CN111313412A - Method for analyzing influence of multi-access electric vehicle charging pile on power grid harmonic waves - Google Patents
Method for analyzing influence of multi-access electric vehicle charging pile on power grid harmonic waves Download PDFInfo
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
- B60L53/30—Constructional details of charging stations
- B60L53/31—Charging columns specially adapted for electric vehicles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
- B60L53/60—Monitoring or controlling charging stations
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
- B60L53/60—Monitoring or controlling charging stations
- B60L53/67—Controlling two or more charging stations
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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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/02—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from ac mains by converters
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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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
-
- 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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/10—Technologies relating to charging of electric vehicles
- Y02T90/12—Electric charging stations
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
Abstract
The invention relates to an analysis method for the influence of a multi-access electric vehicle charging pile on power grid harmonic waves, wherein equivalent modeling of the electric vehicle charging pile is carried out to obtain an electric vehicle charging pile equivalent model, and a nonlinear resistor is used for simulating an equivalent input resistor of a high-frequency power conversion link; curve fitting is carried out on the output power of the charger through a nonlinear resistor, equivalent modeling of a control circuit is carried out, and a control circuit equivalent model is obtained; and substituting the electric automobile charging pile equivalent model, the nonlinear resistance model and the control circuit equivalent model into a distributed power distribution network for simulation analysis. According to the invention, a PSCAD software simulation platform is utilized to establish a simulation model of the electric automobile charging pile and a simple distribution network model, and the electric automobile is accessed into a distribution network to be used for quantitatively analyzing harmonic wave interaction influence relations among the electric automobile charging piles and between the electric automobile charging pile and the distribution network, so that auxiliary decision support is provided for operation management and planning design of the electric automobile charging station.
Description
Technical Field
The invention belongs to the technical field of electrical engineering, and particularly relates to a method for analyzing the influence of a multi-access electric automobile charging pile on power grid harmonic waves.
Background
With the aggravation of energy crisis and environmental pollution, distributed power supplies and electric vehicles are rapidly developed in the global scope and are more and more valued by people. The electric automobile is driven by electric power instead of the traditional driving mode, on one hand, the emission of greenhouse gases can be reduced, and the environment is improved, on the other hand, an inverter is used for charging the electric automobile as a grid-connected and direct-alternating conversion interface, and the safe and stable operation of a power grid is influenced when the output harmonic content is too high, so that the electric automobile is an important harmonic source. And when many electric automobile fill electric pile simultaneous working, the influence that the interactive influence between the harmonic that its produced exists will be more complicated to the electric wire netting safety. In recent years, scholars at home and abroad model and analyze the harmonic problem generated by the electric automobile charging pile, but the current research does not relate to the influence of background harmonic on the harmonic generated by the electric automobile charging pile. The presence of background harmonics may cause the amplitude of each subharmonic generated by the charger to vary.
The invention provides a method for analyzing the influence of a multi-access electric vehicle charging pile on power grid harmonic waves, which is used for overcoming the defects.
Disclosure of Invention
The invention aims to provide a method for analyzing the influence of a multi-access electric vehicle charging pile on power grid harmonic waves, which is used for solving one of the technical problems in the prior art, such as: in recent years, scholars at home and abroad model electric vehicle charging piles and analyze the harmonic problem generated by the electric vehicle charging piles, but the current research does not relate to the influence of background harmonic on the harmonic generated by the electric vehicle charging piles; the presence of background harmonics may cause the amplitude of the harmonics generated by the charger to vary.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a method for analyzing the influence of a multi-access electric vehicle charging pile on power grid harmonic waves comprises the following steps:
s1: on the basis of basic electrical configuration of the electric automobile charging pile, equivalent modeling of the electric automobile charging pile is carried out to obtain an electric automobile charging pile equivalent model, and a nonlinear resistor R is usedcSimulating an equivalent input resistance of a high-frequency power conversion link;
s2: in the equivalent model of the electric vehicle charging pile in the step S1, a nonlinear resistor R is usedcOutput power P of charger is fitted with curve0(t), carrying out nonlinear resistance modeling to obtain a nonlinear resistance model;
s3: performing equivalent modeling on a control circuit on the basis of a basic control circuit of the electric automobile charging pile to obtain a control circuit equivalent model;
s4: and substituting the electric automobile charging pile equivalent model, the nonlinear resistance model and the control circuit equivalent model into a distributed power supply distribution network for simulation analysis.
Further, the equivalent modeling of the electric vehicle charging pile in the step S1 specifically includes:
the method comprises the following steps of dividing an electric automobile charging pile into an inverter module, a DC/DC power converter module and a filtering module which are connected in sequence; the inverter module receives and inverts alternating current from the power distribution network into direct current, then power conversion is carried out through the DC/DC power converter module, and the alternating current is filtered through the filtering module and then output to the electric automobile for power supply;
the charging method of the electric automobile is characterized in that the output current I of the charging pile is within a certain number of power frequency periodsoAnd an output voltage UoIs constant in the low frequency range, using a non-linear resistor RcThe equivalent input resistance of a high-frequency power conversion link is simulated:
(1) in the formula:
Udc——DC/DC power conversion circuit input voltage;
Idc-DC/DC power conversion circuit input current;
Uo-the DC/DC power conversion circuit output voltage;
Io-the DC/DC power conversion circuit outputs a current;
Po-the DC/DC power conversion circuit output power;
η -DC/DC Power conversion Circuit efficiency.
Further, the modeling of the nonlinear resistance in step S2 is specifically:
represented by formula (1), a non-linear resistance RcIt is the change in whole charging cycle, according to filling electric pile charging process record data, fills electric pile output's curve with curve fitting:
(2) in the formula P0maxIs the maximum output power in kW, and t is the charging duration.
Further, the equivalent modeling of the control circuit in step S3 is specifically:
selecting a PI control strategy under a synchronous rotating coordinate system by taking a controller of the synchronous rotating coordinate system as a reference; the control process is shown as formula (3):
LΣis the equivalent inductance of the filter;
ifdifqis ifaifbifcD-axis and q-axis components after park transformation;
uduqis uoauobuocD-axis and q-axis components after park transformation;
u1du1qis uaubucD-axis and q-axis components after park transformation;
for three-phase instantaneous value current ifaifbifcWith three-phase instantaneous voltage uoauobuocAfter park transformation, a dq axis component i is obtainedfdifqAnd uduq(ii) a Will direct current voltage UdcWith a given reference signal
Comparing, and performing PI control on the error to obtain a reference signal of the inner loop controller
When the direct current input voltage is not equal to the reference value, the error signal is not zero, so that the PI regulator carries out error-free tracking regulation until the error signal is zero;
in the inner loop control link, three-phase instantaneous current ifaifbifcIs transformed into dq component after park transformation, and is output as a reference signal by an outer loop controller
And
and comparing, performing PI control on the error, and performing voltage feedforward compensation and cross-coupling compensation according to an equation (3).
Compared with the prior art, the invention has the beneficial effects that: the invention provides an analysis method for the influence of electric vehicle charging piles on power distribution network harmonic waves during operation by combining the characteristics of background harmonic waves of the power distribution network and the characteristics of mutual influence of harmonic waves of different charging stations. The PSCAD software simulation platform is used for establishing a simulation model of the electric automobile charging pile and a simple power distribution network model, and the electric automobile is connected into a power distribution network and used for quantitatively analyzing harmonic wave interaction influence relations between the electric automobile charging piles and between the electric automobile charging pile and the power distribution network, so that auxiliary decision support is provided for operation management and planning design of the electric automobile charging pile.
Drawings
Fig. 1 is a schematic structural diagram of an electric vehicle charging pile according to an embodiment of the invention.
Fig. 2 is a schematic diagram of an electric vehicle charging pile simulation model according to an embodiment of the invention.
FIG. 3 is a non-linear resistance control schematic of an embodiment of the present invention.
Fig. 4 is a schematic diagram of a charging power variation of the electric vehicle according to the embodiment of the invention.
Fig. 5 is a schematic control diagram of a PWM rectifier under dq coordinate system according to an embodiment of the present invention.
FIG. 6 is a schematic diagram of a simulation topology of an embodiment of the present invention.
Fig. 7 is a schematic diagram of a simulation result of harmonic current at a grid-connected point when charging piles of electric vehicles with different numbers are connected in the embodiment of the invention.
Fig. 8 is a schematic diagram of a simulation result of harmonic currents at an access point when charging piles of electric vehicles with different numbers are connected according to an embodiment of the present invention.
Fig. 9 is a schematic diagram of harmonic current output characteristics of an electric vehicle charging pile in consideration of background harmonics according to an embodiment of the present invention.
FIG. 10 is a flow chart illustrating the steps of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to fig. 1 to 10 of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example (b):
(1) equivalent modeling of electric vehicle charger
The electric vehicle charging pile mainly comprises an inverter module, a DC/DC power converter module and a filtering module. The alternating current from the power distribution network is received, and the electric energy is provided for the electric automobile after a series of links. The topology is shown in figure 1. For convenience of useSimulation, the power converter part in fig. 1 can be made equivalent, and the equivalent result is shown in fig. 2. The most common charging method for electric vehicles is constant current voltage limiting/constant voltage current limiting, and within a certain number of power frequency cycles, the output current and output voltage of the charger can be regarded as constant direct currents, i.e. U in fig. 1o、IoAre all constants. In the low frequency range, a non-linear resistor R can be usedcThe equivalent input resistance of a high-frequency power conversion link is approximately simulated:
the overall equivalent result graph is shown in fig. 1-2. In the formula:
Udc(Idc) -DC/DC power conversion circuit input voltage (current);
Uo(Io) -DC/DC power conversion circuit output voltage (current);
Po-the DC/DC power conversion circuit output power;
η -DC/DC Power conversion Circuit efficiency;
2) nonlinear resistance modeling
Represented by formula (1), a non-linear resistance RcThe curve is changed in the whole charging period, and according to the data recorded in the charging process of the storage battery, the curve of the output power of the charger is fitted by a curve:
wherein P is0maxIs the maximum output power in kW. The output power curve is shown in fig. 4. Constructing R according to formula (1) and formula (2) by using a component library in PSCADcAnd P0Fig. 3, wherein, the maximum power of a single charger is assumed to be 0.009MW, and the efficiency η is assumed to be 0.9, the control block diagram is shown in fig. 3.
3) Control circuit modeling
For the design of the control circuit of the electric automobile, the PI control strategy under the synchronous rotating coordinate system is selected herein because the controller of the synchronous rotating coordinate system is convenient to design, the PI parameter setting is easy, and the decoupling characteristic is provided. The control block diagram is shown in fig. 5, and the control equation is shown in formula (3):
LΣis the equivalent inductance of the filter;
ifdifqis ifaifbifcD-axis and q-axis components after park transformation;
uduqis uoauobuocD-axis and q-axis components after park transformation;
u1du1qis uaubucD-axis and q-axis components after park transformation;
for three-phase instantaneous value current ifaifbifcWith three-phase instantaneous voltage uoauobuocAfter park transformation, a dq axis component i is obtainedfdifqAnd uduq. Will direct current voltage UdcWith a given reference signal
Comparing, and performing PI control on the error to obtain a reference signal of the inner loop controller
When the direct current input voltage is not equal to the reference value, the error signal is not zero, so that the PI regulator carries out error-free tracking regulation until the error signal is zero.
In the inner loop control link, three-phase instantaneous current ifaifbifcIs transformed into dq component after park transformation, and is output as a reference signal by an outer loop controller
And
and comparing, performing PI control on the error, and performing voltage feedforward compensation and cross-coupling compensation according to an equation (3).
4) System modeling and simulation analysis
In order to verify the correctness of the provided conclusion, the invention builds a power distribution network simulation model accessed to the multi-electric vehicle charging pile and other distributed power supplies. Meanwhile, in order to reflect the actual working conditions more accurately, other distributed power sources are added to the model besides the photovoltaic power generation system, and the overall structure diagram is shown in fig. 6. Since the distributed power supply generally adopts power electronics to realize electric energy conversion and is connected to a power grid, the most common distributed power supply is a three-phase voltage type SPWM inverter. Therefore, the distributed power supplies except the photovoltaic power generation system are simply and equivalently performed by using the three-phase voltage type SPWM inverter. The figure has four electric automobile charging pile access points in total. The point-of-presence and access point are shown. The main parameters are shown in table 1.
TABLE 1
Harmonic influence of analysis of multi-electric automobile charging pile access system
In order to explore the change situation that the harmonic influence of an electric automobile charging pile on a power grid increases along with the number of electric automobiles, the harmonic situation of an access point and a grid-connected point when the number of electric automobile charging piles connected to a power distribution network is 1, 2, 3 and 4 is simulated respectively. The simulation results are shown in fig. 7 and 8. Wherein different colors represent different access station numbers, and the types of charging piles for accessing the electric automobile are the same.
It can be found from fig. 7 that, as the number of the electric vehicle charging piles increases, the amplitude of the harmonic current output by a single electric vehicle charging pile (access point) tends to decrease. The reasons for this phenomenon are: the superposition of harmonics is the superposition of vectors, the superposition result is influenced by the phase, and harmonic currents mutually assist in subtraction.
As can be seen from fig. 8, as the number of charging piles connected to the electric vehicle increases, the amplitude of the harmonic current on the collection bus (access point) tends to increase significantly. The reasons for this phenomenon are: after the electric automobile charging pile is connected to a power distribution network, the transmitted harmonic current is greatly influenced by impedance between an access point and a system, and the impedance between the access point and the system is far smaller than the impedance between the access point, so most of the harmonic current generated by the work of the electric automobile charging pile flows to the system. Besides, it can be found that the 5 th harmonic current generated by putting 1 charger into the system is 0.441A, and the 5 th harmonic current generated by putting 4 chargers into the same system is 0.938A. From the above data, it can be found that the harmonic current generated by the 4 electric vehicle charging piles is not 4 times but 2.1 times that of the 1 electric vehicle charging pile. This is because there is the effect that the harmonic is mutually offset between the electric automobile charging pile of access system, leads to the harmonic not to multiply with the increase of equipment number and increases.
Influence of system background harmonic waves on multi-charging-pile access is considered
Fig. 9 shows a simulation comparison result of harmonic current output (grid-connected point) of a single electric vehicle charging pile under the condition of the presence or absence of background harmonic when two electric vehicle charging piles are connected. The power grid background harmonic voltage is assumed to only contain low-frequency harmonics (fundamental waves, 3, 5 and 7 times), the amplitudes of the harmonic voltages are 327V, 150V, 100V and 50V respectively, and the phase angles are all 0. It can be seen that, under the condition of considering the background harmonic wave, the harmonic wave emission level of a single electric automobile charging pile is higher than that when the background harmonic wave is not considered. When the background harmonic voltage exists, the frequency of the harmonic current additionally generated by the electric automobile charging pile is the same as the background harmonic voltage, and the amplitude is in direct proportion to the amplitude of the background harmonic voltage. Therefore, the harmonic current output by the charging pile of the electric automobile is obviously increased.
The above are preferred embodiments of the present invention, and all changes made according to the technical scheme of the present invention that produce functional effects do not exceed the scope of the technical scheme of the present invention belong to the protection scope of the present invention.
Claims (4)
1. The method for analyzing the influence of the multi-access electric vehicle charging pile on the power grid harmonic waves is characterized by comprising the following steps of:
s1: on the basis of basic electrical configuration of the electric automobile charging pile, equivalent modeling of the electric automobile charging pile is carried out to obtain an electric automobile charging pile equivalent model, and a nonlinear resistor R is usedcSimulating an equivalent input resistance of a high-frequency power conversion link;
s2: in the equivalent model of the electric vehicle charging pile in the step S1, a nonlinear resistor R is usedcOutput power P of charger by curve fitting0(t), carrying out nonlinear resistance modeling to obtain a nonlinear resistance model;
s3: performing equivalent modeling on a control circuit on the basis of a basic control circuit of the electric automobile charging pile to obtain a control circuit equivalent model;
s4: and substituting the electric automobile charging pile equivalent model, the nonlinear resistance model and the control circuit equivalent model into a distributed power distribution network for simulation analysis.
2. The method for analyzing the influence of the multi-access electric vehicle charging pile on the power grid harmonic waves as claimed in claim 1, wherein the electric vehicle charging pile equivalent modeling in the step S1 specifically comprises the following steps:
the method comprises the following steps of dividing an electric automobile charging pile into an inverter module, a DC/DC power converter module and a filtering module which are connected in sequence; the inverter module receives and inverts alternating current from the power distribution network into direct current, then power conversion is carried out through the DC/DC power converter module, and the alternating current is filtered through the filtering module and then output to the electric automobile for power supply;
the charging method of the electric automobile is characterized in that the output current I of the charging pile is within a certain number of power frequency periodsoAnd an output voltage UoIs constant in the low frequency range, using a non-linear resistor RcThe equivalent input resistance of a high-frequency power conversion link is simulated:
(1) in the formula:
Udc-DC/DC power conversion circuit input voltage;
Idc-DC/DC power conversion circuit input current;
Uo-the DC/DC power conversion circuit output voltage;
Io-the DC/DC power conversion circuit outputs a current;
Po-the DC/DC power conversion circuit output power;
η -DC/DC Power conversion Circuit efficiency.
3. The method for analyzing the influence of the multi-access electric vehicle charging pile on the power grid harmonic waves as claimed in claim 2, wherein the nonlinear resistance modeling in the step S2 is specifically as follows:
represented by formula (1), a non-linear resistance RcIt is the change in whole charging cycle, according to filling electric pile charging process record data, fills electric pile output's curve with curve fitting:
(2) in the formula P0maxIs the maximum output power in kW, and t is the charging duration.
4. The method for analyzing the influence of the multi-access electric vehicle charging pile on the power grid harmonic waves is characterized in that the control circuit equivalent modeling in the step S3 is specifically as follows:
selecting a PI control strategy under a synchronous rotating coordinate system by taking a controller of the synchronous rotating coordinate system as a reference; the control equation is shown in equation (3):
LΣis the equivalent inductance of the filter;
ifdifqis ifaifbifcD-axis and q-axis components after park transformation;
uduqis uoauobuocD-axis and q-axis components after park transformation;
u1du1qis uaubucD-axis and q-axis components after park transformation;
for three-phase instantaneous value current ifaifbifcWith three-phase instantaneous voltage uoauobuocAfter park transformation, a dq axis component i is obtainedfdifqAnd uduq(ii) a Will direct current voltage UdcWith a given reference signal
Comparing, and performing PI control on the error to obtain a reference signal of the inner loop controller
When the direct current input voltage is not equal to the reference value, the error signal is not zero, so that the PI regulator carries out error-free tracking regulation until the error signal is zero;
in the inner loop control link, three-phase instantaneous current ifaifbifcIs transformed into dq component after park transformation, and is output as a reference signal by an outer loop controller
And
and comparing, performing PI control on the error, and performing voltage feedforward compensation and cross-coupling compensation according to an equation (3).
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| CN106712089A (en) * | 2017-01-20 | 2017-05-24 | 东南大学 | Multifunctional distributed power supply grid-connection device based on nine-switch-tube inverter |
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| CN108667036A (en) * | 2017-03-28 | 2018-10-16 | 国家电网公司 | A kind of electric vehicle V2G inverter control methods |
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| CN109800520A (en) * | 2019-01-25 | 2019-05-24 | 国网浙江省电力有限公司湖州供电公司 | A kind of electric automobile charging station Harmonic Modeling method neural network based |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106712089A (en) * | 2017-01-20 | 2017-05-24 | 东南大学 | Multifunctional distributed power supply grid-connection device based on nine-switch-tube inverter |
| CN108667036A (en) * | 2017-03-28 | 2018-10-16 | 国家电网公司 | A kind of electric vehicle V2G inverter control methods |
| CN108599191A (en) * | 2018-03-06 | 2018-09-28 | 东南大学 | A kind of electric power spring power decoupling control method of belt current inner ring |
| CN109444505A (en) * | 2018-05-03 | 2019-03-08 | 国网江苏省电力公司盐城供电公司 | A kind of electric automobile charging station harmonic current detection based on variation Bayes's parametric learning method |
| CN109800520A (en) * | 2019-01-25 | 2019-05-24 | 国网浙江省电力有限公司湖州供电公司 | A kind of electric automobile charging station Harmonic Modeling method neural network based |
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