CN103181070A - Voltage control in a direct current power system - Google Patents
Voltage control in a direct current power system Download PDFInfo
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- CN103181070A CN103181070A CN2010800698348A CN201080069834A CN103181070A CN 103181070 A CN103181070 A CN 103181070A CN 2010800698348 A CN2010800698348 A CN 2010800698348A CN 201080069834 A CN201080069834 A CN 201080069834A CN 103181070 A CN103181070 A CN 103181070A
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- 238000004590 computer program Methods 0.000 claims description 9
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/66—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal
- H02M7/68—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters
- H02M7/72—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/75—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means
- H02M7/757—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only
- H02M7/7575—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only for high voltage direct transmission link
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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
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
- H02M5/42—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
- H02M5/44—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac
- H02M5/443—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a thyratron or thyristor type requiring extinguishing means
- H02M5/45—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only
- H02M5/4505—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only having a rectifier with controlled elements
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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
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
- Rectifiers (AREA)
Abstract
A converter station (12) in a direct current power system (10) connected between an alternating current power line (30) and a direct current power line (14) comprises a transformer (18), a converter (20) equipped with converter valves of which at least a first set is connected to the transformer and a control unit (22) controlling the converter station for providing a DC voltage (VDC1) at one end of the direct current power line for contributing to the forming of a voltage difference together with another DC voltage (VDC2) generated by a further converter station (16) at an opposite end of the direct current power line for enabling a feeding of power over the direct current power line. The control unit controls the converter to provide a DC voltage through using firing angle control of the converter valves connected to the transformer.
Description
Technical field
The present invention relates generally to transmission system.More particularly, the present invention relates in direct current power system current conversion station, be used for controlling the method and computer program product of the dc voltage that this current conversion station and this system provide.
Background technology
Then especially in high voltage direct current (HVDC) transmission system, the voltage that is used for transmission of electricity becomes more and more higher in electric power system (such as transmission system).Nowadays, use in many cases 800 kV.But, contemplate even higher grade in the future, such as 1000 kV and even 1200 kV.Here, the converter in current conversion station is typically changed between high AC voltage and such high dc voltage.
Use so high-grade meeting to cause various types of problems.The problem of a particular category is insulation.May need to take special measure, in order to guarantee that the insulation that can process desired electric pressure is arranged, this makes equipment huger and more expensive.
An affected special equipment in current conversion station is transformer.Transformer comprises winding and secondary winding, and wherein, one in these windings is the winding that exchanges (AC) power transmission line for engaging, and another is for the winding that engages converter valve.Transformer also comprises be used to the adjusting winding that is controlled at the voltage that valve winding place provides.Then regulate winding and be connected to tap changer, to allow to carry out this control.Thereby the non-loaded dc voltage that usually changes by the tap changer that is connected to the converter transformer is regulated converter.Thereby regulate winding and control dc voltage for the conversion between AC and DC.
All these windings all must have insulation, and this voltage levels place that will mention in the above causes transformer very huge, may be difficult to transport such transformer.Can exist in addition at the transformer dimension constraint that can't satisfy aspect such transportation.
A kind of mode that reduces size is to remove the adjusting winding.But, if so do, just can't use the aforesaid way of controlling dc voltage.
Control the needs of the different modes of dc voltage when therefore existing conversion between AC and DC.
Delay angle was used in the past the control of converter, but was not for provide dc voltage on the DC power transmission line.Some examples have been provided in GB 2295506, US 4648018, US 2009/0219737, US 7499291 and US 3339083.
At Nick J. Murray, Jos Arrillaga, " the Flexible Reactive Power Control in Multigroup Current-Sourced HVDC Interconnections " that Yong He Liu and Neville R. Watson show, IEEE Transactions On Power Delivery. Vol.23, No.4, in October, 2008, another example is described in the 2160-2167 page., use inverter in the DC system and the trigger angle control of rectifier here, in order to when reactive power is injected in the AC system, keep the DC power of regulation to transmit.
Summary of the invention
A target of the present invention is to provide a kind of current conversion station that uses the alternate ways of the dc voltage of controlling power transmission line.
According to a first aspect of the invention, realize this target by the current conversion station in direct current power system, this current conversion station is connected between AC power line and DC transmission line, and current conversion station comprises:
Transformer,
Be equipped with the converter of converter valve, at least the first group converter valve is connected to transformer, and
Control unit, it is configured to control current conversion station, provides dc voltage with the end place in DC transmission line, locate another dc voltage of generation in the opposite end of DC transmission line with another current conversion station together, facilitate the formation of voltage difference, make it possible to feed power on DC transmission line
Wherein, control unit is configured to control converter, provides dc voltage with the trigger angle control that is connected to the converter valve of transformer by use.
According to a second aspect of the invention, the method for the dc voltage that also provides by a kind of current conversion station for controlling direct current power system realizes this target, and current conversion station is connected between AC power line and DC transmission line, and comprises:
Transformer, and
Be equipped with the converter of converter valve, at least the first group converter valve is connected to transformer,
Said method comprising the steps of:
Control current conversion station, with by be operatively connected to the converter valve of transformer with trigger angle control, an end place at the DC power transmission line provides dc voltage, so that and another dc voltage that another current conversion station produces at the place, opposite end of DC transmission line together, facilitate the formation of voltage difference, make it possible to feed power on DC transmission line.
in addition, the computer program of the dc voltage that provides by a kind of current conversion station for controlling direct current power system is realized this target, current conversion station is connected between AC power line and DC transmission line, and comprise transformer and the converter that is equipped with converter valve, the at least the first group converter valve is connected to transformer, computer program comprises the computer readable device of load capacity calculation machine program code, program code is configured to: control current conversion station, with by be operatively connected to the converter valve of described transformer with trigger angle control, an end place at the DC power transmission line provides dc voltage, so that and another dc voltage that another current conversion station produces at the place, opposite end of DC transmission line together, facilitate the formation of voltage difference, make it possible to feed power on DC transmission line.
In addition, realize this target by a kind of direct current power system that is connected between the first AC power line and the second AC power line, direct current power system comprises:
The first current conversion station, the rectifier that it has the first transformer, the first control unit and is equipped with converter valve, at least the first group converter valve is connected to the first transformer,
The second current conversion station, the inverter that it has the second transformer, the second control unit and is equipped with converter valve, at least the first group converter valve is connected to the second transformer,
DC transmission line has the first end that is connected to the first current conversion station and is connected to the second end of the second current conversion station,
Wherein, the first control unit is configured to control the first current conversion station, provide the first dc voltage with the first end place in DC transmission line, and the second control unit is configured to control the second current conversion station, the second end place in DC transmission line provides the second dc voltage, to be provided at the voltage difference of feed power on DC transmission line
Wherein, the first control unit is configured to control rectifier, delay angle with the rectifier converter valve that is connected to the first transformer by use controls to provide the first dc voltage, and the second converter is configured to control inverter, provides the second dc voltage with the commutation boundary Control with the converter valve that is connected to the second transformer.
The present invention has many advantages.The present invention allows transformer to make littlely, and does not regulate winding,, lacks the adjusting winding that is, thus simplified design, but also make transformer be easy to transportation.
Description of drawings
With reference to accompanying drawing, will be described below the present invention, wherein
Fig. 1 is schematically illustrated according to the first embodiment of the present invention, transmission system that comprise the first current conversion station and the second current conversion station,
Fig. 2 illustrates according to the flow charts first embodiment of the present invention, many method steps that carry out in the first current conversion station,
Fig. 3 illustrates according to the flow charts first embodiment of the present invention, many method steps that carry out in the second current conversion station, and
Schematically illustrated the first current conversion station according to a second embodiment of the present invention of Fig. 4.
Embodiment
Will be below with respect to transmission system, then more particularly with respect to high voltage direct current (HVDC) transmission system, the direct current power system that comprises according to current conversion station of the present invention is described.But, will be appreciated that, the invention is not restricted to such system, but can be applicable to adopt the DC system of any type of converter valve, for example be applied to back-to-back formula DC system.
Schematically illustrated HVDC system 10 be used to being connected between two interchanges (AC) power transmission line 30 and 32 in Fig. 1.These power transmission lines 30 and 32 can be the part of AC transmission system separately.HVDC system 10 comprises the first substation or current conversion station 12 and the second substation or current conversion station 16, the first current conversion station 12 the first converter 20 of comprising the first transformer 18 and being used for changing between AC and DC wherein, wherein the first converter 20 in this example is rectifiers.Here, the first transformer 18 has the secondary survey of the AC side of once surveying and be connected to the first converter 20 that is connected to an AC power transmission line 30.The first converter 20 also has the DC side of the first end that is connected to DC power transmission line 14.Here also has the first control unit 22.This unit 22 is connected to an AC power transmission line 30, to obtain the AC measuring voltage V from power transmission line 30
M1, unit 22 is connected to the first end of DC power transmission line 14, in order to obtain a DC measuring voltage, and unit 22 is connected to the first converter 20, in order to control this converter.DC power transmission line 14 has the second end, and this second end is connected to the second current conversion station 16.The second current conversion station 16 is also changed between AC and DC, and in this example, the second current conversion station 16 is inverters.More particularly, the second end of DC power transmission line 14 is connected to the DC side of the second converter 26, and the second converter 26 also has the AC side of the secondary survey that is connected to the second transformer 24.The second transformer 24 also has once to be surveyed, and wherein, this is once surveyed and is connected to the 2nd AC power transmission line 32.At last, there is the load 34 that is connected to the 2nd AC power transmission line 32.
Therefore appreciablely be, the first current conversion station is connected between the first end of an AC power transmission line 30 and DC power transmission line 14, and the second current conversion station 16 is connected between the second end of the 2nd AC power transmission line 32 and DC power transmission line 14, and wherein, this second end is also the opposite end of DC power transmission line 14., also have control unit (the second control unit 28) here in the second current conversion station 16, this control unit is connected to the 2nd AC power transmission line 32, to obtain the 2nd AC measuring voltage V
M2, this control unit is connected to the second end of DC power transmission line 14, in order to obtain the 2nd DC measuring voltage, and this control unit is connected to the second converter 26, in order to control the second converter 26.
HVDC system 10 in Fig. 1 is monopolar DC systems.To with respect to this system, the present invention be described below.But, will be appreciated that, also can provide the present invention in bipolar DC system.In addition, the HVDC system can be more complicated, and comprise some more power transmission lines and current conversion station.
Converter 20 and 26 is line commutation type (line-commutated) current source converter (csc) (CSC) advantageously, but can imagine other type.
Fig. 2 illustrates according to the flow charts first embodiment of the present invention, many method steps that carried out by the first control unit in the first current conversion station, and Fig. 3 illustrates according to the flow charts first embodiment of the present invention, many method steps that carried out by the second control unit in the second current conversion station.
To with respect to coming through-put power on DC power transmission line 14 by controlling the first current conversion station and the second current conversion station, the first embodiment of the present invention be described now.
In illustration the first embodiment, the first converter 20 is rectifiers, and the second converter 26 is inverters, namely, the power that the first converter 20 receives from an AC power transmission line 30, and to the second converter 26, then power is fed to load 34 by the 2nd AC power transmission line 32 with this power delivery.Here the situation that it should be understood that can be opposite because the second converter 26 equally can be with power delivery to the first converter 20, thereby and the first converter 20 as invertor operation, the second converter 26 serves as rectifier.In addition, for transmission power, the first converter 20 will provide to the first end of DC power transmission line 14 the first dc voltage V
DC1, and the second converter 26 will provide to the second end of DC power transmission line 14 the second dc voltage V
DC2These two voltage V
DC1And V
DC2Facilitate the formation of voltage difference, thereby voltage difference is poor between the first dc voltage and the second dc voltage.If the first converter serves as rectifier, the first dc voltage V
DC1Higher than the second dc voltage V
DC1Thereby, with power delivery to the two DC power transmission lines 32, and finally be transported to load 34.If the second converter serves as rectifier, opposite the second dc voltage will be higher.
For the first dc voltage V is provided
DC1, the first control unit 22 is by controlling the converter valve of the first converter 20 with trigger angle control.More particularly carry out this point by lower person, that is, the first control unit 22 changes the triggered time of the converter valve of the first converter 20, in order to make the DC electric current of DC power transmission line 14 remain on desired grade (step 35) by changing the first dc voltage.Can complete this point by lower person, namely, obtain a DC measuring voltage at the first end place of DC power transmission line, and produce valve control signal based on the target voltage (it is the expectation electric pressure) of the first dc voltage and the difference between the first dc voltage of measuring.Feasiblely here be that branch produces control signal by in parallel with integral control branch (integrating control branch) proportional control.Then control signal is used for triggering the thyristor in converter valve., with the delay with respect to voltage over zero, trigger the thyristor of rectifier here, and therefore control is that delay angle is controlled.This can relate to increasing or reducing and postpone, in order to make the first dc voltage V
DC1Remain on desired grade.But, regulate the adjusting that also can be to the minimum delay.
In order to process this situation, the first control unit 22 obtains an AC measuring voltage V of an AC power transmission line 30
M1(step 36) wherein, obtains to measure by using traditional measurement unit (for example voltage transformer).Then compare an AC measuring voltage V
M1With the first reference voltage V
REF1(step 38).The first reference voltage is set here, and makes the situation of its expression when the first power transmission line has AC voltage corresponding to minimum trigger angle or minimum delay.If an AC measuring voltage is higher than reference value V
REF1(step 40), the first control unit 22 by using original object to change Trigger Angle (step 35), continues to control converter valve.But, if an AC measuring voltage V
M1Lower than the first reference voltage V
REF1(step 40), the triggering of the first control unit 22 immutable converter valve is because these trigger with minimum trigger angle.On the contrary, the first control unit 22 reduces the first dc voltage V
DC1(step 42).Can measure AC voltage V based on first
M1With the first reference voltage V
REF1Between relation carry out this reduction.Here feasible is that the relation of using is the ratio V of an AC measuring voltage and the first reference voltage
M1/ V
REF1Therefore this relates to the ratio V based on an AC measuring voltage and the first reference voltage
M1/ V
REF1Reduce target voltage.Here feasible is that the second control unit 28 will be born the responsibility of Current Control, in order to set up stable control point.In this case, the first control unit will continue to use minimum angles, until a DC measuring voltage is reduced under fresh target.When the grade of the first dc voltage had fully reduced, the first control unit 22 recovered to control, and continues and change the triggering of converter valve, in order to obtain the first dc voltage V
DC1(step 35).As alternative, feasible is, the first control unit 22 notifies the second control unit 28, the second control units 28 should be to reduce with the first control unit 22 target voltage that the identical amount of itself target reduces its use.In this case, the first control unit 22 keeps Current Control, and may increase or reduce Trigger Angle, in order to reduce or increase electric current.Thereby the phase angle still needs to have the control interval, and within this control interval, no matter whether it is at the minimum trigger angle place, it all is controlled.In the situation that minimum trigger angle is 10 degree, this interval can be between 5 degree and 15 degree.What should mention here is, in the situation that an AC measured value rises on the first reference voltage again, can recover normal control by using original object voltage.
According to the first embodiment of the present invention, also take identical method in the second current conversion station 16.Therefore, the second control unit 28 is by trigger angle control, and the triggering of more particularly passing through to change the inverter converter valve, controls the second converter 26, to obtain the second dc voltage V
DC2(step 44).Here, this is usually directed to increase or reduce Trigger Angle, so that the second dc voltage V
DC2Keep constant.Thereby by obtain the second dc voltage V with trigger angle control
DC2, also can complete this point by lower person here, that is, obtain the 2nd DC measuring voltage from the second end of DC power transmission line 14, relatively the 2nd DC measuring voltage and target voltage, and the control signal that is provided for triggering the thyristor in converter valve based on difference.Because the second converter 26 is inverters, so also be clear that the adjusting that the second control unit 28 is carried out the border of commutation here.But, should remain the border of minimum commutation.
Therefore the second control unit 26 acquisitions are from the 2nd AC measuring voltage V of the 2nd AC power transmission line 32
M2(step 46).Here also by obtaining these measurements with the traditional measurement unit.Then the second control unit 28 compares the 2nd AC measuring voltage V
M2With the second reference voltage V
REF2(step 48) is and if this measuring voltage V
M2Higher than the second reference voltage V
REF2(step 50), the second control unit 28 by changing Trigger Angle with original object, continues to control converter valve.
But, if the 2nd AC voltage V that measures
M2Lower than the second reference voltage V
REF2(step 50), the second control unit 28 is based on the 2nd AC measuring voltage V
M2With the second reference voltage V
REF2Between relation, that is, and with for the described identical mode of the first control unit, reduce the second dc voltage V
DC2(step 52).After the second dc voltage fully reduces, continue and change the border of commutating after the second control unit 28, to obtain and corresponding the second dc voltage (step 44) of fresh target.If the AC voltage of measuring rises on reference voltage, can reuse original object.
In this first embodiment of the present invention, control all converter valve of the first converter and the second converter in above-described mode, with by providing dc voltage with trigger angle control.During common trigger angle control, feasible is, at triggered as normal angle control period, each Trigger Angle can be in the scopes of 5 degree-75 degree.
Because by this way but not by controlling dc voltage with tap changer, thus the first transformer and the second transformer of winding not regulated can be provided, and therefore can use the transformer of less and small volume.In the time will using current conversion station under very high electric pressure (such as 1000 kV or 1200 kV), this is very important.Then transformer can have better simply design, thereby and is easy to produce.This also produces the transformer that is easy to transport, and is in the situation that other transportations may be difficult, perhaps sometimes even impossible.
By trigger angle control, it is feasible making the direct voltage of circuit keep constant.But, use trigger angle control will cause non-load voltage to increase, thus and the reactive power consumption of raising converter.This causes again transformer efficiency to increase by norm.Cross uprated by this that reduces as described above that dc voltage reduces transformer.
Many modification that existence can be formed by the present invention.At first here will be appreciated that, it is feasible omitting such dc voltage that reduces as mentioned above.
In rectifier and inverter, perhaps only in them, can omit such dc voltage and reduce.Then can be and be necessary that, the variation of target voltage is passed to other converter, in order to keep the expectation voltage difference on the DC power transmission line.
It should also be appreciated that one (for example the second current conversion station) in current conversion station can adopt tradition control to obtain dc voltage, that is, regulate the tap changer of winding by use and control, other current conversion station uses trigger angle control.
It is feasible even further changing creative concept in addition, and wherein tap changer is controlled and is combined with trigger angle control, in order to dc voltage is provided.Now with reference to Fig. 4, such situation is described.
Fig. 4 illustrates the circuit diagram of the part of the first current conversion station 12 according to a second embodiment of the present invention.
First group of S1 and second group of S2 converter valve element are arranged in Fig. 4.These converter valve elements are made of semiconductor element, and in embodiment shown here, the converter valve element is made of thyristor.Here, provide first group in the first converter 20A of current conversion station 12, and provide second group in another converter 20B of current conversion station 12.
In Fig. 4, the converter valve element of each converter is connected in series, to form the phase pin.In Fig. 4, each converter is shown only phase pin, more clearly understand in order to provide of the present invention.Will be appreciated that more such phase pin that are connected in parallel to each other are arranged usually, for example two.In the situation that an AC power transmission line that connects is three phase transmission line (this is normal condition), three phase pin are arranged in each converter.Here, the first converter 20A is connected between a DC power transmission line 14 and intermediate point, and another converter 20B is connected between ground wire and intermediate point.Fig. 4 also discloses two transformers (the first transformer 18A and another transformer 18B).Transformer 18A and 18B both have winding being connected to an AC power transmission line and are connected to the secondary winding of pin mutually.In the situation that the AC system is three-phase system, thereby three windings and three secondary winding are arranged.
As previously mentioned, the converter valve element is connected with being one another in series.In this illustration figure, in addition, exist the first converter valve element CV1, the second converter valve element CV2, the 3rd converter valve element CV3 and the 4th converter valve element CV4 to be connected in series between the first end and ground wire of DC power transmission line 14.This means that the 4th converter valve element CV4 is connected to ground wire at the first end place, and be connected to the first end of the 3rd converter valve element CV3 at place, second-phase opposite end.The 3rd converter valve element CV3 has the second end of the first end that is connected to the second converter valve element CV2, and the second end of the second converter valve element CV2 is connected to the first end of the first converter valve element CV1.The second end of the first converter valve element CV1 is connected to the first end of DC power transmission line 14.The first transformer 18A is connected to the junction surface between the first converter valve element CV1 and the second converter valve element CV2, and another transformer 18B is connected to the junction surface between the 3rd converter valve element CV3 and the 4th converter valve element CV4.
Here, the first converter valve element CV1 and the second converter valve element CV2 form first group of S1 converter valve element in the first converter 20A, and the 3rd converter valve element CV3 in another converter 20B and the 4th converter valve element CV4 form second group of S2 converter valve element.In this embodiment, thereby two converter valve elements are arranged in first group and second group.But what will be appreciated that is that it is feasible that more or less converter valve element is arranged in two groups.First group of converter valve element is provided the highest possible electromotive force at an end (at the second end place of the first converter valve element CV1), and this highest possible electromotive force is the first dc voltage V
DC1Electromotive force, and first group of converter valve element (at intermediate point or the place, junction surface between first group and second group of converter valve element) is provided lower electromotive force at the place, opposite end.
Be connected to the mode of converter valve element due to the first transformer 18A and another transformer 18B, the first transformer 18A moves in maximum potential, and another transformer 18B is in lower electromotive force operation.
Because another transformer 18B moves at lower electromotive force, so can make another transformer 18B less than the first transformer 18A.Therefore another transformer 18B also can be equipped with the adjusting winding, is exactly here such situation, and the first transformer 18A lacks such adjusting winding.Tap changer 54 is connected to this and regulates the winding (not shown) in addition.
In this second embodiment of the present invention, tap changer is controlled and is combined with trigger angle control.Complete this point by lower person, namely, the first 22 pairs of control units tap changer 54 provides control signal, so that another transformer 18B facilitates the lower electromotive force at the place, junction surface between first group and second group of converter valve, and simultaneously, provide control signal, to trigger first group of converter valve CV1 and CV2 in the S1 converter valve.After this manner, appreciablely be, the first control unit 22 is in conjunction with controlling, make another transformer 18B that moves on lower electromotive force by being controlled at tap changer, act on to make first, and be operatively connected to the first converter valve CV1 and the second converter valve CV2 of first group of S1 of the first transformer 18A by the Trigger Angle of controlling converter valve, to make the second effect, wherein, the common expectation dc voltage that forms of this effect.Thereby appreciablely in rectifier be that tap changer is controlled with delay angle and controlled combination, so that the first dc voltage V to be provided
DC1
Thereby, realized simplification top layer voltage converter design of transformer, still can realize the conventional tap changer control of standing simultaneously.
In a second embodiment, provide first group and second group of converter valve in different converters.Will be appreciated that, as alternative, can provide them in same converter.
Also feasible here is that the first control unit 22 is AC measuring voltage and reference voltages relatively, and depend on that this relatively changes target voltage.Here it should also be appreciated that and can realize the second current conversion station by the mode identical with above-described the first current conversion station, thereby and recognize, the second control unit is controlled and the commutation boundary Control in conjunction with tap changer.
In the modification of this second embodiment, also feasible is that other converter valve group is connected to the transformer of not regulating winding, and is subject to phase control.But also feasible be or change into feasible to be that other converter valve group is connected to the transformer of regulating winding, wherein, controls winding with tap changer.
Available many different modes realize control unit.For example can realize that the form of the computer of the functional computer program code of above-described control realizes control unit with carrying.
Also can be computer program with the invention provides, computer program comprises the computer readable device of load capacity calculation machine program code, such as memory, for example carries CD drive dish or the memory stick of program code above-mentioned.When carrier was loaded in computer, the program code of computer program was carried out of the present invention functional.Also can provide functional in server, and from will controlling the computer of the effect of unit functional downloading to server.
Discussion according to the front it is evident that, the present invention can change by various ways.Therefore it should be understood that the present invention is only limited by appended claims.
Claims (16)
1. the current conversion station (12 in a direct current power system (10); 16), described current conversion station is connected to AC power line (30; 32) and between DC transmission line (14), described current conversion station comprises:
Transformer (18; 24; 18A),
Converter (20; 26; 20A), it is equipped with converter valve (CV1, CV2), and at least the first group (S1) converter valve (CV1, CV2) is connected to described transformer, and
Control unit (22), it is configured to control described current conversion station, provides dc voltage (V with the end place in described DC transmission line
DC1V
DC2), and another current conversion station (16; 12) another dc voltage (V that produces at the place, opposite end of described DC transmission line
DC2V
DC1) together, facilitate the formation of voltage difference so that can be on described DC transmission line feed power,
It is characterized in that, described control unit is configured to control described converter, provides dc voltage with the trigger angle control of the described converter valve (CV1, CV2) that is connected to described transformer (18A) by use.
2. current conversion station according to claim 1, wherein, described control unit is configured to obtain be connected to the measuring voltage (V of the AC power transmission line of described current conversion station
M1, V
M2), more described measuring voltage and reference voltage (V
REF1, V
REF2), and if described measuring voltage lower than described reference voltage, reduce described dc voltage.
3. current conversion station according to claim 2, wherein, described control unit is configured to reduce described dc voltage according to the relation between described measuring voltage and described reference voltage.
4. according to claim 2 or 3 described current conversion stations, wherein, described reference voltage is arranged to corresponding to the voltage in the described AC power line at minimum trigger angle value place.
5. current conversion station described according to any one in aforementioned claim, described transformer (18A) only is connected to first group of (S1) converter valve (CV1, CV2), and in the highest possible electromotive force operation, and described current conversion station further comprises: another transformer (18B), it has second group of (S2) converter valve (CV3, CV4) of regulating winding, being connected to described current conversion station and moves at lower electromotive force; And the tap changer (54) that is connected to described adjusting winding, wherein, described control unit is configured to control described another transformer by the tap changer of described adjusting winding, in order to facilitate described dc voltage.
6. current conversion station described according to any one in aforementioned claim, wherein, described converter is rectifier, and described control unit is configured to control to be operatively connected to delay angle the valve of described transformer.
7. the described current conversion station of any one according to claim 1 to 5, wherein, described converter is inverter, and described control unit is configured to be operatively connected to the commutation boundary Control valve of described transformer.
8. current conversion station (12 of be used for controlling direct current power system (10); The method of the dc voltage that 16) provides, described current conversion station is connected to AC power line (30; 32) and between DC transmission line (14) and comprise:
Transformer (18; 24; 18A), and
Converter (20; 26; 20A), it is equipped with converter valve (CV1, CV2), and at least the first group (S1) converter valve (CV1, CV2) is connected to described transformer,
Said method comprising the steps of:
Control (35; 44) described current conversion station with by being operatively connected to the rectifier converter valve of described transformer with trigger angle control, provides dc voltage (V at an end place of described DC power transmission line
DC1V
DC2), so that and another current conversion station (16; 12) another dc voltage (V that produces at the place, opposite end of described DC transmission line
DC2V
DC1) together, facilitate the formation of voltage difference so that can be on described DC transmission line feed power.
9. method according to claim 8, described method is further comprising the steps: obtain (36; 46) measuring voltage (V of described AC power transmission line
M1V
M2), compare (38; 48) described measuring voltage and reference voltage (V
REF1, V
REF2), and if described measuring voltage lower than described reference voltage, reduce (42; 52) described dc voltage.
10. method according to claim 9, wherein, reduce (42; 52) step of described dc voltage comprises according to the relation between described measuring voltage and described reference voltage and reduces described dc voltage.
11. according to claim 9 or 10 described methods, wherein, described reference voltage is arranged to corresponding to the voltage in the described AC power line at minimum trigger angle value place.
12. the described method of any one according to claim 8 to 11, wherein, described transformer (18A) only is connected to first group of (S1) converter valve (CV1, CV2), and in the highest possible electromotive force operation, and described current conversion station further comprises: another transformer (18B), and it has the adjusting winding, is connected to second group of (S2) converter valve (CV3, CV4) and moves at lower electromotive force; And the tap changer (54) that is connected to described adjusting winding, wherein, the control step comprises by the tap changer of described adjusting winding controls described another transformer, in order to facilitate described dc voltage.
13. the described method of any one according to claim 8 to 12, wherein, described converter is rectifier, and comprises by changing the step that described Trigger Angle controls the valve of controlling to be operatively connected to described transformer with delay angle.
14. the described method of any one according to claim 8 to 12, wherein, described converter is inverter, and comprises by changing the step that described Trigger Angle controls the valve that is operatively connected to described transformer with the commutation boundary Control.
15. current conversion station (12 that is used for controlling direct current power system (10); The computer program of the dc voltage that 16) provides, described current conversion station is connected to AC power line (30; 32) and between DC transmission line (14) and comprise transformer (18; 24; 18A) and be equipped with converter valve (CV1, CV2) converter (20), at least the first group (S1) converter valve (CV1, CV2) is connected to described transformer, described computer program comprises the computer readable device of load capacity calculation machine program code
Described program code is configured to control described current conversion station, with by being operatively connected to the described converter valve of described transformer with trigger angle control, provides dc voltage (V at an end place of described DC power transmission line
DC1V
DC2), so that and another current conversion station (16; 12) another dc voltage (V that produces at the place, opposite end of described DC transmission line
DC2V
DC1) together, facilitate the formation of voltage difference, make it possible to feed power on described DC transmission line.
16. a direct current power system (10) that is connected between the first AC power line and the second AC power line (30,32), described direct current power system comprises:
The first current conversion station (12), it has the first transformer (18; 18A), the first control unit (22), and the rectifier (20 that is equipped with converter valve (CV1, CV2); 20A), at least the first group (S1) converter valve (CV1, CV2) is connected to described the first transformer,
The second current conversion station (16), it has the second transformer (24), the second control unit (28), and the inverter (26) that is equipped with converter valve, and at least the first group converter valve is connected to described the second transformer,
DC transmission line (14), the second end that it has the first end that is connected to described the first current conversion station and is connected to described the second current conversion station,
Wherein, described the first control unit (22) is configured to control described the first current conversion station, provides the first dc voltage (V with the first end place in DC transmission line
DC1), and described the second control unit is configured to control described the second current conversion station, provides the second dc voltage (V with the second end place in described DC transmission line
DC2), being provided at the voltage difference of feed power on described DC transmission line,
It is characterized in that, described the first control unit is configured to control described rectifier, the delay angle that is connected to the rectifier converter valve of described the first transformer with use is controlled, described the first dc voltage is provided, and described the second converter is configured to control described inverter, be connected to the commutation boundary Control of the converter valve of described the second transformer with use, described the second dc voltage is provided.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/EP2010/066347 WO2012055438A1 (en) | 2010-10-28 | 2010-10-28 | Voltage control in a direct current power system |
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| CN103181070A true CN103181070A (en) | 2013-06-26 |
| CN103181070B CN103181070B (en) | 2016-06-29 |
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| CN (1) | CN103181070B (en) |
| WO (1) | WO2012055438A1 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104600733A (en) * | 2014-12-23 | 2015-05-06 | 南京南瑞继保电气有限公司 | Phase changing control method and phase changing control device |
| CN107925358A (en) * | 2015-08-12 | 2018-04-17 | 通用电气公司 | Method and system for the current source high voltage direct current transmission system based on flue |
| CN109193742A (en) * | 2018-10-09 | 2019-01-11 | 武汉大学 | A kind of HVDC transmission system control method of anti-exchange disturbance |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3322062B1 (en) * | 2016-11-09 | 2022-09-07 | General Electric Technology GmbH | Improvements in or relating to power transmission networks |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2295506A (en) * | 1994-11-24 | 1996-05-29 | Gec Alsthom Ltd | HVDC converter control |
| CN1136229A (en) * | 1994-10-13 | 1996-11-20 | 瑞典通用电器勃朗勃威力公司 | Method and device for control of series-compensated converter station |
| CN1146830A (en) * | 1995-02-10 | 1997-04-02 | 瑞典通用电器勃朗勃威力公司 | Installation for transmission of electric power by means of high-voltage direct current |
| CN101297469A (en) * | 2006-01-18 | 2008-10-29 | Abb技术有限公司 | A transmission system and a method for control thereof |
| CN101325322A (en) * | 2008-04-09 | 2008-12-17 | 国网直流工程建设有限公司 | AC line-feeding deicing connection plan for current-exchanging station |
| CN101359876A (en) * | 2008-09-27 | 2009-02-04 | 北京网联直流工程技术有限公司 | DC system locking method for back-to-back DC networking project |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1413455C3 (en) | 1962-03-20 | 1980-09-18 | Asea Ab, Vaesteraas (Schweden) | Control arrangement for a high-voltage direct current transmission system |
| CA1233198A (en) | 1984-03-01 | 1988-02-23 | Helmut Neupauer | Method and apparatus to operate a high-voltage dc transmission system (hvdc) with automatic control of the converters |
| KR100795752B1 (en) | 2006-07-06 | 2008-01-21 | 명지대학교 산학협력단 | Voltage source converter system with pulse-interleaving auxiliary circuit for HVDC application |
-
2010
- 2010-10-28 WO PCT/EP2010/066347 patent/WO2012055438A1/en active Application Filing
- 2010-10-28 CN CN201080069834.8A patent/CN103181070B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1136229A (en) * | 1994-10-13 | 1996-11-20 | 瑞典通用电器勃朗勃威力公司 | Method and device for control of series-compensated converter station |
| GB2295506A (en) * | 1994-11-24 | 1996-05-29 | Gec Alsthom Ltd | HVDC converter control |
| CN1146830A (en) * | 1995-02-10 | 1997-04-02 | 瑞典通用电器勃朗勃威力公司 | Installation for transmission of electric power by means of high-voltage direct current |
| CN101297469A (en) * | 2006-01-18 | 2008-10-29 | Abb技术有限公司 | A transmission system and a method for control thereof |
| CN101325322A (en) * | 2008-04-09 | 2008-12-17 | 国网直流工程建设有限公司 | AC line-feeding deicing connection plan for current-exchanging station |
| CN101359876A (en) * | 2008-09-27 | 2009-02-04 | 北京网联直流工程技术有限公司 | DC system locking method for back-to-back DC networking project |
Non-Patent Citations (2)
| Title |
|---|
| M.P.BAHRMAN,: ""HVDC Transmission Overview"", 《TRANSMISSION AND DISTRBUTION CONFERENCE AND EXPOSITION》, 21 April 2008 (2008-04-21), pages 1 - 7, XP031250327 * |
| X.F.YUAN,ETC.: ""Simulation study for a Hybrid Multi-terminal HVDC System"", 《PES TD 2005/2006 MAY 21-24,2006,PISCATAWAY,NJ,USA,IEEE》, 1 January 2006 (2006-01-01), pages 720 - 725, XP031101901 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104600733A (en) * | 2014-12-23 | 2015-05-06 | 南京南瑞继保电气有限公司 | Phase changing control method and phase changing control device |
| CN107925358A (en) * | 2015-08-12 | 2018-04-17 | 通用电气公司 | Method and system for the current source high voltage direct current transmission system based on flue |
| CN109193742A (en) * | 2018-10-09 | 2019-01-11 | 武汉大学 | A kind of HVDC transmission system control method of anti-exchange disturbance |
| CN109193742B (en) * | 2018-10-09 | 2021-08-03 | 武汉大学 | Alternating current disturbance resistant high-voltage direct current transmission system control method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103181070B (en) | 2016-06-29 |
| WO2012055438A1 (en) | 2012-05-03 |
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