CN106026136B - A kind of method for controlling power balance for access device of powering - Google Patents
A kind of method for controlling power balance for access device of powering Download PDFInfo
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- CN106026136B CN106026136B CN201610340000.5A CN201610340000A CN106026136B CN 106026136 B CN106026136 B CN 106026136B CN 201610340000 A CN201610340000 A CN 201610340000A CN 106026136 B CN106026136 B CN 106026136B
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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
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
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Abstract
The present invention provides a kind of method for controlling power balance for access device of powering, access device power for accessing at least two generator units and energy-storage units and exporting electric energy to load, it further include controller, method for controlling power balance for access device of powering is the following steps are included: (1) detects the output voltage of energy-storage units, if it is less than starting voltage value, it executes step (2), if it is greater than or equal to starting voltage value, executes step (3)；(2) controller controls generator unit and charges to energy-storage units, executes step (1)；(3) controller control generator unit and/or energy-storage units control each generator unit work in optimal power point to load output electric energy.Provided by the present invention for the method for controlling power balance for access device of powering, the variation that can timely respond to external environment controls each generator unit work in optimal power point, realizes the complex optimum of the energy, to improve the stationarity of power supply, improve the reliability of power supply access device.
Description
Technical field
The present invention relates to field of electrical control, and in particular to a kind of power-balance controlling party for access device of powering
Method.
Background technique
Distributed power generation has many advantages, such as energy-saving and environmental protection, small investment, takes up little area, and the construction period is short, reply system peak load compared with
Centrally connected power supply is more economical, effective, therefore distributed power generation can be used as the useful supplement of extensive centrally connected power supply.
From the point of view of the power supply reliability for improving whole system, distributed power generation can be can be used as backup power source；Also
It can be used as a kind of means for solving the power supply problem in remote countryside area, Island.As one of distributed power generation class
Type: off-network type wind-light storage power supply system is particularly suitable for application to the difficult place of the power supply such as remote districts, island.
Blower, photovoltaic power generation are due to having certain unstability and intermittence, especially existing by such environmental effects
In independent blower, photovoltaic generating system.And the appearance of energy storage technology, then fan, Fu Fa electricity these problems bring solution
Scheme.
By the way that it is only can largely to solve blower, photovoltaic by blower, photovoltaic and the integral power supply system of energy storage group
The vertical existing instability problem that generates electricity, and greatly pushed the development of blower, photovoltaic power generation technology.
Wherein, the quality of the performance of off-network type power supply system is determined to the control of battery.Because of the utilization of energy-storage battery
Rate is related with charging current, and charging current peak value is bigger, and the utilization rate of energy-storage battery is lower；Most of energy-storage battery is to filling simultaneously
Electric current is restricted, to guarantee the normal work of battery, so realizing that the continuous input current of energy-storage battery can by control
The utilization rate controlled the service life for extending battery and improve energy-storage battery has great importance.
Currently, wind and solar hybrid generating system can be divided by structure based on DC bus structure and based on ac bus knot
Structure.In middle-size and small-size wind and solar hybrid generating system, since DC bus structure has, control algolithm is simple, system easily extends, can be with
Inverter, advantage at low cost are shared, this structure is used widely.
The wind-light complementary controlling-inverting integrated machine of this paper institute researching and designing uses the structure based on DC bus, off-network scene
Complementary power generation system structure is as shown in Figure 1, chief component is as follows:
(1) generator unit: single or multiple photovoltaic modulies and wind-driven generator form, and complete energy conversion, are battery
And load supplying.
(2) controller: including photovoltaic controller, controller of fan, the main Charge Management for completing battery.
(3) energy-storage units: single-unit or more piece battery are formed in series and parallel, are had wind or are stored electric energy when having light, it is calm and
It is load supplying when without sunshine.
(4) inverter: direct current is converted into 220V sinusoidal ac by one or more inverter parallel composition, to hand over
Current load power supply.
Load includes DC load and AC load.
Off-network type wind-light storage power supply system haves the defects that following several respects: 1) power supply power output can not by the outside such as weather
Control factor is affected, and output power often has very big fluctuation；2) uncertainty that blower, photovoltaic are contributed increases
The difficulty of system call, while being difficult to realize the complex optimum of the energy.
Summary of the invention
In view of problems of the prior art, the object of the present invention is to provide a kind of power for access device of powering
Balance control method can timely respond to the variation of external environment, control each generator unit work in optimal power point, realize
The complex optimum of the energy improves the reliability of power supply access device to improve the stationarity of power supply.
The present invention provides a kind of method for controlling power balance for access device of powering, and power supply access device is for accessing
With energy-storage units and to load output power, including controller, the power-balance for access device of powering controls generator unit
Method the following steps are included:
(1) detect energy-storage units output voltage, if it is less than starting voltage value, execute step (2), if it is greater than or wait
In starting voltage value, execute step (3)；
(2) controller controls generator unit and charges to energy-storage units, executes step (1)；
(3) controller control generator unit and/or energy-storage units control each generator unit work to load output electric energy
In optimal power point.
Further, in step (3) each generator unit work of control in optimal power point the following steps are included:
(31) by distribution coefficient, the sum of the loss power of bearing power and power supply access device is assigned to each power generation
Unit, the target value as corresponding generator unit power optimizing；
(32) if the output voltage of energy-storage units is less than maximum value, increase the target of each generator unit power optimizing
Value；
(33) if the practical maximum power of generator unit is less than the target value of generator unit power optimizing, control power generation is single
At practical maximum power, insufficient power is provided by the energy-storage units for member work；If the practical maximum work of generator unit
Rate is greater than or equal to the target value of generator unit power optimizing, and control generator unit work is at the target value of power optimizing；
(34) distribution coefficient is adjusted according to the actual power of each generator unit, executed step (32).
Further, the number of distribution coefficient and the number of generator unit are equal.
Further, controller includes the power controller for controlling each generator unit, and power controller includes cutting
Wave circuit, the middle control generator unit work of step (33) is at practical maximum power, or control generator unit work is in power
At the target value of optimizing, comprising the following steps:
(331) power controller accordingly adjusts chopper circuit according to practical maximum power or the target value of power optimizing
The duty ratio of pulse-width signal.
Further, load includes DC load, in step (3) controller control generator unit and/or energy-storage units to
Load output electric energy the following steps are included:
(35) DC bus-bar voltage is set up by generator unit and/or energy-storage units；
(36) to DC load output power.
Further, power supply access device further includes inverter, and load includes AC load, controller control in step (3)
System power supply access device to load output electric energy the following steps are included:
(37) DC bus-bar voltage is set up by generator unit and/or energy-storage units；
(38) DC bus-bar voltage is risen to by target voltage values by the copped wave of energy-storage units；
(39) inverter is opened, to AC load output power.
Further, controller further includes the chopper circuit for controlling energy-storage units, and controller control power generation is single in step (2)
Member to energy-storage units charge the following steps are included:
(21) DC bus-bar voltage is established by generator unit；
(22) controller control energy-storage units are charged with maximum charging current.
Further, energy-storage units are battery.
Further, energy-storage units include single-unit battery or energy-storage units include the more piece storage of series connection and/or parallel connection
Battery.
Further, generator unit is photovoltaic module and/or blower.
Compared with prior art, provided by the present invention for power access device method for controlling power balance, have with
Down the utility model has the advantages that the variation of external environment can be timely responded to, each generator unit work is controlled in optimal power point, realizes energy
The complex optimum in source improves the reliability of power supply access device to improve the stationarity of power supply.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of off-network type wind and solar hybrid generating system；
Fig. 2 is the structural schematic diagram of power supply access device in one embodiment of the present of invention；
Fig. 3 is energy flow schematic diagram in power supply access device；
Fig. 4 is the flow chart of the method for controlling power balance for access device of powering of one embodiment of the present of invention.
Specific embodiment
As shown in Fig. 2, the power supply access device in one embodiment of the present of invention, for accessing at least two generator units
With energy-storage units and to load output power, power supply access device accesses two generator units in the present embodiment: photovoltaic module with
Blower.
Access device of powering includes controller, and controller includes device for power switching, energy flow in access device of powering
Schematic diagram as shown in figure 3, for power access device method for controlling power balance the following steps are included:
(1) detect energy-storage units output voltage, if it is less than starting voltage value, execute step (2), if it is greater than or wait
In starting voltage value, execute step (3)；
(2) controller controls generator unit and charges to energy-storage units, executes step (1)；
(3) controller control generator unit and/or energy-storage units control each generator unit work to load output electric energy
In optimal power point.
In step (3) each generator unit work of control in optimal power point the following steps are included:
(31) by distribution coefficient, the sum of the loss power of bearing power and power supply access device is assigned to each power generation
Unit, the target value as corresponding generator unit power optimizing；
(32) if the output voltage of energy-storage units is less than maximum value, increase the target of each generator unit power optimizing
Value；
(33) if the practical maximum power of generator unit is less than the target value of generator unit power optimizing, control power generation is single
At practical maximum power, insufficient power is provided by the energy-storage units for member work；If the practical maximum work of generator unit
Rate is greater than or equal to the target value of generator unit power optimizing, and control generator unit work is at the target value of power optimizing；
(34) distribution coefficient is adjusted according to the actual power of each generator unit, executed step (32).
In the present embodiment, if the output voltage of energy-storage units is less than maximum value, increase each generator unit power optimizing
Target value generator unit work is controlled according to the target value of the practical maximum power of generator unit and the optimizing of generator unit power
Make to realize the complex optimum of the energy in optimal power point, to improve the stationarity of power supply, improves the reliable of power supply access device
Property.
The number of distribution coefficient and the number of generator unit are equal.
Generator unit is photovoltaic module and/or blower.
Controller includes the power controller for controlling each generator unit, and power controller includes chopper circuit, step
Suddenly control generator unit works at practical maximum power in (33), or the work of control generator unit is in the target of power optimizing
At value, comprising the following steps:
(331) power controller accordingly adjusts chopper circuit according to practical maximum power or the target value of power optimizing
The duty ratio of pulse-width signal.
Load includes DC load, and controller controls generator unit and/or energy-storage units to load output electricity in step (3)
Can the following steps are included:
(35) DC bus-bar voltage is set up by generator unit and/or energy-storage units；
(36) to DC load output power.
Access device of powering further includes inverter, and load includes AC load, and controller control is for being electrically accessed in step (3)
Device to load output electric energy the following steps are included:
(37) DC bus-bar voltage is set up by generator unit and/or energy-storage units；
(38) DC bus-bar voltage is risen to by target voltage values by the copped wave of energy-storage units；
(39) inverter is opened, to AC load output power.
Controller further includes the chopper circuit for controlling energy-storage units, and controller controls generator unit to energy storage in step (2)
Unit charging the following steps are included:
(21) DC bus-bar voltage is established by generator unit；
(22) controller control energy-storage units are charged with maximum charging current.
Specifically, in the present embodiment, generator unit is two: one photovoltaic modulies and a blower, blower and photovoltaic
Rated power is 1.5kW, blower nominal open circuit voltage 110Vdc, photovoltaic nominal open circuit voltage 216Vdc.
Energy-storage units are eight section colloid lead-acid batteries, voltage rating 98V.
Energy-storage units may include single-unit battery, also may include the more piece battery of series connection and/or parallel connection, the present invention
It is without limitation.
After booting, system detects the output voltage of battery first, if the output voltage of battery be greater than 88V, system into
Enter normal mode of operation.If the output voltage for detecting battery is lower than 88V, system enters charge mode, passes through blower, photovoltaic
Component charges the battery.
In normal mode of operation, DC bus-bar voltage is risen to target value (400V) by BOOST circuit, opens inverter
Relay, start inverter.
Blower, photovoltaic module carry out power distribution according to following principle: according to bearing power and power supply access device itself
Loss power determined by total target power value, power distribution is carried out according to distribution coefficient to blower, photovoltaic module, and divide
The determination of distribution coefficient also needs to consider blower and the practical maximum power of photovoltaic module.
Blower, photovoltaic module are respectively connected to power supply access device, the reference with the power of distribution, as power optimizing
Value obtains the target value of power optimizing by power optimizing algorithm.
Blower, photovoltaic module are divided into following three kinds of situations when obtaining the target value of power optimizing:
If (a) output voltage of battery is not up to maximum value, maximum value shows that battery does not need to be further continued for charging, wind
Machine, photovoltaic module will continue to find bigger power points, in addition to being supplied to load and function needed for the loss of access device of powering
Outside rate, extra power is all used as the power of battery charging；
If (b) port voltage of battery has been maximum value, the power of blower, photovoltaic module is calculated according to distribution coefficient
Value, as blower, the target value of photovoltaic module power optimizing；
If (c) due to the influence of the factors such as weather, temperature, the maximum power issued is not enough to for blower, photovoltaic module
It is supplied to the loss of load and access device of powering, at this moment blower, photovoltaic module work are at maximum power point, the power of vacancy
It then needs to provide by battery.
The flow chart of the method for controlling power balance for access device of powering of the present embodiment is as shown in Figure 4:
Does is (1) output voltage of energy-storage units less than starting voltage value? if so, executing step (10)；
(2) DC bus-bar voltage is set up by generator unit and/or energy-storage units；
(3) DC bus-bar voltage is risen into target voltage values；
(4) inverter is opened；
(5) power distribution is carried out, distribution coefficient initial value is set；
Does is (6) output voltage of energy-storage units less than maximum value? if so, executing step (7)；If it is not, executing step
(8)；
(7) increase the target value of each generator unit power optimizing；
Does is (8) the practical maximum power of generator unit less than the target value of generator unit power optimizing? if so, control power generation
At practical maximum power, insufficient power is provided cell operation by energy-storage units；If it is not, control generator unit work exists
At the target value of power optimizing；
(9) distribution coefficient is adjusted according to the actual power of each generator unit, executed step (6)；
(10) DC bus-bar voltage is set up by generator unit；
(11) control energy-storage units are charged with maximum charging current, are executed step (1).
More than two generator units, such as a photovoltaic module and two Fans can certainly be accessed, it equally can be with
Using method for controlling power balance of the invention, each generator unit work is controlled in optimal power point, realizes the synthesis of the energy
Optimization.
The preferred embodiment of the present invention has been described in detail above.It should be appreciated that those skilled in the art without
It needs creative work according to the present invention can conceive and makes many modifications and variations.Therefore, all technologies in the art
Personnel are available by logical analysis, reasoning, or a limited experiment on the basis of existing technology under this invention's idea
Technical solution, all should be within the scope of protection determined by the claims.
Claims (9)
1. a kind of method for controlling power balance for access device of powering, which is characterized in that the power supply access device is used for
At least two generator units are accessed with energy-storage units and to load output power, the power supply access device includes controller, institute
State the method for controlling power balance for access device of powering the following steps are included:
(1) output voltage for detecting the energy-storage units executes step (2) if it is less than starting voltage value, if it is greater than or wait
In starting voltage value, execute step (3)；
(2) controller controls the generator unit and charges to the energy-storage units, executes step (1)；
(3) controller controls the generator unit and/or the energy-storage units to the load supplying, controls each power generation
Cell operation is in optimal power point；The controller control the generator unit work in optimal power point the following steps are included:
(31) by distribution coefficient, it is single that the sum of the loss power of bearing power and power supply access device is assigned to each power generation
Member, the target value as corresponding generator unit power optimizing；
(32) if the output voltage of energy-storage units is less than maximum value, increase the target value of each generator unit power optimizing；
(33) if the practical maximum power of generator unit is less than the target value of the generator unit power optimizing, the hair is controlled
Electric unit works at the practical maximum power, and insufficient power is provided by the energy-storage units；If the reality of generator unit
Border maximum power is greater than or equal to the target value of the generator unit power optimizing, controls the generator unit work in the function
At the target value of rate optimizing；
(34) distribution coefficient is adjusted according to the actual power of each generator unit, executed step (32).
2. the method for controlling power balance as described in claim 1 for access device of powering, which is characterized in that the distribution
The number of coefficient is equal with the number of the generator unit, and the summation of the distribution coefficient is less than or equal to 1.
3. the method for controlling power balance as described in claim 1 for access device of powering, which is characterized in that the control
Device includes the power controller for controlling each generator unit, and the power controller includes chopper circuit, in step (33)
The generator unit work is controlled at the practical maximum power, or the control generator unit work is sought in the power
At excellent target value, comprising the following steps:
(331) power controller is cut according to the practical maximum power or the target value of the power optimizing, corresponding adjust
The duty ratio of the pulse-width signal of wave circuit.
4. the method for controlling power balance as described in claim 1 for access device of powering, which is characterized in that the load
Including DC load, controller described in step (3) controls the generator unit and/or the energy-storage units are supplied to the load
Electricity the following steps are included:
(35) DC bus-bar voltage is set up by the generator unit and/or the energy-storage units；
(36) Xiang Suoshu DC load output power.
5. the method for controlling power balance as described in claim 1 for access device of powering, which is characterized in that the power supply
Access device further includes inverter, and the load includes AC load, and controller described in step (3) controls the generator unit
And/or the energy-storage units to the load supplying the following steps are included:
(37) DC bus-bar voltage is set up by the generator unit and/or the energy-storage units；
(38) DC bus-bar voltage is risen to by target voltage values by the copped wave of the energy-storage units；
(39) inverter, Xiang Suoshu AC load output power are opened.
6. the method for controlling power balance as described in claim 1 for access device of powering, which is characterized in that the control
Device further includes the chopper circuit for controlling the energy-storage units, and controller described in step (2) controls the generator unit to described
Energy-storage units charging the following steps are included:
(21) DC bus-bar voltage is established by the generator unit；
(22) controller is controlled the energy-storage units and is charged with maximum charging current.
7. the method for controlling power balance as described in claim 1 for access device of powering, which is characterized in that the energy storage
Unit is battery.
8. the method for controlling power balance as described in claim 1 for access device of powering, which is characterized in that the energy storage
Unit includes single-unit battery or the energy-storage units include the more piece battery of series connection and/or parallel connection.
9. the method for controlling power balance as described in claim 1 for access device of powering, which is characterized in that the power generation
Unit is photovoltaic module and/or blower.
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| CN106640523B (en) * | 2016-10-20 | 2018-10-16 | 湖南大学 | A kind of accumulator cell charging and discharging control strategy of vertical axis wind power generation system |
| CN109904924B (en) * | 2017-12-07 | 2023-02-28 | 郑州大学 | Distributed optimal bus voltage control method for direct-current micro-grid |
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| CN101087069A (en) * | 2002-05-22 | 2007-12-12 | 迈为电子技术（上海）有限公司 | An intelligent distributed power supply system with plural distributed power unit |
| CN102214934A (en) * | 2011-06-03 | 2011-10-12 | 中国电力科学研究院 | Smooth wind-optical generated output control method based on megawatt-grade battery energy-storage power station |
| CN103986224A (en) * | 2014-03-14 | 2014-08-13 | 北京工业大学 | Wind, solar and electricity complementary type portable power source |
| CN104821607A (en) * | 2015-05-15 | 2015-08-05 | 东北大学 | Photovoltaic microgrid power equalization control method based on three-end cooperative control |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6006717B2 (en) * | 2010-04-26 | 2016-10-12 | スパルク システムズ インコーポレイテッド | Power converter for power generator |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101087069A (en) * | 2002-05-22 | 2007-12-12 | 迈为电子技术（上海）有限公司 | An intelligent distributed power supply system with plural distributed power unit |
| CN102214934A (en) * | 2011-06-03 | 2011-10-12 | 中国电力科学研究院 | Smooth wind-optical generated output control method based on megawatt-grade battery energy-storage power station |
| CN103986224A (en) * | 2014-03-14 | 2014-08-13 | 北京工业大学 | Wind, solar and electricity complementary type portable power source |
| CN104821607A (en) * | 2015-05-15 | 2015-08-05 | 东北大学 | Photovoltaic microgrid power equalization control method based on three-end cooperative control |
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