CN108933438B - Distribution network distributed power supply online control device and method based on system operation mode - Google Patents
Distribution network distributed power supply online control device and method based on system operation mode Download PDFInfo
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- CN108933438B CN108933438B CN201810697401.5A CN201810697401A CN108933438B CN 108933438 B CN108933438 B CN 108933438B CN 201810697401 A CN201810697401 A CN 201810697401A CN 108933438 B CN108933438 B CN 108933438B
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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
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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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- 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
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
Abstract
The invention discloses a distribution network distributed power supply online control device and method based on a system operation mode. And the data acquisition module acquires DG access position information and distribution network bus electric quantity and calculates a distribution network back side impedance value in a system operation mode. And the data analysis module is used for receiving the information of the data acquisition module, and is pre-implanted with a corresponding relation table of the corresponding back side impedance value of the power distribution network in different operation modes of the system, the maximum DG access capacity in the current operation mode and the DG access position information under the relay protection constraint. And the control unit module sends out instruction information to control the maximum output of the DG. The invention can control the access capacity of the DG on line according to the current system operation mode of the system, restrict the output of the DG, and effectively improve the operation reliability of the distribution network and the access efficiency of the DG.
Description
Technical Field
The invention relates to a distribution network distributed power supply online control device and method based on a system operation mode, and belongs to the technical field of electrical engineering.
Background
Distributed power generation is receiving increasing attention in the context of global energy shortages and increasingly severe environmental pollution. On one hand, the distributed power supply is connected into a power distribution network to operate, so that the functions of reducing power transmission and distribution equipment, cutting peaks and filling valleys, improving the voltage level, reducing the network loss, improving the power utilization reliability, reducing the environmental pollution and the like can be achieved. On the other hand, the access of the distributed power supply enables the traditional power distribution network to be changed from a radiation type network powered by a single power supply into a complex network powered by a multi-terminal power supply, and the access of the distributed power supply changes the direction of the trend, so that the flow from the system to the load is not single any more, and a series of influences are brought to the power distribution network.
In the planning of the power system, the problems of access capacity and position of the distributed power supply need to be considered in a focused manner, but in the actual operation process of the system, the maximum access capacity of the distributed power supply in different operation modes is different, and in order to improve the utilization efficiency of the distributed power supply and ensure the reliability of the operation of the system, the distributed power supply needs to be controlled in the operation process of the system, and the maximum output of the distributed power supply is restricted. Therefore, the problem of access control of distributed power supplies based on the system operation mode is solved.
Disclosure of Invention
Aiming at the technical problems in the related art, the invention provides a distribution network distributed power supply online control device and method based on a system operation mode.
The invention adopts the following technical scheme for solving the technical problems:
on one hand, the invention provides a distribution network distributed power supply online control device based on a system operation mode, which comprises a data acquisition module, a data analysis module and a control unit module, wherein the data acquisition module acquires the access position information of a distribution network distributed power supply DG and the electric quantity of a distribution network bus, and calculates the impedance value of the back side of the distribution network in the system operation mode; the data analysis module is used for receiving the information transmitted by the data acquisition module, and pre-implanting a corresponding relation table of the corresponding back side impedance value of the power distribution network under different operation modes of the power distribution network system and the DG maximum access capacity and the DG access position information under the consideration of relay protection constraint under the current operation mode into the data analysis module; and the control unit module sends a control instruction and controls the maximum output of the DG according to the maximum access capacity of the DG.
As a further technical scheme of the invention, the data acquisition module comprises a first data acquisition unit, a second data acquisition unit and a power distribution network back side impedance value sending unit, wherein the first data acquisition unit acquires the bus electrical quantity of the power distribution network and calculates the power distribution network back side impedance value in the system operation mode; the second data acquisition unit acquires the access position information of the distribution network distributed power supply DG and sends the access position information to the data analysis module; the power distribution network back side impedance value sending unit transmits the impedance value obtained by the first data acquisition unit to the data analysis module.
As a further technical solution of the present invention, the data analysis module includes an information receiving unit, a data analysis unit, and a DG maximum access capacity value transmitting unit, wherein the information receiving unit is connected to the data acquisition module, and receives DG access position information and a back side impedance value of the power distribution network; the data analysis unit is connected with the information receiving unit and analyzes a DG maximum access capacity value according to the DG access position information and the power distribution network back side impedance value received by the information receiving unit; and the DG maximum access capacity value sending unit sends the DG maximum access capacity value to the control unit module.
As a further technical solution of the present invention, the control unit module includes a DG maximum access capacity value receiving unit and a control unit, wherein the DG maximum access capacity value receiving unit is connected to the data analysis module, and receives the DG maximum capacity value; and the control unit sends a control command and controls the maximum output of the DG according to the maximum access capacity of the DG.
On the other hand, the invention also provides a control method of the distribution network distributed power supply online control device based on any one of the system operation modes, which is characterized by comprising the following steps:
(1) pre-implanting corresponding relation information of a power distribution network back side impedance value under different operation modes of the system under consideration of relay protection constraint and a DG access maximum capacity value and a DG access position under the current system operation mode into a data analysis module;
(2) a data acquisition module in the control device acquires DG position information and distribution network bus electrical quantity on line and calculates a distribution network back side impedance value in a system operation mode;
(3) the data analysis module receives the access position information of the DGs and the back side impedance value of the power distribution network transmitted in the data acquisition module, and outputs the maximum access capacity value of the DGs according to the matching corresponding relation of the pre-implanted information;
(4) and the control unit module sends out instruction information to control the output of the DG and restrict the maximum output of the DG.
Compared with the prior art, the invention adopting the technical scheme has the following technical effects: the invention controls the access of the DG on line according to the corresponding relation of the different system operation modes and the DG access capacity and the positions, restrains the maximum output of the DG, can better improve the utilization efficiency of the distributed power supply, and can better improve the reliability of the system operation.
Drawings
Fig. 1 is a schematic diagram of a power distribution network structure provided in an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a control device according to an embodiment of the present invention.
Fig. 3 is a schematic diagram of information transmission of internal units of the control device according to the embodiment of the present invention.
Fig. 4 is a control flow chart of the control device according to the embodiment of the present invention.
Fig. 5 is a schematic step diagram of a distributed power supply online control method based on a system operation mode according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
The technical scheme of the invention is further explained in detail by combining the attached drawings:
the distributed power supply online control method based on the system operation mode needs to be provided with a control device in a power distribution network system in advance, and a power distribution network framework containing DGs is shown in figure 1. The pre-installed control device, as shown in fig. 2, includes a data acquisition module, a data analysis module, and a control unit module, and outputs information of the data acquisition module to the data analysis module, and the control unit module outputs a control command according to the information obtained by the data analysis module.
The specific transmission relationship of the internal units of the control device in this example is shown in fig. 3.
The control device in this example controls the flow as shown in fig. 4.
The data acquisition module comprises a data acquisition unit A, a data acquisition unit B and a power distribution network back side impedance value sending unit. The data acquisition unit A acquires the electrical quantity of a bus, and the data acquisition unit B acquires DG position information.
Further, the data acquisition unit a acquires the electrical quantity of the bus of the power distribution network in the current system operation mode, processes the acquired information, and calculates the impedance value of the back side of the power distribution network. The data acquisition period was divided into 96 points according to daily load characteristics and acquired every 15 minutes. The data acquisition unit B acquires the access position of the DG. The data acquisition interface conforms to IEC61970 standard or IEC61968 standard, and the data acquisition communication specification is DL/T634.
Further, the power distribution network back side impedance value sending unit sends the impedance value obtained by the data acquisition module to the data analysis module for analysis.
The data analysis module comprises an information receiving unit, a data analysis unit and a DG maximum access capacity value sending unit.
Furthermore, the information receiving unit is connected to the data acquisition module and receives DG access position information and the back side impedance value of the power distribution network.
Furthermore, the data analysis unit is connected with the information receiving unit, and analyzes the maximum DG access capacity value according to the DG access position information and the impedance value at the back side of the power distribution network received by the information receiving unit.
Further, the DG maximum access capacity value is connected to the data analysis unit, and the transmission unit transmits the DG maximum access capacity value to the control unit module.
A table of correspondence between corresponding back-side impedance values of the power distribution network system in different operation modes and corresponding maximum DG access capacity and DG access position information under consideration of relay protection constraints in a current operation mode is pre-implanted in the data analysis module, as shown in table 1 (it should be noted that table 1 is only an example of the present invention for detailed description, and a more detailed correspondence should be implemented in an internal memory of the data analysis module).
Table 1 table of correspondence between back side impedance value of power distribution network, DG power access position and DG maximum capacity value in different system operation modes
The control unit module comprises a DG maximum access capacity value receiving unit and a control unit.
Further, the DG maximum access capacity value receiving unit receives a DG maximum access capacity value. And the control unit sends a control command to control the output of the DG and restrict the maximum output of the DG.
As shown in fig. 5, in this example, a method for online controlling a distribution network distributed power supply based on a system operation mode is provided. The method is characterized by comprising the following steps:
(1) a data analysis module in the control device is pre-stored in an internal memory, and a corresponding relation table of corresponding power distribution network back side impedance values under different operation modes of the system and DG maximum access capacity and DG access position information under consideration of relay protection constraint under the current operation mode is pre-implanted into the data analysis module;
(2) a data acquisition module in the control device acquires DG position information and distribution network bus electrical quantity on line and calculates a distribution network back side impedance value in a system operation mode.
(3) And the data analysis module receives the access position information of the DGs and the impedance value of the back side of the power distribution network. And analyzing the maximum access capacity value of the DG under the current system operation mode according to the information implanted in the internal memory in advance, and outputting the maximum access capacity value of the DG.
(4) And in the control unit module, receiving a DG access maximum capacity value in the data analysis module, sending instruction information to the DG through the CPU according to the received DG access maximum capacity value, controlling the output of the DG and constraining the maximum output of the DG.
The above examples are for better illustration of the invention, but are not limited to this scheme. It will be clear to a person skilled in the art that modifications may be made without the inventive faculty, without departing from the scope of the core idea of the invention, which is within the scope of the claims.
Claims (5)
1. The distribution network distributed power supply online control device based on the system operation mode is characterized by comprising a data acquisition module, a data analysis module and a control unit module, wherein the data acquisition module acquires the access position information of a distribution network distributed power supply DG and the electric quantity of a distribution network bus, and calculates the impedance value of the back side of the distribution network in the system operation mode; the data analysis module is used for receiving the information transmitted by the data acquisition module, and finding the DG maximum access capacity corresponding to the information transmitted by the data acquisition module from a corresponding relation table of corresponding power distribution network back side impedance values of the power distribution network system implanted in advance in different operation modes and corresponding DG maximum access capacity and DG access position information under the consideration of relay protection constraint in the current operation mode; and the control unit module sends a control instruction and controls the maximum output of the DG according to the maximum access capacity of the DG transmitted by the data analysis module.
2. The distribution network distributed power supply online control device based on the system operation mode is characterized in that the data acquisition module comprises a first data acquisition unit, a second data acquisition unit and a distribution network back side impedance value sending unit, wherein the first data acquisition unit acquires distribution network bus electrical quantity and calculates a distribution network back side impedance value in the system operation mode; the second data acquisition unit acquires the access position information of the distribution network distributed power supply DG and sends the access position information to the data analysis module; the power distribution network back side impedance value sending unit transmits the impedance value obtained by the first data acquisition unit to the data analysis module.
3. The distribution network distributed power supply online control device based on the system operation mode is characterized in that the data analysis module comprises an information receiving unit, a data analysis unit and a DG maximum access capacity value sending unit, wherein the information receiving unit is connected with the data acquisition module and receives DG access position information and a distribution network back side impedance value; the data analysis unit is connected with the information receiving unit and analyzes a DG maximum access capacity value according to the DG access position information and the power distribution network back side impedance value received by the information receiving unit; and the DG maximum access capacity value sending unit sends the DG maximum access capacity value to the control unit module.
4. The distribution network distributed power supply online control device based on the system operation mode as claimed in claim 1, wherein the control unit module comprises a DG maximum access capacity value receiving unit and a control unit, wherein the DG maximum access capacity value receiving unit is connected with the data analysis module and receives a DG maximum capacity value; and the control unit sends a control command and controls the maximum output of the DG according to the maximum access capacity of the DG.
5. The control method of the distribution network distributed power supply on-line control device based on the system operation mode as claimed in any one of claims 1 to 4, characterized by comprising the following steps:
(1) pre-implanting corresponding relation information of a power distribution network back side impedance value under different operation modes of the system under consideration of relay protection constraint and a DG access maximum capacity value and a DG access position under the current system operation mode into a data analysis module;
(2) a data acquisition module in the control device acquires DG position information and distribution network bus electrical quantity on line and calculates a distribution network back side impedance value in a system operation mode;
(3) the data analysis module receives the access position information of the DGs and the back side impedance value of the power distribution network transmitted in the data acquisition module, and outputs the maximum access capacity value of the DGs according to the matching corresponding relation of the pre-implanted information;
(4) and the control unit module sends command information, controls the output of the DG according to the maximum access capacity of the DG and restricts the maximum output of the DG.
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