CN106972505B - Mixed power electronic transformer for unified power quality control and control method thereof - Google Patents
Mixed power electronic transformer for unified power quality control and control method thereof Download PDFInfo
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- CN106972505B CN106972505B CN201710317208.XA CN201710317208A CN106972505B CN 106972505 B CN106972505 B CN 106972505B CN 201710317208 A CN201710317208 A CN 201710317208A CN 106972505 B CN106972505 B CN 106972505B
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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
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
- H02J3/1821—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators
- H02J3/1835—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control
- H02J3/1842—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control wherein at least one reactive element is actively controlled by a bridge converter, e.g. active filters
- H02J3/1857—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control wherein at least one reactive element is actively controlled by a bridge converter, e.g. active filters wherein such bridge converter is a multilevel converter
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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
- H02J3/01—Arrangements for reducing harmonics or ripples
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- 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
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- 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
Abstract
The invention discloses a hybrid power electronic transformer with a unified power quality control function and a control method thereof, wherein the power quality detection and control method is based on the topology of the combination of a traditional transformer and a power electronic converter and can be divided into the following parts: the hardware circuit is connected with: the power electronic converter consists of a multi-winding transformer and a power electronic converter, wherein the converter comprises a rectifying unit, a discharging/balancing loop unit, an inversion unit and a direct current output port; the power quality detection unit: the detection of voltage harmonic and distortion components is realized by performing park transformation on the three-phase voltage and performing inverse transformation after filtering by a filter; voltage stabilization control: collecting the voltage of the network side, comparing the voltage with a given value, adopting PI regulation double closed loop design, filtering through a filter, and finally obtaining the regulation voltage of the input network side; reactive compensation control: and finally, reactive compensation is obtained through synchronous decoupling of positive sequence and negative sequence and synchronous control of double sequences.
Description
Technical Field
The invention designs a hybrid power electronic transformer for unified power quality control and a control method thereof, and belongs to the technical field of application of power electronics in a power system.
Technical Field
Electric energy is one of the most widely used energy sources in modern society, and the application degree of the electric energy marks the development level of a country. With the rapid development of science and technology and national economy, the demand of people for electric energy is greatly increased, and meanwhile, the demand for electric energy quality is higher and higher. The quality of electric energy is important for the safe and economical operation of electric power systems and electric equipment, industrial production and product quality and maintenance of normal living order.
At present, a series of new characteristics appear in the power system: firstly, a large and ultra-large power system starts to appear, and how to ensure the safe and stable operation of the large power system is a prominent problem; secondly, renewable energy power generation technology is widely focused, a power supply of a power system is changed from a traditional power frequency alternating current form into a plurality of forms which coexist, such as a direct current power supply (photovoltaic power generation), an alternating current variable frequency power supply (wind power generation) and the like, and a series of high-power, high-efficiency and high-quality energy conversion and control problems are involved in the renewable energy power generation system; thirdly, the nonlinear load is rapidly increased, so that the power quality of the power supply is continuously reduced, and the requirements of a large number of sensitive load users on the power quality are about to be higher, so that the power quality problem is increasingly outstanding.
In the context of power systems facing these new challenges, the power transformers, which are the most basic power transmission and transformation devices of the power system, are too single in function making it increasingly difficult to meet the requirements of modern power systems. Moreover, conventional power transformers suffer from drawbacks including: the volume and the weight are large, and the transformer insulating oil threatens the environment; the no-load loss is high, and the output voltage is easy to drop when the load is carried; when the load side fails, the fault cannot be isolated, so that the fault is expanded; when a nonlinear load is carried out, distortion current is coupled into a power grid through a transformer, so that pollution is caused to the power grid; when the voltage of the power supply side is disturbed, the voltage is transmitted to the load side, so that the influence on sensitive load is caused; related equipment which is matched with the device is needed to protect the device; in addition, when the iron core is saturated, harmonic waves are generated, and when the iron core is put into a power grid, large excitation surge currents are caused. Therefore, how to functionally innovate the power transformer, realizing another leap of transformer technology, so that the transformer meets various new requirements of modern and future power systems, is a valuable theoretical topic and practical topic, and is a new challenge facing a large number of researchers. Therefore, since the 20 th century, students at home and abroad are actively exploring and researching a novel power transformer.
Disclosure of Invention
The invention aims to: aiming at the topology of the hybrid power electronic transformer and key control technology thereof, researches are made on the aspects of topology, power quality detection, voltage stability control, reactive compensation control and the like. The invention aims to provide a hybrid power electronic transformer with a unified power quality control function and a control method thereof, wherein the hybrid power electronic transformer has basic functions of power transmission, voltage conversion and the like, and also has novel functions of power quality detection and control, and the functions realize voltage stabilization, harmonic filtering and reactive compensation on the basis of novel topology through a PI double closed loop control strategy and a positive sequence and negative sequence reactive synchronous control strategy so as to effectively control the power quality, thereby overcoming the defects of the prior art.
The technical scheme is as follows: in order to achieve the aim of the invention, the invention adopts a voltage stabilization control and reactive compensation control method based on a specific hybrid power electronic transformer topology with a unified power quality control function.
The mixed power electronic transformer comprises a multi-winding power frequency transformer suitable for a medium-voltage alternating-current distribution network, a series-parallel back-to-back converter suitable for triangle connection and star connection, and a main loop power quality detection method and a control method suitable for the mixed power electronic transformer;
the power frequency transformer comprises three windings, wherein the first winding is connected with a 10kV alternating current power distribution network, a second winding main loop is used as a 400V power distribution network to be connected with an output side of a converter in series, then is connected with a common load, and the third winding is connected with a power electronic converter;
the power electronic converter is of a two-level back-to-back structure and comprises an AC/DC rectifying unit, a DC/AC inversion unit, LC filtering units on two sides, a discharging/balancing loop unit and a direct current output port, wherein the rectifying unit and the inversion unit are of a three-phase full-bridge structure, a front-stage rectifying unit, a discharging/balancing loop unit and a rear-stage inversion unit are sequentially connected, and the direct current output port is connected in parallel with two ends of an outlet of a discharging balancing loop;
the output port of the hybrid power electronic converter is coupled with the load end of the second winding in series through a transformer, the rectifying unit has reactive compensation and harmonic wave treatment capacity, and the inverting unit has voltage regulation capacity;
the hybrid power electronic converter comprises an electric energy quality detection unit, wherein network side three-phase voltage u is firstly collected sa 、u sb 、u sc Through dq 0 The orthogonal coordinate transformation is carried out to obtain active, reactive and zero sequence components, then active and reactive signals are filtered to obtain active and reactive direct current components, the obtained active, reactive and zero sequence components are subjected to the orthogonal coordinate inverse transformation to obtain harmonic voltage components, and the voltage on the network side is subtracted by the harmonic components to obtain voltage harmonics and distortion components;
the control method for the electric energy quality control comprises a control method combining voltage stabilization control and reactive compensation control, wherein a voltage stabilization control unit collects network side voltage u s And load terminal voltage u l In u lref For a given reference voltage and u l Difference is made, and the obtained value is regulated by PI and then is regulated by u lref And u s The difference is added and the filtered current after gain is subtracted, and the obtained signal passes through an inverter k i Then obtains the inversion voltage u i Superimposed filter voltage negative feedback u c Filtering in a filter, negatively feeding back the obtained filtering voltage through filtering current, and finally outputting an adjusting voltage delta u after n times of gain;
the reactive compensation control unit collects three-phase voltage of a power grid, and performs positive sequence d-q orthogonal coordinate transformation and negative sequence d-q orthogonal coordinate transformation on the three-phase voltage to obtain positive sequence active and reactive componentsNegative sequence active and reactive componentsMeanwhile, the unit collects three-phase current of the power grid, and performs positive sequence d-q orthogonal coordinate transformation and negative sequence d-q orthogonal coordinate transformation respectively to obtain a positive sequence reactive current signal +.>And negative-sequence active and reactive signals +.>The feedback current signal at the inversion side of the unit obtains positive sequence and negative sequence active and reactive current instantaneous values through positive sequence d-q orthogonal coordinate transformation and negative sequence d-q orthogonal coordinate transformation>Instantaneous value u of DC side voltage dc And a reference value u dcref Difference is used as positive sequence active current reference value after passing through PI regulator>The load side current is transformed by positive sequence d-q coordinates to obtain a positive sequence reactive current reference value +.>The units adopt positive sequence and negative sequence synchronous control, the positive sequence reactive component is compensated by adopting a positive sequence conversion controller rotating at the frequency omega, and a positive sequence voltage control instruction signal is obtained>And->Negative sequence conversion controller compensation of negative sequence component rotated by-omega to obtain negative sequence voltage control instruction signal/>Converting the negative sequence voltage command signal into a positive sequence d-q coordinate system to obtain a voltage command signal input into the SVPWM module>And->The two controllers work simultaneously to finish the control of the electric energy quality.
The topology comprises the following structure:
a. the multi-winding transformer comprises three windings, wherein a first winding (1) is connected with a network side, a second winding (2) is used as a transformer at the output side of the main loop series converter and then is connected with a common load, and a third winding (3) is connected with the power electronic converter;
b. the first end and the last end of the main loop are connected with bypasses, and the two ends of the main loop are connected with bypass switches;
c. the front-stage AC/DC rectifying unit of the power electronic converter comprises 6 IGBTs and 6 anti-parallel diodes, each two IGBTs and the anti-parallel diodes are connected in series end to form a bridge arm, the front-stage three-phase full bridge consists of three bridge arms, the middle point of each bridge arm is connected with a third winding (3) of the multi-winding transformer, and the front-stage three-phase full bridge output stage is connected with a discharge/balance loop;
d. two ends of the converter are respectively connected with a group of filters, a bypass switch is added at the beginning end of the converter, and meanwhile, a main loop series transformer is connected in parallel to switch thyristors;
e. the discharging/balancing loop unit comprises 2 IGBTs and 2 capacitors, the two IGBTs are connected in series, the two capacitors are connected in series, the connected IGBTs and capacitors are connected in parallel, a resistor is connected between the midpoint of the connected IGBTs and the midpoint of the connected capacitors, the midpoint of the connected capacitors is grounded, and the output stage of the discharging/balancing loop unit is connected with the rear-stage DC/AC inversion unit;
f. the direct current output port is connected in parallel with the two ends of the output stage of the discharging/balancing loop unit and is used for connecting a direct current load and a distributed energy source;
g. the back-stage DC/AC inversion unit comprises 6 IGBTs and 6 anti-parallel diodes, each two IGBTs and the anti-parallel diodes are connected in series end to form a bridge arm, the back-stage three-phase full bridge comprises three bridge arms, and the middle point lead of each bridge arm is used as an output port of the power electronic converter;
h. the output port of the power electronic converter is coupled with the load end of the second winding (2) through a transformer, so that the effect of controlling the electric energy quality is achieved.
The method for detecting the electric energy quality comprises the following steps:
first step, collecting three-phase voltage u at the network side sa 、u sb 、u sc Obtaining active, reactive and zero sequence components through dq0 orthogonal coordinate transformation;
step two, the active and reactive signals pass through a filter to obtain active and reactive direct current components;
thirdly, performing orthogonal coordinate inverse transformation on the obtained active, reactive and zero sequence components to obtain harmonic voltage components;
and fourthly, subtracting the harmonic component from the network side voltage to obtain a voltage harmonic and distortion component.
The control method combining the voltage stabilization control and the reactive compensation control comprises the voltage stabilization control and the reactive compensation control.
The voltage stabilization control includes:
a. collecting network side voltage u s And a load side voltage u l Given value u lref And u is equal to l Making difference, feeding into PI regulator to make regulation, at the same time making given value u lref And u is equal to s Making a difference;
b. output signal of PI regulator and given value u lref And u s The difference is added and subtracted by K c A multiplied filtered current value is passed through the inverter gain k i After subtracting the filtering voltage, the signal enters a filter;
c. the signal is filtered by the filter and then is subjected to load end voltage negative feedback, and after n times of gain, the voltage delta u of the injection power grid is output. The reactive compensation control includes:
a. collecting three-phase voltage u of power grid sa 、u sb 、u sc Three-phase current i sa 、i sb 、i sc Three-phase current i on inversion side of control unit ca 、i cb 、i cc Respectively carrying out positive sequence d-q orthogonal coordinate transformation and negative sequence d-q orthogonal coordinate transformation on the three groups of voltages and currents to obtain positive sequence active and reactive componentsNegative sequence active and reactive components +.>Positive sequence reactive current signalAnd negative-sequence active and reactive signals +.>Positive and negative sequence active and reactive current instantaneous values +.>
i. Collecting control unit direct current side voltage u dc And is connected with a given value u dcref After the difference is made, the positive sequence active current reference value is output by entering a PI regulator for regulation
j. The positive sequence reactive component is compensated by adopting a positive sequence conversion controller rotating at the frequency omega, and a positive sequence voltage control instruction signal is obtained through current decouplingAnd->Negative sequence component is compensated by a negative sequence conversion controller rotating by-omega, and a negative sequence voltage control instruction signal is obtained through current decoupling>
d. Converting the negative sequence voltage command signal into a positive sequence d-q coordinate system to obtain a voltage command signal input into the SVPWM moduleAnd->The two controllers work simultaneously to finish the control of the electric energy quality.
The beneficial effects are that: the hybrid power electronic transformer with the unified power quality control function and the control method thereof can effectively inhibit unbalance degree and harmonic pollution of a power grid, prevent voltage drop, and simultaneously have reactive compensation function and stable direct current output function, so that various indexes of power quality are greatly improved.
Drawings
FIG. 1 hybrid power electronic transformer topology
FIG. 2 Power quality detection method
FIG. 3 dynamic voltage regulation control
FIG. 4 static var compensation control
In the figure: wherein: 1-a first winding; 2-a second winding; 3-third winding.
Detailed Description
The invention will be further described with reference to the accompanying drawings
The invention relates to a multi-winding transformer and a power electronic converter, wherein a third winding (3) adopts two connection modes including star connection and triangle connection, the power electronic converter adopts a control mode combining dynamic regulation and static regulation, and the mixed power electronic transformer with a unified power quality control function and a control method thereof are specifically implemented as follows:
the electric energy quality detection control process is shown in fig. 2, firstly, the network side three-phase voltage u is collected sa 、u sb 、u sc The active, reactive and zero sequence components u are obtained through dq0 orthogonal coordinate transformation d 、u q 、u 0 Will then haveThe active and reactive signals pass through a filter to obtain active and reactive direct current componentsPerforming orthogonal coordinate inverse transformation on the obtained active, reactive and zero sequence components to obtain a harmonic voltage component u af 、u bf 、u cf The voltage on the net side minus the harmonic component is the voltage harmonic and distortion component u ah 、u bh 、u ch ；
The voltage stabilization control process is as shown in fig. 3, PI double closed-loop control is adopted, and the collected network side voltage and load side voltage are subjected to PI regulation and filter filtering to finally obtain compensation output voltage delta u injected into the network side;
the reactive compensation control scheme is shown in fig. 4. Collecting three-phase voltage of a power grid, and carrying out positive sequence d-q orthogonal coordinate transformation and negative sequence d-q orthogonal coordinate transformation on the three-phase voltage to obtain positive sequence active and reactive componentsNegative sequence active and reactive components +.>Meanwhile, the unit collects three-phase current of the power grid, and performs positive sequence d-q orthogonal coordinate transformation and negative sequence d-q orthogonal coordinate transformation respectively to obtain a positive sequence reactive current signal +.>And negative-sequence active and reactive signals +.>The feedback current signal at the inversion side of the unit obtains positive sequence and negative sequence active and reactive current instantaneous values through positive sequence d-q orthogonal coordinate transformation and negative sequence d-q orthogonal coordinate transformation>Instantaneous value u of DC side voltage dc And a reference value u dcref Difference is used as positive sequence active current reference value after passing through PI regulator>The load side current is transformed by positive sequence d-q coordinates to obtain a positive sequence reactive current reference value +.>The unit adopts a positive sequence and negative sequence synchronous control strategy, the positive sequence reactive component is compensated by a positive sequence conversion controller rotating at the frequency omega, and a positive sequence voltage control instruction signal is obtained>And->Negative sequence component is compensated by a negative sequence conversion controller rotating by-omega to obtain a negative sequence voltage control instruction signal +.>Converting the negative sequence voltage command signal into a positive sequence d-q coordinate system to obtain a voltage command signal input into the SVPWM module>And->The two controllers work simultaneously to complete reactive component compensation of positive sequence and negative sequence.
The foregoing is only a preferred embodiment of the invention, it being noted that: as will be apparent to one of ordinary skill in the art; modifications and alterations may be made without departing from the principles of this invention, and such modifications and alterations should also be considered as being within the scope of the invention.
Claims (3)
1. A control method of a hybrid power electronic transformer for unified power quality control is characterized by comprising the following steps: the method is based on the topology of the combination of the traditional transformer and the power electronic converter, and comprises a multi-winding power frequency transformer, a series-parallel back-to-back converter with triangular connection and star connection, and a main loop power quality detection method and a control method of the hybrid power electronic transformer, which are applicable to a medium-voltage alternating current distribution network;
the power frequency transformer comprises three windings, wherein a first winding (1) is connected with a 10kV alternating current power distribution network, a second winding (2) is connected with a common load after being connected with the output side of a converter in series as a 400V distribution network, and a third winding (3) is connected with a power electronic converter;
the power electronic converter is of a two-level back-to-back structure and comprises an AC/DC rectifying unit, a DC/AC inversion unit, LC filtering units on two sides, a discharging/balancing loop unit and a direct current output port, wherein the rectifying unit and the inversion unit are of a three-phase full-bridge structure, a front-stage rectifying unit, a discharging/balancing loop unit and a rear-stage inversion unit are sequentially connected, and the direct current output port is connected in parallel with two ends of an outlet of a discharging balancing loop;
the output port of the hybrid power electronic converter is coupled with the load end of the second winding (2) in series through a transformer, the rectifying unit has reactive compensation and harmonic wave treatment capacity, and the inverting unit has voltage regulation capacity;
the hybrid power electronic converter comprises an electric energy quality detection unit, wherein network side three-phase voltage u is firstly collected sa 、u sb 、u sc Through dq 0 The orthogonal coordinate transformation is carried out to obtain active, reactive and zero sequence components, then active and reactive signals are filtered to obtain active and reactive direct current components, the obtained active, reactive and zero sequence components are subjected to the orthogonal coordinate inverse transformation to obtain harmonic voltage components, and the voltage on the network side is subtracted by the harmonic components to obtain voltage harmonics and distortion components;
the control method for the electric energy quality control comprises a control method combining voltage stabilization control and reactive compensation control, wherein a voltage stabilization control unit collects network side voltage u s And load terminal voltage u l In u rfel For a given reference voltage and u l Difference is made, and the obtained value is regulated by PI and then is regulated by u lref And u s The difference is added and the filtered current after gain is subtracted, and the obtained signal passes through an inverter k i Then obtains the inversion voltage u i Superimposed filter voltage negative feedback u c Filtering in a filter to obtain filtered voltageCurrent negative feedback, and finally, outputting an adjusting voltage delta u after n times of gain;
the reactive compensation control unit collects three-phase voltage of a power grid, and performs positive sequence d-q orthogonal coordinate transformation and negative sequence d-q orthogonal coordinate transformation on the three-phase voltage to obtain positive sequence active and reactive components Negative sequence active and reactive components +.>Meanwhile, the unit collects three-phase current of the power grid, and performs positive sequence d-q orthogonal coordinate transformation and negative sequence d-q orthogonal coordinate transformation respectively to obtain a positive sequence reactive current signal +.>And negative-sequence active and reactive signals +.>The feedback current signal of the inversion side of the unit is transformed by positive sequence d-q orthogonal coordinate transformation and negative sequence d-q orthogonal coordinate transformation to obtain positive sequence and negative sequence active and reactive current instantaneous valuesInstantaneous value u of DC side voltage dc And a reference value u dcref Difference is used as positive sequence active current reference value after passing through PI regulator>The load side current is transformed by positive sequence d-q coordinates to obtain a positive sequence reactive current reference value +.>The units adopt positive sequence and negative sequence synchronous control, the positive sequence reactive component is compensated by adopting a positive sequence conversion controller rotating at the frequency omega, and a positive sequence voltage control instruction signal is obtained>And->Negative sequence component is compensated by a negative sequence conversion controller rotating by-omega to obtain a negative sequence voltage control instruction signal +.> Converting the negative sequence voltage command signal into a positive sequence d-q coordinate system to obtain a voltage command signal input into the SVPWM module>And->The two controllers work simultaneously to finish the control of the electric energy quality.
2. The control method of a hybrid power electronic transformer for unified power quality control according to claim 1, wherein: the topology comprises the following structure:
a. the multi-winding transformer comprises three windings, wherein a first winding (1) is connected with a network side, a second winding (2) is used as a transformer at the output side of the main loop series converter and then is connected with a common load, and a third winding (3) is connected with the power electronic converter;
b. the first end and the last end of the main loop are connected with bypasses, and the two ends of the main loop are connected with bypass switches;
c. the front-stage AC/DC rectifying unit of the power electronic converter comprises 6 IGBTs and 6 anti-parallel diodes, each two IGBTs and the anti-parallel diodes are connected in series end to form a bridge arm, the front-stage three-phase full bridge consists of three bridge arms, the middle point of each bridge arm is connected with a third winding (3) of the multi-winding transformer, and the front-stage three-phase full bridge output stage is connected with a discharge/balance loop;
d. two ends of the converter are respectively connected with a group of filters, a bypass switch is added at the beginning end of the converter, and meanwhile, a main loop series transformer is connected in parallel to switch thyristors;
e. the discharging/balancing loop unit comprises 2 IGBTs and 2 capacitors, the two IGBTs are connected in series, the two capacitors are connected in series, the connected IGBTs and capacitors are connected in parallel, a resistor is connected between the midpoint of the connected IGBTs and the midpoint of the connected capacitors, the midpoint of the connected capacitors is grounded, and the output stage of the discharging/balancing loop unit is connected with the rear-stage DC/AC inversion unit;
f. the direct current output port is connected in parallel with the two ends of the output stage of the discharging/balancing loop unit and is used for connecting a direct current load and a distributed energy source;
g. the back-stage DC/AC inversion unit comprises 6 IGBTs and 6 anti-parallel diodes, each two IGBTs and the anti-parallel diodes are connected in series end to form a bridge arm, the back-stage three-phase full bridge comprises three bridge arms, and the middle point lead of each bridge arm is used as an output port of the power electronic converter;
h. the output port of the power electronic converter is coupled with the load end of the second winding (2) through a transformer, so that the effect of controlling the electric energy quality is achieved.
3. The control method of a hybrid power electronic transformer for unified power quality control according to claim 1, wherein: the method for detecting the electric energy quality comprises the following steps:
first step, collecting three-phase voltage u at the network side sa 、u sb 、u sc Obtaining active, reactive and zero sequence components through dq0 orthogonal coordinate transformation;
step two, the active and reactive signals pass through a filter to obtain active and reactive direct current components;
thirdly, performing orthogonal coordinate inverse transformation on the obtained active, reactive and zero sequence components to obtain harmonic voltage components;
and fourthly, subtracting the harmonic component from the network side voltage to obtain a voltage harmonic and distortion component.
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