CN102868178A - Method for improving grid-connected transient stability in wind power plant voltage automatic control system - Google Patents
Method for improving grid-connected transient stability in wind power plant voltage automatic control system Download PDFInfo
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Abstract
The utility model provides a method for improving grid-connected transient stability in wind power plant voltage automatic control system, wind power plant AVC system includes AVC controller, a plurality of fan master control system, SVC, a plurality of voltage transformer and current transformer, and every wind-powered electricity generation collects the circuit and is connected with a plurality of fans, and the AVC controller communicates with each fan master control system to be connected to a plurality of voltage transformer and current transformer electrically, the method includes: the AVC controller determines whether the voltage of a grid-connected PCC point of the wind power plant is suddenly reduced; when the voltage of the PCC point is suddenly reduced, the AVC controller locks the control of the AVC system of the wind power plant after waiting for a first preset time; when the SVC is absorbing reactive power, the AVC controller sends a control command to make the SVC stop absorbing reactive power; the AVC controller determines whether the PCC point voltage rises above a particular threshold within a second predetermined time after the sudden drop occurs; the AVC controller resumes control of the wind farm AVC system when the PCC point voltage rises above a particular threshold within a second predetermined time.
Description
Technical field
The present invention relates to the wind energy turbine set dynamic electric voltage and automatically control (AVC), more particularly, relate to a kind of method that in wind energy turbine set AVC system, improves wind farm grid-connected transient stability.
Background technology
Along with the development of technology, the concern of regenerative resource and utilize degree day by day to increase, wherein, wind power generation is a kind of relatively ripe energy technology that developed.Yet the development plan that China's wind-powered electricity generation industry " is built large base, incorporated large electrical network " and Europe " dispersion online, on-site elimination " difference have the characteristics such as " on a large scale ", " high concentrating ".Intermittent wind-powered electricity generation causes voltage ripple of power network, and system short circuit capacity increases, and transient stability sexually revises, and concentrates in the access electrical network situation particularly outstanding at large-scale wind power especially.Simultaneously, the terminal quality of power supply of electrical network also can affect wind energy turbine set, and for example grid disturbance causes blower fan off-grid, wind energy turbine set off-the-line, and unbalance voltage can cause unit vibration, overheated etc.
Study wind farm grid-connected key problem in technology, be wind energy turbine set is analyzed as an integral unit access electrical network, by improving the wind farm grid-connected some stability of (being called for short PCC), improve with the performance that is incorporated into the power networks that realizes whole wind energy turbine set.
The stable most important index that PCC is ordered is voltage stability.Voltage fluctuation has directly affected the safe and stable operation of blower fan, endangers even involves the electric power networks that accesses.According to the tidal current analysis technology as can be known, the PCC voltage of ordering is affected by the reactive power of this point mainly: when consume lagging reactive power (being absorbing reactive power) too much the time voltage will descend; Otherwise, when send lagging reactive power (namely sending reactive power) too much the time voltage will rise.Reactive power dynamic equilibrium by some technology control PCC is ordered can reach the stable effect of control PCC point voltage.
Yet, in the prior art, the reactive power equilibrium that control wind energy turbine set PCC is ordered can be subject to two technology point restrictions: at first must satisfy China's Power System Reactive Power " layering and zoning " control principle, secondly must take into full account the control mechanism in wind energy turbine set reactive power source.
Wind energy turbine set reactive power source mainly contains two kinds: blower fan and concentrated reactive-load compensation equipment.Concentrate reactive-load compensation equipment, for example Static VAR Compensation (SVC) has played active and effective effect to the reactive power equilibrium of wind energy turbine set, and cost is high, loss large and the defective of poor stability but also exist, and SVC and fan operation are worked poor.On the other hand, blower fan has the ability of additionally sending reactive power, but the free control of single blower fan can cause the in-fighting of wind energy turbine set reactive power, can't reach the specified control target.Wind energy turbine set voltage is controlled (AVC) system automatically can excavate the ability that the wind energy turbine set inner blower sends reactive power, cooperates with SVC, makes the wind energy turbine set reactive power reach better dynamic equilibrium.
Fig. 1 is the topological schematic diagram that the voltage-controlled wind energy turbine set AVC system that concentrates according to the dependence of prior art that reactive power compensating apparatus realizes that PCC orders is shown.
As shown in Figure 1, in the wind energy turbine set AVC system according to prior art, the SVC circuit that many wind-powered electricity generations compile circuit 1-N (every wind-powered electricity generation compiles circuit and comprises a plurality of blower fans) and are provided with SVC is linked into low-voltage bus bar, voltage on the low-voltage bus bar boosts via transformer, the access high voltage bus, then send circuit via the PCC point by wind-powered electricity generation and access large electrical network, thereby realize wind farm grid-connected, wherein, SVC is according to the change in voltage of low-voltage bus bar and/or high voltage bus, automatically send reactive power or absorbing reactive power, thereby regulate the voltage that PCC is ordered.
Although SVC has the ability that improves wind farm grid-connected transient stability, SVC still has many shortcomings: (1) SVC cost is high, so design capacity is limited, regulating power is limited; (2) along with lower voltage, the ability that SVC sends reactive power descends, so be difficult to ensure regulating effect when voltage reduces suddenly; (3) combined SVC impulse current when regulating is large, particularly when switched capacitor, reactor impulse current up to specified more than two times; (4) SVC mismatches blower fan low-voltage crossing function, and this can cause that voltage overregulates or the less stress joint.For this reason, need to provide a kind of method that can in wind energy turbine set AVC system, make the wind energy turbine set reactive power reach better dynamic equilibrium and improve wind farm grid-connected transient stability.
Summary of the invention
Many aspects of the present invention are to address the above problem at least and/or shortcoming, and advantage described below is provided at least.Therefore, an aspect of of the present present invention is to provide the method that improves the transient stability that is incorporated into the power networks in a kind of wind energy turbine set Voltage Automatic Control System.
According to an aspect of the present invention, provide a kind of wind energy turbine set voltage automatically to control the method that improves the transient stability that is incorporated into the power networks in (AVC) system, described wind energy turbine set Voltage Automatic Control System comprises the AVC controller, be arranged on a plurality of blower fan master control systems on a plurality of blower fans in the wind energy turbine set, Static VAR Compensation SVC, be arranged on wind-powered electricity generation and send circuit, wind-powered electricity generation compiles circuit, the SVC circuit, a plurality of voltage transformer summation current transformers on high voltage bus and the low-voltage bus bar, wherein, every wind-powered electricity generation compiles connection a plurality of blower fans, the AVC controller is communicated by letter with each blower fan master control system by fiber optic network, and be electrically connected to described a plurality of voltage transformer summation current transformer, said method comprising the steps of: (A) the AVC controller determines whether wind farm grid-connected PCC point voltage reduces suddenly; (B) when the AVC controller determines that the PCC point voltage reduces suddenly, the AVC controller after waiting for for first scheduled time locking wind energy turbine set AVC system to the control of wind energy turbine set; (C) when the AVC controller was determined SVC just at absorbing reactive power, the AVC controller sends control command so that SVC stops absorbing reactive power; (D) the AVC controller determines that whether the PCC point voltage rises on the certain threshold level in second scheduled time after occuring to reduce suddenly; (E) when the AVC controller determines that the PCC point voltage rises on the described certain threshold level within second scheduled time, the AVC controller recovers wind energy turbine set AVC system to the control of wind energy turbine set.
In addition, described method also can may further comprise the steps: (F) when the AVC controller determines that the PCC point voltage does not rise on the described certain threshold level within second scheduled time, the AVC controller recovers wind energy turbine set AVC system to the control of wind energy turbine set after waiting for for the 3rd scheduled time.
In addition, the 3rd scheduled time can begin from the moment that the PCC point voltage occurs to reduce suddenly to calculate.
In addition, the AVC controller can determine whether the PCC point voltage reduces suddenly according to the voltage data that wind-powered electricity generation sends the voltage transformer on the circuit and provide is provided.
In addition, when PCC point voltage decline rate of change is high, and the PCC point voltage drops to first threshold when following, and the AVC controller can determine that the PCC point voltage reduces suddenly.
In addition, when PCC point voltage decline rate of change is higher than 0.7 times of rated voltage/second, and the PCC point voltage is when being lower than 0.8 times of rated voltage, and the AVC controller can determine that the PCC point voltage reduces suddenly.
In addition, first scheduled time can be 20 milliseconds, and second scheduled time can be 5 seconds, and described certain threshold level can be 0.9 times of rated voltage.
In addition, the 3rd scheduled time can be 8-10 second.
In addition, the AVC controller can determine that SVC just still sends reactive power at absorbing reactive power based on voltage data and circuit data that the voltage transformer summation current transformer that is arranged on the SVC circuit provides.
According to an aspect of the present invention, provide a kind of wind energy turbine set voltage automatically to control the method that improves the transient stability that is incorporated into the power networks in the AVC system, described wind energy turbine set Voltage Automatic Control System comprises the AVC controller, be arranged on a plurality of blower fan master control systems on a plurality of blower fans in the wind energy turbine set, Static VAR Compensation SVC, be arranged on wind-powered electricity generation and send circuit, wind-powered electricity generation compiles circuit, the SVC circuit, a plurality of voltage transformer summation current transformers on high voltage bus and the low-voltage bus bar, wherein, every wind-powered electricity generation compiles connection a plurality of blower fans, the AVC controller is communicated by letter with each blower fan master control system by fiber optic network, and be electrically connected to described a plurality of voltage transformer summation current transformer, said method comprising the steps of: (A) the AVC controller determines whether wind farm grid-connected PCC point voltage rises suddenly; (B) when the AVC controller determines that the PCC point voltage rises suddenly, the AVC controller is given an order to each blower fan master control system, so that each blower fan stops to send reactive power after waiting for for first scheduled time; (C) when the AVC controller determined to send reactive power such as SVC, the AVC controller sends control command so that SVC stops to send reactive power; (D) the AVC controller is after waiting for for second scheduled time, and the AVC controller recovers wind energy turbine set AVC system to the control of the reactive power of wind energy turbine set.
In addition, second scheduled time can begin from the moment that the PCC point voltage occurs to rise suddenly to calculate.
In addition, the AVC controller can be sent voltage data that the voltage transformer on the circuit provides or determine according to the voltage data that the voltage transformer that is arranged on the low-voltage bus bar provides whether the PCC point voltage rises suddenly according to being arranged on wind-powered electricity generation.
In addition, when PCC point voltage rising rate of change is high, and the PCC point voltage rises to described first threshold when above, and the AVC controller can determine that the PCC point voltage rises suddenly.
In addition, when PCC point voltage rising rate of change is higher than 0.5 times of rated voltage/second, and the PCC point voltage is when being higher than 1.1 times of rated voltages, and the AVC controller can determine that the PCC point voltage rises suddenly.
In addition, first scheduled time can be 20 milliseconds, and first threshold can be 1.1 times of rated voltages, and second scheduled time can be 5 seconds.
In addition, the AVC controller can determine that SVC just still sends reactive power at absorbing reactive power based on voltage data and circuit data that the voltage transformer summation current transformer that is arranged on the SVC circuit provides.
According to the present invention, by synchronous detection short trouble and temporary latch, so that wind energy turbine set AVC system has taken into account the characteristics of blower fan low-voltage crossing function, the suddenly trend of reduction of point voltage has suppressed again to be incorporated into the power networks; By in the high voltage situation with the cooperating of SVC, the trend that the point voltage that suppressed to be incorporated into the power networks raises has suddenly absorbed excessive reactive power in the regional power grid; By with the cooperation of SVC, increased the total reactive power quick adjustment scope of wind energy turbine set, increased the transient stability of wind energy turbine set access Grid; The fluctuation of voltage has improved the fan operation environment during by the inhibition fault, has reduced the generation of large tracts of land off-grid event or chain reaction.
Description of drawings
By the description of embodiment being carried out below in conjunction with accompanying drawing, these and/or other aspect of the present invention and advantage will become clear and be easier to and understand, wherein:
Fig. 1 is the topological schematic diagram that the voltage-controlled wind energy turbine set AVC system that concentrates according to the dependence of prior art that reactive power compensating apparatus realizes that PCC orders is shown;
Fig. 2 is the diagram that illustrates according to the wind energy turbine set AVC system of the embodiment of the invention;
Fig. 3 is the flow chart that improves the method for the transient stability that is incorporated into the power networks in wind energy turbine set AVC system that illustrates according to the embodiment of the invention;
Fig. 4 illustrates the flow chart that improves according to another embodiment of the present invention the method for the transient stability that is incorporated into the power networks in wind energy turbine set AVC system.
Embodiment
Now the embodiment of the invention is described in detail, its example shown in the accompanying drawings, wherein, identical label represents same parts all the time.Below with reference to the accompanying drawings embodiment is described to explain the present invention.
Fig. 2 is the diagram that illustrates according to the wind energy turbine set AVC system of the embodiment of the invention.
As shown in Figure 2, wind energy turbine set AVC system according to the embodiment of the invention can comprise the AVC controller, (for example be arranged on a plurality of blower fan master control systems on a plurality of blower fans, concentrated reactive-load compensation equipment, SVC) and be arranged on that wind-powered electricity generation is sent circuit, wind-powered electricity generation compiles a plurality of voltage transformer summation current transformers on circuit, SVC circuit, high voltage bus and the low-voltage bus bar, the AVC controller is communicated by letter with each blower fan master control system by fiber optic network, and is electrically connected to described a plurality of voltage transformer summation current transformer.Specifically, voltage data and current data that AVC controller receiver voltage instrument transformer summation current transformer detects, and the various data (for example, the temperature of the voltage data of blower fan port, current data, active power, blower fan and fault message etc.) of the blower fan self that reception blower fan master control system provides.In addition, the AVC controller sends to each blower fan master control system with control signal, each blower fan master control system is controlled current transformer in the corresponding blower fan according to control signal, so that have angle between the electric current of corresponding blower fan port and the voltage, thus corresponding blower fan can send reactive power or absorbing reactive power, wherein, when electric current is led over voltage, blower fan sends reactive power, when electric current lags behind voltage, and the blower fan absorbing reactive power.
Selectively, the AVC controller can be realized by various power screen cabinets.In addition, wind energy turbine set AVC system according to the embodiment of the invention also can comprise for the AVC main website that carries out Long-distance Control, the quantity of described AVC main website is unrestricted, away from any position of wind energy turbine set (for example can be arranged on, city-level power control center, provincial power control center etc.), and communicate by letter with the AVC controller and the AVC controller is carried out Long-distance Control by the wired or wireless communication mode.The AVC main website can be realized by computer.In addition, the wind energy turbine set AVC system according to the embodiment of the invention also can comprise for the AVC supervising device of monitoring the AVC running status.The AVC supervising device can be realized by computer.
According to embodiments of the invention, the AVC controller at first obtains the voltage data that wind-powered electricity generation is sent circuit.The voltage data that wind-powered electricity generation is sent circuit has reflected the virtual voltage that PCC is ordered.Subsequently, wind-powered electricity generation is sent the voltage of circuit with the AVC controller and the target voltage of wind energy turbine set compares, and determines that according to voltage difference the needs wind energy turbine set sends the total value of reactive power or absorbing reactive power.Thereafter, the AVC controller can compile the voltage data of circuit and current data according to wind-powered electricity generation and determine that every wind-powered electricity generation compiles the total value of the reactive power that circuit can send or absorb, and determines the reactive power that corresponding blower fan can send or absorb according to voltage data and current data that the blower fan master control system provides.At last, the AVC controller sends to corresponding blower fan master control system with the control signal corresponding with the reactive power that every Fans need to send or absorb.Like this, the blower fan master control system just can be controlled current transformer in the corresponding blower fan according to control signal, so that have angle between the electric current of corresponding blower fan port and the voltage, thus corresponding blower fan can send reactive power or absorbing reactive power.Finally, send reactive power or absorbing reactive power by making blower fan, can improve or reduce the virtual voltage that PCC is ordered, thus the stability that assurance is incorporated into the power networks.
Selectively, when each blower fan sends or the reactive power that absorbs is not enough to that PCC is ordered virtual voltage improves or is reduced to desired value, the AVC controller can be controlled SVC and put into operation to send or absorbing reactive power, thereby further improves or reduce the voltage that PCC is ordered.
Fig. 3 is the flow chart that improves the method for the transient stability that is incorporated into the power networks in wind energy turbine set AVC system that illustrates according to the embodiment of the invention.
With reference to Fig. 3, determine at operation 301, AVC controller whether the PCC point voltage reduces suddenly.The AVC controller can determine whether the PCC point voltage reduces suddenly according to the voltage data that wind-powered electricity generation sends the voltage transformer on the circuit and provide is provided.Yet selectively, the AVC controller also can determine whether the PCC point voltage reduces suddenly according to the voltage data that the voltage transformer that is arranged on high voltage bus or the low-voltage bus bar provides.Specifically, when PCC point voltage decline rate of change is high, and the PCC point voltage drops to first threshold when following, and the AVC controller can determine that the PCC point voltage reduces suddenly.For example, when PCC point voltage decline rate of change is higher than 0.7 times of rated voltage/second, and the PCC point voltage is when being lower than 0.8 times of rated voltage, and the AVC controller can determine that the PCC point voltage reduces suddenly.Yet, the invention is not restricted to this, voltage drop rate of change and first threshold can be arranged arbitrarily by those skilled in the art according to actual needs.
When the AVC controller determines that the PCC point voltage reduces suddenly, waiting for the control of the scheduled time (such as, but not limited to, 20 milliseconds) afterwards locking wind energy turbine set AVC system to wind energy turbine set at operation 302, AVC controller.That is to say, the AVC controller abandons blower fan in the wind energy turbine set is sent the control of reactive power or absorbing reactive power.Like this, the AVC system can be engaged in the low-voltage crossing that occurs in the blower fan in the wind energy turbine set.
Subsequently, in operation 303, if the voltage data that the AVC controller provides based on the voltage transformer summation current transformer that is arranged on the SVC circuit and circuit data are determined SVC just when absorbing reactive power, then the AVC controller sends control command so that SVC stops absorbing reactive power.On the other hand, sending when idle if the AVC controller is determined SVC, the AVC controller does not carry out any control to SVC.
In determining scheduled time (such as, but not limited to, 5 seconds) after whether the PCC point voltage is occuring to reduce suddenly, operation 304, AVC controller rises on the Second Threshold (for example, greater than 0.9 times of rated voltage).When the AVC controller determines that the PCC point voltage rises on the Second Threshold in the given time, recover wind energy turbine set AVC system to the control of wind energy turbine set at operation 305, AVC controller.That is to say, the control of reactive power or absorbing reactive power is sent in the opening of AVC controller to blower fan in the wind energy turbine set, sends reactive power or absorbing reactive power thereby control corresponding blower fan according to the ruuning situation of wind energy turbine set.
On the other hand, when the AVC controller determines that the PCC point voltage does not rise on the Second Threshold in the given time, in operation 306, the AVC controller (is for example being waited for the scheduled time, but be not limited to 8-10 second) afterwards, the AVC controller recovers the control to wind energy turbine set.Here, the described scheduled time from the moment that the PCC point voltage occurs to reduce suddenly begins to calculate.
Fig. 4 illustrates the flow chart that improves according to another embodiment of the present invention the method for the transient stability that is incorporated into the power networks in wind energy turbine set AVC system.
With reference to Fig. 4, determine at operation 401, AVC controller whether the PCC point voltage rises suddenly.The AVC controller can determine whether the PCC point voltage rises suddenly according to the voltage data that wind-powered electricity generation sends the voltage transformer on the circuit and provide is provided.Yet selectively, the AVC controller also can determine whether the PCC point voltage rises suddenly according to the voltage data that the voltage transformer that is arranged on high voltage bus or the low-voltage bus bar provides.Specifically, when PCC point voltage rising rate of change is high, and the PCC point voltage rises to the 3rd threshold value when above, and the AVC controller can determine that the PCC point voltage rises suddenly.For example, when PCC point voltage rising rate of change is higher than 0.5 times of rated voltage/second, and the PCC point voltage is when being higher than 1.1 times of rated voltages, and the AVC controller can determine that the PCC point voltage rises suddenly.Yet, the invention is not restricted to this, voltage rising rate of change and the 3rd threshold value can be arranged arbitrarily by those skilled in the art according to actual needs.
When the AVC controller determines that the PCC point voltage rises suddenly, (for example waiting for for first scheduled time at operation 402, AVC controller, but be not limited to, 20 milliseconds) afterwards, the AVC controller is given an order to each blower fan master control system, reduces the reactive power that each blower fan sends.Specifically, the AVC controller can be given an order, and makes all blower fans no longer send reactive power.After this, in operation 403, if when the voltage data that the AVC controller provides based on the voltage transformer summation current transformer that is arranged on the SVC circuit and circuit data determined that SVC is sending reactive power, then the AVC controller sent control command so that SVC stops to send reactive power.Next, waiting for second scheduled time (such as, but not limited to 5 seconds) afterwards at operation 404, AVC controller, the AVC controller recovers wind energy turbine set AVC system to the control of the reactive power of wind energy turbine set.That is to say, the recovery of AVC controller is sent reactive power or absorbing reactive power to the control that blower fan in the wind energy turbine set sends reactive power or absorbing reactive power thereby control corresponding blower fan according to the ruuning situation of wind energy turbine set.Here, second scheduled time from the moment that the PCC point voltage occurs to rise suddenly begins to calculate.
The above method that when the PCC point voltage reduces suddenly or raises suddenly, keeps wind farm grid-connected transient stability of having described with reference to Fig. 3 and Fig. 4.Yet according to embodiments of the invention, the method for Fig. 4 can be carried out after the operation 301 of Fig. 3.For example, when the AVC controller determines that the PCC point voltage does not reduce suddenly, but executable operations 401 and subsequent operation.On the other hand, the method for Fig. 3 can be carried out after the operation 401 of Fig. 4.For example, when the AVC controller determines that the PCC point voltage does not rise suddenly, but executable operations 301 and subsequent operation.On the other hand, the AVC controller is executable operations 301 and 401 ( executable operations 301 and 401 sequencing are unrestricted) repeatedly, reduces suddenly or raises suddenly until detect the PCC point voltage, then executable operations 302 to 306 or operate 402 to 404.
According to embodiments of the invention, by synchronous detection short trouble and temporary latch, so that wind energy turbine set AVC system has taken into account the characteristics of blower fan low-voltage crossing function, the suddenly trend of reduction of point voltage has suppressed again to be incorporated into the power networks; By in the high voltage situation with the cooperating of SVC, the trend that the point voltage that suppressed to be incorporated into the power networks raises has suddenly absorbed excessive reactive power in the regional power grid; By with the cooperation of SVC, increased the total reactive power quick adjustment scope of wind energy turbine set, increased the transient stability of wind energy turbine set access Grid; The fluctuation of voltage has improved the fan operation environment during by the inhibition fault, has reduced the generation of large tracts of land off-grid event or chain reaction.
Although shown and described some embodiment, it should be appreciated by those skilled in the art that without departing from the principles and spirit of the present invention, can make amendment to these embodiment, scope of the present invention is limited by claim and equivalent thereof.
Claims (16)
1. a wind energy turbine set voltage is controlled the method that improves the transient stability that is incorporated into the power networks in (AVC) system automatically, described wind energy turbine set Voltage Automatic Control System comprises the AVC controller, be arranged on a plurality of blower fan master control systems on a plurality of blower fans in the wind energy turbine set, Static VAR Compensation SVC, be arranged on wind-powered electricity generation and send circuit, wind-powered electricity generation compiles circuit, the SVC circuit, a plurality of voltage transformer summation current transformers on high voltage bus and the low-voltage bus bar, wherein, every wind-powered electricity generation compiles connection a plurality of blower fans, the AVC controller is communicated by letter with each blower fan master control system by fiber optic network, and be electrically connected to described a plurality of voltage transformer summation current transformer, said method comprising the steps of:
(A) the AVC controller determines whether wind farm grid-connected PCC point voltage reduces suddenly;
(B) when the AVC controller determines that the PCC point voltage reduces suddenly, the AVC controller after waiting for for first scheduled time locking wind energy turbine set AVC system to the control of wind energy turbine set;
(C) when the AVC controller was determined SVC just at absorbing reactive power, the AVC controller sends control command so that SVC stops absorbing reactive power;
(D) the AVC controller determines that whether the PCC point voltage rises on the certain threshold level in second scheduled time after occuring to reduce suddenly;
(E) when the AVC controller determines that the PCC point voltage rises on the described certain threshold level within second scheduled time, the AVC controller recovers wind energy turbine set AVC system to the control of wind energy turbine set.
2. method according to claim 1, further comprising the steps of:
(F) when the AVC controller determines that the PCC point voltage does not rise on the described certain threshold level within second scheduled time, the AVC controller recovers wind energy turbine set AVC system to the control of wind energy turbine set after waiting for for the 3rd scheduled time.
3. method according to claim 2, wherein, the 3rd scheduled time from the moment that the PCC point voltage occurs to reduce suddenly begins to calculate.
4. method according to claim 1, wherein, whether suddenly the AVC controller determines the reduction of PCC point voltage according to the voltage data that wind-powered electricity generation sends the voltage transformer on the circuit and provide is provided.
5. method according to claim 1, wherein, when PCC point voltage decline rate of change is high, and the PCC point voltage drops to first threshold when following, and the AVC controller determines that the PCC point voltage reduces suddenly.
6. method according to claim 5, wherein, when PCC point voltage decline rate of change is higher than 0.7 times of rated voltage/second, and the PCC point voltage is when being lower than 0.8 times of rated voltage, and the AVC controller determines that the PCC point voltage reduces suddenly.
7. method according to claim 1, wherein, first scheduled time was 20 milliseconds, and second scheduled time was 5 seconds, and described certain threshold level is 0.9 times of rated voltage.
8. method according to claim 2, wherein, the 3rd scheduled time was 8-10 second.
9. method according to claim 1, wherein, the AVC controller determines that based on voltage data and circuit data that the voltage transformer summation current transformer that is arranged on the SVC circuit provides SVC just still sends reactive power at absorbing reactive power.
10. a wind energy turbine set voltage is controlled the method that improves the transient stability that is incorporated into the power networks in the AVC system automatically, described wind energy turbine set Voltage Automatic Control System comprises the AVC controller, be arranged on a plurality of blower fan master control systems on a plurality of blower fans in the wind energy turbine set, Static VAR Compensation SVC, be arranged on wind-powered electricity generation and send circuit, wind-powered electricity generation compiles circuit, the SVC circuit, a plurality of voltage transformer summation current transformers on high voltage bus and the low-voltage bus bar, wherein, every wind-powered electricity generation compiles connection a plurality of blower fans, the AVC controller is communicated by letter with each blower fan master control system by fiber optic network, and be electrically connected to described a plurality of voltage transformer summation current transformer, said method comprising the steps of:
(A) the AVC controller determines whether wind farm grid-connected PCC point voltage rises suddenly;
(B) when the AVC controller determines that the PCC point voltage rises suddenly, the AVC controller is given an order to each blower fan master control system, so that each blower fan stops to send reactive power after waiting for for first scheduled time;
(C) when the AVC controller determined to send reactive power such as SVC, the AVC controller sends control command so that SVC stops to send reactive power;
(D) the AVC controller is after waiting for for second scheduled time, and the AVC controller recovers wind energy turbine set AVC system to the control of the reactive power of wind energy turbine set.
11. method as claimed in claim 10, wherein, second scheduled time from the moment that the PCC point voltage occurs to rise suddenly begins to calculate.
12. method according to claim 10, wherein, whether suddenly the AVC controller is sent voltage data that the voltage transformer on the circuit provides or is determined the rising of PCC point voltage according to the voltage data that the voltage transformer that is arranged on the low-voltage bus bar provides according to being arranged on wind-powered electricity generation.
13. method according to claim 10, wherein, when PCC point voltage rising rate of change is high, and the PCC point voltage rises to described first threshold when above, and the AVC controller determines that the PCC point voltage rises suddenly.
14. method according to claim 13, wherein, when PCC point voltage rising rate of change is higher than 0.5 times of rated voltage/second, and the PCC point voltage is when being higher than 1.1 times of rated voltages, and the AVC controller determines that the PCC point voltage rises suddenly.
15. method according to claim 10, wherein, first scheduled time was 20 milliseconds, and first threshold is 1.1 times of rated voltages, and second scheduled time was 5 seconds.
16. method according to claim 10, wherein, the AVC controller determines that based on voltage data and circuit data that the voltage transformer summation current transformer that is arranged on the SVC circuit provides SVC just still sends reactive power at absorbing reactive power.
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Effective date of registration: 20160121 Address after: 100176 Beijing economic and Technological Development Zone, Beijing, Kangding street, No. 19, No. Patentee after: Beijing Goldwind Science & Creation Windpower Equipment Co., Ltd Patentee after: State Grid Xinyuan Zhangjiakou Scenery Storage Demonstration Power Plant Co., Ltd. Address before: 100176 Beijing economic and Technological Development Zone, Beijing, Kangding street, No. 19, No. Patentee before: Beijing Goldwind Science & Creation Windpower Equipment Co., Ltd |