CN106410846A - Low voltage crossing method for micro power grid inverter - Google Patents
Low voltage crossing method for micro power grid inverter Download PDFInfo
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- CN106410846A CN106410846A CN201610909410.7A CN201610909410A CN106410846A CN 106410846 A CN106410846 A CN 106410846A CN 201610909410 A CN201610909410 A CN 201610909410A CN 106410846 A CN106410846 A CN 106410846A
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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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention discloses a low voltage crossing method for micro power grid inverter. The method comprises the following steps: obtaining the power grid voltage at the commonly connecting point; switching the storage inverter from the droop control to the PQ control when the power grid voltage is less than a first preset multiple rated voltage and greater than a second preset multiple rated voltage; calculating the dropping time required by the power grid voltage to drop below the first preset multiple rated voltage; using the storage inverter to output reactive power to the commonly connecting point when the dropping time is within a preset time threshold and the power grid voltage is within a preset voltage threshold; and switching the storage inverter from PQ control to the droop control when the power grid voltage is greater than the first preset multiple rated voltage. The low voltage crossing method for micro power grid inverter achieves the smooth switching mode of the control mode under the condition of low voltage crossing, and improves the safety performance of a micro power grid system.
Description
Technical field
The present invention relates to micro-grid connection control technology field, more particularly to a kind of low-voltage of microgrid inverter is worn
More method.
Background technology
Micro-capacitance sensor is by the group such as distributed power source, energy storage device, energy conversion device, associated loadings and monitoring, protection device
Conjunction forms, and is that electric system is transported in the autonomy with self-contr ol, self-protection and operating capability.Micro-capacitance sensor both can grid-connected be transported
Row is it is also possible to off-grid operation.Expanding it is necessary to consider the running status pair of micro-capacitance sensor during bulk power grid fault with micro-capacitance sensor scale
The impact of bulk power grid stability, this requires that micro-capacitance sensor must possess the ability of certain tolerance line voltage and frequency anomaly,
And there is the ability that can be to keep grid stability offer support.
At present, the correlational study of micro-capacitance sensor low voltage crossing also rests on using crowbar circuit, i.e. overvoltage protection electricity
Road, or line voltage is stablized by grid-connected, the off-grid operation pattern controlling micro-capacitance sensor.Because the micro- source of schedulable is in networking fortune
Can be controlled using PQ under row mode, it would however also be possible to employ droop control, typically adopt droop control under off-grid operation pattern.Cause
This micro-capacitance sensor in off-network and is incorporated into the power networks under pattern, and energy storage inverter is all using droop control, it is to avoid control under two kinds of operational modes
The switching of algorithm processed, reduces the complexity of control system.But energy storage inverter can be considered voltage source, work as grid voltage sags
When, electric current increases, and affects micro-grid system safety.
Content of the invention
Based on this it is necessary to for the technical problem how improving micro-grid system security performance, provide a kind of micro-capacitance sensor
The low-voltage ride-through method of inverter.
A kind of low-voltage ride-through method of microgrid inverter, including：Obtain the line voltage at points of common connection；Work as institute
State line voltage be less than the first preset multiple rated voltage and more than the second preset multiple rated voltage when, by energy storage inverter by
Droop control is switched to PQ control；Calculate described line voltage to start to drop to less than institute during the first preset multiple rated voltage
State the drop-out time of line voltage；When described drop-out time, in the range of preset time threshold and described line voltage is in default electricity
Pressure threshold range in when, by energy storage inverter at points of common connection output reactive power；After output reactive power, work as institute
When stating line voltage more than the first preset multiple rated voltage, energy storage inverter is controlled by PQ and is switched to droop control.
Wherein in an embodiment, described energy storage inverter is switched to PQ control by droop control, including：Obtain simultaneously
First output voltage of energy storage inverter and the first output current when Running State uses droop control；Described first is exported
Voltage and described first output current send into the first depositor；When receiving the first switching command, this moment is sent into described
First output voltage of the first depositor storage and the initial value that controls as PQ of the first output current；Controlled according to described PQ
Initial value, execution PQ controls.
Wherein in an embodiment, described first switching command is the droop control being issued by micro-capacitance sensor central controller
Pattern switching is to PQ control model order.
Wherein in an embodiment, described controlled energy storage inverter by PQ is switched to droop control, including：Obtain
Second output voltage of energy storage inverter and the second output current when PQ controls；By described second output voltage and described second defeated
Go out electric current and send into the second depositor；According to described second output voltage and described second output current, by droop control algorithm meter
Calculate and obtain the output of inverter and sagging coefficient；The output of described inverter and described sagging coefficient are sent into second
Depositor；When receiving the second switching command, will be fed into the output of described inverter and described sagging coefficient as under
Hang down the initial value controlling；According to the initial value of described droop control, execute droop control.
Wherein in an embodiment, described second switching command is to control mould by the PQ that micro-capacitance sensor central controller issues
Formula is switched to droop control mode command.
Wherein in an embodiment, described when described drop-out time, in the range of preset time threshold and described electrical network is electric
When being pressed in the range of predetermined voltage threshold, by energy storage inverter at points of common connection output reactive power, including：Judge institute
State whether drop-out time is less than the first preset time threshold；If so, then judge whether described line voltage is pre- less than described second
If multiple rated voltage；If it is not, then judging whether described line voltage is less than described first preset multiple rated voltage；If so,
Then energy storage inverter adopts PQ control model, output reactive power.
Wherein in an embodiment, described first preset time threshold is 1 second.
Wherein in an embodiment, described when described drop-out time, in the range of preset time threshold and described electrical network is electric
When being pressed in the range of predetermined voltage threshold, by energy storage inverter at points of common connection output reactive power, including：Judge institute
State whether drop-out time is more than the first preset time threshold and whether described drop-out time is less than the second preset time threshold；If institute
State drop-out time more than the first preset time threshold and described drop-out time is less than the second preset time threshold, then judge described electricity
Whether net voltage is meeting grid-connected voltage；If so, then judge whether described line voltage is specified less than described first preset multiple
Voltage；If so, then energy storage inverter adopts PQ control model, output reactive power.
Wherein in an embodiment, described first preset time threshold is 1 second, and the second preset time threshold is 3 seconds.
Wherein in an embodiment, the first preset multiple is 0.9 times, and the second preset multiple is 0.2 times.
The low-voltage ride-through method of above-mentioned microgrid inverter, by obtaining the line voltage at points of common connection, in real time
Change in voltage at detection bulk power grid points of common connection, when bulk power grid Voltage Drop and when meeting grid-connected conditions, energy storage inverter
Keep grid-connected and provide certain reactive power to bulk power grid, with respect to currently existing scheme, this programme makes micro-capacitance sensor have necessarily
The abnormal ability of tolerance line voltage it is possible to provide certain reactive power provide for grid stability support it is achieved that
Control model smooth-switching method in the case of low voltage crossing, improves micro-grid system security performance.
Brief description
Fig. 1 is the applied environment schematic diagram of the low-voltage ride-through method of microgrid inverter in an embodiment；
Fig. 2 is droop control structural representation used in the low-voltage ride-through method of microgrid inverter in an embodiment
Figure；
Fig. 3 is PQ control structure schematic diagram used in the low-voltage ride-through method of microgrid inverter in an embodiment；
Fig. 4 is the step schematic diagram of the low-voltage ride-through method of microgrid inverter in an embodiment；
Fig. 5 is the schematic flow sheet of the low-voltage ride-through method of microgrid inverter in an embodiment；
Fig. 6 is that in the low-voltage ride-through method of microgrid inverter in an embodiment, droop control switching PQ control flow shows
It is intended to；
Fig. 7 is that in the low-voltage ride-through method of microgrid inverter in an embodiment, PQ controls switching droop control flow process to show
It is intended to.
Specific embodiment
Understandable for enabling the above objects, features and advantages of the present invention to become apparent from, below in conjunction with the accompanying drawings to the present invention
Specific embodiment be described in detail.Elaborate a lot of details in order to fully understand this in the following description
Bright.But the present invention can be much to implement different from alternate manner described here, and those skilled in the art can be not
Similar improvement is done, therefore the present invention is not limited by following public specific embodiment in the case of running counter to intension of the present invention.
Refer to Fig. 1, it is the applied environment schematic diagram of the low-voltage ride-through method of microgrid inverter in an embodiment,
This applied environment mainly includes distributed power source, energy storage device, energy conversion device, associated loadings and monitoring, protection device, micro-
The devices such as electrical network central controller.It is right that MGCC (Microgrid control center, micro-capacitance sensor central controller) can achieve
The functions such as the data acquisition of micro-grid system, monitoring, coordination control, load management.Distributed power source mainly includes photovoltaic, wind-powered electricity generation
Regenerative resource.Energy storage device mainly has energy storage battery etc..Associated loadings mainly include scalable and meet and non-adjustable negative
Lotus.Monitoring, protection device mainly include line impedance and intelligent breaker.The basic function of micro-capacitance sensor mainly comprises：System number
According to acquisition function, the coordinated control function of microgrid, succinctly convenient human-computer interaction interface etc..
The input of energy storage inverter is connected to energy-storage units, and outfan is connected to PCC (Point by intelligent breaker
Of Common Coupling, points of common connection) point.Intelligent gateway chopper can measure voltage x current and frequency on bus
Rate, these parameters are sent in MGCC, are controlled and energy management with the frequency modulation frequency modulation carrying out system.When bulk power grid Voltage Drop and
When meeting holding grid-connected conditions, energy storage inverter keeps grid-connected and provides certain reactive power to bulk power grid, supports bulk power grid
Recover；If being unsatisfactory for keeping grid-connected conditions, energy storage inverter cuts out from bulk power grid, and micro-capacitance sensor switchs to off-grid operation.
As shown in Figures 2 and 3, it is respectively droop control knot used in the low-voltage ride-through method of microgrid inverter
Structure schematic diagram and PQ control structure schematic diagram.PQ controls the size of the active-power P referring to inverter output and reactive power Q
Controlled, all can be exported according to setting value, that is, control active-power P and the reactive power Q of inverter output.Sagging (Droop)
Control and refer to realize once adjusting similar control characteristic with the frequency of conventional electric power system by controlling inverter.Pin at present
The droop control method that inverter is mainly adopted is similar to the regulation of traditional synchronous generator, using active frequency (P-f)
Regulative mode with idle-voltage (Q V).When system frequency f declines, the active-power P of inverter output increases；System
When frequency f rises, the diligent power P of inverter output reduces.The active-power P that therefore inverter exports is with system frequency f
Change and automatically adjust, to reach the effect maintaining system frequency dynamic stability.
In the present embodiment, droop control adopts the control mode of active frequency-reactive voltage, and the design of sagging link needs
Different requirements energy storage inverter being controlled in view of micro-capacitance sensor difference operational mode, in the case of micro-capacitance sensor off-grid operation,
Ask energy storage inverter that the load in system can be divided equally in proportion, jointly support voltage and the frequency of micro-capacitance alternating current bus
Rate, it is desirable to the indifference that inverter is capable of active reactive power controls under micro-grid connection operational mode.
Refer to Fig. 4, it is the step schematic diagram of the low-voltage ride-through method of microgrid inverter in an embodiment, for entering
One step understands the low-voltage ride-through method of the microgrid inverter of the present embodiment, and in conjunction with Fig. 5, it is that in an embodiment, micro-capacitance sensor is inverse
Become the schematic flow sheet of the low-voltage ride-through method of device.For example, a kind of low-voltage ride-through method 40 of microgrid inverter includes：
Step S401：Obtain the line voltage at points of common connection.
Specifically, the input of energy storage inverter is connected to energy-storage units, and outfan is connected to public affairs by intelligent breaker
Altogether at junction point, obtain the line voltage at points of common connection.Intelligent gateway chopper can measure the voltage x current on bus
And frequency, these parameters are sent in MGCC, are controlled and energy management with the frequency modulation frequency modulation carrying out system.When bulk power grid voltage falls
When falling and meet holding grid-connected conditions, energy storage inverter keeps grid-connected and provides certain reactive power to bulk power grid, supports big
Power system restoration；If being unsatisfactory for keeping grid-connected conditions, energy storage inverter cuts out from bulk power grid, and micro-capacitance sensor switchs to off-grid operation.
Step S402：When described line voltage is less than the first preset multiple rated voltage and specified more than the second preset multiple
During voltage, energy storage inverter is switched to PQ control by droop control.
Specifically, for example, the first preset multiple is 0.8～1.0 times, and the second preset multiple is 0.0.15～0.25 times.Example
As the first preset multiple is 0.9 times, and the second preset multiple is 0.2 times.Line voltage at intelligent gateway chopper detection PCC, when
When line voltage is less than 0.9 times of rated voltage and is more than 0.2 times of rated voltage, start energy storage inverter low voltage crossing and control calculation
Method switches, and is switched to PQ control by droop control.If line voltage is less than 0.2 times of rated voltage, micro-capacitance sensor is cut from electrical network
Go out, during micro-capacitance sensor off-grid operation, adopt droop control strategy.MGCC is according to the situation of energy storage, load and generating in micro-capacitance sensor, right
Distributed power source Generation Control, energy-storage units control of discharge, spatial load forecasting, realize micro-capacitance sensor optimization and run.
For realizing taking over seamlessly of control model, using two depositors in micro-grid system, storage PQ controls respectively
The information gathering when pattern and droop control pattern, in conjunction with Fig. 4 and Fig. 6, in an embodiment, described by energy storage inverter by sagging
Control and be switched to PQ control, including：
Step 1)：Obtain grid-connected state defeated using the first output voltage of energy storage inverter during droop control and first
Go out electric current.
Step 2)：Described first output voltage and described first output current are sent into the first depositor.
Specifically, when being incorporated into the power networks using droop control, the energy storage inverter output voltage of system acquisition, current value are sent into
First depositor.MGCC issues control mode switch and instructs the initial value that the value of moment storage controls as PQ.
Step 3)：When receiving the first switching command, defeated by the first of described for this moment feeding the first depositor storage
Go out the initial value that voltage and the first output current control as PQ.
For example, described first switching command is that the droop control pattern switching being issued by micro-capacitance sensor central controller is controlled to PQ
Mode command processed.
Specifically, the line voltage situation being detected according to intelligent gateway chopper, MGCC needs to meet low through judgement
Voltage ride-through requires, and issues droop control pattern switching to PQ control model order.
Step 4)：The initial value being controlled according to described PQ, execution PQ controls.
Specifically, the grid voltage sags situation being detected according to intelligent gateway chopper, MGCC issues P, Q of PQ control
Reference value, to realize low voltage crossing, and provides reactive power support to electrical network.
Step S403：Calculate described line voltage to start to drop to less than described electricity during the first preset multiple rated voltage
The drop-out time of net voltage.
Specifically, line voltage at intelligent gateway chopper detection PCC, the line voltage at PCC is by originally stable
State becomes unstable and line voltage and is less than during 0.9 times of rated voltage it is believed that line voltage starts to fall, now from electrical network electricity
Pressing off the beginning starts timing, thus being calculated falling of described line voltage when dropping to less than the first preset multiple rated voltage
Time.
Step S404：When described drop-out time, in the range of preset time threshold and described line voltage is in predeterminated voltage threshold
When in the range of value, by energy storage inverter at points of common connection output reactive power.
Specifically, in an embodiment, described when described drop-out time, in the range of preset time threshold and described electrical network is electric
When being pressed in the range of predetermined voltage threshold, by energy storage inverter at points of common connection output reactive power, including：Judge institute
State whether drop-out time is less than the first preset time threshold；If so, then judge whether described line voltage is pre- less than described second
If multiple rated voltage；If it is not, then judging whether described line voltage is less than described first preset multiple rated voltage；If so,
Then energy storage inverter adopts PQ control model, output reactive power.For example, described first preset time threshold is 1 second.
For example, line voltage starts to fall in 1 second, and line voltage at intelligent gateway chopper detection PCC, if line voltage
Less than 0.9 times of rated voltage and more than 0.2 times of rated voltage, energy storage inverter adopts PQ control model, output reactive power；If
Line voltage is higher than 0.9 times of rated voltage and stablizes, and energy storage inverter controls switchback droop control from PQ, and low voltage crossing is tied
Bundle；Line voltage is less than 0.2 times of rated voltage, then micro-capacitance sensor cuts out from electrical network, and energy storage inverter controls switchback sagging from PQ
Control.
In one embodiment, described when described drop-out time, in the range of preset time threshold and described line voltage is default
When in the range of voltage threshold, by energy storage inverter at points of common connection output reactive power, including：When falling described in judgement
Between whether more than the first preset time threshold and whether described drop-out time is less than the second preset time threshold；If described when falling
Between be less than the second preset time threshold more than the first preset time threshold and described drop-out time, then judge that described line voltage is
No meeting grid-connected voltage；If so, then judge whether described line voltage is less than described first preset multiple rated voltage；If
It is that then energy storage inverter adopts PQ control model, output reactive power.For example, described first preset time threshold is 1 second, the
Two preset time threshold are 3 seconds.
For example, line voltage starts to fall in 1～3 second, line voltage at intelligent gateway chopper detection PCC, electrical network electricity
Pressure does not recover to more than 0.9 times of rated voltage, and MGCC judges whether line voltage is maintaining more than grid-connected contour line, if in dimension
Hold more than grid-connected contour line, then energy storage inverter adopts PQ control model, output reactive power, otherwise micro-capacitance sensor is cut from electrical network
Go out, energy storage inverter controls switchback droop control from PQ.If line voltage is higher than 0.9 times of rated voltage and stable, energy storage inversion
Device controls switchback droop control from PQ, and low voltage crossing terminates.
For example, line voltage starts to fall lasting 3 seconds, line voltage at intelligent gateway chopper detection PCC, line voltage
Still do not recover to more than 0.9 times of rated voltage, judge now electric network fault cannot quick-recovery soon, micro-capacitance sensor cuts from electrical network
Go out, energy storage inverter controls switchback droop control from PQ.If line voltage returns to more than 0.9 times of rated voltage, energy storage inversion
Device controls switchback droop control from PQ, and low voltage crossing terminates.
Step S405：After output reactive power, when described line voltage is more than the first preset multiple rated voltage, will
Energy storage inverter is switched to droop control by PQ control.
Specifically, when line voltage falls suddenly, within 1 second time, voltage is not less than the 20% of rated voltage, and 3
Return to the 90% of rated voltage in second, energy storage inverter should keep grid-connected, and provide certain reactive power support to electrical network；If electrical network
Below grid-connected voltage contour line, energy storage inverter can cut out drop-off voltage from electrical network.Below described grid-connected voltage contour line
Refer to meet grid-connected voltage, voltage when that is, micro-capacitance sensor and bulk power grid are grid-connected.
For realizing taking over seamlessly of control model, using two depositors in micro-grid system, storage PQ controls respectively
Energy storage inverter, in conjunction with Fig. 4 and Fig. 7, in an embodiment, described is controlled by the information gathering when pattern and droop control pattern by PQ
System is switched to droop control, including：
Step a)：Obtain the second output voltage of energy storage inverter and the second output current when PQ controls.
Step b)：Described second output voltage and described second output current are sent into the second depositor.
Step c)：According to described second output voltage and described second output current, it is calculated by droop control algorithm
The output of inverter and sagging coefficient.
Specifically, during low voltage crossing, the energy storage inverter output voltage of system acquisition, current value are sent into second and are posted
Storage, by can be calculated the corresponding ω of inverter output power0、E0And the sagging Coefficient m of active reactive, n are also fed into second and post
Storage.MGCC issues the initial value as droop control for the value that control mode switch instructs moment storage.
Step d)：The output of described inverter and described sagging coefficient are sent into the second depositor.
Step e)：When receiving the second switching command, will be fed into the output of described inverter and described sagging system
Number is as the initial value of droop control.
For example, described second switching command is the PQ control mode switch being issued by micro-capacitance sensor central controller to sagging control
Mode command processed.
Step f)：According to the initial value of described droop control, execute droop control.
Specifically, according to grid operating conditions, MGCC issues P, Q reference value of droop control.
The advantage of technical scheme is：
Achieve micro-capacitance sensor low voltage crossing and the energy storage inverter control method of reactive power support is provided, energy storage inverter
Input is connected to energy-storage units, and outfan is connected to bulk power grid points of common connection by switch.Energy storage inverter real-time detection
Bulk power grid points of common connection change in voltage：When bulk power grid Voltage Drop and when meeting grid-connected conditions, energy storage inverter keeps grid-connected
And provide certain reactive power to bulk power grid；If being unsatisfactory for grid-connected conditions, energy storage inverter cuts out from bulk power grid, micro-capacitance sensor
Switch to off-grid operation.By above-mentioned micro-capacitance sensor energy storage inverter control method, under all adopting under grid-connected and off-grid operation pattern
Hang down and control.For realizing low voltage crossing and to electrical network offer reactive power support, proposing a kind of droop control and take over seamlessly with PQ control
Method.With respect to currently existing scheme, this programme make micro-capacitance sensor have the abnormal ability of certain tolerance line voltage it is possible to
There is provided certain reactive power to provide for grid stability to support；Unite with energy storage inverter under off-grid operation pattern for grid-connected
One micro-grid system adopting droop control, provides the control model smooth-switching method in the case of a kind of low voltage crossing.
Each technical characteristic of embodiment described above can arbitrarily be combined, for making description succinct, not to above-mentioned reality
The all possible combination of each technical characteristic applied in example is all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, all it is considered to be the scope of this specification record.
Embodiment described above only have expressed the several embodiments of the present invention, and its description is more concrete and detailed, but simultaneously
Can not therefore be construed as limiting the scope of the patent.It should be pointed out that coming for those of ordinary skill in the art
Say, without departing from the inventive concept of the premise, some deformation can also be made and improve, these broadly fall into the protection of the present invention
Scope.Therefore, the protection domain of patent of the present invention should be defined by claims.
Claims (10)
1. a kind of low-voltage ride-through method of microgrid inverter, including：
Obtain the line voltage at points of common connection；
When described line voltage is less than the first preset multiple rated voltage and is more than the second preset multiple rated voltage, by energy storage
Inverter is switched to PQ control by droop control；
Calculate described line voltage and start to drop to falling less than described line voltage during the first preset multiple rated voltage
Time；
When described drop-out time in the range of preset time threshold and described line voltage in the range of predetermined voltage threshold when, lead to
Cross energy storage inverter output reactive power at points of common connection；
After output reactive power, when described line voltage be more than the first preset multiple rated voltage when, by energy storage inverter by
PQ control is switched to droop control.
2. the low-voltage ride-through method of microgrid inverter according to claim 1 is it is characterised in that described inverse by energy storage
Become device and PQ control is switched to by droop control, including：
Obtain the first output voltage of energy storage inverter and the first output current when grid-connected state uses droop control；
Described first output voltage and described first output current are sent into the first depositor；
When receiving the first switching command, this moment is sent into first output voltage and first of described first depositor storage
The initial value that output current controls as PQ；
The initial value being controlled according to described PQ, execution PQ controls.
3. the low-voltage ride-through method of microgrid inverter according to claim 1 is it is characterised in that described first switches
Instruction is the droop control pattern switching being issued by micro-capacitance sensor central controller to PQ control model order.
4. microgrid inverter according to claim 1 low-voltage ride-through method it is characterised in that
Described controlled energy storage inverter by PQ is switched to droop control, including：
Obtain the second output voltage of energy storage inverter and the second output current when PQ controls；
Described second output voltage and described second output current are sent into the second depositor；
According to described second output voltage and described second output current, it is calculated the output of inverter by droop control algorithm
Power and sagging coefficient；
The output of described inverter and described sagging coefficient are sent into the second depositor；
When receiving the second switching command, will be fed into the output of described inverter and described sagging coefficient as sagging control
The initial value of system；
According to the initial value of described droop control, execute droop control.
5. the low-voltage ride-through method of microgrid inverter according to claim 5 is it is characterised in that described second switches
Instruction is the PQ control mode switch being issued by micro-capacitance sensor central controller to droop control mode command.
6. the low-voltage ride-through method of microgrid inverter according to claim 1 is it is characterised in that described ought described fall
Fall the time in the range of preset time threshold and described line voltage in the range of predetermined voltage threshold when, by energy storage inverter
The output reactive power at points of common connection, including：
Judge whether described drop-out time is less than the first preset time threshold；
If so, then judge whether described line voltage is less than described second preset multiple rated voltage；
If it is not, then judging whether described line voltage is less than described first preset multiple rated voltage；
If so, then energy storage inverter adopts PQ control model, output reactive power.
7. the low-voltage ride-through method of microgrid inverter according to claim 6 is it is characterised in that described first is default
Time threshold is 1 second.
8. the low-voltage ride-through method of microgrid inverter according to claim 1 is it is characterised in that described ought described fall
Fall the time in the range of preset time threshold and described line voltage in the range of predetermined voltage threshold when, by energy storage inverter
The output reactive power at points of common connection, including：
Judge described drop-out time whether more than the first preset time threshold and when whether described drop-out time is default less than second
Between threshold value；
If described drop-out time is more than the first preset time threshold and described drop-out time is less than the second preset time threshold, sentence
Whether the described line voltage that breaks is meeting grid-connected voltage；
If so, then judge whether described line voltage is less than described first preset multiple rated voltage；
If so, then energy storage inverter adopts PQ control model, output reactive power.
9. the low-voltage ride-through method of microgrid inverter according to claim 8 is it is characterised in that described first is default
Time threshold is 1 second, and the second preset time threshold is 3 seconds.
10. microgrid inverter according to any one of claim 1 to 9 low-voltage ride-through method it is characterised in that
First preset multiple is 0.9 times, and the second preset multiple is 0.2 times.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610909410.7A CN106410846B (en) | 2016-10-18 | 2016-10-18 | The low-voltage ride-through method of microgrid inverter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201610909410.7A CN106410846B (en) | 2016-10-18 | 2016-10-18 | The low-voltage ride-through method of microgrid inverter |
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| Publication Number | Publication Date |
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| CN111463825A (en) * | 2020-04-10 | 2020-07-28 | 华中科技大学 | Low-voltage ride through control method and system for photovoltaic-containing direct-current power distribution system |
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