CN110739676A - Method and device for adjusting direct-current bus voltage - Google Patents
Method and device for adjusting direct-current bus voltage Download PDFInfo
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- CN110739676A CN110739676A CN201910994339.0A CN201910994339A CN110739676A CN 110739676 A CN110739676 A CN 110739676A CN 201910994339 A CN201910994339 A CN 201910994339A CN 110739676 A CN110739676 A CN 110739676A
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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
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
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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
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
- H02J1/10—Parallel operation of dc sources
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- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention provides methods and devices for adjusting direct current bus voltage, wherein the methods comprise the steps of collecting a voltage value of a direct current bus through a converter, receiving a second voltage value of the direct current bus collected by a second converter through a converter, comparing the voltage value with the second voltage value, and adjusting the voltage of the direct current bus according to a comparison result.
Description
Technical Field
The invention relates to the field of electric power, in particular to a method and a device for adjusting direct-current bus voltages.
Background
The method has the advantages that with the rapid growth and utilization of new energy sources such as distributed photovoltaic power generation and electrical energy storage technologies, the energy sources are fully utilized by the access mode of multiple energy sources based on the common direct current bus, and the benefit improvement is obvious.
In view of the above problems in the related art, no effective solution exists at present.
Disclosure of Invention
The embodiment of the invention provides direct current bus voltage adjusting methods and devices, and aims to at least solve the problem that stable control of the voltage of a direct current bus is difficult in the related art due to the fact that the current real-time voltage of the direct current bus is sampled respectively and the difference between the acquired voltage data and the actual real-time voltage of the direct current bus exists.
According to embodiments of the invention, methods for adjusting the voltage of the direct current bus are provided, and the methods comprise the steps of collecting a th voltage value of the direct current bus through a th converter, receiving a second voltage value of the direct current bus collected by a second converter through a th converter, comparing the th voltage value with the second voltage value, and adjusting the voltage of the direct current bus according to the comparison result.
According to another embodiments of the invention, the device for adjusting the voltage of the direct current bus comprises an acquisition module, a receiving module and an adjustment module, wherein the acquisition module is used for acquiring a th voltage value of the direct current bus through a th converter, the receiving module is used for receiving a second voltage value of the direct current bus acquired by a second converter through a th converter, and the adjustment module is used for comparing the th voltage value with the second voltage value and adjusting the voltage of the direct current bus according to a comparison result.
According to further embodiments of the invention, there is further provided storage media having stored thereon a computer program, wherein the computer program is arranged to perform the steps of any of the method embodiments described above when executed.
According to yet another embodiments of the present invention, there is also provided electronic device, comprising a memory having stored therein a computer program and a processor arranged to execute the computer program to perform the steps of any of the method embodiments described above.
According to the invention, the th converter is used for collecting the th voltage value of the direct current bus, the th converter is used for receiving the second voltage value of the direct current bus collected by the second converter, the th voltage value and the second voltage value are compared, and the voltage of the direct current bus is adjusted according to the comparison result, so that the problem that the voltage of the direct current bus is difficult to be stably controlled in a mode that the difference between the collected voltage data and the actual real-time voltage of the direct current bus exists in the process of respectively sampling the current real-time voltage of the direct current bus in the related art is solved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and constitute a part of this application , illustrate embodiments of the invention and together with the description serve to explain the invention without limiting it.
Fig. 1 is a flow chart of a method of adjusting a dc bus voltage according to an embodiment of the invention;
FIG. 2 is a schematic structural diagram of a DC bus voltage stabilization control system according to an embodiment of the invention;
FIG. 3 is a schematic diagram of a time-sequential sampling according to an embodiment of the present invention;
fig. 4 is a block diagram of an apparatus for adjusting dc bus voltage according to an embodiment of the present invention.
Detailed Description
The invention will be described in detail hereinafter with reference to the accompanying drawings in conjunction with embodiments. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
It should be noted that the terms "", "second", etc. in the description and claims of the invention and the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order.
Example 1
In this embodiment, methods for adjusting the dc bus voltage are provided, and fig. 1 is a flowchart of a method for adjusting the dc bus voltage according to an embodiment of the present invention, as shown in fig. 1, the flowchart includes the following steps:
step S102, collecting a voltage value of the direct current bus through an current transformer;
step S104, receiving a second voltage value of the direct current bus collected by the second converter through the th converter;
and step S106, comparing the th voltage value with the second voltage value, and adjusting the voltage of the direct current bus according to the comparison result.
Through the steps S102 to S106, the voltage value of the dc bus is collected by the converter, the converter receives the second voltage value of the dc bus collected by the second converter, the voltage value and the second voltage value are compared, and the voltage of the dc bus is adjusted according to the comparison result, so that the problem that it is difficult to stably control the voltage of the dc bus by sampling the current real-time voltage of the dc bus respectively in a manner that the difference between the collected voltage data and the actual real-time voltage of the dc bus exists in the related art is solved.
Optionally, in an optional implementation manner of this embodiment, the manner of collecting the voltage value of the dc bus through the th converter, which is involved in step S102, may include:
step S102-11, collecting a plurality of voltage values of a direct current bus in a preset time period through an th current transformer;
step S102-12, th average voltage value of the plurality of voltage values in a preset time period is calculated, and the th average voltage value is used as the th voltage value.
Optionally, in an optional implementation manner of this embodiment, the manner, involved in step S104, of receiving, by the th converter, the second voltage value of the dc bus collected by the second converter may include:
step S104-11, receiving a plurality of second voltage values acquired by a plurality of second current transformers through an current transformer, wherein the second voltage values are the average value of the voltage values of the direct current buses acquired by the second current transformers within a preset time period;
and step S104-12, calculating second average voltage values of the plurality of second voltage values relative to the plurality of second current transformers, and taking the second average voltage values as the second voltage values.
Optionally, in an optional implementation manner of this embodiment, a manner of adjusting the voltage of the dc bus according to the comparison result, which is involved in step S106, may be:
step S106-11, under the condition that the th voltage value is larger than or equal to the second voltage value, correcting the voltage of the direct current bus through the converter based on the th sampling value, wherein the th sampling value is the result of dividing the th voltage value minus the second voltage value by 2;
and S106-12, under the condition that the th voltage value is smaller than the second voltage value, correcting the voltage of the direct current bus through the converter based on a second sampling value, wherein the second sampling value is the result of dividing the difference value of the second voltage value minus the th voltage value by 2.
Optionally, the method of this embodiment may further include:
and step S108, stopping executing the operation of adjusting the voltage of the direct current bus under the condition that the absolute value of the difference value between the th voltage value and the second voltage value is smaller than the preset threshold value.
The present application will be illustrated with reference to alternative embodiments of the present embodiment;
the optional embodiment provides direct-current bus voltage stabilization control methods, and the intelligent converter related to the optional embodiment comprises a communication module, a sampling module and a control module, wherein as shown in fig. 2, the sampling module is used for acquiring a bus voltage real-time value at a high speed in real time, the communication module is used for sending sampling statistical data information and control state information of the intelligent converter and receiving data transmitted by other intelligent converters from a CAN bus network, and the control module is used for integrating the sampling data and the communication receiving data, and after logical operation judgment, the control module is used for controlling the energy flow direction of the converter, so that the stable direct-current bus voltage is met, and the energy supply and demand balance of the direct-current bus is ensured.
As shown in fig. 3, in the optional embodiment, a method is adopted, in which the intelligent converter 1 acquires the voltage value of the direct current bus 10 times in a fixed period T from a1 to a2, removes maximum values and minimum values, averages the remaining 8 samples, and sends out the average value P1 of the intelligent converter 1, similarly, the intelligent converter 2 sends out the average value P2, and the intelligent converter 3 sends out the average value P3.
Based on this, in the optional embodiment, the control method for stabilizing the dc bus voltage includes that after receiving P2 and P3, the intelligent converter 1 calculates an average value Pt of (P2+ P3)/2, compares Pt with P1, if Pt is greater than P1, the intelligent converter 1 control module corrects a real-time sampling value △ of (Pt-P1)/2 and then uses the corrected real-time sampling value △ of (P1-Pt)/2 and then uses the corrected real-time sampling value to control the bus voltage, otherwise, if Pt is less than P1, the intelligent converter 1 control module controls the bus voltage.
When the difference between the sampling average value P1 of the intelligent converter 1 and the fixed values P2 and P3 is less than 0.1% of the fixed value , the correction is stopped, and the sampling value of each module is determined to reach .
The intelligent current transformer 2 and the intelligent current transformer 3 process the same, after several corrections, the average sampling value of each intelligent current transformer and the average sampling value sent by other modules tend to be , so that the correction purpose is achieved.
It can be seen that, in this optional embodiment, methods for automatically correcting and calibrating the sampling value of the bus voltage are provided, where each energy control terminal sends its own real-time sampled voltage data value through a non-master communication data bus, and meanwhile, each energy control terminal receives real-time sampled voltage data values sent by other devices, and eliminates the delay effect through a period average value, so as to accurately calibrate the sampling value, and thus, each energy control terminal can acquire the voltage value of the dc bus in real time, which tends to .
Based on the understanding that the technical solution of the present invention per se or parts contributing to the prior art can be embodied in the form of software products stored in storage media (such as ROM/RAM, magnetic disk, optical disk) and including instructions for causing terminal devices (which may be mobile phones, computers, servers, or network devices) to execute the methods according to the embodiments of the present invention.
Example 2
In this embodiment, there are also provided kinds of dc bus voltage adjusting devices, which are used to implement the above-mentioned embodiments and preferred embodiments, and have been explained without further description.
Fig. 4 is a block diagram of an embodiment of the apparatus for adjusting a dc bus voltage according to the present invention, and as shown in fig. 4, the apparatus includes a collecting module 42 for collecting a th voltage value of a dc bus through an th converter, a receiving module 44 coupled to the collecting module 42 for receiving a second voltage value of the dc bus collected by a second converter through an th converter, and an adjusting module 46 coupled to the receiving module 24 for comparing the th voltage value with the second voltage value and adjusting the voltage of the dc bus according to a comparison result.
Optionally, the collecting module 42 in this embodiment includes a collecting unit configured to collect, by using an th current transformer, a plurality of voltage values of the dc bus within a preset time period, and a th processing unit configured to calculate a th average voltage value of the plurality of voltage values within the preset time period, and use the th average voltage value as the th voltage value.
Optionally, the receiving module 44 in this embodiment further may include a receiving unit configured to receive, through the th converter, a plurality of second voltage values collected by a plurality of second converters, where the second voltage values are an average value of voltage values of the dc bus collected by the second converters within a preset time period, and a second processing unit configured to calculate a second average voltage value of the plurality of second voltage values with respect to the plurality of second converters, and use the second average voltage value as the second voltage value.
Optionally, the adjusting module 46 in this embodiment may further include a correcting unit configured to correct the voltage of the dc bus based on a th sampling value through a converter when the th voltage value is greater than or equal to the second voltage value, where the th sampling value is a result of dividing a difference value of the th voltage value minus the second voltage value by 2, and a second correcting unit configured to correct the voltage of the dc bus based on a second sampling value through the converter when the th voltage value is less than the second voltage value, where the second sampling value is a result of dividing a difference value of the second voltage value minus the th voltage value by 2.
Optionally, the apparatus in this embodiment may further include a stopping module, configured to stop performing the operation of adjusting the voltage of the dc bus when an absolute value of a difference between the th voltage value and the second voltage value is smaller than a preset threshold.
It should be noted that the above modules may be implemented by software or hardware, and for the latter, the modules may be implemented by, but are not limited to, being located in the same processor, or being located in different processors in any combination.
Example 3
An embodiment of the present invention further provides storage media having a computer program stored therein, wherein the computer program is arranged to perform the steps of any of the method embodiments described above when executed.
Alternatively, in the present embodiment, the storage medium may be configured to store a computer program for executing the steps of:
s1, collecting a th voltage value of the direct current bus through a th converter;
s2, receiving a second voltage value of the direct current bus collected by the second converter through the converter;
and S3, comparing the voltage value with the second voltage value, and adjusting the voltage of the direct current bus according to the comparison result.
Optionally, in this embodiment, the storage medium may include, but is not limited to: various media capable of storing computer programs, such as a usb disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a removable hard disk, a magnetic disk, or an optical disk.
Embodiments of the present invention further provide electronic devices, comprising a memory having a computer program stored therein and a processor configured to execute the computer program to perform the steps of any of the method embodiments described above.
Optionally, the electronic apparatus may further include a transmission device and an input/output device, wherein the transmission device is connected to the processor, and the input/output device is connected to the processor.
Optionally, in this embodiment, the processor may be configured to execute the following steps by a computer program:
s1, collecting a th voltage value of the direct current bus through a th converter;
s2, receiving a second voltage value of the direct current bus collected by the second converter through the converter;
and S3, comparing the voltage value with the second voltage value, and adjusting the voltage of the direct current bus according to the comparison result.
Optionally, the specific examples in this embodiment may refer to the examples described in the above embodiments and optional implementation manners, and this embodiment is not described herein again.
It will be apparent to those skilled in the art that the modules or steps of the present invention described above may be implemented by a general purpose computing device, they may be centralized on a single computing device or distributed across a network of multiple computing devices, and alternatively, they may be implemented by program code executable by a computing device, such that they may be stored in a storage device and executed by a computing device, and in some cases, the steps shown or described may be performed in an order different than that described herein, or they may be separately fabricated into individual integrated circuit modules, or multiple ones of them may be fabricated into a single integrated circuit module. Thus, the present invention is not limited to any specific combination of hardware and software.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the principle of the present invention should be included in the protection scope of the present invention.
Claims (13)
1, A DC bus voltage regulation method, characterized by comprising:
collecting a voltage value of the direct current bus through an current transformer;
receiving a second voltage value of the direct current bus collected by the second converter through the th converter;
and comparing the th voltage value with the second voltage value, and adjusting the voltage of the direct current bus according to the comparison result.
2. The method of claim 1, wherein collecting voltage values of the dc bus via the converter comprises:
collecting a plurality of voltage values of a direct current bus in a preset time period through an th converter;
calculating th average voltage value of multiple voltage values in the preset time period, and taking the th average voltage value as the th voltage value.
3. The method of claim 1, wherein receiving, by the th converter, the second voltage value of the dc bus collected by the second converter comprises:
receiving a plurality of second voltage values acquired by a plurality of second current transformers through an current transformer, wherein the second voltage values are the average value of the voltage values of the direct current buses acquired by the second current transformers within a preset time period;
and calculating a second average voltage value of the plurality of second voltage values relative to the plurality of second current transformers, and taking the second average voltage value as the second voltage value.
4. The method of claim 1, wherein adjusting the voltage of the dc bus based on the comparison comprises:
when the voltage value is larger than or equal to the second voltage value, the voltage of the direct current bus is corrected through the current transformer based on a sampling value, wherein the sampling value is the result of dividing the difference value of the voltage value minus the second voltage value by 2;
and when the voltage value is smaller than the second voltage value, correcting the voltage of the direct current bus through the current transformer based on a second sampling value, wherein the second sampling value is the result of dividing the difference value of the second voltage value minus the voltage value by 2.
5. The method of claim 1, further comprising:
and stopping executing the operation of adjusting the voltage of the direct current bus under the condition that the absolute value of the difference value between the th voltage value and the second voltage value is smaller than a preset threshold value.
6, kind of adjusting device of direct current busbar voltage characterized by, includes:
the acquisition module is used for acquiring a voltage value of the direct current bus through an current transformer;
the receiving module is used for receiving a second voltage value of the direct current bus collected by the second converter through the th converter;
and the adjusting module is used for comparing the th voltage value with the second voltage value and adjusting the voltage of the direct current bus according to a comparison result.
7. The apparatus of claim 6, wherein the acquisition module comprises:
the acquisition unit is used for acquiring a plurality of voltage values of the direct current bus in a preset time period through the th converter;
an processing unit for calculating average voltage value of multiple voltage values in the preset time period, and taking the average voltage value as the voltage value.
8. The apparatus of claim 6, wherein the receiving module comprises:
the receiving unit is used for receiving a plurality of second voltage values acquired by a plurality of second current transformers through the current transformer, wherein the second voltage values are the average values of the voltage values of the direct current buses acquired by the second current transformers within a preset time period;
and the second processing unit is used for calculating a second average voltage value of the plurality of second voltage values relative to the plurality of second current transformers and taking the second average voltage value as the second voltage value.
9. The apparatus of claim 6, wherein the adjustment module comprises:
an correcting unit, configured to correct, by the converter, the voltage of the dc bus based on a th sampling value when the th voltage value is greater than or equal to the second voltage value, where the th sampling value is a result of dividing a difference value obtained by subtracting the second voltage value from the th voltage value by 2;
and the second correcting unit is used for correcting the voltage of the direct current bus through the current transformer based on a second sampling value when the th voltage value is smaller than the second voltage value, wherein the second sampling value is the result of dividing the difference value of the second voltage value minus the th voltage value by 2.
10. The apparatus of claim 6, further comprising:
and the stopping module is used for stopping executing the operation of adjusting the voltage of the direct current bus under the condition that the absolute value of the difference value between the th voltage value and the second voltage value is smaller than a preset threshold value.
An apparatus of , comprising the device of any of claims 6-10, .
12, computer-readable storage medium, in which a computer program is stored, wherein the computer program is arranged to, when run, perform the method of any of claims 1 to 5 to .
An electronic apparatus comprising a memory and a processor, wherein the memory has stored thereon a computer program, and wherein the processor is configured to execute the computer program to perform the method of any of claims 1-5 .
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Application publication date: 20200131 |