CN102354972A - Output-side-switching-based dynamic power flow control device and control method for controllable transformer - Google Patents
Output-side-switching-based dynamic power flow control device and control method for controllable transformer Download PDFInfo
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Abstract
The invention discloses an output-side-switching-based dynamic power flow control device for a controllable transformer. The device consists of the controllable transformer, a power unit, a measurement and control module, a bypass switch, an input voltage transformer, an output voltage transformer and an output current transformer. In a dynamic power flow control method, the switching-on and switching-off of an output side/secondary tapping point of the controllable transformer are controlled by utilizing a fast switching-on/off power electronic switch, a frequency doubling signal is injected into a pulse width modulation signal of the power electronic switch of the controllable transformer by adopting a direct current signal, and the amplitude of the direct current signal and the amplitude and initial phase of the frequency doubling signal in the pulse width modulation signal are changed, thereby changing the phase and amplitude of output voltage of the controllable transformer and realize active power adjustment and passive power adjustment. The switching-on of the tapping point of the controllable transformer is controlled, thereby realizing adjustment control over the dynamic power flow of a power grid. The device and the method have the characteristics of low cost and high dynamic power flow control reliability.
Description
Technical Field
The invention relates to the technical field of flexible power transmission, in particular to a dynamic power flow control device of a controllable transformer based on an output side switch and a control method thereof.
Background
With the interconnection of large power systems and the use of new equipment, the size and complexity of power systems are increased while power generation and transmission are more economical and efficient, and the possibility of operating the power grid at the edge of the stability limit is greatly increased. Therefore, the flexibility of the operation of the power grid, the controllability of the power flow and the stability of the power grid become more and more urgent problems to be solved.
Thus, the demand generated by the operating pressure of the transmission system of the 21 st century can be summarized in the following 3 aspects:
(1) and (3) increasing the power transmission capacity: the demand for transmitting electric energy is increased due to the increase of electricity consumption, and the requirement for improving the transmission capacity is more prominent due to the situation of line construction reduction.
(2) Keeping the system stable: serious power system accidents can cause serious damage to social life in a large power supply area, such as traffic interruption, water and power cut, communication paralysis, damage to financial circulation, damage to a precision machining process, loss of computer information and the like, and the normal power utilization of users is directly influenced. Therefore, how to deliver more power over longer distances in a power system while still maintaining system stability becomes another important task for scheduling operators.
(3) Optimizing the operation of the system: as the number of changes in the power delivery, as determined by changes in operating conditions and power markets, increases rapidly, system control becomes more complex and requires optimization of the power flow of the overall system. Such optimization requires a comprehensive consideration of global operational conditions in larger and larger areas. Furthermore, the electricity market requires the system to control the flow of electricity through a specific "contract path" which requires the grid to have a higher handling capability for power flow control, which is difficult to do in ac transmission systems, since the electricity of each "path" is determined by the electrical characteristics of all other transmission lines.
Aiming at the Flexible Alternating Current Transmission System (FACTS) technology which is generated according to the requirements, the situation that the alternating current transmission network basically depends on mechanical, slow, intermittent and inaccurate control and optimization technical measures in the past is fundamentally changed. The FACTS device controls the voltage, impedance and phase angle on the transmission line simultaneously or selectively, realizes active and reactive power flow control, and provides the capability of fast, continuous and accurate control and power flow optimization for the alternating current transmission network. On the premise of not changing the power generation mode and the network topology structure of the system, the FACTS device can be used for improving the stability of the system, improving the power transmission capacity of the system and relieving the blocking condition of the system to a certain extent.
However, the existing FACTS technology also has great limitations: the FACTS device has high engineering cost and difficult popularization and application; adverse effects exist between the FACTS device and the electrical equipment and other controllers; the FACTS device has large loss; the complicated control structure of the FACTS device and the requirements on corresponding auxiliary equipment such as communication facilities and the like provide more strict requirements on the operation and control of a power grid; additional problems with device failure; the system stability problem caused by the serial connection and the like cause the application of the system in the power grid to be greatly limited.
Disclosure of Invention
In view of the above problems, an object of the present invention is to provide a dynamic power flow control apparatus for a controllable transformer based on an output side switch, which is based on the characteristics of low cost and high reliability of the controllable transformer of the output side switch, and a control method thereof. The method improves the tide regulation, the power transmission capacity, the system stability, the reliability and the like of the power system, so that the power grid of China really becomes a strong intelligent power grid.
The technical solution of the invention is as follows:
the utility model provides a controllable transformer's dynamic trend controlling means based on output side switch which characterized in that this dynamic trend controlling means's constitution includes controllable transformer, power unit, measurement and control module, bypass switch, input voltage transformer, output voltage transformer and output current transformer:
the secondary side of the controllable transformer comprises a main joint and a positive tap and a negative tap;
the power unit is connected between the positive tap and the negative tap of the secondary side of the controllable transformer and an output power supply or a load, the power unit consists of a first group of power tubes, a second group of power tubes, a filter inductor and a filter capacitor, the first group of power tubes and the second group of power tubes are respectively formed by connecting 2 insulated gate bipolar transistors (IGBT for short) in series in an opposite direction, one end of the first group of power tubes and one end of the second group of power tubes are respectively connected with the positive tap and the negative tap of the secondary side of the controllable transformer, the other ends of the first group of power tubes and the second group of power tubes are connected with one end of the filter inductor, the other end of the filter inductor is connected with the output power supply or the load, the filter capacitor is connected between the positive tap and the negative tap of the secondary side of the controllable transformer, the control ends of the first group of power tubes and the second group of power tubes are connected with the corresponding control ends of the measurement and control module;
the bypass switch is connected between a main joint of the secondary side of the controllable transformer and an output power supply or a load:
one side of the input voltage transformer is connected with a primary side input voltage main circuit of the controllable transformer, and a voltage signal output end is connected with a voltage signal input port of the measurement and control module;
one side of the output voltage transformer is connected with a secondary output voltage main circuit of the controllable transformer, and the output end of the output voltage transformer is connected with a voltage signal input port of the measurement and control module;
the output current transformer is connected in series in an output main circuit of the controllable transformer, and a current signal output end of the output current transformer is connected with a current signal input port of the measurement and control module;
the control signal output end of the measurement and control module is respectively connected with the control ends of the first group of power tubes and the second group of power tubes of the power unit and the control end of the bypass switch, and the measurement and control module is connected with an upper computer.
The measuring and controlling module is a digital signal processor, a singlechip or a computer.
A method for controlling dynamic power flow by using the dynamic power flow control device of the controllable transformer based on the output side switch is characterized by comprising the following specific steps:
1) the measurement and control module initializes the measurement and control, sends a signal to the bypass switch to turn off the bypass switch, and receives a given value Q of the reactive power given by the upper computer0And given value of active power P0；
2) The measurement and control module receives input voltage V respectively input by the input voltage transformer 5, the output voltage transformer and the output current transformerinAn output voltage VoutThe output current I, the included angle beta between the output voltage and the output current, and the voltage V of the remote power gridElectric network 2Information and transmission line reactance value L:
Velectric network 2＝V2sin(ω0t + α), wherein V2Is its amplitude, α is its phase angle;
calculating the actual active power P and the actual reactive power Q according to the following formulas:
3) according to active power P0And reactive power Q0Calculating the phase angle theta and amplitude V of the output voltage of the controllable transformer according to the following formulaout：
Wherein: l is the reactance value of the transmission line;
ω0an angular frequency corresponding to 50 or 60 Hz;
V2is a voltage V of a remote networkElectric network 2The amplitude of (d);
4) calculating the pulse width modulation duty ratio D:
firstly, according to the input voltage V of the controllable transformerinPhase angle theta and amplitude V of output voltageoutCalculating the DC signal coefficient K in the pulse width modulation signal of the insulated gate bipolar transistor according to the following formula0A coefficient K of a frequency-doubled signal2And initial phase
Wherein: v1For a controllable transformer input voltage VinN is the tap transformation ratio of the controllable transformer;
② according to the DC signal coefficient K0A coefficient K of a frequency-doubled signal2And its initial phaseThe pulse width modulation duty cycle D is calculated according to:
5) controlling the conduction of the insulated gate bipolar transistor according to the pulse width modulation duty ratio D and a pulse width modulation signal of the insulated gate bipolar transistor;
6) and repeating the steps 2) to 5), and realizing the regulation and control of the dynamic power flow of the power grid by controlling the conduction of the insulated gate bipolar transistor according to the obtained pulse width modulation duty ratio D.
When the power unit works, the bypass switch is turned off, and when the power tube quits working, the bypass switch is turned on.
The control principle of the power and the modulation factor is derived as follows:
the IGBT pulse width modulation signal D is:
in the above formula, D is more than or equal to 0 and less than or equal to 1, K0Is the amplitude of the DC signal, K2Is a double frequency signal amplitude, omega0For the fundamental frequency of the input voltage of the power grid,
is the initial phase angle of the double frequency signal;
setting input voltage V of controllable transformerinComprises the following steps:
Vin＝V1sin(ω0t) (2)
in the above formula, V1The peak value of the input voltage of the controllable transformer;
setting the transformation ratio of positive and negative taps at the output side (secondary side) of the controllable transformer to be (1+ N) and (1-N), respectively, the output voltage V of the controllable transformeroutComprises the following steps:
Vout＝Vin *(1+N)(1-D)+(1-N)D (3)
as a result of this, the number of the,
filtering out 3-order harmonic wave to obtain output voltage containing only fundamental wave quantity
Wherein,
A＝1+N-2NK0，B＝NK2 (6)
therefore, the amplitude and the initial phase angle theta of the output voltage of the controllable transformer are related to the amplitude of the IGBT pulse width modulation direct current signal, the amplitude of the double frequency signal and the initial phase angle thereof;
the initial phase angle of the output voltage is:
(5) the formula shows that the amplitude of the output voltage of the controllable transformer is mainly determined by the amplitude K of the direct current signal in the IGBT pulse width modulation signal0；
Suppose that a power grid 1 is connected with a power transmission line through a controllable transformer to transmit power to a power grid 2, the inductive reactance of the power transmission line is j omega L, and the voltage of a bus end of the power grid 2 is as follows:
Velectric network 2＝V2sin(ω0t+α) (8)
The relationship between the active power P and the reactive power Q of the transmission line in which the controllable transformer is located and the output voltage of the controllable transformer is as follows:
in the above formula, the active power, the reactive power and the voltage are calculated by adopting the per-unit value, and the voltage amplitude is about 1.0. From the two formulas (9) and (10), the active power P is mainly related to the initial phase angle theta of the fundamental frequency component of the output voltage of the controllable transformer, and the reactive power Q is mainly related to the amplitude of the output voltage of the controllable transformer; that is, the transmission line active power P is mainly related to the amplitude K of the IGBT pulse width modulation frequency-doubled signal2And its initial phase angle
The reactive power Q is mainly related to the amplitude K of the DC signal in the IGBT pulse width modulation signal0(ii) related;
therefore, the amplitude K of the double frequency signal in the IGBT pulse width modulation signal2Angle with initial phase
And the amplitude K of the DC signal0The regulation of the power can realize the regulation of active power and reactive power; because the tap switch-on of the controllable transformer is controlled, the IGBT capacity of the power tube for controlling the tap switch of the controllable transformer is only one part of the capacity of the controllable transformer, therefore, the cost is low, and the active power and the reactive power with low cost and high reliability are controlled.
The invention relates to a dynamic power flow control method of a controllable transformer based on an output side switch, which is used for controlling the active power and the reactive power of a power transmission line where the controllable transformer is located according to the power grid requirement; the on-off of the secondary side tap of the controllable transformer is controlled by the IGBT, a frequency doubling signal is injected into a pulse width modulation signal direct current signal of the IGBT, and the phase and amplitude of the output voltage of the controllable transformer are changed by changing the amplitude of the direct current signal in the pulse width modulation signal and the amplitude and initial phase of the frequency doubling signal.
The invention has the following characteristics:
1. the power tube only needs to control the conduction of the controllable transformer tap, so the cost is low, and the problem of high cost of the conventional FACTS device is solved;
2. the voltage amplitude of the ordinary controllable transformer can be controlled only by adjusting the tap thereof, and the invention injects a double-frequency signal into the IGBT pulse width modulation signal of the power tube, thereby realizing the deviation of the input voltage angle and realizing the control of active power;
3. the invention has the characteristics of low cost and high control reliability of the dynamic trend.
Drawings
Fig. 1 is a schematic structural diagram of a dynamic power flow control device of a controllable transformer based on an output-side switch according to the present invention.
Fig. 2 is a schematic diagram of the dynamic power flow control of the controllable transformer based on the output side switch according to the present invention.
Fig. 3 is a flow chart of the algorithm of the dynamic power flow control of the present invention.
Fig. 4 is a simulation diagram of the dynamic power flow phase control of the controllable transformer based on the output side switch.
Detailed Description
The present invention will be further described with reference to the following examples and drawings, but the scope of the present invention should not be limited thereto.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a dynamic power flow control device of a controllable transformer based on an output-side switch according to the present invention. As can be seen from the figure, a dynamic power flow control device for a controllable transformer based on an output side switch includes: controllable transformer 1, power unit 2, measurement and control module 3, bypass switch 4, input voltage transformer 5, output voltage transformer 6 and output current transformer 7 constitute:
the secondary side of the controllable transformer 1 comprises a main joint 12 and a positive tap 13 and a negative tap 11;
the power unit 2 consists of a first group of power tubes S1A second group of power tubes S2Filter inductor LfAnd a filter capacitor CfThe first group of power tubes S of the power unit 21And a second group of power tubes S2Each of the power transistors comprises 2 insulated gate bipolar transistors which are connected in series in an opposite direction, and the power transistors S of the first group1And a second group of power tubes S2One end of each of the first and second groups of power transistors S is connected to a positive tap 13 and a negative tap 11 of the secondary side of the controllable transformer 1, respectively1And a second group of power tubes S2The other end of the filter inductor L is connected with the filter inductor LfOne terminal of the filter inductor LfThe other end of the filter capacitor C is connected with the output power supply or the loadfConnected between a positive tap 13 and a negative tap 11 of the secondary side of said controllable transformer 1, said first set of power transistors S1And a second group of power tubes S2The control end of the control module is connected with the corresponding control end of the measurement and control module 3;
the bypass switch 4 is connected between the main joint 12 of the secondary side of the controllable transformer 1 and an output power supply or a load;
one side of the input voltage transformer 5 is connected with a primary side input voltage main circuit of the controllable transformer, and a voltage signal output end is connected with a voltage signal input port of the measurement and control module 3;
one side of the output voltage transformer 6 is connected with a secondary output voltage main circuit of the controllable transformer, and the output end of the output voltage transformer is connected with a voltage signal input port of the measurement and control module 3;
the output current transformer 7 is connected in series in an output main circuit of the controllable transformer, and the current signal output end of the output current transformer is connected with the current signal input port of the measurement and control module 3;
the control signal output end of the measurement and control module 3 is respectively connected with the first group of power tubes S of the power unit1And a second group of power tubes S2The control end of the bypass switch 4 is connected with the control end of the bypass switch, and the measurement and control module 3 is connected with an upper computer.
The measuring and controlling module 3 is a digital signal processor, a singlechip or a computer.
For the system shown in fig. 2, the work flow of the dynamic power flow control of the controllable transformer based on the output-side switch is shown in fig. 3, and a method for controlling the dynamic power flow of the power grid by using the dynamic power flow control device of the controllable transformer based on the output-side switch includes the following specific steps:
1) the measurement and control module 3 initializes the measurement and control, sends a signal to the bypass switch 4 to turn off the bypass switch, and receives a given value Q of the reactive power given by the upper computer0And given value of active power P0；
2) The measurement and control module 3 receives input voltages V respectively input by the input voltage transformer 5, the output voltage transformer 6 and the output current transformer 7inAn output voltage VoutThe output current I, the included angle beta between the output voltage and the output current, and the voltage V of the remote power gridElectric network 2Information and transmission line reactance value L:
Velectric network 2＝V2sin(ω0t + α), wherein V2Is its amplitude, α is its phase angle; the measured active power P,Reactive power Q:
3) according to active power P0And reactive power Q0Calculating the phase angle theta and amplitude V of the output voltage of the controllable transformer according to the following formulaout：
Wherein: l is the reactance value of the transmission line;
ω0an angular frequency corresponding to 50 or 60 Hz;
V2is a voltage V of a remote networkElectric network 2The amplitude of (d);
4) calculating the pulse width modulation duty ratio D:
firstly, according to the input voltage V of the controllable transformerinPhase angle theta and amplitude V of output voltageoutCalculating the DC signal coefficient K in the pulse width modulation signal of the insulated gate bipolar transistor according to the following formula0A coefficient K of a frequency-doubled signal2And initial phase
Wherein: v1Is controllably variableVoltage transformer input voltage VinN is the tap transformation ratio of the controllable transformer;
② according to the DC signal coefficient K0A coefficient K of a frequency-doubled signal2And its initial phase
The pulse width modulation duty cycle D is calculated according to:
5) controlling the conduction of the insulated gate bipolar transistor according to the pulse width modulation duty ratio D and a pulse width modulation signal of the insulated gate bipolar transistor;
6) and repeating the steps 2) to 5), and realizing the regulation and control of the dynamic power flow of the power grid by controlling the conduction of the insulated gate bipolar transistor according to the obtained pulse width modulation duty ratio D.
Sampling voltage and current by a DSP controller, calculating active power and reactive power of a transmission line, calculating an initial phase angle and an amplitude value of output voltage of the controllable transformer according to the formulas (9) and (10) and calculating a direct current component K in a corresponding IGBT pulse width modulation signal according to the formulas (5) and (6) according to the active power and reactive power values given by an upper computer0Two frequency doubling signal amplitude K2Angle with initial phase
Thereby deriving the IGBT pulse width modulated signal D. And turning off the bypass switch, and conducting and controlling the IGBT power tube by the IGBT pulse width modulation signal D to enable the controllable transformer to output corresponding voltage with phase offset, wherein a high-frequency switching signal generated when the IGBT of the power tube works is filtered by the filtering loop. The active power and the reactive power are subjected to closed-loop control through the difference between the actually measured active power and reactive power and a given value, and the IGBT pulse width modulation signal D is adjusted to ensure that the actually measured active power and reactive powerAnd the current of the transmission line is controlled according to the set value.
When the IGBT works, due to the fact that the pulse width modulation signals of the IGBT contain frequency doubling signals, third harmonic waves can be generated in a transmission line, although harmonic wave quantity is not large, the third harmonic waves can be filtered according to needs, and therefore the quality of output voltage of the controllable transformer is higher.
FIG. 4 shows that N is 0.15, K0＝K2＝0.5，
Time-controlled transformer output voltage simulation diagram, V in the diagramout1I.e. the fundamental wave of the output voltage, VinFor inputting a supply voltage, Vout3The third harmonic contained in the output voltage. From the simulation of fig. 4, it is seen that the output voltage is phase-shifted by 4.25 degrees, and the output amplitude is unchanged, which is consistent with the above analysis result.
And when the dynamic power flow control system quits the operation, the measurement and control module 3 sends out an instruction to turn off the IGBT (insulated gate bipolar transistor) of the power tube and turn on the bypass switch 4, so that the dynamic power flow control quits the operation.
Claims (3)
1. A dynamic power flow control device of a controllable transformer based on an output side switch is characterized by comprising: controllable transformer (1), power unit (2), measurement and control module (3), bypass switch (4), input voltage transformer (5), output voltage transformer (6) and output current transformer (7) constitute:
the secondary side of the controllable transformer (1) comprises a main joint (12) and a positive tap (13) and a negative tap (11);
the power unit (2) is composed of a first group of power tubes (S)1) A second group of power tubes (S)2) Filter inductor (L)f) And a filter capacitor (C)f) The first group of power tubes (S) of the power unit (2)1) And a second group of power tubes (S)2) Each composed of 2 insulated gate bipolar transistors connected in reverse series, the first group of power tubes (S)1) And a second group of power tubes (S)2) One end of each of the first and second groups of power tubes (S) is connected to a positive tap (13) and a negative tap (11) of the secondary side of the controllable transformer (1), respectively1) And a second group of power tubes (S)2) Another end of (L) is connected with the filter inductor (L)f) One terminal of the filter inductor (L)f) And the other end of the filter capacitor (C) is connected with the output power supply or the loadf) Connected between a positive tap (13) and a negative tap (11) of the secondary side of said controllable transformer (1), said first set of power transistors (S)1) And a second group of power tubes (S)2) The control end of the measuring and controlling module (3) is connected with the corresponding control end of the measuring and controlling module;
the bypass switch (4) is connected between a main joint (12) of the secondary side of the controllable transformer (1) and an output power supply or a load;
one side of the input voltage transformer (5) is connected with a primary side input voltage main circuit of the controllable transformer, and a voltage signal output end is connected with a voltage signal input port of the measurement and control module (3);
one side of the output voltage transformer (6) is connected with a secondary output voltage main circuit of the controllable transformer, and a voltage signal output end is connected with a voltage signal input port of the measurement and control module (3);
the output current transformer (7) is connected in series in an output main circuit of the controllable transformer, and the current signal output end of the output current transformer is connected with the current signal input port of the measurement and control module (3);
the control signal output end of the measurement and control module (3) is respectively connected with the first group of power tubes (S) of the power unit1) And a second group of power tubes (S)2) The control end of the bypass switch (4) is connected with the control end of the bypass switch, and the measurement and control module (3) is connected with an upper computer.
2. The dynamic power flow control device of the controllable transformer based on the output side switch as claimed in claim 1, characterized in that the measuring and controlling module (3) is a digital signal processor, a single chip or a computer.
3. A method for controlling the dynamic power flow of a power grid by using the device for controlling the dynamic power flow of a controllable transformer based on an output side switch as claimed in claim 1, wherein the method comprises the following specific steps:
1) the measurement and control module (3) initializes the measurement and control, sends a signal to the bypass switch (4) to turn off the bypass switch, and receives a given value Q of the reactive power given by the upper computer0And given value of active power P0；
2) The measurement and control module (3) receives input voltage V respectively input by the input voltage transformer (5), the output voltage transformer (6) and the output current transformer (7)inOutput voltage voutThe output current I, the included angle beta between the output voltage and the output current, and the voltage V of the remote power gridElectric network 2Information and transmission line reactance value L:
Velectric network 2＝V2sin(ω0t + α), wherein V2Is its amplitude, α is its phase angle;
calculating the actual active power P and the actual reactive power Q according to the following formulas:
3) according to active power P0And reactive power Q0Calculating the phase angle theta and amplitude V of the output voltage of the controllable transformer according to the following formulaout：
Wherein: l is the reactance value of the transmission line;
ω0an angular frequency corresponding to 50 or 60 Hz;
V2is a voltage V of a remote networkElectric network 2The amplitude of (d);
4) calculating the pulse width modulation duty ratio D:
firstly, according to the input voltage V of the controllable transformerinPhase angle theta and amplitude V of output voltageoutCalculating the DC signal coefficient K in the pulse width modulation signal of the insulated gate bipolar transistor according to the following formula0A coefficient K of a frequency-doubled signal2And initial phase
Wherein: v1For a controllable transformer input voltage VinN is the tap transformation ratio of the controllable transformer;
② according to the DC signal coefficient K0A coefficient K of a frequency-doubled signal2And its initial phase
The pulse width modulation duty cycle D is calculated according to:
5) controlling the conduction of the insulated gate bipolar transistor according to the pulse width modulation duty ratio D and a pulse width modulation signal of the insulated gate bipolar transistor;
6) and repeating the steps 2) to 5), and realizing the regulation and control of the dynamic power flow of the power grid by controlling the conduction of the insulated gate bipolar transistor according to the obtained pulse width modulation duty ratio D.
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| CN109088410A (en) * | 2018-08-16 | 2018-12-25 | 苏州大学 | A kind of direct flow controller of 360 ° of orthogonal types of phase and its working method |
| TWI713293B (en) * | 2018-03-14 | 2020-12-11 | 大陸商萬民半導體（澳門）有限公司 | Multifunction three quarter bridge |
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| CN202206140U (en) * | 2011-09-13 | 2012-04-25 | 上海交通大学 | Dynamic power flow control device for output side switch controlled transformer |
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2011
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| JPH0974681A (en) * | 1994-07-25 | 1997-03-18 | Hitachi Ltd | Power flow controller |
| CN101390267A (en) * | 2006-02-23 | 2009-03-18 | Abb研究有限公司 | Control of power flow in a transmission line |
| CN101447671A (en) * | 2008-12-08 | 2009-06-03 | 中国电力科学研究院 | Automatic integrating and adjusting method for flow data |
| CN202206140U (en) * | 2011-09-13 | 2012-04-25 | 上海交通大学 | Dynamic power flow control device for output side switch controlled transformer |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105591384A (en) * | 2014-11-14 | 2016-05-18 | 国家电网公司 | Distributed synchronization serial compensator |
| CN105591384B (en) * | 2014-11-14 | 2018-12-04 | 国家电网公司 | A kind of distributed synchronization series compensator |
| TWI713293B (en) * | 2018-03-14 | 2020-12-11 | 大陸商萬民半導體（澳門）有限公司 | Multifunction three quarter bridge |
| CN109088410A (en) * | 2018-08-16 | 2018-12-25 | 苏州大学 | A kind of direct flow controller of 360 ° of orthogonal types of phase and its working method |
| CN109088410B (en) * | 2018-08-16 | 2024-04-12 | 法瑞电气(南通)有限公司 | Phase 360-degree orthogonal direct power flow controller and working method thereof |
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| CN102354972B (en) | 2013-08-07 |
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