CN102684534A

CN102684534A - High-capacity superconducting energy storage transducer provided with H-bridge current transformer

Info

Publication number: CN102684534A
Application number: CN2012101282383A
Authority: CN
Inventors: 张辉; 刘金虹; 李金祁; 李洁
Original assignee: Xian University of Technology
Current assignee: Xian University of Technology
Priority date: 2012-04-27
Filing date: 2012-04-27
Publication date: 2012-09-19

Abstract

The invention discloses a high-capacity superconducting energy storage transducer provided with an H-bridge current transformer, which comprises the H-bridge current transformer, a chopper and a superconducting magnet, wherein the H-bridge current transformer comprises four IGBT (Insulated-Gate Bipolar Transistor) pipes in a bridge manner; the chopper is connected with the H-bridge current transformer through a capacitor; two ends of the superconducting magnet are respectively connected with the two IGBT pipes and two diodes in series to form a power unit converter, and a plurality of the power unit converters are connected in series to form a multi-stage cascaded converter. By adopting the topological structure of the multi-stage H-bridge cascaded current transformer and matching with the frequency-doubling carrier phase shifted SPWM (Sinusoidal Pulse Width Modulation), the high-capacity superconducting energy storage transducer can obtain the output voltage wave shape of the 2N+1 level, the harmonic content is reduced effectively, a huge transformer in the prior art is omitted, the circumfluence problem existing in the prior art is overcome, the voltage withstanding problem and current withstanding problem of a switch tube can be solved effectively during the high-capacity conversion process, and the high-capacity conversion can be achieved.

Description

A kind of big capacity superconducting energy storage converter that has H bridge current transformer

Technical field

The present invention relates to a kind of superconducting energy storage converter, be specifically related to a kind of big capacity superconducting energy storage converter of the H of having bridge current transformer.

Background technology

The current power grid operation of China is faced with lot of challenges such as the maximum power consumption load continues to increase, the batch (-type) energy inserts accounting expansion, the peak regulation means are limited, and high-quality, self-healing, safety, cleaning, economy, interaction are the target settings of China's intelligent grid.Energy storage improves efficiency in energy savings, promotes the low-carbon (LC) energy development, guarantees regional energy security, renewable energy resources scale utilization, build aspects such as using distributed energy, intelligent grid construction and use important effect is arranged, and can obtain extensively and sufficient utilization in generating, transmission of electricity, distribution, electricity consumption four big links.To solve following several technical issues and realize that the energy storage scale is used: enough big stored energy capacitance, enough fast power response speed, enough big exchange power, sufficiently high energy storage efficiency, discharging and recharging the cycle etc. of enough lacking.

Superconducting magnetic energy storage is the coil that utilizes superconductor to process, and through the converter excitation of supplying power, in coil, produces magnetic field and storage power by electrical network, when needed can be with this energy through inverter advance to wire back net or make other purposes.Maintain superconducting state like energy storage coil, then stored energy can almost be that the permanent storage of lossless ground is gone down in the coil always, till needs discharge it.Therefore, compare with other energy-storage systems, superconducting magnetic energy storage has very high conversion efficiency and reaction speed faster.

Big capacity superconducting energy storage (its exemplary power more than 1MW, be dozens of minutes～several hours running time) voltage-source type topological structure is disclosed in the document " superconducting magnetic energy storage system (SMES) and in application on power system ": three level structures, series multiplexization, parallel-connection multipleization and multipleization chopper etc.These structures or control are complicated, perhaps need huge transformer, perhaps have problems such as circulation, seldom use in the reality.

Summary of the invention

The object of the present invention is to provide a kind of big capacity superconducting energy storage converter that has H bridge current transformer simple in structure, solve prior art control complicacy, and have the problem of circulation.

The objective of the invention is to realize like this; A kind of big capacity superconducting energy storage converter that has H bridge current transformer; Comprise H bridge current transformer, chopper and superconducting magnet; Said H bridge current transformer is made up of four IGBT pipe bridge formulas, and said chopper is connected with said H bridge current transformer through capacitor, and manage with two IGBT of said chopper respectively at said superconducting magnet two ends and two diodes are connected, and formation power cell converter and a plurality of series connection are the multi-stage cascade converter.

Said capacitor two ends parallel connection protective resistance.

Above-mentioned power cell converter is three, and said three power cell converters series connection is the three-stage cascade converter.

Said three-stage cascade converter is three-phase and connects and composes three grades of three-phase cascade converters with the Y type.

Above-mentioned multi-stage cascade converter is three-phase and connects and composes three-phase multi-stage cascade converter with the Y type.

The present invention has following beneficial effect; The present invention adopts the topological structure of multistage H bridge cascade converter, and each adopts N H bridge power unit converter cascaded structure mutually, the topological structure through multistage H bridge cascade converter and cooperate frequency multiplication carrier phase SPWM modulation can obtain the output voltage waveforms of 2N+1 level; Effectively reduced harmonic content; Omit the huge transformer of prior art, overcome the circulation problem that prior art exists, and effectively solved the withstand voltage of switching tube in the big capacity conversion process; Anti-flow problem is realized big capacity conversion.

Description of drawings

Fig. 1 is the embodiment of the invention 1 circuit topology figure;

Fig. 2 is the embodiment of the invention 1 timing chart;

Fig. 3 is the embodiment of the invention 1 an output end voltage oscillogram;

Fig. 4 is the embodiment of the invention 2 circuit topology figure;

Fig. 5 is the embodiment of the invention 3 circuit topology figure;

Fig. 6 is an embodiment of the invention power cell converter circuit topological diagram;

Fig. 7 is embodiment of the invention chopper circuit figure;

Fig. 8 is embodiment of the invention chopper coil charges status circuit figure;

Fig. 9 is embodiment of the invention chopper afterflow status circuit figure;

Figure 10 is an embodiment of the invention chopper coil discharge circuit diagram.

Among the figure, 1.H bridge current transformer, 2. chopper, 3. power cell converter, Lsc. superconducting magnet; Ta11.IGBT manages i, and Ta12.IGBT manages ii, and Ta13.IGBT manages iii, and Ta14.IGBT manages iv, and Ta17.IGBT manages v; Ta18.IGBT manages vi, and Ta21.IGBT manages vii, Ta22.IGBTviii, and Ta31.IGBT manages ix, and Ta32.IGBT manages x; Da17. diode i, Da18. diode ii, Ca1. capacitor, R. protective resistance, K. switch.

Embodiment

Embodiment 1; A kind of big capacity superconducting energy storage converter that has H bridge current transformer; Be a phase three-stage cascade converter,, comprise H bridge current transformer 1, chopper 2 and superconducting magnet Lsc referring to Fig. 1, Fig. 6; H bridge current transformer 1 is made up of IGBT pipe iTa11, IGBT pipe iiTa12, IGBT pipe iiiTa13 and IGBT pipe ivTa14 bridge-type; Chopper 2 is connected with H bridge current transformer 1 through capacitor Ca1, connects with IGBT pipe vTa17, IGBT pipe viTa18 and diode i Da17, the diode iiDa18 of chopper 2 respectively and constitute power cell converter 3 in superconducting magnet Lsc two ends, and control superconducting magnet Lsc discharges and recharges and afterflow.Three power cell converter 3 series connection obtain a phase three-stage cascade converter.In order to prevent that the instantaneous overvoltage phenomenon from appearring in capacitor Ca1 two ends, parallel connection protective resistance R connects K switch when instantaneous overvoltage occurring at capacitor Ca1 two ends, can effectively prevent the instantaneous overvoltage phenomenon.

The present embodiment course of work is referring to Fig. 7, Fig. 8, Fig. 9 and Figure 10, when at first superconduction inductance Lsc charges; IGBT pipe viTa18 normal open; IGBT pipe vTa17 copped wave control, through controlling the charge rate that IGBT manages the duty ratio control superconduction inductance Lsc of vTa17 conducting, as shown in Figure 8.In like manner, also can be through control IGBT pipe vTa17 normal open, IGBT pipe viTa18 copped wave control realizes the charging control of superconduction inductance.This moment, current transformer was operated in rectification state, through electric capacity of voltage regulation Ca1, gave superconduction inductance Lsc charging; When chopper is operated in the afterflow pattern, has only a pipe conducting among IGBT pipe vTa17 and the IGBT pipe viTa18.As shown in Figure 9, during IGBT pipe viTa18 conducting, by diode iiDa18 afterflow.With should IGBT during pipe vTa17 conducting, by diode iDa17 afterflow; When superconduction inductance Lsc discharges, and IGBT pipe viTa18 (or turn-off, by IGBT pipe vTa17 copped wave control, the discharge rate of the duty ratio control superconduction inductance Lsc through control IGBT pipe vTa17, shown in figure 10.In like manner, also can be through control IGBT pipe vTa17 normal off, IGBT pipe viTa18 copped wave control realizes the discharge control of superconduction inductance.This moment, converter was operated in inverter mode, kept the voltage at electric capacity of voltage regulation Ca1 two ends stable.

Referring to Fig. 2, IGBT in the one-level power cell converter 3 pipe iTa11 impulse waveform is that carrier wave Vcr1 and sinusoidal modulation wave relatively produce, when sinusoidal modulation wave greater than carrier wave Vcr1, the output signal leads to IGBT pipe iTa11; The impulse waveform of IGBT pipe iiTa12 is that Vcr1-(with 180 ° of Vcr1 phase shifts) compares with sinusoidal modulation wave, and two pipe pulses of same brachium pontis are opposite.ITa11 is logical when the IGBT pipe, and iiTa12 is disconnected for the IGBT pipe, H bridge current transformer 1 output V _A1For+E.In like manner, IGBT pipe viiTa21 impulse waveform is that Vcr2 and sinusoidal modulation wave relatively produce in the secondary power unit converter 3, and wherein Vcr2 is with Vcr1 60 ° of phase shifts backward; IGBT pipe viii Ta22 impulse waveform is that Vcr2-and sinusoidal modulation wave relatively produce, and Vcr2-is that viiTa21 is logical when the IGBT pipe with Vcr1-60 ° of phase shifts backward, and viiiTa22 is disconnected for the IGBT pipe, and H bridge current transformer 1 is exported V _A2For+E.In like manner, IGBT pipe ixTa31 impulse waveform is that Vcr3 and sinusoidal modulation wave relatively produce in three grades of power cell converters 3, and Vcr3 is with Vcr2 60 ° of phase shifts backward; IGBT pipe x Ta32 impulse waveform is that Vcr3-and sinusoidal modulation wave relatively produce, and Vcr3-is with Vcr2-60 ° of phase shifts backward, and when IGBT pipe ix Ta31 is logical, IGBT pipe x Ta32 is disconnected, and H bridge current transformer 1 is exported V _A3For+E.After cascade, voltage waveform such as V between two output terminals A C+ and the AC- _AN(V _AN=V _A1+ V _A2+ V _A3) shown in, referring to Fig. 3.

Embodiment 2, and a kind of big capacity superconducting energy storage converter that has H bridge current transformer is three-phase three-stage cascade converter; Referring to Fig. 4, comprise A phase, B phase and C mutually, each comprises three power cell converters 3 of series connection each other mutually; Power cell converter 3 comprises H bridge current transformer 1, chopper 2 and superconducting magnet Lsc; H bridge current transformer 1 is by IGBT pipe iTa11, and IGBT manages iiTa12, and IGBT manages iiiTa13; IGBT pipe ivTa14 bridge-type is formed; Chopper 2 is connected with H bridge current transformer 1 through capacitor Ca1, connects with IGBT pipe iTa17, IGBT pipe iiTa18 and diode iDa17, the diode iiDa18 of chopper 2 respectively and constitute power cell converter 3 in superconducting magnet Lsc two ends, and control superconducting magnet Lsc discharges and recharges and afterflow.Through parallel connection protective resistance R, three power cell converter series connection, obtain the three-stage cascade converter again at capacitor Ca1 two ends; A phase, B are by three power cell converter series connection with C mutually mutually, connect and compose three-phase three-stage cascade converter with the Y type.

The course of work is referring to embodiment 1.

Embodiment 3, and a kind of big capacity superconducting energy storage converter that has H bridge current transformer is three-phase multi-stage cascade converter; Comprise A phase, B phase and C mutually; Each comprises three above power cell converter 3 series connection mutually, and power cell converter 3 comprises H bridge current transformer 1, chopper 2 and superconducting magnet Lsc, and H bridge current transformer 1 is by IGBT pipe iTa11; IGBT manages iiTa12; IGBT manages iiiTa13, and IGBT pipe ivTa14 bridge-type is formed, and chopper 2 is connected with said H bridge current transformer 1 through capacitor Ca1; Connect with IGBT pipe iTa17, IGBT pipe iiTa18 and diode iDa17, the diode iiDa18 of chopper 2 respectively and constitute power cell converter 3 in superconducting magnet Lsc two ends, control superconducting magnet Lsc discharges and recharges and afterflow.In order to prevent that the instantaneous overvoltage phenomenon from appearring in the electric capacity two ends, through parallel connection protective resistance R, when instantaneous overvoltage occurring, connect K switch at capacitor Ca1 two ends, effectively prevent the instantaneous overvoltage phenomenon.A plurality of power cell converter series connection, obtain three-phase multi-stage cascade converter.

The course of work is referring to embodiment 1.

Claims

1. big capacity superconducting energy storage converter that has H bridge current transformer; Comprise H bridge current transformer (1), chopper (2) and superconducting magnet (Lsc); It is characterized in that: said H bridge current transformer (1) is made up of four IGBT pipe bridge formulas; Said chopper (2) is connected with said H bridge current transformer (1) through capacitor (Ca1), and manage with two IGBT of said chopper (2) respectively at said superconducting magnet (Lsc) two ends and two diodes are connected, and formation power cell converter (3) and a plurality of series connection are the multi-stage cascade converter.

2. the big capacity superconducting energy storage converter that has H bridge current transformer as claimed in claim 1 is characterized in that: said capacitor (Ca1) two ends parallel connection protective resistance (R).

3. according to claim 1 or claim 2 the big capacity superconducting energy storage converter that has H bridge current transformer is characterized in that: said power cell converter (3) has three and series connection to be the three-stage cascade converter.

4. the big capacity superconducting energy storage converter that has H bridge current transformer as claimed in claim 3 is characterized in that: said three-stage cascade converter is three-phase and connects and composes three grades of three-phase cascade converters with the Y type.

5. according to claim 1 or claim 2 the big capacity superconducting energy storage converter that has H bridge current transformer is characterized in that: said multi-stage cascade converter is three-phase and connects and composes three-phase multi-stage cascade converter with the Y type.