CN116613781A - Control method of DC bus oscillation suppression device based on duty ratio calculation - Google Patents
Control method of DC bus oscillation suppression device based on duty ratio calculation 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
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
- H02J3/241—The oscillation concerning frequency
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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
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
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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
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
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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
- H02J3/381—Dispersed generators
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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
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
- H02J2003/365—Reducing harmonics or oscillations in HVDC
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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
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/22—The renewable source being solar energy
- H02J2300/24—The renewable source being solar energy of photovoltaic origin
-
- 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
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/28—The renewable source being wind energy
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Abstract
The invention discloses a control method of a DC bus oscillation suppression device based on duty ratio calculation, which mainly comprises an oscillation current control loop and a duty ratio calculation loop, wherein the oscillation current control loop takes DC micro-grid bus current as input quantity, obtains DC micro-grid bus oscillation current through a series of calculation, and increases the capacitance voltage of the oscillation suppression device to a rated value; the duty ratio calculation ring converts the oscillating current into duty ratio output, so that the device generates oscillating current with opposite phase to counteract bus oscillating current. The invention can effectively identify and quickly and accurately inhibit bus oscillation caused by load fluctuation, adapt to different system working conditions and obviously improve the stability of the direct current micro-grid.
Description
Technical Field
The invention relates to the field of direct-current micro-grid energy storage systems, in particular to a control method of a direct-current bus oscillation suppression device based on duty ratio calculation.
Background
The direct-current micro-grid can fully utilize and store distributed power sources such as wind power, photovoltaic power and the like and is connected to a large power grid, and the direct-current micro-grid is very widely focused and studied at present. The bus voltage of the direct current micro-grid is the only index for measuring the power quality and stability of the direct current micro-grid, and ensuring the stability of the direct current bus voltage is the primary condition for realizing the stable operation of the direct current micro-grid. The new energy power generation of the distributed power source such as photoelectricity, wind power and the like is greatly influenced by environmental factors, so that the output power of the power source has larger fluctuation. If power unbalance occurs between the distributed power supply and the load, fluctuation and mutation of the voltage of the direct current bus are caused, so that the stable operation of the direct current micro-grid is seriously affected, and the quality of power supply cannot be ensured; in addition, because of the mutual coupling between the power electronic devices and the line impedance which are connected in a large number of the direct-current micro-grids, a large amount of oscillation power is generated, oscillation fluctuation of the direct-current buses can be caused, the safe operation of electrical equipment is seriously threatened, even protection actions are caused, and power supply interruption is caused. The energy storage devices such as the storage battery in the direct-current micro-grid can reduce the voltage oscillation of the bus and improve the stability of the micro-grid, but the stability supporting capability of the system is insufficient under the condition of large power fluctuation, so that the oscillation suppression device is required to be added to reduce the oscillation power existing in the bus of the direct-current micro-grid and improve the stability of the direct-current micro-grid.
There are two main categories of common oscillation suppression devices: passive oscillation suppression means and active oscillation suppression means. The passive oscillation suppression device provides a low-impedance loop for specific frequency oscillation in the circuit through LC matching design, and achieves the effect of suppressing the oscillation. The passive oscillation suppression device has the advantages of simple structure, low cost, large working capacity and the like, however, the circuit is severely interfered by system impedance and load, oscillation amplification and resonance are easy to occur, and the damping characteristic is poor, so that the practical application capability of the passive oscillation suppression device is poor under the environment with higher filtering requirements and the condition that the system impedance and the load are frequently changed. In contrast, the active oscillation suppression device can actively and dynamically detect harmonic conditions in the circuit, and actively track and eliminate oscillations by generating reverse polarity currents equal to the oscillation amplitudes to be counteracted and reversely delivering the reverse polarity currents to the power grid.
Disclosure of Invention
In order to solve the technical problems, the invention adopts the following technical scheme:
1) The AC power grid passes through a grid side converter and a grid side line resistor R l1 Network side line inductance L l1 Is led into a direct current bus, and the storage battery passes through a storage battery side converter and a storage battery side line resistor R l2 Storage battery side line inductance L l2 Also is led into a direct current bus and passes through a load side line resistor R l3 And a load side line inductance L l3 Supplying power to a constant power load together;
2) In the network side voltage ring, the network side DC capacitance C is detected g Voltage at two ends U dcg The voltage reference value of the grid-side direct current bus is matched with the voltage reference value of the grid-side direct current busAt the same time, the net side voltage ring is input to obtain net side d-axis reference current +.>Wherein the net side d-axis reference current +.>The expression of (2) is
Where s is Laplacian, K droopg For the net side sag factor, C virg For the net side virtual inertia coefficient, T g Is a network side time constant;
3) Obtaining phase angle theta through network side phase-locked loop PLL PLL For AC network voltage u abc Park conversion is carried out to obtain a d-axis component u of the power grid voltage d And a grid voltage q-axis component u q The method comprises the steps of carrying out a first treatment on the surface of the Simultaneously detecting inductance of network side flowing throughL g Ac grid current i of (2) abc Park conversion is carried out to obtain a d-axis component i of the power grid current d And grid current q-axis component i q ；
4) In the network-side current loop, the d-axis component u of the network voltage is used for d Grid voltage q-axis component u q Grid current d-axis component i d Grid current q-axis component i q Net side d-axis reference currentNet side q-axis reference current->Calculating to obtain d-axis component U of driving voltage of network-side converter d And a q-axis component U of the driving voltage q Generating a three-phase voltage signal by inverse Park conversion, comparing with triangular wave to generate a modulation signal, and controlling the network-side converter, wherein the d-axis component U of the driving voltage d And a q-axis component U of the driving voltage q The expressions of (a) are respectively
wherein ,ωe To synchronize the rotation angle frequency, L g Grid-connected inductor for grid-side converter, G d(s) and Gq (s) a net side current loop d-axis PI controller and a q-axis PI controller respectively;
5) In the battery side voltage ring, the battery side DC capacitance C is detected b Voltage at two ends U dcb And the voltage reference value of the direct current bus on the side of the storage batterySimultaneously inputting a battery side voltage loop to obtain a battery side reference current +.>Wherein the battery side reference current->The expression of (2) is
wherein ,Kdroopb C is the coefficient of battery side sag virb T is the virtual inertial coefficient of the storage battery side b Is the battery side time constant;
6) In a battery side current loop, detecting a battery inductance current i b Reference current of accumulator sideWith the inductance current i of the storage battery b After subtraction, the phase difference is passed through a storage battery side PI controller G b (s) obtaining a battery-side inverter drive voltage U b Then comparing the modulated signal with the triangular wave to control the storage battery side converter;
7) In an oscillation current control loop of an oscillation suppression device, a DC bus current i is detected dc The DC bus current i dc With dc bus current i dc The output values of the low-pass filters are subtracted to obtain bus oscillation current i dcr An oscillating current control loop output value i obtained by adding values obtained by three PR controllers connected in parallel bref And then output value of capacitor voltage ring of oscillation suppression deviceAdding to obtain oscillation reference current->Wherein the expression of the PR controller is:
wherein ,Kik Proportional coefficients, K, of PR controllers respectively Rk Controller coefficient, Q, of PR controller k For the bandwidth of PR controller, ω k The oscillation frequency of the DC bus oscillation power is k=1, 2 and 3;
the expression of the capacitance voltage ring of the oscillation suppression device is:
wherein ,for the output value of the capacitive voltage ring of the oscillation suppression means, is->U is the reference value of capacitance voltage of oscillation suppression device cs G is the actual value of the capacitance voltage of the oscillation suppression device u (s) a capacitor voltage loop PI controller of the oscillation suppression device;
8) In a duty cycle calculation loop of an oscillation suppression device, an oscillation reference current is calculatedThe duty ratio D of the IGBT1 in the oscillation suppression device is obtained by calculation through two expressions + And IGBT2 duty cycle D - Then compared with the triangular wave to generate a modulation signal, the duty ratio D of IGBT1 + Duty ratio D with IGBT2 - The expressions are respectively
wherein ,fs For the triangle wave frequency of the oscillation suppression device, L s Inductance for oscillation suppression device, u dc Is the DC bus voltage.
Compared with the prior art, the invention has the following beneficial effects: the invention discloses a control method of a DC bus oscillation suppression device based on duty ratio calculation, which mainly comprises an oscillation current control loop and a duty ratio calculation loop, wherein the oscillation current control loop takes DC micro-grid bus current as input quantity, obtains DC micro-grid bus oscillation current through a series of calculation, and increases the capacitance voltage of the oscillation suppression device to a rated value; the duty ratio calculation ring converts the oscillating current into duty ratio output, so that the device generates oscillating current with opposite phase to counteract bus oscillating current. The invention can effectively identify and quickly and accurately inhibit bus oscillation caused by load fluctuation, adapt to different system working conditions and obviously improve the stability of the direct current micro-grid.
Drawings
FIG. 1 is a topology and control block diagram of an embodiment of the present invention including a DC bus oscillation suppression device;
FIG. 2 shows a bus voltage u according to an embodiment of the present invention dc And load input current i go Changing the waveform;
FIG. 3 is a waveform of an output current of a suppression device according to an embodiment of the present invention;
FIG. 4 shows the bus voltage u before adding the suppression device according to an embodiment of the present invention dc FFT analysis map of (c);
FIG. 5 shows the bus voltage u after adding the suppression device according to an embodiment of the present invention dc FFT analysis map of (c);
FIG. 6 shows the load input current i before adding the suppression device according to an embodiment of the present invention go FFT analysis map of (c);
FIG. 7 shows the load input current i after adding the suppression device according to an embodiment of the present invention go FFT analysis map of (c).
Detailed Description
FIG. 1 is a topology and control block diagram of an AC power grid including a DC bus oscillation suppression device, through a grid-side converter, a grid-side lineRoad resistance R l1 Network side line inductance L l1 Is led into a direct current bus, and the storage battery passes through a storage battery side converter and a storage battery side line resistor R l2 Storage battery side line inductance L l2 Also is led into a direct current bus and passes through a load side line resistor R l3 And a load side line inductance L l3 Supplying power to a constant power load together;
in the network side voltage ring, the network side DC capacitance C is detected g Voltage at two ends U dcg The voltage reference value of the grid-side direct current bus is matched with the voltage reference value of the grid-side direct current busAt the same time, the net side voltage ring is input to obtain net side d-axis reference current +.>Wherein the net side d-axis reference current +.>The expression of (2) is
Where s is Laplacian, K droopg For the net side sag factor, C virg For the net side virtual inertia coefficient, T g Is a network side time constant;
obtaining phase angle theta through network side phase-locked loop PLL PLL For AC network voltage u abc Park conversion is carried out to obtain a d-axis component u of the power grid voltage d And a grid voltage q-axis component u q The method comprises the steps of carrying out a first treatment on the surface of the Simultaneously detecting inductance L at the network side g Ac grid current i of (2) abc Park conversion is carried out to obtain a d-axis component i of the power grid current d And grid current q-axis component i q ；
In the network-side current loop, the d-axis component u of the network voltage is used for d Grid voltage q-axis component u q Grid current d-axis component i d Grid current q-axis component i q Net side d-axis reference currentNet side q-axis reference current->Calculating to obtain d-axis component U of driving voltage of network-side converter d And a q-axis component U of the driving voltage q Generating a three-phase voltage signal by inverse Park conversion, comparing with triangular wave to generate a modulation signal, and controlling the network-side converter, wherein the d-axis component U of the driving voltage d And a q-axis component U of the driving voltage q The expressions of (a) are respectively
wherein ,ωe To synchronize the rotation angle frequency, L g Grid-connected inductor for grid-side converter, G d(s) and Gq (s) a net side current loop d-axis PI controller and a q-axis PI controller respectively;
in the battery side voltage ring, the battery side DC capacitance C is detected b Voltage at two ends U dcb And the voltage reference value of the direct current bus on the side of the storage batterySimultaneously inputting a battery side voltage loop to obtain a battery side reference current +.>Wherein the battery side reference current->The expression of (2) is
wherein ,Kdroopb C is the coefficient of battery side sag virb T is the virtual inertial coefficient of the storage battery side b Is the battery side time constant;
in a battery side current loop, detecting a battery inductance current i b Reference current of accumulator sideWith the inductance current i of the storage battery b After subtraction, the phase difference is passed through a storage battery side PI controller G b (s) obtaining a battery-side inverter drive voltage U b Then comparing the modulated signal with the triangular wave to control the storage battery side converter;
in an oscillation current control loop of an oscillation suppression device, a DC bus current i is detected dc The DC bus current i dc With dc bus current i dc The output values of the low-pass filters are subtracted to obtain bus oscillation current i dcr An oscillating current control loop output value i obtained by adding values obtained by three PR controllers connected in parallel bref And then output value of capacitor voltage ring of oscillation suppression deviceAdding to obtain oscillation reference current->Wherein the expression of the PR controller is:
wherein ,Kik Proportional coefficients, K, of PR controllers respectively Rk Controller coefficient, Q, of PR controller k For the bandwidth of PR controller, ω k The oscillation frequency of the DC bus oscillation power is k=1, 2 and 3;
the expression of the capacitance voltage ring of the oscillation suppression device is:
wherein ,for the output value of the capacitive voltage ring of the oscillation suppression means, is->U is the reference value of capacitance voltage of oscillation suppression device cs G is the actual value of the capacitance voltage of the oscillation suppression device u (s) a capacitor voltage loop PI controller of the oscillation suppression device;
in a duty cycle calculation loop of an oscillation suppression device, an oscillation reference current is calculatedThe duty ratio D of the IGBT1 in the oscillation suppression device is obtained by calculation through two expressions + And IGBT2 duty cycle D - Then compared with the triangular wave to generate a modulation signal, the duty ratio D of IGBT1 + Duty ratio D with IGBT2 - The expressions are respectively
wherein ,fs For the triangle wave frequency of the oscillation suppression device, L s Inductance for oscillation suppression device, u dc Is the DC bus voltage.
Finally, after the introduction of the suppression means, the load inputs a current i go ＝i dc -i ripple Suppression current i generated in suppression device ripple Under the action of (a) the load inputs a current i go Is significantly reduced in the number of oscillations,the power quality of the direct current micro grid is improved.
FIG. 2 shows the bus voltage u dc And load input current i go The waveform of the voltage current changes from oscillation dispersion to stabilization when the system switches into the circuit at 3.5 s.
Fig. 4 and 5 show the busbar voltage u before and after the addition of the suppression device, respectively dc Fig. 6 and 7 are respectively the load input current i before and after adding the suppression device go According to the FFT analysis, in the bus voltage, the voltage amplitude with the oscillation frequency of 71Hz is reduced to 0.17V from 0.94V before the oscillation suppression device is added, the oscillation amplitude of the load input current is reduced to 9.4A from 77.9A after the device is connected, the oscillation is greatly reduced, and the system tends to stably run.
The above embodiments are only preferred embodiments of the present invention, and are not intended to limit the scope of the present invention, so variations in shape and principles of the present invention should be covered.
Claims (1)
1. The control method of the DC bus oscillation suppression device based on duty ratio calculation is characterized by comprising the following steps:
1) The AC power grid passes through a grid side converter and a grid side line resistor R l1 Network side line inductance L l1 Is led into a direct current bus, and the storage battery passes through a storage battery side converter and a storage battery side line resistor R l2 Storage battery side line inductance L l2 Also is led into a direct current bus and passes through a load side line resistor R l3 And a load side line inductance L l3 Supplying power to a constant power load together;
2) In the network side voltage ring, the network side DC capacitance C is detected g Voltage at two ends U dcg The voltage reference value of the grid-side direct current bus is matched with the voltage reference value of the grid-side direct current busAt the same time, the net side voltage ring is input to obtain net side d-axis reference current +.>Wherein the net side d-axis reference current +.>The expression of (2) is
Where s is Laplacian, K droopg For the net side sag factor, C virg For the net side virtual inertia coefficient, T g Is a network side time constant;
3) Obtaining phase angle theta through network side phase-locked loop PLL PLL For AC network voltage u abc Park conversion is carried out to obtain a d-axis component u of the power grid voltage d And a grid voltage q-axis component u q The method comprises the steps of carrying out a first treatment on the surface of the Simultaneously detecting inductance L at the network side g Ac grid current i of (2) abc Park conversion is carried out to obtain a d-axis component i of the power grid current d And grid current q-axis component i q ；
4) In the network-side current loop, the d-axis component u of the network voltage is used for d Grid voltage q-axis component u q Grid current d-axis component i d Grid current q-axis component i q Net side d-axis reference currentNet side q-axis reference current->Calculating to obtain d-axis component U of driving voltage of network-side converter d And a q-axis component U of the driving voltage q Generating a three-phase voltage signal by inverse Park conversion, comparing with triangular wave to generate a modulation signal, and controlling the network-side converter, wherein the d-axis component U of the driving voltage d And a q-axis component U of the driving voltage q The expressions of (a) are respectively
wherein ,ωe To synchronize the rotation angle frequency, L g Grid-connected inductor for grid-side converter, G d(s) and Gq (s) a net side current loop d-axis PI controller and a q-axis PI controller respectively;
5) In the battery side voltage ring, the battery side DC capacitance C is detected b Voltage at two ends U dcb And the voltage reference value of the direct current bus on the side of the storage batterySimultaneously inputting a battery side voltage loop to obtain a battery side reference current +.>Wherein the battery side reference current->The expression of (2) is
wherein ,Kdroopb C is the coefficient of battery side sag virb T is the virtual inertial coefficient of the storage battery side b Is the battery side time constant;
6) In a battery side current loop, detecting a battery inductance current i b Reference current of accumulator sideWith the inductance current i of the storage battery b After subtraction, the phase difference is passed through a storage battery side PI controller G b (s) obtaining a battery-side inverter drive voltage U b Then comparing the modulated signal with the triangular wave to control the storage battery side converter;
7) In an oscillation current control loop of an oscillation suppression device, a DC bus current i is detected dc The DC bus current i dc With dc bus current i dc The output values of the low-pass filters are subtracted to obtain bus oscillation current i dcr An oscillating current control loop output value i obtained by adding values obtained by three PR controllers connected in parallel bref And then output value of capacitor voltage ring of oscillation suppression deviceAdding to obtain oscillation reference current->Wherein the expression of the PR controller is:
wherein ,Kik Proportional coefficients, K, of PR controllers respectively Rk Controller coefficient, Q, of PR controller k For the bandwidth of PR controller, ω k The oscillation frequency of the DC bus oscillation power is k=1, 2 and 3;
the expression of the capacitance voltage ring of the oscillation suppression device is:
wherein ,for the output value of the capacitive voltage ring of the oscillation suppression means, is->U is the reference value of capacitance voltage of oscillation suppression device cs G is the actual value of the capacitance voltage of the oscillation suppression device u (s) a capacitor voltage loop PI controller of the oscillation suppression device;
8) In a duty cycle calculation loop of an oscillation suppression device, an oscillation reference current is calculatedThe duty ratio D of the IGBT1 in the oscillation suppression device is obtained by calculation through two expressions + And IGBT2 duty cycle D - Then compared with the triangular wave to generate a modulation signal, the duty ratio D of IGBT1 + Duty ratio D with IGBT2 - The expressions are respectively
wherein ,fs For the triangle wave frequency of the oscillation suppression device, L s Inductance for oscillation suppression device, u dc Is the DC bus voltage.
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