CN112072675A - Hydroelectric generating set primary and secondary frequency modulation cooperative control method - Google Patents
Hydroelectric generating set primary and secondary frequency modulation cooperative control method Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
- H02J3/14—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by switching loads on to, or off from, network, e.g. progressively balanced loading
- H02J3/144—Demand-response operation of the power transmission or distribution network
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
- Y02B70/3225—Demand response systems, e.g. load shedding, peak shaving
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/20—End-user application control systems
- Y04S20/222—Demand response systems, e.g. load shedding, peak shaving
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Abstract
The invention relates to the technical field of power systems, in particular to a hydropower unit primary and secondary frequency modulation cooperative control method. The control method comprises the following steps: determining a secondary frequency modulation state of the hydroelectric generating set; determining a control mode of the hydroelectric generating set; determining a primary frequency modulation state of the hydroelectric generating set; judging whether the primary and secondary frequency modulation action directions of the hydroelectric generating set are opposite or not; and controlling the hydroelectric generating set according to the principle that the action directions of the primary frequency modulation and the secondary frequency modulation are opposite, and the primary frequency modulation is preferred and the primary frequency modulation and the secondary frequency modulation are not influenced mutually when the action directions are the same. The invention considers two different control modes of the opening mode and the power mode of the hydroelectric generating set, and solves the problem that the first and second frequency modulation functions of the generating set conflict with each other due to lack of cooperative cooperation between systems; the invention improves the integral frequency modulation performance and effect of the unit, and enables the hydroelectric generating set to better participate in peak shaving and frequency modulation of a power grid.
Description
Technical Field
The invention relates to the technical field of power systems, in particular to a hydropower unit primary and secondary frequency modulation cooperative control method.
Background
The essence of grid frequency modulation is to control the dynamic balance between the power generated by the generator set and the power required by the mesh belt load. The primary frequency modulation function of the hydroelectric generating set is an automatic control process that when the power grid frequency deviates from a rated value of 50HZ, the running hydroelectric generating set control system controls guide vanes of a water turbine, so that the active power of the hydroelectric generating set is rapidly increased and decreased, and the power grid frequency is rapidly maintained stably. The secondary frequency modulation function of the hydroelectric generating set, namely Automatic Generation Control (AGC), means that a power dispatching mechanism performs classified control on the hydroelectric generating set in the network according to the adjustment performance and issues a power target value so as to maintain the balance of power generation and supply in a power system, thereby ensuring the quality of the frequency of the power system.
The hydroelectric generating set control system consists of a speed regulating system and a monitoring system. At present, the primary frequency modulation function of the hydroelectric generating set is mainly realized by a speed regulating system, the secondary frequency modulation function is provided by a monitoring system, and the primary frequency modulation function and the secondary frequency modulation function are relatively isolated. Because the monitoring system and the speed regulating system are usually not a manufacturer, and the difference of design concepts of different manufacturers often considers the functions of the respective systems singly, and the necessary cooperation is lacked between the monitoring system and the speed regulating system, the phenomenon that the primary frequency modulation function and the secondary frequency modulation function of the unit conflict with each other often occurs, and the frequency modulation effect of the unit is seriously influenced.
Therefore, it is necessary to provide a perfect primary and secondary frequency modulation cooperative control method by taking the operation mode and the control system of the hydroelectric generating set into consideration as a whole so as to improve the frequency modulation performance of the hydroelectric generating set.
Disclosure of Invention
The invention aims to solve at least one technical problem in the prior art and provides a primary frequency modulation and secondary frequency modulation cooperative control method for a hydroelectric generating set.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows: a primary frequency modulation and secondary frequency modulation cooperative control method for a hydroelectric generating set comprises the following steps:
determining a secondary frequency modulation state of the hydroelectric generating set, namely judging whether a secondary frequency modulation instruction currently received by the hydroelectric generating set is increasing or decreasing the load;
determining a control mode of the hydroelectric generating set, namely judging whether the control mode of the hydroelectric generating set is an opening degree mode or a power mode;
determining the primary frequency modulation state of the hydroelectric generating set, namely judging whether the current power grid frequency exceeds a primary frequency modulation action dead zone, comparing the current power grid frequency with a rated frequency, and if the power grid frequency exceeds the action dead zone and is greater than the rated frequency, indicating that the current power grid frequency is high; if the power grid frequency exceeds the action dead zone and is less than the rated frequency, indicating that the current power grid frequency is low;
judging whether the primary frequency modulation action direction and the secondary frequency modulation action direction of the hydroelectric generating set are opposite or not according to the determined secondary frequency modulation state, control mode and primary frequency modulation state information of the hydroelectric generating set;
and controlling the hydroelectric generating set according to the principle that the action directions of the primary frequency modulation and the secondary frequency modulation are opposite, and the primary frequency modulation is preferred and the primary frequency modulation and the secondary frequency modulation are not influenced mutually when the action directions are the same.
Further, if the hydroelectric generating set is in an opening mode, the current power grid frequency is high, and a secondary frequency modulation 'increasing load' instruction is received; judging that the action directions of the primary frequency modulation and the secondary frequency modulation of the current unit are opposite, triggering an increasing locking signal by the speed regulating system, and locking and increasing the load after the monitoring system receives the signal; meanwhile, the speed regulating system responds to load reduction compensation of primary frequency modulation, and directly superimposes the primary frequency modulation negative opening compensation quantity on the guide vane opening instruction. And when the frequency is restored to the frequency dead zone, increasing and eliminating a blocking signal, returning the compensation quantity of the primary frequency modulation opening to zero, and restoring the secondary frequency modulation function of the unit.
Further, if the hydroelectric generating set is in an opening mode, the current power grid frequency is high, and a secondary frequency modulation load reduction command is received, the action directions of the primary frequency modulation and the secondary frequency modulation of the current generating set are judged to be the same; the speed regulating system responds to the load reduction compensation of primary frequency modulation, and directly superimposes the primary frequency modulation negative opening compensation quantity on the guide vane opening instruction; meanwhile, the monitoring system continues to receive the secondary frequency modulation instruction, synchronously responds to load reduction compensation of primary frequency modulation, and superposes primary frequency modulation negative power compensation quantity on the given power value of the monitoring system so as to prevent reverse action of the monitoring system from influencing primary frequency modulation.
Further, if the hydroelectric generating set is in an opening mode, the current power grid frequency is low, and a secondary frequency modulation load increasing instruction is received, the action directions of the primary frequency modulation and the secondary frequency modulation of the current generating set are judged to be the same; the speed regulating system responds to the load increase compensation of the primary frequency modulation and directly superimposes the primary frequency modulation positive opening compensation quantity on the guide vane opening instruction; meanwhile, the monitoring system continues to receive the secondary frequency modulation instruction, synchronously responds to the load increase compensation of the primary frequency modulation, and superimposes the primary frequency modulation forward power compensation amount on the power set value of the monitoring system so as to prevent the reverse action of the monitoring system from influencing the primary frequency modulation.
Further, if the hydroelectric generating set is in an opening mode, the current power grid frequency is low, and a secondary frequency modulation load reduction command is received, the action directions of the primary frequency modulation and the secondary frequency modulation of the current generating set are judged to be opposite; the speed regulating system triggers a 'lock reduction' signal, and the monitoring system locks and reduces the load after receiving the signal; meanwhile, the speed regulating system responds to the load increase compensation of the primary frequency modulation and directly superimposes the primary frequency modulation positive opening compensation quantity on the guide vane opening instruction. And when the frequency is restored to the frequency dead zone, the locking reducing signal is eliminated, the compensation quantity of the primary frequency modulation opening degree returns to zero, and the secondary frequency modulation function of the unit is restored.
Further, if the hydroelectric generating set is in a power mode, the current power grid frequency is high, and a secondary frequency modulation load increasing command is received, the action directions of the primary frequency modulation and the secondary frequency modulation of the current generating set are judged to be opposite; the speed regulating system triggers an increasing locking signal to lock a secondary frequency modulation instruction, responds to load reduction compensation of primary frequency modulation, and directly superimposes a primary frequency modulation negative power compensation quantity on a power set value of the speed regulating system. And when the frequency is restored to the frequency dead zone, the blocking signal is eliminated, the primary frequency modulation power compensation amount returns to zero, and the speed regulating system receives the secondary frequency modulation instruction sent by the monitoring system again.
Further, if the hydroelectric generating set is in a power mode, the current power grid frequency is high, and a received secondary frequency modulation load reduction command is received, the action directions of the primary frequency modulation and the secondary frequency modulation of the current generating set are judged to be the same; and the speed regulating system continuously receives a secondary frequency modulation load reduction instruction transmitted by the monitoring system, responds to load reduction compensation of primary frequency modulation, and superimposes primary frequency modulation negative power compensation quantity on the current power given value.
Further, if the hydroelectric generating set is in a power mode, the current power grid frequency is low, and a secondary frequency modulation load increasing command is received, and the action directions of the primary frequency modulation and the secondary frequency modulation of the current generating set are judged to be the same; and the speed regulating system continuously receives a secondary frequency modulation load increasing instruction transmitted by the monitoring system, responds to load increasing compensation of primary frequency modulation, and superposes a primary frequency modulation forward power compensation amount on the current power given value.
Further, if the hydroelectric generating set is in a power mode, the current power grid frequency is low, and a secondary frequency modulation load reduction command is received, the action directions of the primary frequency modulation and the secondary frequency modulation of the current generating set are judged to be opposite; the speed regulating system triggers a 'lock-down' signal to lock up a secondary frequency modulation instruction, responds to the load increase compensation of primary frequency modulation, and directly superimposes the primary frequency modulation forward power compensation quantity on the power given value of the speed regulating system. And when the frequency is restored to the frequency dead zone, the blocking signal is eliminated, the primary frequency modulation power compensation amount returns to zero, and the speed regulating system receives the secondary frequency modulation instruction sent by the monitoring system again.
As can be seen from the above description of the present invention, compared with the prior art, the present invention has at least one of the following advantages:
1. the principle of cooperative control of primary and secondary frequency modulation of the hydroelectric generating set is provided, namely that the action directions of the primary and secondary frequency modulation are opposite, and the primary frequency modulation is preferred; the primary frequency modulation and the secondary frequency modulation have the same action direction and do not influence each other;
2. the method has the advantages that two different control modes of the opening mode and the power mode of the hydroelectric generating set are considered, frequency modulation functions which are respectively born by a monitoring system and a speed regulating system of the hydroelectric generating set under different operating conditions are coordinated, and the problem that mutual conflict of primary and secondary frequency modulation functions of the hydroelectric generating set occurs due to lack of cooperative cooperation between the systems is solved;
3. the frequency modulation performance and effect of the whole unit are improved, and the hydroelectric generating set can better participate in peak shaving and frequency modulation of a power grid.
Drawings
Fig. 1 is a schematic flow chart of a cooperative control method for primary and secondary frequency modulation of a hydroelectric generating set according to an embodiment of the present invention;
FIG. 2 is a diagram illustrating an inverse trend of the first and second frequency modulation of the hydroelectric generating set according to the first embodiment of the present invention;
fig. 3 is a graph showing the same trend of the first and second frequency modulation effects of the hydro-electric machine set according to the first embodiment of the present invention.
Detailed Description
The technical solutions in the present invention will be described clearly and completely 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.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "connected" and "connected" are to be interpreted broadly, e.g., as being fixed or detachable or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Referring to fig. 1 to 3, in a preferred embodiment of the present invention, a method for cooperative control of primary and secondary frequency modulation of a hydroelectric generating set includes:
determining a secondary frequency modulation state of the hydroelectric generating set, namely judging whether a secondary frequency modulation instruction currently received by the hydroelectric generating set is increasing or decreasing the load;
determining a control mode of the hydroelectric generating set, namely judging whether the control mode of the hydroelectric generating set is an opening degree mode or a power mode;
determining the primary frequency modulation state of the hydroelectric generating set, namely judging whether the current power grid frequency exceeds a primary frequency modulation action dead zone, comparing the current power grid frequency with a rated frequency, and if the power grid frequency exceeds the action dead zone and is greater than the rated frequency, indicating that the current power grid frequency is high; if the power grid frequency exceeds the action dead zone and is less than the rated frequency, indicating that the current power grid frequency is low;
judging whether the primary frequency modulation action direction and the secondary frequency modulation action direction of the hydroelectric generating set are opposite or not according to the determined secondary frequency modulation state, control mode and primary frequency modulation state information of the hydroelectric generating set;
and controlling the hydroelectric generating set according to the principle that the action directions of the primary frequency modulation and the secondary frequency modulation are opposite, and the primary frequency modulation is preferred and the primary frequency modulation and the secondary frequency modulation are not influenced mutually when the action directions are the same.
The invention provides a principle of cooperative control of primary and secondary frequency modulation of a hydroelectric generating set, namely that the action directions of the primary and secondary frequency modulation are opposite, and the primary frequency modulation is prior; the primary frequency modulation and the secondary frequency modulation have the same action direction and do not influence each other. The invention considers two different control modes of the opening mode and the power mode of the hydroelectric generating set, coordinates the frequency modulation actions which are respectively born by the monitoring system and the speed regulating system of the hydroelectric generating set under different operating conditions, and solves the problem that the mutual conflict of the primary frequency modulation function and the secondary frequency modulation function of the hydroelectric generating set occurs due to lack of cooperative coordination between the systems. The invention improves the integral frequency modulation performance and effect of the unit, and enables the hydroelectric generating set to better participate in peak shaving and frequency modulation of a power grid.
In this embodiment, if the hydroelectric generating set is in the opening mode, the current grid frequency is high, and a secondary frequency modulation "increasing load" instruction is received; judging that the action directions of the primary frequency modulation and the secondary frequency modulation of the current unit are opposite, triggering an increasing locking signal by the speed regulating system, and locking and increasing the load after the monitoring system receives the signal; meanwhile, the speed regulating system responds to load reduction compensation of primary frequency modulation, and directly superimposes the primary frequency modulation negative opening compensation quantity on the guide vane opening instruction. And when the frequency is restored to the frequency dead zone, increasing and eliminating a blocking signal, returning the compensation quantity of the primary frequency modulation opening to zero, and restoring the secondary frequency modulation function of the unit.
In this embodiment, if the hydroelectric generating set is in the opening mode, the current power grid frequency is high, and a secondary frequency modulation load reduction command is received, it is determined that the primary and secondary frequency modulation directions of the current generating set are the same; the speed regulating system responds to the load reduction compensation of primary frequency modulation, and directly superimposes the primary frequency modulation negative opening compensation quantity on the guide vane opening instruction; meanwhile, the monitoring system continues to receive the secondary frequency modulation instruction, synchronously responds to load reduction compensation of primary frequency modulation, and superposes primary frequency modulation negative power compensation quantity on the given power value of the monitoring system so as to prevent reverse action of the monitoring system from influencing primary frequency modulation.
In this embodiment, if the hydroelectric generating set is in the opening mode, the current power grid frequency is low, and a secondary frequency modulation "increasing load" instruction is received, it is determined that the primary and secondary frequency modulation directions of the current generating set are the same; the speed regulating system responds to the load increase compensation of the primary frequency modulation and directly superimposes the primary frequency modulation positive opening compensation quantity on the guide vane opening instruction; meanwhile, the monitoring system continues to receive the secondary frequency modulation instruction, synchronously responds to the load increase compensation of the primary frequency modulation, and superimposes the primary frequency modulation forward power compensation amount on the power set value of the monitoring system so as to prevent the reverse action of the monitoring system from influencing the primary frequency modulation.
In this embodiment, if the hydroelectric generating set is in the opening mode, the current power grid frequency is low, and a secondary frequency modulation load reduction command is received, it is determined that the primary and secondary frequency modulation directions of the current generating set are opposite; the speed regulating system triggers a 'lock reduction' signal, and the monitoring system locks and reduces the load after receiving the signal; meanwhile, the speed regulating system responds to the load increase compensation of the primary frequency modulation and directly superimposes the primary frequency modulation positive opening compensation quantity on the guide vane opening instruction. And when the frequency is restored to the frequency dead zone, the locking reducing signal is eliminated, the compensation quantity of the primary frequency modulation opening degree returns to zero, and the secondary frequency modulation function of the unit is restored.
In this embodiment, if the hydroelectric generating set is in the power mode, the current grid frequency is high, and a secondary frequency modulation "increasing load" instruction is received, it is determined that the primary and secondary frequency modulation directions of the current generating set are opposite; the speed regulating system triggers an increasing locking signal to lock a secondary frequency modulation instruction, responds to load reduction compensation of primary frequency modulation, and directly superimposes a primary frequency modulation negative power compensation quantity on a power set value of the speed regulating system. And when the frequency is restored to the frequency dead zone, the blocking signal is eliminated, the primary frequency modulation power compensation amount returns to zero, and the speed regulating system receives the secondary frequency modulation instruction sent by the monitoring system again.
In this embodiment, if the hydroelectric generating set is in the power mode, the current grid frequency is high, and a received secondary frequency modulation "load reduction" instruction is received, it is determined that the primary and secondary frequency modulation directions of the current generating set are the same; and the speed regulating system continuously receives a secondary frequency modulation load reduction instruction transmitted by the monitoring system, responds to load reduction compensation of primary frequency modulation, and superimposes primary frequency modulation negative power compensation quantity on the current power given value.
In this embodiment, if the hydroelectric generating set is in the power mode, the current power grid frequency is low, and a secondary frequency modulation "increasing load" instruction is received, and the action directions of the primary frequency modulation and the secondary frequency modulation of the current generating set are judged to be the same; and the speed regulating system continuously receives a secondary frequency modulation load increasing instruction transmitted by the monitoring system, responds to load increasing compensation of primary frequency modulation, and superposes a primary frequency modulation forward power compensation amount on the current power given value.
In this embodiment, if the hydroelectric generating set is in the power mode, the current grid frequency is low, and a secondary frequency modulation load reduction command is received, it is determined that the primary and secondary frequency modulation directions of the current generating set are opposite; the speed regulating system triggers a 'lock-down' signal to lock up a secondary frequency modulation instruction, responds to the load increase compensation of primary frequency modulation, and directly superimposes the primary frequency modulation forward power compensation quantity on the power given value of the speed regulating system. And when the frequency is restored to the frequency dead zone, the blocking signal is eliminated, the primary frequency modulation power compensation amount returns to zero, and the speed regulating system receives the secondary frequency modulation instruction sent by the monitoring system again.
The first embodiment is as follows:
the following is to apply the primary and secondary frequency modulation cooperative control method of the hydroelectric generating set to a certain hydroelectric generating set.
Step 1: determining that the hydroelectric generating set has primary frequency modulation and secondary frequency modulation functions;
step 2: setting a judgment condition 1, wherein the condition 1 is to judge whether the current secondary frequency modulation instruction is increasing or decreasing; setting the number of the condition 1 to be 1 when increasing, and setting the number of the condition 1 to be 0 when decreasing;
the judgment formula is shown as formula 1:
P1-P0>0 is increasing
P1-P0<0 is decreasing formula 1
P1-a currently received chirp command;
P0-a secondary frequency modulation command received at a previous time;
and step 3: and setting a judgment condition 2, wherein the condition 2 is to judge the control mode of the current unit. The setting number of the condition 2 is 1 in the opening mode, and the setting number of the condition 2 is 0 in the power mode;
the control mode of the unit can be judged through an instruction sent to the speed regulating system by the monitoring system, if the control mode is a switching value pulse signal, the control mode is an opening mode, and if the control mode is an analog signal, the control mode is a power mode;
the judgment formula is shown in formula 2:
f>f1+ef1high frequency
f<f1–ef2 Low frequency formula 2
f, power grid real-time frequency;
f1rated frequency of the grid, designIs set as 50 HZ;
ef1-a hydroelectric generating set primary frequency modulation upper limit dead zone;
ef2-a hydroelectric generating set primary frequency modulation lower limit dead zone;
primary frequency modulation dead zone ef1、ef2Can be obtained by: a series of frequency signals are sent to a water turbine speed regulator by using a frequency generation device, each frequency interval is less than 0.005HZ, and a primary frequency modulation action switching value is observed at the same time, if the primary frequency modulation action switching value is 1, a primary frequency modulation dead zone can be calculated by subtracting a rated frequency from a currently sent frequency value, and the embodiment of the invention is not specifically limited to this;
the monitoring system and the speed regulating system of the hydroelectric generating set are main bodies for implementing frequency modulation, and how to coordinate actions can be determined by a table look-up method, which is shown in the following table:
| |
|
|
Movement of the |
| 1 | 1 | 1 | |
| 0 | 1 | 1 | |
| 1 | 1 | 0 | Step 7 |
| 0 | 1 | 0 | Step 8 |
| 1 | 0 | 1 | Step 9 |
| 0 | 0 | 1 | Step 10 |
| 1 | 0 | 0 | Step 11 |
| 0 | 0 | 0 | Step 12 |
And 5, the speed regulating system responds to the opening compensation of the primary frequency modulation, as shown in the formula 3:
meanwhile, the speed regulating system sends an increasing locking signal to the monitoring system, and the monitoring system sets the current secondary frequency modulation instruction as a power setting upper limit value to realize increasing locking; when the frequency is recovered to the frequency dead zone, recovering the upper limit value;
meanwhile, the monitoring system receives a secondary frequency modulation instruction and synchronously responds to the power compensation of the primary frequency modulation, as shown in formula 4:
and 8: the speed regulating system responds to the opening compensation of the primary frequency modulation, as shown in formula 3, meanwhile, the speed regulating system sends a locking reduction signal to the monitoring system, and the monitoring system sets the current secondary frequency modulation instruction as an instruction lower limit value to realize locking reduction; when the frequency is recovered to the frequency dead zone, recovering the lower limit value;
step 9, the speed regulating system responds to primary frequency modulation power compensation, as shown in formula 5, meanwhile, the speed regulating system does not receive a new power set value sent by the monitoring system, and sets a currently received instruction as a power set upper limit value to realize locking, and when the frequency is recovered to a frequency dead zone, the upper limit value is recovered, and the power set value sent by the monitoring system is received again;
step 10 and step 11, judging that the action directions of the first frequency modulation and the second frequency modulation of the unit are the same, responding to the power compensation of the first frequency modulation by the speed regulating system, as shown in a formula 5, and continuously sending a second frequency modulation instruction to the power set value of the speed regulating system by the monitoring system;
step 12: the speed regulation system responds to the primary frequency modulation power compensation, as shown in formula 5. Meanwhile, the speed regulating system does not receive a new power set value sent by the monitoring system, the current received instruction is set as a power set lower limit value to realize locking reduction, and when the frequency is recovered to a frequency dead zone, the lower limit value is recovered, and the power set value sent by the monitoring system is received again.
The effect of the first embodiment is as follows:
fig. 2 is a diagram showing the trend of the hydroelectric generating set in opposite directions of primary and secondary frequency modulation. As can be seen from the figure, when the primary and secondary operations are simultaneously performed, the primary frequency modulation operation is prioritized, and the secondary frequency modulation operation is locked. After the frequency is recovered to the frequency dead zone, secondary frequency modulation continues to act;
fig. 3 is a trend chart of the hydroelectric generating set with the same primary and secondary frequency modulation directions. It can be seen from the figure that when the primary and secondary frequency modulation act simultaneously, the acting forces are superposed and do not influence each other;
the primary frequency modulation and the secondary frequency modulation of the hydroelectric generating set act in a cooperative mode, the problem that the functions of the primary frequency modulation and the secondary frequency modulation of the hydroelectric generating set conflict due to the fact that a monitoring system and a speed regulating system are lack of cooperative cooperation is solved, and the integral frequency modulation performance and effect of the hydroelectric generating set are improved.
The above additional technical features can be freely combined and used in superposition by those skilled in the art without conflict.
It is to be understood that the present invention has been described with reference to certain embodiments, and that various changes in the features and embodiments, or equivalent substitutions may be made therein by those skilled in the art without departing from the spirit and scope of the invention. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from the essential scope thereof. Therefore, it is intended that the invention not be limited to the particular embodiment disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.
Claims (9)
1. A primary frequency modulation and secondary frequency modulation cooperative control method for a hydroelectric generating set is characterized by comprising the following steps:
determining a secondary frequency modulation state of the hydroelectric generating set, namely judging whether a secondary frequency modulation instruction currently received by the hydroelectric generating set is increasing or decreasing the load;
determining a control mode of the hydroelectric generating set, namely judging whether the control mode of the hydroelectric generating set is an opening degree mode or a power mode;
determining the primary frequency modulation state of the hydroelectric generating set, namely judging whether the current power grid frequency exceeds a primary frequency modulation action dead zone, comparing the current power grid frequency with a rated frequency, and if the power grid frequency exceeds the action dead zone and is greater than the rated frequency, indicating that the current power grid frequency is high; if the power grid frequency exceeds the action dead zone and is less than the rated frequency, indicating that the current power grid frequency is low;
judging whether the primary frequency modulation action direction and the secondary frequency modulation action direction of the hydroelectric generating set are opposite or not according to the determined secondary frequency modulation state, control mode and primary frequency modulation state information of the hydroelectric generating set;
and controlling the hydroelectric generating set according to the principle that the action directions of the primary frequency modulation and the secondary frequency modulation are opposite, and the primary frequency modulation is preferred and the primary frequency modulation and the secondary frequency modulation are not influenced mutually when the action directions are the same.
2. The cooperative control method for the primary and secondary frequency modulation of the hydroelectric generating set according to claim 1, characterized in that: if the hydroelectric generating set is in the opening mode, the current power grid frequency is high, and a secondary frequency modulation 'increasing load' instruction is received; judging that the action directions of the primary frequency modulation and the secondary frequency modulation of the current unit are opposite, triggering an increasing locking signal by the speed regulating system, and locking and increasing the load after the monitoring system receives the signal; meanwhile, the speed regulating system responds to load reduction compensation of primary frequency modulation, the primary frequency modulation negative opening compensation quantity is directly superposed on the guide vane opening command, when the frequency is restored to the frequency dead zone, the locking signal is increased and eliminated, the primary frequency modulation opening compensation quantity returns to zero, and the secondary frequency modulation function of the unit is restored.
3. The cooperative control method for the primary and secondary frequency modulation of the hydroelectric generating set according to claim 1, characterized in that: if the hydroelectric generating set is in an opening mode, the current power grid frequency is high, and a secondary frequency modulation load reduction command is received, judging that the action directions of the primary frequency modulation and the secondary frequency modulation of the current generating set are the same; the speed regulating system responds to the load reduction compensation of primary frequency modulation, and directly superimposes the primary frequency modulation negative opening compensation quantity on the guide vane opening instruction; meanwhile, the monitoring system continues to receive the secondary frequency modulation instruction, synchronously responds to load reduction compensation of primary frequency modulation, and superposes primary frequency modulation negative power compensation quantity on the given power value of the monitoring system so as to prevent reverse action of the monitoring system from influencing primary frequency modulation.
4. The cooperative control method for the primary and secondary frequency modulation of the hydroelectric generating set according to claim 1, characterized in that: if the hydroelectric generating set is in an opening mode, the current power grid frequency is low, and a secondary frequency modulation load increasing instruction is received, judging that the action directions of the primary frequency modulation and the secondary frequency modulation of the current generating set are the same; the speed regulating system responds to the load increase compensation of the primary frequency modulation and directly superimposes the primary frequency modulation positive opening compensation quantity on the guide vane opening instruction; meanwhile, the monitoring system continues to receive the secondary frequency modulation instruction, synchronously responds to the load increase compensation of the primary frequency modulation, and superimposes the primary frequency modulation forward power compensation amount on the power set value of the monitoring system so as to prevent the reverse action of the monitoring system from influencing the primary frequency modulation.
5. The cooperative control method for the primary and secondary frequency modulation of the hydroelectric generating set according to claim 1, characterized in that: if the hydroelectric generating set is in an opening mode, the current power grid frequency is low, and a secondary frequency modulation load reduction command is received, judging that the primary frequency modulation action direction and the secondary frequency modulation action direction of the current generating set are opposite; the speed regulating system triggers a 'lock reduction' signal, and the monitoring system locks and reduces the load after receiving the signal; meanwhile, the speed regulating system responds to the load increase compensation of the primary frequency modulation, the primary frequency modulation positive opening compensation quantity is directly superposed on the guide vane opening instruction, when the frequency is recovered to the frequency dead zone, the locking reducing signal is eliminated, the primary frequency modulation opening compensation quantity returns to zero, and the secondary frequency modulation function of the unit is recovered.
6. The cooperative control method for the primary and secondary frequency modulation of the hydroelectric generating set according to claim 1, characterized in that: if the hydroelectric generating set is in a power mode, the current power grid frequency is high, and a secondary frequency modulation load increasing instruction is received, judging that the action directions of the primary frequency modulation and the secondary frequency modulation of the current generating set are opposite; the speed regulating system triggers an increasing blocking signal to block a secondary frequency regulating instruction, responds to load reduction compensation of primary frequency regulation, directly superimposes primary frequency regulation negative power compensation quantity on a power set value of the speed regulating system, and when the frequency is restored to a frequency dead zone, the blocking signal is eliminated, the primary frequency regulation power compensation quantity returns to zero, and the speed regulating system receives the secondary frequency regulating instruction sent by the monitoring system again.
7. The cooperative control method for the primary and secondary frequency modulation of the hydroelectric generating set according to claim 1, characterized in that: if the hydroelectric generating set is in a power mode, the current power grid frequency is high, and a received secondary frequency modulation load reduction command is received, judging that the action directions of the primary frequency modulation and the secondary frequency modulation of the current generating set are the same; and the speed regulating system continuously receives a secondary frequency modulation load reduction instruction transmitted by the monitoring system, responds to load reduction compensation of primary frequency modulation, and superimposes primary frequency modulation negative power compensation quantity on the current power given value.
8. The cooperative control method for the primary and secondary frequency modulation of the hydroelectric generating set according to claim 1, characterized in that: if the hydroelectric generating set is in a power mode, the current power grid frequency is low, and a secondary frequency modulation load increasing command is received, and the action directions of the primary frequency modulation and the secondary frequency modulation of the current generating set are judged to be the same; and the speed regulating system continuously receives a secondary frequency modulation load increasing instruction transmitted by the monitoring system, responds to load increasing compensation of primary frequency modulation, and superposes a primary frequency modulation forward power compensation amount on the current power given value.
9. The cooperative control method for the primary and secondary frequency modulation of the hydroelectric generating set according to claim 1, characterized in that: if the hydroelectric generating set is in a power mode, the current power grid frequency is low, and a secondary frequency modulation load reduction command is received, judging that the action directions of the primary frequency modulation and the secondary frequency modulation of the current generating set are opposite; the speed regulating system triggers a 'lock reduction' signal to lock a secondary frequency modulation instruction, responds to the load increase compensation of primary frequency modulation, directly superimposes the primary frequency modulation forward power compensation quantity on the power given value of the speed regulating system, and when the frequency is restored to a frequency dead zone, the lock signal is eliminated, the primary frequency modulation power compensation quantity returns to zero, and the speed regulating system receives the secondary frequency modulation instruction sent by the monitoring system again.
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| CN114069655A (en) * | 2021-11-16 | 2022-02-18 | 辽宁东科电力有限公司 | Primary frequency modulation and secondary frequency modulation coordination control method for wind power plant |
| CN114188992A (en) * | 2021-11-05 | 2022-03-15 | 华能澜沧江水电股份有限公司 | Compatible frequency modulation adjusting method for hydroelectric generating set |
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| CN114069655A (en) * | 2021-11-16 | 2022-02-18 | 辽宁东科电力有限公司 | Primary frequency modulation and secondary frequency modulation coordination control method for wind power plant |
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