CN110957749B - Multi-level bidirectional converter with electric energy quality control function and control method thereof - Google Patents

Multi-level bidirectional converter with electric energy quality control function and control method thereof Download PDF

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CN110957749B
CN110957749B CN201911153067.8A CN201911153067A CN110957749B CN 110957749 B CN110957749 B CN 110957749B CN 201911153067 A CN201911153067 A CN 201911153067A CN 110957749 B CN110957749 B CN 110957749B
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converter
power
load
active
current
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CN110957749A (en
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蔡蔚
陈海军
张超
雷艺
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Guangxi Vocational and Technical College of Communications
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/28—Arrangements for balancing of the load in a network by storage of energy
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/01—Arrangements for reducing harmonics or ripples
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/30—Reactive power compensation
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/40—Arrangements for reducing harmonics

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Abstract

The invention has disclosed a kind of multiple two-way converter with function of managing quality of electric energy and its control method, its control system is divided into two parts, one of them is active control and reactive controller, judge whether the module has load at first, judge whether there is feedback of functional quantity to the module with load again, when needing the feedback of the power, distribute the power that needs the feedback of the power to each module with load; judging whether the power grid needs reactive power treatment or not for the no-load modules, and if so, averagely distributing the reactive power to be treated to each no-load module; the other part is a CPS-SPWM controller which adopts the same carrier phase shift modulation method for the same type of converter modules according to different working modes of the converter modules. The invention can achieve the purposes of flexibly adjusting the active power of the power grid, improving the utilization rate of the converter, reducing the burden of the filter and improving the output characteristic of the multiple bidirectional converter.

Description

Multi-level bidirectional converter with electric energy quality control function and control method thereof
Technical Field
The invention relates to a bidirectional converter, in particular to a multiple bidirectional converter with an electric energy quality control function and a control method thereof.
Background
With the popularization of pure electric vehicles and plug-in hybrid electric vehicles, a large amount of charging equipment is arranged in each corner of a city or a countryside, and a large-scale charging station is constructed in a large amount and is applied to charging of automobile power batteries.
Currently, the charging station mostly uses an ac-dc (i.e. rectification) method to charge the power battery. The rectification link adopts a PWM rectifier mostly, the power of the PWM rectifier flows in a unidirectional mode, and then the output is accurately adjusted in the direct current conversion charging link mainly according to the voltage, current or power requirements of the load.
Because there may be a plurality of devices to be charged in the charging station, when the PWM rectifier is connected in parallel to the ac bus, the same common access point is commonly accessed. At this point, each active PWM rectifier generates its own harmonics, while the inactive PWM rectifier may be cut out of electrical contact with the ac bus. In fact, the PWM rectifier is not well utilized, it neither realizes the bidirectional flow of energy, nor makes good use of the interaction between multiple PWM rectifiers to reduce the impact of the PWM rectifier's own output harmonics on the grid, nor makes good use of idle PWM rectification.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a multiple bidirectional converter with an electric energy quality control function and a control method thereof, so as to achieve the purposes of flexibly adjusting the active power of a power grid, improving the utilization rate of the converter, reducing the load of a filter and improving the output characteristic of the multiple bidirectional converter.
In order to solve the technical problems, the invention adopts the following technical scheme:
a multiple bidirectional converter with an electric energy quality control function comprises a power grid alternating current voltage transformer, an active power controller, a reactive power controller, a CPS-SPWM controller, a plurality of converter modules, an alternating current output bus and a centralized filter; the power grid alternating voltage transformer, the active and reactive controllers and the CPS-SPWM controller are sequentially connected in series, and the power grid alternating voltage transformer is also connected into a power grid; the converter modules are connected in parallel and connected to an alternating current output bus, and the alternating current output bus is connected into a centralized filter; each converter module comprises a converter, an output reactor, a sub-output current transformer and an alternating current side switch which are connected in series, wherein the converter is also coupled with the CPS-SPWM controller, and the sub-output current transformer is also coupled with the active controller and the reactive controller; the CPS-SPWM controller is used for adopting two independent carrier phase shift modulations according to the load access state of the converter module, and determining the angle size of the modulated carrier phase shift according to the load or no-load quantity.
Preferably, the multiplexed bidirectional converter with the energy quality management function further comprises a total output current transformer, which is connected to the power grid, is also coupled to the active and reactive controllers, and is also coupled to the plurality of converter modules through ac output buses, respectively.
Preferably, an independent dc capacitor is coupled to each current transformer.
The control system of the multiple bidirectional converter with the function of managing the energy quality is divided into two parts, wherein one part is an active control controller and a reactive controller; judging whether the power grid needs reactive power treatment or not for the no-load modules, and if so, averagely distributing the reactive power to be treated to each no-load module; the other part is a CPS-SPWM controller which adopts the same carrier phase shift modulation method for the same type of converter modules according to different working modes of the converter modules, and certain phase shift exists between carriers of the converter modules with different working modes. The PWM bidirectional converter does not need to be additionally provided with a reactive compensation and harmonic treatment device, can also improve the power supply quality function, treat the reactive and harmonic problems generated by other equipment, save the installation space of power supply system equipment and reduce the total investment of power supply equipment.
More specifically, the control method of the multiple bidirectional converter with the power quality management function mainly comprises the following steps:
1) the active controller and the reactive controller respectively detect the load access states of the converter modules and calculate the load quantity and the no-load quantity;
2) the active and reactive controllers judge whether the AC power grid side needs active feedback and whether reactive treatment is needed;
3) when the AC power grid side needs active feedback, the converter module connected with the load feeds back the active power of the AC power grid, the total amount of the active power needing to be fed back is distributed to each converter module in the active power and reactive power controllers, the feedback current direction of each converter module is changed, power current double closed-loop control is adopted, the active power reference value of each module is compared with the feedback value to obtain an active current reference value, a converter output modulation reference signal is obtained after current closed-loop control, and then CPS-SPWM modulation is carried out;
when the AC power grid side does not need active feedback, the converter module connected with the load absorbs active power of the AC power grid, voltage and current double closed-loop control is adopted to obtain a modulation reference signal, and CPS-SPWM modulation is carried out;
4) when the AC network side needs reactive power control, the active and reactive controllers send reactive power compensation indexes to a single no-load converter module, reactive power required to be output by each module is calculated, after the active and reactive controllers distribute reactive power required to be sent by each heavy converter, the active control link is double closed loop feedback control, and the voltage u at the DC side is controlled by a direct current voltage udcFeedback to the controller to form closed-loop control to form a voltage feedback outer loop, and active current idThe feedback plus PI regulator forms a current feedback inner loop, the reactive power control link is power outer loop current inner loop double closed loop control, and the reactive power control link is distributed to the reactive power of a single converter module
Figure BDA0002284089200000021
And a feedback value QnAfter comparison, a current reactive component reference signal i is generated by a PI regulatorqrnThe feedback signal is the reactive component i of the current of the converter moduleqn(ii) a Comparing the feedback signal with a reference signal, adjusting by using a PI control link, and obtaining a modulation reference signal of the converter by adopting dq inverse transformation on the corrected signal;
when the side of the alternating current network does not need reactive power control, the no-load converter module only adopts an active loop voltage and current double closed loop control method to maintain direct current voltage.
More specifically, the control method of CPS-SPWM modulation comprises the following steps:
1) setting N to represent the number of converter modules connected with load, and modulating triangular wave signal T when N modules are connected with load1,T2……TNPhase shifting is carried out in sequence, the time occupied by the phase shifting angle is equal to 1/N of a triangular wave period, and CPS-SPWM modulation signals are output to a converter driving circuit;
2) and (3) setting M to represent the number of converter modules connected with the no-load, and when M modules are in no-load and the electric energy quality is controlled: modulated triangular wave signal T01,T02……T0MSequentially shifting the phase, wherein the time occupied by the phase shifting angle is equal to 1/M of a triangular wave period, and CPS-SPWM modulation signals are output to a converter driving circuit to be converted intoThe current device outputs current;
3) when only M converter modules are in no-load and are not subjected to power quality control, the M converter modules do not output power;
4) when only N converter modules are connected with loads and M converter modules are arranged for power quality control, N modulated triangular wave signals T connected with the load converter modules1,T2……TNThe phase shift is carried out in sequence, and the time occupied by the phase shift angle is equal to 1/N of one triangular wave period; m converter modules which are unloaded and carry out power quality control and modulation triangular wave signal T0 thereof1,T02……T0MPhase shifting is carried out in sequence, the time occupied by the phase shifting angle is equal to 1/M of a triangular wave period, and CPS-SPWM modulation signals are output to a converter driving circuit; wherein the modulated triangular wave signal T of the loaded converter module1And modulated triangular wave signal T0 of no-load current transformer module1Are staggered with respect to each other.
The invention has the beneficial effects that:
1. the loaded converter module is adopted to judge whether the power grid needs active feedback, and the energy storage equipment of the load connected with the converter module can be effectively utilized to realize the active flexible regulation of the power grid;
2. idle load multiple converter modules are used for reactive compensation, so that the utilization rate of the converter is improved;
3. for the load condition of each converter module, under the load condition and the no-load condition, each independent CPS-SPWM modulation is adopted, and the output of a plurality of modules is superposed and synthesized to ensure that the characteristic harmonic of the output current and voltage of the no-load module or the load module is mostly higher harmonic and the least part of the characteristic harmonic is the generated characteristic harmonic of the original single converter, so that the load of a filter is reduced, and the output characteristic of the multiple bidirectional converter is improved.
Drawings
Fig. 1 is a structure and control block diagram of the current transformer module 1, 2, 3, 4 in no-load state.
Fig. 2 is a block diagram illustrating the structure and control of the inverter module 1, 2 with no load and 3, 4 with load.
Fig. 3 is a block diagram illustrating the structure and control of the inverter modules 3, 4 with no load and 1, 2 with load.
Fig. 4 is a control block diagram of the converter module of the present invention when the nth module is idle.
In fig. 1 to 4, the solid line represents presence of actual control, and the broken line represents absence of actual control.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings.
A multiple bidirectional converter with an electric energy quality control function is structurally shown in figure 1 and comprises a power grid alternating-current voltage transformer 1, an active power and reactive power controller 2, a CPS-SPWM control module, a plurality of converter modules, a total output current transformer 9, an alternating-current output bus 10 and a centralized filter 11. In this embodiment, 4 converter modules are selected.
The power grid alternating current voltage transformer 1, the active and reactive controllers 2 and the CPS-SPWM controller are sequentially connected in series, and the power grid alternating current voltage transformer 1 is also connected to a power grid. The CPS-SPWM controller can be divided into a load module CPS-SPWM and a no-load module CPS-SPWM according to the working state of the CPS-SPWM controller, when the converter module is connected with a load (namely, charging equipment), the CPS-SPWM controller connected with the converter module is changed into the load module CPS-SPWM, and when the load is cut off, the CPS-SPWM controller connected with the converter module is changed into the no-load module CPS-SPWM. The CPS-SPWM controller is used for adopting two independent carrier phase shift modulations according to the load access state of the converter module, and determining the angle size of the modulated carrier phase shift according to the load or no-load quantity.
The converter modules are connected in parallel, each converter module comprises a converter 8, an output reactor 7, a sub-output current transformer 6 and an alternating current side switch 5 which are connected in series, the converters are further coupled with a CPS-SPWM controller, and the sub-output current transformers 6 are further coupled with an active power controller 2 and a reactive power controller 2. The plurality of converter modules are coupled to an ac output bus 10, the ac output bus 10 being connected to a lumped filter 11.
And each converter is respectively coupled with an independent direct current capacitor, and the direct current side of each converter is not electrically connected. The converter module is a semiconductor power device, adopts a four-quadrant conversion circuit, and can preferably adopt an H-bridge structure in an IPM module. The sub-output current transformer 6 is used for sampling the current of each module and sending a current signal to the active and reactive controllers 2. The output reactor 7 functions to suppress harmonic currents around the converter switching frequency. The function of the lumped filter 11 is to filter out harmonic voltages around the switching frequency of the single inverter.
The total output current transformer 9 is connected to the grid, is also coupled to the active and reactive controllers 2, and is also coupled to a plurality of converter modules via ac output buses 10, respectively. The total output current transformer 9 is used for integrally calculating the total current of a plurality of converter modules and sending a total current signal to the active and reactive controllers 2
The control method of the multiple bidirectional converter with the function of energy quality treatment comprises the following steps:
1) the active controller and the reactive controller respectively detect the load access states of the converter modules and calculate the load quantity and the no-load quantity;
2) the active and reactive controllers judge whether the AC power grid side needs active feedback and whether reactive treatment is needed;
3) when the AC power grid side needs active feedback, a converter module connected with a load feeds back active power of the AC power grid, the feedback current direction of the converter module is changed, power current double closed-loop control is adopted to obtain a modulation reference signal, and then CPS-SPWM modulation is carried out;
when the AC power grid side does not need active feedback, the converter module connected with the load absorbs active power of the AC power grid, voltage and current double closed-loop control is adopted to obtain a modulation reference signal, and CPS-SPWM modulation is carried out;
4) when the AC power grid side needs reactive power control, the reactive power compensation index is sent to a single module, and the total reactive power required to be sent by the whole bidirectional converter is set to be
Figure BDA0002284089200000051
The nth heavy converter is actually requiredThe reactive emissions can be calculated according to:
Figure BDA0002284089200000052
when one of M weight is damaged or changed from no load to load, only Q is neededTotalWithout exceeding the total output capacity of the remaining modules, the total reactive output is
Figure BDA0002284089200000053
The nth no-load module needs to output no power
Figure BDA0002284089200000054
Calculated according to the following formula:
Figure BDA0002284089200000055
after the controller distributes the reactive power required by each heavy converter, the single converter is controlled in the manner shown in fig. 4. The active control link is double closed loop feedback control, and the voltage of the direct current side
Figure BDA0002284089200000056
Feedback to the controller to form closed-loop control to form a voltage feedback outer loop, and active current idThe feedback plus PI regulator forms a current feedback inner loop; the reactive power control link is current closed-loop control and is distributed to the reactive power reference value of the nth converter
Figure BDA0002284089200000057
And a feedback value QnAfter comparison, generating a reference signal of reactive component of current by a PI regulator
Figure BDA0002284089200000058
Feedback signal i of current reactive component of current converterqnForming current closed-loop control, comparing feedback signal with reference signal, regulating by PI control link, inverse-transforming corrected signal by dq, and obtaining regulationReference signals are made and then CPS-SPWM modulation is performed.
5) When the side of the AC power grid does not need reactive power treatment, the no-load module is arranged to output total reactive power
Figure BDA0002284089200000059
The nth module needs to output reactive power
Figure BDA00022840892000000510
The dc voltage is maintained only using the power voltage current double closed loop control method.
As shown in fig. 1, when the current transformer modules 1, 2, 3 and 4 are in no-load, the control method of the CPS-SPWM modulation comprises the following steps:
1) when 4 modules are unloaded and the power quality is managed: modulated triangular wave signal T01，T02，T03，T04Phase shifting is carried out in sequence, the time occupied by the phase shifting angle is equal to 1/4 of a triangular wave period, and CPS-SPWM modulation signals are output to a converter driving circuit to enable the converter to output three-phase current;
2) when only 4 modules are unloaded and the power quality control is not carried out, 4 modules do not output.
As shown in fig. 2, when the current transformer module 1, 2 is unloaded and the modules 3, 4 are loaded, the control method of the CPS-SPWM modulation comprises the following steps:
1) when 2 modules are connected with a load, a triangular wave signal T is modulated1,T2Phase shifting is carried out in sequence, the time occupied by the phase shifting angle is equal to a triangular wave period, and a CPS-SPWM modulation signal is output to a converter driving circuit;
2) when 2 modules are unloaded and the power quality is administered: modulated triangular wave signal T01,T02Phase shifting is carried out in sequence, the time occupied by the phase shifting angle is equal to 1/2 of a triangular wave period, and CPS-SPWM modulation signals are output to a converter driving circuit to enable the converter to output three-phase current;
3) when only 2 modules are unloaded and the power quality control is not carried out, the 2 modules are not output;
4) when only 2 modules connect the load and have 2 modules and carry out the power quality and administer:
a)2 modulated triangular wave signals T connected with load modules1,T2The phase shift is carried out in sequence, and the time of the phase shift angle is equal to 1/2 of one triangular wave period;
b)2 modulation triangular wave signal T0 of module for no-load and power quality control1,T02Phase shifting is carried out in sequence, the time occupied by the phase shifting angle is equal to 1/2 of a triangular wave period, and CPS-SPWM modulation signals are output to a converter driving circuit;
c) modulated triangular wave signal T with load module1And modulated triangular wave signal T0 of no load module1Are staggered with respect to each other.
As shown in fig. 3, when the current transformer module No. 3 and 4 is unloaded and the modules No. 1 and 2 are loaded, the control method of the CPS-SPWM modulation comprises the following steps:
1) when 2 modules are connected with a load, a triangular wave signal T is modulated1,T2Phase shifting is carried out in sequence, the time occupied by the phase shifting angle is equal to a triangular wave period, and a CPS-SPWM modulation signal is output to a converter driving circuit;
2) when 2 modules are unloaded and the power quality is administered: modulated triangular wave signal T01,T02Phase shifting is carried out in sequence, the time occupied by the phase shifting angle is equal to 1/2 of a triangular wave period, and CPS-SPWM modulation signals are output to a converter driving circuit to enable the converter to output three-phase current;
3) when only 2 modules are unloaded and the power quality control is not carried out, the 2 modules are not output;
4) when only 2 modules connect the load and have 2 modules and carry out the power quality and administer:
a)2 modulated triangular wave signals T connected with load modules1,T2The phase shift is carried out in sequence, and the time of the phase shift angle is equal to 1/2 of one triangular wave period;
b)2 modulation triangular wave signal T0 of module for no-load and power quality control1,T02Sequential phase shifting, time of phase shifting angle, etcAt 1/2 of a triangular wave period, outputting a CPS-SPWM modulation signal to a converter driving circuit;
c) modulated triangular wave signal T with load module1And modulated triangular wave signal T0 of no-load module1Are staggered with respect to each other.
It should be noted that the above-mentioned preferred embodiments are merely illustrative of the technical concepts and features of the present invention, and are intended to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.

Claims (5)

1. A control method of a multiple bidirectional converter with an electric energy quality control function comprises a power grid alternating current voltage transformer, an active power controller, a reactive power controller, a CPS-SPWM controller, a plurality of converter modules, an alternating current output bus and a centralized filter, and is characterized by comprising the following steps:
1) the active controller and the reactive controller respectively detect the load access states of the converter modules and calculate the load quantity and the no-load quantity;
2) the active and reactive controllers judge whether the AC power grid side needs active feedback and whether reactive treatment is needed;
3) when the AC power grid side needs active feedback, the converter module connected with the load feeds back the active power of the AC power grid, the total amount of the active power needing to be fed back is distributed to each converter module in the active power and reactive power controllers, the feedback current direction of each converter module is changed, power current double closed-loop control is adopted, the active power reference value of each module is compared with the feedback value to obtain an active current reference value, a converter output modulation reference signal is obtained after current closed-loop control, and then CPS-SPWM modulation is carried out;
when the AC power grid side does not need active feedback, the converter module connected with the load absorbs active power of the AC power grid, voltage and current double closed-loop control is adopted to obtain a modulation reference signal, and CPS-SPWM modulation is carried out;
4) when the AC network side needs reactive power control, the active and reactive controllers send reactive power compensation indexes to a single no-load converter module, reactive power required to be output by each module is calculated, after the active and reactive controllers distribute reactive power required to be sent by each heavy converter, the active control link is double closed loop feedback control, and the voltage u at the DC side is controlled by a direct current voltage udcFeedback to the controller to form closed-loop control to form a voltage feedback outer loop, and active current idThe feedback plus PI regulator forms a current feedback inner loop, the reactive power control link is power outer loop current inner loop double closed loop control, and the reactive power control link is distributed to the reactive power of a single converter module
Figure FDA0002937256800000011
And a feedback value QnAfter comparison, a current reactive component reference signal i is generated by a PI regulatorqrnThe feedback signal is the reactive component i of the current of the converter moduleqn(ii) a Comparing the feedback signal with a reference signal, adjusting by using a PI control link, and obtaining a modulation reference signal of the converter by adopting dq inverse transformation on the corrected signal;
when the side of the alternating current network does not need reactive power control, the no-load converter module only adopts an active loop voltage and current double closed loop control method to maintain direct current voltage.
2. Control method according to claim 1, characterized in that the control method of CPS-SPWM modulation comprises the steps of:
1) setting N to represent the number of converter modules connected with load, and modulating triangular wave signal T when N modules are connected with load1,T2……TNPhase shifting is carried out in sequence, the time occupied by the phase shifting angle is equal to 1/N of a triangular wave period, and CPS-SPWM modulation signals are output to a converter driving circuit;
2) and (3) setting M to represent the number of converter modules connected with the no-load, and when M modules are in no-load and the electric energy quality is controlled: modulated triangular wave signal T01,T02……T0MSequentially shifting the phase, wherein the time occupied by the phase shifting angle is equal to 1/M of a triangular wave period, and CPS-SPWM modulation signals are output to the variable currentThe converter driving circuit outputs current;
3) when only M converter modules are in no-load and are not subjected to power quality control, the M converter modules do not output power;
4) when only N converter modules are connected with loads and M converter modules are arranged for power quality control, N modulated triangular wave signals T connected with the load converter modules1,T2……TNThe phase shift is carried out in sequence, and the time occupied by the phase shift angle is equal to 1/N of one triangular wave period; m converter modules which are unloaded and carry out power quality control and modulation triangular wave signal T0 thereof1,T02……T0MPhase shifting is carried out in sequence, the time occupied by the phase shifting angle is equal to 1/M of a triangular wave period, and CPS-SPWM modulation signals are output to a converter driving circuit; wherein the modulated triangular wave signal T of the loaded converter module1And modulated triangular wave signal T0 of no-load current transformer module1Are staggered with respect to each other.
3. The control method according to claim 1, characterized in that:
the power grid alternating voltage transformer, the active and reactive controllers and the CPS-SPWM controller are sequentially connected in series, and the power grid alternating voltage transformer is also connected into a power grid;
the converter modules are connected in parallel and connected to an alternating current output bus, and the alternating current output bus is connected into a centralized filter; each converter module comprises a converter, an output reactor, a sub-output current transformer and an alternating current side switch which are connected in series, wherein the converter is also coupled with the CPS-SPWM controller, and the sub-output current transformer is also coupled with the active controller and the reactive controller;
the CPS-SPWM controller is used for adopting two independent carrier phase shift modulations according to the load access state of the converter module, and determining the angle size of the modulated carrier phase shift according to the load or no-load quantity.
4. The control method according to claim 3, characterized in that: the multiplexed bi-directional converter further includes a total output current transformer that is connected to the grid, is also coupled to the active and reactive controllers, and is also coupled to the plurality of converter modules via ac output buses, respectively.
5. The control method according to claim 3, characterized in that: and each current transformer is respectively coupled with an independent direct current capacitor.
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