CN113193570B - Photovoltaic primary frequency modulation power control method and device considering light intensity and operating characteristics - Google Patents

Photovoltaic primary frequency modulation power control method and device considering light intensity and operating characteristics Download PDF

Info

Publication number
CN113193570B
CN113193570B CN202110449593.XA CN202110449593A CN113193570B CN 113193570 B CN113193570 B CN 113193570B CN 202110449593 A CN202110449593 A CN 202110449593A CN 113193570 B CN113193570 B CN 113193570B
Authority
CN
China
Prior art keywords
photovoltaic
power
frequency modulation
light intensity
station
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN202110449593.XA
Other languages
Chinese (zh)
Other versions
CN113193570A (en
Inventor
秦亮
刘钊汛
王庆
刘开培
吴鹏飞
刘博�
杨鹏程
宋胜利
韩谷静
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
State Grid Corp of China SGCC
Wuhan University WHU
Global Energy Interconnection Research Institute
Wuhan Textile University
Original Assignee
State Grid Corp of China SGCC
Wuhan University WHU
Global Energy Interconnection Research Institute
Wuhan Textile University
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by State Grid Corp of China SGCC, Wuhan University WHU, Global Energy Interconnection Research Institute, Wuhan Textile University filed Critical State Grid Corp of China SGCC
Priority to CN202110449593.XA priority Critical patent/CN113193570B/en
Publication of CN113193570A publication Critical patent/CN113193570A/en
Application granted granted Critical
Publication of CN113193570B publication Critical patent/CN113193570B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • 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
    • H02J3/241—The oscillation concerning frequency

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Supply And Distribution Of Alternating Current (AREA)
  • Photovoltaic Devices (AREA)

Abstract

The invention provides a photovoltaic primary frequency modulation power control method considering light intensity and operating characteristics. According to the method, light intensity and photovoltaic operation characteristics are considered on the basis that photovoltaic power generation participates in primary frequency modulation of a system, additional power control is set for different stations before secondary frequency modulation of a system synchronization unit, power output curves of the stations are determined by combining with photovoltaic primary frequency modulation droop characteristics, and the power output curves are sent to the stations to be controlled. And after the secondary frequency modulation action of the system synchronization unit, the additional power control is quitted, and the frequency modulation is completed. According to the invention, power control is added on the basis that the photovoltaic participates in the primary frequency modulation, so that the condition that the frequency deviation is over-limited in the first swing period in the primary frequency modulation process is effectively improved, and the dynamic stability of the system is improved; the additional power control considers the light intensity and the photovoltaic operation characteristics, the output of each photovoltaic station is reasonably distributed in the primary frequency modulation process, the volatilization and frequency modulation capacity of each photovoltaic station is fully distributed, and the control precision is improved.

Description

Photovoltaic primary frequency modulation power control method and device considering light intensity and operating characteristics
Technical Field
The application relates to the field of photovoltaic power generation primary frequency modulation, in particular to a photovoltaic primary frequency modulation power control method considering illumination intensity and operating characteristics.
Background
Photovoltaic power generation is rapidly developed in recent years due to the advantages of abundant reserves, high cost benefit, cleanness and environmental protection, and grid-connected capacity is continuously increased. However, the photovoltaic power generation system as a static element lacks rotational inertia, is generally in a maximum power tracking mode, and does not participate in system frequency modulation. With the access of large-scale photovoltaic power, the proportion of a conventional generator set in a power system is reduced, the inertia of the power system is reduced, and the frequency modulation capability of the power system and the capability of coping with power shortage and frequency fluctuation are weakened to a certain extent. In order to reduce the risk of safe operation of the power system, the photovoltaic unit is required to have frequency modulation capability.
In the prior art, the characteristic of frequency droop, that is, the frequency deviation of a grid-connected point is used as a control quantity, the power of part of photovoltaic power generation units is directly adjusted to participate in frequency modulation, and the power variation is generally evenly distributed to each unit. However, the maximum power that each photovoltaic cell can output is greatly influenced by the illumination conditions and by the differences of the power generation characteristics, the positions of the photovoltaic cell panels, the characteristics of the inverters and the like, and the power generation capacities of the photovoltaic stations are different. The conventionally adopted average distribution strategy is that a control target value is obtained according to the installed capacity proportion distribution of the photovoltaic field station, the operation characteristics, the adjustment allowance and the speed of the photovoltaic are not considered, and the potential of the photovoltaic with different power generation capacities participating in frequency adjustment cannot be fully exerted. In addition, in the process of the photovoltaic participating in the primary frequency modulation, if the primary frequency modulation capability of the system is insufficient, the frequency deviation cannot be limited within an allowable range, so that the normal operation of the power system is seriously damaged.
Therefore, it is desirable to provide a method of photovoltaic primary frequency modulation power control that takes into account light intensity and operating characteristics.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a photovoltaic primary frequency modulation power control method considering light intensity and operating characteristics, which can fully play the potential of each photovoltaic station participating in frequency modulation under the condition of considering the operating characteristics and the light intensity of the photovoltaic stations and improve the stability and the good transient response of a system.
In order to achieve the above object, the present invention provides a method for controlling a photovoltaic primary frequency modulation power considering light intensity and operation characteristics, comprising the following steps:
step 1: collecting light intensity and operating characteristics of each photovoltaic station;
step 2: calculating the regulation rate of each photovoltaic station according to the light intensity of each photovoltaic station to obtain the power increment of the primary frequency modulation corresponding to each photovoltaic station and the power increment of the primary frequency modulation of the jth photovoltaic station
Figure BDA0003038229490000021
Figure BDA0003038229490000022
Wherein alpha is a photovoltaic power coefficient and a regulation rate characteristic constant, lambda is a photovoltaic power regulation rate-light intensity characteristic constant, epsilonjIs the photovoltaic cell characteristic of the jth photovoltaic station, SjIs the light intensity at which the jth photovoltaic field station is located, f NF is the power frequency constant of the power system, and f is the collected power system frequency;
and 3, step 3: according to the sum of the light intensity of each photovoltaic stationOperating characteristics, calculating the adjusting capacity of the photovoltaic stations to obtain the power increment of the additional power control corresponding to each photovoltaic station, wherein the power increment of the jth photovoltaic station based on the additional power control of the primary frequency modulation
Figure BDA0003038229490000023
Comprises the following steps:
Figure BDA0003038229490000024
wherein: beta is a photovoltaic additional power control coefficient-regulating capacity characteristic constant;
Figure BDA0003038229490000025
the maximum power which can be emitted by the jth photovoltaic station under the current light intensity is obtained; pjIs the current output power of the jth photovoltaic station, fNThe power frequency of the power system is 50Hz, and f is the collected power system frequency;
and 4, step 4: after a control period T, the additional power of the jth photovoltaic station is controlled to increase the power
Figure BDA0003038229490000026
Power increment in combination with primary frequency modulation
Figure BDA0003038229490000027
And the current output power PjDetermining that the active output reference value of the photovoltaic station is as follows:
Figure BDA0003038229490000028
conveying the photovoltaic power to each photovoltaic station for control;
and 5: detecting whether each photovoltaic station receives a secondary frequency modulation action instruction: if the secondary frequency modulation action instruction is not received, setting the power frequency static characteristic coefficient and the additional power control coefficient corresponding to each photovoltaic station again according to the operating characteristics and the light intensity of the photovoltaic station to form an active output reference value of the next control period; if a secondary frequency modulation action instruction is received, the photovoltaic fields are quitted step by step Additional power control of the station, power increment of additional power control of each photovoltaic field station
Figure BDA0003038229490000029
And then the frequency is reduced to zero, and the additional power control integrator is reset to complete the frequency modulation operation.
Preferably, the step 1 specifically comprises the following steps:
step 1.1: acquiring light intensity parameter data, and according to the output characteristics of the photovoltaic cell:
Figure BDA00030382294900000210
obtaining the maximum output of each photovoltaic station
Figure BDA00030382294900000211
Wherein:
Figure BDA00030382294900000212
the maximum power (MW) which can be output by the jth photovoltaic station under the current light intensity; n is the number of photovoltaic stations;
step 1.2: obtaining the current output P (t) ═ P of the photovoltaic station1(t) P2(t) … Pj(t) … Pn(t)]
Wherein: pj(t) is the current contribution (MW) of the jth photovoltaic yard; and n is the number of the photovoltaic stations.
Preferably, the step 2 specifically comprises the following steps:
step 2.1: the power regulation rate of the photovoltaic station is related to light intensity and inverter parameters, and the higher the light intensity is, the faster the power regulation rate is; under the condition that the characteristics of the inverters are the same, the characteristic curve is regarded as the slope value of a photovoltaic power generation P-V characteristic curve and is in direct proportion to the light intensity; therefore, the power regulation rate of each photovoltaic station can be calculated as follows:
Figure BDA0003038229490000031
wherein:
Figure BDA0003038229490000032
adjusting the power regulation rate of the jth photovoltaic station under the current light intensity; sjThe light intensity of the jth photovoltaic station; lambda is the photovoltaic power regulation rate and the light intensity characteristic constant; epsilon jA photovoltaic cell characteristic for the jth photovoltaic farm;
step 2.2: according to the frequency regulation condition of the photovoltaic field station under different light intensities, the corresponding power frequency static characteristic coefficient is set according to the regulation rate which can be output by the photovoltaic field station at the current light intensity:
Figure BDA0003038229490000033
wherein: alpha is a photovoltaic power frequency coefficient-regulation rate characteristic constant;
step 2.3: setting the primary frequency modulation P-f power frequency static characteristics of each photovoltaic station as follows:
Figure BDA0003038229490000034
wherein: kP-jAnd the power frequency static characteristic coefficient is corresponding to the jth photovoltaic station.
Preferably, the step 3 specifically includes the following steps:
step 3.1: calculating the power regulation capacity of each photovoltaic station according to the operating characteristics of the photovoltaic station in the step 1 and the maximum power under the light intensity:
Figure BDA0003038229490000035
wherein:
Figure BDA0003038229490000036
for the jth photovoltaic fieldPower regulation capacity standing at the current light intensity.
Step 3.2: in order to fully exert the participation frequency regulation potential of the photovoltaic stations under different light intensities, the corresponding additional power control coefficients are set according to the power regulation capacity which can be output by the photovoltaic stations under the current light intensity:
Figure BDA0003038229490000037
wherein: beta is a photovoltaic additional power control coefficient-regulating capacity characteristic constant;
step 3.3: setting the additional power control of each photovoltaic station based on primary frequency modulation as follows:
Figure BDA0003038229490000038
Wherein: k isI-jAnd the additional power control coefficient corresponds to the jth photovoltaic field station.
Preferably, the step 4 specifically comprises the following steps:
step 4.1: the photovoltaic additional power control and the primary frequency modulation droop control are combined to form an active output reference value of each photovoltaic station:
Figure BDA0003038229490000041
wherein: pref-jAn active output reference value of a jth photovoltaic station in a control period T;
step 4.2: and setting the length of a control period as T, wherein in the control period T, the power frequency static characteristic coefficient and the additional power control coefficient corresponding to each photovoltaic field station are not changed, and each photovoltaic field station outputs power to the power grid according to the respective active output reference value.
Preferably, the step 5 specifically includes the following steps:
step 5.1: detecting whether each photovoltaic station receives a secondary frequency modulation action instruction;
step 5.2: if the secondary frequency modulation action instruction is not received, repeating the steps 1-4, and setting the power frequency static characteristic coefficient and the additional power control coefficient corresponding to each photovoltaic station again according to the operating characteristics and the light intensity of the photovoltaic station to form a power output curve of the next control period;
step 5.3: if a secondary frequency modulation action instruction is received, the additional power control of each photovoltaic station is quitted step by step, and the power increment of the additional power control of each photovoltaic station is increased
Figure BDA0003038229490000042
Reducing to zero:
Pref-j(t+t0)＝Kquit(t+t0)×Pref-j(t0)
wherein: p isref-j(t0) The active output reference value is the active output reference value when the jth photovoltaic station receives a secondary frequency modulation command of the system; p isref-j(t+t0) The active output reference value is the active output reference value after the jth photovoltaic station receives the secondary frequency modulation instruction of the system; kquit(t+t0) For exiting the coefficient, the coefficient is gradually reduced from 1 to 0 when a system secondary frequency modulation command is received;
thus, the additional power control is exited, and then the additional power control integrator is reset to complete the frequency modulation operation.
In a second aspect of the present invention, there is provided a control apparatus using the aforementioned photovoltaic primary frequency modulation power control method considering light intensity and operation characteristics, comprising: the information acquisition module is used for acquiring the light intensity, the operating characteristics and the system frequency of each photovoltaic station; the parameter calculation module is used for calculating the power frequency static characteristic coefficient and the additional power control coefficient of each photovoltaic station so as to obtain the power increment of primary frequency modulation and additional power control corresponding to each photovoltaic station; the instruction receiving and judging module is used for receiving a secondary frequency modulation action instruction from the system and judging whether to quit the additional power control; and the additional power control exit module has the function of exiting the additional power control of the photovoltaic station step by step, so that the secondary disturbance of the system caused by the step exit is avoided.
Compared with the prior art, the invention has the beneficial effects that:
(1) the power control is added on the basis that the photovoltaic participates in the primary frequency modulation, so that the condition that the frequency deviation is over-limited in the first swing period in the primary frequency modulation process is effectively improved, and the dynamic stability of the system is improved;
(2) the additional power control comprehensively considers the light intensity and the photovoltaic operating characteristics, and the output of each photovoltaic station is reasonably distributed according to the power regulation allowance and the power regulation speed of each photovoltaic station under the current light intensity in the primary frequency modulation process, so that the photovoltaic station has the ability of distributing volatile and frequency modulation, and the control precision is improved.
Drawings
FIG. 1 is a flow chart of a photovoltaic primary frequency modulation power control method considering light intensity and operation characteristics according to the present invention;
FIG. 2 is a schematic diagram of a power curve for each photovoltaic farm of the present invention;
FIG. 3 is a schematic diagram of the system frequency of the present invention;
fig. 4 is a schematic diagram of a photovoltaic primary frequency modulation power control device according to 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 present application, 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 provides a photovoltaic primary frequency modulation power control method considering illumination intensity and operation characteristics, wherein the technical term illumination intensity is also called light intensity or parameter solar irradiance for describing solar radiation. The photovoltaic primary frequency modulation power control method disclosed by the invention comprises the following specific steps:
step 1: collecting light intensity and operating characteristics of each photovoltaic station;
step 2: calculating the regulation rate of each photovoltaic station according to the light intensity of each photovoltaic station, and further setting a P-f primary frequency modulation droop curve corresponding to each photovoltaic station;
and step 3: calculating the adjusting capacity of each photovoltaic station according to the operating characteristics and the light intensity of each photovoltaic station, and further setting the corresponding additional power control of each photovoltaic station;
and 4, step 4: after a control period T, determining a power output curve of each station by combining the additional power control with the photovoltaic primary frequency modulation droop characteristic and the scheduling instruction, and transmitting the power output curve to each station for control;
and 5: detecting whether the secondary frequency modulation of the system synchronization unit acts: if not, repeating the step 1.4; and if so, quitting the additional power control of each photovoltaic station to complete the frequency modulation task.
The step 1 specifically comprises the following steps:
Step 1.1: acquiring photovoltaic power generation related weather parameters such as illumination intensity and temperature in weather information, and according to the output characteristics of the photovoltaic cells:
Figure BDA0003038229490000061
obtaining the maximum output of each photovoltaic station
Figure BDA0003038229490000062
Wherein:
Figure BDA0003038229490000063
the maximum power (MW) which can be output by the jth photovoltaic field station under the current light intensity; and n is the number of the photovoltaic stations.
Step 1.2: obtaining the current output P (t) ═ P of the photovoltaic station1(t) P2(t) … Pj(t) … Pn(t)]。
Wherein: pj(t) is the current contribution (MW) of the jth photovoltaic yard; and n is the number of the photovoltaic stations.
The step 2 specifically comprises the following steps:
step 2.1: the power regulation rate of the photovoltaic station is related to light intensity and inverter parameters, and the higher the light intensity is, the faster the power regulation rate is. In the case of the same inverter characteristics, the characteristic curve can be roughly regarded as the slope value of the characteristic curve of the photovoltaic power generation P.U and is proportional to the light intensity. Therefore, the power regulation rate of each photovoltaic station can be calculated as follows:
Figure BDA0003038229490000064
wherein:
Figure BDA0003038229490000065
adjusting the power regulation rate of the jth photovoltaic station under the current light intensity; sjThe light intensity of the jth photovoltaic station; lambda is the photovoltaic power regulation rate and the light intensity characteristic constant; epsilonjThe photovoltaic cell characteristic of the jth photovoltaic station.
Step 2.2: setting the primary frequency modulation P-f power frequency static characteristics of each photovoltaic station as follows:
Figure BDA0003038229490000066
Wherein: kP-jAnd the power frequency static characteristic coefficient is corresponding to the jth photovoltaic station.
Step 2.3: in order to fully exert the participating frequency regulation potential of the photovoltaic field station under different light intensities, the corresponding power frequency static characteristic coefficient is set according to the regulation rate which can be output by the photovoltaic field station at the current light intensity:
Figure BDA0003038229490000067
wherein: and alpha is a photovoltaic power frequency coefficient and an adjusting rate characteristic constant.
The step 3 specifically comprises the following steps:
step 3.1: calculating the power regulation capacity of each photovoltaic station according to the operating characteristics of the photovoltaic station in the step 1 and the maximum power under the light intensity:
Figure BDA0003038229490000068
wherein:
Figure BDA0003038229490000069
and adjusting the capacity of the power of the jth photovoltaic field station under the current light intensity.
Step 3.2: setting the additional power control of each photovoltaic station based on primary frequency modulation as follows:
Figure BDA00030382294900000610
wherein: kI-jAnd the additional power control coefficient corresponds to the jth photovoltaic station.
Step 3.3: in order to fully exert the participation frequency regulation potential of the photovoltaic field station under different light intensities, the corresponding additional power control coefficient is set according to the power regulation capacity which can be output by the photovoltaic field station at the current light intensity:
Figure BDA0003038229490000071
wherein: and beta is a photovoltaic additional power control coefficient and a capacity characteristic constant is adjusted.
The step 4 specifically comprises the following steps:
Step 4.1: the photovoltaic additional power control, the primary frequency modulation droop characteristic and the scheduling instruction are combined to form a power output curve of each station:
Figure BDA0003038229490000072
wherein: p isref-jAnd (4) the power output curve of the jth photovoltaic field station in a control period.
And 4.2: the length of one control period is set to be T, and the control period can be manually set. In the control period, the power frequency static characteristic coefficient and the additional power control coefficient corresponding to each photovoltaic station are not changed, and the photovoltaic stations strictly output power to the power grid according to the power output curve.
The step 5 specifically comprises the following steps:
step 5.1: and detecting whether the secondary frequency modulation of the system synchronization unit acts.
And step 5.2: if the secondary frequency modulation is not operated, repeating the steps 1-4. And setting the power frequency static characteristic coefficient and the additional power control coefficient corresponding to each photovoltaic station according to the operating characteristics and the light intensity of the photovoltaic station to form a power output curve of the next control period.
Step 5.3: if the secondary frequency modulation is already operated, the additional power of each photovoltaic station is controlled to output
Figure BDA0003038229490000073
And gradually reducing the frequency to zero, then resetting the additional power control integrator, exiting the additional power control and finishing the frequency modulation work.
A specific embodiment is provided to illustrate a process of obtaining a power curve of each photovoltaic station by using the method of the present invention to achieve a coordinated control effect.
Step 1: the photovoltaic grid-connected system of this embodiment has 1 thermal power plant and 2 photovoltaic stations in total, obtains relevant parameter: the light intensity at the A photovoltaic station is 1000W/m2And the light intensity at the B photovoltaic field station is 600W/m2The temperature was 25 ℃. Therefore, the maximum output power P of 2 photovoltaic stations can be obtainedmax＝[300 170](MW), current output value P ═ 200140](MW)。
Step 2: the inverter parameters of the two photovoltaic stations are the same, and the regulation rates of the two photovoltaic stations are in direct proportion to the light intensity: delta Pspeed＝[60 36](MW/s). Taking photovoltaic power frequency coefficient, adjusting rate characteristic constant alpha to 125, and then the power frequency static characteristic coefficient corresponding to the two photovoltaic stations is KP＝[25 15](p.u.)。
And step 3: calculating the power regulation capacity of the two photovoltaic stations under the current light intensity to be delta Pmargin＝[100 30](MW). Taking a photovoltaic additional power control coefficient, adjusting a capacity characteristic constant beta to 300, and then setting the power frequency static characteristic coefficient corresponding to the two photovoltaic stations to be KI＝[100 30](p.u.)。
And 4, step 4: and combining photovoltaic additional power control with primary frequency modulation droop characteristics and scheduling instructions. The length of one control period is set to be T-5 s.
The primary frequency modulation additional power control power curve diagrams of the two photovoltaic stations are shown in fig. 2, the output curves of the two photovoltaic stations are related to the light intensity of the photovoltaic stations and the operating characteristics of the photovoltaic stations, and the potential of the photovoltaic stations participating in frequency adjustment is fully exerted. In fig. 2, an upper dotted line 1 is the maximum power of the photovoltaic field a, a lower dotted line 2 is the maximum power of the photovoltaic field B, a diamond-shaped line 3 is the output power of the photovoltaic field a, and a square-shaped line 4 is the output power of the photovoltaic field B.
According to the light intensity and the operating characteristics of the two photovoltaic stations in the embodiment, the active power regulation capacity of the photovoltaic station a is large, and the regulation rate is high, so that the change rate and the change amount in the power curve in fig. 2 are higher, that is, the effect in the frequency modulation process is higher, and the potential of the photovoltaic station participating in the frequency regulation is fully exerted.
And 5: detecting whether the secondary frequency modulation of the system synchronization unit acts: and (4) after the action, quitting the additional power control and completing the frequency modulation task.
As shown in the system frequency graph of fig. 3, a solid line 5 shows a system frequency change curve after power control is added, and a dotted line 6 shows a system frequency change curve without power control added. When the additional power control is not set, the photovoltaic primary frequency modulation is only used before a system secondary frequency modulation instruction is issued, the system frequency belongs to difference frequency modulation, and the system frequency is finally stabilized at 49.8 Hz; when the additional power is set, as shown by the solid line 5, the photovoltaic primary frequency modulation and the additional power are simultaneously input, and the system frequency is quickly recovered to 50 Hz. Therefore, compared with a system without additional power control, the system frequency fluctuation amplitude after the additional power control is obviously smaller, and the system stability is effectively improved.
Fig. 4 is a schematic diagram of a photovoltaic primary frequency modulation power control device according to the present invention. The control device comprises an information acquisition module which is used for acquiring the light intensity, the operating characteristics and the system frequency of each photovoltaic station; the parameter calculation module is used for calculating the power frequency static characteristic coefficient and the additional power control coefficient of each photovoltaic station so as to obtain the power increment of primary frequency modulation and additional power control corresponding to each photovoltaic station; the instruction receiving and judging module is used for receiving a secondary frequency modulation action instruction from the system and judging whether to quit the additional power control; and the additional power control exit module has the function of exiting the additional power control of the photovoltaic station step by step, so that the secondary disturbance of the system caused by the step exit is avoided.
The information acquisition module acquires the light intensity, the operating characteristics and the system frequency of each photovoltaic station; the parameter calculation module calculates a power frequency static characteristic coefficient and an additional power control coefficient of each photovoltaic station according to the light intensity and the operation characteristic obtained by the information acquisition module, so that power increment of primary frequency modulation and additional power control corresponding to each photovoltaic station is obtained; then the instruction receiving and judging module receives a secondary frequency modulation action instruction from the system and judges whether to quit the additional power control: if the secondary frequency modulation action instruction is not received, the information acquisition module acquires relevant information again to control the next control period; and if a secondary frequency modulation action instruction is received, entering an additional power control exit module, and exiting the additional power control of the photovoltaic station step by step.
According to the invention, power control is added on the basis that the photovoltaic participates in the primary frequency modulation, as shown in fig. 3, compared with the case of no power control after the power control is added, the situation that the frequency deviation is over-limited in the first swing period in the primary frequency modulation process is effectively improved, and the dynamic stability of the system is improved; the additional power control considers the light intensity and the photovoltaic operation characteristics, as shown in fig. 2, the output of each photovoltaic station in the primary frequency modulation process is reasonably distributed, the photovoltaic stations with large active power regulation capacity and high regulation rate bear more frequency modulation tasks in the frequency modulation process, the power generation and frequency modulation capacity of each photovoltaic station is fully exerted, and the control precision is improved.
In the description of the specification, reference to the description of "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The embodiments of the present invention have been described above. However, the present invention is not limited to the above embodiment. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (6)

1. A photovoltaic primary frequency modulation power control method considering light intensity and operation characteristics is characterized by comprising the following steps:
step 1: collecting light intensity and operating characteristics of each photovoltaic station;
step 2: calculating the regulation rate of each photovoltaic station according to the light intensity of each photovoltaic station to obtain the power increment of the primary frequency modulation corresponding to each photovoltaic station and the power increment of the primary frequency modulation of the jth photovoltaic station
Figure FDA0003612059280000011
Figure FDA0003612059280000012
Wherein alpha is a photovoltaic power coefficient-regulation rate characteristic constant, lambda is a photovoltaic power regulation rate-light intensity characteristic constant, epsilonjIs the photovoltaic cell characteristic of the jth photovoltaic station, SjIs the light intensity at the jth photovoltaic field, fNF is the power frequency constant of the power system, and f is the collected power system frequency;
and 3, step 3: calculating the adjusting capacity of the photovoltaic station according to the light intensity and the operating characteristics of each photovoltaic station to obtain the power of the additional power control corresponding to each photovoltaic stationIncrement, additional power control power increment based on primary frequency modulation for jth photovoltaic station
Figure FDA0003612059280000013
Comprises the following steps:
Figure FDA0003612059280000014
wherein: beta is a photovoltaic additional power control coefficient-regulating capacity characteristic constant;
Figure FDA0003612059280000015
the maximum power which can be emitted by the jth photovoltaic station under the current light intensity is obtained; pjIs the current output power of the jth photovoltaic station, fNThe power frequency of the power system is 50Hz, and f is the collected power system frequency;
and 4, step 4: after a control period T, the additional power of the jth photovoltaic station is controlled to increase the power
Figure FDA0003612059280000016
Power increment in combination with primary frequency modulation
Figure FDA0003612059280000017
And the current output power PjDetermining that the active output reference value of the photovoltaic station is as follows:
Figure FDA0003612059280000018
conveying the photovoltaic power to each photovoltaic station for control;
and 5: detecting whether each photovoltaic station receives a secondary frequency modulation action instruction: if the secondary frequency modulation action instruction is not received, setting the power frequency static characteristic coefficient and the additional power control coefficient corresponding to each photovoltaic station again according to the operating characteristics and the light intensity of the photovoltaic station to form an active output reference value of the next control period; if a secondary frequency modulation action instruction is received, gradually quitting the additional power control of each photovoltaic station, and enabling each photovoltaic station to be connected Power increment for photovoltaic farm parasitic power control
Figure FDA0003612059280000019
And then the frequency is reduced to zero, and the additional power control integrator is reset to complete the frequency modulation operation.
2. The photovoltaic primary frequency modulation power control method considering light intensity and operating characteristics according to claim 1, wherein the step 1 specifically comprises the following steps:
step 1.1: acquiring light intensity parameter data, and according to the output characteristics of the photovoltaic cell:
Figure FDA00036120592800000110
obtaining the maximum output of each photovoltaic station
Figure FDA0003612059280000021
Wherein:
Figure FDA0003612059280000022
the maximum power (MW) which can be output by the jth photovoltaic station under the current light intensity; n is the number of photovoltaic stations;
step 1.2: obtaining the current output P (t) ═ P of the photovoltaic station1(t) P2(t)…Pj(t)…Pn(t)]
Wherein: pj(t) is the current contribution (MW) of the jth photovoltaic yard; and n is the number of the photovoltaic stations.
3. The photovoltaic primary frequency modulation power control method considering light intensity and operation characteristics according to claim 1, wherein the step 2 specifically comprises the following steps:
step 2.1: the power regulation rate of the photovoltaic station is related to light intensity and inverter parameters, and the higher the light intensity is, the faster the power regulation rate is; under the condition that the characteristics of the inverters are the same, the characteristic curve is regarded as the slope value of a photovoltaic power generation P-V characteristic curve and is in direct proportion to the light intensity; therefore, the power regulation rate of each photovoltaic station can be calculated as follows:
Figure FDA0003612059280000023
Wherein:
Figure FDA0003612059280000024
adjusting the power regulation rate of the jth photovoltaic field station under the current light intensity; s. thejThe light intensity of the jth photovoltaic station; lambda is a photovoltaic power regulation rate-light intensity characteristic constant; epsilonjThe photovoltaic cell characteristic of the jth photovoltaic station;
step 2.2: according to the frequency regulation condition of the photovoltaic stations under different light intensities, the corresponding power frequency static characteristic coefficient is set according to the regulation rate which can be output by the photovoltaic stations at the current light intensity:
Figure FDA0003612059280000025
wherein: alpha is a photovoltaic power frequency coefficient-regulation rate characteristic constant;
step 2.3: setting the primary frequency modulation P-f power frequency static characteristics of each photovoltaic station as follows:
Figure FDA0003612059280000026
wherein: kP-jAnd the power frequency static characteristic coefficient is corresponding to the jth photovoltaic station.
4. The photovoltaic primary frequency modulation power control method considering light intensity and operation characteristics as claimed in claim 2, wherein the step 3 specifically comprises the following steps:
step 3.1: calculating the power regulation capacity of each photovoltaic station according to the operating characteristics of the photovoltaic station in the step 1 and the maximum power under the light intensity:
Figure FDA0003612059280000027
wherein:
Figure FDA0003612059280000028
adjusting the capacity for the power of the jth photovoltaic station under the current light intensity;
step 3.2: in order to fully exert the participation frequency regulation potential of the photovoltaic stations under different light intensities, the corresponding additional power control coefficients are set according to the power regulation capacity which can be output by the photovoltaic stations under the current light intensity:
Figure FDA0003612059280000031
Wherein: beta is a photovoltaic additional power control coefficient-regulating capacity characteristic constant;
step 3.3: and setting the additional power control of each photovoltaic station based on primary frequency modulation as follows:
Figure FDA0003612059280000032
wherein: k isI-jAnd the additional power control coefficient corresponds to the jth photovoltaic field station.
5. The photovoltaic primary frequency modulation power control method considering light intensity and operation characteristics as claimed in claim 1, wherein the step 5 specifically comprises the following steps:
step 5.1: detecting whether each photovoltaic station receives a secondary frequency modulation action instruction;
step 5.2: if the secondary frequency modulation action instruction is not received, repeating the steps 1-4, and setting the power frequency static characteristic coefficient and the additional power control coefficient corresponding to each photovoltaic station again according to the operating characteristics and the light intensity of the photovoltaic station to form a power output curve of the next control period;
step 5.3: if a secondary frequency modulation action instruction is received, gradually quitting the additional power control of each photovoltaic station, and increasing the power of the additional power control of each photovoltaic station
Figure FDA0003612059280000033
Reducing to zero:
Pref-j(t+t0)＝Kquit(t+t0)×Pref-j(t0)
wherein: pref-j(t0) The active output reference value is the active output reference value when the jth photovoltaic station receives a secondary frequency modulation instruction of the system; pref-j(t+t0) The active output reference value is the active output reference value after the jth photovoltaic station receives the secondary frequency modulation instruction of the system; k quit(t+t0) For exiting the coefficient, the coefficient is gradually reduced from 1 to 0 when a system secondary frequency modulation command is received;
thus, the additional power control is exited, and then the additional power control integrator is reset to complete the frequency modulation operation.
6. A control apparatus using the photovoltaic primary frequency modulation power control method considering light intensity and operation characteristics according to any one of claims 1 to 5, characterized by comprising:
the information acquisition module is used for acquiring the light intensity, the operating characteristics and the system frequency of each photovoltaic station;
the parameter calculation module is used for calculating the power frequency static characteristic coefficient and the additional power control coefficient of each photovoltaic station so as to obtain the power increment of primary frequency modulation and additional power control corresponding to each photovoltaic station;
the instruction receiving and judging module is used for receiving a secondary frequency modulation action instruction from the system and judging whether to quit the additional power control;
and the additional power control exit module has the function of exiting the additional power control of the photovoltaic station step by step, so that the secondary disturbance of the system caused by the step exit is avoided.
CN202110449593.XA 2021-04-25 2021-04-25 Photovoltaic primary frequency modulation power control method and device considering light intensity and operating characteristics Active CN113193570B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202110449593.XA CN113193570B (en) 2021-04-25 2021-04-25 Photovoltaic primary frequency modulation power control method and device considering light intensity and operating characteristics

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202110449593.XA CN113193570B (en) 2021-04-25 2021-04-25 Photovoltaic primary frequency modulation power control method and device considering light intensity and operating characteristics

Publications (2)

Publication Number Publication Date
CN113193570A CN113193570A (en) 2021-07-30
CN113193570B true CN113193570B (en) 2022-06-28

Family

ID=76978744

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202110449593.XA Active CN113193570B (en) 2021-04-25 2021-04-25 Photovoltaic primary frequency modulation power control method and device considering light intensity and operating characteristics

Country Status (1)

Country Link
CN (1) CN113193570B (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114156952B (en) * 2021-12-14 2023-08-11 广西大学 Independent power system frequency control method and system based on cooperative control

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107769234A (en) * 2017-11-27 2018-03-06 国网河南省电力公司电力科学研究院 The fm capacity evaluation method of distributed power source is coordinated in a kind of multiple spot energy storage
CN108039740A (en) * 2017-12-20 2018-05-15 北京四方继保自动化股份有限公司 A kind of photovoltaic plant participates in the control system and implementation method of primary frequency modulation

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108054770B (en) * 2017-12-31 2019-04-23 北京金风科创风电设备有限公司 Photovoltaic power plant and primary frequency modulation control method thereof

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107769234A (en) * 2017-11-27 2018-03-06 国网河南省电力公司电力科学研究院 The fm capacity evaluation method of distributed power source is coordinated in a kind of multiple spot energy storage
CN108039740A (en) * 2017-12-20 2018-05-15 北京四方继保自动化股份有限公司 A kind of photovoltaic plant participates in the control system and implementation method of primary frequency modulation

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
Emil DvorskýLenka Raková;Pavla Hejtmánková.Primary and secondary frequency regulation with photovoltaic generators.《2015 16th International Scientific Conference on Electric Power Engineering (EPE)》.2015, *
并网光伏电站的一次调频特性分析;吴俊鹏 等;《电测与仪表》;20160925;第88-92页 *

Also Published As

Publication number Publication date
CN113193570A (en) 2021-07-30

Similar Documents

Publication Publication Date Title
CN109861242B (en) Power coordination control method and system for wind power participating in primary frequency modulation of power grid
CN110768273B (en) Control method for energy storage combined thermal power participation power grid secondary frequency modulation
CN109494811A (en) A kind of wind power plant unit participates in the Poewr control method and system of frequency modulation and voltage modulation
CN110581571A (en) dynamic optimization scheduling method for active power distribution network
CN105762838B (en) A kind of wind-powered electricity generation cluster reactive voltage multi objective control method
CN105656034B (en) The emulation modelling method of isolated island micro-capacitance sensor frequency control
CN111416365B (en) Asynchronous collaborative optimal AGC control system for wind power plant and conventional frequency modulation unit
CN112994038B (en) New energy primary frequency modulation control method, system and device
CN105896617B (en) It is a kind of meter and the active active control of wind turbine wind-powered electricity generation adjust spare capacity appraisal procedure
CN108711868A (en) It is a kind of meter and islet operation voltage security GA for reactive power optimization planing method
CN114336678A (en) PMU-based wind and light storage station primary frequency modulation control method
CN108123494A (en) Double-fed wind turbine based on optimized rotating speed powerinjected method participates in power grid frequency modulation control method
CN113193570B (en) Photovoltaic primary frequency modulation power control method and device considering light intensity and operating characteristics
CN112332421A (en) Photovoltaic power station participation power grid voltage regulation method based on adaptive droop control
CN113991706B (en) Active support type photovoltaic power station integrated power control system and method
US12062920B2 (en) Counter-solar power plant
CN113809760A (en) Control method and device for wind power plant participating in secondary frequency modulation of power grid
CN115549216B (en) Active-reactive coordination control method and system for wind-solar energy storage station
CN108718093B (en) Active-reactive coordination control method for high energy-carrying load participating in wind power consumption
CN114123248B (en) Power grid frequency modulation operation control method and system using new energy primary frequency modulation priority
CN114884049A (en) Optimized operation control method for flexible direct-current power distribution network
US20230223760A1 (en) Hybrid power plant fast frequency response
CN112332463B (en) Active control method and system for improving AGC control performance of wind power plant
CN113162072B (en) Variable droop coefficient control method based on operating characteristics and illumination intensity of photovoltaic power station
CN112260306A (en) New energy power station equipartition group control power generation control method and device

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant