CN113659846A - T-shaped AC-DC-AC nine-level converter - Google Patents
T-shaped AC-DC-AC nine-level converter Download PDFInfo
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- CN113659846A CN113659846A CN202110963683.0A CN202110963683A CN113659846A CN 113659846 A CN113659846 A CN 113659846A CN 202110963683 A CN202110963683 A CN 202110963683A CN 113659846 A CN113659846 A CN 113659846A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
- H02M5/42—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
- H02M5/44—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac
- H02M5/453—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal
- H02M5/458—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M5/4585—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only having a rectifier with controlled elements
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/12—Arrangements for reducing harmonics from ac input or output
- H02M1/126—Arrangements for reducing harmonics from ac input or output using passive filters
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
- Rectifiers (AREA)
Abstract
The invention discloses a T-shaped AC-DC-AC nine-level converter, belonging to the technical field of power converters, which comprise a power grid voltage source egFilter inductor, T-type converter A, T-type converter B, filter inductor LfAnd a filter capacitor CL. The T-type converter A and the T-type converter B have the same structure, and the T-type converter A comprises a switch tube Sa1～Sa8Switching tube S1aSwitching tube S2aCapacitor Ca1And a capacitor Ca2. The invention realizes the direct realization of alternating current to alternating current with controllable output end without an isolation transformer, can provide high-quality voltage sources for various alternating current loads with maximum power of not more than 50kW, can realize the output of high level, can be connected to a medium-voltage distribution network without a power frequency transformer, and can ensure the quality of grid-connected current by using smaller filter inductor. The invention can be suitable for occasions with higher voltage level and higher power.
Description
Technical Field
The invention relates to the field of power electronic converters, in particular to a T-shaped AC-DC-AC nine-level converter.
Background
Single-phase-dc-ac converters have been used in many applications, such as uninterruptible power supplies, unified power quality regulators, ac voltage regulators, (High-performance on line UPS using three-leg-type converter J. IEEE Transactions on Industrial Electronics,2005,52(3): 889) 897.) a three-leg topology for leg sharing is disclosed, which not only saves costs but also reduces losses compared to the conventional two-H bridge topology. In a traditional two-level or three-level AC-DC converter, the harmonic components contained in the output voltage and the network side current are more, and the phase difference exists between the network side current and the network voltage, so that the network side unit power factor operation is difficult to realize. (Design and Implementation of a high height Efficient Three-Level T-Type Converter for Low-Voltage Applications [ J ]. IEEE Transactions on Power Electronics,2013,28(2):899-907.) compared to the conventional NPC Type Three-Level structure, the T Type Three-Level bridge arm has two clamp diodes reduced, and the number of the switching tubes through which the current flows in the bridge arm under the state of the majority Level is 1, so that the T Type Three-Level structure has lower conduction loss. However, the improvement of the voltage resistance of the switching tube leads the switching tube to have higher switching loss, so the T-shaped three-level is only suitable for middle and low voltage occasions.
Disclosure of Invention
The invention aims to provide a T-type AC-DC-AC nine-level converter aiming at overcoming the defects of the prior art, and aims to realize the conversion of AC-AC electric energy under the condition of not using a power frequency transformer, so that the converter has the capabilities of low total harmonic distortion of input current and output voltage and controllable output voltage.
The technical solution for realizing the purpose of the invention is as follows: a T-type AC-DC-AC nine-level converter is characterized by comprising a power grid voltage source egFilter inductance LsT-type converter A, T-type converter B and filter inductor LfFilter capacitor CLAnd a load resistance R.
The above-mentionedPositive pole and filter inductance L of AC power supplysIs connected to the filter inductor LsIs connected with the rectifying port of the T-type converter A, the inverting port of the T-type converter A is connected with the filter inductor LfIs connected to the filter inductor LfThe other end of the filter capacitor C is connected with one end of a load resistor R, the other end of the load resistor R is connected with an inversion port of a T-type converter B, and the filter capacitor CLThe load resistor R is connected in parallel, a rectification port of the T-type converter B is connected with the negative electrode of the alternating current power supply, and a common bridge arm of the T-type converter A is connected with the midpoint of the common bridge arm of the T-type converter A.
Preferably, the T-type converter a and the T-type converter B have the same structure, and the T-type converter a includes a switch tube Sa1～Sa8Switching tube S1aSwitching tube S2aCapacitor Ca1And a capacitor Ca2。
The switch tube Sa1And the source electrode of the switching tube Sa2Drain electrode of (1), and switching tube Sa3Is connected to the drain of the switching tube Sa1Respectively with an open capacitance Ca1Positive electrode of (2), switching tube S1aOf the drain electrode, the switching tube Sa5Is connected to the drain of the switching tube Sa2Source and switch Sa4Is connected to the drain of the switching tube Sa4And a capacitor Ca1Negative electrode of (1), capacitor Ca2Negative electrode of (2), switching tube Sa8The drain of (1) the switching tube Sa3And a capacitor Ca2Negative electrode of (2), switching tube S2aSource electrode and switch tube Sa7Is connected to the source of the switching tube S1aSource electrode of (1) and switching tube S2aIs connected to the drain of the switching tube Sa5And the source electrode of the switching tube Sa7Drain electrode of (1), and switching tube Sa6Is connected to the drain of the switching tube Sa6Source electrode of (1) and switching tube Sa8Of the T-type converter A, a switching tube S of the T-type converter A1aSource electrode of (1) and switching tube S2aAnd the drain electrode connecting point of the T-shaped converter B and a switching tube S of the T-shaped converter B1aSource electrode of (1) and switching tube S2aIs connected to the drain electrodeAnd (4) point connection.
Preferably, the switch tube S of the T-type converter Aa1Source electrode of (1) and switching tube Sa2Drain electrode of (1), and switching tube Sa3As a rectifying port of a T-type converter a, a switching tube S of which1aSource electrode of (1) and switching tube S2aAs the common bridge arm midpoint of the T-type converter a.
Compared with the prior art, the invention has the beneficial effects that: the T-type AC-DC-AC nine-level converter can provide a high-quality voltage source for various AC loads. The T-type AC-DC-AC nine-level converter can realize high-level output, and further reduces the stress of the switching tube through cascade connection. The medium-voltage distribution network can be connected without a power frequency transformer, and the quality of grid-connected current can be ensured by using smaller filter inductor. The invention can be suitable for occasions with higher voltage level and higher power.
Drawings
Fig. 1 is a topology structure of a T-type ac-dc-ac nine-level converter.
Fig. 2 shows a rectifier circuit of the T-type converter a.
Fig. 3 shows a rectifier circuit of the T-type converter B.
Fig. 4 shows an inverter circuit of the T-type converter a.
Fig. 5 shows an inverter circuit of the T-type converter B.
Fig. 6 is a control method of a topology structure of a T-type ac-dc-ac nine-level converter.
Detailed Description
In order to more clearly describe the idea, technical solution and advantages of the present invention, the detailed description is shown by the examples and the accompanying drawings. It is to be understood that the embodiments described are only some of the embodiments of the invention, and not all of them. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
As shown in FIG. 1, a T-type AC-DC-AC nine-level converter comprises a grid voltage source egFilter inductance LsT-type converter A, T-type converter B and filter inductor LfFilter capacitor CLAnd a load resistance R;
the positive pole of the alternating current power supply and the filter inductor LsIs connected to the filter inductor LsIs connected with the rectifying port of the T-type converter A, the inverting port of the T-type converter A is connected with the filter inductor LfIs connected to the filter inductor LfThe other end of the filter capacitor C is connected with one end of a load resistor R, the other end of the load resistor R is connected with an inversion port of a T-type converter B, and the filter capacitor CLThe load resistor R is connected in parallel, a rectification port of the T-type converter B is connected with the negative electrode of the alternating current power supply, and a common bridge arm of the T-type converter A is connected with the midpoint of the common bridge arm of the T-type converter A.
As shown in fig. 1, the T-type converter a and the T-type converter B have the same structure, and the T-type converter a includes a switch tube Sa1～Sa8Switching tube S1aSwitching tube S2aCapacitor Ca1And a capacitor Ca2。
The switch tube Sa1And the source electrode of the switching tube Sa2Drain electrode of (1), and switching tube Sa3Is connected to the drain of the switching tube Sa1And the drain electrode of (C) and a capacitor (C)a1Positive electrode of (2), switching tube S1aOf the drain electrode, the switching tube Sa5Is connected to the drain of the switching tube Sa2Source and switch Sa4Is connected to the drain of the switching tube Sa4And a capacitor Ca1Negative electrode of (1), capacitor Ca2Negative electrode of (2), switching tube Sa8The drain of (1) the switching tube Sa3And a capacitor Ca2Negative electrode of (2), switching tube S2aSource electrode and switch tube Sa7Is connected to the source of the switching tube S1aSource electrode of (1) and switching tube S2aIs connected to the drain of the switching tube Sa5And the source electrode of the switching tube Sa7Drain electrode of (1), and switching tube Sa6Is connected to the drain of the switching tube Sa6Source electrode of (1) and switching tube Sa8Of the T-type converter A, a switching tube S of the T-type converter A1aSource electrode of (1) and switching tube S2aAnd the drain electrode connecting point of the T-shaped converter B and a switching tube S of the T-shaped converter B1aSource electrode of (1) and switching tube S2aIs connected to the drain connection point of (b).
As shown in FIG. 1, the switch tube S of the T-type converter Aa1Source electrode of (1) and switching tube Sa2Drain electrode of (1), and switching tube Sa3As a rectifying port of a T-type converter a, a switching tube S of which1aSource electrode of (1) and switching tube S2aAs the common bridge arm midpoint of the T-type converter a.
The working process of the invention specifically comprises the following steps:
as shown in FIG. 2, a switch tube S in a T-type converter A is takena1，Sa2，Sa3，Sa4，S1a，S2aThe circuit part included is the rectifying circuit of the T-type converter A, as shown in figure 3, a switch tube S in a T-type converter B is takenb1，Sb2，Sb3，Sb4，S1b，S2bThe circuit part included is the rectifying circuit of the T-type converter B, as shown in FIG. 4, a switch tube S in the T-type converter A is takena5，Sa6，Sa7，Sa8The circuit part is an inverter circuit of a T-type converter A, and as shown in FIG. 5, a switch tube S in a T-type converter B is takenb5，Sb6，Sb7，Sb8The circuit part comprises an inverter circuit of the T-type converter B.
As shown in fig. 6, the grid voltage source e is detectedgVoltage v ofgDetecting the grid current igDetecting the capacitance C of the T-type converter A and the T-type converter Ba1、Ca2、Cb1And Cb2Voltage V ofCa1、VCa2、VCb1And VCb2Summing, by applying a voltage VCa1、VCa2、VCb1And VCb2Averaging to obtain average value V of DC voltageavgAverage value V of DC voltageavgReference value V from the mean value of the DC voltageavg *Taking difference, the difference is calculated by PIObtaining a reference value i of the power grid currentg *Reference value i of the grid currentg *With the actual value igObtaining a difference value, and obtaining a modulation signal V at a rectification side by the difference value through a PI algorithmin *To modulate the signal V on the rectification sidein *And pulse signals of switching tubes of rectifying circuits of the T-type converter A and the T-type converter B are obtained after PWM modulation. Detecting the voltage v of the resistor ROA command value v of the voltage of the resistor RO *With the actual value vOObtaining difference, and obtaining an inversion side modulation signal v through the difference value through a PI algorithmL *Amplitude V ofL *Detecting the rectified side modulation signal v by means of a phase-locked loopin *Will rectify the side modulation signal vin *After being sine, the phase of the modulation signal is converted into the amplitude V of the modulation signal at the inversion sideL *Multiplied modulated signal v on the inverting sideL *Will invert the side modulation signal vL *And pulse signals of switching tubes of inverter circuits of the T-type converter A and the T-type converter B are obtained after PWM modulation.
Example (b):
a T-type AC-DC-AC nine-level converter comprises a power grid voltage source egFilter inductance LsT-type converter A, T-type converter B and filter inductor LfFilter capacitor CLAnd a load resistance R.
The positive pole of the alternating current power supply and the filter inductor LsIs connected to the filter inductor LsIs connected with the rectifying port of the T-type converter A, the inverting port of the T-type converter A is connected with the filter inductor LfIs connected to the filter inductor LfThe other end of the filter capacitor C is connected with one end of a load resistor R, the other end of the load resistor R is connected with an inversion port of a T-type converter B, and the filter capacitor CLThe load resistor R is connected in parallel, a rectification port of the T-type converter B is connected with the negative electrode of the alternating current power supply, and a common bridge arm of the T-type converter A is connected with the midpoint of the common bridge arm of the T-type converter A.
The T-type converter A and the T-type converter B have the same structure, and the T-type converterA comprises a switch tube Sa1～Sa8Switching tube S1aSwitching tube S2aCapacitor Ca1Capacitor Ca2。
The switch tube Sa1And the source electrode of the switching tube Sa2Drain electrode of (1), and switching tube Sa3Is connected to the drain of the switching tube Sa1Respectively with an open capacitance Ca1Positive electrode of (2), switching tube S1aOf the drain electrode, the switching tube Sa5Is connected to the drain of the switching tube Sa2Source and switch Sa4Is connected to the drain of the switching tube Sa4And a capacitor Ca1Negative electrode of (1), capacitor Ca2Negative electrode of (2), switching tube Sa8The drain of (1) the switching tube Sa3And a capacitor Ca2Negative electrode of (2), switching tube S2aSource electrode and switch tube Sa7Is connected to the source of the switching tube S1aSource electrode of (1) and switching tube S2aIs connected to the drain of the switching tube Sa5And the source electrode of the switching tube Sa7Drain electrode of (1), and switching tube Sa6Is connected to the drain of the switching tube Sa6Source electrode of (1) and switching tube Sa8Of the T-type converter A, a switching tube S of the T-type converter A1aSource electrode of (1) and switching tube S2aAnd the drain electrode connecting point of the T-shaped converter B and a switching tube S of the T-shaped converter B1bSource electrode of (1) and switching tube S2bIs connected to the drain connection point of (b).
The T-type converter B comprises a switch tube Sb1～Sb8Switching tube S1bSwitching tube S2bCapacitor Cb1Capacitor Cb2. The switch tube Sb1And the source electrode of the switching tube Sb2Drain electrode of (1), and switching tube Sb3Is connected to the drain of the switching tube Sb1Respectively with an open capacitance Cb1Positive electrode of (2), switching tube S1bOf the drain electrode, the switching tube Sb5Is connected to the drain of the switching tube Sb2Source and switch Sb4Is connected to the drain of the switching tube Sb4And a capacitor Cb1Negative electrode of (1), capacitor Cb2Negative electrode of (2), switching tube Sb8The drain of (1) the switching tube Sb3And a capacitor Cb2Negative electrode of (2), switching tube S2bSource electrode and switch tube Sb7Is connected to the source of the switching tube S1bSource electrode of (1) and switching tube S2bIs connected to the drain of the switching tube Sb5And the source electrode of the switching tube Sb7Drain electrode of (1), and switching tube Sb6Is connected to the drain of the switching tube Sb6Source electrode of (1) and switching tube Sb8Of the T-type converter A, a switching tube S of the T-type converter A1aSource electrode of (1) and switching tube S2aAnd the drain electrode connecting point of the T-shaped converter B and a switching tube S of the T-shaped converter B1bSource electrode of (1) and switching tube S2bIs connected to the drain connection point of (b).
Switch tube S of T-type converter Aa1Source electrode of (1) and switching tube Sa2Drain electrode of (1), and switching tube Sa3As a rectifying port of a T-type converter a, a switching tube S of which1aSource electrode of (1) and switching tube S2aAs the common bridge arm midpoint of the T-type converter a.
Switch tube S of T-type converter Bb1Source electrode of (1) and switching tube Sb2Drain electrode of (1), and switching tube Sb3As a rectifying port of a T-type converter B having a switching tube S1bSource electrode of (1) and switching tube S2bAs the common bridge arm midpoint of the T-type converter B.
The above embodiments are merely illustrative of the technical ideas of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like based on the technical ideas of the present invention should be included in the scope of the present invention.
Claims (3)
1. A T-type AC-DC-AC nine-level converter is characterized in that: comprising a mains voltage source egFilter inductance LsT-type converter A, T-type converter B and filter inductor LfFilter capacitor CLAnd a load resistance R.
2. The T-type ac-dc-ac nine-level converter according to claim 1, wherein: the T-type converter A and the T-type converter B have the same structure, and the T-type converter A comprises a switch tube Sa1～Sa8Switching tube S1aSwitching tube S2aCapacitor Ca1And a capacitor Ca2。
3. The T-type ac-dc-ac nine-level converter according to any one of claims 1 to 2, characterized in that: switch tube S of T-type converter Aa1Source electrode of (1) and switching tube Sa2Drain electrode of (1), and switching tube Sa3As a rectifying port of a T-type converter a, a switching tube S of which1aSource electrode of (1) and switching tube S2aAs the common bridge arm midpoint of the T-type converter a.
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2021
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