CN109167400A - A kind of method and system for the voltage stability determining more feed-in ac and dc systems - Google Patents
A kind of method and system for the voltage stability determining more feed-in ac and dc systems Download PDFInfo
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- CN109167400A CN109167400A CN201810995033.2A CN201810995033A CN109167400A CN 109167400 A CN109167400 A CN 109167400A CN 201810995033 A CN201810995033 A CN 201810995033A CN 109167400 A CN109167400 A CN 109167400A
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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
- H02J5/00—Circuit arrangements for transfer of electric power between ac networks and dc networks
Abstract
The invention discloses a kind of method and system of voltage stability for determining more feed-in ac and dc systems, comprising: determines the DC loop sum of more feed-in ac and dc systems, and calculates more feed-in short-circuit ratioes of each DC loop；Calculate separately more feed-in interaction factors between any two DC loop；Calculate separately critical more feed-in interaction factors between any two DC loop；More feed-in short-circuit ratioes, more feed-in interaction factors and critical more feed-in interaction factors are compared with the Rule of judgment in default judgment rule, determine the voltage stability of more feed-in ac and dc systems.The present invention considers the influence of more feed-in interaction factors, compensate for deficiency when more feed-in short-circuit ratio indexs judge the voltage stability of more feed-in ac and dc systems, it can be applied to the fields such as ac and dc systems planning, design and operation, it is simple and efficient, for instructing the planning of bulk power grid and safeguarding that the safe and stable operation of bulk power grid is of great significance.
Description
Technical field
The present invention relates to Power System Planning and running technology field, and more particularly, to a kind of more feed-ins of determination
The method and system of the voltage stability of ac and dc systems.
Background technique
Due to DC converter need to absorb at runtime a large amount of reactive power (about the 50% of direct current transmission power~
60%), so that the Enhancement of Transient Voltage Stability of ac and dc systems faces a severe test after big interference.The catastrophe failure of direct current system
(such as bipolar locking failure) will lead to trend and largely shift, once voltage reduces, the nothing of induction motor load in receiving-end system
Function demand can increase significantly, meanwhile, the reactive compensation that shunt capacitor provides starts to reduce, and whole network voltage, which can further deteriorate, to be led
Cause transient voltage unstability.Fast quick-recovery of the dc power after fault in ac transmission system excision helps to alleviate the power of AC system
Imbalance, but too fast power recovery may cause AC system transient voltage unstability.For more feed-in ac and dc systems, this
One feature is more obvious.In more feed-in AC and DC power systems, direct current system transmission capacity is big, drop point is intensive, alternating current-direct current system
When interaction between system and between direct current subsystem is very strong, due to idle after inverter side AC system is by large disturbances
It is low that increase in demand continues AC network major part node voltage, is easy to cause the continuous commutation failure of multiple-circuit line,
It can cause system transient modelling collapse of voltage when serious.
In ac and dc systems, the intensity of receiving end AC system is generally measured using short-circuit ratio index, short-circuit ratio is bigger,
Receiving end AC system is stronger, is less susceptible to that Voltage Instability accident occurs.Judging more feed-in ac and dc systems both at home and abroad at present
Using in terms of voltage stability is most widely more feed-in short circuit ratio methods, but in some cases, with more feed-in short-circuit ratioes
Index judges the voltage stability Shortcomings of more feed-in ac and dc systems.
Therefore, it is necessary to the methods that one kind can accurately determine the voltage stability of more feed-in AC systems.
Summary of the invention
A kind of method that the present invention proposes voltage stability for determining more feed-in ac and dc systems, how to accurately determine
The problem of voltage stability of more feed-in AC systems.
To solve the above-mentioned problems, according to an aspect of the invention, there is provided a kind of more feed-in ac and dc systems of determination
Voltage stability method, which is characterized in that the described method includes:
It determines the DC loop sum of more feed-in ac and dc systems, and calculates more feed-in short-circuit ratioes of each DC loop；
Calculate separately more feed-in interaction factors between any two DC loop；
Calculate separately critical more feed-in interaction factors between any two DC loop；
More feed-in short-circuit ratioes, more feed-in interaction factors and critical more feed-in interaction factors are sentenced with default
Rule of judgment in disconnected rule compares, and determines the voltage stability of more feed-in ac and dc systems.
Preferably, wherein calculating more feed-in short-circuit ratioes in each circuit using following formula:
Wherein, ZeqijFor the equivalent nodal impedance matrix Z to enter in terms of each DC converter buseqThe i-th row, j column element；
PdNiFor the nominal transmission power of i-th time direct current；PdNjFor the nominal transmission power of DC loop j (j=1,2 ..., m)；M is straight
Flow back to road sum.
Preferably, wherein calculating more feed-in interaction factors between any two DC loop using following formula:
Wherein: MIIFjiMore feed-in interaction factors between DC loop are returned for i-th time DC loop and jth；ZeqjiFor
The equivalent nodal impedance matrix Z to enter in terms of each DC converter buseqJth row, the i-th column element and direct current system j inversion
The mutual impedance of side change of current bus and direct current system i inverter side change of current bus；ZeqiiFor equivalent nodal impedance matrix ZeqThe i-th row,
The self-impedance of i-th column element and direct current system i inverter side change of current bus；J >=1, i >=1.
Preferably, wherein using as under type calculate any two DC loop between critical more feed-in reciprocations because
Son:
Wherein: CMIIFjiCritical more feed-in interaction factors between DC loop are returned for i-th time DC loop and jth；
XKj% is the short-circuit reactance percentage that converter power transformer in the Inverter Station of DC loop is returned with direct current system jth；γminValve is intrinsic
Limit blow-out angle；αjFor the delayed trigger angle of the Inverter Station；IdjAnd IdjNRespectively direct current system jth returns the inverse of DC loop
Become the running current and specified running current of side change of current bus；ULj0The inverter side change of current for returning DC loop for direct current system jth is female
The line voltage of line；ULjNFor the rated value of the line voltage；ULi0The inverter side change of current bus of DC loop is returned for direct current system i-th
Line voltage；ULiNFor the rated value of the line voltage.
Preferably, wherein the default judgment rule includes:
If more feed-in short-circuit ratioes are greater than the first preset threshold and more feed-in interaction factors are less than described
Critical more feed-in interaction factors, it is determined that the voltage stability of more feed-in ac and dc systems is advanced, more feedbacks
Entering ac and dc systems is high stability system；
If more feed-in short-circuit ratioes are greater than the first preset threshold and more feed-in interaction factors are more than or equal to
Critical more feed-in interaction factors or more feed-in short-circuit ratioes are less than the first preset threshold and default greater than second
Threshold value, it is determined that the voltage stability of more feed-in ac and dc systems is middle rank, and more feed-in ac and dc systems are medium
Constancy system；
If more feed-in short-circuit ratioes are less than the second preset threshold, it is determined that the voltage of more feed-in ac and dc systems is steady
It is qualitative to be rudimentary, more feed-in ac and dc systems are low constancy system.
Preferably, wherein first preset threshold is 3, second preset threshold is 2.
According to another aspect of the present invention, provide a kind of voltage stability for determining more feed-in ac and dc systems is
System, which is characterized in that the system comprises:
More feed-in short-circuit ratio computing units for determining the DC loop sum of more feed-in ac and dc systems, and calculate every
More feed-in short-circuit ratioes of a DC loop；
More feed-in interaction factor computing units, for calculating separately the interaction of more feed-ins between any two DC loop
Acting factor；
Critical more feed-in interaction factor computing units are critical more between any two DC loop for calculating separately
Feed-in interaction factor；
Voltage stability determination unit, for by more feed-in short-circuit ratioes, more feed-in interaction factors and critical more
Feed-in interaction factor is compared with the Rule of judgment in default judgment rule, determines more feed-in ac and dc systems
Voltage stability.
Preferably, wherein calculating more feedbacks in each circuit using following formula in more feed-in short-circuit ratio computing units
Enter short-circuit ratio:
Wherein, ZeqijFor the equivalent nodal impedance matrix Z to enter in terms of each DC converter buseqThe i-th row, j column element；
PdNiFor the nominal transmission power of i-th time direct current；PdNjFor the nominal transmission power of DC loop j (j=1,2 ..., m)；M is straight
Flow back to road sum.
Preferably, wherein in more feed-in interaction factor computing units, any two are calculated using following formula
More feed-in interaction factors between DC loop:
Wherein: MIIFjiMore feed-in interaction factors between DC loop are returned for i-th time DC loop and jth；ZeqjiFor
The equivalent nodal impedance matrix Z to enter in terms of each DC converter buseqJth row, the i-th column element and direct current system j inversion
The mutual impedance of side change of current bus and direct current system i inverter side change of current bus；ZeqiiFor equivalent nodal impedance matrix ZeqThe i-th row,
The self-impedance of i-th column element and direct current system i inverter side change of current bus；J >=1, i >=1.
Preferably, it wherein in critical more feed-in interaction factor computing units, is calculated using such as under type any
Critical more feed-in interaction factors between two DC loops:
Wherein: CMIIFjiCritical more feed-in interaction factors between DC loop are returned for i-th time DC loop and jth；
XKj% is the short-circuit reactance percentage that converter power transformer in the Inverter Station of DC loop is returned with direct current system jth；γminValve is intrinsic
Limit blow-out angle；αjFor the delayed trigger angle of the Inverter Station；IdjAnd IdjNRespectively direct current system jth returns the inverse of DC loop
Become the running current and specified running current of side change of current bus；ULj0The inverter side change of current for returning DC loop for direct current system jth is female
The line voltage of line；ULjNFor the rated value of the line voltage；ULi0The inverter side change of current bus of DC loop is returned for direct current system i-th
Line voltage；ULiNFor the rated value of the line voltage.
Preferably, wherein the default judgment rule includes:
If more feed-in short-circuit ratioes are greater than the first preset threshold and more feed-in interaction factors are less than described
Critical more feed-in interaction factors, it is determined that the voltage stability of more feed-in ac and dc systems is advanced, more feedbacks
Entering ac and dc systems is high stability system；
If more feed-in short-circuit ratioes are greater than the first preset threshold and more feed-in interaction factors are more than or equal to
Critical more feed-in interaction factors or more feed-in short-circuit ratioes are less than the first preset threshold and default greater than second
Threshold value, it is determined that the voltage stability of more feed-in ac and dc systems is middle rank, and more feed-in ac and dc systems are medium
Constancy system；
If more feed-in short-circuit ratioes are less than the second preset threshold, it is determined that the voltage of more feed-in ac and dc systems is steady
It is qualitative to be rudimentary, more feed-in ac and dc systems are low constancy system.
Preferably, wherein first preset threshold is 3, second preset threshold is 2.
The present invention provides a kind of method and system of voltage stability for determining more feed-in ac and dc systems, comprising: really
The DC loop sum of fixed more feed-in ac and dc systems, and calculate more feed-in short-circuit ratioes of each DC loop；It calculates separately and appoints
The more feed-in interaction factors anticipated between two DC loops；The critical more feed-ins calculated separately between any two DC loop are handed over
The interaction factor；By more feed-in short-circuit ratioes, more feed-in interaction factors and critical more feed-in interaction factors and in advance
If the Rule of judgment in judgment rule compares, the voltage stability of more feed-in ac and dc systems is determined.The present invention mentions
The method that the more feed-in short-circuit ratioes of joint and more feed-in interaction factors determine voltage stability is gone out, it is contemplated that more feed-in interactions
The influence of acting factor compensates for when more feed-in short-circuit ratio indexs judge the voltage stability of more feed-in ac and dc systems not
Foot, can be applied to ac and dc systems planning, design and operation etc. fields, it is simple and efficient, for instruct bulk power grid planning and
The safe and stable operation of maintenance bulk power grid is of great significance.
Detailed description of the invention
By reference to the following drawings, exemplary embodiments of the present invention can be more fully understood by:
Fig. 1 is the method 100 according to the voltage stability of the more feed-in ac and dc systems of determination of embodiment of the present invention
Flow chart；
Fig. 2 is the equivalent circuit diagram according to two feed-in ac and dc systems of embodiment of the present invention；
Fig. 3 is the system 300 according to the voltage stability of the more feed-in ac and dc systems of determination of embodiment of the present invention
Structural schematic diagram.
Specific embodiment
Exemplary embodiments of the present invention are introduced referring now to the drawings, however, the present invention can use many different shapes
Formula is implemented, and is not limited to the embodiment described herein, and to provide these embodiments be at large and fully disclose
The present invention, and the scope of the present invention is sufficiently conveyed to person of ordinary skill in the field.Show for what is be illustrated in the accompanying drawings
Term in example property embodiment is not limitation of the invention.In the accompanying drawings, identical cells/elements use identical attached
Icon note.
Unless otherwise indicated, term (including scientific and technical terminology) used herein has person of ordinary skill in the field
It is common to understand meaning.Further it will be understood that with the term that usually used dictionary limits, should be understood as and its
The context of related fields has consistent meaning, and is not construed as Utopian or too formal meaning.
Fig. 1 is the method 100 according to the voltage stability of the more feed-in ac and dc systems of determination of embodiment of the present invention
Flow chart.As shown in Figure 1, the method for the voltage stability for the more feed-in ac and dc systems of determination that embodiments of the present invention provide
It proposes and combines the method that more feed-in short-circuit ratioes and more feed-in interaction factors determine voltage stability, it is contemplated that more feed-ins are handed over
The influence of the interaction factor compensates for when more feed-in short-circuit ratio indexs judge the voltage stability of more feed-in ac and dc systems not
Foot, can be applied to ac and dc systems planning, design and operation etc. fields, it is simple and efficient, for instruct bulk power grid planning and
The safe and stable operation of maintenance bulk power grid is of great significance.Determination more feed-in alternating current-direct currents system that embodiments of the present invention provide
The method of the voltage stability of system determines that the DC loop of more feed-in ac and dc systems is total since step 101 place, in step 101
Number, and calculate more feed-in short-circuit ratioes of each DC loop.
Preferably, wherein calculating more feed-in short-circuit ratioes in each circuit using following formula:
Wherein, ZeqijFor the equivalent nodal impedance matrix Z to enter in terms of each DC converter buseqThe i-th row, j column element；
PdNiFor the nominal transmission power of i-th time direct current；PdNjFor the nominal transmission power of DC loop j (j=1,2 ..., m)；M is straight
Flow back to road sum.
Preferably, more feed-in interaction factors between step 102 calculates separately any two DC loop.
Preferably, wherein calculating more feed-in interaction factors between any two DC loop using following formula:
Wherein: MIIFjiMore feed-in interaction factors between DC loop are returned for i-th time DC loop and jth；ZeqjiFor
The equivalent nodal impedance matrix Z to enter in terms of each DC converter buseqJth row, the i-th column element and direct current system j inversion
The mutual impedance of side change of current bus and direct current system i inverter side change of current bus；ZeqiiFor equivalent nodal impedance matrix ZeqThe i-th row,
The self-impedance of i-th column element and direct current system i inverter side change of current bus；J >=1, i >=1.
Preferably, critical more feed-in interaction factors between step 103 calculates separately any two DC loop.
Preferably, wherein using as under type calculate any two DC loop between critical more feed-in reciprocations because
Son:
Wherein: CMIIFjiCritical more feed-in interaction factors between DC loop are returned for i-th time DC loop and jth；
XKj% is the short-circuit reactance percentage that converter power transformer in the Inverter Station of DC loop is returned with direct current system jth；γminValve is intrinsic
Limit blow-out angle；αjFor the delayed trigger angle of the Inverter Station；IdjAnd IdjNRespectively direct current system jth returns the inverse of DC loop
Become the running current and specified running current of side change of current bus；ULj0The inverter side change of current for returning DC loop for direct current system jth is female
The line voltage of line；ULjNFor the rated value of the line voltage；ULi0The inverter side change of current bus of DC loop is returned for direct current system i-th
Line voltage；ULiNFor the rated value of the line voltage.
Preferably, in step 104 that more feed-in short-circuit ratioes, more feed-in interaction factors and critical more feed-ins is interactive
Acting factor is compared with the Rule of judgment in default judgment rule, determines the voltage stabilization of more feed-in ac and dc systems
Property.
Preferably, wherein the default judgment rule includes:
If more feed-in short-circuit ratioes are greater than the first preset threshold and more feed-in interaction factors are less than described
Critical more feed-in interaction factors, it is determined that the voltage stability of more feed-in ac and dc systems is advanced, more feedbacks
Entering ac and dc systems is high stability system；
If more feed-in short-circuit ratioes are greater than the first preset threshold and more feed-in interaction factors are more than or equal to
Critical more feed-in interaction factors or more feed-in short-circuit ratioes are less than the first preset threshold and default greater than second
Threshold value, it is determined that the voltage stability of more feed-in ac and dc systems is middle rank, and more feed-in ac and dc systems are medium
Constancy system；
If more feed-in short-circuit ratioes are less than the second preset threshold, it is determined that the voltage of more feed-in ac and dc systems is steady
It is qualitative to be rudimentary, more feed-in ac and dc systems are low constancy system.
Preferably, wherein first preset threshold is 3, second preset threshold is 2.
The embodiment illustrated the present invention in detail below
Fig. 2 is the equivalent circuit diagram according to two feed-in ac and dc systems of embodiment of the present invention.As shown in Fig. 2, direct current
System inverter side is connected to adjacent ipsilateral, and inverter side change of current bus is connected by a backcrossing Flow Line, and rectification side is mutually indepedent.
The parameter of twice direct current systems is completely the same, and main control mode is power limitation control, and rectification side uses constant current control, inverter side
Using determining gamma kick.Receiving end AC system model is using the E " for considering time transient processq、E″d6 ranks of potential change generate electricity
The synthetic load mould of machine model, linear AC network (ignoring all resistance) and 40% induction conductivity 60% constant-impedance in parallel
Type.
Voltage stability is determined using the more feed-in short-circuit ratioes of joint provided by the invention and more feed-in interaction factors
Steps are as follows:
Step1: the DC loop sum for determining more feed-in ac and dc systems is 2, then calculates separately two feed-in and hands over directly
More feed-in short-circuit ratioes of streaming system are as follows:
Step2: more feed-in interaction factors between twice direct currents are calculated are as follows:
Step3: critical more feed-in interaction factors between twice direct currents are calculated are as follows:
Step4: it by more feed-in short-circuit ratioes, more feed-in interaction factors and critical more feed-in interaction factors and presets
Rule of judgment in judgment rule compares, and determines the voltage stability of the two feed-ins ac and dc systems.Wherein, due to
MISCR1> 3&MIIF21≥CMIIF21, MISCR2> 3&MIIF12≥CMIIF12, therefore, can determine the two feed-ins alternating current-direct current
The voltage stability of system is second level, which is moderate strength system.
Fig. 3 is the system 300 according to the voltage stability of the more feed-in ac and dc systems of determination of embodiment of the present invention
Structural schematic diagram.As shown in figure 3, embodiments of the present invention provide the voltage stability for determining more feed-in ac and dc systems
System 300, comprising: more feed-in short-circuit ratio computing units 301, more feed-in interaction factor computing units 302, critical more feed-ins
Interaction factor computing unit 303 and voltage stability determination unit 304.
Preferably, more feed-in short-circuit ratio computing units 301, for determining the DC loop of more feed-in ac and dc systems
Sum, and calculate more feed-in short-circuit ratioes of each DC loop.
Preferably, wherein calculating the more of each circuit using following formula in more feed-in short-circuit ratio computing units 301
Feed-in short-circuit ratio:
Wherein, ZeqijFor the equivalent nodal impedance matrix Z to enter in terms of each DC converter buseqThe i-th row, j column element；
PdNiFor the nominal transmission power of i-th time direct current；PdNjFor the nominal transmission power of DC loop j (j=1,2 ..., m)；M is straight
Flow back to road sum.
Preferably, more feed-in interaction factor computing units 302, for calculating separately any two DC loop
Between more feed-in interaction factors.
Preferably, wherein in more feed-in interaction factor computing units 302, any two are calculated using following formula
More feed-in interaction factors between a DC loop:
Wherein: MIIFjiMore feed-in interaction factors between DC loop are returned for i-th time DC loop and jth；ZeqjiFor
The equivalent nodal impedance matrix Z to enter in terms of each DC converter buseqJth row, the i-th column element and direct current system j inversion
The mutual impedance of side change of current bus and direct current system i inverter side change of current bus；ZeqiiFor equivalent nodal impedance matrix ZeqThe i-th row,
The self-impedance of i-th column element and direct current system i inverter side change of current bus；J >=1, i >=1.
Preferably, critical more feed-in interaction factor computing units 303, for calculating separately any two direct current
Critical more feed-in interaction factors between circuit.
Preferably, it wherein in critical more feed-in interaction factor computing units 303, is calculated and is appointed using such as under type
The critical more feed-in interaction factors anticipated between two DC loops:
Wherein: CMIIFjiCritical more feed-in interaction factors between DC loop are returned for i-th time DC loop and jth；
XKj% is the short-circuit reactance percentage that converter power transformer in the Inverter Station of DC loop is returned with direct current system jth；γminValve is intrinsic
Limit blow-out angle；αjFor the delayed trigger angle of the Inverter Station；IdjAnd IdjNRespectively direct current system jth returns the inverse of DC loop
Become the running current and specified running current of side change of current bus；ULj0The inverter side change of current for returning DC loop for direct current system jth is female
The line voltage of line；ULjNFor the rated value of the line voltage；ULi0The inverter side change of current bus of DC loop is returned for direct current system i-th
Line voltage；ULiNFor the rated value of the line voltage.
Preferably, the voltage stability determination unit 304, for making more feed-in short-circuit ratioes, more feed-ins interaction
It is compared with the factor and critical more feed-in interaction factors with the Rule of judgment in default judgment rule, determines more feedbacks
Enter the voltage stability of ac and dc systems.
Preferably, if wherein the default judgment rule includes: that more feed-in short-circuit ratioes are greater than the first preset threshold simultaneously
And more feed-in interaction factors are less than critical more feed-in interaction factors, it is determined that more feed-in alternating current-direct currents
The voltage stability of system be it is advanced, more feed-in ac and dc systems be high stability system；If more feed-in short-circuit ratioes
Greater than the first preset threshold and more feed-in interaction factors are more than or equal to critical more feed-in interaction factors,
Or more feed-in short-circuit ratioes less than the first preset threshold and are greater than the second preset threshold, it is determined that more feed-in alternating current-direct currents
The voltage stability of system is middle rank, and more feed-in ac and dc systems are intermediate stability system；If more feed-in short circuits
Than less than the second preset threshold, it is determined that the voltage stability of more feed-in ac and dc systems is rudimentary, more feed-ins friendships
Direct current system is low constancy system.Preferably, wherein first preset threshold is 3, second preset threshold is 2.
The system 300 of the voltage stability of the more feed-in ac and dc systems of the determination of the embodiment of the present invention with it is of the invention another
The method 100 of the voltage stability of the more feed-in ac and dc systems of the determination of one embodiment is corresponding, and details are not described herein.
The present invention is described by reference to a small amount of embodiment.However, it is known in those skilled in the art, as
Defined by subsidiary Patent right requirement, in addition to the present invention other embodiments disclosed above equally fall in it is of the invention
In range.
Normally, all terms used in the claims are all solved according to them in the common meaning of technical field
It releases, unless in addition clearly being defined wherein.All references " one/described/be somebody's turn to do [device, component etc.] " are all opened ground
At least one example being construed in described device, component etc., unless otherwise expressly specified.Any method disclosed herein
Step need not all be run with disclosed accurate sequence, unless explicitly stated otherwise.
Claims (12)
1. a kind of method for the voltage stability for determining more feed-in ac and dc systems, which is characterized in that the described method includes:
It determines the DC loop sum of more feed-in ac and dc systems, and calculates more feed-in short-circuit ratioes of each DC loop；
Calculate separately more feed-in interaction factors between any two DC loop；
Calculate separately critical more feed-in interaction factors between any two DC loop；
By more feed-in short-circuit ratioes, more feed-in interaction factors and critical more feed-in interaction factors and default judgement rule
Rule of judgment in then compares, and determines the voltage stability of more feed-in ac and dc systems.
2. the method according to claim 1, wherein calculating more feed-ins short circuit in each circuit using following formula
Than:
Wherein, ZeqijFor the equivalent nodal impedance matrix Z to enter in terms of each DC converter buseqThe i-th row, j column element；PdNi
For the nominal transmission power of i-th time direct current；PdNjFor the nominal transmission power of DC loop j (j=1,2 ..., m)；M returns for direct current
Road sum.
3. the method according to claim 1, wherein using between following formula calculating any two DC loop
More feed-in interaction factors:
Wherein: MIIFjiMore feed-in interaction factors between DC loop are returned for i-th time DC loop and jth；ZeqjiFor from each
The equivalent nodal impedance matrix Z that DC converter bus is seen intoeqJth row, the i-th column element and direct current system j inverter side change
Flow the mutual impedance of bus and direct current system i inverter side change of current bus；ZeqiiFor equivalent nodal impedance matrix ZeqThe i-th row, i-th column
The self-impedance of element and direct current system i inverter side change of current bus；J >=1, i >=1.
4. the method according to claim 1, wherein using as between under type calculating any two DC loop
Critical more feed-in interaction factors:
Wherein: CMIIFjiCritical more feed-in interaction factors between DC loop are returned for i-th time DC loop and jth；XKj%
The short-circuit reactance percentage of converter power transformer in Inverter Station to return DC loop with direct current system jth；γminThe intrinsic limit of valve
Blow-out angle；αjFor the delayed trigger angle of the Inverter Station；IdjAnd IdjNThe respectively inverter side of direct current system jth time DC loop
The running current of change of current bus and specified running current；ULj0The inverter side change of current bus of DC loop is returned for direct current system jth
Line voltage；ULjNFor the rated value of the line voltage；ULi0The line of the inverter side change of current bus of DC loop is returned for direct current system i-th
Voltage；ULiNFor the rated value of the line voltage.
5. the method according to claim 1, wherein the default judgment rule includes:
If more feed-in short-circuit ratioes are greater than the first preset threshold and more feed-in interaction factors are less than described critical
More feed-in interaction factors, it is determined that the voltage stability of more feed-in ac and dc systems is advanced, more feed-ins friendships
Direct current system is high stability system；
If more feed-in short-circuit ratioes are greater than the first preset threshold and more feed-in interaction factors are more than or equal to described
Critical more feed-in interaction factors or more feed-in short-circuit ratioes less than the first preset threshold and are greater than the second default threshold
Value, it is determined that the voltage stability of more feed-in ac and dc systems is middle rank, and more feed-in ac and dc systems are medium steady
Qualitative systems；
If more feed-in short-circuit ratioes are less than the second preset threshold, it is determined that the voltage stability of more feed-in ac and dc systems
To be rudimentary, more feed-in ac and dc systems are low constancy system.
6. according to the method described in claim 5, it is characterized in that, first preset threshold be 3, second preset threshold
It is 2.
7. a kind of system for the voltage stability for determining more feed-in ac and dc systems, which is characterized in that the system comprises:
More feed-in short-circuit ratio computing units for determining the DC loop sum of more feed-in ac and dc systems, and calculate each straight
Flow back to more feed-in short-circuit ratioes on road；
More feed-in interaction factor computing units, for calculating separately more feed-in reciprocations between any two DC loop
The factor；
Critical more feed-in interaction factor computing units, for calculating separately critical more feed-ins between any two DC loop
Interaction factor；
Voltage stability determination unit is used for more feed-in short-circuit ratioes, more feed-in interaction factors and critical more feed-ins
Interaction factor is compared with the Rule of judgment in default judgment rule, determines the voltage of more feed-in ac and dc systems
Stability.
8. system according to claim 7, which is characterized in that in more feed-in short-circuit ratio computing units, using as follows
Formula calculates more feed-in short-circuit ratioes in each circuit:
Wherein, ZeqijFor the equivalent nodal impedance matrix Z to enter in terms of each DC converter buseqThe i-th row, j column element；PdNi
For the nominal transmission power of i-th time direct current；PdNjFor the nominal transmission power of DC loop j (j=1,2 ..., m)；M returns for direct current
Road sum.
9. system according to claim 7, which is characterized in that in more feed-in interaction factor computing units, benefit
More feed-in interaction factors between any two DC loop are calculated with following formula:
Wherein: MIIFjiMore feed-in interaction factors between DC loop are returned for i-th time DC loop and jth；ZeqjiFor from each
The equivalent nodal impedance matrix Z that DC converter bus is seen intoeqJth row, the i-th column element and direct current system j inverter side change
Flow the mutual impedance of bus and direct current system i inverter side change of current bus；ZeqiiFor equivalent nodal impedance matrix ZeqThe i-th row, i-th column
The self-impedance of element and direct current system i inverter side change of current bus；J >=1, i >=1.
10. system according to claim 7, which is characterized in that calculated in critical more feed-in interaction factors single
Member calculates critical more feed-in interaction factors between any two DC loop using such as under type:
Wherein: CMIIFjiCritical more feed-in interaction factors between DC loop are returned for i-th time DC loop and jth；XKj%
The short-circuit reactance percentage of converter power transformer in Inverter Station to return DC loop with direct current system jth；γminThe intrinsic limit of valve
Blow-out angle；αjFor the delayed trigger angle of the Inverter Station；IdjAnd IdjNThe respectively inverter side of direct current system jth time DC loop
The running current of change of current bus and specified running current；ULj0The inverter side change of current bus of DC loop is returned for direct current system jth
Line voltage；ULjNFor the rated value of the line voltage；ULi0The line of the inverter side change of current bus of DC loop is returned for direct current system i-th
Voltage；ULiNFor the rated value of the line voltage.
11. system according to claim 7, which is characterized in that the default judgment rule includes:
If more feed-in short-circuit ratioes are greater than the first preset threshold and more feed-in interaction factors are less than described critical
More feed-in interaction factors, it is determined that the voltage stability of more feed-in ac and dc systems is advanced, more feed-ins friendships
Direct current system is high stability system；
If more feed-in short-circuit ratioes are greater than the first preset threshold and more feed-in interaction factors are more than or equal to described
Critical more feed-in interaction factors or more feed-in short-circuit ratioes less than the first preset threshold and are greater than the second default threshold
Value, it is determined that the voltage stability of more feed-in ac and dc systems is middle rank, and more feed-in ac and dc systems are medium steady
Qualitative systems；
If more feed-in short-circuit ratioes are less than the second preset threshold, it is determined that the voltage stability of more feed-in ac and dc systems
To be rudimentary, more feed-in ac and dc systems are low constancy system.
12. system according to claim 11, which is characterized in that first preset threshold is 3, the second default threshold
Value is 2.
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