CN103138636B - A kind of photovoltaic is from grid-connected and energy storage mixed power supply system - Google Patents
A kind of photovoltaic is from grid-connected and energy storage mixed power supply system Download PDFInfo
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- CN103138636B CN103138636B CN201110385455.6A CN201110385455A CN103138636B CN 103138636 B CN103138636 B CN 103138636B CN 201110385455 A CN201110385455 A CN 201110385455A CN 103138636 B CN103138636 B CN 103138636B
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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
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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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
- 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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Abstract
The invention provides a kind of photovoltaic from grid-connected and energy storage mixed power supply system, comprising: city's net, photovoltaic power supply source, photovoltaic bimodulus inverter, energy-storage battery, the two-way bimodulus inverter of energy storage, user load and absorbing load.Wherein, city's net is used for powering to user load, to energy-storage battery charging, and the electric energy of carrying photovoltaic feedback net; After photovoltaic power supply source is connected with photovoltaic bimodulus inverter, for powering to user load, photovoltaic synchronization feeding, and energy-storage battery is charged; After energy-storage battery is connected with the two-way bimodulus inverter of energy storage, for powering to user load, and the grid-connected feed of energy storage; Absorbing load is connected with photovoltaic power supply source, to power and to the dump power after energy-storage battery charging for consuming photovoltaic power supply source to user load.The excellent inverse gesture that this mixed power supply system is conducive to realizing photovoltaic off-grid and grid-connected power supply is complementary.
Description
Technical field
The present invention relates to photovoltaic power supply field, particularly a kind of low profile photovoltaic of family expenses is from grid-connected and energy storage mixed power supply system.
Background technology
Two kinds of forms are mainly contained on the market at present: (one) grid-connected power supply: the electric energy that photovoltaic power supply source produces net through combining inverter and city that to merge be jointly load supplying towards the photovoltaic power supply product of home unit; (2) from net power supply: electric energy and city that photovoltaic power supply source produces net that to isolate independence be load supplying.No matter be grid-connected or from net, all need the energy storage configuring certain capacity, to ensure power supply quality, and guarantee to make full use of the electric energy that photovoltaic produces.
The feature of grid-connected power supply is, photovoltaic electric energy and city net and access same bus, is load supplying simultaneously.If photovoltaic electric energy exceedes bearing power, more than photovoltaic electric energy oppositely present net; If photovoltaic electric can meet bearing power, city's net also flows supplementary.Therefore the advantage of grid-connected powering mode is, the constraints of system is few, and flexibility is large.But its major defect is: under grid-connected powering mode, combining inverter determines its output voltage amplitude and phase place based on urban network electricity pressure, namely photovoltaic power supply is limited by the power supply state of city's net, once city's net power down, combining inverter just loses basis of reference, and therefore grid-connected power supply can not run under island mode.And when city's net power down, require that combining inverter has real-time detectability, and immediately quit work, be fed to city's net with the electric current avoiding photovoltaic power supply source to produce, namely require that there is isolated island effect prevention.
Advantage from net power supply can independently provide output voltage benchmark from net inverter, is not limited by the power supply state of city's net, can runs under island mode.But its major defect is: the coupling of each link of system requires high, the very flexible of reply load variations.
Therefore, one is needed both can to run under island mode, the photovoltaic mixed power supply system that can be incorporated into the power networks again.
Summary of the invention
Object of the present invention is intended at least to solve one of technical problem existed in prior art, and particularly propose one and both can run under island mode, the photovoltaic that can be incorporated into the power networks again is from grid-connected and energy storage mixed power supply system.
For achieving the above object, the invention provides a kind of photovoltaic from grid-connected and energy storage mixed power supply system, comprising: city's net, photovoltaic power supply source, photovoltaic bimodulus inverter, energy-storage battery, the two-way bimodulus inverter of energy storage, user load and absorbing load.Wherein: described city net is used for powering to described user load, charges, and carry the feedback net electric energy in described photovoltaic power supply source to described energy-storage battery; After described photovoltaic power supply source is connected with described photovoltaic bimodulus inverter, for powering to described user load, described energy-storage battery is charged, and to described city net feed, wherein, described photovoltaic bimodulus inverter is used for following described urban network electricity pressure or Self-tuning System output voltage; After described energy-storage battery is connected with the two-way bimodulus inverter of described energy storage, for storing the electric energy from photovoltaic power supply source or civil power, and described user load is powered, wherein, described energy storage two-way bimodulus inverter inverter output voltage follows described urban network electricity pressure or Self-tuning System output voltage is powered to described user load, and described energy storage two-way bimodulus inverter works in rectification square to the charging to control described energy-storage battery; Described absorbing load is connected with described photovoltaic power supply source, to power and to remaining electric energy after described energy-storage battery charging for consuming described photovoltaic power supply source to described user load.
In embodiments of the present invention, described photovoltaic can carry at grid-connected and band from grid-connected and energy storage mixed power supply system, grid-connected, band carry, charging and feedback net, grid-connected, band carries, feedback net and charging, and the grid-connected and band of energy-storage battery carries, and city's guipure carries, city's guipure carries and charges, photovoltaic off-grid, energy-storage battery grid-connected and band carry, photovoltaic off-grid, band carry, charging and absorb, energy-storage battery carries nine kinds of MODE of operation from guipure.Wherein, band described in the embodiment of the present invention carries and refers to as load supplying.
Pattern is carried for grid-connected and band, when described user load power be less than the power in described photovoltaic power supply source and described energy-storage battery through judging without the need to charging time, described photovoltaic power supply source independently powers for described user load, dump energy is fed to described city net simultaneously, to ensure the electric energy that described user load utilizes photo-voltaic power supply to greatest extent and produces, that is consume the electric energy of described city net as few as possible.Wherein said photovoltaic bimodulus inverter output voltage follows described urban network electricity pressure, and the two-way bimodulus inverter of described energy storage is in cut-off state.
For grid-connected, band carries, charging and feedback net pattern, when described user load power is less than the power in described photovoltaic power supply source and described energy-storage battery need preferentially charge through judgement, described photovoltaic power supply source is independently for described user load is powered and be the charging of described energy-storage battery, then dump energy is fed to described city net, to ensure the electric energy that described user load utilizes photo-voltaic power supply to greatest extent and produces, that is consume the electric energy of described city net as few as possible.Wherein said photovoltaic bimodulus inverter output voltage follows described urban network electricity pressure, and the two-way bimodulus inverter of described energy storage is in rectification square to charged state.
For grid-connected, band carries, feedback net and charge mode, when described user load power is less than the power in described photovoltaic power supply source and described city net needs preferential feed through judgement, described photovoltaic power supply source is independently for described user load is powered and to described city net feed, then dump energy is the charging of described energy-storage battery, described urban network electricity pressure output voltage followed by wherein said photovoltaic bimodulus inverter, and the two-way bimodulus inverter of described energy storage is in rectification charging state.
Grid-connected and the band year pattern for energy-storage battery, when the cut-off power supply of described photovoltaic power supply source, described city net has electricity, and described energy-storage battery is when judgement allows electric discharge, described energy-storage battery is independently powered for described user load, and the part electric energy simultaneously stored is to described city net feed, and the two-way bimodulus inverter of wherein said energy storage is in inversion discharge condition, output voltage follows urban network electricity pressure, and described photovoltaic bimodulus inverter is in cut-off state.
Pattern is carried for city's guipure, when the cut-off power supply of described photovoltaic power supply source, city's net has electricity, and described energy-storage battery is when judgement does not allow electric discharge, described city net is independent powers for described user load, and wherein said photovoltaic bimodulus inverter and the two-way inverter of energy storage bimodulus are in cut-off state.
City's guipure is carried and charge mode, when the cut-off power supply of described photovoltaic power supply source, city's net has electricity, and described energy-storage battery is when judgement needs charging, described city net is independent powers for described user load and charges for described energy-storage battery, the two-way bimodulus inverter of wherein said energy storage works in rectification square to charged state, and described photovoltaic bimodulus inverter is in cut-off state.
For photovoltaic off-grid, energy-storage battery is grid-connected and be with the pattern of carrying, when described photovoltaic power supply source can power, the net power-off of described city, described user load power is greater than described photovoltaic power supply source power, and described energy-storage battery is when judgement allows electric discharge, described photovoltaic power supply source and energy-storage battery is grid-connected jointly powers for described user load, wherein said photovoltaic bimodulus inverter Self-tuning System ac output voltage, the two-way bimodulus inverter of described energy storage is in inversion direction discharge condition, and output voltage follows the output voltage of described photovoltaic bimodulus inverter.
Photovoltaic off-grid, band are carried, charged and absorption mode, when described photovoltaic power supply source can power, the net power-off of described city, described user load power is less than described photovoltaic power supply source power, and described energy-storage battery is when judgement needs charging, described photovoltaic power supply source powers for described user load separately, dump energy is preferably the charging of described energy-storage battery, then dump energy is also had to be absorbed by described absorbing load, wherein said photovoltaic bimodulus inverter Self-tuning System ac output voltage, the two-way inverter of described energy storage bimodulus is in rectification square to charged state.
From guipure, pattern is carried for energy-storage battery, when the cut-off power supply of described photovoltaic power supply source, the net power-off of described city, when described energy-storage battery is through judging to discharge, independently powered for described user load by described energy-storage battery, wherein said photovoltaic bimodulus inverter is in cut-off state, and the two-way inverter of described energy storage bimodulus is in inversion direction discharge condition, Self-tuning System output voltage.
In embodiments of the present invention, described photovoltaic also comprises central controller from grid-connected and energy storage mixed power supply system, each building block above-mentioned of described central controller and described electric power system sets up communication, the status signal of each building block described in Real-time Collection, and judge according to real time status information and control the current operation mode of described electric power system, namely by judging the current state of each building block of described electric power system, thus determine and control described electric power system to run on appropriate mode of operation.
The invention provides a kind of photovoltaic of applicable family expenses from grid-connected and energy storage mixed power supply system, have during by arranging grid-connected and follow the tracks of urban network electricity pressure energy power, from photovoltaic bimodulus inverter and the energy storage two-way bimodulus inverter during net with Self-tuning System output voltage capability, photovoltaic off-grid and grid-connected power supply are incorporated in same electric power system, complementary with the excellent inverse gesture realizing photovoltaic off-grid and grid-connected power supply, be conducive to the optimal design of photovoltaic power supply system.
The aspect that the present invention adds and advantage will part provide in the following description, and part will become obvious from the following description, or be recognized by practice of the present invention.
Accompanying drawing explanation
The present invention above-mentioned and/or additional aspect and advantage will become obvious and easy understand from the following description of the accompanying drawings of embodiments, wherein:
The photovoltaic that Fig. 1 provides for the embodiment of the present invention is from configuration diagram that is grid-connected and energy storage mixed power supply system;
Fig. 2 is the electrical schematic diagram of the photovoltaic bimodulus inverter of the embodiment of the present invention;
Fig. 3 is the electrical schematic diagram of the two-way bimodulus inverter of energy storage of the embodiment of the present invention;
Fig. 4 is the system schematic that the grid-connected of the embodiment of the present invention and band carry pattern;
Fig. 5 is that grid-connected, the band of the embodiment of the present invention carries, the system schematic of charging and feedback net pattern;
Fig. 6 is that grid-connected, the band of the embodiment of the present invention carries, feedback net and the system schematic of charge mode;
Fig. 7 is that the grid-connected and band of the energy-storage battery of the embodiment of the present invention carries the system schematic of pattern;
Fig. 8 is the system schematic that city's guipure of the embodiment of the present invention carries pattern;
Fig. 9 is that city's guipure of the embodiment of the present invention carries and the system schematic of charge mode;
Figure 10 is the photovoltaic off-grid of the embodiment of the present invention, energy-storage battery is grid-connected and band carries the system schematic of pattern;
Figure 11 is the photovoltaic off-grid of the embodiment of the present invention, band carries, charging and the system schematic of absorption mode;
Figure 12 is the system schematic of energy-storage battery from net powering mode of the embodiment of the present invention.
Embodiment
Be described below in detail embodiments of the invention, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has element that is identical or similar functions from start to finish.Being exemplary below by the embodiment be described with reference to the drawings, only for explaining the present invention, and can not limitation of the present invention being interpreted as.
In the description of this specification, specific features, structure, material or feature that the description of reference term " embodiment ", " some embodiments ", " example ", " concrete example " or " some examples " etc. means to describe in conjunction with this embodiment or example are contained at least one embodiment of the present invention or example.In this manual, identical embodiment or example are not necessarily referred to the schematic representation of above-mentioned term.And the specific features of description, structure, material or feature can combine in an appropriate manner in any one or more embodiment or example.
Figure 1 shows that photovoltaic that the embodiment of the present invention provides is from configuration diagram that is grid-connected and energy storage mixed power supply system.As shown in Figure 1, the photovoltaic of the embodiment of the present invention comprises from grid-connected and energy storage mixed power supply system: city's net 100, photovoltaic power supply source 200, photovoltaic bimodulus inverter 300, energy-storage battery 400, the two-way bimodulus inverter 500 of energy storage, user load 600 and absorbing load 700.This mixed power supply system comprises three power supply branch roads: civil power branch road, photovoltaic branch road and energy storage branch road, and two load branch: user load branch road and absorbing load branch road, all five branch roads are communicated with AC (interchange) bus respectively by electric switch (such as electric switch K1, K2, K3, K4 and K5).
Wherein, civil power branch road comprises city's net 100, and city's net 100 is for power to user load 600 and to energy-storage battery 400 discharge and recharge.In embodiments of the present invention, civil power branch road also necessary comprise the ammeter 800 (such as four-quadrant ammeter 800) of connecting with city's net 100 in order to real-time detection display and record city net power, grid-connected feed condition and data; Comprise between civil power branch road and AC bus K switch 1 for control city's net 100 and AC bus from grid-connected.
Photovoltaic branch road comprises photovoltaic power supply source 200 and photovoltaic bimodulus inverter 300.Photovoltaic power supply source 200 can be any solar powered source, such as photovoltaic battery array.After photovoltaic power supply source 200 is connected with photovoltaic bimodulus inverter 300, then be connected to AC bus, and can power to user load 600 via load branch, energy storage branch road and civil power branch road, energy-storage battery 400 to be charged and to city's net 100 feed.Wherein, photovoltaic bimodulus inverter 300 is for following voltage or the Self-tuning System output AC voltage of city's net 100.In embodiments of the present invention, after photovoltaic power supply source 200 is connected with photovoltaic bimodulus inverter 300, ammeter 900 (such as PV ammeter 900) of can also connecting is with the power supply state of real-time detection display and record photovoltaic power supply source and data.
Energy storage branch road comprises energy-storage battery 400 and the two-way bimodulus inverter 500 of energy storage.After energy-storage battery 400 is connected with the two-way bimodulus inverter 500 of energy storage, being connected to AC bus again, can, via civil power branch road, photovoltaic branch road and load branch, be its charging by city's net 100 and/or photovoltaic power supply source 200, to city's net 100 feed, and power for user load 600.Wherein, the two-way bimodulus inverter 500 of energy storage is for following the voltage of city's net 100 or following powering to user load 600 from net output AC voltage from net ac output voltage or Self-tuning System of photovoltaic bimodulus inversion 300, the two-way bimodulus inverter 500 of now energy storage is in direct current input AC output state, is namely operated in inversion direction; The two-way bimodulus inverter 500 of energy storage also has and exchanges input direct-current output state, namely rectification square to, the direct current under its rectification state exports the charging for controlling energy-storage battery 400.Comprise between energy storage branch road and AC bus K switch 4 for control energy-storage battery 400 from grid-connected.
User load branch road and absorbing load branch road comprise user load 600 and absorbing load 700 respectively.User load 600 is service objects of whole electric power system, the power supply branch road of system: civil power branch road, photovoltaic branch road and energy storage branch road are all in order to the power demands meeting user load 600 designs.Absorbing load 700 be when photovoltaic off-grid power and user load 600 and energy-storage battery 400 photovoltaic power supply source 200 all no longer can be received to produce electric energy time absorb the device of dump energy.In embodiments of the present invention, user load 600 is connected with AC bus respectively with absorbing load 700, and user load 600 and the break-make between absorbing load 700 and AC bus are controlled by electric switch K3 and K5 respectively.The respective load control circuit that two kinds of loads are all attached, to increase the degree of freedom of system works, advantageously in Optimized System Design.
The photovoltaic of the embodiment of the present invention also comprises central controller (Fig. 1 is not shown) from grid-connected and energy storage mixed power supply system, each building block above-mentioned of this central controller and this electric power system sets up communication, the status signal of each building block described in Real-time Collection, and judge according to real time status information and control the current operation mode of this electric power system.That is, central controller is gathered by the current state information of the city's net 100 to electric power system, photovoltaic power supply source 200, photovoltaic bimodulus inverter 300, energy-storage battery 400, energy storage two way convertor 500, user load 600 all parts, and then judge and send instruction to corresponding building block, thus control described electric power system and work in appropriate mode of operation.It should be noted that, the similar statement such as so-called in each embodiment of the present invention " through judging " or " judging through system ", if without specified otherwise, all represents and is judged by central controller.
Realize of the present inventionly both to run under net pattern, the photovoltaic that can be incorporated into the power networks again is from grid-connected and energy storage mixed power supply system, the control circuit of the two kinds of inverters (photovoltaic bimodulus inverter 300 and energy storage two-way bimodulus inverter 500) in requirement system can be operated in grid-connected and under net two kinds of control models, have to have when grid-connected and follow the tracks of urban network electricity pressure or AC bus benchmark alternating voltage (works in from net pattern at native system photovoltaic bimodulus inverter 300, the ac output voltage of its Self-tuning System can be used as reference voltage) ability, and from having the ability of Self-tuning System output voltage during net.Figure 2 shows that the electrical schematic diagram of the photovoltaic bimodulus inverter 300 of the embodiment of the present invention, photovoltaic bimodulus inverter 300 comprises single-phase/three-phase inverter (main loop of power circuit) 301, sample circuit 302, and controlling calculation circuit 303.Inverter power circuit topology can be divided into single-phase and three-phase two class according to interchange output, and the present embodiment selects wherein any class; Photovoltaic DC-to-AC converter can be divided into from net and grid-connected two kinds according to control model, bimodulus inverter described in the present embodiment just refers to that the control circuit of photovoltaic DC-to-AC converter can realize from net and grid-connected two kinds of control models, is integrated realize two kinds of control models and can switch mutually according to operation mode by controlling calculation circuit 303; Sample circuit 302 is for gathering the output of photovoltaic bimodulus inverter 300 and input voltage and electric current, and the circuit of correlation behavior parameter.Figure 3 shows that the electrical schematic diagram of the two-way bimodulus inverter 500 of the energy storage of the embodiment of the present invention, comprise the two-way inverter of single-phase/three-phase (main loop of power circuit) 501, sample circuit 502, and controlling calculation circuit 503.Two-way inverter means: main loop of power circuit both can export (inversion direction) by direct current input AC, can also exchange input direct-current and export (rectification square to); Controlling calculation circuit 503, except realizing from except net and grid-connected bi-mode control, also requires to realize single-phase or three phase rectifier control; Sample circuit is for gathering alternating current-direct current input and output voltage and the electric current of two-way inverter system, and correlation behavior parameter.
The photovoltaic of the embodiment of the present invention is described from various mode of operations that are grid-connected and energy storage mixed power supply system below in conjunction with accompanying drawing 4-12.
Figure 4 shows that grid-connected and band carries the system schematic of pattern.Closed with reference to figure 1, K1, K2 and K3, K4 and K5 disconnects.With reference to figure 4, photovoltaic power supply source 200, city's net 100 and user load 600 are communicated with AC bus respectively, and energy storage branch road and absorbing load 700 are in off-state with it.Now the power of user load 600 is less than power and energy-storage battery 400 that photovoltaic power supply source 200 can provide through judging without the need to charging, be independently that user load 600 is powered by photovoltaic power supply source 200, the dump energy in photovoltaic power supply source 200 is fed to city's net 100 simultaneously, to ensure the electric energy that user load 600 utilizes photo-voltaic power supply to greatest extent and produces, that is consume the electric energy of city's net 100 as few as possible.Wherein photovoltaic bimodulus inverter 300 output AC voltage follows the voltage of city's net 100, and now the two-way inverter 500 of energy storage bimodulus is in cut-off state.It is noted that in various embodiments of the present invention, judging that energy-storage battery 400 is in needs charging, electric discharge or preferential charged state, can be judged, and realized by the controlling calculation circuit 503 of the two-way inverter 500 of energy storage bimodulus by CS central controller.
Figure 5 shows that grid-connected, band carries, charges and present the system schematic of net pattern.Close with reference to figure 1, K1, K2, K3 and K4, K5 disconnects.With reference to figure 5, photovoltaic power supply source 200, city's net 100, user load 600 and energy-storage battery 400 are communicated with AC bus respectively, and absorbing load 700 is in off-state with it.Now the power of user load 600 is less than the power that photovoltaic power supply source 200 can provide, and energy-storage battery 400 is when judgement need preferentially be charged, photovoltaic power supply source 200 is independent to power for user load 600, and electricity more than needed is preferably energy-storage battery 400 and charges, if also residue has electricity to city's net 100 feed.The electric energy that described user load utilizes photo-voltaic power supply to greatest extent and produces can be ensured like this, that is consume the electric energy of described city net as few as possible.Now, the ac output voltage of photovoltaic bimodulus inverter 300 follows the tracks of the voltage of city's net 100, and the two-way bimodulus inverter 500 of energy storage works in rectification square and charges to for energy-storage battery 400.That under this mode of operation, K1 must remain closed, and namely civil power branch road is in dormant state with should be noted, for the access of high power load provides stand-by electric energy.
Figure 6 shows that grid-connected, band carries, presents the system schematic of net and charge mode.Close with reference to figure 1, K1, K2, K3 and K4, K5 disconnects.With reference to figure 6, photovoltaic power supply source 200, city's net 100, user load 600 and energy-storage battery 400 are communicated with AC bus respectively, and absorbing load 700 is in off-state with it.Now the power of user load 600 is less than the power that photovoltaic power supply source 200 can provide, and central controller judges Qia Shixiang city net feed, and energy-storage battery 400 is through judging to charge, photovoltaic power supply source 200 powers for user load 600 separately, electricity more than needed, preferentially to city's net 100 feed, if also residue has electricity, charges for energy-storage battery 400.Now, photovoltaic bimodulus inverter 300 ac output voltage follows the tracks of the voltage of city's net 100, and the two-way bimodulus inverter 500 of energy storage is in holding state, and working method is that rectification square charges to also preparing for energy-storage battery 400.
Figure 7 shows that the grid-connected and band of energy-storage battery carries the system schematic of pattern.Closed with reference to figure 1, K1, K3 and K4, K2 and K5 disconnects.With reference to figure 7, city's net 100, user load 600 and energy-storage battery 400 are communicated with AC bus, and photovoltaic branch road and absorbing load 700 are in off-state with it.Now power supply is ended in photovoltaic power supply source 200, and system judges Qia Shixiang city net feed, and energy-storage battery has enough electricity to be that user load is powered and to city's net feed, by the two-way bimodulus inverter 500 of energy storage control energy-storage battery 400 discharge be user load 600 power and the part electric energy stored to city's net 100 feed.Now, photovoltaic bimodulus inverter 300 is in cut-off state, and the two-way bimodulus inverter 500 of energy storage works in inversion direction discharge condition, and its ac output voltage follows urban network electricity pressure.
Figure 8 shows that city's guipure carries the system schematic of pattern.Close with reference to figure 1, K1 and K3, K2, K4 and K5 disconnect.With reference to figure 8, city's net 100, user load 600 is communicated with AC bus, and photovoltaic branch road, energy storage branch road and absorbing load 700 are in off-state with it.Now power supply is ended in photovoltaic power supply source 200, and energy-storage battery 400 is through judging not allow electric discharge, is independently that user load 600 is powered by city's net 100.Now, photovoltaic bimodulus inverter 300 and the two-way bimodulus inverter 500 of energy storage are all in cut-off state.
Figure 9 shows that city's guipure carries and the system schematic of charge mode.Closed with reference to figure 1, K1, K3 and K4, K2 and K5 disconnects.With reference to figure 9, city's net 100, user load 600 and energy-storage battery 400 are communicated with AC bus, and photovoltaic branch road and absorbing load 700 are in off-state with it.Now power supply is ended in photovoltaic power supply source 200, and energy-storage battery 400 is through judging to need charging, is independently that user load 600 is powered by city's net 100.Now, the two-way bimodulus inverter 500 of energy storage works in rectification square to charged state, and photovoltaic bimodulus inverter 300 is in cut-off state.
Figure 10 shows that the grid-connected and band of photovoltaic off-grid, energy-storage battery carries the system schematic of pattern.Closed with reference to figure 1, K2, K3 and K4, K1 and K5 disconnects.With reference to Figure 10, photovoltaic power supply source 200, user load 600, energy-storage battery 400 are communicated with AC bus, and civil power branch road and absorbing load 700 are in off-state with it.Now city's net 100 power-off, user load 600 power is greater than photovoltaic power supply source 200 power, and energy-storage battery 400 is through judging to allow electric discharge; Jointly powered for user load 600 by photovoltaic power supply source 200 and energy-storage battery 400.Now, photovoltaic bimodulus inverter 300 works in from net state Self-tuning System output AC voltage, and the two-way bimodulus inverter 500 of energy storage works in parallel network reverse direction discharge mode, and its ac output voltage follows the output voltage of photovoltaic bimodulus inverter 300.
Figure 11 shows that photovoltaic off-grid, band carry, charging and the system schematic of absorption mode.Close with reference to figure 1, K2, K3, K4 and K5, K1 disconnects.With reference to Figure 11, photovoltaic power supply source 200, user load 600, energy-storage battery 500 are communicated with AC bus, and civil power branch road is in off-state with it.Now city's net 100 power-off, user load 600 power is less than photovoltaic power supply source 200 power, and energy-storage battery 400 is through judging to charge; Be independently that user load 600 is powered by photovoltaic power supply source 200, electricity more than needed is preferably energy-storage battery 400 and charges, if also residue has electricity to be absorbed by absorbing load 700.Now, photovoltaic bimodulus inverter 300 works in from net state Self-tuning System output AC voltage, and the two-way bimodulus inverter 500 of energy storage is in rectification square to charged state.
Figure 12 shows that the system schematic of energy-storage battery from net powering mode.Close with reference to figure 1, K3 and K4, K1, K2 and K5 disconnect.With reference to Figure 12, user load 600 is communicated with AC bus with energy-storage battery 400, and civil power branch road, photovoltaic branch road and absorbing load 700 are in off-state with it.Now city's net 100 power-off, power supply is ended in photovoltaic power supply source 200, and energy-storage battery 400 is through judging to discharge; Be independently that user load 600 is powered by energy-storage battery 400.Now, photovoltaic bimodulus inverter 300 is in cut-off state, and the two-way bimodulus inverter 500 of energy storage works in from net inversion direction, and Self-tuning System ac output voltage also controls the electric discharge of energy-storage battery 400.
The invention provides a kind of photovoltaic of applicable family expenses from grid-connected and energy storage mixed power supply system, have during by arranging grid-connected and follow the tracks of urban network electricity pressure energy power, from photovoltaic bimodulus inverter and the energy storage two-way bimodulus inverter during net with Self-tuning System output voltage capability, photovoltaic off-grid is powered and is incorporated in same electric power system with grid-connected power supply, complementary with the excellent inverse gesture realizing photovoltaic off-grid and grid-connected power supply, be conducive to the optimized design realizing system.
Although illustrate and describe embodiments of the invention, for the ordinary skill in the art, be appreciated that and can carry out multiple change, amendment, replacement and modification to these embodiments without departing from the principles and spirit of the present invention, scope of the present invention is by claims and equivalency thereof.
Claims (11)
1. photovoltaic is from a grid-connected and energy storage mixed power supply system, it is characterized in that, comprising: city's net, photovoltaic power supply source, photovoltaic bimodulus inverter, energy-storage battery, the two-way bimodulus inverter of energy storage, user load and absorbing load, wherein:
Described city net is used for powering to described user load, charges, and carry the feedback net electric energy in described photovoltaic power supply source to described energy-storage battery;
After described photovoltaic power supply source is connected with described photovoltaic bimodulus inverter, for powering to described user load, described energy-storage battery is charged, and to described city net feed, wherein, described photovoltaic bimodulus inverter is used for following described urban network electricity pressure or Self-tuning System output voltage;
After described energy-storage battery is connected with the two-way bimodulus inverter of described energy storage, for powering to described user load, wherein, described energy storage two-way bimodulus inverter is followed described urban network electricity pressure or the output voltage of described photovoltaic bimodulus inverter or Self-tuning System output voltage and is powered to described user load, and described energy storage two-way bimodulus inverter works in rectification square to the charging to control described energy-storage battery;
Described absorbing load is connected with described photovoltaic power supply source, to power and to remaining electric energy after described energy-storage battery charging for consuming described photovoltaic power supply source to described user load,
Wherein, when described photovoltaic is operated in photovoltaic off-grid from grid-connected and energy storage mixed power supply system, band carries, when charging and absorption mode, photovoltaic power supply source, user load, energy-storage battery is communicated with AC bus, civil power branch road and AC bus are in off-state, city's net power-off, user load power is less than photovoltaic power supply source power, and energy-storage battery is through judging to charge, be independently that user load is powered by photovoltaic power supply source, electricity more than needed is preferably energy-storage battery charging, if also residue has electricity to be absorbed by absorbing load, wherein, photovoltaic bimodulus inverter works in from net state Self-tuning System output AC voltage, the two-way bimodulus inverter of energy storage is in rectification square to charged state.
2. photovoltaic as claimed in claim 1 is from grid-connected and energy storage mixed power supply system, it is characterized in that, described photovoltaic also carries at grid-connected and band from grid-connected and energy storage mixed power supply system, grid-connected, band carries, charging and feedback net, and grid-connected, band carries, feedback net and charging, and the grid-connected and band of energy-storage battery carries, city's guipure carries, city's guipure carries and charges, photovoltaic off-grid, energy-storage battery grid-connected and band carry, energy-storage battery carries eight kinds of MODE of operation from guipure.
3. photovoltaic as claimed in claim 2 is from grid-connected and energy storage mixed power supply system, it is characterized in that, a described grid-connected and band pattern of carrying comprises:
When described user load power be less than the power in described photovoltaic power supply source and described energy-storage battery through judging without the need to charging time, described photovoltaic power supply source independently powers for described user load, dump energy is fed to described city net simultaneously, wherein said photovoltaic bimodulus inverter output voltage follows described urban network electricity pressure, and the two-way bimodulus inverter of described energy storage is in cut-off state.
4. photovoltaic as claimed in claim 2 is from grid-connected and energy storage mixed power supply system, it is characterized in that, described grid-connected, band carries, charging and feedback net pattern comprise:
When described user load power is less than the power in described photovoltaic power supply source and described energy-storage battery need preferentially charge through judgement, described photovoltaic power supply source is independently for described user load is powered and be the charging of described energy-storage battery, then dump energy is fed to described city net, wherein said photovoltaic bimodulus inverter output voltage follows described urban network electricity pressure, and the two-way bimodulus inverter of described energy storage is in rectification charging state.
5. photovoltaic as claimed in claim 2 is from grid-connected and energy storage mixed power supply system, it is characterized in that, described grid-connected, band carries and feedback net and charge mode comprise:
When described user load power is less than the power in described photovoltaic power supply source and described city net needs preferential feed through judgement, described photovoltaic power supply source is independently for described user load is powered and to described city net feed, then dump energy is the charging of described energy-storage battery, wherein said photovoltaic bimodulus inverter output voltage follows described urban network electricity pressure, and the two-way bimodulus inverter of described energy storage is in rectification charging state.
6. photovoltaic as claimed in claim 2 is from grid-connected and energy storage mixed power supply system, it is characterized in that, described energy-storage battery is grid-connected and be with the pattern of carrying to comprise:
When the cut-off power supply of described photovoltaic power supply source, described city net has electricity, and described energy-storage battery is when judgement allows electric discharge, described energy-storage battery is independently powered for described user load, the part electric energy simultaneously stored is to described city net feed, the two-way bimodulus inverter of wherein said energy storage is in inversion discharge condition, and output voltage follows urban network electricity pressure, and described photovoltaic bimodulus inverter is in cut-off state.
7. photovoltaic as claimed in claim 2 is from grid-connected and energy storage mixed power supply system, and it is characterized in that, the described city guipure pattern of carrying comprises:
When the cut-off power supply of described photovoltaic power supply source, city's net has electricity, and described energy-storage battery is when judgement does not allow electric discharge, and described city net is independent powers for described user load, and wherein said photovoltaic bimodulus inverter and the two-way bimodulus inverter of energy storage are all in cut-off state.
8. photovoltaic as claimed in claim 2 is from grid-connected and energy storage mixed power supply system, and it is characterized in that, described city guipure carries and charge mode comprises:
When the cut-off power supply of described photovoltaic power supply source, city's net has electricity, and described energy-storage battery is when judgement allows charging, described city net is independent powers for described user load and charges for described energy-storage battery, the two-way bimodulus inverter of wherein said energy storage is in rectification charging state, and described photovoltaic bimodulus inverter is in cut-off state.
9. photovoltaic as claimed in claim 2 is from grid-connected and energy storage mixed power supply system, it is characterized in that, described photovoltaic off-grid, energy-storage battery are grid-connected and be with the pattern of carrying to comprise:
When described photovoltaic power supply source can power, the net power-off of described city, described user load power is greater than described photovoltaic power supply source power, and described energy-storage battery is when judgement allows electric discharge, described photovoltaic power supply source and energy-storage battery is grid-connected jointly powers for described user load, wherein said photovoltaic bimodulus inverter Self-tuning System output voltage, the two-way bimodulus inverter of described energy storage is in inversion discharge condition, and output voltage follows the output voltage of described photovoltaic bimodulus inverter.
10. photovoltaic as claimed in claim 2 is from grid-connected and energy storage mixed power supply system, and it is characterized in that, described energy-storage battery comprises from the guipure pattern of carrying:
When the cut-off power supply of described photovoltaic power supply source, the net power-off of described city, when described energy-storage battery is through judging to discharge, independently powered for described user load by described energy-storage battery, wherein said photovoltaic bimodulus inverter is in cut-off state, the two-way bimodulus inverter of described energy storage is in inversion discharge condition, Self-tuning System output voltage.
11. photovoltaics as described in any one of claim 1-10 are from grid-connected and energy storage mixed power supply system, it is characterized in that, also comprise central controller, described central controller for monitoring the real-time status of each building block of described electric power system, and judges according to real time status information and controls the current operation mode of described electric power system.
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| CN103679292B (en) * | 2013-12-17 | 2017-01-11 | 中国科学院自动化研究所 | Electricity collaborative optimization method for double batteries of intelligent micro power grid |
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| CN106786755A (en) * | 2016-12-30 | 2017-05-31 | 国网山西省电力公司太原供电公司 | A kind of energy-storage system and control method |
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