CN110503274A - A kind of appraisal procedure and system of direct current system commutation failure risk - Google Patents
A kind of appraisal procedure and system of direct current system commutation failure risk Download PDFInfo
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- H—ELECTRICITY
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Abstract
The present invention provides the appraisal procedures and system of a kind of direct current system commutation failure risk, comprising: calculates the nodal impedance matrix of the receiving end AC system of the bus of the change of current containing inverter side in ac and dc systems to be studied；AC-DC coupling acting factor is calculated according to the nodal impedance matrix；The risk of commutation failure occurs according to the AC-DC coupling acting factor and pre-set general critical AC-DC coupling acting factor assessment direct current system.Technical solution provided by the invention, the receiving end AC system nodal impedance matrix of the bus of the change of current containing inverter side need to only be established, the value of general critical AC-DC coupling acting factor is given according to the ordinary circumstance of engineering calculation, it avoids large scale emulation and calculates analysis, greatly reduce calculation amount, it is time-consuming short, it is easy to use.
Description
Technical field
The invention belongs to Operation of Electric Systems and planning field, and in particular to a kind of direct current system commutation failure risk is commented
Estimate method and system.
Background technique
With the development of HVDC Transmission Technology and the extensive use of extra-high voltage alternating current-direct current technology, there is multiple-circuit line transmission of electricity
System short distance drop point is in the situation of same AC system, i.e. Multi-infeed HVDC transmission system.Increasing system operation mode
While flexibility and expansion system transmission capacity, multi-feed high voltage direct current also increases the complexity of system structure.And by
Electrical couplings are close between DC inversion station, and the reciprocation between ac and dc systems becomes more complicated.Receiving-end system exchange event
Barrier may cause multiple-circuit line while commutation failure occur, and may cause multiple-circuit line power transmission when AC fault is serious
It interrupts, this brings huge challenge to the safe and stable operation of entire ac and dc systems.
Assessment receiving-end system AC fault causes the conventional method of direct current system commutation failure risk to be by electromechanics at present
Transient emulation program carries out fault scanning calculating, and this method is computationally intensive, and time-consuming.
Summary of the invention
A kind of appraisal procedure of direct current system commutation failure risk provided by the invention, comprising:
A kind of appraisal procedure of direct current system commutation failure risk, comprising:
Calculate the nodal impedance matrix of the receiving end AC system of the bus of the change of current containing inverter side in ac and dc systems to be studied；
AC-DC coupling acting factor is calculated according to the nodal impedance matrix；
According to the AC-DC coupling acting factor and pre-set general critical AC-DC coupling acting factor assessment
The risk of direct current system generation commutation failure.
The calculating of the nodal impedance matrix of the receiving end AC system of the bus of the change of current containing inverter side includes:
Establish the receiving end AC system of the bus of the change of current containing inverter side of ac and dc systems to be studied node referenced to ground
Node admittance matrix；
Nodal impedance matrix is calculated as follows according to the node admittance matrix:
Z=Y-1
In formula, Z is nodal impedance matrix, and Y is node admittance matrix；
The nodal impedance matrix includes: the mutual resistance between direct current system inverter side change of current bus and receiving-end system ac bus
Anti-, the self-impedance of receiving-end system ac bus and direct current system inverter side change of current bus self-impedance.
The AC-DC coupling acting factor is calculated as follows:
Wherein: ADVCFjmFor the combined-voltage between direct current system j inverter side change of current bus and receiving-end system ac bus m
The coupling factor；ZjmFor the mutual impedance of direct current system j inverter side change of current bus and receiving-end system ac bus m；ZmmFor receiving end
The self-impedance of system ac bus m；J >=1, m >=1.
The setting of the general critical AC-DC coupling acting factor, is determined by following formula:
Wherein: CADVCFjmFor the critical alternating current-direct current of direct current system j inverter side change of current bus and receiving-end system ac bus m
The voltage coupling factor, XKj% is the short-circuit reactance percentage with converter power transformer in direct current system j Inverter Station, γminFor valve
Intrinsic limit blow-out angle, αjFor the delayed trigger angle of the Inverter Station；IdjAnd IdjNRespectively direct current system j inversion
The running current and specified running current of side change of current bus；ULj0For receiving-end system ac bus m generation
The line voltage of direct current system j inverter side change of current bus, U before failureLjNFor the rated value of the line voltage；
ULm0Line voltage before breaking down for the receiving-end system ac bus m, ULmNFor the rated value of the line voltage.
The setting of the general critical AC-DC coupling acting factor further include:
Set γmin=7 °, XK% is 15%, ULj0≈ULjN, ULm0≈ULmN, Idj≈IdjN, αjIt 142 °~143 ° of ≈, will
γmin、XK%, ULj0、ULjN、ULm0、ULmN、Idj、IdjNAnd αjValue substitute intoIn, be calculated general critical AC-DC coupling effect because
Son:
In formula: GCADVCFGeneral critical friendship between direct current system inverter side change of current bus and receiving-end system ac bus is straight
Flow the coupling factor.
It is described according to the AC-DC coupling acting factor and pre-set general critical AC-DC coupling acting factor
Assess the risk that commutation failure occurs for direct current system, comprising: it is described logical to judge whether the AC-DC coupling acting factor is less than
If being not less than determine that three-phase metallic short circuit occurs at receiving-end system ac bus with critical AC-DC coupling acting factor
There are the risks of commutation failure for direct current system after failure；If being less than, determine that three-phase metal occurs at receiving-end system ac bus
Property short trouble after direct current system be not present commutation failure risk.
A kind of assessment system of direct current system commutation failure risk provided by the invention, comprising:
First computing module, the receiving end for calculating the bus of the change of current containing inverter side in ac and dc systems to be studied exchange system
The nodal impedance matrix of system；
Second computing module, for calculating AC-DC coupling acting factor according to the nodal impedance matrix；
Evaluation module, for according to the AC-DC coupling acting factor and pre-set general critical AC-DC coupling
Acting factor assesses the risk that commutation failure occurs for direct current system.
First computing module is for establishing changing containing inverter side for ac and dc systems to be studied node referenced to ground
Flow the node admittance matrix of the receiving end AC system of bus；
Nodal impedance matrix is calculated as follows according to the node admittance matrix:
Z=Y-1
In formula, Z is nodal impedance matrix, and Y is node admittance matrix；
The nodal impedance matrix includes: the mutual resistance between direct current system inverter side change of current bus and receiving-end system ac bus
Anti-, the self-impedance of receiving-end system ac bus and direct current system inverter side change of current bus self-impedance.
Second computing module is for being calculated as follows AC-DC coupling acting factor:
Wherein: ADVCFjmFor the combined-voltage between direct current system j inverter side change of current bus and receiving-end system ac bus m
The coupling factor；ZjmFor the mutual impedance of direct current system j inverter side change of current bus and receiving-end system ac bus m；ZmmFor receiving end
The self-impedance of system ac bus m；J >=1, m >=1.
The evaluation module includes setting submodule, for determine according to the following formula general critical AC-DC coupling effect because
Son:
Wherein: CADVCFjmFor the critical alternating current-direct current of direct current system j inverter side change of current bus and receiving-end system ac bus m
The voltage coupling factor, XKj% is the short-circuit reactance percentage with converter power transformer in direct current system j Inverter Station, γminFor valve
Intrinsic limit blow-out angle, αjFor the delayed trigger angle of the Inverter Station；IdjAnd IdjNRespectively direct current system j inversion
The running current and specified running current of side change of current bus；ULj0For receiving-end system ac bus m generation
The line voltage of direct current system j inverter side change of current bus, U before failureLjNFor the rated value of the line voltage；
ULm0Line voltage before breaking down for the receiving-end system ac bus m, ULmNFor the rated value of the line voltage.
The setting submodule is used for γmin=7 °, XK% is taken as 15%, ULj0≈ULjN, ULm0≈ULmN, Idj≈IdjN,
αjIt 142 °~143 ° of ≈, substitutes intoIn, obtain general critical friendship
Dc-couple acting factor:
In formula: GCADVCFGeneral critical friendship between direct current system inverter side change of current bus and receiving-end system ac bus is straight
Flow the coupling factor.
The evaluation module includes Comparative sub-module, for judging it is described whether the AC-DC coupling acting factor is less than
General critical AC-DC coupling acting factor determines that generation three-phase metallicity is short at receiving-end system ac bus if being not less than
There are the risks of commutation failure for direct current system after the failure of road；If being less than, determine that three-phase gold occurs at receiving-end system ac bus
The risk of commutation failure is not present in direct current system after attribute short trouble.
Compared with the latest prior art, technical solution provided by the invention has the advantages that
Technical solution provided by the invention need to only establish the receiving end AC system node impedance square of the bus of the change of current containing inverter side
Battle array, gives the value of general critical AC-DC coupling acting factor according to the ordinary circumstance of engineering calculation, avoids extensive imitative
It is true to calculate analysis, calculation amount is greatly reduced, it is time-consuming short, it is easy to use.
Detailed description of the invention
Fig. 1 is a kind of appraisal procedure flow chart of direct current system commutation failure risk provided by the invention；
Fig. 2 is two feed-ins alternating current-direct current example equivalence system schematic provided in an embodiment of the present invention.
Specific embodiment
The present invention will be further described in detail with reference to the accompanying drawing:
Embodiment one,
Fig. 1 is a kind of appraisal procedure flow chart of direct current system commutation failure risk provided by the invention, as shown in Figure 1,
A kind of appraisal procedure of direct current system commutation failure risk provided by the invention, comprising:
A kind of appraisal procedure of direct current system commutation failure risk, comprising:
Calculate the nodal impedance matrix of the receiving end AC system of the bus of the change of current containing inverter side in ac and dc systems to be studied；
AC-DC coupling acting factor is calculated according to the nodal impedance matrix；
According to the AC-DC coupling acting factor and pre-set general critical AC-DC coupling acting factor assessment
The risk of direct current system generation commutation failure.
The calculating of the nodal impedance matrix of the receiving end AC system of the bus of the change of current containing inverter side includes:
Establish the receiving end AC system of the bus of the change of current containing inverter side of ac and dc systems to be studied node referenced to ground
Node admittance matrix；
Nodal impedance matrix is calculated as follows according to the node admittance matrix:
Z=Y-1
In formula, Z is nodal impedance matrix, and Y is node admittance matrix；
The nodal impedance matrix includes: the mutual resistance between direct current system inverter side change of current bus and receiving-end system ac bus
Anti-, the self-impedance of receiving-end system ac bus and direct current system inverter side change of current bus self-impedance.
The AC-DC coupling acting factor is calculated as follows:
Wherein: ADVCFjmFor the combined-voltage between direct current system j inverter side change of current bus and receiving-end system ac bus m
The coupling factor；ZjmFor the mutual impedance of direct current system j inverter side change of current bus and receiving-end system ac bus m；ZmmFor receiving end
The self-impedance of system ac bus m；J >=1, m >=1.
The setting of the general critical AC-DC coupling acting factor, is determined by following formula:
Wherein: CADVCFjmFor the critical alternating current-direct current of direct current system j inverter side change of current bus and receiving-end system ac bus m
The voltage coupling factor, XKj% is the short-circuit reactance percentage with converter power transformer in direct current system j Inverter Station, γminFor valve
Intrinsic limit blow-out angle, αjFor the delayed trigger angle of the Inverter Station；IdjAnd IdjNRespectively direct current system j inversion
The running current and specified running current of side change of current bus；ULj0For receiving-end system ac bus m generation
The line voltage of direct current system j inverter side change of current bus, U before failureLjNFor the rated value of the line voltage；
ULm0Line voltage before breaking down for the receiving-end system ac bus m, ULmNFor the rated value of the line voltage.
The setting of the general critical AC-DC coupling acting factor further include:
Set γmin=7 °, XK% is 15%, ULj0≈ULjN, ULm0≈ULmN, Idj≈IdjN, αjIt 142 °~143 ° of ≈, will
γmin、XK%, ULj0、ULjN、ULm0、ULmN、Idj、IdjNAnd αjValue substitute intoIn, be calculated general critical AC-DC coupling effect because
Son:
In formula: GCADVCFGeneral critical friendship between direct current system inverter side change of current bus and receiving-end system ac bus is straight
Flow the coupling factor.
It is described according to the AC-DC coupling acting factor and pre-set general critical AC-DC coupling acting factor
Assess the risk that commutation failure occurs for direct current system, comprising: it is described logical to judge whether the AC-DC coupling acting factor is less than
If being not less than determine that three-phase metallic short circuit occurs at receiving-end system ac bus with critical AC-DC coupling acting factor
There are the risks of commutation failure for direct current system after failure；If being less than, determine that three-phase metal occurs at receiving-end system ac bus
Property short trouble after direct current system be not present commutation failure risk.
Embodiment two,
Based on identical inventive concept, the present invention also provides a kind of assessment system of direct current system commutation failure risk,
May include:
First computing module, the receiving end for calculating the bus of the change of current containing inverter side in ac and dc systems to be studied exchange system
The nodal impedance matrix of system；
Second computing module, for calculating AC-DC coupling acting factor according to the nodal impedance matrix；
Evaluation module, for according to the AC-DC coupling acting factor and pre-set general critical AC-DC coupling
Acting factor assesses the risk that commutation failure occurs for direct current system.
First computing module is for establishing changing containing inverter side for ac and dc systems to be studied node referenced to ground
Flow the node admittance matrix of the receiving end AC system of bus；
Nodal impedance matrix is calculated as follows according to the node admittance matrix:
Z=Y-1
In formula, Z is nodal impedance matrix, and Y is node admittance matrix；
The nodal impedance matrix includes: the mutual resistance between direct current system inverter side change of current bus and receiving-end system ac bus
Anti-, the self-impedance of receiving-end system ac bus and direct current system inverter side change of current bus self-impedance.
Second computing module is for being calculated as follows AC-DC coupling acting factor:
Wherein: ADVCFjmFor the combined-voltage between direct current system j inverter side change of current bus and receiving-end system ac bus m
The coupling factor；ZjmFor the mutual impedance of direct current system j inverter side change of current bus and receiving-end system ac bus m；ZmmFor receiving end
The self-impedance of system ac bus m；J >=1, m >=1.
The evaluation module includes setting submodule, for determine according to the following formula general critical AC-DC coupling effect because
Son:
Wherein: CADVCFjmFor the critical alternating current-direct current of direct current system j inverter side change of current bus and receiving-end system ac bus m
The voltage coupling factor, XKj% is the short-circuit reactance percentage with converter power transformer in direct current system j Inverter Station, γminFor valve
Intrinsic limit blow-out angle, αjFor the delayed trigger angle of the Inverter Station；IdjAnd IdjNRespectively direct current system j inversion
The running current and specified running current of side change of current bus；ULj0For receiving-end system ac bus m generation
The line voltage of direct current system j inverter side change of current bus, U before failureLjNFor the rated value of the line voltage；
ULm0Line voltage before breaking down for the receiving-end system ac bus m, ULmNFor the rated value of the line voltage.
The setting submodule is used for γmin=7 °, XK% is taken as 15%, ULj0≈ULjN, ULm0≈ULmN, Idj≈IdjN,
αjIt 142 °~143 ° of ≈, substitutes intoIn, obtain general critical friendship
Dc-couple acting factor:
In formula: GCADVCFGeneral critical friendship between direct current system inverter side change of current bus and receiving-end system ac bus is straight
Flow the coupling factor.
The evaluation module includes Comparative sub-module, for judging it is described whether the AC-DC coupling acting factor is less than
General critical AC-DC coupling acting factor determines that generation three-phase metallicity is short at receiving-end system ac bus if being not less than
There are the risks of commutation failure for direct current system after the failure of road；If being less than, determine that three-phase gold occurs at receiving-end system ac bus
The risk of commutation failure is not present in direct current system after attribute short trouble.
Embodiment three,
With a two feed-in alternating current-direct current example systems, the present invention is described in further detail below, and two feed-in is handed over
The equal valve systems of direct current example system are as shown in Fig. 2, inverter side change of current bus 1 and 2 is connected by a backcrossing Flow Line, receiving end friendship
Streaming system model is indicated with system equivalent potential source series transformer and double back alternating current circuit.
Twice DC transmission system inverter sides of the two feed-ins alternating current-direct current example system are connected to adjacent ipsilateral, rectification
Side is mutually indepedent, and sending is infinite large-sized unit.
Direct current system commutation failure methods of risk assessment, rapid evaluation receiving-end system ac bus hair are provided using the present invention
Raw three-phase metallic short circuit failure causes direct current system that the risk of commutation failure occurs, and steps are as follows:
Step 1: determining ac and dc systems to be studied as shown in Fig. 2, z according to fig. 21、z2、zAAnd zB, establish to
The node admittance matrix of the receiving end AC system of the bus of the change of current containing inverter side of the ac and dc systems of research node referenced to ground:
Then calculate node impedance matrix according to the following formula:
Z=Y-1
Acquire the receiving end AC system nodal impedance matrix Z of the bus of the change of current containing inverter side (bus 1 and bus 2):
Step 2: being determined first by Z mutual between 1 inverter side change of current bus of direct current system and receiving-end system ac bus A
Impedance Z1A=0.007813, the self-impedance Z of receiving-end system ac bus AAA=0.007813.Then it is calculated according to formula (1)
It is to the AC-DC coupling acting factor between 1 inverter side change of current bus of direct current system and receiving-end system ac bus A
The alternating current-direct current between 2 inverter side change of current bus of direct current system and receiving-end system ac bus A is obtained according to the method described above
Voltage coupling factors A DVCF2A=0.22, the friendship between 1 inverter side change of current bus of direct current system and receiving-end system ac bus B
DC voltage coupling factors A DVCF1B=0.22, between 2 inverter side change of current bus of direct current system and receiving-end system ac bus B
Combined-voltage coupling factors A DVCF2B=1.
Step 3: the general critical AC-DC coupling between direct current system inverter side change of current bus and receiving-end system ac bus
Acting factor:
Step 4: due to ADVCF1A> GCADVCF, ADVCF2A< GCADVCF, it is believed that occur at receiving-end system ac bus A
After three-phase metallic short circuit failure, there are the risk of commutation failure, direct current systems 2, and the wind of commutation failure is not present for direct current system 1
Danger.
Similarly, ADVCF1B< GCADVCF, ADVCF2B> GCADVCF, it is believed that three-phase gold occurs at receiving-end system ac bus B
After attribute short trouble, the risk of commutation failure is not present in direct current system 1, and there are the risks of commutation failure for direct current system 2.
It should be understood by those skilled in the art that, embodiments herein can provide as method, system or computer program
Product.Therefore, complete hardware embodiment, complete software embodiment or reality combining software and hardware aspects can be used in the application
Apply the form of example.Moreover, it wherein includes the computer of computer usable program code that the application, which can be used in one or more,
The computer program implemented in usable storage medium (including but not limited to magnetic disk storage, CD-ROM, optical memory etc.) produces
The form of product.
The application is referring to method, the process of equipment (system) and computer program product according to the embodiment of the present application
Figure and/or block diagram describe.It should be understood that every one stream in flowchart and/or the block diagram can be realized by computer program instructions
The combination of process and/or box in journey and/or box and flowchart and/or the block diagram.It can provide these computer programs
Instruct the processor of general purpose computer, special purpose computer, Embedded Processor or other programmable data processing devices to produce
A raw machine, so that being generated by the instruction that computer or the processor of other programmable data processing devices execute for real
The device for the function of being specified in present one or more flows of the flowchart and/or one or more blocks of the block diagram.
These computer program instructions, which may also be stored in, is able to guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works, so that it includes referring to that instruction stored in the computer readable memory, which generates,
Enable the manufacture of device, the command device realize in one box of one or more flows of the flowchart and/or block diagram or
The function of being specified in multiple boxes.
These computer program instructions also can be loaded onto a computer or other programmable data processing device, so that counting
Series of operation steps are executed on calculation machine or other programmable devices to generate computer implemented processing, thus in computer or
The instruction executed on other programmable devices is provided for realizing in one or more flows of the flowchart and/or block diagram one
The step of function of being specified in a box or multiple boxes.
Finally it should be noted that: the above examples are only used to illustrate the technical scheme of the present invention rather than to its protection scope
Limitation, although the application is described in detail referring to above-described embodiment, those of ordinary skill in the art should
Understand: those skilled in the art read the specific embodiment of application can still be carried out after the application various changes, modification or
Person's equivalent replacement, but these changes, modification or equivalent replacement, are applying within pending claims.
Claims (12)
1. a kind of appraisal procedure of direct current system commutation failure risk characterized by comprising
Calculate the nodal impedance matrix of the receiving end AC system of the bus of the change of current containing inverter side in ac and dc systems to be studied；
AC-DC coupling acting factor is calculated according to the nodal impedance matrix；
Direct current is assessed according to the AC-DC coupling acting factor and pre-set general critical AC-DC coupling acting factor
The risk of system generation commutation failure.
2. the appraisal procedure of direct current system commutation failure risk as described in claim 1, which is characterized in that described to contain inverter side
The calculating of the nodal impedance matrix of the receiving end AC system of change of current bus includes:
Establish the section of the receiving end AC system of the bus of the change of current containing inverter side of ac and dc systems to be studied node referenced to ground
Point admittance matrix；
Nodal impedance matrix is calculated as follows according to the node admittance matrix:
Z=Y-1
In formula, Z is nodal impedance matrix, and Y is node admittance matrix；
The nodal impedance matrix include: mutual impedance between direct current system inverter side change of current bus and receiving-end system ac bus,
The self-impedance of receiving-end system ac bus and the self-impedance of direct current system inverter side change of current bus.
3. the appraisal procedure of direct current system commutation failure risk as claimed in claim 2, which is characterized in that the alternating current-direct current coupling
Acting factor is closed to be calculated as follows:
Wherein: ADVCFjmCombined-voltage between direct current system j inverter side change of current bus and receiving-end system ac bus m couples
Acting factor；ZjmFor the mutual impedance of direct current system j inverter side change of current bus and receiving-end system ac bus m；ZmmFor receiving-end system
The self-impedance of ac bus m；J >=1, m >=1.
4. the appraisal procedure of direct current system commutation failure risk as described in claim 1, which is characterized in that described general critical
The setting of AC-DC coupling acting factor, is determined by following formula:
Wherein: CADVCFjmFor the critical combined-voltage coupling of direct current system j inverter side change of current bus and receiving-end system ac bus m
Close acting factor, XKj% is the short-circuit reactance percentage with converter power transformer in direct current system j Inverter Station, γminFor the intrinsic pole of valve
Limit blow-out angle, αjFor the delayed trigger angle of the Inverter Station；IdjAnd IdjNThe respectively direct current system j inverter side change of current
The running current of bus and specified running current；ULj0It is broken down for the receiving-end system ac bus m
The line voltage of preceding direct current system j inverter side change of current bus, ULjNFor the rated value of the line voltage；ULm0For institute
State the line voltage before receiving-end system ac bus m breaks down, ULmNFor the rated value of the line voltage.
5. the appraisal procedure of direct current system commutation failure risk as claimed in claim 4, which is characterized in that described general critical
The setting of AC-DC coupling acting factor further include:
Set γmin=7 °, XK% is 15%, ULj0≈ULjN, ULm0≈ULmN, Idj≈IdjN, αj142 °~143 ° of ≈, by γmin、
XK%, ULj0、ULjN、ULm0、ULmN、Idj、IdjNAnd αjValue substitute intoIn, be calculated general critical AC-DC coupling effect because
Son:
In formula: GCADVCFGeneral critical alternating current-direct current coupling between direct current system inverter side change of current bus and receiving-end system ac bus
Close acting factor.
6. the appraisal procedure of direct current system commutation failure risk as described in claim 1, which is characterized in that described according to
Commutation occurs for AC-DC coupling acting factor and pre-set general critical AC-DC coupling acting factor assessment direct current system
The risk of failure, comprising: judge whether the AC-DC coupling acting factor is less than the general critical AC-DC coupling effect
The factor determines that direct current system presence is changed after three-phase metallic short circuit failure occurs at receiving-end system ac bus if being not less than
The mutually risk of failure；If being less than, determine at receiving-end system ac bus occur three-phase metallic short circuit failure after direct current system
There is no the risks of commutation failure.
7. a kind of assessment system of direct current system commutation failure risk characterized by comprising
First computing module, for calculating the receiving end AC system of the bus of the change of current containing inverter side in ac and dc systems to be studied
Nodal impedance matrix；
Second computing module, for calculating AC-DC coupling acting factor according to the nodal impedance matrix；
Evaluation module, for being acted on according to the AC-DC coupling acting factor and pre-set general critical AC-DC coupling
The factor assesses the risk that commutation failure occurs for direct current system.
8. the assessment system of direct current system commutation failure risk as claimed in claim 7, which is characterized in that described first calculates
Module is used to establish the receiving end AC system of the bus of the change of current containing inverter side of ac and dc systems to be studied node referenced to ground
Node admittance matrix；
Nodal impedance matrix is calculated as follows according to the node admittance matrix:
Z=Y-1
In formula, Z is nodal impedance matrix, and Y is node admittance matrix；
The nodal impedance matrix include: mutual impedance between direct current system inverter side change of current bus and receiving-end system ac bus,
The self-impedance of receiving-end system ac bus and the self-impedance of direct current system inverter side change of current bus.
9. the assessment system of direct current system commutation failure risk as claimed in claim 8, which is characterized in that described second calculates
Module is for being calculated as follows AC-DC coupling acting factor:
Wherein: ADVCFjmCombined-voltage between direct current system j inverter side change of current bus and receiving-end system ac bus m couples
Acting factor；ZjmFor the mutual impedance of direct current system j inverter side change of current bus and receiving-end system ac bus m；ZmmFor receiving-end system
The self-impedance of ac bus m；J >=1, m >=1.
10. the assessment system of direct current system commutation failure risk as claimed in claim 8, which is characterized in that the assessment mould
Block includes setting submodule, for determining general critical AC-DC coupling acting factor according to general critical alternating current-direct current following formula:
Wherein: CADVCFjmFor the critical combined-voltage coupling of direct current system j inverter side change of current bus and receiving-end system ac bus m
Close acting factor, XKj% is the short-circuit reactance percentage with converter power transformer in direct current system j Inverter Station, γminFor the intrinsic pole of valve
Limit blow-out angle, αjFor the delayed trigger angle of the Inverter Station；IdjAnd IdjNThe respectively direct current system j inverter side change of current
The running current of bus and specified running current；ULj0It is broken down for the receiving-end system ac bus m
The line voltage of preceding direct current system j inverter side change of current bus, ULjNFor the rated value of the line voltage；ULm0For institute
State the line voltage before receiving-end system ac bus m breaks down, ULmNFor the rated value of the line voltage.
11. the assessment system of direct current system commutation failure risk as claimed in claim 10, which is characterized in that setting
Module is used for will
γmin=7 °, XK% is taken as 15%, ULj0≈ULjN, ULm0≈ULmN, Idj≈IdjN, αjIt 142 °~143 ° of ≈, substitutes intoIn, obtain general critical AC-DC coupling acting factor:
In formula: GCADVCFGeneral critical alternating current-direct current coupling between direct current system inverter side change of current bus and receiving-end system ac bus
Close acting factor.
12. the assessment system of direct current system commutation failure risk as claimed in claim 7, which is characterized in that the assessment mould
Block includes Comparative sub-module, for judging whether the AC-DC coupling acting factor is less than the general critical AC-DC coupling
Acting factor determines that direct current system is deposited after three-phase metallic short circuit failure occurs at receiving-end system ac bus if being not less than
In the risk of commutation failure；If being less than, determine at receiving-end system ac bus occur three-phase metallic short circuit failure after direct current
The risk of commutation failure is not present in system.
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