CN115833273A - Primary frequency modulation control method, medium and system for hybrid energy storage system - Google Patents
Primary frequency modulation control method, medium and system for hybrid energy storage system Download PDFInfo
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Abstract
The invention discloses a primary frequency modulation control method, medium and system of a hybrid energy storage system, which comprises the following steps: determining the current adjusting capacity of the coal-fired power generating unit under the normal operation state, wherein the adjusting capacity comprises the following steps: an upward adjustment capability and a downward adjustment capability; calculating to obtain the load regulation power required by the power grid according to the obtained current actual frequency deviation of the power grid; and controlling the rotating speed of the flywheel energy storage array according to the type of the adjusting capacity of the coal-fired generator set, and controlling the flywheel energy storage array to perform primary frequency modulation according to the load adjusting power. The invention can improve the primary frequency modulation capability of the unit, ensure the frequency modulation amount, reduce the frequent actions of the high-regulating gate of the coal-fired generator set, reduce the power fluctuation caused by the step action of the high-regulating gate of the coal-fired generator set, reduce the coal consumption of the coal-fired generator set and improve the utilization rate of the flywheel energy storage array.
Description
Technical Field
The invention relates to the technical field of frequency modulation of hybrid energy storage systems, in particular to a primary frequency modulation control method, medium and system of a hybrid energy storage system.
Background
The primary frequency modulation control of the existing coal-electric unit basically adopts the heat storage capacity of a unit boiler and a steam turbine, and the primary frequency modulation requirement is met by responding to the frequency action through a steam turbine high-regulating valve. This method requires that the high governing valve of the steam turbine has a fast response speed, a high-strength tolerance capacity and a certain throttle amount. The new energy accounts for more than increasing gradually in the construction of novel electric power system, and the frequency change of electric wire netting is showing and is increasing, and the frequency and the scope of coal-fired unit primary control increase by a wide margin. The normal coal-fired unit is put into primary frequency modulation of 60% of rated power of the unit or above, and the primary frequency modulation gradually extends to the deep peak modulation interval of the coal-fired unit at present.
The flywheel energy storage has the rapid charging and discharging capacity and the rapid response capacity, and can meet the requirement of the primary frequency modulation characteristic of a power grid, but the flywheel energy storage capacity is limited and cannot completely meet the requirement of the primary frequency modulation amplitude of the coal power. At present, the prior art of the flywheel energy storage participating in primary frequency modulation mainly focuses on the control logic of the primary frequency modulation after the frequency difference occurs in a power grid, and adopts a mode that the flywheel energy storage and a coal-fired unit participate in frequency modulation at the same time. The method does not combine the actual situation of the power grid, does not consider various characteristics of flywheel energy storage and coal-electricity primary frequency modulation, and cannot give full play to the advantages of the flywheel energy storage and the coal-electricity primary frequency modulation.
Disclosure of Invention
The embodiment of the invention provides a primary frequency modulation control method, medium and system of a hybrid energy storage system, and aims to solve the problem that the advantages of flywheel energy storage and coal-electricity primary frequency modulation cannot be fully played because various characteristics of the flywheel energy storage and the coal-electricity primary frequency modulation are not considered in the conventional primary frequency modulation technology.
In a first aspect, a primary frequency modulation control method for a hybrid energy storage system is provided, which includes:
determining the current adjusting capacity of the coal-fired power generating unit under the normal operation state, wherein the adjusting capacity comprises the following steps: an upward adjustment capability and a downward adjustment capability;
calculating to obtain the load regulation power required by the power grid according to the obtained current actual frequency deviation of the power grid;
and controlling the rotating speed of the flywheel energy storage array according to the type of the adjusting capacity of the coal-fired generator set, and controlling the flywheel energy storage array to perform primary frequency modulation according to the load adjusting power.
In a second aspect, a computer-readable storage medium having computer program instructions stored thereon is provided; the computer program instructions, when executed by a processor, implement a hybrid energy storage system primary frequency modulation control method as described in the embodiments of the first aspect above.
In a third aspect, a primary frequency modulation control system of a hybrid energy storage system is provided, which includes: a computer readable storage medium as described in the second aspect of the embodiments above.
Therefore, the embodiment of the invention can improve the primary frequency modulation capability of the unit, ensure the frequency modulation amount, reduce the frequent actions of the high-regulating door of the coal-fired power generator unit, reduce the power fluctuation caused by the step action of the high-regulating door of the coal-fired power generator unit, reduce the coal consumption of the coal-fired power generator unit and improve the utilization rate of the flywheel energy storage array.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments of the present invention will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without inventive labor.
Fig. 1 is a flowchart of a primary frequency modulation control method of a hybrid energy storage system according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The embodiment of the invention discloses a primary frequency modulation control method of a hybrid energy storage system. As shown in fig. 1, the method of the embodiment of the present invention includes the following steps:
step S101: and determining the current adjustment capability of the coal-fired power generating unit in the normal operation state.
Wherein the adjustment capability comprises: an upward adjustment capability and a downward adjustment capability.
The adjusting capacity can be determined by the current load of the coal-fired power generating unit and the current opening degree of the feedback signal of the high-regulating gate, therefore, preferably, before this step, the method of the embodiment of the invention comprises the following steps:
and determining the current load of the coal-fired power generating set and the opening degree of the current high regulating valve feedback signal.
The specific process is as follows:
(1) And if the current load of the coal-fired generator set is the maximum load and the opening of the current high-regulating-valve feedback signal is larger than a first preset opening, determining that the coal-fired generator set does not have upward regulating capability at present.
The first predetermined opening degree may be set empirically, and generally, the first predetermined opening degree is close to the maximum opening degree.
(2) And if the current load of the coal-fired generator set is a stable combustion load and the opening of the current high throttle feedback signal is smaller than a second preset opening, determining that the coal-fired generator set does not have downward regulation capability at present.
It should be understood that the second preset opening degree is smaller than the first preset opening degree. The second predetermined opening degree may be set empirically, and typically, the second predetermined opening degree is close to the minimum opening degree.
(3) And if the current load of the coal-fired generator set is smaller than the maximum load and larger than the stable combustion load, and the opening degree of the current high throttle feedback signal is not larger than a first preset opening degree and not smaller than a second preset opening degree, determining that the coal-fired generator set currently has upward adjusting capacity and downward adjusting capacity.
Step S102: and calculating to obtain the load regulation power required by the power grid according to the obtained current actual frequency deviation of the power grid.
Specifically, the calculation formula of the load regulation power required by the power grid is as follows:
where Δ p denotes the load regulation power, Δ f denotes the actual frequency deviation, Δ f = f-f d F denotes the detected frequency deviation of the network, f d Representing the dead zone frequency of the coal-fired power generating unit, delta representing the rotational speed inequality rate of the coal-fired power generating unit, p n Representing the rated power of the coal-fired power unit.
Step S103: and controlling the rotating speed of the flywheel energy storage array according to the type of the adjusting capacity of the coal-fired generator set, and controlling the flywheel energy storage array to adjust power according to the load to perform primary frequency modulation.
Specifically, the steps include the following cases:
(1) And if the coal-fired generator set does not have upward adjustment capability at present, controlling the rotating speed of the flywheel energy storage array to be the maximum rotating speed, and enabling the flywheel energy storage array to discharge according to the absolute value of the discharge power as the load adjustment power.
Take an example of a generator set with a capacity of 600MW configured with a flywheel energy storage array of 36MW. When the coal-fired power generating unit runs at the full load of 600MW (namely the maximum load), and the feedback signal of the high regulating valve is fully opened (namely, the feedback signal is necessarily larger than the first preset opening), the coal-fired power generating unit has no upward regulating capacity. The rotating speed of the flywheel energy storage array is adjusted to be the maximum rotating speed, and at the moment, the flywheel energy storage array can only discharge and can not be charged.
And if the detected frequency deviation of the power grid is-0.1833 Hz, the actual frequency deviation is-0.15 Hz, and the absolute value of the required upward load regulation power is 36MW through calculation of the calculation formula in the step S102. At the moment, the load instruction is transmitted to the flywheel energy storage array, and the flywheel energy storage array discharges and outputs 36MW.
(2) And if the coal-fired generator set does not have downward regulation capability at present, controlling the rotating speed of the flywheel energy storage array to be the minimum rotating speed, and enabling the flywheel energy storage array to be charged according to the charging power as the absolute value of the load regulation power.
Take an example of a generator set with a capacity of 600MW configured with a flywheel energy storage array of 36MW. When the coal-fired generating set operates at a stable combustion load of 200MW, and the opening degree of the feedback signal of the high regulating valve is already the minimum value (namely is necessarily smaller than the second preset opening degree), the coal-fired generating set does not have downward regulating capacity. The rotating speed of the flywheel energy storage array is adjusted to be the minimum rotating speed, and at the moment, the flywheel energy storage array can only be charged and can not be discharged.
And if the detected frequency deviation of the power grid is 0.1833Hz, the actual frequency deviation is 0.15Hz, and the absolute value of the required downward load regulation power is 36MW calculated by the calculation formula in the step S102. At the moment, the load instruction is transmitted to the flywheel energy storage array, and the flywheel energy storage array charges and absorbs 36MW.
(3) And if the coal-fired generator set has upward adjustment capability and downward adjustment capability at present, controlling the rotating speed of the flywheel energy storage array to be an intermediate rotating speed, and controlling the flywheel energy storage array to perform charging and discharging based on the positive and negative of the current actual frequency deviation according to the magnitude relation between the maximum frequency deviation which can be provided by the flywheel energy storage array and the absolute value of the current actual frequency deviation.
The intermediate rotating speed is less than the maximum rotating speed of the flywheel energy storage array and greater than the minimum rotating speed of the flywheel energy storage array.
The maximum frequency deviation which can be provided by the flywheel energy storage array can be obtained through the following processes:
and multiplying the historical frequency deviation with the maximum occurrence frequency in the historical frequency deviations in the preset historical time period by a preset percentage to obtain the maximum frequency deviation provided by the flywheel energy storage array.
The preset historical time period may be determined empirically, for example, the preset historical time period is 1 year. The historical frequency deviation can be obtained by PMU data analysis. The preset percentage may be determined empirically, for example, the preset percentage is 80%. By determining the maximum frequency deviation that the flywheel energy storage array can provide, the model of the selected flywheel energy storage array can be determined to meet the power demand that can be provided. The power is calculated as described above, i.e.
Wherein, Δ p p Representing the power available from the flywheel energy storage array, f p Represents the maximum frequency deviation provided by the flywheel energy storage array, delta represents the rotation speed inequality rate, and p n Indicating the rated power of the coal-fired power unit.
Take an example of a generator set with a capacity of 600MW configured with a flywheel energy storage array of 36MW. When the coal-fired generating set operates at a load of 400MW, the opening degree of the feedback signal of the high regulating valve is a middle value and is positioned between the first preset opening degree and the second preset opening degree, and at the moment, the coal-fired generating set has upward and downward regulating capacity. The rotating speed of the flywheel energy storage array is adjusted to be the middle rotating speed, the flywheel energy storage array has the charging and discharging capacity at the moment, and specific charging or discharging needs to be determined according to the positive and negative of the current actual frequency deviation.
In this case, several control methods are specifically included as follows:
(1) and if the absolute value of the current actual frequency deviation is not greater than the maximum frequency deviation provided by the flywheel energy storage array and the current actual frequency deviation is negative, controlling the flywheel energy storage array to discharge according to the absolute value of the discharge power as the load regulation power.
Take an example of a generator set with a capacity of 600MW configured with a flywheel energy storage array of 36MW. The detected frequency deviation of the power grid is-0.1833 Hz, the actual frequency deviation is-0.15 Hz, and the absolute value of the actual frequency deviation is not more than the maximum frequency deviation f provided by the flywheel energy storage array p The absolute value of the required upward load regulation power is calculated by the calculation formula in step S102 to be 36MW. At this time, the negativeThe charge instruction is transmitted to the flywheel energy storage array, and the flywheel energy storage array discharges and outputs 36MW.
(2) And if the absolute value of the current actual frequency deviation is not greater than the maximum frequency deviation which can be provided by the flywheel energy storage array and the current actual frequency deviation is positive, controlling the flywheel energy storage array to charge according to the absolute value of the charging power which is the load adjusting power.
Take an example of a generator set with a capacity of 600MW configured with a flywheel energy storage array of 36MW. The detected frequency deviation of the power grid is 0.1833Hz, the actual frequency deviation is 0.15Hz, and the absolute value of the actual frequency deviation is not more than the maximum frequency deviation f provided by the flywheel energy storage array p The absolute value of the required downward load regulation power is calculated by the calculation formula in step S102 to be 36MW. At the moment, the load instruction is transmitted to the flywheel energy storage array, and the flywheel energy storage array charges and absorbs 36MW.
(3) And if the absolute value of the current actual frequency deviation is greater than the maximum frequency deviation provided by the flywheel energy storage array and the current actual frequency deviation is negative, controlling the flywheel energy storage array to discharge according to the discharge power corresponding to the maximum frequency deviation provided by the flywheel energy storage array, and controlling the coal-fired generator set to increase the output power of the coal-fired generator set according to the power corresponding to the difference value between the absolute value of the current actual frequency deviation and the maximum frequency deviation provided by the flywheel energy storage array.
It should be understood that, since the flywheel energy storage array can be charged and discharged at this time, the discharge power and the charge power corresponding to the maximum frequency deviation are equal, and are half of the total power corresponding to the maximum frequency deviation.
Take an example of a generator set with a capacity of 600MW configured with a flywheel energy storage array of 36MW. The detected frequency deviation of the power grid is-0.1833 Hz, the actual frequency deviation is-0.15 Hz, and the absolute value of the actual frequency deviation is larger than the maximum frequency deviation f provided by the flywheel energy storage array p The absolute value of the required upward load regulation power is calculated by the calculation formula in step S102 to be 36MW. At the moment, the load instruction is transmitted to the flywheel energy storage array, and the flywheel energy storage array discharges to output the maximum frequency deviation f p Corresponding discharge power 18MW, remaining 1The 8MW is completed by a turbine speed regulating system of the coal-fired power generating set, so that the output power of the coal-fired power generating set is increased by 18MW.
In this process, the high rate of throttle action is simultaneously reduced.
(4) And if the absolute value of the current actual frequency deviation is greater than the maximum frequency deviation provided by the flywheel energy storage array and the current actual frequency deviation is positive, controlling the flywheel energy storage array to charge according to the charging power corresponding to the maximum frequency deviation provided by the flywheel energy storage array, and controlling the coal-fired generator set to reduce the output power of the coal-fired generator set according to the difference value between the absolute value of the current actual frequency deviation and the maximum frequency deviation provided by the flywheel energy storage array.
Take an example of a generator set with a capacity of 600MW configured with a flywheel energy storage array of 36MW. The detected frequency deviation of the power grid is 0.1833Hz, the actual frequency deviation is 0.15Hz, and the absolute value of the actual frequency deviation is larger than the maximum frequency deviation f provided by the flywheel energy storage array p The absolute value of the required downward load regulation power is calculated by the calculation formula in step S102 to be 36MW. At the moment, the load instruction is transmitted to the flywheel energy storage array, and the flywheel energy storage array absorbs the maximum frequency deviation f during charging p The corresponding charging power is 18MW, and the rest 18MW is completed by a turbine speed regulating system of the coal-fired power generating unit, so that the output power of the coal-fired power generating unit is reduced by 18MW.
In this process, the high rate of throttle action is simultaneously reduced.
By the primary frequency modulation method, taking the energy storage amount of the flywheel configured by the unit as 36MW capacity as an example, the 1MW theory is reduced to 1.229 tons of standard coal, and 44.244 (36 × 1.229= 44.244) tons of standard coal can be saved.
Preferably, before step S101, it may be determined whether the coal-fired power generating unit is in a normal operation state by:
(1) And collecting pressure, temperature and flow signals of the coal-fired generator set.
Specifically, the pressure signal includes: a main steam pressure signal, a condenser pressure signal. The temperature signal includes: a main steam temperature signal, a condenser temperature signal. The flow rate signal includes: a main steam flow signal, a condenser flow signal.
(2) And judging whether the pressure, temperature and flow signals of the coal-fired generator set have alarm signals.
(3) And if no alarm signal exists, determining that the coal-fired generator set is in a normal operation state.
Namely, if at least one signal has an alarm signal, the coal-fired unit is in an abnormal operation state, the abnormal condition is eliminated firstly, the coal-fired unit is enabled to operate normally, and then the method of the embodiment of the invention is adopted to carry out frequency modulation.
The embodiment of the invention also discloses a computer readable storage medium, wherein the computer readable storage medium is stored with computer program instructions; the computer program instructions, when executed by a processor, implement the primary frequency modulation control method of the hybrid energy storage system according to the above embodiment.
The embodiment of the invention also discloses a primary frequency modulation control system of the hybrid energy storage system, which comprises the following components: a computer readable storage medium as in the above embodiments.
In summary, according to the embodiment of the invention, the state of the flywheel energy storage array is adjusted according to the unit operation load interval, the primary frequency modulation capability of the unit is improved, the frequency modulation amount is ensured, the frequent actions of the high-regulating gate of the coal-fired generator set are reduced, the power fluctuation caused by the step action of the high-regulating gate of the coal-fired generator set is reduced, the coal consumption of the coal-fired generator set is reduced, and the utilization rate of the flywheel energy storage array is improved.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A primary frequency modulation control method of a hybrid energy storage system is characterized by comprising the following steps:
determining the current adjusting capacity of the coal-fired power generating unit under the normal operation state, wherein the adjusting capacity comprises the following steps: an upward adjustment capability and a downward adjustment capability;
calculating to obtain the load regulation power required by the power grid according to the obtained current actual frequency deviation of the power grid;
and controlling the rotating speed of the flywheel energy storage array according to the type of the adjusting capacity of the coal-fired generator set, and controlling the flywheel energy storage array to perform primary frequency modulation according to the load adjusting power.
2. The primary frequency modulation control method of the hybrid energy storage system according to claim 1, wherein before the step of determining the adjustment capability currently provided by the coal-fired power generation unit in the normal operation state, the method comprises:
and determining the current load of the coal-fired generator set and the opening degree of the current high-regulating-valve feedback signal.
3. The primary frequency modulation control method of the hybrid energy storage system according to claim 2, wherein the step of determining the current adjustment capability of the coal-fired power generation unit in the normal operation state comprises:
if the current load of the coal-fired generator set is the maximum load and the opening of the current high throttle feedback signal is larger than a first preset opening, determining that the coal-fired generator set does not have upward adjusting capacity currently;
if the current load of the coal-fired generator set is a stable combustion load and the opening of the current high throttle feedback signal is smaller than a second preset opening, determining that the coal-fired generator set does not have downward regulation capability currently;
and if the current load of the coal-fired generator set is smaller than the maximum load and larger than the stable combustion load, and the opening degree of the current high throttle feedback signal is not larger than the first preset opening degree and not smaller than the second preset opening degree, determining that the coal-fired generator set currently has upward adjusting capacity and downward adjusting capacity.
4. The primary frequency modulation control method of the hybrid energy storage system according to claim 1, wherein the step of controlling the flywheel energy storage array to perform primary frequency modulation according to the load regulation power comprises:
if the coal-fired generator set does not have upward adjustment capability currently, controlling the rotating speed of the flywheel energy storage array to be the maximum rotating speed, and enabling the flywheel energy storage array to discharge according to the discharging power as the absolute value of the load power adjustment;
if the coal-fired generator set does not have downward regulation capability at present, controlling the rotating speed of the flywheel energy storage array to be the minimum rotating speed, and enabling the flywheel energy storage array to be charged according to the absolute value of the load regulation power of the charging power;
and if the coal-fired generator set currently has upward adjustment capability and downward adjustment capability, controlling the rotating speed of the flywheel energy storage array to be an intermediate rotating speed, and controlling the flywheel energy storage array to perform charging and discharging based on the positive and negative properties of the current actual frequency deviation according to the magnitude relation between the maximum frequency deviation provided by the flywheel energy storage array and the absolute value of the current actual frequency deviation, wherein the intermediate rotating speed is less than the maximum rotating speed of the flywheel energy storage array and greater than the minimum rotating speed of the flywheel energy storage array.
5. The primary frequency modulation control method of a hybrid energy storage system according to claim 4, wherein the step of controlling the flywheel energy storage array to perform charging and discharging based on the positive and negative characteristics of the current actual frequency deviation according to the magnitude relationship between the maximum frequency deviation that can be provided by the flywheel energy storage array and the absolute value of the current actual frequency deviation comprises:
if the absolute value of the current actual frequency deviation is not larger than the maximum frequency deviation provided by the flywheel energy storage array, and the current actual frequency deviation is negative, controlling the flywheel energy storage array to discharge according to the absolute value of the load regulation power of the discharge power;
if the absolute value of the current actual frequency deviation is not larger than the maximum frequency deviation provided by the flywheel energy storage array, and the current actual frequency deviation is positive, controlling the flywheel energy storage array to charge the absolute value of the load adjusting power according to the charging power;
if the absolute value of the current actual frequency deviation is larger than the maximum frequency deviation which can be provided by the flywheel energy storage array, and the current actual frequency deviation is negative, controlling the flywheel energy storage array to discharge according to the discharge power corresponding to the maximum frequency deviation which can be provided by the flywheel energy storage array, and controlling the coal-fired power generator set to increase the output power of the coal-fired power generator set according to the power corresponding to the difference value of the absolute value of the current actual frequency deviation and the maximum frequency deviation which can be provided by the flywheel energy storage array;
and if the absolute value of the current actual frequency deviation is greater than the maximum frequency deviation provided by the flywheel energy storage array, and the current actual frequency deviation is positive, controlling the flywheel energy storage array to charge according to the charging amount corresponding to the maximum frequency deviation provided by the flywheel energy storage array, and controlling the coal-fired power generator set to reduce the output power of the coal-fired power generator set according to the difference between the absolute value of the current actual frequency deviation and the maximum frequency deviation provided by the flywheel energy storage array.
6. The primary frequency modulation control method of the hybrid energy storage system according to claim 1, further comprising:
and multiplying the historical frequency deviation with the maximum occurrence frequency in the historical frequency deviations in the preset historical time period by a preset percentage to obtain the maximum frequency deviation provided by the flywheel energy storage array.
7. The primary frequency modulation control method of the hybrid energy storage system according to claim 1, wherein the load regulation power required by the power grid is calculated by the following formula:
where Δ p represents the load regulation power, and Δ f representsActual frequency deviation, Δ f = f-f d F denotes the detected frequency deviation of the network, f d Representing the dead zone frequency of the coal-fired power generating unit, delta representing the rotational speed inequality rate of the coal-fired power generating unit, p n Representing the rated power of the coal-fired power unit.
8. The primary frequency modulation control method of the hybrid energy storage system according to claim 1, wherein before the step of determining the adjustment capability currently provided by the coal-fired power generation unit in the normal operation state, the method comprises:
collecting pressure, temperature and flow signals of the coal-fired generator set;
judging whether the pressure, temperature and flow signals of the coal-fired generator set have alarm signals or not;
and if no alarm signal exists, determining that the coal-fired generator set is in a normal operation state.
9. A computer-readable storage medium characterized by: the computer readable storage medium having stored thereon computer program instructions; the computer program instructions, when executed by a processor, implement a hybrid energy storage system primary frequency modulation control method as claimed in any one of claims 1 to 8.
10. The utility model provides a mix energy storage system primary control system, its characterized in that includes: the computer readable storage medium of claim 9.
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| CN116454937A (en) * | 2023-06-12 | 2023-07-18 | 国电投坎德拉(北京)新能源科技有限公司 | Control method, system, controller and medium of grid-connected power generation system |
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| CN116454937B (en) * | 2023-06-12 | 2024-01-09 | 国电投坎德拉(北京)新能源科技有限公司 | Control method, system, controller and medium of grid-connected power generation system |
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