CN112085300B - Power supply classification-based power system total energy storage operation curve calculation method - Google Patents

Power supply classification-based power system total energy storage operation curve calculation method Download PDF

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CN112085300B
CN112085300B CN202011121586.9A CN202011121586A CN112085300B CN 112085300 B CN112085300 B CN 112085300B CN 202011121586 A CN202011121586 A CN 202011121586A CN 112085300 B CN112085300 B CN 112085300B
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章坚民
黄江
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Abstract

The invention discloses a power supply classification-based calculation method for a total energy storage operation curve of a power system. And classifying the power supplies according to types, and then calculating a total energy storage operation curve. The power supply is divided into an energy storage power station, a peak shaving power station and an output determining power station. Firstly, a power plant with determined output bears a total load curve, and the rest curve is used as a load curve to be conditioned; then the peak regulation power station bears the part below the average value of the load curve to be conditioned, so as to form a total energy storage daily operation curve which keeps the charging energy equal to the discharging energy; and distributing the part above the average value of the composite curve to be conditioned to the built energy storage power station, and distributing the rest part to the new energy storage power station, namely planning the position and the capacity of the new energy storage power station according to the rest curve. The method is simple in calculation, fully considers various power stations, comprehensively plans, and effectively saves resources.

Description

Power supply classification-based power system total energy storage operation curve calculation method
Technical Field
The invention belongs to the field of power system planning, and particularly relates to a method for calculating an operation curve of an energy storage power station in a power system according to a power classification result.
Background
With the development of economy, the peak electricity load of the power grid is increased, the peak-valley difference problem is highlighted, and a great challenge is brought to power grid dispatching. In addition, in recent years, renewable energy sources start to be connected in a large scale and become effective substitutes for traditional energy sources, but inherent intermittence and randomness of the renewable energy sources exacerbate the difficulty in power grid allocation. The energy storage battery system is used as a key technology for realizing the space-time transfer of power supply and demand, and has attracted wide attention because the energy storage battery system can realize the functions of peak clipping and valley filling, improving the electric energy quality, absorbing new energy and the like.
Along with the continuous development of energy storage technology, the conditions of commercial operation and the integration of large-scale centralized energy storage power stations into a main network are also gradually matured, and the effect of the energy storage power stations in the main network of the power system is increasingly displayed; in the face of grid connection of large-scale centralized energy storage power stations, the optimized operation of the energy storage power stations in the prior art lacks consideration on the influence of regional comprehensive energy systems, and the type of energy is not included in the optimized consideration range.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a power supply classification-based power system total energy storage operation curve calculation method, which can provide references for planning the address and capacity of an energy storage power station by classifying power supplies and then calculating the total energy storage operation curve.
A power supply classification-based power system total energy storage operation curve calculation method specifically comprises the following steps:
step 1, collecting a total load curve of a system;
selecting the day with the largest power consumption in one year as the representative day, and the total load curve P of the representative day r (t) as a planned chronology curve.
Step 2, classifying power supplies;
the power supply is classified according to whether the daily load with large fluctuation can be born as a standard, and the specific classification method is as follows:
(1) virtually forming a total energy storage power station by all types of energy storage power stations, including commissioned energy storage power stations and energy storage power stations to be planned;
(2) all types of units and power plants which bear peak shaving are virtualized into a total peak shaving power station, and the maximum power of the total peak shaving power station is set as P pcm0 ；
(3) Other power sources are considered to be output determining power plants.
Step 3, calculating the output to determine the system load born by the power plant;
1) Virtual a total photovoltaic power station, and calculating a representative total daily output curve;
2) A total wind power station is virtualized, and a representative total daily output curve is calculated;
3) According to the predicted hydropower station output of the incoming water, a total hydropower station is virtualized, and a representative total output curve is calculated;
4) Calculating a representative daily output curve of the external power according to a plan;
5) Other conventional power plants are fully charged according to the maximum output.
After the prearranged spare capacity is removed, the total load curve of the system is shared according to the representative daily total output curve of the power supply to bear the base load; let the residual load curve after the power supply is born be P ps (t), i.e. the load profile to be conditioned,the average value is as follows:
（1）
wherein T is day Is a time interval.
Step 4, calculating a peak shaving power station load curve;
the total energy storage power station and the total peak shaving power station in the electric power system jointly bear a load curve P to be conditioned ps (t)。
1) If P pcm0 ≥P ps I.e. the maximum power of the total peak shaver power station is larger than the average value of the load curves to be conditioned, the daily operation curve of the peak shaver power station is arranged as follows:
（2）
wherein c 1 For the output coefficient, eta of the peak-shaving power station in the case d 、η c The charging and discharging efficiencies of the total energy storage power station respectively.
At this time, the peak shaving residual capacity of the total peak shaving power station is:
△ peak =P pcm0 -c 1 P ps （3）
the operating curve of the total energy storage power station is:
P esse (t)=P ps (t)-P pc1 (t) （4）
substituting formula (2) into formula (4) yields:
（5）
wherein, when P ps (t)＞P ps The peak regulation power station is in a discharging state, and the rest time is in a charging state; to meet the daily balance of the total stored energy, i.e. the charged energy is equal to the discharged energy, it has to be:
c 1 T c +T d *η d *η c = T c +T d （6）
wherein T is c For the charging time within the day, T d For the discharge time in this day, the deformation of (6) is obtained:
c 1 =1+T d *(1-η d *η c )/ T c （7）
and because of 1-eta d *η c > 0, so c 1 ＞1。
The charging energy A of the total energy storage power station esse (+) and discharge energy A esse (-) is:
（8）
peak shaving residual capacity is:
△ peak =P pcm0 -P ps - P ps * T d *(1-η d *η c )/ T c （9）。
2) If P pcm0 ＜P ps And (3) arranging a daily operation curve of the peak shaving power station as follows when the maximum power of the total peak shaving power station is smaller than the average value of the load curves to be conditioned:
（10）
at this time, the peak shaver power station is completely changed to the basic load operation.
The maximum power of the basic charge set which needs to be increased is as follows:
P pc2，max =P ps -P pcm0 （11）
the daily operating curve for the incremental group of foundation loads is arranged to be:
（12）
wherein c 2 For the output of peak-shaving power stations in this caseCoefficients; analyzing (10) (12), combining the two power stations into a new peak shaving power station, and substituting the new peak shaving power station into the power station (12) to obtain the daily operation mode of the new peak shaving power station:
（13）
the operating curve of the total energy storage power station is:
P esse (t)=P ps (t)-P pc (t) （14）
substituting (13) into (14) to obtain:
（15）
wherein, when P ps (t)＞P ps The peak regulation power station is in a discharging state, and the rest time is in a charging state; to meet the daily balance of the total stored energy, i.e. the charged energy is equal to the discharged energy, it has to be:
T c *(P pcm0 +c 2 (P ps -P pcm0 ))+T d *P ps *η d *η c = (T c +T d )*P ps （16）
i.e.
c 2 =(( T c +T d *(1-η d *η c ))*P ps - T c *P pcm0 )/( T c *(P ps - P pcm0 ))
=((1+ T d *(1-η d *η c )/ T c )- P pcm0 / P ps )/(1- P pcm0 / P ps ) （17）
And because of 1-eta d *η c > 0 and 1+T d *(1-η d *η c )/ T c > 1, so c 2 ＞1。
The increased maximum power of the group of electric loads needs to be satisfied:
P ’ pc2,max =c 2 (P ps -P pxm0 )
=(( 1+ T d *(1-η d *η c )/ T c )- P pcm0 / P ps )*( P ps - P pcm0 )/(1- P pcm0 / P ps ) （18）
the charging energy A of the total energy storage power station esse (+) and discharge energy A esse (-) is:
（19）。
step 5, load sharing of total energy storage power station
1) Arranging the built energy storage power station according to the operation curve of the total energy storage power station calculated in the step 4, and carrying out load sharing according to the limitations of the maximum energy, the maximum output, the minimum charge state and the like;
2) And planning and designing new energy storage power station resources according to the residual operation curve after the established energy storage power stations are allocated.
The invention has the following beneficial effects:
1. the power generation system fully considers the storage of various power generation resources and the power generation resources to be planned in the planning year, calculates the operation curve and distributes the operation curve after classifying the power sources according to the types, and effectively saves the resources;
2. the method is simple, high in operability and convenient to calculate, and can rapidly calculate the typical daily load curve meeting the planning year;
3. the calculation result of the method can be used as a reference basis for a addressing constant volume scheme of a further energy storage power station.
Detailed Description
The invention is further illustrated by the following examples.
Step 1, collecting a total load curve of a system;
total load profile P will represent day r (t) as a planned chronology curve, a total load curve P r (t) the following:
step 2, classifying power supplies;
the power supply is classified according to whether the daily load with large fluctuation can be born as a standard, and the specific classification method is as follows:
(1) virtually forming a total energy storage power station by all types of energy storage power stations, including commissioned energy storage power stations and energy storage power stations to be planned;
(2) all types of units and power plants which bear peak shaving are virtualized into a total peak shaving power station, and the maximum power of the total peak shaving power station is set as P pcm0 ；
(3) Other power sources are considered to be output determining power plants.
Step 3, calculating the output to determine the system load born by the power plant;
1) Virtual a total photovoltaic power station, and calculating a representative total daily output curve;
2) A total wind power station is virtualized, and a representative total daily output curve is calculated;
3) According to the predicted hydropower station output of the incoming water, a total hydropower station is virtualized, and a representative total output curve is calculated;
4) Calculating a representative daily output curve of the external power according to a plan;
5) Other conventional power plants are fully charged according to the maximum output.
After the prearranged spare capacity is removed, the total load curve of the system is shared according to the representative daily total output curve of the power supply to bear the base load; the system load P (t) born by the power plant is calculated and determined as follows:
calculating and determining that the residual load curve after the load bearing of the output power plant is P ps (t), i.e. the load profile to be conditioned, is shown in the following table:
calculating to obtain average value P of load curve to be conditioned ps =68 MW. When P ps (t)＞P ps Indicating that the peak regulating power station is in a discharging state and the rest time is in a charging state, so the charging time of the total energy storage power stationTcTime of discharge =14Td=10。
Step 4, calculating a peak shaving power station load curve;
the total energy storage power station and the total peak shaving power station in the electric power system jointly bear a load curve P to be conditioned ps (t). Wherein the charge and discharge efficiency eta of the total energy storage power station d =η c Time of charge =0.9TcTime of discharge =14Td=10。
1) Maximum power P of peak regulating power station pcm0 =80 MW, i.e. P pcm0 ≥P ps The maximum power of the total peak shaving power station is larger than the average value of the load curve to be conditioned.
In order to meet the daily balance of total energy storage, namely that the charging energy is equal to the discharging energy, the output coefficient of the peak shaving power station, the charging and discharging efficiency and the charging and discharging time of the total energy storage power station are required to meet the following requirements:
c 1 T c +T d *η d *η c = T c +T d
the output coefficient c1= 1.1357 of the peak shaver power station is calculated.
The daily operating curve of the peak shaver power station is arranged as follows:
（20）
according to formula P esse (t)=P ps (t)-P pc1 And (t) calculating an operation curve of the total energy storage power station as shown in the following table:
the load of the energy storage power station is negative, the energy storage power station is in a charging state, and the positive value is in a discharging state.
2) When the maximum power ppm0=60 MW of the peak shaver power station, i.e. ppm0 < Pps, the maximum power of the total peak shaver power station is smaller than the average value of the load curves to be conditioned.
The daily operation curve of the peak shaving power station is calculated as follows:
（21）
the maximum power of the basic charge set that needs to be added is:
P pc2，max =P ps -P pcm0 =8 MW （11）
the daily operating curve for the incremental group of foundation loads is arranged to be:
（22）
wherein c 2 The output coefficient of the peak shaving power station in the situation.
Will beP pc1 AndP pc2 combining the two power stations into a new peak shaving power station, and obtaining the daily operation mode of the new peak shaving power station:
（23）
in order to meet the daily balance of total energy storage, namely that the charging energy is equal to the discharging energy, the output coefficient of the peak shaving power station, the charging and discharging efficiency and the charging and discharging time of the total energy storage power station are required to meet the following requirements:
T c *(P pcm0 +c 2 (P ps -P pcm0 ))+T d *P ps *η d *η c = (T c +T d )*P ps （24）
and calculating to obtain the output coefficient c2= 2.1536 of the peak regulating power station.
According to formula P esse (t)=P ps (t)-P pc And (t) calculating an operation curve of the total energy storage power station as shown in the following table:
the maximum power requirement of the increased basic charge set is satisfied:
P ’ pc2,max =c 2 (P ps -P pxm0 )
=(( 1+ T d *(1-η d *η c )/ T c )- P pcm0 / P ps )*( P ps - P pcm0 )/(1- P pcm0 / P ps )=17.23 MW （25）。

Claims (3)

1. a power supply classification-based power system total energy storage operation curve calculation method is characterized by comprising the following steps of: the method specifically comprises the following steps:
step 1, collecting a total load curve of a system;
selecting the day with the largest power consumption in one year as the representative day, and the total load curve P of the representative day r (t) as a planned chronology curve;
step 2, classifying power supplies;
classifying the power supplies by taking daily loads capable of bearing large fluctuation as a standard, and classifying the power supplies into output determination power plants with maximum power of P com0 The total peak regulation power station and the total energy storage power station to be calculated are as follows:
(1) virtually forming a total energy storage power station by all types of energy storage power stations, including commissioned energy storage power stations and energy storage power stations to be planned;
(2) virtually forming a total peak shaving power station by all types of units and power plants which bear peak shaving;
(3) other power sources are all regarded as output determining power plants;
step 3, calculating the output to determine the system load born by the power plant;
calculating the output to determine the total output curve of the power plant on the representative day and the total load curve of the systemSharing and bearing the base load, and remaining load curve P ps (t) is a load curve to be conditioned, and the average value is:
wherein T is day Is a time interval;
step 4, peak regulation power station load curve calculation
Load profile P to be conditioned ps (t) jointly bearing by the total peak shaving power station and the total energy storage power station, and calculating a daily operation curve of the peak shaving power station and an operation curve of the total energy storage power station according to conditions;
(1) When P pcm0 ≥P ps I.e. the maximum power of the total peak shaving power station is larger than the average value of the load curves to be conditioned, the daily operation curves of the total peak shaving power station and the total energy storage power station are calculated, when P ps (t) is greater than P ps When the peak regulation power station discharges, the peak regulation power station charges the energy storage power station at other moments; according to the daily balance principle of the total energy storage power station, namely that the charging capacity is equal to the discharging energy, calculating the charging energy and the discharging energy of the total energy storage power station and the residual capacity of the peak shaving power station;
(2) When P pcm0 ≥P ps The maximum power of the total peak shaving power station is larger than the average value of the load curves to be conditioned, the base load operation of the peak shaving power station is arranged, and the daily operation curve of the total peak shaving power station is calculated; calculating a daily operation curve of the basic load unit to be added, and combining the daily operation curve with the original peak shaving power station to obtain a new peak shaving power station; calculating the operation curve of the new peak regulating power station, when P ps (t) is greater than P ps When the new peak regulation power station discharges, the new peak regulation power station charges the energy storage power station at other moments; and calculating the charging energy and the discharging energy of the total energy storage power station according to the daily balance principle of the total energy storage power station, namely that the charging capacity is equal to the discharging energy.
2. The method for calculating the total energy storage operation curve of the power system based on power classification as claimed in claim 1, wherein the method comprises the following steps: the method for determining the system load born by the power plant by calculating the output in the step 3 is as follows:
1) Virtual a total photovoltaic power station, and calculating a representative total daily output curve;
2) A total wind power station is virtualized, and a representative total daily output curve is calculated;
3) According to the predicted hydropower station output of the incoming water, a total hydropower station is virtualized, and a representative total output curve is calculated;
4) Calculating a representative daily output curve of the external power according to a plan;
5) Other conventional power plants are fully charged according to the maximum output.
3. The method for calculating the total energy storage operation curve of the power system based on power classification as claimed in claim 1, wherein the method comprises the following steps: the method for calculating the daily operation curve of the peak shaving power station and the operation curve of the total energy storage power station according to the conditions comprises the following steps:
1) If it isI.e. the maximum power of the total peak shaver power station is larger than the average value of the load curves to be conditioned, the daily operation curve of the peak shaver power station is arranged as follows:
wherein c 1 For the output coefficient, eta of the peak-shaving power station in the case d 、η c Respectively the charging and discharging efficiency of the total energy storage power station;
at this time, the peak shaving residual capacity of the total peak shaving power station is:
the operating curve of the total energy storage power station is:
P esse (t)＝P ps (t)-P pc1 (t) (4)
substituting formula (2) into formula (4) yields:
wherein whenThe peak regulation power station is in a discharging state, and the rest time is in a charging state; to meet the daily balance of the total stored energy, i.e. the charged energy is equal to the discharged energy, it has to be:
c 1 T c +T d *η d *η c ＝T c +T d (6)
wherein T is c For the charging time within the day, T d For the discharge time in this day, the deformation of (6) is obtained:
and because of 1-eta d *η c >0, so c 1 >1；
The charging energy A of the total energy storage power station esse (+) and discharge energy A esse (-) is:
peak shaving residual capacity is:
2) If it isI.e. the maximum power of the total peak shaver power station is smaller than the average value of the load curves to be conditioned, the daily operation curve of the peak shaver power station is arranged as follows:
at this time, the peak shaver power station is completely changed into the basic load operation;
the maximum power of the basic charge set which needs to be increased is as follows:
the daily operating curve for the incremental group of foundation loads is arranged to be:
wherein c 2 The output coefficient of the peak shaving power station under the condition is as follows; analyzing (10) (12), combining the two power stations into a new peak shaving power station, and substituting the new peak shaving power station into the power station (12) to obtain the daily operation mode of the new peak shaving power station:
the operating curve of the total energy storage power station is:
P esse (t)＝P ps (t)-P pc (t) (14)
substituting (13) into (14) to obtain:
wherein whenThe peak regulation power station is in a discharging state, and the rest time is in a charging state; to meet the daily balance of the total stored energy, i.e. the charged energy is equal to the discharged energy, it has to be:
i.e.
And because of 1-eta d *η c >0 and 1+T d (1-η d *η c )/T c >1, so c 2 >1；
The increased maximum power of the group of electric loads needs to be satisfied:
the charging energy A of the total energy storage power station esse (+) and discharge energy A esse (-) is:
。
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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109560562A (en) * 2018-12-28 2019-04-02 国网湖南省电力有限公司 Energy-accumulating power station peak regulation control method based on ultra-short term
CN111598295A (en) * 2020-04-13 2020-08-28 中国电建集团贵阳勘测设计研究院有限公司 Power system pumped storage power station installation optimization method for promoting wind power consumption

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109560562A (en) * 2018-12-28 2019-04-02 国网湖南省电力有限公司 Energy-accumulating power station peak regulation control method based on ultra-short term
CN111598295A (en) * 2020-04-13 2020-08-28 中国电建集团贵阳勘测设计研究院有限公司 Power system pumped storage power station installation optimization method for promoting wind power consumption

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