CN109711086A - Electromechanical transient simulation analogy method - Google Patents
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Abstract
The present invention relates to transient state analogue technique fields, disclose electromechanical transient simulation analogy method, which includes: to obtain the controlled voltage of inverter exchange side；The controlled voltage decoupling is handled, the positive sequence voltage and negative sequence voltage of the inverter exchange side three-phase voltage are obtained；The positive sequence voltage and negative sequence voltage shift frequency are handled, the three-phase equivalent voltage shift frequency phasor of inverter exchange side is obtained.Compared to traditional modeling method, electromechanical transient simulation analogy method of the invention, arithmetic speed is fast, model accuracy is high.
Description
Technical field
The present invention relates to transient state analogue technique fields, more particularly, to a kind of electromechanical transient simulation analogy method.
Background technique
The current direction of alternating current makees cyclically-varying at any time, when AC electric power systems is in stable state, voltage or electricity
Stream x (t) shows as pure sinusoidal form, and frequency spectrum only contains f0=50Hz power frequency, is expressed as angular frequency0=2 π f0.Work as system
When being disturbed and being in transient state, system voltage amplitude and frequency all can be changed at any time, be the function of time.
During Operation of Electric Systems, since various disturbances can make electric system enter transient state.Transient process is by one
A stable state is to another stable state process experienced.It being capable of continuous and real-time simulation to electromechanical transient simulation simulation
The electromechanical transient phenomenon of electric system can carry out the power equipments such as field regulator, the protective relaying device of electric system
Simulation analysis.
Due to that in simulation analysis process, can generate a large amount of emulation data, not only calculating process is complicated, but also operand
Greatly, arithmetic speed is influenced.Also, during analogue simulation, since work frequency carrier and other frequency informations cannot effectively divide
From can also have an adverse effect to the accuracy of analogue simulation.
Summary of the invention
(1) technical problems to be solved
The present invention provides a kind of electromechanical transient simulation analogy methods, to solve analogue simulation accuracy in the prior art
Technical problem low, arithmetic speed is low.
(2) technical solution
In order to solve the above technical problems, according to an aspect of the present invention, a kind of electromechanical transient simulation analogy method is provided,
Include:
Obtain the controlled voltage of inverter exchange side；
The controlled voltage decoupling is handled, the positive sequence voltage and negative phase-sequence electricity of the inverter exchange side three-phase voltage are obtained
Pressure；
The positive sequence voltage and negative sequence voltage shift frequency are handled, the three-phase equivalent voltage for obtaining inverter exchange side moves
Frequency phasor.
Further, described to handle the controlled voltage decoupling, obtaining the inverter exchange side three-phase voltage just
Sequence voltage and negative sequence voltage specifically include:
The trigonometric function relationship of accumulated phase differential seat angle based on the three-phase voltage and the positive sequence of the decoupling processing are defeated
Modulated signal out establishes functional relation of the positive sequence voltage about the DC voltage of the inverter；
The trigonometric function relationship of accumulated phase differential seat angle based on the three-phase voltage and the negative phase-sequence of the decoupling processing are defeated
Modulated signal out establishes functional relation of the negative sequence voltage about the DC voltage of the inverter.
Further, the positive sequence voltage statement are as follows:
Wherein, α=θ+A=ω0T+ Δ θ (t)+A, Δ θ are the accumulated phase differential seat angle of three-phase alternating voltage, ω0For the change of current
Device exchanges the original state frequency of side, and A is parameter relevant to electrical angle, vdcFor the DC voltage of inverter,With?
Positive sequence for decoupling processing exports modulated signal.
Further, the negative sequence voltage statement are as follows:
Wherein, α=θ+A=ω0T+ Δ θ (t)+A, Δ θ are the accumulated phase differential seat angle of three-phase alternating voltage, ω0For the change of current
Device exchanges the original state frequency of side, and A is parameter relevant to electrical angle, vdcFor the DC voltage of inverter,WithIt is
The negative phase-sequence of decoupling processing exports modulated signal.
Further, described to specifically include the positive sequence voltage and the processing of negative sequence voltage shift frequency:
The positive sequence voltage is transformed to positive sequence complex signal, and to the positive sequence complex signal shift frequency, obtains positive sequence and moves
Frequency phasor；
The negative sequence voltage is transformed to negative phase-sequence complex signal, and to the negative phase-sequence complex signal shift frequency, obtains negative phase-sequence and moves
Frequency phasor.
Further, the positive sequence shift frequency phasor of inverter exchange side three-phase voltage is exchanged into side three with the inverter
The negative phase-sequence shift frequency phasor of phase voltage carries out complex operation, obtains the three-phase equivalent voltage shift frequency phasor of inverter exchange side.
Further, the three-phase equivalent voltage shift frequency phasor of inverter exchange side is arranged to join about primary vector
Several matrix relationships with the secondary vector parameter of the accumulated phase differential seat angle of three-phase alternating voltage, the primary vector parameter are to close
In the positive sequence output modulated signal of the decoupling processing and the vector parameter of negative phase-sequence output modulated signal.
Further, the three-phase equivalent voltage shift frequency phasor statement of inverter exchange side are as follows:
Wherein, vN_RThe real part of the three-phase equivalent voltage shift frequency phasor of side, v are exchanged for inverterN_ISide is exchanged for inverter
Three-phase equivalent voltage shift frequency phasor imaginary part, Tdq→SFFor the accumulated phase differential seat angle about three-phase alternating voltage second to
Parameter is measured,The vector of modulated signal is exported for positive sequence,The vector of modulated signal is exported for negative phase-sequence.
(3) beneficial effect
A kind of electromechanical transient simulation analogy method proposed by the present invention, its advantages are mainly as follows:
Decoupling processing is carried out by the controlled voltage for exchanging side to inverter, then to resulting positive sequence voltage and negative sequence voltage
Shift frequency processing is carried out respectively, acquired three-phase equivalent voltage shift frequency phasor effectively rejects work frequency carrier as control signal,
Retain other frequency informations, it is more acurrate to the analog simulation of electromechanical transient and electro-magnetic transient, and parameter is few, arithmetic speed is faster.
Specific embodiment
With reference to embodiment, the embodiment of the present invention is furthur described in detail.Following embodiment is used for
Illustrate the present invention, but is not intended to limit the scope of the invention.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " installation ", " phase
Even ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected；It can
To be mechanical connection, it is also possible to be electrically connected；It can be directly connected, can also can be indirectly connected through an intermediary
Connection inside two elements.For the ordinary skill in the art, above-mentioned term can be understood at this with concrete condition
Concrete meaning in invention.
The embodiment of the present invention provides a kind of electromechanical transient simulation analogy method, comprising: obtains the controlled of inverter exchange side
Voltage；
The controlled voltage decoupling is handled, the positive sequence voltage and negative phase-sequence electricity of the inverter exchange side three-phase voltage are obtained
Pressure；
The positive sequence voltage and negative sequence voltage shift frequency are handled, the three-phase equivalent voltage for obtaining inverter exchange side moves
Frequency phasor.
Wherein, in inverter exchange side mean value model, a, b phase line controlled voltage are
In formula,Indicate a the and b phase modulated signal of electric power output control system output, UdcDC voltage.
After the controlled voltage for obtaining inverter exchange side, decoupling processing is carried out to controlled voltage, to obtain about controlled electricity
The positive sequence voltage and negative sequence voltage of pressure.It wherein, can be controlled by a phase controlled voltage, the b phase of controlled voltage for three-phase alternating current
Voltage and c phase controlled voltage respectively correspond the positive sequence voltage and negative sequence voltage for obtaining a phase, b phase and c phase.
After the positive sequence voltage and negative sequence voltage for obtaining a phase, b phase and c phase respectively, then just to a phase, b phase and each phase of c phase
Sequence voltage carries out shift frequency processing, and carries out shift frequency processing to the negative sequence voltage of a phase, b phase and each phase of c phase.
The three-phase equivalent voltage shift frequency phasor of the inverter exchange side obtained using after shift frequency is electromechanical by control as input
The start and stop of system can reject the work frequency carrier of inverter exchange side, retain other frequency informations in addition to work frequency carrier.Example
Such as, the three-phase equivalent voltage shift frequency phasor of inverter exchange side is inputted into the control containing switching device IGBT as control signal
In circuit, by the opening and closing state of control switch device IGBT, the power frequency of the 50Hz of inverter exchange side can be rejected
Carrier wave, and retain other frequency informations in addition to 50Hz.
It, can be by being demodulated in work frequency carrier or extracting low-frequency information, using millisecond rank time step when simulating electromechanical transient
Length is emulated, and can be improved calculating speed and model accuracy.Also, also, during analogue simulation, without establishing not
With the phasor equation of order；And during decoupling processing and shift frequency processing, related parameter type is few, can be further
Simplify operation, improves arithmetic speed.
The analogy method can also be used to simulate electro-magnetic transient, in electro-magnetic transient simulation, can reserved high-frequency information, and adopt
It is emulated with delicate rank time step, the electro-magnetic transient changed fastly can be simulated more accurately.
In a specific embodiment, described to handle the controlled voltage decoupling, obtain inverter exchange side
The positive sequence voltage and negative sequence voltage of three-phase voltage specifically include: the triangle letter of the accumulated phase differential seat angle based on the three-phase voltage
Number relationship and the positive sequence of the decoupling processing export modulated signal, establish direct current of the positive sequence voltage about the inverter
The functional relation of pressure；The trigonometric function relationship of accumulated phase differential seat angle based on the three-phase voltage and the decoupling handle negative
Sequence exports modulated signal, establishes functional relation of the negative sequence voltage about the DC voltage of the inverter.In above-mentioned implementation
On the basis of example, the present embodiment illustrates the method for obtaining positive sequence voltage and negative sequence voltage.
Specifically, the decoupling processing of controlled voltage is decoupled controlled voltage preferably using the method for d-q coordinate system decoupling
For a phase positive sequence voltage, a phase negative sequence voltage, b phase positive sequence voltage, b phase negative sequence voltage, c phase positive sequence voltage and c phase negative sequence voltage.
It is illustrated by taking a phase positive sequence voltage and a phase negative sequence voltage as an example.D-q decomposition is carried out to a phase controlled voltage, is used
When d-q decomposition method carries out decoupling processing, to decouple the accumulation phase for handling resulting positive sequence output modulated signal as three-phase voltage
The coefficient of the trigonometric function of position differential seat angle, obtains the first positive sequence relation function, realizes the separation of fundamental wave and other frequency informations, picks
Except power frequency component improves calculating speed or precision with low frequency or high-frequency signal simulation electromechanics or electro-magnetic transient.
Further, by the DC voltage of the first positive sequence relation function and inverter, a phase positive sequence voltage can be obtained.Equally,
When carrying out d-q decomposition to a phase controlled voltage, the accumulation of resulting negative phase-sequence output modulated signal as three-phase voltage is handled to decouple
The coefficient of the trigonometric function of phase angle difference obtains the first negative phase-sequence relation function.Further, by the first negative phase-sequence relation function with change
The DC voltage for flowing device, can obtain a phase negative sequence voltage.
In a specific embodiment, it is adjusted through control system controller, exports positive sequence modulated signalWithJust
Sequence voltage can state are as follows:
Wherein, α=θ+A=ω0T+ Δ θ (t)+A, Δ θ are the accumulated phase differential seat angle of three-phase alternating voltage, ω0For the change of current
Device exchanges the original state frequency of side, and A is parameter relevant to electrical angle, vdcFor the DC voltage of inverter,With?
Positive sequence for decoupling processing exports modulated signal.Wherein, A is parameter relevant to electrical angle, for three phase mains, A 0,2 π/
3 or -2 π/3.
On the basis of the various embodiments described above, the present embodiment is illustrated about the statement after three-phase voltage decoupling.Due to
2 π/3 of carrier phase shift of each phase of three-phase alternating current, for a phase voltage, A=0；For b phase voltage, π/3 A=-2；For c phase
Voltage, π/3 A=2.
Then a phase positive sequence voltage can state are as follows:
B phase positive sequence voltage can state are as follows:
C phase positive sequence voltage can state are as follows:
In above-mentioned formula (1)-(3), θ=ω0T+ Δ θ (t), Δ θ are the accumulated phase differential seat angle of three-phase alternating voltage, ω0
The original state frequency of side, v are exchanged for inverterdcFor the DC voltage of inverter,WithIt is the positive sequence of decoupling processing
Export modulated signal.
In a specific embodiment,
Wherein, α=θ+A=ω0T+ Δ θ (t)+A, Δ θ are the accumulated phase differential seat angle of three-phase alternating voltage, ω0For the change of current
Device exchanges the original state frequency of side, and A is parameter relevant to electrical angle, vdcFor the DC voltage of inverter,WithIt is
The negative phase-sequence of decoupling processing exports modulated signal.
On the basis of the various embodiments described above, the present embodiment is illustrated about the statement after three-phase voltage decoupling.Equally,
Due to 2 π/3 of carrier phase shift of each phase of three-phase alternating current, for a phase voltage, A=0；For b phase voltage, π/3 A=2；For c
Phase voltage, π/3 A=-2.
Then a phase negative sequence voltage can state are as follows:
B phase negative sequence voltage can state are as follows:
C phase negative sequence voltage can state are as follows:
Wherein, in above-mentioned formula (4)-(6), θ=ω0T+ Δ θ (t), Δ θ are the accumulated phase angle of three-phase alternating voltage
Difference, ω0The original state frequency of side, v are exchanged for inverterdcFor the DC voltage of inverter,WithIt is decoupling processing
Negative phase-sequence exports modulated signal.
By the way that a phase voltage, b phase voltage and c phase voltage in three-phase voltage are carried out decoupling processing respectively, can not only simplify
Calculating process improves arithmetic speed, is also convenient for harmonic carcellation and adversely affects to each component of each phase voltage.
In a specific embodiment, described to specifically include the positive sequence voltage and the processing of negative sequence voltage shift frequency: will
The positive sequence voltage is transformed to positive sequence complex signal, and to the positive sequence complex signal shift frequency, obtains positive sequence shift frequency phasor；By institute
It states negative sequence voltage and is transformed to negative phase-sequence complex signal, and to the negative phase-sequence complex signal shift frequency, obtain negative phase-sequence shift frequency phasor.
On the basis of the various embodiments described above, the present embodiment illustrates the method that shift frequency is handled.Controlled voltage is through solving
After coupling processing, acquired positive sequence voltage and negative sequence voltage are subjected to plural numberization respectively.For example, Hilbert transform can be used
The positive sequence voltage of real signal is transformed to the complex signal of plural form by method.After by the processing of positive sequence voltage plural numberization, then carry out
Shift frequency processing, be able to can effective reserved high-frequency information, more accurately accurately to be simulated to electro-magnetic transient.
Wherein, for a phase positive sequence voltage after Hilbert transform, gained positive sequence complex signal is a phase positive sequence parsing voltage
Wherein, θ=ω0T+ Δ θ (t), Δ θ are the accumulated phase differential seat angle of three-phase alternating voltage, ω0For inverter exchange
The original state frequency of side, vdcFor the DC voltage of inverter,WithIt is the positive sequence output modulated signal of decoupling processing.
The operation of voltage shift frequency is parsed after by a phase positive sequence voltage plural number, then to resulting positive sequence.Specifically, shift frequency is transported
It calculates and the mode for introducing parameter preset can be used.For example, by the two sides of formula (7) with multiplied by parameter presetA phase can be obtained
Positive sequence shift frequency phasor.It, can be by positive sequence shift frequency phasor matrixing to be further simplified calculating process.
A phase positive sequence shift frequency phasor can be stated are as follows:
Wherein,Voltage is parsed for positive sequenceReal part,Voltage is parsed for positive sequenceImaginary part,With
It is the positive sequence output modulated signal of decoupling processing, θ=ω0T+ Δ θ (t), Δ θ are the accumulated phase angle of three-phase alternating voltage
Difference, ω0The original state frequency of side, v are exchanged for inverterdcFor the DC voltage of inverter.
Wherein, matrixIt is the accumulated phase angle about three-phase alternating voltage
The matrix parameter of poor Δ θ.
By by after positive sequence voltage plural number, then shift frequency operation is carried out, other institutes can be retained when rejecting fundamental frequency carrier wave
There is frequency information, makes more complete and flexible to electromechanical and electro-magnetic transient characteristic simulation.
In the same way, for b phase positive sequence voltage after Hilbert transform, gained positive sequence complex signal is b phase positive sequence
Parse voltage
B phase positive sequence shift frequency phasor can be stated are as follows:
Wherein,Voltage is parsed for positive sequenceReal part,Voltage is parsed for positive sequenceImaginary part,With
It is the positive sequence output modulated signal of decoupling processing, θ=ω0T+ Δ θ (t), Δ θ are the accumulated phase angle of three-phase alternating voltage
Difference, ω0The original state frequency of side, v are exchanged for inverterdcFor the DC voltage of inverter.
It is the accumulated phase angle about three-phase alternating voltage
Spend the matrix parameter of poor Δ θ.
Equally, for c phase positive sequence voltage after Hilbert transform, gained positive sequence complex signal is c phase positive sequence parsing voltage
C phase positive sequence shift frequency phasor can be stated are as follows:
Wherein,Voltage is parsed for positive sequenceReal part,Voltage is parsed for positive sequenceImaginary part,With
It is the positive sequence output modulated signal of decoupling processing, θ=ω0T+ Δ θ (t), Δ θ are the accumulated phase angle of three-phase alternating voltage
Difference, ω0The original state frequency of side, v are exchanged for inverterdcFor the DC voltage of inverter.It is the accumulated phase differential seat angle Δ θ about three-phase alternating voltage
Matrix parameter.
Using method identical with positive sequence parsing voltage and positive sequence shift frequency phasor, believed by the negative phase-sequence output modulation of decoupling processing
NumberWithThe negative phase-sequence parsing voltage and negative phase-sequence shift frequency phasor of a phase, b phase and c phase can be obtained.
A phase negative phase-sequence parses voltageIt can state are as follows:
A phase negative phase-sequence shift frequency phasor:
Wherein, matrix
Wherein, in above-mentioned formula (13)-(14),Voltage is parsed for positive sequenceReal part,Electricity is parsed for positive sequence
PressureImaginary part,WithIt is the negative phase-sequence output modulated signal of decoupling processing, θ=ω0T+ Δ θ (t), Δ θ are three-phase alternating current
The accumulated phase differential seat angle of voltage, ω0The original state frequency of side, v are exchanged for inverterdcFor the DC voltage of inverter.
B phase negative phase-sequence parses voltageIt can state are as follows:
B phase negative phase-sequence shift frequency phasor:
Wherein, matrix
Wherein, in above-mentioned formula (15)-(16),Voltage is parsed for positive sequenceReal part,Electricity is parsed for positive sequence
PressureImaginary part,WithIt is the negative phase-sequence output modulated signal of decoupling processing, θ=ω0T+ Δ θ (t), Δ θ are three intersections
The accumulated phase differential seat angle of galvanic electricity pressure, ω0The original state frequency of side, v are exchanged for inverterdcFor the DC voltage of inverter.
C phase negative phase-sequence parses voltageIt can state are as follows:
C phase negative phase-sequence shift frequency phasor:
Wherein, matrix
Wherein, in above-mentioned formula (17)-(18),Voltage is parsed for positive sequenceReal part,Electricity is parsed for positive sequence
PressureImaginary part,WithIt is the negative phase-sequence output modulated signal of decoupling processing, θ=ω0T+ Δ θ (t), Δ θ are three intersections
The accumulated phase differential seat angle of galvanic electricity pressure, ω0The original state frequency of side, v are exchanged for inverterdcFor the DC voltage of inverter.
In a specific embodiment, the positive sequence shift frequency phasor of inverter exchange side three-phase voltage is changed with described
The negative phase-sequence shift frequency phasor for flowing device exchange side three-phase voltage carries out complex operation, obtains the three equivalents electricity of inverter exchange side
Press shift frequency phasor.On the basis of the various embodiments described above, the present embodiment illustrates the acquisition of three-phase equivalent voltage shift frequency phasor.
Obtain a phase, b phase with after the positive sequence shift frequency phasor of each phase of c phase and negative phase-sequence shift frequency phasor, by each phase shift frequency phasor
Real and imaginary parts carry out complex operation respectively.Also i.e. by the real part of the positive sequence shift frequency phasor of a phase and the negative phase-sequence shift frequency phasor of a phase
Real part is added, and the imaginary part of the negative phase-sequence shift frequency phasor of the imaginary part and a phase of the positive sequence shift frequency phasor of a phase is added.Using same method
Also the positive sequence shift frequency phasor to b phase and c phase and negative phase-sequence shift frequency phasor carry out operation, and three-phase equivalent voltage shift frequency phase can be obtained
Amount.
Specifically, the real part v of three-phase equivalent voltage shift frequency phasorN_RWith imaginary part vN_IIt can be expressed as follows respectively:
After the positive sequence shift frequency phasor of a phase, b phase and c phase and negative phase-sequence shift frequency phasor are carried out complex operation, it can obtain
The output signal for controlling regulating switch device IGBT is obtained, by the regulation of the output signal, can effectively reject work
Frequency carrier wave without will affect other frequency informations, and then improves the accuracy of transient emulation simulation and comprehensive.
In a specific embodiment, the three-phase equivalent voltage shift frequency phasor of inverter exchange side is arranged to close
In the matrix relationship of primary vector parameter and the secondary vector parameter of the accumulated phase differential seat angle of three-phase alternating voltage, described first
Vector parameter is the vector parameter that modulated signal and negative phase-sequence output modulated signal are exported about the positive sequence of the decoupling processing.Upper
On the basis of stating each embodiment, the present embodiment, which is illustrated, is further simplified method to three-phase equivalent voltage shift frequency phasor.
In the real part v for obtaining three equivalent shift frequency phasorsN_RWith imaginary part vN_IAfterwards, three equivalent shift frequency phasors can further square
Array, statement are as follows:
Wherein, primary vector parameterTo export modulated signal and negative phase-sequence output modulation about positive sequence
The matrix parameter of signal, Tdq→SFFor the secondary vector parameter of the accumulated phase differential seat angle Δ θ about three-phase alternating voltage.
Specifically, secondary vector parameterFor about three-phase alternating voltage
The matrix parameter of accumulated phase differential seat angle Δ θ,
Wherein,Δ θ is the accumulative phase of three-phase alternating voltage
Position differential seat angle.
By three-phase equivalent voltage shift frequency phasor matrixing, arrange for about three-phase alternating voltage accumulated phase differential seat angle and
Positive-negative sequence exports the matrix relationship of modulated signal, can be further simplified calculating process.
Electromechanical transient simulation analogy method of the invention is carried out at decoupling by the controlled voltage for exchanging side to inverter
Reason, then shift frequency processing, acquired three-phase equivalent voltage shift frequency phasor are carried out respectively to resulting positive sequence voltage and negative sequence voltage
As control signal, work frequency carrier is effectively rejected, other frequency informations are retained, it is imitative to the simulation of electromechanical transient and electro-magnetic transient
It is very more acurrate, and parameter is few, arithmetic speed is faster.
Finally, method of the invention is only preferable embodiment, it is not intended to limit the scope of the present invention.It is all
Within the spirit and principles in the present invention, any modification, equivalent replacement, improvement and so on should be included in protection of the invention
Within the scope of.
Claims (8)
1. a kind of electromechanical transient simulation analogy method characterized by comprising
Obtain the controlled voltage of inverter exchange side；
The controlled voltage decoupling is handled, the positive sequence voltage and negative sequence voltage of the inverter exchange side three-phase voltage are obtained；
The positive sequence voltage and negative sequence voltage shift frequency are handled, the three-phase equivalent voltage shift frequency phase of inverter exchange side is obtained
Amount.
2. electromechanical transient simulation analogy method according to claim 1, which is characterized in that described by the controlled voltage solution
Coupling processing, the positive sequence voltage and negative sequence voltage for obtaining the inverter exchange side three-phase voltage specifically include:
The trigonometric function relationship of accumulated phase differential seat angle based on the three-phase voltage and the positive sequence of the decoupling processing are exported and are adjusted
Signal processed establishes functional relation of the positive sequence voltage about the DC voltage of the inverter；
The trigonometric function relationship of accumulated phase differential seat angle based on the three-phase voltage and the negative phase-sequence of the decoupling processing are exported and are adjusted
Signal processed establishes functional relation of the negative sequence voltage about the DC voltage of the inverter.
3. electromechanical transient simulation analogy method according to claim 1, which is characterized in that the positive sequence voltage statement are as follows:
Wherein, α=θ+A=ω0T+ Δ θ (t)+A, Δ θ are the accumulated phase differential seat angle of three-phase alternating voltage, ω0For inverter friendship
The original state frequency of side is flowed, A is parameter relevant to electrical angle, vdcFor the DC voltage of inverter,WithIt is solution
The positive sequence of coupling processing exports modulated signal.
4. electromechanical transient simulation analogy method according to claim 1, which is characterized in that the negative sequence voltage statement are as follows:
Wherein, α=θ+A=ω0T+ Δ θ (t)+A, Δ θ are the accumulated phase differential seat angle of three-phase alternating voltage, ω0For inverter friendship
The original state frequency of side is flowed, A is parameter relevant to electrical angle, vdcFor the DC voltage of inverter,WithIt is solution
The negative phase-sequence of coupling processing exports modulated signal.
5. electromechanical transient simulation analogy method according to claim 1, which is characterized in that it is described by the positive sequence voltage and
The processing of negative sequence voltage shift frequency specifically includes:
The positive sequence voltage is transformed to positive sequence complex signal, and to the positive sequence complex signal shift frequency, obtains positive sequence shift frequency phase
Amount；
The negative sequence voltage is transformed to negative phase-sequence complex signal, and to the negative phase-sequence complex signal shift frequency, obtains negative phase-sequence shift frequency phase
Amount.
6. electromechanical transient simulation analogy method according to claim 5, which is characterized in that the inverter is exchanged side three
The negative phase-sequence shift frequency phasor that the positive sequence shift frequency phasor of phase voltage exchanges side three-phase voltage with the inverter carries out complex operation, obtains
The three-phase equivalent voltage shift frequency phasor of inverter exchange side.
7. electromechanical transient simulation analogy method according to claim 6, which is characterized in that by inverter exchange side
Three-phase equivalent voltage shift frequency phasor arranges as the about the accumulated phase differential seat angle of primary vector parameter and three-phase alternating voltage
The matrix relationship of two vector parameters, the primary vector parameter is the positive sequence output modulated signal about the decoupling processing and bears
The vector parameter of sequence output modulated signal.
8. electromechanical transient simulation analogy method according to claim 7, which is characterized in that the three of inverter exchange side
The statement of equivalent voltage shift frequency phasor are as follows:
Wherein, vN_RThe real part of the three-phase equivalent voltage shift frequency phasor of side, v are exchanged for inverterN_IExchange side for inverter three
The imaginary part of equivalent voltage shift frequency phasor, Tdq→SFJoin for the secondary vector of the accumulated phase differential seat angle about three-phase alternating voltage
Number,The vector of modulated signal is exported for positive sequence,The vector of modulated signal is exported for negative phase-sequence.
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| CN110378020B (en) * | 2019-07-19 | 2020-04-10 | 华北电力大学 | Multi-frequency-band dynamic phasor electromagnetic transient simulation method and system for power grid commutation converter |
| CN113158617A (en) * | 2021-05-17 | 2021-07-23 | 华北电力大学 | Universal decoupling method and system for electromagnetic transient simulation of voltage source type converter |
| CN113158617B (en) * | 2021-05-17 | 2023-11-03 | 华北电力大学 | General decoupling method and system for electromagnetic transient simulation of voltage source type converter |
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