CN114744685A - Adaptive power sharing control strategy for multi-voltage-level micro-grid - Google Patents

Adaptive power sharing control strategy for multi-voltage-level micro-grid Download PDF

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CN114744685A
CN114744685A CN202210435671.5A CN202210435671A CN114744685A CN 114744685 A CN114744685 A CN 114744685A CN 202210435671 A CN202210435671 A CN 202210435671A CN 114744685 A CN114744685 A CN 114744685A
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CN114744685B (en
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杨苓
彭志豪
黄海益
章云
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Guangdong University of Technology
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
    • H02J3/48—Controlling the sharing of the in-phase component
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
    • H02J3/50—Controlling the sharing of the out-of-phase component
    • 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
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/493—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode the static converters being arranged for operation in parallel
    • 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
    • H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
    • H02J2203/10—Power transmission or distribution systems management focussing at grid-level, e.g. load flow analysis, node profile computation, meshed network optimisation, active network management or spinning reserve management

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  • Power Engineering (AREA)
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Abstract

The invention discloses a self-adaptive power sharing control strategy of a multi-voltage-level microgrid, which mainly comprises a self-adaptive voltage compensation control module, an improved droop control module and a voltage-current double closed-loop control module, wherein virtual impedance is introduced to enable the total output impedance of an inverter to be inductive/resistive under high/low voltage levels, a proper virtual impedance value is designed to realize the decoupling of power between systems, the self-adaptive voltage compensation module is introduced in the improved droop control to eliminate the deviation between system output voltages and realize the accurate sharing of reactive/active power, and a compensation coefficient is introduced in the self-adaptive voltage compensation module to maintain the output voltage of the inverter within a rated voltage range and ensure the stability of the system.

Description

Adaptive power equalization control strategy for multi-voltage-level microgrid
Technical Field
The invention relates to the field of new energy distributed power generation, in particular to a self-adaptive power sharing control strategy of a multi-voltage-level micro-grid.
Background
At present, the strategic objective of 'double-carbon' is to push the power system in China to be converted to low-carbon clean, and the application of high-proportion new energy power generation in the microgrid becomes a development trend, so that the inverter parallel system becomes a concerned hot spot, and the reliability of the whole microgrid can be improved due to the stable operation of the inverter parallel system. The inverter parallel system control strategy is divided into two types of interconnection lines and non-interconnection lines, the non-interconnection line technology has the advantages of simple structure and higher reliability due to the fact that interconnection signal lines are not needed, and the inverters operate independently, so that the inverter parallel system control strategy is widely applied, droop control can improve system stability, the system has the advantages of plug and play and the like, and the inverter parallel system control strategy is widely researched by many scholars. In a traditional droop control strategy, the output voltage between inverters is deviated due to the fact that the line impedance of an inverter parallel system is not matched, so that power distribution between systems is difficult to achieve equal division, large circulation current exists between systems, and the operation stability of a power grid is damaged. Therefore, the invention provides a self-adaptive power sharing control strategy of a multi-voltage-level micro-grid.
In order to achieve the purpose, the technical scheme provided by the invention is as follows:
1) detecting an output voltage u of an i-th inverter in an improved droop control moduleoiAnd an output current ioiThe active power P is obtained through the power calculation unitiAnd reactive power QiWherein the expression of the power calculation unit is:
Figure BDA0003612693360000011
in the formula uoai、uobiAnd uociAre respectively the output voltage uoiCorresponding abc three-phase voltage, ioai、iobiAnd iociAre respectively the output current ioiCorresponding three phase currents of abc, UdiAnd UqiAre respectively an output voltage uoiCorresponding dq-axis voltage, IdiAnd IqiAre respectively the output current ioiCorresponding dq-axis current, ωiIs the angular frequency.
2) Will have active power PiAnd an active power reference value Pi *Subtracting to obtain the active power error delta PiWhile simultaneously applying a reactive power QiAnd a reactive power reference value Qi *Subtracting to obtain the reactive power error delta QiActive power error Δ PiAnd reactive power error Δ QiObtaining output voltage difference value delta U through different mathematical operationsiDifference of sum angular frequency Δ ωiThe operation process is as follows:
Figure BDA0003612693360000021
in the formula, thetaiFor the impedance angle, θ, corresponding to the i-th inverteri＝arctan(Xi/Ri)，RiIs the sum of the output resistance and the line resistance of the ith inverter, XiIs the sum of the output reactance of the ith inverter and the line reactance.
3) Will output voltage difference value delta UiAnd droop control coefficient niMultiplying to obtain the output voltage transition value UniOutputting a voltage reference value U*And output voltage transition value UniAnd a voltage compensation signal Delta EiSubtracting to obtain the output voltage amplitude UiWhile simultaneously dividing the angular frequency difference Δ ωiAnd droop control coefficient miMultiplying to obtain an angular frequency transition value omegamiAngular frequency reference value omegai *And the angular frequency transition value omegamiSubtracting to obtain angular frequency omegaiAngular frequency omegaiMultiplying the integral step by 1/s to obtain a phase angle
Figure BDA0003612693360000022
Output voltage amplitude UiAngle of sum
Figure BDA0003612693360000023
Passing through a voltage synthesis unit
Figure BDA0003612693360000024
To obtain a leadVoltage reference u after entering virtual impedancerefi *Wherein a voltage compensation signal Delta E is calculated by the adaptive voltage compensation control moduleiThe expression is as follows:
Figure BDA0003612693360000025
in the formula, SiPower distributed to N inverters, KiIs a voltage compensation factor.
4) In a voltage and current double closed-loop control module introducing virtual impedance, a voltage reference value u after the virtual impedance is introducedrefi *And an output current ioiAnd a virtual impedance ZviSubtracting the product of(s) to obtain a reference voltage urefiIs connected to the output voltage uoiAfter subtraction, through voltage loop PI controller Gui(s) obtaining a reference current irefiIs then connected to the inductor current iLiSubtracted by a current loop P controller Gii(s) obtaining a drive voltage usiDriving voltage usiThen comparing with triangular carrier to obtain modulation signal, the main circuit generates voltage under the action of the modulation signal, and the voltage passes through filter inductor LfiAnd a filter capacitor CfiThen becomes the output voltage uoi(ii) a Voltage ring PI controller GuiThe expression of(s) is:
Figure BDA0003612693360000026
kpuiis the proportional coefficient of the PI controller, and the value range is more than or equal to k and is more than or equal to 0.05pui≤2；kiuiIs the integral coefficient of the PI controller, and the value range is k is more than or equal to 500iuiLess than or equal to 800; current loop P controller GiiThe expression of(s) is: gii(s)＝kei，keiIs the proportionality coefficient of P controller, and the value range is more than or equal to 1 and less than or equal to kei≤5。
Compared with the prior art, the principle and the advantages of the scheme are as follows:
the scheme discloses a self-adaptive power sharing control strategy of a multi-voltage-level microgrid, which mainly comprises a self-adaptive voltage compensation control module, an improved droop control module and a voltage and current double-closed-loop control module, wherein virtual impedance is introduced to enable the total output impedance of an inverter to be inductive/resistive under high/low voltage levels, a proper virtual impedance value is designed to achieve decoupling of power between systems, the self-adaptive voltage compensation module is introduced in the improved droop control to eliminate deviation between system output voltages and achieve accurate sharing of reactive/active power, and a compensation coefficient is introduced into the self-adaptive voltage compensation module to enable the output voltage of the inverter to be maintained within a rated voltage range and ensure stability of the system.
Drawings
FIG. 1 is a block diagram of adaptive power equalization control for a multi-voltage class microgrid in an embodiment of the present invention;
FIG. 2 is a power waveform diagram of a conventional control strategy for a low voltage microgrid consistent with embodiments of the present invention;
FIG. 3 is a power waveform of an adaptive control strategy under a low-voltage microgrid in an embodiment of the present invention;
FIG. 4 is a power waveform of a conventional control strategy for a high voltage microgrid in accordance with an embodiment of the present invention;
fig. 5 is a power waveform diagram of a conventional control strategy under a high voltage microgrid in an embodiment of the present invention.
Detailed Description
The invention will be further illustrated with reference to specific examples:
fig. 1 is a block diagram illustrating adaptive power share control of a multi-voltage-class microgrid, where an adaptive power share control strategy of a multi-voltage-class microgrid according to this embodiment includes the following steps:
detecting output voltage u of ith inverter in improved droop control moduleoiAnd an output current ioiThe active power P is obtained through the power calculation unitiAnd reactive power QiWherein the expression of the power calculation unit is:
Figure BDA0003612693360000031
in the formula uoai、uobiAnd uociAre respectively the output voltage uoiCorresponding abc three-phase voltage, ioai、iobiAnd iociAre respectively the output current ioiCorresponding three phase currents of abc, UdiAnd UqiAre respectively the output voltage uoiCorresponding dq-axis voltage, IdiAnd IqiAre respectively an output current ioiCorresponding dq-axis current, ωiIs the angular frequency.
Will have active power PiAnd an active power reference value Pi *Subtracting to obtain the active power error delta PiWhile simultaneously applying a reactive power QiAnd a reactive power reference value Qi *Subtracting to obtain the reactive power error delta QiActive power error Δ PiAnd reactive power error Δ QiObtaining output voltage difference value delta U through different mathematical operationsiDifference of sum angular frequency Δ ωiThe operation process is as follows:
Figure BDA0003612693360000041
in the formula, thetaiFor the impedance angle, θ, corresponding to the i-th inverteri＝arctan(Xi/Ri)，RiIs the sum of the output resistance and the line resistance of the ith inverter, XiIs the sum of the output reactance of the ith inverter and the line reactance.
Will output voltage difference value delta UiAnd droop control coefficient niMultiplying to obtain an output voltage transition value UniOutputting a voltage reference value U*And output voltage transition value UniAnd a voltage compensation signal Delta EiSubtracting to obtain the output voltage amplitude UiWhile simultaneously dividing the angular frequency difference Δ ωiAnd droop control coefficient miMultiplying to obtain an angular frequency transition value omegamiAngular frequency reference value omegai *And the angular frequency transition value omegamiSubtracting to obtain angular frequency omegai Angular frequency ω i1/s phase of sum integral elementMultiplying to obtain a phase angle
Figure BDA0003612693360000042
Output voltage amplitude UiAngle of sum
Figure BDA0003612693360000043
Passing through a voltage synthesis unit
Figure BDA0003612693360000044
Obtaining a voltage reference value u after introducing the virtual impedancerefi *Wherein a voltage compensation signal Delta E is calculated by an adaptive voltage compensation control moduleiThe expression is as follows:
Figure BDA0003612693360000045
in the formula, SiPower distributed to N inverters, KiIs a voltage compensation factor.
In a voltage and current double closed-loop control module introducing virtual impedance, a voltage reference value u after the virtual impedance is introducedrefi *And an output current ioiAnd a virtual impedance ZviSubtracting the product of(s) to obtain a reference voltage urefiIs connected to the output voltage uoiAfter subtraction, through voltage loop PI controller Gui(s) obtaining a reference current irefiIs then connected to the inductor current iLiSubtracted by a current loop P controller Gii(s) obtaining a drive voltage usiDriving voltage usiThen comparing with triangular carrier to obtain modulation signal, the main circuit generates voltage under the action of the modulation signal, and the voltage passes through filter inductor LfiAnd a filter capacitor CfiThen becomes the output voltage uoi(ii) a Voltage ring PI controller GuiThe expression of(s) is:
Figure BDA0003612693360000046
kpuiis the proportional coefficient of the PI controller, and the value range of the proportional coefficient is more than or equal to k and is more than or equal to 0.05pui≤2；kiuiIs the integral coefficient of the PI controller, whichK is not less than 500iuiLess than or equal to 800; current loop P controller GiiThe expression of(s) is: gii(s)＝kei，keiIs the proportional coefficient of the P controller, and the value range of the proportional coefficient is more than or equal to 1 and less than or equal to kei≤5。
Fig. 2 and 3 are power waveform diagrams of a conventional control strategy and an adaptive control strategy under a low-voltage microgrid, respectively, and a reactive power/phase droop coefficient m is 2 × 10-6Active/voltage droop control coefficient n is 4 × 10-7Line impedance of Zl1＝2Ω+2mH，Zl22.2 Ω +2.4 mH. In the experimental process, the load power P is input at the early stageL＝13kW，QL8 kVar; and the load power is increased continuously in the later period, wherein the active power is increased by 7kW, and the reactive power is increased by 4 kVar. Under the traditional control strategy, the deviation of the active power output by the two inverters is large, and the active power output by the two inverters continues to be increased after the common load is increased. The self-adaptive control strategy obviously improves the sharing precision of the active power while keeping higher reactive power sharing precision, and particularly after the load is increased, the active power difference is changed from 1025W to about 10W, and the sharing effect is improved by more than 100 times.
Fig. 4 and 5 are power waveform diagrams of a conventional control strategy and an adaptive control strategy under a high-voltage microgrid, respectively, and an active/phase droop coefficient m is 4 × 10-7The reactive/voltage droop control coefficient n is 2 × 10-6Line impedance of Zl1＝0.02Ω+0.1mH，Zl20.04 Ω +0.2 mH. In the experimental process, the load power P put into the early stageL＝14kW，QL9.5 kVar; and the load power is increased continuously in the later period, wherein the active power is 7.5kW, and the reactive power is 3.5 kVar. Compared with the traditional control strategy, the self-adaptive control strategy ensures that the active power has a good sharing effect on the whole, greatly improves the sharing precision of the reactive power, changes the reactive power difference before load change from 520Var to 15Var, improves the sharing effect by about 35 times, and has a remarkable reactive power sharing effect.
The above-mentioned embodiments are merely preferred embodiments of the present invention, and the scope of the present invention is not limited thereto, so that variations based on the shape and principle of the present invention should be covered within the scope of the present invention.

Claims (3)

1. A self-adaptive power equalization control strategy for a multi-voltage-class microgrid is characterized by comprising the following steps of:
1) detecting an output voltage u of an i-th inverter in an improved droop control moduleoiAnd an output current ioiObtaining active power P through the power calculating unitiAnd reactive power QiWherein the expression of the power calculation unit is:
Figure FDA0003612693350000011
in the formula uoai、uobiAnd uociAre respectively the output voltage uoiCorresponding abc three-phase voltage, ioai、iobiAnd iociAre respectively an output current ioiCorresponding three phase currents of abc, UdiAnd UqiAre respectively the output voltage uoiCorresponding dq-axis voltage, IdiAnd IqiAre respectively the output current ioiCorresponding dq axis current, ωiIs the angular frequency;
2) will have active power PiAnd an active power reference value Pi *Subtracting to obtain the active power error delta PiWhile simultaneously applying a reactive power QiAnd a reactive power reference value Qi *Subtracting to obtain the reactive power error delta QiActive power error Δ PiAnd reactive power error Δ QiObtaining output voltage difference value delta U through different mathematical operationsiDifference of sum angular frequency Δ ωiThe operation process is as follows:
Figure FDA0003612693350000012
in the formula, thetaiFor the impedance angle, θ, corresponding to the i-th inverteri＝arctan(Xi/Ri)，RiIs the sum of the output resistance and the line resistance of the ith inverter, XiThe sum of the output reactance of the ith inverter and the line reactance;
3) will output voltage difference value delta UiAnd a droop control coefficient niMultiplying to obtain an output voltage transition value UniOutputting a voltage reference value U*And output voltage transition value UniAnd a voltage compensation signal Delta EiSubtracting to obtain the output voltage amplitude UiWhile simultaneously dividing the angular frequency difference Δ ωiAnd droop control coefficient miMultiplying to obtain an angular frequency transition value omegamiAngular frequency reference value omegai *And the angular frequency transition value omegamiSubtracting to obtain angular frequency omegaiAngular frequency omegaiMultiplying the integral step by 1/s to obtain a phase angle
Figure FDA0003612693350000013
Output voltage amplitude UiAngle of sum
Figure FDA0003612693350000014
Passing through a voltage synthesis unit
Figure FDA0003612693350000015
Obtaining a voltage reference value u after introducing the virtual impedancerefi *Wherein a voltage compensation signal Delta E is calculated by an adaptive voltage compensation control moduleiThe expression is as follows:
Figure FDA0003612693350000021
in the formula, SiPower distributed to N inverters, KiIs a voltage compensation coefficient;
4) in a voltage and current double closed-loop control module introducing virtual impedance, a voltage reference value u after the virtual impedance is introducedrefi *And an output current ioiAnd a virtual impedance ZviSubtracting the product of(s) to obtain a reference voltage urefiIs connected to the output voltage uoiAfter subtraction, through voltage loop PI controller Gui(s) obtaining a reference current irefiIs then connected to the inductor current iLiSubtracted by a current loop P controller Gii(s) obtaining a drive voltage usiDriving voltage usiThen comparing with triangular carrier to obtain modulation signal, the main circuit generates voltage under the action of the modulation signal, and the voltage passes through filter inductor LfiAnd a filter capacitor CfiThen becomes the output voltage uoi。
2. The adaptive power sharing control strategy for multi-voltage-class micro-grids according to claim 1, characterized in that in step 4), a voltage ring PI controller GuiThe expression of(s) is:
Figure FDA0003612693350000022
kpuiis the proportional coefficient of the PI controller, and the value range of the proportional coefficient is more than or equal to k and is more than or equal to 0.05pui≤2；kiuiIs the integral coefficient of the PI controller, and the value range is k is more than or equal to 500iui≤800。
3. The adaptive power-sharing control strategy for multi-voltage-class microgrid of claim 1, characterized in that in step 4), a current loop P controller GiiThe expression of(s) is: gii(s)＝kei，keiIs the proportionality coefficient of P controller, and the value range is more than or equal to 1 and less than or equal to kei≤5。
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