CN111525603A - BESS (beam-off service) -assisted thermal power generating unit frequency modulation and peak regulation optimization method - Google Patents
BESS (beam-off service) -assisted thermal power generating unit frequency modulation and peak regulation optimization method Download PDFInfo
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Abstract
The invention discloses a BESS (beam-assist system) -based thermal power generating unit frequency modulation and peak regulation optimization method, which comprises the following steps of: establishing a cost model of BESS auxiliary frequency modulation peak regulation based on a full life cycle theory; establishing a yield model of BESS auxiliary frequency modulation peak shaving, including establishing a BESS frequency modulation yield model considering unit loss reduction, a BESS peak shaving yield model considering investment delay and a BESS recovery yield model; constructing a dynamic investment recovery period, investment profitability and net present value evaluation index calculation model based on the cost model and the profit model and solving; and establishing a frequency modulation peak regulation optimal scheme of the thermal power generating unit based on the solving result. The BESS auxiliary frequency modulation peak shaving can improve the economic benefit of a thermal power plant, the yield of the BESS auxiliary frequency modulation peak shaving is fully mined by the BESS auxiliary-based thermal power plant frequency modulation peak shaving optimization method disclosed by the invention, the actual cost and the real value of the BESS auxiliary frequency modulation peak shaving are scientifically reflected, and a reference is provided for the operation strategy formulation of an auxiliary service market mechanism.
Description
Technical Field
The invention relates to the technical field of energy storage systems, in particular to a BESS (beam-assist system) -based thermal power generating unit frequency modulation and peak regulation optimization method.
Background
Under the dual pressure of energy crisis and environmental pollution, renewable energy represented by wind power and photovoltaic is rapidly developed, the power generation uncertainty brings a plurality of challenges to the operation of a power grid, the frequency modulation and peak shaving problems are particularly prominent, and in order to improve the flexibility of power supply side adjustment, the nation adopts the measures of building peak shaving power supplies such as gas and water power, developing flexibility modification of coal-fired units, building energy storage systems and the like; due to the rapid development of large-scale battery energy storage technology and the excellent regulation performance of energy storage, the attention is paid to more and more relieving the frequency modulation and peak regulation pressure of a power grid through an energy storage system, however, the benefit of an energy storage investor cannot be guaranteed due to the imperfect market mechanism and the high price of energy storage, and the further popularization of energy storage is hindered; the direct and indirect benefits of the auxiliary frequency modulation and peak regulation service of the energy storage system are scientifically calculated, the adjustment of future market mechanisms is facilitated, and the method has important significance for promoting the application of energy storage technology.
The method is influenced by the policies of rapid development of new energy and guaranteed consumption, the power generation space of the conventional thermal power generating unit is limited, the power generation function is gradually changed into the frequency modulation and peak shaving function, and the method becomes an important income mode for providing auxiliary service. At present, many achievements are obtained for the research of economic benefit evaluation of a Battery Energy Storage System (BESS) auxiliary frequency modulation and peak regulation auxiliary service on a power generation side, and most of research scenes are that energy storage is configured on a new energy power plant side or a thermal power plant side to realize combined regulation; the energy storage is configured in the new energy power plant, and the permeability of renewable energy can be effectively improved and the economic benefit of the new energy power plant can be improved by providing high-quality auxiliary services such as frequency modulation and peak shaving; the energy storage is configured in a thermal power plant and is mainly used for assisting thermal power depth peak regulation and Automatic Generation Control (AGC) frequency modulation, not only can the benefit be obtained by participating in the auxiliary service market, but also the effects of overhigh coal consumption, serious equipment abrasion, investment construction delay and the like of the unit power generation can be relieved, but due to the fact that the benefit indexes are difficult to calculate, the indirect benefit of the battery energy storage auxiliary service on the power generation side cannot be clearly quantized, the benefit distribution basis is insufficient, and the economic benefit of the BESS auxiliary frequency modulation peak regulation auxiliary service cannot be accurately evaluated.
Disclosure of Invention
Aiming at the problems, the method for optimizing the frequency modulation and peak regulation of the thermal power generating unit based on the BESS assistance solves the problems that the indirect benefit of the battery energy storage auxiliary service at the power generation side cannot be quantized, so that the income distribution basis is insufficient, and the economic benefit of the BESS auxiliary frequency modulation and peak regulation auxiliary service cannot be accurately evaluated.
The technical scheme adopted by the invention is as follows: a thermal power generating unit frequency modulation peak regulation optimization method based on BESS assistance comprises the following steps:
s1: establishing a cost model of BESS auxiliary frequency modulation peak regulation based on a full life cycle theory;
s2: establishing a yield model of BESS auxiliary frequency modulation peak shaving, including establishing a BESS frequency modulation yield model considering unit loss reduction, a BESS peak shaving yield model considering investment delay and a BESS recovery yield model;
s3: constructing a dynamic investment recovery period, investment profitability and net present value evaluation index calculation model based on the cost model and the profit model and solving;
s4: and establishing a frequency modulation peak regulation optimal scheme of the thermal power generating unit based on the solving result.
Preferably, the step S1 of establishing the cost model of the BESS-assisted frequency modulation peak shaving specifically includes establishing an investment cost model, an operation and maintenance cost model, a fault loss cost model, and a decommissioning disposal cost model.
Preferably, the total yield of the BESS-assisted frequency modulation peak shaving in the step S2 is obtained by the following formula:
R＝Rf+Rp+Rrecyde(6)
in the formula, R is the total income of the BESS configured in the thermal power plant; rfProviding a frequency modulation auxiliary service total income for a BESS auxiliary thermal power generating unit; rpProviding peak shaving assistance service gross revenue for the BESS; rrecyleRevenue was recovered for the BESS.
Preferably, the establishing of the BESS frequency modulation revenue model considering the unit loss reduction specifically includes:
Rf＝Rf1+Rf2+Rf3+Rf4(7)
in the formula, RfProviding a frequency modulation auxiliary service total income for a BESS auxiliary thermal power generating unit; rf1Compensating for direct profit for the frequency-modulated mileage; rf2Indirect gains for equivalently reducing unit loss cost; rf3Indirect gains for equivalently reducing the cost of fuel for system power generation; rf4Indirect benefit for equivalently reducing the power generation and pollution discharge cost of the system;
1) the direct gain of frequency modulation mileage compensation is obtained by the following formula:
wherein R isf1Compensating for direct profit for the frequency-modulated mileage; dtThe actual adjustment depth of the execution day of the frequency modulation unit is the frequency modulation mileage; kApThe specific calculation method of the comprehensive frequency modulation performance index of the frequency modulation unit on the execution day still uses the regulation of two detailed rules, which is equal to the product of three subentries of the regulation rate, the regulation precision and the response time; n is a radical offThe number of days of energy storage and frequency modulation operation in one year; lambda [ alpha ]1The price is settled for the mileage; t is the configured energy storage period of the thermal power plant;
2) the indirect benefit of equivalently reducing the unit loss cost is obtained by the following formula:
wherein R isf2Indirect gains for equivalently reducing unit loss cost; rthermalThe annual average running income of the thermal power generating unit is obtained; delta A is the prolonged operation life of the configured energy storage unit; r is the discount rate; m is the service life of the thermal power generating unit;
3) the indirect benefit of equivalently reducing the cost of fuel for power generation of the system is given by the following equation:
wherein R isf3Indirect gains for equivalently reducing the cost of fuel for system power generation; n is a radical offThe number of days of energy storage and frequency modulation operation in one year; etDischarging the electric quantity for the frequency modulation stored in the t day; wfuelThe fuel quantity required by unit generating capacity; cfuelIs the unit price of the fuel;
4) the indirect benefit for equivalently reducing the power generation and pollution discharge cost of the system is obtained by the following formula:
wherein R isf4Indirect benefit for equivalently reducing the power generation and pollution discharge cost of the system; n is a radical offThe number of days of energy storage and frequency modulation operation in one year; cNOx，CSO2，CCO2The pollution discharge cost of nitrogen oxide, sulfur dioxide and carbon dioxide required by each unit of generated energy is respectively; etAnd discharging the electricity quantity for the frequency modulation stored in the t day.
Preferably, the establishing of the BESS peak shaving income model considering investment delay is specifically:
Rp＝Rp1+Rp2+Rp3+Rp4+Rp5(15)
in the formula, RpProviding peak shaving assistance service gross revenue for the BESS; rp1Compensating for the annual BESS peak shaving price for direct revenue; rp2The indirect benefit of the cost of the thermal power installation is equivalently delayed; rp3The maintenance cost indirect income is equivalent to that of the thermal power generating unit; rp4Indirect gains for equivalently reducing the cost of fuel for system power generation; rp5Indirect benefit for equivalently reducing the power generation and pollution discharge cost of the system;
1) the BESS peak shaver price compensation direct gain is obtained by the following formula:
wherein R isp1Compensating for the annual BESS peak shaving price for direct revenue; eiPeak-shaving discharge electric quantity for energy storage in the ith day; e is the contract price of electricity of the power plant; n is a radical ofpThe number of days of energy storage and peak regulation operation in one year;
2) the equivalent delay thermal power installation cost indirect benefit is obtained through the following formula:
wherein R isp2The indirect benefit of the cost of the thermal power installation is equivalently delayed; t is thermal power annual running time; pthermalInstallation cost per unit volume; q is the ratio of the basic peak regulation capacity of the thermal power to the maximum output; n is a radical ofpThe number of days of energy storage and peak regulation operation in one year; eiPeak-shaving discharge electric quantity for energy storage in the ith day; r is the discount rate; m is the service life of the thermal power generating unit;
3) the maintenance cost indirect benefit of the equivalent thermal power generating unit is obtained by the following formula:
Rp3＝λ2Rp2(18)
wherein R isp3The maintenance cost indirect income is equivalent to that of the thermal power generating unit; lambda [ alpha ]2Is a coefficient; rp2The indirect benefit of the cost of the thermal power installation is equivalently delayed;
4) the indirect benefit of equivalently reducing the cost of fuel for power generation of the system is given by the following equation:
wherein R isp4Indirect gains for equivalently reducing the cost of fuel for system power generation; n is a radical ofpThe number of days of energy storage and peak regulation operation in one year; eiPeak-shaving discharge electric quantity for energy storage in the ith day; wfuelThe fuel quantity required by unit generating capacity; cfuelIs the unit price of the fuel;
5) the indirect benefit for equivalently reducing the power generation and pollution discharge cost of the system is obtained by the following formula:
wherein R isp5Indirect benefit for equivalently reducing the power generation and pollution discharge cost of the system; n is a radical ofpThe number of days of energy storage and peak regulation operation in one year; cNOx，CSO2，CCO2The pollution discharge cost of nitrogen oxide, sulfur dioxide and carbon dioxide required by each unit of generated energy is respectively; eiAnd discharging the electric quantity for peak shaving of the stored energy in the ith day.
Preferably, the establishing of the BESS revenue recovery model specifically includes:
in the formula, RrecyleRecovering revenue for the BESS; rmetaliFor the price of metal i, the element, the subscript represents the chemical symbol of the metal; rhometaliThe content of metal i in the energy storage battery per unit weight is percent; sratedCapacity of BESS, MW · h;energu_ienergy weight ratio of an energy storage system, kW.h/t; r is the discount rate; n is a radical ofyThe life cycle is full, year; n is the total number of permutations.
Preferably, the constructing of the dynamic investment recovery period index calculation model specifically includes:
in the formula, TPA dynamic investment recovery period; (C)I-CO)tNet cash flow for year t; r is a reference yield (co-current rate).
Preferably, the constructing of the investment profitability index calculation model specifically comprises:
in the formula, RinvThe return on investment is calculated; k is the total investment of the project, i.e. the life-cycle cost Clcc；NBThe average net annual benefit in the life cycle of the system, namely the average value of the total energy storage benefit in the whole life cycle.
Preferably, the average value of the total energy storage yield in the whole life cycle is obtained by the following formula:
in the formula, NBThe average value of the total energy storage income in the whole life cycle; n is a radical ofyThe life cycle is full, year; r (i) is the total yield of the i year of BESS assisted frequency modulation peak shaving.
Preferably, the constructing of the net present value evaluation index calculation model specifically includes:
wherein V is the net present value; n is a radical ofyThe life cycle is full, year; (C)I-CO)tNet cash flow for year t; r is a reference yield (co-current rate).
The beneficial effects of the technical scheme are as follows:
(1) the method solves the problems that indirect benefits of the battery energy storage auxiliary service at the power generation side cannot be quantized, so that the income distribution basis is insufficient, and the economic benefits of the BESS auxiliary frequency modulation and peak shaving auxiliary service cannot be accurately evaluated.
(2) The invention aims at the life cycle cost model of the BESS, adds a fault loss cost model and a retirement disposal cost model on the basis of an investment cost model and an operation cost model, and perfects the life cycle cost of the BESS.
(3) Aiming at the problems that the configured energy storage of a thermal power plant can play the roles of relieving overhigh coal consumption and serious equipment abrasion of the generating unit and delaying investment construction, but because the benefit indexes are difficult to calculate and can not be quantified definitely, the invention establishes an indirect profit model of BESS assisting the thermal power plant in frequency modulation to delay the service life of the generating unit and an energy storage peak shaving profit model considering investment delay.
(4) According to the invention, a BESS full-life cycle cost model and an energy storage profit model for calculating indirect profits such as reducing unit abrasion and delaying investment are adopted, so that profits are fully mined, the actual cost and the real value of energy storage auxiliary frequency modulation peak shaving are scientifically reflected, and a reference is provided for the operation strategy formulation of an auxiliary service market mechanism.
Drawings
FIG. 1 is a flow chart of a method for optimizing the frequency modulation and peak shaving of a thermal power generating unit based on BESS assistance according to the present invention;
FIG. 2 is an indirect profit R for equivalently reducing unit loss cost according to the present inventionf2The calculation idea diagram of (1);
FIG. 3 is a schematic diagram of a power plant side energy storage system access method in an exemplary analysis;
FIG. 4 is a graph of life cycle cost and revenue variation for scenario one and scenario two in an exemplary analysis;
FIG. 5 is a graph of the specific variation of the four types of costs in the BESS full life cycle cost in an exemplary analysis;
FIG. 6 is a diagram of the change of dynamic payback period indicators under scenario one and scenario two in an example analysis;
FIG. 7 is a graph of the change in profitability index for investment under scenario one and scenario two in an exemplary analysis;
FIG. 8 is a graph of the net present value indicator for scenario one and scenario two in an exemplary analysis.
Detailed Description
The embodiments of the present invention will be described in further detail with reference to the drawings and examples. The following detailed description of the embodiments and the accompanying drawings are provided to illustrate the principles of the invention and are not intended to limit the scope of the invention, which is defined by the claims, i.e., the invention is not limited to the preferred embodiments described.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways than those specifically described and will be readily apparent to those of ordinary skill in the art without departing from the spirit of the present invention, and therefore the present invention is not limited to the specific embodiments disclosed below.
Furthermore, reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one implementation of the invention. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.
Example 1
As shown in fig. 1, the invention provides a thermal power generating unit frequency modulation peak shaving optimization method based on BESS assistance, which includes the following steps:
s1: and establishing a cost model of BESS auxiliary frequency modulation peak regulation based on a full life cycle theory.
The full Life Cycle Cost (LCC) refers to all costs, direct, indirect, derived or non-derived, that occur or may occur throughout the life cycle of the system, as defined in the international electrotechnical commission IEC603003-3 standard; the BESS life cycle cost model comprises an investment cost model, an operation and maintenance cost model, a fault loss cost model and a retirement disposal cost model; BESS life cycle cost model ClccComprises the following steps:
Clcc＝Cinv+Com+CF+Cd(1)
in the formula, CinvThe investment cost; comFor operating maintenance costs; cFCost is lost for failure; cdFor retirement disposal costs.
(1) Investment cost model
The investment costs of the BESS typically include initial investment costs and replacement investment costs; the initial investment cost refers to fixed capital invested at one time in the initial stage of energy storage engineering construction; replacement investment cost refers to the capital expended to replace battery energy storage devices during energy storage operations; investment cost C of BESS in the whole life cycleinvObtained by the following formula:
in the formula, CinvThe investment cost; cpBESS unit power cost, ten thousand yuan/MW; pratedConfiguring power, MW, for BESS rating; csThe BESS unit capacity cost is ten thousand yuan/MW & h; sratedCapacity of BESS, MW · h; r is the discount rate; n is a radical ofyThe life cycle is full, year; k is the replacement frequency of the battery energy storage equipment; n is the total number of substitutions (N +1 times of total energy storage), N is Ny/NlifeIn which N islifeAnd obtaining the equivalent cycle life of the stored energy based on an equivalent conversion of a rain flow counting method.
(2) Operation maintenance cost model
The operation and maintenance cost refers to the fund dynamically invested for ensuring the normal operation of the stored energy within the service life, and generally comprises a fixed part determined by the energy storage converter PCS and a variable part determined by the charging and discharging electric quantity of the stored energy; the operational maintenance cost of the BESS over the life cycle is given by the following formula:
in the formula, ComFor operating maintenance costs; cpomThe unit power operation and maintenance cost is ten thousand yuan/MW; pratedConfiguring power, MW, for BESS rating; r is the discount rate; n is a radical ofyThe life cycle is full, year; t is the configured energy storage period of the thermal power plant; csomThe unit capacity operation and maintenance cost is ten thousand yuan/MW & h; w (t) is the annual charge-discharge capacity of energy storage, MW & h.
(3) Cost model for failure loss
The fault loss cost is the loss cost generated after the energy storage equipment fails, and comprises two parts, namely fault processing cost and power failure loss cost; wherein the failure processing cost is the cost spent by the owner department in rush repair according to the maintenance rules after the BESS fails to eliminate the failure, and the failure is processed intoThe average annual fault number is ×, the average fault processing cost is, the power failure loss cost is the power loss of BESS caused by the fault shutdown period, the power failure loss cost is BESS annual average charge and discharge power × annual average power failure duration × average auxiliary service market power price, the annual average power failure duration is × annual average fault number, the annual average fault number is N, the average fault processing cost is DFAnd the average repair time is 0.033, 600 yuan and 12h respectively; the failure loss cost is obtained by the following formula:
in the formula, CFCost is lost for failure; n is a radical ofyThe life cycle is full, year; n is the annual average failure frequency of the energy storage equipment; dFAverage failure handling cost; w (i) is the energy storage charge-discharge capacity in the ith year, MW & h; t isoffThe average annual power failure duration of the energy storage equipment is h; e (i) the auxiliary service market electricity price for the year of the ith year.
(4) Decommissioning disposal cost model
The decommissioning disposal cost is the cost generated by harmless treatment and recovery of the scrapped battery energy storage equipment in the whole life cycle; the lithium iron phosphate battery used in the invention does not contain heavy metal elements Pb, Cd, Hg and the like which cause high environmental pollution of the traditional battery, so the corresponding environment harmless treatment cost is slightly low, and the specific model is as follows:
in the formula, CdA cost for retirement disposition; cpdIs the retirement disposal cost per unit power, ten thousand yuan/MW; pratedConfiguring power, MW, for BESS rating; r is the discount rate; n is a radical ofyThe life cycle is full, year; n is the total replacement times (n +1 times of energy storage in total); j is the replacement frequency of the battery energy storage equipment; csdIs the retirement disposal cost per unit capacity, ten thousand yuan/MW & h; sratedCapacity of BESS, MW · h.
S2: and establishing a yield model of the BESS auxiliary frequency modulation peak shaving.
The yield model of the BESS auxiliary frequency modulation peak shaving comprises a BESS frequency modulation yield model considering unit loss reduction, a BESS peak shaving yield model considering investment delay and a BESS recovery yield model; the total gain of BESS-assisted frequency modulation peak shaving is obtained by the following formula:
R＝Rf+Rp+Rrecyde(6)
in the formula, R is the total yield of BESS auxiliary frequency modulation peak regulation; rfProviding a frequency modulation auxiliary service total income for a BESS auxiliary thermal power generating unit; rpProviding peak shaving assistance service gross revenue for the BESS; rrecyleRevenue was recovered for the BESS.
(1) BESS frequency modulation profit model considering unit loss reduction
The BESS auxiliary frequency modulation benefits comprise direct benefits and indirect benefits; the total yield of the BESS auxiliary thermal power generating unit for providing the frequency modulation auxiliary service is as follows:
Rf＝Rf1+Rf2+Rf3+Rf4(7)
in the formula, RfProviding a frequency modulation auxiliary service total income for a BESS auxiliary thermal power generating unit; rf1Compensating for direct profit for the frequency-modulated mileage; rf2Indirect gains for equivalently reducing unit loss cost; rf3Indirect gains for equivalently reducing the cost of fuel for system power generation; rf4The indirect benefit of reducing the cost of generating and discharging the sewage of the system is realized.
1) Direct gain of frequency modulated mileage compensation
The direct gain of frequency modulation market compensation is divided into frequency modulation mileage compensation gain and AGC capacity compensation gain, all power generation units providing qualified AGC service can obtain corresponding AGC capacity compensation cost, after BESS is increased, the influence on the AGC capacity compensation cost is small, the frequency modulation gain increment is mainly reflected on the frequency modulation mileage compensation cost, and the gain model analysis is carried out only by considering the frequency modulation mileage compensation cost.
The calculation method of 'two detailed rules' is still used, the frequency modulation mileage compensation is determined by the frequency modulation mileage, the frequency modulation performance index and the mileage settlement price, and the model specifically comprises the following steps:
in the formula, Rf1Compensating for direct profit for the frequency-modulated mileage; dtThe actual adjustment depth of the execution day of the frequency modulation unit is the frequency modulation mileage; kApThe specific calculation method of the comprehensive frequency modulation performance index of the frequency modulation unit on the execution day still uses the regulation of two detailed rules, which is equal to the product of three subentries of the regulation rate, the regulation precision and the response time; n is a radical offThe number of days of energy storage and frequency modulation operation in one year; lambda [ alpha ]1The price is settled for the mileage; and t is the configured energy storage period of the thermal power plant.
2) Indirect revenue equivalent to reducing unit loss cost
The energy storage is matched with the frequency modulation of the thermal power generating unit, so that the fatigue loss of core components such as a steam turbine rotor and the like caused by continuous variable load operation of the unit can be reduced, and the service life of the unit is prolonged; and taking the income of the unit in the delay period as the indirect income of BESS equivalent loss cost reduction of the unit.
The rotor life calculation of the steam turbine carries out low-cycle fatigue life loss calculation according to the delta-N low-cycle fatigue characteristic relation of a rotor material, and then the extended operation period of the unit configuration stored energy is obtained through the life loss, so that the income obtained by the power plant in the extended period is quantized, namely the indirect income of the unit loss cost is equivalently reduced, and the indirect income of the unit loss cost is equivalently reduced through the following formula:
in the formula, Rf2Indirect gains for equivalently reducing unit loss cost; rthermalThe annual average running income of the thermal power generating unit is obtained; delta A is the prolonged operation life of the configured energy storage unit; r is the discount rate; and M is the service life of the thermal power generating unit.
Indirect profit R for equivalently reducing unit loss costf2The computing concept of (2) is shown in fig. 2.
Delta A is the extended operation age of the configured energy storage unit, and is obtained by the difference value of the operation ages of the thermal power unit before and after the configuration of the energy storage unit, namely the difference value of the operation age of the configured energy storage unit and the operation age of the non-configured energy storage unit; the estimated operation age A of the unit is obtained through the following formula:
A＝(1-Df)·A1·Df -1(10)
in the formula, A is the estimated operation life of the unit; dfLow cycle fatigue loss; a. the1The year of operation;
the relation between the low cycle fatigue loss and the cycle number of the rotor cracking cycle is as follows:
Df＝1/(2Nt) (11)
in the formula, DfLow cycle fatigue loss; n is a radical oftCarrying out cracking cycle of the rotor;
the rotor cracking cycle frequency is determined through a Manson-coffee formula, the Manson-coffee formula describes the relation between the total strain amplitude and the rotor cracking cycle frequency, and the function relation is as follows:
wherein, the total strain amplitude is shown in the formula;fthe fatigue strength coefficient; b is fatigue strength index;fthe fatigue ductility coefficient; c is fatigue ductility index; e is the modulus of elasticity; n is a radical oftCarrying out cracking cycle of the rotor;
and (4) calculating the thermal stress and centrifugal tangential stress of the rotor when the corresponding unit outputs the force by adopting finite element calculation software ANSYS to obtain the total strain amplitude of the rotor.
3) Indirect revenue equivalent to reducing system power generation fuel costs
The method is characterized in that a BESS is configured in a thermal power plant to assist the thermal power unit in frequency modulation, the frequency modulation output of the thermal power unit can be reduced, and therefore the fuel cost required by corresponding generated energy is reduced, so that the method is equivalent to indirect benefit of reducing the fuel cost of system power generation, and the calculation formula is as follows:
in the formula, Rf3Indirect gains for equivalently reducing the cost of fuel for system power generation; n is a radical offThe number of days of energy storage and frequency modulation operation in one year; etDischarging the electric quantity for the frequency modulation stored in the t day; wfuelThe fuel quantity required by unit generating capacity; cfuelIs the unit price of the fuel.
4) Indirect benefit for equivalently reducing system power generation pollution discharge cost
The BESS is configured in the thermal power plant to assist the thermal power unit in frequency modulation and reduce the frequency modulation output of the thermal power unit, so that the greenhouse gas emission reduction benefit is realized, the greenhouse gas emission reduction benefit is equivalent to an indirect benefit of reducing the system power generation and pollution discharge cost, and the calculation formula is as follows:
in the formula, Rf4Indirect benefit for equivalently reducing the power generation and pollution discharge cost of the system; n is a radical offThe number of days of energy storage and frequency modulation operation in one year; cNOx，CSO2，CCO2The pollution discharge cost of nitrogen oxide, sulfur dioxide and carbon dioxide required by each unit of generated energy is respectively; etAnd discharging the electricity quantity for the frequency modulation stored in the t day.
(2) BESS peak-load gain model considering delayed investment
BESS assisted peak shaving benefits include direct benefits and indirect benefits; the total revenue of the BESS providing peak shaving assistance service is:
Rp＝Rp1+Rp2+Rp3+Rp4+Rp5(15)
in the formula, RpProviding peak shaving assistance service gross revenue for the BESS; rp1Compensating for the annual BESS peak shaving price for direct revenue; rp2The indirect benefit of the cost of the thermal power installation is equivalently delayed; rp3The maintenance cost indirect income is equivalent to that of the thermal power generating unit; rp4Indirect gains for equivalently reducing the cost of fuel for system power generation; rp5The indirect benefit of reducing the cost of generating and discharging the sewage of the system is realized.
1) BESS peak shaving price compensation direct gain
In the direct profit of BESS peak shaving price compensation, according to the stipulation of 'notice about promoting electric energy storage to participate in' three north 'area peak shaving auxiliary service work' issued by the State energy agency 2016: the energy storage facility is built at a power generation end, the energy storage and the unit jointly participate in peak shaving or participate in the market transaction of the peak shaving auxiliary service as an independent main body, the discharge electric quantity is settled according to the related contract electricity price of the power plant, and the compensation income is obtained through the following formula:
in the formula, Rp1Compensating for the annual BESS peak shaving price for direct revenue; eiPeak-shaving discharge electric quantity for energy storage in the ith day; e is the contract price of electricity of the power plant; n is a radical ofpThe number of days of energy storage and peak regulation operation in one year.
2) Equivalent delay of indirect profit of thermal power installation cost
The energy storage is matched with the peak regulation of the thermal power generating unit, so that the investment delay of equipment and facilities of the conventional unit can be realized; considering the capital time value, taking the capacity installation cost of the thermal power generating unit reduced by the peak shaving generating capacity of the energy storage substitution unit as the indirect benefit of equivalently delaying the thermal power installation cost, wherein the calculation formula is as follows:
in the formula, Rp2The indirect benefit of the cost of the thermal power installation is equivalently delayed; t is thermal power annual running time; pthermalInstallation cost per unit volume; q is the ratio of the basic peak regulation capacity of the thermal power to the maximum output; n is a radical ofpThe number of days of energy storage and peak regulation operation in one year; eiPeak-shaving discharge electric quantity for energy storage in the ith day; r is the discount rate; and M is the service life of the thermal power generating unit.
3) Indirect gain of maintenance cost of equivalent thermal power generating unit
The energy storage cooperation thermal power generating unit peak regulation except reducing the indirect income of thermal power generating unit capacity installation cost, has reduced the thermal power generating unit maintenance cost simultaneously to this cost, so with its equivalence for the indirect income of thermal power generating unit maintenance cost, its computational formula is:
Rp3＝λ2Rp2(18)
in the formula, Rp3The maintenance cost indirect income is equivalent to that of the thermal power generating unit; lambda [ alpha ]2Is a coefficient; rp2The indirect benefit of the cost of the thermal power installation is equivalently delayed.
4) Indirect revenue equivalent to reducing system power generation fuel costs
The thermal power plant is provided with the BESS to assist the thermal power unit in peak regulation, so that the frequency modulation output of the thermal power unit can be reduced, the fuel cost required by corresponding generated energy is reduced, the method is equivalent to indirect benefit of reducing the fuel cost of system power generation, and the calculation formula is as follows:
in the formula, Rp4Indirect gains for equivalently reducing the cost of fuel for system power generation; n is a radical ofpThe number of days of energy storage and peak regulation operation in one year; eiPeak-shaving discharge electric quantity for energy storage in the ith day; wfuelThe fuel quantity required by unit generating capacity; cfuelIs the unit price of the fuel.
5) Indirect benefit for equivalently reducing system power generation pollution discharge cost
The method is characterized in that the thermal power plant is provided with the BESS to assist the thermal power unit in peak regulation to reduce the frequency modulation output of the thermal power unit, so that the greenhouse gas emission reduction benefit is realized, the greenhouse gas emission reduction benefit is equivalent to an indirect benefit of reducing the system power generation and pollution discharge cost, and the calculation formula is as follows:
in the formula, Rp5Indirect benefit for equivalently reducing the power generation and pollution discharge cost of the system; n is a radical ofpThe number of days of energy storage and peak regulation operation in one year; cNOx，CSO2，CCO2The pollution discharge cost of nitrogen oxide, sulfur dioxide and carbon dioxide required by each unit of generated energy is respectively; eiFor storing energyPeak shaver charge on day i.
(3) BESS recovery yield
The recovery yield is the yield obtained after useful substances are separated from the waste and processed into reusable products; after the operation life of the energy stored in the lithium iron phosphate battery is finished, the lithium iron phosphate battery can obtain compounds of metals such as cobalt, lithium and the like from the waste lithium ion battery at a high recovery rate for recycling, so that a BESS recovery yield model is established as follows:
in the formula, RrecyleRecovering revenue for the BESS; rmetaliFor the price of metal i, the element, the subscript represents the chemical symbol of the metal; rhometaliThe content of metal i in the energy storage battery per unit weight is percent; sratedCapacity of BESS, MW · h;energu_ienergy weight ratio of an energy storage system, kW.h/t; r is the discount rate; n is a radical ofyThe life cycle is full, year; n is the total number of permutations.
S3: and constructing and solving a dynamic investment recovery period, investment profitability and net present value evaluation index model based on the cost model and the profit model.
And considering the capital time value, selecting economic evaluation indexes of the dynamic investment recovery period, the investment earning rate and the net present value, constructing an economic benefit evaluation index model of the BESS auxiliary frequency modulation peak shaving, and scientifically and effectively evaluating the economic benefit of the energy storage equipment configured in the thermal power plant.
(1) Dynamic recovery period of investment
The dynamic investment recovery period can be calculated by means of a project investment cash flow meter, the point of time when the accumulated net cash flow in the project investment cash flow meter is changed from a negative value to zero is the dynamic investment recovery period, and the dynamic investment recovery period is calculated by the following formula:
in the formula, TPFor dynamic investmentA recovery period; cIAllocating an energy storage annual income R for the cash inflow, namely the thermal power plant; cOCalculating the cash outflow, namely the sum of the equal-year-value investment cost, the annual operation and maintenance cost, the annual fault loss cost and the equal-year-value retirement disposal cost according to a formula (23); (C)I-CO)tNet cash flow for year t; r is a reference yield (co-current rate).
Wherein, COCash out amount; cinvThe investment cost; cpomThe unit power operation and maintenance cost is ten thousand yuan/MW; pratedConfiguring power, MW, for BESS rating; cdA cost for retirement disposition; r is the discount rate; n is a radical ofyThe life cycle is full, year; csomThe unit capacity operation and maintenance cost is ten thousand yuan/MW & h; w (t) is energy storage annual charge and discharge capacity, MW & h; n is the annual average failure frequency of the energy storage equipment; dFAverage failure handling cost; t isoffThe average annual power failure duration of the energy storage equipment is h; e (t) is the annual average auxiliary service market electricity price of the t year.
(2) Rate of return on investment
The investment profitability is also an important index for reflecting the profitability of the investment project, and the higher the investment profitability is, the better the profitability of the project is; the return on investment may be calculated as the ratio of the average net annual return over the entire life of the system to the total investment, the return on investment being calculated by the following equation:
in the formula, RinvThe return on investment is calculated; k is the total investment of the project, i.e. the life-cycle cost Clcc；NBThe average net annual gain in the life cycle of the system, namely the average value of the total energy storage gain in the whole life cycle, is obtained by the following formula:
wherein N isBThe average value of the total energy storage income in the whole life cycle; n is a radical ofyThe life cycle is full, year; r (i) is the total yield of the i year of BESS assisted frequency modulation peak shaving.
(3) Net present value
The net present value is the difference between the present value of the total income of the investment project and the present value of the total expenditure thereof, and reflects the profit condition of the project under the condition of considering the capital time value; the power plant calculates the net present value of BESS: if the net present value is larger than zero, an energy storage system can be built; if the net present value is less than zero, the project is generally considered not worth investment construction; if the net present value is zero, the actual condition needs to be specifically analyzed; when different equipment or project schemes to be selected are evaluated, the best one with the largest net present value is obtained, and the calculation formula is as follows:
wherein V is the net present value; n is a radical ofyThe life cycle is full, year; (C)I-CO)tNet cash flow for year t; r is a reference yield (co-current rate).
And solving the dynamic investment recovery period, the investment profitability and the net present value evaluation index calculation formula by adopting MATLAB software programming.
S4: and establishing a frequency modulation peak regulation optimal scheme of the thermal power generating unit based on the solving result.
Example 2
This example is an example analysis:
(1) basic parameters of arithmetic example
The invention takes a certain 300MW thermal power generating unit power plant combined 100MW/100MW & h battery energy storage system auxiliary frequency modulation and peak regulation service market as a test example, sets a capacity ratio and scheduling strategy of BESS auxiliary frequency modulation and peak regulation based on historical operation data of the power plant, and the access mode of a power plant side energy storage system is shown as a figure 3.
The full life cycle cost and income model constructed according to the method divides the calculation into two scenes, wherein the scene one does not take into account the indirect income of unit loss reduction and power plant investment delay; and scenario two accounts for the revenue. And selecting a lithium iron phosphate battery energy storage system as an example to analyze and calculate the economic benefit. The parameters of the battery energy storage system and the conventional generator set refer to the table 1.
TABLE 1 Battery energy storage System and conventional Generator set parameters
(2) Cost and profit calculation
Based on the information, the frequency modulation and peak regulation proportion of the BESS auxiliary thermal power generating unit is changed, the cost and the benefit of the scene one and the scene two are respectively calculated, and the life cycle cost and the benefit change of the scene one and the scene two are drawn according to the cost and the benefit change as shown in FIG. 4.
As can be seen from fig. 4, the BESS cost is the same in both scenarios, and as the duty ratio of the BESS fm capacity increases, the life cycle cost increases first, reaches a maximum of 4.9568 billion yuan at 80%, and then decreases. When the frequency modulation ratio is increased from 0 to 80%, the frequency modulation charging and discharging electric quantity provided by the energy storage is increased, the frequency modulation operation cost and the fault loss cost related to the energy storage charging and discharging electric quantity are increased, the increase amplitude of the frequency modulation operation cost and the fault loss cost is faster than the reduction speed of the corresponding peak regulation cost, and therefore the cost of the whole life cycle shows an increasing trend along with the increase of the frequency modulation ratio; when the frequency modulation percentage is increased to 80%, the cost reaches a maximum value of 4.9568 billion yuan; the output of the energy storage peak is reduced along with the increase of the duty ratio of the frequency modulation, the peak-shaving operation maintenance cost and the fault loss cost are reduced, and the total life cycle cost shows a descending trend; with various cost variations as shown in detail in figure 5.
As can be seen from fig. 4, the variation trend of the total revenue of the BESS under the two scenes is consistent, and the variation trend is gradually increased to reach the maximum value at 60% along with the increase of the duty ratio of the frequency modulation capacity of the BESS, wherein the first scene is 4.8331 hundred million yuan, the second scene is 6.1171 hundred million yuan, and then the maximum value is reachedUnder the condition that the frequency modulation peak regulation demand of the power plant is given, the frequency modulation demand is larger than the peak regulation demand, when the BESS frequency modulation ratio is controlled to be increased from 0 to 60 percent, the BESS assists the frequency modulation peak regulation together, and the average charge-discharge electricity quantity in the BESS year is increased from 7.82 × 10 which only assists the peak regulation at first along with the increase of the BESS frequency modulation ratio3MW · h increase to 1.39 × 10 for common auxiliary FM peak shaving4MW & h is about 1.78 times of the original MW & h, so that direct and indirect benefits of the frequency modulation auxiliary service determined by the electric quantity are remarkably improved, and the total benefit is remarkably increased; when the BESS frequency modulation proportion is increased from 60% to 100%, the output of the BESS auxiliary peak shaving assistance is gradually reduced to zero, the income is earned only through the auxiliary frequency modulation, the peak shaving income is limited, and the annual average charge and discharge electricity quantity is only 50.05% of the optimal value, so that the total income of frequency modulation peak shaving is rapidly reduced along with the reduction of the BESS output.
As a result, the cost is 4.9568 billion yuan at the maximum when the proportion is 80%; the gain is the greatest at a ratio of 60%, with scene one being 4.8331 billion dollars and scene two being 6.1171 billion dollars. In addition, the income of the second scenario is higher than the corresponding cost within the range of 50% -60%, and the profit advantage is achieved.
(3) Economic benefit evaluation and analysis
Calculating the dynamic investment recovery period evaluation index, the investment profitability evaluation index and the net present value evaluation index of the scene one and the scene two according to the obtained data of the total cost and the total income, wherein the obtained calculation results are shown in tables 2 and 3; the calculation results of the three types of evaluation indexes are plotted as fig. 6 to 8, and the variation trend thereof is analyzed.
Table 2 scenario-calculation results of each economic evaluation index
TABLE 3 calculation results of economic evaluation indexes of scene two
As can be seen from FIG. 6, the dynamic payback period TpRatio of frequency modulationThe change is shown by a decreasing and then increasing trend, T being 60% when the ratio ispThe minimum value is obtained, and the value of the scene two is smaller than that of the scene one, so that the economic benefit is better; when the BESS frequency modulation proportion is increased from 0 to 60 percent, the increment of the profit is obviously larger than the cost, the time for recovering the system investment of the thermal power plant is shortened, and TpReduction, indicating that the investment recovery capacity of the project is enhanced; conversely, if the ratio is greater than 60%, the cost increase is greater than the profit, TpThe increase of the investment recovery capability is weakened, and the T of the second scene income is higher than that of the first scene incomepThe index is close to the industry benchmark investment recovery period of 12 years when the BESS frequency modulation accounts for 50 percent and 60 percent, and the profit can be realized in the energy storage life cycle.
As can be seen from FIG. 7, the return on investment RinvThe change of the frequency modulation ratio shows the trend of increasing firstly and then decreasing, and when the ratio is 60 percent, RinvThe maximum value is obtained, and the value of the scene two is greater than that of the scene one, so that the economic benefit is better; when the proportion is increased from 0 to 60 percent, the increment of the profit is obviously larger than the increment of the cost, RinvThe profitability of the project is improved; conversely, if the ratio is greater than 60%, the cost increase is greater than the yield, RinvReduced, profitability of the project diminished, and its R since scene two revenue was higher than scene oneinvThe index is better than scene one.
As can be seen from fig. 8, the net present value V shows a trend of increasing and then decreasing with the change of the modulation frequency ratio, and when the ratio is 60%, the maximum value is obtained, and compared with the first scene, the value of the second scene is larger, and when the ratio tends to 50% -60%, V is larger than zero, which indicates that the modulation frequency ratio of the second scene BESS is 50% and 60% from the viewpoint of the V index, which has an investment value; when the BESS frequency modulation proportion is increased from 0 to 60 percent, the income is gradually increased, the increase amplitude of the income is superior to the cost, so the value of V is increased, but the income in the first scene is lower than the cost, so the V is a negative value, the proportion of the second scene is 50 percent, the income is higher than the cost in the 60 percent, and the V is positive, which indicates that the project has the profitability; on the contrary, when the proportion is more than 60%, the cost is increased more than the profit, V is reduced, and the profitability of the project is reduced.
In summary, when the frequency modulation ratio of the BESS is 60%, the three types of indexes are optimal, and compared with the industry benchmark profit indexes, the profit capacities of most of the investment energy storage projects are mostly insufficient, but if the operation strategy is optimized according to the market mechanism, the profit can be improved, and the profit capacity is basically close to the benchmark. And with the progress of energy storage technology, project profit space is gradually increased.
According to the invention, a BESS full-life cycle cost model and an energy storage profit model which takes account of indirect profits such as reducing unit abrasion and delaying investment are adopted, so that profits are fully mined, the actual cost and the real value of energy storage auxiliary frequency modulation peak shaving are scientifically reflected, and a reference is provided for the operation strategy formulation of an auxiliary service market mechanism; the problem of at present, indirect benefits of the battery energy storage auxiliary service on the power generation side cannot be quantized, so that the income distribution basis is insufficient, and the economic benefits of the BESS auxiliary frequency modulation and peak shaving auxiliary service cannot be accurately evaluated is solved.
Aiming at a life cycle cost model of the BESS, a fault loss cost model and a retirement disposal cost model are added on the basis of an investment cost model and an operation cost model, so that the life cycle cost of the BESS is improved; aiming at the problems that the configured energy storage of a thermal power plant can play the roles of relieving overhigh coal consumption and serious equipment abrasion of the generating unit and delaying investment construction, but because the benefit indexes are difficult to calculate and can not be quantified definitely, the invention establishes an indirect profit model of BESS assisting the thermal power plant in frequency modulation to delay the service life of the generating unit and an energy storage peak shaving profit model considering investment delay.
While the invention has been described with reference to a preferred embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In particular, the technical features mentioned in the embodiments can be combined in any way as long as there is no structural conflict. It is intended that the invention not be limited to the particular embodiments disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.
Claims (10)
1. A thermal power generating unit frequency modulation peak regulation optimization method based on BESS assistance is characterized by comprising the following steps:
s1: establishing a cost model of BESS auxiliary frequency modulation peak regulation based on a full life cycle theory;
s2: establishing a yield model of BESS auxiliary frequency modulation peak shaving, including establishing a BESS frequency modulation yield model considering unit loss reduction, a BESS peak shaving yield model considering investment delay and a BESS recovery yield model;
s3: constructing a dynamic investment recovery period, investment profitability and net present value evaluation index calculation model based on the cost model and the profit model and solving;
s4: and establishing a frequency modulation peak regulation optimal scheme of the thermal power generating unit based on the solving result.
2. The optimization method according to claim 1, wherein the cost model established in step S1 is specifically an investment cost model, an operation and maintenance cost model, a fault loss cost model and a retirement disposition cost model.
3. The optimization method according to claim 1, wherein the total yield of the BESS-assisted frequency modulation peak shaving in the step S2 is obtained by the following formula:
R＝Rf+Rp+Rrecyde(6)
in the formula, R is the total income of the BESS configured in the thermal power plant; rfProviding a frequency modulation auxiliary service total income for a BESS auxiliary thermal power generating unit; rpProviding peak shaving assistance service gross revenue for the BESS; rrecyleRevenue was recovered for the BESS.
4. The optimization method according to claim 1, wherein the establishing of the BESS frequency modulation revenue model considering the unit loss reduction specifically comprises:
Rf＝Rf1+Rf2+Rf3+Rf4(7)
in the formula, RfProviding a frequency modulation auxiliary service total income for a BESS auxiliary thermal power generating unit; rf1Compensating for direct profit for the frequency-modulated mileage; rf2Is equal toIndirect benefit of loss cost of the unit is effectively reduced; rf3Indirect gains for equivalently reducing the cost of fuel for system power generation; rf4Indirect benefit for equivalently reducing the power generation and pollution discharge cost of the system;
1) the direct gain of frequency modulation mileage compensation is obtained by the following formula:
wherein R isf1Compensating for direct profit for the frequency-modulated mileage; dtThe actual adjustment depth of the execution day of the frequency modulation unit is the frequency modulation mileage; kApThe specific calculation method of the comprehensive frequency modulation performance index of the frequency modulation unit on the execution day still uses the regulation of two detailed rules, which is equal to the product of three subentries of the regulation rate, the regulation precision and the response time; n is a radical offThe number of days of energy storage and frequency modulation operation in one year; lambda [ alpha ]1The price is settled for the mileage; t is the configured energy storage period of the thermal power plant;
2) the indirect benefit of equivalently reducing the unit loss cost is obtained by the following formula:
wherein R isf2Indirect gains for equivalently reducing unit loss cost; rthermalThe annual average running income of the thermal power generating unit is obtained; delta A is the prolonged operation life of the configured energy storage unit; r is the discount rate; m is the service life of the thermal power generating unit;
3) the indirect benefit of equivalently reducing the cost of fuel for power generation of the system is given by the following equation:
wherein R isf3Indirect gains for equivalently reducing the cost of fuel for system power generation; n is a radical offThe number of days of energy storage and frequency modulation operation in one year; etDischarging the electric quantity for the frequency modulation stored in the t day; wfuelThe fuel quantity required by unit generating capacity; cfuelIs the unit price of the fuel;
4) the indirect benefit for equivalently reducing the power generation and pollution discharge cost of the system is obtained by the following formula:
wherein R isf4Indirect benefit for equivalently reducing the power generation and pollution discharge cost of the system; n is a radical offThe number of days of energy storage and frequency modulation operation in one year; cNOx，CSO2，CCO2The pollution discharge cost of nitrogen oxide, sulfur dioxide and carbon dioxide required by each unit of generated energy is respectively; etAnd discharging the electricity quantity for the frequency modulation stored in the t day.
5. The optimization method according to claim 1, wherein the establishing of the BESS peak shaving income model taking into account the deferred investment is specifically:
Rp＝Rp1+Rp2+Rp3+Rp4+Rp5(15)
in the formula, RpProviding peak shaving assistance service gross revenue for the BESS; rp1Compensating for the annual BESS peak shaving price for direct revenue; rp2The indirect benefit of the cost of the thermal power installation is equivalently delayed; rp3The maintenance cost indirect income is equivalent to that of the thermal power generating unit; rp4Indirect gains for equivalently reducing the cost of fuel for system power generation; rp5Indirect benefit for equivalently reducing the power generation and pollution discharge cost of the system;
1) the BESS peak shaver price compensation direct gain is obtained by the following formula:
wherein R isp1Compensating for the annual BESS peak shaving price for direct revenue; eiPeak-shaving discharge electric quantity for energy storage in the ith day; e is the contract price of electricity of the power plant; n is a radical ofpThe number of days of energy storage and peak regulation operation in one year;
2) the equivalent delay thermal power installation cost indirect benefit is obtained through the following formula:
wherein R isp2The indirect benefit of the cost of the thermal power installation is equivalently delayed; t is thermal power annual running time; pthermalInstallation cost per unit volume; q is the ratio of the basic peak regulation capacity of the thermal power to the maximum output; n is a radical ofpThe number of days of energy storage and peak regulation operation in one year; eiPeak-shaving discharge electric quantity for energy storage in the ith day; r is the discount rate; m is the service life of the thermal power generating unit;
3) the maintenance cost indirect benefit of the equivalent thermal power generating unit is obtained by the following formula:
Rp3＝λ2Rp2(18)
wherein R isp3The maintenance cost indirect income is equivalent to that of the thermal power generating unit; lambda [ alpha ]2Is a coefficient; rp2The indirect benefit of the cost of the thermal power installation is equivalently delayed;
4) the indirect benefit of equivalently reducing the cost of fuel for power generation of the system is given by the following equation:
wherein R isp4Indirect gains for equivalently reducing the cost of fuel for system power generation; n is a radical ofpThe number of days of energy storage and peak regulation operation in one year; eiPeak-shaving discharge electric quantity for energy storage in the ith day; wfuelThe fuel quantity required by unit generating capacity; cfuelIs the unit price of the fuel;
5) the indirect benefit for equivalently reducing the power generation and pollution discharge cost of the system is obtained by the following formula:
wherein R isp5Indirect benefit for equivalently reducing the power generation and pollution discharge cost of the system;Npthe number of days of energy storage and peak regulation operation in one year; cNOx，CSO2，CCO2The pollution discharge cost of nitrogen oxide, sulfur dioxide and carbon dioxide required by each unit of generated energy is respectively; eiAnd discharging the electric quantity for peak shaving of the stored energy in the ith day.
6. The optimization method according to claim 1, wherein the establishing of the BESS recovery yield model specifically comprises:
in the formula, RrecyleRecovering revenue for the BESS; rmetaliFor the price of metal i, the element, the subscript represents the chemical symbol of the metal; rhometaliThe content of metal i in the energy storage battery per unit weight is percent; sratedCapacity of BESS, MW · h;energu_ienergy weight ratio of an energy storage system, kW.h/t; r is the discount rate; n is a radical ofyThe life cycle is full, year; n is the total number of permutations.
7. The optimization method according to claim 1, wherein the constructing of the dynamic investment recovery period index calculation model specifically comprises:
in the formula, TPA dynamic investment recovery period; (C)I-CO)tNet cash flow for year t; r is a reference yield (co-current rate).
8. The optimization method according to claim 1, wherein the constructing of the investment profitability index calculation model specifically comprises:
in the formula, RinvThe return on investment is calculated; k is the total investment of the project, i.e. the life-cycle cost Clcc；NBThe average net annual benefit in the life cycle of the system, namely the average value of the total energy storage benefit in the whole life cycle.
9. The optimization method according to claim 8, wherein the average value of the total energy storage yield in the whole life cycle is obtained by the following formula:
in the formula, NBThe average value of the total energy storage income in the whole life cycle; n is a radical ofyThe life cycle is full, year; r (i) is the total yield of the i year of BESS assisted frequency modulation peak shaving.
10. The optimization method according to claim 1, wherein the constructing of the net present value evaluation index calculation model specifically comprises:
wherein V is the net present value; n is a radical ofyThe life cycle is full, year; (C)I-CO)tNet cash flow for year t; r is a reference yield (co-current rate).
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| CN113780742A (en) * | 2021-08-13 | 2021-12-10 | 华电山东能源销售有限公司 | Computing method for flexibility improvement economy of power generation unit in auxiliary service market environment |
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