CN108667114A - The control method of power supply system and power supply system - Google Patents

The control method of power supply system and power supply system Download PDF

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Publication number
CN108667114A
CN108667114A CN201710202549.2A CN201710202549A CN108667114A CN 108667114 A CN108667114 A CN 108667114A CN 201710202549 A CN201710202549 A CN 201710202549A CN 108667114 A CN108667114 A CN 108667114A
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CN
China
Prior art keywords
energy
photovoltaic cell
storage
power
load
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CN201710202549.2A
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Chinese (zh)
Inventor
尹韶文
孙嘉品
李程
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比亚迪股份有限公司
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Priority to CN201710202549.2A priority Critical patent/CN108667114A/en
Publication of CN108667114A publication Critical patent/CN108667114A/en

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Classifications

    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/381Dispersed generators
    • H02J3/382Dispersed generators the generators exploiting renewable energy
    • H02J3/383Solar energy, e.g. photovoltaic energy
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/34Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
    • H02J7/35Parallel operation in networks using both storage and other dc sources, e.g. providing buffering with light sensitive cells
    • Y02E10/566

Abstract

The invention discloses the control methods of a kind of power supply system and power supply system, power supply system includes photovoltaic cell group, energy-storage system, photovoltaic DC-to-AC converter and controller, photovoltaic cell group includes multiple photovoltaic cells, photovoltaic cell group is connected by the photovoltaic DC-to-AC converter and power grid or load, energy-storage system is connected in parallel with photovoltaic cell group, energy-storage system is connected by photovoltaic DC-to-AC converter and power grid or with load, and control method includes:Controller obtains control information, and controller controls at least one of photovoltaic cell group and energy-storage system to power grid or load supplying according to the control information.In such manner, it is possible to reduce the burden of power grid, the utilization rate of regenerative resource is improved.

Description

The control method of power supply system and power supply system

Technical field

The present invention relates to power electronics fields, the more particularly to control method and power supply system of power supply system.

Background technology

With the development of green regenerative energy sources, photovoltaic generation comes into being, but most of photovoltaic generation all concentrates on daytime, Extra photovoltaic energy can be wasted.

Existing photovoltaic power supply system uses photovoltaic cell(Photovoltaic, PV)Pass through inverter and bidirectional, dc Electricity-direct current(Direct current-direct current, DC-DC)Power grid or load are supplied after conversion.This mode Since the transfer capability of inverter is limited, and electric energy is converted twice by inverter and DC-DC, and the utilization rate of photovoltaic generation subtracts Small, decrease of power generation cannot be satisfied the demand of power grid and load-side.Moreover current existing new energy energy-storage system is mostly Power grid end stores, and product developing expense is high, although excess energy storage problem can be solved, also increases the burden of power grid simultaneously And risk.

It is how urgently to be resolved hurrily as photovoltaic industry at this stage efficiently using photovoltaic generation while reducing power grid burden Problem.

Invention content

The present invention proposes a kind of control method of power supply system and a kind of power supply system, can reduce the burden of power grid, and can be with Improve the utilization rate of regenerative resource.

The control method for the power supply system that embodiment proposes according to an aspect of the present invention, the power supply system include:Photovoltaic Battery pack, energy-storage system, photovoltaic DC-to-AC converter and controller, the photovoltaic cell group include N number of photovoltaic cell, and N is whole more than 1 Number, the photovoltaic cell group are connected by the photovoltaic DC-to-AC converter and power grid or load, the energy-storage system and the photovoltaic electric Pond group is connected in parallel, and the energy-storage system is connected by the photovoltaic DC-to-AC converter and the power grid or with the load, the control Method processed includes:The controller control at least one of the photovoltaic cell group and the energy-storage system to the power grid or The load supplying.

The control method of the power supply system proposed according to embodiments of the present invention, by increasing multiple photovoltaics in power supply system Battery fully absorbs regenerative resource, and energy-storage system is arranged in photovoltaic cell group side, and photovoltaic is controlled using controller Battery pack and/or energy-storage system are that power grid or load supplying improve the profit of regenerative resource so as to reduce the burden of power grid With rate.

The power supply system that embodiment proposes according to a further aspect of the invention, the power supply system include:Photovoltaic cell group, storage Energy system, photovoltaic DC-to-AC converter and controller, the photovoltaic cell group include N number of photovoltaic cell, and N is the integer more than 1;The light Battery pack is lied prostrate to connect by the photovoltaic DC-to-AC converter and power grid or load;The energy-storage system is in parallel with the photovoltaic cell group to be connected It connects, the energy-storage system is connected by the photovoltaic DC-to-AC converter and the power grid or with the load;The controller is for controlling At least one of the photovoltaic cell group and described energy-storage system are made to the power grid or the load supplying.

The power supply system proposed according to embodiments of the present invention can be again by increasing multiple photovoltaic cells in power supply system The raw energy fully absorbs, and energy-storage system is arranged in photovoltaic cell group side, using controller control photovoltaic cell group and/or Energy-storage system is that power grid or load supplying improve the utilization rate of regenerative resource so as to reduce the burden of power grid.

Description of the drawings

Fig. 1 is the schematic flow chart of the control method of power supply system according to an embodiment of the invention;

Fig. 2 is the schematic flow chart of the control method of power supply system according to another embodiment of the present invention;

Fig. 3 is the flow chart of the control method of power supply system in accordance with another embodiment of the present invention;

Fig. 4 is the block diagram of power supply system according to an embodiment of the invention;

Fig. 5 is the block diagram of power supply system according to another embodiment of the present invention;

Fig. 6 is the block diagram of power supply system according to another embodiment of the present invention.

Specific implementation mode

The embodiment of the present invention is described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein identical from beginning to end Or similar label indicates same or similar element or element with the same or similar functions.It is retouched below with reference to attached drawing The embodiment stated is exemplary, it is intended to for explaining the present invention, and is not considered as limiting the invention.

With reference to the accompanying drawings come describe the embodiment of the present invention power supply system control method and execute the control method Power supply system.

Fig. 1 is the flow chart of the control method of power supply system according to an embodiment of the invention.The method of Fig. 1 can be by The controller of power supply system is realized.Power supply system includes photovoltaic cell group, energy-storage system, photovoltaic DC-to-AC converter and controller, photovoltaic Battery pack includes N number of photovoltaic cell, and N is the integer more than 1, and photovoltaic cell group is connected by photovoltaic DC-to-AC converter and power grid or load It connects, energy-storage system is connected in parallel with photovoltaic cell group, and energy-storage system is connected by photovoltaic DC-to-AC converter and the power grid or with load.

The control method of the power supply system includes:

101, controller obtains control information.

102, controller controls at least one of photovoltaic cell group and energy-storage system to power grid or bears according to the control information Carry power supply.

The control method of the power supply system proposed according to embodiments of the present invention, by increasing multiple photovoltaics in power supply system Battery fully absorbs regenerative resource, and energy-storage system is arranged in photovoltaic cell group side, and photovoltaic is controlled using controller Battery pack and/or energy-storage system are that power grid or load supplying improve the profit of regenerative resource so as to reduce the burden of power grid With rate.

In one embodiment of the invention, controller can select photovoltaic cell group and energy-storage system according to the control information At least one of be power grid or load supplying.Control information can be the external control signal that controller receives, such as external What is directly inputted is applicable in the signal of photovoltaic cell group power supply.It can also be power generation of the controller according to photovoltaic cell group to control information Power and power grid or the demand power of load, selection are powered using photovoltaic cell group and/or energy-storage system.

The photovoltaic cell quantity in photovoltaic cell group in the application power supply system is more than 1, i.e. the application has increased photovoltaic newly Battery, such photovoltaic cell can fully absorb light energy, reduce the loss of light energy so that light energy obtains effective profit With.

By increasing multiple photovoltaic cells in the embodiment of the present application, photovoltaic energy is fully absorbed, meet be power grid or While load supplying, additionally it is possible to by more photovoltaic cell energy stores in energy-storage system, increase the energy storage of energy-storage battery Rate is power grid or load supplying in photovoltaic cell group energy deficiency, improves the utilization rate of regenerative resource.It can make in this way One timing of photovoltaic DC-to-AC converter power, increases accumulated generation amount.

Energy-storage battery is arranged using power grid as Coupling point, at power grid end in existing power supply system scheme, and electricity is stored at power grid end Amount, in this way, as electricity demand increases, the generating equipment of power grid and electrical equipment installed capacity will increase, and need to control Factor increases, while power grid burden can also aggravate, and power grid regulation difficulty increases, and disbursement also can accordingly increase.The application stores up Energy system is connected in parallel with photovoltaic cell group, and energy-storage system is arranged in photovoltaic cell group side, can reduce grid side in this way Burden, reduce expenditure.

In addition, photovoltaic cell is sequentially connected progress with inverter, DC-DC, load in existing power supply system off-network scheme The conversion of Current Voltage, due to the conversion power limited of inverter itself, which define the upper limit of the power of load end, Bu Nengchong Divide and meets the needs of loading high electricity.The photovoltaic cell group of the application includes multiple photovoltaic cells, and photovoltaic cell group passes through Photovoltaic DC-to-AC converter is connected with load, in addition, photovoltaic cell group is also connected by the energy-storage battery in bi-directional DC-DC and energy-storage system Connect, in this way by energy-storage battery powering load when, convertible power is no longer limited in circuit, can improve photovoltaic cell Utilization rate improves discharging efficiency.In the design of the application, multiple photovoltaic cells share a photovoltaic DC-to-AC converter, compared to simply It is further added by the Combination Design of one or more groups of photovoltaic cells, inverter, DC-DC, while meeting load power demand, moreover it is possible to Enough save component number.

Energy-storage system in the application include M energy-storage battery and with M two-way DC/DC, wherein M energy-storage battery is simultaneously Connection, M energy-storage battery are corresponded with M two-way DC/DC, and M is positive integer.Each energy-storage battery passes through two-way DC/DC and light Battery pack connection is lied prostrate, each energy-storage battery is also connected by photovoltaic DC-to-AC converter and power grid or load.In this way, by increasing multiple storages Energy battery so that the electricity of photovoltaic cell group stores electricity into energy-storage battery when supplying power grid or load still has residue, To be used when follow-up photovoltaic battery electric quantity deficiency.Multiple energy-storage batteries make memory capacity bigger, can improve light utilization Rate.

Further, by increasing multiple energy-storage batteries, more powerful photovoltaic DC-to-AC converter can be supported, can be prolonged in this way A length of power grid or the power-on time of load.

It should be understood that the embodiment of the present application can be applied in grid-connected or off-network, grid-connected or off-grid application scenarios are not done It limits, in other words, photovoltaic cell group and/or energy-storage system can be that power grid is powered, or load supplying.

Be described in detail with reference to the specific embodiment of Fig. 2 and Fig. 3 is that power grid or load select suitable power supply system Method.

Fig. 2 is the schematic flow chart of the control method of power supply system according to another embodiment of the present invention.The control of Fig. 2 Method can be realized by the controller of power supply system.Power supply system includes photovoltaic cell group, energy-storage system, photovoltaic DC-to-AC converter and control Device processed, photovoltaic cell group include N number of photovoltaic cell, and N is the integer more than 1, and photovoltaic cell group passes through photovoltaic DC-to-AC converter and power grid Or load connection, energy-storage system is connected in parallel with photovoltaic cell group, energy-storage system by photovoltaic DC-to-AC converter with the power grid or with Load connection.

The control method of the power supply system includes:

201, controller receives control signal.

It can be received from outside by controller to control signal, can also be by controller from photovoltaic cell group or power grid Or the receptions such as load obtain, the application is not construed as limiting this, as long as all existing for controlling to the signal of power grid or load supplying Within the protection domain of the application.

202, controller controls at least one of photovoltaic cell group and energy-storage system to power grid according to control signal or bears Carry power supply.

Power grid or load in the application can be individually powered by photovoltaic cell group, for example, solar energy abundance, That is the generated output of photovoltaic cell group is enough to provide the demand of load or power grid.At this point, when energy is discontented in energy-storage system, also Energy-storage battery charging of the photovoltaic cell group into energy-storage system can be controlled.

Power grid or load in the application can also individually be powered by energy-storage system.For example, in solar energy rainy days Deficiency, and when evening photovoltaic cell group depleted of energy, can individually be supplied to power grid or load by the energy-storage battery in energy-storage system Electricity.

The control method of the power supply system proposed according to embodiments of the present invention, by increasing multiple photovoltaics in power supply system Battery fully absorbs regenerative resource, and energy-storage system is arranged in photovoltaic cell group side, and photovoltaic is controlled using controller Battery pack and/or energy-storage system are that power grid or load supplying improve the profit of regenerative resource so as to reduce the burden of power grid With rate.

Can also be that power grid or load supply jointly by the energy-storage battery in photovoltaic cell group and energy-storage system in the application Electricity.For example, rainy days photovoltaic cell group energy be not enough to provide power grid or load needed for electrical demand when, can use storage Energy-storage battery in energy system is to power grid or load supplying, to supply power demands.

The specific side that power supply system how is selected according to generated output and power demand selection is illustrated with reference to Fig. 3 Method.

Fig. 3 is the flow chart of the control method of power supply system in accordance with another embodiment of the present invention.The control method of Fig. 3 It can be realized by the controller of power supply system.Power supply system includes photovoltaic cell group, energy-storage system, photovoltaic DC-to-AC converter and control Device, photovoltaic cell group include N number of photovoltaic cell, and N is the integer more than 1, photovoltaic cell group by photovoltaic DC-to-AC converter and power grid or Load connection, energy-storage system is connected in parallel with photovoltaic cell group, energy-storage system by photovoltaic DC-to-AC converter and the power grid or with bear Carry connection.

The control method of the power supply system includes:

301, controller obtains power grid or the demand power of load.

In one embodiment of the invention, controller can receive the demand work(of power grid or load that CT is detected Rate.

302, controller obtains the generated output of photovoltaic cell group.

In one embodiment of the invention, controller can receive the power generation work(for the photovoltaic cell group that CT is detected Rate.

Step 301 and 302 detects power by CT, it should be appreciated that and controller can also obtain power by other means, this Application is not construed as limiting this.

303, whether the generated output of photovoltaic cell group is less than power grid or the demand power of load.

The generated output of photovoltaic cell group is compared with the size of the demand power of grid side or load-side.

304, whether the generated output of photovoltaic cell group is zero.

If step 303 judges the generated output for obtaining photovoltaic cell and is less than the demand power of power grid or load, step into Row continues to judge whether the generated output of photovoltaic cell group is zero to 304.

305, it is power grid or load supplying that controller, which controls the energy-storage battery in energy-storage system,.

If 303 generated outputs for obtaining photovoltaic cell group are less than power grid or the demand power of load, continue 304 and obtain light The generated output for lying prostrate battery pack is zero, at this moment the energy-storage battery in energy-storage system can only be used to power grid or load supplying.

306, controller controls the energy-storage battery in photovoltaic cell group and energy-storage system simultaneously to power grid or load supplying.

If 303 generated outputs for obtaining photovoltaic cell group are less than power grid or the demand power of load, and 304 obtain light The generated output of volt battery pack is not zero, and at this moment photovoltaic cell group is not enough to provide enough electricity to power grid or load supplying, By the energy-storage battery in energy-storage system power supply, energy-storage battery electric discharge can be supplied to power grid or load.

307, whether the generated output of photovoltaic cell group is equal to power grid or the demand power of load.

If step 303 judges to obtain the generated output of photovoltaic cell not less than power grid or the demand power of load, step Proceed to 307, continues to judge whether the generated output of photovoltaic cell group is equal to power grid or the demand power of load.

308, controller controls photovoltaic cell group to power grid or load supplying.

If 303 obtain the generated output of photovoltaic cell group not less than power grid or the demand power of load, continues 307 and obtain The generated output of photovoltaic cell group is equal to power grid or the demand power of load, at this moment individually to power grid or is born using photovoltaic cell group Carry power supply.

309, controller controls the energy-storage battery in photovoltaic cell and energy-storage system simultaneously to power grid or load supplying.Into one Step ground, controller can control photovoltaic cell group to charge to the energy-storage battery in energy-storage system.

If 303 obtain the generated output of photovoltaic cell group not less than power grid or the demand power of load, continues 307 and obtain At this moment the generated output of photovoltaic cell group feeds to power grid using photovoltaic cell group or bears not equal to power grid or the demand power of load Power supply is carried, photovoltaic cell group power still has residue, controller that photovoltaic cell group can control to be filled to the energy-storage battery in energy-storage system Electricity.

It should be understood that the energy-storage battery in energy-storage system in the application can be charged by photovoltaic cell group, it can also It is to be charged to energy-storage battery using extraneous other modes, in case photovoltaic when photovoltaic cell group undercharge is with meet demand When battery pack is to load or power grid electricity shortage, power supply is supplied using energy-storage battery.

It should be understood that the application can detect the demand power of the generated output of photovoltaic battery pack, power grid or load, it can also Other parameters such as electricity are detected, every parameter related with charge-discharge power demand is all within the protection domain of the application.

The signal of the corresponding control method of power supply system of the embodiment of the present application is described in detail above in association with Fig. 1 to Fig. 3 Property flow chart, the schematic block diagram of the power supply system of the embodiment of the present application is described in detail with reference to fig. 4 to fig. 6.

Fig. 4 is the schematic block diagram of power supply system according to an embodiment of the invention.The power supply system of the embodiment of the present invention System includes photovoltaic cell group 11, energy-storage system 12, photovoltaic DC-to-AC converter 13 and controller 15, and photovoltaic cell group includes N number of photovoltaic electric Pond, N are the integer more than 1, and photovoltaic cell group is connected by photovoltaic DC-to-AC converter and power grid or load, states energy-storage system and photovoltaic electric Pond group is connected in parallel, and energy-storage system is connected by photovoltaic DC-to-AC converter and power grid or with load.Controller controls information for obtaining, And control at least one of photovoltaic cell group and the energy-storage system is supplied to the power grid or the load according to the control information Electricity.

Power supply system in the embodiment of the present invention can be used for powering to power grid 14 under simultaneously net state, it is also possible in off-network Give load 14 power supply under state.

The power supply system proposed according to embodiments of the present invention can be again by increasing multiple photovoltaic cells in power supply system The raw energy fully absorbs, and energy-storage system is arranged in photovoltaic cell group side, using controller control photovoltaic cell group and/or Energy-storage system is that power grid or load supplying reduce the dependence to power grid so as to reduce the burden of power grid, improves renewable energy The utilization rate in source.

Control information in the embodiment of the present invention can be the external control signal that controller receives, such as external directly defeated What is entered is applicable in the signal of photovoltaic cell group power supply.Controller can receive control signal at this time, and control light according to control signal At least one of battery pack and energy-storage system are lied prostrate to power grid or load supplying.For example, control signal only control energy-storage system with When power grid or load are connected, the energy-storage battery in energy-storage system can be utilized to power grid or load supplying.

Control information can also be controller according to the generated output and power grid of photovoltaic cell group or the demand work(of load Rate, selection are powered using photovoltaic cell group and/or energy-storage system.Controller can be used for obtaining the demand of power grid or load at this time Power, and the generated output of photovoltaic cell group is obtained, according to power grid or the demand power of the load, and according to photovoltaic cell The generated output of group controls at least one of photovoltaic cell group and energy-storage system to power grid or load supplying.

In one embodiment of the invention, current transformer can be utilized(Current transformer, CT)Detection Power can detect the demand power of load using the demand power or CT that detect power grid using CT.In addition, CT can also be used To detect the generated output of photovoltaic battery pack.

In addition, photovoltaic cell is sequentially connected progress with inverter, DC-DC, load in existing power supply system off-network scheme The conversion of Current Voltage, due to the conversion power limited of inverter itself, which define the upper limit of the power of load end, Bu Nengchong Divide and meets loading demand.The photovoltaic cell group of the application includes multiple photovoltaic cells, and photovoltaic cell group passes through photovoltaic inversion Device is connected with load, in addition, photovoltaic cell group is also connect by bi-directional DC-DC with the energy-storage battery in energy-storage system, it is logical in this way When crossing energy-storage battery powering load, convertible power is no longer limited in circuit, can improve the utilization rate of photovoltaic cell, carry High discharging efficiency.

Energy-storage system in the application include M energy-storage battery and with M two-way DC/DC, wherein M energy-storage battery is simultaneously Connection, M energy-storage battery are corresponded with M two-way DC/DC, and M is positive integer.Each energy-storage battery passes through two-way DC/DC and light Battery pack connection is lied prostrate, each energy-storage battery is also connected by photovoltaic DC-to-AC converter and power grid or load.In this way, by increasing multiple storages Energy battery so that the electricity of photovoltaic cell group stores electricity into energy-storage battery when supplying power grid or load still has residue, To be used when follow-up photovoltaic battery electric quantity deficiency.Multiple energy-storage batteries make memory capacity bigger, reduce to energy-storage battery Capacity requirement, light utilization efficiency can also be improved.

In one embodiment of the invention, if the generated output of photovoltaic cell is zero, photovoltaic cell group controller can For controlling the energy-storage battery in energy-storage system to power grid or load supplying.

If the generated output of photovoltaic cell group is not zero, and the power of photovoltaic cell is less than power grid or the demand work(of load Rate, the energy-storage battery that controller is used to control in photovoltaic cell group and energy-storage system are supplied to power grid or load simultaneously.

If the power of photovoltaic cell group is equal to power grid or the demand power of load, controller disconnects energy storage system for controlling Connection between system and photovoltaic DC-to-AC converter, and photovoltaic cell group is controlled to power grid or load supplying.

If the power of photovoltaic cell group is more than power grid or the demand power of load, controller is for controlling photovoltaic cell group To power grid or load supplying.In addition, controller is additionally operable to when the power of photovoltaic cell is more than the demand power of power grid or load, Photovoltaic cell is controlled to charge to the energy-storage battery in energy-storage system.

The controller in power supply system in the embodiment of the present invention can execute the method in Fig. 1 to Fig. 3 flow charts, to keep away Exempt to repeat, this is no longer going to repeat them.

Fig. 5 is the block diagram of power supply system according to another embodiment of the present invention.

Here it is illustrated for grid-connected.The power supply system of Fig. 5 include multiple PV cell plate groups at photovoltaic Battery pack, energy-storage system, bi-directional DC-DC, photovoltaic DC-to-AC converter, power grid.Photovoltaic cell group is connected by photovoltaic DC-to-AC converter and power grid It connects.Energy-storage system is connected by bi-directional DC-DC, photovoltaic DC-to-AC converter and power grid.Bi-directional DC-DC circuit diagram is as shown in the figure.Two-way DC- The bi-directional conversion between high direct voltage-DC low-voltage may be implemented in DC.Inductance L is used to renew electric energy for boost or depressurization.Switch K1, K2 are boost or depressurization switch control.When photovoltaic cell group not enough power supply is to be supplied to power grid to power, in energy-storage system Energy-storage battery can supply power supply, energy-storage battery electric discharge to power grid.Photovoltaic cell group electricity is enough to provide powers to power grid, and has When remaining, photovoltaic cell group can also give the energy-storage battery charging in energy-storage system.

Fig. 6 is the block diagram of power supply system according to another embodiment of the present invention.Fig. 6 is supplied with power supply system to load It is illustrated for the off-network state of electricity.Power supply system photovoltaic cell group, the DC-AC of Fig. 6(Direct Current - Alternating Current, DC/AC)Inverter, current sampling module, voltage sample module, two-way DC/DC, voltage sample Module, voltage and current sample module, energy-storage battery and battery manager, battery manager can be the controller in Fig. 4.

Photovoltaic cell group can be connected by DC/AC inverters and load.Current sampling module is for acquiring DC/AC inversions The electric current of device DC side, and to two-way DC/DC transmit sampled result so that two-way DC/DC control voltage and current output, Meet load to use.Photovoltaic cell group is connect by two-way DC/DC with energy-storage battery and battery manager.Voltage sample module is used In acquisition photovoltaic cell group voltage, and to two-way DC/DC transmit sampled result so that two-way DC/DC follow photovoltaic cell Group voltage output, and two-way DC/DC is protected to cause to damage because of overvoltage.Voltage and current acquisition module can be used for acquiring energy storage electricity The performance number calculated according to sampled result is transferred to two-way DC/DC by the electric current and voltage in pond so that DC/DC charging or Electric discharge.Relay 1 is battery relay, the connection for controlling energy-storage battery and two-way DC/DC.

In addition, term " first ", " second " are used for description purposes only, it is not understood to indicate or imply relative importance Or implicitly indicate the quantity of indicated technical characteristic.Define " first " as a result, the feature of " second " can be expressed or Implicitly include at least one this feature.In the description of the present invention, the meaning of " plurality " is at least two, such as two, three It is a etc., unless otherwise specifically defined.

In the present invention unless specifically defined or limited otherwise, term " installation ", " connected ", " connection ", " fixation " etc. Term shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integral;Can be that machinery connects It connects, can also be electrical connection;It can be directly connected, can also can be indirectly connected through an intermediary in two elements The interaction relationship of the connection in portion or two elements, unless otherwise restricted clearly.For those of ordinary skill in the art For, the specific meanings of the above terms in the present invention can be understood according to specific conditions.

In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show The description of example " or " some examples " etc. means specific features, structure, material or spy described in conjunction with this embodiment or example Point is included at least one embodiment or example of the invention.In the present specification, schematic expression of the above terms are not It must be directed to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be in office It can be combined in any suitable manner in one or more embodiments or example.In addition, without conflicting with each other, the skill of this field Art personnel can tie the feature of different embodiments or examples described in this specification and different embodiments or examples It closes and combines.

Although the embodiments of the present invention has been shown and described above, it is to be understood that above-described embodiment is example Property, it is not considered as limiting the invention, those skilled in the art within the scope of the invention can be to above-mentioned Embodiment is changed, changes, replacing and modification.

Claims (14)

1. a kind of control method of power supply system, which is characterized in that the power supply system includes:Photovoltaic cell group, energy-storage system, Photovoltaic DC-to-AC converter and controller, the photovoltaic cell group include N number of photovoltaic cell, and N is the integer more than 1, the photovoltaic cell Group is connected by the photovoltaic DC-to-AC converter and power grid or load, and the energy-storage system is connected in parallel with the photovoltaic cell group, institute Energy-storage system is stated to connect by the photovoltaic DC-to-AC converter and the power grid or with the load;
The control method includes:
The controller obtains control information;
The controller according to the control information control at least one of the photovoltaic cell group and the energy-storage system to The power grid or the load supplying.
2. control method as described in claim 1, which is characterized in that the energy-storage system includes that M energy-storage battery and M are double To direct current-direct current DC/DC, the M energy-storage battery is in parallel, the M energy-storage battery and the M two-way DC/DC mono- One corresponds to, and M is positive integer, and each energy-storage battery is connect by the two-way DC/DC with the photovoltaic cell group, each energy storage electricity Pond is also connected by the photovoltaic DC-to-AC converter and the power grid or the load.
3. the control method of power supply system as claimed in claim 1 or 2, which is characterized in that the control information is believed in order to control Number,
Wherein,
The controller obtains control information:
The controller receives control signal;
The controller according to the control information control at least one of the photovoltaic cell group and the energy-storage system to The power grid or the load supplying include:
The controller according to the control signal control at least one of the photovoltaic cell group and the energy-storage system to The power grid or the load supplying.
4. control method as claimed in claim 1 or 2, which is characterized in that the controller obtains control information and includes:
The controller obtains the power grid or the demand power of the load;
The controller obtains the generated output of the photovoltaic cell group;
Wherein,
The controller according to the control information control at least one of the photovoltaic cell group and the energy-storage system to The power grid or the load supplying include:
The controller is according to the power grid or the demand power of the load, and according to the power generation work(of the photovoltaic cell group Rate controls at least one of the photovoltaic cell group and described energy-storage system to the power grid or the load supplying.
5. control method as claimed in claim 4, which is characterized in that the power supply system further includes Current Transmit,
Wherein,
The controller obtains the power grid or the demand power of the load includes:The controller receives what CT was detected The power grid or the demand power of the load;
The generated output that the controller obtains the photovoltaic cell group includes:Controller receive the CT detect it is described The generated output of photovoltaic cell group.
6. control method as described in claim 4 or 5, which is characterized in that the method further includes:
When the power of the photovoltaic cell is more than the demand power of the power grid or the load, the second switch group is controlled Part controls the photovoltaic cell to the energy-storage battery charging in the energy-storage system.
7. control method as described in claim 4 or 5, which is characterized in that the method further includes:
If the generated output of the photovoltaic cell is zero, the controller controls the energy-storage battery in the energy-storage system to institute State power grid or the load supplying;
If the generated output of the photovoltaic cell is not zero, and the power of the photovoltaic cell is less than the power grid or described negative The demand power of load, the controller control the energy-storage battery in the photovoltaic cell group and the energy-storage system simultaneously to described Power grid or the load supplying;
If the power of the photovoltaic cell is equal to the power grid or the demand power of the load, the controller control disconnects Connection between the energy-storage system and the photovoltaic DC-to-AC converter, and the photovoltaic cell is controlled to the power grid or the load Power supply;
If the power of the photovoltaic cell is more than the demand power of the power grid or the load, described in the controller control Photovoltaic cell is to the power grid or the load supplying.
8. a kind of power supply system, which is characterized in that the power supply system includes:Photovoltaic cell group, energy-storage system, photovoltaic DC-to-AC converter And controller, the photovoltaic cell group include N number of photovoltaic cell, N is the integer more than 1;
The photovoltaic cell group is connected by the photovoltaic DC-to-AC converter and power grid or load;
The energy-storage system is connected in parallel with the photovoltaic cell group, the energy-storage system by the photovoltaic DC-to-AC converter with it is described Power grid is connected with the load;
The controller controls the photovoltaic cell group and the energy storage for obtaining control information, and according to the control information At least one of system is to the power grid or the load supplying.
9. power supply system as claimed in claim 8, which is characterized in that the energy-storage system include M energy-storage battery and with M Two-way DC/DC, the M energy-storage battery is in parallel, and the M energy-storage battery is corresponded with the M two-way DC/DC, and M is Positive integer, each energy-storage battery are connect by the two-way DC/DC with the photovoltaic cell group, and each energy-storage battery also passes through institute Photovoltaic DC-to-AC converter is stated to connect with the power grid or the load.
10. power supply system as claimed in claim 8 or 9, which is characterized in that control information signal in order to control, the control Device processed controls in the photovoltaic cell group and the energy-storage system extremely for obtaining control information according to the control information Few one includes to the power grid or the load supplying:
The controller receives control signal, and controls the photovoltaic cell group and the energy-storage system according to the control signal At least one of to the power grid or the load supplying.
11. power supply system as claimed in claim 8 or 9, which is characterized in that the controller be additionally operable to obtain the power grid or The demand power of the load, and the generated output of the photovoltaic cell group is obtained, according to the power grid or the need of the load Power is sought, and according to the generated output of the photovoltaic cell group, is controlled in the photovoltaic cell group and the energy-storage system It is at least one to the power grid or the load supplying.
12. power supply system as claimed in claim 11, which is characterized in that the power supply system further includes CT, and the CT is used for The power grid or the demand power of the load are detected, the CT is additionally operable to detect the generated output of the photovoltaic cell group.
13. the power supply system as described in claim 11 or 12, which is characterized in that the controller is additionally operable in the photovoltaic electric When the power in pond is more than the power grid or the demand power of the load, the photovoltaic cell is controlled in the energy-storage system Energy-storage battery charges.
14. the power supply system as described in claim 11 or 12, which is characterized in that
If the generated output of the photovoltaic cell group is zero, the controller is used to control the energy storage electricity in the energy-storage system Pond is to the power grid or the load supplying;
If the generated output of the photovoltaic cell group is not zero, and the power of the photovoltaic cell group is less than the power grid or institute The demand power of load is stated, the energy-storage battery that the controller is used to control in the photovoltaic cell group and the energy-storage system is same When to the power grid or the load supplying;
If the generated output of the photovoltaic cell group is equal to the power grid or the demand power of the load, the controller is used The connection between the energy-storage system and the photovoltaic DC-to-AC converter is disconnected in control, and controls the photovoltaic cell group to the electricity Net or the load supplying;
If the generated output of the photovoltaic cell group is more than the power grid or the demand power of the load, the controller is used In controlling the photovoltaic cell group to the power grid or the load supplying.
CN201710202549.2A 2017-03-30 2017-03-30 The control method of power supply system and power supply system CN108667114A (en)

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PCT/CN2018/077537 WO2018177062A1 (en) 2017-03-30 2018-02-28 Power supply system and control method for power supply system

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CN106301208A (en) * 2015-05-26 2017-01-04 比亚迪股份有限公司 Solar energy storage system and the control method of solar energy storage system
CN207677451U (en) * 2018-01-08 2018-07-31 三峡大学 A kind of piconet networking system suitable for high-power wind turbine consumption

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Publication number Priority date Publication date Assignee Title
CN201234223Y (en) * 2008-07-01 2009-05-06 比亚迪股份有限公司 Solar power supply apparatus
CN103283107A (en) * 2010-12-28 2013-09-04 松下电器产业株式会社 Power controller
CN201947047U (en) * 2010-12-30 2011-08-24 比亚迪股份有限公司 Power supply system for power grid
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