CN111092446A - Decoupling control-based electric energy router high-voltage alternating-current port multifunctional form implementation method - Google Patents

Decoupling control-based electric energy router high-voltage alternating-current port multifunctional form implementation method Download PDF

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CN111092446A
CN111092446A CN201911174686.5A CN201911174686A CN111092446A CN 111092446 A CN111092446 A CN 111092446A CN 201911174686 A CN201911174686 A CN 201911174686A CN 111092446 A CN111092446 A CN 111092446A
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current
port
positive sequence
hvac
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CN111092446B (en
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文武松
赵争鸣
袁立强
聂金铜
孙晓瑛
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Tsinghua University
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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
    • H02J3/26—Arrangements for eliminating or reducing asymmetry in polyphase networks
    • 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
    • H02J3/1821—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators
    • 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
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
    • H02J3/48—Controlling the sharing of the in-phase component
    • 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
    • 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
    • Y02E40/50—Arrangements for eliminating or reducing asymmetry in polyphase networks

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Supply And Distribution Of Alternating Current (AREA)
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Abstract

The invention discloses a method for realizing multifunctional forms of a high-voltage alternating-current port of an electric energy router. The average active power of each phase is independently controlled by injecting fundamental wave negative sequence current into the high-voltage alternating-current port, and the three-phase direct-current bus voltage is ensured to be balanced when the three-phase power grid voltage is unbalanced or the active loads carried between phases of the high-voltage alternating-current port are unbalanced. And the reactive power compensation function is realized by considering the negative sequence reactive component. In a current control loop under a positive sequence dq rotating coordinate system, a fundamental positive sequence component and a higher harmonic component of high-voltage alternating-current port current are controlled in a unified mode, and a harmonic treatment function is achieved while the fundamental positive sequence current is adjusted.

Description

Decoupling control-based electric energy router high-voltage alternating-current port multifunctional form implementation method
Technical Field
The invention relates to the technical field of power electronic equipment, in particular to a method for realizing multifunctional forms of a high-voltage alternating-current port of an electric energy router.
Background
An Electric Energy Router (EER) can realize flexible interconnection among different power systems, and is an effective component for constructing a future smart grid. The EER has the basic functions of voltage conversion, electrical isolation, energy transmission and the like of the traditional transformer, can form a plug-and-play energy port for distributed renewable energy and storage equipment, realizes free access and disconnection of a power system, can flexibly control bidirectional power flow of each port to realize reasonable energy dispatching, and has fault isolation capability and the like. In addition, a high-voltage alternating-current (HVAC) port in the EER is often connected to a medium (high) voltage power system, and should have dual functions of reactive power compensation and harmonic suppression.
A typical HVAC port modular topology is shown in fig. 1, in which a rectifying side of the HVAC port modular topology adopts a cascade H-bridge structure, a Dual Active Bridge (DAB) DC/DC converter is used for electrical isolation and power bidirectional transfer, and low-voltage sides of the DAB are connected in parallel to form a three-phase low-voltage DC bus for connecting with other ports of the EER. Therefore, unlike a single function static synchronous reactive compensation (STATCOM) or Active Power Filter (APF) device, the HVAC port should also have the capability of transmitting active power to other ports in the EER, based on which the conventional STATCOM or APF control method cannot be directly applied to the HVAC port of the EER. How to realize three kinds of functional forms of active power following, reactive compensation and harmonic wave treatment simultaneously on the HVAC port, there are the following problems that need to be solved simultaneously:
(1) when the grid voltage or the three-phase active load of the HVAC port is unbalanced, how to control the HVAC three-phase active power is used for stabilizing the three-phase average direct-current bus voltage and balancing the direct-current bus voltage of each phase.
(2) How to implement reactive power compensation control when considering HVAC port voltage and current imbalances.
(3) Under the condition of power grid voltage and current distortion, how to control harmonic current and realize the harmonic treatment function.
Disclosure of Invention
Aiming at the problems, the invention provides a method for realizing a multifunctional form of a high-voltage alternating current port (HVAC port) of an Electric Energy Router (EER) based on decoupling control, which simultaneously realizes triple functional forms of active power following, reactive power compensation and harmonic wave treatment at the HVAC port of the EER, and the method comprises the following steps:
(1) the power outer loop control process: under the condition of unbalanced grid voltage or port active load, positive sequence and negative sequence decoupling is carried out on input instantaneous active power of an HVAC port, independent control of average active power of each phase is realized by injecting fundamental negative sequence current into the HVAC port according to the distribution rule of the decoupled average active power component in three phases a, b and c, stable control is carried out on total average active power of the three phases by injecting fundamental positive sequence current into the HVAC port, and reactive power compensation control is realized by considering negative sequence reactive component;
(2) the current inner loop control process: under a positive sequence dq rotating coordinate system, uniformly controlling a port current fundamental wave positive sequence component and a higher harmonic component to realize a harmonic treatment function; and under a negative sequence dq rotating coordinate system, controlling a port current fundamental wave negative sequence component.
Further, in the power outer loop control process, the method for stably controlling the total average active power of the three phases is to inject a fundamental positive sequence current into an HVAC port to realize the balance between the total input average active power of the three phases of the HVAC port and the total active load of the three phases carried by the HVAC port, so as to control the three-phase average dc bus voltage of the HVAC port to be equal to a set reference voltage
Figure BDA0002289650400000021
And the method for performing stable control comprises the following steps:
the first step is as follows: calculating the reference voltage
Figure BDA0002289650400000022
And the measured value of the three-phase average DC bus voltage
Figure BDA0002289650400000023
Error value of (2), i.e.
Figure BDA0002289650400000024
Using the error value as PI controller PIudcAn input of the PI controller PIudcThe output value of (1) is the total average active power reference of three phases
Figure BDA0002289650400000025
The second step is that: according to the total average active power reference of the three phases
Figure BDA0002289650400000026
Calculating the fundamental positive sequence active current component to be injected according to the following formula
Figure BDA0002289650400000027
The current is the fundamental wave positive sequence active current reference value of the current inner loop controller,
Figure BDA0002289650400000031
wherein the content of the first and second substances,
Figure BDA0002289650400000032
the measured value of the grid voltage fundamental wave positive sequence component is obtained;
still further, in the power outer loop control process, a method for realizing independent control of average active power of each phase is to inject fundamental negative sequence current into an HVAC port to independently control the average active power of each phase of the HVAC port, so as to ensure that three-phase direct current bus voltages of the HVAC port are balanced with each other when three-phase grid voltage is unbalanced or active loads carried by phases of the HVAC port are unbalanced, and the method for realizing independent control comprises the following steps:
the first step is as follows:calculating the reference voltage
Figure BDA0002289650400000033
Measured value of mean DC bus voltage of m-th phase module
Figure BDA0002289650400000034
Error value of (2), i.e.
Figure BDA0002289650400000035
Using the error value as PI controller PIclusterAn input of the PI controller PIclusterThe output value of the (m) th phase average active power deviation value
Figure BDA0002289650400000036
Wherein m is a, b or c;
the second step is that: calculating the actual value of the fundamental positive sequence component of the HVAC port current
Figure BDA0002289650400000037
And
Figure BDA0002289650400000038
electric network voltage fundamental wave negative sequence component measured value
Figure BDA0002289650400000039
And
Figure BDA00022896504000000310
average power component produced
Figure BDA00022896504000000311
The formula is as follows:
Figure BDA00022896504000000312
the third step: calculating an average active power reference vector generated by the HVAC port current fundamental wave negative sequence component and the grid voltage fundamental wave positive sequence component, wherein the formula is as follows:
Figure BDA00022896504000000313
the fourth step: according to the average active power reference vector
Figure BDA00022896504000000314
Calculating the fundamental negative-sequence current component to be injected according to the following formula
Figure BDA00022896504000000315
And
Figure BDA00022896504000000316
the current component is the fundamental negative-sequence current reference value in the current inner loop control,
Figure BDA0002289650400000041
further, in the power outer loop control process, the method for realizing reactive power compensation control comprises the following steps:
the first step is as follows: according to the measured value of the negative sequence component of the port current fundamental wave
Figure BDA0002289650400000042
And
Figure BDA0002289650400000043
measured value of fundamental negative sequence component of power grid voltage
Figure BDA0002289650400000044
And
Figure BDA0002289650400000045
calculating the negative sequence reactive power component
Figure BDA0002289650400000046
The formula is as follows:
Figure BDA0002289650400000047
the second step is that: according to the reactive power set value
Figure BDA0002289650400000048
And said negative sequence reactive power component
Figure BDA0002289650400000049
Calculating a positive sequence reactive power component reference value
Figure BDA00022896504000000410
The formula is as follows:
Figure BDA00022896504000000411
the third step: according to the formula
Figure BDA00022896504000000412
Calculating the fundamental positive sequence reactive current component to be injected
Figure BDA00022896504000000413
The current component
Figure BDA00022896504000000414
Namely the fundamental positive sequence reactive current reference value in the current inner loop control.
Preferably, in the current inner loop control process, under the positive sequence dq rotation coordinate system, the method for implementing the harmonic suppression function includes the following steps:
the first step is as follows: calculating a positive sequence current control loop reference value to compensate a network side load harmonic current vector ilhMake the system current vector isDoes not contain higher harmonic current component, realizes the harmonic treatment function, and synthesizes vector i to HVAC port currentbhPerforming unified control, the resultant vector ibhIs a fundamental positive sequence vector i+And higher harmonic vector ithSumming; controlled to form a vector ibhThe reference values for the positive sequence d-axis and positive sequence q-axis components are:
Figure BDA00022896504000000415
wherein the content of the first and second substances,
Figure BDA00022896504000000416
and
Figure BDA00022896504000000417
for net side load current ilHigher harmonic vector i oflhMeasured values of components at positive sequence d-axis and positive sequence q-axis;
the second step is that: calculating an error value between the reference value and the measured value of the composite vector, i.e.
Figure BDA00022896504000000418
And
Figure BDA00022896504000000419
using the error value as a positive sequence current controller
Figure BDA0002289650400000051
The input value of (a), wherein,
Figure BDA0002289650400000052
is a PI controller, and is used as a power supply,
Figure BDA0002289650400000053
as a sum of a plurality of vector PI controllers, i.e.
Figure BDA0002289650400000054
The third step: controller for calculating positive sequence current
Figure BDA0002289650400000055
Output value of
Figure BDA0002289650400000056
Vector u synthesized with grid voltagesbhMeasured values of positive sequence d-axis and positive sequence q-axis components
Figure BDA0002289650400000057
Sum of the above-mentioned composite vectors usbhIs the fundamental positive sequence vector
Figure BDA0002289650400000058
And higher harmonic vector
Figure BDA0002289650400000059
To sum, i.e.
Figure BDA00022896504000000510
This value is the positive sequence reference value for the HVAC port bridge arm voltage.
The method for realizing the multifunctional form of the high-voltage alternating-current port of the electric energy router provided by the invention has the following advantages:
(1) the influence of nonideal factors such as unbalanced voltage of a power grid, unbalanced active load of a port, higher harmonic distortion of voltage and current and the like is comprehensively considered.
(2) And the triple functional forms of active power following, reactive power compensation and harmonic suppression are realized. Wherein, the reactive power compensation and the harmonic control function can be forbidden or enabled at will on line.
Drawings
FIG. 1 is a schematic diagram of a typical HVAC port modular topology and operating conditions of an EER;
fig. 2 is a block diagram of a three-phase total average active power stability control proposed by the present invention;
fig. 3 is a block diagram of the three-phase average active power independent control proposed by the present invention;
FIG. 4 is a block diagram of reactive compensation control according to the present invention;
FIG. 5 is a block diagram of fundamental positive sequence current and higher harmonic current control according to the present invention;
FIG. 6 is a block diagram of the fundamental negative-sequence current control proposed by the present invention;
fig. 7 is a block diagram of a global implementation proposed by the present invention.
Detailed Description
The invention provides a method for realizing the multifunctional form of a high-voltage alternating-current port of an electric energy router, which comprehensively considers non-ideal factors such as unbalanced voltage of a power grid, unbalanced active load of the port, higher harmonic distortion of the voltage and the current and the like, and can simultaneously realize the three functional forms of active power following, reactive power compensation and harmonic control at an HVAC port of an EER based on the decoupling control of average active power and port current. The detailed implementation of the present invention is introduced to the HVAC port topology and operating condition of the EER shown in fig. 1 as follows:
(1) decoupling and extraction of grid voltage, port current and grid side load current
Considering the imbalance, the grid voltage and HVAC port current can be expressed as:
Figure BDA0002289650400000061
i＝ibh+i-，
Figure BDA0002289650400000062
ibh＝i++ith
wherein u issIn the form of a grid voltage vector,
Figure BDA0002289650400000063
is a positive sequence vector of a fundamental wave of the power grid voltage,
Figure BDA0002289650400000064
is a negative sequence vector of a fundamental wave of the power grid voltage,
Figure BDA0002289650400000065
is a network voltage higher harmonic vector, i is a port current vector, i+Is a port current fundamental positive sequence vector, i-Port current fundamental negative sequence vector, ithIs the port current higher harmonic vector. For u is pairedsOr the fundamental positive sequence component and the higher harmonic component in the i are considered together to form a composite vector usbh、ibh。
Under the positive sequence dq rotation coordinate system, for a power grid voltage vector usPort current i and net side load current ilDq decoupling is carried out, and a synthetic vector u of the power grid voltage is extractedsbhDq component of
Figure BDA0002289650400000066
And
Figure BDA0002289650400000067
resultant vector i of port currentbhDq component of
Figure BDA0002289650400000068
And
Figure BDA0002289650400000069
grid voltage fundamental positive sequence vector
Figure BDA00022896504000000610
Dq component of
Figure BDA00022896504000000611
And
Figure BDA00022896504000000612
port current fundamental positive sequence vector i+Dq component of
Figure BDA00022896504000000613
And
Figure BDA00022896504000000614
higher harmonic vector i of network side load currentlhDq component of
Figure BDA00022896504000000615
And
Figure BDA00022896504000000616
namely, it is
Figure BDA00022896504000000617
And
Figure BDA00022896504000000618
synthesizing a vector u for the grid voltagesbhThe measured values of the components in the positive sequence d-axis and positive sequence q-axis,
Figure BDA00022896504000000619
and
Figure BDA00022896504000000620
synthesizing vector i for port currentbhThe measured values of the components in the positive sequence d-axis and positive sequence q-axis,
Figure BDA00022896504000000621
and
Figure BDA00022896504000000622
for positive sequence vector of fundamental wave of network voltage
Figure BDA00022896504000000623
The measured values of the components in the positive sequence d-axis and positive sequence q-axis,
Figure BDA00022896504000000624
and
Figure BDA00022896504000000625
is a port current fundamental positive sequence vector i+The measured values of the components in the positive sequence d-axis and positive sequence q-axis,
Figure BDA00022896504000000626
and
Figure BDA00022896504000000627
for higher harmonic vectors i of the net side load current illhMeasured values of components in positive sequence d-axis and positive sequence q-axis.
Under a negative sequence dq rotation coordinate system, a grid voltage vector u is subjected tosDq decoupling is carried out on the sum port current i, and a grid voltage fundamental wave negative sequence vector is extracted
Figure BDA00022896504000000628
Dq component of
Figure BDA00022896504000000629
And
Figure BDA00022896504000000630
port current fundamental negative sequence vector i-Dq component of
Figure BDA00022896504000000631
And
Figure BDA00022896504000000632
and
Figure BDA00022896504000000633
for grid voltage fundamental negative sequence vector
Figure BDA0002289650400000071
The measured values of the components in the negative sequence d-axis and negative sequence q-axis,
Figure BDA0002289650400000072
and
Figure BDA0002289650400000073
is a port current fundamental negative sequence vector i-Measured values of components in negative sequence d-axis and negative sequence q-axis.
(2) Active power following implementation method
1) HVAC Port three-phase Total average active Power stability control
The three-phase total input average active power of the HVAC port and the three-phase total active load balance carried by the HVAC port are realized by injecting fundamental wave positive sequence current, so that the three-phase average direct current bus voltage of the HVAC port is controlled to be equal to the set reference voltage
Figure BDA0002289650400000074
Are equal. The control block diagram is shown in fig. 2.
The first step is as follows: calculating a reference voltage
Figure BDA0002289650400000075
Measured value of three-phase average DC bus voltage
Figure BDA0002289650400000076
Error value of (2), i.e.
Figure BDA0002289650400000077
Using the error value as PI controller PIudcAn input of the PI controller PIudcThe output value of (1) is the total average active power reference of three phases
Figure BDA0002289650400000078
The second step is that: according to the total average active power reference of three phases
Figure BDA0002289650400000079
Calculating the fundamental positive sequence active current component to be injected
Figure BDA00022896504000000710
The current is the fundamental wave positive sequence active current reference value of the current inner loop controller.
2) HVAC Port three-phase average active power independent control
The average active power of each phase of the HVAC port is independently controlled by injecting fundamental negative sequence current, and the three-phase direct current bus voltage is ensured to be balanced when the three-phase power grid voltage is unbalanced or the active load carried by the HVAC port phases is unbalanced. The control block diagram is shown in fig. 3.
The first step is as follows: calculating a reference voltage
Figure BDA00022896504000000711
Measured value of average DC bus voltage of module of m (a, b or c) th phase
Figure BDA00022896504000000712
Error value of (2), i.e.
Figure BDA00022896504000000713
Using the error value as PI controller PIclusterAn input of the PI controller PIclusterThe output value of the (m) th phase average active power deviation value
Figure BDA00022896504000000714
The second step is that: calculating the actual value of the positive sequence component of the fundamental current of the HVAC port
Figure BDA00022896504000000715
And
Figure BDA00022896504000000716
electric network voltage fundamental wave negative sequence component measured value
Figure BDA00022896504000000717
And
Figure BDA00022896504000000718
average power component produced
Figure BDA00022896504000000719
The formula is as follows:
Figure BDA00022896504000000720
the third step: calculating an average active power reference vector generated by the HVAC port current fundamental wave negative sequence component and the grid voltage fundamental wave positive sequence component, wherein the formula is as follows:
Figure BDA0002289650400000081
the fourth step: according to the average active power reference vector
Figure BDA0002289650400000082
Calculating the fundamental negative-sequence current component to be injected according to the following formula
Figure BDA0002289650400000083
And
Figure BDA0002289650400000084
the current is the fundamental wave negative sequence current reference value in the current inner loop control.
Figure BDA0002289650400000085
(3) Reactive compensation control implementation method
The HVAC port reactive power compensation control block diagram is shown in figure 4.
The first step is as follows: according to the measured value of the negative sequence component of the port current fundamental wave
Figure BDA0002289650400000086
And
Figure BDA0002289650400000087
measured value of fundamental negative sequence component of power grid voltage
Figure BDA0002289650400000088
And
Figure BDA0002289650400000089
calculating the negative sequence reactive power component
Figure BDA00022896504000000810
The formula is as follows:
Figure BDA00022896504000000811
the second step is that: according to the reactive power set value
Figure BDA00022896504000000812
And negative sequence reactive power component
Figure BDA00022896504000000813
Calculating a positive sequence reactive power component reference value
Figure BDA00022896504000000814
Calculating the fundamental positive sequence reactive current component to be injected according to the following formula
Figure BDA00022896504000000815
The current is the fundamental wave positive sequence reactive current reference value in the current inner loop control.
Figure BDA00022896504000000816
(4) Current control and harmonic wave treatment implementation method
The control of the current is done under dq rotation coordinate system. The circuit is divided into a positive sequence current control loop and a negative sequence current control loop; the control of fundamental wave positive sequence current and higher harmonic current is realized in a positive sequence current control loop; and the control of the fundamental negative sequence current is realized in the negative sequence current control loop.
The positive sequence current control loop block diagram is shown in fig. 5.
The first step is as follows: a positive sequence current control loop reference value is calculated. For compensating the network-side load harmonic current i shown in FIG. 1lhLet the system current isDoes not contain higher harmonic current component, realizes the harmonic treatment function, and synthesizes vector i to HVAC port currentbh(fundamental positive sequence vector i)+And higher harmonic vector ithSum) of the values is controlled uniformly. Controlled to form a vector ibhThe reference values for the positive sequence d-axis and positive sequence q-axis components are:
Figure BDA0002289650400000091
the second step is that: calculating the error between the reference value and the measured value of the resultant vector, i.e.
Figure BDA0002289650400000092
And
Figure BDA0002289650400000093
using the error value as a positive sequence current controller
Figure BDA0002289650400000094
The input value of (1). Wherein the content of the first and second substances,
Figure BDA0002289650400000095
is a PI controller, and is used as a power supply,
Figure BDA0002289650400000096
is the sum of a plurality of Vector PI (VPI) controllers, namely:
Figure BDA0002289650400000097
the third step: controller for calculating positive sequence current
Figure BDA0002289650400000098
Output value of
Figure BDA0002289650400000099
Vector u synthesized with grid voltagesbh(fundamental positive sequence vector)
Figure BDA00022896504000000910
And higher harmonic vector
Figure BDA00022896504000000911
Sum) of positive sequence d-axis and positive sequence q-axis components
Figure BDA00022896504000000912
And (c) the sum, i.e.:
Figure BDA00022896504000000913
this value is the positive sequence reference value for the HVAC port bridge arm voltage.
The negative sequence current control loop block diagram is shown in fig. 6.
The first step is as follows: calculating the error between the reference value and the measured value of the negative sequence current, i.e.
Figure BDA00022896504000000914
And
Figure BDA00022896504000000915
using the error value as a negative sequence current controller
Figure BDA00022896504000000916
The input value of (1). Wherein the content of the first and second substances,
Figure BDA00022896504000000917
is a PI controller.
The third step: controller for calculating negative sequence current
Figure BDA00022896504000000918
Output value of
Figure BDA00022896504000000919
Measured value of grid voltage fundamental wave negative sequence vector
Figure BDA00022896504000000920
And (4) summing. Namely:
Figure BDA00022896504000000921
this value is the negative sequence reference value for the HVAC port leg voltage.
(5) PWM modulation and module voltage-sharing realization method
The overall implementation block diagram of the invention is shown in FIG. 7, the positive and negative sequence reference values of the HVAC port bridge arm voltage output by the current loop
Figure BDA00022896504000000922
And
Figure BDA00022896504000000923
the voltage reference value under the abc static coordinate system is synthesized through coordinate transformation, a carrier phase shifted sinusoidal pulse width modulation (CPS-SPWM) is adopted to generate driving pulses, voltage-sharing control is performed on module voltages in each phase of the CHB through a sequencing method, and the pulses are distributed to each module driving board to realize control on the bridge arm voltages of the modules.

Claims (5)

1. A method for realizing multifunctional form of a high-voltage alternating current HVAC port of an electric energy router EER based on decoupling control is characterized by comprising the following steps: based on the decoupling control of three-phase average active power and port current, the method simultaneously realizes the triple functional forms of active power following, reactive power compensation and harmonic wave treatment at the HVAC port of the EER, and comprises the following steps:
(1) the power outer loop control process: under the condition of unbalanced grid voltage or port active load, positive sequence and negative sequence decoupling is carried out on input instantaneous active power of an HVAC port, independent control of average active power of each phase is realized by injecting fundamental negative sequence current into the HVAC port according to the distribution rule of the decoupled average active power component in three phases a, b and c, stable control is carried out on total average active power of the three phases by injecting fundamental positive sequence current into the HVAC port, and reactive power compensation control is realized by considering negative sequence reactive component;
(2) the current inner loop control process: under a positive sequence dq rotating coordinate system, uniformly controlling a port current fundamental wave positive sequence component and a higher harmonic component to realize a harmonic treatment function; and under a negative sequence dq rotating coordinate system, controlling a port current fundamental wave negative sequence component.
2. The method for realizing the multifunctional form of the high-voltage alternating-current port HVAC of the EER based on the decoupling control of the electric energy router of claim 1, wherein the method for stably controlling the total average active power of the three phases in the power outer loop control process is to realize the balance between the total input average active power of the three phases of the HVAC port and the total active load of the three phases carried by the HVAC port by injecting a fundamental wave positive sequence current into the HVAC port, so as to control the three-phase average DC bus voltage of the HVAC port to be equal to the set reference voltage
Figure FDA0002289650390000011
And the method for performing stable control comprises the following steps:
the first step is as follows: calculating the reference voltage
Figure FDA0002289650390000012
And the measured value of the three-phase average DC bus voltage
Figure FDA0002289650390000013
Error value of (2), i.e.
Figure FDA0002289650390000014
Using the error value as PI controller PIudcAn input of the PI controller PIudcThe output value of (1) is the total average active power reference of three phases
Figure FDA0002289650390000015
The second step is that: according to the total average active power reference of the three phases
Figure FDA0002289650390000016
Calculating the fundamental positive sequence active current component to be injected according to the following formula
Figure FDA0002289650390000017
The current is the fundamental wave positive sequence active current reference value of the current inner loop controller,
Figure FDA0002289650390000018
wherein the content of the first and second substances,
Figure FDA0002289650390000019
the measured value of the positive sequence component of the fundamental wave of the power grid voltage is obtained.
3. The method for realizing the multifunctional form of the high-voltage alternating-current port HVAC based on the electric energy router EER with the decoupling control as claimed in claim 1, wherein in the power outer loop control process, the method for realizing the independent control of the average active power of each phase is to inject fundamental negative sequence current into the HVAC port to independently control the average active power of each phase of the HVAC port, so as to ensure that the three-phase direct-current bus voltages of the HVAC port are balanced with each other when the three-phase grid voltage is unbalanced or the active load carried by the HVAC port is unbalanced, and the method for realizing the independent control comprises the following steps:
the first step is as follows: calculating the reference voltage
Figure FDA0002289650390000021
Measured value of mean DC bus voltage of m-th phase module
Figure FDA0002289650390000022
Error value of (2), i.e.
Figure FDA0002289650390000023
Using the error value as PI controller PIclusterAn input of the PI controller PIclusterThe output value of the (m) th phase average active power deviation value
Figure FDA0002289650390000024
Wherein m is a, b or c;
the second step is that: calculating the actual value of the fundamental positive sequence component of the HVAC port current
Figure FDA0002289650390000025
And
Figure FDA0002289650390000026
electric network voltage fundamental wave negative sequence component measured value
Figure FDA0002289650390000027
And
Figure FDA0002289650390000028
average power component produced
Figure FDA0002289650390000029
The formula is as follows:
Figure FDA00022896503900000210
the third step: calculating an average active power reference vector generated by the HVAC port current fundamental wave negative sequence component and the grid voltage fundamental wave positive sequence component, wherein the formula is as follows:
Figure FDA00022896503900000211
the fourth step: according to the average active power reference vector
Figure FDA00022896503900000212
Calculating the fundamental negative-sequence current component to be injected according to the following formula
Figure FDA00022896503900000213
And
Figure FDA00022896503900000214
the current component is the fundamental negative-sequence current reference value in the current inner loop control,
Figure FDA00022896503900000215
4. the method for realizing the multifunctional form of the high-voltage alternating-current port HVAC of the EER based on the decoupling control electric energy router according to claim 1, wherein in the process of controlling the power outer loop, the method for realizing the reactive power compensation control comprises the following steps:
the first step is as follows: according to the measured value of the negative sequence component of the port current fundamental wave
Figure FDA0002289650390000031
And
Figure FDA0002289650390000032
negative sequence of fundamental wave of grid voltageMeasured value of component
Figure FDA0002289650390000033
And
Figure FDA0002289650390000034
calculating the negative sequence reactive power component
Figure FDA0002289650390000035
The formula is as follows:
Figure FDA0002289650390000036
the second step is that: according to the reactive power set value
Figure FDA0002289650390000037
And said negative sequence reactive power component
Figure FDA0002289650390000038
Calculating a positive sequence reactive power component reference value
Figure FDA0002289650390000039
The formula is as follows:
Figure FDA00022896503900000310
the third step: according to the formula
Figure FDA00022896503900000311
Calculating the fundamental positive sequence reactive current component to be injected
Figure FDA00022896503900000312
The current component
Figure FDA00022896503900000313
I.e. the base in the current inner loop controlWave positive sequence reactive current reference value.
5. The method for implementing the multifunctional form of the high-voltage alternating-current port HVAC of the EER based on the decoupling control power router as claimed in claim 1, wherein in the current inner loop control process, under a positive sequence dq rotation coordinate system, the method for implementing the harmonic suppression function comprises the following steps:
the first step is as follows: calculating a positive sequence current control loop reference value to compensate a network side load harmonic current vector ilhMake the system current vector isDoes not contain higher harmonic current component, realizes the harmonic treatment function, and synthesizes vector i to HVAC port currentbhPerforming unified control, the resultant vector ibhIs a fundamental positive sequence vector i+And higher harmonic vector ithSumming; controlled to form a vector ibhThe reference values for the positive sequence d-axis and positive sequence q-axis components are:
Figure FDA00022896503900000314
wherein the content of the first and second substances,
Figure FDA00022896503900000315
and
Figure FDA00022896503900000316
for net side load current ilHigher harmonic vector i oflhMeasured values of components at positive sequence d-axis and positive sequence q-axis;
the second step is that: calculating an error value between the reference value and the measured value of the composite vector, i.e.
Figure FDA00022896503900000317
And
Figure FDA00022896503900000318
using the error value as a positive sequence current controller
Figure FDA00022896503900000319
The input value of (a), wherein,
Figure FDA00022896503900000320
is a PI controller, and is used as a power supply,
Figure FDA00022896503900000321
as a sum of a plurality of vector PI controllers, i.e.
Figure FDA00022896503900000322
The third step: controller for calculating positive sequence current
Figure FDA00022896503900000323
Output value of
Figure FDA00022896503900000324
Vector u synthesized with grid voltagesbhMeasured values of positive sequence d-axis and positive sequence q-axis components
Figure FDA0002289650390000041
Sum of the above-mentioned composite vectors usbhIs the fundamental positive sequence vector
Figure FDA0002289650390000042
And higher harmonic vector
Figure FDA0002289650390000043
To sum, i.e.
Figure FDA0002289650390000044
Figure FDA0002289650390000045
This value is the positive sequence reference value for the HVAC port bridge arm voltage.
CN201911174686.5A 2019-11-26 2019-11-26 Decoupling control-based electric energy router high-voltage alternating-current port multifunctional form implementation method Expired - Fee Related CN111092446B (en)

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