CN103904683A - Control method and device of inverter power source with mixed output characteristics - Google Patents
Control method and device of inverter power source with mixed output characteristics Download PDFInfo
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- CN103904683A CN103904683A CN201410102713.9A CN201410102713A CN103904683A CN 103904683 A CN103904683 A CN 103904683A CN 201410102713 A CN201410102713 A CN 201410102713A CN 103904683 A CN103904683 A CN 103904683A
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Abstract
The invention relates to a control method and device of an inverter power source with mixed output characteristics. When a micro power grid runs in a grid-connected mode, the inverter power source in the micro power grid can output corresponding power along with the voltage amplitude of a system and the frequency of the system in a Droop control mode. When the micro power grid is switched to be in an island mode, the inverter power source with the mixed output characteristics can be switched to be in a V/f control mode from the Droop control mode when the frequency of the system reaches the reference frequency. The device can run in the grid-connected mode of the micro power grid and can also run in the island mode of the micro power grid, can provide stable voltage amplitude and frequency for the system and has wide application prospects.
Description
Technical field
The present invention relates to a kind of control method with the inverter that mixes output characteristic.
Background technology
In recent years, along with the continuous growth of electricity needs, and day by day the increasing the weight of of energy shortage, environmental pollution, distributed generation technology has obtained development fast under the support energetically of national governments.In order to give full play to the advantage of distributed power generation and to solve large electrical network and the contradiction between it, the generally form operation with micro-electrical network by distributed generation system, but along with the access of micro-electrical network, having occurred the problem that some are new, is mainly which kind of control mode micro-electrical network adopts just to maintain the stable operation of whole system under islet operation pattern.
Micro-electrical network is in the time of lonely net state, and need to carry out effectively controlling to each micro-power supply of its inside can stable operation to maintain whole system, guarantees that the voltage of system and frequency are in rational scope.At present, Chinese scholars has mainly proposed the control mode of three kinds of inverters based on converter interface: Droop control mode (droop control mode), V/f control mode and PQ control mode, first two control mode be mainly used in micro-electrical network under islet operation pattern time for system provides stable voltage and frequency, but while adopting droop control mode, along with voltage magnitude and the frequency of the change system of workload demand also can change accordingly, therefore droop control mode belongs to droop control, in the time that workload demand changes greatly, the voltage magnitude of system and frequency may exceed the permissible variation scope of regulation, can not make system stable operation, although it is constant that the inverter of employing V/f control mode can maintain voltage magnitude and the frequency of system within the scope of its variable capacity, can only run under the island mode of micro-electrical network, can not be incorporated into the power networks, adopt the inverter of PQ control mode can not independent operating, can only run on other power supplys provides in the situation that voltage and frequency support.
Summary of the invention
The object of this invention is to provide a kind of control method with the inverter that mixes output characteristic, control in order to overcome prior art Droop the defect of controlling with V/f, cannot realize to solve existing inverter control mode the problem that all maintains whole system stable operation under grid-connected pattern and island mode.
For achieving the above object, the solution of the present invention comprises:
A control method with the inverter that mixes output characteristic, at least comprises the steps:
Grid-connected control step: in the time being incorporated into the power networks pattern, adopt Droop control mode at micro-electrical network;
Switching controls step: when micro-electrical network switches to islet operation pattern by the pattern of being incorporated into the power networks, continue to adopt Droop control mode until the voltage magnitude of system, the reference value V that frequency drops to its setting
ref, f
ctime, switch to V/f control mode.
Under V/f control mode, in the time that reaching the peak power output of V/f control section, the power of its output automatically switches to Droop control mode.
Inverter adopts the turn-on and turn-off of SPWM control mode power ratio control switching device IGBT.
A control device with the inverter that mixes output characteristic, at least comprises as lower module:
Grid-connected control module: in the time being incorporated into the power networks pattern, adopt Droop control mode at micro-electrical network;
Switching controls module: when micro-electrical network switches to islet operation pattern by the pattern of being incorporated into the power networks, continue to adopt Droop control mode until the voltage magnitude of system, the reference value V that frequency drops to its setting
ref, f
ctime, switch to V/f control mode.
Under V/f control mode, in the time that reaching the peak power output of V/f control section, the power of its output automatically switches to Droop control mode.
Inverter adopts the turn-on and turn-off of SPWM control mode power ratio control switching device IGBT.
The control method of the inverter based on converter interface of the present invention and system are applicable to the system that micro-electric network source is connected with large electrical network by grid-connected converter, in the time that micro-electrical network is incorporated into the power networks, its inner inverter can adopt the electric voltage frequency of Droop control mode system for tracking to export corresponding power; When micro-electrical network switches to island mode, the inverter with mixing output characteristic will be V/f control mode by Droop control mode switching in the time that system frequency reaches the reference frequency of its setting, provide voltage and frequency to support as master control power supply, in the time that the power of its output reaches the peak power output of V/f control section, automatically switch to again Droop control mode, and come burning voltage and frequency by other micro-power supply.This shows, the present invention not only can run under the grid-connected pattern of microgrid, can also run under the island mode of microgrid, for system provides stable voltage magnitude and frequency, is with a wide range of applications.
Accompanying drawing explanation
Fig. 1 is the control system schematic diagram with the inverter that mixes output characteristic based on converter interface;
Fig. 2 is P-f droop characteristic figure of the present invention;
Fig. 3 is Q-V droop characteristic figure of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the present invention will be further described in detail.
Inverter (being micro-power supply in Fig. 1) is connected with large electrical network by grid-connected converter, the reference variable meritorious and reactive power and setting of the feedback variable that converter control module obtains by electric current and voltage detection module, the real-time frequency that phase-locked loop module obtains, inverter output that power computation module obtains is carried out logic judgement, final output SPWM modulation signal, and compare with carrier signal, control the turn-on and turn-off of the device for power switching IGBT of converter in both intersection point moment.
Method of the present invention realizes the control to inverter (micro-power supply) by controlling grid-connected converter, the multi-form electric energy that grid-connected converter is mainly used in inverter to send is converted to the alternating current of power frequency, there is different topological structures for different requirements, therefore can design according to concrete requirement, the present invention is not limited it.
Specifically, electric current and voltage detection module is mainly for detection of the electric current and voltage variable of current system; Phase-locked loop module is mainly for detection of the real-time frequency of system, to control the frequency of grid-connected converter tracking system; The electric current and voltage variable that power computation module is mainly used in obtaining by detection module calculates the meritorious and reactive power in real time of micro-power supply output; Grid-connected converter be mainly used in micro-power supply and large electrical network connection and between electric energy exchange, controlled by converter control module.Converter control module is mainly for generation of the SPWM modulation signal of controlling grid-connected converter, to realize the control to inverter output characteristic.Converter control module comprises Droop controller and V/f controller, makes the output external characteristic of inverter meet P-f and Q-V droop characteristic and V/f characteristic curve simultaneously.
When micro-electrical network in and when net state, voltage and the frequency of the grid-connected converter system for tracking of inverter are exported corresponding active power and reactive power; When micro-operation of power networks is in island mode lower time, the voltage magnitude of the grid-connected converter output of inverter and frequency are respectively voltage magnitude and the frequency reference value of V/f under controlling.
Specifically, contrast Fig. 2, Fig. 3, when micro-electrical network is incorporated into the power networks, owing to there being large electrical network to come voltage and the frequency of systems stabilisation, the electric voltage frequency that inverter adopts Droop control mode to follow large electrical network runs on the relevant position (as the AB section in Fig. 2) on P-f and Q-V characteristic curve, and active power of output and reactive power are respectively P
0, Q
0; In the time that micro-electrical network switches to island mode by grid-connected pattern, because the workload demand originally being met by large electrical network will be provided by inverter, inverter will increase voltage magnitude and the frequency of its power output regulating system according to droop characteristic, as the voltage magnitude of system, the reference value V that frequency drops to its setting
ref, f
ctime inverter will be automatically converted to V/f control mode (as the BC section in Fig. 2), the voltage magnitude and the frequency that maintain its output as master control power supply are constant, regulate simultaneously its power output meet load power demand.Now this inverter provides voltage and frequency to support as master control power supply.
Further, under V/f control mode, in the time that the power of inverter output reaches the peak power output of V/f control section, automatically switch to again Droop control mode, and come burning voltage and frequency by other inverter.
This shows, the inverter with this mixing output characteristic not only can run under the grid-connected pattern of microgrid, can also run under the island mode of microgrid, for system provides stable voltage magnitude and frequency, has a wide range of applications occasion.
What more than provide is the specific embodiment of the present invention, but the present invention is not limited to described execution mode.First Droop control mode when basic ideas of the present invention are grid-connected Droop control mode, isolated island, increase voltage magnitude and the frequency of its power output regulating system according to droop characteristic, as the voltage magnitude of system, the reference value V that frequency drops to its setting
ref, f
ctime inverter will be automatically converted to V/f control mode.For those of ordinary skills, according to instruction of the present invention, model, formula, the parameter of designing various distortion do not need to spend creative work.Variation, modification, replacement and the modification of without departing from the principles and spirit of the present invention execution mode being carried out still fall within the scope of protection of the present invention.
Claims (6)
1. a control method with the inverter that mixes output characteristic, is characterized in that, at least comprises the steps:
Grid-connected control step: in the time being incorporated into the power networks pattern, adopt Droop control mode at micro-electrical network;
Switching controls step: when micro-electrical network switches to islet operation pattern by the pattern of being incorporated into the power networks, continue to adopt Droop control mode until the voltage magnitude of system, the reference value V that frequency drops to its setting
ref, f
ctime, switch to V/f control mode.
2. a kind of control method with the inverter that mixes output characteristic according to claim 1, is characterized in that, under V/f control mode, automatically switches to Droop control mode in the time that the power of its output reaches the peak power output of V/f control section.
3. a kind of control method with the inverter that mixes output characteristic according to claim 1 and 2, is characterized in that, inverter adopts the turn-on and turn-off of SPWM control mode power ratio control switching device IGBT.
4. a control device with the inverter that mixes output characteristic, is characterized in that, at least comprises as lower module:
Grid-connected control module: in the time being incorporated into the power networks pattern, adopt Droop control mode at micro-electrical network;
Switching controls module: when micro-electrical network switches to islet operation pattern by the pattern of being incorporated into the power networks, continue to adopt Droop control mode until the voltage magnitude of system, the reference value V that frequency drops to its setting
ref, f
ctime, switch to V/f control mode.
5. a kind of control device with the inverter that mixes output characteristic according to claim 4, is characterized in that, under V/f control mode, automatically switches to Droop control mode in the time that the power of its output reaches the peak power output of V/f control section.
6. according to a kind of control device with the inverter that mixes output characteristic described in claim 4 or 5, it is characterized in that, inverter adopts the turn-on and turn-off of SPWM control mode power ratio control switching device IGBT.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104201718A (en) * | 2014-09-05 | 2014-12-10 | 广东电网公司佛山供电局 | Droop-inverse droop type microgrip inverter power source with hysteretic characteristics |
| CN104539186A (en) * | 2014-12-12 | 2015-04-22 | 国家电网公司 | V/f and inverse droop micro-grid inverter power supply with hysteretic characteristic |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102723741A (en) * | 2012-04-26 | 2012-10-10 | 南京航空航天大学 | Grid connection presynchronization control method of microgrid inverter based on droop control |
| CN103390892A (en) * | 2013-06-26 | 2013-11-13 | 国家电网公司 | Micro grid power supply control method and system based on converter port |
| CN103414207A (en) * | 2013-07-15 | 2013-11-27 | 中国科学院电工研究所 | Droop control-based smooth switching method |
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2014
- 2014-03-19 CN CN201410102713.9A patent/CN103904683A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102723741A (en) * | 2012-04-26 | 2012-10-10 | 南京航空航天大学 | Grid connection presynchronization control method of microgrid inverter based on droop control |
| CN103390892A (en) * | 2013-06-26 | 2013-11-13 | 国家电网公司 | Micro grid power supply control method and system based on converter port |
| CN103414207A (en) * | 2013-07-15 | 2013-11-27 | 中国科学院电工研究所 | Droop control-based smooth switching method |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104201718A (en) * | 2014-09-05 | 2014-12-10 | 广东电网公司佛山供电局 | Droop-inverse droop type microgrip inverter power source with hysteretic characteristics |
| CN104539186A (en) * | 2014-12-12 | 2015-04-22 | 国家电网公司 | V/f and inverse droop micro-grid inverter power supply with hysteretic characteristic |
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Application publication date: 20140702 |