CN112926851A - Method for calculating benefit of pumped storage power station - Google Patents

Abstract

The invention discloses a method for calculating the benefit of a pumped storage power station, which comprises the following steps: determining at least one index type representing the benefit of the pumped storage power station and at least one index contained in each index type; calculating a corresponding index value based on the determined index; calculating a first weight of each index based on the index type; calculating a second weight of each index based on an entropy weight method; determining a third weight corresponding to each index by combining the first weight and the second weight; and determining the value of the benefit of the pumped storage power station by combining the index values corresponding to the indexes and the third weight.

Description

Method for calculating benefit of pumped storage power station

Technical Field

The invention relates to the technical field of energy and power, in particular to a method for calculating the benefit of a pumped storage power station.

Background

The power system has a plurality of users, and the respective working time and demand conditions are different, so that the system load is unbalanced. Generally, the power system has a peak power demand in the daytime and in the evening, and a valley power consumption in the midnight. In order to maintain the output of the thermal power station stable, relevant users are required to absorb electric energy in the valley, and a pumped storage power station is the best choice.

The pumped storage power station can produce peak power, that is, electric energy in a non-peak load period is converted into electric energy in a peak load period. Therefore, the pumped storage power station is an important power source for building a new generation of power system in China, can meet different requirements of a power grid, and plays double roles of a power plant and a power consumer in the power system. On one hand, the pumped storage power station can convert redundant electric energy into potential energy of water when the load of a power grid is low, and the energy is stored by pumping water at a low position to a high position, and the pumped storage power station plays a role of a power consumer at the moment. On the other hand, the potential energy of water can be converted into electric energy at the load peak, and the electric energy is generated according to the requirement of the power system, so that the electric energy is effectively stored, and the pumped storage power station plays the function of a power plant.

In view of this, how to accurately evaluate the benefits of the pumped storage power station to lay a foundation for pumped storage planning becomes important.

Disclosure of Invention

To this end, the present invention provides a method of calculating the benefits of pumped-storage power stations in an attempt to solve or at least alleviate at least one of the problems identified above.

According to one aspect of the present invention, there is provided a method of calculating the benefits of a pumped-hydro energy storage power station, comprising the steps of: determining at least one index type representing the benefit of the pumped storage power station and at least one index contained in each index type; calculating a corresponding index value based on the determined index; calculating a first weight of each index based on the index type; calculating a second weight of each index based on an entropy weight method; determining a third weight corresponding to each index by combining the first weight and the second weight; determining the value of the benefit of the pumped storage power station by combining the index values corresponding to the indexes and the third weight

Optionally, in the method according to the invention, the indicator type comprises at least one or more of the following types: economic index, technical index, social index and environmental index.

Optionally, in the method according to the present invention, the step of calculating the first weight of each index based on the index type includes: calculating a weight coefficient of each index type according to the importance degree of each index type; and determining the first weight of each index in each index type by combining the weight coefficient of each index type.

Optionally, in the method according to the present invention, the step of determining the first weight of each indicator in each indicator type in combination with the weight coefficient of each indicator type includes: determining the initial weight of each index according to the importance degree of each index; and taking the product of the weight coefficient of each index type and the initial weight of each index under the index type as the first weight of each index in each index type.

Optionally, in the method according to the present invention, the step of calculating the second weight of each index based on an entropy weight method includes: respectively carrying out normalization processing on each index aiming at the measured value of each index to obtain the measured value of each index after normalization; respectively calculating the entropy of each index based on the measured value after each index is normalized; and respectively determining the second weight of each index according to the entropy of each index.

Optionally, in the method according to the invention, the second weight is calculated as follows:

wherein d is_j＝1-e_jJ is 1, …, m, where ω is_jSecond weight, e, representing the j-th index_jEntropy of j-th index, d_jThe information entropy redundancy of the jth index is shown, m represents the total number of indexes, and n represents the total number of measured values corresponding to each index.

Optionally, in the method according to the present invention, the step of calculating a weight coefficient for each index type according to the importance degree of each index type includes: determining the order relation representing the importance degree of each index type; determining relative importance degree between adjacent index types based on the order relation; and calculating the weight coefficient of each index type according to the relative importance degree.

Optionally, in the method according to the invention, the economic indicator type comprises at least one or more of the following indicators: peak and valley load regulation benefit, frequency modulation benefit, phase modulation benefit, standby benefit, black start benefit, electric quantity benefit and capacity benefit; the technical indicator type includes at least one or more of the following indicators: the unit availability factor, the starting success rate, the annual starting times and the annual frequency qualification rate; the social index types at least comprise employment effects, and the employment effects comprise unit investment employment number and direct employment effects; and the environmental indicator type includes at least one or more of the following indicators: pollutant discharge, water and soil loss rate, and influence on clean energy consumption.

According to yet another aspect of the present invention, there is provided a computing device comprising: one or more processors; and a memory; one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors, the one or more programs including instructions for performing any of the methods described above.

According to a further aspect of the invention there is provided a computer readable storage medium storing one or more programs, the one or more programs comprising instructions, which when executed by a computing device, cause the computing device to perform any of the methods described above.

In conclusion, according to the scheme of the invention, on one hand, the working characteristics of the pumped storage power station are considered, and indexes are selected from the aspects of economy, technology, society and environment to comprehensively evaluate the pumped storage power station; on the other hand, the combined weighting method is adopted to weight each index, and the subjective weighting method and the objective weighting method are logically and organically combined together, so that the final evaluation result can truly reflect the operation state of the pumped storage power station.

Drawings

To the accomplishment of the foregoing and related ends, certain illustrative aspects are described herein in connection with the following description and the annexed drawings, which are indicative of various ways in which the principles disclosed herein may be practiced, and all aspects and equivalents thereof are intended to be within the scope of the claimed subject matter. The above and other objects, features and advantages of the present disclosure will become more apparent from the following detailed description read in conjunction with the accompanying drawings. Throughout this disclosure, like reference numerals generally refer to like parts or elements.

FIG. 1 shows a schematic diagram of a configuration of a computing device 100 according to one embodiment of the invention;

FIG. 2 illustrates a flow diagram of a method 200 of calculating pumped-hydro power plant benefits in accordance with one embodiment of the present invention.

Detailed Description

Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

Fig. 1 is a block diagram of an example computing device 100. In a basic configuration 102, computing device 100 typically includes system memory 106 and one or more processors 104. A memory bus 108 may be used for communication between the processor 104 and the system memory 106.

Depending on the desired configuration, the processor 104 may be any type of processor, including but not limited to: a microprocessor (μ P), a microcontroller (μ C), a Digital Signal Processor (DSP), or any combination thereof. The processor 104 may include one or more levels of cache, such as a level one cache 110 and a level two cache 112, a processor core 114, and registers 116. The example processor core 114 may include an Arithmetic Logic Unit (ALU), a Floating Point Unit (FPU), a digital signal processing core (DSP core), or any combination thereof. The example memory controller 118 may be used with the processor 104, or in some implementations the memory controller 118 may be an internal part of the processor 104.

Depending on the desired configuration, system memory 106 may be any type of memory, including but not limited to: volatile memory (such as RAM), non-volatile memory (such as ROM, flash memory, etc.), or any combination thereof. System memory 106 may include an operating system 120, one or more applications 122, and program data 124. In some embodiments, application 122 may be arranged to operate with program data 124 on an operating system. In some embodiments, the computing device 100 is configured to perform the method 200 for pumped-hydro power plant benefits, with the program data 124 including instructions for performing the method described above.

Computing device 100 may also include an interface bus 140 that facilitates communication from various interface devices (e.g., output devices 142, peripheral interfaces 144, and communication devices 146) to the basic configuration 102 via the bus/interface controller 130. The example output device 142 includes a graphics processing unit 148 and an audio processing unit 150. They may be configured to facilitate communication with various external devices, such as a display or speakers, via one or more a/V ports 152. Example peripheral interfaces 144 may include a serial interface controller 154 and a parallel interface controller 156, which may be configured to facilitate communication with external devices such as input devices (e.g., keyboard, mouse, pen, voice input device, image input device) or other peripherals (e.g., printer, scanner, etc.) via one or more I/O ports 158. An example communication device 146 may include a network controller 160, which may be arranged to facilitate communications with one or more other computing devices 162 over a network communication link via one or more communication ports 164.

A network communication link may be one example of a communication medium. Communication media may typically be embodied by computer readable instructions, data structures, program modules, and may include any information delivery media, such as carrier waves or other transport mechanisms, in a modulated data signal. A "modulated data signal" may be a signal that has one or more of its data set or its changes made in such a manner as to encode information in the signal. By way of non-limiting example, communication media may include wired media such as a wired network or private-wired network, and various wireless media such as acoustic, Radio Frequency (RF), microwave, Infrared (IR), or other wireless media. The term computer readable media as used herein may include both storage media and communication media. In some embodiments, one or more programs are stored in a computer readable medium, the one or more programs including instructions for performing certain methods.

Computing device 100 may be implemented as a personal computer including both desktop and notebook computer configurations, as well as a server. Computing device 100 may also be implemented as part of a small-form factor portable (or mobile) electronic device such as a cellular telephone, digital camera, Personal Digital Assistant (PDA), personal media player device, wireless web-browsing device, personal headset device, application specific device, or hybrid device that include any of the above functions.

The flow of the method 200 for calculating the pumped-hydro storage power plant benefits according to one embodiment of the present invention will be described in detail below with reference to fig. 2.

As shown in fig. 2, the method 200 begins with step S210, in which at least one index type characterizing the benefit of the pumped-storage power plant and at least one index included in each index type are determined.

The efficiency of a pumped-hydro power plant is determined by its own functionality, both in the electric energy market and in the ancillary services market. Aiming at the actual requirements of the design of the operation index system of the pumped storage power station, the following basic principles are followed when the evaluation index system of the pumped storage power station is determined:

(1) purpose of

The evaluation target is the starting point of all evaluation works. Before the index system is established, the purpose of evaluation should be clarified, and the structure and selection of the index should be expanded around the target to be evaluated. The evaluation process should be compared with the target to avoid target deviation.

(2) Normative property

Normalization is the most important principle in basic index design. First, a single indicator must have strict physical significance and must have definite definition. Secondly, index naming should have good consistency and readability to guarantee understanding, mastering and application of relevant operators in the practice process. In addition, all basic indexes should be attached to a certain index system category, so as to facilitate the subsequent classification of the indexes.

(3) All-round

The index system is required to be capable of comprehensively reflecting the evaluation target and the evaluation object, and meanwhile, the indexes are independent and have certain logical relation, and all the indexes form an organic whole.

(4) Systematicness

The selection of the secondary indexes of the evaluation system should be systematic, and the actual requirements of the operation work of the power distribution network on different time dimensions, different data themes and different management targets are considered comprehensively. Firstly, the overall framework of an index system is determined, dimensions concerned by the index system are defined, and then proper basic indexes are selected step by step in each microscopic module in the index system, so that the comprehensive evaluation index system for coordinated dispatching of the power distribution network with clear arrangement, reasonable structure and comprehensive content is constructed.

(5) Simplicity and conciseness

The selection of the index should have certain typical representativeness, and can reflect a certain aspect of the evaluation problem prominently, and meanwhile, the selected index should be as little as possible on the premise of reflecting the evaluation problem sufficiently. The simple index can also enable the actual operator to clear the head and grasp the key. The establishment of the index system should avoid repetition, and when the index system is established, the repetition degree among indexes is also noticed besides the positioning of the index system, so that the waste of resources caused by the selection of similar and same indexes is avoided.

(6) Combining qualitative and quantitative

In the face of complex evaluation problems, scientific quantitative analysis methods need to be considered, and qualitative analysis such as expert knowledge and experience needs to be combined to possibly obtain scientific and reasonable evaluation conclusions.

(7) Principle of comparability

The index system should conform to the comparable principle in space and time, and the relative quantity index with stronger comparability and the comparable index with common characteristic are adopted as much as possible. Meanwhile, the meaning, statistical caliber and range of each index should be clear, and the comparability of data is ensured.

Based on the above, the pumped storage power station has an important peak and valley adjusting function in the electric energy market, so that the peak and valley adjusting benefit of the power station is generated, and the economic benefit of the pumped storage power station is influenced by combining the functions of frequency modulation and phase modulation, a standby power station and the like of the pumped storage power station in the auxiliary service market, so that the peak and valley adjusting benefit, the frequency modulation and phase modulation standby benefit, the electric quantity benefit, the capacity benefit and the benefits generated by other auxiliary service functions such as the black start benefit are used as the economic benefit of the pumped storage power station.

The technical characteristics of the pumped storage unit are considered, and the benefit brought to the power station by influencing the technical level of the pumped storage power station is used as a technical benefit index.

Meanwhile, the pumped storage power station as a social service project brings great changes to people living around the power station, the environment of the area and the consumption level of clean energy in the area, and benefits influencing the two aspects of the people living and the environment are respectively used as social benefit indexes and environmental benefit indexes.

In summary, in one embodiment, the determined indicator types include at least one or more of the following types: economic index, technical index, social index and environmental index.

Meanwhile, the economic indicator type includes at least one or more of the following indicators: peak load shifting benefits, frequency modulation benefits, phase modulation benefits, standby benefits, black start benefits, electricity benefits, and capacity benefits.

The technical indicator type includes at least one or more of the following indicators: the unit availability factor, the starting success rate, the annual starting times and the annual frequency qualification rate.

The social index types at least comprise employment effects, and the employment effects comprise unit investment employment number and direct employment effects.

The environmental indicator types include at least one or more of the following indicators: pollutant discharge, water and soil loss rate, and influence on clean energy consumption.

Subsequently, in step S220, based on the determined index, a corresponding index value is calculated.

The calculation process of each index value will be described below according to the index type.

(1) Economic index

1) Peak load shifting benefit

The pumped storage power station is put into a power grid to run together with thermal power, so that the fuel saving generated by the whole power system is mainly embodied in the following two aspects: peak shaving coal saving and grain filling coal saving. And determining the value of the peak load and valley load adjusting benefit by combining the power generation data of the thermal power generating unit which operates in combination with the pumped storage unit.

The peak regulation coal saving means that the pumped storage power station can effectively undertake the peak regulation task of the system, thereby replacing the peak regulation thermal power generating unit with high coal consumption rate and expensive power generation cost, reducing the total fuel consumption of the system, and saving the part of fuel is called peak regulation coal saving.

The grain filling and coal saving is that when the system is in the low valley, the pumped storage power station uses the electric energy generated by the thermal power unit with waist load as the pumped power supply, so that the waist load is converted into the basic load, the operation condition of the thermal power unit is improved, the utilization rate of the unit equipment is improved, the plant power consumption rate and the coal consumption rate are reduced, and the saving of the fuel is called grain filling and coal saving.

The sum of the coal saving benefits in the two aspects is obtained by deducting the fuel consumption for the pumped storage group to pump water for power generation, namely the peak load regulation and valley filling coal saving benefit of the pumped storage power station. The peak load regulation and valley filling mode of the thermal power generating unit is assumed to be load regulation and valley filling, and accordingly, the benefits of the pumped storage power station are analyzed:

in the above formula, T_fIs the peak regulation time with the unit of h; n is a radical of_fThe unit of the capacity of the thermal power generating unit for bearing the peak regulation task is kW; b_y0The unit is the power generation coal consumption rate of the thermal power generating unit in gram/kWh when rated to work; f is the load pressing rate; b_yThe unit is the power generation coal consumption rate of the thermal power generating unit during the pressure load work, and the unit is gram/kWh; t is_gThe valley filling time is expressed in h; n is a radical of_gThe unit of the capacity of the thermal power generating unit for carrying the valley filling is kW; t is_pThe unit is h for the number of hours of power generation of the pumped storage power station; n is a radical of_pThe unit of the capacity of the pumped storage unit for filling the valley is kW; eta is the comprehensive efficiency coefficient of the pumped storage power station, and the numerical value of eta is generally between 0.65 and 0.75; p₀The unit is yuan/ton, which is the coal price.

2) Efficiency of frequency modulation

The stability of the frequency of the power system is a key index of the power supply quality, and when the active power of the power generation and utilization of the system is unbalanced, the frequency fluctuates, so that the output of the generator set can be adjusted in real time along with a load curve in order to ensure the stable frequency. The thermal power generating unit is used for frequency modulation, the generating efficiency is reduced, the generating coal consumption is increased, and the pumped storage power station can provide frequency modulation service for the system quickly, flexibly and efficiently.

In one embodiment, the pumped storage power unit replaces a thermal power unit, and thermal power dynamic cost saved during frequency modulation is provided for the system, which is called frequency modulation benefit of the pumped storage power station. Expressed by the following formula:

in the formula, b_0iRepresenting the weighed standard coal consumption of the thermal power generating unit during peak shaving, and taking g/kw.h as a unit; p is a radical of_eRepresents the coal price, and takes yuan/ton as unit; b_iRepresenting the coal consumption rate of the ith thermal power generating unit from the minimum technical output to the full load output, and taking gram/kWh as a unit; i represents the investment of the unit, and ten thousand yuan is taken as a unit; n is_iRepresenting the times of daily starting or load lifting of the ith thermal power generating unit, and taking the times as a unit; t is_iRepresenting the number of hours of frequency modulation operation of the thermal power generating unit in one day, and taking h as a unit; h represents the average head of the hydropower station, and N is the unit of m_iThe capacity of a thermal power generating unit is represented, and ten thousand kW is taken as a unit; beta represents a maintenance cost coefficient of the frequency-modulated thermal power caused by the unit failure due to frequent change of the working condition; x represents the overhaul rate of the unit; y represents the proportion of the unit minor repair cost to the major repair cost; v represents the water turbine starting no-load water consumption in m³Is a unit; n is_HRepresenting the date starting times of the water turbine, and taking the times as a unit; m is_HRepresents the number of corresponding water turbines, and takes the number of the corresponding water turbines as a unit; p represents the electricity price in units of dollars per kWh; i is₁₂Representing the frequency modulation benefit of the pumped storage power station.

3) Benefit of phase modulation

The stability of the voltage of the power system is a key index of the quality of power supply, and when the reactive power of power generation and utilization of the system is unbalanced, the voltage fluctuates, so that the reactive power must be compensated in real time to ensure the voltage stability. The reactive compensation by using the thermal power generating unit usually has higher cost, and the pumped storage power station can ensure that the phase modulation service is provided for the system quickly, flexibly and efficiently.

In one embodiment, the pumped storage unit replaces a thermal power unit to provide the thermal power dynamic cost saved in phase modulation for the system, which is called as the phase modulation benefit of the pumped storage power station. The phase modulation benefit of pumped storage power stations can be expressed as:

I₁₃＝P₀·Q·cosθ·sinθ·(A/P,i,n)+P₀·Q·cosθ·sinθ·2％ (3)

wherein, I₁₃The annual phase modulation benefit of the pumped storage power station is achieved; p₀Representing the unit active capacity investment of the unit without considering the current capacity unit; q is the reactive capacity of the unit; cos θ represents the rated power factor; i represents social discount rate; and n represents the design service life of the pumped storage power station.

4) Spare benefit

To ensure the reliability of the power system, a certain proportion of the capacity must be reserved for rotation. The use of thermal power plants to provide rotary redundancy is often costly, while pumped storage power plants provide rotary redundancy for the system at a lower cost and with flexible adjustability. In one embodiment, the pumped storage power unit replaces a thermal power unit to provide the system with the thermal power dynamic cost saved when the system is in rotary standby, which is called the standby benefit of the pumped storage power station. The calculation method comprises the following steps:

I₁₄＝C×30％×2η (4)

wherein I₁₄For the emergency benefit, C is the total installed capacity of the power station, and eta is the comprehensive efficiency coefficient of the pumped storage power station.

5) Black start benefits

In order to reduce the economic loss caused by power failure when the power system fails to work and the power failure accident is caused, black powder is utilizedAnd the pumped storage unit with the starting function is used as a guarantee. The major costs that it generates to implement this function include: the method comprises the following steps of black start function annual test expense (or experiment expense), black start unit annual maintenance expense, minimum power cost compensation required by operation of basic plant equipment, calculation of black start electric quantity, minimum power cost compensation required by self-starting of unit generator, and social and economic loss reward and dynamic reward recovery₁₅Expressed in units of elements.

6) Electric quantity benefit

The thermal power generating unit is usually highest in efficiency under rated output, when the thermal power generating unit provides auxiliary service for a system, the output level of the thermal power generating unit needs to be changed rapidly, when the thermal power generating unit is operated under load reduction, the coal consumption of unit kW power generation can be increased greatly, and the power generation efficiency and the economical efficiency can be reduced. The pumped storage power station can be flexible and efficient in load adjustment, and when the pumped storage power station replaces a thermal power generating unit to provide auxiliary service for a system, the power generation efficiency of the thermal power generating unit can be improved, so that the generated economic benefit becomes an electric quantity benefit. Under the condition of the same user power demand level, the calculation method of the coal consumption saved by the pumped storage unit is the difference between the coal consumption of the thermal power peak shaving unit with low efficiency and the coal consumption of the pumped storage unit with high efficiency during peak shaving, namely the electric quantity benefit. The formula for calculating the electric quantity benefit of the pumped storage power station is as follows:

I₁₆＝B′-B (5)

in the formula, B' represents the total daily coal consumption when the system does not call the pumped storage power station; b represents the total daily coal consumption of the system when the pumped storage power station participates in the auxiliary service of the system; i is₁₆The difference between the two is the electric quantity benefit of the pumped storage power station.

7) Capacity benefit

The pumped storage power station does not consume fossil energy for power generation, but directly utilizes electric energy, and when the pumped storage power station is matched with clean energy for power generation, the pumped storage power station can effectively reduce the consumption of a power system on fossil energy such as coal and the like, and generates economic benefit. The capacity of the pumped storage power station born in the system can be divided into two parts; capacity borne by the power generation market and spinning reserve capacity. Therefore, the capacity benefit can be reduced from the investment operation cost of the thermal power generating unit of the pumped storage power station due to the burden of power generation and spare capacity. The following formula represents a calculation formula of the capacity benefit of the pumped storage power station:

I₁₇＝[C₀+I₀(A/P,i,n)]-[C_ps+I_ps(A/P,i,n_ps)] (6)

in the formula I₁₇The capacity benefit of the pumped storage power station is shown; c₀Representing the annual fixed operating cost of the thermal power generating unit; i is₀Representing the construction investment of the thermal power generating unit; n represents the investment recovery period of the thermal power generating unit; i is_psThe construction period investment of the same-capacity pumped storage power station is shown; c_psThe annual fixed operating cost of the pumped storage power station with the same capacity is shown; i represents a reference discount rate; n is_psThe investment recovery period of the pumped storage power station is shown; A/P represents a capital recovery factor, wherein A represents annuity and P represents present value.

(2) Technical index

1) Availability factor of unit

The unit availability factor refers to the proportion of the pumped storage unit in a standby state in the statistical period, and is represented by the following formula.

2) Success rate of start-up

The starting success rate refers to the probability of successful starting of the pumped storage unit according to the specification within a given time. The pumped storage unit has two working conditions of power generation and pumping, and the starting of the power generation working condition mostly provides accident reserve capacity for a power system, so the successful starting of the power generation working condition is more important.

3) Number of annual starts

With the continuous improvement of the power supply quality in the economic development, the dynamic action of the pumped storage power station in the power grid is more and more important, and accordingly, the pumped storage power station can be frequently started to undertake the tasks of power grid phase modulation, frequency modulation, accident standby and the like. Therefore, in one embodiment, the annual startup times are selected as measures of the technical effects of the pumped storage power station, including the startup and shutdown times required by annual power generation, pumping, phase modulation, emergency frequency modulation and emergency standby, which reflect the utilization condition of the pumped storage power station, and the calculation formula is as follows:

4) annual frequency qualification rate

The voltage and frequency fluctuation caused by the random change of the power load and other external interference during the operation of the power system influences the operation stability of the power system, and the pumped storage power station can adapt to the sudden change of the load and correspondingly adjust the output, and the frequency modulation is flexible and reliable. The rated frequency standard of the power system in China is 50Hz, the frequency quality is generally expressed by the frequency qualification rate, namely the ratio of qualified time to running time is counted according to minutes and is divided into daily, monthly, seasonal and annual statistics. The annual frequency qualification rate index of the power station is used for assessment, and the calculation formula is as follows:

qualified time of daily frequency 1440(min) -abnormal time of daily frequency (min) (10)

(3) Social index

1) Employment effect

Hydroelectric engineering often requires a large number of skilled and average workers during construction. Many managers and workers are also required to manage the operation period after the project is finished. Therefore, the employment effect created by building the power station is very obvious. In one embodiment according to the present invention, the employment effect index includes the number of employment persons invested in a unit and the direct employment effect, which are calculated as follows:

unit investment employment people (people)/project investment (ten thousand yuan) (12)

Direct employment effect (direct employment people/direct investment (ten thousand yuan) of project provided as project (13)

Wherein, the direct employment effect refers to the employment opportunity directly provided by the project.

In addition to employment effects, social indicators may include: impact on related industries.

2) Influence on related industries

With the development of project construction, the prior projects of traffic, building materials and the like are developed correspondingly. The geographical position of the pumped storage power station is mostly near cities and scenic spots, and if beautifying and greening of the environment are paid attention to in the construction period, the reservoir area becomes a new tourist landscape and a rest resort, thereby promoting the development of service industries such as local tourist industry, commerce and entertainment. The built pumped storage power station in China can be used as a travel vacation place through reasonable environment planning while the functions of the pumped storage power station are realized, for example, a high-tech industrial tourist attraction mainly comprising a power plant and travel is formed around the Guangzhou storage power station, and the pumped storage power station is called as a pearl in the south Guangdong province; the terrace pumped storage power station is in the natural and beautiful stream canyon, and is used as a main scenic spot after being built, thereby becoming another important component of the tourist landscape.

(4) Environmental index

1) Discharge amount of pollutants

Wind energy, nuclear energy and the like are greatly influenced by external wind power changes, and if other clean energy sources do not pass through a pumped storage power station to be in relay matching operation after power generation, impact on a power grid due to instant load increase can be caused, and the safe operation of a power system is influenced. Therefore, it is feasible that according to the designed capacity of other clean energy power stations, a pumped storage power station is constructed in a matching mode according to a certain proportion to serve as a buffer, for example, a wind driven generator generates electricity, the pumped storage power station operates under a pumping working condition to temporarily store electric quantity, and the pumped storage power station transmits the electric quantity to a power grid when the system needs, so that the effect of guaranteeing the balance of the electric quantity of the electric power of the power system is achieved. Under the matching effect, the pumped storage power station is obtained by the following formula:

in the formula I₄₁Reducing the discharge of pollutants under the matching effect; k is annual energy production, and k is annual energy production/(8760 system rated power); eta is the energy conversion efficiency of the pumped storage power station, and is generally about 75 percent; b_fThe unit emission of pollutants of the thermal power generating unit is under the condition of equivalent load output; omega_iThe unit coal consumption rate (kg/kw.h) of the thermal power generating unit during power generation under the condition of equivalent load output is shown.

2) Influence on soil and vegetation, i.e. rate of soil and water loss

The universal soil loss agenda (USLE) is currently the method commonly used to calculate hydraulic erosion. The calculation formula is as follows:

M＝F×A (15)

A＝R×K×L_s×C×P (16)

L_s＝(L/22.1)^0.5.(S/9)^1.4 (17)

I₄₂＝M/Q (18)

wherein, I₄₂The water loss and soil erosion rate is shown; m is the water and soil loss amount, and the unit is t/a; f is the area of water and soil loss in hm²(ii) a A is the average water and soil loss per unit area for years and is given by t/(hm)²A); r is a rainfall erosion force factor, and representative 20-year monthly rainfall series calculation of a pumped storage power station construction area is selected; k is a soil erodible factor, is related to the mechanical composition, organic matter content, soil structure and soil water permeability of soil, and can be determined by looking up a table; l is_sIs a terrain factor, related to the length of the slope L and the slope S; c is a vegetation and operation management factor, which is related to vegetation coverage and cultivation period, and the value is 1 because the premise of water and soil loss prediction is that no water conservation measures are taken; p is a water and soil conservation measure factor, mainly refers to engineering measures, vegetation measures and agricultural measures, and is 1.

3) Influence on clean energy consumption

Because wind power output is uncontrollable, the water and electricity reservoir regulating capacity in the water-rich period is limited, and nuclear power cannot participate in system peak regulation due to the consideration of nuclear safety and unit operation economy, the peak regulation and frequency regulation pressure of the system is gradually increased along with the continuous improvement of the permeability of clean energy in a regional power grid. The pumped storage power station is used as an important means for system adjustment, and is subjected to 'bundling scheduling' with clean energy, so that the utilization rate of the clean energy can be promoted and the electricity abandoning phenomenon of the clean energy can be reduced under the condition of ensuring the safe and reliable operation of the system. Therefore, the power generation proportion of the wind power, the nuclear power and the hydropower is increased after the pumped storage power station is connected to a local provincial or regional power grid, and the index of the benefit of the pumped storage power station for promoting the utilization of the clean energy is calculated through the power increase and generation amount of the clean energy (hydropower, wind power and the like), and the unit is MW.

Subsequently, in step S230, a first weight of each index is calculated based on the index type.

Specifically, step S230 may be performed in two steps.

First, a weight coefficient of each index type is calculated according to the degree of importance of each index type.

In practice, how to evaluate the comprehensive benefits of the pumped storage power station affects the future development direction of the pumped storage power station. There are many evaluation methods for comprehensive benefits, and the AHP method is widely applied at present. However, when the method is used for processing the problems of numerous factors and large scale, the problem that the judgment matrix is difficult to meet the requirement of consistency easily occurs, and the judgment matrix is often difficult to share. The larger the order number of the judgment matrix is, the more the number of times of pairwise comparison judgment between elements is, and the more the consistency is difficult to achieve. Thus, in one embodiment, the G1 method is employed to circumvent these potential problems. When the G1 method is used, the following two concepts must be clarified first.

Definition 1: if the evaluation index x_iGreater (or not less) than x relative to some evaluation criterion (or goal)_jWhen it is, then it is marked as x_i＞x_j。

Definition 2: if the evaluation index x₁,x₂,…,x_mHaving a relation x with respect to some evaluation criterion (or target)₁ ^*,x₂ ^*,…,x_m ^*In the meantime, the evaluation indexes are called to establish an order relation according to the' >. Wherein, { x_i ^*And (5) the sequential relation ">" is used for the ith assessment index after the sequence is arranged, and i is 1,2.

Therefore, the calculation of the weight coefficient for each index type is performed as follows.

And (1) determining the order relation of the importance degrees of the types of the indexes.

For the evaluation index set { x₁,x₂…x_mThe order relationship can be established according to the following procedures:

ask expert (or decision maker) to work on the index set { x₁,x₂…x_mOne index which is considered to be most important is selected and marked as x₁ ^*；

Please ask the expert (or decision maker) to select the most important index from the remaining m-1 indexes, and mark it as x₂ ^*；

Repeating the steps until the expert (or the decision maker) selects one index which is considered to be most important from the rest m- (k-1) indexes and marks the index as x_k ^*；

The remaining evaluation index after m-1 times of selection is x_m ^*；

Thus, a unique order relationship x is determined₁*＞x₂*＞…＞x_m ^*。

And (2) determining the relative importance degree between the adjacent index types based on the determined order relation.

Adjacent index x_k-1And x_kCan be used as the ratio of the importance of_kIs shown as

Wherein, w_kIs the weight of the kth index, k ═ m, m-1. And calculating the relative importance degree of each index according to the order relation among the indexes.

The following table lists examples of relative degrees of importance between adjacent indicators.

TABLE 1 relationship of relative importance between indexes

rkValue of	Means of
		1.0	Index xk-1And index xkOf equal importance
1.2	Index xk-1Ratio xkOf slight importance
		1.4	Index xk-1Ratio xkOf obvious importance
1.6	Index xk-1Ratio xkOf strong importance
		1.8	Index xk-1Ratio xkOf extreme importance

When x is₁,x₂,…,x_mWhen there is an ordered relationship between them, then the sum must satisfy r_k-1And r_kMust satisfy

And (3) calculating the weight coefficient of each index type according to the relative importance degree.

If r is given by an expert (or decision maker)_kSatisfy the requirement of

The weight w of the index k (k ═ m) is then_mIn order to realize the purpose,

and w_k-1＝r_kw_kAnd k is m, m-1 … 3,2, so that the weights of all evaluation indexes are obtained.

In one embodiment, the above steps are adopted to calculate the weighting coefficients of the economic index, the technical index, the social index and the environmental index.

Further, the first weight of each index in each index type is determined by combining the weight coefficient of each index type.

In one embodiment, for each index type, the initial weight of each index is determined according to the importance degree of each index. The process of determining the initial weight of each indicator is consistent with the step of calculating the weight coefficient of each indicator type, and reference may be made to the above related steps, which are not described herein again.

Then, the product of the weight coefficient of each index type and the initial weight of each index corresponding to the index type is used as the first weight of each index in each index type.

Subsequently, in step S240, a second weight of each index is calculated based on the entropy weight method.

Because the measurement units of each index are not uniform, before the indexes are used for calculating the comprehensive index, standardization treatment is carried out, namely the absolute value of each index is converted into a relative value, so that the homogenization problem of each index value with different qualities is solved.

Firstly, aiming at the measured value of each index, normalization processing is respectively carried out on each index to obtain the measured value after each index is normalized.

In addition, the positive indicators and the negative indicators have different meanings (the higher the positive indicator is, the better the negative indicator is), so that different algorithms are needed for the positive indicators and the negative indicators to perform data standardization during normalization:

the forward direction index is as follows:

negative direction index:

in the above formula, x_ij' represents x_ijNormalized value of (a), x_ijThe ith measured value, i ═ 1, …, n, representing the jth index.

And secondly, respectively calculating the entropy of each index based on the measured value after normalization of each index.

The entropy value of the j index is calculated by the following formula:

wherein,

thirdly, respectively determining a second weight of each index according to the entropy of each index, wherein the second weight is calculated according to the following mode:

wherein d is_j＝1-e_j,j＝1,…,m (25)

In the formula, ω_jSecond weight, e, representing the j-th index_jEntropy of j-th index, d_jInformation entropy redundancy representing jth indexM represents the total number of indices, and n represents the total number of measured values corresponding to each index.

Subsequently, in step S250, a third weight corresponding to each index is determined by combining the first weight and the second weight.

For each index type, let w_jIs the third weight of the jth index, and is w_jExpressed as a first weight

And a second weight

The linear combination of (a):

in the formula, the coefficient a is used for adjusting the degree of influence of subjective and objective factors on the overall weight coefficient, the value range is 0-1, and the value of a can be selected as required. In one embodiment, the value a is 0.5.

Then, in step S260, the index values corresponding to the indexes and the third weight are combined to determine a score representing the benefit of the pumped-storage power station.

In an embodiment according to the invention, the benefit score s of a pumped storage power station is calculated by_i，

Scoring p by the jth sub-indicator of the ith indicator_ijIt can be derived that:

in the formula, q_ijIs the index value of the j index under the i index type, w_ijIn the embodiment according to the present invention, n represents the number of index types, and n is 4.

In summary, according to the method 200 of the present invention, on one hand, the working characteristics of the pumped storage power station are considered, and the indexes are selected from the four aspects of economy, technology, society and environment to comprehensively evaluate the pumped storage power station; on the other hand, the combined weighting method is adopted to weight each index, and the subjective weighting method and the objective weighting method are logically and organically combined together, so that the final evaluation result can truly reflect the operation state of the pumped storage power station.

The method 200 is used for comprehensively evaluating the economy and the environmental protection of the pumped storage power station so as to verify the operation benefit of the pumped storage power station.

In one embodiment, the tung-cypress pumped storage power station in east China, the Shenzhen pumped storage power station in south China and the Huilong pumped storage power station in China are selected as evaluation objects, and the comprehensive benefits of the pumped storage power station are analyzed.

Tung-cypress pumped storage power station

(1) Overview of the engineering

The King-tree pumped storage power station is located in the country of Suxia countryside of Tiantai county in Zhejiang province, 7 kilometers away from the Tiantai county, 150 kilometers and 94 kilometers away from Hangzhou and Ningbo straight lines, 150 kilometers away from the Qin mountain nuclear power station, and 100 kilometers away from various large fire power plants on the coast planned by Zhejiang, and the site selection location is superior. After the power station is built, the problems of small water-electricity specific gravity and insufficient peak regulation capacity of the power grid in east China can be solved, and the power station plays an important role in peak regulation of the power grid in east China and safe and economic operation of the power grid. 4 vertical shaft single-stage reversible mixed flow type pumped storage units with 30 ten thousand kW are installed in the Tuebi pumped storage power station, the total single unit capacity is 120 ten thousand kW, and the three-seat installation is a pumped storage power station with more than 100kW in China after the pumped storage power station in Guangzhou and Tian wasteland. The power station operates in a daily regulation mode, the annual generating capacity is 21.18 hundred million kWh, the annual pumping electric quantity is 28.13 hundred million kWh, and the comprehensive efficiency is 75.3%. The static investment of the project is 31.18 million yuan, the total dynamic investment is 41.93 million yuan, wherein the internal investment is 28.84 million yuan, and the external investment is 3494.58 million yuan. The project is built by joint ventures of Huadong electric power group company (accounting for 10% of the stock), Zhejiang electric power company (accounting for 25% of the stock), Shanghai electric power company (accounting for 17% of the stock), Jiangsu international trust investment company (accounting for 13% of the stock), Zhejiang electric power saving development company (accounting for 10% of the stock) and Tiantai hydropower comprehensive development company (accounting for 5% of the stock).

The upper reservoir of the power station utilizes a tung-cypress reservoir which is built for many years, the rain collecting area above the dam site is 60.9 square kilometers, and the reservoir capacity is 1231.63 ten thousand cubic meters. The lower reservoir is formed by damming a hundred-longxi valley land, the rain collecting area above the dam site is 21.4 square kilometers, the average annual flow rate of many years is 442 kilometres, the water source of a power station is abundant, the average drop of the two reservoirs is 260 meters, and the average drop is far greater than the requirements of initial water storage and supplement of evaporation and leakage of the reservoir.

(2) Determination of benefits evaluation index weight of Turpinia chinensis pumped storage power station

1) Comprehensive benefit index of tung-cypress pumped storage power station

TABLE 2 Turpinia chinensis pumped storage power station comprehensive benefit index

2) First weight of each index of Turpinia chinensis pumped storage power station

The comprehensive benefit evaluation index system of the pumped storage power station consists of an economic index B₁Technical index B₂Social index B₃And an environmental index B₄The four parts are formed. First, the experts rank them separately and assign their respective relative importance, with the following results:

the order relationship is: b is₁＞B₃＞B₄＞B₂

The relative importance of the adjacent indicators is: r is₂＝1.4，r₃＝1.2，r₄＝1.2

Computing environmental index B₄Weight coefficient:

from the formula w_k-1＝r_kw_kThe weight coefficients of other 3 indexes can be obtained, so that the economic index B of the pumped storage power station can be known₁Technical index B₂Social index B₃Environmental index B₄Has a weight coefficient of w_B＝(0.3564，0.1768，0.2546，0.2122)。

Next, a first weight of each index corresponding to each index type is calculated.

Taking the economic index type as an example, determining the sequence relation of 7 indexes (the sequence relation is peak load and valley load regulation benefit > frequency modulation benefit > phase modulation benefit > capacity benefit > electric quantity benefit > accident standby benefit > black start benefit), then assigning values to adjacent indexes, and obtaining the weight of each index as

Similarly, for the technical index types, the sequence relation is that the unit availability factor is greater than the starting success rate and the annual starting times is greater than the annual frequency qualification rate, and the weight of each index obtained by calculation is

For the social index types, the order relation is that the employment effect is greater than the influence on related industries, and the weight of each index is obtained through calculation

For the environmental index types, the order relation is that the pollutant discharge amount is reduced, the clean energy consumption level is improved, and the influence on soil and vegetation is improved, and the weight of each index is calculated to be

Binding w_BAnd

the first weight corresponding to each index under each index type can be correspondingly calculated. Taking the peak and valley load adjusting benefit as an example, the product of 0.3564 multiplied by 0.3107 is the first weight of the peak and valley load adjusting benefit.

3) Second weight of each index of Turpinia chinensis pumped storage power station

According to the formula and the specific numerical calculation of each index, the weight of each benefit of the tung-cypress pumped storage power station is as follows: the second weights of the peak load benefit, the frequency modulation benefit, the phase modulation benefit, the standby benefit, the black start benefit, the electric quantity benefit and the capacity benefit of the economic index are respectively (0.201, 0.175, 0.145, 0.106, 0.074, 0.149 and 0.150); the second weights of the unit availability factor, the starting success rate, the annual starting times and the annual frequency qualification rate of the technical indexes are respectively (0.224, 0.250, 0.236 and 0.290); the employment effect of the social index and the second weight of the influence on the related industries are respectively (0.470, 0.530); the third weights of the environmental index for reducing pollutant discharge, affecting soil and vegetation and improving the clean energy consumption level are (0.660, 0.101 and 0.239), respectively.

(3) Comprehensive benefit index comprehensive score of tung and cypress pumped storage power station

And (3) calculating the comprehensive score of the Turpinia elegans pumped storage power station according to the formulas (26) and (27).

Shenzhen pumped storage power station

(1) Overview of the engineering

The Shenzhen pumped storage power station is located between the Shenzhen salt field region and the Dragon sentry region, is about 20 kilometers away from the center of the Shenzhen market, is about 25 kilometers away from the Hongkong, Dayawan nuclear power station and the Ling Australian nuclear power station, and is located in the power load center of the Guangdong. Meanwhile, the device is a drop point for sending the western and east electric power and a connection point for a Guangdong power grid. The installed capacity of the power station is 4 multiplied by 300MW, the estimated static investment is 49.48 hundred million yuan, the dynamic investment is 59.79 hundred million yuan, and the construction period of the main engineering is 69 months. The Shenzhen pumped storage power station hub project mainly comprises auxiliary projects such as an upper reservoir, a lower reservoir, a water delivery power generation system and an underground factory building cavern group. The maximum dam height of the main dam of the upper reservoir is 55 meters, the reservoir capacity is adjusted to be 825 ten thousand square meters, the upper reservoir area is positioned in a small three continents basin on the north side of the salt pan area, and the floor area is 64 ten thousand square meters; the lower reservoir is formed by expanding and reconstructing a bronze gong diameter reservoir built in a dragon hillock area, the maximum dam height of the main dam is 50 meters, and the reservoir capacity is adjusted to 1625 ten thousand square. The lower reservoir area is located in a gong diameter reservoir of a cross post street, and the floor area is 99 ten thousand square meters; the length of the connecting road between the upper and lower storehouses is 10 kilometers. Four vertical shaft single-stage reversible mixed flow type units with 30 ten thousand kW are built in the project, the total installed capacity is 120 ten thousand kW, the average water head is 448 meters, and the power stations are respectively connected to the Shenzhen transformer substation and the Yuanfeng transformer substation through 4-circuit 220kV outgoing lines. The power station regulation performance is daily regulation, the daily regulation full-sending time is 6.37h, and the accident standby full-sending time is 1 h. The annual average water pumping power consumption of the power station is 19.55 hundred million kWh, and the annual average power generation is 15.11 hundred million kWh.

The power station mainly undertakes the tasks of peak regulation, valley filling, frequency modulation, phase modulation and emergency standby of the power system. After the system is built, the power supply pressure in the Shenzhen region can be relieved, the peak regulation amplitude of thermal power and western power is reduced, the nuclear power and new energy access system is promoted, the environmental quality is improved, the safe, reliable and high-quality power supply is ensured, and the sustainable development of social economy is promoted.

(2) Shenzhen pumped storage power station comprehensive benefit index

TABLE 3 Shenzhen pumped storage power station comprehensive benefit index

(3) Shenzhen pumped storage power station comprehensive benefit index comprehensive score

The calculation of the third weight and the comprehensive score of the pumped storage power station has been developed in the previous section, and is not described herein again.

Through processing the related data of the Shenzhen pumped storage power station, the comprehensive benefit score of the Shenzhen pumped storage power station can be finally calculated to be 89.13 points.

Dragon pumped storage power station

(1) Overview of the engineering

The Nanyang Huilong pumped storage power station project is located near a 16-kilometer Yuzhuang in northeast of the southern summons of Henan province, and the power station is arranged at the upstream of the Huilong ditch and is close to the watershed of Jianghuai and 207 national roads to pass between an upper warehouse and a lower warehouse, so that the traffic is convenient. The station is located in a Funiu mountain area, the rainfall is abundant, the mountain high valley is deep, the distance from the load center to the south-Yang city is 70 kilometers, and the distance from the load center to the Yunyang 220KV transformer station is 28 kilometers. Has good geographical conditions for building pumped storage power stations. The lower reservoir is positioned near a Yuzhuang village at an outlet of a canyon section of a nine-river, the area of a controlled basin above a dam site is 8.625 square kilometers, the normal water storage level is 502 meters, the check flood level is 506.40 meters, and the corresponding total reservoir capacity is 168 ten thousand cubic meters; the branch ditch stone on the left bank of the back dragon ditch hits the ditch depression close to the watershed and is a small water collecting basin with a normal water storage level of 899 meters and a corresponding storage capacity of 118 ten thousand cubic meters. The total installed capacity of the power station is 120MW, the annual average generated energy is 20032 ten thousand kWh, the annual pumping power consumption is 27120 ten thousand kWh, and the comprehensive efficiency of the power station is 73.9%.

The power station has a single engineering task, is a peak regulation power station specially designed for solving the problem of peak regulation of power supply in the south-yang region, simultaneously considers the requirement of local water use, and provides irrigation water for 15 mu of river beach land in the Yuzhuancun under the dam by a lower reservoir. The power station is a first pumped storage power station constructed by a power grid in Henan, and the construction of the power station can relieve the peak load regulation pressure of the power grid in Henan to a certain extent.

(2) Comprehensive benefit index of dragon-back pumped storage power station

TABLE 4 comprehensive benefits index of Dragon pumped storage power station

(3) Comprehensive benefit index comprehensive score of dragon-back pumped storage power station

The calculation method of the comprehensive benefits of the pumped storage power station is not repeatedly developed any more, and the comprehensive score of the dragon-shaped pumped storage power station is 75.05 points through calculation.

Analysis of technical and economic comprehensive evaluation results of pumped storage power station

From the final score, the pumped-storage power station in south china scores 89.13 points, the comprehensive benefit score is higher than 85.16 points of the pumped-storage power station in east china, the overall benefit of the pumped-storage power station in south china is relatively weak, and the score is 75.05 points, which indicates that the pumped-storage power stations in three areas are unbalanced in development, the south china obtains great economic benefit according to good geographic advantages and technical levels of the south china, the pumped-storage power station in south china has complete functions in an electric power system and plays an irreplaceable important role, and the pumped-storage power stations in east china and China need to further widen the functions of the south china.

(1) Evaluation of economic benefit

According to the comprehensive benefit evaluation obtained in the above section, from the weight vector, the peak load regulation benefit index weight brought by the construction of the pumped storage power station is larger, mainly because the pumped storage power station as a special power supply in the system cannot simply perform benefit evaluation by the benefit evaluation index of the power plant, and the benefit condition of the pumped storage power station should be investigated from the overall level of the system. Meanwhile, the matched construction of the pumped storage power station and power plants such as wind power and nuclear power can solve the problem of peak shaving flexibility of wind power and nuclear power to a great extent. From the evaluation results, the three pumped storage power stations play a good role in peak load regulation and valley filling, and play a key role in the aspect of clean energy consumption. However, the technical level of the Huazhong pumped-storage power station needs to be improved continuously, and the technology does not fully play the role of the power station in the system.

(2) Evaluation of technical benefit

The technical benefit index weights of the three pumped storage power stations are relatively balanced, the frequency qualification rate, the starting success rate and the annual operation hours are relatively high, and the three pumped storage power stations are relatively stable. However, the water accumulation efficiency of the south china pumped-storage power station is relatively higher, mainly because the function of the station in the power grid is more important than that of the other two regions. The pumped storage power station in China has single function and minimum annual starting times, and needs to be functionally modified. Therefore, the small annual starting times are the main factors for restricting the improvement of the technical benefits of the pumped storage power station. Generally, the unit operation level of the pumped storage power station is related to time, the unit state of the tung-cypress pumped storage power station is not stable after the tung-cypress pumped storage power station is put into operation for one year, so that the index value is low, but the operation index of the pumped storage power station has great improvement potential. With the increasing improvement of the power supply quality of the power grid, the pumped storage power station is required to have higher availability and starting success rate, so that the management level of the pumped storage power station is improved, the operation state of pumped storage is gradually improved, and the future effort direction of the pumped storage power station is provided.

(3) Evaluation of social benefits

From the index value, the pumped storage power station in south China has relatively high social benefit, mainly has large scale, and the social benefit in China and east China is relatively low. Specifically, the effects of employment in the influence of socio-economic development, promotion of development of related industries and improvement of investment environment are good, the influence of production and living environment in the influence of social environment is large, the attitude of local government and masses to projects is also the key of power station construction, and the project construction period can provide additional income for local residents to solve part of employment. But also can have certain adverse effect on the life of residents, for example, 799 farmers in administrative villages such as the feet of the greens of the lower reservoir area of the Chinese arborvitae pumped storage power station, the husband and the like need to move to the creek wasteland. From the evaluation result, the pumped storage power station controls the adverse effect of the society in the construction within the minimum range, thereby generating more positive social benefit and being worth of construction, study and popularization of similar projects.

(4) Evaluation of environmental benefit

From the evaluation results, the three pumped storage power stations have high environmental protection performance and small damage to the environment, while the pumped storage power station in south China has high benefit and low promotion level of emission reduction and clean energy consumption in China. Although the environmental benefits of pumped storage power stations are good, the problems in them are not negligible. In particular, the pumped storage power station has a great influence on water environment, vegetation and land, such as the influence of drinking water quality and quantity, felling or value shifting fruit trees, expropriating partial farmlands and the like. Among the four indexes of environmental influence, the relative importance degree of the water environment and vegetation in the indexes is the highest, and the water environment and vegetation have higher membership degree in the general grade, so that the membership degree in the comprehensive evaluation result of environmental benefit is finally influenced and determined. Therefore, corresponding environmental protection measures are perfected while construction of the pumped storage power station is strengthened, and the method is a necessary means for reducing influence of construction of the pumped storage power station on the environment and improving environmental benefits. From the aspect of resource utilization, the aspect of reducing environmental pollution is better than the aspect of promoting the sustainable development of water and electricity, the aspect of improving the energy utilization rate is second to the two aspects, and the higher membership of the three determines the comprehensive evaluation result of the sustainable development. From the long-term development perspective, pumped storage power stations promote sustainable development and have great advantages compared with alternative power stations.

It should be appreciated that in the foregoing description of exemplary embodiments of the invention, various features of the invention are sometimes grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the disclosure and aiding in the understanding of one or more of the various inventive aspects. However, the disclosed method should not be interpreted as reflecting an intention that: that the invention as claimed requires more features than are expressly recited in each claim. Rather, as the following claims reflect, inventive aspects lie in less than all features of a single foregoing disclosed embodiment. Thus, the claims following the detailed description are hereby expressly incorporated into this detailed description, with each claim standing on its own as a separate embodiment of this invention.

Those skilled in the art will appreciate that the modules or units or components of the devices in the examples disclosed herein may be arranged in a device as described in this embodiment or alternatively may be located in one or more devices different from the devices in this example. The modules in the foregoing examples may be combined into one module or may be further divided into multiple sub-modules.

Those skilled in the art will appreciate that the modules in the device in an embodiment may be adaptively changed and disposed in one or more devices different from the embodiment. The modules or units or components of the embodiments may be combined into one module or unit or component, and furthermore they may be divided into a plurality of sub-modules or sub-units or sub-components. All of the features disclosed in this specification (including any accompanying claims, abstract and drawings), and all of the processes or elements of any method or apparatus so disclosed, may be combined in any combination, except combinations where at least some of such features and/or processes or elements are mutually exclusive. Each feature disclosed in this specification (including any accompanying claims, abstract and drawings) may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise.

Furthermore, those skilled in the art will appreciate that while some embodiments described herein include some features included in other embodiments, rather than other features, combinations of features of different embodiments are meant to be within the scope of the invention and form different embodiments. For example, in the following claims, any of the claimed embodiments may be used in any combination.

Furthermore, some of the described embodiments are described herein as a method or combination of method elements that can be performed by a processor of a computer system or by other means of performing the described functions. A processor having the necessary instructions for carrying out the method or method elements thus forms a means for carrying out the method or method elements. Further, the elements of the apparatus embodiments described herein are examples of the following apparatus: the apparatus is used to implement the functions performed by the elements for the purpose of carrying out the invention.

As used herein, unless otherwise specified the use of the ordinal adjectives "first", "second", "third", etc., to describe a common object, merely indicate that different instances of like objects are being referred to, and are not intended to imply that the objects so described must be in a given sequence, either temporally, spatially, in ranking, or in any other manner.

While the invention has been described with respect to a limited number of embodiments, those skilled in the art, having benefit of this description, will appreciate that other embodiments can be devised which do not depart from the scope of the invention as described herein. Furthermore, it should be noted that the language used in the specification has been principally selected for readability and instructional purposes, and may not have been selected to delineate or circumscribe the inventive subject matter. Accordingly, many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the appended claims. The present invention has been disclosed in an illustrative rather than a restrictive sense, and the scope of the present invention is defined by the appended claims.

Claims (10)

1. A method of calculating pumped-hydro energy storage power plant profitability comprising the steps of:

determining at least one index type representing the benefit of the pumped storage power station and at least one index contained in each index type;

calculating a corresponding index value based on the determined index;

calculating a first weight of each index based on the index type;

calculating a second weight of each index based on an entropy weight method;

determining a third weight corresponding to each index by combining the first weight and the second weight;

and determining the value of the benefit representing the pumped storage power station by combining the index values corresponding to the indexes and the third weight.

2. The method of claim 1, wherein the metric types include at least one or more of the following types: economic index, technical index, social index and environmental index.

3. The method of claim 1 or 2, wherein the calculating of the first weight of each index based on the index type comprises:

calculating a weight coefficient of each index type according to the importance degree of each index type;

and determining the first weight of each index in each index type by combining the weight coefficient of each index type.

4. The method of claim 3, wherein the determining the first weight of each metric in each metric type in combination with the weight coefficient of each metric type comprises:

determining the initial weight of each index according to the importance degree of each index;

and taking the product of the weight coefficient of each index type and the initial weight of each index under the index type as the first weight of each index in each index type.

5. The method according to any one of claims 1-4, wherein the step of calculating a second weight for each indicator based on entropy weight comprises:

respectively carrying out normalization processing on each index aiming at the measured value of each index to obtain the measured value of each index after normalization;

respectively calculating the entropy of each index based on the measured value after each index is normalized;

and respectively determining the second weight of each index according to the entropy of each index.

6. The method of claim 5, wherein the second weight is calculated as follows:

wherein d is_j＝1-e_j,j＝1,···,m

In the formula, ω_jSecond weight, e, representing the j-th index_jEntropy of j-th index, d_jThe information entropy redundancy of the jth index is shown, m represents the total number of indexes, and n represents the total number of measured values corresponding to each index.

7. The method as claimed in claim 3, wherein the calculating of the weight coefficient for each index type according to the degree of importance of each index type comprises:

determining the order relation representing the importance degree of each index type;

determining a relative degree of importance between adjacent index types based on the order relationship;

and calculating the weight coefficient of each index type according to the relative importance degree.

8. The method of claim 2, wherein,

the economic indicator types include at least one or more of the following indicators: peak and valley load regulation benefit, frequency modulation benefit, phase modulation benefit, standby benefit, black start benefit, electric quantity benefit and capacity benefit;

the technical indicator type includes at least one or more of the following indicators: the unit availability factor, the starting success rate, the annual starting times and the annual frequency qualification rate;

the social index type at least comprises employment effects, and the employment effects comprise unit investment employment number and direct employment effects; and

the environmental indicator types include at least one or more of the following indicators: pollutant discharge, water and soil loss rate, and influence on clean energy consumption.

9. A computing device, comprising:

one or more processors; and

a memory;

one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors, the one or more programs comprising instructions for performing any of the methods of claims 1-8.

10. A computer readable storage medium storing one or more programs, the one or more programs comprising instructions, which when executed by a computing device, cause the computing device to perform any of the methods of claims 1-8.

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