period may be specifically set according to specific situations such as a ratio of the maximum power to the target output power, the number of groups of three-phase windings of the generator of the direct current generator set, and the pole pair number of magnetic shoes of the generator, and the preset control period may be specifically set to be an integer multiple of time required for one revolution of the engine.
Specifically, as shown in fig. 3, in one embodiment, the three-phase controllable rectifying circuit is a three-phase full-bridge half-control rectifying circuit. Therefore, the output voltage of the three-phase controllable rectifying circuit can be regulated, the requirement for controlling the output power of the direct-current generator set is met, and meanwhile, compared with the three-phase fully-controlled rectifying circuit, the number of controllable rectifying elements can be reduced, so that the cost is reduced.
Further, as shown in fig. 3, in one embodiment, the controllable rectifying element in the three-phase full-bridge half-control rectifying circuit adopts a silicon controlled rectifier, which has advantages of small heat productivity and long service life compared with a switching device such as a field effect transistor.
In this embodiment, when the output power of the dc generator set is controlled, the on-off frequency of the thyristors in the three-phase full-bridge half-controlled rectifier circuit is controlled according to the ratio of the maximum power to the target output power, so that the ratio of the total on-time of each phase in the three-phase full-bridge half-controlled rectifier circuit to the total on-off time of each phase in the three-phase controllable rectifier circuit is equal to or less than the ratio of the maximum power to the target output power in each preset control period.
The output power control method in the embodiment is applicable to a direct current generator set with one or more groups of three-phase windings. As shown in fig. 3, an output power control circuit schematic diagram of a dc generator set with n groups of three-phase windings (n is a positive integer), where each group of three-phase windings has the same magnitude of U, V, W three-phase coils and 120 ° phase difference, each group of three-phase windings is connected to a three-phase full-bridge half-control rectifying circuit, and power output ends of the three-phase full-bridge half-control rectifying circuits are connected in parallel to supply power to a dc load, and control poles Gu, gv and Gw of three thyristors in each three-phase full-bridge half-control rectifying circuit are respectively connected with control signal output ends corresponding to an MCU, and the MCU outputs corresponding control signals to individually control switching frequency of each thyristor in each three-phase full-bridge half-control rectifying circuit to stepwise control output voltage of each three-phase full-bridge half-control rectifying circuit according to a ratio of maximum output power to target output power, so as to control actual output power of the dc generator set, so that the actual output power of the dc generator set does not exceed the maximum output power of the dc generator set under the current altitude.
It should be noted that, when the output power control circuit of the dc generator set shown in fig. 3 is adopted and it is determined that the current dc generator set does not meet the high altitude output power control condition, that is, the maximum output power is greater than or equal to the target output power, the high altitude output power control strategy is not required to be started, and at this time, all the thyristors in each three-phase full-bridge half-control rectifying circuit are controlled by the MCU to be fully turned on.
The operation principle of the output power control method in the above embodiment will be described below with reference to the output power control circuit of the dc power generating set shown in fig. 3 as a specific example (taking a generator having a set of three-phase windings (i.e., generator three-phase winding 1) as an example):
let current maximum power of the direct current generator set be Q1, and current target output power of the direct current generator set be Q2, then:
when Q1 is greater than Q2, in each preset control period, the control poles Gu1, gv1 and Gw1 of three thyristors of the three-phase full-bridge half-controlled rectifying circuit (namely three-phase controllable rectifying 1 in FIG. 3) are kept fully open by uniformly and directly outputting high level through the control signal output ends Gu1, gv1 and Gw1 of the MCU;
when Q1 < Q2, in each preset control period, the MCU adjusts the duty ratio of the high level and the low level of the control signal output ends Gu1, gv1, gw1 according to the ratio of Q1/Q2 to keep the high level of the control poles Gu1, gv1, gw1 of the three thyristors of the three-phase full-bridge half-controlled rectifying circuit (i.e., the three-phase controllable rectifying 1 in fig. 3).
Assuming q1=8kw, q2=10kw, q1/q2=0.8=80%;
the MCU controls the switching frequencies of the control poles Gu1, gv1, gw1 of the three thyristors to be kept at a high level in a proportion of 80% or less than 80%.
Assuming that the preset control period is 5 times of the time required by one engine turn, namely, the engine turns 5 times of the preset control period, at this time, the control poles Gu1, gv1 and Gw1 of the three thyristors can be controlled to keep high level at any 4 times (the time of the remaining 1 turn is low level) respectively in the preset control period corresponding to the time required by the engine turns 5 times; or the control electrode (e.g. Gu 1) of one of the thyristors is controlled to be kept low for any 3 turns, the remaining 2 turns are kept high, and the control electrodes (Gv 1, gw 1) of the other two thyristors are kept high for all 5 turns. In summary, it is only necessary that the ratio of the total on time of each phase in the three-phase full-bridge half-controlled rectifying circuit to the total on time of each phase in the three-phase controllable rectifying circuit is equal to or less than the ratio (80%) of the maximum power that can be output to the target output power in each preset control period.
As shown in fig. 4, an embodiment of the present application provides an output power control system, which is applied to a dc generator set, where the dc generator set includes an engine, a generator and a rectification module, the engine is in driving connection with the generator through a crankshaft, the rectification module includes a three-phase controllable rectification circuit, a three-phase winding of the generator is connected with a power input end of the three-phase controllable rectification circuit, and a power output end of the three-phase controllable rectification circuit is used to connect a dc load to supply power to the dc load;
The output power control system includes:
the information acquisition module 201 is configured to acquire a current altitude of the dc generator set and a current target output power of the dc generator set, where the target output power is determined by a current required power of a dc load connected to a power output end of the three-phase controllable rectifying circuit;
the maximum power determining module 202 is configured to determine a current maximum power that can be output by the dc generator set based on the altitude, where the maximum power that can be output is an output power of the dc generator set of the engine at a rated rotational speed at the current altitude;
the control condition judging module 203 is configured to judge whether the dc generator set currently meets the high altitude output power control condition based on the maximum power that can be output and the target output power;
and the output power control module 204 is configured to control the output voltage of the three-phase controllable rectifying circuit when it is determined that the dc generator set currently meets the high altitude output power control condition, so that the actual output power of the dc generator set does not exceed the outputtable maximum power.
In one embodiment, the control condition determining module 203 is specifically configured to:
comparing the maximum power which can be output with the target output power, and judging that the direct current generator set currently meets the high-altitude output power control condition under the condition that the maximum power which can be output is smaller than the target output power.
In one embodiment, the output power control module 204 is specifically configured to:
based on the relation between the maximum power and the target output power, the on-off frequency of the controllable rectifying element in the three-phase controllable rectifying circuit is controlled to regulate the output voltage of the three-phase controllable rectifying circuit.
In one embodiment, the output power control module is specifically configured to, when executing the step of controlling the on-off frequency of the controllable rectifying element in the three-phase controllable rectifying circuit based on the relationship between the maximum power that can be output and the target output power:
and controlling the on-off frequency of the controllable rectifying element in the three-phase controllable rectifying circuit based on the ratio of the maximum power to the target output power, so that the ratio of the total on-time of each phase of the three-phase controllable rectifying circuit to the total on-off time of each phase of the three-phase controllable rectifying circuit in each preset control period is equal to or smaller than the ratio of the maximum power to the target output power.
In one embodiment, the maximum power determination module 202 is specifically configured to:
searching a power derating coefficient of the direct current generator set corresponding to the altitude in a pre-calibrated altitude-generator set power derating coefficient relation table based on the altitude;
And determining the current maximum power which can be output by the direct-current generator set according to the searched power derating coefficient.
In one embodiment, the three-phase controllable rectifying circuit is a three-phase full-bridge half-controlled rectifying circuit, and the controllable rectifying element in the three-phase controllable rectifying circuit is a silicon controlled rectifier.
The output power control system in the above embodiment has the same working principle and beneficial effects as those of the output power control method in the above embodiment, and will not be described herein.
As shown in fig. 5, the embodiment of the present application provides an output power control apparatus 3, which includes a memory 301, a processor 302, and a computer program 303 stored in the memory 301 and executable on the processor 302, and the steps of the output power control method according to the above-described method embodiment of the present application are implemented when the processor 302 executes the computer program 303.
Specifically, the output power control device 3 may be an intelligent device including a memory and a processor, such as an industrial personal computer, a PC, or an intelligent mobile terminal, or may be a computer component including a memory and a processor, such as a CPU or a GPU, or may be a control component of a dc power generator set, for example, an engine ECU or a generator ECU of the dc power generator set.
The present application provides a computer readable storage medium storing a computer program which when executed by a processor implements the steps of an output power control method according to the above-described method embodiments of the present application.
The embodiment of the application provides a direct current generator set, which comprises an output power control device in the embodiment of the application. Specifically, in this embodiment, the output power control device is an engine ECU.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant points refer to the description of the method section.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative elements and steps are described above generally in terms of functionality in order to clearly illustrate the interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. The software modules may be disposed in Random Access Memory (RAM), memory, read Only Memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. The output power control method is applied to a direct current generator set, the direct current generator set comprises an engine, a generator and a rectifying module, and the engine is in driving connection with the generator through a crankshaft, and is characterized in that:
The rectification module comprises a three-phase controllable rectification circuit, a three-phase winding of the generator is connected with a power input end of the three-phase controllable rectification circuit, and a power output end of the three-phase controllable rectification circuit is used for connecting a direct current load to supply power for the direct current load;
the output power control method includes:
acquiring the current altitude of the direct current generator set and the current target output power of the direct current generator set, wherein the target output power is determined by the current required power of a direct current load connected to the power output end of the three-phase controllable rectifying circuit;
determining the current maximum power which can be output by the direct current generator set based on the altitude, wherein the maximum power which can be output is the output power of the direct current generator set of the engine at the rated rotating speed at the current altitude;
judging whether the direct current generator set currently meets a high-altitude output power control condition or not based on the maximum output power and the target output power;
and under the condition that the direct current generator set currently meets the high-altitude output power control condition, controlling the output voltage of the three-phase controllable rectifying circuit so that the actual output power of the direct current generator set does not exceed the maximum outputtable power.
2. The output power control method according to claim 1, wherein the determining whether the dc generator set currently satisfies a high altitude output power control condition based on the outputtable maximum power and the target output power includes:
comparing the maximum power which can be output with the target output power, and judging that the direct current generator set currently meets the high-altitude output power control condition under the condition that the maximum power which can be output is smaller than the target output power.
3. The output power control method according to claim 2, wherein the controlling the output voltage of the three-phase controllable rectifying circuit in the case where it is determined that the dc power generation unit currently satisfies the high-altitude output power control condition includes:
and controlling the on-off frequency of a controllable rectifying element in the three-phase controllable rectifying circuit based on the relation between the maximum output power and the target output power so as to regulate the output voltage of the three-phase controllable rectifying circuit.
4. The output power control method according to claim 3, wherein the controlling the on-off frequency of the controllable rectifying element in the three-phase controllable rectifying circuit based on the relation between the maximum power that can be output and the target output power includes:
And controlling the on-off frequency of a controllable rectifying element in the three-phase controllable rectifying circuit based on the ratio of the maximum power to the target output power, so that the ratio of the total on-time of each phase of the three-phase controllable rectifying circuit to the total on-off time of each phase of the three-phase controllable rectifying circuit in each preset control period is equal to or smaller than the ratio of the maximum power to the target output power.
5. The output power control method according to any one of claims 1 to 4, wherein the determining the current maximum power that can be output by the dc generator set based on the altitude includes:
searching a power derating coefficient of the direct current generator set corresponding to the altitude in a pre-calibrated altitude-generator set power derating coefficient relation table based on the altitude;
and determining the current maximum power which can be output by the direct current generator set according to the searched power derating coefficient.
6. The method of claim 5, wherein the three-phase controllable rectifying circuit is a three-phase full-bridge half-controlled rectifying circuit, and the controllable rectifying element in the three-phase controllable rectifying circuit is a thyristor.
7. The utility model provides an output control system, is applied to direct current generating set, direct current generating set includes engine, generator and rectifier module, the engine pass through the bent axle with the generator drive is connected, its characterized in that:
the rectification module comprises a three-phase controllable rectification circuit, a three-phase winding of the generator is connected with a power input end of the three-phase controllable rectification circuit, and a power output end of the three-phase controllable rectification circuit is used for connecting a direct current load to supply power for the direct current load;
the output power control system includes:
the information acquisition module is used for acquiring the current altitude of the direct current generator set and the current target output power of the direct current generator set, wherein the target output power is determined by the current required power of a direct current load connected to the power output end of the three-phase controllable rectifying circuit;
the maximum power determining module is used for determining the current maximum power which can be output by the direct current generator set based on the altitude, wherein the maximum power which can be output is the output power of the direct current generator set of the engine at the rated rotation speed at the current altitude;
The control condition judging module is used for judging whether the direct current generator set currently meets the high-altitude output power control condition or not based on the maximum output power and the target output power;
and the output power control module is used for controlling the output voltage of the three-phase controllable rectifying circuit under the condition that the direct-current generator set currently meets the high-altitude output power control condition so that the actual output power of the direct-current generator set does not exceed the maximum outputtable power.
8. An output power control device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, the processor implementing the steps of the output power control method according to any one of claims 1-6 when the computer program is executed.
9. A computer readable storage medium, characterized in that the computer readable storage medium stores a computer program which, when executed by a processor, implements the steps of the output power control method according to any one of claims 1-6.
10. A direct current generator set comprising the output power control apparatus of claim 8.
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| CN202310465613.1A CN116505812A (en) | 2023-04-26 | 2023-04-26 | Output power control method, system, device, storage medium and direct current generator set |
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| CN202310465613.1A CN116505812A (en) | 2023-04-26 | 2023-04-26 | Output power control method, system, device, storage medium and direct current generator set |
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