CN115995848A

CN115995848A - Configuration method and system for conventional direct-current island outgoing pure new energy

Info

Publication number: CN115995848A
Application number: CN202210593463.8A
Authority: CN
Inventors: 贺海磊; 秦晓辉; 郭强; 张健; 王继业; 赵珊珊; 张彦涛; 王姗姗; 黄丹; 陆润钊; 孙玉娇; 马丽亚; 王衡
Original assignee: State Grid Corp of China SGCC; China Electric Power Research Institute Co Ltd CEPRI; State Grid Xinjiang Electric Power Co Ltd
Current assignee: State Grid Corp of China SGCC; China Electric Power Research Institute Co Ltd CEPRI; State Grid Xinjiang Electric Power Co Ltd
Priority date: 2022-05-27
Filing date: 2022-05-27
Publication date: 2023-04-21

Abstract

The invention discloses a configuration method and a system for pure new energy sent by a conventional direct current island, wherein the configuration method comprises the following steps: determining the required matched new energy installed capacity, the transmission scheme for connecting the new energy and the direct current, the matched energy storage capacity and the capacity of dynamic adjusting equipment for independently transmitting wind power or photovoltaic by a single conventional direct current; determining the proportion of wind power and photovoltaic with the minimum fluctuation of wind power and photovoltaic mixed output power as a target; determining the energy storage configuration capacity of a single extra-high voltage direct current outgoing pure new energy island system under the optimal wind power and photovoltaic ratio based on the optimal wind power and photovoltaic ratio; and determining the number of outgoing Direct Current (DC) required by the new energy base and the reactive compensation capacity of the whole energy storage and dynamic regulation equipment required by the system based on the single matched new energy installed capacity required by conventional DC for conveying the new energy, the conveying scheme for connecting the new energy and the DC, the matched energy storage capacity, the capacity of the dynamic regulation equipment, the optimal wind power and photovoltaic proportioning scheme and the energy storage configuration capacity.

Description

Configuration method and system for conventional direct-current island outgoing pure new energy

Technical Field

The invention relates to the technical field of power system planning, in particular to a configuration method and a configuration system for conventional direct-current island outgoing pure new energy.

Background

Under the drive of the 'double carbon' target of carbon peak carbon neutralization, china accelerates the construction of a novel electric power system taking new energy as a main body. In the future, new energy is taken as a main body of the power supply, the main body responsibility of the electric quantity and the electric power is borne, and the installation scale of the new energy is greatly increased.

How to collect and send out large-scale new energy is a main problem facing the development of new energy. At present, large-scale new energy is mainly sent out in a centralized way through two kinds of collection forms: one is that the new energy base is gathered and sent out through the alternating current line, such as Zhang Bei-Male ampere extra-high voltage alternating current engineering; the other is that the net-to-net direct current is sent out after being collected by a sending end alternating current system, such as wine lake direct current, heaven direct current and the like. In the two conveying modes, the new energy is deeply coupled with the alternating current power grid and the direct current system, the trend of single fault to cascading failure transition and local fault to global disturbance evolution is presented, and the problems of balance, stability and the like exist in the future along with the gradual expansion of the new energy standard. In addition, a new energy flexible direct current island sending mode can be adopted, such as Zhang Beirou island sending demonstration projects, but equipment manufacturing difficulty is high, manufacturing cost is high, and voltage withstand capacity and overcurrent capacity of a converter valve and switching equipment are limited, so that direct current voltage grade and transmission capacity are limited, and the possibility of large-scale popularization is not provided in a short period.

The large-scale pure new energy island is sent out through the extra-high voltage conventional direct current, so that the balance problem and the stability problem of the new energy base and the main network system can be decoupled, and meanwhile, certain technical economy can be considered. Therefore, research on delivering pure new energy from the conventional direct current island is necessary.

Disclosure of Invention

The invention provides a method and a system for configuring pure new energy sent by a conventional direct-current island, which are used for solving the problem of how to configure the pure new energy sent by the conventional direct-current island.

In order to solve the above problems, according to an aspect of the present invention, there is provided a configuration method for delivering pure new energy from a conventional dc island, the method comprising: determining the new energy installation capacity of a single conventional direct current which is required to independently convey wind power or photovoltaic and is matched with the sleeve, the conveying scheme of connection between the new energy and the direct current, the matched energy storage capacity and the capacity of dynamic regulating equipment based on the historical output of the new energy, the effective capacity coefficient and the equivalent utilization hours;

determining the proportion of wind power and photovoltaic with the minimum fluctuation of wind power and photovoltaic mixed output power as a target; determining the energy storage configuration capacity of a single extra-high voltage direct current outgoing pure new energy island system under the optimal wind power and photovoltaic ratio based on the optimal wind power and photovoltaic ratio, the effective capacity coefficient and the equivalent utilization hours;

And determining the number of outgoing Direct Current (DC) required by the new energy base and the reactive compensation capacity of the whole energy storage and dynamic regulation equipment required by the system based on the single matched new energy installed capacity required by conventional DC for conveying the new energy, the conveying scheme for connecting the new energy and the DC, the matched energy storage capacity, the capacity of the dynamic regulation equipment, the optimal wind power and photovoltaic proportioning scheme and the energy storage configuration capacity.

Preferably, the determining the new energy installation capacity, the transmission scheme of the connection between the new energy and the direct current, the matched energy storage capacity and the capacity of the dynamic adjusting device, which are needed by single conventional direct current to independently transmit wind power or photovoltaic, based on the new energy historical output, the effective capacity coefficient and the equivalent utilization hours, comprises the following steps:

calculating a new energy effective capacity coefficient and an equivalent utilization hour number under the set power rejection rate based on the new energy historical output data;

performing annual electric quantity balance calculation based on the new energy effective capacity coefficient, the equivalent utilization hours, the rated capacity of a single direct current and the annual utilization hours, and determining the new energy installed capacity matched with the extra-high voltage direct current island;

determining a conveying scheme between new energy and direct current, namely the output power of new energy collecting stations, the number of new energy collecting stations contained in the extra-high voltage transformer substation and the number of the extra-high voltage transformer substation;

According to the electric power balance principle, namely that the sum of the generated power of the new energy and the available power of the stored energy is equal to the instantaneous output power of the direct current, the matched energy storage capacity required by single conventional direct current when wind power or photovoltaic is independently transmitted is determined;

and determining the capacity of the dynamic adjusting equipment matched with the direct current circuit according to the system inertia balance requirement, namely that the inertia of the power generation system is equal to that of the direct current system.

Preferably, the calculating the new energy effective capacity coefficient and the equivalent utilization hours at the set power rejection rate based on the new energy historical output data includes:

determining an output sequence P (t) of wind power and photovoltaic power sources at each moment in a preset time period according to the historical output data of the new energy sources;

calculating an effective capacity coefficient lambda under the set power rejection rate gamma according to the output P (t) of the wind power or the photovoltaic power supply at each moment, wherein the effective capacity coefficient lambda comprises the following components:

constraint: />

wherein ,

a cumulative probability distribution function for new energy; f (t) is a sequence obtained by arranging the output P (t) of the wind power or the photovoltaic power supply at each moment in a descending order within a preset time period; the moment corresponding to the effective capacity coefficient lambda is t _λ The method comprises the steps of carrying out a first treatment on the surface of the Gamma is the power rejection rate;

according to the calculated time t corresponding to the effective capacity coefficient lambda of the wind power and the photovoltaic power _λ Calculating annual equivalent utilization time H of wind power and photovoltaic power supply _{Wind power} and H_{Light source} 。

Preferably, the determining the new energy installed capacity matched with the extra-high voltage dc island based on the new energy effective capacity coefficient, the equivalent utilization hours, the rated capacity of the single dc and the annual utilization hours for annual electric quantity balance calculation includes:

wherein ,P_{Wind assembly} and P_{Light assembly} The installed capacities of wind power and photovoltaic are respectively; p (P) _DC Is a direct current capacity; h _DC The time is used for the DC annual time.

Preferably, the determining the connection scheme between the new energy source and the direct current, that is, the outgoing power of the new energy source collecting station, the number of new energy source collecting stations contained in the extra-high voltage transformer substation and the number of extra-high voltage transformer substation, includes:

wherein ,P_{Wind collecting device} and P_{Light converging} The power output from the collecting station is used for independent wind power and photovoltaic transportation; i is 220kV or 330kV, and the access capacity of the pooling station is P _i Is the number of wind farms; j is 220kV or 330kV, and the access capacity of the pooling station is P _j The number of photovoltaic fields of (a); m is M _{Wind power} and M_{Light source} The number of new energy collection stations of the extra-high voltage transformer substation during single wind power or photovoltaic transmission is respectively; k is the number of transformers; p (P) _Tk The capacity of a single transformer of the planned extra-high voltage transformer substation connected with direct current is calculated; u (U) _{Wind power} and U_{Light source} The quantity of the extra-high voltage substations during the transmission of the independent wind power and the photovoltaic power is respectively; p (P) _{Wind assembly} and P_{Light assembly} The installed capacities of wind power and photovoltaic power supply are respectively; lambda (lambda) _{Wind power} and λ_{Light source} The effective capacity coefficients of the independent wind power and photovoltaic power supply are respectively.

Preferably, the determining the energy storage capacity of the matched sleeve required by the single wind power or photovoltaic transmission according to the electric power balance principle, that is, the sum of the generated power of the new energy source and the available power of the stored energy is equal to the direct current instantaneous output power, comprises:

wherein ,P_{Wind reservoir} and P_{Optical storage} The energy storage capacity is matched with the energy storage capacity required by the independent wind power and photovoltaic transportation respectively; p (P) _{Wind assembly} and P_{Light assembly} The installed capacities of wind power and photovoltaic power supply are respectively; lambda (lambda) _{Wind power} and λ_{Light source} The effective capacity coefficients of the independent power supply and the independent photovoltaic power supply are respectively; p (P) _DC Is the DC capacity.

Preferably, the determining the configuration scheme of the dynamic adjustment device matched with the direct current line according to the system inertia requirement includes:

according to the quantity of the centralized cameras and the distributed cameras, distributing the centralized cameras to an extra-high voltage transformer substation and distributing the distributed cameras to a new energy collecting station according to an average principle;

Determining the number of centralized and distributed cameras using equation (8), comprising:

P _DC ×T _dc ＝N _tc ×M _tc ×T _tc +N _td ×M _td ×T _td (8)

wherein ,P_DC Is a direct current capacity; t (T) _dc The equivalent inertia time constant of the new energy direct current output system is calculated; n (N) _tc and N_td The number of the centralized cameras and the number of the distributed cameras are respectively; t (T) _tc and M_tc Time constant and capacity of the centralized camera; t (T) _td and M_td The time constant and capacity of the distributed camera respectively.

Preferably, the determining the ratio of wind power to photovoltaic with the minimum fluctuation of the wind power and photovoltaic mixed output power as the target includes:

and taking the fluctuation sigma of the wind power and photovoltaic mixed output power as a measurement index, and calculating the alpha:beta value corresponding to the minimum sigma as the optimal wind power and photovoltaic ratio.

wherein ,P_W(t) and P_S (t) is the output per unit value of the wind power and the photovoltaic power supply at the moment t respectively; alpha is the proportion of the wind power installation to the wind power and photovoltaic hybrid installation; beta is the proportion of the photovoltaic installation to the wind power and photovoltaic hybrid installation;

the average output per unit value after wind power and photovoltaic are mixed.

Preferably, the determining the energy storage configuration capacity of the single extra-high voltage direct current outgoing pure new energy island system under the optimal wind power and photovoltaic ratio based on the optimal wind power and photovoltaic ratio, the effective capacity coefficient and the equivalent utilization hours comprises the following steps:

According to the optimal delivery ratio of wind power and photovoltaic, annual wind power and photovoltaic output are calculated according to a formula (10).

P'(t)＝αP _W (t)+βP _S (t) (10)

Wherein P' (t) is the mixed output of wind power and photovoltaic at t moment under the optimal proportion;

substituting a new sequence f (t) obtained by arranging P' (t) according to descending order into a formula (1) to calculate an effective capacity coefficient lambda under the optimal ratio of wind power to photovoltaic _{Optimum for the production of a product} The method comprises the steps of carrying out a first treatment on the surface of the Calculating annual equivalent utilization time H under optimal wind power and photovoltaic ratio according to a formula (2) _{Optimum for the production of a product} ；

Determining the energy storage configuration capacity P of a single extra-high voltage direct current outgoing pure new energy island system under the optimal ratio of wind power to photovoltaic according to a formula (11) _C Comprising:

preferably, the determining the number of outgoing direct current required by the new energy base, the integral energy storage required by the system and the passive compensation capacity of the dynamic regulation device based on the capacity of the new energy loader, the transmission scheme, the matched energy storage capacity, the capacity of the dynamic regulation device, the optimal proportioning scheme of wind power and photovoltaic and the energy storage configuration capacity, which are all matched with the single conventional direct current for transmitting new energy, comprises:

calculating the number of direct current strips required by the regular direct current island transportation of the pure new energy according to the installed total capacity of the new energy base, the effective capacity coefficient of the new energy and the equivalent utilization hours;

Determining the reactive compensation capacity of the whole energy storage and dynamic regulation equipment of the new energy required to be configured by the conventional direct current island transmission system according to the number of direct current, the installed proportion of wind power and photovoltaic of the new energy base, the energy storage capacity required to be matched by the single conventional direct current transmission new energy and the capacity of the dynamic regulation equipment;

according to the historical output data of new energy, the installed capacity of new energy, the number of direct current required by pure new energy for carrying out the island transportation of the conventional direct current, the reactive compensation capacity of the integral energy storage and dynamic adjustment equipment required to be configured by the system, and the connection scheme between the new energy and the direct current, BPA simulation data are built, and time sequence production simulation calculation is carried out based on a PSD-PEBL program to obtain a simulation result;

and when the simulation result indicates that the balance constraint of the electric power and the electric quantity is not met, adjusting the energy storage capacity configuration until the balance constraint of the electric power and the electric quantity is met, and outputting the specific configuration setting of the conventional direct current island-out pure new energy.

Preferably, the calculating the number of direct current required by the regular direct current island transportation of the pure new energy based on the installed total capacity of the new energy base, the new energy effective capacity coefficient and the equivalent utilization hours comprises:

If the total capacity of the new energy base installation can directly meet the optimal ratio alpha:beta of wind power and photovoltaic, directly calculating the direct current number L by using a formula (12), wherein the method comprises the following steps:

if the total capacity of the new energy base installation can not directly meet the optimal ratio of wind power to photovoltaic, dividing the new energy installation capacity into two parts, wherein one part is part P meeting the optimal ratio of wind power to photovoltaic _{Fengyou (good wind)} and P_{Optical optimization} The required number of direct current L is calculated by the following formula _{Excellent (excellent)} Comprising:

another part is the residual wind power P _{Surplus of wind} Or photovoltaic P _{Surplus light} The required number L of direct current is determined by using the following formula _{Remainder of the process} Comprising:

at this time, the final DC number L is L _{Excellent (excellent)} and L_{Remainder of the process} And (3) summing.

Preferably, the determining the new energy source according to the number of direct current, the installed proportion of wind power and photovoltaic of the new energy source base, the energy storage capacity required by single conventional direct current to convey the new energy source and the capacity of the dynamic adjusting device, and the power-free compensation capacity of the integral energy storage and dynamic adjusting device required by the conventional direct current island conveying system comprises the following steps:

if the total capacity of the new energy base installation can directly meet the optimal ratio alpha to beta of wind power and photovoltaic, directly calculating the energy storage capacity P matched with each direct current by using a formula (11) _Cl The total energy storage capacity of the system is as follows:

the total capacity of the new energy base installation can not directly meet the optimal ratio of wind power to photovoltaic, and then the total energy storage capacity of the system is as follows:

wherein ,P_{Wind reservoir} and P_{Optical storage} Can be calculated according to formula (7); p (P) _{Mixed storage} Can be calculated according to equation (17).

P _{Mixed storage} ＝(P _{Wind power} +P _{Light source} )λ _Mixing -P _DC (17)

wherein ,P_{Mixed storage} The energy storage capacity required by the direct current mixed transmission is not directly satisfied for the wind power and photovoltaic installed capacity; lambda (lambda) _Mixing Is the effective capacity coefficient in mixed conveying;

and determining the reactive compensation capacity of each direct current matched dynamic regulating device according to the quantity and the capacity of the regulating cameras in the configuration scheme of the direct current circuit matched dynamic regulating device.

Preferably, wherein the method further comprises:

and when the simulation result indicates that the balance constraint of the electric power and the electric quantity is not met, adjusting the energy storage capacity matched with the single wind power or the photovoltaic transmission, and recalculating to enable the simulation result to meet the balance constraint of the electric power and the electric quantity so as to output the configuration of the conventional direct current island to send pure new energy.

According to another aspect of the present invention, there is provided a configuration system for delivering pure new energy from a conventional dc island, the system comprising:

The first calculation unit is used for determining the new energy installed capacity, the conveying scheme, the matched energy storage capacity and the capacity of dynamic regulating equipment, which are matched with the requirement of singly conveying wind power or photovoltaic by a single conventional direct current, based on the historical output of the new energy, the effective capacity coefficient and the equivalent utilization hour;

the second calculation unit is used for determining the proportion of wind power and photovoltaic with the minimum fluctuation of the wind power and photovoltaic mixed output power as a target; determining the energy storage configuration capacity of a single extra-high voltage direct current outgoing pure new energy island system under the optimal wind power and photovoltaic ratio based on the optimal wind power and photovoltaic ratio, the effective capacity coefficient and the equivalent utilization hours;

the configuration determining unit is used for determining the number of outgoing direct current strips required by the new energy base, the integral energy storage required by the system and the reactive compensation capacity of the dynamic regulating equipment based on the single matched new energy installation capacity required by conventional direct current transmission of the new energy, the transmission scheme connected between the new energy and the direct current, the matched energy storage capacity, the capacity of the dynamic regulating equipment, the optimal proportioning scheme of wind power and photovoltaic and the energy storage configuration capacity.

Based on another aspect of the present invention, the present invention provides a computer readable storage medium having stored thereon a computer program which when executed by a processor implements the steps of any one of the configuration methods of a conventional dc island outgoing pure new energy source.

Based on another aspect of the present invention, the present invention provides an electronic device, including:

the computer readable storage medium as described above; and

one or more processors configured to execute the programs in the computer-readable storage medium.

The invention provides a configuration method and a system for pure new energy sent by a conventional direct current island, comprising the following steps: determining the new energy installation capacity required by single conventional direct current for independently conveying wind power or photovoltaic, the conveying scheme for connecting the new energy and the direct current, the matched energy storage capacity and the capacity of dynamic regulating equipment based on the historical output of the new energy, the effective capacity coefficient and the equivalent utilization hours; determining the proportion of wind power and photovoltaic with the minimum fluctuation of wind power and photovoltaic mixed output power as a target; determining the energy storage configuration capacity of a single extra-high voltage direct current outgoing pure new energy island system under the optimal wind power and photovoltaic ratio based on the optimal wind power and photovoltaic ratio, the effective capacity coefficient and the equivalent utilization hours; and determining the number of outgoing direct current required by the new energy base and the reactive compensation capacity of the whole energy storage and dynamic regulation equipment required by the system based on the single matched new energy installed capacity required by conventional direct current for conveying the new energy, the conveying scheme connected between the new energy and the direct current, the matched energy storage capacity, the capacity of the dynamic regulation equipment, the optimal wind power and photovoltaic matching scheme and the energy storage configuration capacity. The method can determine the configuration mode of the ultra-high voltage conventional direct current island transmission system of the large-scale pure new energy, is suitable for an actual large power grid, can ensure that no AC-DC coupling fault occurs when the large-scale pure new energy is transmitted out of the direct current island in the future, is beneficial to system stability, and has great significance in ensuring new energy consumption.

Drawings

Exemplary embodiments of the present invention may be more completely understood in consideration of the following drawings:

FIG. 1 is a flow chart of a configuration 100 for delivering pure new energy from a conventional DC island according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of the logic structure of a standard device according to an embodiment of the present invention;

FIGS. 3 (a) and (b) are a wind annual output curve and a photovoltaic annual output curve, respectively, according to an embodiment of the present invention;

FIGS. 4 (a) and (b) are schematic diagrams of wind power sustained curves and effective capacity coefficients and photovoltaic power sustained curves and effective capacity coefficients, respectively, according to embodiments of the present invention;

fig. 5 is a schematic diagram of a near zone of a conventional dc single-delivery wind power dc converter station according to an embodiment of the invention;

FIG. 6 is a graph of wind power and photovoltaic hybrid annual hour level output according to an embodiment of the present invention;

FIG. 7 is a graph of wind and photovoltaic hybrid annual hour-level output sequenced from large to small in accordance with an embodiment of the present invention;

FIG. 8 is a 8760 hour wind and photovoltaic output and DC output curve according to an embodiment of the present invention;

FIG. 9 is a 8760 hour stored energy output curve according to an embodiment of the present invention;

FIG. 10 is a graph of wind power and photovoltaic power and stored energy operating positions according to an embodiment of the present invention;

fig. 11 is a schematic structural diagram of a configuration system 1100 for delivering pure new energy from a conventional dc island according to an embodiment of the present 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 to fully and completely disclose the present invention and fully convey the scope of the 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, like elements/components are referred to by like reference numerals.

Unless otherwise indicated, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art. In addition, it will be understood that terms 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 chart of a configuration 100 for delivering pure new energy from a conventional dc island according to an embodiment of the present invention. As shown in fig. 1, the configuration method for the conventional direct-current island outgoing pure new energy provided by the embodiment of the invention can determine the configuration mode of the large-scale pure new energy extra-high voltage conventional direct-current island outgoing system, is suitable for an actual large power grid, can ensure that no alternating current-direct current coupling fault occurs in the future large-scale pure new energy through direct-current island outgoing, is beneficial to system stability, and has great significance in ensuring new energy consumption. The configuration method 100 for pure new energy sent by the conventional direct current island provided by the embodiment of the invention starts from step 101, and determines the capacity of a new energy loader, the transmission scheme for connection between new energy and direct current, the matched energy storage capacity and the capacity of dynamic adjustment equipment required by single conventional direct current for independently transmitting wind power or photovoltaic based on the historical output of the new energy, the effective capacity coefficient and the equivalent utilization hours in step 101.

constraint: f (λ) =γ (1)

wherein ,

according to the calculated time t corresponding to the effective capacity coefficient lambda of the wind power and the photovoltaic power _λ Calculating annual equivalent utilization time H of wind power and photovoltaic power supply _{Wind power} and H_{Light source} ；

wherein, the quantity of the centralized camera and the distributed camera is determined by the following method, which comprises the following steps:

P _DC ×T _dc ＝N _tc ×M _tc ×T _tc +N _td ×M _td ×T _td (8)

According to the invention, electric quantity balance calculation is carried out according to a planned single DC capacity PDC, the installation scale of the matched new energy is determined, the matched energy storage capacity required by single wind power or photovoltaic power transmission is determined based on the new energy installation capacity matched with the ultra-high voltage DC island, and meanwhile, the output power of a collecting station, the number of new energy collecting stations of an ultra-high voltage transformer substation and the number of ultra-high voltage transformer substation during single wind power or photovoltaic power transmission are determined.

Specifically, the method comprises the following steps:

(1) And collecting and processing new energy historical data. Historical output data of wind and light resources which are sent out from a new energy base for N years are collected, and an annual wind resource and light resource hourly output sequence P (t) with 8760 hours as a time length is formed according to the following formula.

Wherein P (t) is the output of wind power or photovoltaic at the moment t; n is the total years of statistical sampling of the historical output data of the new energy; p (P) _n And (t) is the per unit value of the output force of wind power or photovoltaic at the time t of the N year.

(2) Computing wind resources and light resourcesThe effective capacity coefficient lambda of (2). Sorting annual wind power and photovoltaic output per unit value (output/installed capacity) P (t) from large to small to form a new sequence f (t); in the (0, lambda) interval, the utilization ratio of the accumulated power generation amount can reach 1-gamma, the calculation formula of the effective capacity coefficient lambda is shown in the following formula, and the constraint is satisfied, and the moment corresponding to the lambda value is t _λ ；

Constraint:

in the formula ,

a cumulative probability distribution function for new energy; gamma is the reject rate.

(3) Calculating the equivalent utilization hours H of wind resources and light resources _{Wind power} or H_{Light source} ：

(4) Determining the planned direct current capacity and the direct current utilization hour number, and calculating the installed capacity of the wind power or photovoltaic power supply matched with the extra-high voltage direct current island, wherein the installed capacity is represented by the following formula:

(5) Determining that the access I capacity of 220kV or 330kV collecting station is P _i Of (1) or J has a capacity of P _j The output power of the wind power or photovoltaic power collection station is as follows:

(6) Determining the capacity P of a single transformer of a planned extra-high voltage substation connected with direct current _Tk And the number K of transformers, the number M of new energy collection stations of the planned extra-high voltage transformer substation is determined according to the N-1 principle:

(7) Determining the number U of the ultra-high voltage substations:

(8) Determining the matched energy storage capacity required for independently conveying wind power or photovoltaic:

wherein ,P_{Wind assembly} and P_{Light assembly} The installed capacities of wind power and photovoltaic are respectively; p (P) _DC Is a direct current capacity; h _DC The DC utilization time is used; h _{Wind power} and H_{Light source} Equivalent utilization time of wind power and photovoltaic power supply respectively; p (P) _{Wind reservoir} and P_{Optical storage} The energy storage capacity is matched with the energy storage capacity required by the independent wind power and photovoltaic transportation respectively; lambda (lambda) _{Wind power} and λ_{Light source} The effective capacity coefficients of the wind power or photovoltaic power supply are respectively and singly transmitted; p (P) _{Wind collecting device} and P_{Light converging} The power output from the collecting station is used for independent wind power and photovoltaic transportation; i is 220kV or 330kV, and the access capacity of the pooling station is P _i Is a number of wind farms; j is 220kV or 330kV, and the access capacity of the pooling station is P _j The number of photovoltaic fields of (a); m is M _{Wind power} and M_{Light source} The number of new energy collection stations of the extra-high voltage transformer substation during single wind power or photovoltaic transportation is respectively; k is the number of transformers; p (P) _Tk The capacity of a single transformer of the planned extra-high voltage transformer substation connected with direct current is calculated; u (U) _{Wind power} and U_{Light source} Respectively, the ultra-high speed during the transmission of the wind power and the photovoltaic powerNumber of transformer substations.

In the invention, the configuration scheme of the dynamic adjusting equipment matched with the direct current circuit is determined according to the inertia requirement.

(1) The dynamic adjusting device commonly used at present is a camera, so that the inertia time constant T of the camera is firstly determined _t Capacity M _t Wherein the time constant of the centralized camera is T _tc Capacity is M _tc The method comprises the steps of carrying out a first treatment on the surface of the Time constant of the distributed camera is T _td Capacity is M _td ；

(2) Determining equivalent inertia time constant T of new energy direct current output system _dc (known);

(3) Determining the number N of cameras _t Wherein the number of the centralized camera is N _tc The time number of the distributed camera is N _td The number of cameras satisfies the constraint as in formula (8), and the number of centralized cameras is determined to be N based on the following formula _tc And the time number of the distributed camera is N _td ；

P _DC ×T _dc ＝N _tc ×M _tc ×T _tc +N _td ×M _td ×T _td (8)

wherein ,P_DC Is a direct current capacity; t (T) _dc The equivalent inertia time constant of the new energy direct current output system is calculated; n (N) _tc and N_td The number of the centralized cameras and the number of the distributed cameras are respectively; t (T) _tc and M_tc Time constant and capacity of the centralized camera; t (T) _td and M_td The time constant and the capacity of the distributed camera;

(4) Distributing the centralized type camera to the ultra-high voltage transformer substation according to an average principle; distributing the distributed cameras to a new energy collection station;

in step 102, determining the proportion of wind power and photovoltaic with the minimum fluctuation of the mixed output power of wind power and photovoltaic as a target; and determining the energy storage configuration capacity of the single extra-high voltage direct current outgoing pure new energy island system under the optimal wind power and photovoltaic ratio based on the optimal wind power and photovoltaic ratio, the effective capacity coefficient and the equivalent utilization hours.

taking the fluctuation sigma of the wind power and photovoltaic mixed output power as a measurement index, and calculating the alpha:beta value corresponding to the minimum sigma as the optimal wind power and light Fu Peibi;

The average output per unit value after wind power and photovoltaic are mixed.

according to the optimal delivery ratio of wind power and photovoltaic, annual wind power and photovoltaic output are calculated according to a formula (10), and the method comprises the following steps:

P'(t)＝αP _W (t)+βP _S (t) (10)

wherein P' (t) is the mixed output of wind power and photovoltaic at t moment under the optimal proportion.

Substituting a new sequence f (t) obtained by arranging P' (t) according to descending order into a formula (1) to calculate an effective capacity coefficient lambda under the optimal ratio of wind power to photovoltaic _{Optimum for the production of a product} The method comprises the steps of carrying out a first treatment on the surface of the Calculating annual equivalent utilization time H under optimal wind power and photovoltaic ratio according to a formula (2) _{Optimum for the production of a product} 。

Determining the energy storage configuration capacity of a single extra-high voltage direct current outgoing pure new energy island system under the optimal ratio of wind power to photovoltaic according to a formula (11)P _C Comprising:

according to the invention, the optimal ratio of wind power and photovoltaic mixed transportation is determined, and the energy storage configuration capacity of the ultra-high voltage direct current end pure new energy island system is determined according to the determined optimal ratio. The method comprises the following specific steps of:

(1) Assuming that the proportion of the wind power installation to the wind power and photovoltaic hybrid installation is alpha, the proportion of the photovoltaic installation to the wind power and photovoltaic hybrid installation is beta, and the proportion of the wind power to the photovoltaic is alpha and beta (alpha+beta=1);

(2) At time t, the per unit value of wind power and photovoltaic output is P respectively _W (t)、P _S (t); according to the minimum fluctuation sigma of the wind power and photovoltaic mixed output power as a measurement index, the calculation formula is as follows:

(3) Changing the values of alpha and beta, and searching for min sigma, wherein the alpha-beta value is the optimal wind power and photovoltaic ratio;

(4) According to the optimal ratio, calculating the per unit value (output/installed capacity) P' (t) of annual wind power and photovoltaic output as shown in a formula (10), sorting the values from large to small to form a new sequence f (t), and calculating the capacity coefficient lambda under the optimal ratio according to the formula (10) _{Optimum for the production of a product} And satisfies the following:

constraint; calculating the utilization hour number H under the optimal proportion according to the formula (4) _{Optimum for the production of a product} 。

P'(t)＝αP _W (t)+βP _S (t) (10)

(5) Determining energy storage configuration capacity P of ultra-high voltage direct current end pure new energy island system under optimal proportion _C Comprising:

wherein, P _W(t) and P_S (t) is the output per unit value of the wind power and the photovoltaic power supply at the moment t respectively; alpha and beta are the proportion of the wind power installation to the wind power and photovoltaic hybrid installation and the proportion of the photovoltaic installation to the wind power and photovoltaic hybrid installation respectively;

the average output per unit value after wind power and photovoltaic are mixed; p (P) _C The energy storage configuration capacity of the pure new energy island system at the ultra-high voltage direct current end is realized under the optimal proportion; p (P) _DC Is a direct current capacity; h _DC The DC utilization time is used; h _{Optimum for the production of a product} The utilization time under the optimal proportion is set; lambda (lambda) _{Optimum for the production of a product} Is the capacity coefficient under the optimal proportion.

In step 103, the number of outgoing direct current strips required by the new energy base, the integral energy storage required by the system and the reactive compensation capacity of the dynamic regulation equipment are determined based on the single conventional direct current to convey the new energy, the matched new energy installed capacity required by the new energy, the conveying scheme connected between the new energy and the direct current, the matched energy storage capacity, the capacity of the dynamic regulation equipment, the optimal proportioning scheme of wind power and photovoltaic and the energy storage configuration capacity.

another part is the residual wind power P _{Surplus of wind} Or photovoltaic P _{Surplus light} Part of (3), utilizeThe required number of direct current L is determined by the following formula _{Remainder of the process} Comprising:

wherein ,P_{Mixed storage} The energy storage capacity required by the direct current mixed transmission is not directly satisfied for the wind power and photovoltaic installed capacity; lambda (lambda) _Mixing Is the effective capacity coefficient in mixed transportation.

According to the new energy scale of the new energy base, the method calculates the number of direct current required by the direct current island to convey the new energy, and determines the initial energy storage and dynamic adjustment equipment configuration capacity of direct current conveyed by the new energy island. Specifically, the method comprises the following steps:

(1) Collecting the installed capacity P of wind power and photovoltaic to be delivered by a new energy base _{Wind assembly} and P_{Light assembly} ；

(2) Judging whether the installed capacity of the new energy directly meets the optimal proportion of wind power and photovoltaic;

(3) If the total capacity of the new energy base installation can directly meet the optimal ratio alpha:beta of wind power and photovoltaic, directly calculating the energy storage capacity P matched with each direct current by using a formula (11) _Cl The total energy storage capacity of the system is as follows:

wherein ,P_{Mixed storage} The energy storage capacity required by the direct current mixed transportation is not directly satisfied for the wind power and the photovoltaic installed capacity; lambda (lambda) _Mixing Is the effective capacity coefficient in mixed transportation.

(4) And determining the reactive compensation capacity of each direct current matched dynamic regulating device according to the quantity and the capacity of the regulating cameras in the configuration scheme of the direct current line matched dynamic regulating device.

According to the invention, time sequence production simulation calculation is carried out according to the data such as the number of direct current strips, energy storage configuration, reactive compensation and the like required by the direct current island to convey new energy, and various detailed configurations of the conventional direct current island-out pure new energy which can meet the balance constraint of electric power and electric quantity and can be applied to engineering practice are determined. Specifically, control:

(1) The method comprises the steps of inputting historical output data of new energy, installed capacity of the new energy, matched energy storage capacity required by single wind power or photovoltaic transmission, direct current number required by direct current island transmission of the new energy, energy storage of direct current transmitted by the new energy island, reactive compensation of dynamic adjusting equipment, energy storage configuration capacity of a pure new energy island system of an ultra-high voltage direct current streaming end under optimal proportion, output power of a collecting station, the number of the new energy collecting station and the number of ultra-high voltage substations during single wind power or photovoltaic transmission, carrying out production simulation calculation by using simulation software PSD-PEBL, and judging whether the system can meet power and electric quantity constraint of 87690H;

(2) If the data can be met, the configuration of the conventional direct current island pure new energy can be carried out according to the current data, and the program is ended; if the energy storage capacity cannot be met, the matched energy storage capacity required by single wind power or photovoltaic transportation in the formula (9) is increased, calculation is carried out again until the requirement is met, and the configuration of the pure new energy sent by the conventional direct current island is carried out according to the current data.

Compared with the prior art, the method has the beneficial effects that:

(1) The configuration method of the conventional direct-current island outgoing pure new energy provided by the invention can determine the construction mode of the large-scale pure new energy extra-high voltage conventional direct-current island outgoing system.

(2) The method provided by the invention can be suitable for an actual large power grid, can ensure that no AC/DC coupling fault occurs when large-scale pure new energy is sent out through a DC island in the future, is beneficial to system stability, and has great significance in ensuring new energy consumption;

(3) The effective capacity coefficients of the wind power and the photovoltaic power supply provided by the invention can effectively estimate the effective capacities of the wind power and the photovoltaic power supply which are not supplied, are beneficial to reasonably designing the schemes of the number of direct current required by new energy transportation, the capacity configuration of energy storage and dynamic regulation equipment, and the like, and have wider application range and high applicability.

The following specifically exemplifies embodiments of the present invention

The wind energy resources in northwest areas are quite abundant, and the solar energy resources also have great development potential, so that the method is the most important new energy base in China, and the calculation adopts a Xinjiang power grid in the northwest power grid as shown in fig. 2 as a research object.

Historical output data of wind and light resources of the new energy base for nearly 3 years is collected to form an annual wind resource and light resource output sequence P (t) per hour, as shown in (a) and (b) of fig. 3.

According to the annual output sequence accumulation curves of the wind power and the photovoltaic of the base, setting the electricity rejection rate gamma to be 5%, and calculating the wind power effective capacity coefficient to be lambda according to a formula _{Wind power} 0.5309 the effective capacity coefficient of the photovoltaic is λ _{Wind power} = 0.6255, as shown in (a) and (b) of fig. 4.

According to the formula (2), the number of air-out resource utilization hours is 2218 hours, and the number of light resource utilization hours is 1415 hours.

According to the formula (3), the annual utilization hours are 5000 hours according to the newly increased direct current 8000MW, and if wind power is transmitted by the direct current, the matched power supply is

If the direct current conveys photovoltaic, the matched power supply is

The single wind power plant has the capacity of 200MW, and one 220kV wind power collection station is considered to collect 3 wind power plants; shan Guangfu power station capacity is 100MW, and a 330kV photovoltaic collecting station considers 10 photovoltaic power stations to collect, and according to formula (4), the wind power collecting station and the photovoltaic collecting station respectively calculate that the outgoing power is 319MW and 626MW.

The capacity of a single transformer of a 750kV transformer substation of a Xinjiang power grid is 1500MW, 3 transformers are arranged in one transformer substation, the matched power output capacity of one 750kV transformer substation is 3000MW according to the consideration that the main transformer N-1 is not overloaded, and according to a formula (5), the maximum of 10 220kV wind power collecting stations and 5 220kV photovoltaic collecting stations are connected. According to formula (6), it is calculated that 3 750kV substations are needed for conveying wind power or photovoltaic, as shown in fig. 5.

According to the formula (7), the energy storage capacity required by direct current transmission of single wind power is 1574MW, 1600MW capacity energy storage is configured, and the charging and discharging working time is 4-6 hours, so that the requirement can be met; the energy storage capacity required by the direct current transmission of single photovoltaic is 9682MW, the 10000MW capacity energy storage is configured, and the charging and discharging working time is 4-6 hours, so that the requirement can be met.

According to investigation, the dynamic adjusting equipment selects a camera, the capacity of the centralized camera is 300Mvar, and the inertia time constant is 3.78 seconds; the capacity of the distributed camera is 50Mvar, and the inertia time constant is 6.24 seconds; the equivalent inertia time constant of the direct current output system is 6 seconds, 8 300Mvar cameras are configured in the direct current convertor station, and 125 50Mvar cameras are configured in the new energy collection station according to the formula (8).

Because the output characteristics of wind power and photovoltaic resources are different, the peak-valley difference of the overall external characteristic of new energy output can be reduced through proportion optimization, and the fluctuation characteristic of the power supply side of the new energy is improved, so that the direct current utilization efficiency is improved, and the matched energy storage investment is reduced.

And adjusting the proportion alpha and beta of the wind power and photovoltaic installation to the wind power and photovoltaic hybrid installation within the range of 10% -90%, and calculating the fluctuation of the wind power and photovoltaic hybrid output according to a formula (9), wherein the result is shown in a table 1.

TABLE 1 Standard deviation of wind Power and photovoltaic different ratio schemes and comprehensive output characteristics

As is clear from the table, the wind power and photovoltaic fluctuation of the embodiment 7 (wind power 70% + photovoltaic power generation 30%) were minimized, and the comprehensive output characteristics of the embodiment were optimized. At this point α:β=7:3.

The annual hourly mixed output of wind power and photovoltaic is shown in figure 6 according to the ratio of wind power to photovoltaic 7:3.

The continuous curve of the generated power is shown in fig. 7 after the annual hour-level output of the wind power and the photovoltaic are mixed and ordered from large to small.

After wind power and photovoltaic are mixed according to the proportion of 7:3, a new sequence which is ordered from big to small is formed according to a formula (10); the effective capacity coefficient corresponding to the considered power rejection rate of 5% was calculated to be 0.454065, and the number of utilization hours was 2167 hours. Calculating the energy storage configuration capacity of the pure new energy island system according to the formula (13) as follows:

The energy storage capacity of 400MW is configured, and the charging and discharging working time is 4-6 hours, so that the requirement can be met.

According to 2060 nationwide new energy technology, capacity resource distribution can be developed, the newly-increased installed capacity in northwest regions is converted into about 5 hundred million kilowatts according to a balanced development strategy, and the future installed capacity of a certain power grid used for calculation is about 8000 ten thousand kilowatts of wind power and 9500 ten thousand kilowatts of photovoltaic.

Calculating 10 direct current strips required by a Xinjiang power grid according to a formula (11), wherein 6 direct currents are required by wind power and photovoltaic mixed transportation according to a ratio of 7:3, and the matched energy storage capacity is 2400MW,4-6 hours/day; the other 4 direct currents independently transmit photovoltaic, and the matched energy storage capacity is 40000MW, and 4-6 hours/day.

According to the data such as the number of direct current, energy storage configuration, reactive compensation and the like required by the transmission of new energy by the direct current island, BPA simulation data are built, production simulation calculation is carried out based on a PSD-PEBL program, and the system can meet the constraint of electric power and electric quantity.

The 8760-hour wind power and photovoltaic output and direct current output curves of the wind power and photovoltaic mixture are shown in fig. 8, and the integral energy storage output curve of the system is shown in fig. 9.

The wind power and photovoltaic power supply and energy storage working position curves calculated on 1 typical day are shown in fig. 10. In fig. 10, the earthy yellow pile-up curve with the ordinate above the zero value is a wind power and photovoltaic real-time power generation curve, and the cyan dash-dot line is a direct current real-time outgoing curve; and the brown accumulation curves with vertical coordinates distributed up and down near the zero value are energy storage working curves, the parts with vertical coordinates larger than zero represent the energy storage working in a discharging state, the horizontal coordinates correspond to the time when the direct current output is larger than the wind power and the photovoltaic output, the parts with vertical coordinates smaller than zero represent the energy storage working in a charging state, and the horizontal coordinates correspond to the time when the direct current output is smaller than the wind power and the photovoltaic output.

According to the method, through electric quantity balance calculation, the installed capacity of single type new energy matched with single direct current is determined; determining the configuration capacity of the dynamic adjusting equipment matched with the direct current through system inertia calculation; determining the optimal energy storage configuration capacity through the optimal mixing ratio of wind power and photovoltaic; and finally, determining the number of direct current transmission and the configuration of each energy storage and dynamic regulation device according to the new energy scale to be transmitted, and determining each detailed configuration which can be finally applied to engineering practice through 8760 hours of electric power and electric quantity balance simulation calculation.

Fig. 11 is a schematic structural diagram of a configuration system 1100 for delivering pure new energy from a conventional dc island according to an embodiment of the present invention. As shown in fig. 11, a configuration system 1100 for delivering pure new energy from a conventional dc island according to an embodiment of the present invention includes: a first calculation unit 1101, a second calculation unit 1102, and a configuration determination unit 1103.

Preferably, the first calculating unit 1101 is configured to determine a new energy installed capacity required by single conventional direct current to separately transmit wind power or photovoltaic, a transmission scheme for connecting the new energy and the direct current, a matched energy storage capacity, and a capacity of a dynamic adjustment device based on a new energy historical output, an effective capacity coefficient, and an equivalent utilization hour;

Preferably, the second calculating unit 1102 is configured to determine a ratio of wind power to photovoltaic with a goal of minimum fluctuation of a power of mixed wind power and photovoltaic; determining the energy storage configuration capacity of a single extra-high voltage direct current outgoing pure new energy island system under the optimal wind power and photovoltaic ratio based on the optimal wind power and photovoltaic ratio, the effective capacity coefficient and the equivalent utilization hours;

preferably, the configuration determining unit 1103 is configured to determine the number of outgoing direct current required by the new energy base, the total energy storage required by the system and the reactive compensation capacity of the dynamic adjustment device based on the single normal direct current, the required new energy installation capacity of the new energy, the transmission scheme of the connection between the new energy and the direct current, the required energy storage capacity of the new energy, the capacity of the dynamic adjustment device, the optimal matching scheme of wind power and photovoltaic, and the energy storage configuration capacity.

The configuration system 1100 for delivering pure new energy from a conventional dc island according to the embodiment of the present invention corresponds to the configuration method 100 for delivering pure new energy from a conventional dc island according to another embodiment of the present invention, and is not described herein.

The present invention provides a computer readable storage medium having stored thereon a computer program which when executed by a processor implements the steps of any one of the configuration methods of a conventional direct current island outgoing pure new energy.

The present invention provides an electronic device including: the computer readable storage medium as described above; and one or more processors configured to execute the program in the computer-readable storage medium.

The invention has been described with reference to a few embodiments. However, as is well known to those skilled in the art, other embodiments than the above disclosed invention are equally possible within the scope of the invention, as defined by 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 therein. All references to "a/an/the [ means, component, etc. ]" are to be interpreted openly as referring to at least one instance of said means, 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.

It will be appreciated by those skilled in the art that 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, etc.) 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 flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations 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 solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the above embodiments, it should be understood by those of ordinary skill in the art that: modifications and equivalents may be made to the specific embodiments of the invention without departing from the spirit and scope of the invention, which is intended to be covered by the claims.

Claims

1. The configuration method for transmitting pure new energy from a conventional direct current island is characterized by comprising the following steps of:

determining the new energy installation capacity required by single conventional direct current for independently conveying wind power or photovoltaic, the conveying scheme for connecting the new energy and the direct current, the matched energy storage capacity and the capacity of dynamic regulating equipment based on the historical output of the new energy, the effective capacity coefficient and the equivalent utilization hours;

2. The method of claim 1, wherein determining a new energy installation capacity of a single conventional direct current required for separately delivering wind power or photovoltaic, a delivery scheme for connection between the new energy and the direct current, a matched energy storage capacity, and a capacity of a dynamic adjustment device based on the new energy historical output, the effective capacity coefficient, and the equivalent utilization hours comprises:

determining a conveying scheme between new energy and direct current, namely the output power of the new energy collecting stations, the number of the new energy collecting stations contained in the extra-high voltage transformer substation and the number of the extra-high voltage transformer substation;

according to the electric power balance principle, namely that the sum of the generated power of the new energy and the available power of the stored energy is equal to the direct current instantaneous output power, the matched energy storage capacity required by single conventional direct current when wind power or photovoltaic is independently conveyed is determined;

3. The method of claim 2, wherein calculating the new energy effective capacity coefficient and the equivalent number of hours of utilization at the set power rejection rate based on the new energy historical output data comprises:

wherein ,

4. The method according to claim 2, wherein the determining the new energy installed capacity matched with the extra-high voltage dc island based on the new energy effective capacity coefficient, the equivalent utilization hours, the rated capacity of the single dc, and the annual utilization hours for annual power balance calculation includes:

5. The method according to claim 2, wherein determining the connection scheme between the new energy source and the direct current, that is, the outgoing power of the new energy source collecting station, the number of new energy source collecting stations included in the extra-high voltage transformer station, and the number of extra-high voltage transformer stations, includes:

wherein ,P_{Wind collecting device} and P_{Light converging} The power output from the collecting station is used for independent wind power and photovoltaic transportation; i is 220kV or 330kV, and the access capacity of the pooling station is P _i Is the number of wind farms; j is220kV or 330kV collecting station access capacity is P _j The number of photovoltaic fields of (a); m is M _{Wind power} and M_{Light source} The number of new energy collection stations of the extra-high voltage transformer substation during single wind power or photovoltaic transportation is respectively; k is the number of transformers; p (P) _Tk The capacity of a single transformer of the planned extra-high voltage transformer substation connected with direct current is calculated; u (U) _{Wind power} and U_{Light source} The quantity of the extra-high voltage substations during the transmission of the independent wind power and the photovoltaic power is respectively; p (P) _{Wind assembly} and P_{Light assembly} The installed capacities of wind power and photovoltaic power supply are respectively; lambda (lambda) _{Wind power} and λ_{Light source} The effective capacity coefficients of the independent wind power and photovoltaic power supply are respectively.

6. The method according to claim 2, wherein determining the required matching energy storage capacity for the individual wind power or photovoltaic transportation according to the electric power balance principle, that is, the sum of the generated power of the new energy source and the available power of the stored energy is equal to the direct current instantaneous output power, comprises:

wherein ,P_{Wind reservoir} and P_{Optical storage} The energy storage capacity is matched with the energy storage capacity required by the independent wind power and photovoltaic transportation respectively; p (P) _{Wind assembly} and P_{Light assembly} The installed capacities of wind power and photovoltaic power supply are respectively; lambda (lambda) _{Wind power} and λ_{Light source} The effective capacity coefficients of the wind power or photovoltaic power supply are respectively and independently conveyed; p (P) _DC Is the DC capacity.

7. The method according to claim 2, wherein determining the configuration scheme of the dynamic adjustment device for the dc link according to the system inertia requirement includes:

according to the quantity of the centralized cameras and the distributed cameras, distributing the centralized cameras to an extra-high voltage transformer substation and distributing the distributed cameras to a new energy collecting station according to an average principle; the number of centralized and distributed cameras is determined using equation (8).

P _DC ×T _dc ＝N _tc ×M _tc ×T _tc +N _td ×M _td ×T _td (8)

wherein ,P_DC Is a direct current capacity; t (T) _dc The equivalent inertia time constant of the new energy direct current output system; n (N) _tc and N_td The number of the centralized cameras and the number of the distributed cameras are respectively; t (T) _tc and M_tc Time constant and capacity of the centralized camera; t (T) _td and M_td The time constant and capacity of the distributed camera respectively.

8. The method of claim 1, wherein determining the ratio of wind power to photovoltaic that targets a minimum fluctuation in wind power to photovoltaic hybrid output power comprises:

the average output per unit value after wind power and photovoltaic are mixed.

9. The method of claim 1, wherein determining the energy storage configuration capacity of the single extra-high voltage direct current outgoing pure new energy island system under the optimal wind power and photovoltaic ratio based on the optimal wind power and photovoltaic ratio, the effective capacity coefficient and the equivalent utilization hours comprises:

according to the optimal delivery ratio of wind power and photovoltaic, annual wind power and photovoltaic output are calculated according to a formula (10)

P'(t)＝αP _W (t)+βP _S (t) (10)

Wherein P' (t) is the mixed output of wind power and photovoltaic at t moment under the optimal ratio;

10. the method according to claim 1, wherein determining the number of outgoing direct current required by the new energy base, the total energy storage required by the system and the reactive compensation capacity of the dynamic adjustment device based on the single conventional direct current required by the new energy to be delivered, the delivery scheme of the connection between the new energy and the direct current, the matched energy storage capacity, the capacity of the dynamic adjustment device, and the optimal proportioning scheme and the energy storage configuration capacity of the wind power and photovoltaic, comprises:

determining the reactive compensation capacity of the whole energy storage and dynamic regulation equipment required to be configured by the new energy regular DC island conveying system according to the number of the direct current, the installed proportion of wind power and photovoltaic of the new energy base, the energy storage capacity required by single regular DC conveying new energy and the capacity of the dynamic regulation equipment;

according to the historical output data of new energy, the installed capacity of new energy, the number of direct current required by pure new energy for regular direct current island transmission, the reactive compensation capacity of integral energy storage and dynamic regulation equipment required by a system, and a connection scheme between the new energy and direct current, BPA simulation data are built, and time sequence production simulation calculation is carried out based on a PSD-PEBL program to obtain a simulation result;

And when the simulation result indicates that the balance constraint of the electric power and the electric quantity is not met, adjusting the energy storage capacity configuration until the balance constraint of the electric power and the electric quantity is met, and outputting the specific configuration setting of the pure new energy sent by the conventional direct current island.

11. The method of claim 10, wherein calculating the number of direct current lines required for regular direct current island delivery of pure new energy based on the installed total capacity of the new energy base, the new energy effective capacity coefficient, and the equivalent utilization hours comprises:

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12. The method according to claim 10, wherein determining the reactive compensation capacity of the integrated energy storage and dynamic adjustment device of the new energy source required to be configured by the conventional dc island transmission system according to the number of the direct current, the installed ratio of wind power to photovoltaic of the new energy source base, the energy storage capacity required to be matched by the single conventional dc transmission new energy source, and the capacity of the dynamic adjustment device comprises:

if the total capacity of the new energy base installation can directly meet the optimal ratio alpha:beta of wind power and photovoltaic, directly calculating the energy storage capacity P matched with each direct current by using a formula (11) _Cl The total energy storage capacity of the system is as follows:

the total capacity of the new energy base installation can not directly meet the optimal ratio of wind power to photovoltaic, and the total energy storage capacity of the system is as follows:

wherein ,P_{Mixed storage} The energy storage capacity required by the direct current mixed transportation is not directly satisfied for the wind power and the photovoltaic installed capacity; lambda (lambda) _Mixing Is the effective capacity coefficient in mixed conveying;

and determining the reactive compensation capacity of each direct current matched dynamic regulating device according to the quantity and the capacity of the regulating cameras in the configuration scheme of the direct current line matched dynamic regulating device.

13. A configuration system for delivering pure new energy from a conventional direct current island, the system comprising:

14. A computer readable storage medium, on which a computer program is stored, characterized in that the program, when being executed by a processor, implements the steps of the method according to any of claims 1-12.

15. An electronic device, comprising:

the computer readable storage medium recited in claim 14; and