CN110912142A - Fuzzy membership degree method applied to contactless voltage stabilizing device - Google Patents

Fuzzy membership degree method applied to contactless voltage stabilizing device Download PDF

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CN110912142A
CN110912142A CN201911027734.8A CN201911027734A CN110912142A CN 110912142 A CN110912142 A CN 110912142A CN 201911027734 A CN201911027734 A CN 201911027734A CN 110912142 A CN110912142 A CN 110912142A
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voltage
contactless
stabilizing device
input voltage
switching signal
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李峻宇
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Wuhan Tianfuhai Technology Development Co Ltd
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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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Abstract

The invention provides a fuzzy membership method applied to a contactless voltage stabilizing device, which specifically comprises the following steps: establishing a control strategy of the non-contact voltage stabilizing device according to the structure of the non-contact voltage stabilizing device; designing a control system according to the control strategy to obtain the relation between the primary input voltage and a switching signal; optimizing the relation between the preliminary input voltage and the switching signal by using a fuzzy membership algorithm to obtain the accurate relation between the input voltage and the switching signal; and automatically switching the control system according to the relation between the accurate input power supply and the switching signal to finish the automatic voltage stabilization work of the contactless voltage stabilization device. The invention has the beneficial effects that: under the condition of not changing the structure of the device and related devices, from the angle of the switching rule of the contactless voltage stabilizing device, the fuzzy membership algorithm is adopted to optimize the switching rule, so that the voltage stabilizing effect and the reliability of the device are improved.

Description

Fuzzy membership degree method applied to contactless voltage stabilizing device
Technical Field
The invention relates to the field of power systems, in particular to a fuzzy membership degree method applied to a contactless voltage stabilizing device.
Background
At present, most of the designs of contactless compensation type alternating current voltage regulators are only optimized on the structures and devices of the voltage regulators, such as the optimization of alternating current switching devices and structures and the optimization of isolation measures of a power grid and a compensation circuit. The switching rules of the switching system are also only listed in part in relation to the switching system design based on the device input-output voltage state and the ability to compensate for the voltage. Such consideration can improve the voltage stabilization effect and reliability of the device, but the optimization thereof is often accompanied by an increase in cost, and the voltage control accuracy is still unsatisfactory.
Disclosure of Invention
The invention provides a fuzzy membership method applied to a non-contact voltage stabilizing device for solving the defects in the prior art, which analyzes the structure and the working principle of a certain non-contact compensation type alternating current voltage stabilizer, deduces a switching rule from the structure and the working principle, and optimizes the switching rule by utilizing a fuzzy membership function.
The invention adopts a fuzzy membership degree method applied to a contactless voltage stabilizing device, which specifically comprises the following steps:
s101: according to the structure of the contactless voltage stabilizing device, a control strategy of the contactless voltage stabilizing device is formulated;
s102: designing a contactless voltage stabilizing device control switching system according to the control strategy to obtain a primary input voltage uINThe relationship with the switching signal σ;
s103: optimizing the preliminary input voltage u using a fuzzy membership algorithmINIn relation to the switching signal sigma to obtain an accurate input voltage uINThe relationship with the switching signal σ;
s104: according to the precise input voltage uINAnd the relation with the switching signal sigma, and an automatic switching control system, so as to finish the automatic voltage stabilization work of the contactless voltage stabilizer.
Further, the contactless voltage stabilizer structure specifically includes: three-phase voltage regulator EA、EB、EC(ii) a In which each phase is formed by three regulating transformers T of different transformation ratios1、T2、T3And each phase of the thyristor assembly THSCR1、THSCR2、THSCR3Master switch K of the deviceSBypass switch KBPThe high-voltage side fuse FU of the voltage regulating transformer and the device monitoring system; the thyristor assembly THSCR1、THSCR2And THSCR3Are all anti-parallel thyristors TH1、TH2、TH3、TH4RC absorption module RC of each anti-parallel thyristor1、RC2、RC3、RC4Composed H-bridge, high-voltage side short-circuit thyristor THSRC absorption moduleSAnd short circuit power resistor RSAnd (4) forming.
Further, in step S101, the control strategy specifically includes: the contactless voltage stabilizer detects the input voltage and the output voltage in the whole course, and when the input voltage u isINWhen the voltage is within the working range of voltage regulation and stabilization of 0.6 pu-0.95 pu or 1.05 pu-1.4 pu, the contactless voltage stabilizer starts to regulate the voltage; pu is rated value U of output voltage of the contactless voltage stabilizerNThe reference value is that the rated value of the output voltage of the contactless voltage stabilizing device is 1 pu.
Further, the contactless voltage stabilizer controls a switching system according to the input voltage uINDetermining the energy-taking position of the compensation loop of the contactless voltage stabilizing device, and then determining an energy-taking position capable of outputting the voltage u through table look-upLCompensating to the compensation rate within the allowable output voltage range of 0.95 pu-1.05 pu, and then controlling the contactless voltage stabilizer.
Further, in step S104, the input voltage u is determined according to the precise input voltage uINAnd the relation between the switching signal sigma to complete the automatic voltage stabilization work of the contactless voltage stabilization device, which specifically comprises the following steps: according to input voltage uINObtaining a switching signal sigma; then adjusting corresponding switch action or corresponding anti-parallel thyristor switching according to the switching signal sigma, thereby changing the energy taking position and the compensation rate of the compensation loop of the contactless voltage stabilizing device; energy taking position of compensation loop of contactless voltage stabilizer and closing device main switch KSThen through the bypass switch KBPControl is carried out when the input voltage u isINWhen the allowable output voltage range is 0.95 pu-1.05 pu, the bypass switch KBPThe compensation circuit of the contactless voltage stabilizing device takes energy from the input end when the voltage stabilizing device does not act; when the input voltage u isINWhen the voltage is not in the range of 0.95pu to 1.05pu, but in the range of 0.6pu to 0.95pu or 1.05pu to 1.4pu, the bypass switch K is set to be the first bypass switchBPActing, i.e. said contactless stabilityThe voltage device takes energy from the output end; when the input voltage u isINThat is, not in the range of 0.95pu to 1.05pu, or not in the range of 0.6pu to 0.95pu or 1.05pu to 1.4pu, the contactless voltage regulator is in a failure mode, and the bypass switch K is in a non-contact stateBPNon-operating, cut-off device main switch KSThe contactless voltage stabilizer does not work; the compensation rate is switched by adjusting an anti-parallel thyristor of the contactless voltage stabilizer, so that the compensation rate is changed.
Further, the bypass switch KBPThe compensation circuit is composed of two groups of switches, wherein one group of switches is a normally open switch and is connected with the compensation circuit, and the other group of switches is a normally closed switch and is directly connected with the output end; the bypass switch KBPThe action means that the normally open switch is closed and the normally closed switch is opened.
Further, the expression of the control switching system is shown in formula (1):
y(x)＝ασ(x)x (1)
in the formula (1), y epsilon R is the output quantity of the system, namely the output voltage u of the contactless voltage stabilizing deviceL(ii) a x epsilon R is input quantity of the system, namely input voltage u of the contactless voltage stabilizing deviceIN(ii) a σ (x) is ∈ R {1,2,3.. 27} is based on the input voltage uINA change of sigma (x) represents a change of the compensation scheme of the contactless voltage stabilizer controlled by the control switching system and also represents a change of the compensation rate αiThe system parameter of the ith subsystem is the ratio of the output voltage to the input voltage under the ith compensation scheme; when the input voltage uIN<0.95pu, bypass switch KBPAnd (3) acting, taking energy from the output end of a compensation loop of the contactless voltage stabilizing device, and performing positive compensation, wherein the formula (2) is as follows:
Figure BDA0002249171130000031
when the input voltage uIN<1.05pu, bypass switch KBPAnd (3) not acting, taking energy from the input end by a compensation loop of the contactless voltage stabilizing device, and carrying out negative compensation, wherein the formula is as shown in formula (3):
Figure BDA0002249171130000032
in the formulas (2) and (3), X is the total compensation rate of the compensation loop of the contactless voltage stabilizer and is a preset value, and the value of X is determined according to the voltage regulating transformer T1、T2、T3Respectively determining different transformation ratios; for the ith subsystem, its input voltage minimum uINminAnd the maximum value u of the input voltageINmaxIs represented by the formula (4):
Figure BDA0002249171130000033
the preliminary input voltage u can be calculated by the formula (4)INAnd the switching signal sigma.
The precise input voltage u is obtained in step S103INMembership function mu for the relationship with the switching signal sigmaZσ(x) X is the input voltage uIN：
When the switching signal σ is 1, the exact input voltage uINThe relationship with the switching signal σ is as follows (5):
Figure BDA0002249171130000041
in the formula (5), the reaction mixture is,
Figure BDA0002249171130000042
uIN1min、uIN2maxare preset values according to the concept of fuzzy membership;
when switching signal 1<σ<At 27 deg.C, the precise input voltage uINThe relationship with the switching signal σ is shown in equation (6):
Figure BDA0002249171130000043
in the formula (6), the reaction mixture is,
Figure BDA0002249171130000044
uINσmin、uINσmaxare preset values according to the concept of fuzzy membership;
when the switching signal σ is 27, the precise input voltage uINThe relationship with the switching signal σ is shown in equation (7):
Figure BDA0002249171130000045
in the formula (7), the reaction mixture is,
Figure BDA0002249171130000046
uIN26min、uIN27max、uIN27minare preset values according to the concept of fuzzy membership;
the selection of the switching signal σ is shown as formula (8):
σ(x)＝argσmax(μZσ(x-)) (8)
in the formula (8), x-Indicating the value taken by x to the left limit.
The technical scheme provided by the invention has the beneficial effects that: under the condition of not changing the structure of the device and related devices, from the angle of the switching rule of the contactless voltage stabilizing device, the fuzzy membership algorithm is adopted to optimize the switching rule, so that the voltage stabilizing effect and the reliability of the device are improved.
Drawings
FIG. 1 is a flow chart of a fuzzy membership method applied to a contactless voltage stabilizer according to an embodiment of the present invention;
FIG. 2 is a topological structure diagram of a contactless voltage stabilizer applied to a fuzzy membership method of the contactless voltage stabilizer according to an embodiment of the present invention;
FIG. 3 shows an embodiment of the present invention, in which the switching signal σ is based on the input voltage uINA value map of (1);
FIG. 4 is a topological structure diagram of a single-phase simulation model applied to a fuzzy membership method of a contactless voltage stabilizer according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of an effective value of a single-phase simulation voltage applied to a fuzzy membership method of a contactless voltage stabilizer according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other. The present invention will be described in further detail with reference to specific embodiments.
Referring to fig. 1, fig. 1 is a flowchart of a fuzzy membership method applied to a contactless voltage stabilizer according to an embodiment of the present invention. A fuzzy membership method applied to a contactless voltage stabilizing device specifically comprises the following steps:
s101: according to the structure of the contactless voltage stabilizing device, a control strategy of the contactless voltage stabilizing device is formulated;
s102: designing a contactless voltage stabilizing device control switching system according to the control strategy to obtain a primary input voltage uINThe relationship with the switching signal σ;
s103: optimizing the preliminary input voltage u using a fuzzy membership algorithmINIn relation to the switching signal sigma to obtain an accurate input voltage uINThe relationship with the switching signal σ;
s104: according to the precise input voltage uINAnd the relation with the switching signal sigma, and an automatic switching control system, so as to finish the automatic voltage stabilization work of the contactless voltage stabilizer.
Referring to fig. 2, fig. 2 is a topology structure diagram of a contactless voltage stabilizer applied to a fuzzy membership method of the contactless voltage stabilizer according to an embodiment of the present invention. The contactless voltage stabilizing device specifically comprises: three-phase voltage regulator EA、EB、EC(ii) a Wherein each phase is composed ofThree regulating transformer T with different transformation ratio1、T2、T3And each phase of the thyristor assembly THSCR1、THSCR2、THSCR3Master switch K of the deviceSBypass switch KBPThe high-voltage side fuse FU of the voltage regulating transformer and the device monitoring system; the thyristor assembly THSCR1、THSCR2And THSCR3Are all anti-parallel thyristors TH1、TH2、TH3、TH4RC absorption module RC of each anti-parallel thyristor1、RC2、RC3、RC4Composed H-bridge, high-voltage side short-circuit thyristor THSRC absorption moduleSAnd short circuit power resistor RSAnd (4) forming.
In step S101, the control strategy specifically includes: the contactless voltage stabilizer detects the input voltage and the output voltage in the whole course, and when the input voltage u isINWhen the voltage is within the working range of voltage regulation and stabilization of 0.6 pu-0.95 pu or 1.05 pu-1.4 pu, the contactless voltage stabilizer starts to regulate the voltage;
the expression of the control switching system is shown as the formula (1):
y(x)＝ασ(x)x (1)
in the formula (1), y epsilon R is the output quantity of the system, namely the output voltage u of the contactless voltage stabilizing deviceL(ii) a x epsilon R is input quantity of the system, namely input voltage u of the contactless voltage stabilizing deviceIN(ii) a σ (x) is ∈ R {1,2,3.. 27} is based on the input voltage uINThe change of sigma (x) represents the change of the compensation scheme of the contactless voltage stabilizer controlled by the control switching system and also represents the change of the compensation rate, αiThe system parameter of the ith subsystem is the ratio of the output voltage to the input voltage under the ith compensation scheme;
the contactless voltage stabilizer controls the switching system according to the input voltage uINDetermining the energy-taking position of the compensation loop of the contactless voltage stabilizing device, and then determining an energy-taking position capable of outputting the voltage u through table look-upLCompensating to the compensation rate within the allowable output voltage range of 0.95 pu-1.05 pu, and then controlling the contactless voltage stabilizer.
In step S104, the input voltage u is determined according to the input voltageINAnd the relation between the switching signal sigma to complete the automatic voltage stabilization work of the contactless voltage stabilization device, which specifically comprises the following steps: according to input voltage uINObtaining a switching signal sigma; then adjusting corresponding switch action or corresponding anti-parallel thyristor switching according to the switching signal sigma, thereby changing the energy taking position and the compensation rate of the compensation loop of the contactless voltage stabilizing device; energy taking position of compensation loop of contactless voltage stabilizer and closing device main switch KSThen through the bypass switch KBPControl is carried out when the input voltage u isINWhen the allowable output voltage range is 0.95 pu-1.05 pu, the bypass switch KBPThe compensation circuit of the contactless voltage stabilizing device takes energy from the input end when the voltage stabilizing device does not act; when the input voltage u isINWhen the voltage is not in the range of 0.95pu to 1.05pu, but in the range of 0.6pu to 0.95pu or 1.05pu to 1.4pu, the bypass switch K is set to be the first bypass switchBPThe action is that the contactless voltage stabilizer gets energy from the output end; when the input voltage u isINThat is, if the voltage is not in the range of 0.95pu to 1.05pu and is not in the range of 0.6pu to 0.95pu or 1.05pu to 1.4pu, the contactless voltage regulator is in the failure mode, and the bypass switch K is turned onBPNon-operating, cut-off device main switch KSThe contactless voltage stabilizer does not work; the compensation rate is switched by adjusting an anti-parallel thyristor of the contactless voltage stabilizer, so that the compensation rate is changed.
The bypass switch KBPThe compensation circuit is composed of two groups of switches, wherein one group of switches is a normally open switch and is connected with the compensation circuit, and the other group of switches is a normally closed switch and is directly connected with the output end; the bypass switch KBPThe action means that the normally open switch is closed and the normally closed switch is opened.
With device output voltage rating UNSetting the rated working voltage of the device as 1pu as a reference value, wherein the known working range is 0.6 pu-1.4 pu, the output voltage allowable range is 0.95 pu-1.05 pu, and the transformation ratios of the three compensation transformers are sequentially from small to large0.015, 0.045, 0.135. The value of the total compensation rate X is known from the transformation ratio of the compensation transformer, as shown in table 1.
TABLE 1 table of values taken for the total compensation rate
Figure BDA0002249171130000081
When the input voltage uIN<0.95pu, bypass switch KBPAnd (3) acting, taking energy from the output end of a compensation loop of the contactless voltage stabilizing device, and performing positive compensation, wherein the formula (2) is as follows:
Figure BDA0002249171130000082
when the input voltage uIN<1.05pu, bypass switch KBPAnd (3) not acting, taking energy from the input end by a compensation loop of the contactless voltage stabilizing device, and carrying out negative compensation, wherein the formula is as shown in formula (3):
Figure BDA0002249171130000083
in the formulas (2) and (3), X is the total compensation rate of the compensation loop of the contactless voltage stabilizer, is the preset value in the table 1, and the value thereof is taken according to the regulating transformer T1、T2、T3Respectively determining different transformation ratios;
α is obtained from expressions (2) and (3) and table 1iAll values are summarized in table 2.
TABLE 2 αiAll value-taking tables
Figure BDA0002249171130000084
Figure BDA0002249171130000091
The device requires the output voltage u of the systemLStabilize to the allowable output range UNAnd the inner part is as follows: 0.95UN≤uL<1.05UN；
Substituting into this switching system, there are:
Figure BDA0002249171130000092
then, for the ith subsystem, its input voltage minimum uINminAnd the maximum value u of the input voltageINmaxIs represented by the formula (4):
Figure BDA0002249171130000101
the preliminary input voltage u can be calculated by the formula (4)INAnd the switching signal sigma as described in table 3.
TABLE 3 preliminary handover signal value-taking table
Figure BDA0002249171130000102
Figure BDA0002249171130000111
Imitating the concept of membership degree of fuzzy set, another theoretical domain psi ═ 0.6,1.4]Using ZσRespectively representing 27 fuzzy sets 'switching signals to be selected under the current condition', specifying the values of the switching signals to refer to the value taking table 3, and taking the best compensation effect in each area, i.e. the system can output u with the value of 1puIN(note u)IN) Is a center in which uINThe following relationships exist:
Figure BDA0002249171130000112
the precise input voltage u is obtained in step S103INMembership function mu for the relationship with the switching signal sigmaZσ(x) X is the input voltage uIN：
When the switching signal σ is 1, the exact input voltage uINThe relationship with the switching signal σ is as follows (5):
Figure BDA0002249171130000113
in the formula (5), the reaction mixture is,
Figure BDA0002249171130000114
uIN1min、uIN2maxare preset values according to the concept of fuzzy membership;
when switching signal 1<σ<At 27 deg.C, the precise input voltage uINThe relationship with the switching signal σ is shown in equation (6):
Figure BDA0002249171130000121
in the formula (6), the reaction mixture is,
Figure BDA0002249171130000122
uINσmin、uINσmaxare preset values according to the concept of fuzzy membership;
when the switching signal σ is 27, the precise input voltage uINThe relationship with the switching signal σ is shown in equation (7):
Figure BDA0002249171130000123
in the formula (7), the reaction mixture is,
Figure BDA0002249171130000124
uIN26min、uIN27max、uIN27minare preset values according to the concept of fuzzy membership; the selection of the switching signal σ is shown as formula (8):
σ(x)＝argσmax(μZσ(x-)) (8)
in the formula (8), x-The value obtained by taking the left limit of x is expressed, and the input voltage u is accurate through a fuzzy membership algorithmINThe relationship with the switching signal σ is shown in table 4 and fig. 3.
TABLE 4 input Voltage uINTable of relations with switching signal sigma
Figure BDA0002249171130000125
Figure BDA0002249171130000131
On the basis, the invention designs a practical simulation experiment, and in the process, the whole voltage stabilizing device is in a voltage adjustable range, namely the input voltage uINIn [0.6,1.4 ]]Please refer to fig. 4, fig. 4 is a topological structure of the single-phase simulation model. The topology connects the single-phase voltage regulator ES in series between the AC power supply AC and the load resistor RLIn the meantime, the voltage regulating and stabilizing performance of the device during single-phase operation is tested by using an alternating current power supply AC linearly increased from 0.6pu to 1.4pu as the input of the single-phase voltage regulating device ES. A bypass and a bypass switch are eliminated in the topology, so that the voltage regulating loop continuously performs voltage regulating and stabilizing work. In order to study the load condition of the device during operation, current sensors CT1, CT2, CT3 and CT4 are provided in the main circuit and the thyristor circuit, respectively. An input voltage sensor PTIN is arranged at two ends of an AC power supply AC, and a load resistor R is arranged atLAn output voltage sensor PTOUT is provided at both ends, and the measured values of the two voltage sensors are output to the control unit CU. And then the control unit CU sends trigger pulses to the corresponding anti-parallel thyristor modules according to the input and output voltages and the control strategy researched in this section, and controls the switching of all 15 anti-parallel thyristor modules. And observing the conditions of input and output voltage and current of each part in the whole process.
The simulation process parameter set is shown in table 5, where the power supply was chosen as a variable ac power supply, setting a linear ramp up from 132Vrms to 308Vrms within the power supply 8 s. The reference value is set to 220Vrms, so that the output voltage U is allowedNShould range from 209Vrms to 231 Vrms.
The relationship between the switching condition of the triac module and the switching signal sigma is gathered in a table A1 and provided for table lookup in software programming.
TABLE 5 simulation Process parameters
Figure BDA0002249171130000141
Referring to fig. 5, the simulation result is shown in fig. 5, when the input voltage rises to about 177Vrms, the output voltage reaches 220Vrms, and is stabilized within the range of 217.8Vrms to 221.2Vrms before the input voltage rises to 276Vrms, the voltage stabilization range reaches-1% to 0.5%, and the preset voltage stabilization range-5% to 5% is reduced by 5 to 10 times.
Table a1 relationship between switching condition of triac module and switching signal σ
Figure BDA0002249171130000142
Figure BDA0002249171130000151
The technical scheme provided by the invention has the beneficial effects that: under the condition of not changing the structure of the device and related devices, from the angle of the switching rule of the contactless voltage stabilizing device, the fuzzy membership algorithm is adopted to optimize the switching rule, so that the voltage stabilizing effect and the reliability of the device are improved.
In this patent, the directional terms front, rear, upper and lower, etc. are used to define the positions of the devices in the drawings and the positions of the devices relative to each other, and are used for clarity and convenience of technical solution. It is to be understood that the use of the directional terms should not be taken to limit the scope of the claims.
The features of the above-described embodiments and examples of this patent may be combined with each other without conflict.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims (8)

1. A fuzzy membership degree method applied to a contactless voltage stabilizing device is characterized in that: the method specifically comprises the following steps:
s101: according to the structure of the contactless voltage stabilizing device, a control strategy of the contactless voltage stabilizing device is formulated;
s102: designing a contactless voltage stabilizing device control switching system according to the control strategy to obtain a primary input voltage uINThe relationship with the switching signal σ;
s103: optimizing the initial input voltage u by means of a fuzzy membership algorithmINIn relation to the switching signal sigma to obtain an accurate input voltage uINThe relationship with the switching signal σ;
s104: according to the precise input voltage uINAnd the relation between the switching signal sigma to complete the automatic voltage stabilization work of the contactless voltage stabilization device.
2. The fuzzy membership method applied to the contactless voltage stabilizing device according to claim 1, characterized in that: the contactless voltage stabilizing device specifically comprises: three-phase voltage regulator EA、EB、EC(ii) a In which each phase is formed by three regulating transformers T of different transformation ratios1、T2、T3And each phase of the thyristor assembly THSCR1、THSCR2、THSCR3Master switch K of the deviceSBypass switch KBPThe high-voltage side fuse FU of the voltage regulating transformer and the device monitoring system; the thyristor assembly THSCR1、THSCR2And THSCR3Are all anti-parallel thyristors TH1、TH2、TH3、TH4RC absorption module RC of each anti-parallel thyristor1、RC2、RC3、RC4Composed H-bridge, high-voltage side short-circuit thyristor THSRC absorption moduleSAnd short circuit power resistor RSAnd (4) forming.
3. The fuzzy membership degree method applied to the contactless voltage stabilizing device according to claim 1The method is characterized in that: the control strategy in step S101 specifically includes: the contactless voltage stabilizer is used for completely adjusting the input voltage uINAnd an output voltage uLDetecting when the input voltage u isINWhen the voltage is within the working range of voltage regulation and stabilization of 0.6 pu-0.95 pu or 1.05 pu-1.4 pu, the contactless voltage stabilizer starts to regulate the voltage; pu is rated value U of output voltage of the contactless voltage stabilizerNThe reference value is that the rated value of the output voltage of the contactless voltage stabilizing device is 1 pu.
4. The fuzzy membership method applied to the contactless voltage stabilizing device according to claim 2, characterized in that: the contactless voltage stabilizer controls the switching system according to the input voltage uINDetermining the energy-taking position of the compensation loop of the contactless voltage stabilizing device, and then determining an energy-taking position capable of outputting the voltage u through table look-upLCompensating to the compensation rate within the allowable output voltage range of 0.95 pu-1.05 pu, and then controlling the contactless voltage stabilizer.
5. The fuzzy membership method applied to the contactless voltage stabilizing device according to claim 4, characterized in that: in step S104, the input voltage u is determined according to the input voltageINAnd the relation between the switching signal sigma to complete the automatic voltage stabilization work of the contactless voltage stabilization device, which specifically comprises the following steps: according to input voltage uINObtaining a switching signal sigma; then according to the switching signal sigma, adjusting corresponding switch action or corresponding anti-parallel thyristor switching, thereby changing the energy taking position and the compensation rate of the compensation loop of the contactless voltage stabilizing device; energy taking position of compensation loop of contactless voltage stabilizer and closing device main switch KSThen through the bypass switch KBPControl is carried out when the input voltage u isINWhen the allowable output voltage range is 0.95 pu-1.05 pu, the bypass switch KBPThe compensation circuit of the contactless voltage stabilizing device takes energy from the input end when the voltage stabilizing device does not act; when the input voltage u isINIs not in the range of 0.95 pu-1.05 pu, but is in the range of 0.6pu ℃ &0.95pu or 1.05 pu-1.4 pu, then the bypass switch KBPThe action is that the contactless voltage stabilizer gets energy from the output end; when the input voltage u isINThat is, if the voltage is not in the range of 0.95pu to 1.05pu and is not in the range of 0.6pu to 0.95pu or 1.05pu to 1.4pu, the contactless voltage regulator is in the failure mode, and the bypass switch K is turned onBPNon-operating, cut-off device main switch KSThe contactless voltage stabilizer does not work; the compensation rate is switched by adjusting an anti-parallel thyristor of the contactless voltage stabilizer, so that the compensation rate is changed.
6. The fuzzy membership method applied to the contactless voltage stabilizing device according to claim 5, characterized in that: the bypass switch KBPThe compensation circuit is composed of two groups of switches, wherein one group of switches is a normally open switch and is connected with the compensation circuit, and the other group of switches is a normally closed switch and is directly connected with the output end; the bypass switch KBPThe action means that the normally open switch is closed and the normally closed switch is opened.
7. The fuzzy membership method applied to the contactless voltage stabilizing device according to claim 2, characterized in that: the expression of the control switching system is shown as the formula (1):
y(x)＝ασ(x)x (1)
in the formula (1), y epsilon R is the output quantity of the system, namely the output voltage u of the contactless voltage stabilizing deviceL(ii) a x belongs to R as the input quantity of the system and the input voltage u of the contactless voltage stabilizerIN(ii) a σ (x) is ∈ R {1,2,3.. 27} is based on the input voltage uINHas a total of 27 switching states, a change of sigma (x) represents a change of the compensation scheme of the contactless voltage stabilizer controlled by the control switching system and also represents a change of the compensation rate, αiThe system parameter of the ith subsystem is the ratio of the output voltage to the input voltage under the ith compensation scheme; when the input voltage uIN<0.95pu, bypass switch KBPAnd (3) acting, taking energy from the output end of a compensation loop of the contactless voltage stabilizing device, and performing positive compensation, wherein the formula (2) is as follows:
Figure FDA0002249171120000031
when the input voltage uIN<1.05pu, bypass switch KBPAnd (3) not acting, taking energy from the input end by a compensation loop of the contactless voltage stabilizing device, and carrying out negative compensation, wherein the formula is as shown in formula (3):
Figure FDA0002249171120000032
in the formulas (2) and (3), X is the total compensation rate of the compensation loop of the contactless voltage stabilizer and is a preset value, and the value of X is determined according to 27 switching states of the contactless voltage stabilizer; for the ith subsystem, its input voltage minimum uINminAnd the maximum value u of the input voltageINmaxIs represented by the formula (4):
Figure FDA0002249171120000033
the preliminary input voltage u can be calculated by the formula (4)INAnd the switching signal sigma.
8. The fuzzy membership method applied to the contactless voltage stabilizing device according to claim 1, characterized in that: the precise input voltage u is obtained in step S103INMembership function mu for the relationship with the switching signal sigmaZσ(x) X is the input voltage uIN：
When the switching signal σ is 1, the exact input voltage uINThe relationship with the switching signal σ is as follows (5):
Figure FDA0002249171120000041
in the formula (5), the reaction mixture is,
Figure FDA0002249171120000042
uIN1min、uIN2maxare preset values according to the concept of fuzzy membership;
when switching signal 1<σ<At 27 deg.C, the precise input voltage uINThe relationship with the switching signal σ is shown in equation (6):
Figure FDA0002249171120000043
in the formula (6), the reaction mixture is,
Figure FDA0002249171120000044
uINσmin、uINσmaxare preset values according to the concept of fuzzy membership;
when the switching signal σ is 27, the precise input voltage uINThe relationship with the switching signal σ is shown in equation (7):
Figure FDA0002249171120000045
in the formula (7), the reaction mixture is,
Figure FDA0002249171120000046
uIN26min、uIN27max、uIN27minare preset values according to the concept of fuzzy membership; the selection of the switching signal σ is shown as formula (8):
σ(x)＝argσmax(μZσ(x-)) (8)
in the formula (8), x-Indicating the value taken by x to the left limit.
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111884204A (en) * 2020-06-12 2020-11-03 武汉天富海科技发展有限公司 Phase selection switching control method of non-contact regulation voltage stabilizing device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111884204A (en) * 2020-06-12 2020-11-03 武汉天富海科技发展有限公司 Phase selection switching control method of non-contact regulation voltage stabilizing device

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