CN109861263A - A kind of method and system reducing extra-high voltage direct-current non-faulting layer commutation failure risk - Google Patents
A kind of method and system reducing extra-high voltage direct-current non-faulting layer commutation failure risk Download PDFInfo
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Abstract
The invention discloses a kind of method and system for reducing extra-high voltage direct-current non-faulting layer commutation failure risk, belong to field of power system.The method of the present invention includes: to obtain layering feed-in extra-high voltage direct-current serial-parallel power grid parameter, calculates layering feed-in extra-high voltage direct-current serial-parallel power grid failure layer and non-faulting layer commutation failure characteristic；Layering feed-in extra-high voltage direct-current serial-parallel power grid non-faulting layer parameter is obtained, the critical DC current i of commutation failure prediction linkage control is calculated according to non-faulting layer parameterdcr；Prediction linkage control is carried out to layering feed-in extra-high voltage direct-current serial-parallel power grid；Determine whether PREDICTIVE CONTROL acts according to layering feed-in extra-high voltage direct-current serial-parallel power grid change of current busbar voltage and DC current variation；Realistically displayed predicts linkage control extra-high voltage direct-current non-faulting layer commutation failure risk and linkage control parameter.The present invention can be effectively reduced the risk that the disturbance of failure layer causes non-faulting layer Commutation Failure, reduces disturbance and dc power is caused to fluctuate the active impact to power grid.
Description
Technical field
The present invention relates to field of power systems, and change more particularly, to a kind of reduction extra-high voltage direct-current non-faulting layer
The method and system of phase risk of failure.
Background technique
The non-renewable energy such as coal in China, water energy, wind energy and solar energy are enriched with region, and economically developed use can collect with the central and east
Middle area has contrary distribution feature.This feature objectively requires to greatly develop large capacity high-effect long distance technology of transmission of electricity-
Extra-high voltage direct-current transmission technology, to promote most optimum distribution of resources ability and efficiency.In receiving end power grid, with direct current feed-in quantity and
The growth of capacity, stablizes caused by voltage support scarce capacity to threaten and is on the rise.To alleviate large capacity extra-high voltage direct-current single-point
The adverse effect of feed-in, China is pioneering to propose a kind of direct current with novel topological structure-layering feed-in direct current.
It is different from traditional extra-high voltage direct-current, the layering high-end inverter of feed-in extra-high voltage direct-current is respectively connected to low side inverter
The AC network of different voltages grade, i.e. different layers AC network.Except the friendship having between this layer of AC network and DC inversion station
Outside mutual coupling action path, also there is new coupling path --- interlayer dc-couple path and interlayer AC coupled road
Diameter, newly-increased coupling path keep disturbed rear alternating current-direct current dynamic behaviour increasingly complex.
Failure layer inverter change of current busbar voltage is quickly fallen in change procedure, and non-faulting layer inverter blow-out angle is because of direct current
Electric current increases and reduces, and since its alternating voltage maintains higher level that can not trigger the movement of commutation failure PREDICTIVE CONTROL,
Commutation failure risk will be present in non-faulting layer.After non-faulting layer commutation failure, on the one hand, failure layer inverter is fast because of DC current
Speed, which increases, offsets the effect of its commutation failure PREDICTIVE CONTROL, commutation failure will also occurs, the active blocking of caused direct current therewith will be right
Receiving end AC network is sent to form the active impact of large capacity；On the other hand, during the active recovery after commutation failure, non-faulting layer compared with
High alternating voltage acts on compensator, so that Inverter Station a large amount of surpluses is occurred idle, and then this layer of AC network is made to face electricity
Press impact threat.
Summary of the invention
In view of the above-mentioned problems, the invention proposes a kind of sides for reducing extra-high voltage direct-current non-faulting layer commutation failure risk
Method, comprising:
Layering feed-in extra-high voltage direct-current serial-parallel power grid parameter is obtained, layering feed-in extra-high voltage direct-current serial-parallel power grid failure is calculated
Layer and non-faulting layer commutation failure characteristic；
Layering feed-in extra-high voltage direct-current serial-parallel power grid non-faulting layer parameter is obtained, commutation is calculated according to non-faulting layer parameter and is lost
Lose the critical DC current i of prediction linkage controldcr；
Prediction linkage control is carried out to layering feed-in extra-high voltage direct-current serial-parallel power grid；
PREDICTIVE CONTROL is determined according to layering feed-in extra-high voltage direct-current serial-parallel power grid change of current busbar voltage and DC current variation
Whether act；
Realistically displayed predicts linkage control extra-high voltage direct-current non-faulting layer commutation failure risk and linkage control parameter.
Optionally, the critical DC current i of commutation failure prediction linkage control is calculateddcr, calculation formula is as follows:
Wherein, UcIt is that the triggering that inverter control system exports is advanced for the change of current busbar voltage of non-faulting layer inverter, β
Angle and γcrFor meter and the setting critical extinction angle of nargin, XcIt is converter power transformer no-load voltage ratio for converter power transformer leakage reactance, T.
Optionally, prediction linkage control is carried out to layering feed-in extra-high voltage direct-current serial-parallel power grid, it is extra-high for layering feed-in
Commutation failure risk failure layer in straightening stream, the non-faulting layer that DC current caused by ac short circuit impacts increases and causes change
Phase risk of failure, increases commutation failure and predicts linkage control function, starts information and DC current according to failure layer commutation failure
Variation degree differentiates the control function of starting commutation failure prediction.
Optionally, determined according to layering feed-in extra-high voltage direct-current serial-parallel power grid change of current busbar voltage and DC current variation pre-
Survey controls whether to act, and failure layer short trouble causes failure layer Commutation Failure PREDICTIVE CONTROL to act, when failure layer changes
Mutually unsuccessfully control active flag FcfSet and id>idcrWhen, start commutation failure forecast function.
Optionally, realistically displayed prediction linkage control effect and linkage control parameter, it is pre- that non-faulting layer configures commutation failure
Survey linkage control function, scanning calculates failure layer three phase short circuit fault comprehensively, according to the non-event of prediction linkage control extra-high voltage direct-current
The adjustable optimization linkage control parameter of barrier layer commutation failure risk, is adjusted and increases gain coefficient Gi, increase PREDICTIVE CONTROL output
Inverter Trigger Angle.
The present invention also provides a kind of system for reducing extra-high voltage direct-current non-faulting layer commutation failure risk, present system packets
It includes:
Get parms module, obtains layering feed-in extra-high voltage direct-current serial-parallel power grid parameter, calculates the layering extra-high straightening of feed-in
Flow serial-parallel power grid failure layer and non-faulting layer commutation failure characteristic；
Computing module obtains layering feed-in extra-high voltage direct-current serial-parallel power grid non-faulting layer parameter, according to non-faulting layer parameter
Calculate the critical DC current i of commutation failure prediction linkage controldcr；
Control module carries out prediction linkage control to layering feed-in extra-high voltage direct-current serial-parallel power grid；
Determination module determines according to layering feed-in extra-high voltage direct-current serial-parallel power grid change of current busbar voltage and DC current variation
Whether PREDICTIVE CONTROL acts；
Simulation Control module, realistically displayed predict linkage control extra-high voltage direct-current non-faulting layer commutation failure risk and linkage
Control parameter.
The present invention can be effectively reduced the risk that the disturbance of failure layer causes non-faulting layer Commutation Failure, reduce disturbance
Dc power is caused to fluctuate the idle voltge surge to power grid of Inverter Station surplus during the active impact to power grid, and recovery.
Detailed description of the invention
Fig. 1 is a kind of method layering feed-in extra-high voltage for reducing extra-high voltage direct-current non-faulting layer commutation failure risk of the present invention
Direct current serial-parallel power grid direct-current commutation failure predicts linkage control illustraton of model；
Fig. 2 is that whether there is or not commutation failures is pre- for a kind of method for reducing extra-high voltage direct-current non-faulting layer commutation failure risk of the present invention
Survey the DC current response contrast curve chart under the conditions of linkage control；
Fig. 3 is that a kind of method for reducing extra-high voltage direct-current non-faulting layer commutation failure risk of the present invention is predicted without commutation failure
High low side inverter blow-out angular curve figure when linkage control；
Fig. 4 is that a kind of method for reducing extra-high voltage direct-current non-faulting layer commutation failure risk of the present invention has commutation failure prediction
High low side inverter blow-out angular curve figure when linkage control；
Fig. 5 is that whether there is or not commutation failures is pre- for a kind of method for reducing extra-high voltage direct-current non-faulting layer commutation failure risk of the present invention
Survey the active response contrast curve chart of direct current under the conditions of linkage control；
Fig. 6 is that whether there is or not commutation failures is pre- for a kind of method for reducing extra-high voltage direct-current non-faulting layer commutation failure risk of the present invention
Survey the change of current busbar voltage response contrast curve chart under the conditions of linkage control；
Fig. 7 is that whether there is or not commutation failures is pre- for a kind of method for reducing extra-high voltage direct-current non-faulting layer commutation failure risk of the present invention
Survey the change of current busbar voltage response contrast model figure under the conditions of linkage control；
Fig. 8 is a kind of method layering feed-in extra-high voltage for reducing extra-high voltage direct-current non-faulting layer commutation failure risk of the present invention
Direct current serial-parallel power grid monopole topology diagram；
Fig. 9 is a kind of method layering feed-in extra-high voltage for reducing extra-high voltage direct-current non-faulting layer commutation failure risk of the present invention
Direct current serial-parallel power grid direct-flow inverter Controlling model figure；
Figure 10 is a kind of method flow diagram for reducing extra-high voltage direct-current non-faulting layer commutation failure risk of the present invention；
Figure 11 is a kind of system construction drawing for reducing extra-high voltage direct-current non-faulting layer commutation failure risk of the present invention.
Specific embodiment
The present invention provides a kind of method for reducing extra-high voltage direct-current non-faulting layer commutation failure risk, as shown in Figure 10, packet
It includes:
Layering feed-in extra-high voltage direct-current serial-parallel power grid parameter is obtained, layering feed-in extra-high voltage direct-current serial-parallel power grid failure is calculated
Layer and non-faulting layer commutation failure characteristic；
It is layered feed-in extra-high voltage direct-current serial-parallel power grid system structure, as shown in figure 8, positive and negative anodes have symmetrical structure, with ±
800kV extra-high voltage direct-current is layered for feedthrough system anode, and in receiving end DC side, voltage rating is the high-end and low of 400kV
12 pulsation inverter of end is connected in series；Side is exchanged in receiving end, high and low end inverter is respectively connected to that alternating voltage grade is different to change
Bus is flowed, and is furnished with independent filtering and reactive power compensator.From topological structure, extra-high voltage direct-current is layered feedthrough system,
As 3 end DC transmission system of tandem type.Consider from converter power transformer insulating requirements are reduced, high and low end inverter is respectively connected to
Low AC voltage grade (such as 500kV) and voltage levels (such as 1000kV).
DC control is to influence the important link of the disturbed respondent behavior of alternating current-direct current.It is layered the inverter control of feed-in extra-high voltage direct-current
Simulation, as shown in figure 9, extra-high voltage direct-current is layered feedthrough system, high and low the feed-in of end inverter 2 have different system parameter
With the AC network of operation characteristic, therefore, high and low end inverter need to use relatively independent controller.
It is layered feedthrough system towards extra-high voltage direct-current, the Controlling model suitable for electromechanical transient simulation established and developed is such as
Shown in Fig. 9.Wherein, high and low end inverter determines gamma kick, constant current control and commutation failure prediction with independent
Control, current limiting low-voltage (Voltage Dependent Current Order Limit, VDCOL) analog functuion, in addition, rectification
There is device constant current control, constant dc power control and minimum trigger angle to limit analog functuion.It should be pointed out that being become by the change of current
Depressor tap adjusts at a slow speed the high and low end inverter direct-current voltage balance control of realization, can refuse in electromechanical transient simulation
Simulation.
For the AC network of layering extra-high voltage direct-current feed-in, the impact of failure layer AC network three phase short circuit fault is calculated
Under, non-faulting layer Commutation Failure characteristic.Assessment is influenced by failure layer, and the wind of commutation failure occurs for non-faulting layer inverter
Danger and commutation failure cause dc power fluctuation to the impact threat of AC-DC hybrid power grid safe and stable operation.If not therefore
There are commutation failure risks for barrier layer, and the active fluctuation of direct current caused by commutation failure threatens serial-parallel power grid safety, then needs to take to change
Phase failure prediction linkage control detects the disturbed electrical quantity of alternating current-direct current, and implements control accordingly, increases the inverter blow-out of non-faulting layer
Angle is to reduce its risk that commutation failure occurs.
Layering feed-in extra-high voltage direct-current serial-parallel power grid non-faulting layer parameter is obtained, commutation is calculated according to non-faulting layer parameter and is lost
Lose the critical DC current i of prediction linkage controldcr；
In conjunction with the change of current busbar voltage U of non-faulting layer inverterc, inverter control system output gating advance angle β, with
And the setting critical extinction angle γ of meter and nargincr, corresponding critical DC current i is calculated using formuladcr, XcFor change of current transformation
Device leakage reactance, T are converter power transformer no-load voltage ratio.Calculation formula is as follows:
Prediction linkage control is carried out to layering feed-in extra-high voltage direct-current serial-parallel power grid；
Falling amplitude, ao U with non-faulting layer change of current busbar voltagecDifferentiate the both active of starting commutation failure PREDICTIVE CONTROL
On the basis of energy, for commutation failure risk new present in layering feed-in extra-high voltage direct-current --- failure layer ac short circuit rushes
Hitting causes DC current to increase and then causes the risk of non-faulting layer commutation failure, increases commutation failure and predicts linkage control function
Can, i.e., based on failure layer commutation failure starting information and DC current variation degree, differentiate the new of starting commutation failure prediction
Control function.
PREDICTIVE CONTROL is determined according to layering feed-in extra-high voltage direct-current serial-parallel power grid change of current busbar voltage and DC current variation
Whether act；
Failure layer short trouble causes this layer of Commutation Failure PREDICTIVE CONTROL movement, but due to abort situation and non-event
Barrier layer inverter electrical distance farther out, therefore, non-faulting layer inverter change of current busbar voltage amplitude of variation Δ UcLess than 1-Ucf, pass
System commutation failure PREDICTIVE CONTROL cannot work.But DC current is greater than critical DC current idcr, show that failure layer exchanges
Power grid faulty generation, and be affected by this, non-faulting layer inverter faces biggish commutation failure risk, when failure layer commutation
Failure control active flag FcfSet and id>idcrWhen, increased commutation failure forecast function will start, and can be realized and event
The linkage of barrier layer commutation failure control increases non-faulting layer inverter blow-out angle to reduce commutation failure risk.
Realistically displayed predicts linkage control extra-high voltage direct-current non-faulting layer commutation failure risk and linkage control parameter.
Meter and non-faulting layer commutation failure predict linkage control function, and scanning calculates failure layer three phase short circuit fault comprehensively,
Assessing linkage control reduces the effect of non-faulting layer Inverter Station commutation failure risk.According to the adjustable optimization linkage control ginseng of effect
Number, for example reinforcing effect are adjustable to increase gain coefficient Gi, further increases the inverter Trigger Angle of PREDICTIVE CONTROL output.
It is layered feedthrough system model based on extra-high voltage direct-current, in power system simulation software PSD-BPA, building such as Fig. 7
Shown in test macro.Wherein, DC rated voltage, electric current and power respectively ± 800kV, 6.25kA and 10000MW,
High and low end inverter is respectively connected to 500kV and 1000kV AC network.
When normal operation, rectifier uses constant dc power control, and high and low end inverter, which uses, determines gamma kick and control ginseng
Number setting is identical.The relevant parameter value of commutation failure PREDICTIVE CONTROL are as follows: Ucf=0.80pu, Gcf=0.035；VDCOL starting electricity
Pressure gate threshold value udhFor 0.75pu.Equivalent impedance ZmAnd ZsH、ZsLIn resistive component be zero, reactive component Xm、XsH、XsLRespectively
For 0.06pu and 1.0 × 10-4pu, 0.00691pu.System reference capacity is taken as 100MVA.
Corresponding EsThe quick voltage for falling 0.4pu, which rises and falls, to be disturbed, and commutation failure will occur in layering extra-high voltage direct-current.Investigation is matched
The effect of commutation failure prediction linkage control as shown in Figure 1 is set, wherein relative parameters setting is as follows: Uc=0.8pu, Gcf=
0.035、Tu=Ti=0.1, Tcf=0.02, Gi=0.05, Δ idcf=0.1pu.
Whether there is or not prediction linkage control, it is as shown in Figures 2 to 6 that extra-high voltage direct-current is layered feedthrough system transient response comparison.From
When in figure as can be seen that without linkage control, failure layer alternating voltage falls caused idIt increases, reduces non-faulting layer γ simultaneously
There is commutation failure, later idRapid growth, though failure layer γ increases through this layer of PREDICTIVE CONTROL, by idIncreasing influences to go out
Existing commutation failure, the corresponding active blocking for nearly 200ms occur of direct current are significantly active to sending receiving end AC network to cause respectively
Surplus and vacancy impact.In addition, non-faulting layer Inverter Station reactive power consumption is greatly decreased during dc power blocks and restores, mend
Repaying device substantially surplus is idle impacts alternating voltage to 1.22pu, as shown in Figure 6.
After configuration prediction linkage control, when failure layer commutation failure has been turned on and DC current deviation is greater than the set value idcr
Afterwards, non-faulting layer commutation failure PREDICTIVE CONTROL starting increases inverter blow-out angle, thus can effectively avoid commutation failure, it is corresponding straight
Stream power and alternating voltage are after slightly changing, fast quick-recovery stable operation.
The present invention also provides a kind of systems 200 for reducing extra-high voltage direct-current non-faulting layer commutation failure risk, such as Figure 11 institute
Show, system 200 includes:
The module that gets parms 201 obtains layering feed-in extra-high voltage direct-current serial-parallel power grid parameter, calculates layering feed-in extra-high voltage
Direct current serial-parallel power grid failure layer and non-faulting layer commutation failure characteristic；
Computing module 202 obtains layering feed-in extra-high voltage direct-current serial-parallel power grid non-faulting layer parameter, is joined according to non-faulting layer
Number calculates the critical DC current i of commutation failure prediction linkage controldcr；
Control module 203 carries out prediction linkage control to layering feed-in extra-high voltage direct-current serial-parallel power grid；
Determination module 204 changes according to layering feed-in extra-high voltage direct-current serial-parallel power grid change of current busbar voltage and DC current
Determine whether PREDICTIVE CONTROL acts；
Simulation Control module 205, realistically displayed predict linkage control extra-high voltage direct-current non-faulting layer commutation failure risk and
Linkage control parameter.
The present invention can be effectively reduced the risk that the disturbance of failure layer causes non-faulting layer Commutation Failure, reduce disturbance
Dc power is caused to fluctuate the idle voltge surge to power grid of Inverter Station surplus during the active impact to power grid, and recovery.
Claims (6)
1. a kind of method for reducing extra-high voltage direct-current non-faulting layer commutation failure risk, which comprises
Obtain layering feed-in extra-high voltage direct-current serial-parallel power grid parameter, calculate layering feed-in extra-high voltage direct-current serial-parallel power grid failure layer with
Non-faulting layer commutation failure characteristic；
Layering feed-in extra-high voltage direct-current serial-parallel power grid non-faulting layer parameter is obtained, it is pre- to calculate commutation failure according to non-faulting layer parameter
Survey the critical DC current i of linkage controldcr；
Prediction linkage control is carried out to layering feed-in extra-high voltage direct-current serial-parallel power grid；
Whether PREDICTIVE CONTROL is determined according to layering feed-in extra-high voltage direct-current serial-parallel power grid change of current busbar voltage and DC current variation
Movement；
Realistically displayed predicts linkage control extra-high voltage direct-current non-faulting layer commutation failure risk and linkage control parameter.
2. according to the method described in claim 1, the critical DC current for calculating commutation failure prediction linkage control
idcr, calculation formula is as follows:
Wherein, UcFor the change of current busbar voltage of non-faulting layer inverter, β be inverter control system output gating advance angle and
γcrFor meter and the setting critical extinction angle of nargin, XcIt is converter power transformer no-load voltage ratio for converter power transformer leakage reactance, T.
3. according to the method described in claim 1, described carry out prediction linkage to layering feed-in extra-high voltage direct-current serial-parallel power grid
Control, for the commutation failure risk failure layer in layering feed-in extra-high voltage direct-current, DC current caused by ac short circuit impacts
The non-faulting layer commutation failure risk for increasing and causing increases commutation failure and predicts linkage control function, according to failure layer commutation
Failure starting information and DC current variation degree differentiate the control function of starting commutation failure prediction.
4. according to the method described in claim 1, described according to layering feed-in extra-high voltage direct-current serial-parallel power grid change of current bus electricity
Pressure and DC current variation determine whether PREDICTIVE CONTROL acts, and failure layer short trouble causes failure layer Commutation Failure pre-
Control action is surveyed, when failure layer commutation failure controls active flag FcfSet and id>idcrWhen, start the pre- measurement of power of commutation failure
Energy.
5. according to the method described in claim 1, the realistically displayed prediction linkage control effect and linkage control parameter, non-
Failure layer configures commutation failure and predicts linkage control function, and scanning calculates failure layer three phase short circuit fault comprehensively, is joined according to prediction
The dynamic adjustable optimization linkage control parameter of control extra-high voltage direct-current non-faulting layer commutation failure risk, is adjusted and increases gain coefficient
Gi, increase the inverter Trigger Angle of PREDICTIVE CONTROL output.
6. a kind of system for reducing extra-high voltage direct-current non-faulting layer commutation failure risk, the system comprises:
Get parms module, obtains layering feed-in extra-high voltage direct-current serial-parallel power grid parameter, and it is mixed to calculate layering feed-in extra-high voltage direct-current
Join electric network fault layer and non-faulting layer commutation failure characteristic；
Computing module obtains layering feed-in extra-high voltage direct-current serial-parallel power grid non-faulting layer parameter, is calculated according to non-faulting layer parameter
The critical DC current i of commutation failure prediction linkage controldcr；
Control module carries out prediction linkage control to layering feed-in extra-high voltage direct-current serial-parallel power grid；
Determination module determines prediction according to layering feed-in extra-high voltage direct-current serial-parallel power grid change of current busbar voltage and DC current variation
It controls whether to act；
Simulation Control module, realistically displayed predict linkage control extra-high voltage direct-current non-faulting layer commutation failure risk and linkage control
Parameter.
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| CN110474358A (en) * | 2019-08-28 | 2019-11-19 | 华北电力大学（保定） | Inhibit the control method of continuous commutation failure under extra-high voltage direct-current layer-specific access mode |
| CN111541261A (en) * | 2020-05-11 | 2020-08-14 | 国网河北省电力有限公司经济技术研究院 | Nonlinear dynamic current deviation control method and device and terminal equipment |
| CN111769586A (en) * | 2020-07-24 | 2020-10-13 | 合肥工业大学 | Commutation failure suppression method for non-fault layer converter of layered access UHVDC system |
| CN112909943A (en) * | 2021-05-10 | 2021-06-04 | 国网江西省电力有限公司电力科学研究院 | Commutation failure prediction-based direct current control function strategy optimization method and device |
| CN113507132A (en) * | 2021-06-07 | 2021-10-15 | 国网四川省电力公司 | Optimization method and system for relieving direct current restart control parameters |
| CN114779017A (en) * | 2022-05-16 | 2022-07-22 | 电子科技大学 | Simultaneous commutation failure prediction method for simultaneous transmission and reception system |
| CN115117915A (en) * | 2022-07-12 | 2022-09-27 | 国网安徽省电力有限公司 | Comprehensive evaluation method for commutation failure risk of layered access extra-high voltage direct current transmission system |
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| CN110474358A (en) * | 2019-08-28 | 2019-11-19 | 华北电力大学（保定） | Inhibit the control method of continuous commutation failure under extra-high voltage direct-current layer-specific access mode |
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| CN112909943A (en) * | 2021-05-10 | 2021-06-04 | 国网江西省电力有限公司电力科学研究院 | Commutation failure prediction-based direct current control function strategy optimization method and device |
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| CN114779017A (en) * | 2022-05-16 | 2022-07-22 | 电子科技大学 | Simultaneous commutation failure prediction method for simultaneous transmission and reception system |
| CN115117915A (en) * | 2022-07-12 | 2022-09-27 | 国网安徽省电力有限公司 | Comprehensive evaluation method for commutation failure risk of layered access extra-high voltage direct current transmission system |
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