CN109687521B - Method for evaluating new energy accepting capability of regional power grid - Google Patents
Method for evaluating new energy accepting capability of regional power grid Download PDFInfo
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Abstract
The invention relates to an evaluation method for the new energy accepting capacity of a regional power grid, which comprises the following steps: according to the receiving capacity P1 and the sending capacity P2, the minimum value of the comparison between the two is used as the maximum possible receiving new energy installed theoretical value P3 of the sending section; according to the maximum admissible scale P4, comparing the maximum admissible scale with a theoretical value P3 of the maximum admissible new energy installed on the upper delivery section, and taking the minimum value as the theoretical value P5 of the maximum admissible new energy installed on the power grid; comparing the theoretical value P5 of the maximum admissible new energy installation of the power grid with the power transmission capacity P6 of the 220kV power grid, and taking the minimum value as the theoretical value P7 of the maximum admissible new energy installation of the power grid; and determining the maximum acceptable new energy installed theoretical value P8 of the local power grid. The invention not only considers the self accepting capacity of the power grid in the area, but also analyzes the sending capacity and the full province peak regulation capacity of the power grid, and ensures that the accepting capacity of new energy in the area meets the requirements of sending out the power grid and the full province peak regulation.
Description
Technical Field
The invention relates to the technical field of new energy accepting methods for power grids, in particular to an evaluation method for the accepting capacity of a regional power grid for new energy.
Background
With the increasingly prominent energy safety problem and environmental problem, China increases the development of renewable energy. The new energy is also called unconventional energy, and refers to various energy forms other than the traditional energy, such as solar energy, wind energy, biomass energy and the like, and has the characteristics of environmental protection, sustainable utilization and the like. The grid connection of new energy necessarily brings new challenges to the safety and stability of the power grid, and the power generation economy of the new energy is lower than that of conventional thermal power generation. Only when overall planning and comprehensive analysis are considered, the regional power grid acceptance capacity is reasonably determined, and the new energy power station is guided to be scientifically and reasonably constructed, so that the scale is moderate, the layout is reasonable, the coordinated development of the power supply of the power grid can be ensured, and the power generation economy is improved. Multiple factors need to be considered when reasonably determining the regional power grid acceptance capacity: firstly, the fact that a power grid can accept a theoretical value needs to be considered; the second need to consider: along with the gradual operation of new energy, the installed scale of the regional voltage is gradually increased, and when the local load level is not enough to completely absorb the power generated by the power supply, the power grid of each region is converted from a receiving-end power grid to a transmitting-end power grid, and the transmitting capacity of the power grid needs to be analyzed when the problem of new energy acceptance is considered; and thirdly, the full province peak regulation capability is considered. The existing new energy accepting method has the problem that the accepting capability of a power grid, the outgoing section and the full provincial peak regulation capability are not effectively combined.
Disclosure of Invention
The invention aims to provide an evaluation method for the new energy accepting capability of a regional power grid, which can perform full province peak regulation balance analysis and reasonably determine the new energy accepting capability of the regional power grid by combining the full province peak regulation capability.
In order to achieve the purpose, the invention adopts the following technical scheme: a method for evaluating the capacity of a regional power grid to receive new energy comprises the following steps in sequence:
(1) calculating the accepting capacity P1 of the main transformer capacity according to the transformation capacity balance, verifying the line sending capacity P2 according to the line quota level, and comparing the minimum value of the line sending capacity P2 with the minimum value to serve as the maximum possible accepting new energy installed theoretical value P3 of an upper sending section;
(2) evaluating the maximum admissible scale P4 according to the power grid interval resource condition, comparing the maximum admissible scale P4 with the theoretical value P3 of the maximum admissible new energy installed on the upper delivery section, and taking the minimum value as the theoretical value P5 of the maximum admissible new energy installed on the power grid;
(3) comparing the theoretical value P5 of the maximum admissible new energy installation of the power grid with the power transmission capacity P6 of the 220kV power grid, and taking the minimum value as the theoretical value P7 of the maximum admissible new energy installation of the power grid;
(4) on the basis of considering the full provincial peak regulation capacity, the maximum admissible new energy installed theoretical value P8 of the local power grid is determined by combining the new energy admission capacity of other areas.
In the step (1), the calculation formula of the main transformer capacity accepting capacity P1 is as follows:
p1 ═ main transformer capacity × power factor- (power supply output-load))/new energy output rate + existing and planned new energy installed capacity
Wherein, the capacity of the main transformer is calculated by a 220kV main transformer, and the power factor is 0.95;
the power supply output time interval is consistent with the load selected time interval, and the maximum time interval of subtraction of the power supply output time interval and the load selected time interval is selected according to the load characteristic analysis and the new energy output characteristic;
the power supply output is equal to biomass, garbage, various units of a gas turbine, auxiliary power, the existing and planned new energy installed capacity and the new energy output rate;
the load is the annual maximum load of each station multiplied by the percentage of the load in the period to the annual maximum load;
the new energy output rate is selected in the following mode: analyzing 8760-hour output data of the new energy power station which is put into operation in the area or the periphery to obtain the month and the time period of the new energy heavy hair and the output rate value of the new energy;
the load characteristic analysis means: the method comprises the steps of researching 8760-hour load data of 3-5 years of regional history, obtaining load valley months, typical daily load peak periods and valley periods of each season by analyzing annual load curves and typical daily load curves of four seasons, and determining the percentage of the load in the period accounting for the maximum load of the whole year according to the period of heavy new energy emergence.
In step (1), the calculation formula of the line quota level verification line sending capability P2 is as follows:
p2 ═ section quota level + load-power supply output)/new energy output rate + existing and planned new energy installed capacity
The selection of the load and the power supply time period is the same as the power supply output and the load selected by P1; and (3) determining the section to which the 220kV station belongs according to the comprehensive analysis of the grid structure of the section quota level, and determining the section quota level by combining the transmission quota of the 220kV line.
In step (2), the calculation formula of the maximum acceptable scale P4 for the grid interval resource condition evaluation is as follows:
p4 is 110kV available interval number x new energy scale allowed by the voltage level line +35kV available interval number x new energy scale allowed by the voltage level line + existing and planned new energy installed capacity
The number of the 110kV available intervals is 220kV substation 110kV final scale +110kV substation 110kV final scale-used 110kV intervals-110 kV intervals are planned to be used; the 35kV available interval number is 220kV transformer substation 35kV final scale +110kV transformer substation 35kV final scale-used 35kV interval-planned use 35kV interval; the new energy allowed by the 110kV line is 100MW, and the new energy allowed by the 35kV line is 40 MW.
In the step (3), the calculation formula of the power transmission capacity P6 of the 220kV grid is as follows:
p6 is new energy installed capacity accepted by power grid under important line or main transformer N-1 mode
And the installed capacity of the new energy which can be accepted by the power grid is the installed capacity of the existing new energy, the installed capacity of the planned new energy and the installed capacity of the new energy which meets the requirement of load flow calculation and verification and can be increased again by the power grid.
In the step (3), the full province peak regulation capacity is the peak regulation capacity of all the units except the new energy, the peak regulation capacity of the external unit, peak valley difference, load standby and accident standby;
if the full province peak regulation capacity-other region new energy admission capacity is less than P7, P8 is full province peak regulation space-other region new energy admission capacity, and if the full province peak regulation space-other region new energy admission capacity is more than or equal to P7, P8 is P7.
According to the technical scheme, the beneficial effects of the invention are as follows: firstly, for the regional power grid, analysis is performed on all sections such as main transformer capacity, interval resources and uploading sections, and the new energy receiving capacity of each station is fully analyzed, so that the later-stage new energy layout of the region is facilitated; and secondly, not only is the self accepting capacity of the power grid of the region considered, but also the sending capacity and the full province peak regulation capacity of the power grid are analyzed, and the accepting capacity of new energy of the region is ensured to meet the requirements of sending out the power grid and the full province peak regulation.
Drawings
FIG. 1 is a flow chart of the method of the present invention.
Detailed Description
As shown in fig. 1, a method for evaluating the capacity of a regional power grid to receive new energy includes the following steps:
(1) calculating the accepting capacity P1 of the main transformer capacity according to the transformation capacity balance, verifying the line sending capacity P2 according to the line quota level, and comparing the minimum value of the line sending capacity P2 with the minimum value to serve as the maximum possible accepting new energy installed theoretical value P3 of an upper sending section;
(2) evaluating the maximum admissible scale P4 according to the power grid interval resource condition, comparing the maximum admissible scale P4 with the theoretical value P3 of the maximum admissible new energy installed on the upper delivery section, and taking the minimum value as the theoretical value P5 of the maximum admissible new energy installed on the power grid;
(3) comparing the theoretical value P5 of the maximum admissible new energy installation of the power grid with the power transmission capacity P6 of the 220kV power grid, and taking the minimum value as the theoretical value P7 of the maximum admissible new energy installation of the power grid;
(4) on the basis of considering the full provincial peak regulation capacity, the maximum admissible new energy installed theoretical value P8 of the local power grid is determined by combining the new energy admission capacity of other areas.
The new energy researched by the invention mainly refers to wind energy and solar energy.
In the step (1), the calculation formula of the main transformer capacity accepting capacity P1 is as follows:
p1 ═ main transformer capacity × power factor- (power supply output-load))/new energy output rate + existing and planned new energy installed capacity
Wherein, the capacity of the main transformer is calculated by a 220kV main transformer, and the power factor is 0.95;
the power supply output time interval is consistent with the load selected time interval, and the maximum time interval of subtraction of the power supply output time interval and the load selected time interval is selected according to the load characteristic analysis and the new energy output characteristic;
the power supply output is equal to biomass, garbage, various units of a gas turbine, auxiliary power, the existing and planned new energy installed capacity and the new energy output rate;
the load is the annual maximum load of each station multiplied by the percentage of the load in the period to the annual maximum load;
the new energy output rate is selected in the following mode: analyzing 8760-hour output data of the new energy power station which is put into operation in the area or the periphery to obtain the month and the time period of the new energy heavy hair and the output rate value of the new energy;
the load characteristic analysis means: the method comprises the steps of researching 8760-hour load data of 3-5 years of regional history, obtaining load valley months, typical daily load peak periods and valley periods of each season by analyzing annual load curves and typical daily load curves of four seasons, and determining the percentage of the load in the period accounting for the maximum load of the whole year according to the period of heavy new energy emergence.
In step (1), the calculation formula of the line quota level verification line sending capability P2 is as follows:
p2 ═ section quota level + load-power supply output)/new energy output rate + existing and planned new energy installed capacity
The selection of the load and the power supply time period is the same as the power supply output and the load selected by P1; and (3) determining the section to which the 220kV station belongs according to the comprehensive analysis of the grid structure of the section quota level, and determining the section quota level by combining the transmission quota of the 220kV line.
In step (2), the calculation formula of the maximum acceptable scale P4 for the grid interval resource condition evaluation is as follows:
p4 is 110kV available interval number x new energy scale allowed by the voltage level line +35kV available interval number x new energy scale allowed by the voltage level line + existing and planned new energy installed capacity
The number of the 110kV available intervals is 220kV substation 110kV final scale +110kV substation 110kV final scale-used 110kV intervals-110 kV intervals are planned to be used; the 35kV available interval number is 220kV transformer substation 35kV final scale +110kV transformer substation 35kV final scale-used 35kV interval-planned use 35kV interval; the new energy allowed by the 110kV line is 100MW, and the new energy allowed by the 35kV line is 40 MW.
In the step (3), the calculation formula of the power transmission capacity P6 of the 220kV grid is as follows:
p6 is new energy installed capacity accepted by power grid under important line or main transformer N-1 mode
And the installed capacity of the new energy which can be accepted by the power grid is the installed capacity of the existing new energy, the installed capacity of the planned new energy and the installed capacity of the new energy which meets the requirement of load flow calculation and verification and can be increased again by the power grid.
In the step (3), the full province peak regulation capacity is the peak regulation capacity of all the units except the new energy, the peak regulation capacity of the external unit, peak valley difference, load standby and accident standby;
if the full province peak regulation capacity-other region new energy admission capacity is less than P7, P8 is full province peak regulation space-other region new energy admission capacity, and if the full province peak regulation space-other region new energy admission capacity is more than or equal to P7, P8 is P7.
In conclusion, for the regional power grid, the analysis is performed on the sections such as the main transformer capacity, the interval resources and the uploading section, the new energy receiving capacity of each station is fully analyzed, and the later-stage new energy layout of the region is facilitated; the invention not only considers the self accepting capacity of the power grid in the area, but also analyzes the sending capacity and the full province peak regulation capacity of the power grid, and ensures that the accepting capacity of new energy in the area meets the requirements of sending out the power grid and the full province peak regulation.
Claims (1)
1. A method for evaluating the capacity of a regional power grid for accepting new energy is characterized by comprising the following steps: the method comprises the following steps in sequence:
(1) calculating the accepting capacity P1 of the main transformer capacity according to the transformation capacity balance, verifying the line sending capacity P2 according to the line quota level, and comparing the minimum value of the line sending capacity P2 with the minimum value to serve as the maximum possible accepting new energy installed theoretical value P3 of an upper sending section;
(2) evaluating the maximum admissible scale P4 according to the power grid interval resource condition, comparing the maximum admissible scale P4 with the theoretical value P3 of the maximum admissible new energy installed on the upper delivery section, and taking the minimum value as the theoretical value P5 of the maximum admissible new energy installed on the power grid;
(3) comparing the theoretical value P5 of the maximum admissible new energy installation of the power grid with the power transmission capacity P6 of the 220kV power grid, and taking the minimum value as the theoretical value P7 of the maximum admissible new energy installation of the power grid;
(4) determining a theoretical value P8 of the maximum admissible new energy installed machine of a local power grid by combining the new energy admitting ability of other areas on the basis of considering the peak regulation ability of the whole province;
in the step (1), the calculation formula of the main transformer capacity accepting capacity P1 is as follows:
p1= (main transformer capacity x power factor- (power supply output-load))/new energy output rate + existing and planned new energy installed capacity
Wherein, the capacity of the main transformer is calculated by a 220kV main transformer, and the power factor is 0.95;
the power supply output time interval is consistent with the load selected time interval, and the maximum time interval of subtraction of the power supply output time interval and the load selected time interval is selected according to the load characteristic analysis and the new energy output characteristic;
the power supply output = biomass, garbage, various units of the gas turbine x service power + existing and planned new energy installed capacity x new energy output rate;
load = annual maximum load for each site x percentage of this time period load to annual maximum load;
the new energy output rate is selected in the following mode: analyzing 8760-hour output data of the new energy power station which is put into operation in the area or the periphery to obtain the month and the time period of the new energy heavy hair and the output rate value of the new energy;
the load characteristic analysis means: researching 8760-hour load data of 3-5 years of regional history, obtaining load valley months, typical daily load peak and valley periods of each season by analyzing annual load curves and typical daily load curves of four seasons, and determining the percentage of the load in the period accounting for the maximum load of the whole year according to the period of heavy new energy occurrence;
in step (1), the calculation formula of the line quota level verification line sending capability P2 is as follows:
p2= (section quota level + load-power supply output)/new energy output rate + existing and planned new energy installed capacity
The selection of the load and the power supply time period is the same as the power supply output and the load selected by P1; the section quota level = the section receiving power capability-the section sending power capability, the section quota level determines the section of the 220kV station according to the grid structure comprehensive analysis, and the section quota level is determined by combining the transmission quota of the 220kV line;
in step (2), the calculation formula of the maximum acceptable scale P4 for the grid interval resource condition evaluation is as follows:
p4=110kV available interval number × new energy scale allowed by the voltage class line +35kV available interval number × new energy scale allowed by the voltage class line + existing and planned new energy installed capacity
Wherein the number of available 110kV intervals =220kV substation 110kV final scale +110kV substation 110kV final scale-used 110kV intervals-planned use of 110kV intervals; the number of available 35kV intervals = 35kV final-stage scale of 220kV transformer substation +35kV final-stage scale of 110kV transformer substation-used 35kV intervals-planned use of 35kV intervals; the allowable new energy scale of the 110kV line is 100MW, and the allowable new energy scale of the 35kV line is 40 MW;
in the step (3), the calculation formula of the power transmission capacity P6 of the 220kV grid is as follows:
p6= new energy installed capacity accepted by power grid under N-1 mode of important line or main transformer of power grid
The method comprises the following steps that the installed capacity of new energy receivable by a power grid = the installed capacity of the existing new energy + the installed capacity of the planned new energy + the installed capacity of the new energy which meets the requirement of load flow calculation and verification and can be increased again by the power grid;
in the step (3), the full province peak regulation capability = the peak regulation capability of all types of units except new energy + the peak regulation capability of the external units, peak valley difference, load standby and accident standby;
if the full-province peak shaving capacity-other-region new energy admission capacity is less than P7, P8= full-province peak shaving space-other-region new energy admission capacity, and if the full-province peak shaving space-other-region new energy admission capacity is more than or equal to P7, P8= P7.
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