CN103956894A - Direct-current distributed power supply system based on three-port converters and control method thereof - Google Patents

Direct-current distributed power supply system based on three-port converters and control method thereof Download PDF

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CN103956894A
CN103956894A CN201410154886.5A CN201410154886A CN103956894A CN 103956894 A CN103956894 A CN 103956894A CN 201410154886 A CN201410154886 A CN 201410154886A CN 103956894 A CN103956894 A CN 103956894A
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energy storage
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signal
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CN103956894B (en
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吴红飞
张君君
邢岩
曹锋
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Nanjing University of Aeronautics and Astronautics
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Nanjing University of Aeronautics and Astronautics
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Abstract

The invention discloses a direct-current distributed power supply system based on three-port converters and a control method thereof, and belongs to the field of power electronic conversion and distributed power supply systems. The system comprises a direct-current input power supply (10) and a power conversion unit (20), wherein the direct-current input power supply (10) is composed of N subordinate direct-current input power supplies, the power conversion unit (20) is composed of N subordinate three-port converters, and N is a natural number larger than 1; each subordinate direct-current input power supply is connected with one subordinate three-port converter in series, the output ends of all the subordinate three-port converter are connected to an output end voltage bus, and the energy storage ends of all the subordinate three-port converters are connected to a storage end voltage bus. The energy storage end current sharing strategy is adopted when an energy storage device is in the discharging state, the hybrid power control strategy of distributing output end power according to the power of the input power supplies is adopted when the energy storage device is in the charging state, and then stable and reliable operation of the system can be achieved.

Description

A kind of direct current distributed power supply system and control method thereof based on three port converters
Technical field
The present invention relates to a kind of electric power system, relate in particular to a kind of direct current distributed power supply system and control method thereof based on three port converters, belong to Technics of Power Electronic Conversion and distributed power supply system field.
Background technology
Along with energy crisis and problem of environmental pollution day by day serious, the development and utilization of the new and renewable sources of energies such as solar energy, wind energy, fuel cell obtains paying close attention to more and more widely, distributed generation system become countries in the world pay close attention to and research focus.Because the generation of electricity by new energy devices such as solar cell exist supply of electric power unstable, discontinuous and with shortcomings such as changes in environmental conditions, need to be equipped with energy storage device peak power to be provided and to reclaim excess energy, ensure continuity and the reliability of power supply.
Current direct current distributed power supply system is mainly to realize distributed parallel connection at DC/DC converter place, be that each distributed new Blast Furnace Top Gas Recovery Turbine Unit (TRT) all connects a DC/DC converter, each energy conversion is become to direct current output, and being connected in parallel on common DC bus is load supplying.Each DC/DC converter is realized maximal power tracing, avoids influencing each other between each input source in centralized configuration, improves to greatest extent the overall conversion efficiency of system input power.Meanwhile, between energy storage device and common DC bus, also need two-way DC/DC converter to connect, to realize power bi-directional transmission.But, during from each input source to energy storage device through-put power, need two stage power conversion, thereby reduced the whole efficiency of system.
Summary of the invention
Goal of the invention:
The present invention is directed to the deficiencies in the prior art, a kind of direct current distributed power supply system and control method thereof based on three port converters is provided.
Technical scheme:
The present invention adopts following technical scheme for achieving the above object:
Direct current distributed power supply system based on three port converters of the present invention, comprise direct-current input power supplying, power conversion unit, output end voltage bus and energy storage terminal voltage bus, it is characterized in that: described direct-current input power supplying comprises N sub-direct-current input power supplying, described power conversion unit comprises N sub three port converters, N is greater than 1 natural number, every sub-direct-current input power supplying is all connected in series a son three port converters, the output of every height three port converters is all connected to output end voltage bus, the energy storage end of every height three port converters is all connected to energy storage terminal voltage bus.
Described direct-current input power supplying is direct voltage source or renewable energy source current.
Described three port converters are isolated form three-port DC converter or non-isolation type three-port DC converter.
Described three port converters comprise a DC voltage input end, an output and an energy storage end, and wherein energy storage end is bidirectional power port, and output is unidirectional power port or bidirectional power port.
Based on the control method of above-mentioned direct current distributed power supply system, the control method of all sub three port converters is identical, and its control procedure is divided into following two kinds of situations:
A. when energy storage device is during in discharge condition, the control strategy of each sub three port converter using energy storage end current-sharings, concrete control procedure is as follows:
Using the mean value of each sub three port converter energy storage end electric currents or maximum as energy storage end current equalizing bus bar voltage signal i b_bus, this signal is as the given signal of each sub three port converter energy storage end electric currents, with each sub three port converter energy storage end current feedback signal i bafter regulating, the equal throttle regulator of energy storage end obtains both error signal v bCS, this error signal and reference voltage v orefafter stack as the given signal of these son three port converter output terminal voltages, with this son three port converter output terminal voltage feedback signal v oafter regulating, output end voltage adjuster obtains both error signal v c, this error signal intercepts driving signal as control signal and the carrier signal friendship of output end voltage, thereby realizes the control of these son three port converters;
B. when energy storage device is during in charged state, each sub three port converter using are distributed the control strategy of output power according to input power watt level separately, and concrete control procedure is as follows:
By the output end current i of each sub three port converters odivided by input power power p separately incarry out standardization, obtain the output end current perunit value i of each sub three port converters * o, using the mean value of each sub three port converter output terminal electric current perunit values or maximum as output mark the one current equalizing bus bar voltage signal i * o_bus, this signal is as the given signal of each sub three port converter output terminal marks the one electric current, with each sub three port converter output terminal marks the one current signal i * oafter regulating, the equal throttle regulator of output mark the one electric current obtains both error signal v oCS, this error signal and reference voltage v orefafter stack as the given signal of these son three port converter output terminal voltages, with this son three port converter output terminal voltage feedback signal v oafter regulating, output end voltage adjuster obtains both error signal v c, this error signal intercepts driving signal as control signal and the carrier signal friendship of output end voltage, thereby realizes the control of these son three port converters.
The present invention has following beneficial effect:
(1) owing to adopting distributed DC input power, reduce influencing each other between each sub-direct-current input power supplying, improved the effect of system maximal power tracing;
(2) power conversion from each direct-current input power supplying to energy storage device is single-stage power conversion, has improved the whole efficiency of system;
(3) adopt the basic composition unit of integrated form three port converters as system, simplified the structure of system, improved the reliability of system;
(4) the Hybrid Power-Aware control strategy that distributes output power while adopting the current-sharing of energy storage device when electric discharge energy storage end, energy storage device charging according to input power watt level separately, has ensured stable, the reliability service of system under different operating modes.
Brief description of the drawings
Accompanying drawing 1 is the direct current distributed power supply system example structure schematic diagram based on three port converters of the present invention;
The control circuit figure of son three port converters when accompanying drawing 2 is energy storage device discharge condition of the present invention;
The control circuit figure of son three port converters when accompanying drawing 3 is energy storage device charged state of the present invention;
Accompanying drawing 4 is the structural representation of the direct current distributed power supply system of two three port converters formations of embodiments of the invention;
Accompanying drawing 5 is synchronous rectification formula half-bridge three-port DC converter circuit theory diagrams in the present embodiment;
Experimental result when accompanying drawing 6 normally moves for the present embodiment;
Symbol description in above accompanying drawing: 10-direct-current input power supplying; 20-power conversion unit; v in1~v inN-1~N sub-direct-current input power supplying voltage; i in1~i inN-1~N sub-direct-current input power supplying electric current; p in1~p inN-1~N sub-direct-current input power supplying power; i b1~i bN-1~N sub three port converter energy storage end electric currents; v o1~v oN-1~N sub three port converter output terminal voltages; i o1~i oN-1~N sub three port converter output terminal electric currents; i * o1~i * oN-1~N sub three port converter output terminal electric current perunit values; i b_bus-tri-port converter energy storage end current equalizing bus bar voltages; i * o_bus-tri-port converter output terminal marks the one current equalizing bus bar voltage; v oref1~v orefN-1~N sub three port converter output terminal voltage reference values; The equal throttle regulator of energy storage end of BCS1~BCSN-1st~N sub three port converters; The output end voltage adjuster of OVR1~OVRN-1st~N sub three port converters; The equal throttle regulator of the output mark of OCS1~OCSN-1st~N sub three port converters the one electric current; v bCS1~v bCSNthe energy storage end current-sharing regulator output voltage of-1~N sub three port converters; v oCS1~v oCSNthe output mark of-1~N sub three port converters the one electric current current-sharing regulator output voltage; v c1~v cN-1~N sub three port converter output terminal control voltages; PV1, PV2-1#, 2# photovoltaic array; C 1, C 2-input filter capacitor; Q 1~Q 4-switching tube; C o-output filter capacitor; L o-output inductor; R o-output loading; v o-output voltage; i o-output current; p o-power output.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described.
The direct current distributed power supply system structure based on three port converters of the embodiment of the present invention as shown in Figure 1, comprise direct-current input power supplying 10, power conversion unit 20, output end voltage bus and energy storage terminal voltage bus, wherein: direct-current input power supplying 10 adopts the photovoltaic array in renewable energy source current, comprise altogether N sub-photovoltaic array, power conversion unit 20 comprises N sub three port converters, N is greater than 1 natural number, the output of every sub-photovoltaic array is all connected in series a son three port converters, the output of every height three port converters is all connected to output end voltage bus, the energy storage end of every height three port converters is all connected to energy storage terminal voltage bus.
The control method of the direct current distributed power supply system based on above-described embodiment, the control method of all sub three port converters is identical, and its control procedure is divided into following two kinds of situations:
A. when energy storage device is during in discharge condition, the control strategy of each sub three port converter using energy storage end current-sharings:
Energy storage device electric discharge, shows that output power is greater than each input power sum, and now each sub-photovoltaic array is all operated in maximum power output state; In the time adopting energy storage end sharing control, the energy storage end sense of current of each sub three port converters is identical with size, does not have each other circulation; According to the three end power system conservation of energys, the power of input and energy storage end is known and controlled, and the power of each output is also determined;
B. when energy storage device is during in charged state, each sub three port converter using are distributed the control strategy of output power according to input power watt level separately:
Energy storage device charging, shows that output power is less than the maximum power sum that each sub-photovoltaic array can provide, and now parton photovoltaic array can be operated in non-maximum power output state; When the output power of each sub three port converter modules divides timing according to its input power size, according to the conservation of energy, the power of its energy storage end is also to distribute according to identical ratio, and therefore the power distribution result of the each power path of system is unique.
Below in conjunction with accompanying drawing 2~accompanying drawing 3, the Poewr control method of the direct current distributed power supply system based on above-described embodiment is made a concrete analysis of.
The control circuit figure of energy storage device of the present invention son three port converters in the time of discharge condition as shown in Figure 2.In the present embodiment, adopt the current equalizing structure of ring in energy storage current-sharing outer shroud, output voltage, wherein energy storage current equalizing bus bar voltage producing method is for averaging, and flow equalizing ring and Voltage loop all adopt pi regulator structure.
Taking the control of k sub three port converters as example, introduce in detail the detailed process of its energy storage end sharing control in the time that energy storage device discharges.
Energy storage end current equalizing bus bar voltage signal (i b_bus) producing method for averaging, that is:
i b _ bus = 1 N ( i b 1 + i b 2 + L + i bk + L + i bN ) - - - ( 1 )
This signal is as the given signal of each sub three port converter energy storage end electric currents, with k sub three port converter energy storage end current feedback signal (i bk) after regulating, the equal throttle regulator of energy storage end (BCSk) obtains both error signal (v bCSk), this error signal and reference voltage (v orefk) after stack as the given signal of these son three port converter output terminal voltages, with this son three port converter output terminal voltage feedback signal (v ok) after regulating, output end voltage adjuster (OVRk) obtains both error signal v ck, this error signal intercepts driving signal as control signal and the carrier signal friendship of output end voltage, thereby realizes the control of these son three port converters.
The control circuit figure of energy storage device of the present invention son three port converters in the time of charged state as shown in Figure 3.In the present embodiment, adopt the current equalizing structure of ring in output mark the one electric current current-sharing outer shroud, output voltage, wherein output mark the one current equalizing bus bar voltage producing method is for averaging, and flow equalizing ring and Voltage loop all adopt pi regulator structure.
Taking the control of k sub three port converters as example, introduce in detail its in the time that energy storage device charge according to the detailed process of input power watt level distribution output power separately.
First the output end current of each sub three port converter modules is carried out to standardization divided by input power power separately, obtains its output end current perunit value:
i ok * = i ok p ink = i ok v ink · i ink - - - ( 2 )
Then the each output end current perunit value obtaining is carried out to equilibrium and control, adopt similar energy storage end sharing control structure, the producing method of output mark the one current equalizing bus bar voltage is for averaging, that is:
i o _ bus * = 1 N ( i o 1 * + i o 2 * + L + i ok * + L + i oN * ) - - - ( 3 )
This signal is as the given signal of each sub three port converter output terminal marks the one electric current, with the output end current perunit value (i of k sub three port converter modules * ok) relatively, after regulating, output mark the one equal throttle regulator of electric current (OCSk) obtains both error signal (v oCSk), this error signal and reference voltage (v orefk) after stack as the given signal of these son three port converter output terminal voltages, with this son three port converter output terminal voltage feedback signal (v ok) after regulating, output end voltage adjuster (OVRk) obtains both error signal v ck, this error signal intercepts driving signal as control signal and the carrier signal friendship of output end voltage, thereby realizes the control of these son three port converters.
A kind of embodiment of the present invention is the direct current distributed power supply system being made up of two three port converters, and wherein energy storage device is that storage battery, load are resistive load, and its system configuration schematic diagram as shown in Figure 4.The input of two son three port converters accesses respectively two sub-photovoltaic array PV1 and PV2, and energy storage end and output are connected in parallel respectively.
In the present embodiment, each sub three port converters are chosen synchronous rectification formula half-bridge three-port DC converter topology, and physical circuit schematic diagram as shown in Figure 5.Wherein, Q 3and Q 4be respectively Q 1and Q 2synchronous rectifier, control respectively Q 1and Q 2duty recently realize the control of input (energy storage end) and output end voltage.
Based on system configuration of the present invention and control method, the experimental result of the present embodiment in the time of normal operation as shown in Figure 6.In figure, i b1and i b2be respectively the energy storage end electric current of two sons, three port converters, v oand i obe respectively output end voltage and the output end current of system, now the watt level relation of two inputs is p in1> p in2.As shown in Figure 6, before output increased power, system is in battery state of charge, now distributes power according to sub three port converter input watt levels separately, has i b1> i b2; When after output increased power, storage battery, in discharge condition, now adopts energy storage end sharing control, has i b1=i b2; Change moment at output power, output end voltage almost remains unchanged, and has ensured the stable power-supplying of load end simultaneously.Experimental result shows, adopts system configuration of the present invention and control method, can realize stable, the reliability service of system.

Claims (5)

1. the direct current distributed power supply system based on three port converters, comprise direct-current input power supplying (10), power conversion unit (20), output end voltage bus and energy storage terminal voltage bus, it is characterized in that: described direct-current input power supplying (10) comprises N sub-direct-current input power supplying, described power conversion unit (20) comprises N sub three port converters, N is greater than 1 natural number, every sub-direct-current input power supplying is all connected in series a son three port converters, the output of every height three port converters is all connected to output end voltage bus, the energy storage end of every height three port converters is all connected to energy storage terminal voltage bus.
2. the direct current distributed power supply system based on three port converters according to claim 1, is characterized in that: described direct-current input power supplying (10) is direct voltage source or renewable energy source current.
3. the direct current distributed power supply system based on three port converters according to claim 1, is characterized in that: described three port converters are isolated form three-port DC converter or non-isolation type three-port DC converter.
4. three-port DC converter according to claim 3, it is characterized in that: described three-port DC converter comprises a DC voltage input end, an output and an energy storage end, wherein energy storage end is bidirectional power port, and output is unidirectional power port or bidirectional power port.
5. the control method based on the direct current distributed power supply system based on three port converters claimed in claim 1, is characterized in that: the control method of all sub three port converters is identical, and its control procedure is divided into following two kinds of situations:
A. when energy storage device is during in discharge condition, the control strategy of each sub three port converter using energy storage end current-sharings, concrete control procedure is as follows:
Using the mean value of each sub three port converter energy storage end electric currents or maximum as energy storage end current equalizing bus bar voltage signal i b_bus, this signal is as the given signal of each sub three port converter energy storage end electric currents, with each sub three port converter energy storage end current feedback signal i bafter regulating, the equal throttle regulator of energy storage end obtains both error signal v bCS, this error signal and reference voltage v orefafter stack as the given signal of these son three port converter output terminal voltages, with this son three port converter output terminal voltage feedback signal v oafter regulating, output end voltage adjuster obtains both error signal v c, this error signal intercepts driving signal as control signal and the carrier signal friendship of output end voltage, thereby realizes the control of these son three port converters;
B. when energy storage device is during in charged state, each sub three port converter using are distributed the control strategy of output power according to input power watt level separately, and concrete control procedure is as follows:
By the output end current i of each sub three port converters odivided by input power power p separately incarry out standardization, obtain the output end current perunit value i of each sub three port converters * o, using the mean value of each sub three port converter output terminal electric current perunit values or maximum as output mark the one current equalizing bus bar voltage signal i * o_bus, this signal is as the given signal of each sub three port converter output terminal marks the one electric current, with each sub three port converter output terminal marks the one current signal i * oafter regulating, the equal throttle regulator of output mark the one electric current obtains both error signal v oCS, this error signal and reference voltage v orefafter stack as the given signal of these son three port converter output terminal voltages, with this son three port converter output terminal voltage feedback signal v oafter regulating, output end voltage adjuster obtains both error signal v c, this error signal intercepts driving signal as control signal and the carrier signal friendship of output end voltage, thereby realizes the control of these son three port converters.
CN201410154886.5A 2014-04-17 2014-04-17 A kind of direct current distributed power supply system and its control method based on three Port Translation devices Expired - Fee Related CN103956894B (en)

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CN105375552A (en) * 2015-09-01 2016-03-02 西安特锐德智能充电科技有限公司 Power matching method of matrix power distribution charging system
CN106711994A (en) * 2017-01-09 2017-05-24 清华大学 Control method and control system of distributed power source system
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CN111224392A (en) * 2020-01-03 2020-06-02 云南电网有限责任公司电力科学研究院 Three-port direct current energy router power coordination control method
CN111628650A (en) * 2020-06-16 2020-09-04 西安微电子技术研究所 DC/DC circuit, SIMO converter, microsatellite power supply system and working method
CN113922671A (en) * 2021-10-21 2022-01-11 国网经济技术研究院有限公司 Three-port flexible direct-current transmission DC-DC converter and control method thereof

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