CN111525585A - Voltage-stabilizing energy-saving and three-phase imbalance treatment energy-saving coordination control method - Google Patents
Voltage-stabilizing energy-saving and three-phase imbalance treatment energy-saving coordination control method Download PDFInfo
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- CN111525585A CN111525585A CN202010638212.8A CN202010638212A CN111525585A CN 111525585 A CN111525585 A CN 111525585A CN 202010638212 A CN202010638212 A CN 202010638212A CN 111525585 A CN111525585 A CN 111525585A
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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
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
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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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- 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
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- 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 discloses a voltage-stabilizing energy-saving and three-phase imbalance treatment energy-saving coordination control method, which comprises the following steps of: in each electric energy quality control period, whether the load voltage deviates from the rated voltage or the common zero line current exists is judged according to the electric parameters in the power distribution and utilization system, then the basic values required by voltage compensation and current unbalance compensation of each phase are calculated, the maximum comprehensive energy saving amount is used as the target, the voltage-stabilizing energy-saving power, the three-phase unbalance control energy-saving power and the electric energy feedback power are comprehensively evaluated, the optimal voltage compensation value and the current unbalance compensation value are solved, and corresponding control signals are generated to provide the power electronic transformation devices connected in series and in parallel for the equipment to perform corresponding compensation, so that the method is suitable for the energy-saving equipment comprising the series power electronic transformation devices and the parallel power electronic transformation devices; the invention considers the influence of two modes of voltage stabilization energy saving and three-phase imbalance treatment energy saving on energy saving, and can effectively reduce the electric energy loss of the power distribution and utilization system.
Description
Technical Field
The invention belongs to the technical field of energy-saving control, and particularly relates to a voltage-stabilizing energy-saving and three-phase imbalance treatment energy-saving coordination control method.
Background
The energy-saving control technology is a control method for improving the quality of electric energy in the power utilization process of an enterprise by controlling energy-saving equipment so as to save the power utilization cost of the enterprise. The power quality problem is identified by detecting the voltage and current data of the load side, corresponding compensation is made for different power quality problems, extra loss caused by the power quality problem is reduced, and the purpose of energy conservation is achieved. The energy-saving control method not only can provide higher-quality electric energy quality for enterprises and reduce extra production and electricity consumption cost, but also plays an important role in relieving the problem of contradiction between energy supply and demand in areas, and therefore, the method has important significance in researching the energy-saving control technology of the power distribution and utilization system of the enterprises. The electric energy feedback means that the series power electronic conversion device and the parallel power electronic conversion device of the energy-saving equipment form an electric energy feedback loop, and the energy is absorbed by the series power electronic conversion device when the voltage reduction compensation is carried out and is fed back to the parallel power electronic conversion device through the electric energy feedback loop, so that the electric energy feedback is realized, and the energy consumption required by the treatment of the electric energy quality is reduced.
However, when solving the power quality problem in practice, if multiple power quality problems occur at the same time, how to determine the compensated capacity and perform corresponding control, so as to achieve overall energy saving is an urgent problem to be solved. On the basis of the problem, the overall energy-saving level can be more accurately evaluated by considering the feedback electric energy of the energy-saving equipment in the compensation process, so that the research on a voltage-stabilizing energy-saving and three-phase imbalance management energy-saving coordination control method combined with an electric energy feedback principle has important significance.
Through the literature search of the prior art, the energy-saving and emission-reducing effect evaluation research of the CVR and AVC technology (Schloser, Wanggenje, albizzia, Zernike, CVR and AVC technology [ J ] the power in east China, 2013,41(05):908 and 911.) quantifies the energy-saving effect of the voltage-reducing and electricity-saving strategy aiming at the aspect of voltage stabilization and energy saving, but no corresponding node strategy is provided aiming at the condition that the voltage is lower than the rated voltage. Aiming at the aspect of three-phase imbalance treatment energy conservation, a load distribution scheme is proposed for the research of a low-voltage distribution network three-phase imbalance energy-saving algorithm (military, courage, Liu crystal, research of a low-voltage distribution network three-phase imbalance energy-saving algorithm [ J ]. school news of China east traffic university, 2014,31(03):110 + 114+ 136.) to realize energy conservation, but under the application scene that other loads are difficult to realize distribution, the energy-saving scheme cannot realize ideal energy-saving effect. Most of the existing researches only consider to treat the single power quality problem, but also do not consider the power feedback condition possibly existing in the energy-saving process, and the researches on the treatment and energy-saving coordination control method for the multiple power quality problems by combining the power feedback principle have a gap.
Accordingly, the prior art is yet to be improved and developed.
Disclosure of Invention
The invention aims to provide a voltage-stabilizing energy-saving and three-phase imbalance treatment energy-saving coordination control method, which considers the energy-saving benefit of power quality treatment and the energy-saving benefit of power feedback under the condition of simultaneous voltage fluctuation and three-phase imbalance, optimally selects the compensation quantity of the power quality problem through an optimal energy-saving algorithm, and realizes the energy-saving effect under the condition to the maximum extent.
In order to achieve the purpose, the technical scheme of the invention is as follows: a voltage-stabilizing energy-saving and three-phase imbalance treatment energy-saving coordination control method is suitable for energy-saving equipment comprising series power electronic conversion devices and parallel power electronic conversion devices, and comprises the following steps:
s1: collecting voltage data of a low-voltage side and load side of an input end transformer by taking T as a power quality control period, simultaneously collecting three-phase load current and common zero line current data, and if the effective value of the load side voltage collected in the power quality control period deviates from the rated load voltage and has common zero line current or only one of the power quality problems occurs, sending a regulating command by the system to enter S2; otherwise, the system sends out an undetermined command, and the next power quality control cycle enters S1 again;
s2: the voltage deviation compensation is carried out in the series power electronic conversion device, the three-phase unbalanced current compensation is carried out in the parallel power electronic conversion device, and the voltage compensation basic value is calculated and obtained according to the voltage and current dataU BAnd each phase current unbalance degree compensation basic value
、
、
If only one kind of power quality problem exists, setting the other kind of compensation basic value as 0;
s3: is provided withk 1In order to compensate the coefficient for the voltage,k i2-（ithe phase current unbalance compensation coefficients are the compensation coefficients of the unbalance degrees of the phases A, B and C), the optimal compensation coefficients of the unbalance degrees of the voltages and the currents are obtained by calculation through an optimal energy-saving algorithm under the condition of comprehensively considering two factors of energy saving and electric energy feedback effects of voltage stabilization and three-phase unbalance treatment, compensation voltage control signals are sent to the series power electronic conversion devices according to obtained results, and compensation current control signals are sent to the parallel power electronic conversion devices;
s4: the power electronic conversion devices connected in series and in parallel carry out corresponding compensation according to the received compensation signals, and the energy-saving effect is achieved.
The voltage-stabilizing energy-saving and three-phase imbalance treatment energy-saving coordination control method comprises the step of compensating a basic value by using the voltage in the step S2U BThe method is determined by the collected actual effective value of the negative charge pressure and the known effective value of the rated negative charge pressure, and the calculation formula is as follows:
in the formula (I), the compound is shown in the specification,U ris an effective value of the actual negative charge voltage,U Nis rated negativeEffective value of charged voltage;
in addition, each phase current unbalance degree compensation basic value
、
、
The calculation formula is determined by the collected current of each phase and is as follows:
in the formula (I), the compound is shown in the specification,I avgthe average value of the three-phase current effective values is obtained.
The voltage-stabilizing energy-saving and three-phase imbalance treatment energy-saving coordination control method comprises the following specific steps of:
s31: calculating voltage-stabilizing energy-saving powerP US：
In the formula (I), the compound is shown in the specification,k 1in order to compensate the coefficient for the voltage,U Bto compensate the base value for the voltage, INA load phase current rating;
s32: calculating three-phase unbalance treatment energy-saving powerP TS：
In the formula (I), the compound is shown in the specification,
(i= A, B, C) are compensation values of current unbalance,
(i= A, B, C) each current unbalance degree compensation basic value,k i2-（i= A, B, C) unbalance degree compensation coefficient of each phase current,I avgis the average value of the effective values of three-phase current, RLIs a line equivalent resistor;
s33: calculating electric energy feedback powerP FB：
In the formula (I), the compound is shown in the specification,P Ifor series power electronic conversion devices with a compensation factor ofk 1The regulation of the time-consuming power is power consuming,P Pfor parallel power electronic conversion devices with a compensation factor ofk i2-（iRegulation in case of = a, B, C) consumed power;
s34: calculating comprehensive energy-saving powerE：
And solving the compensation coefficientk 1Andk i2-（ioptimal configuration values of = A, B, C)k 1 'Andk i2- '（i= a, B, C) so that the power is comprehensively savedETaking the maximum value, the compensation factork 1Andk i2-（ivalue range of = A, B, C) [0, 1%]；
S35: obtaining a voltage compensation value based on the optimal configuration parameters of S34U BC=k 1 'UBAnd each phase current unbalance degree compensation value
（i=A,B,C）。
The voltage-stabilizing energy-saving and three-phase imbalance treatment energy-saving coordination control method is characterized in that the power quality problem refers to that: the effective value of the load side voltage deviates from the load rated voltage and a common zero line current exists.
Has the advantages that: based on topology of energy-saving equipment and detected voltage and current data, under the condition of simultaneous voltage fluctuation and three-phase unbalance, energy-saving benefit of power quality control and energy-saving benefit of power feedback are considered at the same time, compensation quantity of power quality problems is optimally selected through an optimal energy-saving algorithm, and optimal energy-saving coordination control is realized; on one hand, the corresponding electric energy loss is reduced by treating two electric energy quality problems of voltage fluctuation and three-phase imbalance, on the other hand, the power electronic conversion device based on the energy-saving equipment realizes power balance, and the series and parallel electric electronic conversion devices form an electric energy feedback loop, so that the energy consumption required by treating the electric energy quality is reduced, and the aim of saving energy is fulfilled.
Drawings
FIG. 1 is a flow chart of the voltage-stabilizing energy-saving and three-phase imbalance treatment energy-saving coordination control method of the invention.
Fig. 2 is a flowchart of calculating an optimal voltage compensation value and current imbalance compensation value according to the present invention.
Fig. 3 is a topology diagram of an energy saving device to which the present invention is applicable.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer and clearer, the present invention is further described in detail below with reference to the accompanying drawings and examples.
The invention is mainly suitable for energy-saving equipment containing series power electronic conversion devices and parallel power electronic conversion devices.
Fig. 3 is a topological diagram of an energy-saving device to which the present invention is applied, fig. 1 is a flowchart of an energy-saving coordination control method applied to such an energy-saving device, and fig. 2 is a flowchart of calculating an optimal voltage compensation value and a current imbalance compensation value for the present invention.
As shown in fig. 3, the energy saving device mainly comprises a series power electronic converter and a parallel power electronic converter, wherein the parallel power electronic converter is connected in parallel with the low-voltage side outlet of the main circuit distribution transformer and is also connected with the series power electronic converter, and the series power electronic converter is connected in series with the load through a coupling transformer. The energy-saving device comprises a three-phase rectification inverter module 1, a parallel side switch S1, a series side switch S2, a series side coupling transformer T1, a coupling transformer bypass switch S3 and a main circuit bypass switch S4, the three-phase rectification inversion module 1 is connected in parallel with the low-voltage side outlet of the main circuit transformer 2 through a parallel side switch S1, the three-phase rectification inverter module 1 is connected with a series side coupling transformer T1 through a series side switch S2, the secondary side winding of the series side coupling transformer T1 is connected in series with the main circuit three-phase load 3, the coupling transformer bypass switch S3 is connected in parallel with the series side coupling transformer T1, the main circuit bypass switch S4 is connected in parallel between the low-voltage side outlet of the distribution transformer and the main circuit three-phase load 3, the main circuit transformer 2 is connected with the inlet wire end in parallel with the main circuit switch 4 and the secondary side winding of the series side coupling transformer T1.
As shown in FIG. 1, the invention discloses a voltage-stabilizing energy-saving and three-phase imbalance treatment energy-saving coordination control method, which comprises the following steps:
s1: collecting voltage data of a low-voltage side and voltage data of a load side of an input end transformer by taking T as an electric energy quality control period, and simultaneously collecting three-phase load current and common zero line current data; if the effective value of the voltage at the load side collected in the power quality control period deviates from the rated voltage of the load and a common zero line current exists, or only one power quality problem occurs, the system sends out an adjusting command and enters S2; otherwise, the system sends out an undetermined command, and the next power quality control cycle enters S1 again;
s2: the voltage deviation compensation is carried out in the series power electronic conversion device, the three-phase unbalanced current compensation is carried out in the parallel power electronic conversion device, and the voltage compensation basic value is calculated and obtained according to the voltage and current dataU BAnd each phase current unbalance degree compensation basic value
、
、
If only one kind of power quality problem exists, setting the other kind of compensation basic value as 0;
s3: is provided withk 1In order to compensate the coefficient for the voltage,k i2-（ithe phase current unbalance compensation coefficients are the compensation coefficients of the unbalance degrees of the phases A, B and C), the optimal compensation coefficients of the unbalance degrees of the voltages and the currents are obtained by calculation through an optimal energy-saving algorithm under the condition of comprehensively considering two factors of energy saving and electric energy feedback effects of voltage stabilization and three-phase unbalance treatment, compensation voltage control signals are sent to the series power electronic conversion devices according to obtained results, and compensation current control signals are sent to the parallel power electronic conversion devices;
s4: the power electronic conversion devices connected in series and in parallel carry out corresponding compensation according to the received compensation signals, and the energy-saving effect is achieved.
The above-mentionedk 1Andk i2-（i= a, B, C) characterizes the actual voltage compensation value as a percentage of the calculated voltage base value and the actual current imbalances as a percentage of the calculated current imbalances.
As shown in fig. 1, the flow of the coordination control method of the present invention is as follows: the method comprises the following steps that when an electric energy quality control period begins, voltage data of a low-voltage side of a transformer at an input end and voltage data of a load side are collected, three-phase load current and common zero line current data are collected at the same time, and when the condition that the effective value of the voltage of the load side deviates from the rated voltage of the load and the common zero line current exists is detected, a system sends out an adjusting command; calculating to obtain a voltage compensation basic value U according to the voltage and current dataBAnd each phase current unbalance degree compensation basic value
、
、
(ii) a Calculating an optimal voltage compensation UBCAnd current imbalance compensation value
(i= a, B, C); then sending a compensation voltage control signal to the series power electronic conversion device and sending a compensation current control signal to the parallel power electronic conversion device; and finally, the power electronic conversion devices connected in series and in parallel carry out corresponding compensation according to the received compensation signals.
The voltage-stabilizing energy-saving and three-phase imbalance treatment energy-saving coordination control method comprises the step of compensating a basic value by using the voltage in the step S2U BThe method is determined by the collected actual effective value of the negative charge pressure and the known effective value of the rated negative charge pressure, and the calculation formula is as follows:
in the formula (I), the compound is shown in the specification,U ris an effective value of the actual negative charge voltage, UNIs the effective value of the rated negative charge voltage; u shaperObtained by collecting data, UNIs obtained according to the data of the treated load.
In addition, each phase current unbalance degree compensation basic value
、
、
The calculation formula is determined by the collected current of each phase and is as follows:
in the formula (I), the compound is shown in the specification,I avg effective value of three-phase currentThe average value of the values is calculated,I i （i= A, B, C) refers to A, B, C effective values of three-phase current,I avg =（I A+I B+I C）/3。
as shown in fig. 2, the voltage-stabilizing energy-saving and three-phase imbalance treatment energy-saving coordination control method includes the specific steps of the optimal energy-saving algorithm in S3:
s31: calculating voltage-stabilizing energy-saving powerP US：
In the formula (I), the compound is shown in the specification,k 1in order to compensate the coefficient for the voltage,U Bto compensate the base value for the voltage, INA load phase current rating;
s32: calculating three-phase unbalance treatment energy-saving powerP TS：
In the formula (I), the compound is shown in the specification,
(i= A, B, C) are compensation values of current unbalance,
(i= A, B, C) each current unbalance degree compensation basic value,k i2-（i= A, B, C) unbalance degree compensation coefficient of each phase current,I avgis the average value of the effective values of three-phase current, RLIs a line equivalent resistor;
s33: calculating electric energy feedback powerP FB：
In the formula (I), the compound is shown in the specification,P Ifor series power electronic conversion devices with a compensation factor ofk 1The regulation of the time-consuming power is power consuming,P Pfor parallel power electronic conversion devices with a compensation factor ofk i2-（iRegulation in case of = a, B, C) consumed power;
s34: calculating comprehensive energy-saving powerE：
And solving the compensation coefficientk 1Andk i2-（ioptimal configuration values of = A, B, C)k 1 'Andk i2- '（i= a, B, C) so that the power is comprehensively savedETaking the maximum value, the compensation factork 1Andk i2-（ivalue range of = A, B, C) [0, 1%]；
S35: obtaining a voltage compensation value based on the optimal configuration parameters of S34U BC=k 1 'UBAnd each phase current unbalance degree compensation value
（i=A,B,C）。
In S34, the energy-saving power is integratedEThe maximum value is obtained by setting a certain precision (e.g., 0.001) to [0,1 ]]Interval traversal { k1，k2-iThe combined value of.
The above-mentionedP IThe calculation formula of (2) is as follows:
wherein the content of the first and second substances,
to compensate for the coefficient ofk 1The effective value of the voltage at the two ends of the power electronic conversion device is connected in series,
the effective value of the current flowing through the series power electronic converter at this time,
the power factor of the series power electronic converter at this time.
The above-mentionedP P The calculation formula of (2) is as follows:
wherein the content of the first and second substances,
to compensate for the coefficient ofk 2-i(i = A, B, C) the effective value of the voltage across the parallel power electronic converter,
in this case, the effective value of the current flowing through the parallel-connected power electronic converter,
the power factor of the power electronic conversion device is connected in parallel at the moment.
The voltage-stabilizing energy-saving and three-phase imbalance treatment energy-saving coordination control method is characterized in that the power quality problem refers to that: the effective value of the load side voltage deviates from the load rated voltage and a common zero line current exists.
Based on topology of energy-saving equipment and detected voltage and current data, under the condition of simultaneous voltage fluctuation and three-phase unbalance, energy-saving benefit of power quality control and energy-saving benefit of power feedback are considered at the same time, compensation quantity of power quality problems is optimally selected through an optimal energy-saving algorithm, and optimal energy-saving coordination control is realized; on one hand, the corresponding electric energy loss is reduced by treating two electric energy quality problems of voltage fluctuation and three-phase imbalance, on the other hand, the power electronic conversion device based on the energy-saving equipment realizes power balance, and the series and parallel electric electronic conversion devices form an electric energy feedback loop, so that the energy consumption required by treating the electric energy quality is reduced, and the aim of saving energy is fulfilled.
The above is a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, modifications or equivalent substitutions of the technical solution of the present invention without inventive work may be made without departing from the scope of the present invention.
Claims (4)
1. A voltage-stabilizing energy-saving and three-phase imbalance treatment energy-saving coordination control method is characterized by being suitable for energy-saving equipment comprising a series power electronic conversion device and a parallel power electronic conversion device, and comprising the following steps of:
s1: collecting voltage data of a low-voltage side and voltage data of a load side of an input end transformer by taking T as an electric energy quality control period, and simultaneously collecting three-phase load current and common zero line current data; if the effective value of the voltage at the load side collected in the power quality control period deviates from the rated voltage of the load and a common zero line current exists, or only one power quality problem occurs, the system sends out an adjusting command and enters S2; otherwise, the system sends out an undetermined command, and the next power quality control cycle enters S1 again;
s2: the voltage deviation compensation is carried out in the series power electronic conversion device, the three-phase unbalanced current compensation is carried out in the parallel power electronic conversion device, and the voltage compensation basic value is calculated and obtained according to the voltage and current dataU BAnd each phase current unbalance degree compensation basic value
、
、
If there is only one power quality problemSetting the other compensation basic value as 0;
s3: is provided withk 1In order to compensate the coefficient for the voltage,k i2-（ithe phase current unbalance compensation coefficients are the compensation coefficients of the unbalance degrees of the phases A, B and C), the optimal compensation coefficients of the unbalance degrees of the voltages and the currents are obtained by calculation through an optimal energy-saving algorithm under the condition of comprehensively considering two factors of energy saving and electric energy feedback effects of voltage stabilization and three-phase unbalance treatment, compensation voltage control signals are sent to the series power electronic conversion devices according to obtained results, and compensation current control signals are sent to the parallel power electronic conversion devices;
s4: the power electronic conversion devices connected in series and in parallel carry out corresponding compensation according to the received compensation signals, and the energy-saving effect is achieved.
2. The voltage-stabilizing energy-saving and three-phase imbalance treatment energy-saving coordinated control method according to claim 1, wherein the voltage compensation basic value in S2 isU BThe method is determined by the collected actual effective value of the negative charge pressure and the known effective value of the rated negative charge pressure, and the calculation formula is as follows:
in the formula (I), the compound is shown in the specification,U ris an effective value of the actual negative charge voltage, UNIs the effective value of the rated negative charge voltage;
in addition, each phase current unbalance degree compensation basic value
、
、
The calculation formula is determined by the collected current of each phase and is as follows:
in the formula (I), the compound is shown in the specification,I avgthe average value of the three-phase current effective values is obtained.
3. The voltage-stabilizing energy-saving and three-phase imbalance treatment energy-saving coordination control method according to claim 1, wherein the optimal energy-saving algorithm in the step S3 comprises the following specific steps:
s31: calculating voltage-stabilizing energy-saving powerP US：
In the formula (I), the compound is shown in the specification,k 1in order to compensate the coefficient for the voltage,U Bto compensate the base value for the voltage, INA load phase current rating;
s32: calculating three-phase unbalance treatment energy-saving powerP TS：
In the formula (I), the compound is shown in the specification,
(i= A, B, C) are compensation values of current unbalance,
(i= A, B, C) each current unbalance degree compensation basic value,k i2-（i= A, B, C) unbalance degree compensation coefficient of each phase current,I avgis the average value of the effective values of three-phase current, RLIs a line equivalent resistor;
s33: calculating electric energy feedback powerP FB：
In the formula (I), the compound is shown in the specification,P Ifor series power electronic conversion devices with a compensation factor ofk 1The regulation of the time-consuming power is power consuming,P Pfor parallel power electronic conversion devices with a compensation factor ofk i2-（iRegulation in case of = a, B, C) consumed power;
s34: calculating comprehensive energy-saving powerE：
And solving the compensation coefficientk 1Andk i2-（ioptimal configuration values of = A, B, C)k 1 'Andk i2- '（i= a, B, C) so that the power is comprehensively savedETaking the maximum value, the compensation factork 1Andk i2-（ivalue range of = A, B, C) [0, 1%]；
S35: obtaining a voltage compensation value based on the optimal configuration parameters of S34U BC=k 1 'UBAnd each phase current unbalance degree compensation value
（i=A,B,C）。
4. The voltage-stabilizing energy-saving and three-phase imbalance treatment energy-saving coordination control method according to claim 1, wherein the power quality problem refers to: the effective value of the load side voltage deviates from the load rated voltage and a common zero line current exists.
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