CN105633941B - A kind of commutation failure suppressing method based on virtual current limiter - Google Patents
A kind of commutation failure suppressing method based on virtual current limiter Download PDFInfo
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- CN105633941B CN105633941B CN201510027123.9A CN201510027123A CN105633941B CN 105633941 B CN105633941 B CN 105633941B CN 201510027123 A CN201510027123 A CN 201510027123A CN 105633941 B CN105633941 B CN 105633941B
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Abstract
The invention belongs to electric system technical field of electric power transmission, a kind of commutation failure suppressing method based on virtual current limiter specifically disclosed.The virtual current limiter equivalent series when the DC current increase on transmission line of electricity, by the control of virtual current limiter, adjust rapidly current-order, achieve the purpose that to suppress DC current increase in Traditional DC transmission line of electricity.The present invention is applied in conventional high-tension direct current transportation, using virtual current limiter, the device such as direct current overcurrent amplitude, protection smoothing reactor, thyristor is limited in system jam, reduces the probability that commutation failure occurs for Traditional DC transmission system.
Description
Technical field
The invention belongs to transmission ＆ distribution electro-technical field, and in particular to a kind of commutation failure based on virtual current limiter suppresses
Method.
Background technology
Since the 1950s, traditional line commutation D.C. high voltage transmission（Line-Commutated-Converter
High Voltage Direct Current, LCC-HVDC）It is quickly controllable etc. with its large capacity long distance power transmission, active power
Feature has worldwide obtained quick development.
But due to LCC-HVDC using the triode thyristor of no self-switching-off capability as commutation components, LCC-
HVDC systems need the AC system of some strength to realize commutation, it is necessary to which AC network provides commutation voltage.When power grid occurs
When failure or asymmetric severe three-phase, ac bus voltage can be caused to decline, line voltage zero crossing may shift to an earlier date, LCC-HVDC valves
The commutation overlap angle of arm will increase, and shut-off angle will reduce, and be easy to cause commutation failure.After commutation between two bridge arms,
The valve of conducting is just exited within a period of time that backward voltage acts on, failing to recover blocking ability, or in backward voltage
Period commutation process fails to be finished always, and both of these case all will be to original by the valve of commutation when threshold voltage is changed into forward direction
Phase is switched to make a reservation for exit the valve of conducting, this is known as commutation failure.When commutation failure occurs, inverter side DC side occurs short in short-term
Road failure, inverter side DC voltage reduces, and rectification side DC voltage is of a relatively high, this make it that the DC current of DC line is fast
The equipment such as speed increase, DC line, thyristor will bear over-current shock, influence service life of equipment.Further, since AC line
The DC current on road is larger, and inverter side can continue that commutation failure occurs, and seriously limit straight-flow system transimission power, be whole
Cross-straight-intersection system brings huge disturbance.
In the prior art, VDCOL controls are by measuring AC line voltage value, adjustment DC current instruction.In some events
In the case of barrier, when finding that DC voltage is less than a certain value, the automatic setting valve for reducing DC current regulator, treats DC voltage
After recovery, and recover setting valve automatically.VDCOL can be conducive to AC system voltage to avoid inverter side long-time commutation failure
Recovery, improve failure after straight-flow system recovery characteristics.
However, when commutation failure occurs for inverter side, inverter side DC voltage substantially reduces, and rectification side DC voltage also comes
Not as good as change.When DC current rises to bigger numerical, under the action of the constant DC current control of rectification side, rectification side
DC voltage is just begun to decline, and further, the DC current instruction of VDCOL outputs can just decline.Therefore, current VDCOL controls
There is hysteresis in the limitation for making DC current amplitude during for inverter side commutation failure, be also unfavorable for defending inverter side that continuity occurs
Commutation failure.
The content of the invention
In order to overcome the above-mentioned deficiencies of the prior art, the present invention proposes a kind of commutation based on virtual current limiter and loses
Suppressing method is lost, in the virtual reactor of equivalent series on DC power transmission line, system normal operation and people can be made in order to control
System is in the operation of the state of decompression, pressure drop Δ that DC current produces on virtual reactance current limiterU *Do not interfere with VDCOL's
Normal control, the amplitude of DC current is limited in system jam, reduces the overcurrent of the equipment such as DC line, converter valve
Amplitude, reduces the probability that commutation failure occurs for inverter side to a certain extent.
The technical scheme is that a kind of commutation failure suppressing method based on DC current limiter, it improves it
Be in：The virtual current limiter equivalent series are on the transmission line of electricity that Traditional DC is transmitted electricity, its pressure drop produced effect
Current limiting low-voltage control VDCOL in DC transmission system, and gained DC voltage value is utilized, finally definite DC current refers to
Order.
Further, the mode for the transmission line of electricity that the virtual current limiter equivalent series are transmitted electricity in Traditional DC include with
Lower step：
I, the virtual inductor parameter equivalent for access of being connected is converted into control system, convert formula is：
（1）
In formula,LFor the virtual inductor parameter for access of being connected,I dNFor the specified electricity of the Traditional DC transmission system
Stream,U dNFor the rated voltage of the Traditional DC transmission system,L *For equivalent conversion to the virtual inductor value in control system.
II, by the DC current in control system to time derivation, and be multiplied by virtual inductor value, obtain DC current in void
Intend the pressure drop produced on demand limiter, its calculation formula is：
（2）
In formula,L *Converted to be equivalent to the virtual inductor value in control system,I d*It is equivalent convert into control system
DC current, ΔU *The pressure drop produced for DC current on virtual current limiter.
III, subtract DC current on virtual current limiter by the DC voltage value of original input VDCOL controls and produce
Pressure drop, obtain new DC voltage value, its calculation formula is：
（3）
In formula,U d*For the magnitude of voltage of original input VDCOL controls, ΔU *Produced for DC current on virtual current limiter
Raw pressure drop, is new DC voltage value.
Further, the input quantity that obtained new DC voltage value is controlled as VDCOL, and controlled according to VDCOL
Characteristic obtains DC current instruction.
Compared with prior art, beneficial effects of the present invention are as follows：
（1）The method of the present invention reduces inverter side and caused DC current amplitude after commutation failure occurs, and makes direct current
DC current impact suffered by the devices such as transmission line of electricity, smoothing reactor, thyristor reduces, and is conducive to the safety and stability fortune of equipment
OK, the service life of equipment is extended.
（2）The method of the present invention can reduce the probability that commutation failure occurs for DC transmission system to a certain extent, favorably
Recover rapidly from commutation failure in DC transmission system；
（3）The method of the present invention can be effectively reduced in multi-infeed HVDC system there is a situation where Secondary cases commutation failure,
Certain guarantee is provided for the safe and stable operation of Ac/dc Power Systems.
Brief description of the drawings
Fig. 1 is the control mode of virtual current limiter.
Embodiment
Below in conjunction with the attached drawing in the embodiment of the present application, the technical solution in the embodiment of the present application is carried out clear, complete
Site preparation describes.
As shown in Figure 1, Fig. 1 is the implementing procedure figure of the commutation failure suppressing method based on virtual current limiter；In figure,U d*For the magnitude of voltage of original input VDCOL controls, ΔU *The pressure drop produced for DC current on virtual current limiter, is new
DC voltage value,L *Converted to be equivalent to the virtual inductor value in control system,I d*It is equivalent convert into control system
DC current, is differential operator, the current-order exported for VDCOL under the effect of virtual current limiter.
The technical scheme is that a kind of commutation failure suppressing method based on DC current limiter, it improves it
Be in：The virtual current limiter equivalent series are on the transmission line of electricity that Traditional DC is transmitted electricity, its pressure drop produced effect
Current limiting low-voltage control VDCOL in DC transmission system, and gained DC voltage value is utilized, finally definite DC current refers to
Order.
The mode for the transmission line of electricity that the virtual current limiter equivalent series are transmitted electricity in Traditional DC comprises the following steps：
I, the virtual inductor parameter equivalent for access of being connected is converted into control system, convert formula is：
（1）
In formula,LFor the virtual inductor parameter for access of being connected,I dNFor the specified electricity of the Traditional DC transmission system
Stream,U dNFor the rated voltage of the Traditional DC transmission system,L *For equivalent conversion to the virtual inductor value in control system.
II, by the DC current in control system to time derivation, and be multiplied by virtual inductor value, obtain DC current in void
Intend the pressure drop produced on reactance current limiter, its calculation formula is：
（2）
In formula,L *Converted to be equivalent to the virtual inductor value in control system,I d*It is equivalent convert into control system
DC current, ΔU *The pressure drop produced for DC current on virtual reactance current limiter.
III, subtract DC current on virtual reactance current limiter by the DC voltage value of original input VDCOL controls and produce
Pressure drop, obtain new DC voltage value, its calculation formula is：
（3）
In formula,U d*For the magnitude of voltage of original input VDCOL controls, ΔU *Produced for DC current on virtual reactance current limiter
Raw pressure drop, is new DC voltage value.
The input quantity that obtained new DC voltage value is controlled as VDCOL, and obtained according to the VDCOL characteristics controlled
DC current instructs.
The foregoing is only a preferred embodiment of the present invention, but protection scope of the present invention be not limited thereto,
Any one skilled in the art the invention discloses technical scope in, the change or replacement that can readily occur in,
It should be covered by the protection scope of the present invention.Therefore, protection scope of the present invention should be with scope of the claims
Subject to.
Claims (3)
- A kind of 1. commutation failure suppressing method based on virtual current limiter, it is characterised in that the virtual current limiter For equivalent series on the transmission line of electricity that Traditional DC is transmitted electricity, its pressure drop produced acts on the current limiting low-voltage in DC transmission system VDCOL is controlled, and utilizes gained DC voltage value, finally definite DC current instruction, a kind of virtual current limiter Commutation failure suppressing method specifically include following steps：I, the virtual inductor parameter equivalent for access of being connected is converted into control system, convert formula is：(1)In formula,LFor the virtual inductor parameter for access of being connected,I dNFor the rated current of the Traditional DC transmission system,U dN For the rated voltage of the Traditional DC transmission system,L *For equivalent conversion to the virtual inductor value in control system；II, by the DC current in control system to time derivation, and be multiplied by virtual inductor value, obtain DC current in virtual electricity The pressure drop produced on stream limiter, its calculation formula are：(2)In formula,L *Converted to be equivalent to the virtual inductor value in control system,I d*For equivalent conversion to the direct current in control system Electric current, ΔU *The pressure drop produced for DC current on virtual current limiter；The DC voltage value of original input VDCOL controls, is subtracted the pressure that DC current produces on virtual current limiter by III Drop, obtains new DC voltage value, its calculation formula is：(3)In formula,U d*For the magnitude of voltage of original input VDCOL controls, ΔU *Produced for DC current on virtual current limiter Pressure drop,For new DC voltage value.
- A kind of 2. commutation failure suppressing method based on virtual current limiter according to claim 1, it is characterised in that The input quantity that obtained new DC voltage value is controlled as VDCOL, and DC current is obtained according to the VDCOL characteristics controlled Instruction.
- A kind of 3. commutation failure suppressing method based on virtual current limiter according to claim 1, it is characterised in that In the operation of the state of decompression, DC current only exists small ripple fluctuation, directly for system normal operation and artificial control system The pressure drop Δ that galvanic electricity stream produces on virtual current limiterU *The normal control of VDCOL is not interfered with；When failure causes When DC current quickly increases, pressure drop Δ that DC current produces on virtual current limiterU *Will be so that being input to VDCOL The new DC voltage value of controlReduce, and then VDCOL quickly reduces current-order, reaches limitation direct current overcurrent, suppression The purpose of continuation commutation failure processed.
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| CN106712070B (en) * | 2017-01-22 | 2023-11-07 | 全球能源互联网研究院有限公司 | Method and system for inhibiting commutation failure based on controllable resistor |
| CN106998075A (en) * | 2017-05-26 | 2017-08-01 | 云南电网有限责任公司电力科学研究院 | Suppress the method and system of the 12 pulsation follow-up commutation failures of inverter of IGCT |
| CN110768284B (en) * | 2019-11-01 | 2023-09-15 | 云南电网有限责任公司电力科学研究院 | Method for restraining direct current commutation failure based on VDCOL additional controller |
| CN112636379A (en) * | 2020-12-09 | 2021-04-09 | 国家电网有限公司 | Virtual control method and system for direct current |
| CN112928938B (en) * | 2021-03-25 | 2022-12-02 | 中国矿业大学 | Virtual reactance-based MMC direct current fault current limiting method |
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| 抑制多馈入直流输电系统后续换相失败措施研究;郭利娜等;《电力自动化设备》;20131130;第33卷(第11期);第95-99页 * |
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