CN101958555A - Intelligent control system and method of photovoltaic grid-connected power station - Google Patents
Intelligent control system and method of photovoltaic grid-connected power station Download PDFInfo
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- CN101958555A CN101958555A CN2010102687265A CN201010268726A CN101958555A CN 101958555 A CN101958555 A CN 101958555A CN 2010102687265 A CN2010102687265 A CN 2010102687265A CN 201010268726 A CN201010268726 A CN 201010268726A CN 101958555 A CN101958555 A CN 101958555A
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The invention relates to an intelligent control system and a method of a photovoltaic grid-connected power station, the system comprises a plurality of groups of photovoltaic arrays, an inverter and a load, wherein the plurality of the groups of the photovoltaic arrays are connected with the input side of the inverter; the system is characterized by further comprising a first current transformer, the primary side is connected with the output side of the inverter, and the secondary side is connected with the input end of a first current transducer; the output end of the first current transducer is connected with a central controller PLC; the system further comprises a second current transformer, the primary side is connected with the total input side of the load, and the secondary side is connected with the input end of a second current transducer; the output end of the second current transducer is connected with the central controller PLC; the system also comprises a plurality of direct current contactors which correspond to the photovoltaic arrays in a one-to-one manner; and the input end of the each direct current contactor is corresponding connected with the control signal output end of the central controller PLC through a control device, and the output end of each direct current contactor is connected between the corresponding photovoltaic array and the input side of the inverter. The system and the method can realize the detection and the real-time control of photovoltaic power generation and prevent the counterflow of electrical quantity to an alternating current power grid under the premise of leading the power generation to meet the use of the load.
Description
Technical field
The present invention relates to the photovoltaic plant technical field, specifically is a kind of pv grid-connected plant intelligence control system and method.
Background technology
Traditional fuel energy reduces day by day, and the harm that environment is caused also becomes increasingly conspicuous, and in order to keep long-range sustainable development, solar energy more and more comes into one's own as a kind of inexhaustible and free of contamination energy.Solar energy more and more is applied in life, industrial production, and photovoltaic generation is exactly wherein one.In field of photovoltaic power generation, there are two kinds of forms in the power station: a kind of is from net, i.e. solar panel power supply accumulators is then by the storage battery supply load; Also having a kind of is to be incorporated into the power networks, and is that photovoltaic generation and AC network are combined into load electric power is provided.And pv grid-connected plant is more and more at present, in order to realize that solar power system combines with intelligence between AC network, when making full use of solar power generation, prevent that adverse current from producing impact to AC network, electrical network not being had a negative impact becomes the technical problem that need overcome.
Summary of the invention
In order to overcome the shortcoming that above-mentioned prior art exists, the object of the present invention is to provide a kind of pv grid-connected plant intelligence control system and method, it can prevent effectively that adverse current from producing impact to AC network.
For addressing the above problem, the present invention by the following technical solutions:
This pv grid-connected plant intelligence control system comprises many group photovoltaic arrays, inverter, load, organizes photovoltaic array more and is connected with the input side of described inverter, and the outlet side of inverter is connected with AC network;
Also comprise first current transformer, the primary side of described first current transformer is connected with the outlet side of described inverter, and secondary side connects the input of first current transducer; The output of described first current transducer connects first input end of analog signal of central controller PLC;
Also comprise second current transformer, the primary side of second current transformer connects total input side of load, and secondary side connects the input of second current transducer; The output of described second current transducer connects second input end of analog signal of described central controller PLC;
Also comprise a plurality of D.C. contactors, corresponding one by one with described photovoltaic array, the input of D.C. contactor is by the corresponding connection with the control signal output ends of described central controller PLC of control device, and the output of D.C. contactor is connected between the input side of corresponding photovoltaic array and described inverter.
The pv grid-connected plant intelligence control method may further comprise the steps:
1), utilize first current transformer to detect the outlet side electric current of inverter, and after first current transducer is converted into first analog signal, deliver to first input end of analog signal of central controller PLC;
Utilize second current transformer to detect the total input side electric current of load, and after second current transducer is converted into second analog signal, deliver to second input end of analog signal of described central controller PLC;
2), central controller PLC handles first analog signal, second analog signal that receive, and judge relatively more corresponding photovoltaic generation amount with first analog signal, with the magnitude relationship of the corresponding load power consumption of second analog signal;
3), central controller PLC is according to the judged result of the magnitude relationship of described photovoltaic generation amount, load power consumption, output is to the control signal of described D.C. contactor;
If when judging the photovoltaic generation amount less than the load power consumption, central controller PLC controls all D.C. contactor closures, starts all photovoltaic arrays;
If when judging the photovoltaic generation amount greater than the load power consumption, central controller PLC controls one or more D.C. contactors and opens according to the size output control signal of difference, closes one or more groups photovoltaic array.
The invention has the beneficial effects as follows: can realize the detection of photovoltaic generation amount and control in real time, satisfy under the prerequisite that load uses in generating and to prevent the electric weight adverse current to the situation that exchanges electrical network, solve the problem that exists when combining between photovoltaic generation and the AC network, for the application of photovoltaic generation provides convenience, photovoltaic generation universal played great facilitation.
Description of drawings
The present invention is described further below in conjunction with drawings and Examples:
Fig. 1 is the circuit theory diagrams of pv grid-connected plant control system in the embodiment of the invention,
Fig. 2 is the schematic block circuit diagram of pv grid-connected plant control system in the embodiment of the invention,
Fig. 3 is the flow chart of pv grid-connected plant control method in the embodiment of the invention;
Among the figure: 1 photovoltaic array, 2 inverters, 3 first current transducers, 4 central controller PLC, 5 loads, 6 second current transducers, 7 AC network, 8 D.C. contactors, 9 control device.
Embodiment
As shown in Figure 1, 2, this pv grid-connected plant intelligence control system comprises many group photovoltaic arrays 1, inverter 2, load 5, organizes photovoltaic array 1 more and is connected with the input side of described inverter 2, and the outlet side of inverter 2 is connected with AC network 7; Also comprise the first current transformer TA1, first current transducer 3, central controller PLC 4, the second current transformer TA2, second current transducer 6 and a plurality of D.C. contactor 8.
The primary side of the first current transformer TA1 is connected with the outlet side of described inverter 2, and secondary side connects the input of first current transducer 3; The output of described first current transducer 3 connects first input end of analog signal of central controller PLC 4.
The primary side of the second current transformer TA2 connects total input side of load 5, and secondary side connects the input of second current transducer 6; The output of described second current transducer 6 connects second input end of analog signal of described central controller PLC 4.
Each D.C. contactor 8 is corresponding one by one with every group of photovoltaic array 1, the input of D.C. contactor 8 is by the corresponding connection with the control signal output ends of described central controller PLC 4 of control device 9, and the output of D.C. contactor 8 is connected between the input side of corresponding photovoltaic array and described inverter 2.
As shown in Figure 3, this pv grid-connected plant intelligence control method may further comprise the steps:
1), utilize the first current transformer TA1 to detect the outlet side electric current of inverter 2, and be converted into first input end of analog signal of delivering to central controller PLC 4 after first analog signal of 4-20mA through first current transducer 3;
Utilize the second current transformer TA2 to detect load 5 total input side electric currents, and be converted into second input end of analog signal of delivering to described central controller PLC 4 after second analog signal of 4-20mA through second current transducer 6;
2), 4 couples of central controller PLC first analog signal, second analog signal that receive handle, and judge relatively more corresponding photovoltaic generation amount with first analog signal, with the magnitude relationship of the corresponding load power consumption of second analog signal;
3), central controller PLC 4 is according to the judged result of the magnitude relationship of described photovoltaic generation amount, load power consumption, output is to the control signal of described D.C. contactor;
If when judging the photovoltaic generation amount less than the load power consumption, central controller PLC controls all D.C. contactor closures, starts all photovoltaic arrays;
If when judging the photovoltaic generation amount greater than the load power consumption, central controller PLC controls one or more D.C. contactors and opens according to the size output control signal of difference, closes one or more groups photovoltaic array.For example: when the photovoltaic generation amount surpass the load power consumption 105% the time, open a D.C. contactor, close one group of photovoltaic array to reduce the solar power generation amount; And the like.Central controller PLC according to the size of described difference, adjusts the quantity of opening D.C. contactor in real time, promptly adjusts the group number of closing photovoltaic array.
Like this in pv grid-connected plant work:
When photovoltaic array does not generate electricity, power to the load by AC network;
The electric weight that sends when photovoltaic array does not satisfy load when using, and provides required electric weight to load jointly by photovoltaic array and AC network;
When the electric weight that sends when photovoltaic array surpasses the use amount of load, can cut off single output of organizing or organizing photovoltaic array more by force as required, to reduce the output electric weight of photovoltaic generating system, make it to be complementary with the power consumption of load, prevent the photovoltaic generation surplus and adverse current to the situation that exchanges electrical network.
Claims (2)
1. the pv grid-connected plant intelligence control system comprises many group photovoltaic arrays, inverter, load, organizes photovoltaic array more and is connected with the input side of described inverter, and the outlet side of inverter is connected with AC network; It is characterized in that:
Also comprise first current transformer, the primary side of described first current transformer is connected with the outlet side of described inverter, and secondary side connects the input of first current transducer; The output of described first current transducer connects first input end of analog signal of central controller PLC;
Also comprise second current transformer, the primary side of second current transformer connects total input side of load, and secondary side connects the input of second current transducer; The output of described second current transducer connects second input end of analog signal of described central controller PLC;
Also comprise a plurality of D.C. contactors, corresponding one by one with described photovoltaic array, the input of D.C. contactor is by the corresponding connection with the control signal output ends of described central controller PLC of control device, and the output of D.C. contactor is connected between the input side of corresponding photovoltaic array and described inverter.
2. the pv grid-connected plant intelligence control method is characterized in that, may further comprise the steps:
1), utilize first current transformer to detect the outlet side electric current of inverter, and after first current transducer is converted into first analog signal, deliver to first input end of analog signal of central controller PLC;
Utilize second current transformer to detect the total input side electric current of load, and after second current transducer is converted into second analog signal, deliver to second input end of analog signal of described central controller PLC;
2), central controller PLC handles first analog signal, second analog signal that receive, and judge relatively more corresponding photovoltaic generation amount with first analog signal, with the magnitude relationship of the corresponding load power consumption of second analog signal;
3), central controller PLC is according to the judged result of the magnitude relationship of described photovoltaic generation amount, load power consumption, output is to the control signal of described D.C. contactor;
If when judging the photovoltaic generation amount less than the load power consumption, central controller PLC controls all D.C. contactor closures, starts all photovoltaic arrays;
If when judging the photovoltaic generation amount greater than the load power consumption, central controller PLC controls one or more D.C. contactors and opens according to the size output control signal of difference, closes one or more groups photovoltaic array.
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102386810A (en) * | 2011-11-28 | 2012-03-21 | 山东力诺太阳能电力工程有限公司 | Data real-time acquiring and monitoring system in photovoltaic power supply system |
| CN102832637A (en) * | 2012-08-23 | 2012-12-19 | 许继集团有限公司 | Reverse current preventing method for photovoltaic power station |
| CN102882254A (en) * | 2012-09-25 | 2013-01-16 | 合肥国润智能电气技术有限公司 | Zero-loss photovoltaic follower |
| CN103138282A (en) * | 2011-11-24 | 2013-06-05 | 苏州欧姆尼克新能源科技有限公司 | Reverse power protection system of photovoltaic grid-connected inverter |
| CN103178545A (en) * | 2013-03-26 | 2013-06-26 | 西安理工大学 | Power grid current harmonic complementary circuit and control method for photovoltaic grid-connected inverter |
| CN104300896A (en) * | 2014-11-18 | 2015-01-21 | 厦门科华恒盛股份有限公司 | Photovoltaic inverter control device with backflow preventing function and control method thereof |
| CN104319810A (en) * | 2014-10-31 | 2015-01-28 | 广东易事特电源股份有限公司 | Input safety protection circuit of photovoltaic inverter and photovoltaic inverter having safety protection function |
| CN105187004A (en) * | 2015-09-23 | 2015-12-23 | 常熟市宏宇水电设备工程有限责任公司 | Photovoltaic power generation reverse current protection device |
| CN106372396A (en) * | 2016-08-28 | 2017-02-01 | 刘建林 | Solar hot water supply method and system |
| CN107069798A (en) * | 2017-01-17 | 2017-08-18 | 陕西科技大学 | The control method and its system of distributed photovoltaic power generation system |
| WO2018039823A1 (en) * | 2016-08-28 | 2018-03-08 | 刘建林 | Method and system for dynamically controlling solar cell according to load |
| WO2018039825A1 (en) * | 2016-08-28 | 2018-03-08 | 刘建林 | Solar hot water supply method and system |
| CN108540085A (en) * | 2012-06-04 | 2018-09-14 | 太阳能安吉科技有限公司 | Integrated photovoltaic panel circuit |
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Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103138282A (en) * | 2011-11-24 | 2013-06-05 | 苏州欧姆尼克新能源科技有限公司 | Reverse power protection system of photovoltaic grid-connected inverter |
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| CN102882254A (en) * | 2012-09-25 | 2013-01-16 | 合肥国润智能电气技术有限公司 | Zero-loss photovoltaic follower |
| CN103178545A (en) * | 2013-03-26 | 2013-06-26 | 西安理工大学 | Power grid current harmonic complementary circuit and control method for photovoltaic grid-connected inverter |
| CN103178545B (en) * | 2013-03-26 | 2014-11-05 | 西安理工大学 | Power grid current harmonic complementary circuit and control method for photovoltaic grid-connected inverter |
| CN104319810A (en) * | 2014-10-31 | 2015-01-28 | 广东易事特电源股份有限公司 | Input safety protection circuit of photovoltaic inverter and photovoltaic inverter having safety protection function |
| CN104300896A (en) * | 2014-11-18 | 2015-01-21 | 厦门科华恒盛股份有限公司 | Photovoltaic inverter control device with backflow preventing function and control method thereof |
| CN105187004B (en) * | 2015-09-23 | 2017-11-21 | 常熟市宏宇电力工程有限公司 | A kind of photovoltaic generation counter current protection |
| CN105187004A (en) * | 2015-09-23 | 2015-12-23 | 常熟市宏宇水电设备工程有限责任公司 | Photovoltaic power generation reverse current protection device |
| WO2018039823A1 (en) * | 2016-08-28 | 2018-03-08 | 刘建林 | Method and system for dynamically controlling solar cell according to load |
| WO2018039825A1 (en) * | 2016-08-28 | 2018-03-08 | 刘建林 | Solar hot water supply method and system |
| CN106372396A (en) * | 2016-08-28 | 2017-02-01 | 刘建林 | Solar hot water supply method and system |
| CN107069798A (en) * | 2017-01-17 | 2017-08-18 | 陕西科技大学 | The control method and its system of distributed photovoltaic power generation system |
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