CN103904638A - Direct-current distributed load system based on three-port converter and control method thereof - Google Patents
Direct-current distributed load system based on three-port converter and control method thereof Download PDFInfo
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Abstract
The invention discloses a direct-current distributed load system based on a three-port converter and a control method thereof and belongs to the field of power electronics conversion and distributed load systems. The system comprises a direct-current input power supply (10), a power conversion unit (20) composed of N three-port sub-converters, and a load (30) composed of N sub-loads, wherein N is a natural number larger than 1, the output end of the direct-current input power supply serves as an input end voltage bus of the system, the input end of each three-port sub-converter is connected to the input end voltage bus, the energy storage end of each three-port sub-converter is connected to an energy storage end voltage bus, and the output end of each three-port sub-converter is connected with a corresponding sub-load in series. According to the system, a hybrid power control strategy that energy storage end current sharing is conducted during charging of an energy storage device and input end power is distributed according to the intensity of output power during discharging of the energy storage device is adopted based on the charging and discharging states of the energy storage device, and stable and reliable operation of the system is achieved.
Description
Technical field
The present invention relates to a kind of direct current distributed terminator system and control method thereof based on three port converters, belong to Technics of Power Electronic Conversion and distributed terminator 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, grid-connected power generation system become countries in the world pay close attention to and research focus.In same grid-connected power generation system, may there is multiple same natures or multiple distributed terminator of different nature, in order to meet the power demands of distributed terminator simultaneously, common solution is to adopt two-stage type power conversion system, first by one-level DC/DC converter, new forms of energy are changed into direct current output, and be output as common DC bus with this DC/DC converter, be then connected in series respectively a DC/DC converter and power separately to each distributed terminator.
In addition, 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, guarantee continuity and the reliability of power supply.Therefore, between energy storage device and common DC bus, also need two-way DC/DC converter to connect, to realize power bi-directional transmission.
But, while adopting said system structure, when power transmits under three kinds of situations from input source to load, from input source to energy storage device and from energy storage device to load etc., all need through 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 terminator 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 terminator system based on three port converters of the present invention, comprise direct-current input power supplying, power conversion unit and load, it is characterized in that: described power conversion unit comprises N sub three port converters, described load comprises N sub-load, N is greater than 1 natural number, the output of direct-current input power supplying is as system input voltage bus, the input of every height three port converters is all connected to input terminal voltage bus, the energy storage end of every height three port converters is all connected to energy storage terminal voltage bus, the output of every height three port converters is all connected in series a sub-load.
Described direct-current input power supplying is direct voltage source or renewable energy source current, can be that single power supply also can be made up of multiple power supply connection in series-parallel.
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 terminator 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 charged state, 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
inrefafter stack as the given signal of these son three port converter input terminal voltages, with this son three port converter input terminal voltage feedback signal v
inafter regulating, input terminal voltage adjuster obtains both error signal v
c, this error signal intercepts driving signal as control signal and the carrier signal friendship of input terminal voltage, thereby realizes the control of these son three port converters;
B. when energy storage device is during in discharge condition, each sub three port converter using are distributed the control strategy of input power according to power output size separately, and concrete control procedure is as follows:
By the energy storage end current i of each sub three port converters
bdivided by power output p separately
ocarry out standardization, obtain the energy storage end electric current perunit value i of each sub three port converters
* b, using the mean value of each sub three port converter energy storage end electric current perunit values or maximum as energy storage end mark the one 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 marks the one electric current, with each sub three port converter energy storage end marks the one current signal i
* bafter regulating, the equal throttle regulator of energy storage end mark the one electric current obtains both error signal v
bCS, this error signal and reference voltage v
inrefafter stack as the given signal of these son three port converter input terminal voltages, with this son three port converter input terminal voltage feedback signal v
inafter regulating, input terminal voltage adjuster obtains both error signal v
c, this error signal intercepts driving signal as control signal and the carrier signal friendship of input terminal voltage, thereby realizes the control of these son three port converters.
The present invention has following beneficial effect:
(1) owing to adopting distributed terminator structure, each output loading end can independently be controlled, and has reduced influencing each other between each sub-load, power supply when having met multiple heterogeneitys or demand load;
(2) power conversion from direct-current input power supplying to load, from direct-current input power supplying to energy storage device and from energy storage device to load etc. under three kinds of situations 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 input power while adopting the current-sharing of energy storage device when charging energy storage end, energy storage device electric discharge according to power output size separately, has guaranteed stable, the reliability service of system under different operating modes.
Accompanying drawing explanation
Accompanying drawing 1 is the direct current distributed terminator system embodiment structural representation 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 charged state of the present invention;
The control circuit figure of son three port converters when accompanying drawing 3 is energy storage device discharge condition of the present invention;
Accompanying drawing 4 is the structural representation of the direct current distributed terminator 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; 30-load; v
in1～v
inN-1～N sub three port converter input terminal voltages; 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; p
o1～p
oN-1～N sub three port converter power outputs; i
* b1～i
* bN-1～N sub three port converter energy storage end electric current perunit values; i
b_bus-tri-port converter energy storage end current equalizing bus bar voltages; i
* b_bus-tri-port converter energy storage end marks the one current equalizing bus bar voltage; v
inref1～v
inrefN-1～N sub three port converter input terminal voltage fiducial values; The equal throttle regulator of energy storage end of BCS1～BCSN-1st～N sub three port converters; The input terminal voltage adjuster of IVR1～IVRN-1st～N sub three port converters; v
bCS1～v
bCSNthe energy storage end current-sharing regulator output voltage of-1～N sub three port converters; v
c1～v
cN-1～N sub three port converter input control voltages; PV, PV1, PV2-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, R
o1, R
o1-output loading; v
o-output voltage; i
o-output current; i
in-input current.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described.
The direct current distributed terminator system configuration 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 and load 30, wherein: direct-current input power supplying 10 adopts the photovoltaic array in renewable energy source current, power conversion unit 20 comprises N sub three port converters, load 30 comprises N sub-load, N is greater than 1 natural number, the output of photovoltaic array is as system input voltage bus, the input of every height three port converters is all connected to input terminal voltage bus, the energy storage end of every height three port converters is all connected to energy storage terminal voltage bus, the output of every height three port converters is all connected in series a sub-load.
The control method of the direct current distributed terminator 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 charged state, the control strategy of each sub three port converter using energy storage end current-sharings;
B. when energy storage device is during in discharge condition, each sub three port converter using are distributed the control strategy of input power according to power output size separately.
Below in conjunction with accompanying drawing 2～accompanying drawing 3, the Poewr control method of the direct current distributed terminator system based on above-described embodiment is made a concrete analysis of.
The control circuit figure of son three port converters while being as shown in Figure 2 energy storage device charged state of the present invention.In the present embodiment, adopt the current equalizing structure of ring in energy storage end current-sharing outer shroud, input terminal voltage, wherein energy storage end current equalizing bus bar voltage producing method is for averaging, and flow equalizing ring and Voltage loop all adopt pi regulator structure.
Take 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 of energy storage device charged state.
The producing method of energy storage end current equalizing bus bar voltage is for averaging, that is:
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
inrefk) after stack as the given signal of these son three port converter input terminal voltages, with this son three port converter input terminal voltage feedback signal (v
ink) after regulating, input terminal voltage adjuster (IVRk) obtains both error signal v
ck, this error signal intercepts driving signal as control signal and the carrier signal friendship of input terminal voltage, thereby realizes the control of these son three port converters.
The control circuit figure of son three port converters while being as shown in Figure 3 energy storage device discharge condition of the present invention.In the present embodiment, adopt the current equalizing structure of ring in energy storage end mark the one electric current current-sharing outer shroud, input terminal voltage, wherein energy storage end 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.
Take the control of k sub three port converters as example, introduce in detail its in the time of energy storage device discharge condition according to power output size is distributed input power separately detailed process.
First the energy storage end electric current of each sub three port converter modules is carried out to standardization divided by power output separately, obtains its energy storage end electric current perunit value:
Then the each energy storage end electric current perunit value obtaining is carried out to equilibrium and control, adopt similar energy storage end sharing control structure, the producing method of energy storage end mark the one current equalizing bus bar voltage is for averaging, that is:
This signal is as the given signal of each sub three port converter energy storage end marks the one electric current, with the energy storage end electric current perunit value (i of k sub three port converter modules
* bk) relatively, after regulating, energy storage end mark the one equal throttle regulator of electric current (BCSk) obtains both error signal (v
bCSk), this error signal and reference voltage (v
inrefk) after stack as the given signal of these son three port converter input terminal voltages, with this son three port converter input terminal voltage feedback signal (v
ink) after regulating, input terminal voltage adjuster (IVRk) obtains both error signal v
ck, this error signal intercepts driving signal as control signal and the carrier signal friendship of input terminal voltage, thereby realizes the control of these son three port converters.
A kind of embodiment of the present invention is the direct current distributed terminator 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 output of two son three port converters meets respectively two sub-load R
o1and R
o2, input and energy storage end 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
in1and i
in2be respectively the input electric current of two sons, three port converters, i
b1and i
b2be respectively the energy storage end electric current of two sons, three port converters, v
o1and v
o2be respectively the output end voltage of two son three port converters, p
o1for the output power of 1# three port converters.The watt level of system input is 150W, and the output power of 2# three port converters is fixed as 60W, and the output power of 1# three port converters changes between 70W-120W.As shown in Figure 6, before the output increased power of 1# three port converters, system, in battery state of charge, now adopts energy storage end sharing control, has i
b1=i
b2, have i according to power relation input electric current
in1>i
in2;when after the output increased power of 1# three port converters, storage battery, in discharge condition, now distributes input power (120W/60W) according to output watt level, has i
in1=2i
in2, accumulator terminal electric current also meets similarity relation: i simultaneously
b1=2i
b2; Change moment at the output power of 1# three port converters, the output end voltage of two son three port converters all almost remains unchanged, and has guaranteed 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 terminator system based on three port converters, comprise direct-current input power supplying (10), power conversion unit (20) and load (30), it is characterized in that: described power conversion unit (20) comprises N sub three port converters, described load (30) comprises N sub-load, N is greater than 1 natural number, the output of direct-current input power supplying is as system input voltage bus, the input of every height three port converters is all connected to input terminal voltage bus, the energy storage end of every height three port converters is all connected to energy storage terminal voltage bus, the output of every height three port converters is all connected in series a sub-load.
2. the direct current distributed terminator system based on three port converters according to claim 1, it is characterized in that: described direct-current input power supplying (10) is direct voltage source or renewable energy source current, can be that single power supply also can be made up of multiple power supply connection in series-parallel.
3. the direct current distributed terminator 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 terminator 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 charged state, 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
inrefafter stack as the given signal of these son three port converter input terminal voltages, with this son three port converter input terminal voltage feedback signal v
inafter regulating, input terminal voltage adjuster obtains both error signal v
c, this error signal intercepts driving signal as control signal and the carrier signal friendship of input terminal voltage, thereby realizes the control of these son three port converters;
B. when energy storage device is during in discharge condition, each sub three port converter using are distributed the control strategy of input power according to power output size separately, and concrete control procedure is as follows:
By the energy storage end current i of each sub three port converters
bdivided by power output p separately
ocarry out standardization, obtain the energy storage end electric current perunit value i of each sub three port converters
* b, using the mean value of each sub three port converter energy storage end electric current perunit values or maximum as energy storage end mark the one 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 marks the one electric current, with each sub three port converter energy storage end marks the one current signal i
* bafter regulating, the equal throttle regulator of energy storage end mark the one electric current obtains both error signal v
bCS, this error signal and reference voltage v
inrefafter stack as the given signal of these son three port converter input terminal voltages, with this son three port converter input terminal voltage feedback signal v
inafter regulating, input terminal voltage adjuster obtains both error signal v
c, this error signal intercepts driving signal as control signal and the carrier signal friendship of input terminal voltage, thereby realizes the control of these son three port converters.
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| CN106711994A (en) * | 2017-01-09 | 2017-05-24 | 清华大学 | Control method and control system of distributed power source system |
| CN107749715A (en) * | 2017-11-17 | 2018-03-02 | 东南大学 | A kind of direct current power spring topology and its control method |
| CN108155790A (en) * | 2017-12-29 | 2018-06-12 | 北京天诚同创电气有限公司 | Two-way DC/DC converters and two-way voltage conversion system |
| CN108667337A (en) * | 2018-05-31 | 2018-10-16 | 西南交通大学 | Highpowerpulse load power source device with fast dynamic response and its control method |
| CN109980961A (en) * | 2019-03-26 | 2019-07-05 | 深圳市皓文电子有限公司 | The current equalizing method and inverter module of multidiameter delay Boost type inverter module |
| CN110212842A (en) * | 2019-06-06 | 2019-09-06 | 南通大学 | A kind of three port integrated form converters and control method for photovoltaic energy storage system |
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| CN106711994A (en) * | 2017-01-09 | 2017-05-24 | 清华大学 | Control method and control system of distributed power source system |
| WO2018126822A1 (en) * | 2017-01-09 | 2018-07-12 | 清华大学 | Control method and control system for a distributed power source energy generation system |
| US11283260B2 (en) | 2017-01-09 | 2022-03-22 | Tsinghua University | Control method and control system for a distributed power source energy generation system |
| CN107749715A (en) * | 2017-11-17 | 2018-03-02 | 东南大学 | A kind of direct current power spring topology and its control method |
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| CN108155790A (en) * | 2017-12-29 | 2018-06-12 | 北京天诚同创电气有限公司 | Two-way DC/DC converters and two-way voltage conversion system |
| CN108667337A (en) * | 2018-05-31 | 2018-10-16 | 西南交通大学 | Highpowerpulse load power source device with fast dynamic response and its control method |
| CN108667337B (en) * | 2018-05-31 | 2024-01-30 | 西南交通大学 | High-power pulse load power supply device with rapid dynamic response and control method thereof |
| CN109980961A (en) * | 2019-03-26 | 2019-07-05 | 深圳市皓文电子有限公司 | The current equalizing method and inverter module of multidiameter delay Boost type inverter module |
| CN109980961B (en) * | 2019-03-26 | 2021-01-15 | 深圳市皓文电子有限公司 | Current equalizing method of multi-path parallel Boost type inversion module and inversion module |
| CN110212842A (en) * | 2019-06-06 | 2019-09-06 | 南通大学 | A kind of three port integrated form converters and control method for photovoltaic energy storage system |
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