CN107069836B - Method and system for measuring power generation demand capacity in automatic power generation control process - Google Patents
Method and system for measuring power generation demand capacity in automatic power generation control process Download PDFInfo
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Abstract
The invention relates to a method and a system for measuring power generation demand capacity in an automatic power generation control process. The method for measuring the power generation demand capacity in the automatic power generation control process comprises the following steps: in the automatic power generation control process, generating a regional load curve according to load data generated by a regional power grid at each moment in a set time period; in the automatic power generation control process, generating a tie line transmission power curve according to the corresponding tie line transmission power of the regional power grid at each moment in a set time period; calculating a power generation output curve of the regional power grid within a set time period according to the regional load curve and the tie line transmission power curve; and acquiring the maximum amplitude of the power generation output curve, and determining the maximum amplitude as the power generation required capacity. The determined power generation demand capacity has higher accuracy.
Description
Technical Field
The invention relates to the technical field of electric power, in particular to a method and a system for measuring power generation demand capacity in an automatic power generation control process.
Background
Automatic Generation Control (AGC) is an important real-time Control function of an electric power system, and is used for quickly and automatically adjusting the output of a generator set so as to meet the adjustment requirement of the frequency of the electric power system and the exchange power deviation index of a tie line and ensure the reliable supply of electric power. The frequency of the power system and the exchange power deviation index of the tie line essentially reflect the unbalance amount of the active power supply and demand of the power system in the range of the regulation area. According to the current power grid dispatching operation regulation, the frequency of the power system and the exchange power deviation of the tie line check indexes are taken as a check period within a certain specific time period (such as 10 minutes), the imbalance of supply and demand within the specific time period is regulated by means of automatic power generation control, and the imbalance of supply and demand exceeding the specific time period is eliminated by means of adjusting the output plan of the generator set by a power system dispatching attendant.
The demand of the power generation capacity of the power system is the automatic power generation control regulation capacity which is required to be reserved on the power generation side for ensuring the power balance of a power grid and avoiding the check of frequency and the exchange deviation of a connecting line according to the relevant regulations of the power grid operation. In order to ensure reliable power supply of the power system, sufficient requirements of the automatic power generation control and regulation capacity of the power system are required to be reserved in the manual adjustment and power generation planning process of a dispatcher.
The current automatic power generation control and power generation demand capacity of the power system is mainly determined by manual experience analysis of a power system dispatching attendant, and the determined power generation demand capacity is low in accuracy.
Disclosure of Invention
Therefore, it is necessary to provide a method and a system for measuring the required power generation capacity in the automatic power generation control process, aiming at the technical problem that the accuracy of the required power generation capacity determined by the conventional scheme is low.
A method for measuring the power generation demand capacity in the automatic power generation control process comprises the following steps:
in the automatic power generation control process, generating a regional load curve according to load data generated by a regional power grid at each moment in a set time period;
in the automatic power generation control process, generating a tie line transmission power curve according to the corresponding tie line transmission power of the regional power grid at each moment in a set time period;
calculating a power generation output curve of the regional power grid within a set time period according to the regional load curve and the tie line transmission power curve;
and acquiring the maximum amplitude of the power generation output curve, and determining the maximum amplitude as the power generation required capacity.
A power generation demand capacity measurement system in an automatic power generation control process, comprising:
the first generation module is used for generating a regional load curve according to load data generated by a regional power grid at each moment in a set time period in the automatic power generation control process;
the second generation module is used for generating a tie line transmission power curve according to the corresponding tie line transmission power of the regional power grid at each moment in a set time period in the automatic power generation control process;
the calculation module is used for calculating a power generation output curve of the regional power grid within a set time period according to the regional load curve and the tie line transmission power curve;
and the determining module is used for acquiring the maximum amplitude of the generated output curve and determining the maximum amplitude as the required power generation capacity.
According to the method and the system for measuring the power generation demand capacity in the automatic power generation control process, a regional load curve can be generated according to load data generated by a regional power grid at each moment in a set time period, a tie line transmission power curve is generated according to tie line transmission power corresponding to the regional power grid at each moment in the set time period, so that the power generation output curve of the regional power grid in the set time period is calculated, the determination of the power generation demand capacity of the regional power grid is realized, and the determined power generation demand capacity has high accuracy.
Drawings
FIG. 1 is a flowchart of a method for determining a required power generation capacity in an automatic power generation control process according to an embodiment;
fig. 2 is a schematic structural diagram of a power generation demand capacity measurement system in an automatic power generation control process according to an embodiment.
Detailed Description
The following describes in detail specific embodiments of the power generation demand capacity determination method and system in the automatic power generation control process according to the present invention with reference to the drawings.
Referring to fig. 1, fig. 1 is a flowchart illustrating a method for determining a required power generation capacity in an automatic power generation control process according to an embodiment, including the steps of:
s10, in the automatic power generation control process, generating a regional load curve according to load data generated by a regional power grid at each moment in a set time period;
the regional power grid may be a power grid corresponding to a certain region, such as a provincial power grid. The set time period may be a certain period of time before the current time, such as the previous day (yesterday), or the second day (previous day) ahead, or the like. And if the regional power grid is a power-saving power grid and the set time period is the previous day, the load data generated by the regional power grid at each moment in the set time period is the provincial load data of the previous day. The regional load curve may include a correspondence relationship between loads generated by the regional power grid in a set time period and respective times in the set time period, such as loads generated at a first time, loads generated at the first time, and the like.
S20, in the automatic power generation control process, generating a tie line transmission power curve according to the corresponding tie line transmission power of the regional power grid at each moment in a set time period;
the connecting line transmission power curve records the corresponding relation between the connecting line transmission power of the regional power grid and each moment in a set time period; such as the link transmission power corresponding to the first time, the link transmission power corresponding to the second time, etc. If the local grid is a power-saving grid and the set time period is the previous day, the tie line transmission power curve may be a tie line transmission power daily curve.
The automatic power generation control of the power system is used for eliminating the amount of power supply and demand unbalance within 5 minutes of time scale, so that the data accuracy of an area load curve and a tie line transmission power curve is lower than the time range, and the data accuracy of the area load curve and the tie line transmission power curve can be 10 seconds according to the current power system operation data acquisition accuracy; and the acquisition moments of the area load curve and the tie line transmission power curve are corresponding, namely, the moment sequence (including the starting time, the interval between any two adjacent moments and the ending moment) corresponding to the area load curve is completely consistent with the moment sequence corresponding to the tie line transmission power curve.
S30, calculating a power generation output curve of the regional power grid within a set time period according to the regional load curve and the tie line transmission power curve;
the tie line transmission power curve generally has a corresponding transmission direction, and the step may determine a corresponding power generation output curve according to the tie line transmission power curve and the transmission direction thereof, and the zone load curve.
In an embodiment, the calculating a generated output curve of the regional power grid within a set time period according to the regional load curve and the tie line transmission power curve may include:
identifying the transmission direction of the junctor transmission power corresponding to the junctor transmission power curve;
and if the junctor transmission power is in the sending direction, determining the power generation output curve according to the sum of the regional load curve and the junctor transmission power curve.
The determining the power generation output curve according to the sum of the regional load curve and the tie line transmission power curve may include: and adding the load data at any moment and the transmission power of the tie line corresponding to the moment, determining the sum obtained by adding as the generated output data corresponding to the moment, and determining the generated output data corresponding to each moment so as to determine a corresponding generated output curve.
As an embodiment, after the process of identifying the transmission direction of the tie line transmission power corresponding to the tie line transmission power curve, the method may further include:
and if the tie line transmission power is in the feeding direction, determining the generated output curve according to the difference between the regional load curve and the tie line transmission power curve.
The determining the generated output curve according to the difference between the zone load curve and the tie line transmission power curve may include: and subtracting the transmission power of the tie line corresponding to the moment from the load data at any moment, determining the difference obtained by subtraction as the generated output data corresponding to the moment, and determining the generated output data corresponding to each moment so as to determine a corresponding generated output curve.
The generated output curve determined by the embodiment has higher accuracy.
And S40, acquiring the maximum amplitude of the power generation output curve, and determining the maximum amplitude as the power generation required capacity.
In one embodiment, the obtaining the maximum amplitude of the generated output curve and determining the maximum amplitude as the required power generation capacity may include:
filtering the generated output curve, and counting the filtered generated output curve to obtain a generated output change amplitude distribution histogram corresponding to the generated output curve;
and identifying a maximum output change amplitude value from the power generation output change amplitude distribution histogram, and determining the maximum output change amplitude value as the power generation required capacity.
In the process of filtering the generated output curve, the automatic power generation control response time scale is 5 minutes, so that the automatic power generation control response time scale can be selected to be filtered at the frequency of 0.03Hz (Hertz), so as to reduce the interference of the related noise on the generated output curve. The generated output curve obtained by filtering can be counted according to the output variation amplitude of the generated output curve, and a generated output variation amplitude distribution histogram is obtained through statistics. The maximum output change amplitude is the theoretical value of the automatic power generation control demand, and the maximum output change amplitude is determined as the power generation demand capacity, so that the smoothness of power generation and power utilization of a power system is guaranteed.
According to the method for measuring the power generation demand capacity in the automatic power generation control process, a regional load curve can be generated according to load data generated by a regional power grid at each moment in a set time period, a tie line transmission power curve is generated according to tie line transmission power corresponding to the regional power grid at each moment in the set time period, so that the power generation output curve of the regional power grid in the set time period is calculated, the determination of the power generation demand capacity of the regional power grid is realized, and the determined power generation demand capacity has high accuracy.
In an embodiment, after the step of generating the tie line transmission power curve according to the tie line transmission power corresponding to each time of the regional power grid within the set time period in the automatic power generation control process, the method may further include:
acquiring a fault time period of a regional power grid within a set time period;
and correcting the load data in the fault time period on the regional load curve and the junctor transmission power data corresponding to the fault time period on the junctor transmission power curve.
According to the embodiment, the fault time period of the regional power grid in the set time period can be determined according to accidents of local power grid disconnection, tie line tripping and the like in the regional power grid. When a power grid has safety accidents such as local disconnection and tie line tripping, the load data such as provincial loads and the transmission power of the tie line can be greatly changed, automatic power generation control can quit in the period, and a power system dispatching attendant adjusts the output of a generator set according to the safety requirements of power system operation control after the accident. Since the automatic power generation control function of the power system is in the exit state during the occurrence of the fault, the grid operation during the fault is not taken into consideration in the process of measuring the required capacity for the automatic power generation control adjustment of the power system. In order to keep the consistency of the overall calculation effect of the invention, when electric power safety accidents such as automatic power generation control quitting of the electric power system and the like are caused by accident conditions such as local splitting of a power grid, tripping of a connecting line and the like, data information in a fault time period does not participate in the subsequent calculation process of the required capacity of automatic power generation control regulation of the electric power system. The load data in the fault time period on the regional load curve and the tie line transmission power data corresponding to the fault time period on the tie line transmission power curve can be corrected correspondingly by referring to the relevant historical data, and the load data in the fault time period on the regional load curve and the tie line transmission power data corresponding to the fault time period on the tie line transmission power curve can be removed, so that the accuracy of the regional load curve and the accuracy of the tie line transmission power curve can be guaranteed.
In an embodiment, before the process of generating the regional load curve according to the load data generated by the regional power grid at each time within the set time period in the automatic power generation control process, the method may further include:
acquiring a plurality of moments in a set time period; the interval between any two adjacent moments is a set time value;
and acquiring load data and tie line transmission power data which respectively correspond to the regional power grid at each moment.
The load data and the tie line transmission power data corresponding to each moment are acquired, and the accuracy of the subsequent determined area load curve and the accuracy of the tie line transmission power curve can be guaranteed.
As an example, the set time value may be less than or equal to 10 seconds.
The automatic power generation control of the power system is used for eliminating the amount of power supply and demand unbalance within 5 minutes of a time scale, so that the data accuracy of an area load curve and a tie line transmission power curve is lower than the time range, and according to the current running data acquisition accuracy of the power system, the data accuracy of the area load curve and the tie line transmission power curve can be smaller than or equal to 10 seconds, namely, in a time sequence corresponding to the area load curve and the tie line transmission power curve, the time interval between any two adjacent times is set to be a certain time interval value smaller than or equal to 10 seconds, so that the data accuracy of the area load curve and the tie line transmission power curve is ensured.
In an embodiment, after the obtaining the maximum amplitude of the generated output curve and determining the maximum amplitude as the required power generation capacity, the method may further include:
acquiring a measurement error corresponding to the determined power generation demand capacity;
and if the measurement error is larger than a set threshold value, increasing the power generation demand capacity by a unit value.
The measurement error may be determined based on an absolute value of a difference between the power generation demand capacity and an actual demand capacity of the regional power grid. The set threshold may be determined according to the measurement accuracy of the corresponding power generation demand capacity, and may be set to 0.8 or 1, for example. The actual demand capacity can be measured in real time, and can also be determined according to related historical data, such as the average output value of the regional power grid in a set time period; the measurement error may be determined from the monthly load average prediction error. The unit value can be determined according to the electricity demand characteristics of the regional power grid, can be determined to be 1 farad or 2 farad equivalent, the electricity generation demand capacity is increased by one unit value, namely, after the determined electricity generation demand capacity is added with one unit value, the obtained capacity value is determined as the electricity generation demand capacity of the regional power grid again.
As an embodiment, the process of obtaining the measurement error corresponding to the determined power generation demand capacity may include:
and acquiring a monthly load average prediction error of the regional power grid, and determining the monthly load average prediction error as a measurement error corresponding to the power generation demand capacity.
The load average prediction error of the previous month can be the load average prediction error of one month ahead of the current time.
The measurement error influences the response speed of the automatic power generation control capability of the power grid by influencing the planned output of the regional power grid generator set. When the measurement error is larger, more automatic power generation control regulation requirements need to be reserved. In the implementation process, according to the matching principle that the measurement error is adaptive to the adjustment capacity, the monthly load average prediction error can be counted, and the corresponding adjustment capacity is increased. The automatic power generation control adjustment requirement needs to increase the capacity corresponding to the load prediction deviation so as to meet the adjustment requirement caused by inaccurate prediction in actual operation.
The method for measuring the power generation demand capacity in the automatic power generation control process is based on the fluctuation quantity statistical analysis of load historical data in the corresponding region of the power grid, and provides a method for calculating the demand capacity of the power system for automatic power generation control regulation based on data distribution probability by considering a tie line exchange power plan; compared with other methods, the method has two remarkable differences: (1) starting from the physical meaning of automatic power generation control, based on the analysis of the historical distribution characteristics of loads in a region, considering two factors of a tie line exchange power plan, frequency and tie line exchange deviation assessment, and being capable of providing objective statistical results; (2) according to the related regulations of the national and power grid company accident abnormity, basic data of the power grid in the abnormal accident time period are removed, and analysis deviation caused by abnormal system operation accidents is avoided. The power generation demand capacity measuring process in the automatic power generation control process provided by the invention has the advantages of simple calculation flow, small calculation amount, small development difficulty, clear intermediate result meaning in the calculation process and strong practicability.
Referring to fig. 2, fig. 2 is a schematic structural diagram of a power generation demand capacity determination system in an automatic power generation control process according to an embodiment, including:
the first generation module 10 is used for generating a regional load curve according to load data generated by a regional power grid at each moment in a set time period in the automatic power generation control process;
the second generating module 20 is configured to generate a tie line transmission power curve according to the tie line transmission power corresponding to each time of the regional power grid within a set time period in the automatic power generation control process;
the calculation module 30 is configured to calculate a generated output curve of the regional power grid within a set time period according to the regional load curve and the tie line transmission power curve;
and the determining module 40 is configured to obtain a maximum amplitude of the generated output curve, and determine the maximum amplitude as the required power generation capacity.
The power generation demand capacity measurement system in the automatic power generation control process provided by the invention corresponds to the power generation demand capacity measurement method in the automatic power generation control process provided by the invention one to one, and the technical characteristics and the beneficial effects described in the embodiment of the power generation demand capacity measurement method in the automatic power generation control process are all applicable to the embodiment of the power generation demand capacity measurement system in the automatic power generation control process, so that the statement is made.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (9)
1. A method for measuring the power generation demand capacity in the automatic power generation control process is characterized by comprising the following steps:
in the automatic power generation control process, generating a regional load curve according to load data generated by a regional power grid at each moment in a set time period;
in the automatic power generation control process, generating a tie line transmission power curve according to the corresponding tie line transmission power of the regional power grid at each moment in a set time period;
calculating a power generation output curve of the regional power grid within a set time period according to the regional load curve and the tie line transmission power curve;
acquiring the maximum amplitude of the power generation output curve, and determining the maximum amplitude as the power generation required capacity;
the process of calculating the generated output curve of the regional power grid within a set time period according to the regional load curve and the tie line transmission power curve comprises the following steps:
identifying the transmission direction of the junctor transmission power corresponding to the junctor transmission power curve;
and if the junctor transmission power is in the sending direction, determining the power generation output curve according to the sum of the regional load curve and the junctor transmission power curve.
2. The method of measuring a required power generation capacity during automatic power generation control according to claim 1, further comprising, after the step of generating the tie line transmission power curve from the tie line transmission power corresponding to the regional power grid at each time within the set time period during the automatic power generation control:
acquiring a fault time period of a regional power grid within a set time period;
and correcting the load data in the fault time period on the regional load curve and the junctor transmission power data corresponding to the fault time period on the junctor transmission power curve.
3. The method of measuring a required power generation capacity during automatic power generation control according to claim 1, further comprising, before the step of generating a local load curve from load data generated by the local grid at each time point within a set time period during automatic power generation control:
acquiring a plurality of moments in a set time period; the interval between any two adjacent moments is a set time value;
and acquiring load data and tie line transmission power data which respectively correspond to the regional power grid at each moment.
4. The method of determining a required power generation capacity during automatic power generation control according to claim 3, wherein the set time value is less than or equal to 10 seconds.
5. The method of measuring a required power generation capacity during automatic power generation control according to any one of claims 1 to 4, further comprising, after the step of identifying a transmission direction of the tie line transmission power corresponding to the tie line transmission power curve:
and if the tie line transmission power is in the feeding direction, determining the generated output curve according to the difference between the regional load curve and the tie line transmission power curve.
6. The method of determining a required power generation capacity during automatic power generation control according to any one of claims 1 to 4, wherein the step of obtaining a maximum amplitude of the power generation output curve and determining the maximum amplitude as a required power generation capacity includes:
filtering the generated output curve, and counting the filtered generated output curve to obtain a generated output change amplitude distribution histogram corresponding to the generated output curve;
and identifying a maximum output change amplitude value from the power generation output change amplitude distribution histogram, and determining the maximum output change amplitude value as the power generation required capacity.
7. The method of determining a required power generation capacity during automatic power generation control according to any one of claims 1 to 4, wherein the step of obtaining a maximum amplitude of the power generation output curve and determining the maximum amplitude as a required power generation capacity further includes:
acquiring a measurement error corresponding to the determined power generation demand capacity;
and if the measurement error is larger than a set threshold value, increasing the power generation demand capacity by a unit value.
8. The method of measuring a required power generation capacity during automatic power generation control according to claim 7, wherein the step of obtaining the measurement error corresponding to the determined required power generation capacity includes:
and acquiring a monthly load average prediction error of the regional power grid, and determining the monthly load average prediction error as a measurement error corresponding to the power generation demand capacity.
9. A power generation demand capacity measurement system in an automatic power generation control process, comprising:
the first generation module is used for generating a regional load curve according to load data generated by a regional power grid at each moment in a set time period in the automatic power generation control process;
the second generation module is used for generating a tie line transmission power curve according to the corresponding tie line transmission power of the regional power grid at each moment in a set time period in the automatic power generation control process;
the calculation module is used for identifying the transmission direction of the junctor transmission power corresponding to the junctor transmission power curve; if the junctor transmission power is in the sending direction, determining the power generation output curve according to the sum of the regional load curve and the junctor transmission power curve;
and the determining module is used for acquiring the maximum amplitude of the generated output curve and determining the maximum amplitude as the required power generation capacity.
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