CN105811455B - Light stores up integration control system based on virtual synchronous power generation characteristic - Google Patents
Light stores up integration control system based on virtual synchronous power generation characteristic Download PDFInfo
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- 238000010248 power generation Methods 0.000 title claims abstract description 156
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- 238000006243 chemical reaction Methods 0.000 claims abstract description 125
- 238000004146 energy storage Methods 0.000 claims abstract description 44
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- 230000002457 bidirectional effect Effects 0.000 claims description 3
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- 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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- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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Abstract
The invention relates to a light storage integrated control system based on virtual synchronous power generation characteristics, which comprises: the power generation unit is sequentially connected with the direct current conversion unit and the alternating current conversion unit, the measurement unit is respectively connected with a connecting line between the power generation unit and the direct current conversion unit, a connecting line between the direct current conversion unit and the alternating current conversion unit, a connecting line between the alternating current conversion unit and a power transmission line and the light storage integrated control unit, the light storage integrated control unit is respectively connected with the control processing unit and the virtual synchronous power generation control unit, the control processing unit is connected with the direct current conversion unit, and the virtual synchronous power generation control unit is connected with the alternating current conversion unit; the system provided by the invention can improve the operation reliability of the system by collecting the photovoltaic and energy storage power generation units at the direct current side, and the system is integrated into a power grid by adopting a control mode of virtual synchronous power generation characteristics, so that the voltage and frequency of the system are quickly supported when the power grid is disconnected, and the power supply reliability of the light-storage integrated system is improved.
Description
Technical Field
The invention relates to the field of IP address positioning, in particular to an optical storage integrated control system based on virtual synchronous power generation characteristics.
Background
With the permeability of the renewable energy grid-connected power generation system in the power system being improved continuously, the new energy power generation has an increasingly large influence on the operation of the power grid. Distributed photovoltaic power generation is distributed at multiple points, output is unstable, and meanwhile, the voltage of the connected power distribution network is low and the capacity is small, so that the high-permeability distributed photovoltaic access brings problems to the voltage stability, the electric energy quality and the operation control of the power distribution network. A series of problems caused by distributed photovoltaic power generation can be effectively solved by utilizing the energy storage system: the active and reactive output of the energy storage system is quickly adjusted to compensate the power fluctuation of photovoltaic power generation, so that the problem of voltage fluctuation of an access point is avoided; the photovoltaic output and load matching are adjusted through the energy storage function of energy storage, and the problems of access point voltage out-of-limit and power flow out-of-limit are avoided; meanwhile, the energy storage and the photovoltaic can form an independent power supply system, so that the power supply reliability and the photovoltaic utilization rate are improved.
At present, the domestic and foreign light and energy storage integrated system is mainly in an alternating current side parallel connection mode, the photovoltaic power generation and energy storage system works in an MPPT mode and PQ control mode respectively, the control mode only can control active and reactive stable output, voltage frequency change of a power grid cannot be effectively supported, the speed is low when the power grid is switched to an independent power supply mode when the power grid is disconnected, the photovoltaic power generation system is often disconnected, and power supply reliability is affected. At present, some researches of photovoltaic and energy storage collected at a direct current side appear in China, but the researches take photovoltaic maximum power generation as a main target, support researches on voltage and frequency changes of a power grid are lacked, and the power supply quality of the power grid can be influenced by large-area access under high permeability.
Disclosure of Invention
The invention provides a light storage integrated control system based on virtual synchronous power generation characteristics, which aims to control photovoltaic fluctuation on a direct current side by a photovoltaic and energy storage power generation unit in a mode of collecting on the direct current side, reduce the impact of characteristics such as intermittence, fluctuation and the like on a power grid, ensure that the photovoltaic on the direct current side can maintain maximum power generation, improve the utilization rate of photovoltaic power generation, stabilize direct current bus voltage by an energy storage system, improve the operation reliability of the system, and quickly support the voltage and frequency of the system when the power grid is disconnected by adopting a control mode of virtual synchronous power generation characteristics to be merged into the power grid, so as to improve the power supply reliability of the light storage integrated system.
The purpose of the invention is realized by adopting the following technical scheme:
in a light storage integrated control system based on virtual synchronous power generation characteristics, the improvement comprising:
the system comprises at least two power generation units, a direct current conversion unit, an alternating current conversion unit, a measurement unit, a light storage integrated control unit, a control processing unit and a virtual synchronous power generation control unit, wherein the power generation units are photovoltaic power generation units or energy storage units, and the at least two power generation units at least comprise one photovoltaic power generation unit and one energy storage unit;
the power generation unit is sequentially connected with the direct current conversion unit and the alternating current conversion unit, the measurement unit is respectively connected with a connecting wire between the power generation unit and the direct current conversion unit, a connecting wire between the direct current conversion unit and the alternating current conversion unit, a connecting wire between the alternating current conversion unit and a power transmission line and the optical storage integrated control unit, the optical storage integrated control unit is respectively connected with the control processing unit and the virtual synchronous power generation control unit, the control processing unit is connected with the direct current conversion unit, and the virtual synchronous power generation control unit is connected with the alternating current conversion unit.
Preferably, the dc conversion unit is a bidirectional BOOST/BUCK circuit, including: the first direct current bus output end, the second direct current bus output end, and a reactance filtering loop L, a capacitance filtering loop C and switching devices G1 and G2 corresponding to the power generation unit;
the first output port of the power generation unit is sequentially connected with a reactance filter circuit L corresponding to the power generation unit in the direct current conversion unit, a switch device G1 corresponding to the power generation unit and a first direct current bus output end, the second output port of the power generation unit is connected with a second direct current bus output end through a direct current bus transmission line, a capacitance filter circuit C is connected between a connection point of the reactance filter circuit L corresponding to the power generation unit and the switch device G1 corresponding to the power generation unit and the direct current bus transmission line, and a switch device G2 corresponding to the power generation unit is connected between a connection point of the first output port of the power generation unit and the reactance filter circuit L corresponding to the power generation unit in the direct current conversion unit and the direct current bus transmission line.
Preferably, the measuring unit is configured to measure a dc bus voltage Vdc between the dc conversion unit and the ac conversion unit, an input side dc voltage Udc and a current Idc of the energy storage unit, an input side dc voltage Udc _1 and a current Idc _1 of the photovoltaic power generation unit, and an output side voltage U, a frequency f, an actual measured value P of active power, and an actual measured value Q of reactive power of the ac conversion unit.
Preferably, the ac conversion unit includes: an isolation transformer T1, a three-phase LC filter and a three-phase full-bridge converter;
the direct current side of the three-phase full-bridge converter is respectively connected with the first direct current bus output end and the second direct current bus output end of the direct current conversion unit, and the alternating current side of the three-phase full-bridge converter is connected into a power grid through the three-phase LC filter and the isolation transformer T1 in sequence.
Preferably, the light and storage integrated control unit is configured to control the control processing unit to process a part of the input of the energy storage unit accessed in the dc conversion unit in a constant voltage control manner, then process a part of the input of the photovoltaic power generation unit accessed in the dc conversion unit in an MPPT control manner, and finally control the virtual synchronous power generation control unit to process the ac conversion unit.
Further, the optical storage integrated control unit is configured to control the processing unit to process, in a constant voltage control manner, a part of the input of the energy storage unit connected to the dc conversion unit, and includes:
outputting a first signal by a first adder from a direct current bus voltage given value Vref and a direct current bus voltage Vdc between the direct current conversion unit and the alternating current conversion unit, wherein the first signal is a signal obtained by subtracting the Vdc from the Vref, and outputting an inner loop current given value Iref by a direct current voltage controller, the inner loop current given value Iref outputs a second signal and a third signal by a second adder and a third adder respectively, the second signal is a signal obtained by subtracting the direct current Idc at the input side of the energy storage unit from the inner loop current given value Iref, the third signal is a signal obtained by subtracting the direct current Idc at the input side of the energy storage unit from the inner loop current given value Iref, the second information sequentially outputs a discharge pulse signal by the direct current voltage controller and a duty ratio regulator, and the third information sequentially outputs a charge pulse signal by the direct current voltage controller and the duty ratio regulator, the enabling end compares a given value Vref of the DC bus voltage with the DC bus voltage Vdc between the DC conversion unit and the AC conversion unit through a comparator, when the comparison value between Vref and Vdc is greater than 0, a discharging pulse is enabled, namely the switching device G2 corresponding to the power generation unit in the DC conversion unit outputs enable, and when the comparison value between Vref and Vdc is less than 0, a charging pulse is enabled, namely the switching device G1 corresponding to the power generation unit in the DC conversion unit outputs enable.
Further, the light storage integrated control unit is configured to control the control processing unit to process the input part of the photovoltaic power generation unit connected to the dc conversion unit in an MPPT control manner, and includes:
the control processing unit acquires the maximum power generation power P _ max of the photovoltaic power generation unit connected in the direct current conversion unit by adopting an MPPT control mode, performs constant voltage control on the direct current voltage at the input side of the photovoltaic power generation unit corresponding to the maximum power generation power P _ max, and outputs PWM pulses to the direct current conversion unit.
Further, the light and storage integrated control unit is configured to control the control processing unit to control the virtual synchronous power generation control unit to process the ac conversion unit, and the control processing unit includes:
manually setting a frequency given value fref, a voltage given value Uref, an active power given value Pref and a reactive power given value Qref;
outputting a fourth signal delta f by a fourth adder between the frequency set value fref and the frequency f at the output side of the alternating current conversion unit, wherein the delta f is fref-f, and amplifying the fourth signal delta f by a frequency coefficient kf to output a torque change signal delta T;
outputting an active power droop signal from the actual measured value P of the active power at the output side of the alternating current conversion unit through droop control, outputting a fifth signal from the active power droop signal and the active power given value Pref through a fifth adder, wherein the fifth signal is a Pref-active power droop signal, and outputting an active start torque signal T0 from the fifth signal through a divider, wherein a division coefficient of the divider is an angular frequency ω;
outputting a virtual mechanical torque value Tm from the torque change signal Δ T and the active start torque signal T0 through a sixth adder, wherein Tm is Δ T-T0;
outputting a seventh signal by a seventh adder between the voltage given value Uref and the voltage U at the output side of the alternating current conversion unit, wherein the seventh signal is Uref-U, and amplifying the seventh signal by a voltage coefficient ku to output an excitation voltage variation quantity delta Eu;
outputting a reactive power droop signal from the actually measured value Q of the reactive power at the output side of the alternating current conversion unit through droop control, and outputting an eighth signal from the reactive power droop signal and the reactive power given value Qref through an eighth adder, wherein the eighth signal is a reactive potential variation Δ Eq, and the Δ Eq is a Qref-reactive power droop signal;
outputting an electric excitation voltage value E by a ninth adder through the excitation voltage variation quantity delta Eu and the reactive potential variation quantity delta Eq, wherein E is delta Eu-delta Eq;
and inputting the virtual mechanical torque value Tm and the electric excitation voltage value E to a PWM controller through a mechanical torque regulator and an electric excitation regulator respectively.
The invention has the beneficial effects that:
the invention provides a light storage integrated control system based on virtual synchronous power generation characteristics, which adopts a mode of collecting photovoltaic and stored energy on a direct current side, controls photovoltaic fluctuation on the direct current side, reduces the impact of intermittent, fluctuating and other characteristics on a power grid, adopts a constant voltage control mode to stabilize direct current bus voltage for control, adopts a maximum power tracking mode for a photovoltaic power generation unit, effectively restrains the power fluctuation of photovoltaic power generation on the direct current side while ensuring the photovoltaic power generation efficiency, and reduces the influence on the power grid on an alternating current side; the control mode of virtual synchronous power generation characteristics is adopted at the grid-connected side of the alternating current, the inertia of the optical storage integrated system is enhanced, the anti-disturbance capacity is high, the voltage and the frequency of the alternating current side are stabilized in an off-grid mode, the impact load influence is reduced, and the power supply reliability of the system is improved.
Drawings
Fig. 1 is a structural diagram of an integrated optical storage control system based on virtual synchronous power generation characteristics according to the present invention;
fig. 2 is a structural diagram of an integrated optical storage control system based on virtual synchronous power generation characteristics in an embodiment of the present invention;
FIG. 3 is a block diagram of constant voltage control of an energy storage and power generation unit according to an embodiment of the present invention;
FIG. 4 is a block diagram of photovoltaic MPPT control in an embodiment provided by the present invention;
FIG. 5 is a block diagram illustrating virtual synchronous power generation characteristic control in an embodiment of the present invention;
FIG. 6 shows a bus voltage at the DC side and an output power waveform of the photovoltaic power generation unit according to an embodiment of the present invention;
fig. 7 is an output current waveform of the integrated optical storage system during grid connection in the embodiment of the present invention.
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a light storage integrated control system based on virtual synchronous power generation characteristics, as shown in fig. 1, comprising:
the system comprises at least two power generation units, a direct current conversion unit, an alternating current conversion unit, a measurement unit, a light storage integrated control unit, a control processing unit and a virtual synchronous power generation control unit, wherein the power generation units are photovoltaic power generation units or energy storage units, and the at least two power generation units at least comprise one photovoltaic power generation unit and one energy storage unit;
the power generation unit is sequentially connected with the direct current conversion unit and the alternating current conversion unit, the measurement unit is respectively connected with a connecting wire between the power generation unit and the direct current conversion unit, a connecting wire between the direct current conversion unit and the alternating current conversion unit, a connecting wire between the alternating current conversion unit and a power transmission line and the optical storage integrated control unit, the optical storage integrated control unit is respectively connected with the control processing unit and the virtual synchronous power generation control unit, the control processing unit is connected with the direct current conversion unit, and the virtual synchronous power generation control unit is connected with the alternating current conversion unit.
For example, in the application scenario shown in fig. 2, the following are included: first photovoltaic power generation unit, second photovoltaic power generation unit and the first energy storage unit of multichannel input to and light stores up integrated control system's direct current transform unit, alternating current transform unit, measuring unit, light and store up integrated control unit, control processing unit and virtual synchronous power generation control unit, wherein, light stores up integrated control system's direct current transform unit and includes: the light-storage integrated control system comprises capacitance filter circuits C1, C2 and C3, reactance filter circuits L1, L2 and L3, switching devices G11, G12, G21, G22, G31 and G32, wherein an alternating current conversion unit of the light-storage integrated control system comprises: the circuit comprises an isolation transformer T1, capacitance filter circuits C4, C5 and C6, reactance filter circuits L4, L5 and L6, and switching devices G41, G42, G51, G52, G61 and G62.
Specifically, the dc conversion unit is a bidirectional BOOST/BUCK circuit, including: the first direct current bus output end, the second direct current bus output end, and a reactance filtering loop L, a capacitance filtering loop C and switching devices G1 and G2 corresponding to the power generation unit;
the first output port of the power generation unit is sequentially connected with a reactance filter circuit L corresponding to the power generation unit in the direct current conversion unit, a switch device G1 corresponding to the power generation unit and a first direct current bus output end, the second output port of the power generation unit is connected with a second direct current bus output end through a direct current bus transmission line, a capacitance filter circuit C is connected between a connection point of the reactance filter circuit L corresponding to the power generation unit and the switch device G1 corresponding to the power generation unit and the direct current bus transmission line, and a switch device G2 corresponding to the power generation unit is connected between a connection point of the first output port of the power generation unit and the reactance filter circuit L corresponding to the power generation unit in the direct current conversion unit and the direct current bus transmission line.
For example, in an application scenario as shown in fig. 2, the dc conversion unit of the integrated storage control system includes: a reactance filtering loop L1, a capacitance filtering loop C1, switching devices G11 and G12 corresponding to the first photovoltaic power generation unit, a reactance filtering loop L2, a capacitance filtering loop C2, switching devices G21 and G22 corresponding to the second photovoltaic power generation unit, a reactance filtering loop L3, a capacitance filtering loop C3, switching devices G31 and G32 corresponding to the first energy storage unit, a first direct current bus output end and a second direct current bus output end;
the first output port of the first photovoltaic power generation unit is connected with a reactance filter circuit L1 corresponding to the first photovoltaic power generation unit, a switch device G11 corresponding to the first photovoltaic power generation unit and a first direct current bus output end in sequence in the direct current conversion unit, the first output port of the second photovoltaic power generation unit is connected with a reactance filter circuit L2 corresponding to the second photovoltaic power generation unit, a switch device G21 corresponding to the second photovoltaic power generation unit and a first direct current bus output end in sequence in the direct current conversion unit, the first output port of the first energy storage unit is connected with a reactance filter circuit L3 corresponding to the first energy storage unit, a switch device G31 corresponding to the first energy storage unit and a first direct current bus output end in sequence in the direct current conversion unit, the second output ports of the first photovoltaic power generation unit, the second photovoltaic power generation unit and the first energy storage unit are connected with a second direct current bus output end through a direct current bus, a capacitor filter circuit C1 is connected between a connecting point between the reactance filter circuit L1 corresponding to the first photovoltaic power generation unit and the switch device G11 corresponding to the first photovoltaic power generation unit and the direct-current bus transmission line, and a switch device G12 corresponding to the first photovoltaic power generation unit is connected between a connecting point between the first output port of the first photovoltaic power generation unit and the reactance filter circuit L1 corresponding to the first photovoltaic power generation unit in the direct-current conversion unit and the direct-current bus transmission line; a capacitor filter circuit C2 is connected between a connecting point between the reactance filter circuit L2 corresponding to the second photovoltaic power generation unit and the switch device G21 corresponding to the second photovoltaic power generation unit and the direct-current bus transmission line, and a switch device G22 corresponding to the second photovoltaic power generation unit is connected between a connecting point between the first output port of the second photovoltaic power generation unit and the reactance filter circuit L2 corresponding to the second photovoltaic power generation unit in the direct-current conversion unit and the direct-current bus transmission line; a capacitor filter circuit C3 is connected between the connection point between the reactance filter circuit L3 corresponding to the first energy storage unit and the switch device G31 corresponding to the first energy storage unit and the dc bus transmission line, and a switch device G32 corresponding to the first energy storage unit is connected between the connection point between the first output port of the first energy storage unit and the reactance filter circuit L3 corresponding to the first energy storage unit in the dc conversion unit and the dc bus transmission line.
The measuring unit is used for measuring a direct current bus voltage Vdc between the direct current conversion unit and the alternating current conversion unit, an input side direct current voltage Udc and current Idc of the energy storage unit, an input side direct current voltage Udc _1 and current Idc _1 of the photovoltaic power generation unit, and an output side voltage U, frequency f, an active power measured value P and a reactive power measured value Q of the alternating current conversion unit.
The AC conversion unit includes: an isolation transformer T1, a three-phase LC filter and a three-phase full-bridge converter;
the direct current side of the three-phase full-bridge converter is respectively connected with the first direct current bus output end and the second direct current bus output end of the direct current conversion unit, and the alternating current side of the three-phase full-bridge converter is connected into a power grid through the three-phase LC filter and the isolation transformer T1 in sequence.
For example, in the application scenario shown in fig. 2, the ac conversion unit of the integrated light-storage control system includes: the circuit comprises an isolation transformer T1, capacitance filter circuits C4, C5 and C6, reactance filter circuits L4, L5 and L6, and switching devices G41, G42, G51, G52, G61 and G62.
And the light and storage integrated control unit is used for controlling the control processing unit to process the input part of the energy storage unit accessed in the direct current conversion unit in a constant voltage control mode, then to process the input part of the photovoltaic power generation unit accessed in the direct current conversion unit in an MPPT control mode, and finally to control the virtual synchronous power generation control unit to process the alternating current conversion unit.
Further, the light and storage integrated control unit is configured to control the processing unit to process the input portion of the energy storage unit accessed in the dc conversion unit in a constant voltage control manner, so as to stabilize the dc bus voltage and stabilize the photovoltaic power fluctuation, as shown in fig. 3, including:
outputting a first signal by a first adder from a direct current bus voltage given value Vref and a direct current bus voltage Vdc between the direct current conversion unit and the alternating current conversion unit, wherein the first signal is a signal obtained by subtracting the Vdc from the Vref, and outputting an inner loop current given value Iref by a direct current voltage controller, the inner loop current given value Iref outputs a second signal and a third signal by a second adder and a third adder respectively, the second signal is a signal obtained by subtracting the direct current Idc at the input side of the energy storage unit from the inner loop current given value Iref, the third signal is a signal obtained by subtracting the direct current Idc at the input side of the energy storage unit from the inner loop current given value Iref, the second information sequentially outputs a discharge pulse signal by the direct current voltage controller and a duty ratio regulator, and the third information sequentially outputs a charge pulse signal by the direct current voltage controller and the duty ratio regulator, the enabling end compares a given value Vref of the DC bus voltage with the DC bus voltage Vdc between the DC conversion unit and the AC conversion unit through a comparator, when the comparison value between Vref and Vdc is greater than 0, a discharging pulse is enabled, namely the switching device G2 corresponding to the power generation unit in the DC conversion unit outputs enable, when the comparison value between Vref and Vdc is less than 0, a charging pulse is enabled, namely the switching device G1 corresponding to the power generation unit in the DC conversion unit outputs enable;
wherein, the direct current voltage controller is a PI controller.
The light stores up integration control unit for control processing unit adopts MPPT control mode to handle the photovoltaic power generation unit input part of access in the direct current conversion unit, includes:
the control processing unit acquires the maximum power generation power P _ max of the photovoltaic power generation unit connected in the direct current conversion unit by adopting an MPPT control mode, performs constant voltage control on the direct current voltage at the input side of the photovoltaic power generation unit corresponding to the maximum power generation power P _ max, and outputs PWM pulses to the direct current conversion unit.
For example, as shown in fig. 4, the MPPT maximum power tracking control method is adopted to access the photovoltaic power generation part, the photovoltaic power generation power is converged into the dc bus, wherein, the photovoltaic component voltage value Udc _1 and the input current Idc _1 are subjected to power calculation to obtain the real-time photovoltaic power generation power, the maximum power tracking method firstly changes the output voltage control value to generate voltage disturbance, at the moment, the output current of the photovoltaic cell is changed along with the voltage disturbance, the output power and voltage changes of the photovoltaic cell before and after disturbance are measured to determine the disturbance direction of the next period, when the disturbance direction is correct, the output power of the solar energy light energy plate is increased, the solar energy light energy plate is continuously disturbed in the same direction in the next period, otherwise, the solar energy light energy plate is disturbed in the opposite direction, thus, the disturbance and observation are repeated to compare with the memory power to find the given value V of the direct current input voltage at the maximum power point, and then the PWM pulse is output by the constant voltage control strategy.
The light storage integrated control unit is configured to control the control processing unit to control the virtual synchronous power generation control unit to process the ac conversion unit, as shown in fig. 5, and includes:
manually setting a frequency given value fref, a voltage given value Uref, an active power given value Pref and a reactive power given value Qref;
outputting a fourth signal delta f by a fourth adder between the frequency set value fref and the frequency f at the output side of the alternating current conversion unit, wherein the delta f is fref-f, and amplifying the fourth signal delta f by a frequency coefficient kf to output a torque change signal delta T;
outputting an active power droop signal from the actual measured value P of the active power at the output side of the alternating current conversion unit through droop control, outputting a fifth signal from the active power droop signal and the active power given value Pref through a fifth adder, wherein the fifth signal is a Pref-active power droop signal, and outputting an active start torque signal T0 from the fifth signal through a divider, wherein a division coefficient of the divider is an angular frequency ω;
outputting a virtual mechanical torque value Tm from the torque change signal Δ T and the active start torque signal T0 through a sixth adder, wherein Tm is Δ T-T0;
outputting a seventh signal by a seventh adder between the voltage given value Uref and the voltage U at the output side of the alternating current conversion unit, wherein the seventh signal is Uref-U, and amplifying the seventh signal by a voltage coefficient ku to output an excitation voltage variation quantity delta Eu;
outputting a reactive power droop signal from the actually measured value Q of the reactive power at the output side of the alternating current conversion unit through droop control, and outputting an eighth signal from the reactive power droop signal and the reactive power given value Qref through an eighth adder, wherein the eighth signal is a reactive potential variation Δ Eq, and the Δ Eq is a Qref-reactive power droop signal;
outputting an electric excitation voltage value E by a ninth adder through the excitation voltage variation quantity delta Eu and the reactive potential variation quantity delta Eq, wherein E is delta Eu-delta Eq;
and inputting the virtual mechanical torque value Tm and the electric excitation voltage value E to a PWM controller through a mechanical torque regulator and an electric excitation regulator respectively.
Control waveforms of the optical storage integrated control system based on the virtual synchronous power generation characteristic are shown in fig. 6 and fig. 7, wherein fig. 6 is a bus voltage at a direct current side and an output power waveform of a photovoltaic system, fig. 7 is an output current waveform of the optical storage integrated system during grid connection, and the output current waveform meets the requirement of electric energy quality.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.
Claims (5)
1. A light-storage integrated control system based on virtual synchronous power generation characteristics is characterized by comprising:
the system comprises at least two power generation units, a direct current conversion unit, an alternating current conversion unit, a measurement unit, a light storage integrated control unit, a control processing unit and a virtual synchronous power generation control unit, wherein the power generation units are photovoltaic power generation units or energy storage units, and the at least two power generation units at least comprise one photovoltaic power generation unit and one energy storage unit;
the power generation unit is sequentially connected with the direct current conversion unit and the alternating current conversion unit, the measurement unit is respectively connected with a connecting wire between the power generation unit and the direct current conversion unit, a connecting wire between the direct current conversion unit and the alternating current conversion unit, a connecting wire between the alternating current conversion unit and a power transmission line and the optical storage integrated control unit, the optical storage integrated control unit is respectively connected with the control processing unit and the virtual synchronous power generation control unit, the control processing unit is connected with the direct current conversion unit, and the virtual synchronous power generation control unit is connected with the alternating current conversion unit;
the light and storage integrated control unit is used for controlling the control processing unit to process the input part of the energy storage unit accessed in the direct current conversion unit in a constant voltage control mode, then process the input part of the photovoltaic power generation unit accessed in the direct current conversion unit in an MPPT control mode, and finally control the virtual synchronous power generation control unit to process the alternating current conversion unit;
the direct current conversion unit is a bidirectional BOOST/BUCK circuit, and comprises: the first direct current bus output end, the second direct current bus output end, and a reactance filtering loop L, a capacitance filtering loop C and switching devices G1 and G2 corresponding to the power generation unit;
a first output port of the power generation unit is sequentially connected with a reactance filter circuit L corresponding to the power generation unit in the direct current conversion unit, a switch device G1 corresponding to the power generation unit and a first direct current bus output end, a second output port of the power generation unit is connected with a second direct current bus output end through a direct current bus transmission line, a capacitance filter circuit C is connected between a connection point of the reactance filter circuit L corresponding to the power generation unit and the switch device G1 corresponding to the power generation unit and the direct current bus transmission line, and a switch device G2 corresponding to the power generation unit is connected between a connection point of the first output port of the power generation unit and the reactance filter circuit L corresponding to the power generation unit in the direct current conversion unit and the direct current bus transmission line;
the light stores up the integrated control unit for the control processing unit adopts the constant voltage control mode to handle the part of the energy storage unit input that inserts in the direct current conversion unit, include:
outputting a first signal by a first adder from a direct current bus voltage given value Vref and a direct current bus voltage Vdc between the direct current conversion unit and the alternating current conversion unit, wherein the first signal is a signal obtained by subtracting the Vdc from the Vref, and outputting an inner loop current given value Iref by a direct current voltage controller, the inner loop current given value Iref outputs a second signal and a third signal by a second adder and a third adder respectively, the second signal is a signal obtained by subtracting the direct current Idc at the input side of the energy storage unit from the inner loop current given value Iref, the third signal is a signal obtained by subtracting the direct current Idc at the input side of the energy storage unit from the inner loop current given value Iref, the second information sequentially outputs a discharge pulse signal by the direct current voltage controller and a duty ratio regulator, and the third information sequentially outputs a charge pulse signal by the direct current voltage controller and the duty ratio regulator, the enabling end compares a given value Vref of the DC bus voltage with the DC bus voltage Vdc between the DC conversion unit and the AC conversion unit through a comparator, when the comparison value between Vref and Vdc is greater than 0, a discharging pulse is enabled, namely the switching device G2 corresponding to the power generation unit in the DC conversion unit outputs enable, and when the comparison value between Vref and Vdc is less than 0, a charging pulse is enabled, namely the switching device G1 corresponding to the power generation unit in the DC conversion unit outputs enable.
2. The system according to claim 1, wherein the measuring unit is configured to measure a dc bus voltage Vdc, an energy storage unit input side dc voltage Udc and current Idc, a photovoltaic power generation unit input side dc voltage Udc _1 and current Idc _1, and an ac conversion unit output side voltage U, a frequency f, an actual measured value of active power P, and an actual measured value of reactive power Q between the dc conversion unit and the ac conversion unit.
3. The system of claim 1, wherein the ac conversion unit comprises: an isolation transformer T1, a three-phase LC filter and a three-phase full-bridge converter;
the direct current side of the three-phase full-bridge converter is respectively connected with the first direct current bus output end and the second direct current bus output end of the direct current conversion unit, and the alternating current side of the three-phase full-bridge converter is connected into a power grid through the three-phase LC filter and the isolation transformer T1 in sequence.
4. The system of claim 1, wherein the integrated light-storage control unit is configured to control the control processing unit to process the input portion of the photovoltaic power generation unit connected to the dc conversion unit in an MPPT control manner, and the control processing unit includes:
the control processing unit acquires the maximum power generation power P _ max of the photovoltaic power generation unit connected in the direct current conversion unit by adopting an MPPT control mode, performs constant voltage control on the direct current voltage at the input side of the photovoltaic power generation unit corresponding to the maximum power generation power P _ max, and outputs PWM pulses to the direct current conversion unit.
5. The system of claim 1, wherein the light-storage integration control unit is configured to control the virtual synchronous power generation control unit to process the ac conversion unit, and the control method includes:
manually setting a frequency given value fref, a voltage given value Uref, an active power given value Pref and a reactive power given value Qref;
outputting a fourth signal delta f by a fourth adder between the frequency set value fref and the frequency f at the output side of the alternating current conversion unit, wherein the delta f is fref-f, and amplifying the fourth signal delta f by a frequency coefficient kf to output a torque change signal delta T;
outputting an active power droop signal from the actual measured value P of the active power at the output side of the alternating current conversion unit through droop control, outputting a fifth signal from the active power droop signal and the active power given value Pref through a fifth adder, wherein the fifth signal is a Pref-active power droop signal, and outputting an active start torque signal T0 from the fifth signal through a divider, wherein a division coefficient of the divider is an angular frequency ω;
outputting a virtual mechanical torque value Tm from the torque change signal Δ T and the active start torque signal T0 through a sixth adder, wherein Tm is Δ T-T0;
outputting a seventh signal by a seventh adder between the voltage given value Uref and the voltage U at the output side of the alternating current conversion unit, wherein the seventh signal is Uref-U, and amplifying the seventh signal by a voltage coefficient ku to output an excitation voltage variation quantity delta Eu;
outputting a reactive power droop signal from the actually measured value Q of the reactive power at the output side of the alternating current conversion unit through droop control, and outputting an eighth signal from the reactive power droop signal and the reactive power given value Qref through an eighth adder, wherein the eighth signal is a reactive potential variation Δ Eq, and the Δ Eq is a Qref-reactive power droop signal;
outputting an electric excitation voltage value E by a ninth adder through the excitation voltage variation quantity delta Eu and the reactive potential variation quantity delta Eq, wherein E is delta Eu-delta Eq;
and inputting the virtual mechanical torque value Tm and the electric excitation voltage value E to a PWM controller through a mechanical torque regulator and an electric excitation regulator respectively.
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| CN108539747B (en) * | 2018-05-18 | 2021-11-26 | 广东工业大学 | Grid-connected AC/DC hybrid micro-grid control system and method |
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