CN106655268A - Comprehensive benefit analysis method and device for distributed photovoltaic access - Google Patents

Abstract

The invention provides a comprehensive benefit analysis method and device for distributed photovoltaic access. The method comprises the steps of determining a power distribution parameter after distributed photovoltaic power distribution network access according to planning information of the distributed photovoltaic power distribution network access; calculating steady-state power flow one by one point in time within a preset time frame of the power distribution parameter, and determining electricity limiting quantity of each time point according to the steady-state power flow of each time point; judging whether the sum of electricity limiting quantities of all time points is larger than a preset value or not; calculating cost and benefit which are brought by the distributed photovoltaic power distribution network access when the sum of the electricity limiting quantities of all time points is smaller than or equal to the preset value; and determining comprehensive benefit of the distributed photovoltaic power distribution network access according to the cost and the benefit which are brought by the distributed photovoltaic the power distribution network access. By the method, the annual comprehensive benefit of the distributed photovoltaic the power distribution network access can be determined according to the planning information of the distributed photovoltaic the power distribution network access and annual 8,760-hour network running state, so that a scientific basis can be provided for distributed photovoltaic optimization and planning.

Description

A comprehensive benefit analysis method and device for distributed photovoltaic access

technical field

The invention relates to the field of electric power technology, in particular to a comprehensive benefit analysis method and device for distributed photovoltaic access.

Background technique

With the development of the national economy, the demand for electric power increases rapidly, people pay more attention to environmental issues and the requirements for reliability of power supply continue to increase. The nearby access of distributed photovoltaics and direct power supply to users are conducive to reducing transmission and distribution losses, delaying grid investment, improving power supply reliability, promoting economic development, energy conservation and emission reduction, and have good economic and social benefits.

However, the development and construction of distributed photovoltaics requires a large initial investment. At the same time, the high penetration rate connected to the grid may also bring grid transformation costs and power rationing losses. Therefore, there is an urgent need for a method that can comprehensively evaluate the comprehensive benefits of distributed photovoltaics connected to the distribution network, so that the comprehensive benefits of distributed photovoltaics connected to the distribution network can provide a scientific basis for distributed photovoltaic optimization planning.

Contents of the invention

In view of this, the present invention provides a comprehensive benefit analysis method and device for distributed photovoltaic access. The method includes:

Based on the planning information of the distributed photovoltaic access to the distribution network, determine the power distribution parameters after the distributed photovoltaic is connected to the distribution network;

Based on the power distribution parameters, the steady-state power flow is calculated point by time within the preset time period, and the power limit at each time point is determined based on the steady-state power flow at each time point, and the adjacent time within the preset time period The time interval of the points is the same;

Determine whether the sum of the power limit at all time points is greater than the preset value;

When the sum of the limited power at all time points is less than or equal to the preset value, calculate the cost and benefit brought by the distributed photovoltaic access to the distribution network;

The comprehensive benefits of connecting the distributed photovoltaics to the distribution network are determined based on the cost and benefits of the distributed photovoltaics connecting to the distribution network.

The method also includes:

When the sum of the limited power at all time points is greater than the preset value, determine the transformation strategy of the distribution network, and adjust the power distribution parameters of the distribution network based on the transformation strategy, and then return to the The step of calculating the steady-state power flow point by point within a preset time period based on the power distribution parameters.

Wherein, the calculation of the cost and the benefits brought by the distributed photovoltaic access to the distribution network includes:

Calculate the initial investment cost, power grid transformation cost, maintenance cost and power limit loss of the distributed photovoltaic access to the distribution network, and calculate the initial investment cost, the power grid transformation cost, the maintenance cost and the power limit The sum of the electricity loss is used as the cost of connecting the distributed photovoltaic to the distribution network;

Calculate the expected electricity sales income, delay system investment income, reduce system loss income, energy saving benefits, environmental benefits, expected electricity sales income and reliability income brought by the distributed photovoltaic access to the distribution network, and calculate the The sum of the expected electricity sales income, the delayed system investment income, the reduced system loss income, the energy saving benefits, the environmental benefits, the expected electricity sales income and the reliability income is used as the distributed photovoltaic Benefits from being connected to the distribution network.

Wherein, the determination of the limited power at each time point based on the steady-state power flow at each time point includes:

Determine the power supply parameters at each time point based on the steady-state power flow at each time point;

Judging whether the power supply parameter at each time point exceeds the preset power supply value, and when the power supply parameter exceeds the preset power supply value, perform power limit according to the preset power limit strategy;

Acquiring the power limit at the time point when the power supply parameter exceeds the preset power supply value.

Wherein, the calculation of the steady-state power flow based on the power distribution parameters and time points within a preset time period includes:

Steady state power flow is calculated hourly over 8760 hours of the year based on the distribution parameters.

A comprehensive benefit analysis device for distributed photovoltaic access, the device includes: a power distribution parameter determination module, a steady-state power flow calculation module, a power limit determination module, a judgment module, a cost and income calculation module, and a comprehensive benefit calculation module;

The power distribution parameter determination module is configured to determine the power distribution parameters after the distributed photovoltaics are connected to the distribution network based on the planning information of the distributed photovoltaics connected to the distribution network;

The steady-state power flow calculation module is used to calculate the steady-state power flow point by point within a preset time period based on the power distribution parameters;

The power limit determination module is configured to determine the power limit at each time point based on the steady-state power flow at each time point, and the time intervals between adjacent time points within the preset time period are the same;

The judging module is used to judge whether the sum of the limited power at all time points is greater than a preset value;

The cost and benefit calculation module is used to calculate the cost and result of the distributed photovoltaic accessing the distribution network when the sum of the limited power at all time points is less than or equal to the preset value income;

The comprehensive benefit calculation module is configured to determine the comprehensive benefit of the distributed photovoltaic connected to the distribution network based on the costs and benefits brought by the distributed photovoltaic connected to the distribution network.

The device also includes:

A retrofit strategy determination module, configured to determine a retrofit strategy for the distribution network when the sum of the limited power at all time points is greater than the preset value;

A power distribution parameter adjustment module, configured to adjust the power distribution parameters of the distribution network based on the transformation strategy, and then trigger the power distribution parameter determination module to calculate the steady status trend.

Wherein, the cost and benefit calculation module includes: a cost calculation sub-module and a benefit calculation sub-module;

The cost calculation sub-module is used to calculate the initial investment cost, power grid transformation cost, maintenance cost and power limitation loss of the distributed photovoltaic connected to the distribution network, and calculate the initial investment cost and the power grid transformation cost , the sum of the maintenance cost and the power limitation loss is used as the cost of connecting the distributed photovoltaic to the distribution network;

The income calculation sub-module is used to calculate the expected electricity sales income brought by the distributed photovoltaic access to the distribution network, delaying system investment income, reducing system loss income, energy saving benefits, environmental benefits, expected sales electricity income and reliability income, and calculate the sum of the delayed system investment income, the system loss reduction income, the energy saving benefit, the environmental income, the expected electricity sales income and the reliability income as the The benefits brought by distributed photovoltaic access to the distribution network.

Wherein, the power limit determination module includes: a power supply parameter calculation submodule, a judgment submodule, an electronic limit module and an acquisition submodule;

The power supply parameter calculation submodule is used to determine the power supply parameters at each time point based on the steady-state power flow at each time point;

The judging submodule is used to judge whether the power supply parameter at each time point exceeds a preset power supply value;

The limiting electronic module is configured to limit power according to a preset power limiting strategy when the power supply parameter exceeds the preset power supply value;

The acquisition sub-module is configured to acquire the limited power at the time point when the power supply parameter exceeds a preset power supply value.

Wherein, the steady-state power flow calculation module is specifically used to calculate the steady-state power flow hour by hour within 8760 hours of the year based on the power distribution parameters.

The above technical scheme has the following beneficial effects:

The comprehensive benefit analysis method and device for distributed photovoltaic access provided by the present invention can determine the power distribution parameters after distributed photovoltaic access to the distribution network based on the planning information of distributed photovoltaic access to the distribution network, and then based on the power distribution The parameter calculates the steady-state power flow point by time within the preset time period, and determines the power limit at each time point based on the steady-state power flow at each time point. When the sum of the power limit at all time points is less than or equal to the preset value When calculating the cost and benefits brought by distributed photovoltaic access to the distribution network, and based on the costs and benefits brought by distributed photovoltaic access to the distribution network, determine the comprehensive benefits of distributed photovoltaic access to the distribution network . It can be seen that the comprehensive benefit analysis method and device for distributed photovoltaic access provided by the present invention can determine the comprehensive benefits of distributed photovoltaic access to distribution network based on the planning information of distributed photovoltaic access to distribution network, so as to provide Distributed photovoltaic optimization planning provides a scientific basis.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only It is an embodiment of the present invention, and those skilled in the art can also obtain other drawings according to the provided drawings without creative work.

Fig. 1 is a schematic flowchart of a comprehensive benefit analysis method for distributed photovoltaic access provided by an embodiment of the present invention;

Fig. 2 is another schematic flowchart of the comprehensive benefit analysis method for distributed photovoltaic access provided by the embodiment of the present invention;

Fig. 3 is a schematic structural diagram of a comprehensive benefit analysis device for distributed photovoltaic access provided by an embodiment of the present invention.

detailed description

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

An embodiment of the present invention provides a comprehensive benefit analysis method for distributed photovoltaic access, please refer to Figure 1, which shows a schematic flow chart of the method, which may include:

Step S101: Based on the planning information of distributed photovoltaics connecting to the distribution network, determine the power distribution parameters after the distributed photovoltaics are connected to the distribution network.

Step S102: Calculating the steady state power flow based on the power distribution parameters time point by time point within the preset time period, and determining the curtailed power at each time point based on the steady state power flow at each time point.

Wherein, the time intervals between adjacent time points within the preset time period are the same.

Step S103: Determine whether the sum of the limited power at all time points is greater than a preset value.

Step S104: When the sum of the limited power at all time points is less than or equal to the preset value, calculate the cost and benefit brought by the access of distributed photovoltaics to the distribution network.

Step S105: Determine the comprehensive benefits of distributed photovoltaics connected to the distribution network based on the costs and benefits brought about by the distributed photovoltaics connected to the distribution network.

The comprehensive benefit analysis method for distributed photovoltaic access provided by the embodiment of the present invention can determine the distribution parameters after distributed photovoltaic access to the distribution network based on the planning information of distributed photovoltaic access to the distribution network, and then based on the distribution The parameter calculates the steady-state power flow point by time within the preset time period, and determines the power limit at each time point based on the steady-state power flow at each time point. When the sum of the power limit at all time points is less than or equal to the preset value When calculating the cost and benefits brought by distributed photovoltaic access to the distribution network, and based on the costs and benefits brought by distributed photovoltaic access to the distribution network, determine the comprehensive benefits of distributed photovoltaic access to the distribution network . It can be seen that the comprehensive benefit analysis method of distributed photovoltaic access provided by the embodiment of the present invention can determine the comprehensive benefits of distributed photovoltaic access to distribution network based on the planning information of distributed photovoltaic access to distribution network, so as to provide Distributed photovoltaic optimization planning provides a scientific basis.

Please refer to FIG. 2 , which shows another schematic flowchart of the comprehensive benefit analysis method for distributed photovoltaic access provided by the embodiment of the present invention. The method may include:

Step S201: Based on the planning information of distributed photovoltaics connecting to the distribution network, determine the power distribution parameters after the distributed photovoltaics are connected to the distribution network.

Among them, distribution network parameters include technical parameters and economic parameters. Technical parameters can include distributed photovoltaic installed capacity, technology type, output characteristics, network structure of distributed photovoltaic connected to the grid, network parameters such as line transformers, user load distribution and load characteristics, etc. Economic parameters can include user-side and grid-side network connection costs under various access methods, price parameters of grid equipment, time-of-use electricity prices for curtailed power, and implementation costs of various grid operation strategies.

Step S202: Calculating the steady state power flow based on the power distribution parameters time point by time point within the preset time period, and determining the curtailed power at each time point based on the steady state power flow at each time point.

Wherein, the time intervals between adjacent time points within the preset time period are the same.

In this embodiment, considering that various cost benefits are related to the annual operation status of the power grid, the preset time period may be 8760 hours per year, and the steady-state power flow may be calculated hour by hour based on power distribution parameters within 8760 hours per year.

Wherein, based on the steady-state power flow at each time point, determining the curtailed power at each time point includes: determining the power supply parameters at each time point based on the steady-state power flow at each time point (such as the power supply parameters of each node in the distribution network power supply voltage and current); judge whether the power supply parameters at each time point exceed the preset power supply value, and when the power supply parameters exceed the preset power supply value (which can be the power supply voltage and line transmission capacity specified by the national standard), according to the preset The power limit strategy is used to limit power; obtain the power limit at the point in time when the power supply parameter exceeds the preset power supply value.

Step S203: Determine whether the sum of the limited power at all time points is greater than a preset value.

Step S204a: When the sum of the limited power at all time points is less than or equal to the preset value, calculate the cost and benefit brought by the access of distributed photovoltaics to the distribution network.

Step S204b: When the sum of the limited power at all time points is greater than the preset value, determine the transformation strategy of the distribution network, adjust the distribution parameters of the distribution network based on the transformation strategy, and use the adjusted distribution parameters as the new distribution network. electrical parameters, and then return to step S202.

Step S205b: Based on the costs and benefits brought by the distributed photovoltaic access to the distribution network, determine the comprehensive benefits of the distributed photovoltaic access to the distribution network.

The comprehensive benefit analysis method for distributed photovoltaic access provided by the present invention can determine the distribution parameters after distributed photovoltaic access to the distribution network based on the planning information of distributed photovoltaic access to the distribution network, and then based on the distribution parameters in the Calculate the steady-state power flow point by time within the preset time period, and determine the power limit at each time point based on the steady-state power flow at each time point. When the sum of the power limit at all time points is less than or equal to the preset value, Calculate the cost and benefits of distributed photovoltaic access to the distribution network, and then determine the comprehensive benefits of distributed photovoltaic access to the distribution network based on the costs and benefits of distributed photovoltaic access to the distribution network, and when all When the sum of the limited power at the time point is greater than the preset value, the power distribution parameters can be adjusted, so as to determine the comprehensive benefits of the distribution network based on the new power distribution parameters. It can be seen that the comprehensive benefit analysis method of distributed photovoltaic access provided by the present invention can determine the distributed photovoltaic access distribution network based on the planning information of distributed photovoltaic access distribution network and the annual 8760-hour network operation status. The annual comprehensive benefits can provide a scientific basis for distributed photovoltaic optimization planning.

In any of the above-mentioned embodiments, the calculation of the cost and benefit brought by the distributed photovoltaic access to the distribution network includes: calculation of the initial investment cost of the distributed photovoltaic access to the distribution network, grid transformation costs, maintenance costs and power rationing Loss; Calculate the expected income from electricity sales brought by distributed photovoltaic access to the distribution network, delay system investment income, reduce system loss income, energy saving benefits, environmental benefits, expected electricity sales income and reliability income.

Among them, the initial investment cost of distributed photovoltaic access to the distribution network is calculated based on the installed capacity and unit installed capacity cost. Specifically, the initial investment cost C _g is calculated by the following formula:

In the formula, is the unit installed capacity cost of distributed photovoltaic power generation i, P _i is the installed capacity of distributed photovoltaic power generation i, and n is the quantity of distributed photovoltaic power generation.

Among them, the power grid transformation cost caused by distributed photovoltaic access to the distribution network is calculated by the length of the line to be transformed and the cost per unit length of the line to be transformed:

In the formula, is the cost per unit length of line i, L _i is the length of line i, R _i indicates whether line i needs to be remodeled, and it is 1 if it needs to be rebuilt, and 0 if it is not rebuilt, and m is the number of lines in the network.

Among them, the maintenance cost of distributed photovoltaic access to the distribution network is calculated according to the capacity, and the maintenance cost of the transformed grid equipment is estimated according to a specific proportion of the transformation cost:

In the formula, is the unit capacity maintenance cost of distributed photovoltaic i; P _i is the installed capacity of distributed photovoltaic i; K _r is the proportional coefficient of grid equipment maintenance cost to transformation cost.

Among them, the power limit loss of distributed photovoltaic is calculated based on the power limit and unit power value at each time point. Specifically, the power limit loss of distributed photovoltaic is calculated by the following formula:

In the formula, E _i,t is the curtailment of distributed photovoltaic power generation i at time t; C _E is the value of unit curtailment.

Among them, the benefits of reducing system losses brought about by the distributed photovoltaic access to the distribution network are closely related to the grid structure and operation mode, load conditions, and the location, capacity and operation mode of distributed photovoltaics. The time period for the hypothetical analysis is defined as annual 8760 hours, then the benefit of reducing system loss is calculated by the following formula:

In the formula, E _basisloss is the system base loss when there is no distributed photovoltaic access; r _i is the unit length impedance of the i-th line; l _i is the unit-length impedance of the i-th line; U _i,t is the i-th line The voltage of the line at time t; P _i,t is the active power flowing through the i-th line at time t; Q _i,t is the reactive power flowing through the i-th line at time t; C _E is the value of unit power consumption, and The value of the unit power limit.

Among them, the delayed investment benefit of distributed photovoltaic access to the distribution network is calculated based on the reduction value of the maximum demand of network transformers after distributed photovoltaic access and the grid power investment cost required for unit demand. Specifically, the delayed investment benefit is calculated by The following formula is calculated:

B _inv ＝(P _basis -P _{max T} )·C _kw (6)

In the formula, P _basis is the maximum power supply power of the transformer without distributed photovoltaic access; P _{max T} is the maximum power supply power of the transformer after distributed photovoltaic access; C _kw is the grid power investment cost required to meet the unit power supply power of the transformer .

Among them, the energy-saving benefits of distributed photovoltaics are calculated based on the actual power generation and the cost of reduced coal consumption per unit of power generation. Specifically, the energy-saving benefits of distributed photovoltaics are calculated by the following formula:

In the formula, M _kwh is the amount of coal consumed by coal-fired thermal power units to produce unit electricity; C _kwh is the price of unit coal; n is the number of distributed photovoltaics; E _i,t is the power generation of distributed photovoltaic i at time t .

Among them, the environmental benefits brought by the distributed photovoltaic access to the distribution network are calculated based on the number of pollutants discharged, the emission coefficient of each pollutant, and the treatment cost coefficient of each pollutant. Specifically, the distributed photovoltaic access The resulting environmental benefits are calculated by the following formula:

In the formula, X is the number of discharged pollutants; Po _k is the discharge coefficient of the kth pollutant; c _k is the pollutant treatment cost coefficient.

Among them, the expected income from electricity sales mainly refers to the expected income from the electricity generated by distributed power generation, which is a relatively fixed value. The difference from the actual power generation mainly lies in the loss of power restriction, which is specifically related to the power generation capacity and operation mode of distributed power generation. , where the operation mode mainly refers to the full online and self-use mode. Specifically, the expected income from electricity sales for full online is

In the formula, C _SPi and C _BPi are the on-grid electricity price and policy-subsidized electricity price of distributed photovoltaic i at time t, respectively.

Among them, the reliability benefits brought by distributed photovoltaics connected to the distribution network refer to the distributed photovoltaics avoiding the loss of power outages of users, which can be calculated by the following formula:

B _secu = E _PV C (10)

In the formula, EP _PV is the distributed photovoltaic power generation, and C is the power production ratio, which refers to the ratio of the gross domestic product (GDP) to the electric energy used in a certain stage and in a certain region, yuan/kWh.

In this embodiment, the net present value method is used to analyze the comprehensive economic benefits of distributed photovoltaic access, based on the initial investment cost C _g , grid transformation cost C _r caused by distributed photovoltaic access, maintenance cost C _om , Electricity loss C _c , delaying system investment income B _inv , reducing system loss income B _loss , energy saving benefit B _energy , environmental benefit B environment , expected electricity _sale income B _sell and reliability income B _secu , use the following formula to calculate distributed photovoltaic connection The comprehensive benefit of input:

Corresponding to the above method, the embodiment of the present invention also provides a comprehensive benefit analysis device for distributed photovoltaic access, please refer to Figure 3, which shows a schematic structural diagram of the device, which may include: a power distribution parameter determination module 301, Steady-state power flow calculation module 302 , power limit determination module 303 , judgment module 304 , cost and benefit calculation module 305 and comprehensive benefit calculation module 306 . in:

The power distribution parameter determination module 301 is configured to determine the power distribution parameters after the distributed photovoltaics are connected to the distribution network based on the planning information of the distributed photovoltaics connected to the distribution network.

The steady-state power flow calculation module 302 is configured to calculate the steady-state power flow point-by-time within a preset time period based on power distribution parameters.

The power limit determination module 303 is configured to determine the power limit at each time point based on the steady-state power flow at each time point, and the time interval between adjacent time points within a preset time period is the same.

A judging module 304, configured to judge whether the sum of the limited power at all time points is greater than a preset value.

The cost and benefit calculation module 305 is used to calculate the cost and benefits of distributed photovoltaic access to the distribution network when the sum of the limited power at all time points is less than or equal to the preset value.

The comprehensive benefit calculation module 306 is configured to determine the comprehensive benefits of distributed photovoltaics connected to the distribution network based on the costs and benefits brought about by the distributed photovoltaics connected to the distribution network.

The comprehensive benefit analysis device for distributed photovoltaic access provided by the embodiment of the present invention can determine the distribution parameters after distributed photovoltaic access to the distribution network based on the planning information of distributed photovoltaic access to the distribution network, and then based on the distribution The parameter calculates the steady-state power flow point by time within the preset time period, and determines the power limit at each time point based on the steady-state power flow at each time point. When the sum of the power limit at all time points is less than or equal to the preset value When calculating the cost and benefits brought by distributed photovoltaic access to the distribution network, and based on the costs and benefits brought by distributed photovoltaic access to the distribution network, determine the comprehensive benefits of distributed photovoltaic access to the distribution network . It can be seen that the comprehensive benefit analysis device for distributed photovoltaic access provided by the embodiment of the present invention can determine the comprehensive benefits of distributed photovoltaic access to distribution network based on the planning information of distributed photovoltaic access to distribution network, so as to provide Distributed photovoltaic optimization planning provides a scientific basis.

The device provided in the above embodiments may further include: a retrofit strategy determination module and a power distribution parameter adjustment module. in:

The transformation strategy determination module is used to determine the transformation strategy of the distribution network when the sum of the limited power at all time points is greater than a preset value.

The power distribution parameter adjustment module is used to adjust the power distribution parameters of the distribution network based on the transformation strategy, and then trigger the power distribution parameter determination module to calculate the steady-state power flow point-by-time within a preset time period based on the new power distribution parameters.

In the device provided by the above embodiments, the cost and benefit calculation module includes: a cost calculation sub-module and a benefit calculation sub-module. in:

The cost calculation sub-module is used to calculate the initial investment cost, power grid transformation cost, maintenance cost and power-cutting loss of distributed photovoltaic access to the distribution network, and calculate the sum of the initial investment cost, power grid transformation cost, maintenance cost and power-limiting loss The cost of connecting distributed photovoltaics to the distribution network.

The income calculation sub-module is used to calculate the delay system investment income, system loss reduction income, energy saving benefit, environmental benefit, expected electricity sales income and reliability income brought by distributed photovoltaic access to the distribution network, and calculate the delay system Investment income, system loss reduction income, energy saving benefits, environmental benefits, expected electricity sales income and reliability income, and the income brought by the access of distributed photovoltaics to the distribution network.

In the device provided by the above embodiments, the power limit determination module includes: a power supply parameter calculation submodule, a judgment submodule, an electronic limit module, and an acquisition submodule. in:

The power supply parameter calculation sub-module is used to determine the power supply parameters at each time point based on the steady-state power flow at each time point.

The judging sub-module is used to judge whether the power supply parameter at each time point exceeds the preset power supply value.

The limiting electronic module is used for limiting power according to a preset power limiting strategy when the power supply parameter exceeds a preset power supply value.

The obtaining sub-module is used to obtain the limited power at the time point when the power supply parameter exceeds the preset power supply value.

In the device provided by the above embodiment, the steady-state power flow calculation module is specifically used to calculate the steady-state power flow hour by hour within 8760 hours of the year based on the power distribution parameters.

Each embodiment in this specification is described in a progressive manner, each embodiment focuses on the difference from other embodiments, and the same and similar parts of each embodiment can be referred to each other.

In the several embodiments provided in this application, it should be understood that the disclosed methods, devices and equipment can be implemented in other ways. For example, the device embodiments described above are only illustrative. For example, the division of units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components can be combined or integrated. to another system, or some features may be ignored, or not implemented. In another point, the mutual coupling or direct coupling or communication connection shown or discussed may be through some communication interfaces, and the indirect coupling or communication connection of devices or units may be in electrical, mechanical or other forms.

A unit described as a separate component may or may not be physically separated, and a component displayed as a unit may or may not be a physical unit, that is, it may be located in one place, or may be distributed to multiple network units. Part or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment. In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, each unit may exist separately physically, or two or more units may be integrated into one unit.

If the functions are realized in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the essence of the technical solution of the present invention or the part that contributes to the prior art or the part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including Several instructions are used to make a computer device (which may be a personal computer, a server, or a network device, etc.) execute all or part of the steps of the methods in various embodiments of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), magnetic disk or optical disk, and other media that can store program codes.

The above description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention will not be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. a kind of comprehensive benefit analysis method that distributed photovoltaic is accessed, it is characterised in that methods described includes：

The planning information of power distribution network is accessed based on distributed photovoltaic, determines that the distributed photovoltaic accesses matching somebody with somebody after the power distribution network Electrical quantity；

Steady-state load flow, and the stable state based on each time point are calculated based on described by time point in preset time period with electrical quantity Trend determines the amount of rationing the power supply of each time point, and the time interval of adjacent time point is identical in the preset time period；

Judge the amount of the rationing the power supply summation of all time points whether more than preset value；

When the amount of the rationing the power supply summation of all time points is less than or equal to the preset value, calculates the distributed photovoltaic and access The costs and benefits that the power distribution network is brought；

The cost for accessing power distribution network based on the distributed photovoltaic and the income brought determine that the distributed photovoltaic accesses institute State the comprehensive benefit of power distribution network.

2. method according to claim 1, it is characterised in that methods described also includes：

When the amount of the rationing the power supply summation of all time points is more than the preset value, the Reconstruc-tion policy of the power distribution network is determined, and Based on the Reconstruc-tion policy adjust the power distribution network with electrical quantity, be then back to it is described based on it is described with electrical quantity when default Between the step for calculate steady-state load flow by time point in section.

3. the method stated according to claim 1, it is characterised in that the calculating distributed photovoltaic accesses the power distribution network Cost and the income brought include：

Calculate initial investment cost, electric network reconstruction cost, maintenance cost and limit that the distributed photovoltaic accesses the power distribution network Electric loss simultaneously calculates the sum of the initial investment cost, the electric network reconstruction cost, the maintenance cost and the loss of rationing the power supply The cost of the power distribution network is accessed as the distributed photovoltaic；

Calculate that the distributed photovoltaic accesses that the power distribution network brought delays system investments income, reduces system loss and receive Electric income and reliability benefits are sold in benefit, energy-saving benefit, environmental gain, expection, and delay system investments income, described described in calculating Reduce system loss income, the energy-saving benefit, the environmental gain, the expection and sell electric income and the reliability benefits The income that the power distribution network is brought is accessed with as the distributed photovoltaic.

4. method as claimed in any of claims 1 to 3, it is characterised in that described based on the steady of each time point State trend determines the amount of rationing the power supply of each time point, including：

The power supply parameter of each time point is determined based on the steady-state load flow of each time point；

Whether the power supply parameter of each time point is judged beyond default power supply value, and exceed the default confession in the power supply parameter During electricity value, rationed the power supply by default strategy of rationing the power supply；

Obtain ration the power supply amount of the power supply parameter beyond the time point of default power supply value.

5. method as claimed in any of claims 1 to 3, it is characterised in that described to be existed with electrical quantity based on described Steady-state load flow is calculated by time point in preset time period, including：

Steady-state load flow was calculated based on described by hour within 8760 hours years with electrical quantity.

6. the comprehensive benefit analysis device that a kind of distributed photovoltaic is accessed, it is characterised in that described device includes：It is true with electrical quantity Cover half block, steady parameter module, the amount of rationing the power supply determining module, judge module, costs and benefits computing module, comprehensive benefit meter Calculate module；

The distribution parameter determination module, for accessing the planning information of power distribution network based on distributed photovoltaic, determines the distribution Formula photovoltaic access after the power distribution network with electrical quantity；

The steady parameter module, for calculating stable state tide by time point in preset time period with electrical quantity based on described Stream；

The amount of the rationing the power supply determining module, for determining the amount of rationing the power supply of each time point, institute based on the steady-state load flow of each time point The time interval for stating adjacent time point in preset time period is identical；

The judge module, for judging the amount of the rationing the power supply summation of all time points whether more than preset value；

The costs and benefits computing module, for presetting less than or equal to described when the amount of the rationing the power supply summation of all time points During value, the cost that the distributed photovoltaic accesses the power distribution network and the income brought are calculated；

The comprehensive benefit computing module, the costs and benefits for being brought based on distributed photovoltaic access power distribution network are true The fixed distributed photovoltaic accesses the comprehensive benefit of the power distribution network.

7. device according to claim 6, it is characterised in that described device also includes：

Reconstruc-tion policy determining module, for when the amount of the rationing the power supply summation of all time points is more than the preset value, determining institute State the Reconstruc-tion policy of power distribution network；

Distribution parameter adjustment module, with electrical quantity, institute is then triggered for based on the Reconstruc-tion policy adjustment power distribution network State distribution parameter determination module and calculate steady-state load flow by time point in preset time period with electrical quantity based on new.

8. the device stated according to claim 6, it is characterised in that the costs and benefits computing module includes：Cost calculation Module and income calculation submodule；

The cost calculation submodule, for calculating initial investment cost, electricity that the distributed photovoltaic accesses the power distribution network Net improvement cost, maintenance cost and ration the power supply and lose and calculate the initial investment cost, the electric network reconstruction cost, the maintenance Cost and the loss of rationing the power supply and access the cost of the power distribution network as the distributed photovoltaic；

The income calculation submodule, sells for calculating the expection that the distributed photovoltaic access power distribution network is brought Electric income and reliability are sold in electric income, the system investments income that delays, reduction system loss income, energy-saving benefit, environmental gain, expection Property income, and calculate described in delay system investments income, the reduction system loss income, the energy-saving benefit, the environment It is that income, the expection sell electric income and the reliability benefits and access power distribution network institute band as the distributed photovoltaic The income come.

9. the method according to any one in claim 6 to 8, it is characterised in that the amount of the rationing the power supply determining module includes： Power supply parameter calculating sub module, judging submodule, ration the power supply submodule and acquisition submodule；

The power supply parameter calculating sub module, for determining the power supply ginseng of each time point based on the steady-state load flow of each time point Number；

The judging submodule, for judging the power supply parameter of each time point whether beyond default power supply value；

The submodule of rationing the power supply, for when the power supply parameter exceeds the default power supply value, entering by default strategy of rationing the power supply Row is rationed the power supply；

The acquisition submodule, for obtaining ration the power supply amount of the power supply parameter beyond the time point of default power supply value.

10. the method according to any one in claim 6 to 8, it is characterised in that the steady parameter module, Specifically for calculating steady-state load flow by hour within 8760 hours years with electrical quantity based on described.