CN104881074A - Photovoltaic power generation system and method for adjusting power of photovoltaic power generation system - Google Patents
Photovoltaic power generation system and method for adjusting power of photovoltaic power generation system Download PDFInfo
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Abstract
The invention provides a method for adjusting the power of a photovoltaic power generation system. The method includes the steps of judging whether a voltage rising edge zero crossing point is generated or not according to a voltage instantaneous value; when the voltage rising edge zero crossing point is generated, starting timing, and obtaining delay time of the voltage rising edge zero crossing point; obtaining a voltage effective value according to the voltage instantaneous value; obtaining the first apparent power according to a current effective value and the voltage effective value; obtaining the time between the voltage rising edge zero crossing point and a current falling edge zero crossing point according to the delay time of the voltage rising edge zero crossing point and the delay time of the current falling edge zero crossing point; obtaining a voltage power factor and a power flow direction according to the time between the voltage rising edge zero crossing point and the current falling edge zero crossing point; obtaining the output active power according to the first apparent power, the voltage power factor and a current power factor; adjusting the load power of the photovoltaic power generation system according to the output active power and the power flowing direction.
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, needing the power direction and the size that detect consumer networks entrance in real time, to adjust bearing power, realizing the maximum utilization of photovoltaic generating system generating.At present, need voltage and electric current to sample to realize the adjustment of power in conventional power regulating method simultaneously.Due to electrical network entrance current sensing means, distant with load end power adjustment apparatus, the length of sampling circuit and the difficulty of cabling is added by wired connection, add the difficulty of installation, affect indoor attractive in appearance and voltage and electric current to sample simultaneously simultaneously, the accuracy of power regulating method also can be made to be affected.
Summary of the invention
Object of the present invention is intended at least solve one of above-mentioned technological deficiency, provide a kind of photovoltaic generating system and power regulating method.
The invention provides a kind of power regulating method of photovoltaic generating system, described power regulating method comprises the following steps:
Configuration current data receive interruption is to obtain described current data, and wherein said current data comprises the time delay of electric current negative edge zero crossing, current effective value and current power factor;
Configuration Sampling interrupt, gathers electrical network entrance potential, and storage voltage instantaneous value;
According to described instantaneous voltage, judge whether to produce voltage rising edge zero crossing;
When producing voltage rising edge zero crossing, starting timing, until receive 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 applied power;
According to the time delay of voltage rising edge zero crossing and the time delay of electric current negative edge zero crossing, obtain the time between voltage rising edge zero crossing and electric current negative edge zero crossing;
According to the time between voltage rising edge zero crossing and electric current negative edge zero crossing, obtain voltage power factor and power flow direction;
According to described first applied power, 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.
As can be seen from the scheme of said method, by the power calculation algorithms that electric current and voltage separates, accurately can calculate the power of various distortion current, judge the flow direction of power, decrease the connection of current sensing means and power adjustment apparatus sampling circuit, install simple, the power calculation algorithms that separates of electric current and voltage in addition, the interference between the power calculation reducing electric current and voltage, improves the accuracy of power regulating method.
The present invention also provides a kind of power regulating method of photovoltaic generating system, described photovoltaic generating system comprises the current sensing means being arranged on consumer networks entrance and the power adjustment apparatus being arranged on load-side, described current sensing means is connected by wireless telecommunications with power adjustment apparatus, and described power regulating method comprises the following steps;
Current sensing means configuration Sampling interrupt, gathers electrical network entrance electric current, and storaging current instantaneous value;
Current sensing means, according to described current instantaneous value, judges whether generation current negative edge zero crossing;
Current sensing means, when generation current negative edge zero crossing, starts timing, until when starting output current data, obtain the time delay of electric current negative edge zero crossing;
Current sensing means generates the virtual voltage instantaneous value synchronous with described current instantaneous value and virtual voltage amplitude according to described current instantaneous value, and current effective value;
Current sensing means, according to described current instantaneous value and the virtual instantaneous value of voltage, obtains electric current active power;
Current sensing means, according to described current effective value and virtual voltage amplitude, obtains the second applied power;
Current sensing means, according to electric current active power and the second applied power, obtains current power factor;
Current sensing means exports described current data to power adjustment apparatus, and wherein said current data comprises the time delay of electric current negative edge zero crossing, current effective value and current power factor;
Power adjustment apparatus configuration current data receive interruption is to obtain described current data;
Power adjustment apparatus configuration Sampling interrupt, gathers electrical network entrance potential, and storage voltage instantaneous value;
Power adjustment apparatus, according to described instantaneous voltage, judges whether to produce voltage rising edge zero crossing;
Power adjustment apparatus, when producing voltage rising edge zero crossing, starts timing, until receive described current data, obtains the time delay of voltage rising edge zero crossing;
Power adjustment apparatus, according to described instantaneous voltage, calculates voltage effective value;
Power adjustment apparatus, according to described current effective value and described voltage effective value, calculates the first applied power;
Power adjustment apparatus, according to the time delay of the time delay of voltage rising edge zero crossing and electric current negative edge zero crossing, obtains the time between voltage rising edge zero crossing and electric current negative edge zero crossing;
Power adjustment apparatus, according to the time between voltage rising edge zero crossing and electric current negative edge zero crossing, obtains voltage power factor and power flow direction;
Power adjustment apparatus is according to described first applied power, and voltage power factor and current power factor, obtain active power of output size;
Power adjustment apparatus, according to active power of output size and power flow direction, regulates the bearing power of described photovoltaic generating system.
As can be seen from the scheme of said method, by the power calculation algorithms that electric current and voltage separates, accurately can calculate the power of various distortion current, judge the flow direction of power, decrease the connection of current sensing means and power adjustment apparatus sampling circuit, install simple, the power calculation algorithms that separates of electric current and voltage in addition, the interference between the power calculation reducing electric current and voltage, improves the accuracy of power regulating method.
The present invention also provides a kind of photovoltaic generating system, be connected with electrical network by ammeter, described photovoltaic generating system comprises the current sensing means being arranged on consumer networks entrance and the power adjustment apparatus being arranged on load-side, and described current sensing means is connected by wireless telecommunications with power adjustment apparatus;
Current sensing means is used for:
Configuration Sampling interrupt, gathers electrical network entrance electric current, and storaging current instantaneous value;
According to described current instantaneous value, judge whether generation current negative edge zero crossing;
When generation current negative edge zero crossing, start timing, until during output current data, obtain the time delay of electric current negative edge zero crossing;
The virtual voltage instantaneous value synchronous with described current instantaneous value and virtual voltage amplitude is generated according to described current instantaneous value, and current effective value;
According to described current instantaneous value and the virtual instantaneous value of voltage, obtain electric current active power;
According to described current effective value and virtual voltage amplitude, obtain the second applied power;
According to electric current active power and the second applied power, obtain current power factor;
Export described current data to power adjustment apparatus, wherein said current data comprises the time delay of electric current negative edge zero crossing, current effective value and current power factor;
Power adjustment apparatus is configured for:
Configuration current data receive interruption is to obtain described current data;
Configuration Sampling interrupt, gathers electrical network entrance potential, and storage voltage instantaneous value;
According to described instantaneous voltage, judge whether to produce voltage rising edge zero crossing;
When producing voltage rising edge zero crossing, starting timing, until receive described current data, obtaining the time delay of voltage rising edge zero crossing;
According to described instantaneous voltage, calculate voltage effective value;
According to described current effective value and described voltage effective value, calculate the first applied power;
According to the time delay of voltage rising edge zero crossing and the time delay of electric current negative edge zero crossing, obtain the time between voltage rising edge zero crossing and electric current negative edge zero crossing;
According to the time between voltage rising edge zero crossing and electric current negative edge zero crossing, obtain voltage power factor and power flow direction;
According to described first applied power, 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.
As can be seen from the scheme of said system, by current sensing means and power adjustment apparatus are provided separately, connect to realize by wireless telecommunications the power calculation algorithms that voltage and current separates, thus realize regulating the bearing power of described photovoltaic generating system, and the power calculation algorithms that separates of voltage and current accurately can calculate the power of various distortion current, judge the flow direction of power, decrease the connection of current sensing means and power adjustment apparatus sampling circuit, install simple, the power calculation algorithms that separates of electric current and voltage in addition, interference between the power calculation of minimizing electric current and voltage, 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 process flow diagram of power regulating method first embodiment of photovoltaic generating system of the present invention;
Fig. 3 is the process flow diagram of power regulating method second embodiment of photovoltaic generating system of the present invention;
Fig. 4 is the process flow diagram of a kind of embodiment of electric current detecting method of the present invention;
Fig. 5 is the process flow diagram of a kind of embodiment of voltage power method of adjustment of the present invention.
Embodiment
In order to make technical matters solved by the invention, technical scheme and beneficial effect clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
The invention provides a kind of photovoltaic generating system 1 of embodiment, be connected with electrical network 3 by ammeter 2, as shown in Figure 1, described photovoltaic generating system 1 comprises: be arranged on the current sensing means 10 of consumer networks entrance and be arranged on the power adjustment apparatus 20 of load-side, described current sensing means 10 is connected by wireless telecommunications with power adjustment apparatus 20, that is in current sensing means 10, wireless transmitter module is set, wireless receiving module is provided with, to realize the wireless connections of current sensing means 10 and power adjustment apparatus 20 in power adjustment apparatus 20.Described photovoltaic generating system 1 also comprises solar panel 30, inverter 40, first load 50, second load 60 and the 3rd load 70, described 3rd load 70 is connected with the first end of described ammeter 2 by power adjustment apparatus 20, first load 50 is connected with the first end of described ammeter 2 respectively with the second load 60, second end of described ammeter 2 is connected with described electrical network 3, and described solar panel 30 is connected with described ammeter 2, power adjustment apparatus 20, current sensing means 10, first load 50 and the second load 60 respectively by inverter 40.
In concrete enforcement current sensing means 10 for:
Configuration Sampling interrupt, gathers electrical network entrance electric current, and storaging current instantaneous value;
According to described current instantaneous value, judge whether generation current negative edge zero crossing;
When generation current negative edge zero crossing, start timing, until when starting output current data, obtain the time delay of electric current negative edge zero crossing;
The virtual voltage instantaneous value synchronous with described current instantaneous value and virtual voltage amplitude is generated according to described current instantaneous value, and current effective value;
According to described current instantaneous value and the virtual instantaneous value of voltage, obtain electric current active power;
According to described current effective value and virtual voltage amplitude, obtain the second applied power;
According to electric current active power and the second applied power, obtain current power factor;
Export described current data to power adjustment apparatus 20, wherein said current data comprises the time delay of electric current negative edge zero crossing, current effective value and current power factor;
Power adjustment apparatus 20 is configured for:
Configuration current data receive interruption is to obtain described current data;
Configuration Sampling interrupt, gathers electrical network entrance potential, and storage voltage instantaneous value;
According to described instantaneous voltage, judge whether to produce voltage rising edge zero crossing;
When producing voltage rising edge zero crossing, starting timing, until receive described current data, obtaining the time delay of voltage rising edge zero crossing;
According to described instantaneous voltage, calculate voltage effective value;
According to described current effective value and described voltage effective value, calculate the first applied power;
According to the time delay of voltage rising edge zero crossing and the time delay of electric current negative edge zero crossing, obtain the time between voltage rising edge zero crossing and electric current negative edge zero crossing;
According to the time between voltage rising edge zero crossing and electric current negative edge zero crossing, obtain voltage power factor and power flow direction;
According to described first applied power, 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 1.
In concrete enforcement, power adjustment apparatus 20 also for:
Obtain from being sent to the communication delay time receiving described current data;
According to the time delay of described communication delay time, voltage rising edge zero crossing and the time delay of electric current negative edge zero crossing, obtain the time between voltage rising edge zero crossing and electric current negative edge zero crossing.
As can be seen from the scheme of said system, by current sensing means and power adjustment apparatus are provided separately, connect to realize by wireless telecommunications the power calculation algorithms that voltage and current separates, thus realize regulating the bearing power of described photovoltaic generating system, and the power calculation algorithms that voltage and current separates accurately can calculate the power of various distortion current, judge the flow direction of power, decrease the connection of current sensing means and power adjustment apparatus sampling circuit, install simple.In addition, the power calculation algorithms that electric current and voltage separates, the interference between the power calculation of minimizing electric current and voltage, improves the accuracy of power regulating method.
In concrete enforcement, Fig. 2 is the process flow diagram of power regulating method first embodiment of photovoltaic generating system of the present invention.As shown in Figure 2, the invention provides a kind of power regulating method of photovoltaic generating system of embodiment, described power regulating method comprises:
Step S10, configuration current data receive interruption is to obtain described current data, and wherein said current data comprises the time delay of electric current negative edge zero crossing, current effective value and current power factor;
Step S20, configuration Sampling interrupt, gathers electrical network entrance potential, and storage voltage instantaneous value, described instantaneous voltage is designated as u respectively
1, u
2..., u
n;
Step S30, according to described instantaneous voltage, judging whether to produce voltage rising edge zero crossing, when not producing pressure rising edge zero crossing, entering step S20, when generation voltage rising edge zero passage, enters step S40;
Step S40, when producing voltage rising edge zero crossing, starting timing, until receive described current data, obtaining the time delay of voltage rising edge zero crossing;
Step S50, according to described instantaneous voltage, calculates voltage effective value;
Step S60, according to described current effective value and described voltage effective value, calculates the first applied power;
Step S70, according to the time delay of voltage rising edge zero crossing and the time delay of electric current negative edge zero crossing, obtains the time between voltage rising edge zero crossing and electric current negative edge zero crossing;
Step S80, according to the time between voltage rising edge zero crossing and electric current negative edge zero crossing, obtains voltage power factor and power flow direction;
Step S90, according to described first applied power, voltage power factor and current power factor, obtain active power of output size;
Step S100, according to active power of output size and power flow direction, regulates the bearing power of described photovoltaic generating system.
In step slo, this receive data by wireless is configured to interruption form, in above-mentioned processing procedure, and this acceptance interruption of priority processing.This receive interruption is mainly used in described current data.
In step s 40, configuration first timer, produces the moment to T time delay receiving electric current negative edge over-current signal for recording voltage rising edge zero crossing
2, be namely mainly used in the time of calculating voltage rising edge zero passage and electric current negative edge zero passage.That is, after voltage rising edge zero cross signal being detected, reset first timer, then start timing, until stop timing when receiving described current data.
In step s 50, the computing formula obtaining voltage effective value Urms is as follows:
wherein, n is the number of the voltage instantaneous value sampled in the sampling period.
In step S60, the computing formula obtaining the first applied power S1 is as follows: S1=Irms
1* Urms.That is, the current effective value Irms of current sensing means transmission is received by wireless receiving module
1, then by current effective value Irms
1with voltage effective value Urms, calculate the first applied power S1.
In step S70, be specially: T=(T
2-T
1) %K, wherein, T is the time between voltage rising edge zero crossing and electric current negative edge zero crossing, T
2for the time delay of voltage rising edge zero crossing, T
1for the time delay of electric current negative edge zero crossing, K is the cycle of electrical network, and value is 20000us.That is, wireless receiving module receives electric current negative edge T time delay that current sensing means transmits
1, voltage rising edge zero crossing is to T time delay receiving electric current negative edge zero crossing
2, calculate the time T between voltage rising edge zero crossing and electric current negative edge zero crossing.
As can be seen from the scheme of said method, by the power calculation algorithms that electric current and voltage separates, accurately can calculate the power of various distortion current, judge the flow direction of power to decrease the connection of current sensing means and power adjustment apparatus sampling circuit, install simple.The power calculation algorithms that separates of electric current and voltage in addition, the interference between the power calculation reducing electric current and voltage, improves the accuracy of power regulating method.
In concrete enforcement, Fig. 3 is the process flow diagram of power regulating method second embodiment of photovoltaic generating system of the present invention.As shown in Figure 3, step S70 specifically comprises the following steps:
Step S71, obtains from being sent to the communication delay time T receiving described current data
3;
Step S72, according to the time delay of described communication delay time, voltage rising edge zero crossing and the time delay of electric current negative edge zero crossing, obtains the time between voltage rising edge zero crossing and electric current negative edge zero crossing.
In step S71, communication delay time T
3accept for current sensing means wireless communication module sends data and power adjustment apparatus the time delay that data cause, this time delay is relevant to the transmission speed of wireless communication module, can measure and obtain.Measure T
3, the result of calculation of power can be made more accurate.
In step S72, the computing formula of the time between voltage rising edge zero crossing and electric current negative edge zero crossing is: T=(T
2-T
3-T
1) %K; Wherein, T is the time between voltage rising edge zero crossing and electric current negative edge zero crossing, T
2for the time delay of voltage rising edge zero crossing, T
1for the time delay of electric current negative edge zero crossing, T
3for the communication delay time, K is the cycle of electrical network, and value is 20000us, and namely computing formula is: T=(T
2-T
3-T
1) %20000.
In concrete enforcement, step S80, specifically comprises:
Step S81, judges the time between voltage rising edge zero crossing and electric current negative edge zero crossing and the first predetermined period K1, the second predetermined period K2, and the relation between the 3rd predetermined period K3, obtains 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];
Work as K3<T<K2, voltage power factor=cos [(K2-T)/K*2*pi];
Step S82, judges the time between voltage rising edge zero crossing and electric current negative edge zero crossing and the relation between the first predetermined period K1 and the 3rd predetermined period K3, obtains power flow direction;
As K3<T<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 circular constant, and T is the time between voltage rising edge zero crossing and electric current negative edge zero crossing.
In step S82, current sensing means according to current Hall connection from electrical network power taking for just to connect.
When the first predetermined period K1 value is 15000us, second predetermined period K2 value is 10000us, during the 3rd predetermined period K3 value 5000us, determine the time T between voltage rising edge zero crossing and electric current negative edge zero crossing and the first predetermined period K1, second predetermined period K2, and the 3rd relation between predetermined period K3, obtain voltage power factor PF
2, concrete formula is as follows:
When T>=15000, PF
2=cos [(20000-T)/20000*2*pi]
As 10000≤T<15000, PF
2=cos [(15000-T)/20000*2*pi]
As 5000<T<10000, PF
2=cos [(10000-T)/20000*2*pi]
When T≤5000, PF
2=cos [T/20000*2*pi].
When the first predetermined period K1 value is 15000us, second predetermined period K2 value is 10000us, during the 3rd predetermined period K3 value 5000us, determine the time T between voltage rising edge zero crossing and electric current negative edge zero crossing and the first predetermined period K1, and the 3rd relation between predetermined period K3, obtain power flow direction, concrete formula is as follows:
As 5000<T<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 concrete enforcement, the invention provides the power regulating method of the photovoltaic generating system of the third embodiment, described photovoltaic generating system comprises the current sensing means being arranged on consumer networks entrance and the power adjustment apparatus being arranged on load-side, described current sensing means is connected by wireless telecommunications with power adjustment apparatus, and described power regulating method comprises: the voltage power method of adjustment of the electric current detecting method of a kind of embodiment as shown in Figure 4 and as shown in Figure 5 a kind of embodiment.As shown in Figure 4, electric current detecting method specifically comprises the following steps:
Step S101, current sensing means configuration Sampling interrupt, gathers electrical network entrance electric current, and storaging current instantaneous value, described current instantaneous value is designated as i respectively
1, i
2..., i
n;
Step S201, current sensing means, according to described current instantaneous value, judges whether generation current negative edge zero crossing, time if not, returns step S101, if so, enter step S301;
Step S301, current sensing means, when generation current negative edge zero crossing, starts timing, until during output current data, obtains the time delay of electric current negative edge zero crossing;
Step S401, current sensing means generates the virtual voltage instantaneous value synchronous with described current instantaneous value and virtual voltage amplitude according to described current instantaneous value, and current effective value;
Step S501, current sensing means, according to described current instantaneous value and the virtual instantaneous value of voltage, obtains electric current active power;
Step S601, current sensing means, according to described current effective value and virtual voltage amplitude, obtains the second applied power;
Step S701, current sensing means, according to electric current active power and the second applied power, obtains current power factor;
Step S801, current sensing means exports described current data to power adjustment apparatus, and wherein said current data comprises the time delay of electric current negative edge zero crossing, and current effective value and current power factor, enter step S110.
In step S301, configuration second timer, produce the moment to the time delay sent between data for record current decline zero crossing, it is mainly the time delay that data processing causes.That is, reset second timer after electric current negative edge zero cross signal being detected, then start timing, until stop timing when sending described current data.
In step S401, the virtual voltage signal with current synchronization, virtual voltage amplitude is V
1, this voltage signal also adopts discrete processes, and the sampling period is consistent with the current sample cycle, and is designated as v
1, v
2..., v
n.In addition, according to the current instantaneous value sampled in one-period, calculating current effective value Irms
1the computing formula of Urms is as follows:
wherein, n is the number of the electric current instant value sampled in the sampling period.
In step S501, described current instantaneous value and the virtual instantaneous value of voltage, calculate electric current active-power P
1:
In step s 601, current sensing means is according to described current effective value Irms
1with virtual voltage amplitude V
1, obtain the second applied power S2, computing formula is as follows: S2=Irms
1* V
1.
In step s 701, current sensing means is according to electric current active-power P
1with the second applied power S2, obtain current power factor PF
1, computing formula is as follows: PF
1=P
1/ S2.
As shown in Figure 5, the invention provides a kind of voltage power method of adjustment of photovoltaic generating system of embodiment, described voltage power method of adjustment comprises:
Step S110, power adjustment apparatus configuration current data receive interruption is to obtain described current data, and wherein said current data comprises the time delay of electric current negative edge zero crossing, current effective value and current power factor;
Step S120, power adjustment apparatus configuration Sampling interrupt, gathers electrical network entrance potential, and storage voltage instantaneous value, described instantaneous voltage is designated as u respectively
1, u
2..., u
n;
Step S130, power adjustment apparatus, according to described instantaneous voltage, judges whether to produce voltage rising edge zero crossing, when not producing pressure rising edge zero crossing, enters step S120, when generation voltage rising edge zero passage, enters step S40;
Step S140, power adjustment apparatus, when producing voltage rising edge zero crossing, starts timing, until receive described current data, obtains the time delay of voltage rising edge zero crossing;
Step S150, power adjustment apparatus, according to described instantaneous voltage, calculates voltage effective value;
Step S160, power adjustment apparatus, according to described current effective value and described voltage effective value, calculates
To the first applied power;
Step S170, power adjustment apparatus, according to the time delay of the time delay of voltage rising edge zero crossing and electric current negative edge zero crossing, obtains the time between voltage rising edge zero crossing and electric current negative edge zero crossing;
Step S180, power adjustment apparatus, according to the time between voltage rising edge zero crossing and electric current negative edge zero crossing, obtains voltage power factor and power flow direction;
Step S190, power adjustment apparatus is according to described first applied power, and voltage power factor and current power factor, obtain active power of output size;
Step S1100, power adjustment apparatus, according to active power of output size and power flow direction, regulates the bearing power of described photovoltaic generating system.
In step s 110, this receive data by wireless is configured to interruption form, in above-mentioned processing procedure, and this acceptance interruption of priority processing.This receive interruption is mainly used in described current data.
In step S140, power adjustment apparatus configuration first timer, produces the moment to T time delay receiving electric current negative edge over-current signal for recording voltage rising edge zero crossing
2, be namely mainly used in the time of calculating voltage rising edge zero passage and electric current negative edge zero passage.That is, after voltage rising edge zero cross signal being detected, reset first timer, then start timing, until stop timing when receiving described current data.
In step S150, the computing formula obtaining voltage effective value Urms is as follows:
wherein, n is the number of the voltage instantaneous value sampled in the sampling period.
In step S160, the computing formula obtaining the first applied power S1 is as follows: S1=Irms
1* Urms.That is, the current effective value Irms of current sensing means transmission is received by wireless receiving module
1, then by current effective value Irms
1with voltage effective value Urms, calculate the first applied power S1.
In step S170, be specially: T=(T
2-T
1) %K, wherein, T is the time between voltage rising edge zero crossing and electric current negative edge zero crossing, T
2for the time delay of voltage rising edge zero crossing, T
1for the time delay of electric current negative edge zero crossing, K is the cycle of electrical network, and value is 20000us.That is, wireless receiving module receives electric current negative edge T time delay that current sensing means transmits
1, voltage rising edge zero crossing is to T time delay receiving electric current negative edge zero crossing
2, calculate the time T between voltage rising edge zero crossing and electric current negative edge zero crossing.
As can be seen from the scheme of said method, by the power calculation algorithms that electric current and voltage separates, accurately can calculate the power of various distortion current, judge the flow direction of power, decrease the connection of current sensing means and power adjustment apparatus sampling circuit, install simple, the power calculation algorithms that separates of electric current and voltage in addition, the interference between the power calculation reducing electric current and voltage, improves the accuracy of power regulating method.
In concrete enforcement, step S170 specifically comprises the following steps:
Step S171, obtains from being sent to the communication delay time T receiving described current data
3;
Step S172, according to the time delay of described communication delay time, voltage rising edge zero crossing and the time delay of electric current negative edge zero crossing, obtains the time between voltage rising edge zero crossing and electric current negative edge zero crossing.
In step S171, communication delay time T
3accept for current sensing means wireless communication module sends data and power adjustment apparatus the time delay that data cause, this time delay is relevant to the transmission speed of wireless communication module, can measure and obtain.Measure T
3, the result of calculation of power can be made more accurate.
In step S172, the computing formula of the time between voltage rising edge zero crossing and electric current negative edge zero crossing is: T=(T
2-T
3-T
1) %K; Wherein, T is the time between voltage rising edge zero crossing and electric current negative edge zero crossing, T
2for the time delay of voltage rising edge zero crossing, T
1for the time delay of electric current negative edge zero crossing, T
3for the communication delay time, K is the cycle of electrical network, and value is 20000us, and namely computing formula is: T=(T
2-T
3-T
1) %20000.
In concrete enforcement, step S180, specifically comprises:
Step S81, judges the time between voltage rising edge zero crossing and electric current negative edge zero crossing and the first predetermined period K1, the second predetermined period K2, and the relation between the 3rd predetermined period K3, obtains 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];
Work as K3<T<K2, voltage power factor=cos [(K2-T)/K*2*pi];
Step S182, judges the time between voltage rising edge zero crossing and electric current negative edge zero crossing and the relation between the first predetermined period K1 and the 3rd predetermined period K3, obtains power flow direction;
As K3<T<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 circular constant, and T is the time between voltage rising edge zero crossing and electric current negative edge zero crossing.
In step S182, current sensing means according to current Hall connection from electrical network power taking for just to connect.
When the first predetermined period K1 value is 15000us, second predetermined period K2 value is 10000us, during the 3rd predetermined period K3 value 5000us, determine the time T between voltage rising edge zero crossing and electric current negative edge zero crossing and the first predetermined period K1, second predetermined period K2, and the 3rd relation between predetermined period K3, obtain voltage power factor PF
2, concrete formula is as follows:
When T>=15000, PF
2=cos [(20000-T)/20000*2*pi]
As 10000≤T<15000, PF
2=cos [(15000-T)/20000*2*pi]
As 5000<T<10000, PF
2=cos [(10000-T)/20000*2*pi]
When T≤5000, PF
2=cos [T/20000*2*pi].
When the first predetermined period K1 value is 15000us, second predetermined period K2 value is 10000us, during the 3rd predetermined period K3 value 5000us, determine the time T between voltage rising edge zero crossing and electric current negative edge zero crossing and the first predetermined period K1, and the 3rd relation between predetermined period K3, obtain power flow direction, concrete formula is as follows:
As 5000<T<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 preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a power regulating method for photovoltaic generating system, is characterized in that:
Configuration current data receive interruption is to obtain described current data, and wherein said current data comprises the time delay of electric current negative edge zero crossing, current effective value and current power factor;
Configuration Sampling interrupt, gathers electrical network entrance potential, and storage voltage instantaneous value;
According to described instantaneous voltage, judge whether to produce voltage rising edge zero crossing;
When producing voltage rising edge zero crossing, starting timing, until receive 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 applied power;
According to the time delay of voltage rising edge zero crossing and the time delay of electric current negative edge zero crossing, obtain the time between voltage rising edge zero crossing and electric current negative edge zero crossing;
According to the time between voltage rising edge zero crossing and electric current negative edge zero crossing, obtain voltage power factor and power flow direction;
According to described first applied power, 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.
2. power regulating method as claimed in claim 1, it is characterized in that: the time delay of the described time delay according to voltage rising edge zero crossing and electric current negative edge zero crossing, obtain the step of the time between voltage rising edge zero crossing and electric current negative edge zero crossing, specifically comprise the following steps:
Obtain from being sent to the communication delay time receiving described current data;
According to the time delay of described communication delay time, voltage rising edge zero crossing and the time delay of electric current negative edge zero crossing, obtain the time between voltage rising edge zero crossing and electric current negative edge zero crossing.
3. power regulating method as claimed in claim 2, it is characterized in that: the time delay of the described time delay according to described communication delay time, voltage rising edge zero crossing and electric current negative edge zero crossing, obtain the step of the time between voltage rising edge zero crossing and electric current negative edge zero crossing, be specially:
T＝(T
2-T
3-T
1)％K；
Wherein, T is the time between voltage rising edge zero crossing and electric current negative edge zero crossing, T
2for the time delay of voltage rising edge zero crossing, T
1for the time delay of electric current negative edge zero crossing, T
3for the communication delay time, K is the cycle of electrical network.
4. the power regulating method as described in claim 1-3 any one, is characterized in that: described according to the time between voltage rising edge zero crossing and electric current negative edge zero crossing, obtains voltage power factor and power flow direction, is specially:
Judge the time between voltage rising edge zero crossing and electric current negative edge zero crossing and the first predetermined period K1, the second predetermined period K2, and the relation between 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];
Work as K3<T<K2, voltage power factor=cos [(K2-T)/K*2*pi];
As T≤K3, voltage power factor=cos [T/K*2*pi];
Judge the time between voltage rising edge zero crossing and electric current negative edge zero crossing and the relation between the first predetermined period K1 and the 3rd predetermined period K3, obtain power flow direction;
As K3<T<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 circular constant, and T is the time between voltage rising edge zero crossing and electric current negative edge zero crossing.
5. the power regulating method of a photovoltaic generating system, it is characterized in that: described photovoltaic generating system comprises the current sensing means being arranged on consumer networks entrance and the power adjustment apparatus being arranged on load-side, described current sensing means is connected by wireless telecommunications with power adjustment apparatus, and described power regulating method comprises the following steps;
Current sensing means configuration Sampling interrupt, gathers electrical network entrance electric current, and storaging current instantaneous value;
Current sensing means, according to described current instantaneous value, judges whether generation current negative edge zero crossing;
Current sensing means, when generation current negative edge zero crossing, starts timing, until when starting output current data, obtain the time delay of electric current negative edge zero crossing;
Current sensing means generates the virtual voltage instantaneous value synchronous with described current instantaneous value and virtual voltage amplitude according to described current instantaneous value, and current effective value;
Current sensing means, according to described current instantaneous value and the virtual instantaneous value of voltage, obtains electric current active power;
Current sensing means, according to described current effective value and virtual voltage amplitude, obtains the second applied power;
Current sensing means, according to electric current active power and the second applied power, obtains current power factor;
Current sensing means exports described current data to power adjustment apparatus, and wherein said current data comprises the time delay of electric current negative edge zero crossing, current effective value and current power factor;
Power adjustment apparatus configuration current data receive interruption is to obtain described current data;
Power adjustment apparatus configuration Sampling interrupt, gathers electrical network entrance potential, and storage voltage instantaneous value;
Power adjustment apparatus, according to described instantaneous voltage, judges whether to produce voltage rising edge zero crossing;
Power adjustment apparatus, when producing voltage rising edge zero crossing, starts timing, until receive described current data, obtains the time delay of voltage rising edge zero crossing;
Power adjustment apparatus, according to described instantaneous voltage, calculates voltage effective value;
Power adjustment apparatus, according to described current effective value and described voltage effective value, calculates the first applied power;
Power adjustment apparatus, according to the time delay of the time delay of voltage rising edge zero crossing and electric current negative edge zero crossing, obtains the time between voltage rising edge zero crossing and electric current negative edge zero crossing;
Power adjustment apparatus, according to the time between voltage rising edge zero crossing and electric current negative edge zero crossing, obtains voltage power factor and power flow direction;
Power adjustment apparatus is according to described first applied power, and voltage power factor and current power factor, obtain active power of output size;
Power adjustment apparatus, according to active power of output size and power flow direction, regulates the bearing power of described photovoltaic generating system.
6. power regulating method as claimed in claim 5, it is characterized in that: described power adjustment apparatus is according to the time delay of the time delay of voltage rising edge zero crossing and electric current negative edge zero crossing, obtain the step of the time between voltage rising edge zero crossing and electric current negative edge zero crossing, specifically comprise the following steps:
Power adjustment apparatus obtains from being sent to the communication delay time receiving described current data;
Power adjustment apparatus, according to the time delay of the time delay of described communication delay time, voltage rising edge zero crossing and electric current negative edge zero crossing, obtains the time between voltage rising edge zero crossing and electric current negative edge zero crossing.
7. power regulating method as claimed in claim 6, it is characterized in that: described power adjustment apparatus is according to the time delay of the time delay of described communication delay time, voltage rising edge zero crossing and electric current negative edge zero crossing, obtain the step of the time between voltage rising edge zero crossing and electric current negative edge zero crossing, be specially:
T＝(T
2-T
3-T
1)％K；
Wherein, T is the time between voltage rising edge zero crossing and electric current negative edge zero crossing, T
2for the time delay of voltage rising edge zero crossing, T
1for the time delay of electric current negative edge zero crossing, T
3for the communication delay time, K is the cycle of electrical network.
8. the power regulating method as described in claim 5-7 any one, is characterized in that: described power adjustment apparatus, according to the time between voltage rising edge zero crossing and electric current negative edge zero crossing, obtains voltage power factor and power flow direction, is specially:
Power adjustment apparatus judges time between voltage rising edge zero crossing and electric current negative edge zero crossing and the first predetermined period K1, the second predetermined period K2, the relation between the 3rd predetermined period K3 and the 4th predetermined period K4;
As T >=K1, voltage power factor=cos [(K-T)/K*2*pi];
As K3≤T<K2, voltage power factor=cos [(K2-T)/K*2*pi];
Work as K4<T<K3, voltage power factor=cos [(K3-T)/K*2*pi];
As T≤K4, voltage power factor=cos [T/K*2*pi]; And
Power adjustment apparatus judges the time between voltage rising edge zero crossing and electric current negative edge zero crossing and the relation between the first predetermined period K1 and the 4th predetermined period K4;
As K4<T<K1, current direction is just, from electrical network power taking;
As T >=K1 or T≤K4, current direction is negative, current direction electrical network;
Wherein, T is the time between voltage rising edge zero crossing and electric current negative edge zero crossing.
9. a photovoltaic generating system, be connected with electrical network by ammeter, it is characterized in that: described photovoltaic generating system comprises the current sensing means being arranged on consumer networks entrance and the power adjustment apparatus being arranged on load-side, and described current sensing means is connected by wireless telecommunications with power adjustment apparatus;
Current sensing means is used for:
Configuration Sampling interrupt, gathers electrical network entrance electric current, and storaging current instantaneous value;
According to described current instantaneous value, judge whether generation current negative edge zero crossing;
When generation current negative edge zero crossing, start timing, until during output current data, obtain the time delay of electric current negative edge zero crossing;
The virtual voltage instantaneous value synchronous with described current instantaneous value and virtual voltage amplitude is generated according to described current instantaneous value, and current effective value;
According to described current instantaneous value and the virtual instantaneous value of voltage, obtain electric current active power;
According to described current effective value and virtual voltage amplitude, obtain the second applied power;
According to electric current active power and the second applied power, obtain current power factor;
Export described current data to power adjustment apparatus, wherein said current data comprises the time delay of electric current negative edge zero crossing, current effective value and current power factor;
Power adjustment apparatus is configured for:
Configuration current data receive interruption is to obtain described current data;
Configuration Sampling interrupt, gathers electrical network entrance potential, and storage voltage instantaneous value;
According to described instantaneous voltage, judge whether to produce voltage rising edge zero crossing;
When producing voltage rising edge zero crossing, starting timing, until receive described current data, obtaining the time delay of voltage rising edge zero crossing;
According to described instantaneous voltage, calculate voltage effective value;
According to described current effective value and described voltage effective value, calculate the first applied power;
According to the time delay of voltage rising edge zero crossing and the time delay of electric current negative edge zero crossing, obtain the time between voltage rising edge zero crossing and electric current negative edge zero crossing;
According to the time between voltage rising edge zero crossing and electric current negative edge zero crossing, obtain voltage power factor and power flow direction;
According to described first applied power, 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.
10. photovoltaic generating system as claimed in claim 9, is characterized in that: power adjustment apparatus also for:
Obtain from being sent to the communication delay time receiving described current data;
According to the time delay of described communication delay time, voltage rising edge zero crossing and the time delay of electric current negative edge zero crossing, obtain the time between voltage rising edge zero crossing and electric current negative edge zero crossing.
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| US20130054041A1 (en) * | 2007-08-06 | 2013-02-28 | Solaredge Technologies Ltd. | Digital Average Input Current Control in Power Converter |
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