CN115940244A - Centralized photovoltaic access capacity determination method and system considering short circuit capacity constraint - Google Patents
Centralized photovoltaic access capacity determination method and system considering short circuit capacity constraint Download PDFInfo
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Abstract
The invention discloses a centralized photovoltaic access capacity determination method and a system considering short circuit capacity constraint, which comprises the following steps: step 1, building a first simulation model of each photovoltaic power station and a grid-connected system based on a planning scheme; step 2, determining an original value of the maximum photovoltaic accessible capacity of a centralized grid-connected point under a planning scheme based on a current first simulation model; step 3, modifying each photovoltaic power station as an access mode of firstly connecting in series and then connecting in parallel to determine a photovoltaic grid-connected optimization scheme, and updating the current first model based on the photovoltaic grid-connected optimization scheme to build a second simulation model of each photovoltaic power station and a grid-connected system; step 4, determining a photovoltaic maximum accessible capacity optimization value of a centralized grid-connected point under a photovoltaic grid-connected optimization scheme based on a current second simulation model; and 5, determining photovoltaic access capacity according to the original value of the maximum photovoltaic accessible capacity and the optimized value of the maximum photovoltaic accessible capacity.
Description
Technical Field
The invention relates to the technical field of simulation analysis and calculation of a power system, in particular to a centralized photovoltaic access capacity determination method and system considering short-circuit capacity constraint.
Background
Photovoltaic is rapidly developed in the global scope as the most scaled power generation technology with renewable energy sources with commercial development prospect.
There are mainly 2 ways for photovoltaic access to the grid: decentralized access and centralized access. The distributed access is mainly used for the conditions that the photovoltaic development scale is small and local consumption is mainly used, the access voltage level is low, and the influence on the system operation is small. The centralized access is mainly used for the conditions of large photovoltaic development scale and remote consumption, and has high access voltage level, long transmission distance and great influence on the operation of a power grid.
Most developed countries in Europe adopt decentralized access to photovoltaic, the power grid structures of the countries tend to be stable, the load demand is increased slowly, and the main purposes of the countries for vigorously developing renewable energy sources such as photovoltaic and the like are to deal with climate warming and reduce carbon emission. Under the guidance of the photovoltaic development strategy of building a large base and integrating a large power grid in China, the photovoltaic in China is changed from small-scale decentralized access in the initial development stage to large-scale centralized access. The photovoltaic power stations show the trend of scale development, the installed capacity of a single photovoltaic power station is increased from thousands of kilowatts to hundreds of thousands of kilowatts, even millions of kilowatts, and each centralized photovoltaic power station is connected to a certain grid-connected point on the side of a power grid in a centralized mode through a single-circuit line.
The short-circuit current calculation is calculation and analysis work which is necessary to be carried out in the planning, design and operation of the power system. The exceeding of the short-circuit current may destroy the safety of the power grid and even cause the breakdown of the whole interconnected system. In recent years, with the scale expansion of interconnected power grids and the construction of extra-high voltage power grids, the problem of short-circuit capacity overrun and a coping strategy become key technical problems of operation control and reasonable planning of large power grids.
In the early stage, because the photovoltaic grid-connected scale is small and mainly developed in a dispersed form, the short-circuit current provided by the photovoltaic to the grid-connected point is generally considered to be far smaller than the self short-circuit current of the grid-connected point, and the short-circuit current provided by the photovoltaic power station to the power grid can be ignored, so that the photovoltaic research work mainly focuses on the directions of voltage, frequency, small interference stability and the like after the photovoltaic grid-connected, and the attention to the short-circuit current problem of the power system after the photovoltaic grid-connected is less. However, with the increase of the scale of the concentrated grid-connected photovoltaic, the influence of the photovoltaic on the short-circuit current of the concentrated grid-connected point is not negligible. Under the limiting factor of short circuit capacity, concentrating the maximum installed photovoltaic capacity that a grid-connected point can access has become an important concern for the current power planning and operation departments.
Disclosure of Invention
The invention provides a centralized photovoltaic access capability determining method and system considering short-circuit capacity constraint, and aims to solve the problem of how to determine photovoltaic access capability.
To solve the above problem, according to an aspect of the present invention, there is provided a centralized photovoltaic access capability determination method that takes into account short circuit capacity constraints, the method comprising:
step 1, building a first simulation model of each photovoltaic power station and a grid-connected system based on a planning scheme;
step 2, determining an original value of the maximum photovoltaic accessible capacity of a centralized grid-connected point under a planning scheme based on a current first simulation model;
step 3, modifying each photovoltaic power station as an access mode of firstly connecting in series and then connecting in parallel to determine a photovoltaic grid-connected optimization scheme, and updating the current first model based on the photovoltaic grid-connected optimization scheme to build a second simulation model of each photovoltaic power station and a grid-connected system;
step 4, determining a photovoltaic maximum accessible capacity optimization value of a centralized grid-connected point under a photovoltaic grid-connected optimization scheme based on a current second simulation model;
and 5, determining photovoltaic access capacity according to the original value of the maximum photovoltaic accessible capacity and the optimized value of the maximum photovoltaic accessible capacity.
Preferably, the determining, based on the first simulation model, a photovoltaic maximum accessible capacity raw value of a centralized grid-connected point under a planning scheme includes:
calculating short-circuit current based on the first simulation model, and determining a first short-circuit current level of each voltage grade bus at a centralized grid-connected point under a planning scheme;
determining a first short-circuit current margin value corresponding to each bus according to the first short-circuit current level and a preset switch interruption capacity upper limit corresponding to each bus;
and if the first short-circuit current margin values corresponding to the buses are smaller than the preset short-circuit current margin threshold value corresponding to the corresponding bus, determining the maximum photovoltaic accessible capacity original value of the centralized grid-connected point under the planning scheme according to the current photovoltaic grid-connected capacity value.
Preferably, wherein the method further comprises:
and if the first short-circuit current margin value corresponding to each bus is not satisfied and is smaller than the preset short-circuit current margin threshold value corresponding to the corresponding bus, updating the photovoltaic grid-connected capacity to be the sum of the preset step length threshold value and the current photovoltaic grid-connected capacity, updating the first simulation model according to the updated photovoltaic grid-connected capacity, and returning to the step 2 for recalculation.
Preferably, the determining and integrating the photovoltaic maximum accessible capacity optimization value of the grid-connected point under the photovoltaic grid-connected optimization scheme based on the current second simulation model includes:
calculating short-circuit current based on the second simulation model, and determining a second short-circuit current level of each voltage grade bus at the centralized grid-connected point under the optimization scheme;
determining a second short-circuit current margin value corresponding to each bus according to the second short-circuit current level and a preset switch interruption capacity upper limit corresponding to each bus;
and if the second short-circuit current margin values corresponding to the buses are smaller than the preset short-circuit current margin threshold value corresponding to the corresponding bus, determining the photovoltaic maximum accessible capacity optimization value of the centralized grid-connected point under the planning scheme according to the current photovoltaic grid-connected capacity value.
Preferably, wherein the method further comprises:
and if the second short-circuit current margin value corresponding to each bus is not met and is smaller than the preset short-circuit current margin threshold value corresponding to the corresponding bus, updating the photovoltaic grid-connected capacity to be the sum of the preset step length threshold value and the current photovoltaic grid-connected capacity, updating the second simulation model according to the updated photovoltaic grid-connected capacity, and returning to the step 4 for recalculation.
Preferably, the determining the photovoltaic access capability according to the original value of the photovoltaic maximum accessible capacity and the optimized value of the photovoltaic maximum accessible capacity includes:
if photovoltaic plan installed capacity Q Planning <Q max original If yes, determining to allow the access to the point of connection;
if photovoltaic plan installed capacity Q max original <Q Planning <Q max you Determining that the grid-connected point is allowed to be accessed and each photovoltaic power station needs to be connected in series and then connected in a grid;
if photovoltaic plan installed capacity Q Planning >Q max you Determining that the accessible range of the grid-connected point is exceeded; wherein Q is max original The maximum photovoltaic accessible capacity is an original value; q max you Optimizing the value for the maximum photovoltaic accessible capacity.
According to another aspect of the invention, there is provided a centralized photovoltaic access capability determination system that accounts for short circuit capacity constraints, the system comprising:
the first simulation model building unit is used for building first simulation models of the photovoltaic power stations and the grid-connected system based on a planning scheme;
the photovoltaic maximum accessible capacity original value determining unit is used for determining a photovoltaic maximum accessible capacity original value of a centralized grid-connected point under a planning scheme based on a current first simulation model;
the second simulation model building unit is used for modifying each photovoltaic power station into an access mode of firstly connecting in series and then connecting in parallel to determine a photovoltaic grid-connected optimization scheme, and updating the current first model based on the photovoltaic grid-connected optimization scheme to build a second simulation model of each photovoltaic power station and a grid-connected system;
the photovoltaic maximum accessible capacity optimization value determining unit is used for determining a photovoltaic maximum accessible capacity optimization value of a centralized grid-connected point under the photovoltaic grid-connected optimization scheme based on the current second simulation model;
and the photovoltaic access capacity determining unit is used for determining the photovoltaic access capacity according to the original value of the photovoltaic maximum accessible capacity and the optimized value of the photovoltaic maximum accessible capacity.
Preferably, the determining unit of the original value of the maximum photovoltaic accessible capacity of the centralized grid-connected point under the planning scheme based on the first simulation model comprises:
calculating short-circuit current based on the first simulation model, and determining a first short-circuit current level of each voltage grade bus at a centralized grid-connected point under a planning scheme;
determining a first short-circuit current margin value corresponding to each bus according to the first short-circuit current level and a preset switch interruption capacity upper limit corresponding to each bus;
and if the first short-circuit current margin values corresponding to the buses are smaller than the preset short-circuit current margin threshold value corresponding to the corresponding bus, determining the maximum photovoltaic accessible capacity original value of the centralized grid-connected point under the planning scheme according to the current photovoltaic grid-connected capacity value.
Preferably, the original value determining unit for maximum photovoltaic accessible capacity further includes:
if the first short-circuit current margin value corresponding to each bus is not met and is smaller than the preset short-circuit current margin threshold value corresponding to the corresponding bus, the photovoltaic grid-connected capacity is updated to be the sum of the preset step length threshold value and the current photovoltaic grid-connected capacity, the first simulation model is updated according to the updated photovoltaic grid-connected capacity, and recalculation is carried out.
Preferably, the determining unit of the maximum photovoltaic accessible capacity optimized value determines the maximum photovoltaic accessible capacity optimized value of a centralized grid-connected point under the grid-connected photovoltaic optimization scheme based on the current second simulation model, and includes:
calculating short-circuit current based on the second simulation model, and determining a second short-circuit current level of each voltage grade bus at the centralized grid-connected point under the optimization scheme;
determining a second short-circuit current margin value corresponding to each bus according to the second short-circuit current level and a preset switch interruption capacity upper limit corresponding to each bus;
and if the second short-circuit current margin values corresponding to the buses are smaller than the preset short-circuit current margin threshold value corresponding to the corresponding bus, determining the photovoltaic maximum accessible capacity optimization value of the centralized grid-connected point under the planning scheme according to the current photovoltaic grid-connected capacity value.
Preferably, the photovoltaic maximum accessible capacity optimization value determining unit further includes:
and if the second short-circuit current margin value corresponding to each bus is not met and is smaller than the preset short-circuit current margin threshold value corresponding to the corresponding bus, updating the photovoltaic grid-connected capacity to be the sum of the preset step length threshold value and the current photovoltaic grid-connected capacity, updating the second simulation model according to the updated photovoltaic grid-connected capacity, and recalculating.
Preferably, the determining unit of photovoltaic access capability determines the photovoltaic access capability according to the original value of the photovoltaic maximum accessible capacity and the optimized value of the photovoltaic maximum accessible capacity, and includes:
if photovoltaic plan installed capacity Q Planning <Q max original If yes, determining to allow access to the grid-connected point;
if photovoltaic plan installed capacity Q max original <Q Planning <Q max you If the grid-connected point is allowed to be accessed, all the photovoltaic power stations need to be connected in series and then connected in a grid;
if photovoltaic plan installed capacity Q Planning >Q max you Determining that the accessible range of the grid-connected point is exceeded; wherein Q max original The maximum photovoltaic accessible capacity is an original value; q max you Optimizing the value for the maximum photovoltaic accessible capacity.
The invention provides a centralized photovoltaic access capacity determination method and a system considering short circuit capacity constraint, which comprises the following steps: building a first simulation model of each photovoltaic power station and a grid-connected system based on a planning scheme; determining an original value of the maximum photovoltaic accessible capacity of a centralized grid-connected point under a planning scheme based on a current first simulation model; modifying each photovoltaic power station as an access mode of firstly connecting in series and then connecting in parallel to determine a photovoltaic grid-connected optimization scheme, and updating a current first model based on the photovoltaic grid-connected optimization scheme to build a second simulation model of each photovoltaic power station and a grid-connected system; determining a photovoltaic maximum accessible capacity optimization value of a centralized grid-connected point under a photovoltaic grid-connected optimization scheme based on a current second simulation model; and determining photovoltaic access capacity according to the original value of the maximum photovoltaic accessible capacity and the optimized value of the maximum photovoltaic accessible capacity. According to the method, short-circuit current calculation is carried out on the buses of each voltage class of the photovoltaic centralized grid-connected point, and the photovoltaic maximum accessible capacity of the centralized grid-connected point is determined according to the margin between the short-circuit current calculation index of each bus and the short-circuit capacity limit value, so that the problem that the short-circuit current of the grid-connected point exceeds the standard after large-scale photovoltaic centralized access is avoided; the method can be suitable for safety and stability evaluation of a large-scale power system, has good computability and wide adaptability, and can be used as a main analysis tool of a dispatching operation and planning and designing department.
Drawings
A more complete understanding of exemplary embodiments of the present invention may be had by reference to the following drawings in which:
fig. 1 is a flow diagram of a centralized photovoltaic access capability determination method 100 that accounts for short circuit capacity constraints, according to an embodiment of the present invention;
fig. 2 is a flow chart of a centralized photovoltaic access capability calculation method that accounts for short circuit capacity constraints, according to an embodiment of the present invention;
fig. 3 is a schematic block diagram of a centralized photovoltaic access capability determination system 300 that accounts for short circuit capacity constraints, according to an embodiment of the invention.
Detailed Description
The exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, however, the present invention may be embodied in many different forms and is not limited to the embodiments described herein, which are provided for complete and complete disclosure of the present invention and to fully convey the scope of the present invention to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the accompanying drawings is not intended to be limiting of the invention. In the drawings, the same units/elements are denoted by the same reference numerals.
Unless otherwise defined, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Further, it will be understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.
Fig. 1 is a flow diagram of a centralized photovoltaic access capability determination method 100 that accounts for short circuit capacity constraints, according to an embodiment of the invention. As shown in fig. 1, in the centralized photovoltaic access capability determining method considering short-circuit capacity constraint provided in the embodiment of the present invention, a centralized photovoltaic access capability calculating method considering short-circuit capacity constraint performs short-circuit current calculation on buses of each voltage class of a photovoltaic centralized grid-connected point, and determines a photovoltaic maximum accessible capacity of the centralized grid-connected point according to a margin between a short-circuit current calculation index of each bus and a short-circuit capacity limit value, so as to avoid a problem that a short-circuit current of a grid-connected point exceeds a standard after a large-scale photovoltaic centralized access; the method can be suitable for safety and stability evaluation of a large-scale power system, has good computability and wide adaptability, and can be used as a main analysis tool of a dispatching operation and planning and designing department. The method 100 for determining the centralized photovoltaic access capacity considering the short-circuit capacity constraint, provided by the embodiment of the invention, starts from step 101, and builds a first simulation model of each photovoltaic power station and a grid-connected system based on a planning scheme in step 101.
Referring to fig. 2, in the present invention, it is necessary to first investigate and collect regional power grid data, grid-connected planning data of each photovoltaic power station, and data of each bus switch of a centralized grid-connected point, and then perform modeling of regional power grid simulation data and simulation modeling of a photovoltaic grid-connected system, so as to obtain a first simulation model.
The method for researching and collecting regional power grid data, grid-connected planning data of each photovoltaic power station and bus switch data of centralized grid-connected points comprises the following steps:
step 1-1: the present situation and planning data of the regional power grid are investigated, which comprises: the network frame structure, the generator parameters, the load parameters, the line parameters, the transformer parameters and the like;
step 1-2: the current situation and planning data of each photovoltaic power station are investigated, which comprises: the method comprises the following steps of (1) photovoltaic power station installed capacity, photovoltaic unit types and parameters thereof, photovoltaic grid-connected planning schemes, boosting variable parameters, grid-connected line parameters and the like;
step 1-3: the bus switch interruption capacity of each voltage grade of the grid-connected point is researched and concentrated, and the short-circuit current margin index I of each bus is determined tgi 。
The method for carrying out regional power grid simulation data modeling and photovoltaic grid-connected system simulation modeling so as to obtain a first simulation model comprises the following steps:
step 2-1: building a regional power grid for simulating load flow and stable calculation data;
step 2-2: determining an initial value of the photovoltaic grid-connected capacity under a planning scheme to be Q, wherein Q is the sum of installed capacities of all photovoltaic power stations;
step 2-3: and (3) establishing load flow and stable calculation data for power grid simulation of each photovoltaic power station and a grid-connected system thereof, so as to obtain a first simulation model.
In step 102, a photovoltaic maximum accessible capacity raw value of a centralized grid-connected point under a planning scheme is determined based on a current first simulation model.
Preferably, the determining a photovoltaic maximum accessible capacity raw value of a centralized grid-connected point under a planning scheme based on the first simulation model includes:
calculating short-circuit current based on the first simulation model, and determining a first short-circuit current level of each voltage grade bus at a centralized grid-connected point under a planning scheme;
determining a first short-circuit current margin value corresponding to each bus according to the first short-circuit current level and a preset upper limit of a switch interruption capacity corresponding to each bus;
and if the first short-circuit current margin values corresponding to the buses are smaller than the preset short-circuit current margin threshold value corresponding to the corresponding bus, determining the maximum photovoltaic accessible capacity original value of the centralized grid-connected point under the planning scheme according to the current photovoltaic grid-connected capacity value.
Preferably, wherein the method further comprises:
and if the first short-circuit current margin value corresponding to each bus is not satisfied and is smaller than the preset short-circuit current margin threshold value corresponding to the corresponding bus, updating the photovoltaic grid-connected capacity to be the sum of the preset step length threshold value and the current photovoltaic grid-connected capacity, updating the first simulation model according to the updated photovoltaic grid-connected capacity, and returning to the step 102 for recalculation.
In the invention, the process of calculating the original value of the maximum photovoltaic accessible capacity under the centralized grid-connected point under the photovoltaic grid-connected planning scheme comprises the following steps:
step 3-1: determining boundary conditions (namely, consideration factors) for short-circuit current calculation according to actual scheduling operation experience of a power grid;
step 3-2: calculating based on the boundary conditions, operating a short-circuit current calculation program, and calculating a first short-circuit current level of each voltage grade bus at a centralized grid-connected point under a planning scheme;
step 3-3: combining the upper limit of the switch breaking capacity of each bus and the corresponding first short-circuit current level and short-circuit current margin index I tgi And calculating the original value of the maximum photovoltaic accessible capacity of the centralized grid-connected point under the planning scheme, wherein the method comprises the following steps:
(1) Calculating short-circuit current margin value I of each bus according to the upper limit of the switch breaking capacity of each bus and the first short-circuit current level i ；
(2) Judging short circuit current margin value I of each bus i Whether all meet the index I smaller than the short-circuit current margin tgi If yes, directly determining a planning schemeOriginal value of maximum accessible capacity of photovoltaic connected below concentrated grid-connected point Original Qmax = Q-delta Q, wherein Q is the current photovoltaic grid-connected capacity, and delta Q is a preset step length; otherwise, switching to the step (3);
(3) And (4) increasing the grid-connected capacity Q of the photovoltaic power station according to a preset step length so as to update the grid-connected capacity of the photovoltaic power station, and turning to the step 2-3, updating the load flow and stability calculation data of each photovoltaic power station and the grid-connected system of each photovoltaic power station so as to update the first simulation model.
The preset step length can be set according to requirements, for example, the preset step length can be set to 10MW or 50MW.
In step 103, each photovoltaic power station is modified to be an access mode of first series connection and then parallel connection to determine a photovoltaic grid-connected optimization scheme, and the current first model is updated based on the photovoltaic grid-connected optimization scheme to build a second simulation model of each photovoltaic power station and a grid-connected system.
In the present invention, continuing with the above-described manner as an example, step 4 includes: after the original value of the maximum photovoltaic access capacity is determined, optimizing an access mode of firstly connecting the photovoltaic power stations in series and then connecting the photovoltaic power stations in a grid mode, and determining an initial value Qo of the photovoltaic grid-connected capacity in the access mode (the initial value of the photovoltaic grid-connected capacity at the moment is the corresponding photovoltaic grid-connected capacity when the original value of the maximum photovoltaic access capacity is determined); and updating BPA tide and stable calculation data of each photovoltaic power station and a grid-connected system thereof according to a photovoltaic grid-connected optimization scheme when photovoltaic is connected in series and then connected in a grid so as to update the current first model and establish a second simulation model of each photovoltaic power station and the grid-connected system.
In step 104, a photovoltaic maximum accessible capacity optimization value of a centralized grid-connected point under the photovoltaic grid-connected optimization scheme is determined based on the current second simulation model.
Preferably, the determining and optimizing the maximum photovoltaic accessible capacity of the grid-connected point in the lower set of the grid-connected photovoltaic optimization scheme based on the current second simulation model includes:
calculating short-circuit current based on the second simulation model, and determining a second short-circuit current level of each voltage grade bus at a centralized grid-connected point under an optimization scheme;
determining a second short-circuit current margin value corresponding to each bus according to the second short-circuit current level and a preset switch interruption capacity upper limit corresponding to each bus;
and if the second short-circuit current margin values corresponding to the buses are smaller than the preset short-circuit current margin threshold value corresponding to the corresponding bus, determining the photovoltaic maximum accessible capacity optimization value of the centralized grid-connected point under the planning scheme according to the current photovoltaic grid-connected capacity value.
Preferably, wherein the method further comprises:
and if the second short-circuit current margin value corresponding to each bus is not met and is smaller than the preset short-circuit current margin threshold value corresponding to the corresponding bus, updating the photovoltaic grid-connected capacity to be the sum of the preset step length threshold value and the current photovoltaic grid-connected capacity, updating the second simulation model according to the updated photovoltaic grid-connected capacity, and returning to the step 104 for recalculation.
In the invention, under the photovoltaic grid-connected optimization scheme, the calculation process of the photovoltaic maximum accessible capacity optimization value under the centralized grid-connected point comprises the following steps;
step 5-1: running a short-circuit current calculation program, and calculating a second short-circuit current level of each voltage grade bus at a centralized grid-connected point under an optimization scheme;
step 5-2: combining the upper limit of the switch breaking capacity of each bus and the corresponding second short-circuit current level and short-circuit current margin index I tgi And calculating the photovoltaic maximum accessible capacity optimization value of the centralized grid-connected point under the optimization scheme, wherein the calculation method comprises the following steps of:
(1) Calculating short-circuit current tolerance value I of each bus according to the upper limit of the switch interruption capacity of each bus and the second short-circuit current level i ；
(2) Judging short circuit current margin value I of each bus i Whether all meet the index I smaller than the short-circuit current margin tgi If yes, directly determining the photovoltaic maximum accessible capacity optimization value Q connected under the centralized grid-connected point under the optimization scheme max you ＝Q o -△Q，Q o The current photovoltaic grid-connected capacity is obtained, and the delta Q is a preset step length; otherwise, turning to the step (3);
(3) And (4) increasing the grid-connected capacity Q of the photovoltaic power station according to a preset step length so as to update the grid-connected capacity of the photovoltaic power station, and updating BPA power flow and stable calculation data of each photovoltaic power station and the grid-connected system thereof according to the step 4 so as to update the current first model, build a second simulation model of each photovoltaic power station and the grid-connected system, and recalculate the second simulation model.
In step 105, the photovoltaic access capacity is determined according to the original value of the photovoltaic maximum accessible capacity and the optimized value of the photovoltaic maximum accessible capacity.
Preferably, the determining the photovoltaic access capability according to the original value of the photovoltaic maximum accessible capacity and the optimized value of the photovoltaic maximum accessible capacity includes:
if photovoltaic plan installed capacity Q Planning <Q max original If yes, determining to allow access to the grid-connected point;
if photovoltaic plan installed capacity Q max original <Q Planning <Q max you Determining that the grid-connected point is allowed to be accessed and each photovoltaic power station needs to be connected in series and then connected in a grid;
if photovoltaic plan installed capacity Q Planning >Q max you Determining that the accessible range of the grid-connected point is exceeded; wherein Q is max original The maximum photovoltaic accessible capacity is an original value; q max you Optimizing the value for the maximum accessible photovoltaic capacity.
In the invention, the requirement of the maximum photovoltaic access capacity under the centralized grid-connected point is comprehensively analyzed, and the original value Q of the maximum photovoltaic access capacity under the centralized grid-connected point is combined with a planning scheme max original And a photovoltaic maximum accessible capacity optimization value Q max you Comprehensively analyzing the requirement of concentrating the grid-connected point on the scale of the photovoltaic installation machine connected below the grid-connected point to meet the short-circuit current limiting condition, namely: photovoltaic planning installed capacity Q Planning <Q max original Then, the point-to-point can be accessed; photovoltaic planning installed capacity Q max original <Q Planning <Q max you When the grid-connected point is accessed, the photovoltaic power stations need to be connected in series and then connected in a grid; photovoltaic planning installed capacity Q Planning >Q max you And then, the access range of the grid-connected point is exceeded.
According to the method, three photovoltaic power stations S-1 (50 MW), S-2 (50 MW) and S-3 (100 MW) are planned to be intensively accessed to the 220kV side of JSZ of a 500kV power station according to the distribution condition of photovoltaic resources in a provincial power grid. The voltage at the photovoltaic generator terminal is 0.69kV, and the photovoltaic generator terminal is connected to a system side bus through two-stage boosting of 0.69kV/35kV/220 kV. Rated breaking current of a 220kV side bus switch of a transformer substation Z is 50kA, and short-circuit current margin is 2%; the rated breaking current of a 500kV side bus switch is 63kA, and the margin between the short-circuit current calculation index of the bus and the short-circuit capacity limit value is 5%. The short-circuit current calculation conditions are set as follows: the system is started fully, the voltage coefficient is 1.05, the static load is considered, the parallel compensation is considered, and the line charging power is considered.
Under the planning scheme, the photovoltaic grid-connected capacity Q =50 +100=200MW, a short-circuit current calculation program SCCP is adopted, and the three-phase short-circuit current margin values of the transformer substation Z at the sides of 500kV and 220kV are shown as follows:
according to the calculation results in the table, if the three-phase short-circuit current margin of each bus of the photovoltaic grid-connected system does not exceed the standard under the optimization scheme, the iterative increase process of the scale of the photovoltaic power station is started, and when the photovoltaic grid-connected capacity under the planning scheme is increased to Q =400MW, the three-phase short-circuit current margin values of the transformer substation Z at the sides of 500kV and 220kV are as shown in the following table:
according to the calculation results in the table, if the three-phase short-circuit current margin of the Z bus at the 220kV side exceeds the standard, the maximum photovoltaic accessible capacity Q under the original planning scheme is obtained max original =350MW. And a photovoltaic power station grid-connected scheme series connection optimization process is switched, and the optimized photovoltaic grid-connected capacity Qo =400MW. The short-circuit current calculation program SCCP is adopted, and the three-phase short-circuit current margin values of the transformer substation Z at the sides of 500kV and 220kV are shown as the following table:
according to the calculation results in the table, if the three-phase short-circuit current margin of each bus of the photovoltaic grid-connected system under the optimization scheme does not exceed the standard, the iterative increase process of the scale of the photovoltaic power station is started, and when the photovoltaic grid-connected capacity under the optimization scheme is increased to Qo =450MW, the three-phase short-circuit current margin values of the transformer substation Z at the sides of 500kV and 220kV are as shown in the following table:
according to the calculation results in the table, if the margin of the calculated value of the three-phase short circuit current of the Z bus at the 220kV side exceeds the standard, the maximum photovoltaic access capacity Q under the optimization scheme is obtained max you ＝400MW。
Comprehensively analyzing the requirement of concentrating the grid-connected point on the scale of the photovoltaic installation connected below the grid-connected point to meet the short-circuit current limiting condition, namely: photovoltaic planning installed capacity Q connected with transformer substation Z in a downward connection mode Planning <At 350MW, the point of connection can be accessed; photovoltaic planning installed capacity 350 under substation Z<Q Planning <400 hours, the grid-connected point can be considered to be accessed, but due to the limitation of the short-circuit current capacity of the 220kV side bus of the grid-connected point, each photovoltaic power station needs to adopt an access mode of firstly connecting in series and then connecting in a grid; photovoltaic planning installed capacity Q connected with substation Z in a downward connection mode Planning >And when 400, the short-circuit current of the 220kV side bus of the grid-connected point is limited, so that the acceptable range of the grid-connected point is exceeded.
The centralized photovoltaic access capacity calculation method considering the short circuit capacity constraint is convenient to calculate and clear in concept, and is applied and verified in practical power grids such as Qinghai power grids, gansu power grids, shaanxi power grids and the like.
Fig. 3 is a schematic block diagram of a centralized photovoltaic access capability determination system 300 that accounts for short circuit capacity constraints, according to an embodiment of the invention. As shown in fig. 3, a centralized photovoltaic access capability determining system 300 considering short circuit capacity constraint provided by the embodiment of the present invention includes: a first simulation model building unit 301, a photovoltaic maximum accessible capacity raw value determining unit 302, a second simulation model building unit 303, a photovoltaic maximum accessible capacity optimized value determining unit 304 and a photovoltaic access capability determining unit 305.
Preferably, the first simulation model building unit 301 builds a first simulation model of each photovoltaic power station and grid-connected system based on a planning scheme.
Preferably, the original value determining unit 302 of maximum photovoltaic accessible capacity is configured to determine the original value of maximum photovoltaic accessible capacity of centralized grid-connected points under a planning scheme based on the current first simulation model.
Preferably, the determining unit 302 for original value of maximum photovoltaic accessible capacity of a centralized grid-connected point under a planning scheme based on the first simulation model includes:
calculating short-circuit current based on the first simulation model, and determining a first short-circuit current level of each voltage grade bus at a centralized grid-connected point under a planning scheme;
determining a first short-circuit current margin value corresponding to each bus according to the first short-circuit current level and a preset switch interruption capacity upper limit corresponding to each bus;
and if the first short-circuit current margin value corresponding to each bus is smaller than the preset short-circuit current margin threshold value corresponding to the corresponding bus, determining the maximum photovoltaic accessible capacity original value of the centralized grid-connected points under the planning scheme according to the current photovoltaic grid-connected capacity value.
Preferably, the original value determining unit 302 for maximum photovoltaic accessible capacity further includes:
if the first short-circuit current margin value corresponding to each bus is not met and is smaller than the preset short-circuit current margin threshold value corresponding to the corresponding bus, the photovoltaic grid-connected capacity is updated to be the sum of the preset step length threshold value and the current photovoltaic grid-connected capacity, the first simulation model is updated according to the updated photovoltaic grid-connected capacity, and recalculation is carried out.
Preferably, the second simulation model building unit 303 is configured to modify each photovoltaic power station into an access manner of first connecting in series and then connecting in parallel, to determine a photovoltaic grid-connected optimization scheme, and update the current first model based on the photovoltaic grid-connected optimization scheme, so as to build a second simulation model of each photovoltaic power station and the grid-connected system.
Preferably, the photovoltaic maximum accessible capacity optimized value determining unit 304 is configured to determine and obtain a photovoltaic maximum accessible capacity optimized value of a centralized grid-connected point under the photovoltaic grid-connected optimization scheme based on the current second simulation model.
Preferably, the determining unit 304 for the maximum photovoltaic accessible capacity optimized value determines the maximum photovoltaic accessible capacity optimized value of the grid-connected point in the centralized grid-connected point under the grid-connected photovoltaic optimization scheme based on the current second simulation model, and includes:
calculating short-circuit current based on the second simulation model, and determining a second short-circuit current level of each voltage grade bus at the centralized grid-connected point under the optimization scheme;
determining a second short-circuit current margin value corresponding to each bus according to the second short-circuit current level and a preset upper limit of a switch interruption capacity corresponding to each bus;
and if the second short-circuit current margin values corresponding to the buses are smaller than the preset short-circuit current margin threshold value corresponding to the corresponding bus, determining the photovoltaic maximum accessible capacity optimization value of the centralized grid-connected point under the planning scheme according to the current photovoltaic grid-connected capacity value.
Preferably, the photovoltaic maximum accessible capacity optimization value determining unit 304 further includes:
and if the condition that the second short-circuit current margin value corresponding to each bus is not met is smaller than the preset short-circuit current margin threshold value corresponding to the corresponding bus, updating the photovoltaic grid-connected capacity to be the sum of the preset step length threshold value and the current photovoltaic grid-connected capacity, updating the second simulation model according to the updated photovoltaic grid-connected capacity, and recalculating.
Preferably, the photovoltaic access capability determining unit 305 is configured to determine the photovoltaic access capability according to the original value of the photovoltaic maximum accessible capacity and the optimized value of the photovoltaic maximum accessible capacity.
Preferably, the photovoltaic access capability determining unit 305 determines the photovoltaic access capability according to the original value of the photovoltaic maximum accessible capacity and the optimized value of the photovoltaic maximum accessible capacity, including:
if photovoltaic plan installed capacity Q Planning <Q max original If yes, determining to allow access to the grid-connected point;
if photovoltaic plan installed capacity Q max original <Q Planning <Q max you Determining that the grid-connected point is allowed to be accessed and each photovoltaic power station needs to be connected in series and then connected in a grid;
if photovoltaic plan installed capacity Q Planning >Q max you Determining that the accessible range of the grid-connected point is exceeded; wherein Q is max original The maximum photovoltaic accessible capacity is an original value; q max you Optimizing the value for the maximum photovoltaic accessible capacity.
The centralized photovoltaic access capability determining system 300 considering the short-circuit capacity constraint according to the embodiment of the present invention corresponds to the centralized photovoltaic access capability determining method 100 considering the short-circuit capacity constraint according to another embodiment of the present invention, and is not described herein again.
The invention has been described with reference to a few embodiments. However, other embodiments of the invention than the one disclosed above are equally possible within the scope of the invention, as would be apparent to a person skilled in the art from the appended patent claims.
Generally, all terms used in the claims are to be interpreted according to their ordinary meaning in the technical field, unless explicitly defined otherwise herein. All references to "a/an/the [ device, component, etc ]" are to be interpreted openly as referring to at least one instance of said device, component, etc., unless explicitly stated otherwise. The steps of any method disclosed herein do not have to be performed in the exact order disclosed, unless explicitly stated.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and so forth) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.
Claims (12)
1. A method of centralized photovoltaic access capability determination that accounts for short circuit capacity constraints, the method comprising:
step 1, building a first simulation model of each photovoltaic power station and a grid-connected system based on a planning scheme;
step 2, determining an original value of the maximum photovoltaic accessible capacity of a centralized grid-connected point under a planning scheme based on a current first simulation model;
step 3, modifying each photovoltaic power station into an access mode of firstly connecting in series and then connecting in parallel to determine a photovoltaic grid-connected optimization scheme, and updating the current first model based on the photovoltaic grid-connected optimization scheme to build a second simulation model of each photovoltaic power station and a grid-connected system;
step 4, determining a photovoltaic maximum accessible capacity optimization value of a centralized grid-connected point under a photovoltaic grid-connected optimization scheme based on a current second simulation model;
and 5, determining photovoltaic access capacity according to the original value of the maximum photovoltaic accessible capacity and the optimized value of the maximum photovoltaic accessible capacity.
2. The method of claim 1, wherein determining a photovoltaic maximum accessible capacity raw value of a centralized grid-connected point under a planning scheme based on the first simulation model comprises:
calculating short-circuit current based on the first simulation model, and determining a first short-circuit current level of each voltage grade bus at a centralized grid-connected point under a planning scheme;
determining a first short-circuit current margin value corresponding to each bus according to the first short-circuit current level and a preset switch interruption capacity upper limit corresponding to each bus;
and if the first short-circuit current margin values corresponding to the buses are smaller than the preset short-circuit current margin threshold value corresponding to the corresponding bus, determining the maximum photovoltaic accessible capacity original value of the centralized grid-connected point under the planning scheme according to the current photovoltaic grid-connected capacity value.
3. The method of claim 2, further comprising:
and if the first short-circuit current margin value corresponding to each bus is not met and is smaller than the preset short-circuit current margin threshold value corresponding to the corresponding bus, updating the photovoltaic grid-connected capacity to be the sum of the preset step length threshold value and the current photovoltaic grid-connected capacity, updating the first simulation model according to the updated photovoltaic grid-connected capacity, and returning to the step 2 for recalculation.
4. The method according to claim 1, wherein the determining and concentrating the optimal value of the maximum photovoltaic accessible capacity of the grid-connected point under the grid-connected photovoltaic optimization scheme based on the current second simulation model comprises:
calculating short-circuit current based on the second simulation model, and determining a second short-circuit current level of each voltage grade bus at a centralized grid-connected point under an optimization scheme;
determining a second short-circuit current margin value corresponding to each bus according to the second short-circuit current level and a preset switch interruption capacity upper limit corresponding to each bus;
and if the second short-circuit current margin values corresponding to the buses are smaller than the preset short-circuit current margin threshold value corresponding to the corresponding bus, determining the photovoltaic maximum accessible capacity optimization value of the centralized grid-connected point under the planning scheme according to the current photovoltaic grid-connected capacity value.
5. The method of claim 4, further comprising:
and if the second short-circuit current margin value corresponding to each bus is not met and is smaller than the preset short-circuit current margin threshold value corresponding to the corresponding bus, updating the photovoltaic grid-connected capacity to be the sum of the preset step length threshold value and the current photovoltaic grid-connected capacity, updating the second simulation model according to the updated photovoltaic grid-connected capacity, and returning to the step 4 for recalculation.
6. The method of claim 1, wherein determining the photovoltaic access capability according to the original value of the photovoltaic maximum accessible capacity and the optimized value of the photovoltaic maximum accessible capacity comprises:
if photovoltaic plan installed capacity Q Planning <Q max original If yes, determining to allow access to the grid-connected point;
if photovoltaic plan installed capacity Q max original <Q Planning <Q max you Determining that the grid-connected point is allowed to be accessed and each photovoltaic power station needs to be connected in series and then connected in a grid;
if photovoltaic plan installed capacity Q Planning >Q max you Determining that the accessible range of the grid-connected point is exceeded; wherein Q is max original The maximum photovoltaic accessible capacity original value; q max you Optimizing the value for the maximum accessible photovoltaic capacity.
7. A centralized photovoltaic access capability determination system that accounts for short circuit capacity constraints, the system comprising:
the first simulation model building unit is used for building first simulation models of the photovoltaic power stations and the grid-connected system based on a planning scheme;
the photovoltaic maximum accessible capacity original value determining unit is used for determining a photovoltaic maximum accessible capacity original value of a centralized grid-connected point under a planning scheme based on a current first simulation model;
the second simulation model building unit is used for modifying each photovoltaic power station into an access mode of firstly connecting in series and then connecting in parallel to determine a photovoltaic grid-connected optimization scheme, and updating the current first model based on the photovoltaic grid-connected optimization scheme to build a second simulation model of each photovoltaic power station and a grid-connected system;
the photovoltaic maximum accessible capacity optimization value determining unit is used for determining a photovoltaic maximum accessible capacity optimization value of a centralized grid-connected point under the photovoltaic grid-connected optimization scheme based on the current second simulation model;
and the photovoltaic access capacity determining unit is used for determining the photovoltaic access capacity according to the original value of the photovoltaic maximum accessible capacity and the optimized value of the photovoltaic maximum accessible capacity.
8. The system according to claim 7, wherein the original value determining unit of maximum photovoltaic accessible capacity determines the original value of maximum photovoltaic accessible capacity of the centralized grid-connected point under the planning scheme based on the first simulation model, and comprises:
calculating short-circuit current based on the first simulation model, and determining a first short-circuit current level of each voltage grade bus at a centralized grid-connected point under a planning scheme;
determining a first short-circuit current margin value corresponding to each bus according to the first short-circuit current level and a preset upper limit of a switch interruption capacity corresponding to each bus;
and if the first short-circuit current margin values corresponding to the buses are smaller than the preset short-circuit current margin threshold value corresponding to the corresponding bus, determining the maximum photovoltaic accessible capacity original value of the centralized grid-connected point under the planning scheme according to the current photovoltaic grid-connected capacity value.
9. The system of claim 8, wherein the photovoltaic maximum accessible capacity raw value determining unit further comprises:
if the first short-circuit current margin value corresponding to each bus is not met and is smaller than the preset short-circuit current margin threshold value corresponding to the corresponding bus, the photovoltaic grid-connected capacity is updated to be the sum of the preset step length threshold value and the current photovoltaic grid-connected capacity, the first simulation model is updated according to the updated photovoltaic grid-connected capacity, and recalculation is carried out.
10. The system according to claim 7, wherein the pv maximum accessible capacity optimization value determining unit determines the pv maximum accessible capacity optimization value of the grid-connected point under the pv grid-connected optimization scheme based on the current second simulation model, and includes:
calculating short-circuit current based on the second simulation model, and determining a second short-circuit current level of each voltage grade bus at a centralized grid-connected point under an optimization scheme;
determining a second short-circuit current margin value corresponding to each bus according to the second short-circuit current level and a preset switch interruption capacity upper limit corresponding to each bus;
and if the second short-circuit current margin value corresponding to each bus is smaller than the preset short-circuit current margin threshold value corresponding to the corresponding bus, determining the photovoltaic maximum accessible capacity optimization value of the concentrated grid-connected points under the planning scheme according to the current photovoltaic grid-connected capacity value.
11. The system of claim 10, wherein the photovoltaic maximum accessible capacity optimization value determination unit further comprises:
and if the condition that the second short-circuit current margin value corresponding to each bus is not met is smaller than the preset short-circuit current margin threshold value corresponding to the corresponding bus, updating the photovoltaic grid-connected capacity to be the sum of the preset step length threshold value and the current photovoltaic grid-connected capacity, updating the second simulation model according to the updated photovoltaic grid-connected capacity, and recalculating.
12. The system of claim 7, wherein the photovoltaic access capability determining unit determines the photovoltaic access capability according to the photovoltaic maximum accessible capacity original value and the photovoltaic maximum accessible capacity optimized value, and comprises:
if photovoltaic plan installed capacity Q Planning <Q max original If yes, determining to allow access to the grid-connected point;
if photovoltaic plan installed capacity Q max original <Q Planning <Q max you Determining that the grid-connected point is allowed to be accessed and each photovoltaic power station needs to be connected in series and then connected in a grid;
if photovoltaic plan installed capacity Q Planning >Q max you Determining that the accessible range of the grid-connected point is exceeded; wherein Q max original The maximum photovoltaic accessible capacity is an original value; q max you To be maximally connectable to photovoltaicAnd entering a capacity optimization value.
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