CN111598295A - Power system pumped storage power station installation optimization method for promoting wind power consumption - Google Patents
Power system pumped storage power station installation optimization method for promoting wind power consumption Download PDFInfo
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Abstract
The invention discloses a method for optimizing the installation of a pumped storage power station of a power system for promoting wind power consumption, which is characterized by comprising the following steps of: the method comprises the steps that a power system planning horizontal year load prediction parameter, a thermal power unit operation parameter which is clear and planned to be put into production, a hydropower station operation parameter which is clear in a planning horizontal year, wind power historical data, prediction data of a wind power 8760h output process in the planning horizontal year and various planned power supply economic indexes of the region are obtained; calculating thermal power installed capacity and wind power annual effective electric quantity corresponding to each pumped storage installed capacity scheme of the power system, system annual coal consumption total amount corresponding to the pumped storage installed capacity scheme and total cost current value of each pumped storage installed capacity scheme, and enabling the total cost current value of the system in the whole planning period to be the minimum scheme, and the method is a pumped storage power station installed capacity optimization scheme. The optimization method can be used for more reasonably optimizing the installed capacity of the pumped storage power station of the power system with large-scale wind power access.
Description
Technical Field
The invention relates to an optimization method for a pumped storage power station installation of a power system for promoting wind power consumption, and belongs to the technical field of pumped storage power station planning and designing.
Background
In order to solve the increasingly severe environmental problems in the world, safety, high efficiency, cleanness and low carbon become the direction of energy development in the world. The vigorous development of wind energy is a major measure for guaranteeing energy safety and improving energy structure in China. With the continuous development of an electric power system, the load characteristics are continuously changed, and the peak-to-valley difference of the load is continuously increased; the large-scale intermittent and random wind power consumption makes the peak regulation of the power grid more and more difficult. The pumped storage power station is flexible in operation and quick in response, is a special power supply with multiple functions of peak regulation, valley filling, frequency modulation, phase modulation, standby, black start and the like in a power system, and becomes a first choice for solving the peak regulation problem of the power system and promoting the consumption of new energy resources such as wind power and the like. In order to promote healthy and orderly construction of the pumped storage power station and promote efficient utilization of wind power, scientific demonstration of construction scale of the pumped storage power station is necessary.
In the planning and designing stage, the main technical basis for selecting the installed capacity of the pumped storage power station is the Water energy planning and designing Specification (NB/T35071-2015) of the pumped storage power station (hereinafter referred to as Specification). The regulations relating to wind power are mainly as follows:
specification article 6.0.5 specifies: the method is characterized in that wind power and other new energy sources are used for generating power, a relatively unfavorable typical operation mode is selected to participate in balance on the basis of analyzing the output power characteristics of the new energy sources, the wind power grid-surfing capacity in a low-ebb period is drawn up according to the regional wind energy resource conditions and peak-shaving power supply conditions, and the wind power grid-surfing capacity is determined through economic comparison if necessary.
Specification article 18.3.4 specifies: for power systems with higher specific gravity of water, electricity and new energy, the benefits of the water pumping and energy storage power station in the aspect of improving the utilization rate of renewable energy sources should be analyzed.
At present, when pumped storage power station planning and designing are carried out, for power and electric quantity balance of a power system with wind power, a relatively unfavorable typical operation mode is selected to participate in the power and electric quantity balance on the basis of analyzing the output characteristics of the power system. The typical operation mode is that the output of each month of the wind power is generally generalized to a typical 24-hour output process, and the accumulated annual electric quantity of the generalized output process is equal to the annual total electric quantity of the wind power planned by the power system in the horizontal year.
However, the wind power output has the characteristics of randomness and intermittence and is influenced by climate and landform, although the distribution range of each wind power plant in some areas is wider, the output simultaneity and complementarity of each wind power plant are higher, and the wind power output hardly contributes to the capacity of a power grid. If a generalized wind power typical operation mode is adopted to participate in power and electric quantity balance, the following problems exist:
a. and selecting an generalized typical operation mode to participate in power and electricity balance, considering the output in the general peak period according to 2-5% of the wind power installation, and calculating the result to show that the wind power has certain replacement capacity benefit. For a power system with poor wind power complementarity, the installed scale of system planning design is possibly small, and the situation of power shortage of the system is caused if wind power cannot output power during peak load.
b. A generalized typical operation mode is selected to participate in power and electric quantity balance, the output of the wind power during the low-ebb period is generally considered according to 60-70% of the wind power installation, the randomness of the output of the wind power is ignored, and the electric quantity provided by the wind power during the low-ebb period is exaggerated.
c. A generalized typical operation mode is selected to participate in electric power and electric quantity balance, the accumulated annual electric quantity in the generalized output process is equal to the annual total annual wind power electric quantity planned by the electric power system, and the benefit of the pumped storage power station on the aspect of improving the wind power utilization rate cannot be reflected.
Therefore, a generalized wind power typical operation mode is adopted to participate in power and electricity balance, the installed scale of system planning design is possibly small for a power system with large-scale wind power access and poor complementarity, the wind power can provide electricity during the valley period, and the benefit of the pumped storage power station in the aspect of improving the wind power utilization rate cannot be specifically analyzed.
The operation mode of the pumped storage power station mainly comprises valley filling, peak shaving and rotation for standby. Through retrieval, the invention patent "energy storage system capacity optimization configuration method for improving wind power acceptance capacity" patent application number: 201210046624.8. the principle is that an energy storage system is configured in a power grid, so that electric energy can be stored in the power grid under the condition of low-peak load, and can be released under the condition of high-peak load, so that the space-time stabilization of the load is realized, the load peak-valley difference is equivalently reduced, more downward regulation capacity is vacated by a generator set, and the wind power consumption is increased. The energy storage system operates according to a peak-load regulation mode, so that the peak-load difference of the system is reduced, the downward peak-load regulation capacity of the thermal power generating unit is improved, and the wind power consumption is increased. For the power system with large-scale wind power access, due to the randomness of wind power, in addition to windy weather, no surplus power is stably supplied for pumping storage in a valley period for pumping water in other periods, in order to ensure pumping storage peak power generation, the power generation amount in the valley period needs to be increased by the system, the conversion coefficient of the pumping power generation efficiency is calculated by 0.75, namely, 4-degree power in the valley is converted into 3-degree power in the peak, and if no sufficient peak-valley time-sharing power price policy exists, the financial survival of a pumping storage power station is difficult to maintain by the operation mode. If the system planning is performed by adopting a pumped storage peak-load regulation valley-filling mode, the thermal power installation scale of the system planning may be smaller.
Disclosure of Invention
The invention aims to provide a pumped storage power station installation optimization method for a power system, which is used for promoting wind power consumption. The invention utilizes the pumped storage unit to bear heat reserve so as to reduce the thermal power reserve capacity and increase the thermal power downward peak regulation capacity so as to increase the wind power consumption. And further, the wind power hourly output process of 8760h all the year around is adopted to accurately calculate the amount of absorbed wind power of the pumped storage unit in the valley period and correspondingly reduce the generated energy and coal consumption of the thermal power unit, and the scheme with the minimum national economic total expenditure of the system in the whole planning period is taken as the scheme for optimizing the configuration of the pumped storage unit, so that the influence of promoting wind power consumption on the capacity of the pumped storage unit configured by the system is reflected, and the installed capacity of the pumped storage power station of the power system is reasonably optimized.
The technical scheme of the invention is as follows: an optimization method of the installed machine of a pumped storage power station of a power system for promoting wind power consumption,
a. acquiring the forecast parameters of the horizontal annual load planned by the regional power system, wherein the forecast parameters comprise the highest power load, the power consumption, an annual load curve and a typical daily load curve;
b. acquiring operating parameters of a thermal power unit which is planned to be put into production and is specified in the horizontal year by the power system, wherein the operating parameters comprise single-machine capacity, technical minimum output and a fuel consumption characteristic curve of the thermal power unit to be put into production;
c. acquiring hydropower operation parameters which are clear in the planning horizontal year in the power system, wherein the parameters comprise the number of units, the capacity of a single machine, the average output and the expected output of each month in the horizontal year, the dry year and the dry year;
d. acquiring historical wind power data of a power system and planning horizontal year wind power 8760h output process prediction data;
e. obtaining various proposed power supply economic indexes including pumped storage power stations and thermal power unit kilowatt investment, operation rate, fixed asset residual value, standard coal price and current value coefficient;
f. calculating thermal power installed capacity and wind power annual effective electric quantity corresponding to each pumped storage installed capacity scheme of the power system;
g. calculating the total annual coal consumption of the system corresponding to each pumped storage installed capacity scheme of the power system;
h. and calculating the current value of the total cost of each pumped storage installed capacity scheme, so that the current value of the total cost of the system in the whole planning period is the minimum scheme, and the scheme is the installed capacity optimization scheme of the pumped storage power station.
In the aforementioned optimization method for the pumped storage power station installation of the power system for promoting wind power consumption, in step f, the wind power available electric quantity calculation process includes the following steps:
step f 1: calculating the downward peak regulation capacity of the coal-fired thermal power generating unit;
①, balancing the electricity quantity of the hydropower plants in the typical monthly day according to the hydropower operation parameters (average monthly output and expected monthly output in the open water year) in the step c, calculating the monthly thermal power starting capacity, and calculating the technical minimum output sum P of the monthly thermal power generating units according to the various thermal power single-machine capacities and the technical minimum output in the step bM,min；
PM.min＝PM.min1+PM.min2+PM.minN
In the formula: pM,min1、PM,min2、…PM,minNThe minimum output of a single thermal power generating unit technology is obtained;
②, carrying out monthly average load daily electric power and electric quantity balance, and calculating hourly output P of the coal-fired thermal power generating unitM,t0；
③ calculating the downward peak load regulation capacity N of coal-fired thermal power generating unitdown；
Ndown＝PM.t0-PM.min
Step f 2: acquiring wind power consumption electric quantity and wind abandon electric quantity according to the downward peak regulation capacity of thermal power:
calculating the wind power consumption electric quantity at the current moment:
obtaining forecast data of the wind power 8760h output process in the planned horizontal year according to the step d;
if the thermal power down-peak regulation capacity at the current moment is larger than the wind power output, the wind power consumption electric quantity is the wind power output at the current moment, and if the thermal power down-peak regulation capacity at the current moment is smaller than the wind power output, the wind power consumption electric quantity at the current moment is equal to the thermal power down-peak regulation capacity at the current moment;
in the formula: pwind.absFor the wind power consumption at the present moment, PwindWind power output at the current moment;
calculating the wind power abandon amount at the current moment:
Pwind.dis＝Pwind-Pwind,abs
in the formula: pwind.disAbandoning wind power for the current moment;
step f 3: the wind power is absorbed by the pumping capacity:
the principle is as follows: the system has surplus heat reserve capacity in the low ebb period, if the system has waste wind at the moment, the waste wind is absorbed by utilizing the pumping storage capacity, the thermal power generation amount is replaced in the load peak period, and the system coal consumption is saved; if the peak regulation electric quantity of the water-electricity abandoned water exists, the peak regulation electric quantity of the water-electricity abandoned water is absorbed preferentially;
the specific calculation formula and description are as follows:
when the pumping capacity is smaller than the output of the water and electricity abandoned water, the electricity quantity absorbed by the abandoned wind is 0; when the pumping capacity deducts the hydroelectric waste water output and is larger than the waste wind output, the waste wind absorbed electric quantity is equal to the current waste wind output; after the water and electricity abandoned water output is deducted from the pumping storage capacity, the water and electricity abandoned water output is less than the wind and electricity abandoned wind output, and the electricity quantity absorbed by the abandoned wind is equal to the difference between the current pumping storage capacity and the water and electricity abandoned water output:
in the formula: n is a radical ofpfTo draw storage capacity PHdRegulating the peak output of the water and electricity abandoned water at the current moment;
step f 4: calculating the annual effective electric quantity and annual abandoned wind electric quantity of the wind power;
the wind power annual effective electric quantity calculation formula:
in the formula: n is the number of time periods for absorbing the abandoned wind during the low-valley period of the suction storage; eta is the conversion coefficient of the pumping power generation efficiency, and the value is 0.75;
calculating the annual abandoned wind electric quantity of the wind power:
in the method for optimizing the installed capacity of the pumped storage power station of the power system for promoting wind power consumption, in step f, the calculation mode of the installed capacity of the thermal power plant corresponding to each pumped storage installed capacity scheme of the system is as follows:
and (4) according to the hydropower operation parameters (average monthly output and predicted output in dry water), carrying out monthly typical daily power and electricity balance to obtain the thermal power installed capacity corresponding to each pumped storage installed capacity scheme of the system.
In the aforementioned optimization method for the pumped storage power station installation of the power system for promoting wind power consumption, the power and electric quantity balance principle in step f includes the following contents:
1) the peak load of the daily load curve is borne by the hydropower with the adjusting performance, the forced output of the hydropower with the adjusting performance and the base load borne by the hydropower without the adjusting performance;
2) the thermal power bears the residual peak load, waist load and base load; the installed capacity is balanced, and the insufficient capacity is supplemented by thermal power;
3) the operation mode of the pumped storage unit is as follows: the method mainly bears heat reserve in the power system, when the load is in a low-ebb period, the system heat reserve has surplus, the storage capacity is used for absorbing the wind reserve capacity, the thermal power generating unit is replaced to generate power in a peak period, and the heat reserve borne by the thermal power generating unit is borne when the storage power generating unit is pumped;
4) the constraint:
power balance constraint: b, carrying out 24h power balance constraint on the system monthly typical day, wherein 24h power of the system monthly typical day is obtained according to the step a;
Dt＝NHt+NTt+NPt
in the formula: dtLoad of the power system at the time t; n is a radical ofHt、NTt、NPtRespectively the output of water, electricity, thermal power and pumped storage at the moment t, the wind power does not participate in the power balance, ② the system load and the accident reserve constraint
SH+ST+SP≥SD
SH≤SH.MAnd SP≤SP.M
In the formula SH、ST、SPSpare capacity for loads and accidents borne by hydroelectric, thermal and pumped storage, SDThe system needs load and spare capacity for accidents. SH.M、SP.MMaximum load and accident reserve capacity can be provided for water, electricity and pumped storage;
the electric quantity balance constraint is that the electric quantity needed by the electric power system month by month is equal to the sum of the generated energy of various power supplies; the monthly electricity demand of the system is obtained according to the step a in claim 1;
ED＝EH+ET+EW+EP
in the formula: eDThe amount of electricity needed by the power system month by month; eH、ET、EW、EPRespectively generating capacity of water, fire, wind and pumped storage power stations;
pumping and generating balance constraint of a pumped storage power station:
EGPi＝ηi·EPPi
in the formula: eGPi、EPPiη is the generated energy and pumped electricity quantity of the pumped storage power station wind abandoning days respectivelyiThe value is 0.75 for the conversion efficiency of pumping and generating electricity;
fourthly, various power station operation constraints: the thermal power technology minimum output constraint and the installed capacity constraint are constrained according to the thermal power operation parameter in the step b of claim 1; hydropower station installed capacity, expected output and forced output constraints are constrained according to hydropower operation parameter constraints in the step c of claim 1; the installed capacity of the pumped storage power station is restricted;
electric overhaul restraint: the maintenance time of the thermal power generating unit is 45 days, and the maintenance time is arranged in a water and electricity abundance period of 5-10 months;
sixthly, hydroelectric maintenance restriction: the maintenance time of the hydroelectric generating set is 30 days, and the hydroelectric generating set is arranged in a withering period of 11 months to 4 months in the next year, wherein the hydroelectric generating set has small electric output;
5) balancing electric power quantity by adopting a horizontal year and a dry year for month-by-month balancing, and calculating thermal power installed capacity corresponding to each pumped storage installed capacity scheme of the power system by adopting a designed dry year; wind power absorption electric quantity and system annual coal consumption total quantity corresponding to each pumped storage installed capacity scheme of the power system adopt design horizontal annual calculation results.
In the aforementioned optimization method for the installation of the pumped storage power station of the power system for promoting wind power consumption,
in the step g, the total annual coal consumption of the system corresponding to each pumped storage installed capacity scheme of the power system is calculated in the following mode: after the step f is finished, obtaining the thermal power output process after the system absorbs the wind power,
b, planning a fuel consumption characteristic curve of the thermal power generating units which are determined and planned to be put into production in the horizontal year, determining the type of the thermal power generating units with the capacity increased and decreased from small to large by slightly increasing the coal consumption, so as to obtain the hourly output of various units, calculating the coal combustion amount by the fuel consumption characteristic curve of various units, summarizing the coal combustion amount of various units to obtain the thermal power coal combustion amount at the moment, summarizing the coal consumption for 8760 hours, and obtaining the total coal combustion amount of the system in the whole year.
In the aforementioned optimization method for the installation of the pumped storage power station of the power system for promoting wind power consumption,
in the step h, the economic and reasonable scheme for optimally configuring the installed capacity of the pumped storage power station of the power system is a scheme for minimizing the current value of the total cost of the system in the whole planning period on the premise of meeting the system requirements and various constraint conditions; the function expression with the lowest total cost current value is as follows:
in the formula: minPC is the minimum cost of the system; n is the planning period, t is the number of years;
i is the investment of fixed assets of the power station, including the investment of pumped storage and thermal power fixed assets, and is obtained by multiplying the installed capacity of pumped storage and the installed capacity of thermal power by the investment of pumped storage and the kilowatt of thermal power units respectively; calculating the thermal power installed capacity corresponding to each pumped storage installed capacity scheme of the system according to the step f; e, acquiring pumped storage power stations and kilowatt investment of thermal power units;
the operation charge of the power station is Oc, comprises pumped storage and thermal power operation charge, and is obtained by multiplying the investment of pumped storage power station and thermal power fixed assets by corresponding operation charge rate; and e, obtaining the operation rates of the pumped storage power station and the thermal power plant according to the step e.
F is the system fuel cost, and is obtained by multiplying the total coal consumption of the system calculated in the step g by the price of the standard coal; and e, obtaining the price of the marked coal according to the step e.
Sv is a fixed asset residual value recovered at the end of the calculation period; obtaining according to the step e;
The effect analysis of the invention: compared with the existing balance participation by adopting a typical operation mode with wind power being unfavorable, the optimization method can accurately calculate the thermal power installed capacity reduced by the pumped storage power station due to the adoption of system hot standby, the increased wind power effective electric quantity and the thermal power generated quantity and coal consumption reduced correspondingly due to the increase of wind power consumption aiming at the characteristic of wind power output randomness, can reflect the influence of the pumped storage power station on the increase of the wind power effective electric quantity, the reduction of the thermal power installed capacity and the reduction of the thermal power coal consumption on the installed capacity of the pumped storage power station configured in the system, can specifically analyze the benefit of the pumped storage power station on the promotion of the efficient utilization of the wind power, and can reasonably optimize the installed capacity of the pumped storage power station of the power system with large-scale wind power access.
The operation mode of peak load shifting and valley filling is adopted, for a power system with strong wind power randomness, except in windy weather, extra power is not stably supplied for a long time to pump the storage valley, the system is required to increase the valley generating capacity for ensuring the generation of the peak load of the storage, and if the operation mode does not have a sufficient peak-valley time-sharing power price policy, the financial survival of the storage power station is difficult to maintain.
The standby operation of heat pumping and storage can maintain financial survival by establishing an electric power system auxiliary service market, and is practical and feasible. Compared with the two operation modes, the peak-load-adjusting operation mode has large pumping and storage scale, which causes waste, and the thermal power installation scale of the corresponding system planning is small, which brings hidden troubles to the safe and stable operation of the system. Therefore, for a large-scale wind power accessed power system, the optimal configuration scheme of the heat pumping and storage standby operation mode is more reasonable.
Detailed Description
The present invention is further illustrated by the following examples, which are not to be construed as limiting the invention.
The technical scheme of the embodiment of the invention is as follows: an optimization method of the installed machine of a pumped storage power station of a power system for promoting wind power consumption,
a. acquiring the forecast parameters of the horizontal annual load planned by the regional power system, wherein the forecast parameters comprise the highest power load, the power consumption, an annual load curve and a typical daily load curve;
b. acquiring operating parameters of a thermal power unit which is planned to be put into production and is specified in the horizontal year by the power system, wherein the operating parameters comprise single-machine capacity, technical minimum output and a fuel consumption characteristic curve of the thermal power unit to be put into production;
c. acquiring hydropower operation parameters which are clear in the planning horizontal year in the power system, wherein the parameters comprise the number of units, the capacity of a single machine, the average output and the expected output of each month in the horizontal year, the dry year and the dry year;
d. acquiring historical wind power data of a power system and planning horizontal year wind power 8760h output process prediction data;
e. obtaining various proposed power supply economic indexes including pumped storage power stations and thermal power unit kilowatt investment, operation rate, fixed asset residual value, standard coal price and current value coefficient;
f. calculating thermal power installed capacity and wind power annual effective electric quantity corresponding to each pumped storage installed capacity scheme of the power system;
g. calculating the total annual coal consumption of the system corresponding to each pumped storage installed capacity scheme of the power system;
h. and calculating the current value of the total cost of each pumped storage installed capacity scheme, so that the current value of the total cost of the system in the whole planning period is the minimum scheme, and the scheme is the installed capacity optimization scheme of the pumped storage power station.
In the aforementioned optimization method for the pumped storage power station installation of the power system for promoting wind power consumption, in step f, the wind power available electric quantity calculation process includes the following steps:
step f 1: calculating the downward peak regulation capacity of the coal-fired thermal power generating unit;
①, balancing the electricity quantity of the hydropower plants in the typical monthly day according to the hydropower operation parameters (average monthly output and expected monthly output in the open water year) in the step c, calculating the monthly thermal power starting capacity, and calculating the technical minimum output sum P of the monthly thermal power generating units according to the various thermal power single-machine capacities and the technical minimum output in the step bM,min；
PM.min＝PM.min1+PM.min2+PM.minN
In the formula: pM,min1、PM,min2、…PM,minNThe minimum output of a single thermal power generating unit technology is obtained;
②, carrying out monthly average load daily electric power and electric quantity balance, and calculating hourly output P of the coal-fired thermal power generating unitM,t0；
③ calculating the downward peak load regulation capacity N of coal-fired thermal power generating unitdown；
Ndown＝PM.t0-PM.min
Step f 2: acquiring wind power consumption electric quantity and wind abandon electric quantity according to the downward peak regulation capacity of thermal power:
calculating the wind power consumption electric quantity at the current moment:
obtaining forecast data of the wind power 8760h output process in the planned horizontal year according to the step d;
if the thermal power down-peak regulation capacity at the current moment is larger than the wind power output, the wind power consumption electric quantity is the wind power output at the current moment, and if the thermal power down-peak regulation capacity at the current moment is smaller than the wind power output, the wind power consumption electric quantity at the current moment is equal to the thermal power down-peak regulation capacity at the current moment;
in the formula: pwind.absFor the wind power consumption at the present moment, PwindWind power output at the current moment;
calculating the wind power abandon amount at the current moment:
Pwind.dis＝Pwind-Pwind,abs
in the formula: pwind.disIs at presentAbandoning wind power at any moment;
step f 3: the wind power is absorbed by the pumping capacity:
the principle is as follows: the system has surplus heat reserve capacity in the low ebb period, if the system has waste wind at the moment, the waste wind is absorbed by utilizing the pumping storage capacity, the thermal power generation amount is replaced in the load peak period, and the system coal consumption is saved; if the peak regulation electric quantity of the water-electricity abandoned water exists, the peak regulation electric quantity of the water-electricity abandoned water is absorbed preferentially;
the specific calculation formula and description are as follows:
when the pumping capacity is smaller than the output of the water and electricity abandoned water, the electricity quantity absorbed by the abandoned wind is 0; when the pumping capacity deducts the hydroelectric waste water output and is larger than the waste wind output, the waste wind absorbed electric quantity is equal to the current waste wind output; after the water and electricity abandoned water output is deducted from the pumping storage capacity, the water and electricity abandoned water output is less than the wind and electricity abandoned wind output, and the electricity quantity absorbed by the abandoned wind is equal to the difference between the current pumping storage capacity and the water and electricity abandoned water output:
in the formula: n is a radical ofpfTo draw storage capacity PHdRegulating the peak output of the water and electricity abandoned water at the current moment;
step f 4: calculating the annual effective electric quantity and annual abandoned wind electric quantity of the wind power;
the wind power annual effective electric quantity calculation formula:
in the formula: n is the number of time periods for absorbing the abandoned wind during the low-valley period of the suction storage; eta is the conversion coefficient of the pumping power generation efficiency, and the value is 0.75;
calculating the annual abandoned wind electric quantity of the wind power:
in the method for optimizing the installed capacity of the pumped storage power station of the power system for promoting wind power consumption, in step f, the calculation mode of the installed capacity of the thermal power plant corresponding to each pumped storage installed capacity scheme of the system is as follows:
and (4) according to the hydropower operation parameters (average monthly output and predicted output in dry water), carrying out monthly typical daily power and electricity balance to obtain the thermal power installed capacity corresponding to each pumped storage installed capacity scheme of the system.
In the aforementioned optimization method for the pumped storage power station installation of the power system for promoting wind power consumption, the power and electric quantity balance principle in step f includes the following contents:
1) the peak load of the daily load curve is borne by the hydropower with the adjusting performance, the forced output of the hydropower with the adjusting performance and the base load borne by the hydropower without the adjusting performance;
2) the thermal power bears the residual peak load, waist load and base load; the installed capacity is balanced, and the insufficient capacity is supplemented by thermal power;
3) the operation mode of the pumped storage unit is as follows: the method mainly bears heat reserve in the power system, when the load is in a low-ebb period, the system heat reserve has surplus, the storage capacity is used for absorbing the wind reserve capacity, the thermal power generating unit is replaced to generate power in a peak period, and the heat reserve borne by the thermal power generating unit is borne when the storage power generating unit is pumped;
4) the constraint:
power balance constraint: b, carrying out 24h power balance constraint on the system monthly typical day, wherein 24h power of the system monthly typical day is obtained according to the step a;
Dt＝NHt+NTt+NPt
in the formula: dtLoad of the power system at the time t; n is a radical ofHt、NTt、NPtRespectively the output of water, electricity, thermal power and pumped storage at the moment t, the wind power does not participate in the power balance, ② the system load and the accident reserve constraint
SH+ST+SP≥SD
SH≤SH.MAnd SP≤SP.M
In the formula SH、ST、SPSpare capacity for loads and accidents borne by hydroelectric, thermal and pumped storage, SDThe system needs load and spare capacity for accidents.SH.M、SP.MMaximum load and accident reserve capacity can be provided for water, electricity and pumped storage;
the electric quantity balance constraint is that the electric quantity needed by the electric power system month by month is equal to the sum of the generated energy of various power supplies; the monthly electricity demand of the system is obtained according to the step a in claim 1;
ED＝EH+ET+EW+EP
in the formula: eDThe amount of electricity needed by the power system month by month; eH、ET、EW、EPRespectively generating capacity of water, fire, wind and pumped storage power stations;
pumping and generating balance constraint of a pumped storage power station:
EGPi＝ηi·EPPi
in the formula: eGPi、EPPiη is the generated energy and pumped electricity quantity of the pumped storage power station wind abandoning days respectivelyiThe value is 0.75 for the conversion efficiency of pumping and generating electricity;
fourthly, various power station operation constraints: the thermal power technology minimum output constraint and the installed capacity constraint are constrained according to the thermal power operation parameter in the step b of claim 1; hydropower station installed capacity, expected output and forced output constraints are constrained according to hydropower operation parameter constraints in the step c of claim 1; the installed capacity of the pumped storage power station is restricted;
electric overhaul restraint: the maintenance time of the thermal power generating unit is 45 days, and the maintenance time is arranged in a water and electricity abundance period of 5-10 months;
sixthly, hydroelectric maintenance restriction: the maintenance time of the hydroelectric generating set is 30 days, and the hydroelectric generating set is arranged in a withering period of 11 months to 4 months in the next year, wherein the hydroelectric generating set has small electric output;
5) balancing electric power quantity by adopting a horizontal year and a dry year for month-by-month balancing, and calculating thermal power installed capacity corresponding to each pumped storage installed capacity scheme of the power system by adopting a designed dry year; wind power absorption electric quantity and system annual coal consumption total quantity corresponding to each pumped storage installed capacity scheme of the power system adopt design horizontal annual calculation results.
In the aforementioned optimization method for the installation of the pumped storage power station of the power system for promoting wind power consumption,
in the step g, the total annual coal consumption of the system corresponding to each pumped storage installed capacity scheme of the power system is calculated in the following mode: after the step f is finished, obtaining the thermal power output process after the system absorbs the wind power,
b, planning a fuel consumption characteristic curve of the thermal power generating units which are determined and planned to be put into production in the horizontal year, determining the type of the thermal power generating units with the capacity increased and decreased from small to large by slightly increasing the coal consumption, so as to obtain the hourly output of various units, calculating the coal combustion amount by the fuel consumption characteristic curve of various units, summarizing the coal combustion amount of various units to obtain the thermal power coal combustion amount at the moment, summarizing the coal consumption for 8760 hours, and obtaining the total coal combustion amount of the system in the whole year.
In the aforementioned optimization method for the installation of the pumped storage power station of the power system for promoting wind power consumption,
in the step h, the economic and reasonable scheme for optimally configuring the installed capacity of the pumped storage power station of the power system is a scheme for minimizing the current value of the total cost of the system in the whole planning period on the premise of meeting the system requirements and various constraint conditions; the function expression with the lowest total cost current value is as follows:
in the formula: minPC is the minimum cost of the system; n is the planning period, t is the number of years;
i is the investment of fixed assets of the power station, including the investment of pumped storage and thermal power fixed assets, and is obtained by multiplying the installed capacity of pumped storage and the installed capacity of thermal power by the investment of pumped storage and the kilowatt of thermal power units respectively; calculating the thermal power installed capacity corresponding to each pumped storage installed capacity scheme of the system according to the step f; e, acquiring pumped storage power stations and kilowatt investment of thermal power units;
the operation charge of the power station is Oc, comprises pumped storage and thermal power operation charge, and is obtained by multiplying the investment of pumped storage power station and thermal power fixed assets by corresponding operation charge rate; and e, obtaining the operation rates of the pumped storage power station and the thermal power plant according to the step e.
F is the system fuel cost, and is obtained by multiplying the total coal consumption of the system calculated in the step g by the price of the standard coal; and e, obtaining the price of the marked coal according to the step e.
Sv is a fixed asset residual value recovered at the end of the calculation period; obtaining according to the step e;
The technical scheme of the invention is completely and clearly described by a calculation example of the optimal configuration analysis of the pumped storage power station in 2030 years of a certain power system planning level.
In order to solve the technical problem, the method comprises the following steps:
acquiring the forecast data of the planned horizontal annual load of the power system, wherein the forecast data comprises the highest power load, the annual power consumption, an annual load curve and a typical daily load curve.
TABLE 1 prediction data of the provincial load of a certain power system
TABLE 2 outgoing load prediction data
TABLE 3 prediction result table of power demand of certain power system
TABLE 4 year load curve prediction data (per unit value)
TABLE 5 Long-term typical daily load curve prediction data (2030) (per unit value)
Acquiring operation parameters of thermal power and thermal power unit to be put into production, including single-machine capacity, technical minimum output and fuel consumption characteristic curve of the thermal power unit to be put into production, which are already defined in the planning level of the power system;
TABLE 6 Fuel consumption characteristic curve chart of various thermal power generating units
Table 7 constructed peak load regulation rate table for coal-fired thermal power generating unit
The capacity of the newly-increased thermal power generating units is 660MW units, and the minimum technical output rate is 50%. Acquiring the clear hydropower operation parameters in the planning horizontal year of the power system, wherein the clear hydropower operation parameters comprise the number of units, the single-machine capacity, the average output of the power system in the horizontal year, the average output of the power system in the dry year and the predicted output of the power system in the dry year.
TABLE 6 plan horizontal year set power supply installation
Acquiring wind power historical data in the power system and planning horizontal year wind power 8760h predicted output data. The installed scale of the horizontal annual wind power is planned to be 10000MW, and the annual total electric quantity is 178.42 hundred million kWh. And simulating the optimized operation of the power system according to the obtained number and the operation parameters of the thermal power units, the number and the operation parameters of the hydroelectric power units, the number and the operation parameters of the pumped storage units and the load data of the power system.
The principle of electric power and electric quantity balance is as follows:
1) the peak load of the daily load curve is borne by the hydropower with the adjusting performance, the forced output of the hydropower with the adjusting performance and the base load borne by the hydropower without the adjusting performance;
2) the thermal power bears the residual peak load, waist load and base load; the installed capacity is balanced, and the insufficient capacity is supplemented by thermal power.
3) The operation mode of the pumped storage unit is as follows: hot standby is mainly assumed in the power system. When the load is provided with the abandoned wind in the low-ebb period, the heat reserve of the system is surplus, the abandoned wind capacity is absorbed by utilizing the pumping capacity, the thermal power generating unit is replaced to generate power in the peak period, and the heat reserve born by the pumping capacity during power generation is born by the thermal power generating unit.
4) The constraint:
power balance constraint: system monthly typical day 24h power balance constraint
Dt＝NHt+NTt+NPt
In the formula: dtLoad of the power system at the time t; n is a radical ofHt、NTt、NPtRespectively representing the output of water, electricity, thermal power and pumped storage at the moment t; wind power does not participate in power balance.
Spare restraint of system load and accident
SH+ST+SP≥SD
SH≤SH.MAnd SP≤SP.M
In the formula SH、ST、SPSpare capacity for loads and accidents borne by hydroelectric, thermal and pumped storage, SDThe system needs load and spare capacity for accidents. SH.M、SP.MThe maximum load and the emergency reserve capacity can be provided for water, electricity and pumped storage.
The system load spare rate is 3 percent, the accident spare rate is 10 percent (half of the system load spare rate is rotary spare rate), and the spare power is not considered by the outgoing power.
And thirdly, electric quantity balance constraint, namely the electric quantity needed by the electric power system month by month is equal to the sum of the generated energy of various power supplies.
ED＝EH+ET+EW+EP
In the formula: eDThe amount of electricity needed by the power system month by month; eH、ET、EW、EPRespectively generating capacity of water, fire, wind and pumped storage power stations;
daily pumped-water power generation balance constraint of a pumped-water energy storage power station:
EGPi＝ηi·EPPi
in the formula: eGPi、EPPiη is the generated energy and pumped electricity quantity of the pumped storage power station in day i respectivelyiThe value is 0.75 for the conversion efficiency of pumping and generating electricity;
fourthly, various power station operation constraints: the thermal power technology minimum output constraint and the installed capacity constraint; the installed capacity, the expected output and the forced output of the hydropower station are constrained; the installed capacity of the pumped storage power station is restricted, and the pumped storage is restricted by taking the unit as a unit;
electric overhaul restraint: the maintenance time of the thermal power generating unit is 45 days, and the maintenance time is arranged in a water and electricity abundance period of 5-10 months;
sixthly, hydroelectric maintenance restriction: the maintenance time of the hydroelectric generating set is 30 days, and the hydroelectric generating set is arranged in a withering period of 11 months to 4 months in the next year, wherein the hydroelectric generating set has small electric output.
5) Balancing the electric quantity of the electric power by adopting the balance of the electric power in open water and in dry water month by month; the thermal power installed capacity corresponding to each pumped storage installed capacity scheme of the power system adopts a design dry year calculation result; wind power absorption electric quantity and system annual coal consumption total quantity corresponding to each pumped storage installed capacity scheme of the power system adopt design horizontal annual calculation results.
The wind power annual effective electric quantity calculation steps are as follows:
step f 1: and calculating the downward peak shaving capacity of the coal-fired thermal power generating unit.
①, carrying out monthly typical daily power and electric quantity balance in open water, calculating monthly thermal power starting capacity, and calculating the technical minimum power sum P of all thermal power generating units according to the starting capacity of various thermal power generating unitsM,min。
PM.min＝PM.min1+PM.min2+PM.minN
In the formula: pM,min1、PM,min2、…PM,minNThe minimum output of the single thermal power generating unit technology is provided.
②, carrying out monthly average load daily electric power and electric quantity balance, and calculating hourly output P of the coal-fired thermal power generating unitM,t0。
③ calculating the downward peak load regulation capacity N of coal-fired thermal power generating unitdown。
Ndown＝PM.t0-PM.min
Step f 2: and acquiring wind power consumption electric quantity and abandoned wind electric quantity according to the downward peak regulation capacity of the thermal power.
Calculating the wind power consumption electric quantity at the current moment:
if the thermal power down-peak regulation capacity at the current moment is larger than the wind power output, the wind power consumption electric quantity is the wind power output at the current moment, and if the thermal power down-peak regulation capacity at the current moment is smaller than the wind power output, the wind power consumption electric quantity at the current moment is equal to the thermal power down-peak regulation capacity at the current moment.
In the formula: pwind.absFor the wind power consumption at the present moment, PwindThe wind power output at the current moment is obtained.
Calculating the wind power abandon amount at the current moment:
Pwind.dis＝Pwind-Pwind,abs
in the formula: pwind.disAbandoning the wind power for the current moment.
Step f 3: and (3) absorbing the abandoned wind by utilizing the pumping capacity:
the system has surplus heat reserve capacity in the low ebb period, if the system has the waste wind electric quantity at the time, the waste wind can be absorbed by using the pumping storage capacity, and the power is generated to replace the thermal power electric quantity in the load peak period, so that the system coal consumption is further saved; if the peak regulation of the water and electricity abandoned water exists, the peak regulation electric quantity of the water and electricity abandoned water is absorbed preferentially.
The specific calculation formula and description are as follows:
when the pumping capacity is smaller than the output of the water and electricity abandoned water, the electricity quantity absorbed by the abandoned wind is 0; when the pumping capacity deducts the hydroelectric waste water output and is larger than the waste wind output, the waste wind absorbed electric quantity is equal to the current waste wind output; and when the water-electricity water-abandoning output is deducted from the pumping storage capacity, the water-electricity water-abandoning output is smaller than the wind-electricity wind-abandoning output, and the electric quantity absorbed by the wind-abandoning is equal to the difference between the current pumping storage capacity and the water-electricity water-abandoning output.
In the formula: n is a radical ofPfTo extract storage capacity, PHdAnd regulating the peak output of the water and electricity abandoned water at the current moment.
Step f 4: and calculating the annual effective electric quantity and annual abandoned wind electric quantity of the wind power.
The wind power annual effective electric quantity calculation formula:
in the formula: and N is the time interval number of absorbing the abandoned wind during the low-valley period of the pumping storage. Eta is the conversion coefficient of the pumping power generation efficiency, and the value is 0.75;
calculating the annual abandoned wind electric quantity of the wind power:
6 schemes of pumped storage installed capacity of 0, 1200MW, 1500MW, 1800MW, 2100MW and 2400MW are planned in total, and wind power annual effective electric quantity is calculated;
table 8 plans a calculation statistical table of wind power effective electric quantity of each installed capacity scheme of pumped storage in the horizontal year:
as can be seen from Table 8, as the scale of the pumping and storage increases, the wind power consumption capability of the system is enhanced; when the system is configured with the pumping and storage scale of 1800MW, the system can increase the effective electric quantity of wind power by 3.03 hundred million kWh;
calculating the total coal fired quantity of the system:
the total annual coal consumption of the system corresponding to each pumped storage installed capacity scheme of the power system is calculated as follows: and f, after the step f is finished, obtaining the thermal power output process after the system absorbs the wind power, and determining the unit type of capacity increase and decrease from small to large according to the specified fuel consumption characteristic curve of the thermal power unit which is planned to be put into operation in the horizontal year. And calculating the coal-fired quantity according to the fuel consumption characteristic curves of the various units, summarizing the coal-fired quantity of the various units to obtain the thermal power coal-fired quantity at the moment, summarizing the coal consumption for 8760 hours to obtain the total coal-fired quantity of the system all the year round.
TABLE 9 calculation statistical table for coal combustion amount of each installed capacity scheme of horizontal year pumped storage
According to the table, as the capacity of the pumping storage installation is increased, the effective electric quantity of wind power is increased, the power generation quantity of thermal power is in a descending trend, and the coal burning quantity of the system is in a descending trend.
And calculating and planning the thermal power installed capacity corresponding to each installed capacity scheme of the horizontal year system.
And (3) an installed capacity optimization configuration scheme of the pumped storage power station.
On the premise of meeting the requirements of system electric power and electric quantity and various constraint conditions, the scheme (the current value of the total cost is minimum) for minimizing the total national economic expenditure of the system in the whole planning period is an optimized configuration scheme for the installed capacity of the pumped storage power station.
Table 10 total cost present value calculation basic data table:
table 11 plan horizontal year pumped storage each installed capacity plan economic comparison table
As can be seen from table 11, as the pumping capacity increases, the installed thermal power capacity required to be configured by the system decreases, and for the scheme in which the pumping capacity is less than or equal to 180 kW, the thermal power replacement rate is 100%; because the thermal power needs to bear 188 ten thousand kW in the planned horizontal year, if the pumping and storage installed capacity is further increased, no more thermal power needs to be replaced, the thermal power installed capacity needed by the system is maintained when the pumping and storage capacity is 210 ten thousand kW and 240 ten thousand kW, and the thermal power replacement rate is reduced. With the increase of the capacity of the pump storage device, the wind power absorbed by the system is increased, the required thermal power is in a descending trend, the wind power effective power coefficient reaches 99.56% when the pump storage capacity is 180 kW, and the improvement effect of the pump storage capacity on the wind power effective power is further increased. The total cost of the system is the lowest when the total cost is stored for 180 kW. Therefore, a pumping capacity of 180 kW is the recommended optimal configuration.
Table 12 shows a pumped storage peak-load-adjusting operation mode and an installed scale scheme economic comparison table of a pumped storage power station.
The pumped storage can effectively reduce the load peak-valley difference according to the peak-load-valley-load-peak-load operation mode, the thermal power peak-load-peak-load capacity is improved, and wind power absorption is facilitated. The wind power effective electric quantity is increased along with the increase of the installed capacity of the pump storage, but the thermal power generating capacity is in the increasing trend, and mainly because the pump storage peak-load-adjusting valley-filling mode is operated, in order to ensure the generating capacity of the pump storage at the peak every day, besides absorbing wind power abandoned wind, the system is required to generate more power at the valley period. As the thermal power operation condition is improved, although the thermal power quantity is increased, the coal burning quantity of the system is reduced along with the increase of the pumping storage capacity. The total cost of 210 ten thousand kW of pumping installed capacity in the pumping operation mode is the minimum, and the pumping operation mode is a relatively excellent capacity allocation scheme.
The two operation modes of pumping and storing have similar effect on promoting wind power consumption, and the operation mode of peak load regulation and valley filling is slightly superior. From the optimization result, the total cost of the heat reserve operation is 180 ten thousand kW, the peak load regulation operation is 210 ten thousand kW, and the heat reserve operation is 188 ten thousand kW, mainly because the thermal power is required to bear the heat reserve in the planning horizontal year, the thermal power replacement rate of the heat reserve operation 180 ten thousand kW is 100%, and the replacement rate of the installation is increased and reduced. And the pumped storage peak-load-adjusting valley-filling operation reduces the load peak-valley difference, the thermal power installation machine required to be configured in the system is carried out on the residual load curve after the head is flattened, so the pumped storage further increases the installation machine, the replacement rate of thermal power is still 100%, and the replacement rate of thermal power is less than 100% until the pumped storage installation machine occupies the hydroelectric working position in a crowded manner, the hydroelectric working position is idle, and the replacement rate of thermal power is less than 100%.
For a power system with large-scale wind power access, due to the randomness of wind power, no redundant power is stably supplied for pumping water in low valleys in other times except in windy weather, and the system is required to increase the low valley power generation amount for ensuring the power generation at the peak of pumping and storing; when the installed capacity of the pump storage is 2100MW, the system is required to increase the generated energy by 3.4 hundred million kWh in the valley period, and if a sufficient peak-valley time-sharing power price policy is not provided, the operation mode is difficult to maintain the financial survival of the pump storage power station; the thermal power installation scale of system planning is small, and hidden danger is brought to safe and stable operation of the system;
the standby operation of heat pumping and storage can maintain financial survival by establishing an electric power system auxiliary service market, and is practical and feasible.
Compared with the two operation modes, for a large-scale wind power accessed power system with strong randomness, the scale of the pumped storage optimized and configured according to the heat standby operation mode is small relative to the scale configured according to the peak load shifting operation mode, the system planning thermal power installation is large, the thermal power of the system is not required to be additionally increased to generate power, the objective reality of the power system is met, and the optimized configuration scheme is more reasonable.
The effect analysis of the invention: compared with the existing typical operation mode that wind power is unfavorable to participate in balance, the optimization method can accurately calculate the wind power effective electric quantity added by the pumped storage power station and the thermal power generation quantity and coal consumption which are correspondingly reduced due to the increase of wind power consumption aiming at the characteristic of randomness of wind power output, can reflect the influence of the pumped storage power station on the increase of the wind power effective electric quantity, the reduction of the thermal power installed capacity and the reduction of the thermal power coal consumption on the installed capacity of the pumped storage power station configured in the system, can specifically analyze the benefit of the pumped storage power station on promoting the efficient utilization of the wind power, and can reasonably optimize the installed capacity of the pumped storage power station of the power system with large-scale wind power access.
The operation mode of peak load shifting and valley filling is adopted, for a power system with strong wind power randomness, except in windy weather, extra power is not stably supplied for a long time to pump the storage valley, the system is required to increase the valley generating capacity for ensuring the generation of the peak load of the storage, and if the operation mode does not have a sufficient peak-valley time-sharing power price policy, the financial survival of the storage power station is difficult to maintain.
The standby operation of heat pumping and storage can maintain financial survival by establishing an electric power system auxiliary service market, and is practical and feasible. Compared with the two operation modes, the pumping and storage scale configured in the peak-load-adjusting operation mode is larger than 300MW, so that 15.6 million yuan of pumping and storage investment is wasted, and the thermal power installation scale of the corresponding system planning is smaller than 300MW, so that hidden troubles are brought to the safe and stable operation of the system. Therefore, for a large-scale wind power accessed power system, the optimal configuration scheme of the heat pumping and storage standby operation mode is more reasonable.
Claims (6)
1. The optimization method of the pump storage power station installation of the power system for promoting wind power consumption is characterized by comprising the following steps:
a. acquiring the forecast parameters of the horizontal annual load planned by the regional power system, wherein the forecast parameters comprise the highest power load, the power consumption, an annual load curve and a typical daily load curve;
b. acquiring operating parameters of a thermal power unit which is planned to be put into production and is specified in the horizontal year by the power system, wherein the operating parameters comprise single-machine capacity, technical minimum output and a fuel consumption characteristic curve of the thermal power unit to be put into production;
c. acquiring hydropower operation parameters which are clear in the planning horizontal year in the power system, wherein the parameters comprise the number of units, the capacity of a single machine, the average output and the expected output of each month in the horizontal year, the dry year and the dry year;
d. acquiring historical wind power data of a power system and planning horizontal year wind power 8760h output process prediction data;
e. obtaining various proposed power supply economic indexes including pumped storage power stations and thermal power unit kilowatt investment, operation rate, fixed asset residual value, standard coal price and current value coefficient;
f. calculating thermal power installed capacity and wind power annual effective electric quantity corresponding to each pumped storage installed capacity scheme of the power system;
g. calculating the total annual coal consumption of the system corresponding to each pumped storage installed capacity scheme of the power system;
h. and calculating the current value of the total cost of each pumped storage installed capacity scheme, so that the current value of the total cost of the system in the whole planning period is the minimum scheme, and the scheme is the installed capacity optimization scheme of the pumped storage power station.
2. The pumped storage power station installed optimization method for electric power system for promoting wind power consumption according to claim 1, characterized in that: in the step f, the wind power effective electric quantity calculation process comprises the following steps:
step f 1: calculating the downward peak regulation capacity of the coal-fired thermal power generating unit;
①, balancing the electricity quantity of the hydropower plants in the typical monthly day according to the hydropower operation parameters (average monthly output and expected monthly output in the open water year) in the step c, calculating the monthly thermal power starting capacity, and calculating the technical minimum output sum P of the monthly thermal power generating units according to the various thermal power single-machine capacities and the technical minimum output in the step bM,min；
PM.min＝PM.min1+PM.min2+PM.minN
In the formula: pM,min1、PM,min2、…PM,minNThe minimum output of a single thermal power generating unit technology is obtained;
②, carrying out monthly average load daily electric power and electric quantity balance, and calculating hourly output P of the coal-fired thermal power generating unitM,t0；
③ calculating the downward peak load regulation capacity N of coal-fired thermal power generating unitdown；
Ndown＝PM.t0-PM.min
Step f 2: acquiring wind power consumption electric quantity and wind abandon electric quantity according to the downward peak regulation capacity of thermal power:
calculating the wind power consumption electric quantity at the current moment:
obtaining forecast data of the wind power 8760h output process in the planned horizontal year according to the step d;
if the thermal power down-peak regulation capacity at the current moment is larger than the wind power output, the wind power consumption electric quantity is the wind power output at the current moment, and if the thermal power down-peak regulation capacity at the current moment is smaller than the wind power output, the wind power consumption electric quantity at the current moment is equal to the thermal power down-peak regulation capacity at the current moment;
in the formula: pwind.absFor the wind power consumption at the present moment, PwindWind power output at the current moment;
calculating the wind power abandon amount at the current moment:
Pwind.dis＝Pwind-Pwind,abs
in the formula: pwind.disAbandoning wind power for the current moment;
step f 3: the wind power is absorbed by the pumping capacity:
the principle is as follows: the system has surplus heat reserve capacity in the low ebb period, if the system has waste wind at the moment, the waste wind is absorbed by utilizing the pumping storage capacity, the thermal power generation amount is replaced in the load peak period, and the system coal consumption is saved; if the peak regulation electric quantity of the water-electricity abandoned water exists, the peak regulation electric quantity of the water-electricity abandoned water is absorbed preferentially;
the specific calculation formula and description are as follows:
when the pumping capacity is smaller than the output of the water and electricity abandoned water, the electricity quantity absorbed by the abandoned wind is 0; when the pumping capacity deducts the hydroelectric waste water output and is larger than the waste wind output, the waste wind absorbed electric quantity is equal to the current waste wind output; after the water and electricity abandoned water output is deducted from the pumping storage capacity, the water and electricity abandoned water output is less than the wind and electricity abandoned wind output, and the electricity quantity absorbed by the abandoned wind is equal to the difference between the current pumping storage capacity and the water and electricity abandoned water output:
in the formula: n is a radical ofpfTo draw storage capacity PHdRegulating the peak output of the water and electricity abandoned water at the current moment;
step f 4: calculating the annual effective electric quantity and annual abandoned wind electric quantity of the wind power;
the wind power annual effective electric quantity calculation formula:
in the formula: n is the number of time periods for absorbing the abandoned wind during the low-valley period of the suction storage; eta is the conversion coefficient of the pumping power generation efficiency, and the value is 0.75;
calculating the annual abandoned wind electric quantity of the wind power:
3. the pumped storage power station installed optimization method for electric power system for promoting wind power consumption according to claim 1, characterized in that: in the step f, the thermal power installed capacity calculation mode corresponding to each pumped storage installed capacity scheme of the system is as follows:
and c, balancing the electricity quantity of the electricity in a typical day by month according to the hydropower operation parameters (average power output and expected power output in the dry year) in the step c to obtain the thermal power installed capacity corresponding to each pumped storage installed capacity scheme of the system.
4. The pumped storage power station installed optimization method for electric power system for promoting wind power consumption according to claim 1, characterized in that: the electric power and electric quantity balance principle in the step f comprises the following contents:
1) the peak load of the daily load curve is borne by the hydropower with the adjusting performance, the forced output of the hydropower with the adjusting performance and the base load borne by the hydropower without the adjusting performance;
2) the thermal power bears the residual peak load, waist load and base load; the installed capacity is balanced, and the insufficient capacity is supplemented by thermal power;
3) the operation mode of the pumped storage unit is as follows: the method mainly bears heat reserve in the power system, when the load is in a low-ebb period, the system heat reserve has surplus, the storage capacity is used for absorbing the wind reserve capacity, the thermal power generating unit is replaced to generate power in a peak period, and the heat reserve borne by the thermal power generating unit is borne when the storage power generating unit is pumped;
4) the constraint:
power balance constraint: b, carrying out 24h power balance constraint on the system monthly typical day, wherein 24h power of the system monthly typical day is obtained according to the step a;
Dt＝NHt+NTt+NPt
in the formula: dtLoad of the power system at the time t; n is a radical ofHt、NTt、NPtRespectively the output of water, electricity, thermal power and pumped storage at the moment t, the wind power does not participate in the power balance, ② the system load and the accident reserve constraint
SH+ST+SP≥SD
SH≤SH.MAnd SP≤SP.M
In the formula SH、ST、SPSpare capacity for loads and accidents borne by hydroelectric, thermal and pumped storage, SDThe system needs load and spare capacity for accidents. SH.M、SP.MMaximum load and accident reserve capacity can be provided for water, electricity and pumped storage;
the electric quantity balance constraint is that the electric quantity needed by the electric power system month by month is equal to the sum of the generated energy of various power supplies; the monthly electricity demand of the system is obtained according to the step a in claim 1;
ED＝EH+ET+EW+EP
in the formula: eDThe amount of electricity needed by the power system month by month; eH、ET、EW、EPRespectively water, fire, wind,Generating capacity of the pumped storage power station;
pumping and generating balance constraint of a pumped storage power station:
EGPi＝ηi·EPPi
in the formula: eGPi、EPPiη is the generated energy and pumped electricity quantity of the pumped storage power station wind abandoning days respectivelyiThe value is 0.75 for the conversion efficiency of pumping and generating electricity;
fourthly, various power station operation constraints: the thermal power technology minimum output constraint and the installed capacity constraint are constrained according to the thermal power operation parameter in the step b of claim 1; hydropower station installed capacity, expected output and forced output constraints are constrained according to hydropower operation parameter constraints in the step c of claim 1; the installed capacity of the pumped storage power station is restricted;
electric overhaul restraint: the maintenance time of the thermal power generating unit is 45 days, and the maintenance time is arranged in a water and electricity abundance period of 5-10 months;
sixthly, hydroelectric maintenance restriction: the maintenance time of the hydroelectric generating set is 30 days, and the hydroelectric generating set is arranged in a withering period of 11 months to 4 months in the next year, wherein the hydroelectric generating set has small electric output;
5) balancing electric power quantity by adopting a horizontal year and a dry year for month-by-month balancing, and calculating thermal power installed capacity corresponding to each pumped storage installed capacity scheme of the power system by adopting a designed dry year; wind power absorption electric quantity and system annual coal consumption total quantity corresponding to each pumped storage installed capacity scheme of the power system adopt design horizontal annual calculation results.
5. The pumped storage power station installed optimization method for electric power system for promoting wind power consumption according to claim 1, characterized in that:
in the step g, the total annual coal consumption of the system corresponding to each pumped storage installed capacity scheme of the power system is calculated in the following mode: after the step f is finished, obtaining the thermal power output process after the system absorbs the wind power,
b, planning a fuel consumption characteristic curve of the thermal power generating units which are determined and planned to be put into production in the horizontal year, determining the type of the thermal power generating units with the capacity increased and decreased from small to large by slightly increasing the coal consumption, so as to obtain the hourly output of various units, calculating the coal combustion amount by the fuel consumption characteristic curve of various units, summarizing the coal combustion amount of various units to obtain the thermal power coal combustion amount at the moment, summarizing the coal consumption for 8760 hours, and obtaining the total coal combustion amount of the system in the whole year.
6. The method for optimally configuring installed capacity of pumped storage power stations of power systems for promoting wind power consumption according to claim 1, wherein the method comprises the following steps:
in the step h, the economic and reasonable scheme for optimally configuring the installed capacity of the pumped storage power station of the power system is a scheme for minimizing the current value of the total cost of the system in the whole planning period on the premise of meeting the system requirements and various constraint conditions; the function expression with the lowest total cost current value is as follows:
in the formula: minPC is the minimum cost of the system; n is the planning period, t is the number of years;
i is the investment of fixed assets of the power station, including the investment of pumped storage and thermal power fixed assets, and is obtained by multiplying the installed capacity of pumped storage and the installed capacity of thermal power by the investment of pumped storage and the kilowatt of thermal power units respectively; calculating the thermal power installed capacity corresponding to each pumped storage installed capacity scheme of the system according to the step f; e, acquiring pumped storage power stations and kilowatt investment of thermal power units;
the operation charge of the power station is Oc, comprises pumped storage and thermal power operation charge, and is obtained by multiplying the investment of pumped storage power station and thermal power fixed assets by corresponding operation charge rate; and e, obtaining the operation rates of the pumped storage power station and the thermal power plant according to the step e.
F is the system fuel cost, and is obtained by multiplying the total coal consumption of the system calculated in the step g by the price of the standard coal; and e, obtaining the price of the marked coal according to the step e.
Sv is a fixed asset residual value recovered at the end of the calculation period; obtaining according to the step e;
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