CN114003860A - Method for measuring and calculating new energy bearing capacity of regional power grid considering interval power exchange - Google Patents
Method for measuring and calculating new energy bearing capacity of regional power grid considering interval power exchange Download PDFInfo
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Abstract
The invention discloses a method for measuring and calculating the new energy bearing capacity of a regional power grid considering interval power exchange, which comprises the steps of firstly measuring and calculating a new energy installation basic scheme of each partition of a planning year, providing a data base for measuring and calculating the new energy bearing capacity of a target region of the planning year, then measuring and calculating the interval power flow exchange condition through power and electricity balance calculation, providing an influence factor for measuring and calculating the new energy bearing capacity of the target region of the planning year, finally sequentially determining a regional power flow delivery section bayonet in a small-size mode and a high-speed mode and the influence relation between the interval power flow exchange and the bearing capacity of a wind power machine and the photovoltaic installation bearing capacity in the region in the small-size mode and the high-speed mode through power flow calculation, N-1 verification and sensitivity analysis, innovatively considering the influence of the interval power flow exchange on the new energy bearing capacity of the regional power grid, and providing more practical guidance for scheduling and planning decision of new energy in the operation of the power grid, and a scientific basis is provided for planning and constructing a grid structure and a power supply structure.
Description
Technical Field
The invention belongs to the technical field of power system automation, and particularly relates to a method for measuring and calculating new energy bearing capacity of a regional power grid in consideration of interval power exchange.
Background
In a regional power grid with the increased proportion of new energy, the reasonable arrangement of the power grid operation mode and the planning and design of the power grid structure must fully consider the bearing capacity of the power grid to the new energy, so that the safe operation of the power grid and the reliable consumption of the new energy can be guaranteed. By dynamically analyzing the new energy bearing capacity of the power grid in the affected area, the method has important significance for further controlling the new energy bearing capacity and improving the scheduling decision capability.
At present, a method for measuring and calculating the new energy bearing capacity of a regional power grid mainly adopts two modes: one is based on different matching strategies of wind power and energy storage, and the consumption capacity of new energy is evaluated by a determined power supply structure and peak regulation capacity; and the other type of the method is to evaluate and optimize the wind power output process by taking the lowest conventional energy power generation cost as a target, realize economic dispatch by responding to the output fluctuation of wind power through the standby reasonable application of a power grid, and evaluate the wind power accepting capacity of the power grid through active power balance. The existing method for evaluating the bearing capacity of the new energy is limited to the analysis of the system on the admission capacity of the new energy, the influence of inter-region power exchange on the bayonets of the regional power grid output and the bearing capacity of the new energy cannot be fully considered, and the new energy bearing not only means that the new energy is completely admitted at all costs, but also seeks the comprehensive balance of all aspects of the bearing capacity of the system.
In view of the above, the method for measuring and calculating the new energy bearing capacity of the regional power grid considering the interval power exchange is researched in consideration of the influence of the interval power exchange on the new energy bearing capacity in the region, and has an important practical value for solving the practical difficulties faced by planning designers and scheduling decision makers.
Disclosure of Invention
Aiming at the technical problems, the invention provides a method for measuring and calculating the new energy bearing capacity of a regional power grid in consideration of interval power exchange.
The technical scheme adopted by the invention for solving the technical problems is as follows:
the method for measuring and calculating the new energy bearing capacity of the regional power grid in consideration of interval power exchange comprises the following steps:
step S100: the method comprises the steps of statistically analyzing the layout of the existing subarea new energy installation and the distribution condition of new energy project under construction, determining the distribution proportion of the new energy installation among the subareas, and measuring and calculating the basic scheme of the new energy installation of each subarea in a planning year;
step S200: carrying out electric power and electric quantity balance calculation according to a basic scheme of new energy installation of each partition of a planning year, and measuring and calculating the electric power exchange condition of a target area of the planning year in a small-abundance mode and a mid-abundance mode to obtain electric power and electric quantity balance results of the target area in the small-abundance mode and the mid-abundance mode;
step S300: acquiring a grid structure, load data and power distribution conditions of a planned year, performing load flow calculation by combining power and electric quantity balance results of a target area in a small-size mode and a midday mode, performing N-1 verification on the basis of the load flow calculation to obtain calculation results in the small-size mode and the midday mode, and determining a regional load flow delivery section bayonet in the small-size mode and a regional load flow delivery section bayonet in the midday mode according to the calculation results in the small-size mode and the midday mode;
step S400: according to the new energy installation basic scheme, the small-abundance mode and the calculation result of the mid-abundance mode of each subarea in the planning year, the wind power installation bearing capacity of the target area under the condition of meeting the tidal current limit of the regional tidal current outward-sending section bayonet under the small-abundance mode and the photovoltaic installation bearing capacity of the target area under the condition of meeting the tidal current limit of the regional tidal current outward-sending section bayonet under the mid-abundance mode are calculated and obtained;
step S500: analyzing the influence of the power exchange change of a target region in a planning year in a small-large mode and the change of a wind power installation in the target region on the power flow change of a power flow delivery section bayonet of the target region to obtain a sensitivity analysis result in the small-large mode, and obtaining the influence relation of the interval power exchange change on the bearing capacity of the wind power installation in the target region by combining a power flow calculation method and a preset power flow limit of the power flow delivery section bayonet of the target region in the small-large mode;
step S600: analyzing the influence of the power exchange change of a target area in a planning year in a Feng-noon mode and the change of the photovoltaic installation in the target area on the power flow change of a power flow delivery section bayonet of the target area to obtain a sensitivity analysis result in the Feng-noon mode, and combining a power flow calculation method and a preset power flow limit of the power flow delivery section bayonet of the target area to obtain the influence relation of the interval power exchange change on the bearing capacity of the photovoltaic installation in the target area.
Preferably, the layout of the existing partitioned new energy installation machine comprises the current scales of the wind power general installation machine and the photovoltaic general installation machine and the current scales of the wind power installation machine and the photovoltaic installation machine of each partition, the distribution situation of the project of building new energy comprises the scales of the wind power general installation machine and the photovoltaic general installation machine which are clearly defined at present and the scales of the wind power installation machine and the photovoltaic installation machine which are clearly defined by each partition, the basic scheme of the new energy installation machine of each partition in the planning year comprises the scales of the wind power installation machine and the photovoltaic installation machine of each partition in the planning year, and the step S100 comprises the following steps:
step S110: the method comprises the steps of statistically analyzing the scale of a current wind power general installation, the scale of a current photovoltaic general installation, the scale of the current wind power installation and the photovoltaic installation of each partition, determining the scale of the wind power general installation and the photovoltaic general installation to be built at present, and the scale of the wind power installation and the photovoltaic installation to be built for each partition;
step S120: and calculating according to the distribution proportion of the new energy installation machines among the partitions, the preset total installation scale of the whole planned year, the current wind power total installation scale, the current photovoltaic total installation scale, the current wind power installation and photovoltaic installation scale of each partition, the current wind power installation and photovoltaic installation scale of the to-be-built wind power total installation and photovoltaic total installation scale of each partition and the current wind power installation and photovoltaic installation scale of each partition to be-built.
Preferably, step S120 is specifically:
wherein, PNFor a predetermined planned annual total installed scale, FNFor planning the wind power total installed scale of the whole annual district, GNFor planning the installation scale of the entire region of the year, FN1～FNnFor planning the installed scale of wind power in each division of the year, GN1～GNnTo plan the installed photovoltaic scale of each sector of the year, F01～F0nFor the installed scale of the wind power of the current sub-areas, F11～F1nThe installed scale of the wind turbine to be constructed is determined for each sub-area, G01～G0nTo plan the installed photovoltaic scale of each sector of the year, G11～G1nThe installation scale of the photovoltaic system to be built is determined for each section.
Preferably, the calculation result in the feng xiao mode and the feng noon mode is the maximum power flow in each power grid line between the target interval and other adjacent intervals in the feng xiao mode and the feng noon mode, and the step S300 includes:
step S310: acquiring a grid structure, load data and a power distribution condition of a planned year, and performing power flow calculation of power grid lines between a target area and other adjacent areas in the Feng mode and the Feng noon mode by combining power and electric quantity balance results of the target area in the Feng mode and the Feng mode to respectively obtain a power flow calculation result in the Feng mode and a power flow calculation result in the Feng mode;
step S320: and respectively performing 'N-1' check based on the flow calculation result in the Feng mode and the flow calculation result in the Feng noon mode, determining the maximum flow in each power grid line of the target interval and other adjacent intervals in the Feng mode and the Feng noon mode, and further respectively determining a regional flow delivery section bayonet in the Feng mode and a regional flow delivery section bayonet in the Feng mode.
Preferably, step S400 includes:
step S410: according to a new energy installation basic scheme of each subarea in a planning year and the maximum power flow measurement and calculation in each power grid line of a target interval and other adjacent intervals in a small and rich mode, the wind power installation bearing capacity of the target area under the condition of meeting the power flow limit of a regional power flow delivery section bayonet in the small and rich mode is obtained;
step S420: and obtaining the photovoltaic installation bearing capacity of the target area under the condition of meeting the tidal current limit of the regional tidal current delivery section bayonet under the Feng noon mode according to the wind power installation bearing capacity of the target area under the condition of the tidal current limit of the regional tidal current delivery section bayonet under the Feng Xiao mode, a new energy installation basic scheme of each partition of a planning year and the maximum tidal current in each power grid line of the target interval and other adjacent intervals under the Feng noon mode.
Preferably, step S410 is specifically:
wherein, FNxFor wind power installation bearing capacity in the target area in small and large mode, GNxFor the bearing capacity of the photovoltaic installation in the target area in a small and large manner, CLxIs the current limit of a region current outward-sending section bayonet under a preset small and large mode, S1For the power-electricity balance result of the target area in the small and large mode, FNThe method is used for planning the wind power total installation scale of the whole annual area.
Preferably, step S420 is specifically:
wherein, FNwFor the wind power installation bearing capacity in the target area in the Feng-noon mode, FNxFor wind power installation bearing capacity in the target area in small and large mode, GNwFor the bearing capacity of the photovoltaic installation in the target area in the Feng-noon mode, CLwIs the preset tidal current limit of the regional tidal current outward-sending section bayonet in the Feng 'ang' S mode2For the power and electric quantity balance result of the target area in Feng noon mode, GNThe method is used for planning the photovoltaic total installation scale of the whole annual area.
The method for measuring and calculating the new energy bearing capacity of the regional power grid considering the interval power exchange comprises the steps of firstly measuring and calculating a new energy installation basic scheme in a target region corresponding to a planned annual province total installation, and providing a data basis for measuring and calculating the new energy bearing capacity of the planned annual target region; then, calculating the interval power flow exchange condition through power and electricity balance calculation, and providing an influence factor for calculating the new energy bearing capacity of a planned annual target area; and finally, determining influence relations between regional tide delivery section bayonets in the small-size mode and the mid-day mode and between regional power flow exchange and bearing capacity of wind power machines and photovoltaic installation in the region in the small-size mode and the mid-day mode in sequence through tide calculation, N-1 verification and sensitivity analysis, innovatively considering the influence of the regional power flow exchange on the bearing capacity of the regional power grid, and providing more practical and reliable guidance for making new energy scheduling and planning decisions in the operation of the power grid.
Drawings
Fig. 1 is a flowchart of a method for measuring and calculating a new energy bearing capacity of a regional power grid in consideration of inter-region power exchange according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a method for measuring and calculating a new energy bearing capacity of a regional power grid in consideration of inter-region power exchange according to an embodiment of the present invention.
Detailed Description
In order to make the technical solutions of the present invention better understood, the present invention is further described in detail below with reference to the accompanying drawings.
In one embodiment, as shown in fig. 1, a method for calculating a new energy carrying capacity of a regional power grid considering inter-regional power exchange includes the following steps:
step S100: the method comprises the steps of carrying out statistical analysis on the layout of the existing subarea new energy installation machine and the distribution condition of new energy project under construction, determining the distribution proportion of the new energy installation machine among the subareas, and measuring and calculating the basic scheme of the new energy installation machine of each subarea in the planning year.
In one embodiment, the layout of the existing partitioned new energy installation machines includes current scales of the wind power generation total installation machine and the photovoltaic total installation machine, and current scales of the wind power installation machine and the photovoltaic installation machine of each partition, the distribution situation of the project of building new energy includes scales of the wind power generation total installation machine and the photovoltaic total installation machine which are clearly defined at present and scales of the wind power installation machine and the photovoltaic installation machine which are clearly defined by each partition, the basic scheme of the new energy installation machine of each partition in the planning year includes scales of the wind power installation machine and the photovoltaic installation machine of each partition in the planning year, and the step S100 includes:
step S110: the method comprises the steps of statistically analyzing the scale of a current wind power general installation, the scale of a current photovoltaic general installation, the scale of the current wind power installation and the photovoltaic installation of each partition, determining the scale of the wind power general installation and the photovoltaic general installation to be built at present, and the scale of the wind power installation and the photovoltaic installation to be built for each partition;
step S120: and calculating according to the distribution proportion of the new energy installation machines among the partitions, the preset total installation scale of the whole planned year, the current wind power total installation scale, the current photovoltaic total installation scale, the current wind power installation and photovoltaic installation scale of each partition, the current wind power installation and photovoltaic installation scale of the to-be-built wind power total installation and photovoltaic total installation scale of each partition and the current wind power installation and photovoltaic installation scale of each partition to be-built.
Specifically, the new energy distribution proportional relation refers to the proportion of the total installed sum of each subarea, and the new energy installed basic scheme refers to the installed scale of the new energy obtained according to the current new energy distribution proportional relation under the condition that the total installed sum of all subareas in the planning year is determined.
The existing integrated wind power installation machine is F0The photovoltaic installation is G0The current situation target area 1 wind power installation machine is F01The photovoltaic installation is G01The current situation region 2 wind power installation machine is F02The photovoltaic installation is G02The other areas are analogized in that F0、F01、F02、F03、F0n、G0、G01、G02、G03、G0nAre all statistical data.
F0＝F01+F02+F03…F0n
G0＝G01+G02+G03…G0n
The established wind power installation machine to be built is F1The photovoltaic installation is G1The current situation target area 1 wind power installation machine is F11The photovoltaic installation is G11The current situation region 2 wind power installation machine is F12The photovoltaic installation is G12The other areas are analogized in that F1、F11、F12、F13、F1n、G1、G11、G12、G13、G1nAre all statistical data.
F1＝F11+F12+F13+…F1n
G1＝G11+G12+G13+…G1n
The planning year integral wind power installation is FNThe photovoltaic installation is GNThe wind power installation machine of the target area 1 is FN1The photovoltaic installation is GN1The current situation region 2 wind power installation machine is FN2The photovoltaic installation is GN2And so on for other areas.
FN＝FN1+FN2+FN3+…FNn
GN＝GN1+GN2+GN3+…GNn
FN1:FN2:FN3:…:FNn＝(F01+F11):(F02+F12):(F03+F13):…:(F0n+F1n)
GN1:GN2:GN3:…:GNn＝(G01+G11):(G02+G12):(G03+G13):…:(G0n+G1n)
F0+F1<FN
G0+G1<GN
Wherein FN，GNAs is known, this step can give FN1、FN2、FN3…FNnAnd GN1、GN2、GN3…GNnThese two sets of data are referred to as the basic scheme for new energy.
In one embodiment, step S120 specifically includes:
wherein, PNFor a predetermined planned annual total installed scale, FNFor planning the wind power total installed scale of the whole annual district, GNFor planning the installation scale of the entire region of the year, FN1～FNnFor planning the installed scale of wind power in each division of the year, GN1～GNnTo plan the installed photovoltaic scale of each sector of the year, F01～F0nFor the installed scale of the wind power of the current sub-areas, F11～F1nFor each partitionThe installed scale of the wind power to be built is determined, G01～G0nTo plan the installed photovoltaic scale of each sector of the year, G11～G1nThe installation scale of the photovoltaic system to be built is determined for each section.
Step S200: and carrying out electric power and electric quantity balance calculation according to the basic scheme of the new energy installation of each partition of the planning year, and measuring and calculating the electric power exchange condition of the target area of the planning year in the small-abundance mode and the mid-abundance mode to obtain the electric power and electric quantity balance result of the target area in the small-abundance mode and the mid-abundance mode.
Specifically, considering the installation structure of a power supply in an area, in the area with more water and electricity, affected by the peak regulation capacity, the interval delivery is the most serious under the conditions of small and medium modes, so that only two conditions of small and medium modes are considered in the measurement and calculation process of the bearing capacity of new energy in the area, the small mode refers to a specific mode (generally 2:00-5:00 in 3-5 months in the morning) with small load in the water-rich period, and in the mode, the wind power output is large, the photovoltaic output is not generated, the load is generally small, and the area delivery is large. This approach can be used to determine the maximum bearing capacity of the wind installation. The Feng noon mode refers to a specific mode (generally 12:00-14:00 noon in 3-5 months) in the midsumn of the rich water period, and in the mode, the wind power output is slightly smaller than that in the rich mode, the photovoltaic output is larger, and the area delivery is larger. The maximum bearing capacity of the photovoltaic installation can be determined by combining the determined wind power bearing capacity in the small and rich mode.
As shown in fig. 2, taking the power exchange between the target area 1 and the areas 2 and 3 as an example, the power-electricity balance calculation is a common calculation method for estimating the area incoming or outgoing power. The maximum load of each region is known in the planning year, and coal electricity, water electricity and wind electricity (F) in the region are knownN1、FN2、FN3…FNn) Photovoltaic (G)N1、GN2、GN3…GNn) Biomass, pumped storage, gas-electricity, stored energy various types of power installations are known. The power-electricity balance calculation can be used to obtain the power flow situation that the target area 1 needs to perform interval exchange with the areas 2 and 3 in a typical mode. Similarly, the power-electricity balance calculation is performed for the area 2 and the area 3, and the power-electricity balance can be obtainedAnd (6) obtaining the result. Suppose that the power and electric quantity balance result of the 1 rich and small mode of the target area is X1The balance result of the electric power and the electric quantity in the Feng noon mode is W1And the power and electric quantity balance result in the small and large mode of the area 2 is X2The balance result of the electric power and the electric quantity in the Toyobo mode is W2And the power and electric quantity balance result in the small and large mode of the area 3 is X3The balance result of the electric power and the electric quantity in the Feng noon mode is W3。
From the power-electricity balance result, in combination with the network structure, the result of inter-zone power flow exchange can be obtained, and it is assumed that both the target zone 1 and the zone 2 are surplus power and need to send out power. Power exchange S between a small scale area 2 and a target area 112＝X2Power exchange S between zone 3 and target zone 113＝X1+X2. From the grid configuration point of view, the power delivery of area 2, i.e. the power admission of area 1, S12、S13Is the defined power exchange S. Feng Wu mode S12＝W2、S13＝W1+W2. The power and electric quantity balance result between corresponding areas in the small and large mode is corresponding to S in the formula1The power and electric quantity balance result between corresponding areas in the Feng noon mode corresponds to S in a formula2。
The calculation of the power-electricity balance is an ideal estimation, the actual power-electricity exchange condition generally fluctuates in an interval, and the fluctuation range is influenced by the power grid structure, namely SminAnd Smax(known). S12And S13Respectively have different corresponding SminAnd Smax。
Step S300: acquiring a grid structure, load data and power distribution conditions of a planned year, performing load flow calculation by combining power and electric quantity balance results of a target area in a small-size mode and a mid-day mode, performing N-1 verification on the basis of the load flow calculation to obtain calculation results in the small-size mode and the mid-day mode, and determining a regional load flow delivery section bayonet in the small-size mode and a regional load flow delivery section bayonet in the mid-day mode according to the calculation results in the small-size mode and the mid-day mode.
In an embodiment, the calculation results in the feng xiao mode and the feng noon mode are maximum power flows in each grid line between the target interval and other adjacent intervals in the feng xiao mode and the feng noon mode, and the step S300 includes:
step S310: acquiring a grid structure, load data and a power distribution condition of a planned year, and performing power flow calculation of power grid lines between a target area and other adjacent areas in the Feng mode and the Feng noon mode by combining power and electric quantity balance results of the target area in the Feng mode and the Feng mode to respectively obtain a power flow calculation result in the Feng mode and a power flow calculation result in the Feng mode;
step S320: and respectively performing 'N-1' check based on the flow calculation result in the Feng mode and the flow calculation result in the Feng noon mode, determining the maximum flow in each power grid line of the target interval and other adjacent intervals in the Feng mode and the Feng noon mode, and further respectively determining a regional flow delivery section bayonet in the Feng mode and a regional flow delivery section bayonet in the Feng mode.
Specifically, a grid structure (including substation parameters and line parameters) of a planned year, load data (load data of each substation), and a power distribution condition (which substation each type of substation is connected to) are obtained, a load flow calculation database is established according to the grid structure, the load data, and the power distribution condition of the planned year, load flow calculation and 'N-1' check are performed by using special software such as BPA (business process analysis), the purpose of the load flow calculation is to obtain how the power electric quantity balance result S of the step S200 is distributed in an actual grid, and a connecting line closest to the limited transmission capacity is determined according to the load flow calculation and the 'N-1' result, and the connecting line is an outgoing section bayonet.
Suppose that step S200 calculates the small and large mode S13＝5000MW，S122000 MW. There are 3 lines of the power grid between the target area 1 and the area 3, and 3 lines of the power grid between the target area 1 and the area 2, and the result of the power flow calculation can obtain that the 1 st loop power flow between the area 1 and the area 3 is 1300MW, the second loop power flow is 2000MW, and the third loop power flow is 1700 MW. Similarly, between region 1 and region 2The results for each line in between can also be derived.
"N-1" is a common safety and stability measure for the power grid, and means that in the case of fault or maintenance of any line of the power grid, other lines meet the requirement of power transmission. That is, one of the links between the target area 1 and the area 3 is arbitrarily canceled at the time of calculation, and the remaining two links satisfy S13The transfer of power exchange.
However, each line has its ultimate delivery capacity, which is a physical property beyond which the line will fail (blow). Assuming a 3-grid line between target zone 1 and zone 3, the ultimate delivery capacities are 2000MW, 3000MW, 2000MW, respectively. On the basis of the power flow calculation result, N-1 calculation is carried out, and the power flow of the line 1 is 1500MW at most, the power flow of the line 2 is 2400MW at most, and the power flow of the line 3 is 1900MW at most. The line 3 is determined as the current outgoing section bayonet if the line current emerging from the line 3 is closest to its limit transport capacity.
Step S400: and according to the calculation results of the new energy installation basic scheme, the small-feng mode and the mid-feng mode of each subarea in the planning year, the wind power installation bearing capacity of the target area under the condition of meeting the tidal current limit of the regional tidal current outward-sending section bayonet under the small-feng mode and the photovoltaic installation bearing capacity of the target area under the condition of meeting the tidal current limit of the regional tidal current outward-sending section bayonet under the mid-feng mode are calculated.
In particular, the tidal current limit of a bayonet refers to the limit delivery capacity of the link determined as a bayonet. Because the development capability of the biomass energy is limited and is limited by resources at present, only wind power and photovoltaic are considered in the measurement and calculation process of the bearing capacity of the new energy in the region.
In one embodiment, step S400 includes:
step S410: according to a new energy installation basic scheme of each subarea in a planning year and the maximum power flow measurement and calculation in each power grid line of a target interval and other adjacent intervals in a small and rich mode, the wind power installation bearing capacity of the target area under the condition of meeting the power flow limit of a regional power flow delivery section bayonet in the small and rich mode is obtained;
step S420: and obtaining the photovoltaic installation bearing capacity of the target area under the condition of meeting the tidal current limit of the regional tidal current delivery section bayonet under the Feng noon mode according to the wind power installation bearing capacity of the target area under the condition of the tidal current limit of the regional tidal current delivery section bayonet under the Feng Xiao mode, a new energy installation basic scheme of each partition of a planning year and the maximum tidal current in each power grid line of the target interval and other adjacent intervals under the Feng noon mode.
Specifically, for example in the small-size mode, it has been determined in step S300 that the line 3 is the outgoing section bayonet, and the new energy installation machines in the target area 1 are respectively F obtained in step S100N1、GN1And the maximum power flow of the outgoing line of the line 3 is 1900, the limit transmission capacity is not reached yet, the scale of the wind power installation in the region is continuously increased, the maximum power flow of the outgoing line of the line 3 is enabled to reach 2000MW (limit transmission capacity), and at the moment, the corresponding scale F of the wind power installation in the target region is achievedNxNamely, the bearing capacity of the wind power installation machine in the target area under the condition of meeting the bayonet tide limit is assumed to be FNx6000 MW. In addition, note that F hereNxThe corresponding out-of-zone power feed (zone 2 to zone 1 feed) is S122000 MW. Similarly, the method for determining the bearing capacity of the photovoltaic installation of the target area in the afternoon mode is consistent with the method for determining the bearing capacity of the wind power installation of the target area in the small mode.
In one embodiment, step S410 specifically includes:
wherein, FNxFor wind power installation bearing capacity in the target area in small and large mode, GNxFor the bearing capacity of the photovoltaic installation in the target area in a small and large manner, CLxIs the current limit of a region current outward-sending section bayonet under a preset small and large mode, S1For the power-electricity balance result of the target area in the small and large mode, FNThe method is used for planning the wind power total installation scale of the whole annual area.
In one embodiment, step S420 specifically includes:
wherein, FNwFor the wind power installation bearing capacity in the target area in the Feng-noon mode, FNxFor wind power installation bearing capacity in the target area in small and large mode, GNwFor the bearing capacity of the photovoltaic installation in the target area in the Feng-noon mode, CLwIs the preset tidal current limit of the regional tidal current outward-sending section bayonet in the Feng 'ang' S mode2For the power and electric quantity balance result of the target area in Feng noon mode, GNThe method is used for planning the photovoltaic total installation scale of the whole annual area.
Step S500: analyzing the influence of the power exchange change of a target region in a planning year in a small-large mode and the change of a wind power installation in the target region on the power flow change of a power flow delivery section bayonet of the target region to obtain a sensitivity analysis result in the small-large mode, and combining a power flow calculation method and a preset power flow limit of the power flow delivery section bayonet of the target region to obtain the influence relation of the power exchange change of the region on the bearing capacity of the wind power installation in the target region.
Step S600: analyzing the influence of the power exchange change of a target area in a planning year in a Feng-noon mode and the change of the photovoltaic installation in the target area on the power flow change of a power flow delivery section bayonet of the target area to obtain a sensitivity analysis result in the Feng-noon mode, and combining a power flow calculation method and a preset power flow limit of the power flow delivery section bayonet of the target area to obtain the influence relation of the interval power exchange change on the bearing capacity of the photovoltaic installation in the target area.
Specifically, taking the robust mode as an example, the sensitivity analysis is a commonly used calculation method for analyzing the influence degree of the change of the independent variable on the change of the dependent variable. The purpose of sensitivity analysis is to analyze the influence of the change of power exchange between intervals and the change of wind power installations in a region on the power change of a regional power flow outgoing section. The interval power exchange and the in-region wind power generator are independent variables, and the bayonet transmission power flow is a dependent variable. Target area wind power installationMachine FN1Increasing 100MW, increasing 10MW for the bayonet link power flow of the target region, so that the sensitivity of the bayonet link power flow to the wind power installation in the region is 10/100 0.1, and the interval power exchange S12Increasing 100MW, changing from 2000MW to 2100MW, increasing 20MW in the target region's bayonet link power flow, then the sensitivity of the bayonet link power flow to the inter-zone power exchange is 20/100 0.2.
Step S410 shows that when S12When equal to 2000MW, FNx6000MW, the sensitivity of the bayonet link tide to the wind power installation in the region is 0.1, and the sensitivity of the bayonet link tide to the interval power exchange is 0.2, which is obtained in step 500. Then, the relation between the interval power exchange and the wind power bearing capacity of the target area can be obtained, under the condition that safe operation of the bayonet connecting line is guaranteed (the transmission power flow does not exceed the limit), the power outside the area is increased by 100MW, the wind power bearing capacity inside the target area is reduced by 200MW, and when S is used, the load of the wind power inside the target area is reduced by 200MW12At 2100MW, FNxAnd determining the influence relationship of the inter-zone power exchange change on the bearing capacity of the wind power installation in the target area, wherein the '5800 MW' is the result. Similarly, the measuring and calculating mode of the influence relation of the change of the power exchange between the time and the day on the bearing capacity of the photovoltaic installation in the target area is the same.
Step S500 innovatively considers the influence of interval power exchange on the bearing capacity of the wind power installation under the small and large mode, and the bearing capacity of the wind power installation in the region can be rapidly measured and calculated under the condition of different interval power exchange. Step S600 innovatively considers the influence of interval power exchange on the bearing capacity of the photovoltaic installation in the Feng noon mode, and the bearing capacity of the photovoltaic installation in the area can be rapidly measured and calculated under the condition of different interval power exchange.
In one embodiment, step S500 specifically includes:
specifically, S1For the power-electricity balance result of the target area in the small and large mode, S1minFor planning the lower limit of the target area power exchange in the annual bumper mode, S1maxFor planning the upper limit of the target area power exchange in the annual abundance mode, the formula shows that the power flow at the power flow delivery section bayonet of the target area is just the power flow limit value CLxWhile, the total power S is supplied to the outside of the target area1Under the condition of satisfying S1min～S1maxWhen the range of (2) is changed, the bearing capacity F of the wind power installation in the area isNxWill also follow S1A variation occurs.
In one embodiment, step S600 specifically includes:
specifically, S2Is the power and electric quantity balance result of the target area in the Feng noon mode, S2minFor planning the lower limit of the power exchange in the target area in the annual Toyobo noon mode, S2maxFor planning the upper limit of the power exchange of the target area in the annual Toyobo noon mode, the formula shows that when the power flow at the bayonet of the power flow outgoing section of the target area is just the power flow limit value CLwWhile, the total power S is supplied to the outside of the target area2Under the condition of satisfying S2min～S2maxWithin the range of (3), the bearing capacity G of the photovoltaic installation in the areaNwWill also follow S2A variation occurs.
The method for measuring and calculating the new energy bearing capacity of the regional power grid considering the interval power exchange comprises the steps of firstly measuring and calculating a new energy installation basic scheme in a target region corresponding to a planned annual province total installation, and providing a data basis for measuring and calculating the new energy bearing capacity of the planned annual target region; then, calculating the interval power flow exchange condition through power and electricity balance calculation, and providing an influence factor for calculating the new energy bearing capacity of a planned annual target area; and finally, sequentially determining the influence relationship between regional tide delivery section bayonets in the small-size mode and the large-size mode and the influence relationship between the inter-regional power flow exchange and the bearing capacity of the wind power machines and the bearing capacity of the photovoltaic installation in the region in the small-size mode and the large-size mode through tide calculation, N-1 verification and sensitivity analysis. The method innovatively considers the influence of the interval power flow exchange on the new energy bearing capacity of the regional power grid, and provides more practical and reliable guidance for making new energy scheduling and planning decisions in the operation of the power grid.
The method for measuring and calculating the new energy bearing capacity of the regional power grid considering the interval power exchange provided by the invention is described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the core concepts of the present invention. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (7)
1. The method for measuring and calculating the new energy bearing capacity of the regional power grid in consideration of interval power exchange is characterized by comprising the following steps of:
step S100: the method comprises the steps of statistically analyzing the layout of the existing subarea new energy installation and the distribution condition of new energy project under construction, determining the distribution proportion of the new energy installation among the subareas, and measuring and calculating the basic scheme of the new energy installation of each subarea in a planning year;
step S200: carrying out electric power and electric quantity balance calculation according to the basic scheme of the new energy installation of each partition of the planned year, and measuring and calculating the electric power exchange condition of the target area of the planned year in the small-abundance mode and the mid-abundance mode to obtain the electric power and electric quantity balance result of the target area in the small-abundance mode and the mid-abundance mode;
step S300: acquiring a grid structure, load data and power distribution conditions of a planned year, performing load flow calculation by combining power and electric quantity balance results of a target area in a small-size mode and a mid-day mode, performing N-1 verification on the basis of the load flow calculation to obtain calculation results in the small-size mode and the mid-day mode, and determining a regional load flow delivery section bayonet in the small-size mode and a regional load flow delivery section bayonet in the mid-day mode according to the calculation results in the small-size mode and the mid-day mode;
step S400: according to the new energy installation basic scheme of each subarea of the planning year, the calculation results of the small-abundance mode and the mid-abundance mode, the wind power installation bearing capacity of the target area under the condition of meeting the tidal current limit of the regional tidal current outward-sending section bayonet under the small-abundance mode and the photovoltaic installation bearing capacity of the target area under the condition of meeting the tidal current limit of the regional tidal current outward-sending section bayonet under the mid-abundance mode are calculated;
step S500: analyzing the influence of the power exchange change of a target region in a planning year in a small-large mode and the wind power installation change in the target region on the power flow change of a power flow delivery section bayonet of the target region to obtain a sensitivity analysis result in the small-large mode, and combining a power flow calculation method and the power flow limit of the power flow delivery section bayonet of the target region to obtain the influence relation of the power exchange change of the region on the wind power installation bearing capacity in the target region;
step S600: analyzing the influence of the power exchange change of a target area in a planning year in a Feng-noon mode and the change of the photovoltaic installation in the target area on the power flow change of a power flow delivery section bayonet of the target area to obtain a sensitivity analysis result in the Feng-noon mode, and combining a power flow calculation method and a preset power flow limit of the power flow delivery section bayonet of the target area to obtain the influence relation of the interval power exchange change on the bearing capacity of the photovoltaic installation in the target area.
2. The method according to claim 1, wherein the layout of the existing partitioned new energy installation machines comprises current scales of the wind power installation machine and the photovoltaic installation machine, and current scales of the wind power installation machine and the photovoltaic installation machine of each partition, the distribution situation of the new energy project under construction comprises scales of the wind power installation machine and the photovoltaic installation machine which are clearly to be constructed at present, and scales of the wind power installation machine and the photovoltaic installation machine which are clearly to be constructed at each partition, the basic scheme of the new energy installation machine of each partition in the planning year comprises scales of the wind power installation machine and the photovoltaic installation machine of each partition in the planning year, and the step S100 comprises:
step S110: the method comprises the steps of statistically analyzing the scale of a current wind power general installation, the scale of a current photovoltaic general installation, the scale of the current wind power installation and the photovoltaic installation of each partition, determining the scale of the wind power general installation and the photovoltaic general installation to be built at present, and the scale of the wind power installation and the photovoltaic installation to be built for each partition;
step S120: and calculating according to the distribution proportion of the new energy installation machines among the partitions, the preset total installation scale of the whole planned year, the current wind power total installation scale, the current photovoltaic total installation scale, the current wind power installation and photovoltaic installation scale of each partition, the current wind power installation and photovoltaic installation scale of the to-be-built wind power total installation and photovoltaic total installation scale of each partition and the current wind power installation and photovoltaic installation scale of each partition to be-built.
3. The method according to claim 2, wherein step S120 is specifically:
wherein, PNFor a predetermined planned annual total installed scale, FNFor planning the wind power total installed scale of the whole annual district, GNFor planning the installation scale of the entire region of the year, FN1～FNnFor planning the installed scale of wind power in each division of the year, GN1～GNnTo plan the installed photovoltaic scale of each sector of the year, F01～F0nFor the installed scale of the wind power of the current sub-areas, F11～F1nThe installed scale of the wind turbine to be constructed is determined for each sub-area, G01～G0nTo plan the installed photovoltaic scale of each sector of the year, G11～G1nThe installation scale of the photovoltaic system to be built is determined for each section.
4. The method according to claim 3, wherein the calculation results in the feng mode and the feng noon mode are maximum power flows in each grid line of the target interval and other adjacent intervals in the feng mode and the feng noon mode, and the step S300 includes:
step S310: acquiring a grid structure, load data and a power distribution condition of a planned year, and performing power flow calculation of power grid lines between a target area and other adjacent areas in the Feng mode and the Feng noon mode by combining power and electric quantity balance results of the target area in the Feng mode and the Feng mode to respectively obtain a power flow calculation result in the Feng mode and a power flow calculation result in the Feng mode;
step S320: and respectively performing 'N-1' checking on the basis of the flow calculation result in the small-volume mode and the flow calculation result in the afternoon mode, determining the maximum flow in each power grid line between the target interval and other adjacent intervals in the small-volume mode and the afternoon mode, and further respectively determining a regional flow delivery section bayonet in the small-volume mode and a regional flow delivery section bayonet in the afternoon mode.
5. The method of claim 4, wherein step S400 comprises:
step S410: according to the new energy installation basic scheme of each subarea in the planning year and the maximum power flow measurement and calculation in each power grid line of the target interval and other adjacent intervals in the small and rich mode, the wind power installation bearing capacity of the target area under the condition of meeting the power flow limit of the regional power flow delivery section bayonet in the small and rich mode is obtained;
step S420: and obtaining the photovoltaic installation bearing capacity of the target region under the condition of meeting the tidal current limit of the regional tidal current delivery section bayonet under the Fengmu mode according to the wind power installation bearing capacity of the target region under the condition of the tidal current limit of the regional tidal current delivery section bayonet under the Fengmu mode, the new energy installation basic scheme of each subarea of the planning year and the maximum tidal current measurement and calculation in each power grid line of the target interval and other adjacent intervals under the Fengmu mode.
6. The method according to claim 5, wherein step S410 is specifically:
wherein, FNxFor wind power installation bearing capacity in the target area in small and large mode, GNxPhotovoltaic device in target area under small and rich modeMechanical bearing capacity, CLxIs the current limit of a region current outward-sending section bayonet under a preset small and large mode, S1For the power-electricity balance result of the target area in the small and large mode, FNThe method is used for planning the wind power total installation scale of the whole annual area.
7. The method according to claim 5, wherein step S420 specifically comprises:
wherein, FNwFor the wind power installation bearing capacity in the target area in the Feng-noon mode, FNxFor wind power installation bearing capacity in the target area in small and large mode, GNwFor the bearing capacity of the photovoltaic installation in the target area in the Feng-noon mode, CLwIs the preset tidal current limit of the regional tidal current outward-sending section bayonet in the Feng 'ang' S mode2For the power and electric quantity balance result of the target area in Feng noon mode, GNThe method is used for planning the photovoltaic total installation scale of the whole annual area.
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