CN106487000A - A kind of DC distribution netting twine road voltage control method based on energy storage - Google Patents
A kind of DC distribution netting twine road voltage control method based on energy storage Download PDFInfo
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- CN106487000A CN106487000A CN201610938286.7A CN201610938286A CN106487000A CN 106487000 A CN106487000 A CN 106487000A CN 201610938286 A CN201610938286 A CN 201610938286A CN 106487000 A CN106487000 A CN 106487000A
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- battery
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- current
- energy storage
- control method
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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
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
- H02J1/10—Parallel operation of dc sources
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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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
- H02J7/345—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering using capacitors as storage or buffering devices
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The present invention relates to circuit voltage control method in a kind of DC distribution net based on energy storage, belongs to DC distribution net voltage control field.DC load and the extensive application of distributed power source, by judging the size of load and distributed power source change in DC distribution net, principle of optimality is distributed according to line voltage distribution, energy storage is accessed to stablize line voltage distribution in certain point in the line, and the communication for setting up energy storage with grid entry point is to change the charging and discharging state of energy storage.Method proposed by the present invention is simple, effective and operable, changes the converter control method of constant grid-connected point voltage in Traditional control pattern；Reduce running wastage；Improve AC line voltage qualification rate；And then reliable access and system stable operation under load and distributed power source situation of change has been effectively ensured.
Description
Technical field
The present invention relates to circuit mid-point voltage stable state controls in a kind of direct-flow distribution system, more specifically to a kind of base
DC distribution netting twine road voltage control method in energy storage.
Background technology
With the development of modern power systems, the quantity of distributed energy and DC load increases year by year, and power electronics
Technology development also cause high efficiency DC distribution net turn possibility into.Therefore DC distribution net has good feasibility
And application prospect.But load and power distribution complexity, different sizes, close to improve system neutral road voltage in DC distribution net
Lattice rate, changes the way that AC/DC current transformer DC bus-bar voltage is maintained merely certain steady state value, makes the control of connection current transformer more
Meet special scenes, effectively optimize AC line voltage distribution, single-point communication that need to be by AC/DC current transformer with energy storage has been coordinated
Become.Therefore, in the case of consideration energy storage charging and discharging state, the trend to grid entry point control effectively, and reasonable adjusting is grid-connected
Point output power.The present invention proposes a kind of DC distribution netting twine road voltage control method based on energy storage.
Content of the invention
This is for overcoming the defect in prior art, it is an object of the invention to provide a kind of DC distribution net that is applied to is according to storage
Control method, i.e. the DC distribution netting twine road based on energy storage that line voltage distribution distribution situation improves system voltage qualification rate can be changed
Voltage control method, can realize line voltage distribution distribution further well, improve quality of voltage.
As follows for technical scheme：A kind of DC distribution net line voltage distribution controlling party based on grid entry point trend
Method, the method comprising the steps of：
Step 1：Set up DC distribution net non-uniform Distribution load or power source model；
Step 2：Battery is accessed, and ensures that its AC/DC current transformer exit potential is stable in circuit rated voltage UN；
Step 3：Accumulator electric-quantity is judged whether in normal range of operation, the accumulator electric-quantity is in normal range of operation
Interior, enter step 4；The battery accumulator electric-quantity enters step 5 not in normal range of operation, then；
Step 4：Judge accumulator cell charging and discharging electric current IbWhether it is zero, the accumulator cell charging and discharging electric current IbIt is for zero, then protects
Hold grid entry point value and power reference constant；The accumulator cell charging and discharging electric current IbIt is not zero, then enters step 5；
Step 5：Calculate grid-connected point voltage and anti-to grid entry point, communicated by single-point of the battery with AC/DC current transformer, change
Grid entry point value and power reference, gives accumulator cell charging and discharging on request.
In abovementioned steps 1, DC distribution net load or power distribution are complicated, it is difficult to consider, can be uniform according to circuit by which
Distribution is analyzed, i.e., the load on unit length circuit or power supply are divided equally, but load or power supply non-uniform Distribution in practice,
Therefore any point additional load or power supply can be added in the line, artificially manufactures non-uniform Distribution；Using battery purpose it is
For stablizing line voltage distribution, line voltage distribution is made for rated voltage, even if load or the uneven voltage deviation of power supply can also reduce, with negative
As a example by load, power conditions are similar with load.
In abovementioned steps 2, it is to meet line voltage distribution distribution optimization, the battery passes through AC/ when DC line is accessed
DC current transformer, as the access of battery has many restrictions, AC/DC current transformer is used for controlling the discharge and recharge of battery and voltage electricity
Stream.AC/DC current transformer adopts Buck/Boost step-up/step-down circuit, and voltage and current double closed-loop carries out voltage stabilizing Current limited Control.Using storage
Battery purpose is that it is rated voltage to make line voltage distribution, even if load or the uneven voltage deviation of power supply in order to stablize line voltage distribution
Can reduce.
In abovementioned steps 3, the state-of-charge of the battery accumulator electric-quantity battery is characterized, and state-of-charge need to be one
Determine in scope, the unstable discharge and recharge of battery can be otherwise caused, affect battery life.Be provided with grid entry point for battery electric quantity and
The detection means of electric current, detection battery electric quantity whether in acceptability limit, the size of electric current and direction.
In step (5), the energy storage of employing is communicated with the single-point of grid entry point, if battery is controlled using constant voltage,
AC/DC current transformer adopts power limitation control.If pressure discharge and recharge measure do not taken by battery, the change of battery current is represented
The situation of change of system load.
If original state battery current is 0, then when discharge current increases, load becomes big.By AC/DC current transformer and storage
The single-ended communication of battery, it is possible to increase AC/DC current transformer power output so that battery current is returned near 0.
If battery reaches discharge and recharge upper lower limit value, the power set-point of forcibly changing AC/DC current transformer is needed, so that battery
Carry out reasonable discharge and recharge.
The present invention changes the converter control method of constant grid-connected point voltage in Traditional control pattern；Reduce operation to damage
Consumption；Improve AC line voltage qualification rate；And then being abutted against under load and distributed power source situation of change has been effectively ensured
Enter and system stable operation.
Description of the drawings
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
Accompanying drawing to be used needed for technology description is had to be briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, acceptable
Other accompanying drawings are obtained according to these accompanying drawings.
Line voltage distribution control flow chart of the Fig. 1 based on energy storage.
Fig. 2 battery and AC/DC current transformer single-point Communication Model.
Fig. 3 battery charging and discharging cyclic process.
The grid-connected AC/DC current transformer control block diagram of Fig. 4.
1 battery current of table and grid-connected changed power corresponding relation.
Specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described, it is clear that described embodiment is only a part of embodiment of the present invention, rather than whole embodiments.It is based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under the premise of creative work is not made
Embodiment, belongs to the scope of protection of the invention.
Referring to Fig. 1 to Fig. 4, a kind of DC distribution netting twine road voltage control method based on energy storage of the present embodiment, can enter
One step realizes line voltage distribution distribution well, improves quality of voltage.It is an object of the invention to provide a kind of direct current based on energy storage is joined
Power network line voltage control method, can realize line voltage distribution distribution further well, improve quality of voltage.One kind is based on grid entry point
The DC distribution netting twine road voltage control method of trend, the method comprising the steps of：
Step 1：Set up DC distribution net non-uniform Distribution load or power source model；DC distribution net load or power distribution
Complexity, it is difficult to consider, can be uniformly distributed which according to circuit and be analyzed, i.e. load on unit length circuit or power supply are equal
Point, but load or power supply non-uniform Distribution in practice, therefore any point can add additional load or power supply, people in the line
For manufacturing non-uniform Distribution；It is that it is rated voltage to make line voltage distribution, even if load in order to stablize line voltage distribution using battery purpose
Or the uneven voltage deviation of power supply can also reduce, by taking load as an example, as shown in Fig. 2 power conditions are similar with load.
Step 2：Battery is accessed, and ensures that its AC/DC current transformer exit potential is stable in circuit rated voltage UN；Described
Battery passes through AC/DC current transformer when DC line is accessed, and AC/DC current transformer adopts Buck/Boost step-up/step-down circuit, AC/
DC current transformer is used for controlling discharge and recharge and the voltage x current of battery, and the voltage x current carries out voltage stabilizing limit using double-closed-loop control
Stream.
Step 3：Accumulator electric-quantity is judged whether in normal range of operation, the accumulator electric-quantity is in normal range of operation
Interior, enter step 4；The battery accumulator electric-quantity enters step 5 not in normal range of operation, then；The battery stores
The state-of-charge of battery electric quantity battery is characterized, and state-of-charge needs within the specific limits, can otherwise cause the unstable of battery
Discharge and recharge, affects battery life.The detection means being provided with grid entry point for battery electric quantity and electric current, whether detection battery electric quantity
In acceptability limit, the size of electric current and direction.
Step 4：Judge accumulator cell charging and discharging electric current IbWhether it is zero, the accumulator cell charging and discharging electric current IbIt is for zero, then protects
Hold grid entry point value and power reference constant；The accumulator cell charging and discharging electric current IbIt is not zero, then enters step 5；
Step 5：Calculate grid-connected point voltage and anti-to grid entry point, communicated by single-point of the battery with AC/DC current transformer, change
Grid entry point value and power reference, gives accumulator cell charging and discharging on request.
In step (5), the energy storage of employing is communicated with the single-point of grid entry point, if as shown in Fig. 2 battery is using permanent electricity
Voltage-controlled system, then AC/DC current transformer adopt power limitation control.If pressure discharge and recharge measure do not taken by battery, battery current
Change represents the situation of change of system load.
If original state battery current is 0, then when discharge current increases, load becomes big.By AC/DC current transformer and storage
The single-ended communication of battery, it is possible to increase AC/DC current transformer power output so that battery current is returned near 0.Battery current changes
1 is shown in Table with the action situation of corresponding AC/DC current transformer.
| \ | |Ib| increase | |Ib| reduce |
| Ib＞ 0 | AC/DC current transformer power increases | AC/DC current transformer power reduction |
| Ib＜ 0 | AC/DC current transformer power reduction | AC/DC current transformer power increases |
1 battery current of table and grid-connected changed power corresponding relation
If battery reaches discharge and recharge upper lower limit value, the power set-point of forcibly changing AC/DC current transformer is needed, so that battery
Carry out reasonable discharge and recharge.Power and voltage change such as Fig. 3 when battery charging and discharging is circulated.
The present invention changes the converter control method of constant grid-connected point voltage in Traditional control pattern；Reduce operation to damage
Consumption；Improve AC line voltage qualification rate；And then being abutted against under load and distributed power source situation of change has been effectively ensured
Enter and system stable operation.
The foregoing description of the disclosed embodiments, enables professional and technical personnel in the field to realize or uses the present invention.
Multiple modifications to these embodiments will be apparent for those skilled in the art, as defined herein
General Principle can be realized without departing from the spirit or scope of the present invention in other embodiments.Therefore, the present invention
The embodiments shown herein is not intended to be limited to, and is to fit to and principles disclosed herein and features of novelty phase one
The most wide scope for causing.
Claims (7)
1. a kind of DC distribution netting twine road voltage control method based on energy storage, the method comprising the steps of：
Step 1：Set up DC distribution net non-uniform Distribution load or power source model；
Step 2：Battery is accessed, and ensures that its AC/DC current transformer exit potential is stable in circuit rated voltage UN；
Step 3：Judge accumulator electric-quantity whether in normal range of operation, the accumulator electric-quantity in normal range of operation,
Enter step 4；The battery accumulator electric-quantity enters step 5 not in normal range of operation, then；
Step 4：Judge accumulator cell charging and discharging electric current IbWhether it is zero, the accumulator cell charging and discharging electric current IbIt is for zero, then keeps simultaneously
Site value and power reference is constant；The accumulator cell charging and discharging electric current IbIt is not zero, then enters step 5；
Step 5：Calculate grid-connected point voltage and anti-to grid entry point, communicated by single-point of the battery with AC/DC current transformer, change simultaneously
Site value and power reference is to accumulator cell charging and discharging.
2. a kind of DC distribution netting twine road voltage control method based on energy storage according to claim 1, it is characterised in that
In step (1), DC distribution net non-uniform Distribution load or power source model, as follows：Electrical network is according to any point in circuit
Add additional load or power supply, manufacture load or power supply non-uniform Distribution.
3. a kind of DC distribution netting twine road voltage control method based on energy storage according to claim 1, it is characterised in that
In step (2), the battery passes through AC/DC current transformer when DC line is accessed.
4. a kind of DC distribution netting twine road voltage control method based on energy storage according to claim 3, it is characterised in that
The AC/DC current transformer adopt Buck/Boost step-up/step-down circuit, the AC/DC current transformer be used for control battery discharge and recharge and
Voltage x current, the voltage x current carry out voltage stabilizing current limliting using double-closed-loop control.
5. a kind of DC distribution netting twine road voltage control method based on energy storage according to claim 1, it is characterised in that
In step (3), the state-of-charge of the battery accumulator electric-quantity battery is characterized.
6. a kind of DC distribution netting twine road voltage control method based on energy storage according to claim 1, it is characterised in that
Whether the detection means being provided with the grid entry point for battery electric quantity and electric current, detection battery electric quantity are in acceptability limit, electric
The size of stream and direction.
7. a kind of DC distribution netting twine road voltage control method based on energy storage according to claim 1, it is characterised in that
In step (5), if battery is controlled using constant voltage, AC/DC current transformer adopts power limitation control；
If pressure discharge and recharge measure do not taken by battery, the change of battery current represents the situation of change of system load；
If original state battery current is 0, then when discharge current increases, load becomes big；By AC/DC current transformer and battery
Single-ended communication, it is possible to increase AC/DC current transformer power output so that battery current returns 0；
If battery reaches discharge and recharge upper lower limit value, the power set-point of forcibly changing AC/DC current transformer is needed, so that battery is carried out
Rationally discharge and recharge.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610938286.7A CN106487000B (en) | 2016-10-25 | 2016-10-25 | A kind of DC distribution cable road voltage control method based on energy storage |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610938286.7A CN106487000B (en) | 2016-10-25 | 2016-10-25 | A kind of DC distribution cable road voltage control method based on energy storage |
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| CN106487000A true CN106487000A (en) | 2017-03-08 |
| CN106487000B CN106487000B (en) | 2018-11-23 |
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Cited By (1)
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| CN115241549A (en) * | 2022-07-29 | 2022-10-25 | 南昌逸勤科技有限公司 | Battery discharge control method, device and storage medium |
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