CN107086575A - A kind of generation method for the π type equivalent circuits for considering three-phase imbalance factor - Google Patents
A kind of generation method for the π type equivalent circuits for considering three-phase imbalance factor Download PDFInfo
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- CN107086575A CN107086575A CN201710341905.9A CN201710341905A CN107086575A CN 107086575 A CN107086575 A CN 107086575A CN 201710341905 A CN201710341905 A CN 201710341905A CN 107086575 A CN107086575 A CN 107086575A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/04—Circuit arrangements for ac mains or ac distribution networks for connecting networks of the same frequency but supplied from different sources
- H02J3/06—Controlling transfer of power between connected networks; Controlling sharing of load between connected networks
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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
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
Abstract
The present invention relates to a kind of generation method for the π type equivalent circuits for considering three-phase imbalance factor, belong to electroporation field.This method performs following steps：Step S1, sets up three-phase equivalent-circuit model；Step S2, derives AC three-phase current and AC three-phase voltage, DC voltage relational expression；Step S3, derives DC side electric current and AC three-phase voltage, DC voltage relational expression；Step S4, sets up the relational expression of DC current and AC DC transverter alternating current-direct currents side voltage；Step S5, the known variables that will be replaced with the amount in the obtained relational expression in step S4 in traditional equivalent impedance circuit model obtain the AC DC transverter π type equivalent circuits of described consideration three-phase imbalance factor.The present invention greatly facilitates transverter is equivalent into admittance matrix in Load flow calculation, and AC three-phase separate computations, can realize the trend under three-phase imbalance.
Description
Technical field
The present invention relates to a kind of generation method for the π type equivalent circuits for considering three-phase imbalance factor, belong to electroporation
Field.
Background technology
As distributed power source quickly develops, power network will appear from the state of distributed power source high permeability.In order to more preferable
Ground digests distributed power source, and the problems such as solution AC network off-capacity, direct current supply mode will be greatly developed.Hand over
Direct current mixed power supply system has huge real Research Significance as the transition stage of development.
Different from traditional Load flow calculation, AC/DC network introduces AC-DC current conversion stations.And AC-DC current conversion stations do not have at present
There is a complete power flow algorithm, the way of current main-stream is to distinguish iteration to AC and DC system in current conversion station both sides
Solve, but such way causes the unified model with expression formula of alternating current-direct current trend neither one.The key of problem exists
It is in how to solve that current conversion station is equivalent into a rational equivalent circuit.
In summary, the application is directed to providing the generation method of an equivalent circuit, is the trend meter of AC-DC current conversion stations
Calculate and provide convenient.
The content of the invention
The technical problem to be solved in the present invention is, in view of the shortcomings of the prior art, proposing a kind of consideration three-phase imbalance factor
AC-DC transverter π type equivalent circuits generation method.
The technical scheme that in order to solve the above-mentioned technical problem proposes of the present invention is：A kind of π for considering three-phase imbalance factor
The generation method of type equivalent circuit, it is characterised in that perform following steps：
Step S1, is divided into Loss impedance and preferable transverter by AC-DC transverters, and Loss impedance and preferable transverter pass through
Dummy node is connected, so as to set up three-phase equivalent-circuit model；
Step S2, derives AC three-phase current and AC three-phase voltage, straight according to the three-phase equivalent-circuit model
Flow side voltage relationship expression formula；
Relational expression between AC three-phase current phasor and ac bus three-phase voltage phasor, DC bus-bar voltage
It is as follows：
Step S3, DC side electric current and AC three-phase voltage, DC side are derived according to the three-phase equivalent-circuit model
Voltage relationship expression formula；
Relational expression between DC side electric current and ac bus three-phase voltage phasor, DC bus-bar voltage is as follows：
Formula in step S4, simultaneous S2, S3, sets up the relation of DC current and AC-DC transverter alternating current-direct currents side voltage
Expression formula, simultaneous result is as follows：
Step S5, using the method for equivalencing, is passed being replaced with the amount in the obtained relational expression in step S4
Known variables in system equivalent impedance circuit model, obtain described AC-DC transverter π types of consideration three-phase imbalance factor etc.
It is worth circuit；
For ac bus three-phase voltage phasor；
VjFor DC bus-bar voltage；
For AC three-phase current phasor, the direction of the AC three-phase current is to flow to direct current from AC
Side；
y：Transverter equivalent admittance；
For transverter no-load voltage ratio；
IjiFor DC side electric current, the orientation of the DC side electric current is to flow to AC from DC side；
VjFor DC bus-bar voltage.
The improvement of above-mentioned technical proposal is that the known variables in step 5 include：The branch road of traditional equivalent impedance circuit
Three-phase current, DC current and three-phase voltage, DC voltage.
The improvement of above-mentioned technical proposal is that the derivation in step 2 is as follows：Set up in ac bus and step S1 and introduce
Virtual bus between voltage-current relationship expression formula；According to the shift theory of transverter, the virtual of step S1 introducings is derived
The relational expression of voltage x current between bus and dc bus；The foregoing relational expression of simultaneous draws AC three-phase current phase
Amount and the relational expression between ac bus three-phase voltage phasor, DC bus-bar voltage.
The improvement of above-mentioned technical proposal is that the derivation in step S3 is as follows：It is flat using AC-DC transverters two ends power
The virtual bus and the power balance equation of dc bus introduced in weighing apparatus, establishment step S1；Using in ac bus and step S1
The voltage relationship of the virtual bus introduced, eliminates the virtual busbar voltage that step S1 is introduced in power balance equation, then by altogether
Yoke is converted, and draws the relational expression between DC side electric current and ac bus three-phase voltage phasor, DC bus-bar voltage.
It is of the invention to be using the beneficial effect of above-mentioned technical proposal：1) present invention introduces virtual bus by step S1, empty
The impedance intended between bus and ac bus has with the difference and transverter for reacting ac bus voltage and transverter input voltage
Work(is lost；
2) due in traditional transverter model branch admittance from AC and DC side be seen as different value the problem of, and this hair
The table that bright step S5 is set up using the alternating current-direct current side voltage-current relationship expression formula of transverter conventional model and the method for this patent
Up to formula contrast, the admittance for replacing bad processing in the former solves the problem, to simplify problem encountered in Load flow calculation.
3) conventional model is replaced with the equivalent electricity of the less π types of variable by the method replaced in step S5 of the present invention using equivalence
Branch parameters comprise only transverter no-load voltage ratio T in road model, new modela、Tb、TcWith virtual resistance equivalent reactance.Therefore, greatly
Facilitate transverter is equivalent into admittance matrix in Load flow calculation, and AC three-phase separate computations, three-phase can be realized
Trend under uneven.
Brief description of the drawings
The invention will be further described below in conjunction with the accompanying drawings.
Fig. 1 is the AC-DC in the embodiment of the generation method for the π type equivalent circuits that the present invention considers three-phase imbalance factor
Transverter equivalent model schematic diagram.
Fig. 2 is that the tradition in the embodiment of the generation method for the π type equivalent circuits that the present invention considers three-phase imbalance factor is changed
Flow device circuit model schematic.
Fig. 3 is new changing in the embodiment of the generation method for the π type equivalent circuits that the present invention considers three-phase imbalance factor
Flow device three-phase π type Type Equivalent Circuit Model schematic diagrames.
Embodiment
Embodiment
The generation method of the AC-DC transverter π type equivalent circuits of the consideration three-phase imbalance factor of the present embodiment, is performed such as
Lower step：
Step S1, is divided into Loss impedance and preferable transverter by AC-DC transverters, and Loss impedance and preferable transverter pass through
Dummy node is connected, so as to set up three-phase equivalent-circuit model, as shown in Figure 1；
Step S2, derives AC three-phase current and AC three-phase voltage, straight according to the three-phase equivalent-circuit model
Flow side voltage relationship expression formula；
Relational expression between AC three-phase current phasor and ac bus three-phase voltage phasor, DC bus-bar voltage
It is as follows：
Step S3, DC side electric current and AC three-phase voltage, DC side are derived according to the three-phase equivalent-circuit model
Voltage relationship expression formula；
Relational expression between DC side electric current and ac bus three-phase voltage phasor, DC bus-bar voltage is as follows：
Formula in step S4, simultaneous S2, S3, sets up the relation of DC current and AC-DC transverter alternating current-direct currents side voltage
Expression formula, simultaneous result is as follows：
Step S5, as shown in Figures 2 and 3, using the method for equivalencing, by with the obtained relational expression in step S4
In amount replace known variables in traditional equivalent impedance circuit model, obtain the AC- of described consideration three-phase imbalance factor
DC transverter π type equivalent circuits；
For ac bus three-phase voltage phasor；
VjFor DC bus-bar voltage；
For AC three-phase current phasor, the direction of the AC three-phase current is to flow to direct current from AC
Side；
y：Transverter equivalent admittance；
For transverter no-load voltage ratio；
IjiFor DC side electric current, the orientation of the DC side electric current is to flow to AC from DC side；
VjFor DC bus-bar voltage.
The known variables in the step 5 of the present embodiment include：It is the branch road three-phase current of traditional equivalent impedance circuit, straight
Flow electric current and three-phase voltage, DC voltage.
Derivation in the step 2 of the present embodiment is as follows：Set up the virtual bus introduced in ac bus and step S1
Between voltage-current relationship expression formula；According to the shift theory of transverter, virtual bus and direct current that step S1 is introduced are derived
The relational expression of voltage x current between bus；The foregoing relational expression of simultaneous draws AC three-phase current phasor with exchanging mother
Relational expression between line three-phase voltage phasor, DC bus-bar voltage.
Derivation in the step S3 of the present embodiment is as follows：Utilize AC-DC transverters two ends power-balance, establishment step
The virtual bus and the power balance equation of dc bus introduced in S1；Utilize the virtual mother introduced in ac bus and step S1
The voltage relationship of line, eliminates the virtual busbar voltage that step S1 is introduced in power balance equation, then by conjugater transformation, draws straight
Flow the relational expression between side electric current and ac bus three-phase voltage phasor, DC bus-bar voltage.
The amplitude and phase angle of ac bus three-phase voltage；
The amplitude and phase angle of virtual bus three-phase voltage；
ysa ysb ysc：Exchange side bus three-phase ground admittance；
y1a y1b y1c：From the transverter three-phase admittance in terms of AC；
y2a y2b y2c：From the transverter three-phase admittance in terms of DC side；
ysd：DC side grounding conductance.
The present invention is not limited to above-described embodiment.The technical scheme of all use equivalent substitution formation, all falling within the present invention will
The protection domain asked.
Claims (4)
1. a kind of generation method for the π type equivalent circuits for considering three-phase imbalance factor, it is characterised in that perform following steps：
Step S1, is divided into Loss impedance and preferable transverter by AC-DC transverters, and Loss impedance and preferable transverter pass through virtual
Node is connected, so as to set up three-phase equivalent-circuit model；
Step S2, AC three-phase current and AC three-phase voltage, DC side are derived according to the three-phase equivalent-circuit model
Voltage relationship expression formula；
Relational expression between AC three-phase current phasor and ac bus three-phase voltage phasor, DC bus-bar voltage is such as
Under：
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Step S3, DC side electric current and AC three-phase voltage, DC voltage are derived according to the three-phase equivalent-circuit model
Relational expression；
Relational expression between DC side electric current and ac bus three-phase voltage phasor, DC bus-bar voltage is as follows：
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Formula in step S4, simultaneous S2, S3, sets up the relationship expression of DC current and AC-DC transverter alternating current-direct currents side voltage
Formula, simultaneous result is as follows：
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Step S5, using the method for equivalencing, will replace tradition etc. with the amount in the obtained relational expression in step S4
It is worth the known variables in impedance circuit model, obtains the equivalent electricity of AC-DC transverter π types of described consideration three-phase imbalance factor
Road；
For ac bus three-phase voltage phasor；
VjFor DC bus-bar voltage；
For AC three-phase current phasor, the direction of the AC three-phase current is to flow to DC side from AC；
y：Transverter equivalent admittance；
For transverter no-load voltage ratio；
IjiFor DC side electric current, the orientation of the DC side electric current is to flow to AC from DC side；
VjFor DC bus-bar voltage.
2. the generation method of the π type equivalent circuits according to claim 1 for considering three-phase imbalance factor, its feature exists
In the known variables in step 5 include：Branch road three-phase current, DC current and the three-phase electricity of traditional equivalent impedance circuit
Pressure, DC voltage.
3. the generation method of the π type equivalent circuits according to claim 1 for considering three-phase imbalance factor, its feature exists
In the derivation in step 2 is as follows：The voltage x current set up between the virtual bus introduced in ac bus and step S1 is closed
It is expression formula；According to the shift theory of transverter, voltage x current between virtual bus and dc bus that derivation step S1 is introduced
Relational expression；The foregoing relational expression of simultaneous draw AC three-phase current phasor and ac bus three-phase voltage phasor,
Relational expression between DC bus-bar voltage.
4. the generation method of the π type equivalent circuits according to claim 1 for considering three-phase imbalance factor, its feature exists
In the derivation in step S3 is as follows：Using AC-DC transverters two ends power-balance, what is introduced in establishment step S1 is virtual
The power balance equation of bus and dc bus；Using the voltage relationship of the virtual bus introduced in ac bus and step S1,
The virtual busbar voltage that step S1 is introduced in power balance equation is eliminated, then by conjugater transformation, draws DC side electric current and friendship
Flow the relational expression between bus three-phase voltage phasor, DC bus-bar voltage.
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