CN109617129A - Suitable for grid-connected turn of off-grid seamless handover method of hybrid energy-storing all-in-one machine - Google Patents
Suitable for grid-connected turn of off-grid seamless handover method of hybrid energy-storing all-in-one machine Download PDFInfo
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- CN109617129A CN109617129A CN201811654492.0A CN201811654492A CN109617129A CN 109617129 A CN109617129 A CN 109617129A CN 201811654492 A CN201811654492 A CN 201811654492A CN 109617129 A CN109617129 A CN 109617129A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/40—Synchronising a generator for connection to a network or to another generator
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
- H02J9/062—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems for AC powered loads
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The present invention relates to one kind to be suitable for grid-connected turn of off-grid seamless handover method of hybrid energy-storing all-in-one machine, characterized in that the following steps are included: the real value for the network voltage that (1) calculates when will be grid-connected is as UPS voltage reference value；The electric current of load is measured as switching moment current reference initial value；(2) two phase-locked loop is used, the locking phase of network voltage, obtains grid phase in real time when phaselocked loop A is responsible for grid-connected；Phaselocked loop B is by the sine table of the phase real-time update phaselocked loop B of phaselocked loop A, for the linking preparation for cutting off net and doing phase grid-connected at any time；Meanwhile the frequency that phaselocked loop ring A is obtained will also become phaselocked loop B original frequency；(3) electric network state judges, once identification power grid is abnormal or loses, the output of grid-connected voltage outer ring is switched to the output of off-network outer voltage, is cut off netted as output.The present invention guarantees and voltage magnitude and frequency values are constant in off-network handoff procedure, avoids SPA sudden phase anomalies, realizes the seamless switching of load supplying.
Description
Technical field
The present invention relates to one kind to be suitable for grid-connected turn of off-grid seamless handover method of hybrid energy-storing all-in-one machine, belongs to electric power skill
Art field.
Background technique
Currently, photovoltaic energy storage electricity generation system can substantially be divided into: and off-network energy-storage system, off-network electricity generation system, grid-connected storage
It can system and various energy resources mixing micro-grid system.Wherein, and off-network integrated system has several working ways, has a variety of function
Can, there is greater advantage and great development space in energy-storage system.But hybrid energy-storing all-in-one machine uses in the prior art
And there are SPA sudden phase anomalies based on power grid three-phase voltage ideal sinusoidal, and when off-network switching mostly for off-network switching control strategy
Situation leads to not realize that the seamless switching to power to the load also reduces energy storage efficiency to influence system stability.
Summary of the invention
The purpose of the present invention is overcoming the deficiencies in the prior art, one kind is provided and is suitable for hybrid energy-storing all-in-one machine simultaneously
Net turns off-grid seamless handover method, guarantees and voltage magnitude and frequency values are constant in off-network handoff procedure, avoid SPA sudden phase anomalies,
Realize the seamless switching of load supplying.
It is described to be suitable for grid-connected turn of off-grid seamless switching of hybrid energy-storing all-in-one machine according to technical solution provided by the invention
Method, characterized in that the following steps are included:
(1) when being incorporated into the power networks, load supplying carries out energy and mutual between solar panel, battery and power grid；
According to and off-network inversion loop carry out the preparation of amplitude, the real value of the network voltage calculated when will be grid-connected is not as
The voltage reference value V of uninterruptible power mode UPSups_ref；Gone out by the sampling of load voltage and the sampled measurements of load current negative
The electric current UPSIdref of load prepares for uninterruptible power supply mode UPS state, as switching moment current reference initial value；
(2) two phase-locked loop is used, the locking phase of network voltage when phaselocked loop A is responsible for grid-connected obtains grid phase in real time,
Function when completing grid-connected；Phaselocked loop B is by the θ of the sine table of the phase real-time update phaselocked loop B of phaselocked loop Aups_ref, at any time
The grid-connected linking preparation for cutting off net and doing phase；Meanwhile the frequency that phaselocked loop ring A is obtained will also become phaselocked loop B original frequency
Fups_ref；
(3) electric network state judges, provides simultaneously off-network switching signal, once identification power grid is abnormal or loses, by grid-connected electricity
Pressure outer ring output switches to the output of off-network outer voltage, cuts off netted as output；
(4) when off-network state, solar panel and battery power to the load.
Further, in switching state, the switching of grid-connected voltage ring and off-network Voltage loop, electric current loop is constant, so that defeated
PWM can be continuous out.
Further, voltage magnitude remains unchanged in handoff procedure, to optimum value after switching completion；Frequency values are protected
Hold it is constant, switching complete after to optimum value.
Further, the off-grid theoretical real-time loop of output is calculated in the grid-connected stage, is not exported at this time to current inner loop,
When state by it is grid-connected be switched to off-network when, directly the value is exported to current inner loop.
Further, in switching state, hybrid energy-storing all-in-one machine is cut from grid-connected switching part relay status
It changes.
Further, described from grid-connected switching part includes relay RY1, relay RY2, relay RY3, relay
A terminal contacts of RY4, relay RY5, relay RY6, relay RY7 and relay RY8, relay RY5 connect DC/AC mould
Block, between relay RY5 and DC/AC module be arranged inverter current sampling A1, relay RY5 another terminal contacts connection after
A terminal contacts of electric appliance RY6, another terminal contacts of relay RY6 are separately connected a terminal contacts of relay RY1 and by negative
Current-carrying sampling A2 connection loads LOAD, a terminal contacts of another terminal contacts connection relay RY2 of relay RY1, relay
Another terminal contacts of device RY2 connect power grid GRID, and a terminal contacts of relay RY7 connect DC/AC module, and relay RY7's is another
A terminal contacts of one terminal contacts connection relay RY8, another terminal contacts of relay RY8 are separately connected relay RY3's
One terminal contacts and load LOAD, a terminal contacts of another terminal contacts adjunction relay RY4 of relay RY3, relay RY4's is another
One terminal contacts connect power grid GRID；In described another terminal contacts after condenser RY2 and another terminal contacts after condenser RY4
Between be arranged network voltage sampling V1, set between another terminal contacts of relay RY8 and another terminal contacts of relay RY6
Set the sampling V2 of load voltage.
The invention has the following advantages that when (1) present invention switches back and forth for grid-connected and off-network, proof load for electric energy
Enough seamless switchings；(2) voltage magnitude remains unchanged in handoff procedure, slowly to optimum value after the completion of switching；Frequency values
It remains unchanged, slowly to optimum value after the completion of switching；Phase does not mutate, and can be connected phase when power grid disconnects.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the hybrid energy-storing all-in-one machine.
Fig. 2 is the circuit diagram from grid-connected switching part.
Fig. 3 is the schematic diagram that grid connection state is in from grid-connected switching part.
Fig. 4 is the schematic diagram that off-network state is in from grid-connected switching part.
Fig. 5 is described and off-network inversion loop schematic diagram.
Fig. 6 is that described and off-network state switches schematic diagram.
Specific embodiment
Below with reference to specific attached drawing, the invention will be further described.
As shown in Figure 1, the hybrid energy-storing all-in-one machine includes from grid-connected switching part, boosting unit BOOST, DC/AC mould
Block, DC/DC module, battery BAT, solar panel PV and load LOAD；The boosting unit BOOST connection solar panel PV, boosting are single
Photovoltaic energy is sent to DC bus DC_BUS by first BOOST；The DC/AC module is DC/AC conversion module, DC/AC mould
Block when having power grid, is responsible for DC bus DC_BUS and electricity by connecting from grid-connected switching part with power grid GRID and load LOAD
Net the energy conversion between GRID, stable DC bus DC_BUS；When not having power grid, DC/AC module is responsible for supplying to load LOAD
Electricity, proof load LOAD operation；The DC/DC module is charge and discharge part, and DC/DC module is connect with battery BAT, in direct current mother
It is responsible between line DC_BUS and battery BAT to battery BAT charge and discharge.
It from grid-connected switching part include relay RY1, relay RY2, relay RY3, relay as shown in Fig. 2, described
A terminal contacts of RY4, relay RY5, relay RY6, relay RY7 and relay RY8, relay RY5 connect DC/AC mould
Block, between relay RY5 and DC/AC module be arranged inverter current sampling A1, relay RY5 another terminal contacts connection after
A terminal contacts of electric appliance RY6, another terminal contacts of relay RY6 are separately connected a terminal contacts of relay RY1 and by negative
Current-carrying sampling A2 connection loads LOAD, a terminal contacts of another terminal contacts connection relay RY2 of relay RY1, relay
Another terminal contacts of device RY2 connect power grid GRID, and a terminal contacts of relay RY7 connect DC/AC module, and relay RY7's is another
A terminal contacts of one terminal contacts connection relay RY8, another terminal contacts of relay RY8 are separately connected relay RY3's
One terminal contacts and load LOAD, a terminal contacts of another terminal contacts adjunction relay RY4 of relay RY3, relay RY4's is another
One terminal contacts connect power grid GRID；In described another terminal contacts after condenser RY2 and another terminal contacts after condenser RY4
Between be arranged network voltage sampling V1, set between another terminal contacts of relay RY8 and another terminal contacts of relay RY6
Set the sampling V2 of load voltage.
It is of the present invention to be suitable for grid-connected turn of off-grid seamless handover method of hybrid energy-storing all-in-one machine, comprising the following steps:
(1) as shown in figure 3, when grid-connected, the contact relay RY1~relay RY8 is closed, load LOAD power supply, electricity
Energy and mutual is carried out between pond plate PV, battery BAT and power grid GRID；
According to and off-network inversion loop carry out the preparation of amplitude, the real value of the network voltage calculated when will be grid-connected is not as
The voltage reference value V of uninterruptible power mode UPSups_ref；Pass through the sampling A2 measurement of the sampling V2 and load current of load voltage
The electric current UPSIdref loaded out prepares for uninterruptible power supply mode UPS state, as switching moment current reference initial value；
(2) as shown in fig. 6, using two phase-locked loop, the locking phase of network voltage when phaselocked loop A is responsible for grid-connected obtains in real time
Grid phase is taken, function when completing grid-connected；Phaselocked loop B is by the sine table of the phase real-time update phaselocked loop B of phaselocked loop A
θups_ref, for the linking preparation for cutting off net and doing phase grid-connected at any time；Meanwhile the frequency that phaselocked loop ring A is obtained will also become locking phase
Ring B original frequency Fups_ref；
(3) electric network state judges, provides simultaneously off-network switching signal, once identification power grid is abnormal or loses, current reference
The output of grid-connected voltage outer ring is switched to off-network outer voltage output (as shown in Figure 5) by selection switch, is cut off netted as output；
(4) as shown in figure 4, when being off-network state, solar panel PV and battery BAT power to load LOAD.
It is of the present invention to be suitable for grid-connected turn of off-grid seamless handover method of hybrid energy-storing all-in-one machine, in grid connection state,
Grid-connected voltage outer ring and current inner loop calculate, and obtain grid-connected duty ratio, realize grid-connected function, and load guarantees its work by power grid；
Off-network outer voltage is calculated according to bearing power simultaneously, and obtains the current inner loop reference value that off-network should theoretically export, but
It is that electric current loop will not choose the value at this time, only prepares to switch at any time；When grid connection state, mutually tracked using twin-lock, off-network
Locking phase also work simultaneously, it is ensured that and when leaving, can for it is grid-connected at any time cut off net and do the linking of phase prepare.Off-network state
When, off-network outer voltage and current inner loop calculate, and obtain grid-connected duty ratio, realize the function of off-network alternating voltage output；And it is
It is grid-connected to prepare, once recognizing power system restoration, the alternating voltage of off-network output and the sampling of market electricity are compared, adjustment one
It is again grid-connected after cause.In switching state, real-time judge electric network state, being divided into has power grid and without power grid, and when switching needs to switch
Two state-events: (1) switching of the state and loop that work, the switching of grid-connected voltage ring and off-network Voltage loop, electric current loop is not
Become, allows output PWM continuous；(2) from the switching of grid-connected switching part relay status.
The invention has the following advantages that when (1) present invention switches back and forth for grid-connected and off-network, proof load for electric energy
Enough seamless switchings；(2) voltage magnitude remains unchanged in handoff procedure, slowly to optimum value after the completion of switching；Frequency values
It remains unchanged, slowly to optimum value after the completion of switching；Phase does not mutate, and can be connected phase when power grid disconnects；
(3) present invention just calculates the off-grid theoretical real-time loop of output in the grid-connected stage, does not export really only to current inner loop,
When state by it is grid-connected be switched to off-network when, directly the value is exported to current inner loop.
Claims (6)
1. one kind is suitable for grid-connected turn of off-grid seamless handover method of hybrid energy-storing all-in-one machine, characterized in that the following steps are included:
(1) when being incorporated into the power networks, load supplying carries out energy and mutual between solar panel, battery and power grid；
According to and off-network inversion loop carry out the preparation of amplitude, the real value of the network voltage calculated when will be grid-connected is as uninterruptedly
The voltage reference value V of electric source modes UPSups_ref；Go out load by the sampling of load voltage and the sampled measurements of load current
Electric current UPSIdref prepares for uninterruptible power supply mode UPS state, as switching moment current reference initial value；
(2) two phase-locked loop is used, the locking phase of network voltage when phaselocked loop A is responsible for grid-connected obtains grid phase in real time, completes
Function when grid-connected；Phaselocked loop B is by the θ of the sine table of the phase real-time update phaselocked loop B of phaselocked loop Aups_ref, it is grid-connected at any time
Cut off the linking preparation that net does phase；Meanwhile the frequency that phaselocked loop ring A is obtained will also become phaselocked loop B original frequency Fups_ref；
(3) electric network state judges, provides and off-network switching signal will be outside grid-connected voltage once identification power grid is abnormal or loses
Ring output switches to the output of off-network outer voltage, cuts off netted as output；
(4) when off-network state, solar panel and battery power to the load.
2. it is suitable for grid-connected turn of off-grid seamless handover method of hybrid energy-storing all-in-one machine as described in claim 1, it is characterized in that:
In switching state, the switching of grid-connected voltage ring and off-network Voltage loop, electric current loop is constant, allows output PWM continuous.
3. it is suitable for grid-connected turn of off-grid seamless handover method of hybrid energy-storing all-in-one machine as described in claim 1, it is characterized in that:
Voltage magnitude remains unchanged in handoff procedure, to optimum value after switching completion；Frequency values remain unchanged, after the completion of switching
To optimum value.
4. it is suitable for grid-connected turn of off-grid seamless handover method of hybrid energy-storing all-in-one machine as described in claim 1, it is characterized in that:
The off-grid theoretical real-time loop of output is calculated in the grid-connected stage, is not exported at this time to current inner loop, to state by grid-connected switching
When to off-network, directly the value is exported to current inner loop.
5. it is suitable for grid-connected turn of off-grid seamless handover method of hybrid energy-storing all-in-one machine as described in claim 1, it is characterized in that:
In switching state, hybrid energy-storing all-in-one machine is switched over from grid-connected switching part relay status.
6. it is suitable for grid-connected turn of off-grid seamless handover method of hybrid energy-storing all-in-one machine as claimed in claim 5, it is characterized in that:
Described from grid-connected switching part includes relay RY1, relay RY2, relay RY3, relay RY4, relay RY5, relay
A terminal contacts of device RY6, relay RY7 and relay RY8, relay RY5 connect DC/AC module, in relay RY5 and DC/
The sampling A1 of inverter current is set between AC module, another terminal contacts of relay RY5 connect a terminal contacts of relay RY6,
Another terminal contacts of relay RY6 are separately connected a terminal contacts of relay RY1 and the sampling A2 connection by load current
LOAD, a terminal contacts of another terminal contacts connection relay RY2 of relay RY1 are loaded, another terminal contacts of relay RY2 connect
Get access to grid GRID, and a terminal contacts of relay RY7 connect DC/AC module, and another terminal contacts of relay RY7 connect relay
A terminal contacts of RY8, another terminal contacts of relay RY8 are separately connected a terminal contacts and load LOAD of relay RY3, after
Another terminal contacts of a terminal contacts of another terminal contacts adjunction relay RY4 of electric appliance RY3, relay RY4 connect power grid GRID；
Adopting for network voltage is set between described another terminal contacts after condenser RY2 and another terminal contacts after condenser RY4
The sampling V2 of load voltage is arranged in sample V1 between another terminal contacts of relay RY8 and another terminal contacts of relay RY6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811654492.0A CN109617129A (en) | 2018-12-13 | 2018-12-13 | Suitable for grid-connected turn of off-grid seamless handover method of hybrid energy-storing all-in-one machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811654492.0A CN109617129A (en) | 2018-12-13 | 2018-12-13 | Suitable for grid-connected turn of off-grid seamless handover method of hybrid energy-storing all-in-one machine |
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| CN109617129A true CN109617129A (en) | 2019-04-12 |
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| CN201811654492.0A Pending CN109617129A (en) | 2018-12-13 | 2018-12-13 | Suitable for grid-connected turn of off-grid seamless handover method of hybrid energy-storing all-in-one machine |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113131463A (en) * | 2021-03-23 | 2021-07-16 | 深圳市伊力科电源有限公司 | Switching method, system and device of bidirectional inverter and readable storage medium |
| WO2023236196A1 (en) * | 2022-06-10 | 2023-12-14 | 深圳市富兰瓦时技术有限公司 | Seamless on/off-grid switching method and household energy storage system |
-
2018
- 2018-12-13 CN CN201811654492.0A patent/CN109617129A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113131463A (en) * | 2021-03-23 | 2021-07-16 | 深圳市伊力科电源有限公司 | Switching method, system and device of bidirectional inverter and readable storage medium |
| WO2023236196A1 (en) * | 2022-06-10 | 2023-12-14 | 深圳市富兰瓦时技术有限公司 | Seamless on/off-grid switching method and household energy storage system |
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