CN101741134A - Direct-current common grid control device applied to photovoltaic power generation - Google Patents

Direct-current common grid control device applied to photovoltaic power generation Download PDF

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Publication number
CN101741134A
CN101741134A CN 200910220629 CN200910220629A CN101741134A CN 101741134 A CN101741134 A CN 101741134A CN 200910220629 CN200910220629 CN 200910220629 CN 200910220629 A CN200910220629 A CN 200910220629A CN 101741134 A CN101741134 A CN 101741134A
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CN
China
Prior art keywords
power
direct current
photovoltaic
voltage
electric power
Prior art date
Application number
CN 200910220629
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Chinese (zh)
Inventor
刘叶冰
邢岩
王欣
贾宁
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西东控制集团(沈阳)有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 西东控制集团(沈阳)有限公司 filed Critical 西东控制集团(沈阳)有限公司
Priority to CN 200910220629 priority Critical patent/CN101741134A/en
Publication of CN101741134A publication Critical patent/CN101741134A/en

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    • Y02B10/72
    • Y02E10/566

Abstract

The invention provides a control device for enabling photovoltaic electric power and commercial power direct current to be applied in a common grid, which comprises a current converging unit, a commercial power access unit and a control unit, wherein a microprocessor chip of the control unit adopts a C8051f020 chip. The control device has the advantages that: direct-current electric power generated by a photovoltaic system is connected with transformed and rectified commercial power of the same voltage class as that of the photovoltaic system to supply power to a direct-current electro-load common grid; and the photovoltaic electric power is used preferentially without storage batteries and the commercial power is used as stand-by power, so that the photovoltaic electric power is 'used immediately after being generated' and the photovoltaic electric power is furthest utilized and has the function of control protection.

Description

The direct current common network control device that a kind of photovoltaic generation is used

Technical field

The present invention relates to the photovoltaic generation application, particularly a kind of with the control device of civil power as power backup and the application of photovoltaic electric power common network.

Background technology

Current photovoltaic generation application development is very rapid, and present application system mode mainly contains from two kinds of net type and grid types; As if be divided into two kinds of DC application and AC applications again by its load form.

Mainly be made up of photovoltaic cell, controller, storage battery from net type application system, promptly daytime, photovoltaic generation electric power was by battery stores, night when electricity consumption (or need), by storage battery as the use that powers to the load of system's power backup.When load was AC load, this system also comprised inverter.

The grid type application system mainly is made up of photovoltaic cell, controller, combining inverter, and promptly photovoltaic generation is directly surfed the Net, and enters municipal electrical network unified allocation of resources and uses, and the large-sized photovoltaic power station all is this application forms at present.

Occur a kind of photovoltaic generation in addition at present again in the user side application mode that is incorporated into the power networks, promptly photovoltaic electric power is after inversion, and the running status of strict tracking civil power power distribution network adds at user's application side, powers to the load simultaneously with civil power.Be the municipal safe operation of electric network that guarantees to be incorporated into the power networks with it, require this system implementation strict protection to prevent that " island effect " takes place.

Summary of the invention

The purpose of this invention is to provide the direct current common network control device that a kind of photovoltaic generation is used, is a kind of control device that photovoltaic electric power and civil power direct current common network are used.

The technical scheme that adopts is:

The direct current common network control device that a kind of photovoltaic generation is used comprises the unit that confluxes, civil power access unit and control unit, and its structure chart as shown in Figure 1.

The unit that confluxes of the present invention; can insert the photovoltaic electric power of the direct voltage parameter unanimity on n road (n can equal 1); (standard is: 12VDC/24VDC/36VDC/48VDC/110VDC/220VDC/380VDC) to conflux to become the direct current power that can satisfy the DC load need for electricity by the protection diode; be electrically connected with city through the identical electric pressure of transformation rectification, to direct current with the power supply of electric loading common network.

Civil power access unit of the present invention is that the civil power transformation is rectified into and the corresponding to dc power supply of system's utilization voltage, is connected together with photovoltaic generation after confluxing and powers to DC load.

Control principle of the present invention is: after photovoltaic generation direct current power voltage is a little more than the civil power direct current power voltage that inserts, system will preferentially use photovoltaic electric power to power to DC load.Otherwise when photovoltaic electric power is not enough, when promptly direct current photovoltaic electric power voltage is a little less than the civil power direct voltage that inserts, system will select to be powered to DC load by civil power automatically.

Control unit of the present invention is at first monitored the voltage parameter of each road photovoltaic generation, notes abnormalities, and sends and turn-offs this road photovoltaic generation instruction, and implement to turn-off.Monitor the voltage parameter of civil power simultaneously, find fault and unusual, send the shutoff control command immediately, implement turn-off protection through the transformation rectification.

Control unit workflow of the present invention as shown in Figure 2.

Control unit of the present invention, core are microcontroller chips that can satisfy high-speed sampling, are made up of it and correspondent peripheral circuit and device, can carry out the high-speed sampling computing to each associated voltage monitoring parameter.Be example to select the C8051F020 chip for use as control unit acp chip of the present invention now, circuit theory diagrams as shown in Figure 3.

Apparatus of the present invention are a kind of with the power backup of municipal electric power as the photovoltaic applications system, realize that photovoltaic electric power is safely and reliably to the DC load power applications.Characteristics are that the realization photovoltaic electric power " is promptly sent out promptly and used ", and system need not storage battery, and there is not the possibility that reverse power takes place in system, and reduces system cost and maintenance cost greatly, and the secondary pollution of avoiding storage battery to cause.

Description of drawings

Fig. 1 is the structure chart of direct current common network control device.

Fig. 2 is a workflow diagram of the present invention.

Fig. 3 is a control unit circuit principle master drawing.

Embodiment

The direct current common network control device that a kind of photovoltaic generation is used is made up of the unit that confluxes, civil power access unit and control unit.Wherein the acp chip of control unit is selected C8051F020 for use, and workflow is carried out according to the following steps, as shown in Figure 2:

Step 1, receive voltage parameter, receive from the voltage parameter of civil power through the transformation rectification from n road (n can equal 1) photovoltaic electric power.

Step 2, compare with every normal value of former setting.

Step 3, note abnormalities.Corresponding monitoring circuit is sent the shutoff instruction.

Step 4, enforcement are turn-offed.Every monitoring is proceeded.

Step 5, after monitoring parameter is normal, time-delay fixed value (1s-60s) is sent and is opened this road instruction, and implements open-minded to this road.

Move in circles with this.

Claims (6)

1. the direct current common network control device used of a photovoltaic generation comprises the unit that confluxes, civil power access unit and control unit, this device and be applied as the DC load mains supply through the municipal electrical network common network of over commutation or transformation;
The described unit that confluxes, can insert the photovoltaic electric power of the direct voltage parameter unanimity on n road, conflux to become the direct current power that can satisfy the DC load need for electricity by the protection diode, be electrically connected with city through the identical electric pressure of transformation rectification, power with the electric loading common network to direct current, wherein n can equal 1;
Described civil power access unit is that the civil power transformation is rectified into and the corresponding to dc power supply of system's utilization voltage, is connected together with photovoltaic generation after confluxing and powers to DC load;
Described control unit, core are microcontroller chips that can satisfy high-speed sampling, are made up of it and correspondent peripheral circuit and device, can carry out the high-speed sampling computing to each associated voltage monitoring parameter;
At first monitor the voltage parameter of each road photovoltaic generation, note abnormalities, send and turn-off this road photovoltaic generation instruction, and implement to turn-off; Monitor the voltage parameter of civil power simultaneously, find fault and unusual, send the shutoff control command immediately, implement turn-off protection through the transformation rectification;
After photovoltaic generation direct current power voltage is a little more than the civil power direct current power voltage that inserts, system will preferentially use photovoltaic electric power to power to DC load; Otherwise when photovoltaic electric power is not enough, when promptly direct current photovoltaic electric power voltage is a little less than the civil power direct voltage that inserts, system will select to be powered to DC load by civil power automatically.
2. the direct current common network control device that a kind of photovoltaic generation according to claim 1 is used is characterized in that the civil power that photovoltaic electric power and rectification convert direct current to is connected jointly at control unit and powers to DC load.
3. the direct current common network control device that a kind of photovoltaic generation according to claim 2 is used, it is characterized in that when photovoltaic electric power voltage when converting the line voltage of direct current to, preferentially use photovoltaic electric power to power to DC load.
4. the direct current common network control device that a kind of photovoltaic generation according to claim 3 is used is characterized in that guaranteeing that promptly sending out promptly of photovoltaic electric power use.
5. the direct current common network control device that a kind of photovoltaic generation according to claim 4 is used; it is characterized in that having to photovoltaic electric power voltage and convert the line voltage monitoring function of direct current to, protection control occurs to implement when unusual civil power safety and electricity consumption payload security.
6. the direct current common network control device that a kind of photovoltaic generation according to claim 4 is used is characterized in that described microcontroller chip is the C8051F020 chip.
CN 200910220629 2009-12-10 2009-12-10 Direct-current common grid control device applied to photovoltaic power generation CN101741134A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN 200910220629 CN101741134A (en) 2009-12-10 2009-12-10 Direct-current common grid control device applied to photovoltaic power generation

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN 200910220629 CN101741134A (en) 2009-12-10 2009-12-10 Direct-current common grid control device applied to photovoltaic power generation

Publications (1)

Publication Number Publication Date
CN101741134A true CN101741134A (en) 2010-06-16

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CN (1) CN101741134A (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102751734A (en) * 2011-04-18 2012-10-24 周锡卫 Intelligent balanced power-supply system with multiple electric powers and multiple electric power storage, and method
CN102780221A (en) * 2012-07-20 2012-11-14 上海交通大学 System and method for controlling online type photovoltaic power generation microgrid without storage device
CN102882280A (en) * 2011-07-12 2013-01-16 上海诚控电子科技有限公司 Capacitor hybrid energy storage based efficient wind-solar-utility power complementary power supply device
CN102891464A (en) * 2012-10-15 2013-01-23 广州中晶新能源工程有限公司 Photovoltaic string protection device
CN103036260A (en) * 2011-09-29 2013-04-10 京畿股份有限公司 Direct current power supply system with renewable energy and mains supply mutually redundant
CN104221243A (en) * 2012-03-01 2014-12-17 西斯维尔科技有限公司 Method and apparatus for managing electric energy produced locally for self-consumption and distributed to multiple users belonging to one or more communities of users
CN105098952A (en) * 2015-08-27 2015-11-25 湖北工业大学 Controller for cooperative work of household solar micro grid and municipal power

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102751734A (en) * 2011-04-18 2012-10-24 周锡卫 Intelligent balanced power-supply system with multiple electric powers and multiple electric power storage, and method
CN102751734B (en) * 2011-04-18 2014-12-10 周锡卫 Intelligent balanced power-supply system with multiple electric powers and multiple electric power storage
CN102882280A (en) * 2011-07-12 2013-01-16 上海诚控电子科技有限公司 Capacitor hybrid energy storage based efficient wind-solar-utility power complementary power supply device
CN103036260A (en) * 2011-09-29 2013-04-10 京畿股份有限公司 Direct current power supply system with renewable energy and mains supply mutually redundant
CN104221243A (en) * 2012-03-01 2014-12-17 西斯维尔科技有限公司 Method and apparatus for managing electric energy produced locally for self-consumption and distributed to multiple users belonging to one or more communities of users
CN104221243B (en) * 2012-03-01 2018-01-19 西斯维尔科技有限公司 For managing as the method and apparatus of the electric energy that is locally generated and being distributed to the multiple users for belonging to one or more communities of users from consumption
CN102780221B (en) * 2012-07-20 2014-08-27 上海交通大学 System and method for controlling online type photovoltaic power generation microgrid without storage device
CN102780221A (en) * 2012-07-20 2012-11-14 上海交通大学 System and method for controlling online type photovoltaic power generation microgrid without storage device
CN102891464A (en) * 2012-10-15 2013-01-23 广州中晶新能源工程有限公司 Photovoltaic string protection device
CN105098952A (en) * 2015-08-27 2015-11-25 湖北工业大学 Controller for cooperative work of household solar micro grid and municipal power

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Application publication date: 20100616