CN108123460A - A kind of double mode droop control method of inverter - Google Patents
A kind of double mode droop control method of inverter Download PDFInfo
- Publication number
- CN108123460A CN108123460A CN201611074111.2A CN201611074111A CN108123460A CN 108123460 A CN108123460 A CN 108123460A CN 201611074111 A CN201611074111 A CN 201611074111A CN 108123460 A CN108123460 A CN 108123460A
- Authority
- CN
- China
- Prior art keywords
- inverter
- voltage
- control
- double mode
- droop control
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- 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
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
-
- 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 double mode droop control method of inverter, including voltage-type three-phase inverter, double mode droop control, voltage and current double -loop control three parts.The present invention is using double mode droop control, and under the control model, inverter can be in real time switched to according to the situation of change of load or droop control.The control model is easy to implement, directly switches at the voltage of droop control ring output and frequency, and handoff procedure is smooth, can reduce output voltage and frequency and the offset of rated value, improves system power quality.
Description
Technical field
The present invention relates to the double mode droop control methods of a kind of inverter control method more particularly to a kind of inverter.
Background technology
Today's society, with the getting worse of problem of environmental pollution and the increasingly depleted of non-renewable energy resources, based on can
Distributed power generation (distributed generation, DG) unit of the renewable sources of energy receives more and more attention.DG units
Usually combine energy storage device and load etc. and form micro-capacitance sensor, compared with conventional power generation systems, micro-capacitance sensor can realize self-contr ol,
Protection and management, can not only be incorporated into the power networks, but also can islet operation.During micro-capacitance sensor islet operation, without bulk power grid as electric voltage frequency
Support, by inverter decision systems voltage and frequency, at this point, directly influencing the power supply matter of whole system to the control of inverter
Amount.
In electric power system, voltage and frequency are the important indicators of system power supply quality.China's standard GB/T/T15945-
1995 regulations：Power system frequency is controlled in the range of 50 ± 0.2 Hz, and scope range of the fluctuation of voltage is related with system voltage grade
System.In micro-grid system, the terminal voltage and frequency of load are closer to rated value, its runnability is better, therefore, rationally
Control inverter simultaneously reduces the offset of voltage and frequency and rated value and has important practical significance.
Traditional P-f is widely used in P-V droop controls in the control of inverter, they have the characteristics that respective control.
Inverter active power of output is proportional to output frequency in traditional active power/frequency (P-f) droop control, reactive power with
Output voltage is proportional.In corresponding active power/voltage (P-V) droop control reactive power and output frequency into than
Example, active power are proportional to output voltage.
Load is system important component, operating status directly by terminal voltage and frequency influence, meanwhile, load variations
Also the output voltage and frequency of inverter can be influenced.Since inverter is mostly using P-f and P-V droop controls, output power deviates
During rated value, 2 kinds of control methods itself will generate voltage and frequency shift (FS), during changing load, 2 kinds of sagging methods control subinverses
The voltage and frequency for becoming device output also show different variation tendencies.
The content of the invention
In order to overcome the problems, such as that traditional control method generates voltage and frequency shift (FS), the present invention proposes a kind of the double of inverter
Pattern droop control method.
The technical solution adopted by the present invention to solve the technical problems is：
The double mode droop control method of inverter, it is double including voltage-type three-phase inverter, double mode droop control, voltage and current
Ring controls three parts.
The bridge-type that the voltage-type three-phase inverter is made of six insulated gate bipolar IGBT with anti-paralleled diode
Circuit is formed.
Power ring of the double mode droop control as control system, can be such that inverter is switched in real time under Pf or PV
It hangs down and controls.
The amplitude and angle synthesized reference voltage that the voltage and current double -loop control is obtained according to power ring, by Voltage loop
Modulating wave is obtained with electric current loop.
The beneficial effects of the invention are as follows：The present invention is using double mode droop control, and under the control model, inverter can root
It is switched in real time according to the situation of change of load or droop control.The control model is easy to implement, in the electricity of droop control ring output
Directly switch at pressure and frequency, and handoff procedure is smooth, can reduce output voltage and frequency and the offset of rated value, improves
System power quality.
Description of the drawings
Fig. 1 voltage-type three-phase inverters.
The grid-connected schematic diagram of Fig. 2 voltage source inverters.
The whole control block diagram of Fig. 3 inverters.
Fig. 4 double modes realize block diagram.
Specific embodiment
In Fig. 2, inverter is reduced to a voltage source, is connected to by line impedance on power grid E ∠ 0.
To reduce inverter output voltage and frequency and the offset of rated value, load impedance amplitude or impedance angle variation
When, inverter should use droop control method adaptable therewith.Since system loading is continually changing, load impedance amplitude
Or during impedance angle variation, control method is switched to P-f in real time or P-V is sagging, this control model is as proposed by the present invention
Double mode droop control, the control model combine P-V with P-f droop controls in the control advantage of different load, energy
Enough reduce inverter output voltage and frequency and the offset of rated value, improve power supply quality.Load impedance amplitude or impedance angle
During variation, it is difficult to its variation is directly measured, so, double mode droop control measures the output electricity of inverter in specific implementation
Pressure and frequency, and reflect as control variable and then indirectly load variations.The switching of load impedance amplitude and impedance angle is faced
The control targe of dividing value corresponding voltage and frequency.When the voltage or frequency measured in real time is beyond control targe and certain time
Afterwards, switching droop control method can be restored it in control range.
In Fig. 3, using power ring, Voltage loop and electric current loop three close-loop control, wherein, power ring uses double mode droop control
Mode, inverter can be switched to P-f or P-V droop controls in real time.System in selection voltage or frequency in order to control after target,
In real time measurement inverter output voltage and frequency and as control variable, system loading change when, the output of inverter
Voltage and frequency can also change correspondingly, and when variable is controlled to change in the range of control targe, method for handover control is not required, when
It switches droop control method after target zone and certain time.The amplitude and angle that power ring obtains are closed
Into reference voltage, modulating wave is obtained by Voltage loop (pi regulator) and electric current loop (P adjusters) double -loop control.
As shown in figure 4, reference voltage amplitude can directly be cut at the sagging obtained voltage (E1 and E2) of P-f and P-V
It changes, can switch at reference frequency (f1 and f2) or angle, switch using at frequency.This is because angle is the product of frequency
Point, frequency spike can be caused by switching at reference to angle, influence system stability.P-f and P- are achieved that using above method
Taking over seamlessly between V.
Double mode droop control needs to determine whether method for handover control according to the real-time measurement values of voltage and frequency, when
When inverter output voltage and frequency fluctuate near critical switching condition, just it is present with showing for frequent switching droop control method
As the output so as to cause control method selected section is unstable.In order to improve the antijamming capability of system, prevent control method
The malfunction of switching, the critical value part of control method switching is using Hysteresis control, and Hysteresis control has " return difference " characteristic, rationally
Choose the influence that the ring width of stagnant ring can select switch threshold value part control method to avoid interference signal, only when voltage and
Frequency is more than upper threshold or less than lower threshold and after being kept for a period of time, and inverter can just switch droop control method, this
Sample reduces the unnecessary switching of control method, improves system stability.
Claims (4)
1. a kind of double mode droop control method of inverter, it is characterised in that：Including under voltage-type three-phase inverter, double mode
Vertical control, voltage and current double -loop control three parts.
2. the double mode droop control method of inverter as described in claim 1, it is characterised in that three contrary of voltage-type
Become device to be made of six insulated gate bipolar IGBT with anti-paralleled diode bridge circuits formed.
3. the double mode droop control method of inverter as described in claim 1, it is characterised in that the sagging control of double mode
The power ring of control system is made as, inverter can be made to be switched to Pf or PV droop controls in real time.
4. the double mode droop control method of inverter as described in claim 1, it is characterised in that the voltage and current is bicyclic
The amplitude obtained according to power ring and angle synthesized reference voltage are controlled, modulating wave is obtained by Voltage loop and electric current loop.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611074111.2A CN108123460A (en) | 2016-11-29 | 2016-11-29 | A kind of double mode droop control method of inverter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611074111.2A CN108123460A (en) | 2016-11-29 | 2016-11-29 | A kind of double mode droop control method of inverter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108123460A true CN108123460A (en) | 2018-06-05 |
Family
ID=62226650
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611074111.2A Pending CN108123460A (en) | 2016-11-29 | 2016-11-29 | A kind of double mode droop control method of inverter |
Country Status (1)
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| CN (1) | CN108123460A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110120676A (en) * | 2019-06-18 | 2019-08-13 | 国网新疆电力有限公司电力科学研究院 | MMC-HVDC converter station Poewr control method and system based on simulation synchronous motor characteristic |
| CN114640141A (en) * | 2022-05-17 | 2022-06-17 | 浙江大学 | Network-building type fan control method for offshore wind power diode rectification unit sending-out system |
| US11641109B2 (en) | 2022-05-17 | 2023-05-02 | Zhejiang University | Grid-forming wind turbine control method for diode rectifier unit-based offshore wind power transmission system |
-
2016
- 2016-11-29 CN CN201611074111.2A patent/CN108123460A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110120676A (en) * | 2019-06-18 | 2019-08-13 | 国网新疆电力有限公司电力科学研究院 | MMC-HVDC converter station Poewr control method and system based on simulation synchronous motor characteristic |
| CN114640141A (en) * | 2022-05-17 | 2022-06-17 | 浙江大学 | Network-building type fan control method for offshore wind power diode rectification unit sending-out system |
| CN114640141B (en) * | 2022-05-17 | 2022-08-05 | 浙江大学 | Network-building type fan control method for offshore wind power diode rectification unit sending-out system |
| US11641109B2 (en) | 2022-05-17 | 2023-05-02 | Zhejiang University | Grid-forming wind turbine control method for diode rectifier unit-based offshore wind power transmission system |
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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 |