CN103311946A - Constant arc-extinguishing area control method of direct-current power transmission control system - Google Patents
Constant arc-extinguishing area control method of direct-current power transmission control system Download PDFInfo
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- CN103311946A CN103311946A CN2013102289933A CN201310228993A CN103311946A CN 103311946 A CN103311946 A CN 103311946A CN 2013102289933 A CN2013102289933 A CN 2013102289933A CN 201310228993 A CN201310228993 A CN 201310228993A CN 103311946 A CN103311946 A CN 103311946A
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
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Abstract
The invention relates to a constant arc-extinguishing area control method of a direct-current power transmission control system. The method includes the following steps: 1), calculating a rated arc-extinguishing angle reference value of the system; 2), adopting a constant arc-extinguishing area algorithm to calculate current alternating-current voltage and an arc-extinguishing angle reference value corresponding to the rated arc-extinguishing angle reference value of the system; 3), calculating a triggering angle needed by a converter valve according to the arc-extinguishing angle reference angle to control the converter valve of an inverter station, wherein U refers to the minimum value in three-phase alternating-current voltage amplitude values on an inverter station converter net side, UN refers to a rated alternating-current voltage amplitude value on the inverter station converter net side, gamma refN refers to the rated arc-extinguishing angle reference value, and gamma ref refers to the arc-extinguishing angle reference value. By applying the method, when alternating-current voltage decreases caused by the fact that the inverter station is in alternating-current fault, the actual arc-extinguishing angle can be increased according to actual conditions, probability of phase commutation failure can be lowered, and stability of the system can be improved.
Description
Technical field
The present invention relates to a kind of DC power transmission control system and decide blow-out area control method.
Background technology
Domestic high voltage direct current transmission project and extra-high voltage direct-current transmission engineering all is the two ends direct current system at present.Sending end becomes direct current with alternating current, is called converting plant; Receiving end becomes alternating current with direct current, is called Inverter Station.Energy is transferred to Inverter Station by converting plant.High voltage direct current transmission project and extra-high voltage direct-current transmission engineering all are to adopt thyristor as the converter element.Thyristor is half control type device, the conducting by triggering gate pole under forward voltage drop; Making the electric current that flows through thyristor be lower than the threshold electric current by the external circuit effect turn-offs.Converting plant is identical with the topological structure of Inverter Station converter, all is 12 pulse wave converters, and the Trigger Angle scope is 0 °～90 ° during the rectification operation, and the Trigger Angle scope is 90 °～180 ° during inverter operation.Because during the thyristor commutation, there is the commutation overlap angle in the effect of commutating reactance.
The control system of converting plant and Inverter Station has generally all configured direct current controller, dc voltage controller and gamma kick device.During steady operation, the direct current controller action of converting plant by regulating Trigger Angle, makes direct current be stabilized in direct current reference value level; Dc voltage controller provides constraints, and prevents that direct voltage is too high.Inverter Station then relies on the effect of gamma kick device, calculates current required Trigger Angle by the predicting arc extinguishing angle algorithm, makes the extinguish angle of Inverter Station stable.The direct current controller of Inverter Station and dc voltage controller are spare controller.
Analyze the commutation voltage waveform and know, Trigger Angle is during greater than 90 °, and commutation voltage successively decreases, and therefore when alternating voltage falls, the commutation overlap angle increases, and the reverse voltage that the thyristor that needs commutation to turn-off bears reduces, and the minimizing of back-pressure duration easily causes commutation failure.The prediction type extinguish angle controller algorithm calculates according to extinguish angle reference value, Inverter Station alternating voltage and direct current and satisfies the required Trigger Angle of this extinguish angle reference value.Controller need to be finished a secondary program execution cycle just can refresh Trigger Angle, and therefore the Trigger Angle of current output is corresponding to alternating voltage and the direct current of a upper periodic sampling.When the Inverter Station alternating voltage continues to reduce, because the extinguish angle reference value is constant, during the trigger angle control thyristor commutation of prediction type extinguish angle controller output, the thyristor real extinction angle will reduce gradually.Alternating voltage falls when serious, will cause commutation failure.
Summary of the invention
The purpose of this invention is to provide a kind of DC power transmission control system and decide blow-out area control method, cause the problem of converter valve commutation failure when solving Inverter Station AC network side generation disturbance lower voltage.
For achieving the above object, the solution of the present invention is: a kind of DC power transmission control system is decided blow-out area control method, and the method step is as follows:
1) the specified extinguish angle reference value of computing system;
2) the blow-out area algorithm is decided in employing
Calculate the corresponding extinguish angle reference value of the specified extinguish angle reference value of current alternating voltage and system, wherein U is that the Inverter Station change of current becomes the minimum value in the net side three-phase alternating voltage amplitude, U
NFor the Inverter Station change of current becomes the specified alternating voltage amplitude of net side, γ
RefNBe specified extinguish angle reference value, γ
RefBe the extinguish angle reference value;
3) calculate the required trigger angle control Inverter Station converter valve of converter valve according to the extinguish angle reference value.
The specified extinguish angle reference value of the system of this gamma kick method is calculated according to alternating voltage, alternating current and reactive power exchange demand.
When system disturbance occurs and causes the AC voltage drop, γ
RefIncrease, decide the gamma kick mode with forecasting type and compare, after the extinguish angle reference value increases, Trigger Angle will reduce, and real extinction angle will increase, and be conducive to suppress the generation of commutation failure; When alternating voltage is rated value when system stable operation, γ
Ref=γ
RefN, Inverter Station will be decided the gamma kick strategy according to forecasting type and is operated in and decide the extinguish angle running status, and direct voltage and direct current are the positive slope characteristic.Adopt among the present invention and decide blow-out area control method, when Inverter Station causes alternating voltage to reduce owing to the generation AC fault, can increase real extinction angle according to actual conditions, reduce the probability of commutation failure, increase Systems balanth.
Description of drawings
Fig. 1 is theory diagram of the present invention;
Fig. 2 is method flow diagram of the present invention.
Embodiment
The present invention will be further described in detail below in conjunction with accompanying drawing.
U among Fig. 1
Ac, I
d, I
AcBe respectively AC voltage, DC side electric current, ac-side current.
U among Fig. 2
a, U
b, U
cFor the Inverter Station change of current becomes net side three-phase alternating voltage, U is the minimum value of three-phase alternating voltage, U
NFor the Inverter Station change of current becomes the specified alternating voltage amplitude of net side, γ
RefNBe specified extinguish angle reference value, γ
RefBe the extinguish angle reference value, α is Trigger Angle.
In order to distinguish with existing prediction type extinguish angle control method, the blow-out area control method of deciding of called after extinguish angle of the present invention, blow-out area refer to commutation voltage commutation finish time (extinguish angle is constantly corresponding) to the integral domain area between the zero crossing (commutation voltage is negative by just becoming).Idle control module calculates current system extinguish angle reference value.Blow-out area reference value is the integration of specified commutation voltage between system's extinguish angle reference value and zero crossing.Decide blow-out area control module according to blow-out constant area principle (the corresponding blow-out area of extinguish angle that namely triggers constantly prediction equals blow-out area reference value), use and decide the blow-out area algorithm
Calculate the corresponding extinguish angle reference value of the current alternating voltage amplitude of Inverter Station.
Theory diagram of the present invention as shown in Figure 1, this control method is specially: reactive controller gathers the ac bus electric current and the change of current becomes net top-cross stream voltage, calculate current extinguish angle demand, the specified extinguish angle reference value of output system according to the reactive balance control strategy.Decide the blow-out area controller and calculate extinguish angle reference value corresponding to current alternating voltage according to current change of current change net top-cross stream voltage and the specified extinguish angle reference value of system.Decide direct current and change of current change net top-cross stream voltage that the gamma kick device gathers DC line, calculate and satisfy the required Trigger Angle of valve extinguish angle reference value.Trigger Angle is delivered to the pulse-triggered unit, controls the operation of 12 pulse wave converters.
Implementation method of the present invention as shown in Figure 2.Specified extinguish angle reference value is provided by idle control module.Gather the change of current and become net side three-phase alternating voltage, calculate the amplitude of single-phase voltage, get minimum amplitude and be used for deciding the blow-out area algorithm.Calculate the corresponding extinguish angle reference value of current alternating voltage according to deciding the blow-out area algorithm.Decide the gamma kick algorithm and calculate the required Trigger Angle of converter according to the extinguish angle reference value.During steady operation, the extinguish angle reference value equals the specified extinguish angle reference value of system, and Inverter Station will be operated in according to Classical forecast type gamma kick strategy decides the extinguish angle running status; During the disturbance of Inverter Station alternating voltage, decide blow-out area control strategy owing to adopting, increased the extinguish angle reference value, reduced Trigger Angle, improve the ability of Inverter Station prevention commutation failure.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., all should be included within the claim scope of the present invention.
Claims (2)
1. a DC power transmission control system is decided blow-out area control method, it is characterized in that, method step is as follows:
1) the specified extinguish angle reference value of computing system;
2) the blow-out area algorithm is decided in employing
Calculate the corresponding extinguish angle reference value of the specified extinguish angle reference value of current alternating voltage and system, wherein U is that the Inverter Station change of current becomes the minimum value in the net side three-phase alternating voltage amplitude, U
NFor the Inverter Station change of current becomes the specified alternating voltage amplitude of net side, γ
RefNBe specified extinguish angle reference value, γ
RefBe the extinguish angle reference value;
3) calculate the required trigger angle control Inverter Station converter valve of converter valve according to the extinguish angle reference value.
2. a kind of DC power transmission control system according to claim 1 is decided blow-out area control method, it is characterized in that, the specified extinguish angle reference value of described system is calculated according to alternating voltage, alternating current and reactive power exchange demand.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310228993.3A CN103311946B (en) | 2013-06-08 | 2013-06-08 | Constant arc-extinguishing area control method of direct-current power transmission control system |
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| CN201310228993.3A CN103311946B (en) | 2013-06-08 | 2013-06-08 | Constant arc-extinguishing area control method of direct-current power transmission control system |
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| CN103311946A true CN103311946A (en) | 2013-09-18 |
| CN103311946B CN103311946B (en) | 2015-01-21 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103545835A (en) * | 2013-09-22 | 2014-01-29 | 国家电网公司 | Direct-current power system commutation failure judgment method |
| CN103543357A (en) * | 2013-10-23 | 2014-01-29 | 华北电力大学 | Method for prejudging phase change failure of converter valve |
| CN104466984A (en) * | 2014-12-12 | 2015-03-25 | 国家电网公司 | Dynamic reactive standby optimization method for increasing safety level of direct current commutation |
| CN105162154A (en) * | 2014-12-22 | 2015-12-16 | 中国南方电网有限责任公司 | Method for increasing an extinction angle value according to an area value to avoid a DC commutation failure |
| CN109066764A (en) * | 2018-09-26 | 2018-12-21 | 云南电网有限责任公司电力科学研究院 | The optimized calculation method and device at a kind of Inverter Station actual measurement blow-out angle |
| CN110707739A (en) * | 2019-09-30 | 2020-01-17 | 南方电网科学研究院有限责任公司 | High-voltage direct-current transmission trigger pulse control method and device |
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| CN1881772A (en) * | 2005-06-16 | 2006-12-20 | 许继集团有限公司 | Method for controlling prediction type extinguish angle in DC power transmission system |
| CN101359875A (en) * | 2008-09-18 | 2009-02-04 | 国网电力科学研究院 | Multiple freedom degree dynamic control method for inverse transform bridge phase shifting advance angle of stationary frequency conversion starter |
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2013
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Patent Citations (4)
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| JP2000175452A (en) * | 1998-12-02 | 2000-06-23 | Toshiba Corp | Controller and control method for power converter |
| EP1069666A1 (en) * | 1999-07-01 | 2001-01-17 | Abb Ab | Control of active power in a high voltage direct current transmission system |
| CN1881772A (en) * | 2005-06-16 | 2006-12-20 | 许继集团有限公司 | Method for controlling prediction type extinguish angle in DC power transmission system |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103545835A (en) * | 2013-09-22 | 2014-01-29 | 国家电网公司 | Direct-current power system commutation failure judgment method |
| CN103545835B (en) * | 2013-09-22 | 2015-06-03 | 国家电网公司 | Direct-current power system commutation failure judgment method |
| CN103543357A (en) * | 2013-10-23 | 2014-01-29 | 华北电力大学 | Method for prejudging phase change failure of converter valve |
| CN103543357B (en) * | 2013-10-23 | 2015-12-02 | 华北电力大学 | A kind of pre-judging method of converter valve commutation failure |
| CN104466984A (en) * | 2014-12-12 | 2015-03-25 | 国家电网公司 | Dynamic reactive standby optimization method for increasing safety level of direct current commutation |
| CN105162154A (en) * | 2014-12-22 | 2015-12-16 | 中国南方电网有限责任公司 | Method for increasing an extinction angle value according to an area value to avoid a DC commutation failure |
| CN105162154B (en) * | 2014-12-22 | 2017-10-31 | 中国南方电网有限责任公司 | The method that direct-current commutation failure sets increase blow-out angle numerical value according to area figures |
| CN109066764A (en) * | 2018-09-26 | 2018-12-21 | 云南电网有限责任公司电力科学研究院 | The optimized calculation method and device at a kind of Inverter Station actual measurement blow-out angle |
| CN109066764B (en) * | 2018-09-26 | 2021-06-25 | 云南电网有限责任公司电力科学研究院 | Optimal calculation method and device for actually measured arc-quenching angle of inverter station |
| CN110707739A (en) * | 2019-09-30 | 2020-01-17 | 南方电网科学研究院有限责任公司 | High-voltage direct-current transmission trigger pulse control method and device |
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Inventor after: Li Shaohua Inventor after: Peng Zhong Inventor after: Li Tai Inventor after: Jing Xueji Inventor after: Su Yun Inventor after: Zhao Jing Inventor after: Wu Gang Inventor after: Jiao Po Inventor after: Wu Zhanwei Inventor before: Li Shaohua Inventor before: Peng Zhong Inventor before: Li Tai Inventor before: Jing Xueji Inventor before: Su Yun Inventor before: Zhao Jing |
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Free format text: CORRECT: INVENTOR; FROM: LI SHAOHUA PENG ZHONG LI TAI JING XUEJI SU YUN ZHAO JING TO: LI SHAOHUA PENG ZHONG LI TAI JING XUEJI SU YUN ZHAO JING WU GANG JIAO PO WU ZHANWEI |
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