Pumped storage power station income measuring and calculating method based on whole life cycle

Abstract

The invention discloses a pumped storage power station income measuring and calculating method based on a full life cycle, and the method comprises the steps: 1, taking the rated installed capacity of a power station as a reference, employing an operation period pricing method to check the capacity electricity price of stages, and obtaining the capacity income through the capacity electricity price; 2, according to the peak-valley electricity price difference and the charging and discharging strategy, the net difference between the power generation income and the water pumping cost in the whole life cycle is calculated and serves as the electric energy income; 3, calculating the total income of the whole cycle according to frequency modulation and standby auxiliary service types in a subentry manner; and accurate evaluation of the full-life-cycle income of the pumped storage power station is realized.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of pumped storage power station benefit evaluation, and particularly relates to a pumped storage power station benefit calculation method based on a whole life cycle. BACKGROUND

[0002] With the deepening of the electric power marketization reform, as an important regulating resource of the power grid, the benefit mode of the pumped storage power station has changed from the traditional single grid-connected electricity price mode to the multi-dimensional marketization benefit mode of capacity benefit, energy benefit and auxiliary service benefit. However, the existing pumped storage power station benefit calculation method has the following shortcomings:

[0003] (1) The dynamic correlation of marketization parameters such as capacity price, peak-valley price difference and auxiliary service price is not fully considered in combination with the electric power marketization pricing mechanism;

[0004] (2) The calculation boundary of the whole life cycle cost and benefit is fuzzy, and a systematic phased calculation model is not formed;

[0005] (3) The comprehensive evaluation of the whole cycle profitability and cost benefit is lacking, and it is difficult to meet the project investment decision-making needs under the marketization condition.

[0006] Therefore, a benefit calculation method that can integrate marketization parameters and cover the whole life cycle is urgently needed to provide a scientific basis for the investment construction, operation management and market participation of the pumped storage power station. SUMMARY

[0007] The technical problem to be solved by the present application is to provide a pumped storage power station benefit calculation method based on a whole life cycle, to realize the accurate evaluation of the whole life cycle benefit of the pumped storage power station by constructing a "capacity-energy-auxiliary service" three-dimensional integrated benefit calculation system, and to solve the problem that the existing calculation method does not match the marketization demand.

[0008] The technical scheme of the present application is:

[0009] A pumped storage power station benefit calculation method based on a whole life cycle, the method comprising:

[0010] Step 1, taking the rated installed capacity of the power station as a benchmark, using the operating period pricing method to determine the phased capacity price, and obtaining the capacity benefit through the capacity price;

[0011] Step 2, calculating the net difference between the power generation benefit and the pumping cost in the whole life cycle according to the peak-valley price difference and the charging and discharging strategy, as the energy benefit;

[0012] Step 3, calculating the total benefit in the whole cycle according to the frequency modulation and standby auxiliary service type.

[0013] The operating period pricing method comprises:

[0014] The operating period pricing method comprises:

[0015] ;

[0016] ;

[0017] ;

[0018] Wherein: is the net cash flow in the kth year; n is the total operating period of the power station; R is the internal rate of return of the capital; E is the effective on-grid power; P1 is the on-grid power price; C is the effective on-grid capacity; P2 is the capacity price; I e is the cash inflow; O is the cash outflow.

[0019] The method for calculating the net difference between the power generation income and the pumping cost in the whole life cycle comprises:

[0020] The power energy income model under the condition of complete marketization is established: the model satisfies the power constraint and the energy and power conversion relationship constraint, and under the condition of complete marketization of the power market, the power energy income model is:

[0021] ;

[0022] Wherein: is the spot market power energy income, and t is the operation period; is the power during the power generation period, is the power market price during the power generation period; is the power during the pumping period, is the power market price during the pumping period.

[0023] The power constraint comprises: in any period, the pumped storage power station can only exist in one state, that is, the power generation and pumping states cannot be performed simultaneously, and the power generation and pumping power cannot exceed the rated power of the power station;

[0024] ;

[0025] Wherein: is the rated power of the pumped storage unit;

[0026] The energy and power conversion relationship constraint comprises: the conversion relationship between the energy stored by the pumped storage power station in each period and the pumping and power generation power is as follows:

[0027] ;

[0028] Wherein: Respectively, t, t-1 time effective energy storage power plant; Is pumped storage unit generation efficiency (%).

[0029] The method comprises the following steps:

[0030] The frequency modulation income is composed of capacity charge and mileage charge, the capacity charge is calculated based on the frequency modulation capacity and the capacity price, the mileage charge is determined in combination with the frequency modulation mileage price, the comprehensive frequency modulation index and the frequency modulation mileage; the standby income is composed of the reserved standby capacity charge and the actual calling power charge, and the calculation result is as follows:

[0031] ;

[0032] Wherein: Is the auxiliary service market income; Is the frequency modulation market income; Is the standby market income;

[0033] The frequency modulation market income is composed of capacity charge and mileage charge, and the calculation mode is as follows:

[0034] ;

[0035] Wherein: Is the frequency modulation capacity in t period; Is the frequency modulation capacity price; Is the frequency modulation mileage price in t period; K is the comprehensive frequency modulation index; Is the frequency modulation mileage in t period;

[0036] The standby market income is composed of the reserved standby capacity charge and the actual calling power charge, and the calculation mode is as follows:

[0037] ;

[0038] Wherein: Is the standby capacity in t period; Is the standby capacity price; Is the spot market electricity price in t period; Is the standby capacity called in t period.

[0039] The present application has the beneficial effects:

[0040] Compared with the prior art, the application fully combines the power market environment, considers dynamic factors such as spot market prices and auxiliary service market rules, so that the calculation result is more in line with the actual market situation and has higher accuracy. By introducing a peak-valley electricity price difference dynamic model and coupling the charging / discharging strategy optimization, the influence of spot market price fluctuations on electricity energy income can be captured in real time, and the calculation accuracy is significantly improved. The “operating period pricing method” is used to determine the capacity price, and the after-tax internal rate of return of the capital is not less than 6.5%, which ensures the reasonable return of the investor and also takes into account the affordability of the end user price, providing a direct and quantifiable basis for the government department to determine the pumped storage capacity price.

[0041] The application constructs a “capacity-electricity energy-auxiliary service” three-dimensional integrated income calculation system, and takes Guizhou Qianan pumped storage power station as an example for empirical verification, realizes the accurate evaluation of the whole life cycle income of the pumped storage power station, provides a scientific basis for the investment decision and operation strategy of the pumped storage power station, helps to improve the economic benefit and market competitiveness of the power station, and promotes the healthy development of the pumped storage industry. DETAILED DESCRIPTION

[0042] A pumped storage power station income calculation method based on the whole life cycle, the method comprises:

[0043] Step 1, capacity income calculation: taking the rated installed capacity of the power station as the basis, the operating period pricing method is used to determine the phased capacity price, based on the cost compensation and reasonable income principle, the capital internal rate of return is used to discount the annual net cash flow in the operating period of the power station, and the capacity price of the power station is determined to realize the balance of the whole operating period cash flow, and the capacity income is obtained through the capacity price.

[0044] The operating pricing method calculation formula is:

[0045] ;

[0046] ;

[0047] Through the above formula, we obtain:

[0048] ;

[0049] Wherein: is the net cash flow (ten thousand yuan) in the kth year; n is the total operating period of the power station (years); R is the internal rate of return of the capital (%); E is the effective on-grid electricity (billion kilowatt hours); P1 is the on-grid electricity price (yuan / kilowatt hour); C is the effective on-grid capacity (ten thousand kilowatts); P2 is the capacity price (yuan / kilowatt); I eCFI is the cash inflow (ten thousand yuan), CFO is the cash outflow (ten thousand yuan).

[0050] Step 2, electricity energy benefit calculation: according to the peak-valley electricity price difference and the charging and discharging strategy, the net difference between the electricity generation benefit and the pumping cost in the whole life cycle is calculated as the electricity energy benefit. The electricity energy benefit model under the condition of complete marketization needs to meet the power constraint (the state of power generation and pumping is mutually exclusive in any period and the power does not exceed the rated power) and the energy and power conversion relationship constraint (considering the energy storage and pumping power conversion considering the unit power generation efficiency).

[0051] Under the condition of complete marketization of the electricity market, the electricity energy benefit model is:

[0052] ;

[0053] Wherein: CFE is the electricity energy benefit in the spot market (ten thousand yuan), t is the operation period; Pgen is the power in the power generation period (ten kilowatts), Pgen is the power in the power generation period (ten kilowatts), Pgen is the power in the power generation period (ten kilowatts), Pgen is the power in the power generation period (ten kilowatts),

[0054] (1) Power constraint. In any period, the pumped storage power station can only exist in one state, i.e. the power generation and pumping state cannot be carried out at the same time, and the power generation and pumping power cannot exceed the rated power of the power station.

[0055] ;

[0056] Wherein: Pgen is the power in the power generation period (ten kilowatts),

[0057] (2) Energy and power conversion relationship constraint. The conversion relationship between the energy stored by the pumped storage power station in each period and the pumping power is as follows:

[0058] ;

[0059] Wherein: CFE is the electricity energy benefit in the spot market (ten thousand yuan), t is the operation period; Pgen is the power in the power generation period (ten kilowatts),

[0060] Step 3, auxiliary service revenue calculation: calculate the total revenue of the whole cycle according to the main auxiliary service types such as frequency modulation, standby and the like. The frequency modulation revenue is composed of capacity fee and mileage fee. The capacity fee is calculated based on the frequency modulation capacity of the bid and the capacity price. The mileage fee is determined in combination with the frequency modulation mileage price, the comprehensive frequency modulation index and the frequency modulation mileage. The standby revenue is composed of reserved standby capacity fee and actual calling capacity fee. The calculation results are as follows:

[0061] ;

[0062] Among them: is the auxiliary service market revenue (ten thousand yuan); is the frequency modulation market revenue (ten thousand yuan); is the standby market revenue (ten thousand yuan).

[0063] (1) Frequency modulation market revenue. The revenue in the frequency modulation market is composed of capacity fee and mileage fee. The capacity fee is the fee paid to compensate for the reserved frequency modulation capacity of the unit. The mileage fee is determined according to the frequency modulation step in the actual frequency modulation process. The calculation method is as follows:

[0064] ;

[0065] Among them: is the frequency modulation capacity of the bid in t period (ten thousand kilowatts); is the frequency modulation capacity price (yuan / kilowatt); is the frequency modulation mileage price (yuan / kilowatt hour) in t period. K is the comprehensive frequency modulation index; is the frequency modulation mileage in t period (hundred million kilowatt hours).

[0066] (2) Standby market revenue. The standby auxiliary service fee is composed of reserved standby capacity fee and actual calling capacity fee. The calculation method is as follows:

[0067] ;

[0068] Among them: is the standby capacity of the bid in t period (ten thousand kilowatts); is the standby capacity price (yuan / kilowatt); is the spot market price (yuan / kilowatt) in t period; is the called standby capacity in t period (ten thousand kilowatts).

[0069] A kind of full life cycle based pumped storage power station revenue calculation method takes Guizhou Qianan pumped storage power station as an example to calculate the revenue of pumped storage power station. The specific steps are as follows:

[0070] Step 1, collect and organize the basic situation of Qian Nan Pumped Storage Power Station, including project construction scale, pumping / generating capacity, project life, investment situation, etc.

[0071] Qian Nan Pumped Storage Power Station has a total installed capacity of 1.5 million kilowatts, with 4 units of 375,000 kilowatts vertical shaft single-stage reversible mixed flow turbine generator units, daily power regulation reservoir capacity of 5.34 million cubic meters, total project investment of 966003 million yuan, among which construction investment is 844457 million yuan, engineering construction period is 8 years, normal operation period is 40 years, and calculation period is 48 years. LPR for more than 5 years is 4.3%, value-added tax, sales tax and additional tax, and income tax are considered according to the current relevant policies.

[0072] Combined with the overall power flow of Guizhou, the calculation and analysis of related regional power balance, and the analysis of the geographical location of the power station, Qian Nan Pumped Storage Power Station can not only absorb a large amount of surplus power in Qian Nan region during the period of large new energy generation, but also can act as peak power supply to provide reliable power for load center during peak load period. It has the dual role of charging when there is surplus and peak when there is lack. The pumping utilization hours of Qian Nan Pumped Storage Power Station can reach 1900 hours / year (about 5 hours / day of pumping), and the generating utilization hours can reach 1425 hours / year (about 4 hours / day of generating). The pumping and generating efficiency of pumped storage power station is 75%, and the pumping / generating capacity is 28.5 / 21.4 billion kilowatt-hours.

[0073] Step 2, according to the actual situation of Qian Nan Pumped Storage Power Station, capacity income is calculated.

[0074] ;

[0075] Where: n is the total operation period of the power station (years); R is the internal rate of return of capital (percent); E is the effective on-grid power (billion kilowatt-hours); P1 is the on-grid power price (yuan / kilowatt-hour); C is the effective on-grid capacity (ten thousand kilowatts); P2 is the capacity price (yuan / kilowatt); I e is other cash inflow (ten thousand yuan); O is cash outflow (ten thousand yuan).

[0076] According to the actual situation of Qian Nan Pumped Storage Power Station, the unit installed capacity price of Qian Nan Pumped Storage Power Station is 608 yuan / kilowatt, and the annual capacity electricity fee is about 912 million yuan. At the same time, through calculation, it is known that the unit installed capacity investment increases by 100 yuan per kilowatt, and the unit installed capacity price increases by about 11 yuan.

[0077] Step 3, according to the actual situation of Qian Nan Pumped Storage Power Station, the electricity quantity income is calculated. Under the condition of fully marketized electricity market, the electricity quantity income model is:

[0078] ;

[0079] Wherein: is the spot market energy revenue (ten thousand yuan), t is the operation period; , is the power (ten thousand kilowatts) and market price (yuan / kilowatt hour) of the generating period; , is the power (ten thousand kilowatts) and market price (yuan / kilowatt hour) of the pumping period.

[0080] The pumped hydroelectric power does not perform the power transmission and distribution price, does not bear the government fund and the additional, the pumped hydroelectric power, the grid-connected electricity price is settled according to the spot market price and the rule. According to the time-sharing clearing price data of Guizhou spot market, the peak period clearing price is 0.37 yuan / kilowatt hour, the pumping / pumping capacity is 28.5 / 21.4 billion kilowatt hours, and the annual electric energy net income is 0.40 billion yuan.

[0081] Step 4, according to the actual situation of Qianan pumped storage power station, auxiliary service market income is calculated. The value of auxiliary service mainly reflects the functions of frequency modulation, emergency standby, phase modulation and black start. Because the standby and phase modulation auxiliary service market scale is relatively small, the auxiliary service market income is mainly considered the frequency modulation and standby income. The income in the frequency modulation market is composed of Guizhou capacity cost and mileage cost. The capacity cost is the cost paid to compensate for the reserved frequency modulation capacity of the unit, and the mileage cost is determined according to the frequency modulation step in the actual frequency modulation process. The calculation method is as follows:

[0082] ;

[0083] Wherein: is the frequency modulation capacity (ten thousand kilowatts) in t period; is the frequency modulation capacity price (yuan / kilowatt); is the frequency modulation mileage price (yuan / kilowatt hour) in t period; K is the comprehensive frequency modulation index; is the frequency modulation mileage (billion kilowatt hours) in t period.

[0084] The standby auxiliary service fee is composed of the standby capacity cost and the actual calling capacity cost. The calculation method is as follows:

[0085] ;

[0086] Wherein: is the standby capacity (ten thousand kilowatts) in t period; is the standby capacity price (yuan / kilowatt); is the spot market price (yuan / kilowatt) in t period; The reserve capacity (10,000 kW) for the t period.

[0087] According to the historical frequency modulation auxiliary service market operation in Guizhou, the clearing price is 5.8-14.5 yuan / MW, the frequency modulation capacity compensation price is calculated as 10 yuan / MW, the frequency modulation mileage to frequency modulation capacity ratio is 3, and the standby fee is calculated according to the product of the clearing price, the winning capacity and the winning time. The annual auxiliary service market income is calculated to be 0.25~0.44 billion yuan.

Claims

1. A method for calculating the revenue of a pumped storage power station based on its entire life cycle, characterized in that: The method includes: Step 1: Based on the rated installed capacity of the power plant, determine the phased capacity tariff using the operating period pricing method, and obtain capacity revenue through the capacity tariff; Step 2: Calculate the net difference between power generation revenue and pumping cost over the entire life cycle based on the peak-valley electricity price difference and the charging and discharging strategy, and use this as the electricity revenue. Step 3: Calculate the total revenue for the entire cycle by category for frequency regulation and backup ancillary services.

2. The method for calculating the revenue of a pumped storage power station based on its entire life cycle, as described in claim 1, is characterized in that: The operating period pricing method includes: The formula for calculating operating pricing is: ； ； ； in: Net cash flow in year k; n is the total operating period of the power plant; R is the internal rate of return on equity; E is the effective on-grid electricity volume; P1 is the on-grid electricity price; C is the effective on-grid capacity; P2 is the capacity price; I e O represents cash inflow; O represents cash outflow.

3. The method for calculating the revenue of a pumped storage power station based on its entire life cycle, as described in claim 1, is characterized in that: Methods for calculating the net difference between power generation revenue and pumping costs over the entire life cycle include: Establish an electricity revenue model under fully market-based conditions: The model satisfies power constraints and energy-power conversion relationship constraints. Under fully market-based electricity market conditions, the electricity revenue model is as follows: ； in: For spot market electricity revenue, t is the operating time; Power generation during the power generation period The electricity market price during the power generation period; This refers to the power output during the pumping period. The electricity market price during the pumping period.

4. The method for calculating the revenue of a pumped storage power station based on its entire life cycle, as described in claim 3, is characterized in that: The power constraints include: at any given time, a pumped storage power station can only exist in one state, that is, power generation and pumping cannot be carried out simultaneously, and the power generation and pumping power cannot exceed the rated power of the power station. ； in: This refers to the rated power of the pumped storage unit. The energy-power conversion constraint includes the following: the conversion relationship between the energy stored in the pumped storage power station and the pumped power generated in each time period is as follows: ； in: These represent the effective stored energy of the power station at times t and t-1, respectively. The power generation efficiency (%) of the pumped storage unit.

5. The method for calculating the revenue of a pumped storage power station based on its entire life cycle, as described in claim 1, is characterized in that: The method for calculating the total revenue over the entire lifecycle by category based on frequency regulation and backup ancillary service types includes: Frequency regulation revenue consists of capacity fees and mileage fees. Capacity fees are calculated based on the awarded frequency regulation capacity and capacity price, while mileage fees are determined by combining the frequency regulation mileage price, comprehensive frequency regulation indicators, and frequency regulation mileage. Reserve revenue consists of reserved reserve capacity fees and actual electricity usage fees, calculated as follows: ； in: For ancillary service market revenue; For revenue from the FM market; For the benefit of the backup market; FM market revenue consists of capacity fees and mileage fees, calculated as follows: ； in: The frequency modulation capacity won in time period t; Price for frequency modulation capacity; t represents the price of frequency regulation mileage cleared during time period t; K represents the comprehensive frequency regulation index. The frequency modulation mileage during time period t; The revenue from the standby market consists of the cost of reserved standby capacity and the cost of actual electricity usage, calculated as follows: ； in: The reserve capacity won in time period t; Price for spare capacity; The spot market electricity price for period t is the price at which the market clears out. This refers to the spare capacity allocated during time period t.

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