CN107330229B - Quick simulation system of double-active full-bridge direct-current converter - Google Patents

Quick simulation system of double-active full-bridge direct-current converter Download PDF

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CN107330229B
CN107330229B CN201710647460.7A CN201710647460A CN107330229B CN 107330229 B CN107330229 B CN 107330229B CN 201710647460 A CN201710647460 A CN 201710647460A CN 107330229 B CN107330229 B CN 107330229B
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bridge module
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赵聪
李耀华
王平
李子欣
徐飞
高范强
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Institute of Electrical Engineering of CAS
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Abstract

A rapid simulation system of a double-active full-bridge direct-current converter comprises a primary side H-bridge module, a secondary side H-bridge module and 4 controlled voltage sources S1, S2, S3 and S4. Wherein the primary side H bridgeThe module has 4 input signals Idc1,Iac1,SWp1,SWp2And 4 output terminals a1, b1, c1 and d1, the secondary side H-bridge module has 4 input signals Idc2,Iac2,SWs1,SWs2And 4 output terminals a2, b2, c2, d 2. The primary side H-bridge module, the first controlled voltage source S1 and the second controlled voltage source S2 are equivalent to a primary side H-bridge of the double-active full-bridge direct-current converter, and the secondary side H-bridge module, the third controlled voltage source S3 and the fourth controlled voltage source S4 are equivalent to a secondary side H-bridge of the double-active full-bridge direct-current converter. The simulation system can realize the rapid simulation of the double-active full-bridge direct-current converter.

Description

Quick simulation system of double-active full-bridge direct-current converter
Technical Field
The invention relates to a rapid simulation system of a double-active full-bridge direct-current converter.
Background
In recent years, with the continuous development and construction of extra-high voltage power grids and urban and rural power distribution networks, the power grids of China will be fully developed into the intelligent era. In order to provide more economic, stable and environment-friendly power resources for users and ensure the flexibility and controllability of a power grid, the smart power grid also puts severe requirements on indexes such as reliability, intellectualization and the like of electrical equipment in the future. Power electronic transformers have come into use in this context.
As a core element of the power electronic transformer, namely the double-active full-bridge direct current converter, the performance of the double-active full-bridge direct current converter can directly determine the performance of the power electronic transformer. Moreover, the double-active full-bridge direct-current converter can realize bidirectional power flow and soft switching, and has greater advantages and flexibility in efficiency and control compared with other converters.
However, with the improvement of the voltage class of the application occasions of the double-active full-bridge dc converter, the requirement of the voltage class can be met by adopting a multi-stage double-active full-bridge dc converter cascade structure. Therefore, the number of the switch devices of the whole system is multiplied, great operation burden is brought to the simulation system, and the simulation efficiency of the whole system is greatly reduced. Taking a power electronic transformer with an effective value of an alternating current side line voltage of 10kV as an example, under the condition of not considering redundancy, a modular multilevel converter with 10 sub-modules in each bridge arm is adopted on a rectification side, a 16-stage double-active full-bridge direct current converter is adopted in a direct current link, an input series connection and output parallel connection structure is adopted, 248 switching devices are required in the whole system, and the simulation time can be greatly prolonged due to the huge circuit scale.
In order to solve the problem of prolonged simulation time caused by a huge power electronic circuit, related patents also propose different schemes. Chinese patent CN103593521A proposes a fast simulation method for a full-bridge modular multilevel converter, which performs equivalence on circuit characteristics of the full-bridge modular multilevel converter under two working conditions of unlocking and locking. Chinese patent CN104953873A proposes a fast simulation method for a hybrid modular multilevel converter, which establishes a fast simulation system for the converter under various working conditions such as start, unlock and lock. The above patents are all directed to the rapid simulation problem of different types of modular multilevel converters, and the current patent does not relate to the rapid simulation problem of the dual-active full-bridge direct-current converter.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a rapid simulation system of a double-active full-bridge direct-current converter. The invention can realize the rapid simulation of the double-active full-bridge direct-current converter under various control modes.
The invention relates to a rapid simulation system of a double-active full-bridge direct-current converter, which comprises a primary side H-bridge module, a secondary side H-bridge module and 4 controlled voltage sources S1, S2, S3 and S4. The primary side H-bridge module has 4 input signals Idc1,Iac1,SWp1,SWp2And 4 output terminals a1, b1, c1 and d1, the secondary side H-bridge module has 4 input signals Idc2,Iac2,SWs1,SWs2And 4 output terminals a2, b2,c2, d 2. Wherein, the primary side H-bridge module inputs signal Idc1And Iac1The output terminals a1 and b1 of the primary side H-bridge module are respectively connected with the positive pole and the negative pole of a first controlled voltage source S1, and the output terminals c1 and d1 of the primary side H-bridge module are respectively connected with the positive pole and the negative pole of a second controlled voltage source S2. Input signal I of secondary side H-bridge moduledc2And Iac2Respectively, the direct current and alternating current signals of the secondary side H bridge. Output terminals a2 and b2 of the secondary H-bridge module are respectively connected to the positive pole and the negative pole of the third controlled voltage source S3, and output terminals c2 and d2 of the secondary H-bridge module are respectively connected to the positive pole and the negative pole of the fourth controlled voltage source S4. Between the second controlled voltage source S2 and the third controlled voltage source S3 is a resonant circuit containing an inductor, a capacitor and a high frequency transformer.
The core part of the double-active full-bridge direct-current converter in the double-active full-bridge direct-current converter rapid simulation system, namely the H-bridge equivalent model, is established by using a programming language, so that the problem of overlong simulation time caused by nonlinear elements such as switching devices is solved, and the simulation efficiency can be greatly improved. In the H-bridge equivalent model, the primary H-bridge module, the first controlled voltage source S1 and the second controlled voltage source S2 are equivalent to a primary H-bridge of the dual-active full-bridge dc converter, and the secondary H-bridge module, the third controlled voltage source S3 and the fourth controlled voltage source S4 are equivalent to a secondary H-bridge of the dual-active full-bridge dc converter.
The invention relates to a rapid simulation system of a double-active full-bridge direct-current converter, which has symmetrical primary and secondary sides, and the simulation process is illustrated by taking a primary side H-bridge module as an example, and comprises the following steps:
(1) according to switching signal SW of primary side H-bridge modulep1And SWp2Calculating the current I flowing through the first controlled voltage source S1c1When SWp1=1,SWp2When equal to 0, Ic1=Idc1-Iac1(ii) a When SWp1=0,SWp2When 1, Ic1=Idc1+Iac1(ii) a When SWp1=1,SWp2When 1, Ic1=Idc1(ii) a When SWp1=0,SWp2When equal to 0, Ic1=Idc1
(2) The voltage between the output terminal a1 and the output terminal b1 of the primary side H-bridge module is calculated according to the following expression:
Figure GDA0002432646780000031
wherein, Uab(k) For the voltage between output terminal a1 and output terminal b1 for the kth control period, Uab(k-1) is the voltage between the output terminal a1 and the output terminal b1 in the (k-1) th control period, k is any positive integer, C is the equivalent capacitance of the first controlled voltage source S1 of the primary side H bridge, and Ic1Is the current through the first controlled voltage source S1 calculated according to step (1).
(3) The voltage between the output terminal c1 and the output terminal d1 of the primary side H-bridge module is calculated according to the following expression
Ucd(k)=(SWp1-SWp2)Uab(k) (2)
Wherein, Ucd(k) K is any positive integer, which is the voltage between the output terminal c1 and the output terminal d1 for the kth control period.
The simulation steps of the secondary side H-bridge module of the double-active full-bridge direct-current converter rapid simulation system are the same as those of the primary side H-bridge module.
Drawings
Fig. 1 is a circuit topology of a conventional dual active full-bridge dc converter;
FIG. 2 is a block diagram of a fast simulation system of a dual active full-bridge DC converter according to the present invention;
FIG. 3 is a graph showing simulated voltage and current waveforms using a conventional dual active full bridge DC converter;
fig. 4 shows the voltage and current waveforms of the fast simulation system using the dual active full-bridge dc converter of the present invention.
Detailed Description
The invention is further described below with reference to the accompanying drawings and the detailed description.
Fig. 1 shows a circuit topology of a conventional dual active full-bridge dc converter. The double-active full-bridge direct current converter consists of a primary side H bridge and a secondary side H bridge, wherein each H bridge comprises 4 switching devices. The AC link of the primary and secondary H-bridge is a resonant circuit containing a high-frequency transformer and a capacitor.
Fig. 2 is a block diagram of a fast simulation system of a dual active full-bridge dc converter according to the present invention. The simulation system consists of a primary side H-bridge module, a secondary side H-bridge module and 4 controlled voltage sources S1, S2, S3 and S4. The primary side H-bridge module has 4 input signals Idc1,Iac1,SWp1,SWp2And 4 output terminals a1, b1, c1 and d1, the secondary side H-bridge module has 4 input signals Idc2,Iac2,SWs1,SWs2And 4 output terminals a2, b2, c2, d 2. Wherein, Idc1And Iac1The output terminals a1 and b1 of the primary side H-bridge module are respectively connected with the positive pole and the negative pole of a first controlled voltage source S1, and the output terminals c1 and d1 of the primary side H-bridge module are respectively connected with the positive pole and the negative pole of a second controlled voltage source S2. I isdc2And Iac2Respectively, the direct current and alternating current signals of the secondary side H bridge. Output terminals a2 and b2 of the secondary H-bridge module are respectively connected to the positive pole and the negative pole of the third controlled voltage source S3, and output terminals c2 and d2 of the secondary H-bridge module are respectively connected to the positive pole and the negative pole of the fourth controlled voltage source S4. Between the second controlled voltage source S2 and the third controlled voltage source S3 is a resonant circuit containing an inductor, a capacitor and a high frequency transformer.
The primary side H-bridge module, the first controlled voltage source S1 and the second controlled voltage source S2 are equivalent to a primary side H-bridge of the double-active full-bridge direct-current converter, and the secondary side H-bridge module, the third controlled voltage source S3 and the fourth controlled voltage source S4 are equivalent to a secondary side H-bridge of the double-active full-bridge direct-current converter.
The following is one embodiment of the present invention.
The parameters of the dual-active full-bridge dc converter in this embodiment are as follows:
Figure GDA0002432646780000041
Figure GDA0002432646780000051
fig. 3 shows a voltage-current waveform simulated by using a conventional dual active full-bridge dc converter. The primary side current and the secondary side current of the high-frequency transformer, the primary side voltage and the secondary side voltage of the high-frequency transformer, and the primary side voltage and the current waveform of the high-frequency transformer are respectively from top to bottom.
The simulation steps of the double-active full-bridge direct current converter are as follows:
(1) according to switching signal SW of primary side H-bridge modulep1And SWp2Calculating the current I flowing through the first controlled voltage source S1c1When SWp1=1,SWp2When equal to 0, Ic1=Idc1-Iac1(ii) a When SWp1=0,SWp2When 1, Ic1=Idc1+Iac1(ii) a When SWp1=1,SWp2When 1, Ic1=Idc1(ii) a When SWp1=0,SWp2When equal to 0, Ic1=Idc1
(2) The voltage between the output terminal a1 and the output terminal b1 of the primary side H-bridge module is calculated according to the following expression:
Figure GDA0002432646780000052
wherein, Uab(k) For the voltage between output terminal a1 and output terminal b1 for the kth control period, Uab(k-1) is the voltage between the output terminal a1 and the output terminal b1 in the (k-1) th control period, k is any positive integer, C is the equivalent capacitance of the first voltage source S1 of the primary side H bridge, and Ic1Is the current calculated according to step (1).
(3) The voltage between the output terminal c1 and the output terminal d1 of the primary side H-bridge module is calculated according to the following expression:
Ucd(k)=(SW1-SW2)Uab(k) (2)
wherein, Ucd(k) Output terminal c1 and output terminal d1 for the kth control periodAnd k is any positive integer.
The simulation steps of the secondary side H-bridge module of the double-active full-bridge direct-current converter rapid simulation system are the same as those of the primary side H-bridge module.
Fig. 4 shows the voltage and current waveforms of the fast simulation system using the dual active full-bridge dc converter of the present invention. The primary side current and the secondary side current of the high-frequency transformer, the primary side voltage and the secondary side voltage of the high-frequency transformer, and the primary side voltage and the current waveform of the high-frequency transformer are respectively from top to bottom. As can be seen from fig. 3 and 4, the simulation result obtained by the rapid simulation system of the dual-active full-bridge dc converter of the present invention is the same as that of the existing dual-active full-bridge dc converter, and in the case that the simulation step size is 1 μ s and the simulation time is 0.5s, the simulation result shown in fig. 3 needs 50s, and the simulation result shown in fig. 4 only needs 22 s. Therefore, the double-active full-bridge direct-current converter rapid simulation system can accurately reflect the circuit characteristics of the double-active full-bridge direct-current converter, shorten the simulation time and improve the simulation efficiency.

Claims (5)

1. A quick simulation system of two initiative full-bridge direct current converters, its characterized in that: the rapid simulation system consists of a primary side H-bridge module, a secondary side H-bridge module and 4 controlled voltage sources S1, S2, S3 and S4; the primary side H-bridge module has 4 input signals Idc1,Iac1,SWp1,SWp2And 4 output terminals a1, b1, c1 and d1, the secondary side H-bridge module has 4 input signals Idc2,Iac2,SWs1,SWs2And 4 output terminals a2, b2, c2, d 2; wherein, the input signal I of the primary side H-bridge moduledc1Is a direct current signal of a primary side H-bridge and an input signal I of a primary side H-bridge moduleac1Is an alternating current signal of a primary side H bridge; input signal SW of primary side H-bridge modulep1And SWp2Is a switching signal of a primary side H bridge; the output terminal a1 of the primary side H-bridge module is connected with the positive pole of a first controlled voltage source S1, and the output terminal b1 of the primary side H-bridge module is connected with the negative pole of the first controlled voltage source S1; the output terminal c1 of the primary side H-bridge module is connected with the anode of a second controlled voltage source S2The output terminal d1 of the primary side H-bridge module is connected with the negative electrode of a second controlled voltage source S2; input signal I of secondary side H-bridge moduledc2Is a DC current signal of a secondary H-bridge and an input signal I of a secondary H-bridge moduleac2Is an alternating current signal of a secondary side H bridge; input signal SW of secondary side H-bridge modules1,SWs2Is a switching signal of a secondary side H bridge; the output terminal a2 of the secondary side H-bridge module is connected with the positive pole of a third controlled voltage source S3, the output terminal b2 of the secondary side H-bridge module is connected with the negative pole of the third controlled voltage source S3, the output terminal c2 of the secondary side H-bridge module is connected with the positive pole of a fourth controlled voltage source S4, and the output terminal d2 of the secondary side H-bridge module is connected with the negative pole of the fourth controlled voltage source S4; between the second controlled voltage source S2 and the third controlled voltage source S3 is a resonant circuit containing an inductor, a capacitor and a high frequency transformer.
2. The dual-active full-bridge dc converter fast simulation system according to claim 1, wherein: in an equivalent model of an H bridge which is a core part of the double-active full-bridge direct-current converter, a primary side H bridge module, a first controlled voltage source S1 and a second controlled voltage source S2 are equivalent to a primary side H bridge of the double-active full-bridge direct-current converter, and a secondary side H bridge module, a third controlled voltage source S3 and a fourth controlled voltage source S4 are equivalent to a secondary side H bridge of the double-active full-bridge direct-current converter.
3. The dual-active full-bridge dc converter fast simulation system according to claim 1, wherein: and a resonant circuit comprising a capacitor and a high-frequency transformer is arranged between the second controlled voltage source S2 and the third controlled voltage source S3.
4. The dual-active full-bridge dc converter fast simulation system according to claim 1 or 2, wherein: AC current signal I of primary side H-bridge module obtained by measurementac1DC current signal Idc1And a switch signal SWp1、SWp2Calculating the output voltage of the primary side H-bridge module, and realizing circuit characteristic simulation by using a programming language; the simulation process of the primary side H-bridge module comprises the following steps:
(1) according to the switching signal SW of the primary side H-bridge modulep1And SWp2Calculating the current I flowing through the first controlled voltage source S1c1When SWp1=1,SWp2When equal to 0, Ic1=Idc1-Iac1(ii) a When SWp1=0,SWp2When 1, Ic1=Idc1+Iac1(ii) a When SWp1=1,SWp2When 1, Ic1=Idc1(ii) a When SWp1=0,SWp2When equal to 0, Ic1=Idc1
(2) The voltage between the output terminal a1 and the output terminal b1 of the primary side H-bridge module is calculated according to the following expression:
Figure FDA0002432646770000021
wherein, Uab(k) For the voltage between output terminal a1 and output terminal b1 of the primary side H-bridge module of the kth control cycle, Uab(k-1) is the voltage between the output terminal a1 and the output terminal b1 of the primary side H-bridge module in the (k-1) th control period, k is any positive integer, C is the equivalent capacitance of the first controlled voltage source S1, and I isc1The current calculated according to the step (1);
(3) the voltage between the output terminal c1 and the output terminal d1 of the primary side H-bridge module is calculated according to the following expression:
Ucd(k)=(SW1-SW2)Uab(k) (2)
wherein, Ucd(k) The voltage between the output terminal c1 and the output terminal d1 of the primary side H-bridge module in the kth control period is k, and k is any positive integer.
5. The dual-active full-bridge dc converter fast simulation system according to claim 1 or 2, wherein: using the measured AC current signal I of the secondary side H-bridge moduleac2DC current signal Idc2And a switch signal SWs1、SWs2Calculating the output voltage of the secondary side H-bridge module;the simulation process and steps of the secondary side H-bridge module are the same as those of the primary side H-bridge module.
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CN108959780B (en) * 2018-07-06 2022-12-20 中国科学院电工研究所 Large signal simulation model of single-phase power electronic transformer
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CN103516224A (en) * 2013-10-09 2014-01-15 清华大学 Mixed phase-shifting control method used for dually-active full-bridge direct current converter
CN103617315A (en) * 2013-11-20 2014-03-05 合肥工业大学 Modeling method on basis of effective duty cycle for phase-shifted full-bridge ZVS (zero voltage switching) converter
CN104467434A (en) * 2014-11-21 2015-03-25 清华大学 Transient phase-shifting control method for double-active full-bridge direct current converter

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CN103516224A (en) * 2013-10-09 2014-01-15 清华大学 Mixed phase-shifting control method used for dually-active full-bridge direct current converter
CN103617315A (en) * 2013-11-20 2014-03-05 合肥工业大学 Modeling method on basis of effective duty cycle for phase-shifted full-bridge ZVS (zero voltage switching) converter
CN104467434A (en) * 2014-11-21 2015-03-25 清华大学 Transient phase-shifting control method for double-active full-bridge direct current converter

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