CN205882720U - Wind -powered electricity generation field reactive power compensator based on double -fed wind turbine generator system net side transverter - Google Patents

Wind -powered electricity generation field reactive power compensator based on double -fed wind turbine generator system net side transverter Download PDF

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Publication number
CN205882720U
CN205882720U CN201620819889.0U CN201620819889U CN205882720U CN 205882720 U CN205882720 U CN 205882720U CN 201620819889 U CN201620819889 U CN 201620819889U CN 205882720 U CN205882720 U CN 205882720U
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side inverter
double
net side
wind
fed
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CN201620819889.0U
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郭权利
杨森
徐春明
杨宇昕
赵化峰
翟岭江
王艳春
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/70—Wind energy
    • Y02E10/76—Power conversion electric or electronic aspects
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/10—Flexible AC transmission systems [FACTS]

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Abstract

The utility model provides a based on the wind -powered electricity generation field reactive power compensator of double -fed formula wind turbine generator system net side transverter, the device includes change of current controller, SVG controller, double -fed wind turbine generator system control system and the machine side transverter of dc bus, dc bus change over switch, direct current BUS capacitors, net side transverter, net side transverter, 1. The utility model discloses a to net the side transverter and transform into SVG, and make double -fed wind turbine generator system can abandon to becalm again and to use as SVG according to the operation of conventional mode at the fan under the quick -witted circumstances. Corresponding increase the wind -powered electricity generation field be in the capacity of the dynamic reactive compensation equipment of hot standby state, improved the undulant ability of wind -powered electricity generation field reply grid voltage. 2. The utility model discloses under the not high condition of transformation expense, the utilization ratio of wind turbine generator system net side transverter has been improved, investment that can corresponding reduction construction reactive power compensator.

Description

Reactive Compensation in Wind Farm device based on double-fed fan motor machine networking side inverter
Technical field:
This utility model belongs to technical field of wind power generation, for reactive power compensator, is based on double-fed fan motor machine networking side Inverter or there is the Reactive Compensation in Wind Farm device of analog structure.
Technical background:
Owing to China's electrical network is dissolved the limited in one's ability of wind-powered electricity generation, wind energy turbine set often occurs abandoning wind phenomenon.Wind energy turbine set when abandoning wind, Often use a part of compressor emergency shutdown, the method for operation of a part of unit work.If the wind-powered electricity generation being in stopped status can be set For being used, then can play the effect improving utilization rate of equipment and installations.
The circuit structure of net side inverter, dc bus and the electric capacity of double-fed fan motor unit is (such as dotted line inclusion region in Fig. 1 Shown in) similar to the circuit structure of voltage bridge-type static reacance generator (hereinafter referred to as SVG), therefore can be by dotted portion The control system of circuit and net side inverter improves, and is transformed into SVG and uses.Thus realize double-fed fan motor unit Run in the usual way, can run by SVG mode in the case of blower fan is stopped transport again.The most not only can improve the utilization of wind power equipment Rate, can increase in wind energy turbine set again the capacity of the dynamic passive compensation equipment being in hot stand-by duty, and then improve wind energy turbine set The ability of reply voltage ripple of power network.
Summary of the invention:
Goal of the invention:
The purpose of this utility model is to solve double-fed fan motor unit because abandoning the idleness of equipment problem becalming machine and cause.Make Double-fed fan motor unit is when electromotor is stopped transport, and can be made exclusively for reacance generator is that wind energy turbine set carries out reactive-load compensation, thus improves Wind power equipment utilization rate.Meanwhile, moreover it is possible to play and increase the dynamic passive compensation equipment being in hot stand-by duty in wind energy turbine set Capacity, improve wind energy turbine set reply voltage ripple of power network ability effect.
Technical scheme:
A kind of Reactive Compensation in Wind Farm device based on double-fed wind generator machine networking side inverter, its this device includes direct current Bus, dc bus switching switch, dc-link capacitance, net side inverter, the inverter controller of net side inverter, SVG control Device, double-fed fan motor unit control system and pusher side inverter；Described dc bus one end is connected with pusher side inverter, the other end Being connected with net side inverter, dc-link capacitance is contained in the position between pusher side inverter and net side inverter, dc bus electricity Holding and be connected between two dc bus, dc bus switching switch is contained in pusher side inverter and dc bus electricity on positive and negative bus Between appearance, after the inverter controller of described net side inverter and SVG controller parallel connection, one end is connected with net side inverter, another End is connected with double-fed fan motor unit control system, and double-fed fan motor unit control system is also connected with dc bus switching switch.
Pusher side inverter connects electromotor, electromotor connecting fan impeller, and net side inverter connects box booster transformer, Net side inverter is connected to electromotor also by generator unit stator power output lead.
When blower fan is in stopped status, net side inverter and dc-link capacitance coordinate composition static reacance generator.
Net side inverter is configured with the control that two functions of inverter controller and SVG controller of net side inverter are different Device.
When net side inverter is as static reacance generator, net side inverter is controlled by SVG controller.
Double-fed fan motor unit control system connects wind energy turbine set master control system.
Additionally, two controllers control system with double-fed fan motor unit the most respectively is connected and is controlled.Double-fed fan motor The working method of net side converter Control system is selected by the control system of unit according to operating states of the units: when unit just When often generating electricity, inverter controller Controling network side inverter running, net side inverter works in commutating mode；When unit is owing to abandoning When wind causes shutting down, disconnect dc bus switching switch, SVG controller Controling network side inverter run, net side inverter work Make in SVG pattern.
Advantageous effect:
This utility model advantage and good effect be: 1. this utility model is by being transformed into SVG by net side inverter, makes double Feedback Wind turbines can run in the usual way, can use as SVG again in the case of machine of becalming abandoned by blower fan.Accordingly increase Wind energy turbine set is in the capacity of the dynamic passive compensation equipment of hot stand-by duty, improves wind energy turbine set reply voltage ripple of power network energy Power.2. this utility model is in the case of improvement expenses is the highest, improves the utilization rate of wind turbine networking side inverter, can be corresponding Reduce the investment building reactive power compensator.
Accompanying drawing illustrates:
Fig. 1 is double-fed fan motor unit main electrical scheme of the present utility model and control principle drawing.
In figure: 1 dc bus；2 dc bus switching switches；3 dc-link capacitances；4 net side inverters； 5 inverter controllers；6 SVG controllers；7 double-fed fan motor unit control systems；8 wind energy turbine set master control systems；9 pusher sides Inverter；10 impellers；11 electromotors；12 box booster transformers, 13 generator unit stator power output leads.
Detailed description of the invention:
The utility model is described in further detail below in conjunction with the accompanying drawings, and following example are illustrative, is not to limit Property, it is impossible to limit protection domain of the present utility model with this.
As it is shown in figure 1, a kind of Reactive Compensation in Wind Farm device based on double-fed wind generator machine networking side inverter, this device Including dc bus 1, dc bus switching switch 2, dc-link capacitance 3, net side inverter 4, the change of current control of net side inverter Device 5 processed, SVG controller 6, double-fed fan motor unit control system 7 and pusher side inverter 9；Described dc bus 1 one end and pusher side Inverter 9 is connected, and the other end is connected with net side inverter 4, and dc-link capacitance 3 is contained in pusher side inverter 9 and net side inverter 4 Between position, dc-link capacitance 3 is connected between two dc bus, and dc bus switching switch 2 is contained on positive and negative bus Between pusher side inverter 9 and dc-link capacitance 3, the inverter controller 5 and SVG controller 6 of described net side inverter is in parallel Rear one end is connected with net side inverter 4, and the other end is connected with double-fed fan motor unit control system 7, double-fed fan motor unit allocation System 7 is also connected with dc bus switching switch 2.
Pusher side inverter 9 connects electromotor 11, electromotor 11 connecting fan impeller 10, and net side inverter 4 connects box liter Pressure transformer 12, net side inverter 4 is connected to electromotor 11 also by generator unit stator power output lead.
When blower fan is in stopped status, net side inverter 4 and dc-link capacitance 3 coordinate composition static reacance generator.
Net side inverter is configured with the control that two functions of inverter controller and SVG controller of net side inverter are different Device.
When net side inverter 4 is as static reacance generator, net side inverter is controlled by SVG controller 6.
Double-fed fan motor unit control system 7 connects wind energy turbine set master control system 8.
The working method of described net side inverter is selected according to operating states of the units by double-fed fan motor unit control system 7 Selecting: when unit normal power generation, inverter controller 5 run by normal change of current requirement Controling network side inverter, unit is the most defeated Go out active power and reactive power；When unit stops generating, disconnect dc bus switching switch 2, switch to by SVG controller 6 Controling network side inverters run, and net side inverter is become the outside output reactive power of SVG.
Concrete control strategy for net side controller is:
Double-fed fan motor unit is set current operational mode by wind energy turbine set master control system, changes according to operational mode switching net side Stream device controller also controls cut-offfing of switching switch.
Described Converter controller be Wind turbines properly functioning time use controller.
Shown in its governing equation such as formula (1):
u d = ( k i p + k i 1 s ) ( i d r e f - i d ) + ω s L g i q + u g d u q = ( k i p + k i 1 s ) ( i q r e f - i q ) - ω s L g i d i d r e f = ( k u p + k u 1 s ) ( u d c r e f - u d c ) - - - ( 1 )
In formula: LgFor the inductance of net side inverter series connection, ugdFor the direct-axis component of line voltage, ud、uqFor net side inverter The d-axis of voltage, quadrature axis component, for d-axis, the quadrature axis component of net side Inverter circuit, ωsFor synchronous angular velocity, kipFor electric current The proportion adjustment gain of internal ring, kilFor the integral adjustment gain of current inner loop, kupFor the proportion adjustment gain of outer voltage, kul For the integral adjustment gain of outer voltage, the amount with ref in footmark is the reference value of certain amount.
The controller used when side inverter operates in SVG pattern is netted when described SVG controller is compressor emergency shutdown.
The described control strategy in SVG controller comprises: 1) shown in converter Control equation such as formula (1)；2) calculate The algorithm of reactive-load compensation current reference value in formula (1).
The described algorithm calculating reactive-load compensation current reference value is as described below:
First determine whether that set grid-connection point voltage is whether within the scope of requiring.
When double-fed fan motor set grid-connection point voltage is in claimed range, first by phaselocked loop obtain set grid-connection point power because of Number angleAnd it is calculated power factorRecord amplitude I of set grid-connection point electric current afterwardss.Tried to achieve by formula (2) again Reference value I of the reactive-load compensation current amplitude under three-phase static coordinate systemref。
In formula: λrefFor set grid-connection point power factor reference value, by wind energy turbine set, operations staff gives, and fixes after giving more Constant.
Reference value i of reactive-load compensation electric current under three-phase static coordinate system is obtained again by formula (3)ref.In formulaBeing tried to achieve by set end voltage synchronizing signal cos ω t, this signal is by phase-locked acquisition.
In formula:For the power-factor angle reference value of set grid-connection point, by the λ in formula (2)refTry to achieve through anticosine.
Finally by the idle electricity under coordinate transform becomes biphase rotating coordinate system of the reference value under three-phase static coordinate system Stream reference value iqref。
When double-fed fan motor set grid-connection point voltage is beyond claimed range, first obtained set grid-connection point power by phaselocked loop Factor angleAnd it is calculated power factorRecord amplitude I of set grid-connection point electric current afterwardss.Afterwards by formula (4) Or formula (5) tries to achieve reference value I of the reactive-load compensation current amplitude under three-phase static coordinate systemref.Wherein, formula (4) is voltage The more computing formula during upper limit, formula (5) is voltage computing formula when getting over lower limit.
In formula: UsAmplitude for set grid-connection point voltage；It it is the system voltage upper limit；It it is system voltage Lower limit.
Finally by the idle electricity under coordinate transform becomes biphase rotating coordinate system of the reference value under three-phase static coordinate system Stream reference value iqref。
If net side inverter operates in SVG pattern and dc-link capacitance existing capacity cannot meet the damage netting side inverter Time-consumingly, by formula (6), capacitance can be recalculated, and dc-link capacitance is replaced.
C d c = K P d c _ o u t [ π 3 - a r c c o s ( 1 - α ) ] ωU N 2 ( 2 α - α 2 ) - - - ( 6 )
In formula:For bus capacitor output；α is busbar voltage landing percentage ratio；K is allowance coefficient, according to net Depending on the active loss situation of side inverter.
Transformation to double-fed fan motor unit converter circuit, is only to increase by one group of dc bus switching switch, even if needing Dc-link capacitance to be changed is only also the lifting to capacity, there is not technical problem.And the SVG controller newly increased, also There is not design and the difficulty manufactured.
If newly-built wind energy turbine set, can directly use this technology when design.
If old wind energy turbine set, can undergo technological transformation when device upgrade or renewal.
Although disclosing embodiment of the present utility model and accompanying drawing for the purpose of illustration, but those skilled in the art being permissible Understanding: without departing from this utility model and spirit and scope of the appended claims, various replacements, to change and modifications be all can Can, therefore, scope of the present utility model is not limited to embodiment and accompanying drawing disclosure of that.

Claims (5)

1. a Reactive Compensation in Wind Farm device based on double-fed wind generator machine networking side inverter, it is characterised in that: this device Including dc bus (1), dc bus switching switch (2), dc-link capacitance (3), net side inverter (4), net side inverter Inverter controller (5), SVG controller (6), double-fed fan motor unit control system (7) and pusher side inverter (9)；Described is straight Stream bus (1) one end is connected with pusher side inverter (9), and the other end is connected with net side inverter (4), and dc-link capacitance (3) fills Position between pusher side inverter (9) and net side inverter (4), dc-link capacitance (3) is connected between two dc bus, Dc bus switching switch (2) is contained on positive and negative bus between pusher side inverter (9) and dc-link capacitance (3), described net After the inverter controller (5) of side inverter and SVG controller (6) parallel connection, one end is connected with net side inverter (4), and the other end is with double Feedback control system of wind turbines (7) is connected, and double-fed fan motor unit control system (7) is also with dc bus switching switch (2) even Connect.
Reactive Compensation in Wind Farm device based on double-fed wind generator machine networking side inverter the most according to claim 1, its It is characterised by: pusher side inverter (9) connects electromotor (11), electromotor (11) connecting fan impeller (10), net side inverter (4) Connecting box booster transformer (12), net side inverter (4) is connected to electromotor also by generator unit stator power output lead (11).
Reactive Compensation in Wind Farm device based on double-fed wind generator machine networking side inverter the most according to claim 2, its Being characterised by: when blower fan is in stopped status, net side inverter (4) and dc-link capacitance (3) coordinate composition static reacance to send out Raw device.
4. fill according to the Reactive Compensation in Wind Farm based on double-fed wind generator machine networking side inverter described in claim 1,2 or 3 Put, it is characterised in that: when net side inverter (4) is as static reacance generator, net side inverter is controlled by SVG controller (6).
Reactive Compensation in Wind Farm device based on double-fed wind generator machine networking side inverter the most according to claim 1, its It is characterised by: double-fed fan motor unit control system (7) connects wind energy turbine set master control system (8).
CN201620819889.0U 2016-08-01 2016-08-01 Wind -powered electricity generation field reactive power compensator based on double -fed wind turbine generator system net side transverter Expired - Fee Related CN205882720U (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106451483A (en) * 2016-08-01 2017-02-22 郭权利 Double-fed wind turbine generator-based wind power plant reactive compensation apparatus and control method

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106451483A (en) * 2016-08-01 2017-02-22 郭权利 Double-fed wind turbine generator-based wind power plant reactive compensation apparatus and control method

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Granted publication date: 20170111

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