CN105449725A - Direct-drive wind generating set frequency crossing method and device - Google Patents
Direct-drive wind generating set frequency crossing method and device Download PDFInfo
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- CN105449725A CN105449725A CN201510974722.1A CN201510974722A CN105449725A CN 105449725 A CN105449725 A CN 105449725A CN 201510974722 A CN201510974722 A CN 201510974722A CN 105449725 A CN105449725 A CN 105449725A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/48—Controlling the sharing of the in-phase component
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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
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Abstract
The invention provides a direct-drive wind generating set frequency crossing method and device. The method comprises the following steps: detecting the frequency of a power grid in real time; and if the frequency of the power grid exceeds the upper and lower limit thresholds of a frequency control dead zone, controlling an energy storage module on a DC bus to carry out charging and discharging so as to adjust the active power output to the power grid by an inverter and enable the frequency of the power grid to return to a predetermined frequency range. According to the technical scheme, when the power grid frequency is abnormal, a wind generating set is controlled to provide forceful power support for the power grid so as to complete the frequency crossing process of the wind generating set.
Description
Technical field
The present invention relates to technical field of wind power, particularly relate to a kind of direct wind-driven generator class frequency traversing method and device.
Background technology
Along with the increase of installed capacity of wind-driven power, especially the extensive of wind-powered electricity generation concentrates access electrical network, greatly changes the function and position of wind-powered electricity generation in electric power system.The influencing each other to become of wind-powered electricity generation and electrical network is not allowed to ignore, the response characteristic of the wind power plant under grid fault conditions and very important especially on the impact of electrical network.
In practical power systems operative practice, electric network fault can cause wind farm grid-connected point voltage and frequency to change.Wherein, there is the following two kinds situation in the impact for the change of frequency:
In power system operation process, if some large power supplies are out of service suddenly, then can cause the sharply decline of mains frequency; If some large loads are out of service suddenly, then can cause the sharply rising of mains frequency.
For direct wind-driven generator group (being called for short " Wind turbines "), because pitch-controlled system is only just started working when wind speed is greater than rated wind speed (restriction for wheel speed and power output), therefore the pitch-controlled system of directly driven wind-powered unit is difficult to provide strong active power support when mains frequency is abnormal suddenly to electrical network.
Summary of the invention
Embodiments of the invention provide a kind of wind-driven generator class frequency traversing method and device, and to realize when mains frequency occurs abnormal, controlling Wind turbines provides strong active power to support to electrical network, completes the frequency crossing process of Wind turbines.
For achieving the above object, The embodiment provides a kind of direct wind-driven generator class frequency traversing method, comprising: the frequency of detection of grid in real time; If the frequency of described electrical network exceeds the upper and lower limit threshold value in FREQUENCY CONTROL dead band, then control the energy-storage module be arranged on DC bus and carry out discharge and recharge to adjust the active power that described inverter exports electrical network to, make the frequency of electrical network return scheduled frequency range.
Embodiments of the invention additionally provide a kind of direct wind-driven generator class frequency traversing device, comprising: controller and the energy-storage module be arranged on DC bus, and described controller comprises: frequency detection module, for the frequency of real-time detection of grid; Frequency adjustment module, if the frequency for described electrical network exceeds the upper and lower limit threshold value in FREQUENCY CONTROL dead band, then control the energy-storage module be arranged on DC bus and carry out discharge and recharge to adjust the active power that described inverter exports electrical network to, make the frequency of electrical network return scheduled frequency range.
The direct wind-driven generator class frequency traversing method that the embodiment of the present invention provides and device, by arranging energy-storage module on DC bus, frequency values adjustment energy-storage module according to real-time detection of grid carries out discharge and recharge thus adjusts the active power that inverter exports electrical network to, and then makes the frequency of electrical network return predetermined normal frequency scope.This programme not only can realize the frequency crossing process of Wind turbines, and utilizes the discharge and recharge active accommodation of energy-storage module Wind turbines to export the active power of electrical network to, to safeguarding that the normal table of mains frequency is played a supporting role.
Accompanying drawing explanation
Fig. 1 is the topological structure schematic diagram of direct wind-driven generator group major loop in prior art;
Fig. 2 is the power-balance relation schematic diagram that in Fig. 1, direct wind-driven generator group major loop passes through run duration in frequency;
Fig. 3 is the topological structure schematic diagram comprising the direct wind-driven generator group major loop of energy-storage module provided by the invention;
Fig. 4 is the power-balance relation schematic diagram that in Fig. 3, direct wind-driven generator group major loop passes through run duration in frequency;
Fig. 5 is the method flow diagram of a direct wind-driven generator class frequency traversing method provided by the invention embodiment;
Fig. 6 is the method flow diagram of another embodiment of direct wind-driven generator class frequency traversing method provided by the invention;
Fig. 7 is the method flow diagram of another embodiment of direct wind-driven generator class frequency traversing method provided by the invention;
Fig. 8 is that the directly driven wind-powered machine class frequency that the present invention adopts passes through control schematic diagram;
Fig. 9 is the method flow diagram of another embodiment of direct wind-driven generator class frequency traversing method provided by the invention;
Figure 10 is the method flow diagram carrying out energy storage control for energy-storage module provided by the invention;
Figure 11 is the structured flowchart of a direct wind-driven generator class frequency traversing device provided by the invention embodiment;
Figure 12 is the structured flowchart of another embodiment of direct wind-driven generator class frequency traversing device provided by the invention;
Figure 13 is the structured flowchart of charge adjusting unit provided by the invention;
Figure 14 is the structured flowchart of electric discharge regulon provided by the invention;
Figure 15 is the structured flowchart of energy storage regulation device embodiment provided by the invention.
Drawing reference numeral explanation
11-impeller, 12-magneto alternator, 13-rectifier, the voltage stabilizing of 14-DC side and power circuitry, 15-DC side bus capacitor, 16-DC side-discharging resistance, the preposition IGBT module of 17-electric power generation unloading resistance, 18-inverter, 19-filter inductance, 20-electrical network, 21-accessory power supply, 22-energy-storage travelling wave tube, 23-IGBT control switch, 31-controller, 32-energy-storage module, 311-frequency detection module, 312-frequency adjustment module, 33-energy storage electric quantity monitoring module, 34-energy storage electricity control module, 41-charge adjusting unit, 42-discharges regulon, 51-first measured power subelement, 52-first direct voltage is to stator unit, 53-charging current is to stator unit, 54-charging control wave subelement, 55-charging controls subelement, 61-second measured power subelement, 62-second direct voltage is to stator unit, 63-discharging current is to stator unit, 64-control of discharge pulse signal subelement, 65-control of discharge subelement.
Embodiment
In electric power system, the change of frequency depends on that power supply exports meritorious and that load consumption the is meritorious degree of balance.From power supply angle, need the power output increasing power supply when mains frequency reduces; Need when mains frequency increases to reduce output power of power supply.Otherwise, say from load perspective, need when mains frequency reduces to reduce load; Need when mains frequency increases to increase load.So just can ensure that electric power system normally runs continuously with rated frequency.
Fig. 1 is the topological structure schematic diagram of direct wind-driven generator group major loop in prior art.As shown in Figure 1, impeller 11 Direct driver magneto alternator 12 runs; Magneto alternator 12 output connects the rectifier 13 of generator side, rectifier 13, DC side voltage stabilizing and power circuitry 14 (comprising the preposition IGBT module 17 of DC side bus capacitor 15, DC side-discharging resistance 16 and electric power generation unloading resistance), grid side inverter 18 constitute full power convertor, inverter 18 output is connected with filter inductance 19, and filter inductance 19 output is connected to the grid 20; The accessory power supply 21 being connected to grid side is also comprised in Fig. 1.
Based on the Wind turbines major loop structure of Fig. 1, in Fig. 2, illustrate that direct wind-driven generator group major loop passes through the power-balance relation schematic diagram of run duration in frequency.As shown in Figure 2, have according to the flow direction of active power: the active power of output P of generator
gen=DC bus active-power P
dc=inverter exports the active-power P of electrical network to
grid, finally make: P
gen=P
grid(under the condition ignoring current transformer loss).
Final purpose of the present invention is: enable Wind turbines keep continuous interconnection to run under the mains frequency of exception, and participates in the urgent adjustment of mains frequency, and the frequency realizing Wind turbines passes through function.
Based on this object, as shown in Figure 3, this programme embodiment, on the basis of topological structure shown in Fig. 1, has set up the energy-storage module that can carry out discharge and recharge in the DC side of inverter.This energy storage device comprises energy-storage travelling wave tube 22 (as super capacitor) and two IGBT control switchs 23.IGBT control switch 23 carries out discharge and recharge by receiving outside control wave control energy-storage travelling wave tube 22.As shown in Figure 4, for this programme embodiment is on the basis of topological structure shown in Fig. 3, the direct wind-driven generator group major loop illustrated passes through the power-balance relation schematic diagram of run duration in frequency.Accordingly, when energy-storage travelling wave tube 22 charges, draw the electricity on DC bus thus decrease the active power that inverter 18 exports electrical network to; When energy-storage travelling wave tube 22 discharges, on DC bus, discharge electricity thus add the active power that inverter 18 exports electrical network to.The power that energy-storage travelling wave tube 22 is corresponding in charge and discharge process is P
sto.Have according to the flow direction of active power: the active power of output P of generator
gen+ power P
sto=inverter exports the active-power P of electrical network to
grid, finally make: P
gen+ P
sto=P
grid.Particularly, the P when energy-storage travelling wave tube 22 carries out charging process
stoget negative value, the P when energy-storage travelling wave tube 22 carries out discharge process
stoget on the occasion of.
Basic ideas of the present invention are: when mains frequency suddenlys change, give full play to the energy storage device 22 accessed in direct current mode, by the fast charging and discharging characteristic of such as super capacitor, under the condition not relying on wind regime, in quick adjustment Wind turbines, inverter exports the active power of electrical network to, and then the frequency realizing Wind turbines passes through function, and provide the supporting role that mains frequency is promptly regulated.
Below with reference to accompanying drawing, the direct wind-driven generator class frequency traversing method in this programme and device are described in detail.
Embodiment one
Fig. 5 is the method flow diagram of a direct wind-driven generator class frequency traversing method provided by the invention embodiment.
S510, the frequency of real-time detection of grid.
S520, if the frequency of electrical network exceeds the upper and lower limit threshold value in FREQUENCY CONTROL dead band, then controls the energy-storage module be arranged on DC bus and carries out discharge and recharge to adjust the active power that described inverter exports electrical network to, make the frequency of electrical network return scheduled frequency range.
According in table 1, GB GB/T19963-2011 is about shown in the adaptive technical requirement of wind-powered electricity generation running frequency: be in 49.5Hz ~ 50.2Hz at power system frequency, Wind turbines is normal operation continuously, and requires that when being less than 49.5Hz or be greater than 50.2Hz Wind turbines has the ability running set time section.This set time section is frequency and passes through the duration.
Table 1 GB GB/T19963-2011 is about the adaptive technical requirement of wind-powered electricity generation running frequency
In this programme, using the upper limit threshold of 50.2Hz as FREQUENCY CONTROL dead band, using the lower threshold of 49.5Hz as FREQUENCY CONTROL dead band, but not as limit.When the frequency of electrical network exceeds the upper and lower limit threshold value in FREQUENCY CONTROL dead band, then the Wind turbines characterizing current access electrical network needs to carry out frequency and passes through.
For improving the abnormal frequency of Wind turbines from original passive adaptation electrical network, recover normal to initiatively supporting the abnormal frequency improving electrical network.In the present embodiment, carry out discharge and recharge and adjust by controlling the energy-storage module be arranged on DC bus flexibly the active power that inverter exports electrical network to, the active power needed for load that Wind turbines is exported on the active power of electrical network and current electric grid is consistent, thus makes the frequency of electrical network return scheduled frequency range.Rated frequency under the stable state of this scheduled frequency range and Wind turbines, frequency range when Wind turbines as shown in table 1 normally runs: 49.5Hz ~ 50.2Hz.
Such as, if the frequency of electrical network is greater than the upper limit threshold in FREQUENCY CONTROL dead band, then characterize active power that current Wind turbines exports electrical network to and be greater than active power needed for grid side load, now, control energy-storage module to charge, the part electric energy on DC bus has been drawn due to charging process, because this reducing the active power that inverter exports electrical network to, thus the active power making Wind turbines export electrical network to preserves value consistent with the active power needed for grid side load, the frequency of electrical network returns scheduled frequency range.
Again such as, if the frequency of electrical network is less than the lower threshold in FREQUENCY CONTROL dead band, then characterize active power that current Wind turbines exports electrical network to and be less than active power needed for grid side load, now, control energy-storage module to discharge, because discharge process for carry additional electrical energy on DC bus, therefore improve the active power that inverter exports electrical network to, thus the active power making Wind turbines export electrical network to preserves value consistent with the active power needed for grid side load, the frequency of electrical network returns scheduled frequency range.
The direct wind-driven generator class frequency traversing method that the embodiment of the present invention provides, being in frequency at Wind turbines passes through in running, rise sharply according to the mains frequency of grid side collection/sink, by the fast charging and discharging characteristic of DC side energy-storage module, the active power finally making Wind turbines inject electrical network changes with the ANOMALOUS VARIATIONS of mains frequency, and the frequency achieving Wind turbines is passed through.
Embodiment two
In direct wind-driven generator group system, system with synchronous generator and the grid side of complete machine achieve full decoupled by current transformer DC loop on frequency and voltage parameter, the directly driven wind-powered machine class frequency of therefore specifying in the present invention is passed through in running, and the control mode when links such as the control mode of generator side rectifier, the control mode of fan paddle-changing system are normal with mains frequency is identical.The frequency state of passing through of Wind turbines can not bring extra mechanical shock and load to the drive system of Wind turbines.Therefore, direct wind-driven generator class frequency traversing method provided by the present invention that Wind turbines is possessed is a kind of frequency fault defensive ability/resistance ability that is smoother, safety, and ensure that Wind turbines not off-grid run continuously, be that one can realize directly driven wind-powered unit (for electrical network abnormal frequency fault) soft fault defensive ability/resistance ability scheme.
In conjunction with the vector control algorithm being applied to Wind turbines in prior art, the present embodiment provides control energy-storage module and carries out discharge and recharge to adjust the active power that inverter exports electrical network to, makes the frequency of electrical network return the algorithm conception of the concrete scheme of scheduled frequency range.
Suppose that grid side three-phase voltage balances, main circuit switch device is perfect switch, then the inverter model in two-phase synchronous rotating frame following (d axle is oriented to line voltage vector):
In above formula (3), u
d, u
qfor the dq axle component of inverter output voltage, L
sand R
sbe respectively inductance and the resistive component of inverter ac side induction reactance, N
sfor the electromagnetism rotating speed of line voltage, i
d, i
qfor the dq axle component of inverter output current, u
sdfor line voltage vector is (because d axle is oriented to line voltage vector, therefore u
sqbe zero).
In like manner, wind power unit converter side power output is as follows:
In above formula (4), P
gridand Q
gridbe respectively and be injected into the active power of grid side and the actual value of reactive power.
Through type (3) and (4) visible, the independent uneoupled control of active power and reactive power can be realized by controlling the dq axle component of power network current.
According to inverter Mathematical Modeling (above formula (3) and (4)), in conjunction with the operating characteristic of directly driven wind-powered unit under normal operation mode and failure operation pattern (frequency passes through operational mode), as shown in Figure 6 and Figure 7, the invention provides the method flow diagram of the other two kinds of embodiments of direct wind-driven generator class frequency traversing method, all can be considered specific implementation embodiment illustrated in fig. 5.Wherein, Fig. 6 carries out charging for control energy-storage module adjusting the embodiment of the method that inverter exports the active power of electrical network to, and Fig. 7 carries out discharging for control energy-storage module adjusting the embodiment of the method that inverter exports the active power of electrical network to.
As shown in Figure 6, this direct wind-driven generator class frequency traversing method comprises:
S610, gathers voltage, current value that inverter exports electrical network to, and calculates according to voltage, current value the active power measured value P that inverter exports electrical network to
grid.
Particularly, three-phase voltage U is gathered in grid side
a, U
b, U
cwith three-phase current I
a, I
b, I
c.The electric current and voltage value of collection is carried out ordinate transform, obtains the dq axle component under two-phase synchronous rotating frame, i.e. u
sd, u
sqand i
d, i
q(d axle is oriented to line voltage vector, therefore u
sqbe zero).
Then by above-mentioned formula (4), the active power measured value P that inverter exports electrical network to can be calculated
grid.
S620, chooses the first active power required value corresponding to the upper limit threshold in default FREQUENCY CONTROL dead band as active power set-point P
grid_ref, and by active power set-point P
grid_refwith active power measured value P
gridcarry out regulating calculation by pi regulator and obtain direct voltage set-point U
dc_ref.
As shown in Figure 8, be the Wind turbines FREQUENCY CONTROL schematic diagram that this programme adopts, there is shown the active power required value that Wind turbines under different mains frequency exports to grid side.When mains frequency is lower than fmin (corresponding active power is Pmax) or higher than fmax (corresponding active power is Pmin), Wind turbines directly trips; When frequency is at f2 (49.5Hz described above) ~ f3 (50.2Hz described above) (rated frequency is 50Hz), Wind turbines normally runs, and freely generates electricity according to wind regime, does not control Wind turbines active power; If mains frequency is less than f1 or is greater than f4, control can be passed through by initiation culture, the slope of real power control and deadline are determined (when frequency is less than f1 by grid-connected code or power scheduling department, active-power P available corresponding to real-time wind regime is less than Pmax, at this moment needs the electric discharge by energy-storage module to make to exert oneself close to Pmax in real time; When frequency is greater than f4, by charging or the measure such as shutdown, active power is reduced according to slope as shown in the figure); When frequency is at f1 ~ f2 or at f3 ~ f4, Wind turbines, according to grid-connected regulatory requirements, keeps networking operation within certain time interval, participates in the meritorious adjustment of stable state of wind energy turbine set if desired.
The present embodiment, based on the Wind turbines FREQUENCY CONTROL schematic diagram shown in Fig. 8, chooses the first active power required value (as P1) of upper limit threshold (50.2Hz described above) correspondence in default FREQUENCY CONTROL dead band as active power set-point P
grid_ref, and by active power set-point P
grid_refwith active power measured value P
gridcarry out regulating calculation by pi regulator and obtain direct voltage set-point U
dc_ref.This direct voltage set-point U
dc_refinitial value can choose arbitrarily near DC rated voltage.
S630, gathers the direct voltage measured value U of inverter direct-flow side
dc, and by direct voltage measured value U
dcwith direct voltage set-point U
dc_refthe charging current set-point I that regulating calculation obtains energy-storage module is carried out by pi regulator
s_ref.
S640, gathers the charging current measured value I of current energy-storage module
s, and by charging current measured value I
swith charging current set-point I
s_refcarrying out regulating calculation by pi regulator obtains current for controlling the control wave that energy-storage module carries out charging.
In actual mechanical process, if current energy-storage module carries out charging process, then corresponding charging current measured value I
sfor on the occasion of, on the contrary, if current energy-storage module carries out discharge process, then corresponding charging current measured value I
sfor negative value.
S650, is undertaken charging by the control wave control energy-storage module of charging and reduces the active power that inverter exports electrical network to.
Duty ratio in the control wave of above-mentioned charging refers to the duty ratio to energy-storage module charging.The charging can carrying out reasonable electricity to energy-storage module is set by suitable duty ratio, thus reduces the active power that inverter exports electrical network to.
Embodiment of the method shown in Fig. 6 is by rationally charging to energy-storage module, reduce the active power of inverter output valve electrical network, make Wind turbines export the active power of electrical network to consistent with the active power needed for grid side load, thus reduce mains frequency to normal range (NR).
As shown in Figure 7, another kind of direct wind-driven generator class frequency traversing method comprises:
S710, gathers voltage, current value that inverter exports electrical network to, and calculates according to electric current and voltage value the active power measured value P that described inverter exports electrical network to
grid.
S720, chooses the second active power required value corresponding to the lower threshold in default FREQUENCY CONTROL dead band as active power set-point P
grid_ref, and by active power set-point P
grid_refwith active power measured value P
gridcarry out regulating calculation by pi regulator and obtain direct voltage set-point U
dc_ref;
S730, gathers the direct voltage measured value U of inverter direct-flow side
dc, and by direct voltage measured value U
dcwith direct voltage set-point U
dc_refthe discharging current set-point I that regulating calculation obtains energy-storage module is carried out by pi regulator
s_ref.
Above-mentioned S710, S720 are corresponding identical with the content of S630 with aforementioned S610, S620 with the step content of S730, do not repeat at this.
S740, gathers the discharging current measured value I of current energy-storage module
s, and by discharging current measured value I
swith discharging current set-point I
s_refcarrying out regulating calculation by pi regulator obtains current for controlling the control wave that energy-storage module carries out discharging;
In actual mechanical process, if current energy-storage module carries out discharge process, then corresponding discharging current measured value I
sfor on the occasion of, on the contrary, if current energy-storage module carries out charging process, then corresponding discharging current measured value I
sfor negative value.
S750, controls this energy-storage module by the control wave of electric discharge and carries out discharging and improve the active power that inverter exports electrical network to.
Duty ratio in the control wave of above-mentioned electric discharge refers to the duty ratio to energy-storage module electric discharge.The electric discharge can carrying out reasonable electricity to energy-storage module is set by suitable duty ratio, thus increases the active power that inverter exports electrical network to.
Embodiment of the method shown in Fig. 7 is by rationally discharging to energy-storage module, improve the active power of inverter output valve electrical network, make Wind turbines export the active power of electrical network to consistent with the active power needed for grid side load, thus improve mains frequency to normal range (NR).
Fig. 9 is the method flow diagram of another embodiment of direct wind-driven generator class frequency traversing method provided by the invention.The method embodiment illustrates with the form of control flow chart and adjusts by carrying out discharge and recharge to energy-storage module the active power that inverter exports electrical network to.As shown in Figure 9, this direct wind-driven generator class frequency traversing method is:
First, the voltage and current value U that inverter exports electrical network to is gathered
a, U
b, U
c, I
a, I
b, I
c.The electric current and voltage value of collection is carried out ordinate transform, obtains the dq axle component under two-phase synchronous rotating frame, i.e. u
sd, u
sqand i
d, i
q(d axle is oriented to line voltage vector, therefore u
sqbe zero).This process need is undertaken phase-locked by such as phase-locked loop (PhaseLockedLoop, PLL), obtains the phase angle θ of grid side voltage vector.Formula (4) calculating inverter is utilized to export the active power measured value P of electrical network to according to electric current and voltage value
grid.
Then, active power required value corresponding to the upper and lower limit threshold value in default FREQUENCY CONTROL dead band (i.e. the performance number of grid-connected code technical requirement) is chosen as active power set-point P
grid_ref, and by active power set-point P
grid_refwith active power measured value P
gridcarry out regulating calculation by pi regulator and obtain direct voltage set-point U
dc_ref.
Next, the direct voltage measured value U of inverter direct-flow side is gathered
dc, and by direct voltage measured value U
dcwith direct voltage set-point U
dc_refthe charging and discharging currents set-point I that regulating calculation obtains energy-storage module is carried out by pi regulator
s_ref.By charging and discharging currents measured value I
swith charging and discharging currents set-point I
s_refcarry out regulating calculation by pi regulator and obtain the current control wave D carrying out discharge and recharge for controlling energy-storage module.
Finally, control energy-storage module by the control wave of discharge and recharge and carry out discharge and recharge to reduce or improve the active power that inverter exports electrical network to, realize the object of electric power grid frequency stabilization to normal frequency scope.
Further, carry out in the process of discharge and recharge in reality to energy-storage module, the energy-storage travelling wave tube in energy-storage module must possess the ability of charging or electric discharge in real time, and namely energy-storage travelling wave tube possesses the electricity needed for certain electric discharge, also has vacant capacity to be used for charging simultaneously.In order to ensure in Wind turbines frequency crossing process, energy-storage module can carry out discharge and recharge freely to maintain the active power that Wind turbines exports electrical network to.The present embodiment also can perform the method step carrying out energy storage control for energy-storage module as shown in Figure 10 on the basis of said method embodiment.As shown in Figure 10, the method comprises:
S101, the energy storage electricity of Real-Time Monitoring energy-storage module.
For the electricity in energy-storage module stored by energy-storage travelling wave tube, can when each charge or discharge by energy-storage travelling wave tube both end voltage over time rate calculate.The method of this programme to the energy storage electricity of monitoring energy-storage module is not construed as limiting.
S102, if energy storage electricity is lower than the first preset value, then controls to be charged to energy-storage module by DC bus; Further, if energy storage electricity is higher than the second preset value, then controls to carry this energy-storage module by DC bus and discharge.
Such as, when the active power that Wind turbines generator produces is larger, need not be gained merit by electric power generation unloading resistance consumption, but directly can fill and carry out stored energy to energy-storage module.When the active power that Wind turbines generator produces is less, also the energy of energy-storage module suitably can be discharged to current transformer DC side, thus be delivered to inverter and complete electric discharge.So, by carrying out the conservative control of energy storage electricity to energy-storage module, can guarantee in Wind turbines frequency crossing process, energy-storage module can carry out discharge and recharge freely to maintain the active power that Wind turbines exports electrical network to.
The direct wind-driven generator class frequency traversing method that the present embodiment provides, on basis embodiment illustrated in fig. 5, in conjunction with the vector control algorithm of Wind turbines, gives the specific implementation controlling energy-storage module discharge and recharge.Meanwhile, carry out control adjustment guarantee in Wind turbines frequency crossing process for the electricity in energy-storage module stored by energy-storage travelling wave tube, energy-storage module can carry out discharge and recharge freely to maintain the active power that Wind turbines exports electrical network to.
The above; be only the specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, is anyly familiar with those skilled in the art in the technical scope that the present invention discloses; change can be expected easily or replace, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of described claim.
Embodiment three
Figure 11 is the structural representation of a direct wind-driven generator class frequency traversing device provided by the invention embodiment, can be used for performing method step embodiment illustrated in fig. 5, as shown in figure 11, this direct wind-driven generator class frequency traversing device comprises: controller 31 and the energy-storage module 32 be arranged on DC bus, and controller 31 comprises:
Frequency detection module 311, for the frequency of real-time detection of grid; Frequency adjustment module 312, if the frequency for electrical network exceeds the upper and lower limit threshold value in FREQUENCY CONTROL dead band, then control the energy-storage module be arranged on DC bus and carry out discharge and recharge to adjust the active power that inverter exports electrical network to, make the frequency of electrical network return scheduled frequency range.
Further, as shown in figure 12, in above-mentioned direct wind-driven generator class frequency traversing device, frequency adjustment module 312 comprises:
Charge adjusting unit 41, if the upper limit threshold being greater than FREQUENCY CONTROL dead band for the frequency of electrical network, then controls energy-storage module 32 and carries out charging to reduce the active power that inverter exports electrical network to; Electric discharge regulon 42, if be less than the lower threshold in FREQUENCY CONTROL dead band for the frequency of electrical network, then control energy-storage module 32 and carries out discharging to improve the active power that described inverter exports electrical network to.
Further, as shown in figure 13, charge adjusting unit 41 comprises: the first measured power subelement 51, exports the voltage of electrical network, current value to for gathering inverter, and calculates according to electric current and voltage value the active power measured value P that this inverter exports electrical network to
grid; First direct voltage is to stator unit 52, and the first active power required value corresponding to the upper limit threshold for choosing default FREQUENCY CONTROL dead band is as active power set-point P
grid_ref, and by active power set-point P
grid_refwith active power measured value P
gridcarry out regulating calculation by pi regulator and obtain direct voltage set-point U
dc_ref; Charging current to stator unit 53, for gathering the direct voltage measured value U of inverter direct-flow side
dc, and by direct voltage measured value U
dcwith direct voltage set-point U
dc_refthe charging current set-point I that regulating calculation obtains energy-storage module 32 is carried out by pi regulator
s_ref; Charging control wave subelement 54, for gathering the charging current measured value I of current energy-storage module 32
s, and by charging current measured value I
swith charging current set-point I
s_refcarrying out regulating calculation by pi regulator obtains current for controlling the control wave that energy-storage module 32 carries out charging; Charging controls subelement 55, reduces for being undertaken charging by the control wave control energy-storage module 32 of charging the active power that inverter exports electrical network to.
Further, as shown in figure 14, above-mentioned electric discharge regulon 42 comprises: the second measured power subelement 61, exports the voltage of electrical network, current value to for gathering inverter, and calculates according to electric current and voltage value the active power measured value P that inverter exports electrical network to
grid; Second direct voltage is to stator unit 62, and the second active power required value corresponding to the lower threshold for choosing default FREQUENCY CONTROL dead band is as active power set-point P
grid_ref, and by active power set-point P
grid_refwith active power measured value P
gridcarry out regulating calculation by pi regulator and obtain direct voltage set-point U
dc_ref; Discharging current to stator unit 63, for gathering the direct voltage measured value U of inverter direct-flow side
dc, and by direct voltage measured value U
dcwith direct voltage set-point U
dc_refthe discharging current set-point I that regulating calculation obtains energy-storage module 32 is carried out by pi regulator
s_ref; Control of discharge pulse signal subelement 64, for gathering the discharging current measured value I of current energy-storage module 32
s, and by this discharging current measured value I
swith discharging current set-point I
s_refcarrying out regulating calculation by pi regulator obtains current for controlling the control wave that energy-storage module 32 carries out discharging; Control of discharge subelement 65, improves for being undertaken discharging by the control wave control energy-storage module 32 of electric discharge the active power that inverter exports electrical network to.
Further, as shown in figure 15, also energy storage regulation device can be comprised in above-mentioned direct wind-driven generator class frequency traversing device: comprise energy storage electric quantity monitoring module 33 and energy storage electricity control module 34;
Energy storage electric quantity monitoring module 33, for the energy storage electricity of Real-Time Monitoring energy-storage module; Energy storage electricity control module 34, if for energy storage electricity lower than the first preset value, then controls to be charged to energy-storage module by DC bus; Further, if energy storage electricity is higher than the second preset value, then control to be discharged by DC bus carrying energy-storage module.
Above-mentioned Fig. 6, Fig. 7, method step embodiment illustrated in fig. 9 are complete by the structure of Figure 12 ~ embodiment illustrated in fig. 15, do not repeat step principle at this.
The direct wind-driven generator class frequency traversing device that the embodiment of the present invention provides, being in frequency at Wind turbines passes through in running, rise sharply according to the mains frequency of grid side collection/sink, by the fast charging and discharging characteristic of DC side energy-storage module, the active power finally making Wind turbines inject electrical network changes with the ANOMALOUS VARIATIONS of mains frequency, and the frequency achieving Wind turbines is passed through.
Further, this programme, in conjunction with the vector control algorithm of Wind turbines, gives the specific implementation controlling energy-storage module discharge and recharge.Meanwhile, carry out control adjustment guarantee in Wind turbines frequency crossing process for the electricity in energy-storage module stored by energy-storage travelling wave tube, energy-storage module can carry out discharge and recharge freely to maintain the active power that Wind turbines exports electrical network to.
Last it is noted that above each embodiment is only in order to illustrate technical scheme of the present invention, be not intended to limit; Although with reference to foregoing embodiments to invention has been detailed description, those of ordinary skill in the art is to be understood that: it still can be modified to the technical scheme described in foregoing embodiments, or carries out equivalent replacement to wherein some or all of technical characteristic; And these amendments or replacement, do not make the essence of appropriate technical solution depart from the scope of various embodiments of the present invention technical scheme.
Claims (10)
1. a direct wind-driven generator class frequency traversing method, is characterized in that, comprising:
The frequency of real-time detection of grid;
If the frequency of described electrical network exceeds the upper and lower limit threshold value in FREQUENCY CONTROL dead band, then control the energy-storage module be arranged on DC bus and carry out discharge and recharge to adjust the active power that inverter exports electrical network to, make the frequency of electrical network return scheduled frequency range.
2. method according to claim 1, it is characterized in that, if the frequency of described electrical network exceeds the upper and lower limit threshold value in FREQUENCY CONTROL dead band, then control the energy-storage module be arranged on DC bus and carry out discharge and recharge to adjust the active power that inverter exports electrical network to, comprising:
If the frequency of described electrical network is greater than the upper limit threshold in FREQUENCY CONTROL dead band, then controls described energy-storage module and carry out charging to reduce the active power that described inverter exports electrical network to;
If the frequency of described electrical network is less than the lower threshold in FREQUENCY CONTROL dead band, then controls described energy-storage module and carry out discharging to improve the active power that described inverter exports electrical network to.
3. method according to claim 2, is characterized in that, if the frequency of described electrical network is greater than the upper limit threshold in FREQUENCY CONTROL dead band, then controls described energy-storage module and carries out charging reducing the active power that described inverter exports electrical network to and comprise:
Gather voltage, current value that described inverter exports electrical network to, and calculate according to described voltage, current value the active power measured value P that described inverter exports electrical network to
grid;
Choose the first active power required value corresponding to the upper limit threshold in default described FREQUENCY CONTROL dead band as active power set-point P
grid_ref, and by described active power set-point P
grid_refwith described active power measured value P
gridcarry out regulating calculation by pi regulator and obtain direct voltage set-point U
dc_ref;
Gather the direct voltage measured value U of described inverter direct-flow side
dc, and by described direct voltage measured value U
dcwith described direct voltage set-point U
dc_refthe charging current set-point I that regulating calculation obtains described energy-storage module is carried out by pi regulator
s_ref;
Gather the charging current measured value I of current described energy-storage module
s, and by described charging current measured value I
swith described charging current set-point I
s_refcarrying out regulating calculation by pi regulator obtains current for controlling the control wave that described energy-storage module carries out charging;
Control described energy-storage module by the control wave of described charging to carry out charging and reduce the active power that described inverter exports electrical network to.
4. method according to claim 2, is characterized in that, if the frequency of described electrical network is less than the lower threshold in FREQUENCY CONTROL dead band, then controls described energy-storage module and carries out discharging improving the active power that described inverter exports electrical network to and comprise:
Gather voltage, current value that described inverter exports electrical network to, and calculate according to described electric current and voltage value the active power measured value P that described inverter exports electrical network to
grid;
Choose the second active power required value corresponding to the lower threshold in default described FREQUENCY CONTROL dead band as active power set-point P
grid_ref, and by described active power set-point P
grid_refwith described active power measured value P
gridcarry out regulating calculation by pi regulator and obtain direct voltage set-point U
dc_ref;
Gather the direct voltage measured value U of described inverter direct-flow side
dc, and by described direct voltage measured value U
dcwith described direct voltage set-point U
dc_refthe discharging current set-point I that regulating calculation obtains described energy-storage module is carried out by pi regulator
s_ref;
Gather the discharging current measured value I of current described energy-storage module
s, and by described discharging current measured value I
swith described discharging current set-point I
s_refcarrying out regulating calculation by pi regulator obtains current for controlling the control wave that described energy-storage module carries out discharging;
Control described energy-storage module by the control wave of described electric discharge to carry out discharging and improve the active power that described inverter exports electrical network to.
5. the method according to any one of claim 1-4, is characterized in that, described method also comprises:
The energy storage electricity of energy-storage module described in Real-Time Monitoring;
If described energy storage electricity is lower than the first preset value, then control to be charged to described energy-storage module by DC bus; Further, if described energy storage electricity is higher than the second preset value, then controls to carry described energy-storage module by DC bus and discharge.
6. a direct wind-driven generator class frequency traversing device, is characterized in that, comprising: controller and the energy-storage module be arranged on DC bus, and described controller comprises:
Frequency detection module, for the frequency of real-time detection of grid;
Frequency adjustment module, if the frequency for described electrical network exceeds the upper and lower limit threshold value in FREQUENCY CONTROL dead band, then control the energy-storage module be arranged on DC bus and carry out discharge and recharge to adjust the active power that inverter exports electrical network to, make the frequency of electrical network return scheduled frequency range.
7. device according to claim 6, is characterized in that, described frequency adjustment module comprises:
Charge adjusting unit, if the upper limit threshold being greater than FREQUENCY CONTROL dead band for the frequency of described electrical network, then controls described energy-storage module and carries out charging to reduce the active power that described inverter exports electrical network to;
Electric discharge regulon, if be less than the lower threshold in FREQUENCY CONTROL dead band for the frequency of described electrical network, then control described energy-storage module and carries out discharging to improve the active power that described inverter exports electrical network to.
8. device according to claim 7, is characterized in that, described charge adjusting unit comprises:
First measured power subelement, exports the voltage of electrical network, current value to for gathering described inverter, and calculates according to described electric current and voltage value the active power measured value P that described inverter exports electrical network to
grid;
First direct voltage is to stator unit, and the first active power required value corresponding to the upper limit threshold for choosing default described FREQUENCY CONTROL dead band is as active power set-point P
grid_ref, and by described active power set-point P
grid_refwith described active power measured value P
gridcarry out regulating calculation by pi regulator and obtain direct voltage set-point U
dc_ref;
Charging current to stator unit, for gathering the direct voltage measured value U of described inverter direct-flow side
dc, and by described direct voltage measured value U
dcwith described direct voltage set-point U
dc_refthe charging current set-point I that regulating calculation obtains described energy-storage module is carried out by pi regulator
s_ref;
Charging control wave subelement, for gathering the charging current measured value I of current described energy-storage module
s, and by described charging current measured value I
swith described charging current set-point I
s_refcarrying out regulating calculation by pi regulator obtains current for controlling the control wave that described energy-storage module carries out charging;
Charging controls subelement, carries out charging and reduces for being controlled described energy-storage module by the control wave of described charging the active power that described inverter exports electrical network to.
9. device according to claim 7, is characterized in that, described electric discharge regulon comprises:
Second measured power subelement, exports the voltage of electrical network, current value to for gathering described inverter, and calculates according to described electric current and voltage value the active power measured value P that described inverter exports electrical network to
grid;
Second direct voltage is to stator unit, and the second active power required value corresponding to the lower limit valve for choosing default described FREQUENCY CONTROL dead band is as active power set-point P
grid_ref, and by described active power set-point P
grid_refwith described active power measured value P
gridcarry out regulating calculation by pi regulator and obtain direct voltage set-point U
dc_ref;
Discharging current to stator unit, for gathering the direct voltage measured value U of described inverter direct-flow side
dc, and by described direct voltage measured value U
dcwith described direct voltage set-point U
dc_refthe discharging current set-point I that regulating calculation obtains described energy-storage module is carried out by pi regulator
s_ref;
Control of discharge pulse signal subelement, for gathering the discharging current measured value I of current described energy-storage module
s, and by described discharging current measured value I
swith described discharging current set-point I
s_refcarrying out regulating calculation by pi regulator obtains current for controlling the control wave that described energy-storage module carries out discharging;
Control of discharge subelement, is carried out discharging and improves for being controlled described energy-storage module by the control wave of described electric discharge the active power that described inverter exports electrical network to.
10. the device according to any one of claim 6-9, is characterized in that, described device also comprises:
Energy storage electric quantity monitoring module, for the energy storage electricity of energy-storage module described in Real-Time Monitoring;
Energy storage electricity control module, if for described energy storage electricity lower than the first preset value, then controls to be charged to described energy-storage module by DC bus; Further, if described energy storage electricity is higher than the second preset value, then controls to carry described energy-storage module by DC bus and discharge.
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