CN203406607U - Hybrid multi-terminal DC control system based on electric grid commutation current converter - Google Patents
Hybrid multi-terminal DC control system based on electric grid commutation current converter Download PDFInfo
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Abstract
The utility model provides a hybrid multi-terminal DC control system based on an electric grid commutation current converter. The hybrid multi-terminal DC control system comprises a DC current type control system and a DC voltage type control system, which is characterized in that: all parallel converter stations use the DC current type control system; all serial converter stations use the DC voltage type control system. When DC voltage drop occurs in one or more sending-end stations, and the voltage drops to the threshold which is preset by the system, the sending-end stations use the DC voltage type control system; accordingly, receiving-end stations with small laminated current margin value use the DC current type control system.
Description
Technical field
The utility model belongs to technical field of power systems, is specifically related to a kind of mixing multi-terminal HVDC transmission system and control system thereof based on electrical network commutation converter.
Background technology
Mixing multi-terminal HVDC transmission system based on electrical network commutation converter is that the current conversion station based on electrical network commutation converter and the current conversion station of a plurality of series connection based on electrical network commutation converter form by a plurality of parallel connections.There are two class formations in this mixing multi-terminal HVDC transmission system: a class is that current conversion station in parallel is sending end station, and the current conversion station of series connection is the mixing multi-terminal HVDC transmission system at receiving end station; One class is that the current conversion station of series connection is sending end station, and current conversion station in parallel is the mixing multi-terminal HVDC transmission system at receiving end station.This two class is mixed multi-terminal HVDC transmission system and is had potential different application.The unified control method and the control system basic structure separately that the present invention proposes the mixing multi-terminal HVDC transmission system of this two class based on electrical network commutation converter adopt.
At present, the multi-terminal HVDC transmission systematic research based on electrical network commutation converter and application concentrate on current conversion station parallel connection type multi-terminal HVDC transmission system and current conversion station tandem type multi-terminal HVDC transmission system.These two kinds of multi-terminal HVDC transmission systems respectively have superiority.Only from economy angle, consider, closely cost will be lower than current conversion station parallel connection type multi-terminal HVDC transmission system in situation at similar station (sending end station or receiving end station) for current conversion station tandem type multi-terminal HVDC transmission system.In addition,, in high altitude applications, adopt tandem type current conversion station can reduce the high height above sea level current conversion station class of insulation, thereby reduce costs.
So far, the mixing multi-terminal HVDC transmission system based on electrical network commutation converter consisting of above-mentioned parallel connection type current conversion station and tandem type current conversion station rarely has research and mentions.Yet this mixing multi-terminal HVDC transmission system has higher application prospect, especially China and with the similar national ，Ru of China's energy layout India, Brazil etc., be necessary this system further to study.
Utility model content
The utility model provides a kind of mixing multiterminal DC control system based on electrical network commutation converter, and it comprises direct current control system and direct voltage class control system, at all current conversion stations in parallel, adopts direct current control system; At all series connection current conversion stations, adopt direct voltage class control system.
According to most preferred embodiment of the present utility model, when one or more current conversion station in parallel occurs that direct voltage falls, and while dropping into the threshold value of default, this parallel connection current conversion station is used direct voltage class control system instead; Accordingly, will adopt in the series connection current conversion station of direct voltage class control system, the series connection current conversion station of the electric current margin value minimum of stack, transfers direct current control system to.
When transferring the series connection current conversion station of direct current control system to, also occur that direct voltage falls, and while dropping into the threshold values of default, this series connection current conversion station will be used direct voltage class control system again instead; Accordingly, by the series connection current conversion station of current employing direct voltage class control system, the series connection current conversion station of the electric current margin value minimum of stack, transfers direct current control system to.
According to most preferred embodiment of the present utility model, direct voltage class control system comprises minimum trigger angle control system, DC voltage control system and minimum turn-off angle control system.
According to one of them most preferred embodiment of the present utility model, to current conversion station in parallel, be sending end station, series connection current conversion station is the mixing four end DC transmission system at receiving end station; Two sending end stations in parallel adopt direct current control system; The receiving end station of two series connection adopts direct voltage class control system.
When one or two sending end station occurs that direct voltage falls, and while dropping into the threshold value of default, direct voltage class control system is used at this sending end station instead; Accordingly, direct current class control system is used at the receiving end station that the electric current margin value of stack is less instead.
When transferring the receiving end station of direct current control system to, also occur that direct voltage falls, and while dropping into the threshold values of default, this receiving end station will be used direct voltage class control system again instead; Accordingly, current another adopted to the receiving end station of direct voltage class control system, transfer direct current control system to.
According to another most preferred embodiment of the present utility model, to series connection current conversion station, be sending end station, current conversion station in parallel is the mixing four end DC transmission system at receiving end station; Two receiving end stations in parallel adopt direct current control system; The sending end station of two series connection adopts direct voltage class control system.
When one or two receiving end station occurs that direct voltage falls, and while dropping into the threshold value of default, direct voltage class control system is used at this receiving end station instead; Accordingly, direct current control system is used at the sending end station that the electric current margin value of stack is less instead.
When transferring the sending end station of direct current control system to, also occur that direct voltage falls, and while dropping into the threshold values of default, this sending end station will be used direct voltage class control system again instead; Accordingly, current another adopted to the sending end station of direct voltage class control system, transfer direct current control system to.
Accompanying drawing explanation
It is that sending end station/series connection current conversion station is the mixing multi-terminal HVDC transmission system at receiving end station that Figure 1A-1B is depicted as current conversion station in parallel; Wherein, Figure 1A is four corresponding end DC transmission system, Figure 1B be correspondence six end DC transmission system;
It is that sending end station/current conversion station in parallel is the mixing multi-terminal HVDC transmission system at receiving end station that Fig. 2 A-2B is depicted as series connection current conversion station; Wherein, Fig. 2 A is four corresponding end DC transmission system, and Fig. 2 B is six corresponding end DC transmission system;
Figure 3 shows that the control structure of two sending end station/two in parallel mixing four end DC transmission system that series connection receiving end station forms;
Figure 4 shows that and shown in Fig. 3, mix four end DC transmission system system DC voltage/current indicatrix in steady operation situation;
Figure 5 shows that and shown in Fig. 3, mix the DC voltage/current indicatrix after four end DC transmission system I1 direct voltages fall;
Figure 6 shows that and shown in Fig. 3, mix the DC voltage/current indicatrix after four end DC transmission system R1 direct voltages fall;
Fig. 7 A-7D mixes four end DC transmission system simulation results; Wherein Fig. 7 A is current conversion station R1, and Fig. 7 B is current conversion station R2, and Fig. 7 C is current conversion station I1, and Fig. 7 D is current conversion station I2;
Figure 8 shows that the control structure of the mixing four end DC transmission system that two series connection sending end station/two receiving end in parallel stations form;
Figure 9 shows that and shown in Fig. 8, mix four end DC transmission system system DC voltage/current indicatrix in steady operation situation.
Embodiment
Below with reference to accompanying drawing, the specific descriptions of optional execution mode of the present utility model have been provided.
The utility model relates generally to the mixing multi-terminal HVDC transmission system based on electrical network commutation converter that two classes have potential using value: Figure 1A-1B, and to be depicted as current conversion station in parallel be that sending end station/series connection current conversion station is the mixing multi-terminal HVDC transmission system at receiving end station; Wherein, Figure 1A is that current conversion station in parallel is that sending end station/series connection current conversion station is the four end DC transmission system at receiving end station, and Figure 1B is that current conversion station in parallel is that sending end station/series connection current conversion station is the six end DC transmission system at receiving end station.
As shown in Figure 1A, R1 and R2 are that two converting plants in parallel are sending end station, and I1 and I2 are that the Inverter Station of two series connection is receiving end station.L1, L2, L3 are the DC power transmission line between current conversion station.The AC system that current conversion station R1, R2, I2, the I1 that AC1, AC2, AC3, AC4 are respectively corresponding connects.As shown in Figure 1B, R1, R2 and R2 are that three converting plants in parallel are sending end station, and I1, I2 and I3 are that the Inverter Station of three series connection is receiving end station.L1, L2, L3, L4, L5 are the DC power transmission line between current conversion station.The AC system that current conversion station R1, R2, R2, I3, I2, the I1 that AC1, AC2, AC3, AC4, AC5, AC6 are respectively corresponding connects.The like, can show that a plurality of current conversion stations in parallel are that sending end station and a plurality of series connection current conversion station are the more multiterminal Hybrid HVDC system at receiving end station.Certainly, the current conversion station in parallel that this class is mixed multi-terminal HVDC transmission system is not need to be consistent with series connection current conversion station number, for example, can have three current conversion stations in parallel and two mixing five terminal DC transmission system that series connection current conversion station forms.
Above-mentioned current conversion station in parallel is that sending end station/series connection current conversion station is that in fact the mixing multi-terminal HVDC transmission system at receiving end station exists potential application at present.Sending end station in parallel can be conducive to realize " wind fire bundling " for connecting respectively thermoelectricity and the wind-powered electricity generation energy of different location, stabilizes the power fluctuation of wind-powered electricity generation by the Generation Control of thermoelectricity; And the receiving end station of series connection can be accessed respectively apart from close different regions or the AC network of different brackets, avoid areal/electrical network to access excessive direct current transportation energy, reduce DC Line Fault AC network is made a very bad impression.For example, thermoelectricity and wind-powered electricity generation in following the Northwest are tending towards carrying to " three China " load center area, to alleviate the excessive need for electricity in eastern region, therefore as previously mentioned, if adopt two current conversion stations in parallel, be that sending end station/two series connection current conversion station is that the mixing four end DC transmission system at receiving end station will have obvious advantage in technology and economy.From the technical characterstic of distance between sites/cost relation and parallel connection direct electric current, two sending end in parallel stations carry respectively thermoelectricity and wind-powered electricity generation more reasonable.Yet, at " three China " load center, seek the energy that two close drop points of distance or electrical network receive two series connection sending end stations, from the angle of power grid security and economy, see it is preferred version.
It is that sending end station/current conversion station in parallel is the mixing multi-terminal HVDC transmission system at receiving end station that Fig. 2 A-2B is depicted as series connection current conversion station; Wherein, Fig. 2 A is that series connection current conversion station is that sending end station/current conversion station in parallel is the four end DC transmission system at receiving end station, and Fig. 2 B is that series connection current conversion station is that sending end station/current conversion station in parallel is the six end DC transmission system at receiving end station.As shown in Figure 2 A, R1 and R2 are that the converting plant of two series connection is sending end station, and I1 and I2 are that two Inverter Station in parallel are receiving end station.L1, L2, L3 are the DC power transmission line between current conversion station.The AC system that current conversion station R1, R2, I2, the I1 that AC1, AC2, AC3, AC4 are respectively corresponding connects.As shown in Figure 2 B, R1, R2 and R2 are that the converting plant of three series connection is sending end station, and I1, I2 and I3 are that three Inverter Station in parallel are receiving end station.L1, L2, L3, L4, L5 are the DC power transmission line between current conversion station.The AC system that current conversion station R1, R2, R2, I3, I2, the I1 that AC1, AC2, AC3, AC4, AC5, AC6 are respectively corresponding connects.The like, can show that a plurality of series connection current conversion stations are that sending end station and a plurality of current conversion station in parallel are the more multiterminal Hybrid HVDC system at receiving end station.Certainly, the current conversion station in parallel that this class is mixed multi-terminal HVDC transmission system is not need to be consistent with series connection current conversion station number, for example, can have three series connection current conversion stations and two mixing five terminal DC transmission system that current conversion station in parallel forms.
Above-mentioned series connection current conversion station is that sending end station/current conversion station in parallel is that the mixing multi-terminal HVDC transmission system at receiving end station in fact also exists potential application at present.Shi high altitude localities, typical application scenario DC transmission system.In the sending end station of series connection, low-voltage current conversion station can be positioned over high altitude localities, require to reduce insulating Design difficulty, and high voltage current conversion station is positioned over low altitude area, thereby increases direct voltage thereby reduce voltage insulation, improves direct current transportation power; And two area far away with current conversion station spacing or electrical network are often applied in receiving end station in parallel.For example, China Tibet region and southwest hydroelectric resources are abundant, and the suitable hydroelectric station of setting up flows to " three China " load center area and Guangdong, Guangxi load center area.Therefore as previously mentioned, if adopt two series connection current conversion stations, be that sending end station/two current conversion station in parallel is that the mixing four end DC transmission system at receiving end station will have obvious advantage in technology and economy.In high height above sea level direct current transportation application, the Tibet region that low-voltage end current conversion station is positioned at high height above sea level reduces voltage insulation requirement and cost, and the southwest water power that the high voltage end current conversion station of series connection connects low height above sea level improves transmission voltage and power.Yet western water power flows to respectively " three China " load center and Guangdong and Guangxi Provinces load center conventionally.These two load center apart from each others, adopt two receiving end in parallel stations to access respectively two load centers at better economy.
According to upper surface analysis, two described classes are mixed multi-terminal HVDC transmission system and are all had potential application, are necessary further to study its control method and control system.
Current conversion station in parallel for above-mentioned introduction is that sending end station/series connection current conversion station is that the mixing multi-terminal HVDC transmission system at receiving end station and the current conversion station of connecting are that sending end station/current conversion station in parallel is the mixing multi-terminal HVDC transmission system at receiving end station, the utility model proposes unified control system.
The first most preferred embodiment of the present utility model, provides a kind of control system one that is applied to mix multi-terminal HVDC transmission system: in all current conversion stations in parallel, all adopt direct current control system; And all series connection current conversion stations all adopt direct voltage class control system (minimum trigger angle is controlled, DC voltage control or minimum turn-off angle control etc.).
Another most preferred embodiment of the present utility model, on the first most preferred embodiment basis, optimized control system, a kind of control system two that is applied to mix multi-terminal HVDC transmission system is provided, it applies when some current conversion station breaks down: when one or more current conversion station in parallel occurs that direct voltage falls, and while dropping into the threshold value of default, this parallel connection current conversion station is used direct voltage class control system instead; Accordingly, will adopt in the series connection current conversion station of direct voltage class control system, the series connection current conversion station of the electric current margin value minimum of stack, transfers direct current control system to.
Two kinds of control system for above-mentioned, are set as master control system for normal operation by control system one, and control system two is set as Beck-up Control System for special ruuning situation.Two kinds of control system also can independent utility.
In control system of the present utility model, if the electric current margin value that stack differs from one another on the current conversion station of series connection need to be for the direct current reference value of self direct current controller, when the system that can make once to move in control system automatically switches to two: one current conversion stations in parallel of control system and occurs that direct voltage falls in following situation, and this direct voltage falls the threshold value that reaches default, this parallel connection current conversion station can transfer direct voltage class to and control; Such as typical direct voltage class control-minimum trigger angle is controlled.And direct current nargin sets little series connection current conversion station and will automatically transfer constant DC current control to, other current conversion station keeps original control constant, and system is converted to control system two like this.
Apply control system of the present utility model, in normal operation, adopt control system for the moment, system can guarantee stable operation under some failure conditions, the direct voltage for example causing due to AC fault when certain current conversion station of connecting falls or fluctuates, control system one keeping system stable operation automatically.
Apply control system of the present utility model, in normal operation, adopt control system for the moment, system can be under some failure conditions automatically or control it and transfer control system two to, and keep stable operation.For example, the direct voltage of making due to AC fault when certain current conversion station of parallel connection falls, and this station will transfer DC voltage control (constant DC voltage control, minimum trigger angle is controlled or minimum turn-off angle is controlled) automatically to; Meanwhile, electric current nargin is set minimum series connection current conversion station and will be transferred direct current to and control; Now transfer control system two to, maintain system stable operation.
Current conversion station in parallel is that sending end station/series connection current conversion station is the mixing multi-terminal HVDC transmission system control structure design at receiving end station:
The utility model is that sending end station/series connection current conversion station is that the mixing multi-terminal HVDC transmission system control sytsem at receiving end station has designed the most basic structure and adopts to current conversion station in parallel.
The control structure of the mixing four end DC transmission system that form with two sending end station/two in parallel series connection receiving end station adopts and is designed to example and describes.Other the type mix multi-terminal HVDC transmission system control structure design can the like.
For this, mix four end DC transmission system as shown in Figure 3, according to control system of the present utility model, specific design is as follows:
One: two sending end station in parallel of control system (R1 and R2) adopts direct current to control; The receiving end station of two series connection (I1 and I2) adopts DC voltage control.
Control system two: one of them sending end in parallel station and a series connection receiving end station adopt direct current to control; Two current conversion stations in addition adopt direct voltage class to control, and wherein another sending end in parallel station adopts minimum trigger angle to control.
Fig. 3 has provided this basic control structure that mixes four end DC transmission system and has adopted.Wherein in the controller CE1 of two sending end in parallel station R1 and R2 and CE2, adopted respectively constant DC current control device CCA and the given α min of minimum trigger angle, for control system one and control system, adopted for two times.In the controller CE3 of two connect receiving end station I1 and I2 and CE4, adopted respectively constant DC voltage control device UCA, constant DC current control device CCA and minimum turn-off angle controller ECA, and the electric current nargin Imargin2 and the Imarginl (in this example, Imargin2 is greater than Imarginl) that in the input of constant DC current control device, have superposeed different.UCA and ECA are that the direct voltage class in control system one is controlled, and in application, optional one adopts.CFS in these four controller CE1～CE4 is control system selector, and CPG is valve control pulse generator.On four current conversion station controller upper stratas, adopt a master controller Master Control, for calculate generate direct current that current conversion station controller needs with reference to Idc1_ref, Idc2_ref, Idc1_ref+Idc2_ref and direct voltage with reference to Udc3_ref, Udc4_ref.TCL is transmission medium.
As shown in Figure 3, under normal rating ruuning situation, R1, R2 adopt constant DC current control device CCA to control, and I1, I2 adopt constant DC voltage control device UCA to control or minimum turn-off angle controller ECA controls.Now, DC voltage/current characteristic curve as shown in Figure 4.The voltage/current characteristic curve that in Fig. 4, R1, R2, I1, I2 indicative curve are each current conversion station.R1+R2, I1+I2 are the special indicatrix of the voltage/current at L2 two ends in Fig. 3.Each stain place is steady operation point separately.
Be illustrated in figure 4 and in Fig. 3, mix four end DC transmission system system DC voltage/current indicatrix in steady operation situation, when the receiving end station of a series connection occurs that due to certain fault direct voltage voltage falls, system still remains on control system stable operation once.The I1 direct voltage of take falls as example.As shown in Figure 5, when the direct voltage of I1 drops to I1 ', two sending end in parallel stations still can keep constant DC current control, and two series connection receiving end stations still can keep DC voltage control.Therefore control system is constant, just in DC voltage/current indicatrix, can find out, R1, R2, I1 steady operation point has separately reduced, and I2 is unaffected.
As shown in Figure 5, when one or two sending end stations in parallel occur that due to certain fault direct voltage voltage falls, system keeps stable operation by after metering-in control system two times.The sending end station R1 direct voltage of take falls as example.As shown in Figure 6, when the direct voltage of sending end station R1 drops to R1 ', R1 can not control direct current, and then proceed to minimum trigger angle control; And direct current nargin is set little series connection receiving end station and will automatically be transferred constant DC current control to; Two other current conversion station R2, I2 keep original control constant, and just steady operation point is slightly adjusted.Therefore system is converted to control system two, and system still can keep stable operation.
In the present embodiment, if transfer the series connection current conversion station of direct current control system to, also occur that direct voltage falls, and while dropping into the threshold values of default, this series connection current conversion station will be used direct voltage class control system again instead; Accordingly, by the series connection current conversion station of current employing direct voltage class control system, the series connection current conversion station of the electric current margin value minimum of stack, transfers direct current control system to.
Fig. 6 adopts design in order to verify the control structure the utility model proposes, and has set up simulation model.System design parameters is as follows:
System transmission capacity: 3200MW;
R1 and R2 rated direct voltage/electric current: 800kV/2kA;
I1 and I2 rated direct voltage/electric current: 400kV/4kA;
Simulation result as shown in Figure 7.State of a control indication in emulation: 0 is locking; 1 is constant DC current control; 2 is constant DC voltage control; 3 is minimum trigger angle state; 4 is maximum Trigger Angle state; 5 is forced-triggered horn shape state; 6 control for surely closing the angle of rupture;
In this emulation, from 0 second to 1.3 seconds, be system starting process; Within 1.3 seconds to 1.6 seconds, be that system stable operation is interval, now R1 and R2 adopt constant DC current control, and I1 and I2 adopt and surely close angle of rupture control, and system operates in control system one; At 1.6 seconds, start, the AC system voltage of R1 current conversion station falls 0.12p.u., and R1 transfers minimum trigger angle to and controls, and I1 current conversion station transfers constant DC current control system to; Since 1.78 seconds systems, enter stable state, operate in control system two.Simulation results show availability of the present utility model.
Series connection current conversion station is that sending end station/current conversion station in parallel is the mixing multi-terminal HVDC transmission system control structure design at receiving end station:
The utility model is that sending end station/current conversion station in parallel is that the mixing multi-terminal HVDC transmission system control sytsem at receiving end station has designed the most basic structure and adopts to series connection current conversion station.
The control structure employing of the mixing four end DC transmission system that form with two series connection sending end station/two receiving end in parallel stations is designed to example and describes.Other the type mix multi-terminal HVDC transmission system control structure design can the like.
For this, mix four end DC transmission system as shown in Figure 8, according to control system of the present utility model, specific design is as follows:
One: two receiving end station in parallel of control system (I1 and I2) adopts direct current to control; The sending end station of two series connection (R1 and R2) adopts DC voltage control.
Control system two: one of them receiving end in parallel station and a series connection send stream station to adopt direct current to control; Two current conversion stations in addition adopt direct voltage class to control.
Fig. 8 has also provided this and has mixed the basic control structure of four end DC transmission system.Wherein in the controller CE1 of two connect sending end station R1 and R2 and CE2, constant DC current control device CCA and the given α min of minimum trigger angle have been adopted respectively.In control system once, two controller CE1 and CE2 adopt α min to control direct voltage, certainly also can adopt a constant DC voltage control device herein.Control system two times, if transferring direct current to, R1 or R2 control, this controller is determined current controller CCA by corresponding employing.Electric current nargin Imargin2 and Imarginl (in this example, Imargin2 is greater than Imarginl) that the current controller CCA input of two current conversion stations has superposeed different.In the controller CE3 of two receiving end in parallel station I1 and I2 and CE4, adopted respectively constant DC current control device CCA, constant DC voltage control device UCA and minimum turn-off angle controller ECA.In control system once, two receiving end station control CE3 in parallel and CE4 adopt constant DC current control device CCA.Control system two times, transfer the receiving end station that direct voltage class controls to and can select UCA or ECA as DC voltage control, in application, optional one adopts.CFS in these four controller CE1～CE4 is control system selector, and CPG is valve control pulse generator.On four current conversion station controller upper stratas, adopt a master controller Master Control, for calculate generate direct current that current conversion station controller needs with reference to Idc1_ref, Idc2_ref, Idc1_ref+Idc2_ref and direct voltage with reference to Udc3_ref, Udc4_ref.TCL is transmission medium.
Under normal rating ruuning situation, R1, R2 adopt the given α min of minimum trigger angle, and I1, I2 adopt constant DC current control device CCA to control.Now, system DC voltage/current indicatrix is as shown in Figure 9 in steady operation situation shown in Fig. 8, to mix four end DC transmission system.The voltage/current characteristic curve that in Fig. 9, R1, R2, I1, I2 indicative curve are each current conversion station.R1+R2, I1+I2 are the special indicatrix of the voltage/current at L2 two ends in Fig. 8.Each stain place is steady operation point separately.
Situation with aforementioned two sending end station/two in parallel mixing four end DC transmission system that series connection receiving end station forms is similar, when the sending end station of one or two series connection occurs that due to certain fault direct voltage voltage falls, system still remains on control system stable operation once.When a receiving end station in parallel occurs that due to certain fault direct voltage voltage falls, system keeps stable operation by after metering-in control system two times.Now, occur that the receiving end in parallel station that voltage has fallen will transfer DC voltage control to, can adopt constant DC voltage control device UCA or surely close the angle of rupture and control ECA.In series connection sending end station, direct current nargin is set little receiving end station and will automatically be transferred to and determine DC controller CCA and control, and is R1 current conversion station in this example.Other two current conversion stations keep original control constant, and system still keeps stable operation.Because DC voltage/current indicatrix variation is herein similar with the situation of the mixing four end DC transmission system of the receiving end station composition of connecting with aforementioned two sending end station/two in parallel, therefore no longer accompanying drawing repeats.
Equally, if transfer the sending end station of direct current control system to, also occur that direct voltage falls, and while dropping into the threshold values of default, this sending end station will be used direct voltage class control system again instead; Accordingly, current another adopted to the sending end station of direct voltage class control system, transfer direct current control system to.
Although disclose for the purpose of illustration preferred embodiment of the present utility model and accompanying drawing, person skilled in the art, within not departing from the spirit and scope of the utility model and appended claim, can do various replacements, variation and retouching.Therefore, the utility model should not be limited to preferred embodiment and the disclosed content of accompanying drawing, and protection range of the present utility model is as the criterion with the scope that appending claims was defined.
Claims (10)
1. the mixing multiterminal DC control system based on electrical network commutation converter, it comprises direct current control system and direct voltage class control system, it is characterized in that: at all current conversion stations in parallel, adopt direct current control system; At all series connection current conversion stations, adopt direct voltage class control system.
2. the mixing multiterminal DC control system based on electrical network commutation converter according to claim 1, it is characterized in that: when one or more current conversion station in parallel occurs that direct voltage falls, and while dropping into the threshold value of default, this parallel connection current conversion station is used direct voltage class control system instead; Accordingly, will adopt in the series connection current conversion station of direct voltage class control system, the series connection current conversion station of the electric current margin value minimum of stack, transfers direct current control system to.
3. the mixing multiterminal DC control system based on electrical network commutation converter according to claim 2, it is characterized in that: when transferring the series connection current conversion station of direct current control system to, also occur that direct voltage falls, and while dropping into the threshold values of default, this series connection current conversion station will be used direct voltage class control system again instead; Accordingly, by the series connection current conversion station of current employing direct voltage class control system, the series connection current conversion station of the electric current margin value minimum of stack, transfers direct current control system to.
4. according to the mixing multiterminal DC control system based on electrical network commutation converter described in claim 1-3 any one, it is characterized in that: direct voltage class control system comprises minimum trigger angle control system, DC voltage control system and minimum turn-off angle control system.
5. the mixing multiterminal DC control system based on electrical network commutation converter according to claim 4, is characterized in that: to current conversion station in parallel, be sending end station, series connection current conversion station is the mixing four end DC transmission system at receiving end station; Two sending end stations in parallel adopt direct current control system; The receiving end station of two series connection adopts direct voltage class control system.
6. the mixing multiterminal DC control system based on electrical network commutation converter according to claim 5, it is characterized in that: when one or two sending end station occurs that direct voltage falls, and while dropping into the threshold value of default, direct voltage class control system is used at this sending end station instead; Accordingly, direct current class control system is used at the receiving end station that the electric current margin value of stack is less instead.
7. the mixing multiterminal DC control system based on electrical network commutation converter according to claim 6, it is characterized in that: when transferring the receiving end station of direct current control system to, also occur that direct voltage falls, and while dropping into the threshold values of default, this receiving end station will be used direct voltage class control system again instead; Accordingly, current another adopted to the receiving end station of direct voltage class control system, transfer direct current control system to.
8. the mixing multiterminal DC control system based on electrical network commutation converter according to claim 4, is characterized in that: to series connection current conversion station, be sending end station, current conversion station in parallel is the mixing four end DC transmission system at receiving end station; Two receiving end stations in parallel adopt direct current control system; The sending end station of two series connection adopts direct voltage class control system.
9. the mixing multiterminal DC control system based on electrical network commutation converter according to claim 8, it is characterized in that: when one or two receiving end station occurs that direct voltage falls, and while dropping into the threshold value of default, direct voltage class control system is used at this receiving end station instead; Accordingly, direct current control system is used at the sending end station that the electric current margin value of stack is less instead.
10. the mixing multiterminal DC control system based on electrical network commutation converter according to claim 9, it is characterized in that: when transferring the sending end station of direct current control system to, also occur that direct voltage falls, and while dropping into the threshold values of default, this sending end station will be used direct voltage class control system again instead; Accordingly, current another adopted to the sending end station of direct voltage class control system, transfer direct current control system to.
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| CN201320396651.8U CN203406607U (en) | 2013-07-04 | 2013-07-04 | Hybrid multi-terminal DC control system based on electric grid commutation current converter |
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| CN201320396651.8U CN203406607U (en) | 2013-07-04 | 2013-07-04 | Hybrid multi-terminal DC control system based on electric grid commutation current converter |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103997033A (en) * | 2014-05-23 | 2014-08-20 | 华北电力大学 | High-voltage direct-current transmission system with direct-current fault ride-through capacity |
| WO2016116057A1 (en) * | 2015-01-21 | 2016-07-28 | 南京南瑞继保电气有限公司 | High-voltage direct-current power-transmission series valve group control device |
| CN110460087A (en) * | 2019-09-26 | 2019-11-15 | 长沙理工大学 | A kind of modified determines hold-off angle control method |
| CN113541183A (en) * | 2021-06-11 | 2021-10-22 | 中国长江三峡集团有限公司 | Series multi-terminal bipolar direct-current power transmission system |
-
2013
- 2013-07-04 CN CN201320396651.8U patent/CN203406607U/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103997033A (en) * | 2014-05-23 | 2014-08-20 | 华北电力大学 | High-voltage direct-current transmission system with direct-current fault ride-through capacity |
| CN103997033B (en) * | 2014-05-23 | 2016-06-29 | 华北电力大学 | A kind of HVDC transmission system possessing DC Line Fault ride-through capability |
| WO2016116057A1 (en) * | 2015-01-21 | 2016-07-28 | 南京南瑞继保电气有限公司 | High-voltage direct-current power-transmission series valve group control device |
| US10148091B2 (en) | 2015-01-21 | 2018-12-04 | Nr Electric Co., Ltd. | High voltage direct current power transmission series valve group control device |
| CN110460087A (en) * | 2019-09-26 | 2019-11-15 | 长沙理工大学 | A kind of modified determines hold-off angle control method |
| CN113541183A (en) * | 2021-06-11 | 2021-10-22 | 中国长江三峡集团有限公司 | Series multi-terminal bipolar direct-current power transmission system |
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