CN103277250B - The appraisal procedure of wind-powered electricity generation amount is abandoned in large-scale wind electricity base based on mark post unit - Google Patents

Abstract

The invention discloses the appraisal procedure that wind-powered electricity generation amount is abandoned in a kind of large-scale wind electricity base based on mark post unit, comprise the following steps: the average output coefficient calculating wind energy turbine set every 5 minutes all mark post units, calculate this wind energy turbine set real-time start capacity of every 5 minutes, calculate this wind energy turbine set theory of every 5 minutes to exert oneself, calculate every 5 minutes abandon wind-powered electricity generation amount, draw and abandon wind-powered electricity generation amount in whole wind energy turbine set certain hour section, by calculate each wind energy turbine set in wind power base abandon that wind-powered electricity generation measures whole wind power base abandon wind-powered electricity generation amount.Realize simple to operate, cost is low and can accurately carry out abandoning the advantage that wind-powered electricity generation gauge calculates.

Description

Evaluation method of abandoned wind power in large-scale wind power bases based on benchmarking units

technical field

The invention relates to the field of wind power generation, in particular to a method for evaluating the amount of abandoned wind power of a large-scale wind power base based on a benchmark unit.

Background technique

The curtailed wind power of wind farms refers to the power that can be generated by wind farms but cannot be generated due to factors such as grid transmission channels and safe operation needs.

Abandoning wind is a common phenomenon in the process of large-scale development of wind power, which is very similar to abandoning water in the process of hydropower generation. Large-scale wind power bases cover a wide area and generally include multiple wind farms or groups of wind farms. Due to the transmission limit of the grid transmission channel, real-time load balance and other factors, a certain degree of wind curtailment will result. A correct and scientific understanding of abandoned wind power and a reasonable calculation of abandoned wind power will contribute to the healthy and stable development of large-scale wind power, improve the level of power grid dispatching and operation, promote the coordinated development of wind power planning and power grid planning, and improve the quality of clean energy. utilization rate.

At present, my country's wind power industry has not yet formed a standard for the evaluation algorithm of abandoned wind power. The existing method is generally to calculate the difference between the output of the wind farm and the installed capacity, and then integrate it to obtain the abandoned wind power. However, for 10-million-kilowatt-scale wind power bases, the actual output simultaneous rate of each wind farm is generally low, so calculations using this method will generally result in inaccurate calculations of curtailed wind power. Another method is to measure the actual wind energy resources through the wind measuring tower, and compare the theoretical output of the computer group under the condition of no wind curtailment with the actual power generation, so as to realize the estimation of the curtailed wind power, but the premise of this method is It means that all wind farms in the wind power base have corresponding wind measuring towers, but when the wind farm does not have corresponding wind measuring towers, this method will fail, especially for 10 million-kilowatt wind power bases, it is difficult to provide each Wind farms are equipped with corresponding wind measuring towers. The cost of this method is relatively high, and the operation is relatively complicated.

Contents of the invention

The object of the present invention is to address the above problems and propose a method for evaluating the amount of abandoned wind power in large-scale wind power bases based on benchmark units, so as to achieve the advantages of simple operation, low cost and accurate calculation of the amount of abandoned wind power.

In order to achieve the above object, the technical scheme adopted in the present invention is:

A method for evaluating the abandoned wind power of large-scale wind power bases based on benchmark units, including the following steps:

Step 1: Obtain the operating status of all units in the wind farm and the real-time output of each unit through the real-time information of the wind turbines uploaded by the wind farm every 5 minutes, and calculate the average output coefficient of all benchmark units in the wind farm every 5 minutes. The formula is as follows:

in, is the actual output of the i-th benchmark unit, is the stand-alone capacity of the i-th benchmark unit, and samp represents the set of benchmark units;

Step 2: Calculate the real-time start-up capacity of the wind farm every 5 minutes, the formula is as follows:

in, is the stand-alone capacity of the i-th unit, and start represents the set of starting units;

Step 3: Calculate the theoretical output of the wind farm every 5 minutes, the formula is as follows:

;

Step 4: Obtain the real-time output value R of the wind farm every 5 minutes through EMS (Energy Management System). When the theoretical output value T is greater than the actual output value R, it is considered that there is abandoned wind, so the abandoned wind power every 5 minutes is expressed as:

;

Step 5: The curtailed wind power of the entire wind farm within a certain period of time is expressed as:

The unit capacity of a wind farm is in MW, and the unit of abandoned wind power is MWh;

Step 6: Obtain the abandoned wind power of the entire wind power base by calculating the abandoned wind power of each wind farm in the wind power base.

According to a preferred embodiment of the present invention, when the output of the wind farm is limited, the benchmark unit of the wind farm maintains a normal power generation state; The average curtailment power during the period is used to calculate the curtailed wind power of the wind farm.

The technical solution of the present invention has the following beneficial effects:

Technical scheme of the present invention. Calculate the theoretical power of the entire wind farm through the power generation of the benchmark units in each wind farm, and obtain the corresponding abandoned wind power of the wind farm through comparison with the actual power, and then obtain the curtailed wind power of the entire wind power base. It is not necessary to build a wind measuring tower for each wind farm, thereby achieving the advantages of simple operation, low cost and accurate calculation of abandoned wind power.

The technical solutions of the present invention will be described in further detail below with reference to the accompanying drawings and embodiments.

Description of drawings

Fig. 1 is a flow chart of a method for evaluating abandoned wind power of a large-scale wind power base based on a benchmark unit according to an embodiment of the present invention.

Detailed ways

The preferred embodiments of the present invention will be described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described here are only used to illustrate and explain the present invention, and are not intended to limit the present invention.

A method for evaluating the abandoned wind power of large-scale wind power bases based on benchmark units, including the following steps:

Step 1: Obtain the operating status of all units in the wind farm and the real-time output of each unit through the real-time information of the wind turbines uploaded by the wind farm every 5 minutes, and calculate the average output coefficient of all benchmark units in the wind farm every 5 minutes. The formula is as follows:

in, is the actual output of the i-th benchmark unit, is the stand-alone capacity of the i-th benchmark unit, and samp represents the set of benchmark units;

Step 2: Calculate the real-time start-up capacity of the wind farm every 5 minutes, the formula is as follows:

in, is the stand-alone capacity of the i-th unit, and start represents the set of starting units;

Step 3: Calculate the theoretical output of the wind farm every 5 minutes, the formula is as follows:

;

Step 4: Obtain the real-time output value R of the wind farm every 5 minutes through EMS (Energy Management System). When the theoretical output value T is greater than the actual output value R, it is considered that there is abandoned wind, so the abandoned wind power every 5 minutes is expressed as:

;

Step 5: The curtailed wind power of the entire wind farm within a certain period of time is expressed as:

The unit capacity of a wind farm is in MW, and the unit of abandoned wind power is MWh;

Step 6: Obtain the abandoned wind power of the entire wind power base by calculating the abandoned wind power of each wind farm in the wind power base.

Among them, when the output of the wind farm is limited, the benchmark unit of the wind farm remains in the normal power generation state; when the wind turbines including the benchmark unit need to be shut down, the output of the wind farm fan before the shutdown is used as the average limited power during the limited period , to calculate the curtailed wind power of the wind farm.

The following takes the specific operation of a wind farm as an example to describe in detail, as shown in Figure 1: When the power grid dispatching organization requires the wind farm to curtail power, the "benchmark unit" of the wind farm is not subject to power curtailment, and its power generation is used as the wind farm's similar power generation capacity. The theoretical power generation of the unit is subtracted from the actual power generation of similar units, and the curtailment limited power of the entire wind farm is obtained by summing.

Through the real-time information of the wind turbines uploaded every 5 minutes by the wind farm, the operating status of all units in the wind farm and the real-time output of each unit can be obtained. Calculate the average output coefficient of all benchmark units in a wind farm every 5 minutes

(1)

Calculate the real-time start-up capacity of the wind farm every 5 minutes

(2)

Calculate the theoretical output of the wind farm every 5 minutes

(3)

The real-time output value R of the wind farm every 5 minutes can be obtained through the EMS (Energy Management System). Since most power grid dispatching agencies have not yet formed a perfect power-limiting recording mechanism, when the theoretical output value T is greater than the actual output value R, it is considered that there is wind curtailment , so the curtailed wind power per 5 minutes can be expressed as:

(4)

Therefore, the curtailed wind power of the entire wind farm in a certain period of time can be expressed as:

(5)

If the unit capacity of a wind farm is in MW, the unit of abandoned wind power is MWh.

By calculating the curtailed wind power of each wind farm in the wind power base, the curtailed wind power of the entire wind power base can be obtained.

Among them, the determination of the benchmark units of the wind farm is in principle evenly distributed according to the geographical location and terrain, and units of different models and capacities can be selected to accurately reflect the overall actual power generation capacity of the wind farm. Each dispatching agency can jointly determine the benchmark unit with the wind farm according to the actual situation. In principle, the selection of the benchmark unit of the wind farm should not exceed 10% of the number of wind turbines. When the selected benchmark unit fails, the wind farm can replace the failed benchmark unit with an adjacent wind turbine and report it to the power dispatching agency in time.

When the output of the wind farm is limited, the benchmark unit of the wind farm will not participate in the load-limited adjustment in principle, and will always maintain a normal power generation state; The average curtailment power during the curtailment period is used to calculate the curtailed wind power of the wind farm.

Finally, it should be noted that: the above is only a preferred embodiment of the present invention, and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, it still The technical solutions recorded in the foregoing embodiments may be modified, or some technical features thereof may be equivalently replaced. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (2)

1. A method for evaluating the amount of abandoned wind power of a large-scale wind power base based on a benchmark unit, characterized in that it comprises the following steps: Step 1: Obtain the operating status of all units in the wind farm and the real-time output of each unit through the real-time information of the wind turbines uploaded by the wind farm every 5 minutes, and calculate the average output coefficient of all benchmark units in the wind farm every 5 minutes. The formula is as follows: in, is the actual output of the i-th benchmark unit, is the stand-alone capacity of the i-th benchmark unit, and samp represents the set of benchmark units; Step 2: Calculate the real-time start-up capacity of the wind farm every 5 minutes, the formula is as follows: in, is the stand-alone capacity of the i-th unit, and start represents the set of starting units; Step 3: Calculate the theoretical output of the wind farm every 5 minutes, the formula is as follows: Step 4: Obtain the real-time output value R of the wind farm every 5 minutes through EMS (Energy Management System). When the theoretical output value T is greater than the actual output value R, it is considered that there is abandoned wind, so the abandoned wind power every 5 minutes is expressed as: Step 5: The curtailed wind power of the entire wind farm within a certain period of time is expressed as: The unit capacity of a wind farm is in MW, and the unit of abandoned wind power is MWh; Step 6: Obtain the abandoned wind power of the entire wind power base by calculating the abandoned wind power of each wind farm in the wind power base. 2. The method for evaluating the abandoned wind power of a large-scale wind power base based on benchmark units according to claim 1, characterized in that, when the output of the wind farm is limited, the benchmark units of the wind farm maintain a normal power generation state; when the benchmark units are included When all wind turbines need to be shut down, the output of the wind farm fans before shutdown is used as the average curtailment power during the curtailment period to calculate the curtailed wind power of the wind farm.