CN102592003B - Data exchange method for electromechanical and electromagnetic transient hybrid simulation - Google Patents

Abstract

The invention discloses a data exchange method for electromechanical and electromagnetic transient hybrid simulation and relates to the technical field of transient stability research and digital simulation of power systems. The method comprises the following steps of: simulating an electromagnetic transient simulation power grid to obtain the electromagnetic transient simulation data, simulating an electromechanical simulation power grid to obtain the electromechanical simulation data, processing the electromechanical simulation data to obtain a three-phase instantaneous value Thevenin equivalent circuit model of the electromagnetic transient simulation power grid, correcting a power supply frequency and transmitting the parameters of the three-phase instantaneous value Thevenin equivalent circuit model to the electromagnetic transient simulation power grid through an interface bus; and processing the electromagnetic transient simulation data to obtain the active power and the reactive power injected into the electromechanical simulation power grid through the interface bus and form an electromechanical simulation interface bus model, so that the active power and the reactive power can be transmitted to the electromechanical simulation power grid. According to the data exchange method for electromechanical and electromagnetic transient hybrid simulation disclosed by the invention, the real-time simulation of the power grid in a relatively large scale is realized; and the hybrid simulation is not limited by the scale of the power grid.

Description

A kind of for dynamo-electric and method for interchanging data electromagnetic transient hybrid simulation

Technical field

The present invention relates to power system transient stability research and digital simulation technique field, particularly a kind of for dynamo-electric and method for interchanging data electromagnetic transient hybrid simulation.

Background technology

Power system digital simulation, be widely used in Transient Stability Analysis, protective device is adjusted with control and yardman, trains in real time the fields such as emulation.Transient state process of electric power system is very complicated, according to different time scales, can be divided into electromagnetic transient and electromechanical transient process, EMTP(Electromagnetic Transient Program is adopted in the research of these two kinds of processes usually, electromagnetic transient simulation) and TSP(Transient Simulation Program, electromechanical transient simulation) two kinds of methods.

The instantaneous value response of the electric current and voltage during EMTP calculating electrical network is dynamic, simulation step length less (usually adopting Microsecond grade step-length (h), for example 50 μ s).The process of waving of the dynamically middle generator's power and angle of TSP analytic system and busbar voltage, simulation step length is large (adopting Millisecond step-length (H), for example 2ms) usually, thereby can carry out real-time simulation to fairly large electrical network.

The inventor in realizing process of the present invention, finds in prior art to exist at least following shortcoming and defect:

1, EMTP emulation need to be described the mathematical model of element dynamic behaviour in network in detail, thereby is difficult to larger electrical network is carried out real-time simulation;

2,, along with the development of Power Electronic Technique and high voltage dc transmission technology, often need to consider the Electromagnetic Dynamic process of these new-type elements to the safety analysis of large electrical network, but TSP emulation can't be carried out this class emulation.

Summary of the invention

The invention provides a kind of for dynamo-electric and method for interchanging data electromagnetic transient hybrid simulation, by this interface method, electromechanical transient simulation and electromagnetic transient simulation are combined and carry out hybrid simulation, realized larger electrical network is carried out real-time simulation, described below:

A kind of for dynamo-electric and method for interchanging data electromagnetic transient hybrid simulation, said method comprising the steps of:

(1) the electrical equipment region is considered as the electromagnetic transient simulation electrical network, described electromagnetic transient simulation electrical network is carried out electromagnetic transient simulation, obtain electromagnetic transient state simulation data, network beyond described electromagnetic transient simulation electrical network is considered as the electromechanical simulation electrical network, described electromechanical simulation electrical network is carried out electromechanical transient simulation, obtain the electromechanical simulation data, the bus between described electromechanical simulation electrical network and described electromagnetic transient simulation electrical network is considered as the interface bus of hybrid simulation;

(2) the described electromechanical simulation data that obtain are processed, obtain the three-phase instantaneous value Dai Weinan Type Equivalent Circuit Model of electromagnetic transient simulation electrical network, supply frequency is revised, the parameter of the three-phase instantaneous value Dai Weinan Type Equivalent Circuit Model of described electromagnetic transient simulation electrical network is passed to described electromagnetic transient simulation electrical network by described interface bus;

(3) the described electromagnetic transient state simulation data that obtains is processed, obtain active-power P and reactive power Q that described interface bus injects the electromagnetic transient simulation electrical network, described active-power P and described reactive power Q that each interface is obtained form the electromechanical simulation Model Transfer to described electromechanical simulation electrical network.

Described described electromechanical simulation data to acquisition in step (2) are processed, obtain the three-phase instantaneous value Dai Weinan Type Equivalent Circuit Model of electromagnetic transient simulation electrical network, supply frequency is revised, the parameter of the three-phase instantaneous value Dai Weinan Type Equivalent Circuit Model of described electromagnetic transient simulation electrical network is comprised by the particular content that described interface bus passes to described electromagnetic transient simulation electrical network:

1) obtain voltage (V under each synchronous generator d-q coordinate system from described electromechanical simulation data _d, V _q), current value (I _d, I _q), network node admittance matrix Y, node voltage

And Injection Current

2) according to described voltage (V _d, V _q) and described current value (I _d, I _q) obtain the equivalent generator admittance Y in the unified circuit model of each generator _GAnd Injection Current And with described equivalent generator admittance Y _GWith described Injection Current

Add in described electromechanical simulation electrical network;

3) according to described network node admittance matrix Y, described node voltage With described Injection Current

, by the Equivalent Network method, obtain the single-phase multiport Dai Weinan phasor equivalent circuit of described electromechanical simulation electrical network;

4) the single-phase multiport Dai Weinan phasor equivalent circuit of described electromechanical simulation electrical network is converted to the three-phase instantaneous value Dai Weinan Type Equivalent Circuit Model of described electromagnetic transient simulation electrical network;

5) supply frequency of the three-phase instantaneous value Dai Weinan Type Equivalent Circuit Model of described electromagnetic transient simulation electrical network is revised;

6) parameter of the three-phase instantaneous value Dai Weinan Type Equivalent Circuit Model of described electromagnetic transient simulation electrical network is passed to described electromagnetic transient simulation electrical network by described interface bus.

The supply frequency correction of the described instantaneous value of three-phase to described electromagnetic transient simulation electrical network Dai Weinan Type Equivalent Circuit Model is specially:

$f_j=f_0+\frac{1}{2\mathrm{\π}}\frac{{\mathrm{\θ}}_{j,a}(t+H)-{\mathrm{\θ}}_{j,a}\left(t\right)}{H}$

f _jFor the interface frequency of the equivalent power supply of Dai Weinan of border bus j constantly; f ₀For rated frequency; H is the electromechanical simulation step-length; θ _j,a(t+H) and θ _j,a(t) be respectively t+H and the t phase angle of j interface busbar voltage constantly.

Described unified circuit model is specially:

$(I_x+j{I}_y)={\stackrel{\·}{J}}_G-(U_x+j{U}_y)Y_G$

Wherein, ${\stackrel{\·}{J}}_G=\frac{\stackrel{\‾}{E_d}+j\stackrel{\‾}{E_q}+I_q(\stackrel{\‾}{X_q}-\stackrel{\‾}{X_d})}{(R+j\stackrel{\‾}{X_d})(\sin \mathrm{\δ}+j\cos )};$ $Y_G={(R+j{\stackrel{\‾}{X}}_d)}^{-1},$

With

Represent respectively equivalent electromotive force and the reactance of d axle and q axle; R represents stator resistance.

Described described electromagnetic transient state simulation data to acquisition in step (3) is processed, obtain the active-power P and the reactive power Q that inject the electromagnetic transient simulation electrical network by described interface bus, the described active-power P that each interface is obtained and described reactive power Q form the electromechanical simulation Model Transfer and comprise to the particular content of described electromechanical simulation electrical network:

1) obtain each interface bus three-phase instantaneous value voltage (u from described electromagnetic transient state simulation data _a, u _b, u _c) and the three-phase instantaneous value current vector sequence of injecting described electromagnetic transient simulation electrical network;

2) adopt least square method to ask for corresponding fundamental frequency amplitude and the phase angle of described each three-phase instantaneous value current vector sequence, described fundamental frequency amplitude and described phase angle are converted to the three-phase phasor

With

3) adopt symmetrical component method to described three-phase phasor

With Carry out coordinate transform, extract the node voltage positive-sequence component at described interface bus place

With the electric current positive-sequence component of injecting described electromagnetic transient simulation electrical network

4) according to the node voltage positive-sequence component of described each interface bus

Electric current positive-sequence component with described electromagnetic transient simulation electrical network

Obtain active-power P and reactive power Q that described interface bus injects described electromagnetic transient simulation electrical network;

5) the described active-power P of each interface being obtained and described reactive power Q form the electromechanical simulation model, pass to described electromechanical simulation electrical network.

The beneficial effect of technical scheme provided by the invention is:

The invention provides a kind of for dynamo-electric and method for interchanging data electromagnetic transient hybrid simulation, the present invention processes and transmits by the data of the data to electromechanical transient and electromagnetic transient hybrid simulation, realized the hybrid simulation that electromechanical transient simulation and electromagnetic transient simulation combine, realized larger electrical network is carried out real-time simulation; This hybrid simulation is not subjected to the restriction of electrical network scale, can carry out electromagnetic transient hybrid simulation to the electrical network of hybrid simulation inside, and the electrical network of outside is carried out electromechanical transient simulation, takes into account simultaneously simulation efficiency and internal electric network research electro-magnetic transient result; This hybrid simulation can reflect the rear impact on the electrical power system transient angle stability of being incorporated into the power networks of power electronic equipment and high-voltage direct-current transmission system better, the Electromagnetic Simulation result also can embody the impact that wave at system merit angle conversely, this interface method, have good versatility; And the unified circuit model of synchronous generator provided by the invention has been expanded the range of application of simulation model; After employing considers that the three-phase instantaneous value Dai Weinan Type Equivalent Circuit Model of the electromagnetic transient simulation electrical network of frequency shift (FS) can correctly reflect system generation disturbance, the physical process that generator amature and each border busbar voltage, frequency are waved; The present invention extracts voltage, electric current fundamental component with least square technology and symmetrical component method, can carry out hybrid simulation to asymmetric fault.

Description of drawings

Fig. 1 is the schematic diagram of the unified circuit model of synchronous generator provided by the invention;

Fig. 2 is the schematic diagram of hybrid simulation exchanges data flow process provided by the invention;

Fig. 3 is the wiring diagram that contains 3 machine 9 computation of many nodes systems of transformer station provided by the invention;

Fig. 4 is the schematic diagram of EMTP simulation circuit model provided by the invention;

Fig. 5 is the schematic diagram of TSP simulation circuit model provided by the invention;

Fig. 6 is the schematic diagram of comparing curve of B1-B three-phase current hybrid simulation result and PSCAD the whole network Electromagnetic Simulation;

Fig. 7 is the process flow diagram of a kind of method for interchanging data for dynamo-electric and electromagnetic transient hybrid simulation provided by the invention.

Embodiment

For making the purpose, technical solutions and advantages of the present invention clearer, embodiment of the present invention is described further in detail below in conjunction with accompanying drawing.

For electromechanical transient simulation and electromagnetic transient simulation are combined and carry out hybrid simulation, it is a kind of for dynamo-electric and method for interchanging data electromagnetic transient hybrid simulation that the embodiment of the present invention provides, referring to Fig. 2 and Fig. 7, described below:

101: the electrical equipment region is considered as the electromagnetic transient simulation electrical network, the electromagnetic transient simulation electrical network is carried out electromagnetic transient simulation, obtain electromagnetic transient state simulation data, network beyond the electromagnetic transient simulation electrical network is considered as the electromechanical simulation electrical network, the electromechanical simulation electrical network is carried out electromechanical transient simulation, obtain the electromechanical simulation data, the bus between electromechanical simulation electrical network and electromagnetic transient simulation electrical network is considered as the interface bus of hybrid simulation;

102: the electromechanical simulation data that obtain are processed, obtain the three-phase instantaneous value Dai Weinan Type Equivalent Circuit Model of electromagnetic transient simulation electrical network, supply frequency is revised, the parameter of the three-phase instantaneous value Dai Weinan Type Equivalent Circuit Model of electromagnetic transient simulation electrical network is passed to the electromagnetic transient simulation electrical network by the interface bus;

Wherein, this step specifically comprises:

1) obtain voltage (V under each synchronous generator d-q coordinate system from dynamo-electric emulated data _d, V _q), current value (I _d, I _q), network node admittance matrix Y, node voltage And Injection Current

Wherein, the d axle represents the d-axis of synchronous generator, and the q axle represents the quadrature axis of synchronous generator.

2) according to voltage (V _d, V _q) and current value (I _d, I _q) obtain the equivalent generator admittance Y in the unified circuit model of each generator _GAnd Injection Current

And with equivalent generator admittance Y _GAnd Injection Current

Add in the electromechanical simulation electrical network;

Wherein, the unified circuit model in the embodiment of the present invention adopts model shown in Figure 1.For different types of generator, its unified stator voltage equation under the d-q coordinate system can be expressed as:

$\left[\begin{array}{c}{U}_d\\ U_q\end{array}\right]=\left[\begin{array}{c}\stackrel{\‾}{E_d}\\ \stackrel{\‾}{E_q}\end{array}\right]-\left[\begin{array}{cc}R& -\stackrel{\‾}{X_d}\\ \stackrel{\‾}{X_d}& R\end{array}\right]\left[\begin{array}{c}{I}_d\\ I_q\end{array}\right]---\left(1\right)$

In formula, U _d, U _q, I _dAnd I _qRepresent respectively the voltage and current of synchronous motor d axle and q axle;

With Represent respectively equivalence (transient state or inferior transient state) electromotive force and the reactance of d axle and q axle; R represents stator resistance.

The embodiment of the present invention is connected synchronous motor by the coordinate transformation equation shown in formula (2) with the electromechanical simulation electrical network, wherein, δ is generator's power and angle, U _x+ jU _yAnd I _x+ jI _yBe respectively set end voltage and the electric current phasor of generator under system x-y coordinate system, implication is seen Fig. 1.

$\left\{\begin{array}{c}{U}_d+j{U}_q=(U_x+j{U}_y)(\sin \mathrm{\δ}+j\cos \mathrm{\δ})\\ I_d+j{I}_q=(I_x+j{I}_y)(\sin \mathrm{\δ}+j\cos \mathrm{\δ})\end{array}\right.---\left(2\right)$

With formula (2) substitution formula (1), derive the model of synchronous generator under the x-y coordinate system, as follows:

$(I_x+j{I}_y)={\stackrel{\·}{J}}_G-(U_x+j{U}_y)Y_G---\left(3\right)$

In formula: ${\stackrel{\·}{J}}_G=\frac{\stackrel{\‾}{E_d}+j\stackrel{\‾}{E_q}+I_q(\stackrel{\‾}{X_q}-\stackrel{\‾}{X_d})}{(R+j\stackrel{\‾}{X_d})(\sin \mathrm{\δ}+j\cos \mathrm{\δ})};$ $Y_G={(R+j\stackrel{\‾}{X_d})}^{-1}$

After the TSP subsystem carried out a step emulation, the hybrid simulation assembly received the synchronous generator machine data and calculates the parameter of synchronous generator circuit model according to formula (3), and added in the network node admittance matrix and Injection Current data that assembly receives.

3) according to network node admittance matrix Y, node voltage

And Injection Current

, by the Equivalent Network method, obtain the single-phase multiport Dai Weinan phasor equivalent circuit of electromechanical simulation electrical network;

4) the single-phase multiport Dai Weinan phasor equivalent circuit of electromechanical simulation electrical network is converted to the three-phase instantaneous value Dai Weinan Type Equivalent Circuit Model of electromagnetic transient simulation electrical network;

Because each border busbar voltage frequency in Electrical Power System Dynamic can be waved near ratings, thereby to revise the supply frequency of the three-phase instantaneous value Dai Weinan Type Equivalent Circuit Model of electromagnetic transient simulation electrical network.

5) supply frequency of the three-phase instantaneous value Dai Weinan Type Equivalent Circuit Model of electromagnetic transient simulation electrical network is revised;

Wherein, this step is specially: according to formula (4), supply frequency is revised,

$f_i=f_0+\frac{1}{2\mathrm{\π}}\frac{{\mathrm{\θ}}_{j,a}(t+H)-{\mathrm{\θ}}_{j,a}\left(t\right)}{H}---\left(4\right)$

f _jFor the interface frequency of the equivalent power supply of Dai Weinan of border bus j constantly; f ₀For rated frequency; H is the electromechanical simulation step-length; θ _j,a(t+H) and θ _j,a(t) be respectively t+H and the t phase angle of j interface busbar voltage constantly.

6) parameter of the three-phase instantaneous value Dai Weinan Type Equivalent Circuit Model of electromagnetic transient simulation electrical network is passed to the electromagnetic transient simulation electrical network by the interface bus.

Wherein, parameter specifically comprises: voltage magnitude, phase angle, revised supply frequency and impedance etc.

103: the electromagnetic transient state simulation data that obtains is processed, obtain the active-power P and the reactive power Q that inject the electromagnetic transient simulation electrical network by the interface bus, active-power P and reactive power Q that each interface is obtained form the electromechanical simulation Model Transfer to the electromechanical simulation electrical network.

Wherein, this step specifically comprises:

1) obtain each interface bus three-phase instantaneous value voltage (u from electromagnetic transient state simulation data _a, u _b, u _c) and the three-phase instantaneous value current vector sequence of injecting the electromagnetic transient simulation electrical network;

2) adopt least square method to ask for corresponding fundamental frequency amplitude and the phase angle of each three-phase instantaneous value current vector sequence, fundamental frequency amplitude and phase angle are converted to the three-phase phasor

With

In period, electromagnetic transient state simulation data is that corresponding step-length is one group of discrete time signal y (t of h at an electromechanical simulation step-length H _i).Usually, y (t) can represent with following Fourier series:

$y\left(t\right)=\frac{1}{2}{a}_0+\underset{n=1}{\overset{\∞}{\mathrm{\Σ}}}(a_n\cos \mathrm{n\ωt}+b_n\sin \mathrm{n\ωt})---\left(5\right)$

The embodiment of the present invention adopts the Least Square in Processing electromagnetic transient state simulation data to obtain interface bus place electric current and voltage discrete signal, solves corresponding fundamental voltage electric current phasor.For the characteristics of electric system actual motion, formula (5) is carried out abbreviation, cast out higher hamonic wave, keep DC component, fundamental frequency and harmonic, thereby obtain formula (6).

According to triangle formula, following formula is launched:

y(t)=C ₁F ₁(t)+C ₂F ₂(t) (7)

In formula:

F ₁=cos ω t, F ₂=sin ω t.C wherein ₁And C ₂For amount to be asked, F ₁And F ₂For known sequential phasor.

Utilize least square method to set up following error function.

$E=\underset{i=1}{\overset{n}{\mathrm{\Σ}}}{\{y\left(t_i\right)-C_1{F}_1\left(t_i\right)-C_2{F}_2\left(t_i\right)\}}^2---\left(8\right)$

Wherein, y (t _i) represent that the electromagnetic transient simulation electrical network passes to instantaneous three-phase voltage and the electric current of the interface bus of hybrid simulation assembly.

E=[[Y]-[F][C]] ^T[[Y]-[F][C]] (9)

Wherein: [Y]=[y (t ₁), y (t ₂) ..., y (t _n)] ^T

[C]=[C ₁,C ₂] ^T。

To the following formula differentiate, and make it equal zero, can solve unknown quantity C, and then can extract amplitude A1 and the phase angle of fundamental frequency cosine function , by said method, just can obtain the fundamental phasors of the electric current and voltage at interface bus place

With

3) adopt symmetrical component method to the three-phase phasor With

Carry out coordinate transform, extract the node voltage positive-sequence component at interface bus place

With the electric current positive-sequence component of injecting the electromagnetic transient simulation electrical network

4) according to the node voltage positive-sequence component of each interface bus Electric current positive-sequence component with the electromagnetic transient simulation electrical network Obtain active-power P and reactive power Q that the interface bus injects the electromagnetic transient simulation electrical network;

5) active-power P of each interface being obtained and reactive power Q form the electromechanical simulation model, pass to the electromechanical simulation electrical network.

This step is specially: the constant duty that the active-power P that each interface is obtained and reactive power Q are considered as interface bus TSP emulation, i.e. electromechanical simulation model, referring to Fig. 5, for example: P ₁+ jQ ₁And P ₂+ jQ ₂

Verify the feasibility of a kind of method for interchanging data for dynamo-electric and electromagnetic transient hybrid simulation that the embodiment of the present invention provides below in conjunction with an example, described below:

The embodiment of the present invention is modified on 3 machine 9 node experimental systems, increase a Simulation Substation, wherein comprises two station power distribution transformers and 4 circuits, as shown in Figure 3.Transformer station's external network (electromechanical simulation electrical network) carries out electromechanical transient simulation, and its generator is selected twin shaft time transient Model; Transformer station's internal network (electromagnetic transient simulation electrical network) adopts electromagnetic transient simulation; B1 and B2 bus are the interface bus.The TSP simulation step length is 0.02s, and the EMTP simulation step length is 50us, is set in BL2 bus place single-phase earthing fault occurs, and fault was since 1.5 seconds, and fault disappeared in 1.7 seconds.Whole experimental system is carried out the whole network trend calculate, solve the initial information of each state variable in system, pass to respectively TSP emulation and EMTP emulation., in order to guarantee the stability of system interface, at 0.5 second, constantly two systems are connected in actual emulation.The embodiment of the present invention describes as example the control step of system emulation take 1.0 seconds to 1.02 seconds hybrid simulation interface modules.

Step 1: at first 1. module receive dynamo-electric emulated data at the data message of 1.0 seconds and process;

In the embodiment of the present invention, hybrid simulation contains two interfaces, and emulation will form the three-phase instantaneous value Dai Weinan Type Equivalent Circuit Model of 2 corresponding port electromagnetic transient simulation electrical networks, and as shown in Figure 4, corresponding data message is as shown in table 1.

The data message list that table 1 electromechanical simulation electrical network transmitted to the electromagnetic transient simulation electrical network at 1.0 seconds

Step 2: the electromechanical simulation electrical network passes to the electromagnetic transient simulation electrical network with table 1 parameter information by the interface bus;

Step 3: the electromagnetic transient simulation electrical network carries out Electromagnetic Simulation H second (annotating H is the step-length of TSP emulation); After the three-phase voltage current Wave data of electromagnetic transient simulation electrical network EMTP emulation gained is processed, extract corresponding voltage, the positive-sequence component of electric current, and further obtain each interface active-power P and reactive power Q and form the electromechanical simulation model as shown in Figure 5, the power data information that the electromechanical simulation electrical network is accepted is as shown in table 2.

The data message that table 2 electromagnetic transient simulation electrical network transmitted to the electromechanical simulation electrical network in 1.0+H second

Step 4: the electromagnetic transient simulation electrical network passes to the electromechanical simulation electrical network with table 2 parameter information and carries out a step electromechanical transient simulation.

Carry out hybrid simulation to till 3 seconds emulation concluding times according to above-mentioned steps.Figure 6 shows that the three-phase current of circuit B1-B, wherein solid line is the hybrid simulation result, and dotted line is the result of business software PSCAD the whole network Electromagnetic Simulation, the better match of more visible two curves, the accurate and effective that shows the hybrid simulation method for interchanging data, verified the feasibility of the embodiment of the present invention.

In sum, it is a kind of for dynamo-electric and method for interchanging data electromagnetic transient hybrid simulation that the embodiment of the present invention provides, the embodiment of the present invention is processed and is transmitted by the data of the data to electromechanical transient and electromagnetic transient hybrid simulation, realized the hybrid simulation that electromechanical transient simulation and electromagnetic transient simulation combine, realized larger electrical network is carried out real-time simulation; This hybrid simulation is not subjected to the restriction of electrical network scale, can carry out electromagnetic transient hybrid simulation to the electrical network of hybrid simulation inside, and the electrical network of outside is carried out electromechanical transient simulation, takes into account simultaneously simulation efficiency and internal electric network research electro-magnetic transient result; This hybrid simulation can reflect the rear impact on the electrical power system transient angle stability of being incorporated into the power networks of power electronic equipment and high-voltage direct-current transmission system better, the Electromagnetic Simulation result also can embody the impact that wave at system merit angle conversely, this interface method, have good versatility; And the unified circuit model of the synchronous generator that the embodiment of the present invention provides has been expanded the range of application of simulation model; After adopting the electromagnetic transient simulation circuit model of considering frequency shift (FS) can correctly reflect system generation disturbance, the physical process that generator amature and each border busbar voltage, frequency are waved; The embodiment of the present invention is extracted voltage, electric current fundamental component with least square technology and symmetrical component method, can carry out hybrid simulation to asymmetric fault.

It will be appreciated by those skilled in the art that accompanying drawing is the schematic diagram of a preferred embodiment, the invention described above embodiment sequence number, just to describing, does not represent the quality of embodiment.

The foregoing is only preferred embodiment of the present invention, in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.

Claims (1)

1. one kind is used for method for interchanging data dynamo-electric and electromagnetic transient hybrid simulation, it is characterized in that, said method comprising the steps of:

(1) the electrical equipment region is considered as the electromagnetic transient simulation electrical network, described electromagnetic transient simulation electrical network is carried out electromagnetic transient simulation, obtain electromagnetic transient state simulation data, network beyond described electromagnetic transient simulation electrical network is considered as the electromechanical simulation electrical network, described electromechanical simulation electrical network is carried out electromechanical transient simulation, obtain the electromechanical simulation data, the bus between described electromechanical simulation electrical network and described electromagnetic transient simulation electrical network is considered as the interface bus of hybrid simulation;

(2) the described electromechanical simulation data that obtain are processed, obtain the three-phase instantaneous value Dai Weinan Type Equivalent Circuit Model of electromagnetic transient simulation electrical network, supply frequency is revised, the parameter of the three-phase instantaneous value Dai Weinan Type Equivalent Circuit Model of described electromagnetic transient simulation electrical network is passed to described electromagnetic transient simulation electrical network by described interface bus;

(3) the described electromagnetic transient state simulation data that obtains is processed, obtain active-power P and reactive power Q that described interface bus injects the electromagnetic transient simulation electrical network, described active-power P and described reactive power Q that each interface is obtained form the electromechanical simulation Model Transfer to described electromechanical simulation electrical network;

Wherein, the particular content of step (2) comprising:

1) obtain voltage (V under each synchronous generator d-q coordinate system from described electromechanical simulation data _d, V _q), current value (I _d, I _q), network node admittance matrix Y, node voltage And Injection Current

2) according to described voltage (V _d, V _q) and described current value (I _d, I _q) obtain the equivalent generator admittance Y in the unified circuit model of each generator _GAnd Injection Current

, and with described equivalent generator admittance Y _GWith described Injection Current

Add in described electromechanical simulation electrical network;

3) according to described network node admittance matrix Y, described node voltage

With described Injection Current

, by the Equivalent Network method, obtain the single-phase multiport Dai Weinan phasor equivalent circuit of described electromechanical simulation electrical network;

4) the single-phase multiport Dai Weinan phasor equivalent circuit of described electromechanical simulation electrical network is converted to the three-phase instantaneous value Dai Weinan Type Equivalent Circuit Model of described electromagnetic transient simulation electrical network;

5) supply frequency of the three-phase instantaneous value Dai Weinan Type Equivalent Circuit Model of described electromagnetic transient simulation electrical network is revised;

Wherein, correction is specially:

$f_j=f_0+\frac{1}{2\mathrm{\π}}\frac{{\mathrm{\θ}}_{j,a}(t+H)-{\mathrm{\θ}}_{j,a}\left(t\right)}{H}$

f _jFor the interface frequency of the equivalent power supply of Dai Weinan of border bus j constantly; f ₀For rated frequency; H is the electromechanical simulation step-length; θ _j,a(t+H) and θ _j,a(t) be respectively t+H and the t phase angle of j interface busbar voltage constantly; A is a item in three-phase voltage;

Wherein, described unified circuit model is specially:

$(I_x+j{I}_y)={\stackrel{\·}{J}}_G-(U_x+j{U}_y)Y_G$

Wherein, $\stackrel{\·}{J_G}=\frac{\stackrel{\‾}{E_d}+j\stackrel{\‾}{E_q}+I_q(\stackrel{\‾}{X_q}-\stackrel{\‾}{X_d})}{(R+j\stackrel{\‾}{X_d})(\sin \mathrm{\δ}+j\cos \mathrm{\δ})};$ $Y_G={(R+j{\stackrel{\‾}{X}}_d)}^{-1},$

With

Represent respectively equivalent electromotive force and the reactance of d axle and q axle; R represents stator resistance; δ is generator's power and angle, U _x+ jU _yAnd I _x+ jI _yBe respectively set end voltage and the electric current phasor of generator under system x-y coordinate system;

Wherein, step (3) specifically comprises:

1) obtain each interface bus three-phase instantaneous value voltage (u from described electromagnetic transient state simulation data _a, u _b, u _c) and the three-phase instantaneous value current vector sequence of injecting described electromagnetic transient simulation electrical network;

2) adopt least square method to ask for corresponding fundamental frequency amplitude and the phase angle of described each three-phase instantaneous value current vector sequence, described fundamental frequency amplitude and described phase angle are converted to the three-phase phasor

With

3) adopt symmetrical component method to described three-phase phasor

With Carry out coordinate transform, extract the node voltage positive-sequence component at described interface bus place With the electric current positive-sequence component of injecting described electromagnetic transient simulation electrical network

4) according to the node voltage positive-sequence component of described each interface bus

Electric current positive-sequence component with described electromagnetic transient simulation electrical network

Obtain active-power P and reactive power Q that described interface bus injects described electromagnetic transient simulation electrical network.

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