CN112882496A - Improved photovoltaic system angle adjusting method - Google Patents

Improved photovoltaic system angle adjusting method Download PDF

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Publication number
CN112882496A
CN112882496A CN202110083145.2A CN202110083145A CN112882496A CN 112882496 A CN112882496 A CN 112882496A CN 202110083145 A CN202110083145 A CN 202110083145A CN 112882496 A CN112882496 A CN 112882496A
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photovoltaic module
theta
time
angle
period
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CN112882496B (en
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李潇潇
王志喜
陈姝
田巍
邢佳
丁一峰
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Liaoning Solar Energy R & D Co ltd
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Liaoning Solar Energy R & D Co ltd
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    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D3/00—Control of position or direction
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D3/00—Control of position or direction
    • G05D3/10—Control of position or direction without using feedback
    • G05D3/105—Solar tracker
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D3/00—Control of position or direction
    • G05D3/12—Control of position or direction using feedback
    • 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
    • H02J3/28—Arrangements for balancing of the load in a network by storage of energy
    • H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
    • 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
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/381—Dispersed generators
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
    • H02S40/00—Components or accessories in combination with PV modules, not provided for in groups H02S10/00 - H02S30/00
    • H02S40/30—Electrical components
    • 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
    • H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
    • H02J2300/20—The dispersed energy generation being of renewable origin
    • H02J2300/22—The renewable source being solar energy
    • H02J2300/24—The renewable source being solar energy of photovoltaic origin
    • 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
    • H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
    • H02J2300/20—The dispersed energy generation being of renewable origin
    • H02J2300/22—The renewable source being solar energy
    • H02J2300/24—The renewable source being solar energy of photovoltaic origin
    • H02J2300/26—The renewable source being solar energy of photovoltaic origin involving maximum power point tracking control for photovoltaic sources
    • 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
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy
    • Y02E10/56—Power conversion systems, e.g. maximum power point trackers
    • 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
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E70/00—Other energy conversion or management systems reducing GHG emissions
    • Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Automation & Control Theory (AREA)
  • Power Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Photovoltaic Devices (AREA)

Abstract

An improved photovoltaic system angle adjusting method belongs to the technical field of solar photovoltaic power generation, and particularly relates to an improved photovoltaic system angle adjusting method. The invention provides an improved photovoltaic system angle adjusting method. The invention adopts the following steps: at the starting time, the normal direction 1 of the photovoltaic module leads the solar radiation direction a1, and the leading angle is thetas12; in the 1 st control period tsDuring the time, the solar radiation direction is gradually changed from the direction a1 to the direction b1, and the light is emittedThe included angle between the normal direction of the photovoltaic module and the solar radiation direction is thetas1The/2 is gradually changed into 0 and then gradually changed into theta from 0s12; in the 1 st control period tsAdjusting the rotation angle (theta) of the photovoltaic module at the end of the times1/2+θs2And/2) rotating the normal direction of the photovoltaic module from the position 1 to the position 2, wherein the normal direction 2 of the photovoltaic module is ahead of the solar radiation direction b1 by an angle thetas2/2。

Description

Improved photovoltaic system angle adjusting method
Technical Field
The invention belongs to the technical field of solar photovoltaic power generation, and particularly relates to an improved photovoltaic system angle adjusting method.
Background
The automatic tracking photovoltaic power generation system can improve the power generation efficiency of the photovoltaic system, but the tracking method still needs to be further improved.
Disclosure of Invention
The present invention is directed to the above-mentioned problems, and provides an improved method for adjusting an angle of a photovoltaic system.
In order to achieve the purpose, the invention adopts the following technical scheme that the method comprises the following steps:
at the starting time, the normal direction 1 of the photovoltaic module leads the solar radiation direction a1, and the leading angle is theta s12; in the 1 st control period tsIn time, the solar radiation direction is gradually changed from a direction a1 to a direction b1, and the included angle between the normal direction of the photovoltaic module and the solar radiation direction is thetas1The/2 is gradually changed into 0 and then gradually changed into theta from 0s12; in the 1 st control period tsAdjusting the rotation angle (theta) of the photovoltaic module at the end of the times1/2+θs2And/2) rotating the normal direction of the photovoltaic module from the position 1 to the position 2, wherein the normal direction 2 of the photovoltaic module is ahead of the solar radiation direction b1 by an angle theta s22; then, starting to enter the next adjusting period, wherein the solar irradiation direction b1 at the end time of the previous period is the solar irradiation direction a2 at the starting time of the next period; in the 2 nd regulation period tsDuring the time, the solar radiation direction is gradually changed from the direction a2 to the direction b2 in the 2 nd regulation period tsAdjusting the rotation angle (theta) of the photovoltaic module at the end of the times2/2+θs3And/2) rotating the normal direction of the photovoltaic module from the position 2 to the position 3, wherein the normal direction 3 of the photovoltaic module is ahead of the solar radiation direction b2 by an angle thetas3/2；
At the initial time of the adjusting period, the normal direction of the photovoltaic module leads the solar irradiation direction by an angle thetasnAt the end of the regulation period, the angle of the normal direction of the photovoltaic module lagging behind the solar radiation direction is thetasn/2。
As a preferable scheme, the invention adjusts the period from 0 to t in the first halfsThe included angle theta between the solar radiation direction and the normal direction of the photovoltaic module in 2 timetThe function relationship with time t is:
Figure BDA0002909841030000011
in the second half of the regulation period ts/2～tsIncluded angle theta between solar irradiation direction and normal direction of photovoltaic module in timetThe function relationship with time t is:
Figure BDA0002909841030000012
during the regulation period tsThe average included angle between the normal direction of the photovoltaic module and the solar irradiation direction in time is as follows:
Figure BDA0002909841030000013
as another preferred scheme, the photovoltaic module generates electricity
Figure BDA0002909841030000014
P is the peak power of the photovoltaic module, RtAs a function of the intensity of the irradiation over time, thetasIndicating the angle adjustment step.
As another preferable modeThe invention is said
Figure BDA0002909841030000021
The degree of the magnetic field is measured,
Figure BDA0002909841030000022
h, P ═ 10 kWp.
As another preferred mode, R in the present inventiontR or RtR + kt or RtR-kt or RtR + mcos (nt) or RtR + mcos (nt + c) or RtR + msin (nt) or Rt＝r+msin(nt+c)。
As another preferred mode, R in the present inventiont＝r＝0.8kW/m2Or Rt＝r+kt，r＝0.8kW/m2K is 0.6 or Rt＝r-kt， r＝0.8kW/m2K is 0.6 or Rt＝r+mcos(nt)，r＝0.8kW/m2M is 0.2, n is 6 pi or Rt＝r+mcos(nt+c)，r＝0.8kW/m2M is 0.2, n is 6 pi, c is pi or Rt＝r+msin(nt)，r＝0.8kW/m2M is 0.2, n is 6 pi or Rt＝r+msin(nt+c)，r＝0.8kW/m2，m＝0.2，n＝6π，c＝π。
As another preferred scheme, each adjusting period is divided into two time zones, namely a time zone a in which the normal direction of the photovoltaic module is ahead of the solar irradiation direction and a time zone b in which the normal direction of the photovoltaic module lags behind the solar irradiation direction; and collecting the generated energy of the photovoltaic modules in the two time zones, and adjusting the position of the photovoltaic module in the normal direction after the next angle adjustment according to the proportion of the generated energy of the photovoltaic modules in the two time zones so that the normal direction of the photovoltaic module after the next adjustment deviates to the time zone with more generated energy.
As another preferred scheme, in the invention, at the starting moment, the normal direction 1 of the photovoltaic module leads the solar radiation direction a1 by an angle thetas1a(ii) a In the 1 st control period tsIn time, the solar radiation direction is gradually changed from a direction a1 to a direction b1, and the included angle between the normal direction of the photovoltaic module and the solar radiation direction is changed from a leading angle thetas1aGradually becomes 0 and then is gradually changed from 0 to 0Taper to lag angle thetas1b(ii) a In the 1 st control period tsAdjusting the rotation angle (theta) of the photovoltaic module at the end of the times1b+θs2a) The normal direction of the photovoltaic module is rotated from the position 1 to the position 2, at the moment, the normal direction 2 of the photovoltaic module is ahead of the solar irradiation direction b1 by an angle thetas2a(ii) a Then, starting to enter the next adjusting period, wherein the solar irradiation direction b1 at the end time of the previous period is the solar irradiation direction a2 at the starting time of the next period; in the 2 nd regulation period tsIn time, the solar radiation direction is gradually changed from a direction a2 to a direction b2, and the included angle between the normal direction of the photovoltaic module and the solar radiation direction is changed from a leading angle thetas2aGradually becomes 0 and gradually becomes the lag angle theta from 0s2b。
As another preferred embodiment, the present invention is based on G in the 1 st cycle1aAnd G1bThe relative size and the proportional relation of the angle are calculated for the 1 st cycle, and under the condition that the power generation amounts in the lead time zone and the lag time zone are adjusted to be the same, an angle adjusting value is calculated (because of the randomness of the solar irradiation change, the relation between the power generation amount and the angle is simplified into the linear proportional relation for calculation); and calculating the angle of the photovoltaic module in the 2 nd period in the direction of the normal line leading the solar irradiation direction according to the angle adjusting value and the angles of the leading time area and the lagging time area of the 1 st period, and obtaining the angle of the photovoltaic module to be adjusted.
As another preferable mode, the present invention is arranged such that when the amount of power generation in the leading time zone is larger than the amount of power generation in the lagging time zone in the 1 st cycle (G)1a> G1b)，
Figure BDA0002909841030000023
G1a-ΔGab＝G1b+ΔGab
Figure BDA0002909841030000031
Figure BDA0002909841030000032
Calculating and adjusting the angle of the photovoltaic module to be rotated:
Figure BDA0002909841030000033
Figure BDA0002909841030000034
by thetas2a+θs2b＝θs2To obtain
Figure BDA0002909841030000035
Therefore, it is not only easy to use
Figure BDA0002909841030000036
Should be rotated by an angle of
Figure BDA0002909841030000037
Second, the present invention is arranged such that when the amount of power generation in the leading time zone is smaller than the amount of power generation in the lagging time zone in the 1 st cycle (G)1a<G1b)，
Figure BDA0002909841030000038
G1a+ΔGba＝G1b-ΔGba
Figure BDA0002909841030000039
Figure BDA0002909841030000041
Calculating and adjusting the angle of the photovoltaic module to be rotated:
Figure BDA0002909841030000042
Figure BDA0002909841030000043
by thetas2a+θs2b＝θs2To obtain
Figure BDA0002909841030000044
Therefore, it is not only easy to use
Figure BDA0002909841030000045
Should be rotated by an angle of
Figure BDA0002909841030000046
In addition, the present invention is arranged such that when the amount of power generation in the lead time zone is equal to the amount of power generation in the lag time zone in the 1 st cycle (G)1a＝G1b) And calculating and adjusting the angle of the photovoltaic module to be rotated:
Figure BDA0002909841030000047
by thetas2a+θs2b＝θs2To obtain
Figure BDA0002909841030000048
Therefore, it is not only easy to use
Figure BDA0002909841030000049
Should be rotated by an angle of
Figure BDA00029098410300000410
The invention has the beneficial effects.
The photovoltaic system angle adjusting method has the advantages that the average included angle between the normal direction of the photovoltaic module and the solar irradiation direction in the tracking period is small, and the generated energy generated by the photovoltaic module is large. The power generation capacity of the photovoltaic module is determined by the solar irradiation amount received in the normal direction of the module, and under the condition that the solar irradiation direction is not perpendicular to the surface of the photovoltaic module, the irradiation amount is multiplied by the cosine of an included angle between the solar irradiation direction and the normal direction of the photovoltaic module to convert the irradiation amount in the normal direction of the photovoltaic module. The smaller the included angle is, the larger the irradiation quantity received by the photovoltaic module is, and the larger the generated energy generated by the photovoltaic module is.
Drawings
The invention is further described with reference to the following figures and detailed description. The scope of the invention is not limited to the following expressions.
FIG. 1 is a schematic view of the angle adjustment method of the present invention.
FIG. 2 is a diagram showing the angle θ in the adjustment period in the angle adjustment method of the present inventiontTime-dependent function curve.
Fig. 3 is a schematic view of the rotation angle of the photovoltaic module in two consecutive adjustment cycles according to the present invention.
Fig. 4 is a diagram illustrating a state of use of the grid overvoltage regulating device of the energy storage system according to the present invention.
Fig. 5 is a circuit diagram of a CPU circuit and a power conversion circuit of the grid overvoltage regulating device of the energy storage system of the present invention.
Fig. 6 is a circuit diagram of an ac voltage detection circuit, a liquid crystal display circuit, and a key circuit of the power grid overvoltage adjusting device of the energy storage system of the present invention.
Fig. 7 is a circuit diagram of a 485 communication circuit, an EEPROM circuit and a calendar clock of the power grid overvoltage adjusting device of the energy storage system of the invention.
Fig. 8 is a communication circuit diagram of a relay control circuit (U8 plays a role of latching a control signal, when the CPU receives an interference program and runs off, signals of output pins D1 and D2 are unstable, and signals of output pins KA1 and KA2 of U8 are kept stable at this time, so as to avoid the relay from generating malfunction), where a1 and a2 are used to drive relays K1 and K2, and U9 plays a role of isolation) of the grid overvoltage regulating device of the energy storage system and the battery detection circuit receives a battery signal (U10 communicates with U11 of fig. 9).
Fig. 9 is a battery detection circuit diagram of the grid overvoltage regulating device of the energy storage system according to the invention.
FIGS. 5-7 show the main circuit; FIG. 9 is separated from the main circuit, and is placed near the battery, and the positive and negative poles of the battery are connected through a connector J9, and are connected with a main circuit connector J7 through a connector J8.
Fig. 10 is a flow chart of a control procedure of the grid overvoltage regulating device of the energy storage system according to the invention.
Detailed Description
As shown in fig. 1, the chain line represents the normal direction of the photovoltaic module, and the arrows at a1, a2, b1 and b2 represent the solar irradiation direction (a1 and a2 represent the solar irradiation direction at the starting time of each adjustment cycle, and b1 and b2 represent the solar irradiation direction at the ending time of each adjustment cycle). At the starting time, the normal direction 1 of the photovoltaic module leads the solar radiation direction a1 by an angle thetas1/2. In the 1 st control period tsIn time, the solar radiation direction is gradually changed from a direction a1 to a direction b1, and the included angle between the normal direction of the photovoltaic module and the solar radiation direction is thetas1The/2 is gradually changed into 0 and then gradually changed into theta from 0s1/2. In the 1 st control period tsAdjusting the rotation angle (theta) of the photovoltaic module at the end of the times1/2+θs2And/2) rotating the normal direction of the photovoltaic module from the position 1 to the position 2, wherein the normal direction 2 of the photovoltaic module is ahead of the solar radiation direction b1 by an angle thetas2/2. Then, the next adjustment period is started, and the solar irradiation direction b1 at the end time of the previous period is the solar irradiation direction a2 at the start time of the next period. In the 2 nd regulation period tsDuring the time, the solar radiation direction is gradually changed from the direction a2 to the direction b2 in the 2 nd regulation period tsAdjusting the rotation angle (theta) of the photovoltaic module at the end of the times2/2+θs3And/2) rotating the normal direction of the photovoltaic module from the position 2 to the position 3, wherein the normal direction 3 of the photovoltaic module is ahead of the solar radiation direction b2 by an angle thetas3/2. Thereafter eachThe angle adjusting process of the photovoltaic module is analogized in the same way.
At the initial time of the adjusting period, the normal direction of the photovoltaic module leads the solar irradiation direction by an angle thetasn/2(θsnIs an angle adjusting step length, n represents the angle adjusting step length in the nth adjusting period), and the angle of the normal direction of the photovoltaic module lagging the solar radiation direction is theta at the end time of the adjusting periodsn/2. Adjusting included angle theta in periodtThe time-dependent function is shown in fig. 2.
In the first half of the regulation period 0-tsThe included angle theta between the solar radiation direction and the normal direction of the photovoltaic module in 2 timetThe function relationship with time t is:
Figure BDA0002909841030000061
in the second half of the regulation period ts/2～tsIncluded angle theta between solar irradiation direction and normal direction of photovoltaic module in timetThe function relationship with time t is:
Figure BDA0002909841030000062
during the regulation period tsThe average included angle between the normal direction of the photovoltaic module and the solar irradiation direction in time is as follows:
Figure BDA0002909841030000063
during the regulation period tsThe average included angle between the normal direction of the photovoltaic module and the solar irradiation direction in time is thetasn/4。
Generating capacity G of photovoltaic module is P multiplied by R multiplied by T
Wherein G is the power generation capacity (unit kW.h) of the photovoltaic module, P is the peak power (unit kWp) of the photovoltaic module, and R is the intensity (unit kW/m) of solar radiation received by the photovoltaic module2) And T is time (unit h).
Wherein:
R＝Rt×COSθt
in the formula [ theta ]tIs a function (unit degree) of the change of an included angle between the solar irradiation direction and the normal direction of the photovoltaic module along with time; rtAs a function of irradiation intensity over time (in kW/m)2)。
Adjusting the period t s1/3 hours (20 minutes), the angle adjustment step size θsThe total power P of the photovoltaic module is 10kWp at 5 degrees. The power generation amount is calculated as follows.
Figure BDA0002909841030000064
In the first half period (the time t change interval is from 0 to 1/6 hours), the included angle between the normal direction of the photovoltaic module and the solar irradiation direction is gradually reduced from 2.5 degrees to 0 degree, and thetatThe function relationship with time t is:
Figure BDA0002909841030000065
in the second half period (the time t change interval is from 1/6 hours to 1/3 hours), the included angle between the normal direction of the photovoltaic module and the solar irradiation direction is gradually increased from 0 degree to 2.5 degrees, and thetatThe function relationship with time t is:
Figure BDA0002909841030000066
the variation of the irradiation intensity function with time in a super-short period (which can be 15 minutes to 4 hours) comprises the following conditions: 1, the irradiation intensity is unchanged; 2, the irradiation intensity is monotonously increased; 3, the irradiation intensity is monotonically decreased; 4, the irradiation intensity is firstly reduced and then increased; 5, increasing the irradiation intensity first and then decreasing the irradiation intensity; 6, increasing the irradiation intensity, then decreasing and then increasing; 7 the irradiation intensity is firstly reduced, then increased and then reduced.
The following 7 irradiation intensity change functions represent the above 7 change conditions, and the power generation amount of the photovoltaic module adopting the photovoltaic system angle adjustment method of the invention is calculated:
(1) the irradiation intensity is not changed
Rt＝r
Wherein r is 0.8kW/m2；
Figure BDA0002909841030000071
(2) Monotonic increase in irradiation intensity
Rt＝r+kt
Wherein r is 0.8kW/m2，k＝0.6；
Figure BDA0002909841030000072
(3) Monotonic decrease of irradiation intensity
Rt＝r-kt
Wherein r is 0.8kW/m2，k＝0.6；
Figure BDA0002909841030000073
(4) The irradiation intensity is firstly decreased and then increased
Rt＝r+mcos(nt)
Wherein r is 0.8kW/m2，m＝0.2，n＝6π；
Figure BDA0002909841030000074
(5) The irradiation intensity is increased and then decreased
Rt＝r+mcos(nt+c)
Wherein r is 0.8kW/m2，m＝0.2，n＝6π，c＝π；
Figure BDA0002909841030000075
(6) The irradiation intensity is increased, decreased and increased
Rt＝r+msin(nt)
Wherein r is 0.8kW/m2，m＝0.2，n＝6π；
Figure BDA0002909841030000076
(7) The irradiation intensity is firstly reduced, then increased and then reduced
Rt＝r+msin(nt+c)
Wherein r is 0.8kW/m2，m＝0.2，n＝6π，c＝π；
Figure BDA0002909841030000081
The average included angle between the normal direction of the photovoltaic module and the solar irradiation direction in the regulation period is small, and the generated energy generated by the photovoltaic module is large.
The rotation angle of the photovoltaic module in each adjustment is (theta)s1/2+θs2And/2) (as shown in fig. 1), maintaining the normal direction of the photovoltaic module at the position corresponding to the angle adjustment step 1/2 for the adjustment cycle.
The end position of each adjustment is not fixed to the position of the angle adjustment step 1/2. Each adjusting period is divided into two time zones, namely a time zone a in which the normal direction of the photovoltaic module leads the solar irradiation direction and a time zone b in which the normal direction of the photovoltaic module lags the solar irradiation direction. And collecting the generated energy of the photovoltaic modules in the two time zones, and adjusting the position of the photovoltaic module in the normal direction after the next angle adjustment according to the proportion of the generated energy of the photovoltaic modules in the two time zones so that the normal direction of the photovoltaic module after the next adjustment deviates to the time zone with more generated energy.
As shown in fig. 3, the schematic view of the rotation angle of the photovoltaic module is shown for two consecutive adjustment periods. Adjusting the period length tsThe angle adjusting step length of the two adjusting periods is thetas1And thetas12In the figure, the numbers 1 and 2 respectively represent the normal directions of the photovoltaic modules in the two regulation periods, and the numbers a1 and a2 represent the solar irradiation at the starting moments of the two regulation periodsThe directions b1, b2 indicate the solar irradiation directions at the end of the two adjustment periods. Thetas1aAnd thetas2aThe angle theta which is the angle that the normal direction of the photovoltaic module is ahead of the solar radiation direction at the starting time of the two regulation periodss1bAnd thetas2bThe angles of the normal direction of the photovoltaic module lagging the solar irradiation direction at the end time of the two adjusting periods are respectively.
At the starting time, the normal direction 1 of the photovoltaic module leads the solar radiation direction a1 by an angle thetas1a. In the 1 st control period tsIn time, the solar radiation direction is gradually changed from a direction a1 to a direction b1, and the included angle between the normal direction of the photovoltaic module and the solar radiation direction is changed from a leading angle thetas1aGradually becomes 0 and gradually becomes the lag angle theta from 0s1b. In the 1 st control period tsAdjusting the rotation angle (theta) of the photovoltaic module at the end of the times1b+θs2a) The normal direction of the photovoltaic module is rotated from the position 1 to the position 2, at the moment, the normal direction 2 of the photovoltaic module is ahead of the solar irradiation direction b1 by an angle thetas2a. Then, the next adjustment period is started, and the solar irradiation direction b1 at the end time of the previous period is the solar irradiation direction a2 at the start time of the next period. In the 2 nd regulation period tsIn time, the solar radiation direction is gradually changed from a direction a2 to a direction b2, and the included angle between the normal direction of the photovoltaic module and the solar radiation direction is changed from a leading angle thetas2aGradually becomes 0 and gradually becomes the lag angle theta from 0s2b。
G1aThe generated energy G of the photovoltaic module in the time that the normal direction of the photovoltaic module advances the solar radiation direction in the 1 st period1bThe generated energy K of the photovoltaic module in the time that the normal direction of the photovoltaic module lags behind the solar irradiation direction in the 1 st period1abIs the 1 st period G1aAnd G1bRatio of (A) to (B), K1baIs the 1 st period G1bAnd G1aA ratio of (a) to (a) GabAdjusting the power generation amount from the leading time zone to the lagging time zone in the 1 st cycle by the delta GbaAdjusting the amount of power generation from the lag time zone to the lead time zone in the 1 st cycle by delta theta1abIs the leading time zone of the 1 st cycle lagsAngular adjustment of the interval, Delta theta1baThe angle adjustment value from the lag time zone to the lead time zone in the 1 st period.
According to G in the 1 st period1aAnd G1bThe relative size and the proportional relation of the angle are calculated for the 1 st cycle, and under the condition that the power generation amounts in the lead time zone and the lag time zone are adjusted to be the same, an angle adjusting value is calculated (the relation between the power generation amount and the angle is simplified into a linear proportional relation for calculation due to the randomness of solar irradiation change). And calculating the angle of the photovoltaic module in the 2 nd period in the direction of the normal line leading the solar irradiation direction according to the angle adjusting value and the angles of the leading time area and the lagging time area of the 1 st period, and obtaining the angle of the photovoltaic module to be adjusted. When the normal direction of the photovoltaic module is at the position of the cycle angle interval 1/2, if the solar energy irradiation amount of the leading time zone and the lagging time zone is not equal, the normal direction of the photovoltaic module generates more power generation amount in the same regulation cycle if the normal direction of the photovoltaic module deviates to the time zone with larger solar energy irradiation amount. After the optimal adjustment method is adopted, the normal direction of the photovoltaic module is not fixed at the position of the angle interval 1/2 of the next period after each adjustment, but is dynamically adjusted according to the proportion of the power generation amount of the photovoltaic module in the lead time area and the lag time area in the previous period (namely the proportion of the solar energy irradiation amount received by the photovoltaic module), so that the normal position of the photovoltaic module deviates to the time area with higher power generation amount of the photovoltaic module, and more power generation amount can be obtained through the adjustment.
(1) When the amount of power generation in the leading time zone is larger than the amount of power generation in the lagging time zone in the 1 st cycle (G)1a>G1b)，
Figure BDA0002909841030000082
G1a-ΔGab＝G1b+ΔGab
Figure BDA0002909841030000091
Figure BDA0002909841030000092
Calculating and adjusting the angle of the photovoltaic module to be rotated:
Figure BDA0002909841030000093
Figure BDA0002909841030000094
by thetas2a+θs2b＝θs2To obtain
Figure BDA0002909841030000095
Therefore, it is not only easy to use
Figure BDA0002909841030000096
Should be rotated by an angle of
Figure BDA0002909841030000097
(2) When the amount of electric power generation in the leading time zone is smaller than the amount of electric power generation in the lagging time zone in the 1 st cycle (G)1a<G1b)，
Figure BDA0002909841030000098
G1a+ΔGba＝G1b-ΔGba
Figure BDA0002909841030000099
Figure BDA0002909841030000101
Calculating and adjusting the angle of the photovoltaic module to be rotated:
Figure BDA0002909841030000102
Figure BDA0002909841030000103
by thetas2a+θs2b＝θs2To obtain
Figure BDA0002909841030000104
Therefore, it is not only easy to use
Figure BDA0002909841030000105
Should be rotated by an angle of
Figure BDA0002909841030000106
(3) When the amount of electric power generation in the leading time zone is equal to the amount of electric power generation in the lagging time zone in the 1 st cycle (G)1a＝G1b) And calculating and adjusting the angle of the photovoltaic module to be rotated:
Figure BDA0002909841030000107
by thetas2a+θs2b＝θs2To obtain
Figure BDA0002909841030000108
Therefore, it is not only easy to use
Figure BDA0002909841030000109
Should be rotated by an angle of
Figure BDA00029098410300001010
The improved photovoltaic system angle adjusting method can be applied to an automatic tracking photovoltaic power generation system of a photovoltaic array in an energy storage system. The power grid overvoltage regulating device of the energy storage system comprises a relay control circuit, a 485 communication circuit, an alternating current voltage detection circuit, a storage battery detection circuit, a liquid crystal display circuit, a key circuit, an EEPROM circuit and a CPU circuit, the signal transmission port of the CPU circuit is connected with the signal transmission port of the 485 communication circuit, the detection signal output port of the alternating-current voltage detection circuit is connected with the detection signal input port of the CPU circuit, the detection signal output port of the storage battery detection circuit is connected with the detection signal input port of the CPU circuit, the display signal input port of the liquid crystal display circuit is connected with the display signal output port of the CPU circuit, the control signal output port of the key circuit is connected with the control signal input port of the CPU circuit, the signal transmission port of the EEPROM circuit is connected with the signal transmission port of the CPU circuit, and the control signal input port of the relay control circuit is connected with the control signal output port of the CPU circuit.
The liquid crystal display circuit and the key circuit can be used for setting initial parameters of a detection period, an inverter output power threshold T1, a storage battery internal resistance threshold T2, a storage battery upper limit voltage T3 and a storage battery lower limit voltage T4, and displaying date and time, storage battery voltage and internal resistance working state values.
And a control signal output port of the relay control circuit is connected with a control signal input port of the field effect transistor amplification circuit through optical coupling isolation. The relay control circuit outputs a control signal by a CPU, and directly drives a relay in a control system after passing through an optical coupling isolation and field effect transistor amplification circuit.
And a detection signal input port of the alternating voltage detection circuit is connected with a detection signal output port of the Hall voltage transformer. The alternating voltage detection circuit collects an alternating voltage value at a grid-connected point through the Hall voltage transformer, converts the alternating voltage value into a 0-5V direct voltage signal, and performs data collection through an AD conversion module in the CPU.
And the alarm signal output port of the CPU circuit is connected with the alarm signal input port of the alarm circuit.
The storage battery detection circuit adopts a Sentinal 2-HV sensor. The storage battery detection circuit adopts a Sentinal 2-HV sensor of LEM company to detect the voltage and the internal impedance of each single storage battery on line, converts an S-BUS serial communication BUS signal output by the sensor into an RS-232 signal through a conditioning circuit formed by U11, U12, U13 and a peripheral circuit, and converts the RS-232 signal into a TTL level signal through U10 and the peripheral circuit to be sent to a CPU.
And the signal transmission port of the CPU circuit is connected with the signal transmission port of the calendar clock circuit. The calendar clock circuit can provide real-time date and time values for the CPU and provide accurate time for the system to change in various states.
And a detection signal output port of the storage battery detection circuit is connected with a detection signal input port of the CPU circuit through a communication circuit.
The power supply port of the relay control circuit, the power supply port of the 485 communication circuit, the power supply port of the alternating-current voltage detection circuit, the power supply port of the storage battery detection circuit, the power supply port of the liquid crystal display circuit, the power supply port of the key circuit, the power supply port of the EEPROM circuit and the power supply port of the CPU circuit are respectively connected with the electric energy output port of the power supply conversion circuit. The power supply conversion circuit changes the power supply from 24V to 5V and plays roles of isolation and filtering.
The CPU circuit adopts a PIC18F6621 chip U, pins 1-38 of the U are correspondingly connected with D, RELAY, TX, RX, ROL, RESET, ROL, GND, +5, ROL, CL, +5V benchmark, GND, VOLTAGE, LED-1, GND, + 5-IO, TM-CLK, TM-RST, T/, RX, BUZZ, SCL, SDA, WP, PGD and +5V respectively, pin 39 of the U is connected with one end of a crystal oscillator X and one end of a capacitor C respectively, the other end of the C is connected with ground and one end of the capacitor C respectively, the other end of the C is connected with the other end of X and pin 40 of the U respectively, pins 41-46 of the U are connected with GND, PGC, LCD # CS and LED-2 respectively, and pins 49-63 of the U are connected with FD-FD, LCD # 5, + RST, # A, BLE, LCD # CS and LCD # E, The LCD # WR and the LCD # RS are correspondingly connected; +5V is respectively connected with one end of a resistor R1 and the cathode of a diode D1, the other end of R1 is respectively connected with one end of a capacitor C1, one end of a resistor R2 and the anode of a diode D1, the other end of C1 is grounded, the other end of R2 is respectively connected with RESET and a pin 1 of a connector J1, and pins 2-6 of J1 are respectively correspondingly connected with +5V, GND, PGD, PGC and + 5V.
The X1 adopts 22.1184MHz/50PPM crystal oscillator, the C2 and C3 adopt 18pF, the R1 adopts 10K resistor, the D1 adopts 1N4148 diode, the C1 adopts 0.1uF capacitor, and the R2 adopts 1K resistor.
The power conversion circuit comprises a connector J2, wherein 2 pins of J2 are respectively connected with the anode of a 24V diode D2, the cathode of D2 is respectively connected with the anode of a capacitor E1 and the 1 pin of a chip P1 of B2405S, 2 pins of P1 are respectively connected with the cathode of E1, one end of a resistor R3, EARTH and 1 pin of J2, the other end of R3 is respectively connected with the 3 pin of P1, the cathode of the capacitor E2, GND and the cathode of the capacitor E3, the anode of the capacitor E3 is respectively connected with one end of a +5V inductor L1, and the other end of L1 is respectively connected with the anode of E2 and the 4 pins of P1.
The D2 adopts an IN4004 diode, the E1 adopts a 220uF/50V capacitor, the R3 adopts a 10M/0.5W resistor, the E2 adopts a 4.7uF/50V capacitor, the E3 adopts a 100uF/16V capacitor, and the L1 adopts a 100uH capacitor.
The alternating voltage detection circuit comprises an HNV025 chip U, a pin 1 of the U is connected with a pin 2 of a connector J through a resistor R, the pin 2 of the U is connected with the pin 1 of the J, pins 3 and 4 of the U are correspondingly connected with-15V and +15V respectively, a pin 5 of the U is connected with one end of a resistor R and one end of the resistor R respectively, the other end of the R is grounded, the other end of the R is connected with the pin 2 and one end of a resistor R of an LM324 chip CA respectively, a pin 3 of the CA is connected with one end of the resistor R and one end of the resistor R respectively, the other end of the R is connected with the other end of the R and the ground respectively, a pin 4 of the CA is connected with +15V, a pin 11 of the CA is connected with-15V, a pin 1 of the CA is connected with the other end of the R and one end of the R respectively, the other end of the resistor R is connected with a pin 6 of the CA, a pin 5 of the, A pin 10 of CA1 is connected, a pin 9 of CA1 is respectively connected with a pin 8 of CA1 and one end of a resistor R14, the other end of R14 is respectively connected with one end of a capacitor C4 and one end of a resistor R15, the other end of C4 is grounded, the other end of R15 is respectively connected with a cathode of a VOLTAGE regulator tube D3, a cathode of a diode D4 and VOLTAGE, and an anode of D3 is respectively connected with an anode of D4 and ground; pins 1, 2 and 3 of the connector J4 are correspondingly connected with +15V, -15V and ground respectively.
The resistor R4 is a 27K/5W resistor, the resistor R5 is a 200 resistor, the resistors R6, R7, R8 and R9 are 30K resistors, the resistors R10, R11, R12 and R13 are 15K resistors, the resistors R14 and R15 are 200K resistors, the capacitor C4 is a 0.1uF capacitor, the voltage regulator D3 is a 1N4733A voltage regulator, and the diode D4 is a 1N4148 diode.
2 pins of a MAX6350 chip U3 are respectively connected with one end of a capacitor C5 and +15V, the other end of the capacitor C5 is respectively connected with the ground and 4 pins of a U3, and 6 pins of the U3 are connected with a +5V reference;
the key circuit comprises pins 1-6 of an exclusion RA1 which are correspondingly connected with pins +5V, CL 1-CL 5 respectively;
RL1 is connected with ROL1 through a resistor R16; RL2 is connected with ROL2 through a resistor R17; RL3 is connected with ROL3 through a resistor R18; RL4 is connected with ROL4 through a resistor R19; RL5 is connected with ROL5 through a resistor R20;
pins 1-10 of the connector J5 are correspondingly connected with CL 1-CL 5 and RL 1-RL 5 respectively.
The C5 adopts a 0.1uF capacitor, R16-R20 adopt a 33 resistor, and RA1 adopts exclusion 2K 5.
The liquid crystal display circuit adopts an LM19264D chip U4, a pin 1 of U4 is connected with GND, a pin 2 of U4 is respectively connected with one ends of +5V and a resistor R21, the other end of R21 is respectively connected with one end of a resistor R22, a pin VO and a pin 3 of U4, pins 4-20 of U4 are respectively connected with an LCD # RS, an LCD # WR, an LCD # E, FD 0-FD 7, an LCD # CS1, an LCD # RST, an LCD # CS2, an LCD # CS3, the other end of R22 and an emitter of an NPN triode Q1 correspondingly, a collector of Q1 is respectively connected with one ends of +5V and a resistor R23, the other end of R23 is respectively connected with one ends of an LCD # BLA and a resistor R24, and the other end of R24 is connected.
R21 adopts 51K resistance, and R22 adopts 6K resistance, and Q1 adopts the 9014 triode, and R23, R24 adopt 1K resistance.
The 485 communication circuit comprises an SP485 chip U5, wherein a pin 1 of U5 is connected with RX1, pins 2 and 3 of U5 are connected with T/R, a pin 4 of U5 is connected with TX1, a pin 5 of U5 is grounded, a pin 6 of U5 is respectively connected with one end of a resistor R26 and one end of a resistor R27, the other end of R26 is respectively connected with a pin 7 of U5 and one end of the resistor R25, the other end of R25 is respectively connected with one end of 485B and one end of a resistor R28, and the other end of the resistor R28 is respectively connected with the other end of R27 and 485A; the pin 8 of the U5 is respectively connected with +5V and one end of a capacitor C6, and the other end of the capacitor C6 is grounded; 1-5 pins of the connector J6 are correspondingly connected with 485A, 485B, K1, K2 and ground respectively.
The R26 adopts a 120/0.25W resistor, the R25 and the R27 adopt 20/0.25W resistors, the R28 adopts a 1M resistor, and the C6 adopts a 0.1uF capacitor.
The alarm circuit comprises an NPN triode Q2, a PNP triode Q3 and a PNP triode Q4, wherein the base electrode of the Q2 is connected with BUZZ through a resistor R29, the collector electrode of the Q2 is connected with +5V, the emitter electrode of the Q2 is connected with the positive electrode of a buzzer BZ1, and the negative electrode of the BZ1 is grounded;
the base electrode of Q3 is connected with LED-1 through a resistor R30, the collector electrode of Q3 is grounded, the emitter electrode of Q3 is connected with the cathode of a light-emitting diode LED1, and the anode electrode of LED1 is connected with +5V through a resistor R31;
the base of Q4 is connected with LED-2 through resistor R32, the collector of Q4 is grounded, the emitter of Q4 is connected with the cathode of LED2, and the anode of LED2 is connected with +5V through resistor R33.
When the voltage of the grid-connected point is not over-voltage, the green diode emits light, and the red diode is extinguished. When the voltage of the grid connection point is over-voltage and the energy storage system starts to charge the storage battery pack, the red diode emits light, the green diode extinguishes, and the buzzer sounds for 1 time every 1 minute, so that the sound-light alarm function is realized.
The resistor 820 is adopted for R29, the triode 9014 is adopted for Q2, the triode 9012 is adopted for Q3 and Q4, the resistor 20 is adopted for R30 and R32, the LED _ RED is adopted for LED1, the LED _ GREEN is adopted for LED2, and the resistor 820 is adopted for R31 and R33.
The EEPROM circuit adopts an AT24C128 chip U6, 1, 2, 3 and 4 of U6 are grounded, 5 feet of U6 are respectively connected with SDA and one end of a resistor R35, the other end of R35 is respectively connected with one end of a resistor R34, +5V, one end of a capacitor C7 and 8 feet of U6, the other end of C7 is grounded, 7 feet of U6 are connected with WP, and 6 feet of U6 are respectively connected with the other ends of SCL and R34.
The C7 adopts a 0.1uF capacitor, and R34 and R35 adopt 4.7K resistors.
The calendar clock circuit adopts an HT1380 chip U7, wherein 2 pins of U7 are respectively connected with one end of a crystal oscillator X2 and one end of a capacitor C9, the other end of C9 is respectively connected with the ground and one end of a capacitor C10, the other end of C10 is respectively connected with the other end of X2 and the 3 pin of U7, 4 pins of U7 are grounded, 5, 6 and 7 of U7 are respectively correspondingly connected with TM-RST, TM-IO and TM-CLK, 8 pins of U7 are respectively connected with a cathode of a diode D5, one end of a capacitor C8 and a cathode of a diode D6, an anode of D5 is connected with an anode of a battery B1, a cathode of B1 is grounded, the other end of C8 is grounded, and an anode of D6 is connected.
8pF capacitors are adopted for C9 and C10, 32.768KHz/5PPM crystal oscillator is adopted for X2, BATTERY CR2032 is adopted for B1, 1N4148 diodes are adopted for D5, 0.1uF capacitors are adopted for C8, and 1N4148 diodes are adopted for D6.
The RELAY control circuit comprises a 74HC373 chip U8, a TLP521-4 chip U9, an IRF9530 tube A1 and an IRF9530 tube A2, wherein pins 4, 7, 1, 11, 10, 20, 6 and 5 of the U8 are respectively correspondingly connected with pins D1, D2, GND, RELAY, GND, +5V, KA2 and KA 1;
a pin 1 of U9 is respectively connected with one end of a +5V resistor R36 through a resistor R37, the other end of R36 is connected with a pin 3 of U9, a pin 2 of U9 is connected with KA1, a pin 4 of U9 is connected with KA2, a pin 13 of U9 is respectively connected with EARTH and a pin 15 of U9, a pin 14 of U9 is respectively connected with one ends of KM2 and a resistor R39, the other end of R39 is respectively connected with one end of a resistor R38 and 24V, and the other end of R38 is respectively connected with a pin 16 of KM1 and U9;
the G pole of A1 is respectively connected with one end of a resistor R40 and the anode of a Schottky diode D7, the other end of R40 is connected with KM1, the cathode of D7 is respectively connected with the S pole and 24V pole of A1, the D pole of A1 is respectively connected with K1 and the cathode of a diode D8, and the anode of D8 is grounded;
the G pole of A2 is connected with one end of a resistor R41 and the anode of a Schottky diode D9 respectively, the other end of R41 is connected with KM2, the cathode of D9 is connected with the S pole and 24V pole of A2 respectively, the D pole of A2 is connected with K2 and the cathode of a diode D10 respectively, and the anode of D10 is grounded.
The resistors R36 and R37 adopt 360 resistors, the resistors R38 and R39 adopt 10K resistors, the resistors R40 and R41 adopt 20K resistors, the Schottky diodes D7 and D9 adopt 4.3V, and the diodes D8 and D10 adopt 1N 4007.
The communication circuit adopts an ICL232 chip U10, pins 11 and 12 of U10 are correspondingly connected with TX2 and RX2 respectively, pin 16 of U10 is connected with +5V and the anode of a capacitor E4 respectively, pin 1 of U10 is connected with the anode of a capacitor E5, the cathode of E5 is connected with pin 3 of U10, pin 2 of U10 is connected with the anode of a capacitor E6, the cathode of E6 is connected with the cathode of E4, the cathode of a capacitor E7, the ground and the pin 15 of U10 respectively, pin 6 of U10 is connected with the cathode of E7, pin 5 of U10 is connected with the cathode of a capacitor E8, the anode of E8 is connected with pin 4 of U10, and pins 13 and 14 of U10 are correspondingly connected with RS232-RX and RS232-TX respectively; pins 1-4 of the connector J7 are correspondingly connected with +5V, GND, RS232-TX and RS232-RX respectively.
The E4-E8 adopt 0.1uF capacitance.
The storage battery detection circuit comprises a B0505 chip P2, a Sentinel 2-HV chip JP1, a Sentinel 2-HV chip JP2, an ICL232 chip U11, a TIL117 chip U12 and a TIL117 chip U13, wherein a pin 2 of a P2 is respectively connected with one end of an inductor L2 and one end of a capacitor C13, the other end of the L2 is respectively connected with one end of a capacitor C12 and one end of a capacitor C11, +5V, the other end of the C11 is respectively connected with the ground, the other end of the C11 and a pin 1 of the P11, a pin 3 of the P11 is respectively connected with one end of the capacitor C11, the negative electrode of the E11, an S-GND and the negative electrode of the capacitor E11, the positive electrode of the E11 is respectively connected with the positive electrodes of VCC5, the E11, the other end of the C11, one end of the inductor L36;
pins 1-4 of the connector J8 are correspondingly connected with +5V, GND, RS232-TX and RS232-RX respectively;
pins 11 and 12 of U11 are correspondingly connected with DOUT and DIN, pin 16 of U11 is correspondingly connected with the positive electrodes of +5V and a capacitor E11, pin 1 of U11 is connected with the positive electrode of the capacitor E12, the negative electrode of E12 is connected with pin 3 of U11, pin 2 of U11 is connected with the positive electrode of the capacitor E13, the negative electrode of E13 is respectively connected with the negative electrode of E11, the negative electrode of the capacitor E14, the ground and pin 15 of U11, pin 6 of U11 is connected with the negative electrode of E14, pin 5 of U11 is connected with the negative electrode of the capacitor E15, the positive electrode of E15 is connected with pin 4 of U11, and pins 13 and 14 of U11 are correspondingly connected with RS232-RX and RS232-TX respectively;
the 1 pin of JP1 is respectively connected with the 1 pins of S-TXD and JP2, the 2 pin of JP1 is respectively connected with the 4 pins of JP1, the 2 pins of JP2, the 4 pins of JP2 and S-GND, the 3 pin of JP1 is respectively connected with the 3 pins of S-RXD and JP2, the 5 pin of JP1 is respectively connected with the 6 pins of JP1 and BAT1-N, the 7 pin of JP1 is respectively connected with the 8 pins of JP1 and BAT1-P, the 5 pin of JP2 is respectively connected with the 6 pins of JP2 and BAT2-N, and the 7 pin of JP2 is respectively connected with the 8 pins of JP2 and BAT 2-P;
1-4 pins of the connector J9 are correspondingly connected with BAT1-P, BAT1-N, BAT2-P, BAT2-N respectively;
the 4 feet of U12 are respectively connected with one ends of DOUT and a resistor R42, the other end of R42 is connected with +5V, the 3 feet of U12 are grounded, the 1 foot of U12 is connected with the 1 foot of TLV2472 chip CA2, the 8 foot of CA2 is connected with VCC5V, the 4 feet of CA2 are respectively connected with S-GND and one end of a resistor R44, the other end of R44 is respectively connected with the 3 foot of CA2 and one end of a resistor R45, the other end of R45 is connected with VCC V, the 2 feet of CA2 are respectively connected with one end of a resistor R46, one end of a capacitor C16 and one end of a resistor R47, the other end of R47 is connected with S-TXD, the other end of the resistor R43 and the other end of the capacitor C16 are connected with S-GND, and the other end;
a pin 1 of the U13 is connected with DIN, a pin 2 of the U13 is connected with the ground through a resistor R48, a pin 4 of the U13 is connected with VCC5V, a pin 3 of the U13 is respectively connected with S-RXD and one end of a resistor R49, and the other end of the R49 is connected with S-GND.
The C11 adopts 22uF, the C12 adopts 100nF, the L2 adopts 4.7uH, the C13 adopts 100nF, the C14 adopts 100nF, the L3 adopts 4.7uH, the C15 adopts 0.1uF, the E9 adopts 100uF, the E10 adopts 220uF, the E11-E15 adopt 0.1uF capacitor, the R42 and the R43 adopt 1K resistor, the R44 adopts 4.3K resistor, the R45 adopts 680 resistor, the R46 adopts 1K resistor, the C16 adopts 680pF, the R47 adopts 2.4K resistor, the R48 adopts 470 resistor, and the R49 adopts 1K resistor.
The storage battery detection circuit has a signal isolation function (U12, U13 and peripheral circuits in fig. 9), the storage battery detection circuit and the CPU circuit are communicated through RS-232 level signals (realized through U10, U11 and the peripheral circuits), the communication distance can reach 15 meters, and the storage battery detection circuit can be independently installed nearby a storage battery pack.
The power supply and the ground of the invention are divided into 3 groups, the 1 st group is 24V and EARTH, and supplies power for the voltage conversion circuit and the coil of the driving relay; group 2 is +5V, +15V, -15V, GND (ground indicated by the largest three horizontal lines in the figure), which is for supplying power to the main control circuit board; group 3 is VCC5V and S-GND (ground indicated by an inverted triangle in the figure), which is the ground that supplies the battery detection circuit. These 3 power supplies are isolated from each other.
When the overvoltage regulating system is installed and used, a 485 communication port of the photovoltaic grid-connected inverter is connected with a 485 communication circuit interface of the overvoltage regulating system by using a shielded twisted pair; an energy storage system (in figure 4, a photovoltaic grid-connected power generation and energy storage system forms a charging and discharging loop, alternating current electric energy is converted into direct current electric energy from a power grid, the direct current electric energy is stored by a storage battery pack and can be transmitted to a direct current input end of a grid-connected inverter and is transmitted to the power grid by the grid-connected inverter, a relay K1 controls whether the energy storage system absorbs the electric energy from the power grid to charge the storage battery pack, a voltage-stabilizing direct current switching power supply rectifies alternating current of the power grid into direct current, a charging and discharging controller charges and discharges the storage battery pack, a direct current booster boosts the direct current with lower voltage output by the charging and discharging controller to direct current with higher voltage required by the direct current input end of the grid-connected inverter, and a relay K2 controls whether the energy storage system transmits the, model No. SPI 4000-B2. The relay K1 can be solid state relay manufactured by Deleisi electric Co., Ltd, and is CDG1-1 DA/25A. The voltage-stabilizing DC switch power supply can be made of the product of Hangzhou Brilliant electronics Limited company, and has the model of HYJ-3000E. The charge and discharge controller can be a product manufactured by Beijing Hui energy smart technology corporation, and the model is VS6048 AU. The storage battery pack can be 4 maintenance-free lead-acid storage batteries with the model number of 6-GFM-50 produced by Jiangsu Huafu storage battery company Limited, the voltage of each battery is 12V, the capacity of each battery is 50Ah, and 4 storage battery packs with the voltage of 48V and the capacity of 50Ah are formed after being connected in series for use. The DC booster may be selected from the series of voltage boosters available from the electronic company GmbH, hundred million, Suzhou, model number S2000-48/280. The relay K2 can be a solid-state relay produced by Deleisi electric Limited company, and the model is CDG1-1DD/25A), and input control ports of the relay K1 and K2 are connected with an output control port of a relay control circuit of the overvoltage regulating system; the output port of the alternating current network voltage signal is connected with the sampling input port of the alternating current voltage detection circuit; the positive and negative poles of each single storage battery in the storage battery pack are connected with the input port of the storage battery detection circuit; the signal transmission port of the liquid crystal display circuit is connected with the signal transmission port of the CPU circuit; the control signal input port of the key circuit is connected with the control signal output port of the external keyboard.
As shown in fig. 10, when the overvoltage regulating system starts to work, the initial parameters of the detection period, the inverter output power threshold T1(T1 is the difference between the rated output power of the inverter and the rated output power of the charge-discharge controller), the internal resistance threshold T2 of the battery pack, the upper limit voltage T3 of the battery pack, and the lower limit voltage T4 of the battery pack are set, the relays K1 and K2 are kept in a normally open state, and then the ac voltage value U is collected.
If U is greater than 265V, entering a program branch circuit 1, judging whether the internal resistance of each storage battery is greater than T2, if so, displaying that the internal resistance of each storage battery is too large and needs to be replaced on a liquid crystal display screen, giving the serial number of the storage battery needing to be replaced, and then entering a detection period to wait. If the voltage of the storage battery pack is not greater than T2, continuously judging whether the voltage of the storage battery pack is less than T3, if the voltage of the storage battery pack is less than T3, disconnecting K1, stopping charging, and entering a detection period to wait; if greater than T3, K1 is closed and battery charging is initiated. Continuing to collect the alternating voltage value U, and repeating the circulation of the program branch 1 if U is greater than 250V; if U <250V, K1 is turned off, charging is stopped, and a detection cycle is entered to wait.
If U <265V, program branch 2 is entered. And continuously judging whether U is less than 240V, if U is more than 240V, disconnecting K2, stopping discharging, and entering a detection period for waiting. And if the U is less than 240V, acquiring the output power value of the inverter, and if the output power of the inverter is greater than a threshold value T1, disconnecting K2, stopping discharging, and entering a detection period to wait. If the output power of the inverter is smaller than a threshold value T1, judging whether the voltage of the storage battery pack is larger than T4, if the voltage of the storage battery pack is not larger than T4, disconnecting K2, stopping discharging, and entering a detection period to wait; if greater than T4, K2 is closed, the battery pack begins to discharge, and the cycle of program leg 2 is repeated.
And repeating the execution steps of the circulation program to carry out overvoltage regulation after the system waits for the end of the detection period.
And when the voltage of the grid-connected point exceeds a certain threshold value, starting the energy storage system as a load of the power distribution network, absorbing partial electric energy generated by the photovoltaic system and reducing the voltage of the grid-connected point. And when the voltage of the grid-connected point is lower than a certain threshold value, the electric energy stored in the energy storage system is sent to the power grid through the grid-connected inverter. The overvoltage of a local power grid is prevented, and the waste of photovoltaic power generation power is reduced.
The invention can detect the voltage of the grid-connected point through the alternating voltage detection circuit, the energy storage system is used as a load to regulate the voltage, and the stored electric energy is sent to the power grid again under the appropriate condition.

Claims (2)

1. An improved photovoltaic system angle adjustment method is characterized by comprising the following steps:
at the starting time, the normal direction 1 of the photovoltaic module leads the solar radiation direction a1, and the leading angle is thetas12; in the 1 st control period tsIn time, the solar radiation direction is gradually changed from a direction a1 to a direction b1, and the included angle between the normal direction of the photovoltaic module and the solar radiation direction is thetas1The/2 is gradually changed into 0 and then gradually changed into theta from 0s12; in the 1 st control period tsAdjusting the rotation angle (theta) of the photovoltaic module at the end of the times1/2+θs2And/2) rotating the normal direction of the photovoltaic module from the position 1 to the position 2, wherein the normal direction 2 of the photovoltaic module is ahead of the solar radiation direction b1 by an angle thetas22; then, starting to enter the next adjusting period, wherein the solar irradiation direction b1 at the end time of the previous period is the solar irradiation direction a2 at the starting time of the next period; in the 2 nd regulation period tsDuring the time, the solar radiation direction is gradually changed from the direction a2 to the direction b2 in the 2 nd regulation period tsAdjusting the rotation angle (theta) of the photovoltaic module at the end of the times2/2+θs3And/2) rotating the normal direction of the photovoltaic module from the position 2 to the position 3, wherein the normal direction 3 of the photovoltaic module is ahead of the solar radiation direction b2 by an angle thetas3/2；
At the initial time of the adjusting period, the normal direction of the photovoltaic module leads the solar irradiation direction by an angle thetasnAt the end of the regulation period, the angle of the normal direction of the photovoltaic module lagging behind the solar radiation direction is thetasn/2。
2. The improved photovoltaic system angle adjustment method according to claim 1, wherein the adjustment period is from 0 to t in the first halfsIn the solar irradiation direction and the normal direction of the photovoltaic module within 2 timesIncluded angle thetatThe function relationship with time t is:
Figure FDA0002909841020000011
in the second half of the regulation period ts/2～tsIncluded angle theta between solar irradiation direction and normal direction of photovoltaic module in timetThe function relationship with time t is:
Figure FDA0002909841020000012
during the regulation period tsThe average included angle between the normal direction of the photovoltaic module and the solar irradiation direction in time is as follows:
Figure FDA0002909841020000021
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