CN107526858B - PSCAD/EMTDC-based simulation platform for electric iron traction power supply system - Google Patents
PSCAD/EMTDC-based simulation platform for electric iron traction power supply system Download PDFInfo
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Abstract
The invention discloses an electrified railway traction power supply system simulation platform based on PSCAD/EMTDC, which comprises a traction network model, an AC-DC-AC electric locomotive model, an AC-DC electric locomotive model, a harmonic wave and negative sequence detection model, wherein the AC-DC-AC electric locomotive model and the AC-DC electric locomotive model are directly connected to the traction network; the implementation steps are that PSCAD/EMTDC traction network and electric locomotive simulation models are established, then different positions of the overhead line system are studied on the same platform, and harmonic waves, negative sequences and three-phase unbalance degrees generated by different types of electric locomotives and different operation working conditions of the locomotives on a traction power supply system are studied. The invention has better operability, optimizes the model structure, is easy to realize, improves the simulation efficiency, determines the load working state according to different vehicle types running in an actual line, and further monitors the harmonic wave, the negative sequence, the three-phase unbalance degree and the like of the electric iron on the traction network.
Description
Technical Field
The invention relates to the field of power system simulation, in particular to establishment of an electric iron traction power supply system simulation platform based on PSCAD/EMTDC.
Background
The traction power supply station takes electricity from a 110kV or 220kV side power grid, is supplied to an electrified railway after being reduced to 27.5kV through a traction transformer, and a locomotive takes electricity from a 27.5kV contact net, so that the traction power supply station is used for locomotive operation and providing power for various electric equipment in the locomotive. The AC-DC-AC locomotive is powered from the traction network, converted into DC by the rectifier and then converted into AC by the inverter to be sent to the three-phase asynchronous motor in the locomotive to drive the locomotive to run. The AC/DC locomotive takes electricity from the traction network, and direct current is directly supplied to the DC motor through the rectifier to drive the locomotive to run.
In order to facilitate the observation of the power quality at the traction network side, it is necessary to establish simulation modeling of the traction network and the two types of electric locomotives, respectively. MATLAB is a commercial mathematical software available from MathWorks, usa, and is a high-level technical computing language and interactive environment for algorithm development, data visualization, data analysis, and numerical computation. Simulink is one of the most important components of MATLAB, and provides an integrated environment for dynamic system modeling, simulation, and comprehensive analysis.
However, the transient simulation of MATLAB has a certain problem that MATLAB is only suitable for the ideal condition, but cannot be used for analyzing other running states which deviate from the ideal condition, so that the simulation result of simulating the electric iron to the electric energy quality of the traction power supply system by adopting the electromagnetic transient program of MATLAB is inaccurate, low in precision and speed, and the simulation has a large difference from the actual state.
PSCAD/EMTDC (Power Systems Computer Aided Design) is electromagnetic transient simulation software widely used in the world, EMTDC is a simulation calculation core thereof, and PSCAD provides a graphical operation interface for EMTDC (Electromagnetic Transients including DC). However, the existing electrified railway traction power supply system built by using PSCAD/EMTDC cannot realize segmented access of the overhead contact system to the locomotive and simulation aiming at combination of multiple types of locomotives and multiple working conditions.
Disclosure of Invention
In view of the above, the invention provides an electric iron traction power supply system simulation platform based on PSCAD/EMTDC software, and the impedance of the length of the contact net is set according to the requirement, so that two locomotives can be increased and decreased in any section in the traction power supply range. The simulation platform can simulate locomotives of different types simultaneously, and both locomotives can work under different working conditions required by researchers, so that the purpose of accurately simulating and analyzing harmonic wave, negative sequence and three-phase unbalance degree of a traction power supply system by electric iron is achieved.
An electric iron traction power supply system simulation platform based on PSCAD/EMTDC, comprising:
the system comprises a traction network model, an alternating-direct-alternating-current electric locomotive model, an alternating-direct-current electric locomotive model and a harmonic wave and negative sequence detection model, wherein the alternating-direct-current electric locomotive model and the alternating-direct-current electric locomotive model are directly connected to the traction network;
the implementation steps are as follows:
step 1): acquiring data and parameters required by simulation:
step 2): establishing a traction network simulation model, wherein the traction network simulation model comprises an alternating-current-direct-current electric locomotive model and an alternating-current-direct-current electric locomotive model;
step 3): establishing a PSCAD/EMTDC mathematical model;
step 4) the method comprises the following steps of; generating a PSCAD/EMTDC model;
step 5): detecting harmonic negative sequence generated by the traction network;
step 6): and generating an electric iron traction power supply system simulation platform of the PSCAD/EMTDC.
Preferably, the step 1): acquiring data and parameters required by simulation: specifically acquiring voltage effective values at two ends of a transformer in a traction network model, and unit impedance of a traction network line; a harmonic D2 locomotive internal AC/DC side control parameter, an AC/DC side control parameter and an asynchronous motor parameter; the control parameters of the alternating current and direct current sides of the inside of the Shaoshan 4-type locomotive and the parameters of the direct current motor.
Preferably, the step 2): establishing a traction network simulation model, which comprises the following steps: voltage grades at two ends of the transformer and unit impedance parameters of the line; the traction network transformer working principle comprises a working mode and a wiring mode, and a harmonious D2 locomotive model is established, and comprises the following steps: an orthogonal side control model and an orthogonal side control model; building a model of a shaoshan 4 locomotive, which comprises the following steps: and (5) controlling the model on the alternating-direct side.
Preferably, the parameters required for establishing the traction network model, the harmonious D2 type locomotive electrical parameters and the shaoshan 4 type locomotive electrical parameters comprise: traction network unit impedance, transformer parameter rating, locomotive internal voltage current rating, frequency and impedance.
Preferably, the step 3): a. the mathematical model of the transformer in the traction network model is as follows:
b. the unit impedance model in the traction network model is:
Z C ＝0.119+j0.752Ω/km
Z F ＝0.204+j0.885Ω/km
Z R ＝0.162+j0.671Ω/km
Z CR ＝0.057+j0.388Ω/km
Z CF ＝0.057+j0.395Ω/km
Z RF ＝0.057+j0.341Ω/km
C’ CF ＝0.000504uF/km
C’ CR ＝0.002057uF/km
C’ FR ＝0.003262uF/km
wherein: z is Z C Is the unit impedance of the positive feeder line, Z F Is the negative feeder unit impedance, Z R Is the unit impedance of the steel rail, Z CR Z is the unit impedance between the positive feeder and the steel rail CF Is the unit impedance between the positive feeder line and the negative feeder line, Z RF Is the unit impedance between the negative feeder line and the steel rail, C' CR Is the unit capacitance between the positive feeder and the steel rail, C' CF Is the unit capacitance between the positive and negative feed lines, C' RF The positive is the unit capacitance between the negative feeder and the rail.
Preferably, the harmonic D2 locomotive module comprises: an intersection-and-intersection-side control model, and an intersection-and-intersection-side control model:
a. the mathematical model of the alternating-direct side control module is:
wherein: a-phase, b-phase and c-phase modulated waves u a 、u b 、u c Mutual difference of phases, u z Is a triangular carrier wave;
b. the coordinate transformation of the orthogonal side control module can equivalent a multivariable, nonlinear and strongly coupled asynchronous motor model to a direct current motor model, wherein the main mathematical model is as follows:
calculation of 3s/2r coordinate transformation
Calculation of slip frequency
Voltage feedforward calculation
The above mentioned: r is R s 、R r -the motor stator and rotor winding resistances respectively; l (L) s 、L r -self-inductance of motor stator and rotor windings respectively; omega s -inverter frequency; sigma-is the leakage inductance of the motor, sigma=1-L 2 m /(L s L r )；L m Is mutual inductance between stator and rotor windings.
Preferably, the shaoshan 4 locomotive module comprises: and (3) an alternating-direct side control model:
magnetic fluxThe method can be determined by the no-load characteristic curve of the traction motor, and the expression of magnetic fluxes in different exciting current intervals is as follows:
the magnitude of the SS4 electric locomotive motor armature current is determined by the level and speed of the traction control system, as follows,
in the case of the I-th bridge, thyristor T 1 、T 2 Sequentially triggering and calculating T 1 、T 2 Is a trigger angle alpha of (2) 1 、α 2 ：
α 1 ＝α 2 +180°
In the case of a II-th bridge, the thyristor T 3 、T 4 Sequentially triggering and calculating T 3 、T 4 Is a trigger angle alpha of (2) 3 、α 4 ：
α 3 ＝α 4 +180°
In the case of a III-stage bridge, the thyristor T 1 、T 2 Triggering again, at this time T 1 、T 2 Is a trigger angle alpha of (2) 1 、α 2 The method comprises the following steps:
α 1 ＝α 2 +180°
in the IV-stage bridge, thyristor T 3 、T 4 Sequentially trigger, T 4 Is a trigger angle alpha of (2) 4 The method comprises the following steps:
the above mentioned: i d -the total current of the direct current traction motor; u (U) d -a dc side voltage; x is X B1 -leakage reactance converted to the secondary side for winding a1x 1; x is X B2 -leakage reactance converted to the secondary side for winding b1x 1;
preferably, the step 4) performs modeling according to the various mathematical models, builds a traction network model by using PSCAD, and performs PSCAD modeling on a harmonious D2 locomotive model and a shaoshan 4 locomotive model.
Preferably, said step 5): and calculating the measured traction network current, and measuring the required current harmonic content, the negative sequence current and the three-phase unbalance degree.
The invention has the advantages that:
1. the invention simulates the operation of different sections of two types of locomotives in a traction power supply system in a PSCAD/EMTDC simulation platform for the first time, and the locomotives are connected with a traction network to enable the electric operation of the locomotives to be connected, so that researchers can select the positions of the locomotives operated in the traction network according to own requirements, different types of locomotives and different working conditions of the locomotive operation, and thus the capability of comprehensively and truly reflecting the problems of harmonic waves, negative sequences and three-phase unbalance brought by the operation of the electric locomotives of different types and the locomotives in the traction network under different working conditions can be comprehensively and truly reflected.
The electromagnetic transient simulation program has electromagnetic transient simulation calculation capability and is characterized in that a simulated power network adopts an a, b and c three-phase model or a more common full-phase model, and the electromagnetic transient simulation program must be described by a differential equation, and physical quantities in the system are instantaneous values rather than phasors. Therefore, the traction network and locomotive simulation based on the electromagnetic transient mode can accurately simulate the influence of different locomotives on the electric energy quality of the traction network, and the defect that the simulation of the electromechanical simulation programs such as MATLAB and the like under an AC/DC power system is not accurate can be overcome.
According to an actual traction network structure model, a traction substation takes electricity from a 110kV side, the traction substation is changed into two single-phase 55kV overhead contact lines through a Scott transformer, a traction power supply system model is set according to static power element parameters and dynamic power element parameters, a locomotive running section can be set according to unit impedance, and an electric locomotive takes electricity from the overhead contact lines. And respectively constructing a shaoshan 4 type train model and a Harmonious D2 type train model according to elements required by the locomotive, and establishing a PSCAD equivalent model. According to the actual simulation of the running condition of the actual electric iron in the traction power supply system, the harmonic generation problem of each model and the negative sequence content of the whole electric iron on the 110kV side are recorded, and then the three-phase unbalance degree can be measured.
2. The invention has better operability, and changes the connection condition according to the running of different locomotives in the traction network, thereby monitoring the harmonic content, the negative sequence content and the three-phase unbalance of the traction network.
3. In the PSCAD/EMTDC environment, each part is independently modeled, and the structural model is optimized under the condition that the power grid characteristics of the upper level of the traction network are not influenced, so that the circuit control is simpler and is easy to realize, and meanwhile, the simulation efficiency and the simulation authenticity are improved.
Drawings
The above-mentioned features and technical advantages of the present invention will become more apparent and readily appreciated from the following description of the embodiments thereof, taken in conjunction with the accompanying drawings.
FIG. 1 is a monolithic platform model of the present invention.
Figure 2 is a flow chart of the overall model building of the present invention.
FIG. 3 is a model of the internal structure of a harmonic D2 locomotive of the present invention.
Fig. 4 is a model of the internal structure of the shaoshan 4 locomotive of the present invention.
Fig. 5 is a graph of the calculation of the traction network current.
Fig. 6 is one of the simulation graphs.
FIG. 7 is a second simulation graph.
Fig. 8 is a third simulation graph.
Fig. 9 is a fourth simulation graph.
Fig. 10 is a control block diagram of an asynchronous motor model equivalent to a direct current motor model.
Detailed Description
Embodiments of an electric iron traction power supply system simulation platform based on PSCAD/EMTDC software according to the present invention will be described below with reference to the accompanying drawings. Those skilled in the art will recognize that the described embodiments may be modified in various different ways, or combinations thereof, without departing from the spirit and scope of the invention. Accordingly, the drawings and description are to be regarded as illustrative in nature and not as restrictive in scope. Furthermore, in the present specification, the drawings are not drawn to scale, and like reference numerals denote like parts.
This embodiment is described in detail below in conjunction with fig. 1-10.
Referring to fig. 1, an electric iron traction power supply system simulation platform based on PSCAD/EMTDC software includes: an alternating-direct-current electric locomotive model (HXD 2) represented by a traction network model (cavity system), an alternating-direct-current electric locomotive model (SS 4) represented by a harmonic-direct-current electric locomotive model (Shaoshan 4), a harmonic and negative sequence detection model, and an alternating-direct-current electric locomotive model, which are connected into the traction network model at the same time, are connected with the harmonic and negative sequence model.
The implementation steps are as follows, as shown in fig. 2:
step 1): acquiring data and parameters required by simulation, establishing parameters required by a traction network model, and harmonious D2 type locomotive and shaoshan 4 type locomotive electrical parameters, wherein the method comprises the following steps: traction network unit impedance, transformer parameter rating, locomotive internal voltage current rating, frequency and impedance. Specifically acquiring voltage effective values at two ends of a transformer in a traction network model, and unit impedance of a traction network line; a harmonic D2 locomotive internal AC/DC side control parameter, an AC/DC side control parameter and an asynchronous motor parameter; the control parameters of the alternating current and direct current sides of the inside of the Shaoshan 4-type locomotive and the parameters of the direct current motor. The locomotive data can be found from two books of "Shaoshan 4-type electric locomotive" and "HXD 2-type electric locomotive".
Step 2): establishing a traction network simulation model, which comprises the following steps: voltage grades at two ends of the transformer and unit impedance parameters of the line; the working principle of the traction network transformer comprises a working mode and a wiring mode. Establishing a harmonious D2 locomotive model, which comprises the following steps: an orthogonal side control model and an orthogonal side control model, as shown in fig. 3. Building a model of a shaoshan 4 locomotive, which comprises the following steps: the cross-side control model is shown in fig. 4.
Step 3): establishing a PSCAD/EMTDC mathematical model;
the traction net model comprises: the transformer model, the line unit impedance mathematical model is as follows:
a. the mathematical model of the transformer in the traction net model is:
b. the mathematical model of the unit impedance in the traction network model is:
Z C ＝0.119+j0.752Ω/km
Z F ＝0.204+j0.885Ω/km
Z R ＝0.162+j0.671Ω/km
Z CR ＝0.057+jO.388Ω/km
Z CF ＝0.057+j0.395Ω/km
Z RF ＝0.057+j0.341Ω/km
C’ CF ＝0.000504uF/km
C’ CR ＝0.002057uF/km
C’ FR ＝0.003262uF/km
wherein: z is Z C Is the unit impedance of the positive feeder line, Z F Is the negative feeder unit impedance, Z R Is the unit impedance of the steel rail, Z CR Z is the unit impedance between the positive feeder and the steel rail CF Is the unit impedance between the positive feeder line and the negative feeder line, Z RF Is the unit impedance between the negative feeder line and the steel rail, C' CR Is the unit capacitance between the positive feeder and the steel rail, C' CF Is the unit capacitance between the positive and negative feed lines, C' RF The positive is the unit capacitance between the negative feeder and the rail.
The harmonious D2 locomotive model comprises an intersection control module and an intersection control module.
a. The mathematical model of the alternating-direct side control module is:
wherein: a-phase, b-phase and c-phase modulated waves u a 、u b 、u c Mutual difference of phases, u z Is a triangular carrier.
b. The orthogonal side control module can equivalent a multivariable, nonlinear and strongly coupled asynchronous motor model into a control block diagram of a direct current motor model by utilizing coordinate transformation, as shown in fig. 10:
the main mathematical model is as follows:
mathematical model of computation of 3s/2r coordinate transformation:
mathematical model of calculation of slip frequency:
mathematical model of voltage feedforward calculation:
the above mentioned: r is R s 、R r -the motor stator and rotor winding resistances respectively; l (L) s 、L r -self-inductance of motor stator and rotor windings respectively; omega s -inverter frequency; sigma-is the leakage inductance of the motor, sigma=1-L 2 m /(L s L r )；L m Is mutual inductance between stator and rotor windings.
The model of the Shaoshan 4 locomotive comprises four sections controlled by alternating current and direct current, and the mathematical model is as follows:
magnetic fluxThe method can be determined by the no-load characteristic curve of the traction motor, and the expression of magnetic fluxes in different exciting current intervals is as follows:
the magnitude of the motor armature current is determined by the level and speed of the traction control system in combination, as follows:
a. mathematical model of the segment I bridge: thyristor T 1 、T 2 Sequentially triggering and calculating T 1 、T 2 Is a trigger angle alpha of (2) 1 、α 2 ：
α 1 ＝α 2 +180°
b. Mathematical model of the II-th bridge: thyristor T 3 、T 4 Sequentially triggering and calculating T 3 、T 4 Is a trigger angle alpha of (2) 3 、α 4 ：
α 3 ＝α 4 +180°
c. Mathematical model of the segment III bridge: thyristor T 1 、T 2 Triggering again, at this time T 1 、T 2 Is a trigger angle alpha of (2) 1 、α 2 The method comprises the following steps:
α 1 ＝α 2 +180°
d. mathematical model of the IV bridge: thyristor T 3 、T 4 Sequentially trigger, T 4 Is a trigger angle alpha of (2) 4 The method comprises the following steps:
step 4) the method comprises the following steps of; generating a PSCAD/EMTDC model;
modeling is carried out according to the various mathematical models, a traction network model is built by using PSCAD, a harmonious D2 type locomotive model is built, and PSCAD modeling is carried out on a shaoshan 4 type locomotive model, as shown in figure 1. Wherein the harmonious D2 locomotive internal structure model is shown in fig. 3, and the shaoshan 4 locomotive internal structure model is shown in fig. 4. The model of the electric locomotive of the Shaoshan 4 type and the harmonious D2 type is connected into a traction network model.
Step 5): detecting harmonic negative sequence generated by the traction network;
and establishing a harmonic and negative sequence detection module, measuring harmonic and negative sequence aiming at current at the traction network side, and calculating the measured traction network current, wherein the required current harmonic content, negative sequence current and three-phase unbalance degree can be measured as shown in fig. 5. As shown in fig. 6 to 9, the harmonic and negative sequence detection module can detect the harmonic content, the negative sequence current and the three-phase imbalance brought by the locomotive to the power grid in real time.
Step 6): and generating an electric iron traction power supply system simulation platform of the PSCAD/EMTDC.
And according to the traction network model, the harmonious D2 locomotive model and the connection information of the shaoshan 4 locomotive model, connecting and combining the model.
The invention can connect the contact net to the locomotive in sections, and simultaneously simulate two types of locomotives, and the working conditions of the locomotives can be changed according to the needs; each part is independently modeled, the superior power grid characteristics of the traction network are not influenced, and the structural model is optimized, so that the circuit control is simpler and is easy to realize, and meanwhile, the simulation efficiency and the simulation authenticity are improved.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. An electric iron traction power supply system simulation platform based on PSCAD/EMTDC, which is characterized by comprising:
the system comprises a traction network model, an alternating-direct-alternating-current electric locomotive model, an alternating-direct-current electric locomotive model and a harmonic wave and negative sequence detection model, wherein the alternating-direct-current electric locomotive model and the alternating-direct-current electric locomotive model are directly connected to the traction network;
the implementation steps are as follows:
step 1): acquiring data and parameters required by simulation:
step 2): establishing a traction network simulation model, wherein the traction network simulation model comprises an alternating-current-direct-current electric locomotive model and an alternating-current-direct-current electric locomotive model;
step 3): establishing a PSCAD/EMTDC mathematical model;
step 4) the method comprises the following steps of; generating a PSCAD/EMTDC model;
step 5): detecting harmonic negative sequence generated by the traction network;
step 6): the simulation platform of the PSCAD/EMTDC electric iron traction power supply system is generated,
the step 2): establishing a traction network simulation model, which comprises the following steps: voltage grades at two ends of the transformer and unit impedance parameters of the line; the traction network transformer working principle comprises a working mode and a wiring mode, and a harmonious D2 locomotive model is established, and comprises the following steps: an orthogonal side control model and an orthogonal side control model; building a model of a shaoshan 4 locomotive, which comprises the following steps: the control model of the alternating-current side and the direct-current side,
the harmonic D2 locomotive model comprises: an intersection-and-intersection-side control model, and an intersection-and-intersection-side control model:
a. the mathematical model of the alternating-direct side control model is:
wherein: a-phase, b-phase and c-phase modulated waves u a 、u b 、u c Mutual difference of phases, u z Is a triangular carrier wave;
b. the orthogonal side control model is used for equivalent transformation of a multivariable, nonlinear and strongly coupled asynchronous motor model into a direct current motor model through coordinate transformation, wherein the mathematical model is as follows:
calculation of 3s/2r coordinate transformation
Calculation of slip frequency
Voltage feedforward calculation
The above mentioned: r is R s 、R r -the motor stator and rotor winding resistances respectively; l (L) s 、L r -self-inductance of motor stator and rotor windings respectively; omega s -inverter frequency; sigma-is the leakage inductance of the motor, sigma=1-L 2 m /(L s L r )；L m Is mutual inductance between stator and rotor windings.
2. The electric iron traction power supply system simulation platform based on PSCAD/EMTDC according to claim 1, wherein,
the step 1): acquiring data and parameters required by simulation: specifically acquiring voltage effective values at two ends of a transformer in a traction network model, and unit impedance of a traction network line; acquiring an AC-DC side control parameter, an AC-DC side control parameter and an asynchronous motor parameter in a harmonious D2 locomotive; and acquiring the control parameters of the alternating current and direct current sides in the shaoshan 4-type locomotive and the parameters of the direct current motor.
3. The PSCAD/EMTDC-based electric iron traction power supply system simulation platform of claim 1, wherein:
establishing parameters required by a traction network model, harmony D2 type locomotive electrical parameters and shaoshan 4 type locomotive electrical parameters, wherein the parameters comprise: traction network unit impedance, transformer parameter rating, locomotive internal voltage current rating, frequency and impedance.
4. The PSCAD/EMTDC-based electric iron traction power supply system simulation platform of claim 1, wherein:
the step 3): a. the mathematical model of the transformer in the traction network model is as follows:
b. the unit impedance model in the traction network model is:
Z C ＝0.119+j0.752Ω/km
Z F ＝0.204+j0.885Ω/km
Z R ＝0.162+j0.671Ω/km
Z CR ＝0.057+j0.388Ω/km
Z CF ＝0.057+j0.395Ω/km
Z RF ＝0.057+j0.341Ω/km
C’ CF ＝0.000504uF/km
C’ CR ＝0.002057uF/km
C’ FR ＝0.003262uF/km
wherein: z is Z C Is the unit impedance of the positive feeder line, Z F Is the negative feeder unit impedance, Z R Is the unit impedance of the steel rail, Z CR Z is the unit impedance between the positive feeder and the steel rail CF Is the unit impedance between the positive feeder line and the negative feeder line, Z RF Is the unit impedance between the negative feeder line and the steel rail, C' CR Is the unit capacitance between the positive feeder and the steel rail, C' CF Is the unit capacitance between the positive and negative feed lines, C' RF The positive is the unit capacitance between the negative feeder and the rail.
5. The PSCAD/EMTDC-based electric iron traction power supply system simulation platform of claim 1, wherein:
the shaoshan 4 locomotive model comprises: and (3) an alternating-direct side control model:
the magnetic flux phi is determined by the no-load characteristic curve of the traction motor, and the expression of the magnetic flux between different excitation current intervals is as follows:
the magnitude of the armature current of the electric locomotive motor of the shaoshan type 4 is determined by the level and the speed of the traction control system, and the relationship is as follows,
6. the PSCAD/EMTDC-based electric iron traction power supply system simulation platform of claim 1, wherein:
and 4) modeling according to the various mathematical models, constructing a traction network model by using PSCAD, and constructing a harmonious D2 type locomotive model and a shaoshan 4 type locomotive model to perform PSCAD modeling.
7. The PSCAD/EMTDC-based electric iron traction power supply system simulation platform of claim 1, wherein:
the step 5): and establishing a harmonic and negative sequence detection module, measuring harmonic and negative sequence aiming at current at the traction network side, calculating the measured traction network current, and measuring the required current harmonic content, negative sequence current and three-phase unbalance degree.
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| CN110932278A (en) * | 2019-12-28 | 2020-03-27 | 上海科能电气科技有限公司 | Simulation method for injecting harmonic waves into power grid of high-speed rail electric locomotive |
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