CN106877390A - A kind of micro-capacitance sensor takes over seamlessly middle converter control method - Google Patents
A kind of micro-capacitance sensor takes over seamlessly middle converter control method Download PDFInfo
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- CN106877390A CN106877390A CN201510927276.9A CN201510927276A CN106877390A CN 106877390 A CN106877390 A CN 106877390A CN 201510927276 A CN201510927276 A CN 201510927276A CN 106877390 A CN106877390 A CN 106877390A
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Abstract
Middle converter control method is taken over seamlessly the invention discloses a kind of micro-capacitance sensor, including PQ controllers, V/f controllers and seamless switching control three parts.Under grid-connect mode, using PQ controls, trace scheduling is active, reactive power instruction for system for the present invention；During off-network, using V/f controls, the stabilization of system voltage and frequency is maintained；In order to realize it is grid-connected, off-network pattern take over seamlessly, when system grid connection is run, off-network controller real-time tracking PQ controllers output, with reduce it is grid-connected to off-network switch fluctuation；When turning to be incorporated into the power networks by off-network, regulation micro-capacitance sensor voltage amplitude, frequency and phase make its tracking line voltage, so as to reduce grid-connected dash current, realize taking over seamlessly.
Description
Art
Current transformer is taken over seamlessly the present invention relates to a kind of micro-capacitance sensor, more particularly to a kind of micro-capacitance sensor takes over seamlessly middle converter control method.
Background technology
With the sternness increasingly of quick consumption and the environmental pollution of traditional energy, the focus of research both at home and abroad is turned into scattered low capacity distributed generation system, energy-storage system, load and the integrated micro-grid system of protection device.Micro-capacitance sensor has played its technical, economy, flexibility advantage with grid-connected and between two kinds of methods of operation of isolated island conversions.Can be seamlessly transitted in method of operation handoff procedure, be key point that can micro-capacitance sensor ensure system safe and stable operation and load power supply reliability.
Micro-capacitance sensor has two kinds of mode of operations, i.e. grid-connect mode and stand-alone mode.Under normal circumstances, when micro-capacitance sensor works in grid-connect mode, bulk power grid provides voltage and frequency reference to micro-grid system, and micro-capacitance sensor current transformer works in PQ control models, and micro-capacitance sensor is according to dispatch command, power needed for being conveyed to power network；When the grid fails, micro-capacitance sensor is quickly converted to independent operation mode by grid-connect mode, and now micro-grid system is operable with V/f control models or droop control pattern, is used to maintain the stabilization of its voltage and frequency, realizes the stable operation of system；When power system restoration is normal, micro-grid system can be transferred to by independent operation mode and is incorporated into the power networks again, be controlled very flexible.
Taking over seamlessly for micro-capacitance sensor and off-network pattern, refers in handoff procedure, it is ensured that the voltage and frequency of micro-capacitance sensor are maintained in the waving interval of permission.Specify by international microgrid operation standard, should ensure that after micro-capacitance sensor and off-network switching, ac bus voltage, frequency departure meet（Rated voltage）.In order to mitigate caused system oscillation in micro-capacitance sensor operational mode handoff procedure, appropriate control strategy should be selected in each micro battery current transformer aspect, to realize taking over seamlessly for micro-capacitance sensor.
The content of the invention
In order to overcome the problem of microgrid operational mode handoff procedure, the present invention to propose that a kind of micro-capacitance sensor takes over seamlessly middle converter control method.
The technical solution adopted for the present invention to solve the technical problems is：
The present invention is studied the current transformer in light storage micro-grid system, and the PQ controls and V/f controls to current transformer are designed, while also being analyzed taking over seamlessly between two kinds of control models.
A kind of micro-capacitance sensor takes over seamlessly middle converter control method, including PQ controllers, V/f controllers and seamless switching control three parts.
The PQ controllers are used to be incorporated into the power networks in pattern, and current transformer is controlled.
The V/f controllers are under off-grid operation pattern, it is ensured that the stability contorting of system voltage and frequency.
The seamless switching control includes being incorporated into the power networks to off-grid operation switching, off-grid operation to three parts of switching and isolated island detection of being incorporated into the power networks.
The beneficial effects of the invention are as follows：Under grid-connect mode, using PQ controls, trace scheduling is active, reactive power instruction for system for the present invention；During off-network, using V/f controls, the stabilization of system voltage and frequency is maintained；In order to realize it is grid-connected, off-network pattern take over seamlessly, when system grid connection is run, off-network controller real-time tracking PQ controllers output, with reduce it is grid-connected to off-network switch fluctuation；When turning to be incorporated into the power networks by off-network, regulation micro-capacitance sensor voltage amplitude, frequency and phase make its tracking line voltage, so as to reduce grid-connected dash current, realize taking over seamlessly.
Brief description of the drawings
Fig. 1 PQ control block diagrams.
Fig. 2 V/f control block diagrams.
Fig. 3 isolated islands are detected.
Specific embodiment
In Fig. 1, control structure is twin nuclei, and inner ring is current control, and outer shroud is Power Control；Outer Loop Power Controller tracks active, idle command value by controlling current transformer active power of output and reactive power, realizes the grid-connected Power Control of system；Inner ring current controller then by the feedback control to watt current and reactive current, realizes the indifference control of electric current.
In Fig. 2, system uses double circle structure, and inner ring is inductive current control, and outer shroud is capacitance voltage control, and control system is carried out under coordinate system；In order to realize the stability contorting of voltage, d axle reference voltages are typically set at 1pu, and q shaft voltages reference value is 0, three-phase instantaneous threshold voltage ea, eb, the ec process that will be sampled
Obtain ed, eq after * MERGEFORMAT conversion, and contrasted with given reference signal, carry out PI controls by error, realize the stability contorting of voltage.Meanwhile, outer ring controller is exported as the reference signal MERGEFORMAT and MERGEFORMAT of inner ring current controller, by inner ring Current Feedback Control, realizes the indifference control to electric current.The control of frequency is realized by phase lock control.
The output of V/f controllers and the output of PQ controllers are designed as a negative-feedback as the input of V/f controllers, so that the switching preceding V/f controller moment follows the output of PQ controllers, it is consistent both to ensure when grid-connect mode is switched to off-network pattern output state, so that reducing system is converted to vibration when V/f is controlled by PQ controls.After power system restoration is normal, micro-capacitance sensor can be the pattern that is incorporated into the power networks by off-grid operation patten transformation, and system control is converted to PQ control models by V/f control models.After grid-connected instruction is connected to, the amplitude of micro-capacitance sensor quick regulation output voltage, frequency and phase, the difference of amplitude, the amplitude of frequency and phase and power network, frequency and phase when micro-grid connection point voltage is when allowing in tolerance limit, send reclosing command, the now grid-connected dash current very little of system, it is achieved thereby that micro-capacitance sensor by off-grid operation to be incorporated into the power networks when take over seamlessly.
In Fig. 3, system mainly includes bandpass filter, proportional gain module and clipping module, and output is disturbed as System Reactive Power and instructed.Wherein, bandpass filter is mainly used in filtering noise jamming and direct current offset；Disturbance very little when proportional gain module makes grid-connected, can keep the stabilization of system, and can make system unstability in isolated island so as to detect that isolated island occurs；Clipping module is then used to limit disturbance amplitude, and anti-locking system excessively stream or power factor are too low.
Claims (4)
1. a kind of micro-capacitance sensor takes over seamlessly middle converter control method, it is characterised in that：Three parts are controlled including PQ controllers, V/f controllers and seamless switching.
2. micro-capacitance sensor as claimed in claim 1 takes over seamlessly middle converter control method, it is characterised in that the PQ controllers are used to be incorporated into the power networks in pattern, and current transformer is controlled.
3. micro-capacitance sensor as claimed in claim 1 takes over seamlessly middle converter control method, it is characterised in that the V/f controllers are under off-grid operation pattern, it is ensured that the stability contorting of system voltage and frequency.
4. micro-capacitance sensor as claimed in claim 1 takes over seamlessly middle converter control method, it is characterised in that the seamless switching control includes being incorporated into the power networks to off-grid operation switching, off-grid operation to three parts of switching and isolated island detection of being incorporated into the power networks.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510927276.9A CN106877390A (en) | 2015-12-14 | 2015-12-14 | A kind of micro-capacitance sensor takes over seamlessly middle converter control method |
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| CN201510927276.9A CN106877390A (en) | 2015-12-14 | 2015-12-14 | A kind of micro-capacitance sensor takes over seamlessly middle converter control method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108521140A (en) * | 2018-04-03 | 2018-09-11 | 深圳电丰电子有限公司 | A kind of distributed photovoltaic and from energy storage inversion system |
| CN113162087A (en) * | 2021-04-21 | 2021-07-23 | 石家庄通合电子科技股份有限公司 | Energy storage converter grid-connection and grid-disconnection control method and device and energy storage system |
| CN113890102A (en) * | 2021-11-03 | 2022-01-04 | 贵州电网有限责任公司 | Power distribution network important load smooth switching control method based on energy storage quick response |
-
2015
- 2015-12-14 CN CN201510927276.9A patent/CN106877390A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108521140A (en) * | 2018-04-03 | 2018-09-11 | 深圳电丰电子有限公司 | A kind of distributed photovoltaic and from energy storage inversion system |
| CN113162087A (en) * | 2021-04-21 | 2021-07-23 | 石家庄通合电子科技股份有限公司 | Energy storage converter grid-connection and grid-disconnection control method and device and energy storage system |
| CN113162087B (en) * | 2021-04-21 | 2023-01-24 | 石家庄通合电子科技股份有限公司 | Energy storage converter grid-connected and off-grid control method and device and energy storage system |
| CN113890102A (en) * | 2021-11-03 | 2022-01-04 | 贵州电网有限责任公司 | Power distribution network important load smooth switching control method based on energy storage quick response |
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Application publication date: 20170620 |