CN105391051B - A kind of intelligent substation efficiency Promotion Transformation amount of energy saving computational methods - Google Patents
A kind of intelligent substation efficiency Promotion Transformation amount of energy saving computational methods Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
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Abstract
The present invention provides a kind of intelligent substation efficiency Promotion Transformation amount of energy saving computational methods, mainly includes：S1) according to intelligent substation efficiency Promotion Transformation information, it is determined that, detection transformer station parameters；S2) computational intelligence substation energy efficiency Promotion Transformation transformer saves quantity of electricity；S3) computational intelligence substation energy efficiency Promotion Transformation saving station power consumption；S4) computational intelligence substation energy efficiency Promotion Transformation increases renewable energy source device newly and produces electricity；S5 quantity of electricity) is saved according to intelligent substation operation conditions computational intelligence substation energy efficiency Promotion Transformation.This method is by saving intelligent substation efficiency Promotion Transformation main electric power equipment quantity of electricity, and quantity of electricity situation is saved in electricity consumption of standing and regenerative resource produces the analysis of electricity, can effectively obtain intelligent substation and save quantity of electricity.
Description
Technical Field
The invention belongs to the field of power systems, and particularly relates to an energy-saving amount calculation method for improving energy efficiency of an intelligent substation.
Background
In the power system, the electric quantity of a power grid is transmitted to users through links such as power transmission, power transformation and power distribution. Substations play a role in the distribution of electrical energy in electrical power systems. The intelligent transformer substation adopts advanced, reliable, integrated and environment-friendly intelligent equipment, takes total station information digitization, communication platform networking and information sharing standardization as basic requirements, automatically completes basic functions of information acquisition, measurement, control, protection, metering, detection and the like, and simultaneously has advanced functions of supporting real-time automatic control, intelligent adjustment, on-line analysis decision, cooperative interaction and the like of a power grid.
Loss reduction and energy saving of the transformer substation are generally carried out from four aspects: planning and construction of a transformer substation, economic operation of a transformer, energy efficiency management of the transformer substation and power demand side management. The transformer substation with excellent structure and advanced equipment is a loss reduction foundation, and the influence on the line loss of the power grid is fully considered in the planning and construction of the transformer substation; the transformer substation is strong, energy-saving and economical, the economic operation and reactive compensation are powerful measures for reducing the loss of the transformer substation, the economic operation does not need investment, the loss reduction effect is good, and the method is an important means for reducing the loss of a power grid; the power demand side management reasonably guides the power demand by means of measures such as policies and electricity prices, and the load of the power grid is averaged as much as possible in time and space.
At present, through the search of documents, a calculation method of a system is not found for improving and transforming the energy efficiency of the intelligent substation.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: according to the method, the energy-saving quantity of the intelligent substation after the energy efficiency improvement and the transformation can be effectively obtained by analyzing the main transformer energy consumption, the station electricity consumption and the new energy access condition of the intelligent substation before and after the energy efficiency improvement.
The technical scheme of the invention is as follows: an energy-saving calculation method for improving energy efficiency of an intelligent substation comprises the following steps:
s1) determining and detecting various parameters of a transformer substation according to energy efficiency improvement and transformation information of the intelligent transformer substation;
s2) calculating the energy efficiency improvement of the intelligent substation to improve the power saving and electric quantity of the transformer;
s3) calculating the electricity consumption quantity of the energy efficiency improvement and reconstruction saving station of the intelligent substation;
s4) calculating the energy efficiency improvement of the intelligent substation to modify the generated electric quantity of newly-added renewable energy equipment;
and S5) calculating energy efficiency improvement of the intelligent substation according to the operation condition of the intelligent substation, and saving electric power and electric quantity.
The method is characterized in that the determined transformer substation parameters in the step S1 comprise transformer no-load power loss, load fluctuation loss coefficient, transformer average load coefficient, transformer rated load power loss, reactive economic equivalent, transformer no-load excitation power and transformer rated load leakage power before and after the energy efficiency of the intelligent transformer substation is improved, the number of front lamp sets, the power of unit lamps before and after the transformation, the number of rear lamp sets and the power of unit lamps after the transformation of the station electric lighting system, the power adjustment coefficient of the lamps before and after the transformation, the running time of lamp equipment, the number of lamp models, the number of lighting calculation areas, the lighting average illumination of the lamps before and after the transformation, the total solar energy irradiation amount on the horizontal plane of the photovoltaic equipment, the installation capacity of photovoltaic components, the irradiance under standard conditions and the comprehensive efficiency coefficient; annual running time T of transformer equipment T On demand ofManual entry, typically 365 by 24=8760 hours total time of year; the time T of a basic period before modification (the basic period refers to a time period before energy-saving measures are implemented for comparing and determining project energy-saving) T1 Manual recording is needed, the statistical period is one year under general conditions, and the total time is 365 × 24=8760 hours;
the method for detecting various parameters of the transformer substation comprises the following steps: the no-load power loss of the transformer before and after transformation is a nameplate parameter and needs manual input; the load fluctuation loss coefficient can be obtained by calculation, the hourly recording electric quantity is required to be provided, the recording electric quantity is obtained by an electric energy meter with more than 2.0 levels, and the load fluctuation loss coefficient is obtained by looking up a table under the condition that the recording electric quantity cannot be obtained;
the average load coefficient of the transformer is the ratio of the average output apparent power of the transformer to the rated capacity of the transformer in a certain time, and the apparent power of the transformer is obtained by an electric energy meter with more than 2.0 levels; the rated load power loss of the transformer is a nameplate parameter; the reactive economic equivalent is obtained by looking up a table;
no-load exciting power Q of transformer 0 Obtained by calculation, Q 0 ＝I 0 ％S N ×10 -2 In which I 0 % is the no-load current percentage, is the parameter of the nameplate of the transformer, S N The rated capacity of the transformer is a parameter of a nameplate of the transformer; rated load leakage power Q of transformer k Obtained by calculation, Q k ＝U k ％S N ×10 -2 Wherein U is k % is the short-circuit voltage percentage of the transformer, which is the name plate parameter of the transformer, S N The rated capacity of the transformer is a nameplate parameter of the transformer; the number of the lamp sets before and after the transformation of the station power lighting system needs to be manually input; the power of the unit lamp before and after the transformation is a rated parameter, and manual input is needed; the power adjustment coefficient of the lamp needs to be manually input; the running time of the lamp equipment before and after the transformation needs to be manually input; the number of the lamp models and the number of the illumination calculation areas, and the average illumination of the lamps before and after the transformation, need to be manually input; the total solar energy irradiation on the horizontal plane of the photovoltaic equipment is obtained by looking up a table; the installation capacity of the photovoltaic module needs to be manually input; under standard conditionsIrradiance is constant 1kWh/m 2 (ii) a The comprehensive efficiency coefficient is a correction coefficient considering the influence of various factors, and includes: 1) photovoltaic module type correction coefficient, 2) inclination angle, azimuth angle correction coefficient of photovoltaic square matrix, 3) photovoltaic power generation system availability ratio, 4) illumination utilization ratio, 5) inverter efficiency, 6) current collection circuit, step-up transformer loss, 7) photovoltaic module surface pollution correction coefficient, 8) photovoltaic module conversion efficiency correction coefficient, the value of comprehensive efficiency coefficient is between 75% -85%, and manual input is required.
In the method, the transformer in step S2 saves electric power, i.e. the annual electric power saving Δ (Δ E) for replacing the distribution transformer, and is calculated according to the following formula:
Δ(ΔE)＝(ΔE-ΔE 1 )×T T (1)
in the formula: delta E is the comprehensive power loss of the transformer before transformation, and Delta E 1 For transforming the overall power loss of the transformer, T T The annual running time of the transformer equipment.
The method comprises the step S3 of improving the energy efficiency of the intelligent substation to save the electric quantity delta A for the substation e The calculation formula of (c) is:
ΔA e ＝A r -A a (2)
in the formula, A r Statistics of the electricity consumption during the reporting period for the lighting project of the lamp, A a Calibrating power consumption for the lamp lighting project;
A r the calculation formula is as follows:
in the formula, Q i Counting the number of i-type lamps in a report period, namely the number of lamps of a certain type before modification; p i The average value of sampled measured power or nominal input power of the i-type lamp in the report period is counted, namely the power of the unit lamp before modification; t is i Calculating the average operation time of the i-type lamps in the report period, namely the operation time of the lamp equipment before modification; i is the model serial number of the lamp before transformation, and is a natural number; n is a modified headlightNumber of models; alpha is alpha i For counting the power adjustment coefficient of the i-type lamp in the report period, i.e. the power adjustment coefficient of the lamp before modification, 0<α i Less than or equal to 1, if no control system alpha is provided i ＝1；
A a The calculation formula is as follows:
in the formula, Q j The number of the j models of lamps in the basic period is the number of the lamps of a certain model after being transformed; p is j The sampled measured power average value or the nominal input power of the j-type lamp in the base period is the power of the transformed unit lamp; t is a unit of j The average operation time of the j-type lamps in the base period is the operation time of the lamps before reconstruction; j is the model of the lamp after transformation; m is the number of the reformed lamp models; alpha (alpha) ("alpha") j In the basic period, the power adjustment coefficient of the model j lamp, namely the power adjustment coefficient of the modified lamp, is 0<α j Less than or equal to 1, if no control system alpha is provided j ＝1；A m Calibrating a power consumption adjustment coefficient for a lamp lighting project, wherein the value of the power consumption adjustment coefficient can be positive or negative;
A m the calculation formula is as follows:
in the formula, E v,rq In the statistical report period, the average illumination of the lamp on the relevant surface, the ground or the operation surface in the q illumination area, namely the average illumination of the lamp before modification; e v,bq In a basic period, the average illumination of the lamp on a relevant surface, the ground or an operation surface in a q illumination area, namely the average illumination of the lamp after modification; q is the number of the illumination area; k is the number of illumination calculation regions.
According to the method, the energy efficiency of the intelligent substation in the step S4 is improved to reform newly-added renewable energy equipment to generate electric quantity, namely, the power generation quantity E of the online power generation P Calculated according to the following formula:
in the formula, H A Is the total solar irradiation in the horizontal plane, P AZ For mounting capacity of the component, E s Irradiance under standard conditions, and K is the overall efficiency coefficient.
The method, the energy efficiency improvement and transformation of the intelligent substation in the step S5, and the electric power and the electric quantity saved delta E TOTAL The calculation method comprises the following steps:
ΔE TOTAL ＝Δ(ΔE)+ΔA e +E P (7)。
in the method, Δ E is calculated according to the following formula:
ΔE＝P 0 +K T β 2 P k +K Q (Q 0 +K T β 2 Q k ) (8)
wherein, P 0 For transformation of no-load power loss of front transformer, K T The load fluctuation loss coefficient before transformation, beta is the average load coefficient of the transformer before transformation, P k For rated load power loss of transformer before transformation, K Q The method is reactive economic equivalent before modification.
Said method, K T Calculated according to the following formula:
in the formula, K f Is a shape factor, T T1 To modify the pre-basal period, A i I is a time sequence number for the recorded electric quantity per hour before transformation;
when A is i When the table cannot be obtained, the specific method for looking up the table comprises the following steps:
obtaining active electric quantity Wp in T hours by an ammeter, and calculating to obtain the average active power P = Wp/T in T hours; obtaining rated capacity S of the transformer according to the parameters of the nameplate of the transformer, and the active load rate gamma of T hours TP = P/S; obtaining Tret from an electric meterCalculating the reactive electric quantity Wq in time to obtain the average reactive power Q = Wq/T in T hours, and then obtaining the average power factor in T hoursObtaining a T-hour load curve by the intelligent ammeter, and obtaining active power P at the maximum active load point m And reactive power Q m The number of hours T when 95% or more of the maximum load appears within T hours is obtained from the load curve m Power factor at maximum loadUsing T hours of active load factor gamma TP Average power factorAnd power factor at maximum loadCalculating the apparent load factor gamma T I.e. the percentage of the average apparent power to the maximum apparent power of the load at T hours:in the formula: gamma ray T The apparent load factor in T hours is in%; according to the number of hours T when more than 95% of the maximum load appears in the T hours m Manually recording, calculating the percentage T of the maximum load operation time m %, which is the percentage of the time during which more than 95% of the maximum load occurs within T hours;in the formula: t is a unit of m % is percent of most loaded run time in units of%; according to gamma T And T m % and obtaining the load fluctuation loss coefficient K according to a table look-up of GB/T13462-2008 T 。
In the method, beta is calculated according to the following formula:
in the formula, S is apparent power averagely output by the transformer before modification, P is active power averagely output by the transformer before modification, and cos phi is an average power factor of a load side of the transformer before modification.
The method, calculating Delta E 1 Replacing the parameters before modification in any one of formulas (5) to (7) with the corresponding parameters after modification to obtain the delta E 1 The value of (c).
The invention has the advantages that: the method is based on main links in the process of upgrading and transforming the energy efficiency of the intelligent substation, and comprises the steps of calculating and deducing the energy saving amount of a power transformer, the electricity saving amount of power transformation station electricity utilization and the electric amount of new energy access generated power, so that the energy saving amount of energy efficiency upgrading and transforming of the intelligent substation is obtained, powerful data support is provided for upgrading and transforming the energy efficiency of the intelligent substation, and theoretical basis and actual guidance are provided for formulating an energy efficiency upgrading and transforming scheme of the intelligent substation.
Drawings
FIG. 1 is a block flow diagram of the present invention.
Detailed Description
The invention relates to an energy-saving amount calculation method for improving energy efficiency of an intelligent substation. The method starts from an intelligent substation energy efficiency improvement and transformation measure, and calculates and deduces the transformed electricity saving amount of a power transformer, the transformed electricity saving amount of station power utilization and the electricity generated by new energy access in the intelligent substation energy efficiency improvement and transformation process to obtain the energy saving amount of the intelligent substation energy efficiency improvement and transformation. The method is novel in theory, compared with the traditional transformer substation energy efficiency improvement and transformation, the new energy is connected into the saved electric power and the saved electric quantity is counted into the saved electric quantity of the transformer substation, the method is more comprehensive in the consideration process of practical problems, and a new thought and a new method are provided for calculation of the saved electric quantity of the intelligent transformer substation energy efficiency improvement and transformation. The method is beneficial to power grid enterprises to accurately master the energy efficiency improvement and transformation electricity-saving condition of the intelligent substation, and can comprehensively predict and acquire the energy efficiency improvement and transformation effect of the intelligent substation.
According to the method, the energy-saving quantity of the energy efficiency improvement and transformation of the intelligent substation is obtained by calculating and deducing the transformation energy-saving quantity of main power equipment (such as a power transformer) in the energy efficiency improvement and transformation process of the intelligent substation, the transformation electricity-saving quantity of station power utilization and the electricity quantity of new energy accessed to generate power. An energy-saving calculation method for improving energy efficiency of an intelligent substation mainly comprises the following steps:
s1) collecting energy efficiency improvement and transformation information of an intelligent substation;
s2) calculating the energy efficiency improvement of the intelligent substation to improve the power saving and electric quantity of the transformer;
s3) calculating the electricity consumption quantity of the energy efficiency improvement and reconstruction saving station of the intelligent substation;
s4) calculating the energy efficiency improvement of the intelligent substation, and transforming newly-added renewable energy equipment (photovoltaic equipment) to generate electric quantity;
and S5) calculating the energy efficiency improvement of the intelligent substation according to the annual operating condition of the intelligent substation, and saving electric power.
The method comprises the following steps that parameters of the step S1 include transformer no-load power loss, load fluctuation coefficient, transformer average load coefficient, transformer rated load power loss, reactive economic equivalent, transformer no-load excitation power, transformer rated load leakage power before and after the energy efficiency of the intelligent substation is improved, the number of transformed front lamps, the power of transformed front lamps, annual working time, the number of transformed rear lamps, the power of transformed rear lamps, power adjustment coefficient of LED lamps, total solar energy irradiation quantity of a photovoltaic device horizontal plane, photovoltaic module installation capacity and comprehensive efficiency coefficient.
In the method, the power saving calculation formula of the transformer in the step S2 is as follows:
Δ(ΔE)＝(ΔE-ΔE 1 )×T T (11)
in the formula: delta (delta E) is annual electricity saving quantity of the replacement distribution transformer and is in kilowatt-hour (kWh), and delta E is comprehensive power loss of the transformer before transformation and isIn kilowatts (kW), Δ E 1 The unit of the comprehensive power loss of the transformer after transformation is kilowatt (kW), and T is the annual running time of the transformer and is the unit of hour (h).
In the method, the calculation formula for improving the energy efficiency of the intelligent substation and transforming the electricity consumption of the energy-saving substation in the step S3 is as follows:
ΔA e ＝A r -A a (12)
in the formula,. DELTA.A e For improving and transforming energy efficiency of intelligent substation, saving station power consumption quantity A r The power consumption in kilowatt-hour (kWh), A, is counted for the period of LED lighting a Power consumption was calibrated for LED lighting items in kilowatt-hours (kWh), Δ A e The LED lighting item node quantity is expressed in kilowatt-hour (kWh).
The power consumption calculation formula in the LED lighting project statistical report period is as follows:
in the formula, Q i For counting the number of i type LEDs and the like in the report period, the unit is cup, P i The average value or the nominal input power of the sampled measured power of the i-type LED lamp in the unit of kilowatt (kW) and T in the report period is counted i Counting the average operation time of i type LED lamps in the report period in hours (h), i is the type of the LED lamps, n is the number of the type of the LED lamps in seeds, and alpha i For the statistical reporting period, the power adjustment coefficient of the i-type LED lamp is 0<α i Less than or equal to 1; if there is no control system alpha i ＝1。
The power consumption for the calibration of the LED lighting project can be calculated according to the formula:
in the formula, Q j Is the number of j type LEDs, etc. in the base period, and the unit is cup, P j The sampled measured power average value or the nominal input power of the model-j LED lamp in the base periodIn units of kilowatts (kW), T j The average operation time of the model j LED lamps in the basic period is in hours (h), j is the illumination model replaced by the LED, m is the number of the illumination model replaced by the LED, the unit is seed, alpha j In the basic period, the power adjustment coefficient of the j model LED lamp is 0<α j Less than or equal to 1; if there is no control system alpha j ＝1，A m The power consumption adjustment factor is calibrated for the LED lighting project, and the value can be positive or negative.
The calculation formula of the power consumption adjustment coefficient for the calibration of the LED lighting item is as follows:
in the formula, E v,rq Is the average illumination of the LED illumination on the relevant surface, ground or working surface in the q illumination area in lux (lx), E v,bq The average illumination of the illumination replaced by the LED on the surface of interest, the ground or the work surface in q illumination areas during the base period is given in lux (lx), q is the illumination area, and k is the number of calculation areas. On the premise that the illuminance and the illumination power density conform to the specifications of GB50034, GB50582, GJJ45 and JGJ/T163, the evaluation-related party can consider A as appropriate m The illumination intensity is reduced after the project is modified, but the illumination intensity and the illumination power density still accord with the related national standard, and the evaluation is approved by related parties, A m And can be ignored.
In the method, the calculation formula of the generated electric quantity of the newly-added renewable energy equipment (photovoltaic equipment) is improved by the energy efficiency of the intelligent substation in the step S4 and is as follows:
in the formula, H A Is the total solar energy irradiation (kW.h/m) on the horizontal plane 2 )，P AZ For component mounting capacity (kWp), E P For power generation on the Internet (kW. H), E s Irradiance under standard conditions (constant =1 kW. H/m) 2 ) K is the coefficient of comprehensive efficiency。
The method comprises the step S5 of calculating the overall saved electric power and electric quantity of the energy efficiency improvement transformation of the intelligent substation
ΔE TOTAL ＝Δ(ΔE T )+ΔE L +E P (17)
In the formula,. DELTA.E TOTAL And electric power and electric quantity are saved for improving and transforming the energy efficiency of the intelligent substation.
The invention is further described in detail below with reference to the figures and examples.
The technical scheme adopted by the invention comprises the following steps:
s1) collecting energy efficiency improvement transformation information of an intelligent substation, wherein the energy efficiency improvement transformation information mainly comprises transformer transformation, station power utilization illumination transformation and new energy access parameters;
s2) calculating the energy efficiency improvement of the intelligent substation to improve the energy saving of the transformer and save the electric power;
s3) calculating the energy efficiency improvement of the intelligent substation to transform the electricity consumption of the saving station;
s4) calculating the electricity generated by improving the energy efficiency of the intelligent substation and reforming newly-added renewable energy equipment;
and S5) calculating the energy efficiency improvement of the intelligent substation according to the annual operation condition of the intelligent substation to improve the overall saved electric power quantity.
1. Collecting energy efficiency improvement transformation information of intelligent substation
1) The statistics of related technical data lays a foundation for energy-saving calculation, and mainly comprises the following information:
the method comprises the steps of transformer no-load power loss, load fluctuation coefficient, transformer average load coefficient, transformer rated load power loss, reactive economic equivalent, transformer no-load excitation power and transformer rated load leakage power before and after the energy efficiency improvement of the intelligent substation.
2) The power utilization lighting system for the station is used for transforming the number of front lamps, transforming the power of a front unit lamp, the annual working time, the number of transformed lamps, transforming the power of a rear unit lamp, the annual working time and the power adjustment coefficient of the LED lamp.
3) Total solar energy irradiation on the horizontal plane of the photovoltaic equipment and comprehensive efficiency coefficient.
2. Computing energy efficiency improvement of intelligent substation, transforming transformer and saving electric power
ΔE＝P 0 +K T β 2 P k +K Q (Q 0 +K T β 2 Q k ) (18)
Wherein, delta E is the comprehensive power loss of the transformer and has unit of kilowatt (kW) and P 0 The unit of the no-load power loss of the transformer is kilowatt (kW) and K T Is the load ripple loss coefficient, beta is the average load coefficient of the transformer, P k The unit is kilowatt (kW) and K for rated load power loss of the transformer Q Is a reactive economic equivalent with the unit of kilowatt per kilo of weak (kW/kvar), Q 0 The unit of the no-load excitation power of the transformer is kilo-depletion (kvar), Q k The unit is kilo-VAR (kvar) for the leakage flux power of the rated load of the transformer.
In the formula, T T1 Is the time of a basal period (a working representative day, a monthly working day or an annual working day) in the unit of hours (h), A i Recorded electricity per hour in kilowatt-hours (kWh);
Δ(ΔE)＝(ΔE-ΔE 1 )×T T (20)
wherein, the unit of delta E is kilowatt hour (kW) and the unit of delta E is kilowatt and delta E for replacing annual electric quantity of the distribution transformer 1 The unit of the comprehensive power loss of the transformed transformer is kilowatt (kW) and T T The annual transformer running time is expressed in hours (h).
Wherein S is the apparent power of the average output of the transformer and has a unit of kilovolt-ampere (kVA), S N The rated capacity of the transformer is expressed in kilovolt-ampere (kVA), and P is transformation voltageThe unit of the active power output by the device is kilowatt (kW), and cos phi is the average power factor of the load side of the transformer.
3. Electricity consumption quantity for calculating energy efficiency improvement transformation of intelligent substation and saving station
ΔA e ＝A r -A a (22)
In the formula,. DELTA.A e For improving and transforming energy efficiency of intelligent substation, saving station power consumption quantity A r The power consumption in kilowatt-hour (kWh), A, is counted for the period of LED lighting a Power consumption was calibrated for LED lighting projects in kilowatt-hours (kWh), Δ A e The LED lighting item node quantity is in kilowatt-hour (kWh).
The power consumption calculation formula in the LED lighting project statistical report period is as follows:
in the formula, Q i To count the number of i type LEDs, etc. in units of cup, P during the report period i The average value or the nominal input power of the sampled measured power of the model i LED lamp in the report period is counted, and the unit is kilowatt (kW) and T i Counting the average operation time of i type LED lamps in the report period in hours (h), i is the type of the LED lamps, n is the number of the type of the LED lamps in seeds, and alpha i For the statistical report period, the power adjustment coefficient of the i model LED lamp is 0<α i Less than or equal to 1; if there is no control system alpha i ＝1。
The power consumption for calibrating the LED lighting project can be calculated according to the formula:
in the formula, Q j Is the number of j type LEDs, etc. in the base period, and the unit is cup, P j The average value or the nominal input power of the sampled measured power of the model j LED lamps in the basic period is kilowatt (kW), T j Is the average operation time of the j type LED lamp in the base periodIs hour (h), j is the illumination model replaced by the LED, m is the number of illumination models replaced by the LED, in species, alpha j In the basic period, the power adjustment coefficient of the j model LED lamp is 0<α j Less than or equal to 1; if there is no control system alpha j ＝1，A m The power consumption adjustment factor is calibrated for the LED lighting project, and the value can be positive or negative.
The calculation formula of the power consumption adjustment coefficient for the calibration of the LED illumination project is as follows:
in the formula, E v,rq Is the average illumination of the LED illumination on the relevant surface, ground or working surface in the q illumination area in lux (lx), E v,bq Is the average illumination of the illumination replaced by the LED on the surface, ground or work surface of interest within the q illumination areas in lux (lx) during the base period, q being the illumination area and k being the number of calculation areas. On the premise that the illuminance and the illumination power density conform to the regulations of GB50034, GB50582, GJJ45 and JGJ/T163, the evaluation-related party can consider A as appropriate m The illumination intensity is reduced after project transformation, but the illumination intensity and the illumination power density still accord with the national relevant standards, and A is approved by evaluation relevant parties m And can be ignored.
4. Calculating energy efficiency improvement of intelligent substation, transforming newly-added renewable energy source equipment (photovoltaic equipment) to generate electric quantity
In the formula, H A Is the total solar energy irradiation (kW.h/m) on the horizontal plane 2 )，P AZ For component mounting capacity (kWp), E P For power generation on the internet (kW.h), E s Is irradiance under standard conditions (constant =1kW · h/m) 2 ) And K is the comprehensive efficiency coefficient. The overall efficiency coefficient K includes: photovoltaic module type correction coefficient, photovoltaic simulation inclination angle and azimuth angle correction coefficient, and photovoltaic power generation systemThe system availability ratio, the illumination utilization ratio, the inverter efficiency, the current collection line loss, the booster transformer loss, the photovoltaic module surface pollution correction coefficient and the photovoltaic module conversion efficiency correction coefficient.
5. Calculating energy efficiency improvement of intelligent substation according to annual operation condition of intelligent substation to improve overall saved electric power and electric quantity
ΔE TOTAL ＝Δ(ΔE T )+ΔE L +E P (27)
In the formula,. DELTA.E TOTAL And electric power and electric quantity are saved for improving and transforming the energy efficiency of the intelligent substation.
Claims (9)
1. An energy-saving calculation method for improving energy efficiency of an intelligent substation comprises the following steps:
s1) determining and detecting various parameters of a transformer substation according to energy efficiency improvement and transformation information of the intelligent transformer substation;
s2) calculating the energy efficiency improvement of the intelligent substation to improve the energy saving of the transformer and save the electric power;
s3) calculating the electricity consumption quantity of the energy efficiency improvement and reconstruction saving station of the intelligent substation;
s4) calculating the energy efficiency improvement of the intelligent substation to modify the generated electric quantity of newly-added renewable energy equipment;
s5) calculating energy efficiency improvement of the intelligent substation according to the operation condition of the intelligent substation to save electric power and electric quantity;
the determined transformer substation parameters in the step S1 comprise transformer no-load power loss, load fluctuation loss coefficient, transformer average load coefficient, transformer rated load power loss, reactive economic equivalent, transformer no-load excitation power and transformer rated load leakage power before and after the energy efficiency of the intelligent transformer substation is improved and transformed, the number of front lamp sets, the power of unit lamps before and after transformation, the number of rear lamp sets and the power of unit lamps after transformation, the power adjustment coefficients of the lamps before and after transformation, the running time of lamp equipment, the number of lamp models and the number of illumination calculation areas, the average illumination of the lamps before and after transformation, the total solar energy irradiation quantity on the horizontal plane of the photovoltaic equipment, the installation capacity of photovoltaic components and the irradiation under standard conditionsDegree, overall efficiency coefficient; annual running time T of transformer equipment T Manual input is required; pre-base time of reconstruction T T1 Manual input is needed;
the method for detecting various parameters of the transformer substation comprises the following steps: the no-load power loss of the transformer before and after transformation is a nameplate parameter and needs manual input; the load fluctuation loss coefficient can be obtained by calculation, the hourly recording electric quantity is required to be provided, the recording electric quantity is obtained by an electric energy meter with more than 2.0 levels, and the load fluctuation loss coefficient is obtained by looking up a table under the condition that the recording electric quantity cannot be obtained; the average load coefficient of the transformer is the ratio of the average output apparent power of the transformer to the rated capacity of the transformer in a certain time, and the apparent power of the transformer is obtained by an electric energy meter with more than 2.0 levels; the rated load power loss of the transformer is a nameplate parameter; the reactive economic equivalent is obtained by table look-up;
no-load exciting power Q of transformer 0 Obtained by calculation, Q 0 ＝I 0 ％S N ×10 -2 In which I 0 % is the percentage of the no-load current, which is the parameter of the nameplate of the transformer, S N The rated capacity of the transformer is a parameter of a nameplate of the transformer; rated load leakage power Q of transformer k Obtained by calculation, Q k ＝U k ％S N ×10 -2 Wherein U is k % is the short-circuit voltage percentage of the transformer, which is the name plate parameter of the transformer, S N The rated capacity of the transformer is a parameter of a nameplate of the transformer; the number of the lamp sets before and after the transformation of the station power lighting system needs to be manually input; the power of the unit lamp before and after transformation is rated parameter, and needs to be manually input; the power adjustment coefficient of the lamp needs to be manually input; the running time of the lamp equipment needs to be manually input before and after the transformation; the number of the lamp models and the number of the illumination calculation areas, and the average illumination of the lamps before and after the transformation, need to be manually input; the total solar energy irradiation on the horizontal plane of the photovoltaic equipment is obtained by looking up a table; the installation capacity of the photovoltaic module needs to be manually input; irradiance under standard conditions was constant 1kWh/m 2 (ii) a The comprehensive efficiency coefficient is a correction coefficient in consideration of the influence of various factors, and includes: 1) Photovoltaic module type correction factor, 2) inclination angle of photovoltaic array,The azimuth correction coefficient, 3) the availability ratio of a photovoltaic power generation system, 4) the illumination utilization ratio, 5) the inverter efficiency, 6) the loss of a current collection circuit and a booster transformer, 7) the surface pollution correction coefficient of a photovoltaic module, 8) the conversion efficiency correction coefficient of the photovoltaic module, and the value of the comprehensive efficiency coefficient is 75-85%, and the comprehensive efficiency coefficient needs manual input.
2. The method of claim 1, wherein: the transformer in the step S2 saves electric power, that is, the annual electric power saving amount Δ (Δ E) of the distribution transformer is changed, and is calculated according to the following formula:
Δ(ΔE)＝(ΔE-ΔE 1 )×T T (1)
in the formula: delta E is the comprehensive power loss of the transformer before transformation, and Delta E 1 For the purpose of improving the comprehensive power loss, T, of the transformer T The annual running time of the transformer equipment.
3. The method of claim 2, wherein: step S3, energy efficiency improvement and transformation of intelligent substation and electricity consumption delta A of conservation station e The calculation formula of (c) is:
ΔA e ＝A r -A a (2)
in the formula, A r Statistics of the electricity consumption during the reporting period for the lighting project of the lamp, A a Calibrating power consumption for the light item;
A r the calculation formula is as follows:
in the formula, Q i Counting the number of i-type lamps in a report period, namely the number of lamps of a certain type before modification; p i The average value of sampled measured power or nominal input power of the i-type lamp in the report period is counted, namely the power of the unit lamp before modification; t is a unit of i Calculating the average operation time of the i-type lamps in the report period, namely the operation time of the lamp equipment before modification; i is the model serial number of the lamp before transformation, and is a natural number; n is the number of the models of the reformed front lamps; alpha (alpha) ("alpha") i For counting the power adjustment coefficient of the i-type lamp in the report period, i.e. the power adjustment coefficient of the lamp before modification, 0<α i Less than or equal to 1, if the control system alpha is not available i ＝1；
A a The calculation formula is as follows:
in the formula, Q j The number of the j models of lamps in the basic period is the number of the lamps of a certain model after being transformed; p j The average value of sampled measured power or nominal input power of the j-type lamp in the base period is the unit lamp power after transformation; t is j The average operation time of the j-type lamps in the base period is the operation time of the lamps before the reconstruction; j is the model of the lamp after transformation; m is the number of the reformed lamp models; alpha is alpha j In the basic period, the power adjustment coefficient of the model j lamp, namely the power adjustment coefficient of the modified lamp, is 0<α j Less than or equal to 1, if no control system alpha is provided j ＝1；A m Calibrating a power consumption adjustment coefficient for a lamp lighting project, wherein the value of the power consumption adjustment coefficient can be positive or negative;
A m the calculation formula is as follows:
in the formula, E v,rq In the statistical report period, the average illumination of the lamp on the relevant surface, the ground or the operation surface in the q illumination area, namely the average illumination of the lamp before modification; e v,bq In a basic period, the average illumination of the lamp on a relevant surface, the ground or a working surface in a q illumination area, namely the average illumination of the lamp after transformation; q is the number of the illumination area; k is the number of illumination calculation regions.
4. The method of claim 3, wherein: s4, improving the energy efficiency of the intelligent substation, transforming newly-added renewable energy equipment to generate electric quantity, namely, power generation quantity E of online P Calculated according to the following formula:
in the formula, H A Is the total solar irradiation in the horizontal plane, P AZ For mounting capacity of the component, E s Irradiance under standard conditions, and K is the overall efficiency coefficient.
5. The method of claim 4, wherein: step S5, energy efficiency improvement transformation of intelligent substation saves electric power quantity delta E TOTAL The calculation method comprises the following steps:
ΔE TOTAL ＝Δ(ΔE)+ΔA e +E P (7)。
6. the method of claim 2, wherein Δ E is calculated as:
ΔE＝P 0 +K T β 2 P k +K Q (Q 0 +K T β 2 Q k ) (8)
wherein, P 0 For no-load power loss of transformer before transformation, K T The load fluctuation loss coefficient before transformation, beta is the average load coefficient of the transformer before transformation, P k For rated load power loss of transformer before transformation, K Q The method is reactive economic equivalent before modification.
7. The method of claim 6, wherein K is T Calculated according to the following formula:
in the formula, K f Is a form factor, T T1 To modify the pre-basal period, A i I is a time sequence number for the recorded electric quantity per hour before transformation;
when A is i Concrete method for looking up table when it can't be obtainedThe method comprises the following steps:
obtaining active electric quantity Wp within T hours by an ammeter, and calculating to obtain the average active power P = Wp/T within T hours; obtaining rated capacity S of the transformer according to the nameplate parameters of the transformer, and obtaining the active load rate gamma in T hours TP = P/S; obtaining reactive power Wq within T hours by an ammeter, calculating to obtain average reactive power Q = Wq/T within T hours, and then obtaining the average power factor within T hoursObtaining a T-hour load curve by the intelligent ammeter, and obtaining the active power P at the maximum active load point m And reactive power Q m The number of hours T when 95% or more of the maximum load appears within T hours is obtained from the load curve m Power factor at maximum loadUsing T hours of active load factor gamma TP Average power factorAnd power factor at maximum loadCalculating the apparent load factor gamma T I.e. the percentage of the average apparent power to the maximum apparent power of the load at T hours:in the formula: gamma ray T The apparent load factor in T hours is in%; according to the number of hours T when more than 95% of the maximum load appears in the T hours m Manually recording, calculating the percentage T of the maximum load operation time m %, which is the percentage of the time during which more than 95% of the maximum load occurs within T hours;in the formula: t is m % of maximum load operationPercent between, in units; according to gamma T And T m % and obtaining the load fluctuation loss coefficient K according to a table look-up of GB/T13462-2008 T 。
8. The method of claim 7, wherein β is calculated according to the following equation:
in the formula, S is the apparent power averagely output by the transformer before modification, P is the active power averagely output by the transformer before modification, and cos phi is the average power factor of the load side of the transformer before modification.
9. The method according to any one of claims 6 to 8, wherein: calculating Delta E 1 Replacing the parameters before modification in any one of formulas (8) to (10) with the corresponding parameters after modification to obtain the delta E 1 The value of (c).
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