CN109066811B - Harmonic current allowable value distribution method and system for large-scale new energy at power grid output collection point - Google Patents
Harmonic current allowable value distribution method and system for large-scale new energy at power grid output collection point Download PDFInfo
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- CN109066811B CN109066811B CN201811140990.3A CN201811140990A CN109066811B CN 109066811 B CN109066811 B CN 109066811B CN 201811140990 A CN201811140990 A CN 201811140990A CN 109066811 B CN109066811 B CN 109066811B
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- 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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Abstract
The invention discloses a harmonic current allowable value distribution method and a system of a large-scale new energy source at a power grid output collection point, wherein the method comprises the following steps: dividing power supply areas of power supply equipment of a superior power grid according to the voltage level of new energy grid connection, and determining the power supply equipment of each power supply area; calculating the installed capacity of a new energy grid-connected network containing a harmonic source in a power supply area; according to the load condition in the power supply area, judging whether the conditions that the output of new energy cannot be completely consumed in the current area and needs to be transmitted to a power grid outside the area exist or not; if yes, determining to send out a collection point; calculating the capacity of power supply equipment in the power supply area; judging whether the installed capacity is larger than the capacity of the power supply equipment or not; if the capacity of the installed capacity is larger than the capacity of the power supply equipment, distributing the allowable value of the harmonic current of the new energy grid connection according to the installed capacity ratio, and if the capacity of the installed capacity is smaller than the capacity of the power supply equipment, distributing the allowable value of the harmonic current of the new energy grid connection according to the installed capacity ratio. The method is beneficial to strengthening harmonic source treatment and ensuring safe and stable operation of the power grid.
Description
Technical Field
The embodiment of the invention relates to the technical field of combination of new energy and electric power technology, in particular to a harmonic current allowable value distribution method and system for a large-scale new energy source at a power grid output collection point.
Background
With the continuous deepening of the energy revolution, the new energy grid-connected power generation scale is larger and larger, and power equipment based on power electronics gradually becomes an important component in a power grid. The large-scale new energy provides clean low-carbon energy supply and brings a large amount of harmonic pollution.
Due to the rapid increase of grid-connected scale of new energy such as wind turbine generators, photovoltaic and the like in the same region, the load in the near region cannot be completely absorbed, and the rest part can be sent out through a superior power grid. Accordingly, a part of the harmonic current flows into the near-field users, and another part of the harmonic current flows into the upper-level grid.
The method comprises the steps that new energy power generation equipment such as a wind turbine generator and a photovoltaic system needs to analyze power quality interference generated by the new energy power generation equipment before grid connection, and indexes such as harmonic waves, voltage fluctuation and flicker of the new energy power generation equipment at a public connection point of a power grid under different operation conditions are evaluated; and a treatment scheme is provided for the indexes exceeding the requirements, so that the power quality after treatment measures are taken can meet the requirements.
For a single new energy power supply, harmonic current at the treated common connection point can meet standard requirements; however, if a large-scale new energy grid connection exists in the area and needs to be sent out, part of harmonic current is amplified through the power transmission line, and the harmonic current at the concentration point of the concentrated sending-out may exceed the standard. Therefore, not only the power quality at the grid-connected point or the public connection point of the power grid, but also the power quality index sent out of the collection point under the condition of power delivery is ensured to be within an allowable range.
The national standard 'electric energy quality public power grid harmonic' (GB/T14549-93) stipulates the allowable total value of harmonic current of a user at a public connection point and the distribution coefficient of the harmonic current; the technical specification of south grid wind farm access grid (Q/CSG11008-2011) of the enterprise marks also stipulates the allowable value of harmonic current and the distribution coefficient of the harmonic current at the grid-connected point of the wind farm.
The regulations of the enterprise standard south power grid wind power plant access power grid technical specification (Q/CSG 11008-plus 2011) on the allowable value of the harmonic current are consistent with the national standard power quality public power grid harmonic (GB/T14549-93), but the selection of the position of the evaluation point and the distribution principle of the allowable value of the harmonic current are different. The national standard check point is a public connection point, and the allowable value of the harmonic current is distributed according to the ratio of the protocol capacity of a user at the point to the capacity of the power supply equipment which is connected with the user in public; the enterprise examination point is a grid-connected point, and the allowable value of the harmonic current is distributed according to the ratio of the installed capacity of the wind power plant to the total capacity of the power generation/supply equipment with the harmonic source on the grid-connected point. Neither method clearly distributes harmonic current of a large-scale new energy source at a sending-out collection point in a power grid, and if the method is not properly controlled, the method may cause damage to power grid equipment.
Disclosure of Invention
The invention provides a harmonic current allowable value distribution method and system of a large-scale new energy source at a power grid output collection point, and aims to overcome the defects of the prior art.
In order to achieve the above purpose, the present invention provides the following technical solutions:
in a first aspect, an embodiment of the present invention provides a method for distributing a harmonic current allowable value of a large-scale new energy source at a grid delivery sink, where the method includes:
s11, dividing power supply areas of power supply equipment of a superior power grid according to the voltage level of new energy grid connection, and determining the power supply equipment of each power supply area;
s12, calculating the installed capacity of the new energy grid-connected system containing the harmonic source in the power supply area;
s13, judging whether the new energy output cannot be completely consumed in the current region and needs to be transmitted to a power grid outside the region according to the load condition in the power supply region; if yes, executing S14, otherwise, terminating;
s14, determining a sending-out collection point;
s15, calculating the capacity of the power supply equipment in the power supply area;
s16, judging whether the installed capacity is larger than the capacity of the power supply equipment or not; if yes, executing S17, otherwise executing S18;
s17, distributing the harmonic current allowable value of the new energy grid connection according to the ratio of installed capacity to power supply equipment capacity;
and S18, distributing the allowable value of the harmonic current of the new energy grid connection according to the installed capacity ratio.
Further, in the harmonic current allowable value distribution method of the large-scale new energy source at the grid outlet sink, if the new energy source is incorporated into the grid through different voltage levels, the S11 includes:
s111, analyzing each voltage level of new energy grid connection;
and S112, dividing the power supply areas of the power supply equipment of the upper-level power grid in the operation mode with the minimum new energy consumption ratio, and determining the power supply equipment of each power supply area.
Further, in the harmonic current allowable value distribution method of the large-scale new energy at the power grid output collection point, the power supply equipment of the upper-level power grid is a transformer substation with a voltage level higher than that of the new energy grid.
Further, in the harmonic current allowable value distribution method of the large-scale new energy source at a collection point sent by a power grid, the collection point is a bus in a higher-level substation, and the bus is connected with the new energy source in a grid-connected mode at the same voltage level.
In a second aspect, an embodiment of the present invention provides a harmonic current allowable value distribution system for a large-scale new energy source at a grid delivery sink, where the system includes:
the area division module is used for dividing power supply areas of power supply equipment of a superior power grid according to the voltage level of new energy grid connection and determining the power supply equipment of each power supply area;
the first calculation module is used for calculating the installed capacity of new energy grid-connected power supply areas containing harmonic sources;
the first judgment module is used for judging whether the conditions that the output of the new energy cannot be completely consumed in the current region and needs to be transmitted to a power grid outside the region exist according to the load condition in the power supply region; if yes, the collection point determining module executes the operation of determining the collection point, and if not, the operation is terminated;
the second calculation module is used for calculating the capacity of the power supply equipment in the power supply area;
the second judgment module is used for judging whether the installed capacity is larger than the capacity of the power supply equipment or not; if the current ratio of the installed capacity to the capacity of the power supply equipment is not the same as the current ratio of the installed capacity, the first distribution module performs the operation of distributing the harmonic current allowable value of the new energy grid connection according to the installed capacity ratio, and if the current ratio of the installed capacity to the capacity of the power supply equipment is not the same as the current ratio of the installed capacity, the second distribution module performs the operation of distributing the harmonic current allowable value of the new energy grid connection according to.
Further, in the harmonic current allowable value distribution system of the large-scale new energy source at the grid delivery collection point, if the new energy source is incorporated into the grid through different voltage classes, the area division module includes:
the voltage analysis unit is used for analyzing each voltage grade of the new energy grid connection;
and the region dividing unit is used for dividing the power supply regions of the power supply equipment of the superior power grid in the operation mode with the minimum new energy consumption ratio and determining the power supply equipment of each power supply region.
Furthermore, in the harmonic current allowable value distribution system of the large-scale new energy source at the power grid output collection point, the power supply equipment of the upper-level power grid is a transformer substation with a voltage level higher than that of the new energy source grid.
Furthermore, the large-scale new energy is sent out from a harmonic current allowable value distribution system of a collection point in a power grid, and the collection point is a bus in a superior substation, which is connected with the new energy in a grid at the same voltage level.
According to the harmonic current allowable value distribution method and system for the large-scale new energy at the power grid output collection point, provided by the embodiment of the invention, the distribution of the harmonic current allowable value of the large-scale new energy at the power grid output collection point is considered while the national standard and enterprise standard principles are followed, the new energy grid-connected standard is further perfected, the harmonic source management is favorably strengthened, and the safe and stable operation of the power grid is ensured.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.
Fig. 1 is a schematic flowchart of a method for distributing allowable harmonic currents of a large-scale new energy at a grid outlet sink according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a harmonic current allowable value distribution system of a large-scale new energy source at a grid delivery sink according to a second embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Example one
Referring to fig. 1, a schematic flow chart of a method for distributing a harmonic current allowable value of a large-scale new energy at a grid output sink according to an embodiment of the present invention is shown, where the method specifically includes the following steps:
and S11, dividing the power supply areas of the power supply equipment of the upper power grid according to the voltage level of the new energy grid connection, and determining the power supply equipment of each power supply area.
The new energy is collected through the bus of the access transformer substation, and the outgoing line of the transformer substation is used for power distribution, so that the power supply equipment of the superior power grid is a transformer substation with a higher voltage level than the new energy grid.
Specifically, if the new energy is incorporated into the power grid through different voltage classes, step S11 further includes:
and S111, analyzing each voltage level of the new energy grid connection.
And S112, dividing the power supply areas of the power supply equipment of the upper-level power grid in the operation mode with the minimum new energy consumption ratio, and determining the power supply equipment of each power supply area.
It should be noted that the division of the power supply region is performed in the operating mode in which the new energy consumption ratio is minimum, because the harmonic current flowing into the power grid is the largest in this case.
And S12, calculating the installed capacity of the new energy grid-connected system containing the harmonic source in the power supply area.
The method comprises the step of respectively calculating the installed capacity of the new energy grid-connected network containing the harmonic sources in each power supply area to obtain the total installed capacity.
S13, judging whether the new energy output cannot be completely consumed in the current region and needs to be transmitted to a power grid outside the region according to the load condition in the power supply region; if so, go to S14, otherwise, go to S19.
And S14, determining the sending-out collection point.
The collection point is a bus in a superior substation, which is connected with the new energy in a grid mode at the same voltage level.
And S15, calculating the capacity of the power supply equipment in the power supply area.
S16, judging whether the installed capacity is larger than the capacity of the power supply equipment or not; if so, go to S17, otherwise, go to S18.
And S17, distributing the allowable value of the harmonic current of the new energy grid connection according to the ratio of the installed capacity to the capacity of the power supply equipment.
And S18, distributing the allowable value of the harmonic current of the new energy grid connection according to the installed capacity ratio.
It should be noted that the total amount of harmonic current is controlled according to the national and enterprise standards.
And S19, ending.
According to the harmonic current allowable value distribution method for the large-scale new energy at the power grid output collection point, provided by the embodiment of the invention, the distribution of the harmonic current allowable value of the large-scale new energy at the power grid output collection point is considered while the national standard and enterprise standard principles are followed, the new energy grid-connection standard is further perfected, the harmonic source control is favorably strengthened, and the safe and stable operation of the power grid is ensured.
Example two
Referring to fig. 2, a schematic structural diagram of a harmonic current allowable value distribution system of a large-scale new energy source at a grid delivery sink according to a second embodiment of the present invention is shown, where the system is adapted to execute a harmonic current allowable value distribution method of a large-scale new energy source at a grid delivery sink according to the second embodiment of the present invention. The system specifically comprises the following modules:
the region division module 21 is configured to divide power supply regions of power supply devices of a higher-level power grid according to a voltage level of new energy grid connection, and determine the power supply devices of the power supply regions;
the first calculation module 22 is used for calculating the installed capacity of new energy grid-connected power supply areas containing harmonic sources;
the first judging module 23 is configured to judge whether a situation that the new energy output cannot be completely consumed in the current area and needs to be transmitted to a power grid outside the area exists according to a load situation in the power supply area; if yes, the collection point determining module 24 executes an operation of determining to send out a collection point, and if no, the operation is terminated;
a second calculating module 25, configured to calculate a capacity of the power supply device in the power supply area;
a second judging module 26, configured to judge whether the installed capacity is greater than the capacity of the power supply apparatus; if so, the first distribution module 27 performs the operation of distributing the harmonic current allowable value of the new energy grid connection according to the ratio of the installed capacity to the power supply equipment capacity, and if not, the second distribution module 28 performs the operation of distributing the harmonic current allowable value of the new energy grid connection according to the installed capacity ratio.
The harmonic current allowable value distribution system of the large-scale new energy at the power grid output collection point provided by the embodiment of the invention considers the distribution of the harmonic current allowable value of the large-scale new energy at the power grid output collection point while following the national standard and enterprise standard principles, further improves the new energy grid-connected standard, is beneficial to strengthening the harmonic source management and ensures the safe and stable operation of the power grid.
Preferably, if the new energy is incorporated into the power grid through different voltage classes, the area division module includes:
the voltage analysis unit is used for analyzing each voltage grade of the new energy grid connection;
and the region dividing unit is used for dividing the power supply regions of the power supply equipment of the superior power grid in the operation mode with the minimum new energy consumption ratio and determining the power supply equipment of each power supply region.
Preferably, the power supply equipment of the higher-level power grid is a transformer substation with a voltage level higher than that of the new energy grid-connected.
Preferably, the collection point is a bus in a superior substation, which is connected to the new energy grid at the same voltage level.
The system can execute the method provided by any embodiment of the invention, and has corresponding functional modules and beneficial effects of the execution method.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (8)
1. A harmonic current allowable value distribution method of a large-scale new energy source at a power grid delivery collection point is characterized by comprising the following steps:
s11, dividing power supply areas of power supply equipment of a superior power grid according to the voltage level of new energy grid connection, and determining the power supply equipment of each power supply area;
s12, calculating the installed capacity of the new energy grid-connected system containing the harmonic source in the power supply area;
s13, judging whether the new energy output cannot be completely consumed in the current region and needs to be transmitted to a power grid outside the region according to the load condition in the power supply region; if yes, executing S14, otherwise, terminating;
s14, determining a sending-out collection point;
s15, calculating the capacity of the power supply equipment in the power supply area;
s16, judging whether the installed capacity is larger than the capacity of the power supply equipment or not; if yes, executing S17, otherwise executing S18;
s17, distributing the harmonic current allowable value of the new energy grid connection according to the ratio of installed capacity to power supply equipment capacity;
and S18, distributing the allowable value of the harmonic current of the new energy grid connection according to the installed capacity ratio.
2. The method for distributing harmonic current allowable values at a grid-output junction of large-scale new energy according to claim 1, wherein if the new energy is incorporated into the grid through different voltage classes, the S11 includes:
s111, analyzing each voltage level of new energy grid connection;
and S112, dividing the power supply areas of the power supply equipment of the upper-level power grid in the operation mode with the minimum new energy consumption ratio, and determining the power supply equipment of each power supply area.
3. The harmonic current allowable value distribution method of the large-scale new energy at the grid-outlet collection point according to claim 2, wherein the power supply equipment of the upper-level grid is a substation with a voltage level higher than that of the new energy grid-connection.
4. The harmonic current allowable value distribution method of the large-scale new energy source at the grid-connected collection point is characterized in that the collection point is a bus in a higher-level substation, and the bus is connected with the new energy source in the same voltage level.
5. A harmonic current allowable value distribution system of a large-scale new energy source at a power grid delivery collection point is characterized by comprising:
the area division module is used for dividing power supply areas of power supply equipment of a superior power grid according to the voltage level of new energy grid connection and determining the power supply equipment of each power supply area;
the first calculation module is used for calculating the installed capacity of new energy grid-connected power supply areas containing harmonic sources;
the first judgment module is used for judging whether the conditions that the output of the new energy cannot be completely consumed in the current region and needs to be transmitted to a power grid outside the region exist according to the load condition in the power supply region; if yes, the collection point determining module executes the operation of determining the collection point, and if not, the operation is terminated;
the second calculation module is used for calculating the capacity of the power supply equipment in the power supply area;
the second judgment module is used for judging whether the installed capacity is larger than the capacity of the power supply equipment or not; if the current ratio of the installed capacity to the capacity of the power supply equipment is not the same as the current ratio of the installed capacity, the first distribution module performs the operation of distributing the harmonic current allowable value of the new energy grid connection according to the installed capacity ratio, and if the current ratio of the installed capacity to the capacity of the power supply equipment is not the same as the current ratio of the installed capacity, the second distribution module performs the operation of distributing the harmonic current allowable value of the new energy grid connection according to.
6. The system of claim 5, wherein the area division module comprises:
the voltage analysis unit is used for analyzing each voltage grade of the new energy grid connection;
and the region dividing unit is used for dividing the power supply regions of the power supply equipment of the superior power grid in the operation mode with the minimum new energy consumption ratio and determining the power supply equipment of each power supply region.
7. The harmonic current allowable value distribution system of the large-scale new energy source at the grid-outlet collection point is characterized in that the power supply equipment of the upper-level grid is a substation with a voltage level higher than that of the new energy source grid-connection.
8. The harmonic current allowable value distribution system of the large-scale new energy source at the grid-connected collection point is characterized in that the collection point is a bus in a higher-level substation, and the bus is connected with the new energy source in the same voltage level.
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