CN102427299A - Multifunctional large-power power electronic current transformer - Google Patents
Multifunctional large-power power electronic current transformer Download PDFInfo
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Abstract
The invention provides a multifunctional large-power power electronic current transformer. The power electronic current transformer comprises a three-phase alternating current power source, a large-power power electronic current transformer as well as a controller and an SVC (switching virtual circuit) of the large-power power electronic current transformer. The large-power power electronic current transformer comprises a three-phase reactor, a three-phase all-controlling rectifier, a direct current transforming circuit, a three-phase or single-phase all-controlling inverter, and a three-phase or single-phase load or power grid. The controller is connected with a current and voltage sensor group and a driving circuit. The invention further provides a controller and a logic control method. The power electronic current transformer has the advantages that the all-controlling rectifier capable of compensating small-capacity reactive power at a power grid side of the large-power current transformer or the large-power power electronic transformer is combined with a large-capacity SVC by using a hybrid reactive compensation structure; and therefore, the power electronic current transformer has a plurality of functions of transmitting active energy, compensating the reactive power and eliminating the power grid harmonic wave.
Description
Technical field
The present invention relates to electronic power convertor, particularly a kind of employing mixed type reactive power compensation structure, have transmit meritorious energy, compensation network is idle, eliminate multi-functional electronic power convertors such as mains by harmonics.
Background technology
Along with power system development, various impact loads such as industrial arc, electric locomotive, rolling mill etc. make that voltage fluctuation is frequent on the electrical network, and a large amount of semiconductor rectifier equipment causes harmonic wave in electrical network, make quality of power supply variation.A large amount of appearance of new sensitive equipment (like semiconductor manufacturing factory etc.) are had higher requirement to the quality of power supply again.Along with the development of power electronic technology, the high-power converter of various topological classifications has used the every field in national economy widely, and is bringing into play more and more important effect simultaneously.
For ensureing the requirement of the electrical network quality of power supply, all kinds of SVCs (SVC), static reacance generator (SVG), high-power electric and electronic transformer devices such as (SST) arise at the historic moment.But current high-power converter, high-power electric and electronic transformer, SVC, SVG exist shortcoming and defect separately:
1, the high-power converter function ratio is more single; The residual capacity of current transformer is a lot of under many circumstances; Promptly excised behind electric motor starting like high-power converter in the alternating current machine dragging system; Be in idle state, its specified power capacity can not be fully utilized, this has caused current transformer waste in use.
2, in recent years, high-power electric and electronic transformer (SST) has obtained paying close attention to widely, but electric power electric transformer is when transmitting meritorious energy, and reckons without jumbo reactive power compensation.Make electric power electric transformer function and capacity and be underutilized.
Even 3, most high-power converter and powerful electric power electric transformer possess the function of reactive power compensation, owing to self at first will ensure the transmission of meritorious energy, what compensated is idle also quite limited, and practical value is not high.
4, the conducting of TCR type SVC through the control thyristor constantly control flows cross the electric current of reactor; Thereby follow the tracks of the idle power of load fast; And it is asymmetric through phase-splitting control compensation three-phase; Absorb harmonic wave with the ac filter device of its coupling, be a kind of technology maturation, cost performance height, have product than the large compensation capacity.But the response time is slower, and is low to the improvement rate of flickering, even causes the flickering aggravation sometimes.TSC type SVC has adopted capacitor group switching mode, can realize idle big capacity classification adjusting, and its advantage is that compensating circuit is simple in structure, and cost is low.But this mode still exists compensation speed slow, because the switching of capacitor is that classification is carried out, the reactive power compensation amount of generation also is a phase step type, can make electrical network overcompensation or undercompensation state occur again.
5, SVG adopts the full-control type device, and response speed is fast, and it is effective to suppress flickering, but does not have the function of transmitting meritorious energy.
Summary of the invention
The objective of the invention is to overcome above-mentioned defective; A kind of function and capacity that can make full use of current transformer is provided; The power factor of improvement system improves the inhibition effect to flickering, has to transmit meritorious energy, compensation network is idle and eliminates the multi-functional electronic power convertor of mains by harmonics.
For achieving the above object; A kind of multifunctional high-power electronic power convertor provided by the invention; Comprise three-phase alternating-current supply, high-power electric and electronic current transformer and controller and SVC; Said controller is provided with coupled electric current, voltage sensor group and drive circuit, and the input parallel connection of said SVC inserts on the electrical network in said three-phase alternating-current supply exit;
Said high-power electric and electronic current transformer comprises three-phase reactor, three-phase fully-controlled type rectification stage, DC transfer circuit, three-phase or single-phase full-control type inverse cascade and three-phase or single-phase load or electrical network; Wherein, The input of said three-phase reactor is parallel on the electrical network in said three-phase alternating-current supply exit; The output of said three-phase reactor is connected to the input of said three-phase fully-controlled type rectification stage; The output of said three-phase fully-controlled type rectification stage is connected to the input of said three-phase or single-phase full-control type inverse cascade through said DC transfer circuit, and the output of said three-phase or single-phase full-control type inverse cascade is connected to said three-phase or single-phase load or electrical network;
Said electric current, voltage sensor group comprise the first current sensor group, the second current sensor group, voltage sensor, direct voltage transducer and DC current sensor; Wherein, The input of the said first current sensor group is connected on the input electrical network of said three-phase reactor; The input of the said second current sensor group is connected on the input electrical network of said other loads of electrical network; The input of said voltage sensor is parallel on the electrical network in said three-phase alternating-current supply exit; The input of said direct voltage transducer and the input of DC current sensor are connected to said DC transfer circuit, and the output of the said first current sensor group, the second current sensor group, voltage sensor, direct voltage transducer and DC current sensor is connected with said controller respectively;
Said drive circuit comprises that first drive circuit, second drive circuit, the 3rd drive circuit and 4 wheel driven move circuit; Wherein, Said first drive circuit, second drive circuit, the 3rd drive circuit, moving each input of circuit of 4 wheel driven are connected with said controller respectively; The output of said first drive circuit is connected to said three-phase fully-controlled type rectification stage; The output of said second drive circuit is connected to said SVC, and the output of said the 3rd drive circuit is connected to said three-phase or single-phase full-control type inverse cascade, and the output of the moving circuit of said 4 wheel driven is connected to said DC transfer circuit;
The load feedback signal of said three-phase or single-phase load or electrical network output is connected with said controller;
The logic control step that said controller is carried out comprises:
The first step: initialization system;
Second step: start the first current sensor group, voltage sensor group, the second current sensor group, direct voltage sensor groups, DC current sensor group and load feedback signal;
The 3rd step: the DC transfer circuit control task that the control task of registration three-phase fully-controlled type rectification stage and SVC, registration are isolated, registration three-phase or single-phase full-control type inverter control task;
The 4th step: get into the reactive power compensation control that three-phase fully-controlled type rectification stage matches with SVC:
The 1st step: carry out instantaneous reactive through the second current sensor group, voltage sensor group and detect, obtain the idle amount in the network system;
The 2nd step: the input current that detects three-phase fully-controlled rectification stage AC side through the first current sensor group; And judge whether the residual capacity of three-phase fully-controlled rectification stage satisfies the working value of compensating reactive power; Be that the three-phase fully-controlled rectification stage is used for the residual capacity compensating reactive power and sets the least residue capacity
If not, only idle by the SVC compensation network, three-phase fully-controlled type rectification stage only to the meritorious energy of DC transfer circuit transmission of back level isolation or non-isolation, adopts the unity power factor operation, does not provide any idle to electrical network, carries out for the 5th step;
If carry out next step;
The 3rd step: the idle amount of the residual capacity of judging three-phase fully-controlled type rectification stage in whether can the full remuneration network system, if then idle by three-phase fully-controlled type rectification stage compensation network fully, SVC does not work, and carries out for the 5th step;
If not; Then by the idle amount that cooperate compensation network of three-phase fully-controlled type rectification stage with SVC; Promptly most of idle by in the SVC compensation network system remains idle amount part and afforded redress by three-phase fully-controlled type rectification stage, and three-phase fully-controlled type rectification stage is worked under non-unity power factor; Its satisfy that the back level is isolated or the meritorious energy requirement of DC transfer circuit of non-isolation in, offer certain idle of electrical network;
The 4th step: the reactive power compensation control that output three-phase fully-controlled type rectification stage matches with SVC is given, and controls the control of given execution to DC transfer circuit and the three-phase or the single-phase full-control type inverse cascade of three-phase fully-controlled type rectification stage, isolation in the current transformer according to the reactive power compensation that above-mentioned three-phase fully-controlled type rectification stage matches with SVC:
The 5th step: whether system shuts down, if carry out next step; If, do not return for the 4th step;
The 6th step: finish.
Multifunctional high-power electronic power convertor of the present invention in wherein said the 4th step, comprises the control of three-phase fully-controlled type rectification stage:
4-1 step: obtain the magnitude of voltage, the current value in the three phase network that the second current sensor group is sampled of input current value in the three-phase reactor that the first current sensor group collected, three phase network that the voltage sensor group is collected, the magnitude of voltage of each Cascade H bridge DC side of the former limit of transformer that the direct voltage sensor groups is collected;
The 4-2 step: calculate the given of active current and reactive current;
The 4-3 step: vector control, the meritorious amount of piece-rate system and idle amount;
The 4-4 step: output control pulse to three-phase fully-controlled type rectification stage;
The 4-5 step: finish.
Multifunctional high-power electronic power convertor of the present invention in wherein said the 4th step, comprises the control of the DC transfer circuit of isolating:
4-1 step: obtain the magnitude of voltage of the transformer secondary H bridge DC side output that the direct voltage sensor groups collected, obtain the current value of the transformer secondary H bridge DC side output that the DC current sensor group collected;
The 4-2 step: the error amount that calculates dc voltage; Calculate the power output of each bridge and the error of average power;
The 4-3 step: adopt voltage, the two closed-loop controls of power, calculate the phase shifting angle of the DC transfer circuit of isolating;
The 4-4 step: output control pulse to the DC transfer circuit of isolating:
The 4-5 step: finish.
Multifunctional high-power electronic power convertor of the present invention in wherein said the 4th step, comprises the control of three-phase or single-phase full-control type inverse cascade:
The 4-1 step: the feedback signal of obtaining load;
The 4-2 step: vector control or direct torque control are used to exchange transmission, and vector control or direct Power Control are used for grid-connected current control;
The 4-3 step: output control pulse to three-phase fully-controlled type inverter;
The 4-4 step: finish.
Multifunctional high-power electronic power convertor of the present invention, wherein said DC transfer circuit is the DC transfer circuit of isolation or non-isolation.
The advantage and the good effect of multifunctional high-power electronic power convertor of the present invention are: owing to be provided with high-power electric and electronic current transformer and SVC and controller thereof; Controller is provided with electric current, voltage sensor group and drive circuit; The full-control type rectification stage and the jumbo SVC that high-power converter or high-power electric and electronic transformer grid side can be compensated the low capacity reactive power combine; Adopt mixed type reactive power compensation structure, therefore have and transmit meritorious energy, compensation network is idle and eliminates multiple function such as mains by harmonics.
To combine embodiment to be elaborated below with reference to accompanying drawing.
Description of drawings
Fig. 1 is the block diagram of multifunctional high-power electronic power convertor of the present invention;
Fig. 2 is the circuit structure diagram of high-power electric and electronic current transformer;
Fig. 3 is the circuit structure diagram of controller chip;
Fig. 4 is the control flow chart of system controller;
The reactive power compensation control flow chart that Fig. 5 matches with SVC for three-phase fully-controlled type rectification stage;
Fig. 6 is the control flow chart of three-phase fully-controlled type rectification stage;
The DC transfer circuit control flow chart of Fig. 7 for isolating;
Fig. 8 is three-phase or single-phase full-control type inverter control flow chart.
Embodiment
Multifunctional high-power electronic power convertor of the present invention comprises three-phase alternating-current supply, high-power electric and electronic current transformer and controller and SVC.
With reference to Fig. 1, the high-power electric and electronic current transformer comprises three-phase reactor 3, three-phase fully-controlled type rectification stage 8, DC transfer circuit 11, three-phase or single-phase full-control type inverse cascade 14 and three-phase or single-phase load or electrical network 16.
The input of three-phase reactor 3 is parallel on the electrical network in three-phase alternating-current supply 1 exit; The output of three-phase reactor 3 is connected to the input of three-phase fully-controlled type rectification stage 8; The output of three-phase fully-controlled type rectification stage 8 is connected to the input of three-phase or single-phase full-control type inverse cascade 14 through DC transfer circuit 11, and the output of three-phase or single-phase full-control type inverse cascade 14 is connected to three-phase or single-phase load or electrical network 16.
The input of SVC6 also connects on the electrical network in three-phase alternating-current supply 1 exit.
Controller is provided with coupled electric current, voltage sensor group and drive circuit.Electric current, voltage sensor group comprise the first current sensor group 4, the second current sensor group 7, voltage sensor 5, direct voltage transducer 12 and DC current sensor 19.
The input of the first current sensor group 4 is connected on the input electrical network of three-phase reactor 3; The input of the second current sensor group 7 is connected on the input electrical network of other loads 2 of electrical network; The input of voltage sensor 5 is parallel on the electrical network in three-phase alternating-current supply 1 exit; The output that the input of the input of direct voltage transducer 12 and DC current sensor 19 is connected to DC transfer circuit 11, the first current sensor groups 4, the second current sensor group 7, voltage sensor 5, direct voltage transducer 12 and DC current sensor 19 is connected with controller 13 respectively.
Drive circuit comprises first drive circuit 9, second drive circuit 10, the 3rd drive circuit 15 and the moving circuit 18 of 4 wheel driven.First drive circuit 9, second drive circuit 10, the 3rd drive circuit 15, moving circuit 18 each input of 4 wheel driven are connected with controller 13 respectively; The output of first drive circuit 9 is connected to three-phase fully-controlled type rectification stage 8; The output of second drive circuit 10 is connected to SVC6; The output that the output of the 3rd drive circuit 15 is connected to three-phase or the moving circuit 18 of single-phase full-control type inverse cascade 14, the 4 wheel drivens is connected to DC transfer circuit 11.
The load of three-phase or single-phase load or electrical network 16 outputs or the feedback signal 17 of electrical network are connected with controller 13.
The course of work of multifunctional high-power electronic power convertor of the present invention is described below.
Three-phase reactor 3 is used for the 8 output voltage filtering of current transformer rectification stage, regulates the phase relation of rectification stage 8 output voltage vector and line voltage vector.First group of current sensor 4 detects the input current of current transformer; Voltage sensor group 5 detects three phase network voltage; Second group of electric current that current sensor 7 detects in the three phase network; Direct voltage sensor groups 12 detects the voltage of current transformer rectification stage DC side; Detect the electric current of transformer secondary DC sides output for the DC transfer circuit of isolating 11 DC current sensors 19, with the detection signal of the first current sensor group 4, the second current sensor group 7, voltage sensor 5, direct voltage transducer 12 and DC current sensor 19 with detect load or the relevant feedback signal 17 of electrical network and send into controller 13.Can calculate the idle amount of the required compensation of electrical network by the detection signal of the second current sensor group 7 and voltage sensor 5; Judge whether three-phase fully-controlled type rectification stage 8 has residual capacity; If no residual capacity; Then only adopt SVC compensation network reactive power, current transformer only is operated in and transmits meritorious energy mode of operation; If current transformer rectification stage 8 residual capacities reach the work remaining of its compensating reactive power; Current transformer is operated in and both transmits meritorious energy, and the mode of operation of compensation network reactive power is again at first moved most idle amount in the SVC compensation network; Reserve the space of rectification stage 8 compensating reactive powers; After calculating rectification stage 8 required compensating reactive power amounts, idle given as rectification stage 8 realized the reactive power compensation to electrical network.Detection signal with 12, meritorious given as rectification stage 8 ensures that the dc voltage of rectification stage 8 is constant, realizes the meritorious NE BY ENERGY TRANSFER of rectification stage 8.Select the DC transfer circuit 11 of isolation or non-isolation for use according to the needs of load, realize dc-isolation and decoupling zero between load and the electrical network.The feedback signal 17 of load or electrical network sends signals such as unequally loaded control signal such as voltage, electric current, rotating speed to controller 13, unequally loaded is controlled realizing.First drive circuit 9, second drive circuit 10, the 3rd drive circuit 15 and the moving circuit 18 of 4 wheel driven receive the drive signal of controller 13 respectively, drive three-phase fully-controlled type rectification stage 8, SVC, three-phase or single-phase inverse cascade 14 and the DC transfer circuit 11 of isolating respectively.Three-phase or single-phase full-control type inverse cascade 14 can adopt different topological structures and control strategy to satisfy the unequally loaded needs.
In multifunctional high-power electronic power convertor of the present invention, controller can adopt the DSP-TMS320F2812 chip of American TI Company.Transform sampling unit and pwm pulse output unit (AD unit in the DSP-TMS320F2812 sheet and the output of the pwm pulse of DSP-TMS320F2812) comprising analog/digital.
With reference to Fig. 3; In first group of current sensor group 4, second group of current sensor group 7, voltage sensor group 5, direct voltage sensor groups 12 and DC current sensor 19; Current sensor adopts in the Nanjing TBC-SY/SYS dicyclo of company series closed loop Hall current sensor suddenly, and voltage sensor adopts in the Nanjing VSM025A type Hall voltage transducer of company suddenly.Drive circuit adopts the M57962 chip of Mitsubishi.
First group of current sensor group 4, second group of current sensor group 7, voltage sensor group 5, direct voltage sensor groups 12 and DC current sensor 19 detected signals send controller 13 to and carry out computing; The duty ratio of output PWM, and control pulse-width modulation PWM generation unit output pwm control signal to the first drive circuit 9, second drive circuit 10, the 3rd drive circuit 15 and the moving circuit 18 of 4 wheel driven.
In the different embodiment of multifunctional high-power electronic power convertor of the present invention, DC transfer circuit 11 can be the DC transfer circuit of isolation or non-isolation.
With reference to Fig. 4, the logic control step that controller 13 is carried out comprises:
The first step: initialization system;
Second step: the feedback signal 17 that starts first group of current sensor group 4, voltage sensor group 5, second group of current sensor group 7, direct voltage sensor groups 12, DC current sensor group 19 and load or electrical network;
The 3rd step: registration three-phase fully-controlled type rectification stage 8 and the control task of SVC6, DC transfer circuit 11 control tasks, registration three-phase or single-phase full-control type inverter 14 control tasks that registration is isolated;
The 4th step: combine with reference to Fig. 5, get into the reactive power compensation control that three-phase fully-controlled type rectification stage 8 matches with SVC6:
The 1st step: carry out instantaneous reactive through second group of current sensor group 7, voltage sensor group 5 and detect, obtain the idle amount in the network system;
The 2nd step: the input current that detects three-phase fully-controlled rectification stage 8 AC side through current sensor group 14; And judge whether the residual capacity of three-phase fully-controlled rectification stage 8 satisfies the working value of compensating reactive power; Be that three-phase fully-controlled rectification stage 8 is used for the residual capacity compensating reactive power and sets the least residue capacity
If not, only idle by the SVC6 compensation network, three-phase fully-controlled type rectification stage 8 only the back level is isolated or the DC transfer circuit 11 of non-isolation transmits meritorious energy, adopts the unity power factor operation, does not provide any idle to electrical network, carries out for the 5th step;
If carry out next step;
The 3rd step: the idle amount of the residual capacity of judging three-phase fully-controlled type rectification stage 8 in whether can the full remuneration network system, if then idle by three-phase fully-controlled type rectification stage 8 compensation networks fully, SVC6 does not work, and carries out for the 5th step;
If not; Then by the idle amount that cooperate compensation network of three-phase fully-controlled type rectification stage 8 with SVC6; Promptly most of idle by in the SVC6 compensation network system remains idle amount part and afforded redress by three-phase fully-controlled type rectification stage 8, and three-phase fully-controlled type rectification stage 8 is worked under non-unity power factor; Its satisfy that the back level is isolated or DC transfer circuit of non-isolation 11 meritorious energy requirements in, offer certain idle of electrical network;
The 4th step: the reactive power compensation control that output three-phase fully-controlled type rectification stage 8 matches with SVC6 is given, and controls given execution to three-phase fully-controlled type rectification stage 8, the DC transfer circuit 11 of isolation and the control of three-phase or single-phase full-control type inverse cascade 14 in the current transformer according to the reactive power compensation that above-mentioned three-phase fully-controlled type rectification stage 8 matches with SVC6:
The 5th step: whether system shuts down, if carry out next step; If, do not return for the 4th step;
The 6th step: finish.
With reference to Fig. 6, in above-mentioned logic control step that controller 13 is carried out in 4 steps, the control of three-phase fully-controlled type rectification stage 8 is comprised:
4-1 step: the magnitude of voltage that obtains current value in the three phase network that the magnitude of voltage of input current value in the three-phase reactor 3 that first group of current sensor group 4 collected, three phase network that voltage sensor group 5 is collected, second group of current sensor group 7 sampled, each Cascade H bridge DC side of the former limit of transformer that direct voltage sensor groups 12 is collected;
The 4-2 step: calculate the given of active current and reactive current;
The 4-3 step: vector control: the collection value of first group of current sensor group 4 and the collection value of voltage sensor group 5 are through decoupling zero; The meritorious amount and the idle amount of system are separated; The collection value of direct voltage sensor groups 12 is in order to feeding back the capacitance voltage of each Cascade H bridge DC side, with given dc capacitor voltage relatively after, the active current of control output rectification stage; Through stablizing the voltage of each Cascade H bridge DC side, realize the transmission of meritorious energy;
The 4-4 step: output control pulse to three-phase fully-controlled type rectification stage 8;
The 4-5 step: finish.
With reference to Fig. 7, in above-mentioned logic control step that controller 13 is carried out in 4 steps, the control of the DC transfer circuit 11 of isolating is comprised:
4-1 step: obtain the magnitude of voltage of the transformer secondary H bridge DC side output that direct voltage sensor groups 12 collected, obtain the current value of the transformer secondary H bridge DC side output that DC current sensor group 19 collected;
The 4-2 step: the error amount that calculates dc voltage; Calculate the power output of each bridge and the error of average power;
The 4-3 step: adopt voltage, the two closed-loop controls of power; Calculate the phase shifting angle of the DC transfer circuit 11 of isolating; To realize control to the DC transfer circuit 11 of isolating; The magnitude of voltage of the transformer secondary H bridge DC side output that feedback direct voltage sensor groups 12 is collected, stable with the DC transfer circuit 11 transformer secondary H bridge DC side capacitance voltages realizing isolating.Calculate the phase shifting angle of the DC transfer circuit 11 of isolating;
The 4-4 step: the product of the current value of the transformer secondary H bridge DC side output that magnitude of voltage that the transformer secondary H bridge DC side that adopts direct voltage sensor groups 12 to be collected is exported and DC current sensor group 19 are collected is as Feedback of Power; Output control pulse to the DC transfer circuit of isolating (11, realize the equilibrium control of power between each module;
The 4-5 step: finish.
With reference to Fig. 8, in above-mentioned logic control step that controller 13 is carried out in 4 steps, the control of three-phase or single-phase full-control type inverse cascade 14 is comprised:
The 4-1 step: the feedback signal 17 of obtaining load or electrical network;
The 4-2 step: vector control or direct torque control are used to exchange transmission, and vector control or direct Power Control are used for grid-connected current control;
The 4-3 step: output control pulse to three-phase fully-controlled type inverter 14;
The 4-4 step: finish.
The technique effect of multifunctional high-power electronic power convertor of the present invention is:
1, utilization SVC comes the required most of reactive power of compensation network; And current transformer is under the prerequisite that guarantees three-phase or single-phase load active power demand; Utilize current transformer rectification stage residual capacity to remove to produce the reactive power compensation electric current; Compensation SVC compensation back eliminates differential and the deficiency of improving the inhibition effect of voltage flicker, improves the quality of power supply of electrical network.Simultaneously, have and be electric and the idle function of compensation network, improved the utilance of current transformer.
If 2 adopt symmetrical structure, three-phase or single-phase load (can be three-phase or single-phase electrical network.Current transformer can compensate the reactive current of both sides electrical network simultaneously, or transmits meritorious energy.
3, aspect electric network reactive compensation, taken into account the advantage of the low-cost big capacity reactive power compensation of the rapid Continuous reactive power compensation of full-controlled rectifier level and SVC of current transformer, realized the making full use of of residual capacity of the full-control type rectification stage of current transformer.
4, be applicable to dissimilar loads, can adopt the DC transfer circuit of current transformer and isolate or the structure of non-isolation, to satisfy the unequally loaded needs.Because adopted the current transformer of back to back structure, the DC transfer circuit of rectification stage, isolation or non-isolation, inverse cascade can be realized the two-way flow of energy as required.
5, have characteristics such as reasonable in design, highly versatile, practicality, have good value for applications.
Embodiment recited above describes preferred implementation of the present invention; Be not that design of the present invention and scope are limited; Do not breaking away under the design prerequisite of the present invention, common engineers and technicians make technical scheme of the present invention in this area various modification and improvement all should fall into protection scope of the present invention; The technology contents that the present invention asks for protection all is documented in claims.
Claims (5)
1. multifunctional high-power electronic power convertor; Comprise three-phase alternating-current supply (1), high-power electric and electronic current transformer and controller thereof; Said controller (13) is provided with coupled electric current, voltage sensor group and drive circuit; It is characterized in that: also comprise SVC (6), the input parallel connection of said SVC (6) inserts on the electrical network in said three-phase alternating-current supply (1) exit;
Said high-power electric and electronic current transformer comprises three-phase reactor (3), three-phase fully-controlled type rectification stage (8), DC transfer circuit (11), three-phase or single-phase full-control type inverse cascade (14) and three-phase or single-phase load or electrical network (16); Wherein, The input of said three-phase reactor (3) is parallel on the electrical network in said three-phase alternating-current supply (1) exit; The output of said three-phase reactor (3) is connected to the input of said three-phase fully-controlled type rectification stage (8); The output of said three-phase fully-controlled type rectification stage (8) is connected to the input of said three-phase or single-phase full-control type inverse cascade (14) through said DC transfer circuit (11), and the output of said three-phase or single-phase full-control type inverse cascade (14) is connected to said three-phase or single-phase load or electrical network (16);
Said electric current, voltage sensor group comprise the first current sensor group (4), the second current sensor group (7), voltage sensor (5), direct voltage transducer (12) and DC current sensor (19); Wherein, The input of the said first current sensor group (4) is connected on the input electrical network of said three-phase reactor (3); The input of the said second current sensor group (7) is connected on the input electrical network of other loads of said electrical network (2); The input of said voltage sensor (5) is parallel on the electrical network in said three-phase alternating-current supply (1) exit; The input of the input of said direct voltage transducer (12) and DC current sensor (19) is connected to said DC transfer circuit (11), and the output of the said first current sensor group (4), the second current sensor group (7), voltage sensor (5), direct voltage transducer (12) and DC current sensor (19) is connected with said controller (13) respectively;
Said drive circuit comprises that first drive circuit (9), second drive circuit (10), the 3rd drive circuit (15) and 4 wheel driven move circuit (18); Wherein, Said first drive circuit (9), second drive circuit (10), the 3rd drive circuit (15), moving each input of circuit (18) of 4 wheel driven are connected with said controller (13) respectively; The output of said first drive circuit (9) is connected to said three-phase fully-controlled type rectification stage (8); The output of said second drive circuit (10) is connected to said SVC (6); The output of said the 3rd drive circuit (15) is connected to said three-phase or single-phase full-control type inverse cascade (14), and the output of the moving circuit (18) of said 4 wheel driven is connected to said DC transfer circuit (11);
The load of said three-phase or single-phase load or electrical network (16) output or the feedback signal (17) of electrical network are connected with said controller (13);
The logic control step that said controller (13) is carried out comprises:
The first step: initialization system;
Second step: the feedback signal (17) that starts the first current sensor group (4), voltage sensor group (5), the second current sensor group (7), direct voltage sensor groups (12), DC current sensor group (19) and load or electrical network;
The 3rd step: registration three-phase fully-controlled type rectification stage (8) and the control task of SVC (6), DC transfer circuit (11) control task, registration three-phase or single-phase full-control type inverter (14) control task that registration is isolated;
The 4th step: get into the reactive power compensation control that three-phase fully-controlled type rectification stage (8) matches with SVC (6):
The 1st step: carry out instantaneous reactive through the second current sensor group (7), voltage sensor group (5) and detect, obtain the idle amount in the network system;
The 2nd step: the input current that detects three-phase fully-controlled rectification stage (8) AC side through the first current sensor group (4); And whether the residual capacity of judging three-phase fully-controlled rectification stage (8) satisfy the working value of compensating reactive power, and promptly three-phase fully-controlled rectification stage (8) is used for the residual capacity compensating reactive power and sets the least residue capacity;
If not, only idle by SVC (6) compensation network, three-phase fully-controlled type rectification stage (8) only the back level is isolated or the DC transfer circuit (11) of non-isolation transmits meritorious energy, adopts the unity power factor operation, does not provide any idle to electrical network, carries out for the 5th step;
If carry out next step;
The 3rd step: the idle amount of the residual capacity of judging three-phase fully-controlled type rectification stage (8) in whether can the full remuneration network system, if then idle by three-phase fully-controlled type rectification stage (8) compensation network fully, SVC (6) does not work, and carries out for the 5th step;
If not; Then by the idle amount that cooperate compensation network of three-phase fully-controlled type rectification stage (8) with SVC (6); Promptly most of idle by in SVC (6) the compensation network system remains idle amount part and afforded redress by three-phase fully-controlled type rectification stage (8), and three-phase fully-controlled type rectification stage (8) is worked under non-unity power factor; Its satisfy that the back level is isolated or the meritorious energy requirement of DC transfer circuit (11) of non-isolation in, offer certain idle of electrical network;
The 4th step: the reactive power compensation control that output three-phase fully-controlled type rectification stage (8) matches with SVC (6) is given, and controls given execution to three-phase fully-controlled type rectification stage (8), the DC transfer circuit (11) of isolating and the control of three-phase or single-phase full-control type inverse cascade (14) in the current transformer according to the reactive power compensation that above-mentioned three-phase fully-controlled type rectification stage (8) matches with SVC (6);
The 5th step: whether system shuts down, if carry out next step; If, do not return for the 4th step;
The 6th step: finish.
2. multifunctional high-power electronic power convertor according to claim 1 is characterized in that: in wherein said the 4th step, the control of three-phase fully-controlled type rectification stage (8) being comprised:
4-1 step: obtain the magnitude of voltage, the current value in the three phase network that the second current sensor group (7) is sampled of input current value in the three-phase reactor (3) that the first current sensor group (4) collected, three phase network that voltage sensor group (5) is collected, the magnitude of voltage of each Cascade H bridge DC side of the former limit of transformer that direct voltage sensor groups (12) is collected;
The 4-2 step: calculate the given of active current and reactive current;
The 4-3 step: vector control, the meritorious amount of piece-rate system and idle amount;
The 4-4 step: output control pulse to three-phase fully-controlled type rectification stage (8);
The 4-5 step: finish.
3. multifunctional high-power electronic power convertor according to claim 1 and 2 is characterized in that: in wherein said the 4th step, the control of the DC transfer circuit (11) of isolating is comprised:
4-1 step: obtain the magnitude of voltage of the transformer secondary H bridge DC side output that direct voltage sensor groups (12) collected, obtain the current value of the transformer secondary H bridge DC side output that DC current sensor group (19) collected;
The 4-2 step: the error amount that calculates dc voltage; Calculate the error amount of the power output and the average power of each bridge;
The 4-3 step: adopt voltage, the two closed-loop controls of power, calculate the phase shifting angle of the DC transfer circuit (11) of isolating;
The 4-4 step: output control pulse to the DC transfer circuit (11) of isolating:
The 4-5 step: finish.
4. multifunctional high-power electronic power convertor according to claim 3 is characterized in that: in wherein said the 4th step, the control of three-phase or single-phase full-control type inverse cascade (14) being comprised:
The 4-1 step: the feedback signal (17) of obtaining load or electrical network;
The 4-2 step: vector control or direct torque control are used to exchange transmission, and vector control or direct Power Control are used for grid-connected current control;
The 4-3 step: output control pulse to three-phase fully-controlled type inverter (14);
The 4-4 step: finish.
5. multifunctional high-power electronic power convertor according to claim 4 is characterized in that: wherein said DC transfer circuit (11) is the DC transfer circuit of isolation or non-isolation.
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| CN103036451A (en) * | 2013-01-16 | 2013-04-10 | 广东电网公司电力科学研究院 | Electronic power transformer |
| CN104135012A (en) * | 2014-08-20 | 2014-11-05 | 国家电网公司 | Intelligent electric meter having function of compensating for user alternating voltage amplitude |
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| CN112332683A (en) * | 2020-11-10 | 2021-02-05 | 青岛鼎信通讯股份有限公司 | Power electronic transformer based on square wave converter |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103036451A (en) * | 2013-01-16 | 2013-04-10 | 广东电网公司电力科学研究院 | Electronic power transformer |
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| CN110829865B (en) * | 2019-11-07 | 2021-04-13 | 国网江苏省电力有限公司电力科学研究院 | Self-adaptive switching method, device and system suitable for power electronic transformer |
| CN112332683A (en) * | 2020-11-10 | 2021-02-05 | 青岛鼎信通讯股份有限公司 | Power electronic transformer based on square wave converter |
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