CN111431176A - Closed-loop control method of universal power quality controller based on self-adaptive control - Google Patents
Closed-loop control method of universal power quality controller based on self-adaptive control Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
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- 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
- H02J3/12—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
- H02J3/18—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
- H02J3/26—Arrangements for eliminating or reducing asymmetry in polyphase networks
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
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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
- Y02E40/40—Arrangements for reducing harmonics
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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
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Abstract
The invention provides a closed-loop control method of a general power quality controller based on self-adaptive control, and aims to solve the technical problems that in the existing power quality control technology, the power quality control target of a single power quality controller is single, when a plurality of power quality controllers are used together, the control effect can not reach the design value, and the power quality controller aiming at the specific power quality problem can amplify other unprocessed power quality problems under certain conditions. The method comprises the steps of firstly identifying the phenomenon of power quality, then generating a weight coefficient of a multi-index adaptive objective function, obtaining the optimized reference current of the universal power quality controller through a dynamic adjustment process, updating a comparison value of a PWM generator through closed-loop control, and respectively applying driving signals to SICMOS transistors in the power quality controller through isolation amplification of a driving system to realize the adaptive closed-loop control.
Description
Technical Field
The invention belongs to the technical field of power quality control, and relates to a multi-target self-adaptive closed-loop control method for power quality.
Background
With the increasing of nonlinear, variable power, strong impact and high sensitive load in the power grid system to which the power quality controller is connected, the design of low-cost and high-performance closed-loop control of the general power quality controller with multiple power quality problem control functions becomes a great challenge. The existing power quality controllers usually only aim at specific problems, adopt a fixed power quality analysis method and combine a closed-loop control technology to form a power quality controller with special functions, such as SVG for reactive power compensation, APF for harmonic current suppression, TSC for three-phase imbalance control and DVR for voltage fluctuation control.
The power quality controller aiming at the specific power quality problem has a remarkable effect on the specific problem, but generally has no effect on other power quality problems, and in some cases, other power quality problems can be even more serious. When a plurality of power quality controllers are arranged to control corresponding power quality problems respectively, the overall cost of power quality control is high, and the size and the weight are large. In addition, between a plurality of power quality controllers, the actual performance may not reach the design value due to lack of mutual understanding. For example, harmonic remediation functions may cause increased line losses, reactive power reductions may cause overvoltage in the grid system, and remediation of three-phase imbalances may cause voltage flicker to be severe at some line ends.
Disclosure of Invention
The invention aims to provide a closed-loop control method of a universal power quality controller based on adaptive control, which aims to solve the technical problems that the power quality control target of a single power quality controller is single, when a plurality of power quality controllers are used together, the control effect can not reach the design value, and the power quality controller aiming at the specific power quality problem can amplify other unprocessed power quality problems under certain conditions in the existing power quality control technology.
The invention conception of the invention is as follows:
the method comprises the steps of firstly identifying the phenomenon of power quality, then generating a weight coefficient of a multi-index adaptive objective function, obtaining the optimized reference current of the universal power quality controller through a dynamic adjustment process, updating a comparison value of a PWM generator (10 in figure 3) through closed-loop control, and respectively applying 6 driving signals to 6 SICMOS (semiconductor integrated circuit) transistors in the power quality controller through isolation amplification of a driving system (11 in figure 3) to realize the adaptive closed-loop control.
The technical scheme adopted by the invention is as follows:
a closed-loop control method of a general power quality controller based on self-adaptive control is characterized by comprising the following steps:
the method comprises the steps that a universal power quality controller based on self-adaptive control is connected to a three-phase power grid, and an additional alternating current voltage transformer PT1 for detecting the instantaneous value of the voltage of the power grid, an alternating current transformer CT1 for detecting the instantaneous value of the alternating current of a nonlinear load, an alternating current transformer CT2 for detecting the instantaneous value of the alternating current of the universal power quality controller and a direct current voltage transformer PT2 for detecting the instantaneous value of the direct current of the universal power quality controller are connected to the three-phase power grid, wherein the universal power quality controller comprises inductors L1, L2 and L3, capacitors C1 and C2 and a converter consisting of SICsix MOS (metal oxide semiconductor) transistors A-F;
step 2, detecting electrical parameter information;
the method comprises the steps that instantaneous values of grid voltage Uab, Ubc and Uca are detected through an alternating current voltage transformer PT1, instantaneous values of alternating current of nonlinear loads ial, ibl and icl are detected through an alternating current transformer CT1, instantaneous values of alternating current of a universal power quality controller ias, ibs and ics are detected through an alternating current transformer CT2, and direct current voltages Udc1 and Udc2 of the universal power quality controller are detected through a direct current voltage transformer PT 2;
step 3, sampling electrical parameter information;
sampling and converting the grid voltage instantaneous values Uab, Ubc and Uca detected in the step 2, the alternating current instantaneous values ias, ibs and ics of the universal power quality controller, the alternating current instantaneous values ial, ibl and icl of the nonlinear load and the direct current voltages Udc1 and Udc2 of the universal power quality controller into digital quantities;
calculating actual values of the electric energy quality indexes such as harmonic distortion rate, three-phase unbalance, voltage deviation, current fluctuation, voltage fluctuation, power factor and line loss rate in real time based on the data sampled in the step 3;
generating weight coefficients of respective indexes according to the actual value of the power quality index, wherein the weight coefficients comprise a weight coefficient k _ DUabc of voltage deviation, a weight coefficient k _ dUabc of voltage fluctuation, a weight coefficient k _ sUabc of three-phase voltage unbalance, a weight coefficient k _ DIabc of three-phase current deviation, a weight coefficient k _ dIabc of three-phase current fluctuation, a weight coefficient k _ THDIabc of harmonic distortion rate, a weight coefficient k _ DPF of a power factor index and a weight coefficient k _ dP of a line loss rate;
step 6, defining a target function Iabcref which takes a given current value as a target;
the objective function Iabcref ═ k _ DUabc + k _ DUabc ═ DUabc-
+k_sUabc*sUabc+k_DIabc*DIabc
+k_dIabc*THDIabc+k_THDIabc*THDIabc
+k_DPF*DPF+k_dP*dP；
step 8, generating PWM (pulse width modulation) of a SICMOS (semiconductor integrated circuit) tube for controlling the general power quality controller;
step 10, calculating a three-phase voltage deviation DUabc by using a DSP, if the three-phase voltage deviation DUabc exceeds the standard, adjusting the three-phase voltage deviation to be a weight coefficient k _ DUabc of the DUabc, otherwise, keeping the weight coefficient k _ DUabc of the three-phase voltage deviation DUabc unchanged, and entering step 11;
step 11, calculating three-phase voltage fluctuation dUabc by using a DSP, if the three-phase voltage fluctuation dUabc exceeds the standard, adjusting a weight coefficient k _ dUabc of the three-phase voltage fluctuation dUabc, otherwise, keeping the weight coefficient k _ dUabc of the three-phase voltage fluctuation dUabc unchanged, and entering step 12;
step 13, calculating a three-phase current deviation DIabc by using a DSP, if the three-phase current deviation DIabc exceeds the standard, adjusting a weight coefficient k _ DIabc of the three-phase current deviation DIabc, otherwise, keeping the weight coefficient k _ DIabc of the three-phase current deviation DIabc unchanged, and entering step 14;
step 14, calculating three-phase current fluctuation dIabc by using a DSP (digital signal processor), if the three-phase current fluctuation dIabc exceeds the standard, adjusting a weight coefficient k _ dIabc of the three-phase current fluctuation dIabc, otherwise, keeping the weight coefficient k _ dIabc of the three-phase current fluctuation dIabc unchanged, and entering step 15;
step 15, calculating a harmonic distortion rate thdibc by using the DSP, if the harmonic distortion rate thdibc exceeds a standard, adjusting a weight coefficient k _ thdibc of the harmonic distortion rate thdibc, otherwise, keeping the weight coefficient k _ thdibc of the harmonic distortion rate thdibc unchanged, and entering step 16;
step 18, detecting direct current voltages Udc1 and Udc2 in the universal power quality controller by using a direct current voltage transformer PT2, adjusting a target function Iabcref if the direct current voltages exceed the standard, indirectly modifying given values Udc1_ ref and Udc2_ ref of the direct current voltages, and otherwise, keeping given values Udc1_ ref and Udc2_ ref of the direct current voltages unchanged, and entering step 19;
and step 19, generating PWM by using a PWM generation module of the DSP chip, driving six SICMOS transistors A-F of the universal power quality control device through an isolation amplifying circuit, and adjusting the turn-on and turn-off time of the six SICMOS MOS transistors A-F, thereby controlling the size and direction of three-phase output currents ias, ibs and ics of the universal power quality controller.
Further, the weight coefficient of each power quality index in step 5 is calculated according to the following formula:
k_DUabc＝DUabc；
k_dUabc＝dUabc；
k_sUabc＝sUabc；
k_DIabc＝DIabc；
k_dIabc＝dIabc；
k_THDIabc＝THDIabc；
k_DPF＝DPF；
k_dP＝dP。
further, step 10 specifically includes:
step 10.1, if the DUabc is greater than the national standard specified value, updating the k _ DUabc according to a formula that k _ DUabc is 1.01 × k _ DUabc, and entering step 10.4;
step 10.2, if the DUabc meets the national standard specified value and is lower than 0.5 times of the national standard specified value, updating the k _ DUabc according to a formula that k _ DUabc is 0.99 × k _ DUabc, and entering step 10.4;
step 10.3, if both 10.1 and 10.2 are not applicable, maintaining k _ DUabc unchanged, and proceeding to step 10.4;
step 10.4, keep k _ DUabc constant for a period of time, and proceed to step 11.
Further, step 11 specifically includes:
step 11.1, if the value of deubc is greater than the user specified value, updating k _ deubc according to the formula of k _ deubc being 1.01 × k _ deubc, and proceeding to step 11.4;
step 11.2, if the value of deubc satisfies the user specified value and is lower than 0.5 times of the user specified value, updating k _ deubc according to the formula of k _ deubc being 0.99 × k _ deubc, and proceeding to step 11.4;
step 11.3, if 11.1 and 11.2 are not applicable, maintaining k _ dUabc unchanged, and entering step 11.4;
step 11.4, keep k _ dUabc constant for a period of time, and proceed to step 12.
Further, step 12 specifically includes:
step 12.1, if ssuabc is greater than the national standard specified value, updating k _ ssuabc according to the formula of k _ ssuabc being 1.01 × k _ ssuabc, and entering step 12.4;
step 12.2, if ssuabc meets the national standard specified value and is lower than 0.5 times of the national standard specified value, updating k _ ssuabc according to a formula that k _ ssuabc is 0.99 × k _ ssuabc, and entering step 12.4;
step 12.3, if 12.1 and 12.2 are not applicable, maintaining k _ sUabc unchanged, and entering step 12.4;
step 12.4, keep k _ sUabc unchanged for a period of time, and proceed to step 13.
Further, step 13 specifically includes:
step 13.1, if the dibac is greater than the national standard specified value, updating k _ dibc according to the formula of k _ dibc being 1.01 × k _ dibc, and entering step 13.4;
step 13.2, if the dibac meets the national standard specified value and is lower than 0.5 times of the national standard specified value, updating k _ dibc according to the formula that k _ dibc is 0.99 × k _ dibc, and entering step 13.4;
step 13.3, if 13.1 and 13.2 are not applicable, maintaining k _ dibac unchanged, and entering step 12.4;
step 13.4, keep k _ dibac constant for a period of time, and proceed to step 14.
Further, step 14 specifically includes:
step 14.1, if the dlabc is greater than the user specified value, updating k _ dlabc according to a formula that k _ dlabc is 1.01 × k _ dlabc, and entering step 14.4;
step 14.2, if the dlabc meets the user specified value and is lower than 0.5 times of the user specified value, updating k _ dlabc according to a formula that k _ dlabc is 0.99 × k _ dlabc, and entering step 14.4;
step 14.3, if the two are not applicable, maintaining the k _ dIabc unchanged, and entering step 13.4;
step 14.4, keeping k _ dIabc unchanged for a period of time, and entering step 15.
Further, step 15 specifically includes:
step 15.1, if thdibc is greater than the user specified value, updating k _ thdibc according to the formula of k _ thdibc being 1.01 × k _ thdibc, and proceeding to step 14.4;
step 15.2, if thdibc meets the user specified value and is lower than 0.5 times of the user specified value, updating k _ thdibc according to the formula that k _ thdibc is 0.99 × k _ thdibc, and entering step 15.4;
step 15.3, if both 15.1 and 15.2 are not applicable, maintaining k _ thdibc unchanged, and entering step 15.4;
step 15.4, keep k _ thdibc constant for a period of time, go to step 16.
Further, step 16 specifically includes:
step 16.1, if the DPF is larger than the DPF corresponding to the national standard specified value PF, updating the k _ DPF according to the formula of k _ DPF being 1.01 × k _ DPF, and proceeding to step 16.4;
step 16.2, if the DPF meets the DPF corresponding to the national standard specified value PF and is lower than 0.5 times of the DPF corresponding to the national standard specified value PF, updating the k _ DPF according to a formula of k _ DPF being 0.99 × k _ DPF, and entering step 15.4;
step 16.3, if neither 16.1 nor 16.2 is applicable, maintaining the k _ DPF unchanged, and entering step 16.4;
step 16.4, keep k _ DPF constant for a period of time, go to step 17.
Further, step 17 specifically includes:
step 17.1, if dP is greater than the user specified value dP, updating k _ dP according to the formula of k _ dP being 1.01 × k _ dP, and executing step 16.4;
step 17.2, if dP satisfies the user specified value dP and is lower than 0.5 times of the user specified value dP, updating k _ dP according to the formula of k _ dP being 0.99 × k _ dP, and executing step 17.4;
step 17.3, if neither of 17.1 and 17.2 are applicable, maintaining k _ dP unchanged, and executing step 16.4;
step 17.4, keep k _ dP constant for a period of time, go to step 18.
The invention has the beneficial effects that:
the invention aims at several electric energy quality phenomena of voltage flicker, voltage sag, three-phase unbalance, reactive power and harmonic current, sets corresponding quantization indexes, adopts voltage and current mutual inductors, combines DSP technology to quickly identify the electric energy quality phenomena of voltage flicker, voltage sag, three-phase unbalance, reactive power and harmonic current, simultaneously carries out quantization analysis on the electric energy quality indexes of harmonic distortion rate, three-phase unbalance, voltage deviation, current fluctuation, voltage fluctuation, power factor, line loss rate and the like by utilizing an adaptive control strategy, reasonably sets a weight factor, forms a multi-index adaptive target function, calculates the numerical value of the multi-index adaptive target function, and carries out closed-loop control, so that a plurality of electric energy quality problems are simultaneously relieved, a plurality of indexes of electric energy quality are simultaneously optimized, and the single electric energy management problem can not cause the aggravation of other electric energy quality problems, the method and the device can simultaneously solve a plurality of problems of the power quality from the root, thereby realizing the self-adaptive control of the power quality.
Drawings
Fig. 1 is a diagram of a power grid system configuration of a universal power quality controller based on adaptive control.
Fig. 2 is a main circuit diagram of a general power quality controller based on adaptive control.
Fig. 3 is a control schematic diagram of a closed-loop control method of a general power quality controller based on adaptive control.
Fig. 4 is a control flow chart of a closed-loop control method of a general power quality controller based on adaptive control.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
The invention provides a closed-loop control method of a general power quality controller based on adaptive control, which comprises the following steps:
step 1: building hardware platform
The method comprises the following steps that a universal power quality controller based on self-adaptive control is connected to a three-phase power grid, and an additional alternating current voltage transformer PT1 for detecting the instantaneous value of the voltage of the power grid, an additional alternating current transformer CT1 for detecting the instantaneous value of the alternating current of a nonlinear load, an additional alternating current transformer CT2 for detecting the instantaneous value of the alternating current of the universal power quality controller and an additional direct current voltage transformer PT2 for detecting the instantaneous value of the direct current of the universal power quality controller are connected to the three-phase power grid;
as shown in FIG. 2, the universal power quality controller comprises inductors L1, L2, L3, capacitors C1, C2 and an inverter composed of six SICMOS transistors A-F, wherein the inductors L1, L2, L3 are respectively arranged between the middle point of three half bridges (one half bridge is composed of two SICMOS transistors, the connection point is the middle point) and a three-phase power grid, one ends of the capacitors C1, C2 are respectively connected to two sides of the half bridge of the inverter, and the other ends of the capacitors C1, C2 are connected with each other and are connected with a neutral point N of the power grid.
In correspondence with this, the number of the first and second electrodes,
the alternating current voltage transformer PT1, the alternating current transformer CT1, the alternating current transformer CT2 and the direct current voltage transformer PT2 form an isolation conditioning circuit, an A/D sampling module 17 arranged on the DSP chip 4 provides electrical parameter information necessary for adaptive control to the universal power quality controller, wherein the electrical parameter information includes instantaneous values of power grid voltage Uab, Ubc and Uca, instantaneous values of alternating current of nonlinear loads ial, ibl and icl, instantaneous values of alternating current of the universal power quality controller ias, ibs and ics, and direct voltages of the universal power quality controller Udc1 and Udc 2.
Step 2, detecting electrical parameter information
The method comprises the steps of detecting instantaneous values of grid voltage Uab, Ubc and Uca through an alternating current transformer PT1, detecting instantaneous values of alternating current of nonlinear loads ial, ibl and icl through an alternating current transformer CT1, detecting instantaneous values of alternating current of a universal power quality controller ias, ibs and ics through an alternating current transformer CT2, and detecting direct current voltages Udc1 and Udc2 of the universal power quality controller through a direct current transformer PT 2.
Step 3, sampling electrical parameter information
An A/D sampling module 17 of the DSP chip 4 samples and converts the grid voltage instantaneous values Uab, Ubc and Uca detected in the step 2, the alternating current instantaneous values ias, ibs and ics of the universal power quality controller, the alternating current instantaneous values ial, ibl and icl of the nonlinear load and the direct current voltages Udc1 and Udc2 of the universal power quality controller into digital quantities; step 4, calculating the actual value of the power quality index
Through the rapid operation of the DSP chip 4, according to the existing calculation method specified in the IEC61000-4-30 electric energy quality standard, the actual values of the electric energy quality indexes such as harmonic distortion rate, three-phase unbalance, voltage deviation, current fluctuation, voltage fluctuation, power factor and line loss rate are calculated in real time based on the data sampled in the step 3;
step 4.1, setting three-phase voltages of a power grid as ua, ub and uc, setting three-phase currents of a load as ial, ibl and icl, and setting three-phase currents of a universal power quality controller as ias, ibs and ics;
4.2, rapidly calculating through the DSP to obtain a three-phase voltage deviation DUabc;
4.3, rapidly calculating by using a DSP to obtain three-phase voltage fluctuation dUabc;
4.4, rapidly calculating through the DSP to obtain three-phase voltage unbalance degree sUabc;
step 4.5, rapidly calculating through the DSP to obtain the three-phase current deviation DIabc;
step 4.6, obtaining three-phase current fluctuation dIabc through rapid calculation of the DSP;
step 4.7, obtaining the harmonic distortion rate THDIabc through the rapid calculation of the DSP;
4.8, rapidly calculating through the DSP to obtain a power factor index as DPF;
step 4.9, obtaining the line loss rate dP through the rapid calculation of the DSP;
Generating weight coefficients of respective indexes according to the actual values of the power quality indexes, wherein the specific parameters and calculation method of the weight coefficients are shown in the step 5.1-5.8;
step 5.1, defining a weight coefficient of the voltage deviation as k _ DUabc, and calculating the k _ DUabc as DUabc;
step 5.2, defining a weight coefficient k _ dUabc of voltage fluctuation, wherein the calculation method is that k _ dUabc is equal to dUabc;
step 5.3, defining a weight coefficient k _ sUabc of the three-phase voltage unbalance, wherein the calculation method is that k _ sUabc is equal to sUabc;
step 5.4, defining a weight coefficient k _ dibc of the three-phase current deviation, wherein the calculation method is that k _ dibc is equal to dibc;
step 5.5, defining a weight coefficient k _ dIabc of three-phase current fluctuation, wherein the calculation method is that k _ dIabc is equal to dIabc;
step 5.6, defining a weight coefficient k _ thdibc of the harmonic distortion rate, wherein the calculation method is that k _ thdibc is equal to thdibc;
step 5.7, defining a weight coefficient k _ DPF of the power factor index, wherein the calculation method is that k _ DPF is changed into DPF;
step 5.8, defining a weight coefficient k _ dP of the line loss rate, and calculating the weight coefficient k _ dP as dP;
step 6, defining an electric energy quality control target function Iabcref taking a current given value as a target;
the objective function Iabcref ═ k _ DUabc + k _ DUabc ═ DUabc-
+k_sUabc*sUabc+k_DIabc*DIabc
+k_dIabc*THDIabc+k_THDIabc*THDIabc
+k_DPF*DPF+k_dP*dP
According to the output current of an alternating current transformer CT2 of the universal power quality controller and a power quality control target function Iabcref of a load, calculating to obtain a modulation wave of the three-phase converter according to a conventional modulation wave calculation method disclosed by the prior document;
step 8, generating PWM to control SICMOS tube of general electric energy quality controller
The PWM generation module 10 of the DSP is used for generating PWM, and six SICMOS tubes A-F of the universal power quality control device are respectively driven through an isolation amplifying circuit 11.
After the output current of the general power quality controller works for a period of time, the instantaneous values Uab, Ubc and Uca of the grid voltage are detected through an alternating current voltage transformer PT1, the instantaneous values ial, ibl and icl of the alternating current of the nonlinear load are detected through an alternating current transformer CT1, the instantaneous values ias, ibs and ics of the alternating current of the general power quality controller are detected through an alternating current transformer CT2, and the direct voltages Udc1 and Udc2 of the general power quality controller are detected through a direct current voltage transformer PT 2.
Step 10, calculating a three-phase voltage deviation DUabc by using a DSP, if the three-phase voltage deviation DUabc exceeds the standard, adjusting the three-phase voltage deviation to be a weight coefficient k _ DUabc of the DUabc, otherwise, keeping the weight coefficient k _ DUabc of the three-phase voltage deviation DUabc unchanged, and entering step 11;
step 10.1, if the DUabc is greater than the national standard specified value, updating the k _ DUabc according to a formula that k _ DUabc is 1.01 × k _ DUabc, and entering step 10.4;
step 10.2, if the DUabc meets the national standard specified value and is lower than 0.5 times of the national standard specified value, updating the k _ DUabc according to a formula that k _ DUabc is 0.99 × k _ DUabc, and entering step 10.4;
step 10.3, if both 10.1 and 10.2 are not applicable, maintaining k _ DUabc unchanged, and proceeding to step 10.4;
and step 10.4, keeping k _ DUabc unchanged for a period of time, observing the change conditions of other electric energy quality phenomena, and entering step 11.
Step 11, calculating three-phase voltage fluctuation dUabc by using a DSP, if the three-phase voltage fluctuation dUabc exceeds the standard, adjusting a weight coefficient k _ dUabc of the three-phase voltage fluctuation dUabc, otherwise, keeping the weight coefficient k _ dUabc of the three-phase voltage fluctuation dUabc unchanged, and entering step 12;
step 11.1, if the value of deubc is greater than the user specified value, updating k _ deubc according to the formula of k _ deubc being 1.01 × k _ deubc, and proceeding to step 11.4;
step 11.2, if the value of deubc satisfies the user specified value and is lower than 0.5 times of the user specified value, updating k _ deubc according to the formula of k _ deubc being 0.99 × k _ deubc, and proceeding to step 11.4;
step 11.3, if 11.1 and 11.2 are not applicable, maintaining k _ dUabc unchanged, and entering step 11.4;
and 11.4, keeping k _ dUabc unchanged for a period of time, observing the change conditions of other electric energy quality phenomena, and entering the step 12.
step 12.1, if ssuabc is greater than the national standard specified value, updating k _ ssuabc according to the formula of k _ ssuabc being 1.01 × k _ ssuabc, and entering step 12.4;
step 12.2, if ssuabc meets the national standard specified value and is lower than 0.5 times of the national standard specified value, updating k _ ssuabc according to a formula that k _ ssuabc is 0.99 × k _ ssuabc, and entering step 12.4;
step 12.3, if 12.1 and 12.2 are not applicable, maintaining k _ sUabc unchanged, and entering step 12.4;
and step 12.4, keeping k _ sUabc unchanged for a period of time, observing the change conditions of other electric energy quality phenomena, and entering step 13.
Step 13, calculating a three-phase current deviation DIabc by using a DSP, if the three-phase current deviation DIabc exceeds the standard, adjusting a weight coefficient k _ DIabc of the three-phase current deviation DIabc, otherwise, keeping the weight coefficient k _ DIabc of the three-phase current deviation DIabc unchanged, and entering step 14;
step 13.1, if the dibac is greater than the national standard specified value, updating k _ dibc according to the formula of k _ dibc being 1.01 × k _ dibc, and entering step 13.4;
step 13.2, if the dibac meets the national standard specified value and is lower than 0.5 times of the national standard specified value, updating k _ dibc according to the formula that k _ dibc is 0.99 × k _ dibc, and entering step 13.4;
step 13.3, if 13.1 and 13.2 are not applicable, maintaining k _ dibac unchanged, and entering step 12.4;
and step 13.4, keeping k _ DIabc unchanged for a period of time, observing the change conditions of other power quality phenomena, and entering step 14.
Step 14, calculating three-phase current fluctuation dIabc by using a DSP (digital signal processor), if the three-phase current fluctuation dIabc exceeds the standard, adjusting a weight coefficient k _ dIabc of the three-phase current fluctuation dIabc, otherwise, keeping the weight coefficient k _ dIabc of the three-phase current fluctuation dIabc unchanged, and entering step 15;
step 14.1, if the dlabc is greater than the user specified value, updating k _ dlabc according to a formula that k _ dlabc is 1.01 × k _ dlabc, and entering step 14.4;
step 14.2, if the dlabc meets the user specified value and is lower than 0.5 times of the user specified value, updating k _ dlabc according to a formula that k _ dlabc is 0.99 × k _ dlabc, and entering step 14.4;
step 14.3, if the two are not applicable, maintaining the k _ dIabc unchanged, and entering step 13.4;
and 14.4, keeping k _ dIabc unchanged for a period of time, observing the change conditions of other electric energy quality phenomena, and entering the step 15.
Step 15, calculating a harmonic distortion rate thdibc by using the DSP, if the harmonic distortion rate thdibc exceeds a standard, adjusting a weight coefficient k _ thdibc of the harmonic distortion rate thdibc, otherwise, keeping the weight coefficient k _ thdibc of the harmonic distortion rate thdibc unchanged, and entering step 16;
step 15.1, if thdibc is greater than the user specified value, updating k _ thdibc according to the formula of k _ thdibc being 1.01 × k _ thdibc, and proceeding to step 14.4;
step 15.2, if thdibc meets the user specified value and is lower than 0.5 times of the user specified value, updating k _ thdibc according to the formula that k _ thdibc is 0.99 × k _ thdibc, and entering step 15.4;
step 15.3, if both 15.1 and 15.2 are not applicable, maintaining k _ thdibc unchanged, and entering step 15.4;
and step 15.4, keeping k _ THDIabc unchanged for a period of time, and observing the change conditions of other electric energy quality phenomena.
step 16.1, if the DPF is larger than the DPF corresponding to the national standard specified value PF, updating the k _ DPF according to the formula of k _ DPF being 1.01 × k _ DPF, and proceeding to step 16.4;
step 16.2, if the DPF meets the DPF corresponding to the national standard specified value PF and is lower than 0.5 times of the DPF corresponding to the national standard specified value PF, updating the k _ DPF according to a formula of k _ DPF being 0.99 × k _ DPF, and entering step 15.4;
step 16.3, if neither 16.1 nor 16.2 is applicable, maintaining the k _ DPF unchanged, and entering step 16.4;
and step 16.4, keeping the k _ DPF unchanged for a period of time, and observing the change conditions of other electric energy quality phenomena.
step 17.1, if dP is greater than the user specified value dP, updating k _ dP according to the formula of k _ dP being 1.01 × k _ dP, and executing step 16.4;
step 17.2, if dP satisfies the user specified value dP and is lower than 0.5 times of the user specified value dP, updating k _ dP according to the formula of k _ dP being 0.99 × k _ dP, and executing step 17.4;
step 17.3, if neither of 17.1 and 17.2 are applicable, maintaining k _ dP unchanged, and executing step 16.4;
and step 17.4, keeping k _ dP unchanged for a period of time, and observing the change conditions of other power quality phenomena.
Step 18, detecting direct current voltages Udc1 and Udc2 of the universal power quality controller by using a direct current voltage transformer PT2, adjusting a target function Iabcref if the direct current voltages exceed the standard, indirectly modifying given values Udc1_ ref and Udc2_ ref of the direct current voltages, and if the direct current voltages do not exceed the standard, keeping the given values of the direct current voltages unchanged, and entering step 19;
step 18.1, if the Udc is greater than 2 × Uab, updating Udc1_ ref and Udc2_ ref according to the formula Udc _ ref 0.99, and executing step 18.4;
step 18.2, if the Udc is smaller than 1.7 × Uab, updating Udc1_ ref and Udc2_ ref according to the formula Udc _ ref 1.01, and executing step 18.4;
step 18.3, if both 18.1 and 18.2 are not applicable, maintaining Udc _ ref unchanged, and executing step 18.4;
and 18.4, keeping the Udc _ ref unchanged for a period of time, and observing the change condition of other power quality phenomena.
And step 19, generating PWM by using a PWM generation module of the DSP chip, driving six SICMOS transistors A-F of the universal power quality control device through an isolation amplifying circuit, and adjusting the turn-on and turn-off time of the six SICMOS MOS transistors A-F, thereby controlling the size and direction of three-phase output currents ias, ibs and ics of the universal power quality controller.
Claims (10)
1. A closed-loop control method of a general power quality controller based on self-adaptive control is characterized by comprising the following steps:
step 1, building a hardware platform;
the method comprises the steps that a universal power quality controller based on self-adaptive control is connected to a three-phase power grid, and an additional alternating current voltage transformer PT1 for detecting the instantaneous value of the voltage of the power grid, an alternating current transformer CT1 for detecting the instantaneous value of the alternating current of a nonlinear load, an alternating current transformer CT2 for detecting the instantaneous value of the alternating current of the universal power quality controller and a direct current voltage transformer PT2 for detecting the instantaneous value of the direct current of the universal power quality controller are connected to the three-phase power grid, wherein the universal power quality controller comprises inductors L1, L2 and L3, capacitors C1 and C2 and a converter consisting of SICsix MOS (metal oxide semiconductor) transistors A-F;
step 2, detecting electrical parameter information;
the method comprises the steps that instantaneous values of grid voltage Uab, Ubc and Uca are detected through an alternating current voltage transformer PT1, instantaneous values of alternating current of nonlinear loads ial, ibl and icl are detected through an alternating current transformer CT1, instantaneous values of alternating current of a universal power quality controller ias, ibs and ics are detected through an alternating current transformer CT2, and direct current voltages Udc1 and Udc2 of the universal power quality controller are detected through a direct current voltage transformer PT 2;
step 3, sampling electrical parameter information;
sampling and converting the grid voltage instantaneous values Uab, Ubc and Uca detected in the step 2, the alternating current instantaneous values ias, ibs and ics of the universal power quality controller, the alternating current instantaneous values ial, ibl and icl of the nonlinear load and the direct current voltages Udc1 and Udc2 of the universal power quality controller into digital quantities;
step 4, calculating an actual value of the power quality index;
calculating actual values of the electric energy quality indexes such as harmonic distortion rate, three-phase unbalance, voltage deviation, current fluctuation, voltage fluctuation, power factor and line loss rate in real time based on the data sampled in the step 3;
step 5, generating a weight coefficient of each power quality index;
generating weight coefficients of respective indexes according to the actual value of the power quality index, wherein the weight coefficients comprise a weight coefficient k _ DUabc of voltage deviation, a weight coefficient k _ dUabc of voltage fluctuation, a weight coefficient k _ sUabc of three-phase voltage unbalance, a weight coefficient k _ DIabc of three-phase current deviation, a weight coefficient k _ dIabc of three-phase current fluctuation, a weight coefficient k _ THDIabc of harmonic distortion rate, a weight coefficient k _ DPF of a power factor index and a weight coefficient k _ dP of a line loss rate;
step 6, defining a target function Iabcref which takes a given current value as a target;
the objective function Iabcref ═ k _ DUabc + k _ DUabc ═ DUabc-
+k_sUabc*sUabc+k_DIabc*DIabc
+k_dIabc*THDIabc+k_THDIabc*THDIabc
+k_DPF*DPF+k_dP*dP；
Step 7, calculating a modulation wave of the three-phase converter according to the output current of the alternating current transformer CT2 and the power quality control target function Iabcref;
step 8, generating PWM (pulse width modulation) of a SICMOS (semiconductor integrated circuit) tube for controlling the general power quality controller;
step 9, detecting the electrical parameter information again;
step 10, calculating a three-phase voltage deviation DUabc by using a DSP, if the three-phase voltage deviation DUabc exceeds the standard, adjusting the three-phase voltage deviation to be a weight coefficient k _ DUabc of the DUabc, otherwise, keeping the weight coefficient k _ DUabc of the three-phase voltage deviation DUabc unchanged, and entering step 11;
step 11, calculating three-phase voltage fluctuation dUabc by using a DSP, if the three-phase voltage fluctuation dUabc exceeds the standard, adjusting a weight coefficient k _ dUabc of the three-phase voltage fluctuation dUabc, otherwise, keeping the weight coefficient k _ dUabc of the three-phase voltage fluctuation dUabc unchanged, and entering step 12;
step 12, calculating three-phase unbalance degree sUabc by using a DSP, if the three-phase unbalance degree sUabc exceeds the standard, adjusting a weight coefficient k _ sUabc of the three-phase unbalance degree sUabc, otherwise, keeping the weight coefficient k _ sUabc of the three-phase unbalance degree sUabc unchanged, and entering step 13;
step 13, calculating a three-phase current deviation DIabc by using a DSP, if the three-phase current deviation DIabc exceeds the standard, adjusting a weight coefficient k _ DIabc of the three-phase current deviation DIabc, otherwise, keeping the weight coefficient k _ DIabc of the three-phase current deviation DIabc unchanged, and entering step 14;
step 14, calculating three-phase current fluctuation dIabc by using a DSP (digital signal processor), if the three-phase current fluctuation dIabc exceeds the standard, adjusting a weight coefficient k _ dIabc of the three-phase current fluctuation dIabc, otherwise, keeping the weight coefficient k _ dIabc of the three-phase current fluctuation dIabc unchanged, and entering step 15;
step 15, calculating a harmonic distortion rate thdibc by using the DSP, if the harmonic distortion rate thdibc exceeds a standard, adjusting a weight coefficient k _ thdibc of the harmonic distortion rate thdibc, otherwise, keeping the weight coefficient k _ thdibc of the harmonic distortion rate thdibc unchanged, and entering step 16;
step 16, calculating a power factor index DPF by using the DSP, if the power factor index DPF exceeds the standard, adjusting a weight coefficient k _ DPF of the power factor index DPF, otherwise, keeping the weight coefficient k _ DPF of the power factor index DPF unchanged, and entering step 17;
step 17, calculating the line loss rate dP by using the DSP, if the line loss rate dP exceeds the standard, adjusting the weight coefficient k _ dP of the line loss rate dP, otherwise, keeping the weight coefficient k _ dP of the harmonic line loss rate dP unchanged, and going to step 18;
step 18, detecting direct current voltages Udc1 and Udc2 in the universal power quality controller by using a direct current voltage transformer PT2, adjusting a target function Iabcref if the direct current voltages exceed the standard, indirectly modifying given values Udc1_ ref and Udc2_ ref of the direct current voltages, and otherwise, keeping given values Udc1_ ref and Udc2_ ref of the direct current voltages unchanged, and entering step 19;
and step 19, generating PWM by using a PWM generation module of the DSP chip, driving six SICMOS transistors A-F of the universal power quality control device through an isolation amplifying circuit, and adjusting the turn-on and turn-off time of the six SICMOS MOS transistors A-F, thereby controlling the size and direction of three-phase output currents ias, ibs and ics of the universal power quality controller.
2. The adaptive control-based closed-loop control method for the universal power quality controller according to claim 1, wherein the closed-loop control method comprises the following steps: and 5, calculating the weight coefficient of each power quality index according to the following formula:
k_DUabc＝DUabc；
k_dUabc＝dUabc；
k_sUabc＝sUabc；
k_DIabc＝DIabc；
k_dIabc＝dIabc；
k_THDIabc＝THDIabc；
k_DPF＝DPF；
k_dP＝dP。
3. the adaptive control-based closed-loop control method for the universal power quality controller according to claim 1, wherein the closed-loop control method comprises the following steps: the step 10 specifically comprises:
step 10.1, if the DUabc is greater than the national standard specified value, updating the k _ DUabc according to a formula that k _ DUabc is 1.01 × k _ DUabc, and entering step 10.4;
step 10.2, if the DUabc meets the national standard specified value and is lower than 0.5 times of the national standard specified value, updating the k _ DUabc according to a formula that k _ DUabc is 0.99 × k _ DUabc, and entering step 10.4;
step 10.3, if both 10.1 and 10.2 are not applicable, maintaining k _ DUabc unchanged, and proceeding to step 10.4;
step 10.4, keep k _ DUabc constant for a period of time, and proceed to step 11.
4. The adaptive control-based closed-loop control method for the universal power quality controller according to claim 1, wherein the closed-loop control method comprises the following steps: the step 11 is specifically as follows:
step 11.1, if the value of deubc is greater than the user specified value, updating k _ deubc according to the formula of k _ deubc being 1.01 × k _ deubc, and proceeding to step 11.4;
step 11.2, if the value of deubc satisfies the user specified value and is lower than 0.5 times of the user specified value, updating k _ deubc according to the formula of k _ deubc being 0.99 × k _ deubc, and proceeding to step 11.4;
step 11.3, if 11.1 and 11.2 are not applicable, maintaining k _ dUabc unchanged, and entering step 11.4;
step 11.4, keep k _ dUabc constant for a period of time, and proceed to step 12.
5. The adaptive control-based closed-loop control method for the universal power quality controller according to claim 1, wherein the closed-loop control method comprises the following steps: the step 12 specifically comprises:
step 12.1, if ssuabc is greater than the national standard specified value, updating k _ ssuabc according to the formula of k _ ssuabc being 1.01 × k _ ssuabc, and entering step 12.4;
step 12.2, if ssuabc meets the national standard specified value and is lower than 0.5 times of the national standard specified value, updating k _ ssuabc according to a formula that k _ ssuabc is 0.99 × k _ ssuabc, and entering step 12.4;
step 12.3, if 12.1 and 12.2 are not applicable, maintaining k _ sUabc unchanged, and entering step 12.4;
step 12.4, keep k _ sUabc unchanged for a period of time, and proceed to step 13.
6. The adaptive control-based closed-loop control method for the universal power quality controller according to claim 1, wherein the closed-loop control method comprises the following steps: step 13 specifically comprises:
step 13.1, if the dibac is greater than the national standard specified value, updating k _ dibc according to the formula of k _ dibc being 1.01 × k _ dibc, and entering step 13.4;
step 13.2, if the dibac meets the national standard specified value and is lower than 0.5 times of the national standard specified value, updating k _ dibc according to the formula that k _ dibc is 0.99 × k _ dibc, and entering step 13.4;
step 13.3, if 13.1 and 13.2 are not applicable, maintaining k _ dibac unchanged, and entering step 12.4;
step 13.4, keep k _ dibac constant for a period of time, and proceed to step 14.
7. The adaptive control-based closed-loop control method for the universal power quality controller according to claim 1, wherein the closed-loop control method comprises the following steps: step 14 specifically comprises:
step 14.1, if the dlabc is greater than the user specified value, updating k _ dlabc according to a formula that k _ dlabc is 1.01 × k _ dlabc, and entering step 14.4;
step 14.2, if the dlabc meets the user specified value and is lower than 0.5 times of the user specified value, updating k _ dlabc according to a formula that k _ dlabc is 0.99 × k _ dlabc, and entering step 14.4;
step 14.3, if the two are not applicable, maintaining the k _ dIabc unchanged, and entering step 13.4;
step 14.4, keeping k _ dIabc unchanged for a period of time, and entering step 15.
8. The adaptive control-based closed-loop control method for the universal power quality controller according to claim 1, wherein the closed-loop control method comprises the following steps: the step 15 specifically comprises:
step 15.1, if thdibc is greater than the user specified value, updating k _ thdibc according to the formula of k _ thdibc being 1.01 × k _ thdibc, and proceeding to step 14.4;
step 15.2, if thdibc meets the user specified value and is lower than 0.5 times of the user specified value, updating k _ thdibc according to the formula that k _ thdibc is 0.99 × k _ thdibc, and entering step 15.4;
step 15.3, if both 15.1 and 15.2 are not applicable, maintaining k _ thdibc unchanged, and entering step 15.4;
step 15.4, keep k _ thdibc constant for a period of time, go to step 16.
9. The adaptive control-based closed-loop control method for the universal power quality controller according to claim 1, wherein the closed-loop control method comprises the following steps: step 16 specifically comprises:
step 16.1, if the DPF is larger than the DPF corresponding to the national standard specified value PF, updating the k _ DPF according to the formula of k _ DPF being 1.01 × k _ DPF, and proceeding to step 16.4;
step 16.2, if the DPF meets the DPF corresponding to the national standard specified value PF and is lower than 0.5 times of the DPF corresponding to the national standard specified value PF, updating the k _ DPF according to a formula of k _ DPF being 0.99 × k _ DPF, and entering step 15.4;
step 16.3, if neither 16.1 nor 16.2 is applicable, maintaining the k _ DPF unchanged, and entering step 16.4;
step 16.4, keep k _ DPF constant for a period of time, go to step 17.
10. The adaptive control-based closed-loop control method for the universal power quality controller according to claim 1, wherein the closed-loop control method comprises the following steps: the step 17 is specifically:
step 17.1, if dP is greater than the user specified value dP, updating k _ dP according to the formula of k _ dP being 1.01 × k _ dP, and executing step 16.4;
step 17.2, if dP satisfies the user specified value dP and is lower than 0.5 times of the user specified value dP, updating k _ dP according to the formula of k _ dP being 0.99 × k _ dP, and executing step 17.4;
step 17.3, if neither of 17.1 and 17.2 are applicable, maintaining k _ dP unchanged, and executing step 16.4;
step 17.4, keep k _ dP constant for a period of time, go to step 18.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112782503A (en) * | 2020-12-24 | 2021-05-11 | 深圳供电局有限公司 | Power quality evaluation method and device, control equipment and storage medium |
| CN113852143A (en) * | 2020-06-28 | 2021-12-28 | 北京小米移动软件有限公司 | Electric energy management method and device and storage medium |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104753065A (en) * | 2015-04-16 | 2015-07-01 | 东南大学 | Important-node power quality management method in microgrid |
| CN110009184A (en) * | 2019-02-19 | 2019-07-12 | 江苏方天电力技术有限公司 | A kind of Quantitative Calculation Method of power quality weighing factor |
| CN110289619A (en) * | 2019-07-05 | 2019-09-27 | 南京工程学院 | Energy accumulation current converter compensating control method based on grid-connected electric energy quality synthesis evaluation |
-
2020
- 2020-04-17 CN CN202010307288.2A patent/CN111431176B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104753065A (en) * | 2015-04-16 | 2015-07-01 | 东南大学 | Important-node power quality management method in microgrid |
| CN110009184A (en) * | 2019-02-19 | 2019-07-12 | 江苏方天电力技术有限公司 | A kind of Quantitative Calculation Method of power quality weighing factor |
| CN110289619A (en) * | 2019-07-05 | 2019-09-27 | 南京工程学院 | Energy accumulation current converter compensating control method based on grid-connected electric energy quality synthesis evaluation |
Non-Patent Citations (1)
| Title |
|---|
| TABIB YOSEFI等: "Probabilistic Power Quality Indices for an Electric Grid with Wind Energy Conversion System and STATCOM", 《25TH IRANIAN CONFERENCE ON ELECTRICAL ENGINEERING (ICEE2017)》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113852143A (en) * | 2020-06-28 | 2021-12-28 | 北京小米移动软件有限公司 | Electric energy management method and device and storage medium |
| CN112782503A (en) * | 2020-12-24 | 2021-05-11 | 深圳供电局有限公司 | Power quality evaluation method and device, control equipment and storage medium |
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