CN117473686B - Method for calculating bearing capacity of regional new energy under multi-section multi-level constraint - Google Patents
Method for calculating bearing capacity of regional new energy under multi-section multi-level constraint Download PDFInfo
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Abstract
The invention discloses a method for calculating the bearing capacity of new energy in a region under multi-section multi-level constraint, which takes grid constraint into consideration, takes new energy layout and range as constraint conditions, and sequentially starts to perform new energy scale layout from a first level power grid, a second level power grid and a third level power grid to obtain the total new energy scale of the third level power grid; the grid constraint is not considered, only the electric power and electric quantity balance relation is considered, and the new energy source rejection rate and the output coefficient are taken as constraint conditions to obtain the total new energy source scale of the third-level grid; and comprehensively considering the calculation results under the grid constraint and without considering the grid constraint to obtain the new energy bearing capacity of the third-level power grid. And a reasonable new energy scale layout is obtained through cyclic calculation, so that technical support and theoretical basis are provided for reasonably calculating new energy absorption space which can be borne in a regional power grid of a prospective annual planning region, and meanwhile, a guiding effect is also provided for actual engineering of new energy.
Description
Technical Field
The invention belongs to the technical field of power systems, and particularly relates to a method for calculating the bearing capacity of new energy in a region under multi-section multi-level constraint.
Background
The installed capacity of new energy is increased rapidly, and the phenomena of wind and light abandoning are serious. In order to quantitatively analyze the influence degree of multiple types of influence factors on new energy consumption blocking, the existing research analyzes the new energy consumption blocking factors from the aspects of sources, networks, charges, market mechanisms and the like, a new energy consumption influence factor contribution degree model based on time sequence production simulation is established, but the prior art belongs to the consideration of system operation, the invention guides the development of new energy in view of planning aiming at adapting to the future power grid development situation, has more practical significance, and researches the planning, operation and transaction mechanism of an electric power system for new energy consumption; based on the method, a method for calculating the bearing capacity of the new energy in the area under multi-section multi-level constraint is provided.
Disclosure of Invention
Aiming at the technical problems, the invention provides a method for calculating the bearing capacity of new energy in a region under multi-section multi-level constraint.
The technical scheme adopted for solving the technical problems is as follows:
a method for calculating the bearing capacity of new energy in a region under multi-section multi-level constraint comprises the following steps:
s100: taking grid constraints into consideration, taking new energy layout and range as constraint conditions, and carrying out first-level power grid bearing capacity analysis under the constraint of 'N-1' and different capacities of main transformers in the first-level power grid according to the line of the first-level section of the highest voltage level of the first-level power grid to the outside so as to obtain the new energy scale of the first-level power grid;
s200: based on the new energy scale of the first-level power grid, carrying out second-level power grid bearing capacity analysis according to the condition that the lines of the first and second sections of the second-level power grid meet the constraint of N-1, updating the new energy scale of the first-level power grid according to the bearing capacity analysis result of the second-level power grid, and obtaining the new energy scale of the second-level power grid according to the updated new energy scale of the first-level power grid;
s300: based on the new energy scale of the second-level power grid, carrying out third-level power grid bearing capacity analysis according to the check condition that the lines of the first and second sections outside the third-level power grid meet N-1, updating the updated new energy scale again according to the third-level power grid bearing capacity analysis result, obtaining the updated new energy scale of the second-level power grid according to the updated new energy scale, and obtaining the new energy scale of the third-level power grid according to the updated new energy scale of the second-level power grid;
s400: based on the updated new energy scale of the first-level power grid, the updated new energy scale of the second-level power grid and the new energy scale and layout of the third-level power grid, taking the power rejection rate of the new energy of the third-level power grid into consideration to be within a preset percentage, carrying out grid trend analysis of the third-level power grid to obtain a result meeting preset requirements, and taking the result as the total energy scale of the third-level power grid under the constraint of the grid, wherein the preset requirements are that all lines and main transformers meet the constraint of 'N-1';
s500: the grid constraint is not considered, only the electric power and electric quantity balance relation is considered, and the new energy rejection rate and the output coefficient are taken as constraint conditions, so that the total new energy scale of the third-level power grid is obtained without the grid constraint;
s600: and selecting the smaller total scale of the new energy of the third-level power grid, which is under the consideration of the grid constraint and the non-consideration of the grid constraint, as a final result, namely the new energy bearing capacity of the third-level power grid.
Preferably, S100 is specifically:
s110: constructing a power system grid frame through PSD-BPA simulation calculation software, carrying out initial power flow analysis on the first-level grid frame, and calculating a power flow result of each line under the constraint of 'N-1';
s120: according to the trend result of each line under the constraint of 'N-1', taking the limit transmission capacity of the line corresponding to the wire type of the line as the constraint, if the trend result of the line under the constraint of 'N-1' is more than or equal to 80% of the limit transmission capacity of the line, determining the line as a key line under a first-stage section of the grid which restricts new energy consumption;
s130: adjusting wind power output and photovoltaic output to enable the tide of a key line under a first-stage section to reach the limit conveying capacity of the key line, wherein the new energy scale adjusted at the moment corresponds to the first-level power grid bearing capacity under the first-stage section;
s140: judging a key line of a second-stage section under the condition that the first-stage power grid bearing capacity obtained by the line constraint of the first-stage section is met, and adjusting wind power and photovoltaic output to enable the power flow of the key line of the second-stage section to reach the limit conveying capacity of the key line, wherein the new energy scale adjusted at the moment is the first-stage power grid bearing capacity comprehensively considering the first-stage section and the second-stage section constraint; the first-stage section refers to a line connected with the analyzed main transformer; the second-stage section refers to a line of which the first-stage section extends outwards for one stage;
s150: the wind power output and the photovoltaic output are regulated, so that each main transformer capacity in the first-level power grid meets three conditions of 'N-1', 'N-1' overload by 30% and normal full load, newly added wind power and photovoltaic scale are new energy bearing capacity of the main transformer, and the smallest of the three results is taken as the new energy bearing capacity of the main transformer;
s160: and after adding the new energy bearing capacity of each main transformer in the first-level power grid, comparing the new energy bearing capacity with the bearing capacity of the first-level power grid constrained by the first-level section and the second-level section, wherein the minimum value of the new energy bearing capacity and the first-level power grid constrained by the first-level section and the second-level section is the total scale of the maximum bearing capacity of the finally obtained first-level power grid.
Preferably, S200 includes:
s210: based on the scale and layout of new energy sources of the first-level power grid, carrying out power flow analysis of the second-level power grid rack, and calculating a power flow result of each line in the second-level power grid rack under the constraint of 'N-1';
s220: according to the trend result of each line under the constraint of 'N-1', taking the limit transmission capacity of the line corresponding to the wire type of the line as the constraint, if the trend result of the line under the constraint of 'N-1' is more than or equal to 80% of the limit transmission capacity of the line, determining the line as a first section and a second section which restrict new energy consumption in the net rack;
s230: judging whether the line of the first-stage section of the second-level power grid meets the constraint of N-1, and if so, entering S240; if not, adjusting the new energy scale and layout of the first-level power grid until the line of the first-level section outside the second-level power grid meets the constraint of 'N-1', and then entering S240;
s240: judging whether the line of the second-level section of the second-level power grid meets the constraint of N-1 under the condition that the line of the first-level section of the second-level power grid meets the constraint of N-1, and if so, obtaining the new energy scale layout and bearing capacity of the current first-level power grid and the second-level power grid; and if the new energy source scale and the new energy source layout of the first-level power grid are not met, adjusting the new energy source scale and the new energy source layout of the first-level power grid until the line of the second-level section outside the second-level power grid meets the 'N-1' constraint, and outputting updated new energy source scale layout and bearing capacity of the first-level power grid and the second-level power grid.
Preferably, S300 is specifically:
s310: based on the updated new energy scales and layouts of the first-level power grid and the second-level power grid, carrying out third-level power grid rack power flow analysis, and calculating a power flow result of each line in the third-level power grid rack under the constraint of 'N-1';
s320: according to the trend result of each line under the constraint of 'N-1', taking the limit transmission capacity of the line corresponding to the wire type of the line as the constraint, if the trend result of the line under the constraint of 'N-1' is more than or equal to 80% of the limit transmission capacity of the line, determining the line as a first section and a second section which restrict new energy consumption in the net rack;
s330: judging whether the line of the first-stage section outside the third-stage power grid pair meets the constraint of N-1, and if so, entering S340; if not, adjusting the new energy scale and layout of the first-level power grid until the line of the first-level section outside the third-level power grid meets the constraint of 'N-1', and then entering S340;
s340: judging whether the line of the first-stage section outside the third-stage power grid meets the constraint of 'N-1', if so, obtaining the current new energy scale layout and bearing capacity of the first-stage power grid, the second-stage power grid and the third-stage power grid; and if the new energy source scale and the new energy source layout of the first-level power grid are not met, adjusting the new energy source scale and the new energy source layout of the first-level power grid until the line of the second-level section outside the third-level power grid meets the 'N-1' constraint, and outputting the updated new energy source scale layout and the updated new energy source bearing capacity of the first-level power grid, the updated new energy source layout of the second-level power grid and the updated new energy source layout of the third-level power grid are obtained.
Preferably, the new energy power rejection rate of the third-level power grid in S400 is within a preset percentage, and the preset percentage is 5%.
Preferably, S500 includes:
s510: acquiring the load, power supply and grid frame parameters of each station in the power system, and acquiring a key line for restricting the new energy consumption in the grid frame by taking the new energy electricity rejection rate and the output coefficient as constraint conditions in combination with the electric power and electric quantity balance relation;
s520: the key line set in the grid frame is obtained through load flow calculation simulation, the line and the main transformer in the whole province can meet the preset requirement through the adjustment of new energy output, at the moment, the corresponding new energy scale is the total new energy scale in the whole province, and the preset requirement is that all the lines and the main transformer meet the 'N-1' constraint.
Preferably, the electric power/electric quantity balance relationship in S500 is specifically:
；
in the method, in the process of the invention,the wind power output at the moment i is represented; />The photovoltaic output at the moment i is represented; />The water installation capacity at the moment i is represented; />The thermal power output at the moment i is represented; />Representing the energy storage installed capacity at the moment i; />Representing the load demand at time i;
new energy power rejection rateThe method comprises the following steps:
；
in the method, in the process of the invention,indicating the new energy waste amount, < >>、/>Respectively representing wind power and photovoltaic power rejection at a certain moment, < ->Representing a unit period->Representing the total power generation amount of new energy; wherein, the new energy waste amount is +.>The method comprises the following steps:
；
wind power output coefficientAnd photovoltaic output coefficient->The method comprises the following steps:
；
according to the characteristics of wind resources, under a small mode in a water-rich period, the new energy source only has wind power output, and at the moment, the wind power output coefficient is 0.7; in the noon mode, the wind power output coefficient is 0.4 at the moment; according to the characteristics of solar energy resources, photovoltaic output is carried out in a noon mode in a water-enlarging period, the photovoltaic output coefficient is 0.7, and at the moment, the photovoltaic output coefficient is 0;
the key circuit judging model in the grid rack is specifically as follows:
；
in the method, in the process of the invention,representing a key line set in a line k at the time t; />Indicating that the interval j in the line k at the time t becomes a key line set; />The section conveying tide of the section j in the line k at the moment t is shown; />The limit power transmission capacity of a section j in a line k at the moment t is represented; />A power flow critical value of the interval critical line is represented; />Representing a set of lines k.
Preferably, the total new energy scale of the third-level power grid in S520 includes a total wind power scale and a total photovoltaic scale, specifically:
total wind power scale:；
total photovoltaic scale:。
according to the method for calculating the bearing capacity of the regional new energy under the multi-section multi-level constraint, the new energy layout and the scale of the first-level power grid, the second-level power grid and the third-level power grid are calculated, and the reasonable new energy scale layout is obtained through cyclic calculation. Technical support and theoretical basis are provided for reasonably calculating new energy absorption space which can be borne in the prospective annual planning hierarchical power grid, and meanwhile, the method plays a guiding role for new energy actual engineering.
Drawings
FIG. 1 is a flowchart of a method for calculating a new energy bearing capacity of a region under multi-section multi-level constraint according to an embodiment of the present invention.
Detailed Description
In order to make the technical scheme of the present invention better understood by those skilled in the art, the present invention will be further described in detail with reference to the accompanying drawings.
In one embodiment, as shown in fig. 1, a method for calculating a new energy bearing capacity of a region under multi-section and multi-level constraint, the method comprises the following steps:
s100: and taking the grid constraint, taking the new energy layout and the range as constraint conditions, and carrying out first-level grid bearing capacity analysis according to the 'N-1' constraint and the different capacity constraints of each main transformer in the first-level grid according to the line of the first-level section of the highest voltage level of the first-level grid to obtain the new energy scale of the first-level grid.
Specifically, the "N-1" constraint refers to that any element in the power system in the normal operation mode has no fault or is disconnected due to fault, the power system should keep stable operation and normal power supply, and other elements are not overloaded, and the voltage and frequency are all within the allowable range.
In one embodiment, S100 is specifically:
s110: constructing a power system grid frame through PSD-BPA simulation calculation software, carrying out initial power flow analysis on the first-level grid frame, and calculating a power flow result of each line under the constraint of 'N-1';
s120: according to the trend result of each line under the constraint of 'N-1', taking the limit transmission capacity of the line corresponding to the wire type of the line as the constraint, if the trend result of the line under the constraint of 'N-1' is more than or equal to 80% of the limit transmission capacity of the line, determining the line as a key line under a first-stage section of the grid which restricts new energy consumption;
s130: adjusting wind power output and photovoltaic output to enable the tide of a key line under a first-stage section to reach the limit conveying capacity of the key line, wherein the new energy scale adjusted at the moment corresponds to the first-level power grid bearing capacity under the first-stage section;
s140: judging a key line of a second-stage section under the condition that the first-stage power grid bearing capacity obtained by the line constraint of the first-stage section is met, and adjusting wind power and photovoltaic output to enable the power flow of the key line of the second-stage section to reach the limit conveying capacity of the key line, wherein the new energy scale adjusted at the moment is the first-stage power grid bearing capacity comprehensively considering the first-stage section and the second-stage section constraint; the first-stage section refers to a line connected with the analyzed main transformer; the second-stage section refers to a line of which the first-stage section extends outwards for one stage;
s150: the wind power output and the photovoltaic output are regulated, so that each main transformer capacity in the first-level power grid meets three conditions of 'N-1', 'N-1' overload by 30% and normal full load, newly added wind power and photovoltaic scale are new energy bearing capacity of the main transformer, and the smallest of the three results is taken as the new energy bearing capacity of the main transformer;
s160: and after adding the new energy bearing capacity of each main transformer in the first-level power grid, comparing the new energy bearing capacity with the bearing capacity of the first-level power grid constrained by the first-level section and the second-level section, wherein the minimum value of the new energy bearing capacity and the first-level power grid constrained by the first-level section and the second-level section is the total scale of the maximum bearing capacity of the finally obtained first-level power grid.
Specifically, for example, when a transformer station has 2 main transformers with a capacity of 180MVA, N-1 represents that 1 main transformer of the 2 main transformers is failed, only the capacity of 1 main transformer is left to be the bearing capacity (180) of the main transformer, N-1 overload 30% represents that 1 main transformer of the 2 main transformers is failed, only 1.3 times the capacity of 1 main transformer is left to be the bearing capacity (180×1.3=234) of the main transformer, and normal full load represents that 2 main transformers are normally operated (2×180=360).
S200: and based on the new energy scale of the first-level power grid, carrying out second-level power grid bearing capacity analysis according to the condition that the lines of the first and second sections of the second-level power grid meet the constraint of N-1, updating the new energy scale of the first-level power grid according to the bearing capacity analysis result of the second-level power grid, and obtaining the new energy scale of the second-level power grid according to the updated new energy scale of the first-level power grid.
In one embodiment, S200 includes:
s210: based on the scale and layout of new energy sources of the first-level power grid, carrying out power flow analysis of the second-level power grid rack, and calculating a power flow result of each line in the second-level power grid rack under the constraint of 'N-1';
s220: according to the trend result of each line under the constraint of 'N-1', taking the limit transmission capacity of the line corresponding to the wire type of the line as the constraint, if the trend result of the line under the constraint of 'N-1' is more than or equal to 80% of the limit transmission capacity of the line, determining the line as a first section and a second section which restrict new energy consumption in the net rack;
s230: judging whether the line of the first-stage section of the second-level power grid meets the constraint of N-1, and if so, entering S240; if not, adjusting the new energy scale and layout of the first-level power grid until the line of the first-level section outside the second-level power grid meets the constraint of 'N-1', and then entering S240;
s240: judging whether the line of the second-level section of the second-level power grid meets the constraint of N-1 under the condition that the line of the first-level section of the second-level power grid meets the constraint of N-1, and if so, obtaining the new energy scale layout and bearing capacity of the current first-level power grid and the second-level power grid; and if the new energy source scale and the new energy source layout of the first-level power grid are not met, adjusting the new energy source scale and the new energy source layout of the first-level power grid until the line of the second-level section outside the second-level power grid meets the 'N-1' constraint, and outputting updated new energy source scale layout and bearing capacity of the first-level power grid and the second-level power grid.
S300: and based on the new energy scale of the second-level power grid, carrying out third-level power grid bearing capacity analysis according to the check condition that the lines of the first and second sections outside the third-level power grid meet N-1, updating the updated new energy scale again according to the third-level power grid bearing capacity analysis result, obtaining the updated new energy scale of the second-level power grid according to the updated new energy scale, and obtaining the new energy scale of the third-level power grid according to the updated new energy scale of the second-level power grid.
In one embodiment, S300 is specifically:
s310: based on the updated new energy scales and layouts of the first-level power grid and the second-level power grid, carrying out third-level power grid rack power flow analysis, and calculating a power flow result of each line in the third-level power grid rack under the constraint of 'N-1';
s320: according to the trend result of each line under the constraint of 'N-1', taking the limit transmission capacity of the line corresponding to the wire type of the line as the constraint, if the trend result of the line under the constraint of 'N-1' is more than or equal to 80% of the limit transmission capacity of the line, determining the line as a first section and a second section which restrict new energy consumption in the net rack;
s330: judging whether the line of the first-stage section outside the third-stage power grid pair meets the constraint of N-1, and if so, entering S340; if not, adjusting the new energy scale and layout of the first-level power grid until the line of the first-level section outside the third-level power grid meets the constraint of 'N-1', and then entering S340;
s340: judging whether the line of the first-stage section outside the third-stage power grid meets the constraint of 'N-1', if so, obtaining the current new energy scale layout and bearing capacity of the first-stage power grid, the second-stage power grid and the third-stage power grid; and if the new energy source scale and the new energy source layout of the first-level power grid are not met, adjusting the new energy source scale and the new energy source layout of the first-level power grid until the line of the second-level section outside the third-level power grid meets the 'N-1' constraint, and outputting the updated new energy source scale layout and the updated new energy source bearing capacity of the first-level power grid, the updated new energy source layout of the second-level power grid and the updated new energy source layout of the third-level power grid are obtained.
S400: and based on the updated new energy scale of the first-level power grid, the updated new energy scale of the second-level power grid and the new energy scale and layout of the third-level power grid, taking the power rejection rate of the new energy of the third-level power grid into consideration to be within a preset percentage, carrying out grid trend analysis of the third-level power grid to obtain a result meeting preset requirements, and taking the result as the total energy scale of the third-level power grid under the constraint of the grid into consideration, wherein the preset requirements are that all lines and main transformers meet the constraint of N-1.
Further, the first, second and third levels of the present invention are for grids, all of which can be used in a generic way to calculate new energy scale load capacity, wherein the third level of the grid comprises a plurality of second level grids comprising a plurality of first level grids.
In one embodiment, the new energy power rejection rate of the third-level power grid in S400 is within a preset percentage, and the preset percentage is 5%.
S500: and the grid constraint is not considered, only the electric power and electric quantity balance relation is considered, and the new energy source rejection rate and the output coefficient are taken as constraint conditions, so that the total new energy source scale of the third-level power grid is obtained without the grid constraint.
In one embodiment, S500 includes:
s510: acquiring the load, power supply and grid frame parameters of each station in the power system, and acquiring a key line for restricting the new energy consumption in the grid frame by taking the new energy electricity rejection rate and the output coefficient as constraint conditions in combination with the electric power and electric quantity balance relation;
s520: the key line set in the grid frame is obtained through load flow calculation simulation, the line and the main transformer in the whole province can meet the preset requirement through the adjustment of new energy output, at the moment, the corresponding new energy scale is the total new energy scale in the whole province, and the preset requirement is that all the lines and the main transformer meet the 'N-1' constraint.
Specifically, if the line is overloaded, the new energy output scale is adjusted to be reduced, and if the line is not overloaded, the new energy output scale is increased.
In one embodiment, the power-to-charge balance relationship in S500 is specifically:
；
in the method, in the process of the invention,the wind power output at the moment i is represented; />The photovoltaic output at the moment i is represented; />The water installation capacity at the moment i is represented; />The thermal power output at the moment i is represented; />Representing the energy storage installed capacity at the moment i; />Representing the load demand at time i;
new energy power rejection rateThe method comprises the following steps:
；
in the method, in the process of the invention,indicating the new energy waste amount, < >>、/>Respectively representing wind power and photovoltaic power rejection at a certain moment, < ->Representing a unit period->Representing the total power generation amount of new energy; wherein, the new energy waste amount is +.>The method comprises the following steps:
；
wind power output coefficientAnd photovoltaic output coefficient->The method comprises the following steps:
；
according to the characteristics of wind resources, under a small mode in a water-rich period, the new energy source only has wind power output, and at the moment, the wind power output coefficient is 0.7; in the noon mode, the wind power output coefficient is 0.4 at the moment; according to the characteristics of solar energy resources, photovoltaic output is carried out in a noon mode in a water-enlarging period, the photovoltaic output coefficient is 0.7, and at the moment, the photovoltaic output coefficient is 0;
the key circuit judging model in the grid rack is specifically as follows:
；
in the method, in the process of the invention,representing a key line set in a line k at the time t; />Indicating that the interval j in the line k at the time t becomes a key line set; />The section conveying tide of the section j in the line k at the moment t is shown; />The limit power transmission capacity of a section j in a line k at the moment t is represented; />A power flow critical value of the interval critical line is represented; />Representing a set of lines k.
Specifically, in this embodiment, the new energy electricity rejection rate is less than or equal to 5%; in addition, the small mode in the water-rich period refers to an operation mode corresponding to the small load moment in the early morning, and the noon mode in the water-rich period refers to an operation mode corresponding to the load moment in the midday.
In one embodiment, the total amount of new energy scale of the third-level power grid in S520 includes a total wind power scale and a total photovoltaic scale, specifically:
total wind power scale:；
total photovoltaic scale:。
s600: and selecting the smaller total scale of the new energy of the third-level power grid, which is under the consideration of the grid constraint and the non-consideration of the grid constraint, as a final result, namely the new energy bearing capacity of the third-level power grid.
Specifically, the grid constraint is not considered, only the electric power and electric quantity balance relation is considered, and the new energy source rejection rate and the output coefficient are taken as constraint conditions, so that the total new energy source scale of the third-level power grid is obtained without the grid constraint; and taking the grid constraint as a constraint condition and taking the new energy layout and the range as constraint conditions, and calculating to obtain the total new energy scale of the third-level power grid under the grid constraint. And comparing the two, wherein the smaller value is taken as a final result, namely the new energy bearing capacity of the third-level power grid.
The invention provides an effect of a new energy consumption and power rejection rate calculation method under multi-section multi-level constraint consideration. Taking a regional power grid as an example, specific data are analyzed as follows:
and selecting the most serious form for checking and calculating the new energy consumption scale carried by a certain area. The area is only provided with 1 220kV transformer substation, and the primary section is three 220kV lines.
1. 220kV level bearing capacity. When the three-circuit 220kV line is considered to meet the requirement of N-1, the result of the new energy scale is 371MW, and when the external line is considered to meet the requirement of N-1, the first-level power grid can bear the new energy consumption scale, as shown in Table 1.
Table 1 220kv level can carry new energy consumption scale units: MW (MW)
2. 110kV level bearing capacity. Considering that the main transformer capacity of the A transformer station is checked according to the conditions of meeting the conditions of 'N-1', 'N-1' overload of 30% and normal full load, the new energy source scale is configured to be 85MW (fully met) and 175MW (overload capacity met) at the 110kV level by combining the 220kV level bearing capacity, as shown in table 2.
Table 2 can carry new energy consumption scale units under main transformer constraint: MW (MW)
Combining the analysis, the new energy source scale can be configured to be 371MW from the whole bearing capacity of the area; from the single main transformer capacity bearing capacity, the configurable new energy scale is 85MW (fully satisfied), 175MW (overload capacity satisfied). Therefore, the absorption requirement can be met within the overload capacity range of the main transformer 'N-1' of the A transformer station.
The new energy layout and the scale of the first-level power grid, the second-level power grid and the third-level power grid are calculated through the method for calculating the bearing capacity of the regional new energy under the multi-section multi-level constraint, and the reasonable new energy scale layout is obtained through cyclic calculation. Technical support and theoretical basis are provided for reasonably calculating new energy absorption space which can be borne in the prospective annual planning hierarchical power grid, and meanwhile, the method plays a guiding role for new energy actual engineering.
The method for calculating the bearing capacity of the new regional energy under the multi-section multi-level constraint provided by the invention is described in detail. The principles and embodiments of the present invention have been described herein with reference to specific examples, the description of which is intended only to facilitate an understanding of the core concepts of the invention. It should be noted that it will be apparent to those skilled in the art that various modifications and adaptations of the invention can be made without departing from the principles of the invention and these modifications and adaptations are intended to be within the scope of the invention as defined in the following claims.
Claims (6)
1. The method for calculating the bearing capacity of the new energy in the area under the multi-section multi-level constraint is characterized by comprising the following steps:
s100: taking grid constraints into consideration, taking new energy layout and range as constraint conditions, and carrying out first-level power grid bearing capacity analysis under the constraint of 'N-1' and different capacities of main transformers in the first-level power grid according to the line of the first-level section of the highest voltage level of the first-level power grid to the outside so as to obtain the new energy scale of the first-level power grid;
s200: based on the new energy scale of the first-level power grid, carrying out second-level power grid bearing capacity analysis according to the condition that the lines of the first and second sections of the second-level power grid meet the constraint of N-1, updating the new energy scale of the first-level power grid according to the bearing capacity analysis result of the second-level power grid, and obtaining the new energy scale of the second-level power grid according to the updated new energy scale of the first-level power grid;
s300: based on the new energy scale of the second-level power grid, carrying out third-level power grid bearing capacity analysis according to the check condition that the lines of the first and second sections outside the third-level power grid meet N-1, updating the updated new energy scale again according to the third-level power grid bearing capacity analysis result, obtaining the updated new energy scale of the second-level power grid according to the updated new energy scale, and obtaining the new energy scale of the third-level power grid according to the updated new energy scale of the second-level power grid;
s400: based on the updated new energy scale of the first-level power grid, the updated new energy scale of the second-level power grid and the new energy scale and layout of the third-level power grid, taking the power rejection rate of the new energy of the third-level power grid into consideration to be within a preset percentage, carrying out grid trend analysis of the third-level power grid to obtain a result meeting preset requirements, and taking the result as the total energy scale of the third-level power grid under the constraint of the grid, wherein the preset requirements are that all lines and main transformers meet the constraint of 'N-1'; the constraint of N-1 means that any element in the power system in a normal operation mode has no fault or is disconnected due to fault, the power system can keep stable operation and normal power supply, other elements are not overloaded, and the voltage and the frequency are all in an allowable range;
s500: the grid constraint is not considered, only the electric power and electric quantity balance relation is considered, and the new energy rejection rate and the output coefficient are taken as constraint conditions, so that the total new energy scale of the third-level power grid is obtained without the grid constraint;
s600: selecting a smaller total scale of the new energy of the third-level power grid, which is considered with the grid constraint and is not considered with the grid constraint, as a final result, namely the new energy bearing capacity of the third-level power grid;
s500 includes:
s510: acquiring the load, power supply and grid frame parameters of each station in the power system, and acquiring a key line for restricting the new energy consumption in the grid frame by taking the new energy electricity rejection rate and the output coefficient as constraint conditions in combination with the electric power and electric quantity balance relation;
s520: obtaining a key circuit set in the grid frame through load flow calculation simulation, and adjusting the output of the new energy to enable the circuits and the main transformers in the whole province to meet the preset requirement, wherein the corresponding new energy scale is the total new energy scale in the whole province, and the preset requirement is that all the circuits and the main transformers meet the constraint of N-1;
the electric power and electric quantity balance relation in S500 is specifically:
；
in the method, in the process of the invention,the wind power output at the moment i is represented; />The photovoltaic output at the moment i is represented; />The water installation capacity at the moment i is represented; />The thermal power output at the moment i is represented; />Representing the energy storage installed capacity at the moment i; />Representing the load demand at time i;
new energy power rejection rateThe method comprises the following steps:
；
in the method, in the process of the invention,indicating the new energy waste amount, < >>、/>Respectively representing wind power and photovoltaic power rejection at a certain moment, < ->Representing a unit period->Representing the total power generation amount of new energy; wherein, the new energy waste amount is +.>The method comprises the following steps:
；
wind power output coefficientAnd photovoltaic output coefficient->The method comprises the following steps:
；
according to the characteristics of wind resources, under a small mode in a water-rich period, the new energy source only has wind power output, and at the moment, the wind power output coefficient is 0.7; in the noon mode, the wind power output coefficient is 0.4 at the moment; according to the characteristics of solar energy resources, photovoltaic output is carried out in a noon mode in a water-enlarging period, the photovoltaic output coefficient is 0.7, and at the moment, the photovoltaic output coefficient is 0;
the key circuit judging model in the grid rack is specifically as follows:
；
in the method, in the process of the invention,representing a key line set in a line k at the time t; />Indicating that the interval j in the line k at the time t becomes a key line set; />The section conveying tide of the section j in the line k at the moment t is shown; />The limit power transmission capacity of a section j in a line k at the moment t is represented; />A power flow critical value of the interval critical line is represented; />Representing a set of lines k.
2. The method according to claim 1, wherein S100 is specifically:
s110: constructing a power system grid frame through PSD-BPA simulation calculation software, carrying out initial power flow analysis on the first-level grid frame, and calculating a power flow result of each line under the constraint of 'N-1';
s120: according to the trend result of each line under the constraint of 'N-1', taking the limit transmission capacity of the line corresponding to the wire type of the line as the constraint, if the trend result of the line under the constraint of 'N-1' is more than or equal to 80% of the limit transmission capacity of the line, determining the line as a key line under a first-stage section of the grid which restricts new energy consumption;
s130: adjusting wind power output and photovoltaic output to enable the tide of a key line under a first-stage section to reach the limit conveying capacity of the key line, wherein the new energy scale adjusted at the moment corresponds to the first-level power grid bearing capacity under the first-stage section;
s140: judging a key line of a second-stage section under the condition that the first-stage power grid bearing capacity obtained by the line constraint of the first-stage section is met, and adjusting wind power and photovoltaic output to enable the power flow of the key line of the second-stage section to reach the limit conveying capacity of the key line, wherein the new energy scale adjusted at the moment is the first-stage power grid bearing capacity comprehensively considering the first-stage section and the second-stage section constraint; the first-stage section refers to a line connected with the analyzed main transformer; the second-stage section refers to a line of which the first-stage section extends outwards for one stage;
s150: the wind power output and the photovoltaic output are regulated, so that each main transformer capacity in the first-level power grid meets three conditions of 'N-1', 'N-1' overload by 30% and normal full load, newly added wind power and photovoltaic scale are new energy bearing capacity of the main transformer, and the smallest of the three results is taken as the new energy bearing capacity of the main transformer;
s160: and after adding the new energy bearing capacity of each main transformer in the first-level power grid, comparing the new energy bearing capacity with the bearing capacity of the first-level power grid constrained by the first-level section and the second-level section, wherein the minimum value of the new energy bearing capacity and the first-level power grid constrained by the first-level section and the second-level section is the total scale of the maximum bearing capacity of the finally obtained first-level power grid.
3. The method of claim 2, wherein S200 comprises:
s210: based on the scale and layout of new energy sources of the first-level power grid, carrying out power flow analysis of the second-level power grid rack, and calculating a power flow result of each line in the second-level power grid rack under the constraint of 'N-1';
s220: according to the trend result of each line under the constraint of 'N-1', taking the limit transmission capacity of the line corresponding to the wire type of the line as the constraint, if the trend result of the line under the constraint of 'N-1' is more than or equal to 80% of the limit transmission capacity of the line, determining the line as a first section and a second section which restrict new energy consumption in the net rack;
s230: judging whether the line of the first-stage section of the second-level power grid meets the constraint of N-1, and if so, entering S240; if not, adjusting the new energy scale and layout of the first-level power grid until the line of the first-level section outside the second-level power grid meets the constraint of 'N-1', and then entering S240;
s240: judging whether the line of the second-level section of the second-level power grid meets the constraint of N-1 under the condition that the line of the first-level section of the second-level power grid meets the constraint of N-1, and if so, obtaining the new energy scale layout and bearing capacity of the current first-level power grid and the second-level power grid; and if the new energy source scale and the new energy source layout of the first-level power grid are not met, adjusting the new energy source scale and the new energy source layout of the first-level power grid until the line of the second-level section outside the second-level power grid meets the 'N-1' constraint, and outputting updated new energy source scale layout and bearing capacity of the first-level power grid and the second-level power grid.
4. A method according to claim 3, wherein S300 is specifically:
s310: based on the updated new energy scales and layouts of the first-level power grid and the second-level power grid, carrying out third-level power grid rack power flow analysis, and calculating a power flow result of each line in the third-level power grid rack under the constraint of 'N-1';
s320: according to the trend result of each line under the constraint of 'N-1', taking the limit transmission capacity of the line corresponding to the wire type of the line as the constraint, if the trend result of the line under the constraint of 'N-1' is more than or equal to 80% of the limit transmission capacity of the line, determining the line as a first section and a second section which restrict new energy consumption in the net rack;
s330: judging whether the line of the first-stage section outside the third-stage power grid pair meets the constraint of N-1, and if so, entering S340; if not, adjusting the new energy scale and layout of the first-level power grid until the line of the first-level section outside the third-level power grid meets the constraint of 'N-1', and then entering S340;
s340: judging whether the line of the first-stage section outside the third-stage power grid meets the constraint of 'N-1', if so, obtaining the current new energy scale layout and bearing capacity of the first-stage power grid, the second-stage power grid and the third-stage power grid; and if the new energy source scale and the new energy source layout of the first-level power grid are not met, adjusting the new energy source scale and the new energy source layout of the first-level power grid until the line of the second-level section outside the third-level power grid meets the 'N-1' constraint, and outputting the updated new energy source scale layout and the updated new energy source bearing capacity of the first-level power grid, the updated new energy source layout of the second-level power grid and the updated new energy source layout of the third-level power grid are obtained.
5. The method of claim 1, wherein the third-level grid new energy rejection rate in S400 is within a preset percentage of 5%.
6. The method according to claim 1, wherein the total amount of new energy scale of the third level grid in S520 includes a total wind power scale and a total photovoltaic scale, specifically:
total wind power scale:；
total photovoltaic scale:。
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