CN103138637A - Hybrid power supply system for photovoltaic off network, photovoltaic combined network, city network and energy storage - Google Patents
Hybrid power supply system for photovoltaic off network, photovoltaic combined network, city network and energy storage Download PDFInfo
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- CN103138637A CN103138637A CN2011103857450A CN201110385745A CN103138637A CN 103138637 A CN103138637 A CN 103138637A CN 2011103857450 A CN2011103857450 A CN 2011103857450A CN 201110385745 A CN201110385745 A CN 201110385745A CN 103138637 A CN103138637 A CN 103138637A
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
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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
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Abstract
The invention provides a hybrid power supply system for a photovoltaic off network, a photovoltaic combined network, a city network and energy storage. The hybrid power supply system comprises the city network, a photovoltaic power supply, a photovoltaic bimodule inverter, an energy storage battery, an energy storage bidirectional converter, a user load and an absorbing load. The city network is used for supplying power for the user load and for bearing electric energy of a photovoltaic feedback network. After the photovoltaic power supply and the photovoltaic bimodule inverter are connected, the photovoltaic power supply is used for supplying power for the user load and feeding back photovoltaic power supply to the city network. After the energy storage battery is connected with the energy storage bidirectional converter, the energy storage battery is connected with the photovoltaic power supply and the photovoltaic bimodule inverter to charge the energy storage battery through the photovoltaic power supply and to supply power for the user load through the photovoltaic bimodule inverter. The absorbing load is connected with the photovoltaic power supply to consume surplus energy after the photovoltaic power supply supplies power for the user load and charges the energy storage battery. According to the hybrid power supply system, complementary of advantages and disadvantages of power supply of the photovoltaic off network and the photovoltaic combined network is achieved, and the hybrid power supply system is beneficial for an optimization design of a maximized system.
Description
Technical field
The present invention relates to the photovoltaic power supply field, particularly a kind of low profile photovoltaic of family expenses from be incorporated into the power networks, city's net and energy storage mixed power supply system.
Background technology
At present mainly contain two kinds of forms towards the photovoltaic power supply product of home unit on the market: (one) power supply of being incorporated into the power networks: it is load supplying jointly that the electric energy that the photovoltaic power supply source produces merges with city's net through combining inverter; (2) from the net power supply: the electric energy of photovoltaic power supply source generation and city's net isolation are independent is load supplying.No matter be incorporated into the power networks or from net, the energy storage of the certain capacity that all needs to attach troops to a unit guaranteeing power supply quality, and can take full advantage of the electric energy that photovoltaic produces.
The characteristics of power supply of being incorporated into the power networks are, photovoltaic electric energy and city net accesses same bus, is load supplying simultaneously.If the photovoltaic electric energy surpasses bearing power, more than the photovoltaic electric energy oppositely present net; If photovoltaic electric can satisfy bearing power, city's net and stream replenish.Therefore the advantage of powering mode of being incorporated into the power networks is, the constraints of system is few, and flexibility is large.But its major defect is: under grid-connected powering mode, combining inverter is based on urban network electricity and presses definite its output voltage amplitude and phase place, it is the power supply state that photovoltaic power supply is limited by city's net, in case city's net power down, combining inverter has just lost basis of reference, and therefore grid-connected power supply can not move under island mode.And when city's net power down, require combining inverter to have real-time detectability, and immediately quit work, be fed to city's net with the electric current of avoiding photovoltaic power supply source generation, namely require to have isolated island effect prevention.
From the advantage of netting power supply be, can independently provide the output voltage benchmark from the net inverter, be not limited by the power supply state of city's net, can move 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, need to a kind ofly both can move the photovoltaic mixed power supply system that can be incorporated into the power networks again under island mode.
Summary of the invention
Purpose of the present invention is intended to solve at least above-mentioned and from the system defect of network technology, particularly propose a kind ofly both can move under island mode, the photovoltaic that can be incorporated into the power networks again from be incorporated into the power networks, city's net and energy storage mixed power supply system.
For achieving the above object, the invention provides a kind of photovoltaic from be incorporated into the power networks, city's net 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, energy storage two way convertor, user load and absorbing load.Wherein: described city net is used for described user load power supply, and carrying photovoltaic feedback net electric energy; Described photovoltaic power supply source be connected after photovoltaic bimodulus inverter connects, be used for described user load power supply, and to described city net feed, wherein, described photovoltaic bimodulus inverter is used for following described urban network electricity and presses or the output voltage of certainly adjusting; Described energy-storage battery be connected after the energy storage two way convertor connects, be connected with described photovoltaic power supply source and described photovoltaic bimodulus inverter, be used for by described photovoltaic power supply source, described energy-storage battery being charged, and by described photovoltaic bimodulus inverter, described user load is powered, wherein, described energy storage two way convertor is used for controlling discharging and recharging described energy-storage battery; Described absorbing load be connected the photovoltaic power supply source and connect, be used for consuming described photovoltaic power supply source to described user load power supply and to the dump energy after described energy-storage battery charging.
In embodiments of the present invention, described photovoltaic from be incorporated into the power networks, city's net and energy storage mixed power supply system can carry at grid-connected and band, grid-connected, band carries, charges and the feedback net, grid-connected, band carries, presents net and charging, energy-storage battery is incorporated into the power networks and is with and carries, and city's guipure carries, and photovoltaic off-grid, energy-storage battery are incorporated into the power networks and are with and carry, photovoltaic off-grid, band carry, charge and absorb, and energy-storage battery carries under eight kinds of patterns from guipure works.Wherein, band described in the embodiment of the present invention carries and refers to be load supplying.
Carry pattern for grid-connected and band, when described user load power less than the power in described photovoltaic power supply source and described energy-storage battery when judgement need not to charge, described photovoltaic power supply source is independently described user load power supply, dump energy is fed to described city net simultaneously, with the electric energy that guarantees that described user load utilizes photo-voltaic power supply to produce to greatest extent, that is consume as few as possible the electric energy that net in described city.Wherein said photovoltaic bimodulus inverter output voltage is followed described urban network electricity and is pressed, and described energy storage two way convertor is in cut-off state.
For grid-connected, band carries, charging and feedback net pattern, when described user load power less than the power in described photovoltaic power supply source and described energy-storage battery when judgement needs preferential charging, described photovoltaic power supply source is independently described user load power supply and is described energy-storage battery charging, then dump energy is fed to described city net, with the electric energy that guarantees that described user load utilizes photo-voltaic power supply to produce to greatest extent, that is consume as few as possible the electric energy that net in described city.Wherein said photovoltaic bimodulus inverter output voltage is followed described urban network electricity and is pressed, and described energy storage two way convertor is in the charging state of a control.
For grid-connected, band carries, feedback net and charge mode, when described user load power less than the power in described photovoltaic power supply source and described city net when judgement needs preferential feed, described photovoltaic power supply source is independently described user load power supply and to described city net feed, then dump energy is described energy-storage battery charging, wherein said photovoltaic bimodulus inverter is followed described urban network electricity and is pressed output voltage, and described energy storage two way convertor is in the charging state of a control.
Be incorporated into the power networks and be with the pattern of carrying for energy-storage battery, when the source cut-off power supply of described photovoltaic power supply, described city net has electricity, and when described energy-storage battery allows discharge through judgement, described energy-storage battery is independently described user load power supply, simultaneously with the part electric energy of its storage to described city net feed, wherein said energy storage two way convertor is controlled the discharge of described energy-storage battery, described photovoltaic bimodulus inverter output voltage is followed described urban network electricity and is pressed.
Carry pattern for city's guipure, when the source cut-off power supply of described photovoltaic power supply, city's net has electricity, and described energy-storage battery is not when judgement allows to discharge, described city net is independent is described user load power supply, and wherein said photovoltaic bimodulus inverter and energy storage two way convertor are in cut-off state.
Be incorporated into the power networks and be with the pattern of carrying for photovoltaic off-grid, energy-storage battery, when described photovoltaic power supply source can power, the net outage of described city, described user load power is greater than described photovoltaic power supply source power, and when described energy-storage battery allows discharge through judgement, it is described user load power supply that described photovoltaic power supply source and energy-storage battery are incorporated into the power networks common, wherein said photovoltaic bimodulus inverter is from the output voltage of adjusting, and described energy storage two way convertor is followed the VD in described photovoltaic power supply source to control the discharge of described energy-storage battery.
For photovoltaic off-grid, band carry, charging and absorption mode, when described photovoltaic power supply source can power, the net outage of described city, described user load power is less than described photovoltaic power supply source power, and when described energy-storage battery needs charging through judgement, described photovoltaic power supply source is separately described user load power supply, dump energy is preferably described energy-storage battery charging, then also have dump energy to be absorbed by described absorbing load, wherein said photovoltaic bimodulus inverter is from adjusting ac output voltage, and described energy storage two way convertor is in the charging state of a control.
Carry pattern for energy-storage battery from guipure, when the source cut-off power supply of described photovoltaic power supply, the net outage of described city, when described energy-storage battery can discharge through judgement, be independently described user load power supply by described energy-storage battery, wherein said photovoltaic bimodulus inverter is from adjusting output voltage, and described energy storage two way convertor is in the control of discharge state.
In embodiments of the present invention, described photovoltaic from be incorporated into the power networks, city's net and energy storage mixed power supply system also comprise central controller, above-mentioned each building block of described central controller and described electric power system is set up communication, the status signal of described each building block of Real-time Collection, and judge and control the work at present pattern of described electric power system according to real-time status information, namely judge by the current state to described each building block of electric power system, thereby determine and control described electric power system to run on appropriate mode of operation.
The photovoltaic that the invention provides a kind of suitable family expenses from be incorporated into the power networks, city's net and energy storage mixed power supply system, has the urban network electricity of tracking pressure energy power when being incorporated into the power networks by setting, have photovoltaic bimodulus inverter and energy storage two way convertor from the ability of the output voltage of adjusting during from net, photovoltaic off-grid and the power supply of being incorporated into the power networks are unified in same electric power system, to realize photovoltaic off-grid and the excellent contrary gesture complementation of the power supply of being incorporated into the power networks, be conducive to the optimal design of the system that maximizes.
The aspect that the present invention adds and advantage part in the following description provide, and part will become obviously from the following description, or recognize by practice of the present invention.
Description of drawings
Above-mentioned and/or the additional aspect of the present invention and advantage will become from the following description of the accompanying drawings of embodiments and obviously and easily understand, wherein:
The photovoltaic that Fig. 1 provides for the embodiment of the present invention from be incorporated into the power networks, the configuration diagram of city's net 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 energy storage two way convertor 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 the system schematic that grid-connected, the band of the embodiment of the present invention carried, charges and presented the net pattern;
Fig. 6 is that grid-connected, the band of the embodiment of the present invention carries, the system schematic of feedback net and charge mode;
Fig. 7 is that the energy-storage battery of the embodiment of the present invention is incorporated into the power networks and with the system schematic of carrying pattern;
Fig. 8 is the system schematic that city's guipure of the embodiment of the present invention carries pattern;
Fig. 9 is that photovoltaic off-grid, the energy-storage battery of the embodiment of the present invention is incorporated into the power networks and with the system schematic of carrying pattern;
Figure 10 is that photovoltaic off-grid, the band of the embodiment of the present invention carries, the system schematic of charging and absorption mode;
Figure 11 is that the energy-storage battery of the embodiment of the present invention is from the system schematic of net powering mode.
Embodiment
The below describes embodiments of the invention in detail, and the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or the element with identical or similar functions from start to finish.Be exemplary below by the embodiment that is described with reference to the drawings, only be used for explaining the present invention, and can not be interpreted as limitation of the present invention.
In the description of this specification, the description of reference term " embodiment ", " some embodiment ", " example ", " concrete example " or " some examples " etc. means to be contained at least one embodiment of the present invention or example in conjunction with specific features, structure, material or the characteristics of this embodiment or example description.In this manual, the schematic statement of above-mentioned term not necessarily referred to identical embodiment or example.And the specific features of description, structure, material or characteristics can be with suitable mode combinations in any one or more embodiment or example.
Figure 1 shows that photovoltaic that the embodiment of the present invention provides from be incorporated into the power networks, the configuration diagram of city's net and energy storage mixed power supply system.As shown in Figure 1, the photovoltaic of the embodiment of the present invention from be incorporated into the power networks, city's net and energy storage mixed power supply system comprise: city's net 100, photovoltaic power supply source 200, photovoltaic bimodulus inverter 300, energy-storage battery 400, energy storage two way convertor 500, 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 (for example electric switch K1, K2, K3, K4 and K5).
Wherein, the civil power branch road comprises city's net 100, and city's net 100 is used for the electric energy to user load 600 power supplies and carrying photovoltaic feedback net.In embodiments of the present invention, the civil power branch road is also necessary comprises the ammeter 800 (for example the four-quadrant ammeter 800) of connect with city's net 100 in order to real-time detection display and records that city's net is powered, feed condition and data are incorporated into the power networks; Comprise between civil power branch road and AC bus K switch 1 be used for controlling city's net 100 and AC bus from being incorporated into the power networks.
The 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, for example photovoltaic battery array.Photovoltaic power supply source 200 are connected with photovoltaic bimodulus inverter connect after, then be connected to the AC bus, and can be via load branch, energy storage branch road and civil power branch road, to user load 600 power supplies, to energy-storage battery 400 chargings and to city's net 100 feeds.Wherein, photovoltaic bimodulus inverter 300 is used for following the voltage of city's net 100 or the output AC voltage of certainly adjusting.In embodiments of the present invention, photovoltaic power supply source 200 is with after photovoltaic bimodulus inverter 300 is connected, and the ammeter 900 of can also connecting (for example the PV ammeter 900) is with real-time detection display and record power supply state and the data of photovoltaic power supply source.
The energy storage branch road comprises energy-storage battery 400, energy storage two way convertor 500 and photovoltaic bimodulus inverter 300.Energy-storage battery 400 are connected with the energy storage two way convertor connect after, then be connected to photovoltaic bimodulus inverter 300, be connected at last the AC bus, can be via civil power branch road, photovoltaic branch road and load branch, being its charging by photovoltaic power supply source 200, to city's net 100 feeds, and is user load 600 power supplies.Wherein, energy storage two way convertor 500 is used for controlling energy-storage battery and discharges and recharges, and photovoltaic bimodulus inverter 300 is used for following the voltage of city's net 100 or the output AC voltage of certainly adjusting.Comprise between energy-storage battery 400 and AC bus K switch 3 and K2 be used for to control energy-storage battery 400 from being incorporated into the power networks.
User load branch road and absorbing load branch road comprise respectively user load 600 and absorbing load 700.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 all design for the power demands that satisfies user load 600.Absorbing load 700 is to absorb the device of dump energy when photovoltaic off-grid power supply and user load 600 and energy-storage battery 400 all no longer can receive the electric energy that photovoltaic power supply source 200 produces.In embodiments of the present invention, user load 600 is connected with absorbing load and is connected with the AC bus respectively, and the break-make between user load 600 and absorbing load 700 and AC bus is controlled by electric switch K3 and K5 respectively.Two kinds of loads are attached load control circuit separately all, to increase the degree of freedom of system works, more is conducive to Optimized System Design.
The photovoltaic of the embodiment of the present invention from be incorporated into the power networks, city's net and energy storage mixed power supply system also comprise central controller (Fig. 1 is not shown), above-mentioned each building block of this central controller and this electric power system is set up communication, the status signal of described each building block of Real-time Collection, and judge and control the work at present pattern of this electric power system according to real-time status information.That is to say, central controller gathers by the current state information to city's net 100 of 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, work in appropriate mode of operation thereby control described electric power system.It should be noted that, if so-called in each embodiment of the present invention " through judgement " or similar statements such as " through system's judgements " without specified otherwise, all represent to be judged by central controller.
Realize of the present inventionly both can moving under the net pattern, the photovoltaic that can be incorporated into the power networks again from be incorporated into the power networks, city's net and energy storage mixed power supply system, the control circuit of the photovoltaic bimodulus inverter 300 in the requirement system can be operated in and be incorporated into the power networks and under two kinds of control models of net, have and have the ability that urban network electricity is pressed of following the tracks of when being incorporated into the power networks, and have from the ability of adjusting output voltage during from net; Also require energy storage two way convertor 500 in system can control the charging and discharging of energy-storage battery 400.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 control counting circuit 303.The inverter power circuit topology can be divided into single-phase and three-phase two classes according to exchanging output, and the present embodiment is selected wherein any class; Photovoltaic DC-to-AC converter can be divided into from net and be incorporated into the power networks two kinds according to control model, the described bimodulus inverter of the present embodiment just refers to that the control circuit of photovoltaic DC-to-AC converter can realize from net and the two kinds of control models that are incorporated into the power networks, and integrates and realizes two kinds of control models and can switch mutually according to operation mode by controlling counting circuit 303; Sample circuit 302 is used for gathering output and input voltage and the electric current of photovoltaic bimodulus inverter 300, and the circuit of correlation behavior parameter.Figure 3 shows that the electrical schematic diagram of the energy storage two way convertor 500 of the embodiment of the present invention, comprise two-way DC/DC current transformer (main loop of power circuit) 501, sample circuit 502, and control counting circuit 503.The described two-way DC/DC current transformer of the present embodiment means: two DC port of main loop of power circuit 501 both can be used as direct-flow input end, also can be used as dc output end; Control counting circuit 503 except implementing the bidirectional, dc Variable flow control, also have the photovoltaic power supply of following source VD, with the ability of in good time regulation and control and stream electric current; Sample circuit is responsible for gathering direct current input and output voltage and the electric current of two-way DC/DC current transformer 500, and other correlation behavior parameter of system.
The photovoltaic of describing the embodiment of the present invention below in conjunction with accompanying drawing 4-11 from be incorporated into the power networks, the various mode of operations of city's net and energy storage mixed power supply system.
Figure 4 shows that grid-connected and band carries the system schematic of pattern.With reference to figure 1, K1, K2 and K4 are closed, and K3 and K5 disconnect.With reference to figure 4, photovoltaic power supply source 200, city's net 100 and user load 600 are communicated with the AC bus respectively, and energy storage branch road and absorbing load 700 are in it off-state.This moment, the power of user load 600 need not charging less than photovoltaic power supply 200, the source power that can provide and energy-storage battery 400 through judgement, be independently user load 600 power supplies by photovoltaic power supply source 200, the dump energy in photovoltaic power supply source 200 is fed to city's net 100 simultaneously, utilize to greatest extent the electric energy of photo-voltaic power supply generation with assurance user load 600, that is consume as few as possible the electric energy of city's net 100.Wherein photovoltaic bimodulus inverter 300 output AC voltages are followed the voltage of city's net 100, and energy storage this moment two way convertor 500 is in cut-off state.Be pointed out that, in various embodiments of the present invention, judgement energy-storage battery 400 is in needs charging, discharge or preferential charged state, by system's central controller judgement.
Figure 5 shows that grid-connected, band carries, the system schematic of charging and feedback net pattern.With reference to figure 1, K1, K2, K3 and K4 are closed, and 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 the AC bus respectively, and absorbing load 700 is in it off-state.This moment user load 600 power less than photovoltaic power supply 200, the source power that can provide, and when energy-storage battery 400 needs preferential charging through judgement, photovoltaic power supply source 200 is independent is user load 600 power supplies, and electric weight more than needed is preferably energy-storage battery 400 chargings, if also residue has electric weight to city's net 100 feeds.Can guarantee like this electric energy that described user load utilizes photo-voltaic power supply to produce to greatest extent, that is consume as few as possible the electric energy of described city net.At this moment, the ac output voltage of photovoltaic bimodulus inverter 300 is followed the tracks of the voltage of city's net 100, and energy storage two way convertor 500 is controlled energy-storage battery 400 chargings.Be, under this mode of operation, K1 must remain closed with should be noted, and namely the civil power branch road is in dormant state, for the access of high power load provides stand-by electric energy.
Figure 6 shows that system schematic grid-connected, that band carries, presents net and charge mode.With reference to figure 1, K1, K2, K3 and K4 are closed, and 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 the AC bus respectively, and absorbing load 700 is in it off-state.This moment user load 600 power less than photovoltaic power supply 200, the source power that can provide, and when central controller judgement is proper to city's net feed, and energy-storage battery 400 can charge through judgement, photovoltaic power supply source 200 is separately user load 600 power supplies, electric weight more than needed is preferentially to city's net 100 feeds, if also residue has electric weight to be energy-storage battery 400 chargings.At this moment, the ac output voltage of photovoltaic bimodulus inverter 300 is followed the tracks of the voltage of city's net 100, and energy storage two way convertor 500 is in standby or controls energy-storage battery 400 charged states.
Figure 7 shows that energy-storage battery is incorporated into the power networks and with the system schematic of the pattern of carrying.With reference to figure 1, K1, K2, K3 and K4 are closed, and K5 disconnects.With reference to figure 7, city's net 100, user load 600 and energy-storage battery 400 are communicated with the AC bus, and photovoltaic power supply source 200 and absorbing load 700 are in it off-state.The 200 cut-off power supplies of photovoltaic power supply this moment source, and when system judgement is proper to city's net feed, and it is user load power supply and to city's net feed that energy-storage battery has enough electric weight, by energy storage two way convertor 500 control energy-storage batteries 400 discharges be user load 600 power supplies and with the part electric energy of its storage to city's net 100 feeds.At this moment, photovoltaic bimodulus inverter 300 works in the pattern of being incorporated into the power networks, and its ac output voltage is followed urban network electricity and pressed, and energy storage two way convertor 500 is controlled energy-storage battery 400 discharges.
Figure 8 shows that city's guipure carries the system schematic of pattern.With reference to figure 1, K1 and K4 are closed, and K2, K3 and K5 disconnect.With reference to figure 8, city's net 100, user load 600 is communicated with the AC bus, and photovoltaic branch road, energy storage branch road and absorbing load 700 are in it off-state.Photovoltaic power supply source 200 cut-off power supplies this moment, and energy-storage battery 400 do not allow discharge through judgement, is independently that user load 600 is powered by city's net 100.At this moment, photovoltaic bimodulus inverter 300 and energy storage two way convertor 500 all are in cut-off state.
Figure 9 shows that photovoltaic off-grid, energy-storage battery are incorporated into the power networks and with the system schematic of the pattern of carrying.With reference to figure 1, K2, K3 and K4 are closed, and K1 and K5 disconnect.With reference to figure 9, photovoltaic power supply source 200, user load 600, energy-storage battery 400 are communicated with the AC bus, and civil power branch road and absorbing load 700 are in it off-state.City net 100 outages this moment, user load 600 power are greater than photovoltaic power supply source 200 power, and energy-storage battery 400 allows discharge through judgement; Be user load 600 power supplies jointly by photovoltaic power supply source 200 and energy-storage battery 400.At this moment, photovoltaic bimodulus inverter 300 works in from the net state pattern from the output AC voltage of adjusting, and energy storage two way convertor 500 is controlled energy-storage batteries 400 discharges, and its output voltage is followed the VD in photovoltaic power supply source 200.
Figure 10 shows that photovoltaic off-grid, band carry, the system schematic of charging and absorption mode.With reference to figure 1, K2, K3, K4 and K5 are closed, and K1 disconnects.With reference to Figure 10, photovoltaic power supply source 200, user load 600, energy-storage battery 500 are communicated with the AC bus, and the civil power branch road is in it off-state.City net 100 outages this moment, user load 600 power are less than photovoltaic power supply source 200 power, and energy-storage battery 400 can charge through judgement; Be independently user load 600 power supplies by photovoltaic power supply source 200, electric weight more than needed is preferably energy-storage battery 400 chargings, if also residue has electric weight to be absorbed by absorbing load 700.At this moment, photovoltaic bimodulus inverter 300 works in from net state from adjusting output AC voltage, 500 control energy-storage battery 400 chargings of energy storage two way convertor.
Figure 11 shows that energy-storage battery is from the system schematic of net powering mode.With reference to figure 1, K2, K3 and K4 are closed, and K1 and K5 disconnect.With reference to Figure 11, user load 600 and energy-storage battery 400 are communicated with the AC bus, and civil power branch road, photovoltaic power supply source 200 and absorbing load 700 are in it off-state.City's net 100 outages this moment, photovoltaic power supply source 200 cut-off power supplies, and energy-storage battery 400 can discharge through judgement; Be independently user load 600 power supplies by energy-storage battery 400.At this moment, photovoltaic bimodulus inverter 300 works in from the net pattern from adjusting output voltage, 500 control energy-storage battery 400 discharges of energy storage two way convertor.
The photovoltaic that the invention provides a kind of suitable family expenses from be incorporated into the power networks, city's net and energy storage mixed power supply system, has the urban network electricity of tracking pressure energy power when being incorporated into the power networks by setting, have photovoltaic bimodulus inverter and energy storage two way convertor from the ability of the output voltage of adjusting during from net, photovoltaic off-grid and the power supply of being incorporated into the power networks are unified in same electric power system, to realize photovoltaic off-grid and the excellent contrary gesture complementation of the power supply of being incorporated into the power networks, be conducive to the optimal design of the system that maximizes.
Although illustrated and described embodiments of the invention, for the ordinary skill in the art, be appreciated that without departing from the principles and spirit of the present invention and can carry out multiple variation, modification, replacement and modification to these embodiment, scope of the present invention is by claims and be equal to and limit.
Claims (11)
- A photovoltaic from be incorporated into the power networks, city's net 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, energy storage two way convertor, user load and absorbing load, wherein:Described city net is used for described user load power supply, and carrying photovoltaic feedback net electric energy;Described photovoltaic power supply source be connected after photovoltaic bimodulus inverter connects, be used for described user load power supply, and to described city net feed, wherein, described photovoltaic bimodulus inverter is used for following described urban network electricity and presses or the output voltage of certainly adjusting;Described energy-storage battery be connected after the energy storage two way convertor connects, be connected with described photovoltaic power supply source and described photovoltaic bimodulus inverter, be used for by described photovoltaic power supply source, described energy-storage battery being charged, and by described photovoltaic bimodulus inverter, described user load is powered, wherein, described energy storage two way convertor is used for controlling discharging and recharging described energy-storage battery;Described absorbing load be connected the photovoltaic power supply source and connect, be used for consuming described photovoltaic power supply source to described user load power supply and to the dump energy after described energy-storage battery charging.
- Photovoltaic as claimed in claim 1 from be incorporated into the power networks, city's net and energy storage mixed power supply system, it is characterized in that, described photovoltaic from be incorporated into the power networks, city's net and energy storage mixed power supply system carry at grid-connected and band, grid-connected, band carries, charging and feedback net, and grid-connected, band carries, feedback net and charging, and energy-storage battery is incorporated into the power networks and is with and carries, city's guipure carries, photovoltaic off-grid, energy-storage battery are incorporated into the power networks and are with and carry, and photovoltaic off-grid, band carry, charge and absorb, and energy-storage battery carries under eight kinds of patterns from guipure works.
- Photovoltaic as claimed in claim 2 from be incorporated into the power networks, city's net and energy storage mixed power supply system, it is characterized in that, the described grid-connected and band pattern of carrying comprises:When described user load power less than the power in described photovoltaic power supply source and described energy-storage battery when judgement need not to charge, described photovoltaic power supply source is independently described user load power supply, dump energy is fed to described city net simultaneously, wherein said photovoltaic bimodulus inverter output voltage is followed described urban network electricity and is pressed, and described energy storage two way convertor is in cut-off state.
- Photovoltaic as claimed in claim 2 from be incorporated into the power networks, city's net 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 less than the power in described photovoltaic power supply source and described energy-storage battery when judgement needs preferential charging, described photovoltaic power supply source is independently described user load power supply and is described energy-storage battery charging, then dump energy is fed to described city net, wherein said photovoltaic bimodulus inverter output voltage is followed described urban network electricity and is pressed, and described energy storage two way convertor is in the charging state of a control.
- Photovoltaic as claimed in claim 2 from be incorporated into the power networks, city's net 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 less than the power in described photovoltaic power supply source and described city net when judgement needs preferential feed, described photovoltaic power supply source is independently described user load power supply and to described city net feed, then dump energy is described energy-storage battery charging, wherein said photovoltaic bimodulus inverter output voltage is followed described urban network electricity and is pressed, and described energy storage two way convertor is in the charging state of a control.
- Photovoltaic as claimed in claim 2 from be incorporated into the power networks, city's net and energy storage mixed power supply system, it is characterized in that, described energy-storage battery is incorporated into the power networks and is with the pattern of carrying to comprise:When the source cut-off power supply of described photovoltaic power supply, described city net has electricity, and when described energy-storage battery allows discharge through judgement, described energy-storage battery is independently described user load power supply, simultaneously with the part electric energy of its storage to described city net feed, wherein said energy storage two way convertor is controlled described energy-storage battery discharge, and described photovoltaic bimodulus inverter output voltage is followed described urban network electricity and pressed.
- Photovoltaic as claimed in claim 2 from be incorporated into the power networks, city's net and energy storage mixed power supply system, 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 not when judgement allows to discharge, and described city net is independent be that described user load is powered, and wherein said photovoltaic bimodulus inverter and energy storage two way convertor all are in cut-off state.
- Photovoltaic as claimed in claim 2 from be incorporated into the power networks, city's net and energy storage mixed power supply system, it is characterized in that, described photovoltaic off-grid, energy-storage battery are incorporated into the power networks and are with the pattern of carrying to comprise:When described photovoltaic power supply source can power, the net outage of described city, described user load power is greater than described photovoltaic power supply source power, and when described energy-storage battery allows discharge through judgement, it is described user load power supply that described photovoltaic power supply source and energy-storage battery are incorporated into the power networks common, wherein said photovoltaic bimodulus inverter is from adjusting output voltage, and described energy storage two way convertor is followed the VD in described photovoltaic power supply source, controls the discharge of described energy-storage battery.
- Photovoltaic as claimed in claim 2 from be incorporated into the power networks, city's net and energy storage mixed power supply system, it is characterized in that, described photovoltaic off-grid, band carry, charging and absorption mode comprise:When described photovoltaic power supply source can power, the net outage of described city, described user load power is less than described photovoltaic power supply source power, and when described energy-storage battery needs charging through judgement, described photovoltaic power supply source is separately described user load power supply, and dump energy is preferably described energy-storage battery charging, also has residue to be absorbed by described absorbing load, wherein said photovoltaic bimodulus inverter is from adjusting output voltage, and described energy storage two way convertor is in the charging state of a control.
- Photovoltaic as claimed in claim 2 from be incorporated into the power networks, city's net and energy storage mixed power supply system, it is characterized in that, described energy-storage battery comprises from the guipure pattern of carrying:When the source cut-off power supply of described photovoltaic power supply, the net outage of described city when described energy-storage battery can discharge through judgement, is independently described user load power supply by described energy-storage battery, wherein said photovoltaic bimodulus inverter is from adjusting output voltage, and described energy storage two way convertor is in the control of discharge state.
- 11. as the described photovoltaic of claim 1-10 any one from be incorporated into the power networks, city's net and energy storage mixed power supply system, it is characterized in that, also comprise central controller, described central controller is used for monitoring the real-time status of described each building block of electric power system, and judges and control the work at present pattern of described electric power system according to real-time status information.
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