CN113422373A - Method for analyzing influence of electrochemical energy storage power station participating in frequency modulation auxiliary service market on CPS1 index - Google Patents

Method for analyzing influence of electrochemical energy storage power station participating in frequency modulation auxiliary service market on CPS1 index Download PDF

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CN113422373A
CN113422373A CN202110605964.9A CN202110605964A CN113422373A CN 113422373 A CN113422373 A CN 113422373A CN 202110605964 A CN202110605964 A CN 202110605964A CN 113422373 A CN113422373 A CN 113422373A
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cps1
energy storage
frequency modulation
power station
index
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CN113422373B (en
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熊嘉丽
陈金玉
唐志军
陈�峰
宋少群
张伟骏
李智诚
惠东
黄霆
张昀昉
郭威
翁桂萍
郑陈达
牛萌
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China Electric Power Research Institute Co Ltd CEPRI
Electric Power Research Institute of State Grid Fujian Electric Power Co Ltd
State Grid Fujian Electric Power Co Ltd
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China Electric Power Research Institute Co Ltd CEPRI
Electric Power Research Institute of State Grid Fujian Electric Power Co Ltd
State Grid Fujian Electric Power Co Ltd
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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
    • H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
    • H02J3/241—The oscillation concerning frequency
    • 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
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
    • H02J3/466—Scheduling the operation of the generators, e.g. connecting or disconnecting generators to meet a given demand
    • 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
    • H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
    • H02J2203/10—Power transmission or distribution systems management focussing at grid-level, e.g. load flow analysis, node profile computation, meshed network optimisation, active network management or spinning reserve management
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E70/00—Other energy conversion or management systems reducing GHG emissions
    • Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin

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Abstract

The invention provides an analysis method for influence of an electrochemical energy storage power station participating in frequency modulation auxiliary service market on CPS1 indexes, which is based on a CPS1 evaluation standard in a TBC control mode and an assessment method of a power grid, and takes ten minutes as an evaluation interval to compare CPS1 index average values under the two conditions that the electrochemical energy storage power station participates in frequency modulation and does not participate in frequency modulation, calculate the influence degree of the electrochemical energy storage power station participating in frequency modulation auxiliary service market on CPS1 indexes by using the CF average value in the evaluation interval, and further analyze the action condition of the electrochemical energy storage power station on CPS1 indexes. The analysis method provided by the invention is mainly used for calculating the CF value in the CPS1 index, and can also take the influence of the electrochemical energy storage power station participating in the frequency modulation auxiliary service market on the power deviation of the connecting line and the frequency deviation of the system into consideration.

Description

Method for analyzing influence of electrochemical energy storage power station participating in frequency modulation auxiliary service market on CPS1 index
Technical Field
The invention relates to the technical field of electrochemical energy storage power stations, in particular to an analysis method for the influence of an electrochemical energy storage power station participating in a frequency modulation auxiliary service market on CPS1 indexes, which is applied to the analysis of the influence of the electrochemical energy storage power station participating in the frequency modulation auxiliary service market on CPS1 indexes.
Background
In order to realize 'carbon peak reaching and carbon neutralization', the construction of a novel power system mainly based on new energy is accelerated, and in recent years, new energy with wind power and photovoltaic as cores enters a leap-type development stage. The intermittent and fluctuating output of the large-scale new energy source connected to the power grid provides sufficient green power, and simultaneously, new challenges are brought to the power system. Among them, the more outstanding problem is that the risk of system frequency and tie line power fluctuation is increased, and participation in AGC [ Automatic Generation Control (AGC) ] is increased to the greatest extent: as an important means for adjusting the frequency of the power system and controlling the power deviation of the tie line, three Control modes are divided into a fixed frequency Control CFC, a fixed exchange power Control CNIC and a tie line deviation Control TBC, and the Control deviation (ACE) of the output Control Area of the generator set is adjusted to be continuously reduced to zero. According to the AGC control mode, the ACE control target is different. Among them, the most commonly used is the tie line deviation control mode (TBC), and the area control deviation ACE in this control mode is generated by the combined action of the tie line power deviation and the system frequency deviation, and the ACE in the invention is particularly referred to as "ACE in TBC control mode". The frequency modulation pressure of the generator and the requirements of the power grid on the performance of the frequency modulation unit are higher and higher.
Generally, the power grid frequency modulation task is mainly undertaken by the conventional units (thermal power, hydroelectric power and the like), and in terms of physical characteristics, the conventional generator is mechanical equipment with rotary inertia, power adjustment is realized by controlling the opening degree of a turbine valve/turbine guide vane, the frequency modulation capability of the conventional generator is not matched with power and frequency fluctuation caused by the output characteristic of new energy, and the power grid faces the problem of scarcity of flexible frequency modulation resources in the future. For conventional units such as these thermoelectricity, water and electricity, current electrochemistry energy storage is as the comparatively ripe novel power of technique, is to exert oneself through power electronics device on-off control, possesses power bidirectional regulation, response speed fast, the high characteristic of regulation precision, accords with novel electric power system to frequency modulation resource performance demand.
The generator set with the frequency modulation capability participates in frequency modulation through the AGC system, namely the AGC system generates power control targets (AGC commands for short) of each generator set according to the ACE, each generator changes output according to the AGC commands, system frequency stability is maintained, the fact that the power of a tie line can track a planned output curve in real time is guaranteed, and the frequency modulation service provided by the generator set is called.
However, most of the existing power grid contribution degree evaluation mechanisms aim at conventional units, cannot reasonably quantify the contribution of energy storage participating in frequency modulation service for electrochemical energy storage, and are not matched with the actual contribution degree of the frequency modulation effect of the conventional units on the power grid, so that the fair balance among market main bodies is damaged to a certain extent.
Most of the existing interconnected power networks at home and abroad adopt a Control Performance Standard (CPS) to evaluate and standardize AGC Control behaviors of each Control area. The I-type control performance index (CPS1) is used for measuring the relation between the area control error ACE and the system frequency deviation and can reflect the control effect of the area AGC.
Disclosure of Invention
Aiming at the defects and shortcomings in the prior art, the invention provides an analysis method for the influence of an electrochemical energy storage power station participating in frequency modulation auxiliary service market on a CPS1 index, and the influence of the energy storage power station participating in the frequency modulation market on the CPS1 index is analyzed by considering a calculation formula of a CPS1 index in combination with a region for measuring the contribution degree of the energy storage power station to a power grid. Based on a CPS1 evaluation standard in a TBC control mode and a related assessment method of a power grid, CPS1 indexes of an electrochemical energy storage power station under the two conditions of participating in frequency modulation and not participating in frequency modulation are compared, and the action condition of the electrochemical energy storage power station on the CPS1 indexes is analyzed by calculating the influence degree of the electrochemical energy storage power station participating in frequency modulation auxiliary service market on the CPS1 indexes. The analysis method provided by the invention mainly calculates the CPS1 index, can give consideration to the influence of the electrochemical energy storage power station participating in the frequency modulation auxiliary service market on the power deviation of the connecting line and the system frequency deviation, and combines the evaluation method of the power grid on the CPS1 index for analysis, can more comprehensively evaluate the influence of the electrochemical energy storage power station participating in the frequency modulation auxiliary service market on the interconnected power grid and the regional evaluation index, and has reference value for making the relevant policy and mechanism of the electrochemical energy storage power station participating in the frequency modulation market.
The invention specifically adopts the following technical scheme:
an analysis method for influence of electrochemical energy storage power stations participating in frequency modulation auxiliary service markets on CPS1 indexes is characterized by comprising the following steps: based on a CPS1 evaluation standard in a TBC control mode and an assessment method of a power grid, ten minutes are taken as an evaluation interval, CPS1 index average values under the two conditions that an electrochemical energy storage power station participates in frequency modulation and does not participate in frequency modulation are compared, and the influence degree of the electrochemical energy storage power station participating in frequency modulation auxiliary service market on the CPS1 index is calculated by using the CF average values in the evaluation interval.
The method for analyzing the influence of the electrochemical energy storage power station participating in the frequency modulation auxiliary service market on the CPS1 index is characterized by comprising the following steps of:
step S1: calculating the average frequency deviation Delta F of the system per minute according to the second-level data of the system frequency and the power of the tie lineAVE-minAverage value of power deviation per minute Δ P of the sum-and-tie lineAVE-min：
Figure BDA0003092700170000031
Figure BDA0003092700170000032
Wherein f ist-secFor the actual frequency of the system per second, fs-secFor rated frequency of the system, fs-sec＝50Hz；Pt-secFor the actual power of the tie line per second, Ps-secPlanning values for tie line power;
step S2: control deviation ACE per minute in TBC control modeAVE-minComprises the following steps:
ACEAVE-min＝ΔPAVE-min-10B·ΔFAVE-min (3)
wherein B is a frequency deviation coefficient set by the control area, the unit is MW/0.1Hz, and the negative sign is provided;
step S3: the actual CPS1 indexes of the connecting line per minute of the control area are as follows:
Figure BDA0003092700170000033
CPS1＝(2-CF)×100％ (5)
wherein epsilon1The control target value of the interconnected power grid to the root mean square of the frequency deviation of one minute all year round;
step S4: assuming that the electrochemical energy storage power station does not participate in frequency modulation, the average value of the tie line power deviation per minute of the control area is delta PNo energy storage-min：
Figure BDA0003092700170000034
The i and the j are respectively the moment of energy storage frequency modulation in one minute time period and the moment of not participating in frequency modulation, the precision is in the second level, and n is the number of seconds of the energy storage power station participating in frequency modulation in the one minute time period; delta PLi-secFor power deviation of the i-time link, Δ PLj-secIs the power deviation, Δ P, of the tie at time jCi-secThe frequency modulation power of the energy storage power station at the moment i;
step S5: substituting the formula (6) into the formulas (3) to (5) to obtain the CPS1 per minute when the energy storage power station does not participate in frequency modulationWithout energy storageIndexes are as follows:
Figure BDA0003092700170000035
CPS1without energy storage＝(2-CFWithout energy storage)×100％ (8)；
Step S6: ten minutes is taken as an examination interval, in the examination interval, when the electrochemical energy storage power station participates in frequency modulation, the CPS1 is the relevant index per minuteiAnd CFiAverage value of CPS110And CF10(ii) a When not participating in frequency modulation, the related index per minute is CPS1i-no energy storageAnd CFi-no energy storageAverage value of CPS110-no energy storageAnd CF10-no energy storage：
Figure BDA0003092700170000041
Figure BDA0003092700170000042
Further, CPS1 is analyzed according to the calculation result and the power grid assessment standard10And CPS110-no energy storageFour cases in two intervals of 200% or more and less than 200%, respectively:
(1)CPS110not less than 200% CPS110-no energy storageAt more than or equal to 200%, CF10Less than or equal to 0 and CF10-no energy storageThe control area is not more than 0, and the control area is not examined no matter whether the energy storage power station participates in frequency modulation or not, so that the frequency modulation function of the energy storage power station has no influence on CPS1 indexes;
(2)CPS110not less than 200% CPS110-no energy storageAt < 200%, CF10Less than or equal to 0 and CF10-no energy storageThe CPS1 of the assessment interval can be determined by the frequency modulation function of the energy storage power station when the frequency is more than 010The index is increased to more than 200%, and the part exceeding 200% can not be subjected to any examination and reward, so that the influence degree of the frequency modulation effect of the energy storage power station on the CPS1 index is (2-CPS1)10-no energy storage) I.e. CF10-no energy storage；
(3)CPS110< 200% and CPS110-no energy storageAt < 200%, CF10> 0 and CF10-no energy storage> 0, if CPS110Greater than CPS110-no energy storageThe control area is examined under the frequency modulation effect of the energy storage power station, but the examination and collection cost is reduced, and the CPS1 index is still facilitated; in this case, CPS1 is used10-CPS110-no energy storage(i.e. CF)10-no energy storage-CF10) The method is defined as the influence degree of the frequency modulation effect of the energy storage power station on the CPS1 index;
(4)CPS110< 200% and CPS110-no energy storageAt more than or equal to 200%, CF10> 0 and CF10-no energy storageLess than or equal to 0, the energy storage power station participates in frequency modulation and is not beneficial to the improvement of CPS1 indexes, and the action range is CPS110-no energy storageDown to CPS110(ii) a The 200% is used as a boundary, the action range of the energy storage power station on the CPS1 index is divided into two parts, namely CPS110-no energy storageThe part exceeding 200 percent does not check the charging cost and has no influence on the CPS1 index; CPS110Less than 200% of the fraction will generate a check-up charge, which has a negative effect on the CPS1 indicator, thus CPS1 is added10-2 (i.e., -CF)10) The method is defined as the influence degree of the frequency modulation effect of the energy storage power station on the CPS1 index, and is a negative value.
Further, taking ten minutes as an evaluation interval, calculating the influence degree delta Y of the electrochemical energy storage power station participating in the frequency modulation auxiliary service market on the CPS1 index by using the CF index: if delta Y is larger than 0, the electrochemical energy storage power station frequency modulation effect is shown to improve the CPS1 index; if Δ Y is less than 0, it indicates that its frequency modulation effect is not favorable for CPS1 index, and if Δ Y is equal to 0, it indicates that its frequency modulation effect has no influence on CPS1 index, that is:
Figure BDA0003092700170000051
the invention and the optimized scheme thereof are based on a CPS1 evaluation standard in a TBC control mode and an assessment method of a power grid, ten minutes is taken as an evaluation interval, CPS1 index average values under the two conditions that an electrochemical energy storage power station participates in frequency modulation and does not participate in frequency modulation are compared, the CF average value in the evaluation interval is used for calculating the influence degree of the electrochemical energy storage power station participating in frequency modulation auxiliary service market on CPS1 indexes, and then the action condition of the electrochemical energy storage power station on CPS1 indexes is analyzed.
The analysis method provided by the invention mainly calculates the CF value in the CPS1 index, can give consideration to the influence of the electrochemical energy storage power station participating in the frequency modulation auxiliary service market on the power deviation of a connecting line and the system frequency deviation, and combines the evaluation method of a power grid on the CPS1 index for analysis, so that the influence of the electrochemical energy storage power station participating in the frequency modulation auxiliary service market on the interconnected power grid and the regional evaluation index is more comprehensively evaluated, and the important reference value is provided for formulating the relevant policies and mechanisms of the electrochemical energy storage power station participating in the frequency modulation market.
Detailed Description
In order to make the features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail as follows:
1. CPS1 assessment method
According to a conventional assessment method of the power and the electricity of the connecting line, 10 minutes are taken as an assessment interval, and when the average value of CPS1 in the assessment interval is greater than or equal to 200%, the assessment result is not charged.
If the average value of CPS1 in the assessment interval is less than 200% but greater than or equal to 100%, the absolute value of the average value of ACE every ten minutes is required to be controlled within a specified range L10If the control range is exceeded, the exceeding part is multiplied by a (2-CPS1) proportional coefficient to be used as electric quantity to check and charge; if the average value of CPS1 in the assessment interval is less than 100%, the absolute value of the average value of ACE every ten minutes does not exceed L10Is multiplied by a (1-CPS1) scaling factor as a part of the charge to be charged, while the absolute value of the average value per ten minutes of ACE exceeds L10The part (2) is multiplied by a proportionality coefficient of (2-CPS1) to check and charge, the closer the CPS1 average value in the check interval is to 200%, the better the AGC control effect is, and the less charge is relative to check and charge.
2. According to the assessment method, the embodiment provides an analysis method for the influence of the energy storage power station participating in frequency modulation on CPS1 indexes
(1) Calculating the average frequency deviation Delta F of the system per minute according to the second-level data of the system frequency and the power of the tie lineAVE-minAverage value of power deviation per minute Δ P of the sum-and-tie lineAVE-min：
Figure BDA0003092700170000061
Figure BDA0003092700170000062
Wherein f ist-secFor the actual frequency of the system per second, fs-secFor rated frequency of the system, fs-sec＝50Hz；Pt-secFor the actual power of the tie line per second, Ps-secPlanning values for the tie line power.
(2) Control deviation ACE per minute in TBC control modeAVE-minComprises the following steps:
ACEAVE-min＝ΔPAVE-min-10B·ΔFAVE-min (3)
wherein B is the frequency deviation coefficient set by the control area, the unit is MW/0.1Hz, and the negative sign is provided.
(3) The actual CPS1 indexes of the connecting line per minute of the control area are as follows:
Figure BDA0003092700170000063
CPS1＝(2-CF)×100％ (5)
wherein epsilon1The control target value of the interconnected network to the root mean square of the annual one-minute frequency deviation is obtained.
(4) Assuming that the electrochemical energy storage power station is not involved in the frequency modulation, the average value Δ P of the tie-line power deviation per minute of the control regionNo energy storage-min：
Figure BDA0003092700170000064
The i and the j are respectively the moment of energy storage frequency modulation in one minute time period and the moment of not participating in frequency modulation, the precision is in the second level, and n is the number of seconds of the energy storage power station participating in frequency modulation in the one minute time period; delta PLi-secFor power deviation of the i-time link, Δ PLj-secIs the power deviation, Δ P, of the tie at time jCi-secAnd the frequency modulation power of the energy storage power station at the moment i.
(5) Substituting formula (6) into formulas (3) - (5)) CPS1 per minute can be obtained when the energy storage power station does not participate in frequency modulationWithout energy storageIndexes are as follows:
Figure BDA0003092700170000065
CPS1without energy storage＝(2-CFWithout energy storage)×100％ (8)
(6) Ten minutes is taken as an examination interval, in the examination interval, when the electrochemical energy storage power station participates in frequency modulation, the CPS1 is the relevant index per minuteiAnd CFiAverage value of CPS110And CF10(ii) a When not participating in frequency modulation, the related index per minute is CPS1i-no energy storageAnd CFi-no energy storageAverage value of CPS110-no energy storageAnd CF10-no energy storage：
Figure BDA0003092700170000071
Figure BDA0003092700170000072
3. Judgment condition for influence of energy storage power station participating in frequency modulation on CPS1 index
Analyzing CPS1 according to the calculation result and the power grid assessment standard10And CPS110-no energy storageFour cases in two intervals of 200% or more and less than 200%, respectively:
(1)CPS110not less than 200% CPS110-no energy storageAt more than or equal to 200%, CF10Less than or equal to 0 and CF10-no energy storageThe control area is not more than 0, and the control area is not examined no matter the energy storage power station participates in frequency modulation, so that the frequency modulation function of the energy storage power station has no influence on CPS1 indexes.
(2)CPS110Not less than 200% CPS110-no energy storageAt < 200%, CF10Less than or equal to 0 and CF10-no energy storageGreater than 0, frequency modulation function energy of energy storage power stationCPS1 capable of checking the assessment interval10The index is increased to more than 200%, and the part exceeding 200% can not be subjected to any examination and reward, so that the influence degree of the frequency modulation effect of the energy storage power station on the CPS1 index is (2-CPS1)10-no energy storage) I.e. CF10-no energy storage。
(3)CPS110< 200% and CPS110-no energy storageAt < 200%, CF10> 0 and CF10-no energy storage> 0, if CPS110Greater than CPS110-no energy storageThe method shows that under the frequency modulation effect of the energy storage power station, although the control area is examined, the examination and collection cost is reduced, and the CPS1 index is still beneficial. In this case, CPS1 is used10-CPS110-no energy storage(i.e. CF)10-no energy storage-CF10) The influence degree of the frequency modulation effect of the energy storage power station on the CPS1 index is defined.
(4)CPS110< 200% and CPS110-no energy storageAt more than or equal to 200%, CF10> 0 and CF10-no energy storageLess than or equal to 0, the energy storage power station participates in frequency modulation and is not beneficial to the improvement of CPS1 indexes, and the action range is CPS110-no energy storageDown to CPS110. The 200% is used as a boundary, the action range of the energy storage power station on the CPS1 index is divided into two parts, namely CPS110-no energy storageThe part exceeding 200 percent does not check the charging cost and has no influence on the CPS1 index; CPS110Less than 200% of the fraction will generate a check-up charge, which has a negative effect on the CPS1 indicator, thus CPS1 is added10-2 (i.e., -CF)10) The method is defined as the influence degree of the frequency modulation effect of the energy storage power station on the CPS1 index, and is a negative value.
Based on the calculation and analysis, ten minutes is taken as an evaluation interval, and the CF index is used for calculating the influence degree delta Y of the electrochemical energy storage power station participating in the frequency modulation auxiliary service market on the CPS1 index. If delta Y is larger than 0, the electrochemical energy storage power station frequency modulation effect is shown to improve the CPS1 index; if Δ Y is less than 0, it indicates that its frequency modulation effect is not favorable for CPS1 index, and if Δ Y is equal to 0, it indicates that its frequency modulation effect has no influence on CPS1 index, that is:
Figure BDA0003092700170000081
the present invention is not limited to the above-mentioned preferred embodiments, and any other analysis method for analyzing the influence of the electrochemical energy storage power station participating in the fm auxiliary service market on the CPS1 index can be obtained by anyone based on the teaching of the present invention.

Claims (4)

1. An analysis method for influence of electrochemical energy storage power stations participating in frequency modulation auxiliary service markets on CPS1 indexes is characterized by comprising the following steps: based on a CPS1 evaluation standard in a TBC control mode and an assessment method of a power grid, ten minutes are taken as an evaluation interval, CPS1 index average values under the two conditions that an electrochemical energy storage power station participates in frequency modulation and does not participate in frequency modulation are compared, and the influence degree of the electrochemical energy storage power station participating in frequency modulation auxiliary service market on the CPS1 index is calculated by using the CF average values in the evaluation interval.
2. An analysis method for influence of an electrochemical energy storage power station participating in frequency modulation auxiliary service market on CPS1 indexes is characterized by comprising the following steps:
step S1: calculating the average frequency deviation Delta F of the system per minute according to the second-level data of the system frequency and the power of the tie lineAVE-minAverage value of power deviation per minute Δ P of the sum-and-tie lineAVE-min：
Figure FDA0003092700160000011
Figure FDA0003092700160000012
Wherein f ist-secFor the actual frequency of the system per second, fs-secFor rated frequency of the system, fs-sec＝50Hz；Pt-secIs the reality of the tie line per secondInter power, Ps-secPlanning values for tie line power;
step S2: control deviation ACE per minute in TBC control modeAVE-minComprises the following steps:
ACEAVE-min＝ΔPAVE-min-10B·ΔFAVE-min (3)
wherein B is a frequency deviation coefficient set by the control area, the unit is MW/0.1Hz, and the negative sign is provided;
step S3: the actual CPS1 indexes of the connecting line per minute of the control area are as follows:
Figure FDA0003092700160000013
CPS1＝(2-CF)×100％ (5)
wherein epsilon1The control target value of the interconnected power grid to the root mean square of the frequency deviation of one minute all year round;
step S4: assuming that the electrochemical energy storage power station does not participate in frequency modulation, the average value of the tie line power deviation per minute of the control area is delta PNo energy storage-min：
Figure FDA0003092700160000014
The i and the j are respectively the moment of energy storage frequency modulation in one minute time period and the moment of not participating in frequency modulation, the precision is in the second level, and n is the number of seconds of the energy storage power station participating in frequency modulation in the one minute time period; delta PLi-secFor power deviation of the i-time link, Δ PLj-secIs the power deviation, Δ P, of the tie at time jCi-secThe frequency modulation power of the energy storage power station at the moment i;
step S5: substituting the formula (6) into the formulas (3) to (5) to obtain the CPS1 per minute when the energy storage power station does not participate in frequency modulationWithout energy storageIndexes are as follows:
Figure FDA0003092700160000021
CPS1without energy storage＝(2-CFWithout energy storage)×100％ (8)；
Step S6: ten minutes is taken as an examination interval, in the examination interval, when the electrochemical energy storage power station participates in frequency modulation, the CPS1 is the relevant index per minuteiAnd CFiAverage value of CPS110And CF10(ii) a When not participating in frequency modulation, the related index per minute is CPS1i-no energy storageAnd CFi-no energy storageAverage value of CPS110-no energy storageAnd CF10-no energy storage：
Figure FDA0003092700160000022
Figure FDA0003092700160000023
3. The method for analyzing the influence of the electrochemical energy storage power station participating in the frequency modulation auxiliary service market on the CPS1 indexes is characterized in that:
analyzing CPS1 according to the calculation result and the power grid assessment standard10And CPS110-no energy storageFour cases in two intervals of 200% or more and less than 200%, respectively:
(1)CPS110not less than 200% CPS110-no energy storageAt more than or equal to 200%, CF10Less than or equal to 0 and CF10-no energy storageThe control area is not more than 0, and the control area is not examined no matter whether the energy storage power station participates in frequency modulation or not, so that the frequency modulation function of the energy storage power station has no influence on CPS1 indexes;
(2)CPS110not less than 200% CPS110-no energy storageAt < 200%, CF10Less than or equal to 0 and CF10-no energy storageThe CPS of the assessment interval can be determined by the frequency modulation function of the energy storage power station when the frequency is more than 0110The index is increased to more than 200%, and the part exceeding 200% can not be subjected to any examination and reward, so that the influence degree of the frequency modulation effect of the energy storage power station on the CPS1 index is (2-CPS1)10-no energy storage) I.e. CF10-no energy storage；
(3)CPS110< 200% and CPS110-no energy storageAt < 200%, CF10> 0 and CF10-no energy storage> 0, if CPS110Greater than CPS110-no energy storageThe control area is examined under the frequency modulation effect of the energy storage power station, but the examination and collection cost is reduced, and the CPS1 index is still facilitated; in this case, CPS1 is used10-CPS110-no energy storage(i.e. CF)10-no energy storage-CF10) The method is defined as the influence degree of the frequency modulation effect of the energy storage power station on the CPS1 index;
(4)CPS110< 200% and CPS110-no energy storageAt more than or equal to 200%, CF10> 0 and CF10-no energy storageLess than or equal to 0, the energy storage power station participates in frequency modulation and is not beneficial to the improvement of CPS1 indexes, and the action range is CPS110-no energy storageDown to CPS110(ii) a The 200% is used as a boundary, the action range of the energy storage power station on the CPS1 index is divided into two parts, namely CPS110-no energy storageThe part exceeding 200 percent does not check the charging cost and has no influence on the CPS1 index; CPS110Less than 200% of the fraction will generate a check-up charge, which has a negative effect on the CPS1 indicator, thus CPS1 is added10-2 (i.e., -CF)10) The method is defined as the influence degree of the frequency modulation effect of the energy storage power station on the CPS1 index, and is a negative value.
4. The method for analyzing the influence of the electrochemical energy storage power station participating in the frequency modulation auxiliary service market on the CPS1 indexes is characterized in that:
and taking ten minutes as an evaluation interval, calculating the influence degree delta Y of the electrochemical energy storage power station participating in the frequency modulation auxiliary service market on the CPS1 index by using the CF index: if delta Y is larger than 0, the electrochemical energy storage power station frequency modulation effect is shown to improve the CPS1 index; if Δ Y is less than 0, it indicates that its frequency modulation effect is not favorable for CPS1 index, and if Δ Y is equal to 0, it indicates that its frequency modulation effect has no influence on CPS1 index, that is:
Figure FDA0003092700160000031
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