CN110808689A - Bidirectional switch MMC submodule topology with direct current fault clearing capacity - Google Patents
Bidirectional switch MMC submodule topology with direct current fault clearing capacity Download PDFInfo
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- CN110808689A CN110808689A CN201911132350.2A CN201911132350A CN110808689A CN 110808689 A CN110808689 A CN 110808689A CN 201911132350 A CN201911132350 A CN 201911132350A CN 110808689 A CN110808689 A CN 110808689A
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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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
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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
- H02M1/32—Means for protecting converters other than automatic disconnection
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Abstract
The invention discloses a bidirectional switch MMC sub-module topology with direct-current fault clearing capacity, wherein an input side of the MMC sub-module is respectively connected with a first IGBT (insulated gate bipolar translator) anti-parallel diode and a second IGBT anti-parallel diode, the first IGBT anti-parallel diode is connected to a positive port of a first capacitor, and the port is simultaneously and reversely connected with one end of an eighth diode; the second IGBT anti-parallel diode is connected to the negative-polarity port of the first capacitor, the port is connected with one end of a bidirectional switch, the other end of the bidirectional switch and the other end of the eighth diode are connected with the output side of the MMC sub-module, and the second capacitor and the third IGBT anti-parallel diode are connected between the negative-polarity port of the first capacitor and the output side of the MMC sub-module in series. Compared with the existing half-bridge sub-module, the number of the used IGBTs is unchanged, so that the overhead line is widely applied to the MMC-based flexible direct-current power transmission field, and the loss and the engineering investment are reduced.
Description
Technical Field
The invention relates to the technical field of power electronics, in particular to a bidirectional switch MMC sub-module topology with direct-current fault clearing capacity.
Background
The increasing proportion of distributed renewable energy sources connected to the power grid makes the defects of the traditional power frequency alternating current power grid more obvious, namely low transmission efficiency, poor electric energy quality and low transmission power. The direct current transmission is low in operation cost and high in transmission efficiency, and can be compatible with different types of distributed renewable energy sources, so that the defects of the traditional alternating current transmission are perfectly overcome. The traditional direct current transmission adopting the thyristor converter station limits the development of direct current transmission due to the defects of reactive power consumption, high waveform distortion, phase change failure and small transmission power. By means of the Modular design of the Modular Multilevel Converter (MMC), the Modular Multilevel Converter has the advantages of high transmission efficiency, low switching frequency and high electric energy quality, overcomes the defects of a thyristor rectifier and promotes the development of a direct-current transmission technology. The successful application of the MMC in the field of flexible direct-current transmission further promotes the development of a direct-current transmission technology. At present, half-bridge submodules are adopted in MMC which are put into operation, and fault current cannot be quickly turned off when short-circuit fault occurs on a direct current side due to the fact that anti-parallel diodes are adopted in the submodules, so that normal operation of the MMC is threatened. Therefore, when a direct current side short circuit occurs, the direct current side circuit breaker must be disconnected, so that power transmission is interrupted, and therefore, the current MMC flexible direct current transmission which is put into production adopts high-price cables to reduce the probability of direct current side faults. Every submodule piece of half-bridge MMC only can export two levels, consequently when MMC is applied to the high voltage level, the submodule piece figure of needs sharply increases, triggers the module control degree of difficulty and increases, and these weak points will increase the investment of direct current transmission engineering undoubtedly, have restricted MMC in the development of direct current transmission field.
It is therefore desirable to have a bi-directional switch MMC submodule topology with dc fault clearing capability that solves the problems of the prior art.
Disclosure of Invention
The invention discloses a bidirectional switch MMC sub-module topology with direct-current fault clearing capacity, wherein an input side of the MMC sub-module is respectively connected with a first IGBT (insulated gate bipolar translator) anti-parallel diode and a second IGBT anti-parallel diode, the first IGBT anti-parallel diode is connected to a positive port of a first capacitor, and the port is simultaneously and reversely connected with one end of an eighth diode; the second IGBT anti-parallel diode is connected to the negative-polarity port of the first capacitor, the port is connected with one end of a bidirectional switch, the other end of the bidirectional switch and the other end of the eighth diode are connected with the output side of the MMC sub-module, and the second capacitor and the third IGBT anti-parallel diode are connected between the negative-polarity port of the first capacitor and the output side of the MMC sub-module in series.
Preferably, the MMC sub-module topology further includes four switching tubes; the capacitance V is realized by controlling the first and the second switch tubesc1Accessing a circuit; the third and fourth switch tubes are controlled to enable the capacitor Vc2The circuit is accessed, thereby simplifying the trigger pulse.
Preferably, when the first switch is closed, the second switch is open, the third switch is closed and the fourth switch is open, the output V isc1+Vc2A voltage; the current direction is positive ism>At 0, the current passes through: the circuit comprises a first diode, a first capacitor, a second capacitor and a third diode; when the current direction is negative ism<At 0, the current passes through: the circuit comprises a third switching tube, a second capacitor, a first capacitor and a first switching tube.
Preferably, when the first switch is closed, the second switch is open, the third switch is open and the fourth switch is closed, the output V is outputc1A voltage; the current direction is positive ism>At 0, the current passes through: the first diode, the first capacitor, the seventh diode, the fourth switch tube and the fifth diode; the direction of current is negative ism<At 0, the current passes through: the diode comprises a sixth diode, a fourth switching tube, a fourth diode, a first capacitor and a first switching tube.
Preferably, when the first switch is open, the second switch is closed, the third switch is closed and the fourth switch is open, the output V isc2A voltage; the current direction is positive ism>At 0, the current passes through: the second switch tube, the second capacitor and the third diode; the direction of current is negative ism<At 0, the current passes through: the third switch tube, the second capacitor and the second diode.
Preferably, when the first switch is opened, the second switch is closed, the third switch is opened and the fourth switch is closed, the output voltage is 0; when the current direction is positive, the current passes through the following steps in sequence: the second switch tube, the seventh diode, the fourth switch tube and the fifth diode; when the current direction is negative, the current passes through: the fourth diode is connected with the fourth switch tube.
Preferably, when the first switch is turned off, the second switch is turned off, the third switch is turned off and the fourth switch is turned off, the current direction is positive ism>At 0, output Vc1+Vc2Voltage, current in turn: the circuit comprises a first diode, a first capacitor, a second capacitor and a third diode; when the first switch is turned off, the second switch is turned off, the third switch is turned off and the fourth switch is turned off, and the current direction is negative ism<At 0, output-Vc1Voltage, current in turn: an eighth diode, a first capacitor and a second diode.
The invention provides a bidirectional switch MMC sub-module topology with direct current fault clearing capacity, which solves the problems that the traditional half-bridge MMC can not clear direct current faults, turn off fault current and need to interrupt power transmission.
Drawings
FIG. 1 is a topological structure diagram of an MMC sub-module with a DC fault clearing capability bidirectional switch of the present invention.
Fig. 2 is a diagram of the current flow path in the normal operation mode of the present invention.
Fig. 3 is a diagram of the current flow path during fault lockout according to the present invention.
Detailed Description
In order to make the implementation objects, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be described in more detail below with reference to the accompanying drawings in the embodiments of the present invention. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are only some, but not all embodiments of the invention. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, the bidirectional switch MMC submodule topology with dc fault clearing capability has input sides connected with first and second IGBT anti-parallel diodes respectively, the first IGBT anti-parallel diode is connected to the positive port of the first capacitor, and the port is also connected to one end of the eighth diode in reverse direction; the second IGBT anti-parallel diode is connected to the negative-polarity port of the first capacitor, the port is connected with one end of a bidirectional switch, the other end of the bidirectional switch and the other end of the eighth diode are connected with the output side of the MMC sub-module, and the second capacitor and the third IGBT anti-parallel diode are connected between the negative-polarity port of the first capacitor and the output side of the MMC sub-module in series.
The current flow paths of the new sub-module during normal operation and fault blocking are shown in table 1: the submodule can output different voltages when different switch tubes are conducted, the charge-discharge state of the capacitor can be determined by the current direction, and the voltage of each capacitor can be independently output, so that when a string of submodules is connected in series, the string of submodules can output expected levels, thereby improving transmission power and simplifying manufacturing process.
In normal operation, T1 and T2 can be controlled to make the capacitor Vc1 connected into the circuit, and T3 and T4 can be controlled to make the capacitor Vc2 connected into the circuit, thus simplifying trigger pulse. When the fault is locked, the capacitors are respectively connected into the circuit through the freewheeling diodes, so that the purposes of inhibiting fault current and clearing direct-current faults are achieved.
Table 1: current path of novel submodule current in normal work and fault blocking
When the first switch is closed, the second switch is opened, the third switch is closed and the fourth switch is opened as shown in figure 2(a), the output V isc1+Vc2A voltage; the current direction is positive ism>At 0, the current passes through: the circuit comprises a first diode, a first capacitor, a second capacitor and a third diode; when the first switch is closed, the second switch is opened, the third switch is closed and the fourth switch is opened, and V is outputc1+Vc2A voltage; the direction of current is negative ism<At 0, the current passes through: the circuit comprises a third switching tube, a second capacitor, a first capacitor and a first switching tube.
When the first switch is closed, the second switch is opened, the third switch is opened and the fourth switch is closed as shown in figure 2(b), the output V isc1A voltage; the current direction is positive ism>At 0, the current passes through: the first diode, the first capacitor, the seventh diode, the fourth switch tube and the fifth diode; the direction of current is negative ism<At 0, the current passes through: the diode comprises a sixth diode, a fourth switching tube, a fourth diode, a first capacitor and a first switching tube.
When the first switch is opened, the second switch is closed, the third switch is closed and the fourth switch is opened as shown in figure 2(c), the output V isc2A voltage; the current direction is positive ism>At 0, the current passes through: the second switch tube, the second capacitor and the third diode; the direction of current is negative ism<At 0, the current passes through: the third switch tube, the second capacitor and the second diode.
When the first switch is open, the second switch is closed, the third switch is open and the fourth switch is closed as shown in fig. 2(d), the output voltage is 0; when the current direction is positive, the current passes through the following steps in sequence: the second switch tube, the seventh diode, the fourth switch tube and the fifth diode; when the current direction is negative, the current passes through: the fourth diode is connected with the fourth switch tube.
When the first switch is turned off, the second switch is turned off, the third switch is turned off and the fourth switch is turned off as shown in fig. 3(a), the direct current side has fault IGBT locking, and the current direction is positive ism>At 0, output Vc1+Vc2Voltage, current in turn: the circuit comprises a first diode, a first capacitor, a second capacitor and a third diode.
When the first switch is turned off, the second switch is turned off, the third switch is turned off and the fourth switch is turned off as shown in fig. 3(b), the direct current side has fault IGBT locking, and the current direction is negative ism<At 0, output-Vc1Voltage, current in turn: an eighth diode, a first capacitor and a second diode.
Finally, it should be pointed out that: the above examples are only for illustrating the technical solutions of the present invention, and are not limited thereto. Although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (7)
1. A bidirectional switch MMC sub-module topology with direct current fault clearing capability is characterized in that an input side of the MMC sub-module is respectively connected with a first IGBT anti-parallel diode and a second IGBT anti-parallel diode, the first IGBT anti-parallel diode is connected to a positive port of a first capacitor, and the port is simultaneously and reversely connected with one end of an eighth diode; the second IGBT anti-parallel diode is connected to the negative-polarity port of the first capacitor, the port is connected with one end of a bidirectional switch, the other end of the bidirectional switch and the other end of the eighth diode are connected with the output side of the MMC sub-module, and the second capacitor and the third IGBT anti-parallel diode are connected between the negative-polarity port of the first capacitor and the output side of the MMC sub-module in series.
2. According to claim1 the bidirectional switch MMC submodule topology with direct current fault clearance ability, its characterized in that: the MMC sub-module topology further comprises four switching tubes; the capacitance V is realized by controlling the first and the second switch tubesc1Accessing a circuit; the third and fourth switch tubes are controlled to enable the capacitor Vc2The circuit is accessed, thereby simplifying the trigger pulse.
3. The bidirectional switch MMC sub-module topology with DC fault clearance capability of claim 2, wherein: when the first switch is closed, the second switch is opened, the third switch is closed and the fourth switch is opened, and V is outputc1+Vc2A voltage; the current direction is positive ism>At 0, the current passes through: the circuit comprises a first diode, a first capacitor, a second capacitor and a third diode; the direction of current is negative ism<At 0, the current passes through: the circuit comprises a third switching tube, a second capacitor, a first capacitor and a first switching tube.
4. The bidirectional switch MMC sub-module topology with DC fault clearance capability of claim 2, wherein: when the first switch is closed, the second switch is opened, the third switch is opened and the fourth switch is closed, the output V isc1A voltage; the current direction is positive ism>At 0, the current passes through: the first diode, the first capacitor, the seventh diode, the fourth switch tube and the fifth diode; the direction of current is negative ism<At 0, the current passes through: the diode comprises a sixth diode, a fourth switching tube, a fourth diode, a first capacitor and a first switching tube.
5. The bidirectional switch MMC sub-module topology with DC fault clearance capability of claim 2, wherein: when the first switch is turned off, the second switch is turned on, the third switch is turned on and the fourth switch is turned off, and the output V is outputc2A voltage; the current direction is positive ism>At 0, the current passes through: the second switch tube, the second capacitor and the third diode; the direction of current is negative ism<When 0, the current is turned on in sequenceAnd (2) passing: the third switch tube, the second capacitor and the second diode.
6. The bidirectional switch MMC sub-module topology with DC fault clearance capability of claim 2, wherein: when the first switch is switched off, the second switch is switched on, the third switch is switched off and the fourth switch is switched on, and the output voltage is 0; when the current direction is positive, the current passes through the following steps in sequence: the second switch tube, the seventh diode, the fourth switch tube and the fifth diode; when the current direction is negative, the current passes through: the fourth diode is connected with the fourth switch tube.
7. The bidirectional switch MMC sub-module topology with DC fault clearance capability of claim 2, wherein: when the first switch is turned off, the second switch is turned off, the third switch is turned off and the fourth switch is turned off, and the current direction is positive ism>At 0, output Vc1+Vc2Voltage, current in turn: the circuit comprises a first diode, a first capacitor, a second capacitor and a third diode; when the first switch is turned off, the second switch is turned off, the third switch is turned off and the fourth switch is turned off, and the current direction is negative ism<At 0, output-Vc1Voltage, current in turn: an eighth diode, a first capacitor and a second diode.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113904573A (en) * | 2021-10-13 | 2022-01-07 | 山东大学 | Half-bridge improved MMC sub-module topological structure and control method thereof |
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2019
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| CN103904926A (en) * | 2014-03-17 | 2014-07-02 | 华北电力大学 | Improved modular multilevel transverter submodule topology |
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Cited By (2)
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| CN113904573A (en) * | 2021-10-13 | 2022-01-07 | 山东大学 | Half-bridge improved MMC sub-module topological structure and control method thereof |
| CN113904573B (en) * | 2021-10-13 | 2023-10-27 | 山东大学 | Half-bridge improved MMC submodule topological structure and control method thereof |
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Application publication date: 20200218 |