CN102231522A - Power flow controller with failure current limiting function - Google Patents
Power flow controller with failure current limiting function Download PDFInfo
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- CN102231522A CN102231522A CN2011101845764A CN201110184576A CN102231522A CN 102231522 A CN102231522 A CN 102231522A CN 2011101845764 A CN2011101845764 A CN 2011101845764A CN 201110184576 A CN201110184576 A CN 201110184576A CN 102231522 A CN102231522 A CN 102231522A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
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Abstract
The invention discloses a power flow controller with a failure current limiting function. When a power grid does not fail, the power flow controller controls current on a current limiting inductor by a current transformer and regulates equivalent impedance flowing into the power grid, thereby controlling the transmission power of the power grid, and compensates the harmonic waves and reactive power of transmission current by the current transformer; and when the power grid fails, the current limiting inductor is directly connected in series to the power grid to function in failure current limiting, and simultaneously, the power flow controller also can control the current transformer to discharge the current limiting inductor and control the current of the current limiting inductor to better current limiting effects, and can perform steady current limiting by a current limiting bypass, with the current limiting inductor, of a protective circuit to better failure current limiting effects.
Description
Technical field
The present invention relates to a kind of flow controller of failure current limit function.
Background technology
Trend control and failure current limit are the two big core technical barriers that power transmission network faces.Flow controller mainly contains two types at present, a kind of is by changing the equiva lent impedance of circuit, U.S. Pat 00542495 as shown in Figure 1 " control of power transmission line trend ", another kind is to realize by seal in a controlled voltage source from circuit, patent WO 9605642A1 as shown in Figure 2 " general quick flow controller ".These two kinds of flow controllers can both be controlled flowing of grid power effectively, but powerless to electric network fault, the short trouble of electrical network even can be to the destructive destruction of these devices generation itself.Chinese patent 200620069650.2 shown in Figure 3 " THE UPFC with short circuit current limitation function " adopts the variable impedance transformer of overcurrent magnetic circuit saturation characteristic to realize failure current limit; but this circuit can't be realized might causing the damage of the power electronic device of device own at over-current shock to installing the protection of itself.
Summary of the invention
In order to overcome the deficiency of prior art, the invention provides a kind of flow controller with failure current limit function.When the present invention does not break down at electrical network, seal in the equiva lent impedance of electrical network by the Current Regulation on the current transformer control current-limiting inductance, thereby control the size of electrical network through-put power, and compensate the humorous reactive power that involves of transmission current by current transformer; When electrical network breaks down; current-limiting inductance directly seals in electrical network; play the effect of failure current limit; simultaneously can also control current transformer discharges to current-limiting inductance; the size of control current-limiting inductance electric current; improve the effect of current limliting, and can carry out the stable state current limliting, improve the effect of failure current limit by the current limliting branch road at protective circuit bypass current-limiting inductance place.
The present invention has following two kinds of basic structure forms:
1, to have the structure of flow controller of failure current limit function as follows in the present invention: voltage source converter and three-phase filter circuit, chopper and triphase step-down transformer are formed power regulating system in parallel.The three-phase alternating current pressure side of voltage source converter links to each other with the low-pressure side of triphase step-down transformer by filter circuit, and the high-pressure side of triphase step-down transformer links to each other with first three phase mains; Voltage source converter direct current pressure side is connected after the electric capacity parallel connection in parallel with the direct current pressure side of chopper with direct current, the alternating current pressure side of chopper is connected mutually with the direct current pressure side of current-limiting inductance and three-phase diode rectifier and formed the loop; The three-phase alternating current pressure side of three-phase diode rectifier links to each other with an end of first switch, the 3rd switch and the 5th switch respectively, the other end of first switch, the 3rd switch and the 5th switch links to each other with an end of the low-pressure side of first single-phase transformer, second single-phase transformer and the 3rd single-phase transformer respectively, and the other end of the low-pressure side of first single-phase transformer, second single-phase transformer and the 3rd single-phase transformer interconnects; Second switch and the series connection of first resistance form first bypass branch, and first bypass branch is in parallel with the two ends of the low-pressure side of first single-phase transformer; The 4th switch and the series connection of second resistance form second bypass branch, and second bypass branch is in parallel with the two ends of the low-pressure side of second single-phase transformer; The 6th switch and the series connection of the 3rd resistance form the 3rd bypass branch, and the 3rd bypass branch is in parallel with the two ends of the low-pressure side of the 3rd single-phase transformer; One end of first series compensation capacitance, second series compensation capacitance and the 3rd series compensation capacitance links to each other respectively with the three-phase of second three phase mains respectively, and the other end of first series compensation capacitance, second series compensation capacitance and the 3rd series compensation capacitance links to each other with the on high-tension side end of first single-phase transformer, second single-phase transformer and the 3rd single-phase transformer respectively; First single-phase transformer, second single-phase transformer and the on high-tension side other end of the 3rd single-phase transformer link to each other respectively with the three-phase of first three phase mains.Three-phase diode rectifier or replace with three single-phase diode rectifiers, the direct current pressure side of three single-phase diode rectifiers interconnects, and connect with the alternating current pressure side and the current-limiting inductance of chopper, form current circuit, one end of the alternating current pressure side of three single-phase diode rectifiers respectively with first switch, one end of the 3rd switch and the 5th switch links to each other, the other end of the alternating current pressure side of three single-phase diode rectifiers respectively with first single-phase transformer, second single-phase transformer links to each other with an end of the 3rd single-phase transformer low-pressure side, first switch, the other end of the 3rd switch and the 5th switch and first single-phase transformer, second single-phase transformer links to each other with the other end of the 3rd single-phase transformer low-pressure side, and the connected mode of remaining circuit is constant.First bypass branch, second bypass branch and the 3rd bypass branch or be parallel to the high-pressure side of first single-phase transformer, second single-phase transformer and the 3rd single-phase transformer respectively.In the occasion that does not need to carry out trend control, cancellation second switch, the 4th switch, the 6th switch, first compensation condenser, second compensation condenser and the 3rd compensation condenser.Described power regulating system in parallel or the identical power regulating system in parallel of available a plurality of structure combine, and the high-pressure side of the triphase step-down transformer of described combination power regulating system in parallel is parallel with one another, and the ac voltage output of chopper is connected mutually.
The control method with failure current limit function flow controller to this version can be carried out at following two kinds of operating states respectively when the needs trend is controlled: (1) normal operating conditions: this moment first switch, the 3rd switch and the 5th switch closure, second switch, the 4th switch and the 6th switch disconnect, voltage source converter and chopper cooperatively interact, by the electric current on the control current-limiting inductance, control the amplitude of the line current between first three phase mains and second three phase mains, thereby the size of control from first three phase mains to the flow of power second three phase mains, in the electric current, compensation flows to the harmonic current and the reactive power of second three phase mains to voltage source converter from first three phase mains on cooperating chopper control current-limiting inductance; (2) failure current limit state: after electrical network is short-circuited fault, current-limiting inductance is automatically connected into power network line, increased system impedance, thereby reduced the electrical network overcurrent, voltage source converter and chopper cooperate simultaneously, to the current-limiting inductance current discharge, to strengthen current limitation effect, when the current value overrate of current-limiting inductance, first switch, the 3rd switch and the 5th switch are disconnected, second switch, the 4th switch and the 6th switch closure, line voltage distribution will be no longer to the current-limiting inductance charging, by the resistance of bypass branch electrical network is carried out failure current limit.
Can carry out at following two kinds of operating states respectively when not needing trend control the control method with failure current limit function flow controller of this version: (1) normal operating conditions: this moment first switch, the 3rd switch and the 5th switch closure, voltage source converter and chopper cooperatively interact, the amplitude that the amplitude of the electric current of current-limiting inductance is controlled at line current multiply by three values more than the single-phase transformer high-low pressure no-load voltage ratio, the series circuit that be made of three single-phase transformers and diode rectifier this moment does not exert an influence to electrical network, in the electric current, compensation flows to the harmonic current of second three phase mains to voltage source converter from first three phase mains on cooperating chopper control current-limiting inductance, the fluctuation of active power and reactive power; (2) failure current limit state: after electrical network is short-circuited fault, current-limiting inductance is automatically connected into power network line, increased system impedance, thereby reduced the electrical network overcurrent, voltage source converter and chopper cooperate simultaneously, to the current-limiting inductance current discharge, strengthening current limitation effect, when the current value overrate of current-limiting inductance, first switch, the 3rd switch and the 5th switch are disconnected, line voltage distribution will be no longer to the current-limiting inductance charging, by the resistance of bypass branch electrical network is carried out failure current limit.
2, to have the structure of flow controller of failure current limit function as follows in the present invention: current source converter and three-phase filter circuit thereof and triphase step-down transformer are formed power regulating system in parallel; The three-phase alternating current end of current source converter links to each other with the low-pressure side of triphase step-down transformer by filter circuit, and the high-pressure side of triphase step-down transformer links to each other with first three phase mains; Current source converter direct current end is connected mutually with the direct current pressure side of current-limiting inductance and three-phase diode rectifier and is formed the loop; The three-phase alternating current pressure side of three-phase diode rectifier links to each other with an end of first switch, the 3rd switch and the 5th switch respectively, the other end of first switch, the 3rd switch and the 5th switch links to each other with an end of the low-pressure side of first single-phase transformer, second single-phase transformer and the 3rd single-phase transformer respectively, and the other end of the low-pressure side of first single-phase transformer, second single-phase transformer and the 3rd single-phase transformer interconnects; Second switch and the series connection of first resistance form first bypass branch, and first bypass branch is in parallel with the two ends of the low-pressure side of first single-phase transformer; The 4th switch and the series connection of second resistance form second bypass branch, and second bypass branch is in parallel with the two ends of the low-pressure side of second single-phase transformer; The 6th switch and the series connection of the 3rd resistance form the 3rd bypass branch, and the 3rd bypass branch is in parallel with the two ends of the low-pressure side of the 3rd single-phase transformer; One end of first series compensation capacitance, second series compensation capacitance and the 3rd series compensation capacitance links to each other respectively with the three-phase of second three phase mains respectively, and the other end of first series compensation capacitance, second series compensation capacitance and the 3rd series compensation capacitance links to each other with the on high-tension side end of first single-phase transformer, second single-phase transformer and the 3rd single-phase transformer respectively; First single-phase transformer, second single-phase transformer and the on high-tension side other end of the 3rd single-phase transformer link to each other respectively with the three-phase of first three phase mains.Three-phase diode rectifier or replace with three single-phase diode rectifiers, the direct current pressure side of three single-phase diode rectifiers interconnects, and connect with the direct current end and the current-limiting inductance of current source converter, form current circuit, one end of the alternating current pressure side of three single-phase diode rectifiers respectively with first switch, one end of the 3rd switch and the 5th switch links to each other, the other end of the alternating current pressure side of three single-phase diode rectifiers respectively with first single-phase transformer, second single-phase transformer links to each other with an end of the 3rd single-phase transformer low-pressure side, first switch, the other end of the 3rd switch and the 5th switch and first single-phase transformer, second single-phase transformer links to each other with the other end of the 3rd single-phase transformer low-pressure side, and the connected mode of remaining circuit is constant.First bypass branch, second bypass branch and the 3rd bypass branch or be parallel to the high-pressure side of first single-phase transformer, second single-phase transformer and the 3rd single-phase transformer respectively; In the occasion that does not need to carry out trend control, cancellation second switch, the 4th switch, the 6th switch, first compensation condenser, second compensation condenser and the 3rd compensation condenser.Described power regulating system in parallel or the identical power regulating system in parallel of available a plurality of structure combine, the high-pressure side of the triphase step-down transformer of described combination power regulating system in parallel is parallel with one another, and the direct current end of current source converter is connected mutually.
The control method with failure current limit function flow controller to this version can be carried out at following two kinds of operating states respectively when the needs trend is controlled: 1) normal operating conditions: this moment first switch, the 3rd switch and the 5th switch closure, second switch, the 4th switch and the 6th switch disconnect, current source converter is by the electric current on the control current-limiting inductance, control the amplitude of the line current between first three phase mains and second three phase mains, thereby the size of control from first three phase mains to the flow of power second three phase mains, in the electric current, compensation flows to the harmonic current and the reactive power of second three phase mains to current source converter from first three phase mains on the control current-limiting inductance; (2) failure current limit state: after electrical network is short-circuited fault, current-limiting inductance is automatically connected into power network line, increased system impedance, thereby reduced the electrical network overcurrent, current source converter is to the current-limiting inductance current discharge simultaneously, to strengthen current limitation effect, when the current value overrate of current-limiting inductance, first switch, the 3rd switch and the 5th switch are disconnected, second switch, the 4th switch and the 6th switch closure, line voltage distribution will be no longer to the current-limiting inductance charging, and the resistance of bypass branch carries out failure current limit to electrical network.
Can carry out at following two kinds of operating states respectively when not needing trend control the control method with failure current limit function flow controller of this version: (1) normal operating conditions: this moment first switch, the 3rd switch and the 5th switch closure, current source converter multiply by three values more than the single-phase transformer high-low pressure no-load voltage ratio with the amplitude that the amplitude of the electric current of current-limiting inductance is controlled at line current, the series circuit that be made of three single-phase transformers and diode rectifier this moment does not exert an influence to electrical network, in the electric current, compensation flows to the harmonic current of second three phase mains to current source converter from first three phase mains on the control current-limiting inductance, the fluctuation of active power and reactive power; (2) failure current limit state: after electrical network is short-circuited fault, current-limiting inductance is automatically connected into power network line, increased system impedance, thereby reduced the electrical network overcurrent, current source converter is to the current-limiting inductance current discharge, to strengthen current limitation effect simultaneously, when the current value overrate of current-limiting inductance, first switch, the 3rd switch and the 5th switch are disconnected, and line voltage distribution will be no longer to the current-limiting inductance charging, and the resistance of bypass branch carries out failure current limit to electrical network.
Description of drawings
Fig. 1 is the topology diagram of U.S. Pat 00542495 " control of power transmission line trend ";
Fig. 2 is the control block diagram of patent WO 9605642A1 " general quick flow controller ";
Fig. 3 is the control block diagram of Chinese patent 200620069650.2 " THE UPFC with short circuit current limitation function ";
Fig. 4-Fig. 7 is the topology diagram of embodiment of the invention 1-4.
Embodiment
Further specify the present invention below in conjunction with the drawings and specific embodiments.
Fig. 4 is the topological structure of embodiments of the invention 1.As shown in Figure 4, the structure of the embodiment of the invention 1 is as follows: voltage source converter VSC and three-phase filter circuit thereof, chopper chopper and triphase step-down transformer Tr form power regulating system PCS in parallel; The three-phase alternating current pressure side of voltage source converter VSC links to each other by the low-pressure side of filter circuit with triphase step-down transformer Tr, and the high-pressure side of triphase step-down transformer Tr links to each other with the first three phase mains Us; Voltage source converter VSC direct current pressure side is connected after the capacitor C parallel connection in parallel with the direct current pressure side of chopper chopper with direct current, the alternating current pressure side of chopper chopper is connected mutually with the direct current pressure side of current-limiting inductance Ls and three-phase diode rectifier Rf and formed the loop; The three-phase alternating current pressure side of three-phase diode rectifier Rf links to each other with an end of the 5th switch S 5 with first switch S 1, the 3rd switch S 3 respectively, the other end of first switch S 1, the 3rd switch S 3 and the 5th switch S 5 links to each other with an end of the low-pressure side of the first single-phase transformer Tr1, the second single-phase transformer Tr2 and the 3rd single-phase transformer Tr3 respectively, and the other end of the low-pressure side of the first single-phase transformer Tr1, the second single-phase transformer Tr2 and the 3rd single-phase transformer Tr3 interconnects; Second switch S2 and 1 series connection of first resistance R form the first bypass branch P1, and the first bypass branch P1 is in parallel with the two ends of the low-pressure side of the first single-phase transformer Tr1; The 4th switch S 4 and 2 series connection of second resistance R form the second bypass branch P2, and the second bypass branch P2 is in parallel with the two ends of the low-pressure side of the second single-phase transformer Tr2; The 6th switch S 6 and 3 series connection of the 3rd resistance R form the 3rd bypass branch P3, and the 3rd bypass branch P3 is in parallel with the two ends of the low-pressure side of the 3rd single-phase transformer Tr3; The end of the first series compensation capacitance C1, the second series compensation capacitance C2 and the 3rd series compensation capacitance C3 links to each other respectively with the three-phase of the second three phase mains Ug respectively, and the other end of the first series compensation capacitance C1, the second series compensation capacitance C2 and the 3rd series compensation capacitance C3 links to each other with the on high-tension side end of the 3rd single-phase transformer Tr3 with the first single-phase transformer Tr1, the second single-phase transformer Tr2 respectively; The first single-phase transformer Tr1, the second single-phase transformer Tr2 link to each other respectively with the three-phase of the first three phase mains Us with the on high-tension side other end of the 3rd single-phase transformer Tr3.
Fig. 5 is the topological structure of embodiments of the invention 2.As shown in Figure 5, the structure of the embodiment of the invention 2 is as follows: voltage source converter VSC and three-phase filter circuit thereof, chopper chopper and triphase step-down transformer Tr form power regulating system PCS in parallel; The three-phase alternating current pressure side of voltage source converter VSC links to each other by the low-pressure side of filter circuit with triphase step-down transformer Tr, and the high-pressure side of triphase step-down transformer Tr links to each other with the first three phase mains Us; Voltage source converter VSC direct current pressure side is connected after the capacitor C parallel connection in parallel with the direct current pressure side of chopper chopper with direct current, the alternating current pressure side of chopper chopper is connected mutually with the direct current pressure side of current-limiting inductance Ls, the first single-phase diode rectifier Rf1, the second single-phase diode rectifier Rf2 and the 3rd single-phase diode rectifier Rf3 and formed the loop; Three single-phase diode rectifier Rf1, one end of the alternating current pressure side of Rf2 and Rf3 respectively with first switch S 1, the 3rd switch S 3 links to each other with an end of the 5th switch S 3, three single-phase diode rectifier Rf1, the other end of the alternating current pressure side of Rf2 and Rf3 respectively with the first single-phase transformer Tr1, the second single-phase transformer Tr2 links to each other with an end of the 3rd single-phase transformer Tr3 low-pressure side, first switch S 1, the other end of the 3rd switch S 3 and the 5th switch S 5 respectively with the first single-phase transformer Tr1, the second single-phase transformer Tr2 links to each other with the other end of the 3rd single-phase transformer Tr3 low-pressure side; Second switch S2 and 1 series connection of first resistance R form the first bypass branch P1, and the first bypass branch P1 is in parallel with the two ends of the low-pressure side of the first single-phase transformer Tr1; The 4th switch S 4 and 2 series connection of second resistance R form the second bypass branch P2, and the second bypass branch P2 is in parallel with the two ends of the low-pressure side of the second single-phase transformer Tr2; The 6th switch S 6 and 3 series connection of the 3rd resistance R form the 3rd bypass branch P3, and the 3rd bypass branch P3 is in parallel with the two ends of the low-pressure side of the 3rd single-phase transformer Tr3; The end of the first series compensation capacitance C1, the second series compensation capacitance C2 and the 3rd series compensation capacitance C3 links to each other respectively with the three-phase of the second three phase mains Ug respectively, and the other end of the first series compensation capacitance C1, the second series compensation capacitance C2 and the 3rd series compensation capacitance C3 links to each other with the on high-tension side end of the 3rd single-phase transformer Tr3 with the first single-phase transformer Tr1, the second single-phase transformer Tr2 respectively; The first single-phase transformer Tr1, the second single-phase transformer Tr2 link to each other respectively with the three-phase of the first three phase mains Us with the on high-tension side other end of the 3rd single-phase transformer Tr3.
Can control respectively at described two kinds of operating states Fig. 4 and embodiment 1 shown in Figure 5 and the control of embodiment 2: 1 with fault current limiter of trend controlled function, normal operating conditions: this moment first switch S 1, the 3rd switch S 3 and the 5th switch S 5 closures, second switch S2, the 4th switch S 4 and the 6th switch S 6 disconnect, voltage source converter VSC and chopper chopper cooperatively interact, by the electric current on the control current-limiting inductance Ls, control the amplitude of the line current between the first three phase mains Us and the second three phase mains Ug, thereby the size of control from the first three phase mains Us to the flow of power the second three phase mains Ug, in the electric current, compensation flows to harmonic current and the reactive power of the second three phase mains Ug to voltage source converter VSC from the first three phase mains Us on cooperating chopper chopper control current-limiting inductance Ls; 2, failure current limit state: after electrical network is short-circuited fault, current-limiting inductance Ls is automatically connected into power network line, increased system impedance, thereby reduced the electrical network overcurrent, voltage source converter VSC and chopper chopper cooperate simultaneously, to current-limiting inductance Ls current discharge, to strengthen current limitation effect, when the current value overrate of current-limiting inductance Ls, with first switch S 1, the 3rd switch S 3 and the 5th switch S 5 disconnect, second switch S2, the 4th switch S 4 and the 6th switch S 6 closures, line voltage distribution will be no longer to the current-limiting inductance charging, by the resistance of bypass branch electrical network is carried out failure current limit.
Fig. 6 is the topological structure of embodiments of the invention 3.As shown in Figure 6, the structure of the embodiment of the invention 3 is as follows: current source converter CSC and three-phase filter circuit thereof and triphase step-down transformer Tr form power regulating system PCS in parallel; The three-phase alternating current end of current source converter CSC links to each other by the low-pressure side of filter circuit with triphase step-down transformer Tr, and the high-pressure side of triphase step-down transformer Tr links to each other with the first three phase mains Us; Three-phase current source current transformer CSC direct current end is connected mutually with the direct current pressure side of current-limiting inductance Ls and three-phase diode rectifier Rf and is formed the loop; The three-phase alternating current pressure side of three-phase diode rectifier Rf links to each other with an end of the 5th switch S 5 with first switch S 1, the 3rd switch S 3 respectively, the other end of first switch S 1, the 3rd switch S 3 and the 5th switch S 5 links to each other with an end of the low-pressure side of the first single-phase transformer Tr1, the second single-phase transformer Tr2 and the 3rd single-phase transformer Tr3 respectively, and the other end of the low-pressure side of the first single-phase transformer Tr1, the second single-phase transformer Tr2 and the 3rd single-phase transformer Tr3 interconnects; Second switch S2 and 1 series connection of first resistance R form the first bypass branch P1, and the first bypass branch P1 is in parallel with the two ends of the low-pressure side of the first single-phase transformer Tr1; The 4th switch S 4 and 2 series connection of second resistance R form the second bypass branch P2, and the second bypass branch P2 is in parallel with the two ends of the low-pressure side of the second single-phase transformer Tr2; The 6th switch S 6 and 3 series connection of the 3rd resistance R form the 3rd bypass branch P3, and the 3rd bypass branch P3 is in parallel with the two ends of the low-pressure side of the 3rd single-phase transformer Tr3; The end of the first series compensation capacitance C1, the second series compensation capacitance C2 and the 3rd series compensation capacitance C3 links to each other respectively with the three-phase of the second three phase mains Ug respectively, and the other end of the first series compensation capacitance C1, the second series compensation capacitance C2 and the 3rd series compensation capacitance C3 links to each other with the on high-tension side end of the 3rd single-phase transformer Tr3 with the first single-phase transformer Tr1, the second single-phase transformer Tr2 respectively; The first single-phase transformer Tr1, the second single-phase transformer Tr2 link to each other respectively with the three-phase of the first three phase mains Us with the on high-tension side other end of the 3rd single-phase transformer Tr3.
Fig. 7 is the topological structure of embodiments of the invention 4.As shown in Figure 7, the structure of the embodiment of the invention 4 is as follows: current source converter CSC and three-phase filter circuit thereof and triphase step-down transformer are formed power regulating system PCS in parallel; The three-phase alternating current end of current source converter CSC links to each other by the low-pressure side of filter circuit with triphase step-down transformer Tr, and the high-pressure side of triphase step-down transformer Tr links to each other with the first three phase mains Us; Current source converter CSC direct current end is connected mutually with the direct current pressure side of current-limiting inductance Ls, the first single-phase diode rectifier Rf1, the second single-phase diode rectifier Rf2 and the 3rd single-phase diode rectifier Rf3 and is formed the loop; Three single-phase diode rectifier Rf1, one end of the alternating current pressure side of Rf2 and Rf3 respectively with first switch S 1, the 3rd switch S 3 links to each other with an end of the 5th switch S 3, three single-phase diode rectifier Rf1, the other end of the alternating current pressure side of Rf2 and Rf3 respectively with the first single-phase transformer Tr1, the second single-phase transformer Tr2 links to each other with an end of the 3rd single-phase transformer Tr3 low-pressure side, first switch S 1, the other end of the 3rd switch S 3 and the 5th switch S 3 respectively with the first single-phase transformer Tr1, the second single-phase transformer Tr2 links to each other with the other end of the 3rd single-phase transformer Tr3 low-pressure side; Second switch S2 and 1 series connection of first resistance R form the first bypass branch P1, and the first bypass branch P1 is in parallel with the two ends of the low-pressure side of the first single-phase transformer Tr1; The 4th switch S 4 and 2 series connection of second resistance R form the second bypass branch P2, and the second bypass branch P2 is in parallel with the two ends of the low-pressure side of the second single-phase transformer Tr2; The 6th switch S 6 and 3 series connection of the 3rd resistance R form the 3rd bypass branch P3, and the 3rd bypass branch P3 is in parallel with the two ends of the low-pressure side of the 3rd single-phase transformer Tr3; The end of the first series compensation capacitance C1, the second series compensation capacitance C2 and the 3rd series compensation capacitance C3 links to each other respectively with the three-phase of the second three phase mains Ug respectively, and the other end of the first series compensation capacitance C1, the second series compensation capacitance C2 and the 3rd series compensation capacitance C3 links to each other with the on high-tension side end of the 3rd single-phase transformer Tr3 with the first single-phase transformer Tr1, the second single-phase transformer Tr2 respectively; The first single-phase transformer Tr1, the second single-phase transformer Tr2 link to each other respectively with the three-phase of the first three phase mains Us with the on high-tension side other end of the 3rd single-phase transformer Tr3.
Can control respectively at described two kinds of operating states Fig. 6 and embodiment 3 shown in Figure 7 and the control method of embodiment 4: 1 with fault current limiter of trend controlled function, normal operating conditions: this moment first switch S 1, the 3rd switch S 3 and the 5th switch S 5 closures, second switch S2, the 4th switch S 4 and the 6th switch S 6 disconnect, current source converter CSC is by the electric current on the control current-limiting inductance Ls, control the amplitude of the line current between the first three phase mains Us and the second three phase mains Ug, thereby the size of control from the first three phase mains Us to the flow of power the second three phase mains Ug, in the electric current, compensation flows to harmonic current and the reactive power of the second three phase mains Ug to current source converter CSC from the first three phase mains Us on control current-limiting inductance Ls; 2 failure current limit states: after electrical network is short-circuited fault, current-limiting inductance Ls is automatically connected into power network line, increased system impedance, thereby reduced the electrical network overcurrent, current source converter CSC is to current-limiting inductance Ls current discharge simultaneously, to strengthen current limitation effect, when the current value overrate of current-limiting inductance Ls, first switch S 1, the 3rd switch S 3 and the 5th switch S 5 are disconnected, second switch S2, the 4th switch S 4 and the 6th switch S 6 closures, line voltage distribution will be no longer to the current-limiting inductance charging, and the resistance of bypass branch carries out failure current limit to electrical network.
For 4 embodiment shown in Fig. 4,5,6,7, the described first bypass branch P1, the second bypass branch P2 and the 3rd bypass branch P3 or be parallel to the high-pressure side of the first single-phase transformer Tr1, the second single-phase transformer Tr2 and the 3rd single-phase transformer Tr1 respectively.In the occasion that does not need to carry out trend control, cancellation second switch S2, the 4th switch S 4, the 6th switch S 6, the first building-out capacitor C1, the second building-out capacitor C2 and the 3rd building-out capacitor C3; Described power regulating system in parallel or the identical power regulating system in parallel of available a plurality of structure combine, the high-pressure side of the triphase step-down transformer of described combination and power regulating system is parallel with one another, and the alternating current pressure side of chopper or the direct current end of current source converter are connected mutually.Control respectively at two kinds of operating states of described flow controller in the occasion that need not trend control: (1) normal operating conditions: this moment first switch S 1, the 3rd switch S 3 and the 5th switch S 5 closures, voltage source converter VSC and chopper chopper cooperatively interact (or separately by current source converter CSC), the amplitude that the amplitude of the electric current of current-limiting inductance Ls is controlled at line current multiply by three single-phase transformer Tr1, the value that Tr2 and Tr3 high-low pressure no-load voltage ratio are above, this moment is by three single-phase transformer Tr1, Tr2 and Tr3 and diode rectifier Rf1, Rf2, the series circuit that Rf3 or Rf constitute does not exert an influence to electrical network, in the electric current, compensation flows to the harmonic current of the second three phase mains Ug to voltage source converter VSC from the first three phase mains Us on cooperating chopper chopper control current-limiting inductance Ls, the fluctuation of active power and reactive power; (2) failure current limit state: after electrical network is short-circuited fault, current-limiting inductance Ls is automatically connected into power network line, increased system impedance, thereby reduced the electrical network overcurrent, voltage source converter VSC and chopper chopper cooperate (or separately by current source converter CSC) simultaneously, to current-limiting inductance Ls current discharge, to strengthen current limitation effect, when the current value overrate of current-limiting inductance Ls, with first switch S 1, the 3rd switch S 3 and the 5th switch S 5 disconnect, line voltage distribution will be no longer to the current-limiting inductance charging, by the resistance of bypass branch electrical network is carried out failure current limit.
Claims (10)
1. flow controller with failure current limit function, it is characterized in that in the described flow controller: voltage source converter (VSC) and three-phase filter circuit thereof, chopper (chopper) and triphase step-down transformer (Tr) are formed power regulating system in parallel (PCS); The three-phase alternating current pressure side of voltage source converter (VSC) links to each other with the low-pressure side of triphase step-down transformer (Tr) by the three-phase filter circuit, and the high-pressure side of triphase step-down transformer (Tr) links to each other with first three phase mains (Us); Voltage source converter (VSC) direct current pressure side is connected electric capacity (C) back in parallel with direct current in parallel with the direct current pressure side of chopper (chopper), and the alternating current pressure side of chopper (chopper) is connected mutually with the direct current pressure side of current-limiting inductance (Ls) and three-phase diode rectifier (Rf) and formed the loop; The three-phase alternating current pressure side of three-phase diode rectifier (Rf) links to each other with first switch (S1), the 3rd switch (S3) and an end of the 5th switch (S5) respectively, the other end of first switch (S1), the 3rd switch (S3) and the 5th switch (S5) links to each other with first single-phase transformer (Tr1), second single-phase transformer (Tr2) and an end of the low-pressure side of the 3rd single-phase transformer (Tr3) respectively, and the other end of the low-pressure side of first single-phase transformer (Tr1), second single-phase transformer (Tr2) and the 3rd single-phase transformer (Tr3) interconnects; Second switch (S2) and first resistance (R1) series connection form first bypass branch (P1), and first bypass branch (P1) is in parallel with the two ends of the low-pressure side of first single-phase transformer (Tr1); The 4th switch (S4) and second resistance (R2) series connection form second bypass branch (P2), and second bypass branch (P2) is in parallel with the two ends of the low-pressure side of second single-phase transformer (Tr2); The 6th switch (S6) and the 3rd resistance (R3) series connection form the 3rd bypass branch (P3), and the 3rd bypass branch (P3) is in parallel with the two ends of the low-pressure side of the 3rd single-phase transformer (Tr3); One end of first series compensation capacitance (C1), second series compensation capacitance (C2) and the 3rd series compensation capacitance (C3) links to each other respectively with the three-phase of second three phase mains (Ug) respectively, and the other end of first series compensation capacitance (C1), second series compensation capacitance (C2) and the 3rd series compensation capacitance (C3) links to each other with first single-phase transformer (Tr1), second single-phase transformer (Tr2) and the on high-tension side end of the 3rd single-phase transformer (Tr3) respectively; First single-phase transformer (Tr1), second single-phase transformer (Tr2) and the on high-tension side other end of the 3rd single-phase transformer (Tr3) link to each other respectively with the three-phase of first three phase mains (Us).
2. flow controller with failure current limit function, it is characterized in that in the described flow controller: voltage source converter (VSC) and three-phase filter circuit thereof, chopper (chopper) and triphase step-down transformer (Tr) are formed power regulating system in parallel (PCS); The three-phase alternating current pressure side of voltage source converter (VSC) links to each other by the low-pressure side of filter circuit with triphase step-down transformer (Tr), and the high-pressure side of triphase step-down transformer (Tr) links to each other with first three phase mains (Us); Voltage source converter (VSC) direct current pressure side is connected electric capacity (C) back in parallel with direct current in parallel with the direct current pressure side of chopper (chopper), and the alternating current pressure side of chopper (chopper) is connected mutually with the direct current pressure side of current-limiting inductance (Ls), the first single-phase diode rectifier (Rf1), the second single-phase diode rectifier (Rf2) and the 3rd single-phase diode rectifier (Rf3) and formed the loop; Three single-phase diode rectifier (Rf1, Rf2, one end of alternating current pressure side Rf3) respectively with first switch (S1), the 3rd switch (S3) links to each other with an end of the 5th switch (S5), three single-phase diode rectifier (Rf1, Rf2, the other end of alternating current pressure side f3) respectively with first single-phase transformer (Tr1), second single-phase transformer (Tr2) links to each other with an end of the 3rd single-phase transformer (Tr3) low-pressure side, first switch (S1), the other end of the 3rd switch (S3) and the 5th switch (S5) respectively with first single-phase transformer (Tr1), second single-phase transformer (Tr2) links to each other with the other end of the 3rd single-phase transformer (Tr3) low-pressure side; Second switch (S2) and first resistance (R1) series connection form first bypass branch (P1), and first bypass branch (P1) is in parallel with the two ends of the low-pressure side of first single-phase transformer (Tr1); The 4th switch (S4) and second resistance (R2) series connection form second bypass branch (P2), and second bypass branch (P2) is in parallel with the two ends of the low-pressure side of second single-phase transformer (Tr2); The 6th switch (S6) and the 3rd resistance (R3) series connection form the 3rd bypass branch (P3), and the 3rd bypass branch (P3) is in parallel with the two ends of the low-pressure side of the 3rd single-phase transformer (Tr3); One end of first series compensation capacitance (C1), second series compensation capacitance (C2) and the 3rd series compensation capacitance (C3) links to each other respectively with the three-phase of second three phase mains (Ug) respectively, and the other end of first series compensation capacitance (C1), second series compensation capacitance (C2) and the 3rd series compensation capacitance (C3) links to each other with first single-phase transformer (Tr1), second single-phase transformer (Tr2) and the on high-tension side end of the 3rd single-phase transformer (Tr3) respectively; First single-phase transformer (Tr1), second single-phase transformer (Tr2) and the on high-tension side other end of the 3rd single-phase transformer (Tr3) link to each other respectively with the three-phase of first three phase mains (Us).
3. the flow controller with failure current limit function according to claim 1 and 2 is characterized in that described first bypass branch (P1), second bypass branch (P2) and the 3rd bypass branch (P3) are parallel to the high-pressure side of first single-phase transformer (Tr1), second single-phase transformer (Tr2) and the 3rd single-phase transformer (Tr3) respectively; In the occasion that does not need to carry out trend control, cancellation second switch (S2), the 4th switch (S4), the 6th switch (S6), first compensation condenser (C1), second compensation condenser (C2) and the 3rd compensation condenser (C3); Described power regulating system in parallel (PCS) combines with the identical power regulating system in parallel of a plurality of structures, the high-pressure side of the triphase step-down transformer of described combination power regulating system in parallel is parallel with one another, and the ac voltage output of chopper is connected mutually.
4. the flow controller with failure current limit function according to claim 1 and 2, it is characterized in that controlling respectively: (1) normal operating conditions at two kinds of operating states of described flow controller: this moment first switch (S1), the 3rd switch (S3) and the 5th switch (S5) closure, second switch (S2), the 4th switch (S4) and the 6th switch (S6) disconnect, voltage source converter (VSC) and chopper (chopper) cooperatively interact, by the electric current on the control current-limiting inductance (Ls), control the amplitude of the line current between first three phase mains (Us) and second three phase mains (Ug), thereby the size of control from first three phase mains (Us) to the flow of power second three phase mains (Ug), voltage source converter (VSC) is when cooperating chopper (chopper) control current-limiting inductance (Ls) to go up electric current, and compensation flows to the harmonic current and the reactive power of second three phase mains (Ug) from first three phase mains (Us); (2) failure current limit state: after electrical network is short-circuited fault, current-limiting inductance (Ls) is automatically connected into power network line, increased system impedance, thereby reduced the electrical network overcurrent, voltage source converter (VSC) and chopper (chopper) cooperate simultaneously, to current-limiting inductance (Ls) current discharge, to strengthen current limitation effect, when the current value overrate of current-limiting inductance (Ls), with first switch (S1), the 3rd switch (S3) and the 5th switch (S5) disconnect, second switch (S2), the 4th switch (S4) and the 6th switch (S6) closure, line voltage distribution will be no longer to the current-limiting inductance charging, by the resistance of bypass branch electrical network is carried out failure current limit.
5. the flow controller with failure current limit function according to claim 3, it is characterized in that controlling respectively at two kinds of operating states of described flow controller: (1) normal operating conditions in the occasion that need not trend control: this moment first switch (S1), the 3rd switch (S3) and the 5th switch (S5) closure, voltage source converter (VSC) and chopper (chopper) cooperatively interact, the amplitude that the amplitude of the electric current of current-limiting inductance (Ls) is controlled at line current multiply by three single-phase transformer (Tr1, Tr2 and Tr3) the above value of high-low pressure no-load voltage ratio, this moment is by three single-phase transformer (Tr1, Tr2 and Tr3) and diode rectifier (Rf1, Rf2, Rf3 or Rf) series circuit that constitutes do not exert an influence to electrical network, voltage source converter (VSC) is when cooperating chopper (chopper) control current-limiting inductance (Ls) to go up electric current, and compensation flows to the harmonic current of second three phase mains (Ug) from first three phase mains (Us), the fluctuation of active power and reactive power; (2) failure current limit state: after electrical network is short-circuited fault, current-limiting inductance (Ls) is automatically connected into power network line, increased system impedance, thereby reduced the electrical network overcurrent, voltage source converter (VSC) and chopper (chopper) cooperate simultaneously, to current-limiting inductance (Ls) current discharge, to strengthen current limitation effect, when the current value overrate of current-limiting inductance (Ls), first switch (S1), the 3rd switch (S3) and the 5th switch (S5) are disconnected, line voltage distribution will be no longer to the current-limiting inductance charging, by the resistance of bypass branch electrical network is carried out failure current limit.
6. flow controller with failure current limit function, it is characterized in that in described flow controller: current source converter (CSC) and three-phase filter circuit thereof and triphase step-down transformer (Tr) are formed power regulating system in parallel (PCS); The three-phase alternating current end of current source converter (CSC) links to each other by the low-pressure side of filter circuit with triphase step-down transformer (Tr), and the high-pressure side of triphase step-down transformer (Tr) links to each other with first three phase mains (Us); Three-phase current source current transformer (CSC) direct current end is connected mutually with the direct current pressure side of current-limiting inductance (Ls) and three-phase diode rectifier (Rf) and is formed the loop; The three-phase alternating current pressure side of three-phase diode rectifier (Rf) links to each other with first switch (S1), the 3rd switch (S3) and an end of the 5th switch (S5) respectively, the other end of first switch (S1), the 3rd switch (S3) and the 5th switch (S5) links to each other with first single-phase transformer (Tr1), second single-phase transformer (Tr2) and an end of the low-pressure side of the 3rd single-phase transformer (Tr3) respectively, and the other end of the low-pressure side of first single-phase transformer (Tr1), second single-phase transformer (Tr2) and the 3rd single-phase transformer (Tr3) interconnects; Second switch (S2) and first resistance (R1) series connection form first bypass branch (P1), and first bypass branch (P1) is in parallel with the two ends of the low-pressure side of first single-phase transformer (Tr1); The 4th switch (S4) and second resistance (R2) series connection form second bypass branch (P2), and second bypass branch (P2) is in parallel with the two ends of the low-pressure side of second single-phase transformer (Tr2); The 6th switch (S6) and the 3rd resistance (R3) series connection form the 3rd bypass branch (P3), and the 3rd bypass branch (P3) is in parallel with the two ends of the low-pressure side of the 3rd single-phase transformer (Tr3); One end of first series compensation capacitance (C1), second series compensation capacitance (C2) and the 3rd series compensation capacitance (C3) links to each other respectively with the three-phase of second three phase mains (Ug) respectively, and the other end of first series compensation capacitance (C1), second series compensation capacitance (C2) and the 3rd series compensation capacitance (C3) links to each other with first single-phase transformer (Tr1), second single-phase transformer (Tr2) and the on high-tension side end of the 3rd single-phase transformer (Tr3) respectively; First single-phase transformer (Tr1), second single-phase transformer (Tr2) and the on high-tension side other end of the 3rd single-phase transformer (Tr3) link to each other respectively with the three-phase of first three phase mains (Us).
7. flow controller with failure current limit function, it is characterized in that in described flow controller: current source converter (CSC) and three-phase filter circuit thereof and triphase step-down transformer are formed power regulating system in parallel (PCS); The three-phase alternating current end of current source converter (CSC) links to each other by the low-pressure side of filter circuit with triphase step-down transformer (Tr), and the high-pressure side of triphase step-down transformer (Tr) links to each other with first three phase mains (Us); Current source converter (CSC) direct current end is connected mutually with the direct current pressure side of current-limiting inductance (Ls), the first single-phase diode rectifier (Rf1), the second single-phase diode rectifier (Rf2) and the 3rd single-phase diode rectifier (Rf3) and is formed the loop; Three single-phase diode rectifier (Rf1, Rf2, one end of alternating current pressure side Rf3) respectively with first switch (S1), the 3rd switch (S3) links to each other with an end of the 5th switch (S5), three single-phase diode rectifier (Rf1, Rf2, the other end of alternating current pressure side Rf3) respectively with first single-phase transformer (Tr1), second single-phase transformer (Tr2) links to each other with an end of the 3rd single-phase transformer (Tr3) low-pressure side, first switch (S1), the other end of the 3rd switch (S3) and the 5th switch (S5) respectively with first single-phase transformer (Tr1), second single-phase transformer (Tr2) links to each other with the other end of the 3rd single-phase transformer (Tr3) low-pressure side; Second switch (S2) and first resistance (R1) series connection form first bypass branch (P1), and first bypass branch (P1) is in parallel with the two ends of the low-pressure side of first single-phase transformer (Tr1); The 4th switch (S4) and 2 series connection of second resistance R form second bypass branch (P2), and second bypass branch (P2) is in parallel with the two ends of the low-pressure side of second single-phase transformer (Tr2); The 6th switch (S6) and the 3rd resistance (R3) series connection form the 3rd bypass branch (P3), and the 3rd bypass branch (P3) is in parallel with the two ends of the low-pressure side of the 3rd single-phase transformer (Tr3); One end of first series compensation capacitance (C1), second series compensation capacitance (C2) and the 3rd series compensation capacitance (C3) links to each other respectively with the three-phase of second three phase mains (Ug) respectively, and the other end of first series compensation capacitance (C1), second series compensation capacitance (C2) and the 3rd series compensation capacitance (C3) links to each other with first single-phase transformer (Tr1), second single-phase transformer (Tr2) and the on high-tension side end of the 3rd single-phase transformer (Tr3) respectively; First single-phase transformer (Tr1), second single-phase transformer (Tr2) and the on high-tension side other end of the 3rd single-phase transformer (Tr3) link to each other respectively with the three-phase of first three phase mains (Us).
8. according to claim 6 or 7 described flow controllers with failure current limit function, it is characterized in that described first bypass branch (P1), second bypass branch (P2) and the 3rd bypass branch (P3) are parallel to the high-pressure side of first single-phase transformer (Tr1), second single-phase transformer (Tr2) and the 3rd single-phase transformer (Tr3) respectively; In the occasion that does not need to carry out trend control, cancellation second switch (S2), the 4th switch (S4), the 6th switch (S6), first compensation condenser (C1), second compensation condenser (C2) and the 3rd compensation condenser (C3); Described power regulating system in parallel (PCS) combines with the identical power regulating system in parallel of a plurality of structures, the high-pressure side of the triphase step-down transformer of described combination power regulating system in parallel is parallel with one another, and the direct current end of current source converter is connected mutually.
9. according to claim 6 or 7 described flow controllers with failure current limit function, it is characterized in that controlling respectively: (1) normal operating conditions at two kinds of operating states of described flow controller: this moment first switch (S1), the 3rd switch (S3) and the 5th switch (S5) closure, second switch (S2), the 4th switch (S4) and the 6th switch (S6) disconnect, current source converter (CSC) is by the electric current on the control current-limiting inductance (Ls), control the amplitude of the line current between first three phase mains (Us) and second three phase mains (Ug), thereby the size of control from first three phase mains (Us) to the flow of power second three phase mains (Ug), current source converter (CSC) is when control current-limiting inductance (Ls) goes up electric current, and compensation flows to the harmonic current and the reactive power of second three phase mains (Ug) from first three phase mains (Us); (2) failure current limit state: after electrical network is short-circuited fault, current-limiting inductance (Ls) is automatically connected into power network line, increased system impedance, thereby reduced the electrical network overcurrent, current source converter (CSC) is to current-limiting inductance (Ls) current discharge simultaneously, to strengthen current limitation effect, when the current value overrate of current-limiting inductance (Ls), with first switch (S1), the 3rd switch (S3) and the 5th switch (S5) disconnect, second switch (S2), the 4th switch (S4) and the 6th switch (S6) closure, line voltage distribution will be no longer to the current-limiting inductance charging, and the resistance of bypass branch carries out failure current limit to electrical network.
10. the flow controller with failure current limit function according to claim 8, it is characterized in that controlling respectively at two kinds of operating states of described flow controller: (1) normal operating conditions in the occasion that need not trend control: this moment first switch (S1), the 3rd switch (S3) and the 5th switch (S5) closure, current source converter (CSC) multiply by three single-phase transformer (Tr1 with the amplitude that the amplitude of the electric current of current-limiting inductance (Ls) is controlled at line current, Tr2 and Tr3) the above value of high-low pressure no-load voltage ratio, this moment is by three single-phase transformer (Tr1, Tr2 and Tr3) and diode rectifier (Rf1, Rf2, Rf3 or Rf) series circuit that constitutes do not exert an influence to electrical network, current source converter (CSC) is when control current-limiting inductance (Ls) goes up electric current, and compensation flows to the harmonic current of second three phase mains (Ug) from first three phase mains (Us), the fluctuation of active power and reactive power; (2) failure current limit state: after electrical network is short-circuited fault, current-limiting inductance (Ls) is automatically connected into power network line, increased system impedance, thereby reduced the electrical network overcurrent, current source converter (CSC) is to current-limiting inductance (Ls) current discharge simultaneously, to strengthen current limitation effect, when the current value overrate of current-limiting inductance (Ls), first switch (S1), the 3rd switch (S3) and the 5th switch (S5) are disconnected, line voltage distribution will be no longer to the current-limiting inductance charging, and the resistance of bypass branch carries out failure current limit to electrical network.
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| CN109256777A (en) * | 2018-09-20 | 2019-01-22 | 东南大学 | IPFC topology and its Steady state modeling method suitable for double-circuit line power flowcontrol in parallel |
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| CN110137968A (en) * | 2019-05-13 | 2019-08-16 | 南方电网科学研究院有限责任公司 | Harmonic power flow calculation method containing VSC |
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| CN111509788A (en) * | 2020-04-26 | 2020-08-07 | 太原理工大学 | Improved alternating current-direct current hybrid micro-grid with variable topology and control method thereof |
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