CN104881074B - A kind of photovoltaic generating system and power regulating method - Google Patents
A kind of photovoltaic generating system and power regulating method Download PDFInfo
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Abstract
The invention provides the power regulating method of a kind of photovoltaic generating system, the method comprise the steps that according to described instantaneous voltage, it may be judged whether produce voltage rising edge zero crossing；When producing voltage rising edge zero crossing, start timing, obtain the time delay of voltage rising edge zero crossing；According to described instantaneous voltage, obtain voltage effective value；According to described current effective value and described voltage effective value, obtain the first apparent energy；Time delay according to voltage rising edge zero crossing and the time delay of electric current trailing edge zero crossing, obtain the time between voltage rising edge zero crossing and electric current trailing edge zero crossing；According to the time between voltage rising edge zero crossing and electric current trailing edge zero crossing, obtain voltage power factor and power flow direction；According to described first apparent energy, voltage power factor and current power factor, obtain active power of output size；According to active power of output size and power flow direction, regulate the bearing power of described photovoltaic generating system.
Description
Technical field
Field of photovoltaic power generation of the present invention, particularly relate to a kind of photovoltaic generating system and power regulating method.
Background technology
Along with the development of photovoltaic power generation technology, the reduction of photovoltaic generation cost, photovoltaic generating system progresses into
The family of user.For making full use of the generated energy of electricity generation system, need to detect in real time the merit of consumer networks entrance
Rate direction and size, to adjust bearing power, it is achieved the maximum utilization of photovoltaic generating system generating.At present,
Conventional power regulating method need voltage and electric current sample to realize the adjustment of power simultaneously.Due to electrical network
Entrance current sensing means, distant with load end power adjustment apparatus, added by wired connection
The length of sampling circuit and the difficulty of cabling, add the difficulty of installation, affects the attractive in appearance and electric of indoor simultaneously
Pressure is sampled with electric current simultaneously, and the accuracy of power regulating method also can be made to be affected.
Summary of the invention
The purpose of the present invention is intended at least solve one of above-mentioned technological deficiency, it is provided that a kind of photovoltaic generating system and
Its power regulating method.
The present invention provides the power regulating method of a kind of photovoltaic generating system, described power regulating method to include following
Step:
Configuration current data reception terminal is to obtain described current data, and wherein said current data includes under electric current
Time delay along zero crossing, current effective value and current power factor drop；
Configuration sampling terminal, gathers electrical network entrance potential, and stores instantaneous voltage；
According to described instantaneous voltage, it may be judged whether produce voltage rising edge zero crossing；
When producing voltage rising edge zero crossing, starting timing, until receiving described current data, obtaining
The time delay of voltage rising edge zero crossing；
According to described instantaneous voltage, obtain voltage effective value；
According to described current effective value and described voltage effective value, obtain the first apparent energy；
Time delay according to voltage rising edge zero crossing and the time delay of electric current trailing edge zero crossing, obtain
Time between voltage rising edge zero crossing and electric current trailing edge zero crossing；
According to the time between voltage rising edge zero crossing and electric current trailing edge zero crossing, obtain voltage power because of
Element and power flow direction；
According to described first apparent energy, voltage power factor and current power factor, obtain exporting wattful power
Rate size；
According to active power of output size and power flow direction, regulate the bearing power of described photovoltaic generating system.
Scheme from the above is it can be seen that by the separate power calculation algorithms of voltage x current, energy is accurately
Calculate the power of various distortion current, judge the flow direction of power, decrease current sensing means and adjust with power
The connection of engagement positions sampling circuit, installs simple, and the additionally separate power calculation algorithms of voltage x current reduces
Interference between the power calculation of voltage x current, improves the accuracy of power regulating method.
The present invention also provides for the power regulating method of a kind of photovoltaic generating system, and described photovoltaic generating system includes
It is arranged on the current sensing means of consumer networks entrance and is arranged on the power adjustment apparatus of load-side, described electricity
Flow detection device and power adjustment apparatus are connected by wireless telecommunications, and described power regulating method includes following step
Suddenly；
Current sensing means configuration sampling terminal, gathers electrical network entrance electric current, and stores current instantaneous value；
Current sensing means is according to described current instantaneous value, it may be judged whether produce electric current trailing edge zero crossing；
Current sensing means, when producing electric current trailing edge zero crossing, starts timing, until starting output current several
According to time, obtain the time delay of electric current trailing edge zero crossing；
Current sensing means generates the virtual voltage Tong Bu with described current instantaneous value according to described current instantaneous value
Instantaneous value and virtual voltage amplitude, and current effective value；
Current sensing means, according to the virtual instantaneous value of described current instantaneous value and voltage, obtains electric current active power；
Current sensing means, according to described current effective value and virtual voltage amplitude, obtains the second apparent energy；
Current sensing means, according to electric current active power and the second apparent energy, obtains current power factor；
The current sensing means described current data of output is to power adjustment apparatus, and wherein said current data includes
The time delay of electric current trailing edge zero crossing, current effective value and current power factor；
Power adjustment apparatus configuration current data receives terminal to obtain described current data；
Power adjustment apparatus configuration sampling terminal, gathers electrical network entrance potential, and stores instantaneous voltage；
Power adjustment apparatus is according to described instantaneous voltage, it may be judged whether produce voltage rising edge zero crossing；
Power adjustment apparatus, when producing voltage rising edge zero crossing, starts timing, until receiving described electricity
Flow data, obtains the time delay of voltage rising edge zero crossing；
Power adjustment apparatus, according to described instantaneous voltage, is calculated voltage effective value；
Power adjustment apparatus, according to described current effective value and described voltage effective value, is calculated the first apparent
Power；
Power adjustment apparatus is according to the time delay of voltage rising edge zero crossing and prolonging of electric current trailing edge zero crossing
Late the time, obtain the time between voltage rising edge zero crossing and electric current trailing edge zero crossing；
Power adjustment apparatus, according to the time between voltage rising edge zero crossing and electric current trailing edge zero crossing, obtains
To voltage power factor and power flow direction；
Power adjustment apparatus, according to described first apparent energy, voltage power factor and current power factor, obtains
To active power of output size；
Power adjustment apparatus, according to active power of output size and power flow direction, regulates described photovoltaic generating system
Bearing power.
Scheme from the above is it can be seen that by the separate power calculation algorithms of voltage x current, energy is accurately
Calculate the power of various distortion current, judge the flow direction of power, decrease current sensing means and adjust with power
The connection of engagement positions sampling circuit, installs simple, and the additionally separate power calculation algorithms of voltage x current reduces
Interference between the power calculation of voltage x current, improves the accuracy of power regulating method.
The present invention also provides for a kind of photovoltaic generating system, is connected with electrical network by ammeter, described photovoltaic generation system
System includes being arranged on the current sensing means of consumer networks entrance and being arranged on the power adjustment apparatus of load-side,
Described current sensing means and power adjustment apparatus are connected by wireless telecommunications；
Current sensing means is used for:
Configuration sampling terminal, gathers electrical network entrance electric current, and stores current instantaneous value；
According to described current instantaneous value, it may be judged whether produce electric current trailing edge zero crossing；
When producing electric current trailing edge zero crossing, start timing, until during output current data, obtaining under electric current
Time delay along zero crossing drops；
The virtual voltage instantaneous value Tong Bu with described current instantaneous value and virtual is generated according to described current instantaneous value
Voltage magnitude, and current effective value；
According to the virtual instantaneous value of described current instantaneous value and voltage, obtain electric current active power；
According to described current effective value and virtual voltage amplitude, obtain the second apparent energy；
According to electric current active power and the second apparent energy, obtain current power factor；
Exporting described current data to power adjustment apparatus, wherein said current data includes electric current trailing edge mistake
The time delay of zero point, current effective value and current power factor；
Power adjustment apparatus is configured to:
Configuration current data receives terminal to obtain described current data；
Configuration sampling terminal, gathers electrical network entrance potential, and stores instantaneous voltage；
According to described instantaneous voltage, it may be judged whether produce voltage rising edge zero crossing；
When producing voltage rising edge zero crossing, starting timing, until receiving described current data, obtaining
The time delay of voltage rising edge zero crossing；
According to described instantaneous voltage, it is calculated voltage effective value；
According to described current effective value and described voltage effective value, it is calculated the first apparent energy；
Time delay according to voltage rising edge zero crossing and the time delay of electric current trailing edge zero crossing, obtain
Time between voltage rising edge zero crossing and electric current trailing edge zero crossing；
According to the time between voltage rising edge zero crossing and electric current trailing edge zero crossing, obtain voltage power because of
Element and power flow direction；
According to described first apparent energy, voltage power factor and current power factor, obtain exporting wattful power
Rate size；
According to active power of output size and power flow direction, regulate the bearing power of described photovoltaic generating system.
From the scheme of said system it can be seen that by current sensing means and power adjustment apparatus are separately set
Put, connect to realize the separate power calculation algorithms of voltage and current by wireless telecommunications, thus realize institute
The bearing power stating photovoltaic generating system is adjusted, and voltage and current separate power calculation algorithms energy
Accurately calculate the power of various distortion current, judge the flow direction of power, decrease current sensing means and merit
The connection of rate adjusting apparatus sampling circuit, installs simple, the additionally separate power calculation algorithms of voltage x current,
Reduce the interference between the power calculation of voltage x current, improve the accuracy of power regulating method.
Accompanying drawing explanation
Fig. 1 is the structured flowchart of a kind of embodiment of photovoltaic generating system of the present invention；
Fig. 2 is the flow chart of the power regulating method first embodiment of photovoltaic generating system of the present invention；
Fig. 3 is the flow chart of power regulating method second embodiment of photovoltaic generating system of the present invention；
Fig. 4 is the flow chart of a kind of embodiment of electric current detecting method of the present invention；
Fig. 5 is the flow chart of a kind of embodiment of voltage power method of adjustment of the present invention.
Detailed description of the invention
In order to make technical problem solved by the invention, technical scheme and beneficial effect clearer, with
Lower combination drawings and Examples, are further elaborated to the present invention.Should be appreciated that described herein
Specific embodiment only in order to explain the present invention, be not intended to limit the present invention.
The present invention provides the photovoltaic generating system 1 of a kind of embodiment, is connected with electrical network 3 by ammeter 2, such as figure
Shown in 1, described photovoltaic generating system 1 includes: be arranged on current sensing means 10 He of consumer networks entrance
It is arranged on the power adjustment apparatus 20 of load-side, described current sensing means 10 and power adjustment apparatus 20 to lead to
Crossing wireless telecommunications to connect, say, that arrange wireless transmitter module in current sensing means 10, power adjusts dress
Wireless receiving module it is provided with, to realize the wireless of current sensing means 10 and power adjustment apparatus 20 in putting 20
Connect.Described photovoltaic generating system 1 also includes solar panel 30, inverter 40, and first loads 50,
Second load 60 and the 3rd load 70, described 3rd load 70 is by power adjustment apparatus 20 and described electricity
First end of table 2 connects, and the first load 50 and the second load 60 are respectively with the first end of described ammeter 2 even
Connecing, the second end of described ammeter 2 is connected with described electrical network 3, and described solar panel 30 passes through inverter
40 load 50 and the respectively with described ammeter 2, power adjustment apparatus 20, current sensing means 10, first
Two load 60 connections.
In being embodied as current sensing means 10 for:
Configuration sampling terminal, gathers electrical network entrance electric current, and stores current instantaneous value；
According to described current instantaneous value, it may be judged whether produce electric current trailing edge zero crossing；
When producing electric current trailing edge zero crossing, starting timing, during until starting output current data, obtaining electricity
The time delay of stream trailing edge zero crossing；
The virtual voltage instantaneous value Tong Bu with described current instantaneous value and virtual is generated according to described current instantaneous value
Voltage magnitude, and current effective value；
According to the virtual instantaneous value of described current instantaneous value and voltage, obtain electric current active power；
According to described current effective value and virtual voltage amplitude, obtain the second apparent energy；
According to electric current active power and the second apparent energy, obtain current power factor；
Export described current data and include electric current trailing edge to power adjustment apparatus 20, wherein said current data
The time delay of zero crossing, current effective value and current power factor；
Power adjustment apparatus 20 is configured to:
Configuration current data receives terminal to obtain described current data；
Configuration sampling terminal, gathers electrical network entrance potential, and stores instantaneous voltage；
According to described instantaneous voltage, it may be judged whether produce voltage rising edge zero crossing；
When producing voltage rising edge zero crossing, starting timing, until receiving described current data, obtaining
The time delay of voltage rising edge zero crossing；
According to described instantaneous voltage, it is calculated voltage effective value；
According to described current effective value and described voltage effective value, it is calculated the first apparent energy；
Time delay according to voltage rising edge zero crossing and the time delay of electric current trailing edge zero crossing, obtain
Time between voltage rising edge zero crossing and electric current trailing edge zero crossing；
According to the time between voltage rising edge zero crossing and electric current trailing edge zero crossing, obtain voltage power because of
Element and power flow direction；
According to described first apparent energy, voltage power factor and current power factor, obtain exporting wattful power
Rate size；
According to active power of output size and power flow direction, regulate the bearing power of described photovoltaic generating system 1.
In being embodied as, power adjustment apparatus 20 is additionally operable to:
Obtain from being sent to receive the communication delay time of described current data；
According to described communication delay time, the time delay of voltage rising edge zero crossing and electric current trailing edge zero passage
The time delay of point, obtain the time between voltage rising edge zero crossing and electric current trailing edge zero crossing.
From the scheme of said system it can be seen that by current sensing means and power adjustment apparatus are separately set
Put, connect to realize the separate power calculation algorithms of voltage and current by wireless telecommunications, thus realize institute
The bearing power stating photovoltaic generating system is adjusted, and voltage and current separate power calculation algorithms energy
Accurately calculate the power of various distortion current, judge the flow direction of power, decrease current sensing means and merit
The connection of rate adjusting apparatus sampling circuit, installs simple.It addition, the separate power calculation algorithms of voltage x current,
Reduce the interference between the power calculation of voltage x current, improve the accuracy of power regulating method.
In being embodied as, Fig. 2 is the power regulating method first embodiment of photovoltaic generating system of the present invention
Flow chart.As in figure 2 it is shown, the present invention provides the power regulating method of the photovoltaic generating system of a kind of embodiment,
Described power regulating method includes:
Step S10, configuration current data receives terminal to obtain described current data, wherein said current data
Including the time delay of electric current trailing edge zero crossing, current effective value and current power factor；
Step S20, configuration sampling terminal, gather electrical network entrance potential, and store instantaneous voltage, described electricity
Pressure instantaneous value is designated as u respectively1、u2...、un；
Step S30, according to described instantaneous voltage, it may be judged whether produce voltage rising edge zero crossing, when not having
When producing pressure rising edge zero crossing, enter step S20, when producing voltage rising edge zero passage, enter step S40；
Step S40, when producing voltage rising edge zero crossing, starts timing, until receiving described electric current number
According to, obtain the time delay of voltage rising edge zero crossing；
Step S50, according to described instantaneous voltage, is calculated voltage effective value；
Step S60, according to described current effective value and described voltage effective value, is calculated the first apparent energy；
Step S70, during according to the delay of time delay of voltage rising edge zero crossing and electric current trailing edge zero crossing
Between, obtain the time between voltage rising edge zero crossing and electric current trailing edge zero crossing；
Step S80, according to the time between voltage rising edge zero crossing and electric current trailing edge zero crossing, obtains electricity
Pressure power factor (PF) and power flow direction；
Step S90, according to described first apparent energy, voltage power factor and current power factor, obtains defeated
Go out active power size；
Step S100, according to active power of output size and power flow direction, regulates described photovoltaic generating system
Bearing power.
In step slo, this wireless data receives and is configured to terminal form, in above-mentioned processing procedure, excellent
First process this receiving terminal.This reception terminal is mainly used in described current data.
In step s 40, configure first timer, produce the moment to connecing for recording voltage rising edge zero crossing
Time delay T by electric current trailing edge over-current signal2, i.e. it is mainly used in calculating voltage rising edge zero passage and electric current
The time of trailing edge zero passage.It is to say, reset the first timing after voltage rising edge zero cross signal being detected
Device, then starts timing, until stopping timing when receiving described current data.
In step s 50, the computing formula obtaining voltage effective value Urms is as follows:Wherein, the number of the voltage instantaneous value that n samples in being a sampling period.
In step S60, the computing formula obtaining the first apparent energy S1 is as follows: S1=Irms1*Urms。
It is to say, receive, by wireless receiving module, the current effective value Irms that current sensing means sends1, connect
By current effective value Irms1With voltage effective value Urms, calculate the first apparent energy S1.
In step S70, particularly as follows: T=(T2-T1) %K, wherein, T is voltage rising edge zero crossing and electricity
Time between stream trailing edge zero crossing, T2For the time delay of voltage rising edge zero crossing, T1Decline for electric current
Along the time delay of zero crossing, K is the cycle of electrical network, and value is 20000us.It is to say, wireless receiving
Module receives the electric current trailing edge time delay T that current sensing means transmits1, voltage rising edge zero crossing is to connecing
Time delay T by electric current trailing edge zero crossing2, calculate voltage rising edge zero crossing and electric current trailing edge mistake
Time T between zero point.
Scheme from the above is it can be seen that by the separate power calculation algorithms of voltage x current, energy is accurately
Calculate the power of various distortion current, judge the flow direction of power, decrease current sensing means and adjust with power
The connection of engagement positions sampling circuit, installs simple.The additionally separate power calculation algorithms of voltage x current, reduces
Interference between the power calculation of voltage x current, improves the accuracy of power regulating method.
In being embodied as, Fig. 3 is the stream of power regulating method second embodiment of photovoltaic generating system of the present invention
Cheng Tu.As it is shown on figure 3, step S70 specifically includes following steps:
Step S71, obtains from being sent to receive the communication delay time T of described current data3；
Step S72, according under described communication delay time, the time delay of voltage rising edge zero crossing and electric current
Drop along time delay of zero crossing, obtain between voltage rising edge zero crossing and electric current trailing edge zero crossing time
Between.
In step S71, communication delay time T3For current sensing means wireless communication module send data with
Power adjustment apparatus accepts the time delay that data cause, and this time delay is fast with the transmission of wireless communication module
Degree is relevant, can measure and obtain.Measure T3If, the result of calculation that can make power is more accurate.
In step S72, the calculating of the time between voltage rising edge zero crossing and electric current trailing edge zero crossing
Formula is: T=(T2-T3-T1) %K；Wherein, T is voltage rising edge zero crossing and electric current trailing edge zero crossing
Between time, T2For the time delay of voltage rising edge zero crossing, T1Delay for electric current trailing edge zero crossing
Time, T3For the communication delay time, K is the cycle of electrical network, and value is that 20000us, i.e. computing formula are:
T=(T2-T3-T1) %20000.
In being embodied as, step S80, specifically include:
Step S81, it is judged that the time between voltage rising edge zero crossing and electric current trailing edge zero crossing is pre-with first
If cycle K1, the relation between the second predetermined period K2, and the 3rd predetermined period K3, obtain voltage power
Factor；
As T >=K1, voltage power factor=cos [(K-T)/K*2*pi]；
As K2≤T < K1, voltage power factor=cos [(K1-T)/K*2*pi]；
As K3 < T < K2, voltage power factor=cos [(K2-T)/K*2*pi]；
Step S82, it is judged that the time between voltage rising edge zero crossing and electric current trailing edge zero crossing is pre-with first
If the relation between cycle K1 and the 3rd predetermined period K3, obtain power flow direction；
As K3 < T, < during K1, current direction is just, from electrical network power taking；
As T >=K1 or T≤K3, current direction is negative, current direction electrical network；
Wherein, pi is pi, T be between voltage rising edge zero crossing and electric current trailing edge zero crossing time
Between.
In step S82, current sensing means according to current Hall connection from electrical network power taking for be just attached.
When the first predetermined period K1 value is 15000us, and the second predetermined period K2 value is 10000us, the 3rd
During predetermined period K3 value 5000us, determine between voltage rising edge zero crossing and electric current trailing edge zero crossing
Time T and the first predetermined period K1, the relation between the second predetermined period K2, and the 3rd predetermined period K3,
To voltage power factor PF2, concrete formula is as follows:
When T >=15000, PF2=cos [(20000-T)/20000*2*pi]
When 10000≤T < when 15000, PF2=cos [(15000-T)/20000*2*pi]
When 5000 < T < when 10000, PF2=cos [(10000-T)/20000*2*pi]
When T≤5000, PF2=cos [T/20000*2*pi].
When the first predetermined period K1 value is 15000us, and the second predetermined period K2 value is 10000us, the 3rd
During predetermined period K3 value 5000us, determine between voltage rising edge zero crossing and electric current trailing edge zero crossing
Relation between time T and the first predetermined period K1, and the 3rd predetermined period K3, obtains power flow direction, specifically
Formula is as follows:
When 5000 < T, < when 15000, electric current is just, from electrical network power taking；
During when T≤5000 or when T >=15000, electric current is negative, current direction electrical network.
In being embodied as, the present invention provides the power adjustment side of the photovoltaic generating system of the third embodiment
Method, described photovoltaic generating system includes the current sensing means being arranged on consumer networks entrance and is arranged on load
The power adjustment apparatus of side, described current sensing means and power adjustment apparatus connected by wireless telecommunications, institute
State power regulating method to include: the electric current detecting method of a kind of embodiment as shown in Figure 4 and as shown in Figure 5
A kind of voltage power method of adjustment of embodiment.As shown in Figure 4, electric current detecting method specifically includes following step
Rapid:
Step S101, current sensing means configuration sampling terminal, gather electrical network entrance electric current, and store electric current
Instantaneous value, described current instantaneous value is designated as i respectively1、i2...、in；
Step S201, current sensing means is according to described current instantaneous value, it may be judged whether produce electric current trailing edge
Zero crossing, time if not, returns step S101, if it is, enter step S301；
Step S301, current sensing means, when producing electric current trailing edge zero crossing, starts timing, until output
During current data, obtain the time delay of electric current trailing edge zero crossing；
Step S401, current sensing means generates Tong Bu with described current instantaneous value according to described current instantaneous value
Virtual voltage instantaneous value and virtual voltage amplitude, and current effective value；
Step S501, current sensing means, according to the virtual instantaneous value of described current instantaneous value and voltage, obtains electricity
Stream active power；
Step S601, current sensing means, according to described current effective value and virtual voltage amplitude, obtains second
Apparent energy；
Step S701, current sensing means, according to electric current active power and the second apparent energy, obtains electric current merit
Rate factor；
Step S801, current sensing means export described current data to power adjustment apparatus, wherein said electricity
Flow data includes the time delay of electric current trailing edge zero crossing, current effective value and current power factor, enters
Step S110.
In step S301, configure second timer, decline zero crossing for record current and produce the moment to sending out
Sending the time delay between data, it is mainly data and processes the time delay caused.It is to say, detect
Reset second timer after electric current trailing edge zero cross signal, then start timing, until sending described electric current number
According to time stop timing.
In step S401, the virtual voltage signal with current synchronization, virtual voltage amplitude is V1, this voltage is believed
Number being also adopted by discrete processes, the sampling period is consistent with the current sample cycle, and is designated as v1、v2...、vn.Separately
Outward, according to the current instantaneous value sampled in the cycle, calculating current virtual value Irms1The calculating of Urms is public
Formula is as follows:Wherein, the electric current instant value that n samples in being a sampling period
Number.
In step S501, described current instantaneous value and the virtual instantaneous value of voltage, calculate electric current active-power P1:
In step s 601, current sensing means is according to described current effective value Irms1With virtual voltage amplitude V1,
Obtain the second apparent energy S2, computing formula is as follows: S2=Irms1*V1。
In step s 701, current sensing means is according to electric current active-power P1With the second apparent energy S2, obtain
Current power factor PF1, computing formula is as follows: PF1=P1/S2。
As it is shown in figure 5, the present invention provides the voltage power method of adjustment of the photovoltaic generating system of a kind of embodiment,
Described voltage power method of adjustment includes:
Step S110, power adjustment apparatus configuration current data receive terminal to obtain described current data, its
Described in current data include time delay of electric current trailing edge zero crossing, current effective value and current power because of
Element；
Step S120, power adjustment apparatus configuration sampling terminal, gather electrical network entrance potential, and store voltage
Instantaneous value, described instantaneous voltage is designated as u respectively1、u2...、un；
Step S130, power adjustment apparatus is according to described instantaneous voltage, it may be judged whether produce voltage rising edge
Zero crossing, when not producing pressure rising edge zero crossing, enters step S120, when producing voltage rising edge mistake
Zero, enter step S40；
Step S140, power adjustment apparatus, when producing voltage rising edge zero crossing, starts timing, until connecing
Receive described current data, obtain the time delay of voltage rising edge zero crossing；
Step S150, power adjustment apparatus, according to described instantaneous voltage, is calculated voltage effective value；
Step S160, power adjustment apparatus, according to described current effective value and described voltage effective value, calculates
To the first apparent energy；
Step S170, power adjustment apparatus is according to time delay of voltage rising edge zero crossing and electric current trailing edge
The time delay of zero crossing, obtain the time between voltage rising edge zero crossing and electric current trailing edge zero crossing；
Step S180, power adjustment apparatus is according between voltage rising edge zero crossing and electric current trailing edge zero crossing
Time, obtain voltage power factor and power flow direction；
Step S190, power adjustment apparatus is according to described first apparent energy, voltage power factor and electric current merit
Rate factor, obtains active power of output size；
Step S1100, power adjustment apparatus, according to active power of output size and power flow direction, regulates described light
The bearing power of photovoltaic generating system.
In step s 110, this wireless data receives and is configured to terminal form, in above-mentioned processing procedure, excellent
First process this receiving terminal.This reception terminal is mainly used in described current data.
In step S140, power adjustment apparatus configuration first timer, for recording voltage rising edge zero crossing
Produce the moment to the time delay T receiving electric current trailing edge over-current signal2, i.e. it is mainly used in calculating voltage and rises
Time along zero passage Yu electric current trailing edge zero passage.It is to say, after voltage rising edge zero cross signal being detected
Reset first timer, then start timing, until stopping timing when receiving described current data.
In step S150, the computing formula obtaining voltage effective value Urms is as follows:Wherein, the number of the voltage instantaneous value that n samples in being a sampling period.
In step S160, the computing formula obtaining the first apparent energy S1 is as follows: S1=Irms1*Urms。
It is to say, receive, by wireless receiving module, the current effective value Irms that current sensing means sends1, connect
By current effective value Irms1With voltage effective value Urms, calculate the first apparent energy S1.
In step S170, particularly as follows: T=(T2-T1) %K, wherein, T be voltage rising edge zero crossing with
Time between electric current trailing edge zero crossing, T2For the time delay of voltage rising edge zero crossing, T1For under electric current
Dropping the time delay along zero crossing, K is the cycle of electrical network, and value is 20000us.Connect it is to say, wireless
Receive module and receive the electric current trailing edge time delay T that current sensing means transmits1, voltage rising edge zero crossing arrives
Receive the time delay T of electric current trailing edge zero crossing2, calculate voltage rising edge zero crossing and electric current trailing edge
Time T between zero crossing.
Scheme from the above is it can be seen that by the separate power calculation algorithms of voltage x current, energy is accurately
Calculate the power of various distortion current, judge the flow direction of power, decrease current sensing means and adjust with power
The connection of engagement positions sampling circuit, installs simple, and the additionally separate power calculation algorithms of voltage x current reduces
Interference between the power calculation of voltage x current, improves the accuracy of power regulating method.
In being embodied as, step S170 specifically includes following steps:
Step S171, obtains from being sent to receive the communication delay time T of described current data3；
Step S172, according to described communication delay time, the time delay of voltage rising edge zero crossing and electric current
The time delay of trailing edge zero crossing, obtain between voltage rising edge zero crossing and electric current trailing edge zero crossing
Time.
In step S171, communication delay time T3For current sensing means wireless communication module send data with
Power adjustment apparatus accepts the time delay that data cause, and this time delay is fast with the transmission of wireless communication module
Degree is relevant, can measure and obtain.Measure T3If, the result of calculation that can make power is more accurate.
In step S172, the calculating of the time between voltage rising edge zero crossing and electric current trailing edge zero crossing
Formula is: T=(T2-T3-T1) %K；Wherein, T is voltage rising edge zero crossing and electric current trailing edge zero crossing
Between time, T2For the time delay of voltage rising edge zero crossing, T1Delay for electric current trailing edge zero crossing
Time, T3For the communication delay time, K is the cycle of electrical network, and value is that 20000us, i.e. computing formula are:
T=(T2-T3-T1) %20000.
In being embodied as, step S180, specifically include:
Step S81, it is judged that the time between voltage rising edge zero crossing and electric current trailing edge zero crossing is pre-with first
If cycle K1, the relation between the second predetermined period K2, and the 3rd predetermined period K3, obtain voltage power
Factor；
As T >=K1, voltage power factor=cos [(K-T)/K*2*pi]；
As K2≤T < K1, voltage power factor=cos [(K1-T)/K*2*pi]；
As K3 < T < K2, voltage power factor=cos [(K2-T)/K*2*pi]；
Step S182, it is judged that the time and first between voltage rising edge zero crossing and electric current trailing edge zero crossing
Relation between predetermined period K1 and the 3rd predetermined period K3, obtains power flow direction；
As K3 < T, < during K1, current direction is just, from electrical network power taking；
As T >=K1 or T≤K3, current direction is negative, current direction electrical network；
Wherein, pi is pi, T be between voltage rising edge zero crossing and electric current trailing edge zero crossing time
Between.
In step S182, current sensing means according to current Hall connection from electrical network power taking for be just attached.
When the first predetermined period K1 value is 15000us, and the second predetermined period K2 value is 10000us, the 3rd
During predetermined period K3 value 5000us, determine between voltage rising edge zero crossing and electric current trailing edge zero crossing
Time T and the first predetermined period K1, the relation between the second predetermined period K2, and the 3rd predetermined period K3,
To voltage power factor PF2, concrete formula is as follows:
When T >=15000, PF2=cos [(20000-T)/20000*2*pi]
When 10000≤T < when 15000, PF2=cos [(15000-T)/20000*2*pi]
When 5000 < T < when 10000, PF2=cos [(10000-T)/20000*2*pi]
When T≤5000, PF2=cos [T/20000*2*pi].
When the first predetermined period K1 value is 15000us, and the second predetermined period K2 value is 10000us, the 3rd
During predetermined period K3 value 5000us, determine between voltage rising edge zero crossing and electric current trailing edge zero crossing
Relation between time T and the first predetermined period K1, and the 3rd predetermined period K3, obtains power flow direction, specifically
Formula is as follows:
When 5000 < T, < when 15000, electric current is just, from electrical network power taking；
During when T≤5000 or when T >=15000, electric current is negative, current direction electrical network.
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all at this
Any amendment, equivalent and the improvement etc. made within bright spirit and principle, should be included in the present invention
Protection domain within.
Claims (6)
1. the power regulating method of a photovoltaic generating system, it is characterised in that: described photovoltaic generating system bag
Include the current sensing means being arranged on consumer networks entrance and the power adjustment apparatus being arranged on load-side, described
Current sensing means and power adjustment apparatus are connected by wireless telecommunications, and described power regulating method includes following
Step；
Current sensing means configuration sampling terminal, gathers electrical network entrance electric current, and stores current instantaneous value；
Current sensing means is according to described current instantaneous value, it may be judged whether produce electric current trailing edge zero crossing；
Current sensing means, when producing electric current trailing edge zero crossing, starts timing, until starting output current several
According to time, obtain the time delay of electric current trailing edge zero crossing；
Current sensing means generates the virtual voltage Tong Bu with described current instantaneous value according to described current instantaneous value
Instantaneous value and virtual voltage amplitude, and current effective value；
Current sensing means, according to the virtual instantaneous value of described current instantaneous value and voltage, obtains electric current active power；
Current sensing means, according to described current effective value and virtual voltage amplitude, obtains the second apparent energy；
Current sensing means, according to electric current active power and the second apparent energy, obtains current power factor；
The current sensing means described current data of output is to power adjustment apparatus, and wherein said current data includes
The time delay of electric current trailing edge zero crossing, current effective value and current power factor；
Power adjustment apparatus configuration current data receives terminal to obtain described current data；
Power adjustment apparatus configuration sampling terminal, gathers electrical network entrance potential, and stores instantaneous voltage；
Power adjustment apparatus is according to described instantaneous voltage, it may be judged whether produce voltage rising edge zero crossing；
Power adjustment apparatus, when producing voltage rising edge zero crossing, starts timing, until receiving described electricity
Flow data, obtains the time delay of voltage rising edge zero crossing；
Power adjustment apparatus, according to described instantaneous voltage, is calculated voltage effective value；
Power adjustment apparatus, according to described current effective value and described voltage effective value, is calculated the first apparent
Power；
Power adjustment apparatus is according to the time delay of voltage rising edge zero crossing and prolonging of electric current trailing edge zero crossing
Late the time, obtain the time between voltage rising edge zero crossing and electric current trailing edge zero crossing；
Power adjustment apparatus, according to the time between voltage rising edge zero crossing and electric current trailing edge zero crossing, obtains
To voltage power factor and power flow direction；
Power adjustment apparatus, according to described first apparent energy, voltage power factor and current power factor, obtains
To active power of output size；
Power adjustment apparatus, according to active power of output size and power flow direction, regulates described photovoltaic generating system
Bearing power.
2. power regulating method as claimed in claim 1, it is characterised in that: described power adjustment apparatus root
According to time delay and the time delay of electric current trailing edge zero crossing of voltage rising edge zero crossing, obtain on voltage
Rise along the step of the time between zero crossing and electric current trailing edge zero crossing, specifically include following steps:
Power adjustment apparatus obtains from being sent to receive the communication delay time of described current data；
Power adjustment apparatus is according to described communication delay time, the time delay of voltage rising edge zero crossing and electricity
The time delay of stream trailing edge zero crossing, obtain between voltage rising edge zero crossing and electric current trailing edge zero crossing
Time.
3. power regulating method as claimed in claim 2, it is characterised in that: described power adjustment apparatus root
According to prolonging of described communication delay time, the time delay of voltage rising edge zero crossing and electric current trailing edge zero crossing
The late time, obtain the step of time between voltage rising edge zero crossing and electric current trailing edge zero crossing, specifically
For:
T=(T2-T3-T1) %K；
Wherein, T is the time between voltage rising edge zero crossing and electric current trailing edge zero crossing, T2For on voltage
Rise the time delay along zero crossing, T1For the time delay of electric current trailing edge zero crossing, T3For the communication delay time,
K is the cycle of electrical network.
4. power regulating method as claimed in claim 3, it is characterised in that:
Described power adjustment apparatus according between voltage rising edge zero crossing and electric current trailing edge zero crossing time
Between, obtain voltage power factor and power flow direction, particularly as follows:
Judge the time between voltage rising edge zero crossing and electric current trailing edge zero crossing and the first predetermined period
K1, the relation between the second predetermined period K2, and the 3rd predetermined period K3, obtain voltage power factor；
As T >=K1, voltage power factor=cos [(K-T)/K*2*pi]；
As K2≤T < K1, voltage power factor=cos [(K1-T)/K*2*pi]；
As K3 < T < K2, voltage power factor=cos [(K2-T)/K*2*pi]；
Judge the time between voltage rising edge zero crossing and electric current trailing edge zero crossing and the first predetermined period K1
And the relation that the 3rd between predetermined period K3, obtain power flow direction；
As K3 < T, < during K1, current direction is just, from electrical network power taking；
As T >=K1 or T≤K3, current direction is negative, current direction electrical network；
Wherein, pi is pi, T be between voltage rising edge zero crossing and electric current trailing edge zero crossing time
Between.
5. a photovoltaic generating system, is connected with electrical network by ammeter, it is characterised in that: described photovoltaic generation
System includes the current sensing means being arranged on consumer networks entrance and is arranged on the power adjustment dress of load-side
Putting, described current sensing means and power adjustment apparatus are connected by wireless telecommunications；
Current sensing means is used for:
Configuration sampling terminal, gathers electrical network entrance electric current, and stores current instantaneous value；
According to described current instantaneous value, it may be judged whether produce electric current trailing edge zero crossing；
When producing electric current trailing edge zero crossing, start timing, until during output current data, obtaining under electric current
Time delay along zero crossing drops；
The virtual voltage instantaneous value Tong Bu with described current instantaneous value and virtual is generated according to described current instantaneous value
Voltage magnitude, and current effective value；
According to the virtual instantaneous value of described current instantaneous value and voltage, obtain electric current active power；
According to described current effective value and virtual voltage amplitude, obtain the second apparent energy；
According to electric current active power and the second apparent energy, obtain current power factor；
Exporting described current data to power adjustment apparatus, wherein said current data includes electric current trailing edge mistake
The time delay of zero point, current effective value and current power factor；
Power adjustment apparatus is configured to:
Configuration current data receives terminal to obtain described current data；
Configuration sampling terminal, gathers electrical network entrance potential, and stores instantaneous voltage；
According to described instantaneous voltage, it may be judged whether produce voltage rising edge zero crossing；
When producing voltage rising edge zero crossing, starting timing, until receiving described current data, obtaining
The time delay of voltage rising edge zero crossing；
According to described instantaneous voltage, it is calculated voltage effective value；
According to described current effective value and described voltage effective value, it is calculated the first apparent energy；
Time delay according to voltage rising edge zero crossing and the time delay of electric current trailing edge zero crossing, obtain
Time between voltage rising edge zero crossing and electric current trailing edge zero crossing；
According to the time between voltage rising edge zero crossing and electric current trailing edge zero crossing, obtain voltage power because of
Element and power flow direction；
According to described first apparent energy, voltage power factor and current power factor, obtain exporting wattful power
Rate size；
According to active power of output size and power flow direction, regulate the bearing power of described photovoltaic generating system.
6. photovoltaic generating system as claimed in claim 5, it is characterised in that: power adjustment apparatus is additionally operable to:
Obtain from being sent to receive the communication delay time of described current data；
According to described communication delay time, the time delay of voltage rising edge zero crossing and electric current trailing edge zero passage
The time delay of point, obtain the time between voltage rising edge zero crossing and electric current trailing edge zero crossing.
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| CN203025602U (en) * | 2013-01-09 | 2013-06-26 | 深圳市索源科技有限公司 | Maximum power point tracking solar panel voltage output device |
| CN103236803A (en) * | 2013-04-11 | 2013-08-07 | 深圳市晶福源电子技术有限公司 | MPPT (maximum power point tracking) control method of photovoltaic inverter |
| CN104426160A (en) * | 2013-08-27 | 2015-03-18 | 中国船舶重工集团公司第七一三研究所 | Positive and negative sequence decoupling control method for low-voltage ride-through compatible with grid-connected photovoltaic inverter |
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| US8319483B2 (en) * | 2007-08-06 | 2012-11-27 | Solaredge Technologies Ltd. | Digital average input current control in power converter |
| KR101057684B1 (en) * | 2011-03-31 | 2011-08-18 | 주식회사 동운아나텍 | Light driving apparatus |
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| CN203025602U (en) * | 2013-01-09 | 2013-06-26 | 深圳市索源科技有限公司 | Maximum power point tracking solar panel voltage output device |
| CN103236803A (en) * | 2013-04-11 | 2013-08-07 | 深圳市晶福源电子技术有限公司 | MPPT (maximum power point tracking) control method of photovoltaic inverter |
| CN104426160A (en) * | 2013-08-27 | 2015-03-18 | 中国船舶重工集团公司第七一三研究所 | Positive and negative sequence decoupling control method for low-voltage ride-through compatible with grid-connected photovoltaic inverter |
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