CN113988897A - Wind storage system output deviation punishment cost calculation method and device - Google Patents
Wind storage system output deviation punishment cost calculation method and device Download PDFInfo
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Abstract
The invention provides a method and a device for calculating the punishment cost of wind storage system output deviation, wherein the method comprises the following steps: acquiring a wind speed measured data sequence of the wind turbine generator; calculating the predicted output according to the output power function or the output characteristic curve of the wind turbine; calculating the corrected output of the wind-storage combined power generation system according to the climbing limit; calculating theoretical charge and discharge power of the energy storage device; calculating the actual charge and discharge power of the energy storage device; and calculating the output deviation penalty cost of the wind storage system. On the premise of guaranteeing safe operation of a power grid, the economic benefit of the wind-storage combined power generation system is evaluated on the basis of considering the slope climbing rate limit of the wind-storage combined power generation system.
Description
Technical Field
The invention relates to the technical field of power markets, in particular to a method and a device for calculating the punishment cost of wind storage system output deviation.
Background
The large-scale grid connection of new energy has become a necessary trend. Because new energy such as wind power has intermittence and volatility, the wind power output becomes smooth by configuring an energy storage system, the system regulation pressure is relieved, and the safety factor is improved.
The existing related research contents comprise an improvement effect of energy storage on the wind power quality, a control strategy of smooth wind power output of an energy storage system, a profit evaluation model of a wind-storage combined power generation system (hereinafter referred to as a wind-storage system) and a capacity ratio optimization method. However, the above studies fail to consider the influence of the hill climbing rate limitation on the economic operation evaluation of the combined system, and generally, the wind power calculated according to the wind speed is directly adopted, or a mode of tracking the planned output is adopted.
The climbing event is as follows: when a strong low-pressure system (or cyclone), low-altitude torrent, thunderstorm, gust or similar long-term extreme meteorological events occur, the power of the wind power plant is suddenly increased within a period of time, and an uphill event occurs; when a relative meteorological event occurs or the wind speed of the fan is higher than the cut-out wind speed, part of the fans continuously quit the operation, the power of the wind power plant suddenly drops within a period of time, and a climbing event occurs. After a climbing event occurs in the system, the active power is seriously unbalanced in a short time, so that the frequency is out of limit, and even accidents such as load shedding or large-area power failure are caused. According to different regions and application scenes, different definitions and control standards are provided for the wind power climbing event. However, the wind power grid-connected guiding rules of all countries list climbing rate limits. For example, the power change in the United states and Canada within 1min is required to be less than 10 percent of rated power; danish requires that the power change is less than 5% of rated power within 1 min; south Africa requires power changes of less than 50MW within 1min, etc.
Disclosure of Invention
The invention aims to provide a method and a device for calculating the punishment cost of the output deviation of a wind storage system, which can solve the problem in the prior art caused by not considering the climbing rate limitation of a wind storage combined power generation system.
The purpose of the invention is realized by the following technical scheme:
in a first aspect, the invention provides a wind storage system output deviation penalty cost calculation method, which comprises the following steps:
acquiring a wind speed actual measurement data sequence v (t) of the wind turbine generator;
calculating the predicted output e (t) according to the output power function or the output characteristic curve of the wind turbine;
calculating the corrected output e' (t) of the wind-storage combined power generation system according to the climbing limit;
calculating theoretical charging and discharging power R (t) of the energy storage device;
calculating the actual charge and discharge power R' (t) of the energy storage device;
and calculating the output deviation penalty cost F (t) of the wind storage system.
Further, the calculation formula for calculating the predicted output e (t) according to the wind turbine generator output power function is as follows:
wherein v isciIndicating cut-in wind speed, vcoIndicating cut-out wind speed, vrIndicating rated wind speed, PrIndicating the rated power.
Further, the calculation formula of the corrected output e' (t) is as follows:
and lim represents the limit of the system on the output climbing rate of the wind turbine generator, namely, the absolute value of the output change of the fan cannot exceed lim when the t time period is compared with the last time period t-1.
Further, the theoretical charge-discharge power r (t) is calculated by the formula: r (t) ═ e (t) — e' (t).
Further, the calculation formula of the actual charge and discharge power R' (t) is:
R′(t)＝S(t)-S(t-1)，
wherein S (t) represents the charge and discharge power in the period of t, and S (t-1) represents the charge and discharge power in the period of t-1.
Further, the formula of s (t) is:
in the formula, cmaxAnd cminRespectively representing the upper limit and the lower limit of the capacity of the energy storage device; delta+And Δ-Respectively, an upper charge rate limit and an upper discharge rate limit of the energy storage device.
Further, the wind storage system output deviation penalty cost f (t) is calculated according to the formula:
in the formula, x+(t)、x-And (t) respectively representing the unit price of raising cost and the unit price of lowering cost of the wind storage system output deviation.
Further, each data of the wind speed measured data sequence v (t) is an average wind speed in a fixed time interval.
In a second aspect, the invention provides a wind storage system output deviation penalty cost calculation device, which comprises a wind speed measurement unit, a first calculation unit, a second calculation unit, a third calculation unit, a fourth calculation unit, a fifth calculation unit and a sixth calculation unit, wherein:
the wind speed measuring unit is used for measuring the real-time wind speed of the wind turbine generator;
the first calculation unit is used for calculating the average wind speed in a fixed time interval and forming a wind speed measured data sequence;
the second calculating unit is used for calculating the predicted output;
the third calculating unit is used for calculating the corrected output of the wind storage system;
the fourth calculating unit is used for calculating the theoretical charging and discharging power of the energy storage device;
the fifth calculating unit is used for calculating the actual charging and discharging power of the energy storage device;
and the sixth calculating unit is used for calculating the wind storage system output deviation penalty cost.
Further, the second calculating unit comprises a first calculating module and a second calculating module, wherein the first calculating module is used for calculating the predicted output according to the wind turbine output power function, and the second calculating unit is used for calculating the predicted output according to the wind turbine output characteristic curve.
According to the wind storage system output deviation punishment cost calculation method and device, the economic benefit of the wind storage combined power generation system is evaluated on the basis of considering the climbing rate limit of the wind storage combined power generation system on the premise of ensuring the safe operation of a power grid.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings described below are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
FIG. 1 is a flow chart of a storage system output deviation penalty cost calculation method of the present invention;
FIG. 2 is a graph of the wind turbine output characteristic of the present invention.
Detailed Description
The embodiments of the present disclosure are described in detail below with reference to the accompanying drawings.
The embodiments of the present disclosure are described below with specific examples, and other advantages and effects of the present disclosure will be readily apparent to those skilled in the art from the disclosure in the specification. It is to be understood that the described embodiments are merely illustrative of some, and not restrictive, of the embodiments of the disclosure. The disclosure may be embodied or carried out in various other specific embodiments, and various modifications and changes may be made in the details within the description without departing from the spirit of the disclosure. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed herein without making any creative effort, shall fall within the protection scope of the present disclosure.
The invention discloses a method for calculating the punishment cost of wind storage system output deviation, which comprises the following steps:
and step S1, acquiring a wind speed actual measurement data sequence v (t) of the wind turbine generator.
Each datum of the sequence is the average wind speed over a fixed time interval, such as 1 hour.
And step S2, calculating the predicted output e (t) according to the wind turbine output power function or the wind turbine output characteristic curve.
Further, the calculation formula for calculating the predicted output e (t) according to the wind turbine generator output power function is as follows:
(1) in the formula, vciIndicating cut-in wind speed, vcoIndicating cut-out wind speed, vrIndicating rated wind speed, PrIndicating the rated power.
Further, the output characteristic curve of the wind turbine is shown in fig. 2.
And step S3, calculating the corrected output e' (t) of the wind-storage combined power generation system according to the climbing limit.
And lim represents the limit of the system on the output climbing rate of the wind turbine generator. Compared with the last time period t-1, the absolute value of the output change of the fan cannot exceed lim in the time period t. lim and the initial condition e' (0) need to be set manually.
And step S4, calculating theoretical charging and discharging power R (t) of the energy storage device.
R (t) ═ e (t) — e' (t) represents the theoretical charge/discharge power of the energy storage device.
When the predicted output e (t) is larger than the limit output e' (t), the redundant power needs to be stored in the energy storage device (charging), and R (t) is larger than 0; when the predicted output e (t) is smaller than the limit output e' (t), the power shortage needs to be supplemented (discharged) by the energy storage device, and R (t) is less than 0; when the two are equal, it means that the energy storage device does not need to be charged or discharged, and r (t) is 0.
The actual charging and discharging power of the energy storage device requires additional consideration of some limitations.
And step S5, calculating the actual charging and discharging power R' (t) of the energy storage device.
Wherein S (t) represents the charge and discharge power in the period of t, S (t-1) represents the charge and discharge power in the period of t-1, and cmaxAnd cminThe upper limit and the lower limit of the capacity of the energy storage device are respectively set; delta+And Δ-Respectively, the upper limit of the charging rate and the upper limit of the discharging rate of the energy storage device. The initial condition S (0) needs to be set manually.
Accordingly, the actual charge/discharge power R' (t) ═ S (t) — S (t-1) of the energy storage device is calculated.
And step S6, calculating the wind storage system output deviation penalty cost F (t).
In the formula, x+(t)、x-And (t) respectively representing the unit price of raising cost and the unit price of lowering cost of the wind storage system output deviation. Under the market trading environment of the novel power system, the market price in the corresponding time period can be taken.
It can be seen that the cost is related to the wind speed v (t), the output characteristics of the fan, the ramp rate limit lim of the fan, the initial output e' (0) of the wind storage system, and the upper and lower capacity limits c of the energy storage devicemaxAnd cminInitial state S (0) of energy storage device, upward and downward expense x of wind storage system output deviation+(t)、x-(t) and the like.
The wind storage system output deviation penalty charge calculation device comprises a wind speed measurement unit, a first calculation unit, a second calculation unit, a third calculation unit, a fourth calculation unit, a fifth calculation unit and a sixth calculation unit, wherein:
and the wind speed measuring unit is used for measuring the real-time wind speed of the wind turbine generator.
And the first calculating unit is used for calculating the average wind speed in a fixed time interval and forming a wind speed measured data sequence.
And the second calculating unit is used for calculating the predicted output.
Further, the second calculating unit comprises a first calculating module and a second calculating module, wherein the first calculating module is used for calculating the predicted output according to the wind turbine generator output power function, and the second calculating unit is used for calculating the predicted output according to the wind turbine generator output characteristic curve.
And the third calculating unit is used for calculating the corrected output of the wind storage system.
And the fourth calculating unit is used for calculating the theoretical charging and discharging power of the energy storage device.
And the fifth calculating unit is used for calculating the actual charging and discharging power of the energy storage device.
And the sixth calculating unit is used for calculating the wind storage system output deviation penalty cost.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application may be substantially implemented or contributed to by the prior art, or all or part of the technical solution may be embodied in a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a read-only memory (ROM), a Random Access Memory (RAM), a magnetic or optical disk, and other various media capable of storing program codes.
The above description is for the purpose of illustrating embodiments of the present invention and is not intended to limit the present invention, and it will be understood by those skilled in the art that any modification, equivalent replacement, or improvement made without departing from the spirit and principle of the present invention shall fall within the protection scope of the present invention.
Claims (10)
1. The wind storage system output deviation penalty cost calculation method is characterized by comprising the following steps:
acquiring a wind speed actual measurement data sequence v (t) of the wind turbine generator;
calculating the predicted output e (t) according to the output power function or the output characteristic curve of the wind turbine;
calculating the corrected output e' (t) of the wind-storage combined power generation system according to the climbing limit;
calculating theoretical charging and discharging power R (t) of the energy storage device;
calculating the actual charge and discharge power R' (t) of the energy storage device;
and calculating the output deviation penalty cost F (t) of the wind storage system.
2. The method for calculating the wind storage system output deviation penalty cost according to claim 1, wherein the calculation formula for calculating the predicted output e (t) according to the wind turbine generator output power function is as follows:
wherein v isciIndicating cut-in wind speed, vcoIndicating cut-out wind speed, vrIndicating rated wind speed, PrIndicating the rated power.
3. The wind storage system output deviation penalty cost calculation method according to claim 2, wherein the calculation formula of the corrected output e' (t) is as follows:
and lim represents the limit of the system on the output climbing rate of the wind turbine generator, namely, the absolute value of the output change of the fan cannot exceed lim when the t time period is compared with the last time period t-1.
4. The wind power system output deviation penalty cost calculation method according to claim 3, wherein the calculation formula of the theoretical charging and discharging power R (t) is as follows: r (t) ═ e (t) — e' (t).
5. The wind storage system output deviation penalty cost calculation method according to claim 1, wherein the calculation formula of the actual charge-discharge power R' (t) is as follows:
R′(t)＝S(t)-S(t-1)，
wherein S (t) represents the charge and discharge power in the period of t, and S (t-1) represents the charge and discharge power in the period of t-1.
6. The wind storage system output deviation penalty cost calculation method according to claim 5, wherein the calculation formula of S (t) is as follows:
in the formula, cmaxAnd cminRespectively representing the upper limit and the lower limit of the capacity of the energy storage device; delta+And Δ-Respectively, an upper charge rate limit and an upper discharge rate limit of the energy storage device.
7. The wind storage system output deviation penalty cost calculation method according to claim 1, wherein the wind storage system output deviation penalty cost F (t) is calculated by the formula:
in the formula, x+(t)、x-And (t) respectively representing the unit price of raising cost and the unit price of lowering cost of the wind storage system output deviation.
8. The wind storage system output deviation penalty cost calculation method according to claim 1, wherein each data of the wind speed measured data sequence v (t) is an average wind speed in a fixed time interval.
9. Wind stores up system output deviation penalty expense computational device, its characterized in that includes wind speed measurement unit, first computational element, second computational element, third computational element, fourth computational element, fifth computational element and sixth computational element, wherein:
the wind speed measuring unit is used for measuring the real-time wind speed of the wind turbine generator;
the first calculation unit is used for calculating the average wind speed in a fixed time interval and forming a wind speed measured data sequence;
the second calculating unit is used for calculating the predicted output;
the third calculating unit is used for calculating the corrected output of the wind storage system;
the fourth calculating unit is used for calculating the theoretical charging and discharging power of the energy storage device;
the fifth calculating unit is used for calculating the actual charging and discharging power of the energy storage device;
and the sixth calculating unit is used for calculating the wind storage system output deviation penalty cost.
10. The wind storage system output deviation penalty cost calculation device according to claim 9, wherein the second calculation unit comprises a first calculation module and a second calculation module, wherein the first calculation module is used for calculating according to the wind turbine generator output power function
And the second calculation unit is used for calculating the predicted output according to the output characteristic curve of the wind turbine generator.
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