CN114285084A - Cooperative control method for fusion sensing of line source end and tail end - Google Patents
Cooperative control method for fusion sensing of line source end and tail end Download PDFInfo
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Abstract
The invention discloses a cooperative control method for fusion perception of a line source end and a line tail end. The problem of voltage fluctuation caused by output randomness superposed load fluctuation after large-scale high-proportion new energy grid connection is solved; the invention comprises the following steps: s1: respectively establishing output-voltage fluctuation curves of a line source end and a line tail end of each distributed power supply station; s2: acquiring voltage values of a source end and a tail end of a line in real time, respectively calculating voltage fluctuation of the line, and searching a control object when the voltage fluctuation exceeds a limit; s3: acquiring environmental factors in a period of time before the voltage fluctuation exceeds the limit, respectively calculating the output change of each distributed power supply station, and determining the distributed power supply station to be controlled by matching the output change of the corresponding period of time with the voltage fluctuation change; s4: sequentially carrying out two-stage regulation and control of execution level regulation and control in a power station and coordination level regulation and control in a power grid; and the object to be controlled is controlled in a targeted manner, so that the voltage fluctuation caused by the random fluctuation of new energy treatment is reduced.
Description
Technical Field
The invention relates to the field of distributed power supply grid connection, in particular to a cooperative control method for fusion sensing of a line source end and a line tail end.
Background
With the development of national economy and the exhaustion of traditional energy, a large number of distributed power supplies have been produced according to the characteristics of cleanness, high efficiency, flexibility and the like, and the intensive development of the distributed power supply technology becomes a focus of attention in the current power industry. However, due to the maximum power point tracking characteristic of the distributed power supply, the output power of the distributed power supply fluctuates continuously under the influence of factors such as external environment, and the fluctuation of the power inevitably causes voltage fluctuation.
With the gradual development of the distributed power supply, the voltage fluctuation caused by the output randomness superposed load fluctuation after the large-scale high-proportion new energy is connected to the grid is difficult to be well regulated and controlled.
For example, in a method for suppressing voltage fluctuation at a grid-connected point and a new energy power station disclosed in chinese patent literature, a publication No. CN113067342A first controls active power variation of each power generation branch in a reactive parameter setting time period, and determines reactive power of each power generation branch at each active power with a goal of stabilizing a voltage at a grid-connected point at a reference voltage; then determining a relation value between each reactive power and corresponding active power of each power generation branch, and fitting the relation value with the corresponding active power to obtain a fitting curve; under the normal operation state, each power generation branch can determine corresponding reactive power and output the reactive power in real time according to the fitting curve of the power generation branch and the current active power, and the voltage of a grid-connected point can be ensured to be stable at the reference voltage.
The scheme can not solve the problem of voltage fluctuation caused by output randomness superposed load fluctuation after large-scale high-proportion new energy grid connection.
Disclosure of Invention
The method mainly solves the problem of voltage fluctuation caused by output randomness superposed load fluctuation after large-scale high-proportion new energy grid connection in the prior art; a cooperative control method for fusion sensing of a line source end and a line tail end is provided.
The technical problem of the invention is mainly solved by the following technical scheme:
a cooperative control method for fusion sensing of a line source end and a line tail end comprises the following steps:
s1: respectively establishing output-voltage fluctuation curves of a line source end and a line tail end of each distributed power supply station;
s2: acquiring voltage values of a source end and a tail end of a line in real time, respectively calculating voltage fluctuation of the line, and searching a control object when the voltage fluctuation exceeds a limit;
s3: acquiring environmental factors in a period of time before the voltage fluctuation exceeds the limit, respectively calculating the output change of each distributed power supply station, and determining the distributed power supply station to be controlled by matching the output change of the corresponding period of time with the voltage fluctuation change;
s4: sequentially carrying out two-stage regulation and control of execution level regulation and control in a power station and coordination level regulation and control in a power grid;
s5: the process returns to step S2 to be executed in a loop.
By means of fusion sensing of a line source end and a line tail end and combination of an established output-voltage fluctuation curve, when voltage fluctuation exceeds the limit, the grid-connected position of a distributed power supply station with output fluctuation is located, two-stage regulation and control are conducted on the grid-connected position, the control is conducted in a targeted mode, and voltage fluctuation caused by output random overlapping load fluctuation after a large amount of new energy is connected to the grid is reduced.
Preferably, for distributed power supply stations in the same grid-connected position and the same type, the output-voltage fluctuation curve obtained at the source end of the line and the output-voltage fluctuation curve at the tail end of the line are respectively established in the state that the reactive compensation is 0.
When the output of the distributed power supply station at different positions changes, the voltage fluctuation at the line source end and the line tail end is different; the voltage fluctuation is maximum at the grid-connected point and decreases progressively from the grid-connected point to the line source end. And the grid-connected position of the distributed power supply station can be judged by comprehensively looking up a table according to the voltage fluctuation values of the source end and the tail end of the line.
Preferably, the distributed power supply station establishes the output-voltage fluctuation curves of the line source end and the line tail end under the maximum load and the output-voltage fluctuation curves of the line source end and the line tail end under the minimum load respectively.
According to different loads, different final regulation and control means are selected, and the control efficiency is improved; and limiting the range according to the output-voltage fluctuation curve under the conditions of maximum load and minimum load, and taking the range as a limiting condition when selecting the object.
Preferably, the step S3 specifically includes the following steps:
s301: dividing a natural day into a plurality of time periods, and acquiring the time period of the voltage fluctuation overrun moment and the environmental factors of the previous time period;
s302: comparing environmental factors and output data in a historical database to obtain output curves of all distributed power stations in the previous time period and the current time period;
s303: acquiring voltage fluctuation data of a source end and a tail end of a line in a current time period and a last time period;
s304: aligning the output curve and the voltage fluctuation in time, matching the output-voltage fluctuation curves of the source end and the tail end of the line, and determining the corresponding distributed power station or the distributed power station combination to be controlled at the moment when the voltage fluctuation exceeds the limit.
The data acquired in real time are used for positioning an object to be controlled by inquiring the output-voltage fluctuation curve, so that targeted regulation and control are realized, and voltage fluctuation caused by random fluctuation of new energy processing is reduced.
Preferably, judging whether output-voltage fluctuation curves of a line source end and a line tail end of a single distributed power supply station match output curve changes and voltage fluctuation changes at the moment that the voltage fluctuation exceeds the limit; if so, the distributed power supply station is the distributed power supply station needing to be controlled; otherwise, carrying out the next judgment;
splitting voltage fluctuation, and matching the output combination of a plurality of distributed power supply stations at each moment through the output-voltage fluctuation curves of the line source end and the line tail end according to the output curves;
selecting a power output combination of the distributed power supply stations at the moment when the voltage fluctuation exceeds the limit, and comparing the sum of distances from grid-connected positions of the distributed power supply stations to a line source end; and selecting a group of distributed power supply stations with the minimum distance sum as the distributed power supply stations needing to be controlled.
And the object to be controlled is controlled in a targeted manner, so that the voltage fluctuation caused by the random fluctuation of new energy treatment is reduced.
Preferably, the output combination of the distributed power supply stations is continuously judged, and the output combination of the distributed power supply stations at the moment when the voltage fluctuation exceeds the limit is screened;
judging whether all the distributed power supply stations in the combination exist in the output combination of the distributed power supply stations at the previous moment; if yes, reserving; otherwise, the screen is removed.
Although the output of the new energy power supply has randomness, sudden change does not occur, time continuity judgment is carried out on the combination of the distributed power supply stations, and wrong combinations are deleted.
Preferably, the step S4 includes the following steps:
s401: regulating and controlling through an executive device in a distributed power station to be controlled; the internal execution device comprises a capacitor bank and a transformer tap;
s402: calculating voltage fluctuation of a line source end and a line tail end after execution level regulation in the power station, judging whether the voltage meets regulation requirements, and if not, executing coordination level regulation in the power grid; if yes, go to step S5;
s403: sequentially judging the influence level of the distributed power supply stations at all grid-connected positions on the voltage from the source end of the line to the tail end of the line, and regulating and controlling the reactive power of the distributed power supply stations when the influence level exceeds an influence threshold;
s404: judging whether the regulated voltage meets the regulation requirement, if so, entering a step S5; if not, returning to the step S403 to perform the judgment and regulation of the next distributed power supply station.
Two-stage regulation and control are adopted, so that the set value is more closely tracked, and the regulation and control are more reliable.
Preferably, when the distribution network is in a small load, the adjustment and control are carried out only by increasing the adjustable range of the tap joint of the transformer;
when the distribution network is under a large load, the capacity of the capacitor single group, the number of the capacitor groups and the adjustable range of the tap joint of the transformer are increased simultaneously for regulation and control.
Different regulation strategies are adopted according to different distribution network loads, so that the voltage and reactive power changes caused by accessing a distributed power supply are returned to an allowable range under the existing strategy, the system is ensured to have electric energy with good quality, the distribution network voltage conforms to an expected range, and the normal requirements of the system can be met. The device can still ensure the qualification of voltage and reactive power to the maximum extent under the condition that the active power output of the distributed power supply changes greatly, and ensure that the conditions of unstable voltage and the like caused by overlarge unit regulation amount can not occur, so that the quality of the electric energy of the system is good.
Preferably, the calculation process of the influence level of the distributed power supply station on the voltage is as follows:
taking the grid-connected position of the distributed power supply station as a coefficient, and multiplying the coefficient by the voltage fluctuation of the corresponding line source end to obtain the influence level of the distributed power supply station on the voltage;
d is the influence level of the distributed power supply station on the voltage;
l is the distance from the grid-connected position of the distributed power station to the source end of the line;
and W is the source voltage fluctuation corresponding to the distributed power supply station in the time period of voltage fluctuation overrun.
And preferentially selecting a power station which is close to the source end of the line and causes large voltage fluctuation.
Preferably, the distributed power station includes but is not limited to photovoltaic power station, wind power station and hydropower station; environmental factors include temperature, wind, light intensity and rainfall. The output power of the distributed power supply is influenced by factors such as external environment and the like, and the condition of continuous fluctuation is generated, and the output condition of the new energy power supply station can be deduced according to different environmental factors.
The invention has the beneficial effects that:
1. by means of fusion sensing of a line source end and a line tail end and combination of an established output-voltage fluctuation curve, when voltage fluctuation exceeds the limit, the grid-connected position of a distributed power supply station with output fluctuation is located, two-stage regulation and control are conducted on the grid-connected position, the control is conducted in a targeted mode, and voltage fluctuation caused by output random overlapping load fluctuation after a large amount of new energy is connected to the grid is reduced.
2. According to different loads, different final regulation and control means are selected, and the control efficiency is improved.
3. And the object to be controlled is controlled in a targeted manner, so that the voltage fluctuation caused by the random fluctuation of new energy treatment is reduced.
4. Two-stage regulation and control are adopted, so that the set value is more closely tracked, and the regulation and control are more reliable.
Drawings
Fig. 1 is a flowchart of a cooperative control method of the present invention.
Detailed Description
The technical scheme of the invention is further specifically described by the following embodiments and the accompanying drawings.
Example (b):
a cooperative control method for fusion sensing of a line source end and a line tail end in this embodiment, as shown in fig. 1, includes the following steps:
s1: and respectively establishing output-voltage fluctuation curves of the line source end and the line tail end of each distributed power supply station.
The distributed power supply station respectively establishes an output-voltage fluctuation curve of the line source end and the line tail end under the maximum load and an output-voltage fluctuation curve of the line source end and the line tail end under the minimum load.
According to different loads, different final regulation and control means are selected, and the control efficiency is improved; and limiting the range according to the output-voltage fluctuation curve under the conditions of maximum load and minimum load, and taking the range as a limiting condition when selecting the object.
And respectively establishing an output-voltage fluctuation curve obtained at the source end of the line and an output-voltage fluctuation curve at the tail end of the line for the distributed power supply stations at the same grid-connected position and the same type under the condition that the reactive compensation is 0.
When the output of the distributed power supply station at different grid-connected positions changes, the voltage fluctuation of the source end and the tail end of the line is different, the voltage fluctuation is the largest at a grid-connected point, and the voltage fluctuation is gradually reduced from the grid-connected point to the source end of the line. The forces of the different types of distributed power stations are also subject to different interference from environmental factors. And the grid-connected position of the distributed power station can be judged by comprehensively looking up a table according to the voltage fluctuation values of the source end and the tail end of the line and the type of the power station.
In the present embodiment, the distributed power plant includes, but is not limited to, photovoltaic power plants, wind power plants, and hydroelectric power plants; environmental factors include temperature, wind, light intensity and rainfall.
The output power of the distributed power supply is influenced by factors such as external environment and the like, and the condition of continuous fluctuation is generated, and the output condition of the new energy power supply station can be deduced according to different environmental factors.
S2: and acquiring voltage values of the source end and the tail end of the line in real time, respectively calculating voltage fluctuation of the line, and searching a control object when the voltage fluctuation exceeds the limit.
The voltage fluctuation was calculated as:
wherein d is a voltage fluctuation value;
Umaxmaximum value of voltage root mean square (voltage effective value) fluctuation;
Uminis the minimum value of voltage root mean square (voltage effective value) fluctuation;
UNis the nominal voltage.
S3: obtaining environmental factors in a period of time before the voltage fluctuation exceeds the limit, respectively calculating the output change of each distributed power supply station, and determining the distributed power supply station to be controlled by matching the output change of the corresponding period of time with the voltage fluctuation change.
S301: a natural day is divided into a plurality of time periods, and the time period of the voltage fluctuation overrun moment and the environmental factors of the previous time period are obtained.
Through the change on the time quantum, can judge through the continuity and screen the control object, remove noise interference.
S302: and comparing the environmental factors and the output data in the historical database to obtain the output curves of all the distributed power stations in the previous time period and the current time period.
The output power of the distributed power supply is influenced by factors such as external environment and the like to generate continuous fluctuation, and the output condition of the new energy power supply station can be deduced according to different environmental factors and corresponding processing of the same environmental factors in historical data.
S303: and acquiring voltage fluctuation data of the source end and the tail end of the line in the current time period and the last time period.
S304: aligning the output curve and the voltage fluctuation in time, matching the output-voltage fluctuation curves of the source end and the tail end of the line, and determining the corresponding distributed power station or the distributed power station combination to be controlled at the moment when the voltage fluctuation exceeds the limit.
Judging whether output-voltage fluctuation curves of a line source end and a line tail end of a single distributed power station match output curve changes and voltage fluctuation changes at the moment that the voltage fluctuation exceeds the limit; if so, the distributed power supply station is the distributed power supply station needing to be controlled; otherwise, the next judgment is carried out.
And splitting the voltage fluctuation, and matching the output combination of a plurality of distributed power supply stations at each moment through the output-voltage fluctuation curves of the line source end and the line tail end according to the output curves.
And (4) continuously judging the output combination of the distributed power supply stations, and screening the output combination of the distributed power supply stations at the moment when the voltage fluctuation exceeds the limit.
Judging whether all the distributed power supply stations in the combination exist in the output combination of the distributed power supply stations at the previous moment; if yes, reserving; otherwise, the screen is removed.
Selecting a power output combination of the distributed power supply stations at the moment when the voltage fluctuation exceeds the limit, and comparing the sum of distances from grid-connected positions of the distributed power supply stations to a line source end; and selecting a group of distributed power supply stations with the minimum distance sum as the distributed power supply stations needing to be controlled.
S4: and sequentially carrying out two-stage regulation and control of execution level regulation and control in the power station and coordination level regulation and control in the distribution network.
S401: regulating and controlling through an executive device in a distributed power station to be controlled; the internal actuators include a capacitor bank and transformer taps.
When the distribution network is in a small load, the adjustment and control are carried out only by increasing the adjustable range of the tap joint of the transformer;
when the distribution network is under a large load, the capacity of the capacitor single group, the number of the capacitor groups and the adjustable range of the tap joint of the transformer are increased simultaneously for regulation and control.
S402: calculating voltage fluctuation of a line source end and a line tail end after execution level regulation in the power station, judging whether the voltage meets regulation requirements, and if not, executing coordination level regulation in the power grid; if yes, the process proceeds to step S5.
S403: and sequentially judging the influence level of the distributed power supply stations at all grid-connected positions on the voltage from the source end of the line to the tail end of the line, and regulating and controlling the reactive power of the distributed power supply stations when the influence level exceeds an influence threshold value.
The calculation process of the influence level of the distributed power supply station on the voltage is as follows:
taking the grid-connected position of the distributed power supply station as a coefficient, and multiplying the coefficient by the voltage fluctuation of the corresponding line source end to obtain the influence level of the distributed power supply station on the voltage;
d is the influence level of the distributed power supply station on the voltage;
l is the distance from the grid-connected position of the distributed power station to the source end of the line;
and W is the source voltage fluctuation corresponding to the distributed power supply station in the time period of voltage fluctuation overrun.
The reactive power regulation formula is as follows:
minF＝|1-Uk|
the limiting conditions are as follows:
wherein N is the total number of nodes;
i. j is any node;
k is a node corresponding to the grid-connected point;
Ukis the grid connection point voltage amplitude;
PGiis the active power at node i;
QGiis the reactive power at node i;
QGiminis the lower reactive power limit at node i;
QGimaxis the upper reactive power limit at node i;
PLiis the active load at node i;
QLiis the reactive load at node i;
Viis the voltage at node i;
Vminis the lower voltage limit at node i;
Vmaxis the upper voltage limit at node i;
Qkthe reactive compensation value is the reactive compensation value of the grid connection point;
Qkminthe lower limit of the reactive compensation value of the grid connection point is set;
Qkmaxthe upper limit of the reactive compensation value of the grid connection point is set;
Gijis the conductance between nodes j, j;
Bijis the susceptance between nodes j, j.
S404: judging whether the regulated voltage meets the regulation requirement, if so, entering a step S5; if not, returning to the step S403 to perform the judgment and regulation of the next distributed power supply station.
S5: the process returns to step S2 to be executed in a loop.
It should be understood that the examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and such equivalents may fall within the scope of the present invention as defined in the appended claims.
Claims (10)
1. A cooperative control method for fusion perception of a line source end and a line tail end is characterized by comprising the following steps:
s1: respectively establishing output-voltage fluctuation curves of a line source end and a line tail end of each distributed power supply station;
s2: acquiring voltage values of a source end and a tail end of a line in real time, respectively calculating voltage fluctuation of the line, and searching a control object when the voltage fluctuation exceeds a limit;
s3: acquiring environmental factors in a period of time before the voltage fluctuation exceeds the limit, respectively calculating the output change of each distributed power supply station, and determining the distributed power supply station to be controlled by matching the output change of the corresponding period of time with the voltage fluctuation change;
s4: sequentially carrying out two-stage regulation and control of execution level regulation and control in a power station and coordination level regulation and control in a distribution network;
s5: the process returns to step S2 to be executed in a loop.
2. The cooperative control method based on line source-end fusion sensing of claim 1, wherein the output-voltage fluctuation curve obtained at the line source end and the output-voltage fluctuation curve at the line end are respectively established for the distributed power supply stations of the same grid-connected position and the same type under the condition that reactive power compensation is 0.
3. The cooperative control method of line source and tail end fusion sensing according to claim 1 or 2, wherein the distributed power supply station establishes the output-voltage fluctuation curves of the line source and the line tail end under the maximum load and the output-voltage fluctuation curves of the line source and the line tail end under the minimum load, respectively.
4. The cooperative control method for line source and tail end fusion sensing according to claim 1, wherein the step S3 specifically includes the following steps:
s301: dividing a natural day into a plurality of time periods, and acquiring the time period of the voltage fluctuation overrun moment and the environmental factors of the previous time period;
s302: comparing environmental factors and output data in a historical database to obtain output curves of all distributed power stations in the previous time period and the current time period;
s303: acquiring voltage fluctuation data of a source end and a tail end of a line in a current time period and a last time period;
s304: aligning the output curve and the voltage fluctuation in time, matching the output-voltage fluctuation curves of the source end and the tail end of the line, and determining the corresponding distributed power station or the distributed power station combination to be controlled at the moment when the voltage fluctuation exceeds the limit.
5. The cooperative control method of line source end and tail end fusion sensing according to claim 1, 2 or 4, characterized by determining whether there is output-voltage fluctuation curve matching output curve variation and voltage fluctuation variation of line source end and line tail end of a single distributed power station at the time of voltage fluctuation overrun; if so, the distributed power supply station is the distributed power supply station needing to be controlled; otherwise, carrying out the next judgment;
splitting voltage fluctuation, and matching the output combination of a plurality of distributed power supply stations at each moment through the output-voltage fluctuation curves of the line source end and the line tail end according to the output curves;
selecting a power output combination of the distributed power supply stations at the moment when the voltage fluctuation exceeds the limit, and comparing the sum of distances from grid-connected positions of the distributed power supply stations to a line source end; and selecting a group of distributed power supply stations with the minimum distance sum as the distributed power supply stations needing to be controlled.
6. The cooperative control method of line source end and tail end fusion sensing according to claim 5, wherein the output combination of the distributed power supply stations is continuously judged, and the output combination of the distributed power supply stations at the moment when the voltage fluctuation exceeds the limit is screened; judging whether all the distributed power supply stations in the combination exist in the output combination of the distributed power supply stations at the previous moment; if yes, reserving; otherwise, the screen is removed.
7. The cooperative line-source-end fusion-aware control method according to claim 1, wherein the step S4 includes the following steps:
s401: regulating and controlling through an executive device in a distributed power station to be controlled; the internal execution device comprises a capacitor bank and a transformer tap;
s402: calculating voltage fluctuation of a line source end and a line tail end after execution level regulation in the power station, judging whether the voltage meets regulation requirements, and if not, executing coordination level regulation in the power grid; if yes, go to step S5;
s403: sequentially judging the influence level of the distributed power supply stations at all grid-connected positions on the voltage from the source end of the line to the tail end of the line, and regulating and controlling the reactive power of the distributed power supply stations when the influence level exceeds an influence threshold;
s404: judging whether the regulated voltage meets the regulation requirement, if so, entering a step S5; if not, returning to the step S403 to perform the judgment and regulation of the next distributed power supply station.
8. The cooperative control method for fusion sensing of the source end and the tail end of the line according to claim 1 or 7, wherein when the distribution network is under a small load, the control is performed only by increasing the adjustable range of the tap of the transformer;
when the distribution network is under a large load, the capacity of the capacitor single group, the number of the capacitor groups and the adjustable range of the tap joint of the transformer are increased simultaneously for regulation and control.
9. The cooperative control method based on line source-end fusion sensing of claim 7, wherein the calculation process of the influence level of the distributed power supply station on the voltage is as follows:
taking the grid-connected position of the distributed power supply station as a coefficient, and multiplying the coefficient by the voltage fluctuation of the corresponding line source end to obtain the influence level of the distributed power supply station on the voltage;
d is the influence level of the distributed power supply station on the voltage;
l is the distance from the grid-connected position of the distributed power station to the source end of the line;
and W is the source voltage fluctuation corresponding to the distributed power supply station in the time period of voltage fluctuation overrun.
10. A cooperative control method with line source-end fusion sensing according to claim 1, 2, 4, 6, 7 or 9, wherein said distributed power stations include but are not limited to photovoltaic power stations, wind power stations and hydropower stations; environmental factors include temperature, wind, light intensity and rainfall.
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