CN104600725A - Photovoltaic series compensation system - Google Patents

Photovoltaic series compensation system Download PDF

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Publication number
CN104600725A
CN104600725A CN201310533488.XA CN201310533488A CN104600725A CN 104600725 A CN104600725 A CN 104600725A CN 201310533488 A CN201310533488 A CN 201310533488A CN 104600725 A CN104600725 A CN 104600725A
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China
Prior art keywords
inverter
voltage
energy storage
transformer
energy
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CN201310533488.XA
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Chinese (zh)
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CN104600725B (en
Inventor
马琳
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西门子公司
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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00Circuit arrangements for ac mains or ac distribution networks
    • H02J3/28Arrangements for balancing of the load in a network by storage of energy
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/381Dispersed generators
    • H02J3/382Dispersed generators the generators exploiting renewable energy
    • H02J3/383Solar energy, e.g. photovoltaic energy
    • H02J3/385Maximum power point tracking control for photovoltaic sources
    • Y02E10/563
    • Y02E10/566
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E70/00Other energy conversion or management systems reducing GHG emissions
    • Y02E70/30Systems combining energy storage with energy generation of non-fossil origin

Abstract

The invention provides a photovoltaic series compensation system. The system comprises a DC bus, a capacitor, an inverter, a transformer, a filter, an AC energy storing system and an energy storing control device; one end of the primary side of the transformer is electrically connected with the output end of the inverter; the filter is equipped with an input end which forms a continuous current circuit with the primary side of the transformer and the output end of the inverter, and an output end which is connected in parallel to a power grid; the AC energy storing system comprises an energy storing device and an energy storing conversion device; the energy storing control device is used for detecting voltage and current in the DC bus; when the voltage of the DC bus is more than a preset upper limit value or less than a preset lower limit value, the energy storing control device controls the energy storing conversion device to charge or discharge the energy storing device according to the voltage and current in the DC bus so as to provide dynamic compensation voltage to the output voltage of the inverter, and therefore, a photovoltaic generating device can work at the maximum power point. With the adoption of the photovoltaic series compensation system, the maximum power point range can be expanded, and meanwhile, the grid voltage compensation and energy storage functions can be achieved.

Description

Photovoltaic series compensation system

Technical field

The present invention relates to field of photovoltaic power generation, be specifically related to a kind of photovoltaic series compensation system.

Background technology

In solar grid-connected electricity generation system, how to increase the power output of solar cell, make full use of solar energy, the generating efficiency improving whole solar grid-connected electricity generation system has great importance.

By the research to solar cell characteristics of output power, find solar cell power output and the relating to parameters such as intensity of illumination and ambient temperature, work near peak power output point to make grid-connected photovoltaic system, the MPPT maximum power point tracking (MPPT) that current employing is more, by changing the output voltage of solar cell, thus realize solar cell maximum power output.

In Chinese patent application publication No. CN102723740A, disclose a kind of photovoltaic DC-to-AC converter and control method, adopt the MPPT control strategy in this patent application can follow the tracks of the violent photoenvironment of change fast, improve the power output of solar cell.

In current grid-connected photovoltaic system, if the maximum power point of this grid-connected photovoltaic system (MPP) scope is 450 volt of-1000 volt, if environmental change that is regional at certain or certain time period is larger on the one hand, make the maximum power point of photovoltaic cell 400 volts (namely lower than the lower limit of maximum power point range), inverter now in grid-connected photovoltaic system cannot work, thus can not the electric energy that photovoltaic cell produces be exported in electrical network, this part solar energy can only be wasted, and causes the utilization ratio of solar energy to reduce.On the other hand when the output voltage of photovoltaic cell is 450 volts, if the line voltage effective value of the alternating current of the output of inverter is under maximum percentage modulation be approximately 180 volts, in order to provide the power output of 500kW to the stabilization of power grids, now AC phase currents effective value will reach 910 peaces, therefore must select to bear electric current and pacify above semiconductor switch pipe 910, this electric current greatly wasting switching tube selects capacity.Simultaneously, the restriction of photovoltaic panel open circuit voltage, makes again the voltage of semiconductor switch pipe must reach the highest voltage of photovoltaic panel, supposes that maximum power point range is 450V-1000V, then switching device voltage should be not less than 1000V, but practical devices is chosen as nominal 1700V.The voltage greatly wasting switching tube selects capacity.Therefore the problems such as the delivery efficiency of solar cell and utilance are not fundamentally solved at present.

Summary of the invention

For above-mentioned prior art, the present invention aims to provide a kind of photovoltaic series compensation system, comprising:

DC bus, comprises positive terminal and negative terminal, and described positive terminal and negative terminal are used for being electrically connected with the output of photovoltaic power generation apparatus;

Electric capacity, described electric capacity is connected electrically between described positive terminal and negative terminal;

Inverter, the input of described inverter is electrically connected between described positive terminal and negative terminal;

Transformer, described transformer has primary side and secondary side, and one end of the primary side of described transformer is electrically connected with the output of described inverter;

Filter, described filter has the input forming continuous current circuit with the output of the primary side of described transformer and described inverter and the output be connected in parallel on electrical network;

Exchange energy-storage system, described interchange energy-storage system comprises energy storage device and energy storage converting means, and described energy storage device is connected to the secondary side of described transformer by described energy storage converting means;

Energy storage control device, described energy storage control device is for detecting the voltage and current on described DC bus, when the voltage on described DC bus is higher than predetermined higher limit, described energy storage control device controls described energy storage converting means according to the voltage and current on described DC bus and charges to described energy storage device, thus provide dynamic compensation voltage for the output voltage of described inverter, make described photovoltaic power generation apparatus in maximum power point work, when the voltage on described DC bus is lower than predetermined lower limit, described energy storage control device controls described energy storage converting means according to the voltage and current on described DC bus and discharges to described energy storage device, thus provide dynamic compensation voltage for the output voltage of described inverter, make described photovoltaic power generation apparatus in maximum power point work.

Photovoltaic series compensation system of the present invention improves the maximum power point range of photovoltaic power generation apparatus, makes the maximum power point range of photovoltaic power generation apparatus from being greater than zero to the open circuit voltage of photovoltaic power generation apparatus in theory.There is compensation of line voltage and solve low voltage ride-through capability problem, there is energy-storage function simultaneously.Improve the utilance of solar energy.

Preferably, described energy storage control device controls described inverter at most effective modulation degree operated within range.The utilance of semiconductor switch device in inverter can be improved.

Preferably, when the voltage on described DC bus is higher than predetermined higher limit, described energy storage control device works under controlling first modulation degree of described inverter within the scope of described most effective modulation degree; And when the voltage on described DC bus is lower than predetermined lower limit, described energy storage control device works under controlling second modulation degree of described inverter within the scope of described most effective modulation degree, described first modulation degree and described second modulation degree unequal.Preferred, described first modulation degree is the lower limit within the scope of most effective modulation degree, and described second modulation degree is the higher limit within the scope of most effective modulation degree.The higher limit of inverter within the scope of most effective modulation degree or lower limit work, can effectively reduce dynamic compensation magnitude of voltage, reduces the loss of semiconductor switch device in inverter.

Preferably, described inverter is full-bridge inverter, comprises three brachium pontis be connected in parallel between described positive terminal and negative terminal, and described full-bridge inverter has first node, Section Point and the 3rd node; Described transformer comprises three-phase; ; Described interchange energy-storage system is three-phase alternating current energy-storage system.There is provided three-phase alternating current by three-phase transformer and three-phase alternating current energy-storage system to electrical network, meet civil power demand.

Preferred, described filter is three-phase LCL filter.The cost of LCL filter is low, good wave filtering effect.

Preferably, described inverter is two leg inverters, and described two leg inverters have the 4th node and the 5th node; Described transformer is single-phase transformer, and one end of the primary side of described single-phase transformer is electrically connected with described 4th node; Described interchange energy-storage system is single phase alternating current (A.C.) energy-storage system.This embodiment is used for providing single-phase alternating current to electrical network.

Preferred, described filter is single-phase LCL filter.The cost of LCL filter is low, good wave filtering effect.

Preferably, the output of described filter is connected with the primary side of the transformer in described electrical network.

Accompanying drawing explanation

The following drawings is only intended to schematically illustrate the present invention and explain, not delimit the scope of the invention.Wherein,

Fig. 1 is the circuit diagram of the photovoltaic series compensation system according to first embodiment of the invention;

Fig. 2 is the circuit diagram of the photovoltaic series compensation system according to second embodiment of the invention.

Main device symbol description

1 positive terminal 2 negative terminal

3 inverters 4 exchange energy-storage system

41 energy storage device 42 energy storage control devices

5 three-phase transformer 23 inverters

24 exchange energy-storage system 25 LCL filter

26 alternating electromagnetic compatible filters 27 transformers

28 energy storage control device 29 energy storage devices

43 energy storage converting means 20 energy storage converting means

C1-C5 electric capacity

T1-T10 insulated gate bipolar transistor

Tr1-Tr4 transformer

L1, L2 inductance

Embodiment

In order to there be understanding clearly to technical characteristic of the present invention, object and effect, now contrast accompanying drawing and the specific embodiment of the present invention is described.

Fig. 1 is the circuit diagram of the photovoltaic series compensation system according to first embodiment of the invention.As shown in Figure 1, this photovoltaic series compensation system comprise the positive terminal 1 of DC bus with negative terminal 2, electric capacity C1, inverter 3, transformer U phase Tr1, transformer V phase Tr2, transformer W phase Tr3, filter capacitor C2, filter capacitor C3, filter capacitor C4, exchange energy-storage system 4 and energy storage control device 42.Positive terminal 1 and negative terminal 2 are used for being connected the output of photovoltaic power generation apparatus (not shown), two terminals of electric capacity C1 are connected on positive terminal 1 and negative terminal 2 respectively, and photovoltaic power generation apparatus exports on electric capacity C1 after the solar energy of acquisition is converted to direct current.Inverter 3 is full-bridge inverter also other forms of photovoltaic DC-to-AC converters, as multi-electrical level inverter etc., wherein, full-bridge inverter comprises three brachium pontis be connected in parallel between positive terminal 1 and negative terminal 2, wherein each brachium pontis has two insulated gate bipolar transistors of series connection.First brachium pontis has insulated gate bipolar transistor T1 and insulated gate bipolar transistor T2, wherein between insulated gate bipolar transistor T1 and insulated gate bipolar transistor T2, there is node N1.Second brachium pontis has insulated gate bipolar transistor T3 and insulated gate bipolar transistor T4, wherein between insulated gate bipolar transistor T3 and insulated gate bipolar transistor T4, there is node N2.3rd brachium pontis has insulated gate bipolar transistor T5 and insulated gate bipolar transistor T6, wherein between insulated gate bipolar transistor T5 and insulated gate bipolar transistor T6, there is node N3.In the present embodiment, direct current on electric capacity C1 can be converted to alternating current by control method of the prior art and export by inverter 3, and make each angle of conducting electricity mutually of three-phase electricity differ 120 °, positive terminal 1 and negative terminal 2 are the input of inverter 3, and node N1, node N2 and node N3 are the output of inverter 3.In other examples, can also the insulated gate bipolar transistor in the present embodiment be replaced to form full-bridge inverter by metal-oxide half field effect transistor.The primary side of transformer U phase Tr1 has terminal U1 and terminal U2, and terminal U1 is connected with node N1.The primary side of transformer V phase Tr2 has terminal V1 and terminal V2, and terminal V1 and node N2 is electrically connected.The primary side of transformer W phase Tr3 has terminal W1 and terminal W2, and terminal W1 is connected with node N3.Wherein transformer U phase Tr1, transformer V phase Tr2 and transformer W phase Tr3 secondary side with exchange energy-storage system 4 and be electrically connected, in the present embodiment, exchange energy-storage system 4 and mainly comprise energy storage device 41 and energy storage converting means 43, one end of energy storage converting means 43 is connected with the secondary side of the three-phase Tr1-Tr3 of transformer, the other end of energy storage converting means 43 is connected with energy storage device 41, in an embodiment of the present invention, energy storage converting means 43 can comprise AC-dc converter and DC to DC converter, for controlling energy storage device 41 charge or discharge.The voltage of energy storage control device 42 on Detection capacitance C1 and the electric current in DC bus, and according to the modulation degree of the voltage control inverter 3 on electric capacity C1, make inverter 3 at most effective modulation degree operated within range, energy storage control device 42 can also provide dynamic compensation voltage according to the voltage on electric capacity C1 and the electric current in DC bus to the output of inverter 3 simultaneously, make photovoltaic power generation apparatus in the work of peak power point, in other embodiments of the invention, the power that energy storage control device 42 can also export according to photovoltaic power generation apparatus provides dynamic compensation voltage to the output of inverter 3, make photovoltaic power generation apparatus in the work of peak power point.Electric capacity C2, electric capacity C3 and electric capacity C4 connection triangular in shape, namely electric capacity C2, electric capacity C3 are connected in the form of a ring with electric capacity C4.Electric capacity C2 is connected with the terminal U2 of the primary side of transformer U phase Tr1 with the node of electric capacity C4, electric capacity C2 is connected with the terminal V2 of the primary side of transformer V phase Tr2 with the node of electric capacity C3, the node of electric capacity C3 with C4 is connected with the terminal W2 of the primary side of transformer W phase Tr3, the terminal U2 of primary side, the terminal V2 of the primary side of transformer V phase Tr2 of transformer U phase Tr1 and the terminal W2 of the primary side of transformer W phase Tr3 are connected to the input of three-phase transformer 5 simultaneously, and the output of three-phase transformer 5 is connected with electrical network.Because the transformer of reality all more or less has leakage inductance, therefore in the present embodiment, the electric capacity C2 that transformer Tr1, transformer Tr2, transformer Tr3 and the leakage inductance in three-phase transformer 5 are connected with triangle, electric capacity C3 and electric capacity C4 constitute three-phase LCL filter, decrease components and parts, reduce costs.

Light energy conversion is electric energy by photovoltaic power generation apparatus (such as photovoltaic cell component), by the positive terminal 1 of DC bus and negative terminal 2 by electrical power storage on electric capacity C1, energy storage control device 42 detects the voltage on DC bus and the electric current in DC bus, when voltage between the positive terminal 1 and negative terminal 2 of DC bus is between predetermined lower limit and higher limit, now exchange energy-storage system 4 and do not provide voltage compensation, namely energy storage device 41 does not carry out any charge and discharge process, energy storage control device 42 is photovoltaic DC-to-AC converter control mode control inverter 3 traditionally, and make inverter 3 at most effective modulation degree operated within range, thus make photovoltaic cell component be operated in maximum power point, the electric energy that now photovoltaic cell component produces can directly export in electrical network.Wherein in this photovoltaic series compensation system, the scope of predetermined higher limit and the lower limit modulation index when most effective according to line voltage and inverter 3 is determined.

When voltage between the positive terminal 1 and negative terminal 2 of DC bus is greater than predetermined higher limit, now the power output of photovoltaic cell component also can correspondingly increase, energy storage control device 42 control inverter 3 works under most effective a certain fixed modulation degree, such as make the lower limit work of inverter 3 within the scope of most effective modulation degree, and the Injection Current vector dynamic compensation voltage vector that is injected in electrical network is controlled by vector control method, make the direction of Injection Current vector dynamic compensation voltage vector contrary simultaneously, now energy storage control device 42 makes energy storage device 41 charging energy-storing by controlling energy storage converting means 43, the charged state that energy storage control device 42 controls energy storage device 41 according to the voltage and current on DC bus provides a dynamic compensation voltage to the output of inverter 3, thus make photovoltaic cell component be operated in maximum power point.

When voltage between the positive terminal 1 and negative terminal 2 of DC bus is less than predetermined lower limit, now the power output of photovoltaic cell component also can correspondingly reduce.Energy storage control device 42 control inverter 3 works under most effective a certain fixed modulation degree, such as make the higher limit work of inverter 3 within the scope of most effective modulation degree, and provide a dynamic compensation voltage vector by vector control method control interchange energy-storage system 4, this dynamic compensation voltage vector and the current phasor be injected in electrical network are in the same way, now energy storage control device 42 makes energy storage device 41 start electric discharge by controlling energy storage converting means 43, the discharge condition that energy storage control device 42 controls energy storage device 41 according to the voltage and current on DC bus provides a dynamic compensation voltage to the output of inverter 3, thus make photovoltaic cell component be operated in maximum power point.

Compared to the prior art in background technology, when the output voltage of the photovoltaic cell component in the present invention is very low or far below needed for grid-connected inverters during direct voltage, now inverter still can normally work, and make photovoltaic cell component be operated in maximum power point, thus this part Solar use is got up and exports in electrical network.Therefore, photovoltaic series compensation system of the present invention makes the maximum power point range of photovoltaic power generation apparatus (or photovoltaic cell component) in theory from 0 volt to the open circuit voltage of photovoltaic power generation apparatus.Simultaneously, the maximum working voltage of the insulated gate bipolar transistor of the inverter in the present invention and maximum operating currenbt all can reduce, devices use rate improves, and need not select insulated gate bipolar transistor or other semiconductor switch pipes that can bear more big current, which decrease equipment cost.In addition, photovoltaic series compensation system of the present invention has compensation of line voltage and energy-storage function, solves the problem of low voltage crossing and grid-connected energy storage simultaneously.

Fig. 2 is the circuit diagram of the photovoltaic series compensation system according to second embodiment of the invention.As shown in Figure 2, this photovoltaic series compensation system comprise the positive terminal 1 of DC bus with negative terminal 2, electric capacity C1, inverter 23, transformer Tr4, energy storage control device 28, exchange energy-storage system 24 and LCL filter 25.Wherein inverter 23 is two leg inverters, comprises two brachium pontis be connected in parallel between positive terminal 1 and negative terminal 2, each brachium pontis has two insulated gate bipolar transistors of series connection.First brachium pontis has insulated gate bipolar transistor T7 and insulated gate bipolar transistor T8, wherein between insulated gate bipolar transistor T7 and insulated gate bipolar transistor T8, there is node N4.Second brachium pontis has insulated gate bipolar transistor T9 and insulated gate bipolar transistor T10, wherein between insulated gate bipolar transistor T9 and insulated gate bipolar transistor T10, there is node N5.The primary side of transformer Tr4 has terminal 21 and terminal 22, terminal 21 is connected with node N4, the secondary side of transformer Tr4 is connected with and exchanges energy-storage system 24, exchange energy-storage system 24 and comprise energy storage device 29 and energy storage converting means 20, energy storage device 29 is connected to the secondary side of transformer Tr4 by energy storage converting means 20.One end of one of them filter inductance L1 of LCL filter is connected with terminal 22, and one end of filter capacitor C5 is connected with node N5, and one end of one end of filter inductance L1 and filter capacitor C5 is as input, and constitutes the continuous current circuit of transformer Tr4.One end of filter inductance L2, as the output of LCL filter, is connected with the transformer 27 of electrical network side by alternating electromagnetic compatible filters 26, thus provides power stage to electrical network.In first embodiment, also can be connected with alternating electromagnetic compatible filters between filter and the input of three-phase transformer 5.The photovoltaic series compensation system of the present embodiment can when the output voltage of photovoltaic cell component be lower than predetermined lower limit, also inverter 23 can be made to work, thus the solar energy that photovoltaic cell component produces is exported in electrical network, its operation principle is identical with in Fig. 1, does not repeat them here.

In the above embodiment of the present invention, direct solenoid Compatibility filter can also be connected on positive terminal 1 and negative terminal 2.In other embodiments of the invention, inverter is not limited to the full-bridge inverter 3 shown in Fig. 1 and two leg inverters 23 shown in Fig. 2, can also be other by the inverter of converting direct-current power into alternating-current power.Filter 25 in the present invention can be LCL filter, and two filter inductances wherein in LCL filter can be the leakage inductances of using in transformer, namely uses the leakage inductance composition LCL filter in transformer as shown in Figure 1, thus reduces components and parts and cost.In the filter shown in Fig. 1, electric capacity C2, electric capacity C3 and electric capacity C4 can also be Y-connections.In other examples, filter can also be LC filter.

Be to be understood that, although this specification describes according to each embodiment, but not each embodiment only comprises an independently technical scheme, this narrating mode of specification is only for clarity sake, those skilled in the art should by specification integrally, technical scheme in each embodiment also through appropriately combined, can form other execution modes that it will be appreciated by those skilled in the art that.

The foregoing is only the schematic embodiment of the present invention, and be not used to limit scope of the present invention.Any those skilled in the art, the equivalent variations done under the prerequisite not departing from design of the present invention and principle, amendment and combination, all should belong to the scope of protection of the invention.

Claims (8)

1. a photovoltaic series compensation system, is characterized in that, comprising:
DC bus, comprises positive terminal and negative terminal, and described positive terminal and negative terminal are used for being electrically connected with the output of photovoltaic power generation apparatus;
Electric capacity, described electric capacity is connected electrically between described positive terminal and negative terminal;
Inverter, the input of described inverter is electrically connected between described positive terminal and negative terminal;
Transformer, described transformer has primary side and secondary side, and one end of the primary side of described transformer is electrically connected with the output of described inverter;
Filter, described filter has the input forming continuous current circuit with the output of the primary side of described transformer and described inverter and the output be connected in parallel on electrical network;
Exchange energy-storage system, described interchange energy-storage system comprises energy storage device and energy storage converting means, and described energy storage device is connected to the secondary side of described transformer by described energy storage converting means;
Energy storage control device, described energy storage control device is for detecting the voltage and current on described DC bus, when the voltage on described DC bus is higher than predetermined higher limit, described energy storage control device controls described energy storage converting means according to the voltage and current on described DC bus and charges to described energy storage device, thus provide dynamic compensation voltage for the output voltage of described inverter, make described photovoltaic power generation apparatus in maximum power point work, when the voltage on described DC bus is lower than predetermined lower limit, described energy storage control device controls described energy storage converting means according to the voltage and current on described DC bus and discharges to described energy storage device, thus provide dynamic compensation voltage for the output voltage of described inverter, make described photovoltaic power generation apparatus in maximum power point work.
2. photovoltaic series compensation system according to claim 1, is characterized in that, described energy storage control device controls described inverter at most effective modulation degree operated within range.
3. photovoltaic series compensation system according to claim 2, is characterized in that,
When the voltage on described DC bus is higher than predetermined higher limit, described energy storage control device works under controlling first modulation degree of described inverter within the scope of described most effective modulation degree; And
When the voltage on described DC bus is lower than predetermined lower limit, described energy storage control device works under controlling second modulation degree of described inverter within the scope of described most effective modulation degree, described first modulation degree and described second modulation degree unequal.
4. photovoltaic series compensation system according to claim 3, is characterized in that, described first modulation degree is the lower limit within the scope of described most effective modulation degree, and described second modulation degree is the higher limit within the scope of described most effective modulation degree.
5. the photovoltaic series compensation system according to any one of Claims 1-4, is characterized in that,
Described inverter is full-bridge inverter, comprises three brachium pontis be connected in parallel between described positive terminal and negative terminal, and described full-bridge inverter has first node, Section Point and the 3rd node; With
Described interchange energy-storage system is three-phase alternating current energy-storage system.
6. photovoltaic series compensation system according to claim 5, is characterized in that, described filter is three-phase LCL filter.
7. the photovoltaic series compensation system according to any one of Claims 1-4, is characterized in that,
Described inverter is two leg inverters, and described two leg inverters have the 4th node and the 5th node;
Described transformer is single-phase transformer, and one end of the primary side of described single-phase transformer is electrically connected with described 4th node;
Described interchange energy-storage system is single phase alternating current (A.C.) energy-storage system.
8. photovoltaic series compensation system according to claim 7, is characterized in that, described filter is single-phase LCL filter.
CN201310533488.XA 2013-10-31 2013-10-31 photovoltaic series compensation system CN104600725B (en)

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US7830687B2 (en) * 2006-07-13 2010-11-09 Florida State University Research Foundation, Inc. Adaptive power electronics interface for hybrid energy systems
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