CN110535188B - Automatic active load adjustment method and system for cascade power station group - Google Patents
Automatic active load adjustment method and system for cascade power station group Download PDFInfo
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Abstract
The invention discloses a method and a system for automatically adjusting active load of a cascade power station group, which comprises the following steps: s100, a daily active load plan curve of each power station power grid of a drainage basin is issued through a non-control network II area scheduling support system, a given daily active load plan curve text file is automatically extracted, then the daily active load plan curve text file is automatically read by a control network I area computer monitoring system, corresponding data safety check is carried out, and the daily active load plan curve is converted into an active load regulation curve meeting power grid active load regulation rules through an algorithm; and S200, automatically issuing an active load regulation curve to AGC centralized control active set values of each power station in real time according to requirements by a control network I area computer monitoring system, and automatically adjusting the active load. The method can realize automatic adjustment of the active load at the side of the power station in the convection area, replace manual adjustment of a load plan curve, reduce the operation frequency of dispatching personnel, reduce the working pressure of daily dispatching on duty, improve the working efficiency and safety and improve the load adjustment precision.
Description
Technical Field
The invention belongs to the technical field of power dispatching, hydropower stations, cascade power station centralized control center operation and the like, and particularly relates to an automatic active load adjustment method and system for a cascade power station group.
Background
At present, the active load regulation has two types of power generation plans before the day and on-line output setting, and the active load needs to be adjusted manually according to the regulation rule. 1 load point every 15 minutes in a day-ahead power generation plan, totally 96 load points all day, and adjusting according to the climbing rate of the unit by adopting a point-to-point load adjustment in-place principle; and setting the on-line output, namely the fixed load, and adjusting the active load according to the climbing rate of the unit at the order adjusting moment until the active load is adjusted to the order adjusting value. The dispatching order is issued through a safe II area dispatching support system, the load of the power station and basin centralized control center adjusting unit is adjusted in a safe I area through a computer monitoring system, and after the load dispatching order is issued, manual adjustment needs to be carried out on the computer monitoring system according to the dispatching order value. Along with the maturity and development of the dispatching technology of the centralized control center, more and more cascade power station groups are connected to the drainage basin centralized control center for unified dispatching management, and along with the increase of remote control power stations of the centralized control center, the frequency and difficulty of load adjustment tasks performed by operators on duty are obviously increased, and the daily power generation plan examination electric quantity is also increased under the influence of manual adjustment precision. Frequent load adjustment, combined with high requirements on the ramp rate and precision of adjustment, puts a great pressure on daily scheduling and operation.
Disclosure of Invention
In order to solve the above problems in the prior art, the present invention aims to provide a method and a system for automatically adjusting an active load of a stepchain station group.
The technical scheme adopted by the invention is as follows:
the automatic active load adjusting method for the cascade power station group comprises the following steps:
s100, a daily active load plan curve of each power station power grid of a drainage basin is issued through a non-control network II area scheduling support system, a given daily active load plan curve text file is automatically extracted, then the daily active load plan curve text file is automatically read by a control network I area computer monitoring system, corresponding data safety check is carried out, and the daily active load plan curve is converted into an active load regulation curve meeting power grid active load regulation rules through an algorithm;
and S200, automatically issuing an active load regulation curve to AGC centralized control active set values of each power station in real time according to requirements by a control network I area computer monitoring system, and automatically adjusting the active load.
On the basis of the technical scheme, the method for automatically adjusting the active load of the cascade power station group comprises the steps that a daily active load plan curve is an active load plan curve of 96 points of the next day of a power station, an active load regulation curve is a centralized control value setting plan curve, and the centralized control value setting plan curve is generated by a scheduling daily plan curve, a scheduling present-day plan curve, a centralized control daily plan curve and a centralized control present-day plan curve.
On the basis of the technical scheme, the method for automatically adjusting the active load of the cascade power station group comprises the following steps:
a computer monitoring system in a control network I area automatically reads an assigned active load plan curve text file of 96 points of the next day of a power station from a scheduling support system in a non-control network II area at a fixed point every day, performs corresponding data security check, and converts the active load plan curve text file into a scheduling tomorrow plan curve through an algorithm;
scheduling a tomorrow plan curve according to the previous day, 23: after the last command is executed at the point 59, converting the last command into a current scheduling plan curve;
directly converting the scheduling tomorrow plan curve into a centralized control tomorrow plan curve;
according to the previous day centralized control tomorrow plan curve, on the previous day 23: after the last command is executed at the point 59, converting the last command into a centralized control today's plan curve;
and automatically generating a centralized control set value plan curve according to the centralized control today plan curve and the active load adjustment rule and interpolation operation per minute.
On the basis of the technical scheme, the method for automatically adjusting the active load of the cascade station group comprises the following specific generation method for automatically generating a centralized control set value plan curve according to a centralized control today plan curve and an active load adjustment rule and interpolation operation per minute:
after the power station receives an active load planning curve at 96 points of the next day of the power station, which is issued according to the previous day, namely a command for scheduling the current day planning curve to adjust the scheduled power station internet surfing output, the power station starts from the time point of the command to adjust the internet surfing output according to the active load planning curve at 96 points of the next day of the power station, namely the scheduling current day planning curve, and the internet surfing output is adjusted in place when each later time point arrives except the time point of the command.
Based on the above technical solution, in the step S200, the control network I area computer monitoring system automatically issues an active load adjustment curve to each station AGC centralized control active setting value in real time as required, and the flow of performing active load automatic adjustment is as follows:
s201, after the power station receives an active load plan curve adjustment plan power station network output regulation order of 96 points of the next day of the power station issued by the previous day, the AGC of the power station is put into centralized control closed-loop control;
s202, at the starting time point of the order, the automatic active load adjusting function of the power station is put into use;
s203, calculating the time for the on-line output to start changing of the active load automatic adjusting function according to the formula (1), namely the time for the first time load to start adjusting according to the climbing rate:
adjusting the time for starting adjustment of the load at each later time point according to a centralized control value plan curve;
s204, an active load value at a corresponding time point is issued to an AGC centralized control active set value of the power station according to a centralized control set value plan curve;
and S205, operating a power station AGC program, and adjusting an active load value to a planned value by the power station AGC according to the centralized control active set value, namely the centralized control active set value.
On the basis of the above technical solution, in the method for automatically adjusting the active load of the cascade station group, the time for starting adjustment of the load at each subsequent time point is calculated as follows:
if it is
The variation time (hour: minute) of the on-line output start is calculated by the formula (2):
if it is
And the planning power station adjusts the internet surfing output to a later time point from the current time point according to the load climbing rate, the later time point is changed into the former time point after the later time point is reached, the judgment is carried out again, then the time of the change of the internet surfing output is calculated through a formula (2), and the planning power station is a planning unit.
The system of the automatic active load adjustment method of the cascade power station group comprises a centralized control center side, a drainage basin power station side and a longitudinal encryption device which is arranged between the centralized control center side and the drainage basin power station side and used for carrying out encryption authentication on the centralized control center side and the drainage basin power station side;
the centralized control center side comprises a non-control network II area scheduling support system, a control network I area computer monitoring system and a firewall which is arranged between the non-control network II area scheduling support system and the control network I area computer monitoring system and controls the access of the non-control network II area scheduling support system and the control network I area computer monitoring system;
the non-control network II area dispatching support system issues daily active load plan curves of power grids of all power stations in a drainage basin, and automatically extracts issued daily active load plan curve text files;
the control network I area computer monitoring system automatically reads the daily active load plan curve text file, performs corresponding data security check, converts the daily active load plan curve into an active load regulation curve meeting the power network active load regulation rule through an algorithm, automatically sends the active load regulation curve to AGC centralized control active set values of each power station in real time according to requirements, and performs automatic active load regulation.
On the basis of the technical scheme, the system of the method for automatically adjusting the active load of the cascade station group comprises a control network I area computer monitoring system, a control network I area computer monitoring system and a control network I area computer monitoring system, wherein the control network I area computer monitoring system comprises a production management information server and a high-level application server;
the production management information server automatically reads the daily active load plan curve text file and performs corresponding data security check;
the advanced application server converts the daily active load plan curve into an active load regulation curve meeting the power grid active load regulation rule through an algorithm, automatically transmits the active load regulation curve to AGC centralized control active set values of each power station in real time according to requirements, and performs automatic active load regulation.
On the basis of the technical scheme, the system of the method for automatically adjusting the active load of the cascade station group comprises a control network I area computer monitoring system and an operator station, wherein the control network I area computer monitoring system is used for carrying out AGC (automatic gain control) switching on and off of a power station and automatic active load adjusting function switching on and off according to a regulation;
the computer monitoring system of the control network I area also comprises a gateway machine which is communicated with the power station and is used for communicating with the power station side of the drainage basin, and a centralized control active set value sent by a high-level application server of the computer monitoring system of the control network I area is transmitted to the power station side of the drainage basin through an IEC104 protocol.
On the basis of the technical scheme, the system of the method for automatically adjusting the active load of the cascade power station group comprises a gateway machine and a power station advanced application server which are communicated with a centralized control unit on the side of the basin power station;
the gateway machine which is communicated with the centralized control is used for communicating with the centralized control center side and transmitting the received centralized control active setting value to the advanced application server of the computer monitoring system at the side of the power station of the drainage basin;
and the power station advanced application server operates a power station AGC program and adjusts the active load value to a planned value according to the centralized control active set value, namely the centralized control active set value.
The invention has the beneficial effects that:
the invention has the function of automatically adjusting the active load, can be realized in a computer monitoring system at the side of a basin cascade centralized control center, can realize the automatic adjustment of the active load at the side of a basin power station according to the regulation rule of the power grid load, replaces the manual regulation of a load plan curve, reduces the operation frequency of a dispatcher, reduces the working pressure of daily dispatching on duty, improves the working efficiency and the safety, can improve the load regulation precision, and reduces the checking electric quantity caused by the problem of the regulation precision to a certain extent.
Drawings
Fig. 1 is a schematic flow chart illustrating the generation of an active load regulation curve in an automatic active load adjustment method for a cascaded station group according to an embodiment of the present invention.
Fig. 2 is a flowchart illustrating an automatic adjustment method for an active load of a cascade power station group according to an embodiment of the present invention.
Fig. 3 is a system block diagram of an automatic active load adjustment system of a stepchain station group according to an embodiment of the present invention.
Detailed Description
The invention is further described with reference to the following figures and specific embodiments.
Example (b):
as shown in fig. 1 to 3, the method for automatically adjusting the active load of the stepchain station group of the present embodiment includes the following steps:
s100, a daily active load plan curve of each power station power grid of a drainage basin is issued through a non-control network II area scheduling support system, a given daily active load plan curve text file is automatically extracted, then the daily active load plan curve text file is automatically read by a control network I area computer monitoring system, corresponding data safety check is carried out, and the daily active load plan curve is converted into an active load regulation curve meeting power grid active load regulation rules through an algorithm;
and S200, automatically issuing an active load regulation curve to AGC centralized control active set values of each power station in real time according to requirements by a control network I area computer monitoring system, and automatically adjusting the active load.
In step S100, the daily active load planning curve is an active load planning curve at 96 points of the next day of the power station.
In step S100, the active load regulation curve is a centralized control value plan curve, and the centralized control value plan curve is generated from a scheduling tomorrow plan curve, a scheduling today plan curve, a centralized control tomorrow plan curve, and a centralized control today plan curve, as shown in fig. 1.
The method for acquiring the scheduling tomorrow plan curve comprises the following steps:
a production management information server of a computer monitoring system in a control network I area automatically reads an active load plan curve text file (generally a text in a txt format, and then converts the active load plan curve text file into a data format text used by the computer monitoring system) at 96 points (one point every 15 minutes, 96 points from 00: 15 to 24: 00) of the next day of a power station issued from a scheduling support system in a non-control network II area at 23 points every day, and performs corresponding data security check, and a high-level application server of the computer monitoring system in the control network I area converts the active load plan curve text file into a scheduling bright day plan curve through an algorithm; and if the active load plan curve text file of 96 points of the next day of the power station issued by the non-control network II area dispatching support system is not read, alarming, reading again every 5 minutes, and if 30 minutes of 23 points are not read, exiting.
The generation method of the scheduling present planning curve comprises the following steps:
scheduling a tomorrow plan curve according to the previous day, 23: after the last call is executed at 59, it is converted into a schedule today's plan curve.
The generation method of the centralized control tomorrow plan curve comprises the following steps:
and directly converting the scheduling tomorrow plan curve into a centralized control tomorrow plan curve.
The generation method of the centralized control today's planning curve comprises the following steps:
according to the previous day centralized control tomorrow plan curve, on the previous day 23: and 59, after the last command is executed, converting the last command into a centralized control today's planning curve.
The generation method of the centralized control value setting plan curve comprises the following steps of;
according to the centralized control today's plan curve, according to the active load adjustment rule, automatically generating a centralized control setting value plan curve according to the interpolation operation per minute (according to the principle that the ramp rate of the planned power station (load) is adjusted in place according to the arrival point, carrying out inverse calculation on the value per minute and automatically assigning to generate the centralized control setting value plan curve, and in the no-load change time period, two lines are overlapped).
The specific generation method of the centralized control value setting plan curve comprises the following steps:
after the power station receives a command for regulating the planned power station internet surfing output of the power station at 96 points of the next day of the power station given by the previous day, the power station regulates the internet surfing output according to the planned active load curve at 96 points of the next day of the power station from the time point of the command, and the internet surfing output is regulated in place when each later time point arrives except the time point of the command, namely the arrival point is reached.
The time for starting adjustment of the load at each subsequent time point is calculated according to the formula (2):
if it is
The variation time (hour: minute) of the online output start is as follows:
if it is
And the planning power station adjusts (increases or decreases) the internet surfing output to a later time point from the current time point according to the load climbing rate, the later time point is changed into the former time point after the later time point is reached, the judgment is carried out again, then the time when the internet surfing output starts to change is calculated through a formula (2), namely the time when the first load starts to be adjusted according to the climbing rate, and the planning power station is a planning unit. As shown in table 1.
TABLE 1 Power station scheduling today's planning curve (same centralized control today's planning curve is consistent)
Adjusting according to a curve, calculating the time of the start change of the power output on the internet according to a formula (2), and introducing data, wherein an active load plan curve 9 of 96 points of the next day of the power station is as follows: load of 45 300MW, 10: 00 load of 150MW, according to the principle of 'adjusting to the right position at the arrival point', and according to the formula (2):
namely 9: the 57 load begins to adjust for the load ramp rate.
Therefore, a centralized control value planning curve is inversely calculated according to the centralized control today planning curve, as shown in table 2:
TABLE 2 centralized control value setting plan curve
As shown in fig. 2, the computer monitoring system in the area I of the control network automatically issues the active load regulation curve to the AGC centralized control active setting values of each power station in real time according to the requirement, and the flow of performing the active load automatic adjustment is as follows:
s201, after the power station receives an active load plan curve adjustment plan power station network output regulation order of 96 points of the next day of the power station issued by the previous day, the AGC of the power station is put into centralized control closed-loop control;
s202, at the starting time point of the order, the automatic active load adjusting function of the power station is put into use;
s203, calculating the time for the on-line output to start changing of the active load automatic adjusting function according to the formula (1), namely the time for the first time load to start adjusting according to the climbing rate:
adjusting the time for starting adjustment of the load at each later time point according to a centralized control value plan curve;
s204, an active load value at a corresponding time point is issued to an AGC centralized control active set value of the power station according to a centralized control set value plan curve;
s205, operating a power station AGC program, and adjusting an active load value to a planned value by the power station AGC according to a centralized control active set value, namely the centralized control active set value;
and when a new order is received, the automatic active load adjusting function of the power station is quitted.
As shown in fig. 3, the automatic active load adjustment system for the cascade power station group includes a centralized control center side, a drainage basin power station side, and a longitudinal encryption device disposed between the centralized control center side and the drainage basin power station side;
the centralized control center side comprises a non-control network II area scheduling support system, a control network I area computer monitoring system and a firewall which is arranged between the non-control network II area scheduling support system and the control network I area computer monitoring system and used for controlling the access of the non-control network II area scheduling support system and the control network I area computer monitoring system, so that the logic isolation is realized;
the non-control network II area dispatching support system issues daily active load plan curves of power grids of all power stations in a drainage basin, and automatically extracts issued daily active load plan curve text files;
a computer monitoring system in a control network I area automatically reads a daily active load plan curve text file (generally a txt format text, and then converts the daily active load plan curve into a data format text used by the computer monitoring system), performs corresponding data security check, converts the daily active load plan curve into an active load regulation curve meeting the power grid active load regulation rule through an algorithm, automatically sends the active load regulation curve to AGC centralized control active set values of each power station in real time according to requirements, and performs automatic active load regulation;
the longitudinal encryption device realizes encryption authentication of the centralized control center side and the drainage basin power station side.
The computer monitoring system of the control network I area comprises a production management information server and a high-level application server, wherein the production management information server automatically reads a daily active load plan curve text file (generally a text in txt format and then converts the daily active load plan curve text file into a text in data format used by the computer monitoring system) and performs corresponding data security check; the advanced application server converts the daily active load plan curve into an active load regulation curve meeting the power grid active load regulation rule through an algorithm, automatically transmits the active load regulation curve to AGC centralized control active set values of each power station in real time according to requirements, and performs automatic active load regulation.
The longitudinal encryption device is arranged between the control network I area computer monitoring system and each power station at the side of the drainage basin power station.
The computer monitoring system of the control network I area also comprises an operator station which performs AGC switching on and off of the power station and automatic active load adjustment function switching on and off according to the regulation.
The computer monitoring system of the control network I area also comprises a network shutdown machine which is communicated with the power station and communicated with the power station side of the drainage basin, and a centralized control active set value sent by a high-level application server of the computer monitoring system of the control network I area is transmitted to the power station side of the drainage basin through an IEC104 protocol and communicated with the centralized control machine.
The drainage basin power station side comprises a gateway machine and a power station advanced application server which are communicated with the centralized control, wherein the gateway machine communicated with the centralized control is communicated with the centralized control center side, and transmits the received centralized control active setting value to the drainage basin power station side computer monitoring system advanced application server; and the power station advanced application server operates a power station AGC program and adjusts the active load value to a planned value according to the centralized control active set value, namely the centralized control active set value.
Other functional designs of the cascade power station group active load automatic adjusting system are as follows:
when the power station online planned output is changed, if the upper limit of the adjustable range of the AGC active load value-the active load planned value at the next time point is less than 0, alarming is carried out in advance for 10 minutes (can be set), and a unit needing to be started is sent out; and the upper limit of the adjustable range of the AGC active load value-the active load planned value at the next time point is larger than the single machine capacity of the power station, and the real-time alarm reminding is carried out to send out the prompt of the group needing to be shut down.
If the active load planning curve changes in the day, the centralized control current planning curve is automatically and synchronously updated, and a manual trigger curve updating button is arranged.
Setting a minimum active load and an alarm window, wherein an operator on duty can reversely calculate the corresponding minimum operating load (which is a parameter which can be set in the system) according to the minimum leakage flow of each power station and set the minimum operating load, when the planned output of the power station on the internet changes, the computer monitoring system judges whether the planned active load meets the minimum operating load in advance, and when the planned active load is lower than the minimum operating load, the computer monitoring system alarms in advance for 10 minutes (which can be set); if the plant has no minimum load setting limit, it is set to 0.
And judging the rationality of the active load instruction issuing: before the active setting value of the power station AGC is centrally controlled, whether the value is reasonable or not is detected according to the relevant operation parameters of the power station AGC, and if the value is not reasonable, the value is assigned again. The method comprises the following steps: the vibration area can not fall into an AGC total station vibration area, can not exceed the upper limit and the lower limit of an adjustable range, can not exceed the step length of AGC single step adjustment, and the like; if the lower power station AGC centralized control active setting value is in the AGC total station vibration area, the centralized control active setting value is adjusted to be executed by avoiding the nearest value of the upper boundary and the lower boundary of the vibration area; and when the difference value between the planned value of the active load of the power station and the real value of the active load of the whole station is more than 20MW and exceeds 2 minutes, giving an alarm.
The invention has the function of automatically adjusting the active load, can be realized in a computer monitoring system at the side of a basin cascade centralized control center, can realize the automatic adjustment of the active load at the side of a basin power station according to the regulation rule of the power grid load, replaces the manual regulation of a load plan curve, reduces the operation frequency of a dispatcher, reduces the working pressure of daily dispatching on duty, improves the working efficiency and the safety, can improve the load regulation precision, and reduces the checking electric quantity caused by the problem of the regulation precision to a certain extent.
The invention is not limited to the above alternative embodiments, and any other various forms of products can be obtained by anyone in the light of the present invention, but any changes in shape or structure thereof, which fall within the scope of the present invention as defined in the claims, fall within the scope of the present invention.
Claims (2)
1. The automatic active load adjusting method of the cascade power station group is characterized by comprising the following steps of: the method comprises the following steps:
s100, a daily active load plan curve of each power station power grid of a drainage basin is issued through a non-control network II area scheduling support system, a given daily active load plan curve text file is automatically extracted, then the daily active load plan curve text file is automatically read by a control network I area computer monitoring system, corresponding data safety check is carried out, and the daily active load plan curve is converted into an active load regulation curve meeting power grid active load regulation rules through an algorithm;
s200, a computer monitoring system in a control network I area automatically issues an active load regulation curve to AGC centralized control active set values of each power station in real time according to requirements, and active load is automatically adjusted;
the daily active load plan curve is an active load plan curve of 96 points of the next day of the power station, the active load regulation curve is a centralized control value setting plan curve, and the centralized control value setting plan curve is generated by a scheduling tomorrow plan curve, a centralized control tomorrow plan curve and a centralized control tomorrow plan curve;
the generation method of the centralized control value setting plan curve comprises the following steps:
a computer monitoring system in a control network I area automatically reads an assigned active load plan curve text file of 96 points of the next day of a power station from a scheduling support system in a non-control network II area at a fixed point every day, performs corresponding data security check, and converts the active load plan curve text file into a scheduling tomorrow plan curve through an algorithm;
scheduling a tomorrow plan curve according to the previous day, 23: after the last command is executed at the point 59, converting the last command into a current scheduling plan curve;
directly converting the scheduling tomorrow plan curve into a centralized control tomorrow plan curve;
according to the previous day centralized control tomorrow plan curve, on the previous day 23: after the last command is executed at the point 59, converting the last command into a centralized control today's plan curve;
automatically generating a centralized control set value plan curve according to the centralized control today plan curve and an active load adjustment rule and interpolation operation per minute;
the specific generation method for automatically generating the centralized control set value plan curve according to the centralized control today plan curve and the active load adjustment rule and the interpolation operation per minute comprises the following steps:
after the power station receives an active load plan curve at 96 points of the next day of the power station, which is issued on the previous day, namely a command for scheduling the current day plan curve to adjust the power station online output, the power station starts to adjust the online output according to the active load plan curve at 96 points of the current day of the power station, namely the current day plan curve, from the time point of the command, and the online output is adjusted in place when each later time point arrives except the time point of the command;
in step S200, the computer monitoring system in the area I of the control network automatically issues the active load regulation curve to the AGC centralized control active setting values of each power station in real time according to the requirements, and the process of automatically adjusting the active load is as follows:
s201, after the power station receives an active load plan curve adjustment plan power station network output regulation order of 96 points of the next day of the power station issued by the previous day, the AGC of the power station is put into centralized control closed-loop control;
s202, at the starting time point of the order, the automatic active load adjusting function of the power station is put into use;
s203, calculating the time for the on-line output to start changing of the active load automatic adjusting function according to the formula (1), namely the time for the first time load to start adjusting according to the climbing rate:
adjusting the time for starting adjustment of the load at each later time point according to a centralized control value plan curve;
s204, an active load value at a corresponding time point is issued to an AGC centralized control active set value of the power station according to a centralized control set value plan curve;
and S205, operating a power station AGC program, and adjusting an active load value to a planned value by the power station AGC according to the centralized control active set value, namely the centralized control active set value.
2. The automatic cascaded power station group active load adjusting method according to claim 1, wherein: the time for starting adjustment of the load at each subsequent time point is calculated as follows: :
if it is
The variation time (hour: minute) of the on-line output start is calculated by the formula (2):
if it is
And the planning power station adjusts the internet surfing output to a later time point from the current time point according to the load climbing rate, the later time point is changed into the former time point after the later time point is reached, the judgment is carried out again, then the time of the change of the internet surfing output is calculated through a formula (2), and the planning power station is a planning unit.
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