CN103280795A - Direct-current bus photoelectric real-time convergence system and control method - Google Patents
Direct-current bus photoelectric real-time convergence system and control method Download PDFInfo
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- CN103280795A CN103280795A CN2013101543250A CN201310154325A CN103280795A CN 103280795 A CN103280795 A CN 103280795A CN 2013101543250 A CN2013101543250 A CN 2013101543250A CN 201310154325 A CN201310154325 A CN 201310154325A CN 103280795 A CN103280795 A CN 103280795A
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Abstract
The invention relates to a direct-current bus photoelectric real-time convergence system and a control method, and belongs to the field of a distribution type photoelectric direct-current micro-grid power supply. The direct-current bus photoelectric real-time convergence system comprises a direct-current input source; the direct-current input source is connected with a unidirectional rectification controller; and an output end of the unidirectional rectification controller is connected with a bus capacitor pack. An input end of the bus capacitor pack is connected with a DC/DC (Direct-Current/Direct-Current) converter; and the DC/DC converter is used for realizing the adjustment of output power of a photovoltaic cell panel. The two ends of the bus capacitor pack are connected with a discharging circuit in parallel; and meanwhile, an output end of the bus capacitor pack is connected with a direct-current load. A working manner of the system is determined through multi-stage hysteresis control of the bus capacitor pack, so that direct-current stable-voltage output is realized and the load power supply is guaranteed to be normal; under the precondition of guaranteeing that the output voltage is stable, the photovoltaic cell panel is used as an auxiliary energy source to realize real-time convergence of photovoltaic energy and the direct-current input source, so that the energy utilization rate is improved, the power generation cost is reduced and the environmental pollution is reduced; and the direct-current bus photoelectric real-time convergence system and the control method disclosed by the invention have very good universality and practical values.
Description
Technical field
The present invention relates to a kind of dc bus photoelectricity conflux in real time system and control method.Belong to distributed photovoltaic direct current microgrid field of power supplies, relate in particular to a kind of dc bus photoelectricity conflux in real time system and control method.
Background technology
Distributed photovoltaic direct current microgrid power-supply system, guaranteeing the down stable of output voltage, can realize that with being flowed on the dc bus of distributed power source harmony be that load is powered together, the while can also be realized the management of self system, when guarantee was cut off the power supply in DC power supply, distribution power was not to its reverse power supply.
At present, based on the microgrid power-supply system of dc bus, mainly adopt the power supply form of a plurality of equipment centralized dispatching formulas, complex structure especially in the face of on the commercial market of middle low power grade, is unfavorable for the large tracts of land popularization; And mostly existing photovoltaic complementary power supply is that the energy that photovoltaic battery panel is sent is main, and other power supplys are the mode of assisting, and because of the discontinuity of photo-voltaic power supply, it is unfavorable that difficult the stable of output busbar voltage of keeping, powering load have brought.
Summary of the invention
The objective of the invention is the characteristics at the microgrid power-supply system of dc bus, a kind of multistage stagnant ring control method of voltage of utilizing the bus capacitor group is provided, determine the working method of system, can be in parallel, expandable type dc bus photoelectricity conflux in real time system and control method.
In order to achieve the above object, technical scheme of the present invention provides a kind of dc bus photoelectricity conflux in real time system and control method, it is characterized in that: comprise the direct current input source, the direct current input source links to each other with unidirectional commutation controller, and the output of unidirectional commutation controller links to each other with the bus capacitor group.The input of bus capacitor group links to each other with the DC/DC converter, and the DC/DC converter is used for realization to the adjusting of the power output of photovoltaic battery panel.The two ends of bus capacitor group and discharge circuit parallel connection, the output of bus capacitor group links to each other with DC load simultaneously.By to the multistage stagnant ring control of the voltage of bus capacitor group, determine the working method of system, thereby realize DC voltage-stabilizing output that the proof load power supply is normal.
The dc bus photoelectricity provided by the present invention system of confluxing in real time adopts the multistage stagnant ring control method of voltage of bus capacitor group, busbar voltage is divided into output voltage crosses low Vref_L, the higher Vref_M of output voltage, the too high Vref_H Three Estate of output voltage.When busbar voltage was lower than Vref_L, system was in the mode of closing; When busbar voltage worked in [Vref_L, Vref_M], the DC/DC converter was in the MPPT maximum power point tracking working method; Greater than Vref_M during less than Vref_H, the DC/DC converter is in contrary MPPT maximum power point tracking working method in busbar voltage; When busbar voltage was higher than Vref_H, the DC/DC converter was in contrary MPPT maximum power point tracking and discharge circuit is in the repid discharge working method.
Beneficial effect of the present invention has:
1, adopts the multistage stagnant ring control mode of busbar voltage, prolong the maximum power output time of photovoltaic battery panel, take full advantage of photovoltaic energy, guarantee the stable of system's output voltage, lower the load power consumption.
2, system configuration is simple, need not storage battery as energy storage device, reduces system cost, reduces environmental pollution.
3, when DC power supply is cut off the power supply, distribution power ensures the safety of DC source not to its reverse power supply.
4, system is plug and play type, and is easy to use, universal strong.
Description of drawings
Fig. 1 is the dc bus photoelectricity provided by the invention system architecture diagram that confluxes in real time;
Fig. 2 is conflux the in real time control flow chart of system of dc bus photoelectricity provided by the invention;
Fig. 3 the invention provides conflux the in real time physical circuit figure of system of a kind of dc bus photoelectricity;
Fig. 4 is the another kind of physical circuit figure that the invention provides a kind of DC/DC converter;
Embodiment
For the present invention is become apparent, now with a preferred embodiment, and conjunction with figs. is described below in detail.
The present invention is directed to the power reguirements of the microgrid power supply of dc bus, designed a kind of with photovoltaic battery panel as supplementary energy, the dc bus photoelectricity that confluxes in real time of realizing photovoltaic energy and direct current input source conflux in real time system and control method.This circuit structure comprises the direct current input source as shown in Figure 1, and the direct current input source links to each other with unidirectional commutation controller, and the output of unidirectional commutation controller links to each other with the bus capacitor group.The input of bus capacitor group links to each other with the DC/DC converter, and the DC/DC converter is used for realization to the adjusting of the power output of photovoltaic battery panel.The two ends of bus capacitor group and discharge circuit parallel connection, the output of bus capacitor group links to each other with DC load simultaneously.By to the multistage stagnant ring control of the voltage of bus capacitor group, determine the working method of system, thereby realize DC voltage-stabilizing output that the proof load power supply is normal.
Fig. 2 is conflux the in real time control flow chart of system of dc bus photoelectricity, adopts the multistage stagnant ring control method of voltage of bus capacitor group, busbar voltage is divided into output voltage crosses low Vref_L, the higher Vref_M of output voltage, the too high Vref_H Three Estate of output voltage.When busbar voltage is lower than Vref_L, show system's overload, need shutdown system protection power safety; When busbar voltage worked in [Vref_L, Vref_M], the DC/DC converter was in the MPPT maximum power point tracking working method, and photovoltaic battery panel to bussed supply, reduces the load electricity consumption with maximum power; In busbar voltage during greater than Vref_M and less than Vref_H, the DC/DC converter is in contrary MPPT maximum power point tracking working method, by output reference current Ipvref(or the increase output reference voltage Vpvref that reduces photovoltaic battery panel), the energy that reduces bus capacitor injects, and reduces busbar voltage; Show that when busbar voltage is higher than Vref_H photovoltaic battery panel is powered too much at short notice, the DC/DC converter is in contrary MPPT maximum power point tracking and discharge circuit is in the repid discharge working method, rapidly busbar voltage is pulled down in the given range.
Fig. 3 is conflux the in real time physical circuit figure of system of a kind of dc bus photoelectricity.This circuit comprises direct voltage output 101, photovoltaic battery panel 102 and DC load 301; Unidirectional commutation controller 201 is made up of first relay K, 1, the first diode D1; Bus capacitor group 203 comprises the second bus capacitor C2, triple bus-bar capacitor C 3, the four bus capacitor C4, the 5th bus capacitor C5; Discharge circuit 204 is by the first discharge resistance R1, and the first power tube Q1 and second relay K 2 are formed; First inductance L 1, the second metal-oxide-semiconductor Q2 and the second diode D2 form DC/DC converter 202.After system's unlatching work, by judging the voltage of bus capacitor group 203, determine the working method of system, that realizes photovoltaic and DC power supply confluxes the proof load stable power-supplying in real time.When the voltage of bus capacitor group 203 is lower than Vref_L, show system overload or outage, come switching off load by block system relay K1 and K2.When busbar voltage worked in [Vref_L, Vref_M], DC/DC converter 202 was in the MPPT maximum power point tracking working method, photovoltaic battery panel 102 with maximum power to bussed supply.Continuous injection with this photovoltaic energy, the voltage of bus capacitor group 203 can raise thereupon among a small circle, when busbar voltage is higher than the tube voltage drop VD sum of direct current output source 101 and the first diode D1, because of the unidirectional conduction of the first diode D1, the output current of direct current output source 101 can be reduced to zero thereupon.Thereby realize confluxing in real time of photovoltaic energy and DC power supply energy, reduce the load amount of power supply.When the voltage of bus capacitor group 203 is positioned at [Vref_M, Vref_H] time, show that busbar voltage is higher, photovoltaic output energy is more than needed, output duty cycle by control DC/DC converter 202, reduce the output reference current Ipvref of photovoltaic battery panel 102, thereby the energy that reduces bus capacitor injects, and reduces busbar voltage.When being higher than Vref_H, the voltage of bus capacitor group 203 shows, photovoltaic battery panel is powered too much at short notice, at this moment, in order to reduce busbar voltage rapidly, when removing the output reference current Ipvref that passes through DC/DC converter 202 reduction photovoltaic battery panels 102, open discharge circuit 204, increase the rapidity of load raising system, thereby busbar voltage was pulled down in the given range in moment, guarantees output voltage stabilization.
When adopting Fig. 3 circuit structure, when busbar voltage works in [Vref_L, Vref_M] time, DC/DC converter 202 is in the MPPT maximum power point tracking working method, for reducing the ripple coefficient of input capacitance, this MPPT maximum power point tracking algorithm adopts current type disturbance observation, by the output reference current Ipvref realization MPPT maximum power point tracking control of control photovoltaic battery panel 102.
Fig. 4 is a kind of another kind of physical circuit figure of DC/DC converter.This circuit comprises the 3rd diode D3, the 4th diode D4, the 11 capacitor C 11, the 12 capacitor C 12, the 13 capacitor C 13, the four metal-oxide-semiconductors and second inductance L 2.The 3rd diode D3 input links to each other with photovoltaic battery panel 102, output and the 11 capacitor C 11, the 12 capacitor C 12, the 13 capacitor C 13 link to each other, when photovoltaic battery panel 102 output voltages were zero, the 3rd diode D3 played and prevents that busbar voltage is counter and be poured on the photovoltaic battery panel 102.When busbar voltage worked in [Vref_L, Vref_M], DC/DC converter 202 was in the MPPT maximum power point tracking working method, reduced the burden of controller in order to reduce the cost, and adopted climbing method to realize MPPT maximum power point tracking.When the voltage of bus capacitor group 203 was positioned at [Vref_M, Vref_H], the output duty cycle by control control DC/DC converter 202 reduced the power output of photovoltaic battery panel 102, thereby the energy that reduces bus capacitor injects, and reduces busbar voltage.When the voltage of bus capacitor group 203 is higher than Vref_H, photovoltaic battery panel 102 is powered too much at short notice, at this moment, in order to reduce busbar voltage rapidly, DC/DC converter 202 reduces duty ratio fast, reduces the power output of photovoltaic battery panel 102, open discharge circuit 204 simultaneously, increase the rapidity that load improves system, thereby busbar voltage was pulled down in the given range in moment, guarantee output voltage stabilization.
The above only is preferred embodiments of the present invention, not in order to limiting the present invention, all any modifications of doing in the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (2)
1. conflux in real time system and control method of a dc bus photoelectricity, it is characterized in that: comprise direct current input source (101), direct current input source (101) links to each other (201) with unidirectional commutation controller, and the output of unidirectional commutation controller (201) links to each other with bus capacitor group (203).The input of bus capacitor group (203) links to each other with DC/DC converter (202), and DC/DC converter (202) is used for realization to the adjusting of the power output of photovoltaic battery panel (101).The two ends of bus capacitor group (203) and discharge circuit (204) parallel connection, the output of bus capacitor group (203) links to each other with DC load (301) simultaneously.By to the multistage stagnant ring control of the voltage of bus capacitor group (203), determine the working method of system, thereby realize DC voltage-stabilizing output that the proof load power supply is normal.
2. conflux in real time system and control method of a kind of dc bus photoelectricity as claimed in claim 1, it is characterized in that: the multistage stagnant ring control of the voltage of described bus capacitor group (203), be busbar voltage to be divided into output voltage cross low Vref_L, the higher Vref_M of output voltage, the too high Vref_H Three Estate of output voltage.When busbar voltage was lower than Vref_L, system was in the mode of closing; When busbar voltage worked in [Vref_L, Vref_M], DC/DC converter (202) was in the MPPT maximum power point tracking working method; Greater than Vref_M during less than Vref_H, DC/DC converter (202) is in contrary MPPT maximum power point tracking working method in busbar voltage; When busbar voltage was higher than Vref_H, DC/DC converter (202) was in contrary MPPT maximum power point tracking and discharge circuit (204) is in the repid discharge working method.
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Cited By (1)
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| CN104184140A (en) * | 2014-08-07 | 2014-12-03 | 哈尔滨工程大学 | Control apparatus and control method for maintaining stable voltage of conflux DC bus in distributed power generation system |
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