CN105375515A - Modularized multi-level comprehensive apparatus combined with photovoltaic generation - Google Patents

Modularized multi-level comprehensive apparatus combined with photovoltaic generation Download PDF

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Publication number
CN105375515A
CN105375515A CN201510765337.6A CN201510765337A CN105375515A CN 105375515 A CN105375515 A CN 105375515A CN 201510765337 A CN201510765337 A CN 201510765337A CN 105375515 A CN105375515 A CN 105375515A
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China
Prior art keywords
submodule
photovoltaic generation
brachium pontis
compensation arrangement
photovoltaic
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CN201510765337.6A
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Chinese (zh)
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CN105375515B (en
Inventor
袁佳歆
薛钢
陈柏超
田翠华
杨雨桐
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Wuhan University WHU
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Wuhan University WHU
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Classifications

    • H02J3/383—
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/01—Arrangements for reducing harmonics or ripples
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
    • H02J3/1821—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators
    • H02J3/1835—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control
    • H02J3/1842—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control wherein at least one reactive element is actively controlled by a bridge converter, e.g. active filters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/28—Arrangements for balancing of the load in a network by storage of energy
    • H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
    • 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
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy
    • Y02E10/56—Power conversion systems, e.g. maximum power point trackers
    • 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
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/30—Reactive power compensation
    • 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
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/40—Arrangements for reducing harmonics
    • 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
    • Y02E70/00—Other energy conversion or management systems reducing GHG emissions
    • Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Inverter Devices (AREA)

Abstract

The invention discloses a modularized multi-level comprehensive apparatus combined with photovoltaic generation, and a control method. The modularized multi-level comprehensive apparatus combined with the photovoltaic generation comprises three phases; each phase comprise two bridge arms; each bridge arm is connected with a bridge arm inductor L1 in series through a plurality of sub modules including storage batteries and photovoltaic generation apparatuses, then the bridge arm is connected to a power grid in parallel through an inductor L2 and a switch K. The modularized multi-level comprehensive apparatus adopts the modularized structure, and can be connected with the power grid without connecting a transformer; and the comprehensive apparatus does not need to absorb active power from the power grid, instead, the comprehensive apparatus can supply energy to maintain the stability of the capacitor voltage, and can output active power to the power grid.

Description

A kind of modular multilevel comprehensive compensating device in conjunction with photovoltaic generation
Technical field
The present invention relates to circuit arrangement or the system of power supply or distribution, electric energy storage system field, particularly relates to a kind of modular multilevel comprehensive compensating device in conjunction with photovoltaic generation.
Background technology
Along with the sustainable development of China's power network, and the generation of electricity by new energy such as wind energy, solar energy is grid-connected, various power quality problem has been there is in electrical network, the idle power factor that causes reduces in a large number, the negative-sequence current that laod unbalance produces, non-linear element accesses harmonic current caused etc., and the requirement more and more higher to the quality of power supply of this and modern society runs in the opposite direction, and method must be taked to administer these power quality problems.
Meanwhile, although the current cost of electricity-generating of the generation of electricity by new energy such as wind energy, solar energy is still higher, among its cost is in and constantly declines, and due to its clean, reproducible feature, be in fast development.The new forms of energy that how to utilize with solar energy, wind energy be better representative are current important topics.
Current, many researchers have carried out some fruitful work for the research in this field, as patent documentation CN102013691A " a kind of Transformerless battery energy storing topological structure based on MMC modular multilevel inverter ", disclose a kind of Transformerless battery energy storing device based on MMC, carry out the unsteadiness of compensation network voltage.It has employed MMC structure equally, eliminates transformer at input; But the capacitor of its MMC submodule two ends parallel connection and the energy of batteries still need to obtain from electrical network, in this topology, capacitor and batteries exist as energy-storage module, if there is no the energy absorbed from electrical network during line voltage spike, so just cannot carry out energy feedback to electrical network when grid voltage sags and interruption, this is the limitation that this patent exists.
Summary of the invention
The object of the invention is to solve the problems of the technologies described above, a kind of modular multilevel comprehensive compensating device in conjunction with photovoltaic generation is provided, in conjunction with photovoltaic generation, by modular structural design, can as the paralleling compensating device of grid, idle, negative phase-sequence, harmonic wave and even meritorious comprehensive compensation are carried out to electrical network.
In order to above-mentioned purpose present invention employs following technical scheme: a kind of modular multilevel comprehensive compensating device in conjunction with photovoltaic generation, this compensation arrangement comprises three-phase, often comprise two brachium pontis mutually, each brachium pontis is by the multiple submodule and the brachium pontis inductance L that contain storage battery and photovoltaic power generation apparatus 1be in series, pass through inductance L 2and K switch parallel connection access electrical network.
Further, described each brachium pontis has n submodule, often have 2n submodule mutually, this compensation arrangement output level number is n+1, is the output of every phase between described two brachium pontis.
Further, described submodule is by two full-controlled switch device T 1and T 2be in series, then shunt capacitance C, described storage battery and photovoltaic power generation apparatus are connected in parallel on described electric capacity C two ends, described T 1and T 2anti-paralleled diode D respectively 1and D 2, described T 1, T 2common port, described electric capacity C and described T 2common port as the output of described submodule, be connected with other submodule.
Further, described full-controlled switch device T 1, T 2for IGBT, IGCT or MOSFET, its material is Si, SiC or GaN.
Workflow of the present invention:
This compensation arrangement is parallel three phase, each has upper and lower two brachium pontis mutually, each brachium pontis has n submodule, storage battery and photovoltaic power generation apparatus is parallel with in each submodule, it is the output point of this compensation arrangement between two brachium pontis, each brachium pontis is connected with output point through the brachium pontis inductance of series connection, and this compensation arrangement is connected with electrical network by three-phase output point, exports offset current to electrical network; Submodule containing storage battery and photovoltaic power generation apparatus, by two switching element T 1, T 2, an electric capacity C, a storage battery and a photovoltaic power generation apparatus composition, work as T 1conducting, T 2during shutoff, electric capacity C place in circuit, is in " input " state, and described submodule output voltage is V c, current i is submodule output current, is bridge arm current; And work as T 1turn off, T 2during conducting, electric capacity C is in " bypass " state, and submodule output voltage is 0; Photovoltaic power generation apparatus and storage battery can charge for electric capacity C, and by control switch device T 1, T 2break-make, can the access of control capacitance C and bypass; Owing to each brachium pontis there being n submodule, each has 2n submodule mutually, is modulated this compensation arrangement by certain modulation strategy, same mutually in, at any time, the shunt capacitance C in n submodule all can be had to be in " input " state, this compensation arrangement output level number is n+1; Because the level number exported is higher, lower switching frequency just can obtain desirable waveform quality, and switching loss is less, and the efficiency of compensation arrangement is also higher.By the electric energy that battery stores photovoltaic power generation apparatus sends, energy can be provided for compensation arrangement of the present invention, thus avoid the capacitance voltage landing because power electronic device loss causes, maintain the stable of busbar voltage; This compensation arrangement can not only carry out idle, negative phase-sequence, harmonic wave etc. compensation, due to photovoltaic power generation apparatus and storage battery, can also carry out meritorious compensation.
Control compensation arrangement of the present invention generation output current to comprise the following steps:
(1) to load current i la , i lb , i lc carry out abc-dq conversion, obtain active current i dref and reactive current i qref ;
(2) right i dref with i qref composition carry out analyzing and extracting, extract its fundamental active component, then the instantaneous reference value of this compensation arrangement output current can be obtained through dq-abc inverse transformation i ref ;
(3) will i ref with compensation arrangement output current instantaneous value ido difference, then obtain modulation signal through PI link;
(4) modulation signal and triangle wave are obtained pwm pulse, pwm pulse, as the drive singal of this compensation arrangement breaker in middle device, controls the output current of this compensation arrangement.
The invention has the beneficial effects as follows:
1. the structure of modular multilevel is adopted, there is the feature of high modularization, be convenient to design and assembling, shorten the design cycle, reduce cost, also be convenient to accident analysis and fault redundance protection simultaneously, can carry out very easily keeping in repair or improving capacitance grade by replacing or increasing submodule;
2. this compensation arrangement is formed by multiple sub module cascade, by certain modulation strategy, this compensation arrangement is modulated, n+1 level can be exported, output level number increases with the increase of number of modules, output voltage electric current is closely sinusoidal wave, does not generally need filter can meet the requirement of harmonic content.
Containing photovoltaic power generation apparatus and storage battery in each submodule of 3. this compensation arrangement, self can produce power, so, compared with other same devices, DC bus-bar voltage can not decline because of the reason of power electronic device own loss, device loss and the energy when compensation arrangement active power of output, provide by photovoltaic power generation apparatus and storage battery, meritorious without the need to absorbing from electrical network.
4. this compensation arrangement is connected in parallel in electrical network, can carry out the comprehensive compensation of reactive power, negative phase-sequence, harmonic wave to electrical network, and active power compensates.
5. have employed photovoltaic power generation apparatus in this compensation arrangement, there is cleanliness without any pollution, reproducible advantage.
Accompanying drawing explanation
Fig. 1 is a kind of modular multilevel comprehensive compensating device structure chart in conjunction with photovoltaic generation;
Fig. 2 is a kind of modular multilevel comprehensive compensating device sub modular structure figure in conjunction with photovoltaic generation.
Embodiment
The features and advantages of the invention can be understood further by reference to the accompanying drawings by following detailed description.The embodiment provided is only the explanation to the inventive method, and does not limit the present invention in any way all the other contents of announcement.
As shown in Figure 1, a kind of modular multilevel comprehensive compensating device in conjunction with photovoltaic generation, this compensation arrangement comprises three-phase, often comprises two brachium pontis mutually, and each brachium pontis is by the multiple submodule and the brachium pontis inductance L that contain storage battery and photovoltaic power generation apparatus 1be in series, pass through inductance L 2and K switch parallel connection access electrical network; Brachium pontis inductance L 1playing the effect suppressing circulation, is the output point of this each phase of compensation arrangement between upper and lower two brachium pontis inductance, as shown in a, b, c in Fig. 13; Be connected with electrical network by the output point of three-phase, export offset current to electrical network.
As shown in Figure 2, for a kind of in conjunction with the modular multilevel comprehensive compensating device sub modular structure figure of photovoltaic generation, in submodule, switching device is full-controlled switch device, and with anti-paralleled diode, in submodule, two full-controlled switch devices in series together; The common port of two full-controlled switch devices is the input of submodule, and full-controlled switch device is IGBT, IGCT or MOSFET, and its material is Si, SiC or GaN.In fig. 2, as T 1, T 2be IGBT, D 1, D 2for anti-paralleled diode, C is shunt capacitance, and storage battery and photovoltaic power generation apparatus are connected in parallel on electric capacity two ends, work as T 1conducting, T 2during shutoff, electric capacity C place in circuit, is in " input " state, and this submodule output voltage is v c , electric current ifor submodule output current, be bridge arm current; And work as T 1turn off, T 2during conducting, electric capacity C is in " bypass " state, and this submodule output voltage is 0.
Each brachium pontis of this compensation arrangement there is n submodule, each has 2n submodule mutually, by the stacked PWM strategy of phase inverted carrier, this compensation arrangement is modulated, same mutually in, at any time, capital has the shunt capacitance in n submodule to be in " input " state, and this compensation arrangement output level number is n+1; Or approach modulation strategy by nearest level to modulate compensation arrangement, any time, each submodule number being in " input " state was mutually n, and be the half of this facies unit whole submodule number 2n, the level number that this compensation arrangement exports is n+1.Because the level number exported is higher, lower switching frequency just can obtain desirable waveform quality, and switching loss is less, and the efficiency of compensation arrangement is also higher.
The electric energy that battery stores photovoltaic power generation apparatus in this compensation arrangement submodule sends, for compensation arrangement provides energy, avoids the capacitance voltage landing because loss causes, maintains the stable of busbar voltage; This compensation arrangement can not only carry out idle, negative phase-sequence, harmonic wave etc. compensation, and due to photovoltaic power generation apparatus, this compensation arrangement can also carry out meritorious compensation.
When this compensation arrangement compensates idle, negative phase-sequence, the harmonic component in electrical network, it is particularly important how control and compensation device produces output current.In conjunction with the control method of the modular multilevel comprehensive compensating device of photovoltaic generation, comprise the following steps:
First need the load current shown in Fig. 1 i la , i lb , i lc carry out abc-dq conversion, obtain active current instruction i dref and reactive current i qref , then according to the needs of Compensation Objectives, right i dref with i qref composition carry out analyzing and extracting, extract fundamental active component, then the instantaneous reference value of this compensation arrangement output current can be obtained through dq-abc inverse transformation i ref , will i ref with compensation arrangement output current instantaneous value ido difference, then obtain modulation signal through PI link, modulation signal can obtain pwm pulse with triangle wave again, and this pwm pulse is the switch element drive singal in compensation arrangement, thus the output current of control and compensation device, the compensate function needed for realization.
In sum, the present invention has power quality compensation function, carries out idle, negative phase-sequence, harmonic wave and even meritorious comprehensive compensation by output current to electrical network.Because the present invention adopts modular construction, without the need to connection transformer when this compensation arrangement is connected with electrical network, simultaneously due to photovoltaic power generation apparatus and storage battery in parallel in submodule, this compensation arrangement is meritorious without the need to absorbing from electrical network, energy self can be provided to maintain capacitance voltage stablize, and can to electrical network active power of output.

Claims (4)

1. in conjunction with a modular multilevel comprehensive compensating device for photovoltaic generation, it is characterized in that: this compensation arrangement comprises three-phase, often comprise two brachium pontis mutually, each brachium pontis is by the multiple submodule and the brachium pontis inductance L that contain storage battery and photovoltaic power generation apparatus 1be in series, pass through inductance L 2and K switch parallel connection access electrical network.
2. the modular multilevel comprehensive compensating device in conjunction with photovoltaic generation according to claim 1, it is characterized in that: described each brachium pontis has n submodule, often have 2n submodule mutually, this compensation arrangement output level number is n+1, is the output of every phase between described two brachium pontis.
3. the modular multilevel comprehensive compensating device in conjunction with photovoltaic generation according to claim 1, is characterized in that: described submodule is by two full-controlled switch device T 1and T 2be in series, then shunt capacitance C, described storage battery and photovoltaic power generation apparatus are connected in parallel on described electric capacity C two ends, described T 1and T 2anti-paralleled diode D respectively 1and D 2, described T 1, T 2common port, described electric capacity C and described T 2common port as the output of described submodule, be connected with other submodule.
4. the modular multilevel comprehensive compensating device in conjunction with photovoltaic generation according to claim 3, is characterized in that: described full-controlled switch device T 1, T 2for IGBT, IGCT or MOSFET, its material is Si, SiC or GaN.
CN201510765337.6A 2015-11-11 2015-11-11 A kind of modular multilevel comprehensive compensating device of combination photovoltaic power generation Active CN105375515B (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106877371A (en) * 2017-03-30 2017-06-20 上海交通大学 A kind of control method of the modular multi-level converter with energy-storage function
CN107834602A (en) * 2017-11-23 2018-03-23 兰州理工大学 A kind of micro- source half-bridge current transformer tandem type micro-grid system
CN109787269A (en) * 2017-11-13 2019-05-21 丰郅(上海)新能源科技有限公司 Photovoltaic module rapidly switches off the method for restarting after system and shutdown

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JP2023031439A (en) * 2021-08-25 2023-03-09 トヨタ自動車株式会社 Power supply system

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CN102111080A (en) * 2011-02-24 2011-06-29 广州智光电气股份有限公司 Photovoltaic grid-connected inverter and control method
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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106877371A (en) * 2017-03-30 2017-06-20 上海交通大学 A kind of control method of the modular multi-level converter with energy-storage function
CN106877371B (en) * 2017-03-30 2019-07-05 上海交通大学 A kind of control method of the modular multi-level converter with energy-storage function
CN109787269A (en) * 2017-11-13 2019-05-21 丰郅(上海)新能源科技有限公司 Photovoltaic module rapidly switches off the method for restarting after system and shutdown
CN107834602A (en) * 2017-11-23 2018-03-23 兰州理工大学 A kind of micro- source half-bridge current transformer tandem type micro-grid system
CN107834602B (en) * 2017-11-23 2021-05-18 兰州理工大学 Micro-grid system with micro-source half-bridge converter connected in series

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