CN106877361A - A kind of wind power regulating system based on super capacitor - Google Patents
A kind of wind power regulating system based on super capacitor Download PDFInfo
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- CN106877361A CN106877361A CN201510914962.2A CN201510914962A CN106877361A CN 106877361 A CN106877361 A CN 106877361A CN 201510914962 A CN201510914962 A CN 201510914962A CN 106877361 A CN106877361 A CN 106877361A
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Abstract
A kind of wind power regulating system based on super capacitor, including the control of system main circuit, network, super capacitor energy management and current transformer control four parts.The present invention stabilizes that wind power plant is active, reactive power fluctuation by the use of ultracapacitor group as energy-storage travelling wave tube, maintains wind power plant output end voltage, influence of the reduction wind power plant to the power network quality of power supply.Wind power adjusting means has good dynamic property, can not only well absorb the ripple components of wind power plant output reactive power, serves the effect for suppressing voltage ripple of power network, has also effectively smoothed the active power fluctuation of input power network.
Description
Technical field
The present invention relates to a kind of wind power regulating system, more particularly to a kind of wind power regulating system based on super capacitor.
Background technology
With the continuous improvement of installed capacity of wind-driven power, the fluctuation of wind power output power is increasingly paid attention to the adverse effect that power network brings.Wind-power electricity generation is the most fast renewable energy power generation technology of current development.But, wind energy is a kind of energy of change at random, and wind speed change can cause the fluctuation of Wind turbines power output, and the quality of power supply on power network produces influence.Therefore, the power output regulation of research integrated wind plant is as the major issue in wind generating technology.
Current active power for wind power fluctuation is more to smooth its power output using the method for directly adjusting wind turbine running status, but the power adjusting of the method is limited in one's ability;Reactive power fluctuation generally carries out Reactive-power control using static passive compensation device in parallel, but reactive power compensator cannot stabilize active power fluctuation.Additional energy storage device can both adjust reactive power, stabilization wind power plant busbar voltage, can be again a current study hotspot in regulated in wider range active power.Wind-power electricity generation research shows to be located at influence maximum of the fluctuating power of 0.01 Hz~1 Hz to the power network quality of power supply, stabilizing frequency range wind-powered electricity generation fluctuation can just be achieved the goal using the energy stores of short period, therefore, it is possible to realize that the energy storage device of relatively low capacity of short-time energy storage has practical value higher to wind-power electricity generation.
Suppressed wind power fluctuation in the past and be considered as the energy storage technologies such as battery, flywheel or superconduction more, super capacitor energy-storage technical concerns were less.Ultracapacitor has the advantages that power density is high, has extended cycle life, environmental nonpollution and non-maintaining, with the development of manufacturing technology, the energy density of ultracapacitor has large increase, and the commercial applications stage has been come into some temporary electricity energy storage occasions.Using ultracapacitor storage energy, the wind-powered electricity generation fluctuation for stabilizing the important frequency range of Power Output for Wind Power Field has a good application prospect.
The content of the invention
In order to overcome, wind power plant is active, reactive power fluctuation is big, it is difficult to maintain the problem of wind power plant output end voltage, the present invention to propose a kind of wind power regulating system based on super capacitor.
The technical solution adopted for the present invention to solve the technical problems is：Wind power regulating system based on super capacitor energy-storage, by the use of ultracapacitor group as energy-storage travelling wave tube, stabilizes that wind power plant is active, reactive power fluctuation, maintains wind power plant output end voltage, reduces influence of the wind power plant to the power network quality of power supply.
Wind power regulating system based on super capacitor energy-storage includes that system main circuit, network control, super capacitor energy management and current transformer control four parts.
The system main circuit is made up of four-quadrant Voltage type converter, two-way DC converter, super capacitor and step-up transformer.
The network control provides the active of device, reactive power instruction according to active power of wind power field and output end busbar voltage fluctuation situation.
The super capacitor energy management is realized by ultracapacitor voltage control ring and voltage limit module.
The current transformer control uses Double-loop Control Strategy, outer voltage control DC bus-bar voltage to keep constant, and current inner loop controls the dynamic change of ultracapacitor charging and discharging currents, avoids ultracapacitor charging and discharging currents from exceeding limitation.
The beneficial effects of the invention are as follows：By the use of ultracapacitor group as energy-storage travelling wave tube, stabilize that wind power plant is active, reactive power fluctuation, maintain wind power plant output end voltage, reduce influence of the wind power plant to the power network quality of power supply.Wind power adjusting means has good dynamic property, can not only well absorb the ripple components of wind power plant output reactive power, serves the effect for suppressing voltage ripple of power network, has also effectively smoothed the active power fluctuation of input power network.
Brief description of the drawings
Fig. 1 system architectures.
Fig. 2 Control system architectures.
Fig. 3 current transformer control strategies.
Specific embodiment
In Fig. 1, points of common connection (PCC) place is connected to local load, ultracapacitor group (SC) as DC side energy-storage travelling wave tube, power regulating system (PCS) is parallel to wind power plant output end bus using four-quadrant Voltage type converter (VSC) cascade two-way DC converter (Bi-DC/DC) structure eventually through step-up transformer.Wind power shaping modes：When the active power fluctuation of setting frequency range is detected, device quickly absorbs active, the reactive power of fluctuation, and smooth wind power power output maintains wind power plant output end busbar voltage stabilization.Charge and discharge mode：On the one hand ultracapacitor group is charged to magnitude of voltage set in advance when restarting after device is initially installed or is overhauled, the electric energy release for ultracapacitor group being stored in plant failure or maintenance；On the other hand when the active power fluctuation in setting frequency range is not detected, ultracapacitor voltage is maintained by the slow discharge and recharge of ultracapacitor.
Net level controls to filter the ripple components of 0.01Hz~1Hz frequency ranges in wind turbine power output,
More than 1Hz compositions are mainly absorbed by the inertia of wind turbine.
Ultracapacitor quickly provide charge-discharge electric power stabilize wind-powered electricity generation fluctuate when, its voltage can rapidly change and may cause the generation of discharge and recharge therewith, overcharge can have a strong impact on ultracapacitor service life, overdischarge can then cause ultracapacitor power output to be limited, therefore ensure super-capacitor voltage within the range of permission by voltage limit module.
In Fig. 3, active, Reactive Power Control can be realized by the uneoupled control of id and i q.Two-way DC converter uses Double-loop Control Strategy, outer voltage control DC bus-bar voltage to keep constant, and current inner loop controls the dynamic change of ultracapacitor charging and discharging currents, it is to avoid ultracapacitor charging and discharging currents exceed limitation.
Wind power regulating system mainly stabilizes the wind power fluctuation of 0.01Hz~1Hz, therefore according to the stored energy capacitance of wind power low-limit frequency fluctuation configuration energy-storage units, it is considered to energy-storage units have identical discharge and recharge space.Ultracapacitor monomer voltage is general relatively low (2 .5 V or so), therefore energy-storage units are made up of to reach power system capacity demand multiple ultracapacitor monomer connection in series-parallel.Energy-storage units design will consider energy and the aspect demand of power 2.
Claims (5)
1. a kind of wind power regulating system based on super capacitor, it is characterised in that：Four parts are controlled including system main circuit, network control, super capacitor energy management and current transformer.
2. the wind power regulating system of super capacitor is based on as claimed in claim 1, it is characterised in that the system main circuit is made up of four-quadrant Voltage type converter, two-way DC converter, super capacitor and step-up transformer.
3. the wind power regulating system of super capacitor is based on as claimed in claim 1, it is characterised in that the network control provides the active of device, reactive power instruction according to active power of wind power field and output end busbar voltage fluctuation situation.
4. the wind power regulating system of super capacitor is based on as claimed in claim 1, it is characterised in that the super capacitor energy management is realized by ultracapacitor voltage control ring and voltage limit module.
5. the wind power regulating system of super capacitor is based on as claimed in claim 1, it is characterised in that the current transformer control uses Double-loop Control Strategy, it is to avoid ultracapacitor charging and discharging currents exceed limitation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510914962.2A CN106877361A (en) | 2015-12-13 | 2015-12-13 | A kind of wind power regulating system based on super capacitor |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510914962.2A CN106877361A (en) | 2015-12-13 | 2015-12-13 | A kind of wind power regulating system based on super capacitor |
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| CN106877361A true CN106877361A (en) | 2017-06-20 |
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| CN201510914962.2A Pending CN106877361A (en) | 2015-12-13 | 2015-12-13 | A kind of wind power regulating system based on super capacitor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111049201A (en) * | 2019-11-22 | 2020-04-21 | 河南理工大学 | Coordination control method for AC/DC power grid hybrid high-power interface converter |
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- 2015-12-13 CN CN201510914962.2A patent/CN106877361A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111049201A (en) * | 2019-11-22 | 2020-04-21 | 河南理工大学 | Coordination control method for AC/DC power grid hybrid high-power interface converter |
| CN111049201B (en) * | 2019-11-22 | 2021-07-16 | 河南理工大学 | Coordination control method for AC/DC power grid hybrid high-power interface converter |
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Application publication date: 20170620 |