CN108539731A - A kind of compensation of peak regulation ancillary service cost and Computation for apportionment method - Google Patents
A kind of compensation of peak regulation ancillary service cost and Computation for apportionment method Download PDFInfo
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- CN108539731A CN108539731A CN201810074644.3A CN201810074644A CN108539731A CN 108539731 A CN108539731 A CN 108539731A CN 201810074644 A CN201810074644 A CN 201810074644A CN 108539731 A CN108539731 A CN 108539731A
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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
- H02J3/008—Circuit arrangements for ac mains or ac distribution networks involving trading of energy or energy transmission rights
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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
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
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Abstract
The invention discloses a kind of compensation of peak regulation ancillary service cost and Computation for apportionment method, the compensation of the peak regulation ancillary service cost includes the following steps with Computation for apportionment：Step 1：Calculate the depth peak regulation cost of depth regulating units, the depth peak regulation cost of depth regulating units includes unit efficiency loss cost and opportunity cost, calculates depth regulating units respectively and participates in unit efficiency loss cost and opportunity cost caused by peak regulation ancillary service；Step 2：Calculate regulating units compensation income and non-regulating units overhead cost, respectively measuring and calculating thermoelectricity regulating units compensation income and nuclear power, scene and do not discharge peak regulation obligation the non-regulating units of thermoelectricity overhead cost；The secondary reasonable distribution of cost of implementation income, ensures the economic interests of unit, distributes peak regulation resource rationally, improves the peak modulation capacity of electric system.
Description
Technical Field
The invention relates to the technical field of power economy, in particular to a compensation and allocation calculation method for accounting peak shaving auxiliary service cost.
Background
Safe and reliable power supply is of great significance for maintaining social stability and promoting economic development. Because of the instantaneous balance of the power system, the auxiliary service is an indispensable guarantee for ensuring the safe and stable operation of the power system. Peak shaving is an important component of the auxiliary service of the power system. At present, the peak shaving auxiliary service cost of the power system in China is compensated according to temporary methods for auxiliary service management of grid-connected power plants (article 2006 and article 43). According to the actual operation condition of the power system with different provinces, the compensation is carried out according to the standard of 100-200 yuan/megawatt-hour inequality because the power generated by the depth peak regulation is less than that of the basic peak regulation. However, with the large-scale access of renewable energy sources such as wind power, photovoltaic and the like in China, the power generation capacity of conventional power supplies such as thermal power units and the like is further reduced, and the auxiliary service cost of an electric power system is gradually increased. If the thermal power generating unit with strong peak regulation capacity cannot be reasonably compensated according to the existing peak regulation auxiliary service cost compensation method, the profit is further compressed, the economy of the peak regulation thermal power generating unit is directly influenced, and the fairness dispute of the peak regulation responsibility sharing of the power system is caused.
Therefore, it is desirable to have a method for compensating and allocating peak shaving auxiliary service cost to solve the problems in the prior art.
Disclosure of Invention
The invention aims to provide a compensation and allocation calculation method for peak shaving auxiliary service cost, which is characterized in that on the basis of measuring and calculating the peak shaving auxiliary service cost of a deep peak shaving unit and a start-stop peak shaving unit, the part of cost is compensated and allocated between the peak shaving unit and a non-peak shaving unit, so that secondary reasonable distribution of cost and benefit is realized, the economic benefit of the units is guaranteed, peak shaving resources are optimally configured, and the peak shaving capacity of a power system is improved.
The invention provides a compensation and allocation calculation method for peak regulation auxiliary service cost, which comprises the following steps:
the method comprises the following steps: measuring and calculating the deep peak shaving cost of the deep peak shaving unit, wherein the deep peak shaving cost of the deep peak shaving unit comprises unit efficiency loss cost and opportunity cost, and the unit efficiency loss cost and the opportunity cost caused by the deep peak shaving unit participating in the peak shaving auxiliary service are respectively measured and calculated;
step two: and respectively measuring and calculating the compensation income of the peak shaving unit and the apportionment cost of the non-peak shaving unit, and respectively measuring and calculating the compensation income of the thermal power peak shaving unit and the apportionment cost of the nuclear power unit, the wind and light unit and the thermal power non-peak shaving unit which does not reach the peak shaving obligation.
Preferably, the first step comprises the following steps:
① at the low valley time, the load factor of the deep peak shaving unit is extremely low, at this time, the consumption of the deep peak shaving unit is higher than that under the stable working condition, the generating efficiency of the deep peak shaving unit is reduced, the operation cost is increased, and the unit efficiency loss cost formula for measuring and calculating the deep peak shaving unit is as follows:
C(Pk)＝a×(Pk)2+b×Pk+c (1)
wherein, C (P)k) Is the power generation cost function, P, of the deep peak shaving unit kkIs the output of the deep peak shaving unit k, a, b and c are undetermined parameters of the power generation cost function of the deep peak shaving unit k,is the unit efficiency loss cost of the deep peak shaving unit k,is the depth peak regulation unit k in the depth peak regulation time period delta tiActual average force in, PmIs the installed capacity, lambda, of the deep peak shaving unit k0Is a deep peak shaving load rate reference;
②, calculating the opportunity cost of the depth peak shaving unit, wherein the formula for calculating the opportunity cost of the depth peak shaving unit is as follows:
wherein,is the opportunity cost of the deep peak shaver set k,is the depth peak regulation unit k in the depth peak regulation time period delta tiMean original planned output, peIs the price of the power on the internet,is the depth peak regulation unit k in the depth peak regulation time period delta tiActual average force within;
③ the calculation formula of the depth peak regulation cost of the depth peak regulation unit is as follows:
wherein,is the depth peak shaving cost of the depth peak shaving unit k.
Preferably, the second step comprises the following steps:
①, calculating the compensation gain of the thermal power peak regulation unit, wherein the calculation formula is as follows:
wherein,the compensation gain of the thermal power peak regulation unit k is obtained;
②, calculating the allocation cost of the nuclear power unit, wherein the calculation formula is as follows:
wherein,is the correction power generation amount of a nuclear power unit k,is the actual power generation amount of the nuclear power unit k,is the rated generating capacity of the nuclear power unit k,is the apportionment cost of the nuclear power unit k,is the correction power generation amount of the wind-light unit k,is the corrected generating capacity m of the thermal power generating unit k which does not reach the peak regulation obligationnM is the number of nuclear power units participating in peak shaving cost sharingw-lM is the number of wind-light units participating in peak regulation cost sharingt,1The number m of thermal power generating units participating in peak shaving cost sharingt,2The number of thermal power generating units for obtaining peak shaving cost compensation;
③, calculating the apportionment cost of the wind and light unit, wherein the calculation formula is as follows:
wherein,is the actual power generation amount of the wind-light set k, ξ is the power generation amount correction coefficient of the wind-light set,the apportionment cost of the wind and light unit k is reduced;
④, calculating the apportionment cost of the thermal power generating unit which does not reach peak regulation obligation, wherein the calculation formula is as follows:
the actual power generation amount of the thermal power generating unit which does not reach peak regulation obligation is graded according to different load rate intervals, and the average load rate is higher than lambda0But less than 70% of the electricity isThe average load rate is 70-80% of the electricityThe average load rate is higher than 80% of the electric quantityk1、k2、k3Are respectivelyThe electric quantity correction coefficient of (a) is,the method is the apportionment cost of the thermal power generating unit k which does not reach peak shaving obligation.
Aiming at the problems that the current peak regulation auxiliary service cost cannot be reasonably compensated and the peak regulation auxiliary service capability of the power system is low when renewable energy sources such as wind power, photovoltaic and the like are accessed into the power system in a large scale, the invention discloses a compensation and allocation calculation method for the peak regulation auxiliary service cost.
Drawings
FIG. 1 is a flow chart of compensation and amortization calculations for peak shaver assist service costs.
Figure 2 is a histogram of the share of power apportioning peak shaving auxiliary service costs.
Fig. 3 is a daily load graph of the power system for a certain day.
Fig. 4 is a change bar chart of the generator set under the original peak shaving auxiliary service cost compensation allocation method and the compensation allocation method provided by the invention.
Detailed Description
In order to make the implementation objects, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be described in more detail below with reference to the accompanying drawings in the embodiments of the present invention. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are only some, but not all embodiments of the invention. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The compensation and allocation method of the peak shaving auxiliary service cost is used for measuring and calculating the peak shaving auxiliary service cost of a deep peak shaving unit and a start-stop peak shaving unit, so that the corresponding auxiliary service cost of the peak shaving unit is compensated, meanwhile, the part of cost is allocated among non-peak shaving units, and support is provided for the economic operation of a power system from the aspect of resource optimization configuration.
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
As shown in fig. 1, the peak shaving auxiliary service cost compensation and allocation calculation method includes the following steps:
the method comprises the following steps: measuring and calculating the deep peak shaving cost of the deep peak shaving unit, wherein the deep peak shaving cost of the deep peak shaving unit comprises unit efficiency loss cost and opportunity cost, and the unit efficiency loss cost and the opportunity cost caused by the deep peak shaving unit participating in the peak shaving auxiliary service are respectively measured and calculated;
step two: the thermal power generating unit which undertakes the peak shaving service should obtain the compensation income of the peak shaving auxiliary service; the nuclear power unit, the wind and light unit and the thermal power unit which does not reach peak regulation obligation share peak regulation auxiliary service cost. Respectively measuring and calculating the compensation benefits of thermal power and other peak shaving units and the apportionment cost of nuclear power, wind and light and thermal power and other non-peak shaving units which do not reach peak shaving obligations.
The first step comprises the following steps:
① at the valley period, the load factor of the deep peak shaving unit is extremely low, at this time, the unit consumption is higher than the consumption under the stable working condition, the generating efficiency of the unit is reduced, the operation cost is increased, and the unit efficiency loss cost formula for measuring and calculating the deep peak shaving unit is as follows:
C(Pk)＝a×(Pk)2+b×Pk+c (1)
wherein, C (P)k) Is the generating cost function of the unit k, PkIs the output of the unit k, a, b and c are undetermined parameters of the generating cost function of the unit k,is the unit efficiency loss cost of the deep peak shaving unit k,is the depth peak regulation unit k in the depth peak regulation time period delta tiActual average force in, PmIs the installed capacity, lambda, of the deep peak shaving unit k0Is a deep peak shaving load rate reference;
② the deep peak shaving machine set is to track the peak-valley change of the load, reduce the output of the machine set, and adjust the output of the machine set according to a certain adjusting speed, the deep peak shaving machine set loses the opportunity of part of the capacity participating in the electric power transaction, resulting in the loss of income, namely the opportunity cost.
Wherein,is the opportunity cost of the deep peak shaver set k,is the depth peak regulation unit k in the depth peak regulation time period delta tiMean original planned output, peIs the price of the power on the internet,is the depth peak regulation unit k in the depth peak regulation time period delta tiActual average force within;
③ the calculation formula of the depth peak regulation cost of the depth peak regulation unit is as follows:
wherein,is the depth peak shaving cost of the depth peak shaving unit k.
As shown in fig. 2, the thermal power generating unit that undertakes the peak shaving service in step two should obtain the compensation benefit of the peak shaving auxiliary service; the nuclear power unit, the wind-solar unit and the thermal power unit which does not reach peak regulation obligation share peak regulation auxiliary service cost together, and the second step comprises the following contents:
①, calculating the compensation gain of the thermal power peak regulation unit, wherein the calculation formula is as follows:
wherein,the compensation gain of the thermal power peak regulation unit k is obtained;
②, calculating the allocation cost of the nuclear power unit, wherein the calculation formula is as follows:
wherein,is the correction power generation amount of a nuclear power unit k,is the actual power generation amount of the nuclear power unit k,is the rated generating capacity of the nuclear power unit k,is the apportionment cost of the nuclear power unit k,is the correction power generation amount of the wind-light unit k,is the corrected generating capacity m of the thermal power generating unit k which does not reach the peak regulation obligationnM is the number of nuclear power units participating in peak shaving cost sharingw-lM is the number of wind-light units participating in peak regulation cost sharingt,1The number m of thermal power generating units participating in peak shaving cost sharingt,2The number of thermal power generating units for obtaining peak shaving cost compensation;
③, calculating the apportionment cost of the wind and light unit, wherein the calculation formula is as follows:
wherein,is the actual power generation amount of the wind-light set k, ξ is the power generation amount correction coefficient of the wind-light set,the apportionment cost of the wind and light unit k is reduced;
④, calculating the apportionment cost of the thermal power generating unit which does not reach peak regulation obligation, wherein the calculation formula is as follows:
the actual power generation amount of the thermal power generating unit which does not reach peak regulation obligation is graded according to different load rate intervals, and the average load rate is higher than lambda0But less than 70% of the electricity isThe average load rate is 70-80% of the electricityThe average load rate is higher than 80% of the electric quantityk1、k2、k3Are respectivelyThe electric quantity correction coefficient of (a) is,the method is the apportionment cost of the thermal power generating unit k which does not reach peak shaving obligation.
The invention is further described below with reference to specific embodiments:
the rationality and effectiveness of the invention are illustrated by taking a simple power system comprising 4 thermal power units, 1 nuclear power unit and 2 wind power units as an example. The installed capacities of the thermal power generating unit, the nuclear power generating unit and the wind power generating unit are shown in table 1.
TABLE 1 installed capacity of each unit of the system
As shown in fig. 3, the daily load curve of the power system at a certain day, the average load rate of each generator set, and whether the compensating unit or the sharing unit belongs to the peak shaving auxiliary service cost are shown in table 2.
TABLE 2 Compensation apportionment of average load rate and peak shaving auxiliary service cost for each unit of the system
According to the daily output conditions of the thermal power generating unit 2 and the thermal power generating unit 4, based on the method for measuring and calculating the deep peak shaving cost in the step one, the deep peak shaving cost obtained by the thermal power generating unit 2 is 98.62 ten thousand yuan, the cost compensation of average unit electric quantity is 248 yuan/megawatt hour, the deep peak shaving cost obtained by the thermal power generating unit 4 is 30.48 thousand yuan, and the cost compensation of average unit electric quantity is 220 yuan/megawatt hour.
And based on the method for measuring and calculating the deep peak shaving cost in the step two, the corrected power generation amounts of the thermal power generating unit 1, the thermal power generating unit 3, the nuclear power generating unit 1, the wind power generating unit 1 and the wind power generating unit 2 are measured and calculated, and then the peak shaving auxiliary service cost amortization amount and the cost increase of unit power generation amount of each power generating unit are measured and calculated according to the corrected power generation amount ratio of each power generating unit, as shown in table 3.
TABLE 3 corrected power generation, peak shaving auxiliary service cost amortization and cost increase per power generation for each generator set
As shown in fig. 4, the variation of each generator set under the original peak shaving auxiliary service cost compensation and allocation method and the compensation and allocation method provided by the present invention. According to the comparison result, the compensation and allocation method for the peak shaving auxiliary service cost can more reasonably realize the allocation and sharing of the power system peak shaving auxiliary service authority and the cost in different generator sets.
Finally, it should be pointed out that: the above examples are only for illustrating the technical solutions of the present invention, and are not limited thereto. Although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (3)
1. A method for compensating and allocating peak shaving auxiliary service cost is characterized in that the method for compensating and allocating peak shaving auxiliary service cost comprises the following steps:
the method comprises the following steps: measuring and calculating the deep peak shaving cost of the deep peak shaving unit, wherein the deep peak shaving cost of the deep peak shaving unit comprises unit efficiency loss cost and opportunity cost, and the unit efficiency loss cost and the opportunity cost caused by the deep peak shaving unit participating in the peak shaving auxiliary service are respectively measured and calculated;
step two: and respectively measuring and calculating the compensation income of the peak shaving unit and the apportionment cost of the non-peak shaving unit, and respectively measuring and calculating the compensation income of the thermal power peak shaving unit and the apportionment cost of the nuclear power unit, the wind and light unit and the thermal power non-peak shaving unit which does not reach the peak shaving obligation.
2. The peak shaving assistance service cost compensation and allocation calculation method according to claim 1, wherein: the first step comprises the following steps:
① at the low valley time, the load factor of the deep peak shaving unit is extremely low, at this time, the consumption of the deep peak shaving unit is higher than that under the stable working condition, the generating efficiency of the deep peak shaving unit is reduced, the operation cost is increased, and the unit efficiency loss cost formula for measuring and calculating the deep peak shaving unit is as follows:
C(Pk)＝a×(Pk)2+b×Pk+c (1)
wherein, C (P)k) Is the power generation cost function, P, of the deep peak shaving unit kkIs the output of the deep peak shaving unit k, a, b and c are undetermined parameters of the power generation cost function of the deep peak shaving unit k,is the unit efficiency loss cost, P, of the deep peak shaver unit ki kIs the depth peak regulation unit k in the depth peak regulation time period delta tiActual average force in, PmIs the installed capacity, lambda, of the deep peak shaving unit k0Is a deep peak shaving load rate reference;
②, calculating the opportunity cost of the depth peak shaving unit, wherein the formula for calculating the opportunity cost of the depth peak shaving unit is as follows:
wherein,is the opportunity cost of the deep peak shaver set k,is the depth peak regulation unit k in the depth peak regulation time period delta tiMean original planned output, peIs the price of power on the Internet, Pi kIs the depth peak regulation unit k in the depth peak regulation time period delta tiActual average force within;
③ the calculation formula of the depth peak regulation cost of the depth peak regulation unit is as follows:
wherein,is the depth peak shaving cost of the depth peak shaving unit k.
3. The peak shaving assistance service cost compensation and allocation calculation method according to claim 1, wherein: the second step comprises the following steps:
①, calculating the compensation gain of the thermal power peak regulation unit, wherein the calculation formula is as follows:
wherein,the compensation gain of the thermal power peak regulation unit k is obtained;
②, calculating the allocation cost of the nuclear power unit, wherein the calculation formula is as follows:
wherein,is the correction power generation amount of a nuclear power unit k,is the actual power generation amount of the nuclear power unit k,is the rated generating capacity of the nuclear power unit k,is the apportionment cost of the nuclear power unit k,is the correction power generation amount of the wind-light unit k,is the corrected generating capacity m of the thermal power generating unit k which does not reach the peak regulation obligationnM is the number of nuclear power units participating in peak shaving cost sharingw-lM is the number of wind-light units participating in peak regulation cost sharingt,1The number m of thermal power generating units participating in peak shaving cost sharingt,2The number of thermal power generating units for obtaining peak shaving cost compensation;
③, calculating the apportionment cost of the wind and light unit, wherein the calculation formula is as follows:
wherein,is the actual power generation amount of the wind-light set k, ξ is the power generation amount correction coefficient of the wind-light set,the apportionment cost of the wind and light unit k is reduced;
④, calculating the apportionment cost of the thermal power generating unit which does not reach peak regulation obligation, wherein the calculation formula is as follows:
the actual power generation amount of the thermal power generating unit which does not reach peak regulation obligation is graded according to different load rate intervals, and the average load rate is higher than lambda0But less than 70% of the electricity isThe average load rate is 70-80% of the electricityThe average load rate is higher than 80% of the electric quantityk1、k2、k3Are respectively The electric quantity correction coefficient of (a) is,the method is the apportionment cost of the thermal power generating unit k which does not reach peak shaving obligation.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110021932A (en) * | 2019-04-29 | 2019-07-16 | 西安交通大学 | The peak regulation ancillary service capacity of bilateral participation chooses and economic model construction method |
| CN111382935A (en) * | 2020-03-05 | 2020-07-07 | 海南电网有限责任公司 | Method, device and system for adjusting peak shaving auxiliary service |
| CN111768127A (en) * | 2020-07-21 | 2020-10-13 | 北京清能互联科技有限公司 | Method and system for determining peak shaving auxiliary service cost allocation correction coefficient |
| CN111882146A (en) * | 2020-06-10 | 2020-11-03 | 国家电网公司华北分部 | Expense allocation method and calculation equipment for thermal power unit transformation |
| CN111952996A (en) * | 2020-07-16 | 2020-11-17 | 国网江西省电力有限公司南昌供电分公司 | Energy-storage-containing distributed photovoltaic peak regulation control method based on economic benefit evaluation |
| CN112837179A (en) * | 2021-01-20 | 2021-05-25 | 国网经济技术研究院有限公司 | Method and system for carrying out optimal configuration on thermal power generating unit based on peak shaving cost |
| CN113034209A (en) * | 2021-04-26 | 2021-06-25 | 国网浙江省电力有限公司电力科学研究院 | Method for verifying running cost parameters of generator and calculating running cost compensation |
| CN113283931A (en) * | 2021-05-19 | 2021-08-20 | 广东电力交易中心有限责任公司 | Method and system for improving operation compensation calculation accuracy of power system unit |
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| CN110021932A (en) * | 2019-04-29 | 2019-07-16 | 西安交通大学 | The peak regulation ancillary service capacity of bilateral participation chooses and economic model construction method |
| CN110021932B (en) * | 2019-04-29 | 2021-04-20 | 西安交通大学 | Bilateral participation peak shaving auxiliary service capacity selection and economic model construction method |
| CN111382935A (en) * | 2020-03-05 | 2020-07-07 | 海南电网有限责任公司 | Method, device and system for adjusting peak shaving auxiliary service |
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| CN111882146B (en) * | 2020-06-10 | 2023-12-22 | 国家电网公司华北分部 | Cost allocation method and computing equipment for thermal power unit reconstruction |
| CN111882146A (en) * | 2020-06-10 | 2020-11-03 | 国家电网公司华北分部 | Expense allocation method and calculation equipment for thermal power unit transformation |
| CN111952996B (en) * | 2020-07-16 | 2022-05-06 | 国网江西省电力有限公司南昌供电分公司 | Energy-storage-containing distributed photovoltaic peak regulation control method based on economic benefit evaluation |
| CN111952996A (en) * | 2020-07-16 | 2020-11-17 | 国网江西省电力有限公司南昌供电分公司 | Energy-storage-containing distributed photovoltaic peak regulation control method based on economic benefit evaluation |
| CN111768127A (en) * | 2020-07-21 | 2020-10-13 | 北京清能互联科技有限公司 | Method and system for determining peak shaving auxiliary service cost allocation correction coefficient |
| CN111768127B (en) * | 2020-07-21 | 2024-03-05 | 北京清能互联科技有限公司 | Method and system for determining peak shaving auxiliary service expense allocation correction coefficient |
| CN112837179A (en) * | 2021-01-20 | 2021-05-25 | 国网经济技术研究院有限公司 | Method and system for carrying out optimal configuration on thermal power generating unit based on peak shaving cost |
| CN113034209A (en) * | 2021-04-26 | 2021-06-25 | 国网浙江省电力有限公司电力科学研究院 | Method for verifying running cost parameters of generator and calculating running cost compensation |
| CN113034209B (en) * | 2021-04-26 | 2024-06-14 | 国网浙江省电力有限公司电力科学研究院 | Generator operation cost parameter verification and operation cost compensation calculation method |
| CN113283931A (en) * | 2021-05-19 | 2021-08-20 | 广东电力交易中心有限责任公司 | Method and system for improving operation compensation calculation accuracy of power system unit |
| CN113283931B (en) * | 2021-05-19 | 2023-07-25 | 广东电力交易中心有限责任公司 | Method and system for improving operation compensation calculation accuracy of power system unit |
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