CN108123459A - A kind of microgrid inverter based on virtual synchronous machine is without frequency difference control method - Google Patents
A kind of microgrid inverter based on virtual synchronous machine is without frequency difference control method Download PDFInfo
- Publication number
- CN108123459A CN108123459A CN201611073302.7A CN201611073302A CN108123459A CN 108123459 A CN108123459 A CN 108123459A CN 201611073302 A CN201611073302 A CN 201611073302A CN 108123459 A CN108123459 A CN 108123459A
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- frequency
- voltage
- control
- frequency difference
- synchronous machine
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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
Abstract
The invention discloses a kind of microgrid inverter based on virtual synchronous machine without frequency difference control method, three parts are controlled including the active acrobatic skill FREQUENCY CONTROL of no frequency difference, reactive power/voltage control, inner ring voltage and current.In equation of rotor motion, traditional damping link is replaced with frequency proportions integral feedback, eliminates the frequency shift (FS) under isolated network pattern, while can realize the multi-mode control of microgrid inverter.It is fed back by frequency integrator, eliminates steady frequency deviation；Under different operating modes, switch controller pattern is not required to, is advantageously implemented multi-mode control and the seamless switching of microgrid inverter.
Description
Technical field
The present invention relates to a kind of microgrid inverter control method more particularly to a kind of microgrid inversions based on virtual synchronous machine
Device is without frequency difference control method.
Background technology
Micro-capacitance sensor is the important way of realization of future source of energy system, has important society and economic implications.Distributed energy
Source such as wind-powered electricity generation, photovoltaic etc. have very big advantage due to the features such as its is renewable, cleaning in following micro-grid system.With point
The permeability of cloth regenerative resource is continuously improved, as connection distributed energy and the tie of power distribution network, the function of inverter
It is affirmed fully by deep excavation and its beneficial effect, but also faces new requirement and challenge simultaneously.
Microgrid inverter has grid-connected, 2 kinds of operating modes of isolated network.When being incorporated into the power networks, microgrid inverter provides work(to main power grid
Rate is transmitted；During isolated power grid, microgrid inverter and other distributions decline source networking in parallel, and voltage and frequency are provided for micro-grid system
Support.In practice, microgrid inverter need work in different modes, complete different control targes and can realize in pattern
Between take over seamlessly.Under normal conditions, controlled using PQ during grid-connected inverters, controlled using VF during isolated network, this method is directly right
Voltage or current instantaneous value are controlled, and have good dynamic property.
It can ensure microgrid inverter under isolated island and grid-connect mode using the droop control method [7-8] based on FREQUENCY CONTROL
Voltage mode control is operated in, therefore is not required to switch controller control model, can realize that inverter is put down between different mode
Sliding cutting changes.Meanwhile droop control, without interconnected communication line, can realize the power between each inverter as a kind of equity control
Distribution, is the good selection in microgrid inversion.But it due to being controlled using active frequency droop, can be led in a wide range of changed power
There are big frequency departures for cause system.
The content of the invention
Causing system during in order to overcome a wide range of changed power, the present invention proposes a kind of there are big frequency departure problem
Microgrid inverter based on virtual synchronous machine is without frequency difference control method.
The technical solution adopted by the present invention to solve the technical problems is：In equation of rotor motion, accumulated with frequency proportions
Feedback agent is divided to eliminate the frequency shift (FS) under isolated network pattern for traditional damping link, while can realize the multi-mode of inverter
Control, is advantageously implemented seamless switching.A kind of microgrid inverter based on virtual synchronous machine is without frequency difference control method, including without frequency
Poor active-acrobatic skill FREQUENCY CONTROL, idle-voltage control, inner ring voltage and current control three parts.
The no frequency difference is active-acrobatic skill FREQUENCY CONTROL in pattern switching, be not required to reconfigurable controller.
It is the active power and nothing specified to main electrical grid transmission that the idle-voltage, which controls and purpose is controlled under grid-connected operating mode,
Work(power, under isolated network operating mode, inverter controls purpose to provide electric voltage frequency support to micro-capacitance sensor.
Based on the Double closed-loop of voltage and current under coordinate, Voltage loop uses proportional integration for the inner ring voltage and current control
Control, electric current loop are controlled using ratio.
The beneficial effects of the invention are as follows：Being based on active frequency droop control algolithm for virtual synchronous machine, there are steady frequencies
The problem of deviation, proposes a kind of microgrid inverter based on virtual synchronous machine without frequency difference control method, i.e., in equation of rotor motion
In, traditional damping link is replaced with frequency proportions integral feedback, eliminates the frequency shift (FS) under isolated network pattern, while can be real
The multi-mode control of existing microgrid inverter.It is fed back by frequency integrator, eliminates steady frequency deviation；Under different operating modes, no
Switch controller pattern is needed, is advantageously implemented multi-mode control and the seamless switching of microgrid inverter.
Description of the drawings
Fig. 1 overall control architectures.
Fig. 2 without frequency difference it is active-FREQUENCY CONTROL block diagram.
Fig. 3 is idle-voltage control block diagram.
Fig. 4 voltage and current control block diagrams.
Specific embodiment
As shown in Figure 1, PCC (point of couple connection) voltage, main network voltage；Top level control gives
Active reactive refers to, and output voltage reference value and input using it as voltage and current inner ring is obtained by power outer shroud, through interior
Portion's voltage and current ring obtains inverter control voltage, and control voltage is modulated to obtain switching signal through SVPWM, and control switching tube is opened
It closes.
As shown in Fig. 2, when frequency increment is not 0, due to the cumulative characteristics of integrator, the output of negative-feedback branch increases, and leads
The input quantity of controller is caused to reduce, inverter output frequency reduces；Under final stable state, inverter output frequency is equal to given frequency
Rate.Therefore, the control method proposed can realize that output is controlled without frequency difference.
As shown in figure 3, since microgrid inverter has grid-connected, 2 kinds of operating modes of isolated network, it is to master that purpose is controlled under grid-connected operating mode
The active power and reactive power that electrical grid transmission is specified；Under isolated network operating mode, inverter controls purpose to provide electricity to micro-capacitance sensor
Voltage-frequency rate supports, and inverter output power is determined by load.
As shown in figure 4, inner ring is used based on the Double closed-loop of voltage and current under coordinate, Voltage loop uses proportional integration control
System, electric current loop are controlled using ratio.
Claims (4)
1. a kind of microgrid inverter based on virtual synchronous machine is without frequency difference control method, it is characterised in that：Including no frequency difference it is active-
Acrobatic skill FREQUENCY CONTROL, reactive power/voltage control, inner ring voltage and current control three parts.
2. the microgrid inverter as described in claim 1 based on virtual synchronous machine is without frequency difference control method, it is characterised in that institute
State no frequency difference it is active-acrobatic skill FREQUENCY CONTROL in pattern switching, be not required to reconfigurable controller.
3. the microgrid inverter as described in claim 1 based on virtual synchronous machine is without frequency difference control method, it is characterised in that institute
It states idle-voltage and controls the active power and reactive power that purpose is controlled under grid-connected operating mode to be specified to main electrical grid transmission,
Under isolated network operating mode, inverter controls purpose to provide electric voltage frequency support to micro-capacitance sensor.
4. the microgrid inverter as described in claim 1 based on virtual synchronous machine is without frequency difference control method, it is characterised in that institute
The control of inner ring voltage and current is stated based on the Double closed-loop of voltage and current under coordinate, Voltage loop uses proportional plus integral control, electric current
Ring is controlled using ratio.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611073302.7A CN108123459A (en) | 2016-11-29 | 2016-11-29 | A kind of microgrid inverter based on virtual synchronous machine is without frequency difference control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611073302.7A CN108123459A (en) | 2016-11-29 | 2016-11-29 | A kind of microgrid inverter based on virtual synchronous machine is without frequency difference control method |
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| Publication Number | Publication Date |
|---|---|
| CN108123459A true CN108123459A (en) | 2018-06-05 |
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| CN201611073302.7A Pending CN108123459A (en) | 2016-11-29 | 2016-11-29 | A kind of microgrid inverter based on virtual synchronous machine is without frequency difference control method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108923460A (en) * | 2018-07-10 | 2018-11-30 | 华北电力大学（保定） | The method for parameter configuration that microgrid virtual synchronous machine multi-machine parallel connection dynamic unanimously responds |
| CN109630354A (en) * | 2018-12-06 | 2019-04-16 | 国网山东省电力公司潍坊供电公司 | Blower and synchronous machine collaboration frequency modulation method and system based on converter control under inertia control |
| CN111342487A (en) * | 2020-02-28 | 2020-06-26 | 国充充电科技江苏股份有限公司 | Parallel control method and system of energy storage converter and electronic equipment |
-
2016
- 2016-11-29 CN CN201611073302.7A patent/CN108123459A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108923460A (en) * | 2018-07-10 | 2018-11-30 | 华北电力大学（保定） | The method for parameter configuration that microgrid virtual synchronous machine multi-machine parallel connection dynamic unanimously responds |
| CN108923460B (en) * | 2018-07-10 | 2023-08-04 | 华北电力大学（保定） | Parameter configuration method for multi-machine parallel dynamic consistent response of micro-grid virtual synchronous machine |
| CN109630354A (en) * | 2018-12-06 | 2019-04-16 | 国网山东省电力公司潍坊供电公司 | Blower and synchronous machine collaboration frequency modulation method and system based on converter control under inertia control |
| CN111342487A (en) * | 2020-02-28 | 2020-06-26 | 国充充电科技江苏股份有限公司 | Parallel control method and system of energy storage converter and electronic equipment |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20180605 |
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| WD01 | Invention patent application deemed withdrawn after publication |