CN102624025A - Energy feedback device with composite unit cascade multi-level inverter circuit and control method of energy feedback device - Google Patents
Energy feedback device with composite unit cascade multi-level inverter circuit and control method of energy feedback device Download PDFInfo
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Abstract
The invention relates to an energy feedback device with a composite unit cascade multi-level inverter circuit and a control method of the energy feedback device. The energy feedback device consists of a power unit based on a three-phase control rectifying circuit and a power unit based on a three-phase PWM (pulse width modulation) rectifying circuit, wherein the two power units are in cascade connection. Direct-current voltage of an intermediate direct-voltage circuit of the power unit based on the three-phase control rectifying circuit is stabilized within a safety range by controlling a closed loop of the direct-current voltage of the intermediate direct-voltage circuit of the power unit based on the three-phase control rectifying circuit in a feedback manner, while load feedback energy mainly flows into the intermediate direct-voltage circuit in the power unit based on the three-phase PWM rectifying circuit and is fed into the power grid in a grid integration inverter mode by the three-phase PWM rectifying circuit. The energy feedback device is capable of realizing feedback of load energy to the power grid, so that energy-saving effect is achieved, output voltage is stabilized, and meanwhile, the topological structure of the power units and complexity of control links are simplified to some extent. Further, usage number of insulated gate bi-polar transistors is reduced, manufacturing cost is reduced as well, and the energy feedback device has high economic value.
Description
Technical field
The present invention relates to a kind of energy back feed device and method thereof, especially relate to a kind of recombiner unit cascade connection multi-level inverter circuit and energy back feed device and method thereof.
Background technology
Development along with power electronic technology; High voltage converter is as one of main achievement of Development of Power Electronic Technology; Because of its power factor is high, advantages such as efficient is high, precision is high, speed-regulating range width; In the every field of national economy, be widely used like industries such as metallurgy, mine, petrochemical industry, electric power, and bringing into play more and more important effect.
At present; General high voltage converter belongs to single quadrant frequency converter more on the market; Its main circuit topology to be adopted based on the power cell of control rectifying circuit or phase control rectifier circuit not and constitutes cascade connection multi-level inverter circuit structure; The circuit topological structure figure of conventional stage connection type high-voltage frequency converter is as shown in Figure 1, and is as shown in Figure 2 based on the power cell of control rectifying circuit not, as shown in Figure 3 based on the power cell of phase control rectifier circuit.These conventional stage connection type high-voltage frequency converters can not directly be used for requirement motor four quadrant running, rise fast, the governing system of braking and frequent forward and backward, like express elevator, mining elevator, rolling mill, large-sized gantry planer, winding mechanism tension system and machine tool chief axis drive system etc.When motor deceleration, braking perhaps are with potential energy property load weight to transfer; Motor is in regenerative power generation state; Because do not control, phase control rectifier circuit energy transmission is irreversible, the regenerative electric energy of generation is transferred on the DC side filter capacitor, produces very high pump up voltage; If untimely release will certainly cause the action of frequency converter overvoltage protection or cause the overvoltage of major loop high power device to damage.On the engineering this pump is risen energy and how to consume, wasted the energy greatly, do not meet current energy-conservation demand with heat energy or other form.
The PWM rectification circuit has the advantage that dynamic response is fast, the dc voltage scope is adjustable, and it can satisfy the performance requirement of cascade connection multi-level energy two-way flow.The power cell that the PWM rectifier is used for high voltage converter; Can realize unity power factor rectification operation; Therefore, realize in the high voltage converter that the phase shifting transformer of multiple rectifying can use common Industrial Frequency Transformer to replace, can save complicated phase shift wiring like this.But the PWM rectifier control circuit need detect amount of information such as ac-side current and dc voltage and be used for realizing PWM rectification control algolithm; The cost of detection and controlling unit increases; Make the control of system become very complicated simultaneously, system reliability has also been brought adverse effect.
Summary of the invention
The present invention solves the existing in prior technology technical problem; Provide a kind of and can realize the load energy feedback electrical network; To reach energy-saving effect; It is stable that output voltage values is kept; Can not only satisfy the requirement of motor four quadrant running, a kind of recombiner unit cascade connection multi-level inverter circuit and energy back feed device and method thereof that the phase shifting transformer designing requirement is more simplified.
It is to solve the existing in prior technology technical problem that the present invention also has a purpose; A kind of complexity of having simplified power cell system topological structure and controlling unit is provided; Reduced the usage quantity of insulated gate bipolar transistor; Thereby reduced the cost cost, had a kind of recombiner unit cascade connection multi-level inverter circuit and the energy back feed device and the method thereof of very high economic worth.
Above-mentioned technical problem of the present invention mainly is able to solve through following technical proposals:
A kind of recombiner unit cascade connection multi-level inverter circuit and energy back feed device; It is characterized in that; Comprise the energy feedback unit of two cascades and be arranged between the energy feedback unit some power cells of cascade successively, said power cell all is provided with the energy feedback unit cascade.
At above-mentioned recombiner unit cascade connection multi-level inverter circuit and energy back feed device, said energy feedback unit comprises energy feedback unit A1 and energy feedback unit A4; Said power cell is two, is respectively power cell A2 and power cell A3.
A kind of recombiner unit cascade connection multi-level inverter circuit and energy back feed device; It is characterized in that; Comprise the power cell of two cascades and be arranged between the power cell some energy feedback units of cascade successively, said power cell all is provided with the energy feedback unit cascade.
At above-mentioned recombiner unit cascade connection multi-level inverter circuit and energy back feed device, said power cell comprises power cell A5 and power cell A10; Said energy feedback unit is four, is respectively energy feedback unit A6, energy feedback unit A7, energy feedback unit A8, energy feedback unit A9.
At above-mentioned recombiner unit cascade connection multi-level inverter circuit and energy back feed device; Said energy feedback unit comprises a power cell based on the three-phase PWM rectification circuit; Said power cell based on the three-phase PWM rectification circuit is made up of inverter circuit, middle straight volt circuit and the parallel connection of three-phase PWM rectification circuit, and said inverter circuit all is single-phase H type bridge circuits that insulated gate bipolar transistor constitutes; Said middle straight volt circuit is a direct current electric capacity; Said three-phase PWM rectification circuit is made up of insulated gate bipolar transistor T1, T2, T3, T4, T5, T6; Insulated gate bipolar transistor T1, T3, T5 common collector; Its emitter joins with the three-phase of three phase mains respectively; Insulated gate bipolar transistor T4, T6, T2 common emitter, its collector electrode join with the three-phase of three phase mains respectively.
At above-mentioned recombiner unit cascade connection multi-level inverter circuit and energy back feed device; Said power cell comprises a power cell based on three-phase phase control rectifier circuit; Said power cell based on three-phase phase control rectifier circuit is made up of inverter circuit, middle straight volt circuit and the parallel connection of three-phase phase control rectifier circuit, and said inverter circuit all is single-phase H type bridge circuits that insulated gate bipolar transistor constitutes; Said middle straight volt circuit is a direct current electric capacity; Said three-phase phase control rectifier circuit is made up of thyristor VT1, VT2, VT3, VT4, VT5, VT6; Thyristor VT1, VT3, VT5 common cathode; Its anode joins with the three-phase of three phase mains respectively, and thyristor VT4, VT6, VT2 be anode altogether, and its negative electrode joins with the three-phase of three phase mains respectively.
A kind of recombiner unit cascade connection multi-level inverter circuit and energy feedback method is characterized in that, comprise the selection step of following two kinds of situation:
Select step 1; When capacitor C 1 voltage is lower than Vcon; Voltage detection unit detects information; Feed back to controller, controller sends the PMW control signal, turn-offs through insulated gate bipolar transistor S9a, S8a conducting and insulated gate bipolar transistor S7a, S10a in the inverter circuit of power controlling unit A3; Load feedback electric current is flowed into through the inverse parallel diode of insulated gate bipolar transistor S9a and the inverse parallel diode of insulated gate bipolar transistor S8a through the inverter circuit output port a1 of power cell A3; Be capacitor C 1 charging, the inverter circuit output port b1 from power cell A1 flows out again, and the inverter circuit output port a2 from power cell A4 flows at last; Through the inverse parallel diode of inverse parallel diode, middle straight volt circuit capacitor C 2 and the insulated gate bipolar transistor S8b of insulated gate bipolar transistor S9b and this loop of inverter circuit output port b2 of power cell A4, flow directly into the middle straight volt circuit capacitor C 2 of power cell A2;
Select step 2; When capacitor C 1 voltage stabilizes to Vcon; Controller sends the PMW control signal; Insulated gate bipolar transistor S7a conducting and insulated gate bipolar transistor S8a, S9a, S10a all turn-off in the inverter circuit of power controlling unit A3; Make load feedback electric current flow into inverse parallel diode and the insulated gate bipolar transistor S7a of edge grid bipolar transistor S9a through the inverter circuit output port a1 of power cell A3; Inverter circuit output port b1 from power cell A3 flows out again; Flow into from the inverter circuit output port a2 of power cell A4 at last,, flow directly into the middle straight volt circuit capacitor C 2 of power cell A4 through the inverse parallel diode of inverse parallel diode, middle straight volt circuit capacitor C 2 and the insulated gate bipolar transistor S8b of insulated gate bipolar transistor S9b and this loop of inverter circuit output port b2 of power cell A4.
A kind of recombiner unit cascade connection multi-level inverter circuit and energy feedback method comprise the selection step of following two kinds of situation:
Select step 1; When capacitor C 1 voltage is lower than Vcon; Voltage detection unit detects information; Feed back to controller, controller sends the PMW control signal, turn-offs through insulated gate bipolar transistor S9a, S8a conducting and insulated gate bipolar transistor S7a, S10a in the inverter circuit of power controlling unit A5; Load feedback electric current is flowed into through the inverse parallel diode of insulated gate bipolar transistor S9a and the inverse parallel diode of insulated gate bipolar transistor S8a through the inverter circuit output port a1 of power cell A5; Be capacitor C 1 charging, the inverter circuit output port b1 from power cell A5 flows out again, and the inverter circuit output port a2 from power cell A6 flows at last; Through the inverse parallel diode of inverse parallel diode, middle straight volt circuit capacitor C 2 and the insulated gate bipolar transistor S8b of insulated gate bipolar transistor S9b and this loop of inverter circuit output port b2 of power cell A6, flow directly into the middle straight volt circuit capacitor C 2 of power cell A6;
Select step 2; When capacitor C 1 voltage stabilizes to Vcon; Controller sends the PMW control signal; Insulated gate bipolar transistor S7a conducting and insulated gate bipolar transistor S8a, S9a, S10a all turn-off in the inverter circuit of power controlling unit A5; Make load feedback electric current flow into inverse parallel diode and the insulated gate bipolar transistor S7a of edge grid bipolar transistor S9a through the inverter circuit output port a1 of power cell A5; Inverter circuit output port b1 from power cell A5 flows out again; Flow into from the inverter circuit output port a2 of power cell A6 at last,, flow directly into the middle straight volt circuit capacitor C 2 of power cell A6 through the inverse parallel diode of inverse parallel diode, middle straight volt circuit capacitor C 2 and the insulated gate bipolar transistor S8b of insulated gate bipolar transistor S9b and this loop of inverter circuit output port b2 of power cell A6.
Therefore; The present invention has following advantage: 1, circuit of the present invention will be based on the power cell of three-phase PWM rectification circuit with based on the cascade of power units of three-phase phase control rectifier circuit; With compare based on the cascade of power units multi-level inverter circuit of three-phase phase control rectifier circuit; Circuit of the present invention can be realized the load energy feedback electrical network, and to reach energy-saving effect, it is stable that output voltage values is kept; Circuit of the present invention is used for the requirement that high voltage converter can not only satisfy the motor four quadrant running, the phase shifting transformer designing requirement is more simplified; 2, compare with cascade of power units multi-level inverter circuit based on the three-phase PWM rectification circuit; Circuit of the present invention has been simplified the complexity of power cell system topological structure and controlling unit to a certain extent; And reduced the usage quantity of insulated gate bipolar transistor; Thereby reduced the cost cost, had very high economic worth.
Description of drawings
Fig. 1 is the topology diagram of conventional stage connection type high-voltage frequency converter.
Fig. 2 is based on the three-phase power cell main circuit diagram of control rectifying circuit not.
Fig. 3 is the power cell main circuit diagram based on three-phase phase control rectifier circuit.
Fig. 4 is the power cell main circuit diagram based on the three-phase PWM rectification circuit.
Fig. 5 (a) is a kind of particular circuit configurations figure of embodiment of the invention cascade multi-level inverter circuit.
Fig. 5 (b) is the another kind of particular circuit configurations figure of this embodiment of the invention cascade multi-level inverter circuit.
Fig. 6 (a) is traditional control method schematic diagram for the cascade connection multi-level inverter circuit adopts.
Fig. 6 (b) is the control method schematic diagram when capacitor C 1 voltage is lower than Vcon among Fig. 5 (a).
Fig. 6 (c) is the control method schematic diagram when capacitor C 1 voltage stabilizes to Vcon among Fig. 5 (a).
Fig. 6 (d) is the control method schematic diagram when capacitor C 1 voltage is lower than Vcon among Fig. 5 (b).
Fig. 6 (e) is the control method schematic diagram when capacitor C 1 voltage stabilizes to Vcon among Fig. 5 (b).
Embodiment
Pass through embodiment below, and combine accompanying drawing, do further bright specifically technical scheme of the present invention.
Embodiment:
Below in conjunction with accompanying drawing and practical implementation the present invention is done further elaboration.
Fig. 1 is the topology diagram of conventional stage connection type high-voltage frequency converter; The conventional stage connection type high-voltage frequency converter is made up of phase shifting transformer, power cell and controller; High Level AC Voltage is after phase shifting transformer step-down, phase shift; Three phase mains is provided for respectively each power cell TA1, TA2, TA3, TA4, TB1, TB2, TB3, TB4, TC1, TC2, TC3, the TC4 of ABC three-phase, the output voltage of each power cell forms three-phase sine-wave after the cascade stack, supply power to motor load.
Power cell of the prior art has based on the power cell of three-phase phase control rectifier circuit with based on the power cell of three-phase PWM rectification circuit; Respectively like Fig. 3 and shown in Figure 4, constitute by rectification circuit, middle straight volt circuit, inverter circuit parallel connection based on the power cell of three-phase phase control rectifier circuit with based on the power cell of three-phase PWM rectification circuit.
Rectification circuit based in the power cell of three-phase phase control rectifier circuit is made up of thyristor; Shown in Figure 3 is a kind of practical implementation based on the power cell of three-phase phase control rectifier circuit, and inverter circuit is to adopt 4 insulated gate bipolar transistors to constitute single-phase H type bridge circuit; The middle straight volt circuit is a direct current electric capacity; Rectification circuit is the three-phase phase control rectifier circuit that is made up of thyristor VT1, VT2, VT3, VT4, VT5, VT6; Thyristor VT1, VT3, VT5 common cathode; Its anode joins with the three-phase of three phase mains respectively; Thyristor VT4, VT6, VT2 be anode altogether, and its negative electrode joins with the three-phase of three phase mains respectively.In the power cell based on three-phase phase control rectifier circuit; After middle straight volt circuit capacitance voltage and inverter circuit output voltage signal are delivered to controller; Via controller is handled; Then by the insulated gate bipolar transistor in the controller output signal control inverter circuit, thus the energy of realizing the input power supply carry to load, but can't realize load energy feedback control.
Specifically; In high voltage converter; The secondary side of phase shifting transformer is connected to each power cell TA1, TA2, TA3, TA4, TB1, TB2, TB3, TB4, TC1, TC2, TC3, TC4 through filter reactor respectively, the corresponding power cell of phase shifting transformer, and the input side of power cell is a three-phase phase control rectifier circuit; The middle straight volt circuit is the DC charging part that is made up of dc capacitor, and outlet side is an inverter circuit.The multi-level inverter circuit that cascade of power units forms is connected with controller; The rotating speed of motor and voltage signal are delivered to controller through power cell; Via controller is handled the break-make of 4 insulated gate bipolar transistors in the back output signal controlling inverter circuit, thereby makes inverter circuit export the voltage waveform of corresponding amplitude and frequency.
When motor is operated in motoring condition; The AC power of input power unit becomes direct current power behind three-phase phase control rectifier circuit; Be added on the electric capacity of middle straight volt circuit; Through 4 insulated gate bipolar transistor Q1 ~ Q4 in the controller control inverter circuit, make direct current power become the AC power of certain voltage amplitude, frequency again again.Form the required three-phase sine-wave AC power of motor behind the folded ripple of the output voltage cascade of each power cell inverter circuit, be used for drive motor.This moment, electric energy was transported on the motor through the cascade connection multi-level inverter circuit that cascade of power units forms by the input power supply; Motor operates in first, third quadrant, and the three-phase phase control rectifier circuit of the cascade connection multi-level inverter circuit that power cell forms in the high voltage converter is operated in rectification state always.
When motor is operated in on-position; Because thyristor can not the anti-phase conducting; The rectification circuit that the inverse parallel diode of energy insulated gate bipolar transistor in inverter circuit that the motor brake operation produces constitutes feeds back on the electric capacity of middle straight volt circuit fast, produces the pump up voltage.This energy can adopt the three-phase PWM rectification circuit to realize the energy two-way flow, and energy is fed back to electrical network.
Constitute by insulated gate bipolar transistor based on rectification circuit in the power cell of three-phase PWM rectification circuit; Be illustrated in figure 4 as a kind of practical implementation based on the power cell of three-phase PWM rectification circuit, inverter circuit is to adopt 4 insulated gate bipolar transistors to constitute single-phase H type bridge circuit; The middle straight volt circuit is a direct current electric capacity; The three-phase PWM rectification circuit is made up of insulated gate bipolar transistor T1, T2, T3, T4, T5, T6; Insulated gate bipolar transistor T1, T3, T5 common collector; Its emitter joins with the three-phase of three phase mains respectively; Insulated gate bipolar transistor T4, T6, T2 common emitter, its collector electrode join with the three-phase of three phase mains respectively.
In the power cell based on the three-phase PWM rectification circuit; After the dc capacitor voltage of rectification circuit input side electric current, middle straight volt circuit and inverter circuit output voltage signal are delivered to controller; Via controller is handled, and controls the insulated gate bipolar transistor in rectification circuit and the inverter circuit simultaneously by controller output signal then, thereby realizes the energy two-way flow; Can realize that the energy of importing power supply carries to load, also can realize load energy feedback control.Specifically; In high voltage converter; The secondary side of phase shifting transformer inserts the input side of each power cell TA1, TA2, TA3, TA4, TB1, TB2, TB3, TB4, TC1, TC2, TC3, TC4 respectively through filter reactor; The input side of power cell is the three-phase PWM rectification circuit that is connected and composed according to three-phase bridge circuit by 6 insulated gate bipolar transistor T1 ~ T6, and the middle straight volt circuit is the DC charging part that is made up of dc capacitor, and outlet side is an inverter circuit.The multi-level inverter circuit that cascade of power units forms is connected with controller; Middle straight volt circuit capacitance voltage and power cell input side current signal are delivered to controller; Via controller is handled back output control signal and is used for the break-make of 6 insulated gate bipolar transistors of three-phase PWM rectification circuit in the power controlling unit; Make the three-phase PWM rectification circuit can be operated in rectification state and also can be operated in inverter mode, guarantee the two-way flow control of energy; Simultaneously, after the rotating speed of motor and voltage signal were delivered to controller, via controller was handled the break-make of 4 insulated gate bipolar transistors in the back output signal controlling inverter circuit, thereby makes inverter circuit export the voltage waveform of certain amplitude and frequency.
When motor is operated in motoring condition; Controller is through the break-make of six insulated gate bipolar transistor T1 ~ T6 of three-phase PWM rectification circuit in the power controlling unit; Make power cell be in the rectification operating state; The AC power of input power unit becomes direct current power after Three-Phase PWM Rectifier; Be added on the dc capacitor of middle straight volt circuit, through the break-make of 4 edge grid of inverter circuit bipolar transistor Q1 ~ Q4 in the controller power controlling unit, make direct current power become the AC power of required voltage and frequency again.Form the required three-phase sine-wave AC power of motor behind the folded ripple of the output voltage cascade of each power cell inverter circuit, be used for drive motor.This moment, electric energy was outputed on the motor through the high voltage converter that adopts the cascade of power units multi-level inverter circuit by electrical network, and motor operates in first, third quadrant.
When motor was operated in on-position, the energy that the motor generator operation produces fed back on the electric capacity of middle straight volt circuit through inverter circuit.When the capacitance voltage of middle vertical compression circuit surpasses set point; Control the break-make of six insulated gate bipolar transistor T1 ~ T6 of its three-phase PWM rectification circuit; Make that the three-phase PWM rectification circuit is operated in inverter mode in the power cell; Control the frequency and the phase place of the output current of three-phase PWM rectification circuit simultaneously, guarantee with line voltage unity power factor condition under energy is fed back in the electrical network.The energy that the motor generator operation produces is gone into electrical network through inverter circuit, middle straight volt circuit and the three-phase PWM rectification circuit and the filter reactor feedback that are operated under the inverter mode; This moment, electric energy flowed into electrical network by motor through the high voltage converter of cascade connection multi-level inverter circuit structure, and motor is operated in second, four-quadrant.When motor brake moved, the energy of all cascade unit feedbacks all will feed back in the electrical network through the three-phase PWM rectification circuit of power cell.
The present invention will constitute a kind of new cascade connection multi-level inverter circuit based on the power cell of three-phase phase control rectifier circuit with based on the cascade of power units of three-phase PWM rectification.With compare based on the cascade of power units multi-level inverter circuit of three-phase PWM rectification circuit fully, circuit of the present invention is no matter on circuit topological structure still is control strategy, and is all more simple, reliable.Simultaneously; Cascade connection multi-level inverter circuit of the present invention adopts based on the power cell of three-phase phase control rectifier circuit with based on the cascade of power units of three-phase PWM rectification circuit; Based on the cascade system of the power cell of three-phase phase control rectifier circuit still with reference to traditional based on the three-phase cascade of power units mode of control rectifying circuit not; It is that purpose inserts according to certain phase shift angle that the connected mode of itself and phase shifting transformer remains to reduce Harmonics of Input; And based on the cascade of power units mode of three-phase PWM rectification circuit owing to need not the transformer phase shift, therefore do not have this restrictive condition.
Fig. 5 (a) and Fig. 5 (b) are two kinds of practical implementations of cascade connection multi-level inverter circuit of the present invention.Cascade connection multi-level inverter circuit shown in Fig. 5 (a), wherein, power cell A1, A4 have adopted the power cell based on the three-phase PWM rectification circuit, and all the other are the power cell based on the phase control rectifier circuit.The concrete cascade system of power cell is: A1 power cell inverter circuit output a1 is connected with load; Its inverter circuit output b1 is connected with the inverter circuit output a2 of A2 power cell; And the inverter circuit output b2 of A2 power cell is connected with the inverter circuit output a3 of A3 power cell; And the inverter circuit output b3 of A3 power cell is connected with the inverter circuit output a4 of A4 power cell, and last A4 power cell inverter circuit output b4 is connected with load; In the cascade connection multi-level inverter circuit shown in Fig. 5 (b), power cell A6, A7, A8, A9 have adopted the power cell based on the three-phase PWM rectification circuit, and all the other are the power cell based on the phase control rectifier circuit, and the concrete cascade system of power cell is identical with Fig. 5 (a).During the energy feedback; Part three-phase PWM rectification circuit is operated in inverter mode and can load energy feedback be gone into electrical network in the required power unit; So part adopts the power cell based on the three-phase PWM rectification circuit, can realize the two-way control of energy according to load running under braking characteristic.
Because having only the part power cell in the cascade connection multi-level inverter circuit of the present invention is to adopt the three-phase PWM rectification circuit; For all power cells all adopt the three-phase PWM rectification circuit; Simplified the complexity of power cell system topological structure and controlling unit to a certain extent; And reduced the usage quantity of insulated gate bipolar transistor, reached the purpose of practicing thrift cost; For all power cells all adopt the phase control rectifier circuit, the phase shifting transformer designing requirement is more simplified, load energy can the feed-in electrical network, and can satisfy the AC side input current harmonics and suppress requirement.
Fig. 6 is the control method schematic diagram of cascade connection multi-level inverter circuit; Fig. 6 (a) adopts the schematic diagram of traditional control method for the cascade connection multi-level inverter circuit; Being in the interchange positive half period with load feedback electric current is example; Its inverter circuit output port a1 through power cell flows into; The inverse parallel diode of inverse parallel diode, middle straight volt circuit capacitor C 1 and the insulated gate bipolar transistor S8a of process insulated gate bipolar transistor S9a, from the inverter circuit output port b1 outflow of power cell, the inverter circuit output port a2 of energy feedback unit flows into; The inverse parallel diode of inverse parallel diode, middle straight volt circuit capacitor C 2 and the insulated gate bipolar transistor S8b of process insulated gate bipolar transistor S9b; Flow out from the inverter circuit output port b2 of energy feedback unit, this process has been accomplished load energy feedback to the middle straight volt circuit electric capacity of power cell, and load energy still can't feed back to electrical network.
The control method schematic diagram that is adopted on Fig. 6 (b), (c) circuit topological structure for Fig. 5 of the present invention (a) proposition; Being in the interchange positive half period with load feedback electric current equally is example; The present invention realizes the conducting and the shutoff of insulated gate bipolar transistor in the inverter circuit of power controlling unit A3 automatically through the direct voltage closed-loop control; Make the voltage of vertical compression circuit capacitance C1 be stabilized in steady state value Vcon, concrete control is to being lower than Vcon and two kinds of control procedures are once arranged when capacitor C 1 voltage stabilizes to Vcon when capacitor C 1 voltage:
When capacitor C 1 voltage is lower than Vcon; Voltage detection unit detects information; Feed back to controller; Controller sends the PMW control signal, turn-offs through insulated gate bipolar transistor S9a, S8a conducting and insulated gate bipolar transistor S7a, S10a in the inverter circuit of power controlling unit A3, and load feedback electric current is flowed into through the inverse parallel diode of insulated gate bipolar transistor S9a and the inverse parallel diode of insulated gate bipolar transistor S8a through the inverter circuit output port a1 of power cell A3; Be capacitor C 1 charging; Inverter circuit output port b1 from power cell A3 flows out again, and the inverter circuit output port a2 from power cell A4 flows at last, the inverse parallel diode of inverse parallel diode, middle straight volt circuit capacitor C 2 and the insulated gate bipolar transistor S8b of process insulated gate bipolar transistor S9b and this loop of inverter circuit output port b2 of power cell A4; Flow directly into the middle straight volt circuit capacitor C 2 of power cell A4, shown in Fig. 6 (b).
When capacitor C 1 voltage stabilizes to Vcon; Controller sends the PMW control signal; Insulated gate bipolar transistor S7a conducting and insulated gate bipolar transistor S8a, S9a, S10a all turn-off in the inverter circuit of power controlling unit A3; Make load feedback electric current flow into inverse parallel diode and the insulated gate bipolar transistor S7a of edge grid bipolar transistor S9a through the inverter circuit output port a1 of power cell A3; Inverter circuit output port b1 from power cell A3 flows out again; Inverter circuit output port a2 from power cell A4 flows at last; Through the inverse parallel diode of inverse parallel diode, middle straight volt circuit capacitor C 2 and the insulated gate bipolar transistor S8b of insulated gate bipolar transistor S9b and this loop of inverter circuit output port b2 of power cell A4, flow directly into the middle straight volt circuit capacitor C 2 of power cell A4, shown in Fig. 6 (c).
The control method schematic diagram that is adopted on Fig. 6 (d), the circuit topological structure of 6 (e) for Fig. 5 of the present invention (b) proposition.Concrete control is to being lower than Vcon and two kinds of control procedures are once arranged when capacitor C 1 voltage stabilizes to Vcon when capacitor C 1 voltage:
When capacitor C 1 voltage is lower than Vcon; Voltage detection unit detects information; Feed back to controller; Controller sends the PMW control signal, turn-offs through insulated gate bipolar transistor S9a, S8a conducting and insulated gate bipolar transistor S7a, S10a in the inverter circuit of power controlling unit A5, and load feedback electric current is flowed into through the inverse parallel diode of insulated gate bipolar transistor S9a and the inverse parallel diode of insulated gate bipolar transistor S8a through the inverter circuit output port a1 of power cell A5; Be capacitor C 1 charging; Inverter circuit output port b1 from power cell A5 flows out again, and the inverter circuit output port a2 from power cell A6 flows at last, the inverse parallel diode of inverse parallel diode, middle straight volt circuit capacitor C 2 and the insulated gate bipolar transistor S8b of process insulated gate bipolar transistor S9b and this loop of inverter circuit output port b2 of power cell A6; Flow directly into the middle straight volt circuit capacitor C 2 of power cell A6, shown in Fig. 6 (d).
When capacitor C 1 voltage stabilizes to Vcon; Controller sends the PMW control signal; Insulated gate bipolar transistor S7a conducting and insulated gate bipolar transistor S8a, S9a, S10a all turn-off in the inverter circuit of power controlling unit A5; Make load feedback electric current flow into inverse parallel diode and the insulated gate bipolar transistor S7a of edge grid bipolar transistor S9a through the inverter circuit output port a1 of power cell A5; Inverter circuit output port b1 from power cell A5 flows out again; Inverter circuit output port a2 from power cell A6 flows at last; Through the inverse parallel diode of inverse parallel diode, middle straight volt circuit capacitor C 2 and the insulated gate bipolar transistor S8b of insulated gate bipolar transistor S9b and this loop of inverter circuit output port b2 of power cell A6, flow directly into the middle straight volt circuit capacitor C 2 of power cell A6, shown in Fig. 6 (e).
Specific embodiment described herein only is that the present invention's spirit is illustrated.Person of ordinary skill in the field of the present invention can make various modifications or replenishes or adopt similar mode to substitute described specific embodiment, but can't depart from spirit of the present invention or surmount the defined scope of appended claims.
Claims (8)
1. recombiner unit cascade connection multi-level inverter circuit and energy back feed device; It is characterized in that; Comprise the energy feedback unit of two cascades and be arranged between the energy feedback unit some power cells of cascade successively, said power cell all is provided with the energy feedback unit cascade.
2. recombiner unit cascade connection multi-level inverter circuit according to claim 1 and energy back feed device is characterized in that, said energy feedback unit comprises energy feedback unit A1 and energy feedback unit A4; Said power cell is two, is respectively power cell A2 and power cell A3.
3. recombiner unit cascade connection multi-level inverter circuit and energy back feed device; It is characterized in that; Comprise the power cell of two cascades and be arranged between the power cell some energy feedback units of cascade successively, said power cell all is provided with the energy feedback unit cascade.
4. recombiner unit cascade connection multi-level inverter circuit according to claim 3 and energy back feed device is characterized in that, said power cell comprises power cell A5 and power cell A10; Said energy feedback unit is four, is respectively energy feedback unit A6, energy feedback unit A7, energy feedback unit A8, energy feedback unit A9.
5. according to claim 1 or 3 described recombiner unit cascade connection multi-level inverter circuit and energy back feed devices; It is characterized in that; Said energy feedback unit comprises a power cell based on the three-phase PWM rectification circuit; Said power cell based on the three-phase PWM rectification circuit is made up of inverter circuit, middle straight volt circuit and the parallel connection of three-phase PWM rectification circuit, and said inverter circuit all is single-phase H type bridge circuits that insulated gate bipolar transistor constitutes; Said middle straight volt circuit is a direct current electric capacity; Said three-phase PWM rectification circuit is made up of insulated gate bipolar transistor T1, T2, T3, T4, T5, T6; Insulated gate bipolar transistor T1, T3, T5 common collector; Its emitter joins with the three-phase of three phase mains respectively; Insulated gate bipolar transistor T4, T6, T2 common emitter, its collector electrode join with the three-phase of three phase mains respectively.
6. according to claim 1 or 3 described recombiner unit cascade connection multi-level inverter circuit and energy back feed devices; It is characterized in that; Said power cell comprises a power cell based on three-phase phase control rectifier circuit; Said power cell based on three-phase phase control rectifier circuit is made up of inverter circuit, middle straight volt circuit and the parallel connection of three-phase phase control rectifier circuit, and said inverter circuit all is single-phase H type bridge circuits that insulated gate bipolar transistor constitutes; Said middle straight volt circuit is a direct current electric capacity; Said three-phase phase control rectifier circuit is made up of thyristor VT1, VT2, VT3, VT4, VT5, VT6; Thyristor VT1, VT3, VT5 common cathode; Its anode joins with the three-phase of three phase mains respectively, and thyristor VT4, VT6, VT2 be anode altogether, and its negative electrode joins with the three-phase of three phase mains respectively.
7. recombiner unit cascade connection multi-level inverter circuit according to claim 1 and energy feedback method is characterized in that, comprise the selection step of following two kinds of situation:
Select step 1; When capacitor C 1 voltage is lower than Vcon; Voltage detection unit detects information; Feed back to controller, controller sends the PMW control signal, turn-offs through insulated gate bipolar transistor S9a, S8a conducting and insulated gate bipolar transistor S7a, S10a in the inverter circuit of power controlling unit A1; Load feedback electric current is flowed into through the inverse parallel diode of insulated gate bipolar transistor S9a and the inverse parallel diode of insulated gate bipolar transistor S8a through the inverter circuit output port a1 of power cell A3; Be capacitor C 1 charging, the inverter circuit output port b1 from power cell A3 flows out again, and the inverter circuit output port a2 from power cell A4 flows at last; Through the inverse parallel diode of inverse parallel diode, middle straight volt circuit capacitor C 2 and the insulated gate bipolar transistor S8b of insulated gate bipolar transistor S9b and this loop of inverter circuit output port b2 of power cell A4, flow directly into the middle straight volt circuit capacitor C 2 of power cell A4;
Select step 2; When capacitor C 1 voltage stabilizes to Vcon; Controller sends the PMW control signal; Insulated gate bipolar transistor S7a conducting and insulated gate bipolar transistor S8a, S9a, S10a all turn-off in the inverter circuit of power controlling unit A3; Make load feedback electric current flow into inverse parallel diode and the insulated gate bipolar transistor S7a of edge grid bipolar transistor S9a through the inverter circuit output port a1 of power cell A3; Inverter circuit output port b1 from power cell A3 flows out again; Flow into from the inverter circuit output port a2 of power cell A4 at last,, flow directly into the middle straight volt circuit capacitor C 2 of power cell A4 through the inverse parallel diode of inverse parallel diode, middle straight volt circuit capacitor C 2 and the insulated gate bipolar transistor S8b of insulated gate bipolar transistor S9b and this loop of inverter circuit output port b2 of power cell A4.
8. recombiner unit cascade connection multi-level inverter circuit according to claim 3 and energy feedback method is characterized in that, comprise the selection step of following two kinds of situation:
Select step 1; When capacitor C 1 voltage is lower than Vcon; Voltage detection unit detects information; Feed back to controller, controller sends the PMW control signal, turn-offs through insulated gate bipolar transistor S9a, S8a conducting and insulated gate bipolar transistor S7a, S10a in the inverter circuit of power controlling unit A5; Load feedback electric current is flowed into through the inverse parallel diode of insulated gate bipolar transistor S9a and the inverse parallel diode of insulated gate bipolar transistor S8a through the inverter circuit output port a1 of power cell A5; Be capacitor C 1 charging, the inverter circuit output port b1 from power cell A5 flows out again, and the inverter circuit output port a2 from power cell A6 flows at last; Through the inverse parallel diode of inverse parallel diode, middle straight volt circuit capacitor C 2 and the insulated gate bipolar transistor S8b of insulated gate bipolar transistor S9b and this loop of inverter circuit output port b2 of power cell A6, flow directly into the middle straight volt circuit capacitor C 2 of power cell A6;
Select step 2; When capacitor C 1 voltage stabilizes to Vcon; Controller sends the PMW control signal; Insulated gate bipolar transistor S7a conducting and insulated gate bipolar transistor S8a, S9a, S10a all turn-off in the inverter circuit of power controlling unit A5; Make load feedback electric current flow into inverse parallel diode and the insulated gate bipolar transistor S7a of edge grid bipolar transistor S9a through the inverter circuit output port a1 of power cell A5; Inverter circuit output port b1 from power cell A5 flows out again; Flow into from the inverter circuit output port a2 of power cell A6 at last,, flow directly into the middle straight volt circuit capacitor C 2 of power cell A6 through the inverse parallel diode of inverse parallel diode, middle straight volt circuit capacitor C 2 and the insulated gate bipolar transistor S8b of insulated gate bipolar transistor S9b and this loop of inverter circuit output port b2 of power cell A6.
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| CN110048596A (en) * | 2019-05-27 | 2019-07-23 | 上海能传电气有限公司 | A kind of high-voltage frequency converter braking circuit topological structure |
| US11211879B2 (en) | 2019-09-23 | 2021-12-28 | Rockwell Automation Technologies, Inc. | Capacitor size reduction and lifetime extension for cascaded H-bridge drives |
| US11342878B1 (en) | 2021-04-09 | 2022-05-24 | Rockwell Automation Technologies, Inc. | Regenerative medium voltage drive (Cascaded H Bridge) with reduced number of sensors |
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