CN102427299B - 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 compensation structure, have transmit meritorious energy, compensation network is idle, eliminate the multi-functional electronic power convertors such as mains by harmonics.
Background technology
Along with the development of electric power system, various impact loads make on electrical network voltage fluctuation frequent as industrial arc, electric locomotive, rolling mill etc., and a large amount of semiconductor rectifier equipment causes harmonic wave in electrical network, makes quality of power supply variation.A large amount of appearance of new sensitive equipment (as semiconductor manufacturing factory etc.), have 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 been 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, the devices such as all kinds of Static Var Compensator (SVC), static reacance generator (SVG), high-power electric and electronic transformer (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, high-power converter function ratio is more single, the residual capacity of current transformer is a lot of under many circumstances, as cut after electric motor starting in high-power converter in alternating current machine dragging system, in idle state, its specified power capacity can not be fully utilized, and 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 if 3, most high-power converter and powerful electric power electric transformer possess the function of reactive power compensation, owing to self first will ensureing the transmission of meritorious energy, the idle also limited compensating, practical value is not high.
4, TCR type SVC controls by controlling the conducting of thyristor the electric current that flows through reactor constantly, thereby follow the tracks of fast the idle power of load, and asymmetric by phase-splitting control and compensation three-phase, the AC filter installation mating with it absorbs harmonic wave, be a kind of technology maturation, cost performance high, have compared with the product of large compensation capacity.But the response time is slower, low to the improvement rate of flickering, cause even sometimes flickering aggravation.TSC type SVC has adopted capacitor group switching mode, can realize idle large capacity classification and regulate, and its advantage is that compensating circuit is simple in structure, and cost is low.But this mode still exists compensation speed slow, the switching due to capacitor is that classification is carried out again, and the reactive power compensation amount of generation is also phase step type, can make electrical network occur overcompensation or undercompensation state.
5, SVG adopts full-control type device, and fast response time suppresses flickering effective, but does not have the function of transmitting meritorious energy.
Summary of the invention
The object of the invention is to overcome above-mentioned defect, 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 to flickering, has and transmits 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, described controller is provided with coupled electric current, voltage sensor group and drive circuit, on the electrical network in the input access in parallel described three-phase alternating-current supply exit of described SVC;
Described 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 described three-phase reactor is parallel on the electrical network in described three-phase alternating-current supply exit, the output of described three-phase reactor is connected to the input of described three-phase fully-controlled type rectification stage, the output of described three-phase fully-controlled type rectification stage is connected to the input of described three-phase or single-phase full-control type inverse cascade by described DC transfer circuit, the output of described three-phase or single-phase full-control type inverse cascade is connected to described three-phase or single-phase load or electrical network,
Described electric current, voltage sensor group comprises the first current sensor group, the second current sensor group, voltage sensor, direct current voltage sensor and DC current sensor, wherein, the input of described the first current sensor group is connected on the input electrical network of described three-phase reactor, the input of described the second current sensor group is connected on the input electrical network of other loads of electrical network, the input of described voltage sensor is parallel on the electrical network in described three-phase alternating-current supply exit, the input of described direct current voltage sensor and the input of DC current sensor are connected to described DC transfer circuit, described the first current sensor group, the second current sensor group, voltage sensor, the output of direct current voltage sensor and DC current sensor is connected with described controller respectively,
Described drive circuit comprises the first drive circuit, the second drive circuit, the 3rd drive circuit and the 4th drive circuit, wherein, described the first drive circuit, the second drive circuit, the 3rd drive circuit, the 4th each input of drive circuit is connected with described controller respectively, the output of described the first drive circuit is connected to described three-phase fully-controlled type rectification stage, the output of described the second drive circuit is connected to described SVC, the output of described the 3rd drive circuit is connected to described three-phase or single-phase full-control type inverse cascade, the output of described the 4th drive circuit is connected to described DC transfer circuit,
The load feedback signal of described three-phase or single-phase load or electrical network output is connected with described controller;
The logic control step that described 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 current voltage sensor group, DC current sensor group and load feedback signal;
The 3rd step: registration full-bridge phase shifting task, registration inverse cascade control task, registration rectification stage control task;
The 4th step: enter the control of reactive power compensating that three-phase fully-controlled type rectification stage matches with SVC:
The 1st step: carry out instantaneous reactive detection by the second current sensor group, voltage sensor group, obtain the idle amount in network system;
The 2nd step: the input current that detects three-phase fully-controlled rectification stage AC by the first current sensor group, and judge whether the residual capacity of three-phase fully-controlled rectification stage meets the working value of compensating reactive power, be that three-phase fully-controlled rectification stage sets least residue capacity for residual capacity compensating reactive power
If not, only idle by SVC compensation network, three-phase fully-controlled type rectification stage only, to the meritorious energy of the DC transfer circuit transmission of rear class isolation or non-isolation, adopts unity power factor operation, to electrical network, does not provide any idle, carries out the 5th step;
If so, carry out next step;
The 3rd step: the idle amount of the residual capacity that judges three-phase fully-controlled type rectification stage in whether can full remuneration network system, if so, completely idle by three-phase fully-controlled type rectification stage compensation network, SVC does not work, and carries out the 5th step;
If not, the idle amount that coordinates compensation network with SVC by three-phase fully-controlled type rectification stage, the major part in SVC compensation network system is idle, remaining idle amount part is afforded redress by three-phase fully-controlled type rectification stage, three-phase fully-controlled type rectification stage is worked under non-unity power factor, it offers certain idle of electrical network in the meritorious energy requirement of the DC transfer circuit that meets rear class isolation or non-isolation;
The 4th step: the control of reactive power compensating that output three-phase fully-controlled type rectification stage matches with SVC is given, and the control of the given execution of the control of reactive power compensating matching with SVC according to above-mentioned three-phase fully-controlled type rectification stage to the DC transfer circuit of three-phase fully-controlled type rectification stage, isolation in current transformer and three-phase or single-phase full-control type inverse cascade:
The 5th step: whether system shuts down, if so, carries out next step; If not, return to the 4th step;
The 6th step: finish.
Multifunctional high-power electronic power convertor of the present invention, 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 three phase network that the second current sensor group samples of input current value in the three-phase reactor that the first current sensor group collects, three phase network that voltage sensor group collects, the magnitude of voltage of each Cascade H bridge DC side of transformer primary side that direct current voltage sensor group collects;
4-2 step: calculate the given of active current and reactive current;
4-3 step: vector control, the meritorious amount of piece-rate system and idle amount;
4-4 step: output control pulse is to three-phase fully-controlled type rectification stage;
4-5 step: finish.
Multifunctional high-power electronic power convertor of the present invention, wherein said the 4th step, comprises the control of the DC transfer circuit of isolation:
4-1 step: obtain the magnitude of voltage of the transformer secondary H bridge DC side output that direct current voltage sensor group collects, obtain the current value of the transformer secondary H bridge DC side output that DC current sensor group collects;
4-2 step: the error amount that calculates DC voltage; Calculate the power output of each bridge and the error of average power;
4-3 step: adopt voltage, the two closed-loop controls of power, calculate the phase shifting angle of the DC transfer circuit of isolation;
4-4 step: output control pulse is the DC transfer circuit of isolation extremely:
4-5 step: finish.
Multifunctional high-power electronic power convertor of the present invention, wherein said the 4th step, comprises the control of three-phase or single-phase full-control type inverse cascade:
4-1 step: the feedback signal of obtaining load;
4-2 step: vector control or direct torque control are for AC Drive, and vector control or direct Power Control are controlled for grid-connected current;
4-3 step: output control pulse is to three-phase fully-controlled type inverter;
4-4 step: finish.
Advantage and the good effect of multifunctional high-power electronic power convertor of the present invention are: owing to being 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, 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 to low capacity reactive power combine, adopt mixed type reactive compensation structure, therefore have transmit meritorious energy, compensation network is idle and eliminate the several functions such as mains by harmonics.
Below in conjunction with embodiment, with reference to accompanying drawing, be elaborated.
Accompanying drawing explanation
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;
Fig. 5 is the control of reactive power compensating flow chart that three-phase fully-controlled type rectification stage matches with SVC;
Fig. 6 is the control flow chart of three-phase fully-controlled type rectification stage;
Fig. 7 is the DC transfer circuit control flow chart of isolation;
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, 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 by DC transfer circuit 11, 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 current voltage sensor 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 input of the input of direct current voltage sensor 12 and DC current sensor 19 is connected to DC transfer circuit 11, the first current sensor group 4, the second current sensor group 7, voltage sensor 5, the output of direct current voltage sensor 12 and DC current sensor 19 is connected with controller 13 respectively.
Drive circuit comprises the first drive circuit 9, the second drive circuit 10, the 3rd drive circuit 15 and the 4th drive circuit 18.The first drive circuit 9, the second drive circuit 10, the 3rd drive circuit 15, the 4th drive circuit 18 each inputs are connected with controller 13 respectively, the output of the first drive circuit 9 is connected to three-phase fully-controlled type rectification stage 8, the output of the 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 single-phase full-control type inverse cascade 14, the four drive circuits 18 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 following describes the course of work of multifunctional high-power electronic power convertor of the present invention.
Three-phase reactor 3, 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 three phase network, direct current voltage sensor group 12 detects the voltage of current transformer rectification stage DC side, for DC transfer circuit 11 DC current sensor 19 of isolation, detect the electric current of transformer secondary DC side output, by the first current sensor group 4, the second current sensor group 7, voltage sensor 5, the detection signal of direct current voltage sensor 12 and DC current sensor 19 is sent into controller 13 with detection load or the relevant feedback signal 17 of electrical network.Can be calculated by the detection signal of the second current sensor group 7 and voltage sensor 5 the idle amount of the required compensation of electrical network, judge whether three-phase fully-controlled type rectification stage 8 has residual capacity, if without residual capacity, only adopt SVC compensation network reactive power, current transformer is only 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, the mode of operation of compensation network reactive power again, first move most idle amount in SVC compensation network, reserve the space of rectification stage 8 compensating reactive powers, calculate after the required compensating reactive power amount of rectification stage 8, idle given as rectification stage 8, realizes the reactive power compensation to electrical network.By 12 detection signal, meritorious given as rectification stage 8, ensures that the DC voltage of rectification stage 8 is constant, realizes the meritorious energy transmission of rectification stage 8.The DC transfer circuit 11 of selecting isolation or non-isolation according to the needs of load, realizes DC-isolation and decoupling zero between load and electrical network.The feedback signal 17 of load or electrical network, sends unequally loaded control signal to controller 13 as signals such as voltage, electric current, rotating speeds, to realize, unequally loaded is controlled.The first drive circuit 9, the second drive circuit 10, the 3rd drive circuit 15 and the 4th drive circuit 18 receive respectively the driving signal of controller 13, drive respectively 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.Three-phase or single-phase full-control type inverse cascade 14 can adopt different topological structures and control strategy to meet unequally loaded needs.
In multifunctional high-power electronic power convertor of the present invention, controller can adopt DSP-TMS320F2812 chip of American TI Company.Comprising analog/digital, transform sampling unit and pwm pulse output unit (the AD unit in DSP-TMS320F2812 sheet and the output of the pwm pulse of DSP-TMS320F2812).
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 current voltage sensor group 12 and DC current sensor 19, current sensor adopts the TBC-SY/SYS dicyclo series closed loop Hall current sensor of Nanjing Zhong Huo company, and voltage sensor adopts the VSM025A type Hall voltage transducer of Nanjing Zhong Huo company.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 current voltage sensor group 12 and the detected signal of DC current sensor 19 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, the second drive circuit 10, the 3rd drive circuit 15 and the 4th drive circuit 18.
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 current voltage sensor group 12, DC current sensor group 19 and load or electrical network;
The 3rd step: registration full-bridge phase shifting task, registration inverse cascade control task, registration rectification stage control task;
The 4th step: combination, with reference to Fig. 5, enters the control of reactive power compensating that three-phase fully-controlled type rectification stage 8 matches with SVC6:
The 1st step: carry out instantaneous reactive detection by second group of current sensor group 7, voltage sensor group 5, obtain the idle amount in network system;
The 2nd step: the input current that detects three-phase fully-controlled rectification stage 8 ACs by current sensor group 14, and judge whether the residual capacity of three-phase fully-controlled rectification stage 8 meets the working value of compensating reactive power, be that three-phase fully-controlled rectification stage 8 sets least residue capacity for residual capacity compensating reactive power
If not, only idle by SVC6 compensation network, three-phase fully-controlled type rectification stage 8 only transmits meritorious energy to the DC transfer circuit 11 of rear class isolation or non-isolation, adopts unity power factor operation, to electrical network, does not provide any idle, carries out the 5th step;
If so, carry out next step;
The 3rd step: the idle amount of the residual capacity that judges three-phase fully-controlled type rectification stage 8 in whether can full remuneration network system, if so, completely idle by three-phase fully-controlled type rectification stage 8 compensation networks, SVC6 does not work, and carries out the 5th step;
If not, the idle amount that coordinates compensation network with SVC6 by three-phase fully-controlled type rectification stage 8, the major part in SVC6 compensation network system is idle, remaining idle amount part is afforded redress by three-phase fully-controlled type rectification stage 8, three-phase fully-controlled type rectification stage 8 is worked under non-unity power factor, it offers certain idle of electrical network when meeting the meritorious energy requirement of DC transfer circuit 11 of rear class isolation or non-isolation;
The 4th step: the control of reactive power compensating that output three-phase fully-controlled type rectification stage 8 matches with SVC6 is given, and the given execution of the control of reactive power compensating matching with SVC6 according to above-mentioned three-phase fully-controlled type rectification stage 8 is 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 current transformer:
The 5th step: whether system shuts down, if so, carries out next step; If not, return to the 4th step;
The 6th step: finish.
With reference to Fig. 6, in above-mentioned logic control step the 4 steps of carrying out at controller 13, 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 collect, three phase network that voltage sensor group 5 collects, second group of current sensor group 7 sample, each Cascade H bridge DC side of transformer primary side that direct current voltage sensor group 12 collects;
4-2 step: calculate the given of active current and reactive current;
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 of system and idle amount are separated, the collection value of direct current voltage sensor group 12 is in order to feed back the capacitance voltage of each Cascade H bridge DC side, with given DC capacitor voltage relatively after, control the active current of output rectification stage, by stablizing the voltage of each Cascade H bridge DC side, realize the transmission of meritorious energy;
4-4 step: output control pulse is to three-phase fully-controlled type rectification stage 8;
4-5 step: finish.
With reference to Fig. 7, in above-mentioned logic control step the 4 steps of carrying out at controller 13, the control of the DC transfer circuit 11 of isolation is comprised:
4-1 step: obtain the magnitude of voltage of the transformer secondary H bridge DC side output that direct current voltage sensor group 12 collects, obtain the current value of the transformer secondary H bridge DC side output that DC current sensor group 19 collects;
4-2 step: the error amount that calculates DC voltage; Calculate the power output of each bridge and the error of average power;
4-3 step: adopt voltage, the two closed-loop controls of power, calculate the phase shifting angle of the DC transfer circuit 11 of isolation, to realize the control to the DC transfer circuit 11 of isolation, the magnitude of voltage of the transformer secondary H bridge DC side output that feedback direct current voltage sensor group 12 collects, to realize DC transfer circuit 11 transformer secondary H bridge DC side capacitance voltages stable of isolation.Calculate the phase shifting angle of the DC transfer circuit 11 of isolation;
4-4 step: the product of the current value of the magnitude of voltage of the transformer secondary H bridge DC side output that employing direct current voltage sensor group 12 collects and the transformer secondary H bridge DC side output that DC current sensor group 19 collects is as Feedback of Power, the DC transfer circuit that output control pulse is extremely isolated (11, realize the equilibrium of power between each module and control;
4-5 step: finish.
With reference to Fig. 8, in above-mentioned logic control step the 4 steps of carrying out at controller 13, the control of three-phase or single-phase full-control type inverse cascade 14 is comprised:
4-1 step: the feedback signal 17 of obtaining load or electrical network;
4-2 step: vector control or direct torque control are for AC Drive, and vector control or direct Power Control are controlled for grid-connected current;
4-3 step: output control pulse is to three-phase fully-controlled type inverter 14;
4-4 step: finish.
The technique effect of multifunctional high-power electronic power convertor of the present invention is:
1, use SVC to carry out the required most of reactive power of compensation network, and current transformer is guaranteeing under the prerequisite of three-phase or single-phase load active power demand, utilize current transformer rectification stage residual capacity to remove to produce reactive power compensation electric current, after compensation SVC compensation, eliminate the differential deficiency with improving the inhibition of voltage flicker, improve the quality of power supply of electrical network., have for load supplying and the idle function of compensation network meanwhile, 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 large capacity reactive compensation of the quick Continuous Var Compensation of full-controlled rectifier level of current transformer and SVC, realized the making full use of of residual capacity of the full-control type rectification stage of current transformer.
4, be applicable to dissimilar load, to the DC transfer circuit of current transformer, can adopt the structure of isolation or non-isolation, to meet unequally loaded needs.Owing to having 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, there is the features such as reasonable in design, highly versatile, practicality, have good value for applications.
Embodiment recited above is described the preferred embodiment of the present invention; not the spirit and scope of the present invention are limited; do not departing under design prerequisite of the present invention; various modification and improvement that in this area, common engineers and technicians make technical scheme of the present invention; all should fall into protection scope of the present invention; the technology contents that the present invention asks for protection, is all documented in claims.
Claims (4)
1. a multifunctional high-power electronic power convertor, comprise three-phase alternating-current supply (1), high-power electric and electronic current transformer main circuit and controller thereof, described controller (13) is provided with coupled electric current, voltage sensor group and drive circuit, it is characterized in that: also comprise SVC (6), on the electrical network in input access in parallel described three-phase alternating-current supply (1) exit of described SVC (6);
Described high-power electric and electronic current transformer main circuit 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 described three-phase reactor (3) is parallel on the electrical network in described three-phase alternating-current supply (1) exit, the output of described three-phase reactor (3) is connected to the input of described three-phase fully-controlled type rectification stage (8), the output of described three-phase fully-controlled type rectification stage (8) is connected to the input of described three-phase or single-phase full-control type inverse cascade (14) by described DC transfer circuit (11), the output of described three-phase or single-phase full-control type inverse cascade (14) is connected to described three-phase or single-phase load or electrical network (16),
Described electric current, voltage sensor group comprises the first current sensor group (4), the second current sensor group (7), voltage sensor (5), direct current voltage sensor (12) and DC current sensor (19), wherein, the input of described the first current sensor group (4) is connected on the input electrical network of described three-phase reactor (3), the input of described the second current sensor group (7) is connected on the input electrical network of other loads of electrical network (2), the input of described voltage sensor (5) is parallel on the electrical network in described three-phase alternating-current supply (1) exit, the input of the input of described direct current voltage sensor (12) and DC current sensor (19) is connected to described DC transfer circuit (11), described the first current sensor group (4), the second current sensor group (7), voltage sensor (5), the output of direct current voltage sensor (12) and DC current sensor (19) is connected with described controller (13) respectively,
Described drive circuit comprises the first drive circuit (9), the second drive circuit (10), the 3rd drive circuit (15) and the 4th drive circuit (18), wherein, described the first drive circuit (9), the second drive circuit (10), the 3rd drive circuit (15), the 4th each input of drive circuit (18) is connected with described controller (13) respectively, the output of described the first drive circuit (9) is connected to described three-phase fully-controlled type rectification stage (8), the output of described the second drive circuit (10) is connected to described SVC (6), the output of described the 3rd drive circuit (15) is connected to described three-phase or single-phase full-control type inverse cascade (14), the output of described the 4th drive circuit (18) is connected to described DC transfer circuit (11),
The load of described three-phase or single-phase load or electrical network (16) output or the feedback signal (17) of electrical network are connected with described controller (13);
The logic control step that described 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 current voltage sensor group (12), DC current sensor group (19) and load or electrical network;
The 3rd step: registration full-bridge phase shifting task, registration inverse cascade control task, registration rectification stage control task;
The 4th step: enter the control of reactive power compensating that three-phase fully-controlled type rectification stage (8) matches with SVC (6):
The 1st step: carry out instantaneous reactive detection by the second current sensor group (7), voltage sensor group (5), obtain the idle amount in network system;
The 2nd step: the input current that detects three-phase fully-controlled rectification stage (8) AC by the first current sensor group (4), and whether the residual capacity that judges three-phase fully-controlled rectification stage (8) meet the working value of compensating reactive power, three-phase fully-controlled rectification stage (8) sets least residue capacity for residual capacity compensating reactive power;
If not, only idle by SVC (6) compensation network, three-phase fully-controlled type rectification stage (8) only transmits meritorious energy to the DC transfer circuit (11) of rear class isolation or non-isolation, adopts unity power factor operation, to electrical network, do not provide any idle, carry out the 5th step;
If so, carry out next step;
The 3rd step: the idle amount of the residual capacity that judges three-phase fully-controlled type rectification stage (8) in whether can full remuneration network system, if, completely idle by three-phase fully-controlled type rectification stage (8) compensation network, SVC (6) does not work, and carries out the 5th step;
If not, the idle amount that coordinates compensation network with SVC (6) by three-phase fully-controlled type rectification stage (8), the major part in SVC (6) compensation network system is idle, remaining idle amount part is afforded redress by three-phase fully-controlled type rectification stage (8), three-phase fully-controlled type rectification stage (8) is worked under non-unity power factor, it offers certain idle of electrical network in the meritorious energy requirement of the DC transfer circuit (11) that meets rear class isolation or non-isolation;
The 4th step: output three-phase fully-controlled type rectification stage (8) is given with the control of reactive power compensating that SVC (6) matches, and the given execution of the control of reactive power compensating matching with SVC (6) according to above-mentioned three-phase fully-controlled type rectification stage (8) is 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 current transformer;
The 5th step: whether system shuts down, if so, carries out next step; If not, return to the 4th step;
The 6th step: finish.
2. multifunctional high-power electronic power convertor according to claim 1, is characterized in that: wherein said the 4th step, comprising the control of three-phase fully-controlled type rectification stage (8):
4-1 step: obtain the magnitude of voltage, the current value in three phase network that the second current sensor group (7) samples of input current value in the three-phase reactor (3) that the first current sensor group (4) collects, three phase network that voltage sensor group (5) collects, the magnitude of voltage of each Cascade H bridge DC side of transformer primary side that direct current voltage sensor group (12) collects;
4-2 step: calculate the given of active current and reactive current;
4-3 step: vector control, the meritorious amount of piece-rate system and idle amount;
4-4 step: output control pulse is to three-phase fully-controlled type rectification stage (8);
4-5 step: finish.
3. multifunctional high-power electronic power convertor according to claim 1 and 2, is characterized in that: wherein said the 4th step, comprises the control of the DC transfer circuit (11) of isolation:
4-1 step: obtain the magnitude of voltage of the transformer secondary H bridge DC side output that direct current voltage sensor group (12) collects, obtain the current value of the transformer secondary H bridge DC side output that DC current sensor group (19) collects;
4-2 step: the error amount that calculates DC voltage; Calculate the error amount of power output and the average power of each bridge;
4-3 step: adopt voltage, the two closed-loop controls of power, calculate the phase shifting angle of the DC transfer circuit (11) of isolation;
4-4 step: output control pulse is the DC transfer circuit (11) of isolation extremely:
4-5 step: finish.
4. multifunctional high-power electronic power convertor according to claim 3, is characterized in that: wherein said the 4th step, comprising the control of three-phase or single-phase full-control type inverse cascade (14):
4-1 step: the feedback signal (17) of obtaining load or electrical network;
4-2 step: vector control or direct torque control are for AC Drive, and vector control or direct Power Control are controlled for grid-connected current;
4-3 step: output control pulse is to three-phase fully-controlled type inverter (14);
4-4 step: finish.
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| CN103036451B (en) * | 2013-01-16 | 2015-04-22 | 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 |
| CN105137376B (en) * | 2015-06-30 | 2018-02-02 | 株洲南车时代电气股份有限公司 | A kind of medium voltage sensor fault diagnosis method of Locomotive Converter |
| 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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