CN213213111U - Automatic power generation control system - Google Patents
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Abstract
The utility model discloses an automatic power generation control system. Wherein, this system includes: the thermal power generating unit and the new energy station are positioned in the constructed target control area; and the control master station, the thermal power generating unit and the new energy station are used for carrying out automatic power generation control on the thermal power generating unit based on the first planned output power and the first actual output power of the thermal power generating unit and the second planned output power and the second actual output power of the new energy station. The utility model provides an among the correlation technique from the relatively poor technical problem of gain control system to special high voltage direct current transmission ability.
Description
Technical Field
The utility model relates to a power grid control field particularly, relates to an automatic power generation control system.
Background
The control function of the current self-gain control master station meets the control requirements of conventional units of fire and hydropower stations, and can realize the unified coordination control of various safe units.
However, the transmission capacity of the extra-high voltage direct current channel is increased, so that the direct current fed into the receiving end power grid presents the characteristics of increased direct current receiving ratio and reduced system rotation inertia, and the power grid regulation capacity is reduced. Moreover, the problem of stable frequency of a receiving-end power grid is caused by high-power shortage caused by permanent faults such as direct-current blocking and the like, the maximum steady-state power transmission capacity of an alternating-current and direct-current power transmission project is directly limited, and the delivery capacity of new energy power generation is influenced.
In view of the above problems, no effective solution has been proposed.
SUMMERY OF THE UTILITY MODEL
An embodiment of the utility model provides an automatic power generation control system to solve at least in the correlation technique from the relatively poor technical problem of gain control system to special high voltage direct current transmission ability.
According to an aspect of the embodiments of the present invention, there is provided an automatic power generation control system, including: the thermal power generating unit and the new energy station are positioned in the constructed target control area; and the control master station, the thermal power generating unit and the new energy station are used for carrying out automatic power generation control on the thermal power generating unit based on the first planned output power and the first actual output power of the thermal power generating unit and the second planned output power and the second actual output power of the new energy station.
Optionally, the system further comprises: direct current corresponding to the target control area; and the control master station is connected with the direct current and used for generating a first planned output power and a second planned output power based on the direct current power transmission plan, the short-term power prediction data and the ultra-short-term power prediction data.
Optionally, the controlling master station comprises: a processor for determining a zone control deviation based on the first planned output power, the first actual output power, the second planned output power, and the second actual output power; the comparison circuit is connected with the processor and used for obtaining a comparison result of the joint-variation transmission power and the first preset limit; and the controller is connected with the processor, the comparison circuit and the thermal power generating unit and is used for carrying out automatic power generation control on the thermal power generating unit based on the regional control deviation and the comparison result.
Optionally, the system further comprises: the first filter circuit is connected with the processor and is used for carrying out data filtering and dynamic dead zone filtering on the regional control deviation; and the controller is connected with the first filter circuit and is used for carrying out automatic power generation control on the thermal power generating unit based on the filtered region control deviation and the comparison result.
Optionally, the system further comprises: a second filter circuit for first-order filtering the first planned output power and the first actual output power; a third filter circuit for performing median filtering on the second planned output power and the second actual output power; and the processor is connected with the second filter circuit and the third filter circuit and is used for determining the area control deviation based on the filtered first planned output power, the filtered first actual output power, the filtered second planned output power and the filtered second actual output power.
Optionally, the system further comprises: the first trading system is used for storing trading power of each new energy station within a preset time period; the first verification device is connected with the first transaction system and used for comparing the total transaction electric power of the target section in a preset time period with a second preset limit to obtain a first verification result of the target section, wherein the new energy station is located below the target section, and the total transaction electric power is the sum of the transaction electric powers of all stations below the target section in the preset time period; and the control master station is connected with the first checking device and used for sending the target output power determined based on the first checking node to the new energy station.
Optionally, the system further comprises: a second transaction system for storing the in-stock power at each new energy station; the second checking device is connected with the second transaction system and used for comparing the total spot power of the target section with a third preset limit to obtain a second checking result of the target section, wherein the total spot power is the sum of the spot power of all stations under the target section; and the control master station is connected with the second check device and used for determining the target output power based on the second check result.
Optionally, the system further comprises: the energy storage power station corresponds to the new energy station; and the control master station is connected with the energy storage power station and used for determining the charging power of the energy storage power station based on the limited power of the new energy station under the condition that the new energy station is determined to have the power limiting condition.
Optionally, the new energy station and the energy storage power station have a one-to-one relationship; or the new energy station and the energy storage power station have a many-to-one relationship.
Optionally, the system further comprises: the receiving device is connected with the power grid and used for receiving the up-regulation requirement of the power grid; and the control main station is connected with the receiving device and used for determining the discharge power of each energy storage power station in the plurality of energy storage power stations according to the received up-regulation requirement.
The embodiment of the utility model provides an in, after constructing the target control area, can carry out automatic power generation control to thermal power generating unit based on thermal power generating unit's first plan output and first actual output to and new forms of energy station's second plan output and second actual output, realize that the wind-solar-fire beats bundle coordinated control's purpose. Compared with the prior art, the control is carried out by adding the direct current virtual control area and taking the direct current channel safety as a target, the technical effects of improving the automation level of intelligent scheduling, improving the consumption capacity of new energy, reducing the overall power generation cost of a power grid, reducing the fluctuation of the power grid and improving the safety and stability of the power grid are achieved, and the technical problem that the self-gain control system in the prior art has poor capacity of ultra-high voltage direct current transmission is solved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without undue limitation to the invention. In the drawings:
fig. 1 is a schematic diagram of an automatic power generation control system according to an embodiment of the present invention;
fig. 2 is a schematic diagram of an alternative dc virtual control area according to an embodiment of the present invention;
FIG. 3 is a flow chart of an alternative automatic power generation control system according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of an alternative adjustment range for a planned bandwidth limit mode assembly, according to an embodiment of the present invention;
fig. 5 is a schematic diagram of post-filtering effects of an alternative different filtering algorithm according to an embodiment of the present invention;
fig. 6 is a schematic diagram of alternative links of long-term transaction in new energy according to an embodiment of the present invention;
fig. 7 is a flow diagram of an alternative transaction data rationality check according to an embodiment of the invention;
fig. 8 is a flow chart of alternative new energy spot transaction links according to an embodiment of the present invention;
FIG. 9 is a flow chart of an alternative energy storage power station charging strategy according to an embodiment of the present invention;
FIG. 10 is a flow chart of an alternative energy storage power plant discharge strategy in accordance with an embodiment of the present invention;
fig. 11 is a flow chart of an alternative thermal power depth peaking strategy according to an embodiment of the present invention.
Detailed Description
In order to make the technical solution of the present invention better understood, the technical solution of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts shall belong to the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises" and "comprising," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a product or device that comprises a list of elements is not necessarily limited to those elements explicitly listed, but may include other elements not expressly listed or inherent to such product or device.
Example 1
According to the embodiment of the utility model, an automatic power generation control system is provided.
Fig. 1 is a schematic diagram of an automatic power generation control system according to an embodiment of the present invention, as shown in fig. 1, the system includes:
the thermal power generating unit 12 and the new energy station 14 are located in the constructed target control area 10.
The thermal power generating unit can be a thermal power generating unit, and the new energy station can comprise: wind generating sets and photovoltaic generating sets, but are not limited thereto.
And the control main station 16, the thermal power generating unit and the new energy station, is used for performing automatic power generation control on the thermal power generating unit based on the first planned output power and the first actual output power of the thermal power generating unit and the second planned output power and the second actual output power of the new energy station.
The control master station can be a new energy AGC master station.
In an optional embodiment, an independent virtual control area, namely the target control area, can be established by the direct-current matched fire and the matched new energy according to the actual requirement of bundling and delivering the direct-current wind-solar fire, and the control function of the direct-current virtual control area is added. The day-to-day rolling power generation plan of the thermal power generating unit and the new energy station can be determined based on the power generation plan model, the wind-solar-fire bundling coordination control is realized based on the power generation plan and the actual output power, and the safe and stable operation of direct current is ensured.
Through the utility model discloses above-mentioned embodiment, after constructing the target control area, can carry out automatic power generation control to thermal power generating unit based on thermal power generating unit's first plan output and first actual output to and the second plan output and the actual output of second of new forms of energy station, realize the wind and light fire and beat the purpose of bundling coordinated control. Compared with the prior art, the control is carried out by adding the direct current virtual control area and taking the direct current channel safety as a target, the technical effects of improving the automation level of intelligent scheduling, improving the consumption capacity of new energy, reducing the overall power generation cost of a power grid, reducing the fluctuation of the power grid and improving the safety and stability of the power grid are achieved, and the technical problem that the self-gain control system in the prior art has poor capacity of ultra-high voltage direct current transmission is solved.
Optionally, in the above embodiment of the present invention, the system further includes: direct current corresponding to the target control area; and the control master station is connected with the direct current and used for generating a first planned output power and a second planned output power based on the direct current power transmission plan, the short-term power prediction data and the ultra-short-term power prediction data.
In an alternative embodiment, as shown in fig. 2 and 3, a power generation planning mode obtains a thermal power generating unit day-ahead plan (i.e., the preset output power) according to a direct-current power delivery plan and a matched wind-solar short-term power preset data, and then forms an in-day rolling plan (i.e., the first planned output power and the second planned output power) of the thermal power generating unit and the new energy field station according to the ultra-short-term power prediction data and the thermal power generating unit day-ahead plan. And the AGC (Automatic Generation Control) calls the thermal power generating unit to eliminate the power deviation of the new energy station according to the day-to-day rolling plan of the thermal power generating unit and the new energy station and the actual power output of the new energy station, and finally realizes the wind-light-fire bundling coordination Control based on the day-to-day and day-to-day rolling power Generation plan and the multi-time scale coordination of the AGC and the time sequence progression.
Optionally, in the above embodiments of the present invention, the control master station is further configured to: determining a regional control deviation based on the first planned output power, the first actual output power, the second planned output power, and the second actual output power; obtaining a comparison result of the joint-variation transmission power and a first preset limit; and performing automatic power generation control on the thermal power generating unit based on the regional control deviation and the comparison result.
It should be noted that, according to the grid structure characteristics of the dc virtual control area, from the grid tide current flowing direction, after the dc delivery plan is determined, the sum of the combined-transformer downward-transmission tide current and the total output power of the matched thermal power generating units is fixed, so that it can be ensured that the combined-transformer downward-transmission tide current of the converter station does not exceed the stable limit only by limiting the total output power of the matched thermal power generating units.
In an optional embodiment, the control target of the direct current virtual control area is to counteract the fluctuation of the power output of the matched wind power base by adjusting the power output of the thermal power generating unit, so as to ensure the safety and stability of the direct current outgoing channel. Therefore, the direct-current virtual control area can realize the function of bundling and delivering the wind-solar fire by using area deviation control and safety constraint control, wherein the area deviation control mode can adopt a fixed-tie-line power mode (FTC), and the area control deviation of the control area under the mode can be determined by actual output power and planned output power; the safety constraint control strategy may be determined using a comparison of the co-varying transmit power and the stability limit.
Optionally, the controlling master station comprises: a processor for determining a zone control deviation based on the first planned output power, the first actual output power, the second planned output power, and the second actual output power; the comparison circuit is connected with the processor and used for obtaining a comparison result of the joint-variation transmission power and the first preset limit; and the controller is connected with the processor, the comparison circuit and the thermal power generating unit and is used for carrying out automatic power generation control on the thermal power generating unit based on the regional control deviation and the comparison result.
In an alternative embodiment, the fourth actual output power may be calculated according to the above division of the dc virtual control area boundary by using the following formula:
Ireal＝∑PGi+PDC+∑Pi-wind，
wherein, PGiIs the first actual output power, P, of the thermal power generating unitDCThird actual output power, P, for the target DCi-windA second actual output power for the new energy station;
the fourth planned output power may be calculated using the following equation:
Ischedule＝∑IGi-schedule+IDC-schedule+∑Ii-wind-schedule，
wherein, IGi-scheduleFor a first planned output power, I, of a thermal power unitDC-scheduleThird designed output Power for target direct Current, Iwind-scheduleA second planned output power for the new energy station;
the area control deviation ACE may be calculated using the following formulatz：
ACEtz＝Ireal-Ischedule＝∑PGi+PDC+∑Pi-wind-∑IGi-schedule-IDC-schedule-∑Ii-wind-schedule
＝∑PGi-∑IGi-schedule+PDC-IDC-schedule+∑Pi-wind-∑Ii-wind-schedule。
Optionally, in the above embodiments of the present invention, the controller is further configured to: determining an allocation strategy of the regional control deviation based on the comparison result; distributing the area control deviation based on a distribution strategy, and determining a first regulating quantity; and adjusting the actual output power of the thermal power generating unit based on the first adjusting quantity.
Optionally, based on the comparison result, the controller is further configured to: determining that the allocation strategy is a first allocation strategy under the condition that the comparison result is that the joint variation transmission power is smaller than a first preset limit; determining that the distribution strategy is a second distribution strategy under the condition that the comparison result is that the difference value between the joint variable transmission power and the first preset limit is located in a preset area, wherein the first regulating quantity is used for controlling the actual output power of the thermal power generating unit to increase; and determining that the allocation strategy is a third allocation strategy when the comparison result is that the joint variable transmission power is greater than the difference value of the first preset limit.
The first preset limit may be a rated limit corresponding to the joint variable transmission power, and may be determined according to actual needs. The first distribution strategy may be a strategy of adjusting a first actual output strategy of the matched thermal power generating unit to track fluctuations in output power of the new energy station. The second allocation strategy may be a strategy that prohibits the thermal power unit from decreasing the output power, but increases the output power. The third allocation policy may be an actual throttling rate prioritization policy.
In an optional embodiment, when the combined variable transmission power is smaller than the stable limit, the fluctuation of the second actual output power of the new energy station is tracked by adjusting the first actual output power of the matched thermal power generating unit; when the joint-variation transmission power approaches the stable limit, forbidding the matched thermal power generating unit to further reduce the first actual output power, but increasing the power direction allowance; when the combined variable transmission power exceeds the stable limit, the regional control deviation of the virtual control area is the more limited combined variable transmission power, the distribution strategy of the control deviation can adopt a priority strategy according to the actual regulation rate, the output power of the thermal power unit is increased as soon as possible, the stable out-of-limit is eliminated, and the safe operation of the combined variable is ensured.
Optionally, in the above embodiments of the present invention, the control master station is further configured to: determining an adjusting range of the thermal power generating unit based on the first planned output power; judging whether the first regulating quantity is within a regulating range; if the first regulating quantity is within the regulating range, regulating the actual output power of the thermal power generating unit based on the first regulating quantity; and if the first regulating quantity is not in the regulating range, determining a second regulating quantity in the regulating range based on the first regulating quantity, and regulating the actual output power of the thermal power generating unit based on the second regulating quantity.
It should be noted that, for the automatic power control of the thermal power generating unit, the conventional AGC provides a plurality of manual and automatic control modes, and can be adapted to different control requirements and application occasions. As mentioned above, the overall control concept of the DC virtual control area is from prediction to planning and finally to real-time control based on the planning. When the conventional automatic mode is adopted, the control target of the unit is irrelevant to the power generation plan, and the unit is adjusted within the rated adjustment range of the unit according to the borne adjustment power. After a period of operation, the actual output power of the unit may deviate from the power generation schedule. If a planning mode is adopted to control the unit, the unit deviates from the plan when the whole network ACE needs to be adjusted, and returns to the plan value again when no adjustment is needed, so that the unit can be adjusted back and forth, and if a plurality of units return to the plan value simultaneously, new impact can be generated on a control area.
In an alternative embodiment, the control mode of the thermal power generating unit in the direct-current virtual control area is preferably a planned bandwidth mode, which is a special automatic control mode, in which the control target of the unit is still the regional control deviation, but the adjusting range of the unit is dynamically changed and is different from the adjusting range of the conventional automatic control mode, namely the rated adjusting range of the unit. The adjustment range of the planned bandwidth mode is based on the power generation plan of the unit, a certain bandwidth is expanded up and down, the bandwidth can be expanded according to needs, the planned value forms a planned value adjustment band in cooperation with the bandwidth to serve as a real-time adjustment range of the planned bandwidth mode unit, therefore, the adjustment range of the unit in the planned bandwidth mode changes along with changes of the plan, as shown in fig. 4, wherein a middle broken line represents a planned value 0, an upper broken line represents an adjustment upper limit 1, a lower broken line represents an adjustment lower limit 2, and a distance between the two broken lines represents a bandwidth 3. Under normal conditions, the unit can only be adjusted up and down within the range of the planned value adjusting band, and the unit can adjust the regional control deviation without deviating too far from the planned value through adjustment in the adjusting band. And when the planned value of the unit is invalid, restoring the inherent adjusting range of the unit.
The adjustment band generation system is as follows: suppose the power generation plan is PbThe upper limit of the set adjustment is PmaxThe lower regulation limit of the unit is PminThe bandwidth is w and the upper limit of the adjustment band is BmaxThe lower limit of the adjusting belt is Bmin. Wherein, the adjusting belt boundary is:
Bmax＝Pb+w，
Bmin＝Pb-w，
meanwhile, the correction is carried out according to the following conditions:
when P is presentb+w＞Pmax，Bmax＝Pmax，
When P is presentb-w＜Pmin，Bmin＝Pmin，
By calculating the adjustment range of the crew by the system described above, the crew can be adjusted freely within this adjustment range without returning to the planned value after adjusting the ACE.
Optionally, in the above embodiment of the present invention, the system further includes: the first filter circuit is connected with the processor and is used for carrying out data filtering and dynamic dead zone filtering on the regional control deviation; and the controller is connected with the first filter circuit and is used for carrying out automatic power generation control on the thermal power generating unit based on the filtered region control deviation and the comparison result.
In an optional embodiment, as shown in fig. 3, the dc control area AGC periodically obtains the total power of the thermal power generating units and the new energy station and the actual power of the dc output link, and according to different output power characteristics, different filtering strategies may be adopted, where data filtering (ACE filtering shown in fig. 3) and dynamic dead-zone filtering are performed on the area control deviation to obtain a final control adjustment quantity, and the adjustment quantity is subjected to a distribution strategy to obtain a control target (unit target output power shown in fig. 3) of each thermal power generating unit, and the control target is sent to the thermal power plant to be controlled.
Optionally, in the above embodiment of the present invention, the system further includes: a second filter circuit for first-order filtering the first planned output power and the first actual output power; a third filter circuit for performing median filtering on the second planned output power and the second actual output power; and the processor is connected with the second filter circuit and the third filter circuit and is used for determining the area control deviation based on the filtered first planned output power, the filtered first actual output power, the filtered second planned output power and the filtered second actual output power.
In an alternative embodiment, as shown in fig. 3, the dc measurement is generally considered to be stable, and may not employ a filtering method (such as the measurement data filtering shown in fig. 3); the output power fluctuation of the thermal power generating unit is small, and the control requirement can be met by adopting a first-order filtering mode; the output power fluctuation of the new energy station is large, a median filtering mode can be adopted, the filtering depth is deep, and high-frequency components are filtered. And subtracting the corresponding power generation plan from the filtered value to obtain the regional control deviation of the virtual control area.
It should be noted that, because the adjustment rate of the thermal power generating unit is relatively slow, in order to avoid the frequent repeated adjustment of the thermal power caused by the random fluctuation of the new energy power, the measurement data and the regional control deviation of the new energy station need to be filtered, and the filtering mode mainly includes: the user can select the filtering depth according to the requirement, and the filtering effect is changed according to the difference of the filtering depth. The higher the filtering depth, the better the filtering effect. However, an increase in the filtering depth causes an increase in the filtering delay. Conventional digital filtering approaches include: first order filtering, second order filter filtering, and median filtering.
The first-order low-pass filtering algorithm is generally expressed by a first-order linear differential equation:
XFIL(K+1)＝XFIL(K)+[XRAW(K+1)-XFIL(K)]*DTF，
the transfer function of a second order low pass filter is defined as:
median filtering is a non-linear smoothing technique, and the basic principle is to replace the value of a point in a digital sequence with the median of the values of the points in a neighborhood of the point, so that the surrounding values are close to the true values, thereby eliminating isolated noise points.
Based on the scheme, for the regional control deviation of the power grid, different filtering algorithms can be adopted for filtering, and the effect after filtering is shown in fig. 5.
Optionally, in the above embodiment of the present invention, the system further includes: the first trading system is used for storing trading power of each new energy station within a preset time period; the first verification device is connected with the first transaction system and used for comparing the total transaction electric power of the target section in a preset time period with a second preset limit to obtain a first verification result of the target section, wherein the new energy station is located below the target section, and the total transaction electric power is the sum of the transaction electric powers of all stations below the target section in the preset time period; and the control master station is connected with the first checking device and used for sending the target output power determined based on the first checking node to the new energy station.
The preset time period may be a medium-long time period, and may be determined according to actual needs. The second preset limit may be a section rated limit set in medium and long term transactions, and may be determined according to actual needs.
In an optional embodiment, the new energy AGC automatically receives medium and long term transaction electric power, on the premise of ensuring the safety of all levels of nested sections, the accurate execution of medium and long term transaction is preferentially ensured, and the fair distribution of the residual consumption space in all power plants is realized. After the targets of all the stations are calculated, a reasonable command is formed through a series of checks such as step length check, section safety check and the like, and all the new energy stations are issued to execute the command. As shown in fig. 6, the middle-term and long-term transaction of new energy includes links such as transaction preprocessing, nested profile control, and security lockout verification.
And after the new energy AGC receives the planned trading power, the medium-long term trading execution is preferentially ensured under the condition of section safety, and if the section is out of limit due to the trading, the actual trading power of each station is scaled according to the trading power proportion. As shown in fig. 7, the medium-and-long-term trading power of each station can be obtained in real time from the trading module, the medium-and-long-term total trading power of the relevant station under the target cross section is calculated, and whether the cross section is out of limit is determined, that is, whether the medium-and-long-term total trading power exceeds a second preset limit is determined, so as to obtain a first verification result. And further determining medium and long term transaction power (namely the target output power) of each station based on the first check result, and further controlling the output power of each station based on the medium and long term transaction power.
Optionally, in the above embodiments of the present invention, the control master station is further configured to: under the condition that the first check result is that the total transaction electric power exceeds a second preset limit, the transaction electric power of the new energy station is adjusted downwards to obtain target output power; and under the condition that the first verification result is that the total transaction power does not exceed the second preset limit, obtaining a difference value between the total output power of the target section and the total transaction power, processing the difference value according to a first preset proportion to obtain target power corresponding to the new energy station, and obtaining the target output power based on the target power.
In an alternative embodiment, as shown in fig. 7, to avoid the cross section exceeding caused by excessive transaction power, the AGC may perform security check on transaction data, check whether the new energy station transaction power under each cross section may cause the cross section exceeding, and if there is an exceeding risk, perform proportional reduction on the transaction power according to the cross section acceptance capability, thereby ensuring the cross section security and the fairness of transaction execution. If the cross section out-of-limit risk does not exist in the trading power, when the cross section distributes power, the total target power (namely the total output power) of the cross section is subtracted by the total trading power (namely the total trading power) of the field station under the cross section, then the remaining indexes are proportionally distributed to all the field stations (including the field station with the trading power) participating in cross section regulation, after distribution, the target output power can be obtained, and the field station is guaranteed to be preferentially distributed to the trading power when the cross section distributes power.
Optionally, in the above embodiments of the present invention, the control master station is further configured to: judging whether the new energy station is a target station or not; if the new energy station is the target station, determining that the target output power is the sum of the transaction power and the target power of the new energy station; and if the new energy station is not the target station, determining the target output power as the target power.
The target station may refer to a station participating in a transaction, that is, a station having power for transaction.
In an optional real-time mode, after distribution is completed, the target output power of the station without the trading power is a target value, and the target output power of the station with the trading power is the target value and then the trading power is superposed.
Optionally, in the above embodiments of the present invention, the control master station is further configured to: determining the current state of the target section; under the condition that the current state is normal, sending target output power or first output power to the new energy station, wherein the first output power is larger than the target output power; under the condition that the current state is jumping, target output power is sent to the new energy station; under the condition that the current state is suspended, the target output power is forbidden to be sent to the new energy station; and under the condition that the current state is emergency, if the target output power is greater than the product of the second actual output power of the new energy station and a preset value, sending the sum of the second actual output power and the product to the new energy station, wherein under the condition that the current state is still emergency in the next control period, sending the minimum output power of the target output power and the second actual output power to the new energy station.
The preset value may be a preset fixed step, for example, 1/4 steps, but is not limited thereto.
In an alternative embodiment, as shown in fig. 6, for the safety lockout control link, considering the lag and precision of the execution of the command by each station under the section, which results in the phenomenon of undershooting or overshooting, a last safety lockout defense line needs to be set before the command exit.
If the current state of the cross section is normal, namely the cross section is in a normal area and a help area, the sufficient space of the cross section is considered, and the situation that the instruction for reducing the output power does not occur in each station is ensured, so that the target output power can be sent to the new energy station, the output power of each station is kept unchanged at the moment, the first output power can also be sent to the new energy station, and the output power of each station is increased at the moment;
if the current state of the section is jumping, namely the section jumps, all the real-time power stations issue current output power instructions, so that the target output power is sent to the new energy station;
if the current state of the section is pause, namely the section is paused, all stations do not send instructions, so that the target output power is forbidden to be sent to the new energy station;
if the current state of the section is urgent, that is, the section is beyond the urgent adjustment limit, whether the target output power is higher than the second actual output power is judged, and considering that the general output power of each station is lower than the command problem, in order to avoid overshoot, in the current control period, if the target output power is higher than 1/4 steps of the second actual output power, the command is issued according to the second actual output power with the second actual output power of +1/4 steps (the target output power is not issued, large-scale down regulation of the stations is avoided, and finally waveform oscillation of the section power occurs), and in the next control period, if the section is still above the urgent limit, the command value takes the smaller value of the target output power and the second actual output power, so that the section is quickly recovered.
Optionally, in the above embodiment of the present invention, the system further includes: a second transaction system for storing the in-stock power at each new energy station; the second checking device is connected with the second transaction system and used for comparing the total spot power of the target section with a third preset limit to obtain a second checking result of the target section, wherein the total spot power is the sum of the spot power of all stations under the target section; and the control master station is connected with the second check device and used for determining the target output power based on the second check result.
The third preset limit may be a section rated limit set in spot transaction, and may be determined according to actual needs.
The new energy AGC automatically receives spot electric power of each station made by the spot market in the day before and in the day, the two are superposed to be used as total spot, the spot part is divided in advance during section distribution, and the completion of the spot electric power and the fair distribution of each station are realized while the safety of the sections is ensured. Meanwhile, the new energy AGC module receives a reward and punishment coefficient (the calculation rule of the coefficient is formulated by a plan) file from the spot transaction module in real time, the file is automatically analyzed and warehoused, the AGC guides the distribution of the whole network new energy power based on the reward and punishment coefficient of each station, the distribution of the whole network new energy power is carried out according to the reward and punishment coefficient and the maximum capacity (the maximum capacity is between 0 and installed capacity), and the smooth execution of the spot transaction is guaranteed.
And when the AGC carries out power distribution on the new energy station, the power target value of the new energy station participating in the transactions of replacement transaction, cross-provincial transaction, direct electricity purchase and the like of the self-contained power plant needs to be preferentially distributed.
In an alternative embodiment, as shown in fig. 8, if the medium-and-long-term transaction power does not result in a korean cross section, the real-time spot power of each station is obtained from the transaction module in real time, the real-time total spot power of the relevant stations under the target cross section is calculated, and whether the real-time total spot power causes cross-section crossing is determined, that is, the total spot power and the third preset limit are determined, so as to obtain a second check result. And further determining target output power in each station based on the second check result, and further controlling the output power of each station based on the medium and long term transaction power.
Optionally, in the above embodiments of the present invention, the control master station is further configured to: under the condition that the total spot power exceeds a third preset limit as a second check result, the spot power of the new energy station is adjusted downwards to obtain target output power; and under the condition that the total spot power does not exceed a third preset limit as a second check result, acquiring a difference value between the total output power of the target section and the total spot power, processing the difference value according to a second preset proportion to obtain apportioned power corresponding to the new energy station, and obtaining the target output power based on the apportioned power.
The second predetermined ratio may be a coefficient ratio, but is not limited thereto and may be determined according to real-time requirements.
In an alternative embodiment, as shown in fig. 8, in the case that the total spot power exceeds the third preset limit, it is determined that the total spot power causes the cross-section to be out of limit, and the real-time spot power of each station may be proportionally reduced according to the cross-section receiving capacity, so as to ensure the safety of the cross-section. In the case where the total spot power does not exceed the third preset limit, a cross section remaining space after the execution of the transaction may be calculated, wherein the cross section remaining space includes: and (4) total target power-total spot power, and distributing the residual space to all stations according to the coefficient proportion to obtain apportioned power. A target output power is further derived based on the split power.
Optionally, in the above embodiments of the present invention, the control master station is further configured to: judging whether the new energy station is a target station or not; if the new energy station is a target station, determining the target output power as the sum of the transaction power, the spot power and the shared power of the new energy station in a preset time period; and if the new energy station is not the target station, determining the target output power as the allocated power.
The target station may be a station participating in a power transaction.
In an alternative embodiment, as shown in fig. 8, for the stations participating in the transaction, the target output power is medium and long term transaction power + real-time spot power + profile split power; for stations not participating in the transaction, the target output power is the section split power.
Optionally, in the above embodiment of the present invention, the system further includes: the energy storage power station corresponds to the new energy station; and the control master station is connected with the energy storage power station and used for determining the charging power of the energy storage power station based on the limited power of the new energy station under the condition that the new energy station is determined to have the power limiting condition.
In an alternative embodiment, for the charging strategy, as shown in fig. 9, an energy storage charging period (the starting and ending time of the period can be modified and can also be received from another module) can be set, the starting of the energy storage charging is controlled by the AGC, the charging process can be interrupted, and the charging can be performed in a plurality of periods from the beginning of the charging to the full charging. And automatically counting the increased power generation quantity of the new energy power station participating in the auxiliary market.
The specific control strategy comprises the following main processes: the auxiliary market ranks and matches the new energy power stations participating in the energy storage auxiliary market in the previous day according to the bidding of the new energy power stations, and transmits the pairing relation between the new energy power stations and the energy storage power stations to AGC; the AGC scans whether a power station is power-limited or not in real time according to the pairing relation of the new energy power station and the energy storage power station, if the power is limited, the limited power delta Gi of the power station is calculated, and if a plurality of new energy field stations correspond to the same energy storage power station, the total power-limited power delta G is accumulated; the charging power of the energy storage power plant may be determined based on the limited power Δ Gi or the total limited power Δ G.
Optionally, in the above embodiments of the present invention, the new energy station and the energy storage power station have a one-to-one relationship; or the new energy station and the energy storage power station have a many-to-one relationship.
In an alternative embodiment, as shown in fig. 9, when the new energy station and the energy storage power station are in a "1 to 1" mode, the charging power of the energy storage power station is equal to the electricity-limited power of the new energy station paired with the energy storage power station; under the mode of 'multiple pairs of 1', the new energy field station and the energy storage power station are distributed to each energy storage power station according to the capacity proportion of the new energy power station, and the fully charged energy storage power stations do not participate in calculation any more.
Optionally, in the above embodiment of the present invention, the control master station is further configured to adjust the charging power of the energy storage power station based on the adjustment rate of the new energy station.
In an alternative embodiment, as shown in fig. 9, in order to avoid the impact on the power grid caused by too fast change of the charging power of the energy storage power station, the charging power of the energy storage power station needs to be adjusted in real time according to the up-regulation rate of the new energy power station participating in the auxiliary market, so that the charging power of the energy storage power station is consistent with the generation increasing power of the corresponding new energy power station, and the smooth operation of the power grid is ensured.
Optionally, in the above embodiment of the present invention, the system further includes: the receiving device is connected with the power grid and used for receiving the up-regulation requirement of the power grid; and the control main station is connected with the receiving device and used for determining the discharge power of each energy storage power station in the plurality of energy storage power stations according to the received up-regulation requirement. The control master station is further configured to: if the maximum discharge power of the energy storage power stations does not meet the up-regulation requirement, acquiring the difference between the up-regulation requirement and the maximum discharge power to obtain a residual regulation requirement; and controlling the actual output power increase of the thermal power generating unit based on the residual regulation demand.
In an optional embodiment, for the discharging strategy, as shown in fig. 10, in the energy storage non-charging period, if an up-regulation demand occurs in the power grid, the energy storage is preferentially discharged, the power grid regulation demand is distributed according to the proportion of the rated discharge power of the energy storage power stations, and when the discharge power of all the energy storage power stations is regulated to the maximum and still cannot meet the power grid demand, the output power of the water turbine generator set is further adjusted up until the energy storage discharge is completed. When the power grid has no up-regulation demand, the energy storage power station keeps the current electric quantity unchanged, namely the charge-discharge power is 0.
Optionally, in the above embodiment of the present invention, the control master station is further configured to determine whether the load rates of the thermal power generating unit and the new energy station are within a preset load range; and if the load rate is within the preset load range, automatically controlling power generation of the thermal power generating unit according to a preset regulating quantity distribution mode.
The preset conforming range can be 50% -55%, and can be set according to actual conditions.
In an alternative embodiment, deep peaking may be enabled when the overall unit load factor is between 55% and 50%. The lower the subsidy quotation is, the higher the peak shaving priority is, the quotation sequence table is arranged into a quotation interval table, the power plants with the same quotation are in the same sequencing interval, and the lower the quotation interval is, the higher the priority is, the lower the peak shaving cost is guaranteed during adjustment. The method can adopt a quotation sequencing distribution or proportion distribution mode when the adjustment amount is distributed:
the quotation sequencing distribution mode is a mode of sequentially reducing the quotation sequence from the first position to the minimum output power;
the proportion distribution mode is a mode of distributing adjustment quantity to all the units by adopting various modes such as a price reporting ratio, a capacity ratio, a standby ratio and the like.
As shown in fig. 11, for the case of reducing the output power, the adjustment gear can be determined, and the unit price is generally 2, 50% -40% one, and 40% -minimum one. The auxiliary service quotation is set to have N gears in total, namely all the units are divided into N grades according to the quotation, the grade of each unit is Ri, and the following standby of each unit is calculated in sequence:
Edown，i＝Pi-Pmin，i，
accumulate the next backups for each gear:
Pdown，i＝∑Edown，i＝∑(Pi-Pmin，i)，
suppose the total regional adjustment requirement is Preg, total(assuming that the value is negative, adjust downward), sequentially adding up the total down reserve by gear until the following conditions are met:
∑Pdown，i≤Preg, total≤∑Pdown，i+1，
I is the adjustment gear.
Calculating a target value:
Pgen_des，j＝Pmin，j j≥i
Pgen_des，j＝Pmax，j j＞i’
therefore, the target value of the unit before the gear i is the lower limit, and the unit is not adjusted downwards after the gear i, so that deep adjustment compensation is not generated.
For the case of increasing output power, when the area is totally adjustedDemand for saving Preg, totalFor positive (regional upshifts), the upshifts (P) for each unit are likewise calculatedmax，i-Pi) And accumulating the upshifts of the quotation gears for standby according to the sequence of quotations from high to low, and further calculating the gear i.
And for the unit before the gear i, the target value is the upper limit of the current gear, and the unit target value after the gear i is the lower limit of the current gear.
For the applicable situation, the control strategy considers that all the units carry out sequencing and distribution at the same time, a fixed period issuing mode is proposed for thermal power, and all the units issue instructions at the same time, so that the fairness of distribution can be guaranteed.
It should be further noted that, for the external interface and the man-machine optimization of the AGC, for the input interface, the AGC obtains important data such as peak shaving auxiliary service quotation, medium and long term transaction power through a text interface form; important plan data such as a day-ahead plan and a day-in plan are obtained through a plan definition table; for the output interface, the AGC can provide assessment calculation data for the assessment statistical module; and important data such as issuing records, warning information and the like can be provided, and the system can be well matched with other modules in a linkage manner.
The actual grid structure of the power grid is combined, and the grid structure is displayed in a tree form, so that a dispatcher can quickly position a section and a new energy station, and the interaction efficiency is improved; providing more striking and rich alarm functions, and visually displaying the abnormal conditions of the area and the section, the unit pull-stop information and the like; the method has the advantages that the error check is prevented, the section limit value is modified, the prompt information is added on the human-computer interface, the operation can be carried out after the secondary confirmation, and the safety accident caused by the error operation is avoided.
Through the scheme, a direct current virtual control area is established, and the function of bundling and delivering the wind-solar-fire is realized by utilizing regional deviation control and safety constraint control; various plans and transaction data of wind-solar new energy source medium-long term transaction, spot transaction, auxiliary service and the like are subjected to accurate automatic power generation control, and accurate execution of various marketized transaction components is guaranteed while section safety is guaranteed; the AGC is combined with the thermal power peak regulation market, and the unit can be regulated according to different quotations of the auxiliary service market; the existing AGC interface is optimized, and the attractiveness and operability are improved. The function perfection can organically combine the safety of the power grid with the economic operation, further improve the automation level of intelligent scheduling, improve the consumption capacity of new energy, reduce the fluctuation of the power grid, and improve the safety and stability of the Qinghai power grid.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. An automatic power generation control system, comprising:
the thermal power generating unit and the new energy station are positioned in the constructed target control area;
and the control master station, the thermal power generating unit and the new energy station are used for carrying out automatic power generation control on the thermal power generating unit based on the first planned output power and the first actual output power of the thermal power generating unit and the second planned output power and the second actual output power of the new energy station.
2. The system of claim 1, further comprising:
direct current corresponding to the target control area;
and the control master station is connected with the direct current and used for generating the first planned output power and the second planned output power based on the power transmission plan, the short-term power prediction data and the ultra-short-term power prediction data of the direct current.
3. The system of claim 1, wherein the controlling master station comprises:
a processor for determining a zone control bias based on the first planned output power, the first actual output power, the second planned output power, and the second actual output power;
the comparison circuit is connected with the processor and used for obtaining a comparison result of the joint-variation transmission power and a first preset limit;
and the controller is connected with the processor, the comparison circuit and the thermal power generating unit and is used for carrying out automatic power generation control on the thermal power generating unit based on the regional control deviation and the comparison result.
4. The system of claim 3, further comprising:
the first filter circuit is connected with the processor and is used for carrying out data filtering and dynamic dead zone filtering on the region control deviation;
and the controller is connected with the first filter circuit and is used for carrying out automatic power generation control on the thermal power generating unit based on the filtered region control deviation and the comparison result.
5. The system of claim 3, further comprising:
a second filtering circuit for first-order filtering the first planned output power and the first actual output power;
a third filter circuit for median filtering the second planned output power and the second actual output power;
a processor, connected to the second filter circuit and the third filter circuit, configured to determine the zone control deviation based on the filtered first planned output power, the filtered first actual output power, the filtered second planned output power, and the filtered second actual output power.
6. The system of claim 1, further comprising:
the first trading system is used for storing trading power of each new energy station within a preset time period;
the first verification device is connected with the first transaction system and used for comparing the total transaction electric power of a target section in a preset time period with a second preset limit to obtain a first verification result of the target section, wherein the new energy station is located below the target section, and the total transaction electric power is the sum of the transaction electric powers of all stations below the target section in the preset time period;
and the control master station is connected with the first checking device and used for sending the target output power determined based on the first checking node to the new energy station.
7. The system of claim 6, further comprising:
a second transaction system for storing the in-stock power at each new energy station;
the second checking device is connected with the second transaction system and used for comparing the total spot power of the target section with a third preset limit to obtain a second checking result of the target section, wherein the total spot power is the sum of the spot power of all stations under the target section;
and the control master station is connected with the second check device and used for determining the target output power based on the second check result.
8. The system of claim 1, further comprising:
the energy storage power station corresponds to the new energy station;
and the control main station is connected with the energy storage power station and used for determining the charging power of the energy storage power station based on the limited power of the new energy station under the condition that the new energy station is determined to have the power limiting condition.
9. The system of claim 8, wherein the new energy station is in a one-to-one relationship with the energy storage power station; or the new energy station and the energy storage power station have a many-to-one relationship.
10. The system of claim 9, further comprising:
the receiving device is connected with a power grid and used for receiving the up-regulation requirement of the power grid;
and the control master station is connected with the receiving device and used for determining the discharge power of each energy storage power station in the plurality of energy storage power stations according to the received up-regulation requirement.
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