CN112909994A - Unbalanced input and output control method for three-phase inverter - Google Patents
Unbalanced input and output control method for three-phase inverter Download PDFInfo
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- CN112909994A CN112909994A CN202110085760.7A CN202110085760A CN112909994A CN 112909994 A CN112909994 A CN 112909994A CN 202110085760 A CN202110085760 A CN 202110085760A CN 112909994 A CN112909994 A CN 112909994A
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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
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/26—Arrangements for eliminating or reducing asymmetry in polyphase networks
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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
- H02J3/40—Synchronising a generator for connection to a network or to another generator
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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
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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
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/22—The renewable source being solar energy
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/50—Arrangements for eliminating or reducing asymmetry in polyphase networks
Abstract
The invention relates to an unbalanced input and output control method of a three-phase inverter, which is characterized in that the control method comprises the steps of re-determining the power limit value of each phase, increasing the power limit value of each phase, determining the power limit value of an alternating current side through PI control on the basis of the judgment result of the magnitude relation between each phase power sampling value and the total power sampling value of a three-phase electric meter and preset power threshold values, limiting the power limit value of each phase to adjust the power set value of the three-phase inverter, and thus the control of the three-phase inverter is realized. The invention can realize three-phase unbalanced input and output control on the inverter, thereby improving the quality of a power grid, avoiding electric energy waste, bringing greater economic benefit to single-phase charging users and realizing each phase anti-reflux of the three-phase power grid.
Description
Technical Field
The invention belongs to the technical field of power conversion, and particularly relates to a method for carrying out unbalanced input and output control on a three-phase energy storage/grid-connected inverter, which is suitable for the industry of three-phase photovoltaic inverters.
Background
Solar energy is a high-quality clean energy, and the core of solar power generation is a photovoltaic inverter. The normal three-phase photovoltaic inverter generates power, or the energy storage inverter charges from the grid, all in a balanced mode (the balanced mode means that the power of each phase is equal), and the three-phase power is either all output or all input. However, the balance mode is not favorable for improving the quality of the power grid, generally, the voltages of the three-phase power grid cannot be absolutely balanced, the loads of each phase are not equal, the loads of each phase of the three-phase power grid are not balanced, and when the balanced output of the inverter may cause the energy of the phase with small load to be excessive, the voltage is increased; when the inverter absorbs the energy of the power grid in a balanced manner, the energy of the phase with a large load is insufficient, the voltage is reduced, the quality of the power grid is affected, and the balance of the three-phase power grid is not facilitated. In addition, the users who charge the electricity meter in a single phase are not economical in the balanced mode, many power grid companies adopt single-phase charging, the price for buying electricity is higher than the price for selling electricity, and in the balanced mode, when the total input and output power is 0, the situation that the electricity is bought in phase A and the electricity is sold in phase B exists, and the single-phase charging is not economical.
Therefore, if the inverter adopts unbalanced input and output, the advantages are that:
(1) the output power of each phase can be determined according to the spontaneous self-use of the load, so that the input and output of each phase power and the total three-phase power at the electric meter end can reach about 0w, and single-phase charging is more economical;
(2) according to the safety requirements of the power grid, if an over-voltage and under-voltage curve determines the output and input power, the unbalance function can realize that the output power of each phase is adjusted according to the phase voltage of each phase;
(3) when the electricity utilization of the three-phase power grid is unbalanced, the energy of the phase with light load can be transferred to the phase with large electricity utilization load, and the energy can be realized without the participation of photovoltaic energy and battery energy;
(4) direct scheduling can be achieved by accepting energy scheduling commands to determine the output and input power of each phase.
Disclosure of Invention
The invention aims to provide a three-phase inverter unbalanced input and output control method which can improve the quality of a power grid, avoid electric energy waste and bring economic benefits to users.
In order to achieve the purpose, the invention adopts the technical scheme that:
the unbalanced input and output control method of the three-phase inverter is used for controlling the three-phase inverter, a three-phase electric meter is arranged between the three-phase inverter and a power grid, and the unbalanced input and output control method of the three-phase inverter comprises the following steps:
step 1: presetting a first power threshold M and a second power threshold N, wherein M is larger than N;
step 2: judging whether each phase power sampling value of the three-phase electric meter meets the condition that each phase power sampling value is smaller than-MW, if so, re-determining the power limit value of each phase based on the minimum value in each phase power sampling value, further carrying out amplitude limiting on each phase power limit value to adjust the power set value of the three-phase inverter, and if not, executing the step 3;
and step 3: judging whether each phase power sampling value of the three-phase electric meter meets the condition that each phase power sampling value is smaller than-NW, if so, increasing the power limit value of each phase, further carrying out amplitude limiting on each phase power limit value to adjust the power given value of the three-phase inverter, and if not, executing the step 4;
and 4, step 4: judging whether the total power sampling value of the three-phase electric meter meets the condition that the total power sampling value is larger than 0, if so, determining a power given reference value of each phase based on each phase power sampling value and the total power sampling value of the three-phase electric meter and executing the step 5, if not, obtaining an alternating current side power limit value of the three-phase inverter through PI control, and further carrying out amplitude limiting on each phase power limit value to adjust a power given value of the three-phase inverter;
and 5: and carrying out PI control on the basis of the AC side power sampling value of the three-phase inverter and the total power sampling value of the three-phase electric meter to obtain an AC side power limit value of the three-phase inverter, and further carrying out amplitude limiting on each phase power limit value to adjust a power given value of the three-phase inverter.
The unbalanced input/output control method of the three-phase inverter further comprises a preparation step before the step 1, wherein the preparation step comprises the following steps: and judging whether the three-phase inverter enables a three-phase imbalance function, and if the three-phase imbalance function of the three-phase inverter is enabled, continuing to execute the step 1.
And setting a dynamic detection zone bit for representing whether the three-phase unbalance function of the three-phase inverter is enabled, and judging whether the three-phase inverter is enabled by the dynamic detection zone bit.
In step 2, the method for determining the power limit value of each phase includes: and respectively subtracting the maximum value in the power sampling values of all phases of the three-phase electric meter from each equivalent power limiting value so as to respectively obtain new power limiting values of all phases.
In step 4, the method for determining the power given reference value of each phase includes: and respectively subtracting the total power sampling value/3 from each phase power sampling value of the three-phase electric meter so as to respectively obtain the power given reference value of each phase.
In the step 5, the total power sampling value of the three-phase electric meter is subtracted from the ac side power sampling value of the three-phase inverter, and the ac side power limit value of the three-phase inverter is obtained through PI control.
Due to the application of the technical scheme, compared with the prior art, the invention has the following advantages: the invention can realize three-phase unbalanced input and output control on the inverter, thereby improving the quality of a power grid, avoiding electric energy waste, bringing greater economic benefit to single-phase charging users and realizing each phase anti-reflux of the three-phase power grid.
Drawings
Fig. 1 is a schematic view of an application scenario of the unbalanced input/output control method of the three-phase inverter of the present invention.
Fig. 2 is a flow chart of an unbalanced input/output control method of a three-phase inverter according to the present invention.
Detailed Description
The invention will be further described with reference to examples of embodiments shown in the drawings to which the invention is attached.
The first embodiment is as follows: as shown in fig. 1, the solar power generation system includes a solar cell PV, a single/three-phase grid-connected inverter, a three-phase energy storage inverter, an energy storage cell, and the like, the single/three-phase grid-connected inverter and the three-phase energy storage inverter are both connected to a power grid AC, and a three-phase electricity meter CT is disposed between the three-phase inverter (including the three-phase grid-connected inverter and the three-phase energy storage inverter) and the power grid, and can detect three-phase power and total power respectively.
For the above system, the operation states are divided into the following cases (Pa, Pb, Pc below represent the power of ABC three phases, prefix plus "+" or no prefix represents output to the grid, "-" represents input from the grid to the inverter device):
1. three phases are all in an output state, the output power of the three phases is respectively + Pa, + Pb and Pc, and Pa, Pb and Pc are respectively arbitrary values (allowed to be 0 and equivalent to the phase not working), and the sizes of the three phases can be completely different;
2. three phases are all in an input state, the output power of the three phases is-Pa, -Pb and-Pc respectively, the Pa, the Pb and the Pc are respectively arbitrary values (allowed to be 0 and equivalent to the phase not working), and the sizes of the three phases can be completely different;
3. the three phases are all in a one-phase output two-phase input state, the combination of the three-phase input and output power is (Pa, -Pb, -Pc) or (-Pa, -Pb, Pc), the Pa, Pb, Pc are respectively arbitrary values (allowed to be 0, equivalent to the phase not working), and the sizes can be completely different;
4. the three phases are all in a two-phase output one-phase input state, the combination of the three-phase input and output power is (-Pa, Pb, Pc) or (Pa, -Pb, Pc) or (Pa, Pb, -Pc), and the Pa, Pb, Pc are respectively any value (allowed to be 0, equivalent to the phase not working), and the sizes of the three phases can be completely different.
For the system, unbalanced input and output can be realized through a control algorithm, and the input and output power control can be performed according to the power utilization condition of each phase, or according to characteristic information such as voltage and frequency of a power grid, or legal requirements, or centralized scheduling of the power grid, or scheduling of other controllers.
As shown in fig. 2, an unbalanced input/output control method for a three-phase inverter, which can be adopted by the above system, includes the following steps:
the preparation method comprises the following steps: and judging whether the three-phase inverter enables a three-phase imbalance function or not. If the three-phase unbalance function of the three-phase inverter is not enabled, gradually increasing the power limit value of each phase to recover to the rated power limit value, and outputting the three-phase power in a balanced manner; if the three-phase imbalance function of the three-phase inverter is enabled, the step 1 is continuously executed, and the control method of the three-phase imbalance is entered.
In the preliminary step, a dynamic detection flag for indicating whether the three-phase imbalance function of the three-phase inverter is enabled may be set, and then whether the three-phase imbalance function of the three-phase inverter is enabled is determined by using the dynamic detection flag.
Step 1: a first power threshold M and a second power threshold N are preset, M is greater than N, and M, N are positive numbers.
Step 2: and judging whether each phase power sampling value of the three-phase electric meter meets the condition that each phase power sampling value is smaller than-MW.
And if the three-phase power is met, the three-phase power is bought from the power grid, and a quick recovery method is provided, so that the power limit value of each phase is determined again based on the minimum value in the power sampling value of each phase, and the power limit value of each phase is limited to adjust the power given value of the three-phase inverter. The method for determining the power limit value of each phase comprises the following steps: and respectively subtracting the maximum value of the power sampling values of all phases of the three-phase electric meter from each equivalent power limiting value (the maximum value is the minimum value of the absolute value because all the power sampling values of all the phases of the three-phase electric meter are negative values), so as to respectively obtain new power limiting values of all the phases, and quickly recover the balance of the power of a certain phase.
If not, executing step 3.
And step 3: and judging whether each phase power sampling value of the three-phase electric meter meets the condition that each phase power sampling value is smaller than-NW.
If the maximum power limit value meets the maximum power limit value, increasing the power limit value of each phase to the rated power limit value, preventing the MPPT of the three-phase inverter from being influenced, and further carrying out amplitude limiting on the power limit value of each phase to adjust the power given value of the three-phase inverter.
If not, executing step 4.
And 4, step 4: and judging whether the total power sampling value of the three-phase electric meter meets the condition that the total power sampling value is more than 0.
If the power is satisfied, the power can be used for grid-connected power generation or energy storage battery stir-charging, the power of each phase with unbalanced three phases does not need to be realized by using the power, so that the power of the portion needs to be evenly distributed to the three phases to serve as a power given reference value, the power given reference value of each phase is determined based on the power sampling value of each phase and the total power sampling value of the three-phase electric meter, and step 5 is executed. The method for determining the power given reference value of each phase comprises the following steps: and respectively subtracting the total power sampling value/3 from each phase power sampling value of the three-phase electric meter so as to respectively obtain the power given reference value of each phase.
If the power is not satisfied, the AC side power limit value of the three-phase inverter is obtained directly through PI control, and then the power limit value of each phase is limited to adjust the power given value of the three-phase inverter.
And 5: the AC side power limit value of the three-phase inverter is obtained by PI control based on the AC side power sampling value Pac of the three-phase inverter and the total power sampling value of the three-phase electric meter, namely, the AC side power sampling value of the three-phase inverter is subtracted from the total power sampling value of the three-phase electric meter, the AC side power limit value of the three-phase inverter is obtained by PI control, and then the power limit value of each phase is limited by combining the power given reference value of each phase to adjust the power given value of the three-phase inverter. And scheduling according to an internal power control algorithm of the inverter as an active control value of unbalanced input and output of each phase.
Through the steps, the input and output of the three-phase inverter are controlled by adjusting the given power value of the three-phase inverter, and the unbalanced input and output function is realized. The method is an automatic energy regulation and management method, is suitable for application scenes of respective charging of a three-phase power grid, improves the quality of the power grid compared with a balanced input and output mode of a traditional three-phase inverter, avoids electric energy waste, and brings greater economic benefits to single-phase charging users. Each phase of the three-phase power grid can be prevented from flowing backwards.
The above embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.
Claims (6)
1. The unbalanced input and output control method of the three-phase inverter is used for controlling the three-phase inverter, a three-phase electric meter is arranged between the three-phase inverter and a power grid, and the unbalanced input and output control method is characterized in that: the unbalanced input and output control method of the three-phase inverter comprises the following steps:
step 1: presetting a first power threshold M and a second power threshold N, wherein M is larger than N;
step 2: judging whether each phase power sampling value of the three-phase electric meter meets the condition that each phase power sampling value is smaller than-MW, if so, re-determining the power limit value of each phase based on the minimum value in each phase power sampling value, further carrying out amplitude limiting on each phase power limit value to adjust the power set value of the three-phase inverter, and if not, executing the step 3;
and step 3: judging whether each phase power sampling value of the three-phase electric meter meets the condition that each phase power sampling value is smaller than-NW, if so, increasing the power limit value of each phase, further carrying out amplitude limiting on each phase power limit value to adjust the power given value of the three-phase inverter, and if not, executing the step 4;
and 4, step 4: judging whether the total power sampling value of the three-phase electric meter meets the condition that the total power sampling value is larger than 0, if so, determining a power given reference value of each phase based on each phase power sampling value and the total power sampling value of the three-phase electric meter and executing the step 5, if not, obtaining an alternating current side power limit value of the three-phase inverter through PI control, and further carrying out amplitude limiting on each phase power limit value to adjust a power given value of the three-phase inverter;
and 5: and carrying out PI control on the basis of the AC side power sampling value of the three-phase inverter and the total power sampling value of the three-phase electric meter to obtain an AC side power limit value of the three-phase inverter, and further carrying out amplitude limiting on each phase power limit value to adjust a power given value of the three-phase inverter.
2. The unbalanced input/output control method of the three-phase inverter according to claim 1, characterized in that: the unbalanced input/output control method of the three-phase inverter further comprises a preparation step before the step 1, wherein the preparation step comprises the following steps: and judging whether the three-phase inverter enables a three-phase imbalance function, and if the three-phase imbalance function of the three-phase inverter is enabled, continuing to execute the step 1.
3. The unbalanced input/output control method of the three-phase inverter according to claim 2, characterized in that: and setting a dynamic detection zone bit for representing whether the three-phase unbalance function of the three-phase inverter is enabled, and judging whether the three-phase inverter is enabled by the dynamic detection zone bit.
4. The unbalanced input/output control method of the three-phase inverter according to any one of claims 1 to 3, characterized in that: in step 2, the method for determining the power limit value of each phase includes: and respectively subtracting the maximum value in the power sampling values of all phases of the three-phase electric meter from each equivalent power limiting value so as to respectively obtain new power limiting values of all phases.
5. The unbalanced input/output control method of the three-phase inverter according to any one of claims 1 to 3, characterized in that: in step 4, the method for determining the power given reference value of each phase includes: and respectively subtracting the total power sampling value/3 from each phase power sampling value of the three-phase electric meter so as to respectively obtain the power given reference value of each phase.
6. The unbalanced input/output control method of the three-phase inverter according to any one of claims 1 to 3, characterized in that: in the step 5, the total power sampling value of the three-phase electric meter is subtracted from the ac side power sampling value of the three-phase inverter, and the ac side power limit value of the three-phase inverter is obtained through PI control.
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| CN117277512B (en) * | 2023-11-14 | 2024-04-09 | 深圳市德兰明海新能源股份有限公司 | Self-adaptive charging power adjusting method of three-phase energy storage system |
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| CN112909994B (en) | 2023-07-11 |
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