CN117394358A - Multi-port flexible converter device and electric energy quality control method - Google Patents
Multi-port flexible converter device and electric energy quality control method Download PDFInfo
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- CN117394358A CN117394358A CN202311576012.4A CN202311576012A CN117394358A CN 117394358 A CN117394358 A CN 117394358A CN 202311576012 A CN202311576012 A CN 202311576012A CN 117394358 A CN117394358 A CN 117394358A
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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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- 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
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
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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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
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Abstract
The invention relates to the technical field of new energy power quality regulation, in particular to a multiport flexible converter device and a power quality control method, wherein a first voltage waveform data set and a first current waveform data set are firstly obtained; then determining the effective voltage value, current phase and three-phase unbalance of the main power supply according to the first voltage waveform data set and the first current waveform data set; and finally, according to the voltage effective value, the current phase, the three-phase unbalance degree and the residual capacity of the multi-port flexible current transformer, adjusting the three-phase grid-connected current and the three-phase grid-connected current phase of the multi-port flexible current transformer so that the output of the main power supply simultaneously meets the voltage requirement, the power factor requirement and the three-phase unbalance requirement. The embodiment of the invention gives consideration to the power factor and the voltage range, so that the improvement effect is good and the operation is more reliable.
Description
Technical Field
The invention relates to the technical field of new energy power quality regulation, in particular to a multi-port flexible converter device and a power quality control method.
Background
With the higher and higher permeability of distributed resources such as electric vehicles and photovoltaics, the probability output of the distributed resources aggravates the voltage fluctuation of nodes, and the problems of power grid harmonic wave, voltage out-of-limit and imbalance of three-phase voltage are increasingly outstanding.
In the prior art, the electric energy treatment equipment has single function, and particularly three-phase unbalance treatment is often carried out by a method of load commutation or reactive power compensation and the like, wherein the frequent operation of the load commutation has higher switching requirements on a commutation device and the risk of load outage exists.
The existing reactive power compensation device and the like cannot deal with the problems of capacitive reactive power, harmonic waves, voltage out-of-limit and new energy consumption existing in nonlinear power electronic loads. And the method is not applicable to distribution lines with increasingly complex and higher requirements on the power quality.
Based on the above, a flexible converter device and a power quality control method need to be developed and designed.
Disclosure of Invention
The embodiment of the invention provides a multi-port flexible converter device and an electric energy quality control method, which are used for solving the problem that a plurality of devices are needed to control different electric energy quality problems for a new energy power generation system in the prior art.
In a first aspect, embodiments of the present invention provide a multi-port flexible current transformer device, including: a switching unit and a current converting unit;
The switch unit comprises a first switch, a second switch, a third switch, a fourth switch and a first electronic switch element; the first end of the first switch is electrically connected with the first end of the second switch and the second end of the fourth switch, two ends of the first electronic switch are respectively electrically connected with the second end of the second switch and the first end of the fourth switch, and the first electronic switch is connected with the third switch in parallel;
the current transformation unit comprises a first current transformer and a second current transformer, and the second end of the first current transformer and the second end of the second current transformer are electrically connected with the first end of the fourth switch;
when the first end of the first converter and the first end of the second converter are respectively connected with a distributed power supply and energy storage equipment, the output power of the first converter and the output power of the second converter are adjusted to finish the adjustment of the output power quality of the second end of the fourth switch.
In one possible implementation manner, the current transformation unit further includes: an isolation transformer, a fifth switch, a sixth switch and a seventh switch;
the first end of the isolation transformer is electrically connected with the first end of the fourth switch, the second end of the isolation transformer is electrically connected with the first end of the fifth switch, and the second end of the fifth switch is electrically connected with the second end of the sixth switch and the first end of the seventh switch respectively;
The first current transformer and the second current transformer respectively comprise: and the rectifying end of the first converter and the rectifying end of the second converter are respectively and electrically connected with the first end of the sixth switch and the second end of the seventh switch.
In a second aspect, an embodiment of the present invention provides a method for managing power quality, which is applied to the multi-port flexible current transformer device according to the first aspect or any one of the possible implementation manners of the first aspect, and the method for managing power quality includes:
acquiring a first voltage waveform data set and a first current waveform data set, wherein the first voltage waveform data set and the first current waveform data set are respectively obtained based on voltage and current output by a main power supply;
determining a voltage effective value, a current phase and three-phase unbalance of a main power supply according to the first voltage waveform data set and the first current waveform data set;
and according to the voltage effective value, the current phase, the three-phase unbalance degree and the residual capacity of the multi-port flexible current transformer, adjusting the three-phase grid-connected current and the three-phase grid-connected current phase of the multi-port flexible current transformer so that the output of the main power supply simultaneously meets the voltage requirement, the power factor requirement and the three-phase unbalance requirement.
In one possible implementation manner, the determining the voltage effective value, the current phase and the three-phase imbalance of the main power supply according to the first voltage waveform data set and the first current waveform data set includes:
determining a period of voltage from the first voltage waveform dataset;
according to the period, respectively acquiring a plurality of data from the first voltage waveform data set and the first current waveform data set, and constructing a second voltage waveform data set and a second current waveform data set, wherein the second voltage waveform data set and the second current waveform data set respectively correspond to a first period and a second period, the duration of the first period and the duration of the second period are the same and are integer multiples of the period duration, and the second period leads to one quarter of the period duration of the first period;
determining the voltage effective value and the current effective value according to the second voltage waveform data set and the second current waveform data set respectively;
and processing the second voltage waveform data set and the second current waveform data set in a mode of multiplying the data sets and summing the data sets to obtain the current phase, and determining the three-phase unbalance according to the current phase and the voltage effective value.
In one possible implementation manner, the processing the second voltage waveform data set and the second current waveform data set by means of data set multiplication and data set summation to obtain the current phase, and determining the three-phase imbalance according to the current phase and the voltage effective value includes:
respectively extracting data from the second voltage waveform data set and the second current waveform data set to construct three phase voltage waveform data sets and three phase current waveform data sets, wherein the three phase voltage waveform data sets and the three phase current waveform data sets respectively correspond to three phases of a main power supply;
respectively carrying out normalization processing on the three phase voltage waveform data sets and the three phase current waveform data sets to obtain three third voltage waveform data sets and three third current waveform data sets;
determining three current phases according to a first formula, the three third voltage waveform data sets and the three third current waveform data sets, wherein the three current phases correspond to three phases of a main power supply, and the first formula is as follows:
wherein alpha is pn Current phase being the pn-th phase, U pn (dn) is the dn data of the third voltage waveform data set corresponding to the pn-th phase, I pn (dN) is the dN data of the third voltage waveform dataset corresponding to the pn-th phase, dN is the total number of data in the third voltage waveform dataset;
determining the active power and the reactive power of the three phases according to the voltage effective values of the three phases, the current effective values of the three phases and the three current phases;
and determining the three-phase unbalance according to the active power and the reactive power of the three phases.
In one possible implementation manner, the adjusting the three-phase grid-connected current and the three-phase grid-connected current phase of the multi-port flexible current transformer according to the voltage effective value, the current phase, the three-phase unbalance degree and the residual capacity of the multi-port flexible current transformer so that the output of the main power supply meets the voltage requirement, the power factor requirement and the three-phase unbalance requirement simultaneously includes:
acquiring a power factor range, a voltage range, the residual capacity of the multi-port flexible converter device and a grid-connected instruction, wherein the multi-port flexible converter device outputs active power to a main power supply side according to the grid-connected instruction;
Sequencing three phases of a main power supply to obtain a first phase, a second phase and a third phase, wherein the first phase is the phase with the highest voltage effective value, and the third phase is the phase with the lowest voltage effective value;
the first phase reduces the first active current disturbance quantity, and when the power factor of the first phase is higher than the lower limit of the power factor range and the current phase is negative, the first phase increases the first current phase disturbance quantity, and when the power factor of the first phase is lower than the upper limit of the power factor range and the current phase is positive, the first phase decreases the first current phase disturbance quantity;
the third phase increases a third active current disturbance quantity, and when the power factor of the third phase is lower than the upper limit of the power factor range and the current phase is negative, the third phase decreases the third current phase disturbance quantity, and when the power factor of the third phase is higher than the lower limit of the power factor range and the current phase is positive, the third phase increases the third current phase disturbance quantity;
and the second active current disturbance quantity is overlapped with the second active current disturbance quantity, and the current phase disturbance quantity of the second phase is increased or reduced within the allowable range of the residual capacity of the multi-port flexible converter device so as to enable the voltage of the second phase to be stabilized within the voltage range, wherein the second active current disturbance quantity is determined according to the difference value between the grid-connected indication and the active power of the first phase and the active power of the third phase.
In one possible implementation manner, the increasing or decreasing the current phase disturbance amount of the second phase within the range allowed by the residual capacity of the multi-port flexible current transformer device so as to make the voltage of the second phase stable within the voltage range includes:
if the second active current disturbance quantity is positive, increasing the second current phase disturbance quantity by the second phase when the difference between the voltage effective value of the second phase and the voltage range is positive, the power factor of the second phase is higher than the lower limit of the power factor range and the current phase is negative, and decreasing the second current phase disturbance quantity when the difference between the voltage effective value of the second phase and the voltage range is positive, the power factor of the second phase is lower than the upper limit of the power factor range and the current phase is positive;
and if the second active current disturbance quantity is a negative value, the second phase reduces the second current phase disturbance quantity when the difference between the voltage effective value of the second phase and the voltage range is a negative value, the power factor of the second phase is higher than the lower limit of the power factor range and the current phase is a negative value, and the second phase increases the second current phase disturbance quantity when the difference between the voltage effective value of the second phase and the voltage range is a negative value, the power factor of the second phase is lower than the upper limit of the power factor range and the current phase is a positive value.
In a third aspect, an embodiment of the present invention provides an electric energy quality management device for implementing the electric energy quality management method according to the second aspect or any one of the possible implementation manners of the second aspect, where the electric energy quality management device includes:
the waveform data acquisition module is used for acquiring a first voltage waveform data set and a first current waveform data set, wherein the first voltage waveform data set and the first current waveform data set are respectively obtained based on the voltage and the current output by the main power supply;
the waveform analysis module is used for determining the voltage effective value, the current phase and the three-phase unbalance of the main power supply according to the first voltage waveform data set and the first current waveform data set;
and
And the electric energy quality management module is used for adjusting the three-phase grid-connected current and the three-phase grid-connected current phase of the multi-port flexible current transformer according to the voltage effective value, the current phase, the three-phase unbalance degree and the residual capacity of the multi-port flexible current transformer so that the output of the main power supply can meet the voltage requirement, the power factor requirement and the three-phase unbalance requirement simultaneously.
In a fourth aspect, embodiments of the present invention provide an electronic device comprising a memory and a processor, the memory having stored therein a computer program executable on the processor, the processor implementing the steps of the method according to the above second aspect or any one of the possible implementations of the second aspect when the computer program is executed.
In a fifth aspect, embodiments of the present invention provide a computer readable storage medium storing a computer program which, when executed by a processor, implements the steps of the method as described above in the second aspect or any one of the possible implementations of the second aspect.
Compared with the prior art, the embodiment of the invention has the beneficial effects that:
the embodiment of the invention discloses a power quality management method, which comprises the steps of firstly acquiring a first voltage waveform data set and a first current waveform data set, wherein the first voltage waveform data set and the first current waveform data set are respectively obtained based on voltage and current output by a main power supply; then determining the effective voltage value, current phase and three-phase unbalance of the main power supply according to the first voltage waveform data set and the first current waveform data set; and finally, according to the voltage effective value, the current phase, the three-phase unbalance degree and the residual capacity of the multi-port flexible current transformer, adjusting the three-phase grid-connected current and the three-phase grid-connected current phase of the multi-port flexible current transformer so that the output of the main power supply simultaneously meets the voltage requirement, the power factor requirement and the three-phase unbalance requirement. The embodiment of the invention adjusts the voltage effective value based on the voltage effective value, the current phase, the three-phase unbalance degree and the residual capacity of the multi-port flexible converter device, so that the voltage at one side of the lower voltage in the three-phase unbalance is raised, the voltage at the other side of the higher voltage is lowered, and the power factor and the voltage range are considered, so that the improvement effect is good and the operation is more reliable.
The embodiment of the invention realizes the adjustment of three-phase voltage balance based on the adjustment of active power and reactive power, ensures that the output can be according to the system indication requirement, fully utilizes the residual capacity, has less equipment investment and higher resource utilization.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Figure 1 is a schematic block diagram of a multi-port flexible current transformer provided by an embodiment of the present invention;
figure 2 is a schematic diagram of a current transforming unit provided by an embodiment of the present invention;
FIG. 3 is a flow chart of a power quality management method according to an embodiment of the present invention;
FIG. 4 is a functional block diagram of a power quality management apparatus according to an embodiment of the present invention;
fig. 5 is a functional block diagram of an electronic device according to an embodiment of the present invention.
In the figure:
a main power supply 101;
a first switch 102;
a second switch 103;
A third switch 104;
a fourth switch 105;
a first electronic switching element 106;
a fifth switch 202;
a sixth switch 203;
a seventh switch 204;
a first current transformer 205;
a second current transformer 206;
a distributed power supply 207;
an energy storage device 208;
and a current transforming unit 200.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth such as the particular system architecture, techniques, etc., in order to provide a thorough understanding of the embodiments of the present invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the following description will be made with reference to the accompanying drawings.
The following describes in detail the embodiments of the present invention, and the present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation procedure are given, but the protection scope of the present invention is not limited to the following embodiments.
Fig. 1 and fig. 2 are a schematic block diagram and a schematic diagram of a current transforming unit of a multi-port flexible current transforming device according to an embodiment of the present invention.
As shown in fig. 1, a schematic diagram of a multi-port flexible current transformer according to an embodiment of the present invention is shown, and the details are as follows:
the embodiment of the invention provides a multi-port flexible converter device, which comprises: a switching unit and a current converting unit 200;
the switching unit includes a first switch 102, a second switch 103, a third switch 104, a fourth switch 105, and a first electronic switching element 106; a first end of the first switch 102 is electrically connected with a first end of the second switch 103 and a second end of the fourth switch 105, two ends of the first electronic switch are respectively electrically connected with the second end of the second switch 103 and the first end of the fourth switch 105, and the first electronic switch is connected in parallel with the third switch 104;
the current transforming unit 200 includes a first current transformer 205 and a second current transformer 206, where a second end of the first current transformer 205 and a second end of the second current transformer 206 are electrically connected to a first end of the fourth switch 105;
when the first end of the first current transformer 205 and the first end of the second current transformer 206 are connected to the distributed power supply 207 and the energy storage device respectively, the output power of the second end of the fourth switch 105 is adjusted by adjusting the output power of the first current transformer 205 and the output power of the second current transformer 206.
In one possible implementation, the current transforming unit 200 further includes: an isolation transformer, a fifth switch 202, a sixth switch 203, and a seventh switch 204;
the first end of the isolation transformer is electrically connected to the first end of the fourth switch 105, the second end of the isolation transformer is electrically connected to the first end of the fifth switch 202, and the second end of the fifth switch 202 is electrically connected to the second end of the sixth switch 203 and the first end of the seventh switch 204, respectively;
the first current transformer 205 and the second current transformer 206 each include: the rectifying terminal of the first converter 205 and the rectifying terminal of the second converter 206 are electrically connected to the first terminal of the sixth switch 203 and the second terminal of the seventh switch 204, respectively.
Illustratively, as shown in fig. 1, the multi-port flexible current transforming device includes a switching unit and a current transforming unit 200, where the current transforming unit 200 includes at least two current transformers, which may be respectively connected to a distributed power station (e.g., a photovoltaic panel) and an energy storage device 208 (e.g., a battery), and the two current transformers may be combined to form multiple operation modes and supply power to a load together with the main power supply 101. For example, typical modes of operation include: when the output power of the distributed power station is low, the output electric energy of the distributed power station is connected with the main power supply 101 for generating power in a grid-connected mode; when the capacity of the distributed power station is high, the distributed power station is connected with the main power supply 101 to generate power, and part of the capacity is stored in the energy storage device 208; during peak power consumption, the distributed power station and the energy storage device 208 respectively output electric energy to be connected with the main power supply 101 for power generation; during the low power consumption, the surplus capacity of the main power source 101 is stored in the energy storage device 208.
In the process, the two converters can realize the input and output of electric energy, can detect and analyze the harmonic wave and voltage conditions existing in the system in real time, control the power unit, can use the residual capacity of the equipment for compensating unbalance, harmonic wave management and reactive power regulation of the system while finishing the photovoltaic power generation/energy storage function, can fully improve the utilization rate of the device, can use full capacity for three-phase unbalance correction when charging and discharging and night photovoltaic non-output are not needed, realize comprehensive treatment of the electric energy quality problems such as three-phase unbalance, harmonic wave and the like of the distribution network station area containing distributed photovoltaic/energy storage access, and solve the problems of untimely and inaccurate three-phase unbalance regulation of the distribution network station area containing the distributed photovoltaic/energy storage access.
For example, when the voltage of the main power supply 101 is low, the first switch 102 and the third switch 104 are opened, the second switch 103 and the fourth switch 105 are closed, the first electronic switch is controlled to be turned on, and the output is increased through the two converters so as to compensate the voltage; and when the main power supply 101 voltage drops further and falls below the threshold, the load may be powered by both converters by turning off the first electronic switch.
As shown in fig. 2, in addition to two converters, an isolation transformer for grid-connected isolation and a change-over switch are provided inside the converter unit 200. When the photovoltaic panel has more output and smaller load, the fifth switch 202 can be opened, the sixth switch 203 and the seventh switch 204 can be closed, and the photovoltaic output can be stored in the energy storage device 208; when the energy storage device 208 is connected to the main power supply 101 to supply power, the sixth switch 203 may be opened, and the fifth switch 202 and the seventh switch 204 may be closed, so as to realize grid-connected power generation of the energy storage device 208.
In addition, the two converters can utilize the residual capacity, and the output of the main power supply 101 meets the requirements of voltage, power factor and three-phase unbalance by adjusting the grid-connected current and the grid-connected current phase so as to solve the problem of power quality and improve the power quality.
The second aspect of the embodiments of the present invention deals with the management of the power quality problem by using the remaining capacity in detail.
Fig. 3 is a flowchart of a power quality management method according to an embodiment of the present invention.
As shown in fig. 3, a flowchart of an implementation of the power quality management method according to the embodiment of the present invention is shown, and the details are as follows:
In step 301, a first voltage waveform dataset and a first current waveform dataset are obtained, wherein the first voltage waveform dataset and the first current waveform dataset are obtained based on a voltage and a current output by a main power supply, respectively.
In step 302, a voltage effective value, a current phase, and a three-phase imbalance of a main power source are determined from the first voltage waveform dataset and the first current waveform dataset.
In some embodiments, the step 302 includes:
determining a period of voltage from the first voltage waveform dataset;
according to the period, respectively acquiring a plurality of data from the first voltage waveform data set and the first current waveform data set, and constructing a second voltage waveform data set and a second current waveform data set, wherein the second voltage waveform data set and the second current waveform data set respectively correspond to a first period and a second period, the duration of the first period and the duration of the second period are the same and are integer multiples of the period duration, and the second period leads to one quarter of the period duration of the first period;
determining the voltage effective value and the current effective value according to the second voltage waveform data set and the second current waveform data set respectively;
And processing the second voltage waveform data set and the second current waveform data set in a mode of multiplying the data sets and summing the data sets to obtain the current phase, and determining the three-phase unbalance according to the current phase and the voltage effective value.
In some embodiments, the processing the second voltage waveform data set and the second current waveform data set by means of data set multiplication and data set summation to obtain the current phase, and determining the three-phase imbalance according to the current phase and the voltage effective value includes:
respectively extracting data from the second voltage waveform data set and the second current waveform data set to construct three phase voltage waveform data sets and three phase current waveform data sets, wherein the three phase voltage waveform data sets and the three phase current waveform data sets respectively correspond to three phases of a main power supply;
respectively carrying out normalization processing on the three phase voltage waveform data sets and the three phase current waveform data sets to obtain three third voltage waveform data sets and three third current waveform data sets;
Determining three current phases according to a first formula, the three third voltage waveform data sets and the three third current waveform data sets, wherein the three current phases correspond to three phases of a main power supply, and the first formula is as follows:
wherein alpha is pn Current phase being the pn-th phase, U pn (dn) is the dn data of the third voltage waveform data set corresponding to the pn-th phase, I pn (dN) is the dN data of the third voltage waveform dataset corresponding to the pn-th phase, dN is the total number of data in the third voltage waveform dataset;
determining the active power and the reactive power of the three phases according to the voltage effective values of the three phases, the current effective values of the three phases and the three current phases;
and determining the three-phase unbalance according to the active power and the reactive power of the three phases.
In an exemplary aspect, the present invention first obtains voltage waveform data and current waveform data of a main power source in terms of power quality adjustment by a flexible converter device, and analyzes a voltage effective value, a current phase, and a three-phase imbalance of the main power source based on the waveform data. Before analyzing the effective voltage value, the period of the voltage waveform is first determined, a method for determining the voltage period is to determine a minimum waveform quantity according to the sampling rate of the voltage waveform data set and the possible range of the voltage waveform period, for example, the lowest limit of the period duration is 18 ms, the upper limit is 22 ms, the sampling rate of the voltage waveform data set is 6000 times per second, the sampling number corresponding to 18 ms should be 108 times, 108 pieces of data are continuously sampled from the voltage waveform data set, the sum of 108 pieces of data is calculated, if the sum is greater than a threshold (the threshold is usually a small number close to 0), 109 pieces of data are taken again and added with the previous sum, and the sum of 109 pieces of data is recorded, and the method is repeated until 132 pieces of data sum is obtained, the minimum sum is selected from the sum of 108 pieces of data to the sum of 132 pieces of data, for example, the minimum sum of data is 119 pieces of data to be collected in the period duration of the voltage waveform period, for example, the period duration is 351×6000=19.83 ms, and the frequency=19.83 Hz is 35.83.
After determining the period duration of the waveform, data of an integer number of period durations are extracted from the voltage waveform data set and the current waveform data set, respectively, for example, 119 data are extracted using the above example, and then the voltage effective value and the current effective value are obtained by squaring and summing the data, and then dividing the sum of the data by the total number of data, that is, 119, and multiplying the obtained data by the sampling rate.
Taking the solving process of the voltage effective value of a certain phase as an example, the process is expressed as follows:
in DU A (i) Is the ith data (corresponding to phase A) of the voltage data set, U A Is the effective value of the A phase voltage.
In determining the current phase, the embodiment of the invention firstly separates corresponding three-phase data sets from a voltage waveform data set and a current waveform data set, wherein the time length of the data sets corresponds to an integer times of the period time length, and in the waveform data set of the phase, the phase current waveform data set is advanced by one quarter of the period time length from time to time, the data sets are respectively normalized, and the phase of each phase current is calculated by applying a first formula:
wherein alpha is pn Current phase being the pn-th phase, U pn (dn) is the dn data of the third voltage waveform data set corresponding to the pn-th phase, I pn (dN) is the dN data of the third voltage waveform data set corresponding to the pn-th phase, and dN is the total number of data in the third voltage waveform data set.
The active power and the reactive power of each phase can be determined according to the phase, the voltage effective value and the current effective value of each phase, and the unbalance degree of the three phases is further determined.
In step 303, according to the voltage effective value, the current phase, the three-phase imbalance degree and the remaining capacity of the multi-port flexible current transformer, the three-phase grid-connected current and the three-phase grid-connected current phase of the multi-port flexible current transformer are adjusted, so that the output of the main power supply meets the voltage requirement, the power factor requirement and the three-phase imbalance requirement at the same time.
In some embodiments, the step 303 includes:
acquiring a power factor range, a voltage range, the residual capacity of the multi-port flexible converter device and a grid-connected instruction, wherein the multi-port flexible converter device outputs active power to a main power supply side according to the grid-connected instruction;
sequencing three phases of a main power supply to obtain a first phase, a second phase and a third phase, wherein the first phase is the phase with the highest voltage effective value, and the third phase is the phase with the lowest voltage effective value;
The first phase reduces the first active current disturbance quantity, and when the power factor of the first phase is higher than the lower limit of the power factor range and the current phase is negative, the first phase increases the first current phase disturbance quantity, and when the power factor of the first phase is lower than the upper limit of the power factor range and the current phase is positive, the first phase decreases the first current phase disturbance quantity;
the third phase increases a third active current disturbance quantity, and when the power factor of the third phase is lower than the upper limit of the power factor range and the current phase is negative, the third phase decreases the third current phase disturbance quantity, and when the power factor of the third phase is higher than the lower limit of the power factor range and the current phase is positive, the third phase increases the third current phase disturbance quantity;
and the second active current disturbance quantity is overlapped with the second active current disturbance quantity, and the current phase disturbance quantity of the second phase is increased or reduced within the allowable range of the residual capacity of the multi-port flexible converter device so as to enable the voltage of the second phase to be stabilized within the voltage range, wherein the second active current disturbance quantity is determined according to the difference value between the grid-connected indication and the active power of the first phase and the active power of the third phase.
In some embodiments, the increasing or decreasing the current phase disturbance amount of the second phase within the range allowed by the remaining capacity of the multi-port flexible current transformer to stabilize the voltage of the second phase within the voltage range includes:
if the second active current disturbance quantity is positive, increasing the second current phase disturbance quantity by the second phase when the difference between the voltage effective value of the second phase and the voltage range is positive, the power factor of the second phase is higher than the lower limit of the power factor range and the current phase is negative, and decreasing the second current phase disturbance quantity when the difference between the voltage effective value of the second phase and the voltage range is positive, the power factor of the second phase is lower than the upper limit of the power factor range and the current phase is positive;
and if the second active current disturbance quantity is a negative value, the second phase reduces the second current phase disturbance quantity when the difference between the voltage effective value of the second phase and the voltage range is a negative value, the power factor of the second phase is higher than the lower limit of the power factor range and the current phase is a negative value, and the second phase increases the second current phase disturbance quantity when the difference between the voltage effective value of the second phase and the voltage range is a negative value, the power factor of the second phase is lower than the upper limit of the power factor range and the current phase is a positive value.
Illustratively, embodiments of the present invention contemplate using the remaining capacity of the variable current device (the remaining capacity after the output or the stored energy) to adjust the voltage effective value, the current phase, and the three-phase imbalance of the main power source in accordance with the output indication.
Before starting the adjustment, the three phases of the main power supply are first ordered according to the effective voltage values.
For the phase with the highest voltage effective value, firstly reducing the active current according to the current effective value according to a preset proportion, then, if the power factor of the phase is higher than the lower limit of the power factor, indicating that a space for reducing the power factor exists, and if the current phase is negative, indicating that the load is an inductive load at the moment, reducing the power factor compensation of the load, namely increasing the phase of the current, so that the phase orderly regulates down the voltage on the premise of ensuring the power factor; if the power factor of the phase is below the upper power factor limit and the current phase is positive, indicating that the load is now a capacitive load, the power factor compensation to the load is reduced, i.e. the phase of the current is reduced, so that the phase is orderly brought down with the power factor guaranteed.
For the phase with the lowest voltage effective value, firstly increasing active current according to a preset proportion according to the current effective value, then, if the power factor of the phase is lower than the upper limit of the power factor, indicating that a space for reducing the power factor exists, and if the current phase is negative, indicating that the load is an inductive load at the moment, adding power factor compensation to the load, namely reducing the phase of the current, so that the phase can orderly regulate the voltage to be higher on the premise of ensuring the power factor; if the power factor of the phase is above the lower power factor limit and the current phase is positive, indicating that the load is now a capacitive load, the power factor compensation for the load is increased, i.e. the phase of the current is increased, so that the phase is orderly brought up to a higher voltage while ensuring the power factor.
And for the middle phase, firstly compensating the active current regulated in the process to meet the requirement of grid connection indication, and regulating the voltage of the phase in the residual capacity range to make the voltage of the phase be the median of the voltage range as much as possible. When the active current is positive, the voltage of the middle phase after compensation is raised, if the voltage of the middle phase before compensation is higher than the middle value of the voltage range, measures are needed to compensate, and the current phase is increased when the power factor is confirmed to be lower than the upper limit of the power factor range and the current phase is negative under the conditions, and the current phase is decreased when the power factor is higher than the lower limit of the power factor range and the current phase is positive. When the active current of the compensation is negative, which means that the voltage of the middle phase after the compensation is reduced, if the voltage of the phase before the compensation is lower than the median of the voltage range, measures are needed to compensate, and the embodiment of the invention increases the phase of the current when the power factor is confirmed to be higher than the lower limit of the power factor range and the phase of the current is negative under the condition, and increases the phase of the current when the power factor is lower than the upper limit of the power factor range and the phase of the current is positive.
The invention relates to an embodiment of a power quality management method, which comprises the steps of firstly acquiring a first voltage waveform data set and a first current waveform data set, wherein the first voltage waveform data set and the first current waveform data set are respectively obtained based on voltage and current output by a main power supply; then determining the effective voltage value, current phase and three-phase unbalance of the main power supply according to the first voltage waveform data set and the first current waveform data set; and finally, according to the voltage effective value, the current phase, the three-phase unbalance degree and the residual capacity of the multi-port flexible current transformer, adjusting the three-phase grid-connected current and the three-phase grid-connected current phase of the multi-port flexible current transformer so that the output of the main power supply simultaneously meets the voltage requirement, the power factor requirement and the three-phase unbalance requirement. The embodiment of the invention adjusts the voltage effective value based on the voltage effective value, the current phase, the three-phase unbalance degree and the residual capacity of the multi-port flexible converter device, so that the voltage at one side of the lower voltage in the three-phase unbalance is raised, the voltage at the other side of the higher voltage is lowered, and the power factor and the voltage range are considered, so that the improvement effect is good and the operation is more reliable.
The embodiment of the invention realizes the adjustment of three-phase voltage balance based on the adjustment of active power and reactive power, ensures that the output can be according to the system indication requirement, fully utilizes the residual capacity, has less equipment investment and higher resource utilization.
It should be understood that the sequence number of each step in the foregoing embodiment does not mean that the execution sequence of each process should be determined by the function and the internal logic, and should not limit the implementation process of the embodiment of the present invention.
The following are device embodiments of the invention, for details not described in detail therein, reference may be made to the corresponding method embodiments described above.
Fig. 4 is a functional block diagram of an apparatus for managing power quality according to an embodiment of the present invention, and referring to fig. 4, the apparatus for managing power quality includes: a waveform data acquisition module 401, a waveform analysis module 402, and a power quality management module 403, wherein:
a waveform data acquisition module 401, configured to acquire a first voltage waveform data set and a first current waveform data set, where the first voltage waveform data set and the first current waveform data set are obtained based on a voltage and a current output by a main power supply, respectively;
A waveform analysis module 402, configured to determine a voltage effective value, a current phase, and a three-phase imbalance of a main power supply according to the first voltage waveform data set and the first current waveform data set;
the power quality management module 403 is configured to adjust a three-phase grid-connected current and a three-phase grid-connected current phase of the multi-port flexible current transformer according to the voltage effective value, the current phase, the three-phase unbalance degree and the residual capacity of the multi-port flexible current transformer, so that the output of the main power supply meets the voltage requirement, the power factor requirement and the three-phase unbalance requirement simultaneously.
Fig. 5 is a functional block diagram of an electronic device provided by an embodiment of the present invention. As shown in fig. 5, the electronic apparatus 5 of this embodiment includes: a processor 500 and a memory 501, said memory 501 having stored therein a computer program 502 executable on said processor 500. The processor 500, when executing the computer program 502, implements the steps of the various power quality management methods and embodiments described above, such as steps 301 through 303 shown in fig. 1.
Illustratively, the computer program 502 may be partitioned into one or more modules/units that are stored in the memory 501 and executed by the processor 500 to accomplish the present invention.
The electronic device 5 may be a computing device such as a desktop computer, a notebook computer, a palm computer, a cloud server, etc. The electronic device 5 may include, but is not limited to, a processor 500, a memory 501. It will be appreciated by those skilled in the art that fig. 5 is merely an example of the electronic device 5 and is not meant to be limiting of the electronic device 5, and may include more or fewer components than shown, or may combine certain components, or different components, e.g., the electronic device 5 may further include input-output devices, network access devices, buses, etc.
The processor 500 may be a central processing unit (Central Processing Unit, CPU), but may also be other general purpose processors, digital signal processors (Digital Signal Processor, DSP), application specific integrated circuits (Application Specific Integrated Circuit, ASIC), field programmable gate arrays (Field-Programmable Gate Array, FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The memory 501 may be an internal storage unit of the electronic device 5, such as a hard disk or a memory of the electronic device 5. The memory 501 may also be an external storage device of the electronic device 5, such as a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card) or the like, which are provided on the electronic device 5. Further, the memory 501 may also include both an internal storage unit and an external storage device of the electronic device 5. The memory 501 is used to store the computer program 502 and other programs and data required by the electronic device 5. The memory 501 may also be used to temporarily store data that has been output or is to be output.
It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-described division of the functional units and modules is illustrated, and in practical application, the above-described functional distribution may be performed by different functional units and modules according to needs, i.e. the internal structure of the apparatus is divided into different functional units or modules to perform all or part of the above-described functions. The functional units and modules in the embodiment may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit, where the integrated units may be implemented in a form of hardware or a form of a software functional unit. In addition, specific names of the functional units and modules are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present application. The specific working process of the units and modules in the above system may refer to the corresponding process in the foregoing method embodiment, and will not be described herein again.
In the foregoing embodiments, the descriptions of the embodiments are focused on, and the details or descriptions of other embodiments may be referred to for those parts of an embodiment that are not described in detail or are described in detail.
Those of ordinary skill in the art will appreciate that the elements and algorithm steps described in connection with the embodiments disclosed herein can be implemented as electronic hardware, or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
In the embodiments provided in the present invention, it should be understood that the disclosed apparatus/electronic device and method may be implemented in other manners. For example, the apparatus/electronic device embodiments described above are merely illustrative, e.g., the division of the modules or units is merely a logical function division, and there may be additional divisions when actually implemented, e.g., multiple units or components may be combined or integrated into another system, or some features may be omitted or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection via interfaces, devices or units, which may be in electrical, mechanical or other forms.
The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the embodiment.
In addition, each functional unit in each embodiment of the present invention may be integrated in one processing unit, each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.
The integrated modules/units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a computer readable storage medium. Based on this understanding, the present invention may also be implemented by implementing all or part of the procedures in the methods of the above embodiments, or by instructing the relevant hardware by a computer program, where the computer program may be stored in a computer readable storage medium, and the computer program may be implemented by implementing the steps of the embodiments of the methods and apparatuses described above when executed by a processor. Wherein the computer program comprises computer program code which may be in source code form, object code form, executable file or some intermediate form etc. The computer readable medium may include: any entity or device capable of carrying the computer program code, a recording medium, a U disk, a removable hard disk, a magnetic disk, an optical disk, a computer Memory, a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), an electrical carrier signal, a telecommunications signal, a software distribution medium, and so forth.
The above embodiments are only for illustrating the technical solution of the present invention, and are not limited thereto; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention, and they should be included in the protection scope of the present invention.
Claims (10)
1. A multi-port flexible deflector device comprising: a switching unit and a current converting unit;
the switch unit comprises a first switch, a second switch, a third switch, a fourth switch and a first electronic switch element; the first end of the first switch is electrically connected with the first end of the second switch and the second end of the fourth switch, two ends of the first electronic switch are respectively electrically connected with the second end of the second switch and the first end of the fourth switch, and the first electronic switch is connected with the third switch in parallel;
the current transformation unit comprises a first current transformer and a second current transformer, and the second end of the first current transformer and the second end of the second current transformer are electrically connected with the first end of the fourth switch;
When the first end of the first converter and the first end of the second converter are respectively connected with a distributed power supply and energy storage equipment, the output power of the first converter and the output power of the second converter are adjusted to finish the adjustment of the output power quality of the second end of the fourth switch.
2. The multi-port flexible current transformer device of claim 1, wherein the current transformer unit further comprises: an isolation transformer, a fifth switch, a sixth switch and a seventh switch;
the first end of the isolation transformer is electrically connected with the first end of the fourth switch, the second end of the isolation transformer is electrically connected with the first end of the fifth switch, and the second end of the fifth switch is electrically connected with the second end of the sixth switch and the first end of the seventh switch respectively;
the first current transformer and the second current transformer respectively comprise: and the rectifying end of the first converter and the rectifying end of the second converter are respectively and electrically connected with the first end of the sixth switch and the second end of the seventh switch.
3. A method of power quality management, characterized in that it is applied to the multi-port flexible current transformer device according to any one of claims 1-2, and comprises:
Acquiring a first voltage waveform data set and a first current waveform data set, wherein the first voltage waveform data set and the first current waveform data set are respectively obtained based on voltage and current output by a main power supply;
determining a voltage effective value, a current phase and three-phase unbalance of a main power supply according to the first voltage waveform data set and the first current waveform data set;
and according to the voltage effective value, the current phase, the three-phase unbalance degree and the residual capacity of the multi-port flexible current transformer, adjusting the three-phase grid-connected current and the three-phase grid-connected current phase of the multi-port flexible current transformer so that the output of the main power supply simultaneously meets the voltage requirement, the power factor requirement and the three-phase unbalance requirement.
4. The power quality management method according to claim 3, wherein said determining the voltage effective value, the current phase, and the three-phase imbalance of the main power source from the first voltage waveform data set and the first current waveform data set includes:
determining a period of voltage from the first voltage waveform dataset;
according to the period, respectively acquiring a plurality of data from the first voltage waveform data set and the first current waveform data set, and constructing a second voltage waveform data set and a second current waveform data set, wherein the second voltage waveform data set and the second current waveform data set respectively correspond to a first period and a second period, the duration of the first period and the duration of the second period are the same and are integer multiples of the period duration, and the second period leads to one quarter of the period duration of the first period;
Determining the voltage effective value and the current effective value according to the second voltage waveform data set and the second current waveform data set respectively;
and processing the second voltage waveform data set and the second current waveform data set in a mode of multiplying the data sets and summing the data sets to obtain the current phase, and determining the three-phase unbalance according to the current phase and the voltage effective value.
5. The power quality management method according to claim 4, wherein said processing said second voltage waveform data set and said second current waveform data set by means of data set multiplication and data set summation to obtain said current phase and determining said three-phase imbalance from said current phase and said voltage effective value comprises:
respectively extracting data from the second voltage waveform data set and the second current waveform data set to construct three phase voltage waveform data sets and three phase current waveform data sets, wherein the three phase voltage waveform data sets and the three phase current waveform data sets respectively correspond to three phases of a main power supply;
Respectively carrying out normalization processing on the three phase voltage waveform data sets and the three phase current waveform data sets to obtain three third voltage waveform data sets and three third current waveform data sets;
determining three current phases according to a first formula, the three third voltage waveform data sets and the three third current waveform data sets, wherein the three current phases correspond to three phases of a main power supply, and the first formula is as follows:
wherein alpha is pn Current phase being the pn-th phase, U pn (dn) is the dn data of the third voltage waveform data set corresponding to the pn-th phase, I pn (dN) is the dN data of the third voltage waveform dataset corresponding to the pn-th phase, dN is the total number of data in the third voltage waveform dataset;
determining the active power and the reactive power of the three phases according to the voltage effective values of the three phases, the current effective values of the three phases and the three current phases;
and determining the three-phase unbalance according to the active power and the reactive power of the three phases.
6. The power quality management method according to any one of claims 3 to 5, wherein adjusting the three-phase grid-connected current and the three-phase grid-connected current phase of the multi-port flexible current transformer according to the voltage effective value, the current phase, the three-phase imbalance and the remaining capacity of the multi-port flexible current transformer so that the output of the main power supply satisfies the voltage requirement, the power factor requirement and the three-phase imbalance requirement simultaneously comprises:
Acquiring a power factor range, a voltage range, the residual capacity of the multi-port flexible converter device and a grid-connected instruction, wherein the multi-port flexible converter device outputs active power to a main power supply side according to the grid-connected instruction;
sequencing three phases of a main power supply to obtain a first phase, a second phase and a third phase, wherein the first phase is the phase with the highest voltage effective value, and the third phase is the phase with the lowest voltage effective value;
the first phase reduces the first active current disturbance quantity, and when the power factor of the first phase is higher than the lower limit of the power factor range and the current phase is negative, the first phase increases the first current phase disturbance quantity, and when the power factor of the first phase is lower than the upper limit of the power factor range and the current phase is positive, the first phase decreases the first current phase disturbance quantity;
the third phase increases a third active current disturbance quantity, and when the power factor of the third phase is lower than the upper limit of the power factor range and the current phase is negative, the third phase decreases the third current phase disturbance quantity, and when the power factor of the third phase is higher than the lower limit of the power factor range and the current phase is positive, the third phase increases the third current phase disturbance quantity;
And the second active current disturbance quantity is overlapped with the second active current disturbance quantity, and the current phase disturbance quantity of the second phase is increased or reduced within the allowable range of the residual capacity of the multi-port flexible converter device so as to enable the voltage of the second phase to be stabilized within the voltage range, wherein the second active current disturbance quantity is determined according to the difference value between the grid-connected indication and the active power of the first phase and the active power of the third phase.
7. The power quality management method according to claim 5, wherein said increasing or decreasing the current phase disturbance amount of the second phase within the range allowed by the remaining capacity of the multi-port flexible current transformer to stabilize the voltage of the second phase within the voltage range includes:
if the second active current disturbance quantity is positive, increasing the second current phase disturbance quantity by the second phase when the difference between the voltage effective value of the second phase and the voltage range is positive, the power factor of the second phase is higher than the lower limit of the power factor range and the current phase is negative, and decreasing the second current phase disturbance quantity when the difference between the voltage effective value of the second phase and the voltage range is positive, the power factor of the second phase is lower than the upper limit of the power factor range and the current phase is positive;
And if the second active current disturbance quantity is a negative value, the second phase reduces the second current phase disturbance quantity when the difference between the voltage effective value of the second phase and the voltage range is a negative value, the power factor of the second phase is higher than the lower limit of the power factor range and the current phase is a negative value, and the second phase increases the second current phase disturbance quantity when the difference between the voltage effective value of the second phase and the voltage range is a negative value, the power factor of the second phase is lower than the upper limit of the power factor range and the current phase is a positive value.
8. A power quality management apparatus for implementing a power quality management method according to any one of claims 3 to 7, the power quality management apparatus comprising:
the waveform data acquisition module is used for acquiring a first voltage waveform data set and a first current waveform data set, wherein the first voltage waveform data set and the first current waveform data set are respectively obtained based on the voltage and the current output by the main power supply;
the waveform analysis module is used for determining the voltage effective value, the current phase and the three-phase unbalance of the main power supply according to the first voltage waveform data set and the first current waveform data set;
And
And the electric energy quality management module is used for adjusting the three-phase grid-connected current and the three-phase grid-connected current phase of the multi-port flexible current transformer according to the voltage effective value, the current phase, the three-phase unbalance degree and the residual capacity of the multi-port flexible current transformer so that the output of the main power supply can meet the voltage requirement, the power factor requirement and the three-phase unbalance requirement simultaneously.
9. An electronic device comprising a memory and a processor, the memory having stored therein a computer program executable on the processor, characterized in that the processor, when executing the computer program, implements the steps of the method according to any of the preceding claims 3-7.
10. A computer readable storage medium storing a computer program, characterized in that the computer program when executed by a processor implements the steps of the method according to any of the preceding claims 3 to 7.
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