CN116742661A - Three-phase unbalance treatment device based on three-sagging control - Google Patents
Three-phase unbalance treatment device based on three-sagging control Download PDFInfo
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/26—Arrangements for eliminating or reducing asymmetry in polyphase networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M7/2173—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only in a biphase or polyphase circuit arrangement
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M7/219—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only in a bridge configuration
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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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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention relates to the field of three-phase unbalance management of a power distribution network, in particular to a three-phase unbalance management device based on three-sagging control, which solves the problem of unbalanced voltage and three-phase of a load parallel network caused by unbalanced alternating current load in the power distribution network. The device is topologically formed by connecting a three-phase voltage type PWM bridge rectifier with a direct current load, adopts three independent droop control on a control strategy, triggers the three-phase voltage type PWM bridge rectifier by combining a voltage and current double closed loop control strategy, and independently controls each phase of power transmitted by the three-phase rectifier within the bearable range of the rectifier, so that the voltage unbalance degree of an alternating current load grid-connected point is reduced, and the three-phase unbalance of an unbalanced distribution network is treated. The invention relates to a three-phase unbalance treatment device based on three-sagging control, which has good practicability.
Description
Technical Field
The invention relates to the field of three-phase unbalance management of power distribution networks, in particular to a three-phase unbalance management device based on three-sagging control.
Background
At present, because of more single-phase charging piles in urban areas, the single-phase charging piles can be basically and evenly distributed on a three-phase power supply in the initial installation, but because pile points selected by charging customers are random, the single-phase charging piles cannot be evenly distributed on the three-phase power supply, and the three-phase unbalance of a distribution area is serious. With the charging peak, the phenomena of high voltage phase by phase, low voltage phase by phase and serious voltage deviation occur. And finally, the voltage protection locking of the charging pile is caused, and the charging pile cannot work normally.
Three-phase imbalance-based remediation methods can be divided into three categories:
1) Phase-to-phase capacitance compensation: the inter-phase capacitance compensation means that a certain number of single-phase power capacitors are used in a compensation device, and the input quantity of each phase of capacitors is calculated and controlled respectively by detecting three-phase current to achieve the purpose of compensation, so that reactive current of each phase can be well compensated;
2) Power electronic converter type compensation: the method comprises the steps of transferring active power among three phases by using a power electronic converter so as to solve the problem of unbalanced load of a three-phase winding of a transformer, wherein the power electronic type three-phase load automatic regulating device utilizes a reactive generator (SVG) to inject different reactive currents between the phases so as to reduce the unbalanced degree;
3) Phase change switch: the phase changer is additionally arranged on a part of single-phase load in the distribution network, so that the single-phase load is changed into a controllable load; the main controller detects the balance condition of the three-phase load, and makes an optimization decision on the single-phase load in real time, so that the load of the whole station area is uniformly distributed on the three-phase power supply line.
Droop control is one of the common control methods for three-phase full-bridge inverters. Depending on the converter control objective, a droop curve similar to a conventional generator may be used to achieve power control of the converter. The principle is that the inverter detects the respective output power, and the two active and reactive power parts are independently decoupled and controlled, and the droop characteristic is utilized to deduce the reference value of the output voltage amplitude and frequency, so that the active and reactive power of the system are reasonably distributed. However, in the conventional droop control, after the total power transmitted by the three-phase converter is obtained, the reference values of the amplitude and the phase of the three-phase voltage can be calculated. At this time, the three-phase reference voltages have the characteristics of equal amplitude and 120 DEG phase difference. However, when the alternating current bus voltage works in an unbalanced state, the transmission power of each phase cannot be controlled independently, and the voltage reference in the control link still presents the characteristic of three-phase symmetry and has larger deviation from the actual three-phase voltage. The control voltage reference will lead to a reduced control accuracy and even to a control instability. In summary, the droop control method capable of realizing three-phase independent control is provided, and a convenient and effective method is provided for inhibiting three-phase voltage unbalance of the full-bridge converter.
Disclosure of Invention
The invention provides a three-phase unbalance management device based on three-droop control, which is used for solving the problem that the control precision is low because three phases cannot be independently controlled in the traditional droop control.
The invention is realized by adopting the following technical scheme: a three-phase unbalance management device based on three-droop control is characterized in that a topological structure is formed by connecting a three-phase voltage type PWM bridge rectifier taking an IGBT anti-parallel diode as a switching device with a direct current load. The output side of the rectifier is connected with the direct current load in parallel through a capacitor C, and the input side of the rectifier is connected to an unbalance management source through an LC filter device.
Through mathematical derivation and understanding of the sagging model, it is recognized that the essence of sagging characteristics is a linear correspondence. Although it is generally applied to control of an inverter, it is known that the correspondence relationship between voltage and power in this form can be similarly applied to control of a rectifier by designing an appropriate rectifier model and estimating droop characteristics.
The three-phase unbalance management strategy based on droop control is to formulate an unbalance consumption strategy of the management device on each phase of power based on the unbalance condition of alternating current load grid-connected point voltage, convert a power reference value into a voltage reference value by using droop characteristics in a low-voltage distribution network, and finally obtain a voltage driving instruction of the three-phase PWM rectifier by PI control setting in a voltage-current double closed loop. The method comprises the following steps:
firstly, the power calculation module collects the voltage of the AC load grid-connected pointAnd current flowing into the abatement deviceObtaining the active power input to the abatement device by power calculation formula 1 and power calculation formula 2And reactive powerThe method comprises the steps of carrying out a first treatment on the surface of the Active powerAnd reactive powerWill be sent to the droop control module to obtain the amplitude of the voltage at the inlet of the treatment device according to the droop characteristic equation 3 and the droop characteristic equation 4 of the low-voltage distribution networkAnd frequency ofThe method comprises the steps of carrying out a first treatment on the surface of the The inlet voltage of the treatment device is also the voltage of the AC load grid connection point, and the output quantity of the sagging control module is finally used as the reference voltage of the voltage ring from the subsequent design point of viewThree-phase voltage type PWM (pulse Width modulation) is obtained by classical PI (proportional-integral) control setting through voltage and current double closed loopsVoltage driving signal of bridge rectifier. And as the final control objective is to reduce the unbalance of the voltage of the parallel grid of the alternating current load, the reference voltage of the voltage ring needs to be as symmetrical as possible, and the phase of the three-phase reference voltage in the voltage synthesis module is designed to be 0-2 pi/3 2 pi/3]。
The power calculation formula 1 is
（1）
In which the real part of the product of the voltage phasor and the current phasor conjugate is used as the active power of the transmission, u a 、u b 、u c A phase voltage, b phase voltage and c phase voltage of the AC load grid-connected point respectively, i a 、i b 、i c Respectively a phase current, a b phase current and a c phase current flowing into the treatment device, P a 、P b 、P c The active power of a phase, the active power of b phase and the active power of c phase of the treatment device are respectively.
The power calculation formula 2 is
（2）
Wherein the imaginary part of the conjugate product of the voltage phasor and the current phasor is used as the reactive power of the transmission; q (Q) a 、Q b 、Q c The reactive power of the a phase, the reactive power of the b phase and the reactive power of the c phase of the treatment device are respectively.
Sag property calculation 3 is
（3）
Of the formula (I)The input side a phase voltage amplitude reference value, b phase voltage amplitude reference value and c phase voltage amplitude reference value of the treatment device are respectivelyA quasi-value;the characteristic coefficients of the sagging of the U-P phase a, the sagging of the U-P phase b and the sagging of the U-P phase c are respectively shown;the input side of the treatment device is respectively provided with an a-phase active power reference value, a b-phase active power reference value and a c-phase active power reference value.
Sag property calculation formula 4 is
（4）
Of the formula (I)The reference value of a phase voltage frequency, the reference value of b phase voltage frequency and the reference value of c phase voltage frequency at the input side of the treatment device are respectively; n is n a 、n b 、n c The characteristic coefficients of the a phase omega-Q sagging, the b phase omega-Q sagging and the c phase omega-Q sagging are respectively shown as the characteristic coefficients of the a phase omega-Q sagging and the b phase omega-Q sagging;the input side of the treatment device is respectively provided with an a-phase reactive power reference value, a b-phase reactive power reference value and a c-phase reactive power reference value.
The three-phase unbalance management device based on the three sagging control is characterized in that power calculation, sagging control driving and rectifier bridge PWM modulation are realized through a DSP microprocessor.
According to the three-phase unbalance management device based on the three-sagging control, the sagging control is used for converting the power instruction for managing the three-phase unbalance into the voltage instruction, and the triggering of the three-phase voltage type PWM bridge rectifier is realized by combining the voltage and current double closed-loop control.
According to the three-phase unbalance management device based on the three-sagging control, according to the management thought that the power of one phase with high voltage of a grid-connected point can be reduced by more consumption of the power of the phase by the management device, a power instruction for managing the three-phase unbalance is converted into a voltage instruction of the grid-connected point through sagging control. Controlling the output of the unbalanced voltage command is significantly easier to implement and better than controlling the output of the unbalanced power command. And finally, a classical voltage and current double closed-loop control is utilized, and a voltage driving signal of the rectifier is regulated through PI control. The input power of each phase of the alternating current side of the converter is controllable while the determination of the total power consumption of the direct current load is ensured.
Drawings
Fig. 1 is a circuit topology diagram of a three-phase voltage type PWM bridge rectifier employed by abatement apparatus.
Fig. 2 is a simplified single-phase circuit topology of a low-voltage distribution network.
Fig. 3 is a circuit topology diagram of a three-phase imbalance system of the power distribution network after the administration of the abatement device.
FIG. 4 is a block diagram of a control strategy employed by the designed abatement device.
In fig. 1: the three-phase voltage type PWM bridge rectifier is composed of a three-phase bridge circuit taking IGBT anti-parallel diodes as switching devices and a direct current load. The main components of the device are composed of an input side filter device, three pairs of IGBT switching devices and a direct current side filter capacitor. In order to avoid short-circuit faults, the upper power switch tube and the lower power switch tube in the three-phase bridge are complementary in conduction, namely, when the upper bridge arm switch tube is conducted, the upper bridge arm switch tube is turned off corresponding to the lower bridge arm power switch tube.
In fig. 2:for the supply voltage to be the same,as the line impedance, the sag characteristic in the low-voltage distribution network is researched, the line impedance is resistive, and R is the line resistance value;in the event of an ac load,is the voltage of the grid-connected point of the alternating current load and is alsoThe input voltage of the treatment device;for the complex power injected into the abatement device, P, Q is the active and reactive power input to the abatement device.
In fig. 3: u (u) a 、u b 、u c Is the three-phase voltage of the AC load grid-connected point, v a 、v b 、v c Is the midpoint voltage of each bridge arm of the rectifier. The designed unbalanced harnessing device has a three-phase voltage type PWM rectifier, an LC filter is adopted at the input side of the rectifier (facilitating the adjustment of PI parameters in the follow-up voltage and current double closed loops), and a voltage stabilizing capacitor is adopted at the output side of the rectifierDirect current load。
In fig. 4:for the active power input to the abatement device,for the reactive power input to the abatement device,to govern the voltage amplitude at the inlet of the device,to govern the frequency of the voltage at the inlet of the device,for the reference voltage of the synthesized ac load grid-connected point,the driving voltage of the three-phase voltage type PWM bridge rectifier is output by a voltage and current double closed loop. In the power calculation module, the current flowing into the treatment device and the voltage of the grid-connected point are calculated to obtainThe power of the abatement device is input. The droop control module obtains the voltage amplitude and the frequency at the inlet of the device according to the droop characteristics of U-P and omega-Q in the low-voltage distribution network. And the voltage-current double closed loop module takes the obtained reference voltage of the AC load grid-connected point as the reference voltage of a voltage loop and obtains a voltage driving signal of the rectifier by classical PI control setting.
Detailed Description
And deducing a sagging characteristic relation in the low-voltage distribution network, taking the reference voltage value obtained based on sagging control as the reference voltage of the voltage ring in the voltage-current double closed loop, and setting PI parameters in the double closed loop by combining the topology of the rectifier. The output of the double closed loops is subjected to PWM modulation to obtain a voltage driving signal of the rectifier.
（5）
S is the complex power injected into the treatment device, which is equal to the conjugate of the voltage phasor multiplied by the current phasor, and generally considers the phase difference between the voltage of the large power grid and the voltage of the AC load grid-connected point when the power distribution network system normally operatesBased on the small difference, the formula (5) is simplified
（6）
Respectively by the phase angle of the voltage at the grid-connected pointAnd amplitude valueAnd (3) partial derivatives are calculated for the active power P and the reactive power Q in the variable pair formula (6), so that the change relation of the two variables to the active power P and the reactive power Q is obtained. Analysis shows that the correlation between P and U in the low-voltage distribution network is larger than that between P and U in the low-voltage distribution networkThe correlation of P to U is far greater than to UIs a function of (1); q and QIs greater than its correlation with U, i.e. Q pairIs much greater than the effect on U. So when the control strategy is formulated later, the following steps are adoptedAnd (3) withThese two sets of droop characteristics equations.
The three-phase voltage type PWM rectifier is composed of a three-phase bridge circuit taking an IGBT anti-parallel diode as a switching device. The main components of the device are composed of an input side three-phase filter device, three pairs of IGBT switching devices and a direct current side filter capacitor.
The invention relates to a three-phase imbalance treatment device based on three-sagging control, which is specifically developed as follows:
in the power calculation module, the power input into the treatment device is obtained by calculating the current and the grid-connected point voltage of the inflow treatment device according to the power calculation formula 1 and the power calculation formula 2. The sagging control module is used for controlling the low-voltage distribution networkAnd (3) withThe droop characteristics equation 3 and the droop characteristics equation 4 give the voltage amplitude and frequency at the device inlet. And the voltage-current double closed loop module takes the obtained reference voltage of the AC load grid-connected point as the reference voltage of a voltage loop, and the voltage driving signal of the three-phase rectifier is obtained by classical PI control setting.
The power calculation formula 1 is
（1）
In which the real part of the product of the voltage phasor and the current phasor conjugate is used as the active power of the transmission, u a 、u b 、u c A phase voltage, b phase voltage and c phase voltage of the AC load grid-connected point respectively, i a 、i b 、i c Respectively a phase current, a b phase current and a c phase current flowing into the treatment device, P a 、P b 、P c The active power of a phase, the active power of b phase and the active power of c phase of the treatment device are respectively;
the power calculation formula 2 is
（2）
Wherein the imaginary part of the conjugate product of the voltage phasor and the current phasor is used as the reactive power of the transmission; q (Q) a 、Q b 、Q c The reactive power of a phase, the reactive power of b phase and the reactive power of c phase of the treatment device are respectively;
sag property equation 3 is
（3）
Of the formula (I)The voltage amplitude reference value of a phase voltage, the voltage amplitude reference value of b phase voltage and the voltage amplitude reference value of c phase voltage at the input side of the treatment device are respectively, and the voltage drop on the line impedance is relatively small, so that the amplitude reference usually takes the voltage amplitude 311V at the network side;there are various setting methods for the sagging characteristic coefficient of the a-phase U-P, the sagging characteristic coefficient of the b-phase U-P and the sagging characteristic coefficient of the c-phase U-P respectively;input side a-phase active power references of the abatement device respectivelyThe values of the active power reference value of b phases and the active power reference value of c phases are set to be higher or lower than the voltage of the parallel grid point of the alternating current load, and the active power reference value of one phase with higher voltage is higher or lower than the voltage of the other phase with lower voltage, so that the requirements of all the phases are met，Is the rated power of the DC load.
Sag property equation 4 is
（4）
Of the formula (I)The reference value of the a-phase voltage frequency, the reference value of the b-phase voltage frequency and the reference value of the c-phase voltage frequency at the input side of the treatment device are respectivelyAs a global variable in a low voltage distribution network, the angular frequency reference is typically 314rad/s; n is n a 、n b 、n c There are various setting methods for the a-phase ω -Q sagging characteristic coefficient, the b-phase ω -Q sagging characteristic coefficient, and the c-phase ω -Q sagging characteristic coefficient, respectively;the input side of the treatment device is respectively an a-phase reactive power reference value, a b-phase reactive power reference value and a c-phase reactive power reference value, and the three-phase reactive power reference values which can be obtained according to the last step are setThe design of the filtering part (including passive devices) of the treatment device is combined, and the power factor angle is calculated.
From the voltage of the ac load grid-connected pointAnd current flowing into the abatement deviceObtaining the active power input to the abatement device through the power calculation formula 1 and the power calculation formula 2And reactive powerThe method comprises the steps of carrying out a first treatment on the surface of the Then in the sagging control module, the amplitude of the voltage at the inlet of the treatment device is obtained according to the sagging characteristic equation 3 and the sagging characteristic equation 4 of the low-voltage power distribution networkAnd frequency ofThe method comprises the steps of carrying out a first treatment on the surface of the Finally, combining the output quantity of the sagging control module with the phase instruction to synthesize the reference voltage of the voltage ringInput into a voltage-current double closed loop, and the voltage driving signal of the three-phase PWM voltage type rectifier is obtained by classical PI control setting。
Claims (3)
1. Three-phase unbalance treatment device based on three sagging control, its characterized in that: the three-phase unbalanced management device adopts a three-phase voltage type PWM bridge rectifier topological structure, a control strategy of the three-phase unbalanced management device adopts a three-sagging control method, the three-phase unbalanced management device is suitable for a low-voltage distribution network system, and because the line impedance of the three-phase unbalanced management device is in a resistive characteristic, sagging control adopts U-P and omega-Q modes, and the three-sagging control method comprises the following steps: the power calculation module collects the voltage of the AC load grid-connected pointAnd/or current->Obtaining active power of each phase by power calculation formula 1 and power calculation formula 2>And reactive power->The method comprises the steps of carrying out a first treatment on the surface of the The droop control module obtains the amplitude of the voltage at the inlet of the treatment device according to the droop characteristic equation 3 and the droop characteristic equation 4 of the low-voltage power distribution network>And frequency->The method comprises the steps of carrying out a first treatment on the surface of the The output of the droop control module will eventually be taken as reference voltage of the voltage loop +.>The voltage driving signal of the three-phase voltage type PWM bridge rectifier is obtained through PI control setting by a voltage-current double closed loop>；
The power calculation formula 1 is
，
In which the real part of the product of the voltage phasor and the current phasor conjugate is used as the active power of the transmission, u a 、u b 、u c A phase voltage, b phase voltage and c phase voltage of the AC load grid-connected point respectively, i a 、i b 、i c Respectively a phase current, a b phase current and a c phase current flowing into the treatment device, P a 、P b 、P c The active power of a phase, the active power of b phase and the active power of c phase of the treatment device are respectively;
the power calculation formula 2 is
，
Wherein the imaginary part of the conjugate product of the voltage phasor and the current phasor is used as the reactive power of the transmission; q (Q) a 、Q b 、Q c The reactive power of a phase, the reactive power of b phase and the reactive power of c phase of the treatment device are respectively;
sag property equation 3 is
，
Of the formula (I)The input side a phase voltage amplitude reference value, the b phase voltage amplitude reference value and the c phase voltage amplitude reference value of the treatment device are respectively; />The characteristic coefficients of the sagging of the U-P phase a, the sagging of the U-P phase b and the sagging of the U-P phase c are respectively shown; />The input side a phase active power reference value, the b phase active power reference value and the c phase active power reference value of the treatment device are respectively;
sag property equation 4 is
，
Of the formula (I)The input side a phase voltage frequency reference value, the b phase voltage frequency reference value and the c phase voltage frequency reference value of the treatment device are respectively; n is n a 、n b 、n c Respectively are provided withIs a phase a omega-Q sagging characteristic coefficient, a phase b omega-Q sagging characteristic coefficient and a phase c omega-Q sagging characteristic coefficient; />The input side of the treatment device is respectively provided with an a-phase reactive power reference value, a b-phase reactive power reference value and a c-phase reactive power reference value.
2. The three-phase imbalance management device based on three-sag control according to claim 1, wherein: the power calculation, droop control driving and rectifier bridge PWM modulation are all realized by a DSP microprocessor.
3. A three-phase imbalance management apparatus based on three droop control according to claim 1 or 2, wherein: the power instruction for treating the three-phase imbalance is converted into a voltage instruction through droop control, and the triggering of the three-phase voltage type PWM bridge rectifier is realized by combining voltage and current double closed loop control.
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