CN113642195A - New energy field station-level modeling practical equivalence method and device - Google Patents
New energy field station-level modeling practical equivalence method and device Download PDFInfo
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Abstract
The invention discloses a new energy field station-level modeling practical equivalence method, which comprises the following steps: determining the composition of an equivalent structure of the new energy station; determining the number of equivalent units in an equivalent model of the new energy station according to the impedance distribution and the power distribution in the equivalent structure; and constructing an equivalent model of the new energy station comprising the static reactive power compensation device and the equivalent units according to the number of the equivalent units. On the premise of ensuring the simulation scale and speed of the power grid, the response characteristic of the new energy station is more accurately and truly embodied. The problem of the requirement of simulation analysis on the new energy station equivalent model is solved.
Description
Technical Field
The application relates to the field of electric power systems, in particular to a new energy field station-level modeling practical equivalence method and device.
Background
The new energy power station generally comprises a plurality of units, the model order is high, the nonlinear characteristic is serious, and therefore the problem of non-convergence of stable calculation can be caused when a detailed model of the wind/photovoltaic power station is established for analysis, so that the complex structure of the new energy power station needs to be simplified into a single-machine or multi-machine model, and equivalent calculation is carried out on each operation parameter.
In the research of new energy grid connection problems, the equivalent modeling methods for new energy stations mainly comprise two types: the first is a detailed model, namely a full simulation model composed of each power generation unit model, power transmission lines, transformers and the like in a station. And the other is an aggregation model, namely, a single generator set is used for equivalent of the whole station in the research of the power system, so that the external characteristics are consistent. At present, in the simulation calculation of a large power grid or a regional power grid, the electromechanical and electromagnetic transient simulation generally adopts the latter method, namely a single-machine multiplication method, so as to improve the simulation efficiency and the convergence, but the influence of current collection line parameters and wind speed in a new energy station is ignored, and certain errors can be generated.
In the wind power field and the photovoltaic power station in the extra-high voltage direct current near area, the transient overvoltage after the locking of the direct current commutation failure is restrained, in simulation, the wind power plant or the photovoltaic power plant fails to be disconnected due to high voltage ride through, which also becomes one of the main restriction factors for new energy cross-regional consumption, however, the single-machine multiplication model adopted in the current simulation does not consider the difference of the parameters and the power of the current collecting line in the wind power plant or the photovoltaic power station, after the difference of the current collecting circuits inside the new energy station is considered, the transient voltage rise at the wind power end or the photovoltaic end is reduced and is closer to the reality, therefore, how to reflect the real response process inside the wind power plant/photovoltaic power station more truly on the premise of considering both rapidity and convergence of large power grid simulation, and the method is easy for engineering implementation and application, and is convenient for engineering actual operators to understand the equivalent model, which is a problem to be solved urgently at present.
Disclosure of Invention
In order to solve the above problems, the present application provides a new energy field station-level modeling practical equivalence method, including:
determining a composition structure of an equivalent unit of the new energy station;
determining the number of equivalent units in an equivalent model of the new energy station according to the impedance distribution characteristics and the power distribution characteristics in the composition structure;
and constructing a new energy station equivalent model comprising a static reactive power compensation device and the equivalent units according to the number of the equivalent units.
Preferably, the structure of the equivalent unit of the new energy station includes:
the system comprises an equivalent new energy unit, an equivalent box type transformer, equivalent impedance of a current collection line, a main transformer and a field station coordination control unit.
Preferably, determining the number of equivalent units in the equivalent model of the new energy station according to the impedance distribution characteristics and the power distribution characteristics in the composition structure, includes:
determining the number n of equivalent units only considering the impedance distribution characteristics in the equivalent structure, wherein n is a positive integer;
determining the number m of equivalent units only considering the power distribution characteristics in the equivalent structure, wherein m is a positive integer;
determining the number of equivalent units considering the impedance distribution characteristics and the power distribution characteristics in the composition structure simultaneously as N according to the number N of equivalent units of the impedance distribution characteristics and the number m of equivalent units of the power distribution characteristics, wherein N is specifically,
N=n*m。
preferably, the method further comprises the following steps:
the values of the equivalent unit number n of the impedance distribution characteristics and the equivalent unit number m of the power distribution characteristics are respectively n belonging to {1, 2} and m belonging to {1, 2};
and determining the value of the equivalent unit number N of the impedance distribution characteristic and the power distribution characteristic as N belonging to {1, 2, 4} according to the values of N and m.
Preferably, according to the values of N and m, the value of the equivalent unit number N of the impedance distribution and power distribution characteristics is determined to be N ∈ {1, 2, 4}, and includes:
when N and m respectively take values of 1, determining the number N of the equivalent machine sets of the impedance distribution characteristic and the power distribution characteristic as 1 by considering the equivalent machine set 1 of the power distribution characteristic and the equivalent machine set 1 of the impedance distribution characteristic;
when the value of N is 2 and the value of m is 1, determining that the number N of the equivalent machine sets of the impedance distribution characteristic and the power distribution characteristic is 2 by considering the equivalent machine set 2 of the power distribution characteristic and the equivalent machine set 1 of the impedance distribution characteristic;
when the value of N is 1 and the value of m is 2, determining that the number N of the equivalent machine sets of the impedance distribution characteristic and the power distribution characteristic is 2 by considering the equivalent machine set 1 of the power distribution characteristic and the equivalent machine set 2 of the impedance distribution characteristic;
when N and m respectively take values of 2, determining that the number N of the equivalent machine sets of the impedance distribution characteristic and the power distribution characteristic is 4 by considering the equivalent machine set 2 of the power distribution characteristic and the equivalent machine set 2 of the impedance distribution characteristic.
Preferably, the method further comprises the following steps: and determining a control mode of the equivalent unit, wherein the control mode is the same as that of the actual new energy unit.
Based on the same invention concept, the application also provides a new energy field station-level modeling practical equivalent device, which comprises:
the equivalent unit determining unit is used for determining the composition structure of the equivalent unit of the new energy station;
the equivalent unit number determining unit is used for determining the number of equivalent units in an equivalent model of the new energy station according to the impedance distribution characteristic and the power distribution characteristic in the equivalent composition structure;
and the equivalence model building unit is used for building a new energy station equivalence model comprising the static reactive power compensation device and the equivalence sets according to the number of the equivalence sets.
Preferably, the structure of the equivalent unit of the new energy station includes:
the system comprises an equivalent new energy unit, an equivalent box type transformer, equivalent impedance of a current collection line, a static reactive compensator, a main transformer and a station coordination control unit.
Preferably, the equivalent unit number determining unit includes:
the equivalent unit number n determining subunit is used for determining the equivalent unit number n only considering the impedance distribution characteristics in the equivalent structure, wherein n is a positive integer;
an equivalent unit number m determining subunit, configured to determine an equivalent unit number m considering only power distribution characteristics in the equivalent structure, where m is a positive integer;
an equivalent unit number N determining subunit, configured to determine, according to the equivalent unit number N of the impedance distribution characteristic and the equivalent unit number m of the power distribution characteristic, that the equivalent unit number that simultaneously considers the impedance distribution characteristic and the power distribution characteristic in the equivalent structure is N, where N is specifically,
N=n*m。
preferably, the method further comprises the following steps: and the control mode determining unit is used for determining the control mode of the equivalent unit, and the control mode is the same as that of the actual new energy unit.
Drawings
Fig. 1 is a schematic flow chart of a new energy field station-level modeling practical equivalence method provided in an embodiment of the present application;
FIG. 2 is an equivalent schematic diagram of a new energy field station-level modeling structure based on impedance and power distribution according to an embodiment of the present application;
fig. 3 is a schematic diagram of active power control coordination of a new energy station according to an embodiment of the present application;
fig. 4 is a schematic diagram of coordination reactive power control of a new energy station according to an embodiment of the present application;
fig. 5 is a wiring diagram of a new energy field model (2 × 2) according to an embodiment of the present application;
FIG. 6 is a graph of three model AC line N-1 fault fan-side (690V voltage versus curve (p.u.));
FIG. 7 is a 35kV bus voltage curve (p.u.) of an AC line N-1 fault station of three models according to an embodiment of the present application;
FIG. 8 is a 220kV bus voltage curve (p.u.) sent out from an AC line N-1 fault wind field according to three models related to the embodiment of the application;
FIG. 9 is an outgoing active power curve of an AC line N-1 fault station of three models according to an embodiment of the present application;
FIG. 10 is a graph of outgoing reactive power at a fault site of three model AC lines N-1 according to an embodiment of the present application;
fig. 11 is a schematic diagram of an equivalent device for station-level modeling of new energy resources provided by an embodiment of the present application.
Detailed Description
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. This application is capable of implementation in many different ways than those herein set forth and of similar import by those skilled in the art without departing from the spirit of this application and is therefore not limited to the specific implementations disclosed below.
Fig. 1 is a schematic flow chart of an equivalent method for new energy site-level modeling, which is provided by an embodiment of the present application, and the method provided in the first application is described in detail below with reference to fig. 1.
And S101, determining an equivalent unit composition structure of the new energy station.
FIG. 2 is a graph of impedance and power distribution based on embodiments of the present applicationThe equivalent schematic diagram of the new energy station level modeling structure comprises five parts in total, namely an equivalent new energy unit, an equivalent box type transformer, equivalent impedance of a current collection line, a main transformer and a station coordination control. Wherein TM is main transformer, ST is bypass switch, TSVGStep-down transformer, Q, for step-down SVGrefSVGGiving a reactive power regulation instruction under the SVG for field station coordination control, wherein V is a grid-connected point voltage, f is a grid-connected point frequency, W1 is an equivalent new energy unit 1, W2 is an equivalent new energy unit 2, WN is an equivalent new energy unit N, Z1 is an equivalent impedance of the equivalent new energy unit 1 connected with a main transformer, Z2 is an equivalent impedance of the equivalent new energy unit 2 connected with the main transformer, ZN is an equivalent impedance of the equivalent new energy unit N connected with the main transformer, T1 is an equivalent step-up transformer between the equivalent new energy unit 1 and the main transformer, T2 is an equivalent step-up transformer between the equivalent new energy unit 2 and the main transformer, TN is an equivalent step-up transformer between the equivalent new energy unit N and the main transformer, and P3838 is an equivalent step-up transformer between the equivalent new energy unit 2 and the main transformerref1Giving active power commands, Q, under the new energy unit 1 for station coordinated controlref1Giving reactive power commands, P, to the new energy unit 1 for station coordinated controlref2Giving active power commands, Q, under the new energy unit 2 for station coordinated controlref2Giving reactive power commands, P, to the new energy unit 2 for station coordinated controlrefNGiving the station coordinated control an active power command, Q, under the new energy unit NrefNAnd giving a reactive power instruction under the new energy source unit N for the station coordination control.
And S102, determining the number of equivalent units in an equivalent model of the new energy station according to the impedance distribution characteristics and the power distribution characteristics in the composition structure.
Determining the number n of equivalent units only considering the impedance distribution characteristics in the equivalent structure, wherein n is a positive integer;
determining the number m of equivalent units only considering the power distribution characteristics in the equivalent structure, wherein m is a positive integer;
according to the number N of equivalent units of the impedance distribution characteristic and the number m of equivalent units of the power distribution characteristic, determining that the number of equivalent units considering the impedance distribution characteristic and the power distribution characteristic in the equivalent structure is N, wherein N is specifically,
N=n*m。
the value of the equivalent unit number N of the impedance distribution characteristic and the value of the equivalent unit number m of the power distribution characteristic are respectively N belonging to {1, 2} and m belonging to {1, 2 }.
When N and m respectively take values of 1, determining the number N of the equivalent unit sets with the impedance distribution characteristics and the power distribution characteristics as 1 by considering the equivalent unit set 1 with the power distribution characteristics and the equivalent unit set 1 with the impedance distribution characteristics;
when the value of N is 2 and the value of m is 1, determining that the number N of the equivalent machine sets of the impedance distribution characteristic and the power distribution characteristic is 2 by considering the equivalent machine set 2 of the power distribution characteristic and the equivalent machine set 1 of the impedance distribution characteristic;
when the value of N is 1 and the value of m is 2, determining that the number N of the equivalent machine sets of the impedance distribution characteristic and the power distribution characteristic is 2 by considering the equivalent machine set 1 of the power distribution characteristic and the equivalent machine set 2 of the impedance distribution characteristic;
when N and m respectively take values of 2, determining that the number N of the equivalent machine sets of the impedance distribution characteristic and the power distribution characteristic is 4 by considering the equivalent machine set 2 of the power distribution characteristic and the equivalent machine set 2 of the impedance distribution characteristic.
Specifically, considering the convenience and operability of actual engineering calculation, on the premise of meeting the engineering precision requirement, N is set to be {1, 2}, m is set to be {1, 2}, namely the number N of equivalent modeling units is set to be {1, 2, 4}, and in total, a single-machine equivalent model, a 2-equivalent model considering a power 2 machine considering an impedance 1 machine, a 2-equivalent model considering a power 1 machine considering an impedance 2 machine, and a 4-equivalent model considering a power 2 machine considering an impedance 2 machine considering the impedance 2 machine.
N∈{1，2，4}
The photovoltaic power station is mainly a single-machine equivalent model in consideration of the connection structure and the grid-connected mode of the existing photovoltaic power station; the influence of line impedance on the plain wind power plant is small, and the 2-machine equivalent model result is mainly obtained by considering power 2 machines and impedance 1 machine; due to the fact that the line impedance difference is large when the distance between the wind turbines is long, a 2-machine equivalent model with power 1 machine and impedance 2 machine considered or a four-machine equivalent model with power 2 machine considered is considered according to the operating characteristics of the working conditions of the wind power plant and the large wind power plant in the mountainous area.
And S103, constructing a new energy station equivalent model comprising a static reactive power compensation device and the equivalent units according to the number of the equivalent units.
And after the number of the equivalent units in the equivalent model is determined, constructing a new energy station equivalent model containing the static reactive power compensation device according to the number of the equivalent units. The static reactive power compensation device is characterized in that different static circuit breakers are used for switching capacitors or reactors, so that the capacitors or the reactors have the capability of absorbing and emitting reactive current, and in order to improve the power factor of a power grid, stabilize the voltage of the power grid, inhibit system oscillation and the like, an equivalent model of a new energy station is constructed through the static reactive power compensation device and the equivalent set. Meanwhile, the connection type, the access transformation grade, the control bus and other conditions of the SVG in the new energy station with the power grid need to be determined, and the connection type, the access transformation grade, the control bus and other conditions of the SVG with the power grid are the same as the actual conditions. And determining a control mode of the equivalent unit, wherein the control mode is the same as that of the actual new energy unit.
Meanwhile, a control method of the site-level coordinated control, an active power instruction and a reactive power instruction issued to each new energy source unit, and a reactive power regulation instruction issued to the SVG are also determined, input signals of the site-level coordinated control are the grid frequency and the bus voltage of a grid-connected point of the new energy source site, and frequency and voltage signals are transferred to the new energy source unit and the SVG for regulation through a control means so as to realize grid-connected point frequency and voltage stabilization, wherein the site-level coordinated active control is shown in fig. 3, where Pplant is the active power output by the new energy source site, place _ ref is a given new energy source site active power reference value, freq is the grid frequency, freq _ ref is a given frequency reference value, fdb1 is a negative frequency deviation dead zone, fdb2 is a frequency deviation dead zone, Dup is a frequency up-down control factor, Ddn is a frequency down-down control factor, and Dup _ Pmax is an increased power limit, ddn _ Pmin is a drop output limit, Perrmax is a droop control power deviation upper limit, Perrmin is a droop control power deviation lower limit, PPOImax is a plant station level active PI control output upper limit, PPOImin is a plant station level active PI control output lower limit, Tlag is a plant station level active instruction lag time constant, Trp is a power sampling time constant, Trf is a frequency sampling time constant, Pplan _ flag is a field station level frequency regulation open-loop and closed-loop control setting signal, Freq _ flag is a frequency regulation setting signal, and Port is a field station coordination active control output instruction.
For the active control of the station coordination, different control schemes can be selected according to the system requirements. When Freq _ flag is 0, no matter Pvlan _ flag is 1 or 2, the coordination active control mode of the station is constant active control at the moment, namely active power is output according to the active command of the system; and when Freq _ flag is 1 and Pvlan _ flag is 1, the field station coordinated active control mode is open-loop frequency regulation control, the system active instruction is adjusted based on the actual frequency of the system and the given frequency reference value, and active power is output. When Freq _ flag is 1 and Pplant _ flag is 2, the station coordinated active control mode is closed-loop frequency regulation control, the system active instruction is adjusted based on the actual frequency of the system and a given frequency reference value, and active feedback is output through the actual output of the station to output active power.
The station coordinated reactive power control is shown in fig. 4, wherein Verg is a new energy station grid-connected point voltage, Vplant _ ref is a new energy station grid-connected point voltage reference value, Qplant is reactive power output by a new energy station, Qplant _ ref is a given new energy station reactive power reference value, PFplant is a given power factor, Kc is a reactive droop factor, Vpdb1 is a deviation dead zone negative value, Vpdb2 is a deviation dead zone positive value, Verrmax is an upper deviation limit, Verrmin is a lower deviation limit, Qpdb1 is a deviation dead zone negative value, Qpdb2 is a deviation dead zone positive value, qrrmax is an upper deviation limit, Qerrmin is a lower deviation limit, QPOImax is an upper PI reactive power control output limit, Tft is a time constant, Tfv is a time constant, Trp is a time constant of power sampling, PFplant _ flag is a given power factor control set signal, Vcmp _ flag is a reactive power control set signal, and Qplant _ flag is a given power control set signal, and the Port coordinates an active control output instruction for the station.
For the station coordinated reactive power control, different control schemes can be selected according to the system requirements. When the PFplant _ flag is 1, the Qplant _ flag is 1, and no matter the Vcmp _ flag is 1 or 2, the station coordinated reactive power control mode is constant reactive power control, namely reactive power is output according to a system reactive power instruction; when the PFplant _ flag is 2, the Qplant _ flag is 1, and no matter the Vcmp _ flag is 1 or 2, the station coordinated reactive power control mode is a constant power factor control mode, namely the output of the reactive power is controlled according to the given power factor; when Qplant _ flag is 2, Vcmp _ flag is 1, no matter PFplant _ flag is 1 or 2, the station coordinated reactive power control mode is constant voltage control, namely, the output of reactive power is controlled according to the given grid-connected point voltage reference value; when Qplant _ flag is 2 and Vcmp _ flag is 2, no matter PFplant _ flag is 1 or 2, the station coordinates the reactive power control mode to be reactive voltage droop control, that is, the output of reactive power is controlled according to the given droop factor and the grid-connected point voltage reference value.
The specific application examples are as follows:
according to the actual collection condition of a certain wind power plant, a detailed topological structure is established in a PSASP program, the station has 66 fans, and the response characteristics of a single machine in the station and the station can be obtained by simulating the fault of an outgoing line N-1 through electromechanical simulation.
The new energy station level model provided by the application is respectively applied to carry out simulation with the existing single-machine multiplication model of the new energy station and the detailed model of the new energy station, and the response characteristics of the three model structures are contrastively analyzed, so that the result shows that the response characteristics of the new energy station level model provided by the invention and the detailed topological model are closer to each other in the fault recovery stage, and the error is smaller.
The detailed station model is equivalent to 4 machines by comprehensively considering the influence of impedance distribution and power distribution, as shown in fig. 5.
1. Impedance grouping parameters:
TABLE 5-1 impedance grouping parameters
2. The box transformer coefficient:
reactance of the box transformer: and 4 machines are used, so that the box-type transformer R =0.299/66/4=0.01812p.u., and X =2.97/66/4=0.18p.u.
3. Initial power distribution:
and totally 66 2MW units are distributed uniformly, and the unit units are uniformly distributed with uniform power, and the simulation effects of the equivalent models of the following three stations are compared.
(1) Single machine multiplying 132MW (66X 2 MW)
(2) Detailed model 132MW (66X 2 MW)
(3) Station model 132MW (33X 2MW + 33X 2 MW)
4. Fault simulation analysis
And setting N-1 fault disturbance of a wind power plant outgoing alternating current 35kV line.
Comparing the wind power plant under three conditions of a detailed model, a single-machine multiplication model and a station model, the pairs of curves of terminal 690V bus voltage, station outgoing 35kV and 220kV bus voltage, outgoing active power and reactive power are shown in fig. 6 to 10.
Table 5-2 three model alternating current line N-1 fault fan end transient voltage simulation results
Table 5-3 three model alternating current line N-1 fault station 35kV bus transient overvoltage simulation results
Table 5-4 three model alternating current line N-1 fault wind field outgoing 220kV bus transient overvoltage simulation results
It can be seen that the simulation result of the new energy station equivalent model (4 machines) provided by the application is closer to the detailed modeling result, the precision is higher than that of a single-machine multiplication model, and the characteristics of the new energy station can be more accurately reflected. On the premise of ensuring the simulation scale and speed of the power grid, the response characteristic of the new energy station is more accurately and truly embodied. The problem of the requirement of simulation analysis on the new energy station equivalent model is solved.
Based on the same inventive concept, a new energy field station-level modeling practical equivalent device 1100, as shown in fig. 10, includes:
the equivalent structure composition determining unit 1110 is configured to determine the composition of the equivalent structure of the new energy station;
the equivalent unit number determining unit 1120 is used for determining the number of equivalent units in an equivalent model of the new energy station according to the impedance distribution and the power distribution in the equivalent structure;
the equivalent model building unit 1130 is configured to build an equivalent model of the new energy station including the static var compensation apparatus and the equivalent units according to the number of the equivalent units.
Preferably, the composition of the equivalent structure of the new energy station includes:
the equivalent new energy unit, the equivalent box type transformer, the equivalent impedance of the current collection line, the main transformer and the station are controlled in a coordinated mode.
Preferably, the equivalent unit number determining unit includes:
the equivalent unit number n determining subunit is used for determining the equivalent unit number n only considering the impedance distribution in the equivalent structure, wherein n is a positive integer;
an equivalent unit number m determining subunit, configured to determine an equivalent unit number m considering only power distribution in the equivalent structure, where m is a positive integer;
an equivalent unit number N determining subunit, configured to determine, according to the equivalent unit number N of the impedance distribution and the equivalent unit number m of the power distribution, that the equivalent unit number considering both the impedance distribution and the power distribution in the equivalent structure is N, where N is specifically,
N=n*m。
preferably, the method further comprises the following steps: and the control mode determining unit is used for determining the control mode of the equivalent unit, and the control mode is the same as that of the actual new energy unit.
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 the like) 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: although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the spirit and scope of the invention.
Claims (10)
1. A new energy field station-level modeling practical equivalence method is characterized by comprising the following steps:
determining a composition structure of an equivalent unit of the new energy station;
determining the number of equivalent units in an equivalent model of the new energy station according to the impedance distribution characteristics and the power distribution characteristics in the composition structure;
and constructing a new energy station equivalent model comprising a static reactive power compensation device and the equivalent units according to the number of the equivalent units.
2. The method according to claim 1, wherein the structure of the equivalent unit of the new energy station comprises:
the system comprises an equivalent new energy unit, an equivalent box type transformer, equivalent impedance of a current collection line, a main transformer and a field station coordination control unit.
3. The method of claim 1, wherein determining the number of equivalent units in the equivalent model of the new energy site from the impedance and power distribution characteristics in the formation comprises:
determining the number n of equivalent units only considering the impedance distribution characteristics in the composition structure, wherein n is a positive integer;
determining the number m of equivalent units only considering the power distribution characteristics in the composition structure, wherein m is a positive integer;
determining the number of equivalent units considering the impedance distribution characteristics and the power distribution characteristics in the composition structure simultaneously as N according to the number N of equivalent units of the impedance distribution characteristics and the number m of equivalent units of the power distribution characteristics, wherein N is specifically,
N=n*m。
4. the method of claim 3, further comprising:
the values of the equivalent unit number n of the impedance distribution characteristics and the equivalent unit number m of the power distribution characteristics are respectively n belonging to {1, 2} and m belonging to {1, 2};
and determining the value of the equivalent unit number N of the impedance distribution characteristic and the power distribution characteristic as N belonging to {1, 2, 4} according to the values of N and m.
5. The method of claim 4, wherein the value of the equivalent unit number N of the impedance distribution and power distribution characteristics is determined as N ∈ {1, 2, 4} according to the values of N and m, and the method comprises the following steps:
when N and m respectively take values of 1, determining the number N of the equivalent machine sets of the impedance distribution characteristic and the power distribution characteristic as 1 by considering the equivalent machine set 1 of the power distribution characteristic and the equivalent machine set 1 of the impedance distribution characteristic;
when the value of N is 2 and the value of m is 1, determining that the number N of the equivalent machine sets of the impedance distribution characteristic and the power distribution characteristic is 2 by considering the equivalent machine set 2 of the power distribution characteristic and the equivalent machine set 1 of the impedance distribution characteristic;
when the value of N is 1 and the value of m is 2, determining that the number N of the equivalent machine sets of the impedance distribution characteristic and the power distribution characteristic is 2 by considering the equivalent machine set 1 of the power distribution characteristic and the equivalent machine set 2 of the impedance distribution characteristic;
when N and m respectively take values of 2, determining that the number N of the equivalent machine sets of the impedance distribution characteristic and the power distribution characteristic is 4 by considering the equivalent machine set 2 of the power distribution characteristic and the equivalent machine set 2 of the impedance distribution characteristic.
6. The method of claim 1, further comprising: and determining a control mode of the equivalent unit, wherein the control mode is the same as that of the actual new energy unit.
7. A practical equivalence device for new energy field station-level modeling is characterized by comprising:
the equivalent unit determining unit is used for determining the composition structure of the equivalent unit of the new energy station;
the equivalent unit number determining unit is used for determining the number of equivalent units in an equivalent model of the new energy station according to the impedance distribution characteristic and the power distribution characteristic in the composition structure;
and the equivalence model building unit is used for building a new energy station equivalence model comprising the static reactive power compensation device and the equivalence sets according to the number of the equivalence sets.
8. The apparatus according to claim 7, wherein the structure of the equivalent unit of the new energy station comprises:
the system comprises an equivalent new energy unit, an equivalent box type transformer, equivalent impedance of a current collection line, a static reactive compensator, a main transformer and a station coordination control unit.
9. The apparatus of claim 7, wherein the equivalent train number determination unit comprises:
an equivalent unit number n determination subunit, configured to determine an equivalent unit number n that only considers the impedance distribution characteristics in the composition structure, where n is a positive integer;
an equivalent unit number m determining subunit, configured to determine an equivalent unit number m that only considers the power distribution characteristics in the composition structure, where m is a positive integer;
an equivalent unit number N determination subunit configured to determine, according to the equivalent unit number N of the impedance distribution characteristic and the equivalent unit number m of the power distribution characteristic, that the equivalent unit number that simultaneously considers the impedance distribution characteristic and the power distribution characteristic in the constituent structure is N, specifically,
N=n*m。
10. the apparatus of claim 7, further comprising: and the control mode determining unit is used for determining the control mode of the equivalent unit, and the control mode is the same as that of the actual new energy unit.
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