CN102780229B - Wind turbine power control system applying super capacitor - Google Patents

Wind turbine power control system applying super capacitor Download PDF

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Publication number
CN102780229B
CN102780229B CN201210123808.XA CN201210123808A CN102780229B CN 102780229 B CN102780229 B CN 102780229B CN 201210123808 A CN201210123808 A CN 201210123808A CN 102780229 B CN102780229 B CN 102780229B
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super capacitor
control
power
circuit
wind turbine
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CN102780229A (en
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李广伟
曹书强
于炜东
曹阳
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CNR WIND POWER Co Ltd
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CNR WIND POWER Co Ltd
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Abstract

The invention discloses a wind turbine power control system applying a super capacitor. The wind turbine power control system comprises a wind turbine and a wind turbine control device. A rotor side converter (RSC) and a grid side converter (GSC) in the wind turbine control device are electrically connected and at the same time are connected with an arranged super capacitor system, and the super capacitor system is electrically connected with a control system of the arranged super capacitor system. The wind turbine power control system has the beneficial effects that after being tested by a small experimental prototype, the system has strong power retention feature and can adjust the size of the output power of the wind turbine according to power network dispatching requirements at any time and reduce the influence on the output of the wind turbine from the fluctuation of the wind speed. The wind turbine power control system is high in integration degree, big in power density, small in unit size and light in weight and has strong low-voltage ride through (LVRT) ability. Therefore, with the large-scale development of wind turbines nowadays, the wind turbine power control system has great application significance.

Description

The power of fan control system of application super capacitor
Technical field
The present invention relates to a kind of power control system, especially a kind of power of fan control system applying super capacitor.
Background technology
Current, the control of wind turbine generator normally controls by maximum output, but wind is change at random at any time, thus cause wind turbine generator institute electrogenesis can fluctuation.Current installed capacity of wind-driven power only accounts for 1% ~ 2% of net capacity, and the economical operation of fluctuation on Dispatch of electric net and electric power and electrical network of Wind turbines electric energy does not also form impact.
But along with the fast development of wind-powered electricity generation in world wide, the explosive growth of wind-powered electricity generation enterprise, installed capacity of wind-driven power constantly rises, and wind power generation proportion in mains supply improves constantly.Scholarly forecast was at ensuing 30 years, and wind power-generating grid-connected capacity will reach more than 20% of net capacity.If installed capacity of wind-driven power reaches scale like this, so wind-powered electricity generation fluctuation will can not be ignored the impact of grid stability.The grid-connected problem of Wind turbines also will become the key issue affecting Wind Power Development.
Number of patent application 201010229299.x provides a kind of device for realizing low voltage ride-through capability of wind turbine generator system, the low voltage ride through control system that this technical scheme utilizes wind field additional, super capacitor is chosen needing the energy consumed, realize the low voltage crossing of wind field, meet wind field and pass through characteristic when low voltage failure appears in electrical network, in the program super capacitor mainly between pin wind field age at failure low voltage crossing adopt, although short-sighted power stability when can ensure fault, the power adjustments of normal operation period cannot be completed according to dispatching of power netwoks instruction.Simultaneously lowly wear control system because it needs to arrange specially in wind field, cause practicing system many, to problems such as site requirements are larger.
Number of patent application 200910187343.2, a kind of double-fed aerogenerator excitation system based on ultracapacitor and accumulator hybrid energy-storing is provided, this system is by controlling the rotor-exciting of double feedback electric engine, thus reach the characteristic controlling the power that double feedback electric engine stator side exports, the weak point of the program is that excitation con-trol algorithm itself is very complicated, realize difficulty large, with high costs, and cut out characteristic in short-term due to rotor-side converter during fan trouble, the effective control to unit cannot be completed.
The thinking of the head it off applied at present is short-term wind power prediction technology, this technology is the fluctuation solving wind energy, adaptation dispatching of power netwoks, frequency adjustment, economical operation demand play a role, but even if use the wind power prediction system optimized, predicated error also cannot be avoided.
Summary of the invention
The object of the invention is for overcoming above-mentioned the deficiencies in the prior art, a kind of power of fan control system applying super capacitor is provided.Technical scheme, mainly for solving because the instability of wind energy causes the problem that cannot meet dispatching of power netwoks, frequency adjustment requires, is intended to overcome above-mentioned traditional wind group and is limited to instability of exerting oneself, cannot the difficult problem of large-scale grid connection.This system has that integrated level is high, maintenance is little, power density is large, and the application of super capacitor simultaneously well can also solve the requirement of low voltage crossing, meets the advantage of the needs of electricity market.
For achieving the above object, the present invention adopts following technical proposals:
A kind of power of fan control system applying super capacitor, it comprises blower fan and fan controller, pusher side current transformer RSC in described fan controller is also connected with the super capacitor system be provided with while being electrically connected with net side converter GSC, described super capacitor system is also electrically connected with the control system of the super capacitor system be provided with, and super capacitor system performs charge and discharge order according to central processor CPU order request;
The capacitance C affecting discharge and recharge effect calculates with following formula and chooses:
In formula: k---according to line inductance correction factor; 0.5≤k≤1; Described line inductance is the inductance total value of all circuits be connected with super capacitor;
P n---unit rated power; The charging-discharging cycle of T---super capacitor; V sC---the voltage of super capacitor.
The super capacitor comprising switching power devices in described super capacitor system and be attached thereto.
The control triggering electric circuit of switching power devices that the control system of described super capacitor system comprises central processor CPU and is provided with in the control super capacitor system that is connected with central processor CPU.
Described switching power devices is metal-oxide-semiconductor or IGBT, and it comprises the upper pipe VT1 and lower pipe VT2 series bridge circuit that are electrically connected with super capacitor, and described series bridge circuit is electrically connected between pusher side current transformer RSC and net side converter GSC.
Described control triggering electric circuit comprises the gate drive circuit be electrically connected with lower pipe VT2 with the upper pipe VT1 of switching power devices in super capacitor system; Gate drive circuit is connected with central processor CPU by comparator, central processor CPU is connected with having between pusher side current transformer RSC and net side converter GSC, central processor CPU also has with electric power network scheduling signals end and is connected, and by comparator to switching power devices duty cycle adjustment, meet dispatching of power netwoks requirement.
Described super capacitor is by step-up/step-down circuit, and namely DC/DC circuit is connected on the bus bar of rotor current transformer, and this circuit, according to the active power of rotor current transformer net side and pusher side, determines a certain operating state working in boosting or step-down; Super capacitor is by realizing controlling for the control triggering electric circuit controlling switching power devices in super capacitor system by what be connected with central processor CPU, described super capacitor system central processor CPU, in conjunction with the electric power network scheduling signals that grid dispatching center sends, together by-pass cock power device duty ratio; Super capacitor system central processor CPU and grid dispatching center, both sides run according to Canopen agreement, meet dispatching of power netwoks requirement;
Super capacitor system requires to perform charge and discharge order according to cpu command; The capacitance C affecting discharge and recharge effect calculates with following formula and chooses:
In formula: k---according to line inductance correction factor; 0.5≤k≤1; Described line inductance is the inductance total value of all circuits be connected with super capacitor;
P n---unit rated power; The charging-discharging cycle of T---super capacitor; V sC---the voltage of super capacitor.
Described step-up/step-down circuit comprise be connected to rotor current transformer DC master row by reactance and VT1 and VT2 two IGBT semiconductor device, the switch conditions of control VT1 and VT2 just can control the working condition of super capacitor;
Step-up/step-down circuit is according to pusher side active-power P rwith net side active-power P gthe switch conditions of relation control VT1 and VT2, namely control the size of duty ratio; Work as P r> P gtime, super capacitor system works in decompression mode, and now super capacitor absorbs energy, the voltage V of super capacitor sCraise; Work as P r< P gtime, super capacitor system works in boosting die pressing type, and now super capacitor releases energy, the voltage V of super capacitor sCreduce; Ensure that wind turbine generator sends power invariability, meet dispatching of power netwoks requirement.
Operation principle of the present invention:
Central processor CPU is used for according to wind regime and dispatching of power netwoks instruction Intelligent adjustment air-blower control strategy to meet grid requirements; What gate-drive was used for performing semiconductor device VT1, VT2 according to cpu command opens shutoff; Super capacitor system is used for requiring charge and discharge energy according to CPU.Patent of the present invention relates to a kind of super capacitor group by step-up/step-down circuit, and namely DC/DC circuit is connected on the bus bar of rotor current transformer, and described rotor current transformer comprises pusher side current transformer RSC and net side converter GSC.This circuit, according to the active power regulation situation of rotor current transformer net side and pusher side, determines a certain state working in boosting or step-down.
The utilization of super capacitor and can free adjustment switching power devices duty ratio by the control triggering electric circuit of switching power devices in central processor CPU and the control super capacitor system that is connected with central processor CPU, meets the system of dispatching of power netwoks requirement; This technical scheme realizes when wind energy transformation electric energy is more, is temporarily stored by energy by super capacitor, when fluctuating appears in wind-force, when wind energy cannot meet dispatching of power netwoks demand, to be gained merit energy, meet dispatching of power netwoks requirement by super capacitor supply.。
Beneficial effect of the present invention is:
This level of integrated system is high, and power density is large, and unit volume is little, lightweight, and has stronger low voltage ride-through capability, in today of blower fan extensive development, has very strong application value.
The present invention directly adopts the control of rotor-side converter and net side converter poower flow balance, solves this problem, have more engineering feasibility with comparatively succinct algorithm and lower input.
Accompanying drawing explanation
Fig. 1 is that the power that the present invention is based on super capacitor Wind turbines controls electrical principle schematic block diagram.
1. blades, 2. gear box in figure, 3. double-fed type induction generator, the 4. grid-connected switch of stator, 5. step-up transformer, 6. electrical network, 7. reactor, 8. super capacitor system, 9. gate drive circuit, 10. electric power network scheduling signals end.
Embodiment
Below in conjunction with drawings and Examples, the present invention is further described.
In Fig. 1, embodiment is a kind of power of fan control system applying super capacitor, on the blower fan be provided with and fan controller basis, wherein set up the control system of super capacitor system 8 and super capacitor system thereof.
In this system, comprise blower fan and fan controller, blower fan comprises blade 1, blade 1 is connected with gear box 2 by axle, gear box 2 is connected with (DFIG) double-fed type induction generator 3, (DFIG) double-fed type induction generator is connected with step-up transformer 5 by the grid-connected switch 4 of stator, step-up transformer 5 is connected with electrical network 6, between (DFIG) double-fed type induction generator 3 and step-up transformer 5, electric path is provided with super capacitor system 8, the electric path arranged is in series with reactor 7 with super capacitor system 8, also be connected with the super capacitor system 8 be provided with while being electrically connected with the pusher side current transformer RSC in described fan controller and net side converter GSC, described super capacitor system 8 is also electrically connected with the control system of the super capacitor system be provided with.The super capacitor comprising switching power devices in super capacitor system 8 and be attached thereto, the control triggering electric circuit of switching power devices that the control system of super capacitor system comprises central processor CPU and is provided with in the control super capacitor system that is connected with central processor CPU.
Switching power devices is metal-oxide-semiconductor or IGBT in systems in which, and it comprises the upper pipe VT1 and lower pipe VT2 series bridge circuit that are electrically connected with super capacitor, and described series bridge circuit is electrically connected between pusher side current transformer RSC and net side converter GSC.
Control triggering electric circuit comprises the gate drive circuit 9 be electrically connected with lower pipe VT2 with the upper pipe VT1 of switching power devices in super capacitor system; Gate drive circuit 9 is connected with central processor CPU by comparator, central processor CPU is connected with having between pusher side current transformer RSC and net side converter GSC, central processor CPU also has with electric power network scheduling signals end 10 and is connected, and by comparator to switching power devices duty cycle adjustment, meet dispatching of power netwoks requirement.
Super capacitor group is by step-up/step-down circuit, and namely DC/DC circuit is connected on the bus bar of rotor current transformer, and this circuit, according to the active power of rotor current transformer net side and pusher side, determines a certain operating state working in boosting or step-down;
Super capacitor is by realizing controlling for the control triggering electric circuit controlling switching power devices in super capacitor system by what be connected with central processor CPU, described super capacitor system central processor CPU, in conjunction with the electric power network scheduling signals that grid dispatching center sends, together by-pass cock power device duty ratio; Super capacitor system central processor CPU and grid dispatching center, both sides run according to Canopen agreement, meet dispatching of power netwoks requirement;
Super capacitor system requires to perform charge and discharge order according to cpu command; The capacitance C affecting discharge and recharge effect calculates with following formula and chooses:
In formula: k---according to line inductance correction factor; 0.5≤k≤1; Described line inductance is the inductance total value of all circuits be connected with super capacitor;
P n---unit rated power; The charging-discharging cycle of T---super capacitor; V sC---the voltage of super capacitor.
Step-up/step-down circuit comprise be connected to rotor current transformer DC master row by reactance and VT1 and VT2 two IGBT semiconductor device, the switch conditions of control VT1 and VT2 just can control the working condition of super capacitor;
Step-up/step-down circuit is according to pusher side active-power P rwith net side active-power P gthe switch conditions of relation control VT1 and VT2, namely control the size of duty ratio.Work as P r> P gtime, super capacitor system 8 works in decompression mode, and now super capacitor absorbs energy, the voltage V of super capacitor sCraise.Work as P r< P gtime, super capacitor system 8 works in boost mode, and now super capacitor releases energy, the voltage V of super capacitor sCreduce.Ensure that wind turbine generator sends power invariability, meet dispatching of power netwoks requirement.
This system is through the test of small-scale test model machine, and in 30KW model machine, under 1200rpm, the situation according to the random torque of simulation is tested, the first behavior torque value, unit Nm, the second behavior performance number Kw, and test result is as follows:
As can be seen from test data, the program has stronger power retention performance, keeps unit output power value to fluctuate in more among a small circle when torque random fluctuation.Reach good implementation result
By reference to the accompanying drawings the specific embodiment of the present invention is described although above-mentioned; but not limiting the scope of the invention; one of ordinary skill in the art should be understood that; on the basis of technical scheme of the present invention, those skilled in the art do not need to pay various amendment or distortion that creative work can make still within protection scope of the present invention.

Claims (1)

1. apply the power of fan control system of super capacitor, comprise blower fan and fan controller, pusher side current transformer RSC in described fan controller is also connected with the super capacitor system be provided with while being electrically connected with net side converter GSC, and described super capacitor system is also electrically connected with the control system of the super capacitor system be provided with;
The super capacitor comprising step-up/step-down circuit in described super capacitor system and be attached thereto;
Described step-up/step-down circuit is connected to the DC master row of rotor current transformer, and step-up/step-down circuit comprises reactance and switching power devices VT1 and switching power devices VT2;
The control system of described super capacitor system comprises central processor CPU and the control triggering electric circuit of the switching power devices VT1 that is provided with in the control super capacitor system that is connected with central processor CPU and switching power devices VT2;
Described control triggering electric circuit comprises the gate drive circuit be electrically connected with switching power devices VT1 in super capacitor system and switching power devices VT2; Gate drive circuit is connected with central processor CPU by comparator, central processor CPU is all connected with pusher side current transformer RSC and net side converter GSC, central processor CPU also has with electric power network scheduling signals end and is connected, and by comparator to switching power devices VT1 and switching power devices VT2 duty cycle adjustment, meet dispatching of power netwoks requirement;
It is characterized in that, described super capacitor is by step-up/step-down circuit, and namely DC/DC circuit is connected on the DC master row of rotor current transformer, and this circuit, according to the active power of rotor current transformer net side and pusher side, determines a certain operating state working in boosting or step-down; Super capacitor is by realizing controlling for the control triggering electric circuit controlling switching power devices VT1 and switching power devices VT2 in super capacitor system by what be connected with central processor CPU, the electric power network scheduling signals that the central processor CPU of the control system of described super capacitor system sends in conjunction with grid dispatching center, together by-pass cock power device VT1 and switching power devices VT2 duty ratio; The central processor CPU of the control system of super capacitor system and grid dispatching center, both sides run according to Canopen agreement, meet dispatching of power netwoks requirement;
Super capacitor system performs charge and discharge order according to central processor CPU order request; The capacitance C affecting discharge and recharge effect calculates with following formula and chooses:
C = 1 k 2.1 P n T V SC 2
In formula: k---according to line inductance correction factor; 0.5≤k≤1; Described line inductance is the inductance total value of all circuits be connected with super capacitor;
P n---unit rated power; The charging-discharging cycle of T---super capacitor; V sC---the voltage of super capacitor;
Step-up/step-down circuit is according to pusher side active-power P rwith net side active-power P grelation carry out the switch conditions of control switch power device VT1 and switching power devices VT2, namely control the size of duty ratio; Work as P r> P gtime, super capacitor system works in decompression mode, and now super capacitor absorbs energy, the voltage V of super capacitor sCraise; Work as P r< P gtime, super capacitor system works in boost mode, and now super capacitor releases energy, the voltage V of super capacitor sCreduce; Ensure that wind turbine generator sends power invariability, meet dispatching of power netwoks requirement.
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CN105098786A (en) * 2015-09-18 2015-11-25 许昌学院 System and method for stabilizing voltage fluctuation of wind power micro-grid employing super capacitors
CN105633983A (en) * 2016-03-01 2016-06-01 国网甘肃省电力公司 Control system for improving frequency support capability of wind turbine generator set by super capacitor
CN105634013A (en) * 2016-03-01 2016-06-01 国网甘肃省电力公司 Control method for improving abnormal voltage withstand capability of wind turbine generator set by super capacitor

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