CN108133322A - Power and electric quantity balance index calculation method based on time sequence operation simulation - Google Patents
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Abstract
The invention relates to a power and electric quantity balance index calculation method based on time sequence operation simulation, which comprises the following steps: and (3) power balance index and calculation: obtaining the profit and loss control time interval and the peak regulation control time interval of each month according to the operation simulation data of each month, and then calculating 11 types of power balance indexes of each month by using the profit and loss control time interval and the peak regulation control time interval; the 11-class power balance indexes per month comprise system capacity, system installation, nuclear power utilization, energy storage utilization, hydropower utilization, thermal power utilization, peak regulation utilization, wind and light utilization, insufficient peak regulation and other indexes of power; and (3) electric quantity balance index and calculation: respectively calculating the annual and monthly total load demand, the generating capacity of various units, the wind and light consumption and the utilization hours of various units according to the 8760-point operation simulation result, and evaluating the electric quantity balance condition of the planning scheme according to the obtained indexes; the electric quantity balance indexes comprise system electricity demand, nuclear power generation, energy storage balance, water and electricity availability, peak regulation power generation, thermal power generation, wind and light availability and utilization hours.
Description
Technical Field
The invention relates to the field of power system analysis, in particular to a power electric quantity balance index calculation method based on time sequence operation simulation.
Background
With the rapid development of new energy and the unbalance between the power demand and the production area, new challenges are provided for the overall and regional power and electricity balance in the power system planning process. On one hand, the situation that the distribution of the Chinese economic load center and the energy base is unbalanced is aggravated, and the flow of electric power and electricity is more active across provinces and regions; on the other hand, the output fluctuation of large-scale renewable energy sources such as wind and light is strong and difficult to predict, and meanwhile, the problem of renewable energy consumption is prominent in areas lacking adjustable units and outgoing channels.
Conventional power balancing mainly includes power balancing and power balancing. The power balance is the balance of power generation power, power load and network loss of a power supply in a power grid, and the main contents comprise power supply working capacity calculation, standby capacity calculation, power balance check and the like. The electric quantity balance is the balance between the required electric quantity of a power grid and the generated electric quantity of each power plant in a system in a planning period, and the main contents comprise calculation of the generated electric quantity of various power supplies, calculation of the utilization hours of various power supplies, electric quantity balance check and the like.
Generally, for a power grid mainly comprising a thermal power generating unit, a typical daily load curve can be selected for manual calculation; for a relatively complex power grid with high water and electricity occupation, software-assisted calculation can be performed, such as joint power system operation simulation software and national grid operation simulation software. The traditional methods for determining the power-electricity balance by selecting a typical operation mode and a typical daily load curve for operation simulation mainly have the following defects: (1) the operation simulation of a typical load day is only carried out to obtain a result of electric power and electric quantity balance which is too rough, so that the requirement of the power grid planning current situation with more changeable operation modes on refinement is difficult to meet; (2) the proportion of renewable energy sources such as wind, light and the like in a power grid is gradually improved, uncertainty is strong, and a traditional simple processing mode for power and electric quantity balance is difficult to apply; (3) the indexes of the power and electric quantity balance need to be further enriched, and a more comprehensive index system is needed to reflect the utilization rate of renewable energy sources, the electric quantity abandonment, the peak regulation condition of each type of unit and the like.
Disclosure of Invention
In view of the above problems, an object of the present invention is to provide a power and power balance index calculation method based on time sequence operation simulation, which is based on the result of a refined time sequence operation simulation technique, so as to deal with the challenges of power system planning caused by high-proportion new energy networking, insufficient peak shaving capacity and unbalanced distribution of regional energy and load center, and improve the refinement level and accuracy of power and power balance of a power system.
In order to achieve the purpose, the invention adopts the following technical scheme: a power electric quantity balance index calculation method based on time sequence operation simulation is characterized by comprising the following steps: 1) and (3) power balance index and calculation: based on the result of the refined operation simulation, obtaining the profit and loss control time period and the peak regulation control time period of each month from the existing operation simulation data of each month, and then calculating 11 types of power balance indexes of each month by using the profit and loss control time period and the peak regulation control time period; the peak load regulation control period refers to a typical daily peak load period in the month, the load refers to a system load consideration out-of-area protocol, specified output in an area and equivalent load for discharging a plan after new energy; the 11-class power balance indexes per month comprise system capacity, system installation, nuclear power utilization, energy storage utilization, hydropower utilization, thermal power utilization, peak regulation utilization, wind and light utilization, insufficient peak regulation and other indexes of power; 2) and (3) electric quantity balance index and calculation: based on the result of the refined operation simulation, respectively calculating the annual and monthly total load demand, the generating capacity of various units, the wind and light consumption and the utilization hours of various units according to the 8760-point operation simulation result, and evaluating the electric quantity balance condition of the planning scheme according to the obtained indexes; the various electric quantity balance indexes comprise system electricity demand, nuclear power generation, energy storage balance, availability of water and electricity, peak regulation power generation, thermal power generation, availability of wind and light and utilization hours.
Further, in the step 1), the demanded capacity is a capacity required by the power system in a typical monthly profit and loss control period:in the formula, PsysIn order to keep the required capacity,for the power generation load that is the load for the profit-loss control period,in order to have a spare capacity,in order to send out the electric power,the power is purchased outside; wherein the spare capacityComprises the following steps:in the formula,for the spinning reserve of the profit-loss control period,for the maintenance and standby in the profit and loss control period,the machine is stopped for standby in the profit and loss control period.
Further, in the step 1), the system is installed CsysThermal power installation machine comprising profit and loss control time periodWater and electricity installationNuclear power installation machinePumped storage loaderPeak regulator assembling machineWind power installation machinePhotovoltaic installationAnd other machines
Nuclear power utilizationRefers to the output and the base load of the nuclear power unit at the profit and loss control periodOutput for peak regulation control period, nuclear power peak loadThe part bearing the peak load for nuclear power:
energy storage utilizationFor the demand of profit and loss control period to the pumping capacity:wherein,in order to store energy and generate electricity,for energy storage and standby.
Further, in the step 1), water and electricity are utilizedIn order to meet and lose the demand on the hydropower capacity at the control moment:
wherein,in order to be operated by water and electricity,the water and electricity are reserved, and the water and electricity work is the output of the water and electricity at the profit and loss moment; the water and electricity standby is the water and electricity rotation standby at the moment;
the thermal power utilization is the utilization condition of thermal power in the profit and loss control period, and the thermal power utilizationThe method comprises two parts of thermal power work and thermal power standby:in which the thermal power worksThe output in the thermal power excess and deficiency control period is referred to;for the standby of thermal power:in the formula,rotating for standby during the period of controlling the excess and deficiency of the thermal power;stopping for standby in the period of thermal power profit and loss control;and thermal power overhaul is standby in the thermal power profit and loss control period.
Further, in the step 1), peak shaving utilization is performedThe engine is described in a typical time of day using conditions:peak shaving workThe output at the profit and loss moment of the gas turbine is obtained; regulating peak for standbyComprises the following steps:
wherein,rotating the gas turbine for standby;the machine is stopped for standby;
the wind and light utilization refers to the output in the wind and electricity profit and loss control time period, and the photovoltaic utilization refers to the output in the photovoltaic profit and loss control time period.
Further, in the step 1), the index of the insufficient peak regulation series reflects the degree and influence of the insufficient peak regulation, if the system is sufficient in rotation and has a load shedding, the problem is peak regulation, and the capacity P of the insufficient peak regulation isf,lkComprises the following steps:
wherein,the load is cut at the moment of controlling the profit and loss,means spare capacity; the maximum water abandoning power is the water abandoning power in the peak regulation control period, the maximum water abandoning power base charge is the water abandoning power in the profit-deficit control period, the wind abandoning power is the wind abandoning power in the peak regulation control period, and the light abandoning power is the light abandoning power in the peak regulation control period.
Further, in the step 1), other indexes of the electric power are as follows: (1) if no load shedding is generated and the standby requirement is met, the thermal power requirement Pc,ndComprises the following steps:otherwise, P is required for thermal powerc,ndComprises the following steps:wherein,the thermal power is utilized;overhauling the thermal power;the power is insufficient, and the power is insufficient to control load shedding at the time interval;for spare shortage, spare shortage means that if a shutdown is scheduled for spare, spare is not enough, then the spare requirement is subtractedActual spinning reserve and shutdown reserve capacity, zero if there is a remainder for a scheduled shutdown reserve; (2) if one of the power shortage and the spare shortage is negative, the power surplus is obtainedComprises the following steps:otherwise, surplus electric powerComprises the following steps:(3) external power supply base chargeDelivering power for peak regulation control period; peak load of delivered powerComprises the following steps:wherein,the electric power is delivered during the profit and loss control period; (4) external electric power base chargeThe method refers to outsourcing electric power in a peak regulation control period; peak load of external powerComprises the following steps:wherein,the method refers to buying power outside during the profit and loss control period.
Further, in the step 2), the demand electric quantity W is determinedsysFor the net electrical demand of the system per year or per month:
Wsys＝Wd+Wa-Ws
wherein, WdThe total electric quantity of the load in the area within a preset statistical time period is calculated; waPurchasing total electric quantity inside and outside a region within a preset statistical time period; wsThe method comprises the steps of (1) distinguishing the total electric quantity sold outside in a preset statistical time period;
the nuclear power generation is the total nuclear power generation amount and the peak load of each year or each monthAnd base chargeRespectively as follows:
wherein,the peak load of all nuclear power generating units in the ith time period;the power generation capacity is the base load power generation capacity of all nuclear power generating units in the ith time period, and N is the hours of the statistical time period;
energy storage balance Wp,balaThe total electricity generation and energy storage situation is described as pumped annually or monthly:
Wp,bala＝Wp,gen-Wp,use
wherein the generated electricity quantity Wp,genThe total power generation of the pump storage unit is within a preset statistical time period; power consumption W of pumped storagep,useThe total energy consumption of the storage unit is within a preset statistical time period.
Further, in the step 2), the hydropower can be used as the total hydropower generation amount per year or per month; peak load of water and electricityAnd base chargeRespectively as follows:
wherein,the peak load of all water and electricity in the ith time period;the generated electric quantity is the base charge generated electric quantity of the ith time interval, and N is the number of statistical time intervals;
the peak regulation power generation is the total power generation of the gas turbine every year or every month, and the peak load of the peak regulation unitAnd base chargeRespectively as follows:
wherein,the peak load of all the gas turbine units in the ith time period;the generated electric quantity is the base charge generated electric quantity of the ith time interval, and N is the number of statistical time intervals.
Further, in the step 2), the thermal power generation is the total thermal power generation amount and the peak load of the thermal power in each year or each monthAnd base chargeRespectively as follows:
wherein,the peak load of all thermal power generating units in the ith time period;the generated electric quantity is the base charge generated electric quantity of the ith time interval, and N is the number of statistical time intervals;
wind-solar energy including wind-electricity energyPhotovoltaic usableWind power generation WwPhotovoltaic power generation WpvWaste wind power Ww,rdLight quantity of sum light and discard Wpv,rd(ii) a Wherein wind power is availablePhotovoltaic usableUnder the condition of no abandoned wind and abandoned light, the wind power generation W is the natural maximum power generation amount of wind power and photovoltaic in a preset statistical time periodwPhotovoltaic power generation WpvThe method comprises the following steps of (1) determining the actual wind power and photovoltaic power generation within a preset statistical time period;
utilization hours: the utilization hours of a certain type of units are the operation hours T when the actual generated energy of all the units of the type is converted into the total rated generated energy:
wherein, WiGenerating capacity of an ith unit of a certain type in a statistical time interval; ciThe unit capacity of the ith unit of a certain type in the statistical time period is obtained, and M is the number of the unit of the ith unit of the certain type in the statistical time period.
Due to the adoption of the technical scheme, the invention has the following advantages: 1. according to the invention, a more comprehensive index system is established, and a new electric power and electric quantity index suitable for evaluating new energy such as wind power, photovoltaic and the like, the condition of electric power and electric quantity delivery and the condition of peak shaving is designed while the traditional electric power and electric quantity balance index is reflected. 2. According to the method, the power and electric quantity balance index is calculated based on the refined time sequence operation simulation result of the power system, the power and electric quantity balance conditions of various types of units are provided, and more variable power system operation modes can be reflected. 3. The method and the device can improve the precision and accuracy of the power and electric quantity balance of the power system and improve the refinement level of the power grid and new energy planning. 4. The method can more comprehensively understand the consumption condition of the new energy unit, the peak shaving condition of the flexible unit, the balance condition of each type of conventional unit and the extreme condition of the power system in a variable operation mode, is favorable for scientifically analyzing factors influencing the consumption of new energy, reasonably plans the capacity, the grid structure and the regional energy distribution of the peak shaving unit, and improves the scientific and fine level of the power and electric quantity balance of the power system, thereby having important practical significance and good application prospect.
Drawings
FIG. 1 is a schematic diagram of a power balance index system according to the present invention;
FIG. 2 is a diagram of the system demand capacity and sub-indicator of the present invention;
FIG. 3 is a schematic diagram of the system installation and sub-indicators thereof according to the present invention;
FIG. 4 is a schematic diagram of nuclear power utilization and sub-indices thereof in accordance with the present invention;
FIG. 5 is a schematic diagram of energy storage utilization and sub-indices thereof according to the present invention;
FIG. 6 is a schematic diagram of the utilization of hydropower and its sub-indexes in accordance with the present invention;
FIG. 7 is a schematic diagram of thermal power utilization and sub-indicators thereof according to the present invention;
FIG. 8 is a schematic diagram of peak shaving utilization and sub-indicators thereof according to the present invention;
FIG. 9 is a schematic diagram of wind and light utilization and sub-indicators thereof according to the present invention;
FIG. 10 is a schematic diagram of the peak shaving deficiency and sub-indicators thereof according to the present invention;
FIG. 11 is a schematic diagram of other indicators of power according to the present invention;
FIG. 12 is a diagram of a system for indicating charge balance according to the present invention;
FIG. 13 is a diagram illustrating the energy demand and sub-indicators thereof according to the present invention;
FIG. 14 is a schematic illustration of a nuclear power generation and sub-indices thereof according to the present invention;
FIG. 15 is a schematic diagram of the energy storage balance and sub-indices thereof according to the present invention;
FIG. 16 is a schematic representation of the hydroelectricity availability and sub-specifications of the present invention;
FIG. 17 is a schematic diagram of peak shaving power generation and sub-indices thereof according to the present invention;
FIG. 18 is a schematic diagram of the thermal power generation and sub-indices thereof of the present invention;
FIG. 19 is a schematic illustration of the wind and light availability and sub-indices thereof according to the present invention;
FIG. 20 is a diagram illustrating utilization hours and sub-indicators thereof according to the present invention.
Detailed Description
The invention is described in detail below with reference to the figures and examples.
As shown in fig. 1, the present invention provides a power and electric quantity balance index calculation method based on time sequence operation simulation, which is used for reflecting new energy sources such as wind power, photovoltaic and the like, power utilization and balance conditions of different types of conventional units, and power delivery and peak shaving power balance conditions, and includes the following steps:
1) and (3) power balance index and calculation:
the results of the simulation were run based on refinements, as shown in fig. 1. Firstly, obtaining the profit and loss control time interval and the peak regulation control time interval of each month according to the existing monthly operation simulation data, and then calculating 11 types of power balance indexes of each month by using the profit and loss control time interval and the peak regulation control time interval; the profit-loss control period refers to a typical daily peak-to-load period in the month, and the peak regulation control period refers to a typical daily valley-to-load period in the month (here, the load refers to a system load consideration out-of-area agreement, an in-area specified output and an equivalent load for discharging a plan after a new energy source).
The 11 types of power balance indexes per month are as follows:
1.1) required capacity of system
As shown in fig. 2, the index reflects the demand of the installed and spare capacity of the power system. The system demand capacity is the capacity required by the power system in the typical daily profit and loss control period of the month, describes the maximum capacity required by the power system, and can be calculated according to the following formula:
in the formula, PsysIn order to keep the required capacity,for the power generation load that is the load for the profit-loss control period,in order to have a spare capacity,in order to send out the electric power,is outsourcing power. Wherein the spare capacityComprises the following steps:
in the formula,for the spinning reserve of the profit-loss control period,for the maintenance and standby in the profit and loss control period,the machine is stopped for standby in the profit and loss control period.
Radical chargeLoad for peak-shaving control period, peak-to-valley differenceComprises the following steps:
whereinThe load of the control period is gained or lost.
1.2) System installation
As shown in fig. 3, the index reflects the installed sizes of the power system and various units. System installation CsysThermal power installation machine comprising profit and loss control time periodWater and electricity installationNuclear power installation machinePumped storage loaderPeak regulator assembling machineWind power installation machinePhotovoltaic installationAnd other machinesEtc. can be calculated from the following formula:
1.3) nuclear power utilization
As shown in FIG. 4, the indexes reflect the output of nuclear power in a typical time period. Nuclear power utilizationRefers to the output and the base load of the nuclear power unit at the profit and loss control periodThe output in the peak regulation control period is obtained. Nuclear peak chargeThe portion responsible for peak charge for nuclear power can be calculated as follows:
the nuclear power overhaul capacity is the sum of the capacities of all nuclear power overhaul units at the profit and loss control moment.
1.4) energy storage utilization
As shown in fig. 5, the index reflects the pumping capacity and the reserve condition. Energy storage utilizationThe demand for pumping capacity for the break-even control period may be calculated by:
wherein,in order to store energy and generate electricity,for energy storage and standby.
The energy storage and power generation is the output of drawing storage at the profit and loss control moment; the energy storage reserve is the capacity of pumping and storing without participating in maintenance; the energy storage valley filling is the pumped storage output in the peak regulation control period; the overhaul capacity is the sum of the overhaul capacities of all the pumping storage units.
1.5) Water and Power utilization
As shown in fig. 6, the indexes reflect the capacity of water and electricity and the reserve condition. Water and electricity utilizationTo meet and lose the demand for hydropower capacity at the control moment, the following formula can be used for calculation:
wherein,in order to be operated by water and electricity,is waterAnd (5) powering for standby. The water and electricity work is the output at the moment when the water and electricity are full and insufficient; the hydroelectric power is reserved for rotation at the moment.
Water electric base chargeThe hydropower output at the peak regulation moment is obtained; peak load of water and electricityComprises the following steps:
wherein,the hydroelectric power is controlled at the moment for profit and loss.
The forced output is the minimum output which is required by the hydropower station to generate electricity to meet the water consumption of a downstream water consumption department at the profit and loss moment; the expected profit and loss moment is the maximum possible output of the hydropower station in a certain time period and is related to the hydrological condition of the time period; the average output is the average of typical in-day hydropower station outputs.
The spare capacity is the other shutdown capacity after the shutdown standby is scheduled to be completed.
1.6) thermal power utilization
As shown in fig. 7, the indexes reflect thermal power capacity and backup situations. The thermal power utilization is the utilization condition of thermal power in the profit and loss control period, and specifically the thermal power utilizationThe method comprises two parts of thermal power work and thermal power standby:
in which the thermal power worksThe output in the thermal power excess and deficiency control period is referred to;for the standby of thermal power:
in the formula,rotating for standby during the period of controlling the excess and deficiency of the thermal power;stopping for standby in the period of thermal power profit and loss control;and thermal power overhaul is standby in the thermal power profit and loss control period.
The thermal power starting refers to the total thermal power starting capacity in the profit and loss period; the thermal power spare capacity refers to other shutdown capacity after the shutdown standby is scheduled to be finished.
Thermal power base loadThe hydropower output at the peak regulation moment is obtained; peak load of thermal powerComprises the following steps:
wherein,the output of thermal power at the moment is controlled for profit and loss.
1.7) peak shaving utilization
As shown in fig. 8, such indices reflect engine capacity and back-up. Peak shaving utilizationA typical time of day utilization state of the combustion engine is described, defined as:
peak shaving workThe output at the profit and loss moment of the gas turbine is obtained; regulating peak for standbyComprises the following steps:
wherein,rotating the gas turbine for standby;for standby during shutdown.
Radical chargeThe output of the gas turbine at the peak shaving moment; corresponding peak chargeComprises the following steps:
wherein,the output of the combustion engine at the control moment is controlled to be full or full.
The overhaul capacity is the amount of overhaul scheduled at the profit and loss control moment of the combustion engine; the free capacity refers to the additional shutdown capacity of the combustion engine after the engine is scheduled to be shut down for standby.
1.8) wind and light utilization
As shown in fig. 9, the wind power utilization refers to the output in the wind power excess and deficiency control period, and the photovoltaic utilization refers to the output in the photovoltaic excess and deficiency control period.
1.9) insufficient peak regulation
As shown in fig. 10, the peak shaver deficiency index reflects the degree and influence of the peak shaver deficiency. If the system has enough reserve but has load shedding, the system is a problem of peak shaving, and the capacity P is insufficient for peak shavingf,lkComprises the following steps:
wherein,the load is cut at the moment of controlling the profit and loss,refers to spare capacity.
The maximum water abandoning power is the water abandoning power in a peak regulation control period (determined by adopting reverse peak regulation), the maximum water abandoning power base charge is the water abandoning power in a profit-loss control period (determined by adopting reverse peak regulation), the wind abandoning power is the wind abandoning power in a peak regulation control period, and the light abandoning power is the light abandoning power in a peak regulation control period. The series of indexes have reference value for peak regulation research of wind abandonment, light abandonment and water abandonment.
1.10) other indicators of power, as shown in FIG. 11:
(1) if no load shedding is generated and the standby requirement is met, the thermal power requirement Pc,ndComprises the following steps:
otherwise, P is required for thermal powerc,ndComprises the following steps:
wherein,the thermal power is utilized;overhauling the thermal power;the power is insufficient, and the power is insufficient to control load shedding at the time interval;spare deficit means that if a shutdown spare is scheduled out, the spare is still insufficient, the actual spinning spare and shutdown spare capacity is subtracted from the spare request, and if a shutdown spare is scheduled out, there is a remainder, zero.
(2) If one of the power shortage and the spare shortage is negative, the power surplus is obtainedComprises the following steps:
otherwise, surplus electric powerComprises the following steps:
(3) external power supply base chargeDelivering power for peak regulation control period; peak load of delivered powerComprises the following steps:
wherein,the electric power is delivered during the profit and loss control period.
(4) External electric power base chargeThe method refers to outsourcing electric power in a peak regulation control period; peak load of external powerComprises the following steps:
wherein,the method refers to buying power outside during the profit and loss control period.
2) And (3) electric quantity balance index and calculation:
the results of the simulation were run based on the refinement, as shown in fig. 12. And respectively calculating the annual and monthly total load demand, the generating capacity of various units, the wind and light consumption and the utilization hours of various units according to the 8760-point operation simulation result, and evaluating the electric quantity balance condition of the planning scheme according to the obtained indexes.
The various electric quantity balance indexes are as follows:
2.1) is the power demand
As shown in fig. 13, this type of index describes the various types of power demands of the system throughout the year and month. Is the electricity demand WsysFor the net electrical demand of the system per year or per month:
Wsys＝Wd+Wa-Ws(21)
wherein, WdThe total electric quantity of the load in the area within a preset statistical time period is calculated; waPurchasing total electric quantity inside and outside a region within a preset statistical time period; wsThe total electricity sold in the area within the preset statistical time period is disclosed.
2.2) Nuclear Power Generation
As shown in FIG. 14, the indexes describe the electricity generation of the nuclear power all year round and every month. The nuclear power generation is the total nuclear power generation amount per year or per month. Nuclear peak chargeAnd base chargeRespectively as follows:
wherein,the peak load of all nuclear power generating units in the ith time period;the number of the generated electricity is the base load electricity generation quantity of all nuclear power units in the ith time period, and N is the hours in the statistical time period.
2.3) energy storage Balancing
As shown in fig. 15, the indexes describe the power generation amount and power consumption of the pumped storage unit all the year and month. Energy storage balance Wp,balaThe total electricity generation and energy storage situation is described as pumped annually or monthly:
Wp,bala＝Wp,gen-Wp,use(23)
wherein the generated electricity quantity Wp,genThe total power generation of the pump storage unit is within a preset statistical time period; power consumption W of pumped storagep,useThe total energy consumption of the storage unit is within a preset statistical time period.
2.4) Water electric availability
As shown in fig. 16, such indices describe the power generation of hydropower all year and month. Hydropower can be used as the total generation of hydropower per year or per month.
Peak load of water and electricityAnd base chargeRespectively as follows:
wherein,the peak load of all water and electricity in the ith time period;the generated electric quantity is the base charge generated electric quantity of the ith time interval, and N is the number of statistical time intervals.
Electric quantity W of waste waterh,rdComprises the following steps:
Wh,rd＝Wh,ca-Wh(25)
wherein, Wh,caFor water and electricity to generate electricity, WhIs the total power generation of the hydropower.
2.5) Peak shaving Power Generation
As shown in fig. 17, such indices describe the power generation amount of the engine unit throughout the year and month. Peak shaving power generation is the total power generation of the combustion engine per year or per month.
Peak load of peak regulating machine setAnd base chargeRespectively as follows:
wherein,the peak load of all the gas turbine units in the ith time period;the generated electric quantity is the base charge generated electric quantity of the ith time interval, and N is the number of statistical time intervals.
2.6) thermal power generation
As shown in fig. 18, this type of index describes the power generation amount of thermal power for all the year and every month. The thermal power generation is the total thermal power generation amount per year or per month.
Wherein, the peak load of the thermal powerAnd base chargeRespectively as follows:
wherein,the peak load of all thermal power generating units in the ith time period;the generated electric quantity is the base charge generated electric quantity of the ith time interval, and N is the number of statistical time intervals.
2.7) wind and light available
As shown in fig. 19, the wind-solar availability describes the total generation and consumption of wind and photovoltaic units per year or per month. Wind-solar energy including wind-electricity energyPhotovoltaic usableWind power generation WwPhotovoltaic power generation WpvWaste wind power Ww,rdLight quantity of sum light and discard Wpv,rd。
Wherein wind power is availablePhotovoltaic usableThe wind power and photovoltaic natural maximum power generation amount in a preset statistical time period is preset under the condition of no abandoned wind and abandoned light. Wind power generation WwPhotovoltaic power generation WpvThe method is used for measuring the wind power and photovoltaic actual power generation within a preset statistical time period.
Wind power abandon Ww,rdPhotoelectric power Wpv,rdRespectively as follows:
the available series indexes of wind and light have practical guiding value for researching the wind and light abandoning electric quantity and corresponding influence factors in the preset time period and taking planning measures in advance for improving the consumption of wind power and photovoltaic power.
2.8) utilization hours
As shown in fig. 20, the class index describes the annual and monthly utilization of each type of unit. The utilization hours of a certain type of unit is the operation hours T when the actual generated energy of all the units of the type is converted into the total rated generated energy, and can be calculated according to the following formula:
wherein, WiGenerating capacity of an ith unit of a certain type in a statistical time interval; ciThe unit capacity of the ith unit of a certain type in the statistical time period is obtained, and M is the number of the unit of the ith unit of the certain type in the statistical time period.
The above embodiments are only for illustrating the present invention, and the structure, size, arrangement position and shape of each component can be changed, and on the basis of the technical scheme of the present invention, the improvement and equivalent transformation of the individual components according to the principle of the present invention should not be excluded from the protection scope of the present invention.
Claims (10)
1. A power electric quantity balance index calculation method based on time sequence operation simulation is characterized by comprising the following steps:
1) and (3) power balance index and calculation: based on the result of the refined operation simulation, obtaining the profit and loss control time period and the peak regulation control time period of each month from the existing operation simulation data of each month, and then calculating 11 types of power balance indexes of each month by using the profit and loss control time period and the peak regulation control time period; the peak load regulation control period refers to a typical daily peak load period in the month, the load refers to a system load consideration out-of-area protocol, specified output in an area and equivalent load for discharging a plan after new energy;
the 11-class power balance indexes per month comprise system capacity, system installation, nuclear power utilization, energy storage utilization, hydropower utilization, thermal power utilization, peak regulation utilization, wind and light utilization, insufficient peak regulation and other indexes of power;
2) and (3) electric quantity balance index and calculation: based on the result of the refined operation simulation, respectively calculating the annual and monthly total load demand, the generating capacity of various units, the wind and light consumption and the utilization hours of various units according to the 8760-point operation simulation result, and evaluating the electric quantity balance condition of the planning scheme according to the obtained indexes;
the various electric quantity balance indexes comprise system electricity demand, nuclear power generation, energy storage balance, availability of water and electricity, peak regulation power generation, thermal power generation, availability of wind and light and utilization hours.
2. The method of claim 1, wherein: in the step 1), the system required capacity is the capacity required by the power system in the typical monthly profit and loss control period:
in the formula, PsysIn order to keep the required capacity,for the power generation load that is the load for the profit-loss control period,in order to have a spare capacity,in order to send out the electric power,the power is purchased outside; wherein the spare capacityComprises the following steps:
in the formula,for the spinning reserve of the profit-loss control period,for the maintenance and standby in the profit and loss control period,the machine is stopped for standby in the profit and loss control period.
3. The method of claim 1, wherein: in the step 1), the system is installed CsysThermal power installation machine comprising profit and loss control time periodWater and electricity installationNuclear power installation machinePumped storage loaderPeak regulator assembling machineWind power installation machinePhotovoltaic installationAnd other machines
Nuclear power utilizationRefers to the output and the base load of the nuclear power unit at the profit and loss control periodOutput for peak regulation control period, nuclear power peak loadThe part bearing the peak load for nuclear power:
energy storage utilizationFor the demand of profit and loss control period to the pumping capacity:
wherein,in order to store energy and generate electricity,for energy storage and standby.
4. The method of claim 1, wherein: in the step 1), hydropower utilizationIn order to meet and lose the demand on the hydropower capacity at the control moment:
wherein,in order to be operated by water and electricity,the water and electricity are reserved, and the water and electricity work is the output of the water and electricity at the profit and loss moment; the water and electricity standby is the water and electricity rotation standby at the moment;
the thermal power utilization is the utilization condition of thermal power in the profit and loss control period, and the thermal power utilizationThe method comprises two parts of thermal power work and thermal power standby:
in which the thermal power worksThe output in the thermal power excess and deficiency control period is referred to;for the standby of thermal power:
in the formula,rotating for standby during the period of controlling the excess and deficiency of the thermal power;stopping for standby in the period of thermal power profit and loss control;and thermal power overhaul is standby in the thermal power profit and loss control period.
5. The method of claim 1, wherein: in the step 1), peak shaving utilizationThe engine is described in a typical time of day using conditions:
peak shaving workThe output at the profit and loss moment of the gas turbine is obtained; regulating peak for standbyComprises the following steps:
wherein,rotating the gas turbine for standby;the machine is stopped for standby;
the wind and light utilization refers to the output in the wind and electricity profit and loss control time period, and the photovoltaic utilization refers to the output in the photovoltaic profit and loss control time period.
6. The method of claim 1, wherein: in the step 1), the series of indexes of insufficient peak regulation reflect the degree and influence of insufficient peak regulation, if the system is sufficient in rotation and has a load cut, the problem is peak regulation, and the capacity P of insufficient peak regulation isf,lkComprises the following steps:
wherein,the load is cut at the moment of controlling the profit and loss,means spare capacity;
the maximum water abandoning power is the water abandoning power in the peak regulation control period, the maximum water abandoning power base charge is the water abandoning power in the profit-deficit control period, the wind abandoning power is the wind abandoning power in the peak regulation control period, and the light abandoning power is the light abandoning power in the peak regulation control period.
7. The method of claim 1, wherein: in the step 1), other indexes of the electric power are as follows:
(1) if no load shedding is generated and the standby requirement is met, the thermal power requirement Pc,ndComprises the following steps:
otherwise, P is required for thermal powerc,ndComprises the following steps:
wherein,the thermal power is utilized;overhauling the thermal power;the power is insufficient, and the power is insufficient to control load shedding at the time interval;the spare shortage is that if the shutdown standby is arranged to be finished and the spare is still insufficient, the actual rotating standby capacity and the shutdown standby capacity are subtracted from the spare requirement, and if the shutdown standby is arranged to be finished and the spare is remained, the spare shortage is zero;
(2) if one of the power shortage and the spare shortage is negative, the power surplus is obtainedComprises the following steps:
otherwise, surplus electric powerComprises the following steps:
(3) external power supply base chargeFor adjustingDelivering power during a peak control period; peak load of delivered powerComprises the following steps:
wherein,the electric power is delivered during the profit and loss control period;
(4) external electric power base chargeThe method refers to outsourcing electric power in a peak regulation control period; peak load of external powerComprises the following steps:
wherein,the method refers to buying power outside during the profit and loss control period.
8. The method of claim 1, wherein: in the step 2), the demand electric quantity W is determinedsysFor the net electrical demand of the system per year or per month:
Wsys＝Wd+Wa-Ws
wherein, WdThe total electric quantity of the load in the area within a preset statistical time period is calculated; waPurchasing total electric quantity inside and outside a region within a preset statistical time period; wsThe method comprises the steps of (1) distinguishing the total electric quantity sold outside in a preset statistical time period;
the nuclear power generation is the annual or monthly total nuclear power generation capacityNuclear peak loadAnd base chargeRespectively as follows:
wherein,the peak load of all nuclear power generating units in the ith time period;the power generation capacity is the base load power generation capacity of all nuclear power generating units in the ith time period, and N is the hours of the statistical time period;
energy storage balance Wp,balaDescribes the condition of pumping and storing the total power generation and energy every year or every month
Wp,bala＝Wp,gen-Wp,use
Wherein the generated electricity quantity Wp,genThe total power generation of the pump storage unit is within a preset statistical time period; power consumption W of pumped storagep,useThe total energy consumption of the storage unit is within a preset statistical time period.
9. The method of claim 1, wherein: in the step 2), the hydropower can be used as the total hydropower generation amount per year or per month; peak load of water and electricityAnd base chargeRespectively as follows:
wherein,the peak load of all water and electricity in the ith time period;the generated electric quantity is the base charge generated electric quantity of the ith time interval, and N is the number of statistical time intervals;
the peak regulation power generation is the total power generation of the gas turbine every year or every month, and the peak load of the peak regulation unitAnd base chargeRespectively as follows:
wherein,the peak load of all the gas turbine units in the ith time period;generating power for base charge of ith time intervalAnd the electric quantity and N are the number of statistical segments.
10. The method of claim 1, wherein: in the step 2), the thermal power generation is the total thermal power generation amount and the peak load of the thermal power in each year or each monthAnd base chargeRespectively as follows:
wherein,the peak load of all thermal power generating units in the ith time period;the generated electric quantity is the base charge generated electric quantity of the ith time interval, and N is the number of statistical time intervals;
wind-solar energy including wind-electricity energyPhotovoltaic usableWind power generation WwPhotovoltaic power generation WpvWaste wind power Ww,rdLight quantity of sum light and discard Wpv,rd(ii) a Wherein wind power is availablePhotovoltaic usableUnder the condition of no abandoned wind and abandoned light, the wind power generation W is the natural maximum power generation amount of wind power and photovoltaic in a preset statistical time periodwPhotovoltaic power generation WpvThe method comprises the following steps of (1) determining the actual wind power and photovoltaic power generation within a preset statistical time period;
utilization hours: the utilization hours of a certain type of units are the operation hours T when the actual generated energy of all the units of the type is converted into the total rated generated energy:
wherein, WiGenerating capacity of an ith unit of a certain type in a statistical time interval; ciThe unit capacity of the ith unit of a certain type in the statistical time period is obtained, and M is the number of the unit of the ith unit of the certain type in the statistical time period.
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