CN102723725B - A kind of novel energy converting system and method - Google Patents
A kind of novel energy converting system and method Download PDFInfo
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- CN102723725B CN102723725B CN201110080286.5A CN201110080286A CN102723725B CN 102723725 B CN102723725 B CN 102723725B CN 201110080286 A CN201110080286 A CN 201110080286A CN 102723725 B CN102723725 B CN 102723725B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
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Abstract
The present invention relates to a kind of novel energy converting system, the two-way rectifier of upper level power network is connected to including input and output end is connected to the two-way inverter of next stage power network, the input of the output end of the two-way rectifier and two-way inverter is connected respectively to dc bus, and the dc bus is connected to energy storage device.The present invention also provides a kind of novel energy conversion method.The present invention realizes the energy conversion between the superior and the subordinate's power network by two-way rectifier and two-way inverter, can be provided for micro-capacitance sensor " backbone network " so that the structure of micro-capacitance sensor is not necessarily dependent on the capacity of bulk power grid.
Description
Technical field
The present invention relates to power grid energy conversion art, turns more specifically to the ability between a kind of two-stage power network up and down
Change system and method.
Background technology
Micro-capacitance sensor is often referred to by distributed power source, energy storage device, energy conversion device, associated loadings and monitoring, protection dress
The small-sized electric system collected is put, self-contr ol, protection and the autonomous system of management can be realized by being one.Micro-capacitance sensor
Both can be incorporated into the power networks with external electrical network, can also isolated operation, be the focus studied at present, USDOE is even more by micro- electricity
Net is considered as one of three big basic technologies of Future Power System.
Energy conversion system (PCS) is the core of micro-capacitance sensor and energy-accumulating power station.As shown in figure 1, traditional energy conversion system
System 14 is a support energy in bidirectional flow AC/DC current transformer.Under normal condition, micro-capacitance sensor 12 is joined directly together with bulk power grid 11,
Energy conversion system 14 by adjust energy stream always to micro-capacitance sensor supplement energy or by energy be stored in energy storage device 15；Big electricity
When net 11 breaks down, switch 13 disconnects, and energy conversion system 14 switches to electric source modes, powered to micro-capacitance sensor 12.
Conventional energy converting system is fairly simple, but is not decoupled between bulk power grid and microgrid, and its reliability service relies on
One strong bulk power grid, above there is significant limitation in application.On some remote mountain areas or island, bulk power grid load energy
Power is poor, and conventional energy converting system can not reliable networking.New energy power network exactly concentrates more remote area at present, greatly
Power network can not provide enough supports, cause new energy can not sent with not falling.
The content of the invention
The technical problem to be solved in the present invention is, for existing energy conversion system when bulk power grid load-bearing capacity is poor
Can not reliable networking the defects of, there is provided a kind of novel energy converting system and method.
The technical solution adopted for the present invention to solve the technical problems is：A kind of novel energy converting system, including input
End is connected to the two-way rectifier of upper level power network and output end is connected to the two-way inverter of next stage power network, described two-way whole
Flow the output end of device and the input of two-way inverter is connected respectively to dc bus, the dc bus is connected to energy storage dress
Put, the upper level power network includes civil power or diesel-driven generator, and the next stage power network includes user load and combining inverter；
Also include input sample unit and Commutation control unit, the input sample unit is used to sample from upper level electricity
The input voltage and input current of net, the Commutation control unit are adjusted according to the power instruction obtained from energy management system
Whole two-way rectifier with realize invariable power input；
Also include output sampling unit and inversion control unit, the output sampling unit is used to sample to next stage power network
Output voltage, output current and outputting inductance electric current, the inversion control unit by sampling and outputting voltage and with reference to electricity
Pressure is compared, and then by pi regulator, pi regulator, which exports, gives inner ring current regulator, and control PWM outputs are to realize pair
The Isobarically Control of output voltage.
In novel energy converting system of the present invention, the input of the two-way rectifier is via LC filter circuits
It is connected to upper level power network.
The present invention also provides a kind of novel energy conversion method, comprises the following steps：
Power instruction is obtained from energy management system, wherein power instruction is P including input power；
Judge whether power network, itself capacity and energy storage device energy can meet the needs of power instruction, power refers to if meeting
During the demand of order, rectifier is operated by power instruction, and is instruction setting value P by input power control, while by double
To transformer output voltage is provided for next stage power network；If judging, itself capacity and energy storage device can not meet wanting for power instruction
Ask, be then not responding to power instruction, the upper level power network includes civil power or diesel-driven generator, and the next stage power network includes user
Load and combining inverter；
It is operated in rectifier by power instruction, and input power control is included for the step of instruction setting value P：
It is then defeated by pi regulator, pi regulator by voltage source inverter sampling and outputting voltage and compared with reference voltage
Go out to give inner ring current regulator, control PWM is exported to realize the control to output voltage.
In novel energy conversion method of the present invention, by two-way rectifier by three from upper level power network
Before cross streams electricity is converted into DC supply input dc bus, the three-phase alternating current also including the use of LC filter circuits to upper level power network
Electricity is filtered.
The novel energy converting system and method for the present invention, the superior and the subordinate are realized by two-way rectifier and two-way inverter
Energy conversion between power network, it can be provided for micro-capacitance sensor " backbone network " so that the structure of micro-capacitance sensor is not necessarily dependent on the appearance of bulk power grid
Amount.Energy conversion system of the present invention makes " backbone network " can not only meet the power demand of traditional load, and existing wind energy becomes
The stream device such as device and photovoltaic DC-to-AC converter is not required to do any change and may be incorporated into.
Brief description of the drawings
Below in conjunction with drawings and Examples, the invention will be further described, in accompanying drawing：
Fig. 1 is the structural representation of existing energy conversion system；
Fig. 2 is the structural representation of novel energy converting system of the present invention；
Fig. 3 is the structural representation of the embodiment of energy conversion system in Fig. 2；
Fig. 4 is the structural representation of novel energy conversion method embodiment of the present invention；
Fig. 5 is the schematic diagram of rectifier power limitation control；
Fig. 6 is the schematic diagram of inverter Isobarically Control.
Embodiment
In order to which technical characteristic, purpose and the effect of the present invention is more clearly understood, now compares accompanying drawing and describe in detail
The embodiment of the present invention.
As shown in Figure 2 and Figure 3, it is the schematic diagram of novel energy converting system embodiment of the present invention.In the present embodiment, should
Novel energy converting system includes a two-way rectifier 21 and a two-way inverter 22, and the two supports energy bidirectional flow
Dynamic, the input of wherein two-way rectifier 21 is connected to upper level power network (such as civil power or diesel-driven generator etc.), two-way inversion
The output end of device 22 is connected to next stage power network (such as user load and combining inverter etc.).In above-mentioned novel energy converting system
In, the input of the output end of two-way rectifier 21 and two-way inverter 22 is connected respectively to dc bus 24, and direct current is female
Line 24 is connected to energy storage device 23.So energy can between upper level power network, energy storage device, next stage power network multidirectional stream
It is dynamic.
Pass through management and control of the novel energy converting system to energy, for upper level power network, novel energy conversion
System is a controllable load, not only reduces the impact to power network, can also aid in stable power network；For user terminal,
Novel energy converting system is a uninterrupted power source, is continuously user terminal and provides reliable and stable electric energy.
In above-mentioned novel energy converting system, in order to realize that the invariable power of input inputs, it may also include input and adopt
Sample unit and Commutation control unit, wherein input sample unit are used to sample input voltage and input electricity from upper level power network
Stream, and Commutation control unit is according to the power instruction (power instruction obtained from energy management system (upper level power network)
It is P including input power, symbol represents that the flow direction of energy, such as symbol represent that energy is flowed into by upper level power network to be positive, symbol
Upper level power network is flowed into for negative indication energy) judge whether power network, itself capacity and energy storage device energy can meet power instruction
Demand, if meet the needs of power instruction, rectifier is operated by power instruction, and by input power control for instruction
Setting value P, is otherwise not responding to power instruction, so as to realize that invariable power inputs.
In addition, in above-mentioned novel energy converting system, in order to realize output end voltage constant, also settable output is adopted
Sample unit and inversion control unit, wherein output sampling unit is for output voltage of the sampling to next stage power network, output current
And then outputting inductance electric current, inversion control unit are adjusted by sampling and outputting voltage and compared with reference voltage by PI
Device is saved, pi regulator, which exports, gives inner ring current regulator, and control PWM is exported to realize the Isobarically Control to output voltage.
Above-mentioned input sample unit, Commutation control unit, output sampling unit and inversion control unit can be logic list
Member, in actual applications, one or more DSP (digital signal processor) and corresponding software can be used to realize.
Pass through invariable power input and constant pressure output control so that the novel energy converting system can be applied to bulk power grid load
Poor occasion, such as some remote districts or island and wind power plant, photovoltaic power generation equipment etc..
In order to further enhance using effect, LC filter circuits can be increased in the input of two-way rectifier 21, i.e., it is two-way
Rectifier 21 is connected to upper level power network via LC filter circuits.
In addition, the present invention also provides a kind of novel energy conversion method, this method realizes two-stage by reversible transducer
The decoupling of power network, wherein rectifier and inverter can be with independent controls.This method comprises the following steps：
Step S41：Power instruction is obtained from energy management system, wherein power instruction is P including input power, symbol
Number represent that (such as symbol represents that energy is flowed into by upper level power network to be positive, and symbol is on negative indication energy flows into for the flow direction of energy
One-level power network).
Step S42：Judge whether power network, itself capacity and energy storage device energy can meet the needs of power instruction.
Step S43：If meet the needs of power instruction, rectifier is operated by power instruction, and by input power
Control to instruct setting value P, while output voltage is provided for next stage power network by two-way transformer., will when being controlled
Setting voltage carries out PI regulations with actually entering difference in voltage, and carries out output control (as shown in Figure 5) to rectifier accordingly.
Step S44:Judge that itself capacity and energy storage device can not meet the requirement of power instruction, be then not responding to power instruction
(such as being powered by energy storage device energy for next stage power network).
Aforementioned four step performs in energy conversion device access Posterior circle.
In the above-mentioned methods, in order to provide stable electric energy to next stage power network, voltage-type inversion can be used in step S43
Device carrys out control targe regulated output voltage, and the control method is as follows：Pass through voltage source inverter sampling and outputting voltage
(Vfeedback) and compared with reference voltage (Vref), then exported by pi regulator and give inner ring current regulator, controlled
PWM outputs processed, so as to realize the control to output voltage, as shown in Figure 6.
In order to strengthen overall efficacy, the three-phase alternating current from upper level power network can also converted by two-way rectifier
Before DC supply input dc bus, the three-phase alternating current of upper level power network is filtered using LC filter circuits.
Embodiments of the invention are described above in conjunction with accompanying drawing, but the invention is not limited in above-mentioned specific
Embodiment, above-mentioned embodiment is only schematical, rather than restricted, one of ordinary skill in the art
Under the enlightenment of the present invention, in the case of present inventive concept and scope of the claimed protection is not departed from, it can also make a lot
Form, these are belonged within the protection of the present invention.
Claims (4)
- A kind of 1. novel energy converting system, it is characterised in that：The two-way rectifier of upper level power network is connected to including input And output end is connected to the two-way inverter of next stage power network, the input of the output end of the two-way rectifier and two-way inverter End is connected respectively to dc bus, and the dc bus is connected to energy storage device, and the upper level power network includes civil power or diesel oil Generator, the next stage power network include user load and combining inverter；Also include input sample unit and Commutation control unit, the input sample unit is used to sample from upper level power network Input voltage and input current, the Commutation control unit adjust double according to the power instruction obtained from energy management system To rectifier with realize invariable power input；Also include output sampling unit and inversion control unit, the output sampling unit is used to sample to the defeated of next stage power network Go out voltage, output current and outputting inductance electric current, the inversion control unit is entered by sampling and outputting voltage and with reference voltage Row compares, and then by pi regulator, pi regulator, which exports, gives inner ring current regulator, and control PWM is exported to realize to output The Isobarically Control of voltage.
- 2. novel energy converting system according to claim 1, it is characterised in that the input warp of the two-way rectifier Upper level power network is connected to by LC filter circuits.
- A kind of 3. novel energy conversion method, it is characterised in that：Comprise the following steps：Power instruction is obtained from energy management system, wherein power instruction is P including input power；Judge whether power network, itself capacity and energy storage device energy can meet the needs of power instruction, if meeting power instruction During demand, two-way rectifier is operated by power instruction, and be instruction setting value P by input power control, pass through simultaneously Two-way transformer provides output voltage for next stage power network；If judging, itself capacity and energy storage device can not meet power instruction It is required that being then not responding to power instruction, upper level power network includes civil power or diesel-driven generator, and the next stage power network is born including user Load and combining inverter；It is operated in rectifier by power instruction, and input power control is included for the step of instruction setting value P：Pass through Voltage source inverter sampling and outputting voltage and compared with reference voltage, then by pi regulator, pi regulator export to Inner ring current regulator, control PWM are exported to realize the Isobarically Control to output voltage.
- 4. novel energy conversion method according to claim 3, it is characterised in that upper that will be come from by two-way rectifier Before the three-phase alternating current of one-level power network is converted into DC supply input dc bus, also including the use of LC filter circuits to upper level electricity The three-phase alternating current of net is filtered.
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| CN201110080286.5A CN102723725B (en) | 2011-03-31 | 2011-03-31 | A kind of novel energy converting system and method |
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| CN201110080286.5A CN102723725B (en) | 2011-03-31 | 2011-03-31 | A kind of novel energy converting system and method |
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| CN102723725B true CN102723725B (en) | 2018-01-23 |
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| CN105896623A (en) * | 2016-06-08 | 2016-08-24 | 国网辽宁省电力有限公司电力科学研究院 | AC/DC hybrid power distribution system based on multi-terminal flexible DC power transmission technology |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101071163A (en) * | 2007-06-29 | 2007-11-14 | 株洲南车时代电气股份有限公司 | Current converter test circuit |
| CN101567638A (en) * | 2009-01-14 | 2009-10-28 | 南京航空航天大学 | Active output direct-current component control inverter and control method thereof |
| CN201656806U (en) * | 2010-03-23 | 2010-11-24 | 浙江大学 | Liquid phase pulse plasma power based on constant power charging system |
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2011
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101071163A (en) * | 2007-06-29 | 2007-11-14 | 株洲南车时代电气股份有限公司 | Current converter test circuit |
| CN101567638A (en) * | 2009-01-14 | 2009-10-28 | 南京航空航天大学 | Active output direct-current component control inverter and control method thereof |
| CN201656806U (en) * | 2010-03-23 | 2010-11-24 | 浙江大学 | Liquid phase pulse plasma power based on constant power charging system |
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Effective date of registration: 20191122 Address after: 215000 No.16, Youxiang Road, Yuexi, Wuzhong District, Suzhou City, Jiangsu Province Patentee after: Suzhou Huichuan Technology Co.,Ltd. Address before: 518101 Guangdong city of Shenzhen province Baoan District no 70 District Liu Xian two road Hongwei Dong Industrial Zone E Patentee before: Shenzhen Huichuan Technology Co., Ltd. |
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