CN105811455A - Virtual synchronous power generation characteristics-based optical storage integration control system - Google Patents
Virtual synchronous power generation characteristics-based optical storage integration control system Download PDFInfo
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- 238000010248 power generation Methods 0.000 title claims abstract description 24
- 230000010354 integration Effects 0.000 title abstract 5
- 230000003287 optical effect Effects 0.000 title abstract 5
- 238000006243 chemical reaction Methods 0.000 claims abstract description 59
- 238000004146 energy storage Methods 0.000 claims abstract description 42
- 230000005540 biological transmission Effects 0.000 claims abstract description 20
- 238000000034 method Methods 0.000 claims abstract description 8
- 230000008569 process Effects 0.000 claims abstract description 7
- 230000005611 electricity Effects 0.000 claims description 17
- 239000003990 capacitor Substances 0.000 claims description 15
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- 230000005284 excitation Effects 0.000 claims description 12
- 238000004148 unit process Methods 0.000 claims description 3
- 238000005259 measurement Methods 0.000 abstract 1
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- H02J3/383—
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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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- 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 virtual synchronous power generation characteristics-based optical storage integration control system. Power generation units are sequentially connected with a DC conversion unit and an AC conversion unit; a measurement unit is connected with a connection line between the power generation units and the DC conversion unit, the connection line between the DC conversion unit and the AC conversion unit, the connection line between the AC conversion unit and a power transmission line and an optical storage integration control unit; the optical storage integration control unit is connected with a control process unit and a virtual synchronous power generation control unit; the control process unit is connected with the DC conversion unit; and the virtual synchronous power generation control unit is connected with the AC conversion unit. According to the system provided by the invention, in a manner of collecting photovoltaic power generation units and energy storage power generation units at a DC side, the operation reliability of the system is improved; the system is connected to a power grid in a virtual synchronous power generation characteristics control manner; the voltage and the frequency of the system are quickly supported when the power grid is disconnected; and the power supply reliability of the optical storage integration control system is improved.
Description
Technical field
The present invention relates to IP address location field, be specifically related to a kind of light based on virtual synchronous power generation characteristics and store up integral control system.
Background technology
Along with regenerative resource grid-connected system constantly promotes in the permeability of power system, generation of electricity by new energy is increasing on operation of power networks impact.Distributed photovoltaic power generation dispersion multiple spot is arranged, instability of exerting oneself, and is concurrently accessed that distribution network voltage is low, capacity is little, and therefore high permeability distributed photovoltaic accesses to the voltage stabilization of power distribution network, the quality of power supply and runs and control band and serve problem.Utilize energy-storage system can effectively solve the series of problems that distributed photovoltaic power generation brings: to exert oneself by quickly regulating the active reactive of energy-storage system, compensate the power swing of photovoltaic generation, it is to avoid access point voltage pulsation problem occurs；Store function by the energy of energy storage, regulate photovoltaic and exert oneself and load coupling, it is to avoid access point voltage out-of-limit and the out-of-limit problem of trend occur；Energy storage simultaneously and photovoltaic can form autonomous power supply system, improve power supply reliability and photovoltaic utilization rate.
Light stores up the integral system mode based on AC parallel connection both at home and abroad at present; photovoltaic generation and energy-storage system are operated in MPPT mode respectively and PQ controls; this control mode is only capable of controlling the stable output of active reactive; the voltage frequency variations of electrical network effectively cannot be supported; and it is slower to be switched under independently-powered pattern when electrical network disconnects speed; usually can cause the off-grid of photovoltaic generating system, affect power supply reliability.The domestic research occurring in that some photovoltaics and energy storage collect at DC side at present, but all generate electricity as main target with photovoltaic peak power, lacking support research when line voltage and frequency are changed, the large area under high permeability accesses the power supply quality that will affect electrical network.
Summary of the invention
The present invention provides a kind of light based on virtual synchronous power generation characteristics to store up integral control system, its objective is photovoltaic and energy storing and electricity generating unit in the way of collecting at DC side, control photovoltaic fluctuation at DC side, reduce it intermittent, the impact to electrical network of the characteristics such as undulatory property, DC side photovoltaic can keep peak power to generate electricity, improve photovoltaic generation utilization rate, energy-storage system can stable DC busbar voltage, improve the operational reliability of system, and adopt the control mode of virtual synchronous power generation characteristics to be connected to the grid, system voltage and frequency is quickly supported when electrical network disconnects, improve the power supply reliability of light storage integral system.
It is an object of the invention to adopt following technical proposals to realize:
A kind of light based on virtual synchronous power generation characteristics stores up integral control system, and it thes improvement is that, including:
At least two generator unit, DC converting unit, exchange conversion unit, measuring unit, light storage overall-in-one control schema unit, control processing unit and virtual synchronous generation control unit, wherein, described generator unit is photovoltaic generation unit or energy-storage units, and described at least two generator unit at least includes a photovoltaic generation unit and an energy-storage units；
Described generator unit is connected with described DC converting unit and exchange conversion unit successively, described measuring unit connecting line respectively and between described generator unit and described DC converting unit, connecting line between described DC converting unit and described exchange conversion unit, connecting line and described light storage overall-in-one control schema unit between described exchange conversion unit and transmission line of electricity are connected, described light storage overall-in-one control schema unit is connected with described control processing unit and described virtual synchronous generation control unit respectively, described control processing unit is connected with described DC converting unit, described virtual synchronous generation control unit is connected with described exchange conversion unit.
Preferably, described DC converting unit is two-way BOOST/BUCK circuit, including: reactance filter circuit L that the first dc bus outfan, the second dc bus outfan and described generator unit are corresponding, capacitor filtering loop C, switching device G1 and G2；
The reactance filter circuit L that first output port of described generator unit is corresponding with the described generator unit in described DC converting unit successively, switching device G1 and the first dc bus outfan that described generator unit is corresponding connect, second output port of described generator unit connects the second dc bus outfan by dc bus transmission line, junction point between the switching device G1 corresponding with described generator unit for reactance filter circuit L that described generator unit is corresponding and be connected capacitor filtering loop C between described dc bus transmission line, junction point between the reactance filter circuit L that first output port of described generator unit is corresponding with the described generator unit in described DC converting unit and be connected, between described dc bus transmission line, the switching device G2 that described generator unit is corresponding.
Preferably, described measuring unit, is used for the DC bus-bar voltage Vdc, energy-storage units input side DC voltage Udc and electric current Idc, photovoltaic generation unit input side DC voltage Udc_1 and electric current Idc_1 and described exchange conversion unit outlet side voltage U, frequency f, active power measured value P and the reactive power measured value Q that measure between described DC converting unit and described exchange conversion unit.
Preferably, described exchange conversion unit includes: isolating transformer T1, three-phase LC wave filter and three phase full bridge current transformer；
The DC side of described three phase full bridge current transformer connects the first dc bus outfan and the second dc bus outfan of described DC converting unit respectively, and the AC of described three phase full bridge current transformer passes sequentially through described three-phase LC wave filter and isolating transformer T1 accesses electrical network.
Preferably, described light storage overall-in-one control schema unit, the part adopting the energy-storage units input to accessing in described DC converting unit of the constant voltage control mode for controlling described control processing unit processes, then adopt MPPT control mode that the photovoltaic generation unit importation accessed in described DC converting unit is processed, finally control described virtual synchronous generation control unit and described exchange conversion unit is processed.
Further, described light storage overall-in-one control schema unit, adopt for controlling processing unit the part of the constant voltage control mode energy-storage units input to accessing in described DC converting unit to carry out process and include:
nullDC bus-bar voltage Vdc between DC bus-bar voltage set-point Vref and described DC converting unit and described exchange conversion unit is exported the first signal through first adder，The described first information is the Vref signal subtracting Vdc，And by DC voltage controller output internal ring given value of current value Iref，Described internal ring given value of current value Iref exports secondary signal and the 3rd signal respectively through second adder and the 3rd adder，Described secondary signal is the described internal ring given value of current value Iref signal subtracting described energy-storage units input side DC current Idc，Described 3rd information is the described energy-storage units input side DC current Idc signal subtracting described internal ring given value of current value Iref，Described second information is exported discharge pulse signal through DC voltage controller and duty cycle adjustment device successively，Described 3rd information is exported charge pulse signal through DC voltage controller and duty cycle adjustment device successively，DC bus-bar voltage Vdc between DC bus-bar voltage set-point Vref and described DC converting unit and described exchange conversion unit is compared by Enable Pin through comparator，When Vref and Vdc fiducial value is more than 0，Discharge pulse enables，Namely the switching device G2 output that in described DC converting unit, generator unit is corresponding enables，When Vref and Vdc fiducial value is less than 0，Charging pulse enables，Namely the switching device G1 output that in described DC converting unit, generator unit is corresponding enables.
Further, described light storage overall-in-one control schema unit, adopt MPPT control mode that the photovoltaic generation unit importation accessed in described DC converting unit is carried out process and included for controlling described control processing unit:
Described control processing unit adopts MPPT control mode to obtain the maximum generation power P _ max of the photovoltaic generation unit accessed in described DC converting unit, the described photovoltaic generation unit input side DC voltage that described maximum generation power P _ max is corresponding is carried out Isobarically Control, exports pwm pulse to described DC converting unit.
Further, described light storage overall-in-one control schema unit, it is used for controlling described control processing unit and controls described virtual synchronous generation control unit and described exchange conversion unit is carried out process include:
Artificial setpoint frequency set-point fref, voltage set-point Uref, active power set-point Pref and reactive power set-point Qref；
Described frequency set-point fref and described exchange conversion unit outlet side frequency f is exported the 4th signal △ f through the 4th adder, wherein, △ f=fref-f, more described 4th signal △ f is amplified output torque change signal △ T through coefficient of frequency kf；
By described exchange conversion unit outlet side active power measured value P through droop control active power of output droop signal, described active power droop signal is exported the 5th signal with described active power set-point Pref through fifth adder, wherein, described five signals=Pref-active power droop signal, again by described 5th signal through the meritorious initial dtc signal T0 of divider output, wherein, the division factor of described divider is angular frequency；
Described torque change signal △ T is exported virtual machine torque value Tm with described meritorious initial dtc signal T0 through the 6th adder, wherein, Tm=△ T-T0；
Described voltage set-point Uref and described exchange conversion unit outlet side voltage U is exported the 7th signal through the 7th adder, wherein, described seven signals=Uref-U, more described 7th signal is amplified output excitation voltage variable quantity △ Eu through voltage coefficient ku；
By described exchange conversion unit outlet side reactive power measured value Q through droop control output reactive power droop signal, described reactive power droop signal is exported the 8th signal with described reactive power set-point Qref through the 8th adder, wherein, described 8th signal is idle potential change amount △ Eq, △ Eq=Qref-reactive power droop signal；
By described excitation voltage variable quantity △ Eu and described idle potential change amount △ Eq through the 9th adder output electricity excitation voltage value E, wherein, E=△ Eu-△ Eq；
Respectively by described virtual machine torque value Tm and electricity excitation voltage value E by machine torque actuator and electricity field regulator input to PWM controller.
Beneficial effects of the present invention:
A kind of light based on virtual synchronous power generation characteristics provided by the invention stores up integral control system, adopt mode photovoltaic and energy storage collected at DC side, photovoltaic fluctuation is controlled at DC side, reduce the characteristic impacts to electrical network such as its intermittence, undulatory property, on controlling, energy-storage units adopts constant pressure control system stable DC busbar voltage, photovoltaic generation unit adopts maximal power tracing mode, while guaranteeing photovoltaic efficiency, the power swing of photovoltaic generation is effectively suppressed at DC side, reduce the impact on AC electrical network；Exchange grid-connected side and adopt the control mode of virtual synchronous power generation characteristics, strengthen the inertia of light storage integral system, there is stronger Ability of Resisting Disturbance, under off-network pattern, stablize AC voltage and frequency, reduce the impact of impact load, improve the power supply reliability of system.
Accompanying drawing explanation
Fig. 1 is the structure chart that a kind of light based on virtual synchronous power generation characteristics of the present invention stores up integral control system；
Fig. 2 is the structure chart that in embodiment provided by the invention, a kind of light based on virtual synchronous power generation characteristics stores up integral control system；
Fig. 3 is the Isobarically Control block diagram of energy storing and electricity generating unit in embodiment provided by the invention；
Fig. 4 is photovoltaic MPPT control block diagram in embodiment provided by the invention；
Fig. 5 is virtual synchronous power generation characteristics control block diagram in embodiment provided by the invention；
Fig. 6 is the output waveform of the busbar voltage of DC side in embodiment provided by the invention and photovoltaic generation unit；
Output current wave when Fig. 7 is that in embodiment provided by the invention, light storage integral system is grid-connected.
Detailed description of the invention
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is elaborated.
For making the purpose of the embodiment of the present invention, technical scheme and advantage clearly, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is a part of embodiment of the present invention, rather than whole embodiments.Based on the embodiment in the present invention, all other embodiments that those of ordinary skill in the art obtain under not making creative work premise, broadly fall into the scope of protection of the invention.
A kind of light based on virtual synchronous power generation characteristics provided by the invention stores up integral control system, as it is shown in figure 1, include:
At least two generator unit, DC converting unit, exchange conversion unit, measuring unit, light storage overall-in-one control schema unit, control processing unit and virtual synchronous generation control unit, wherein, described generator unit is photovoltaic generation unit or energy-storage units, and described at least two generator unit at least includes a photovoltaic generation unit and an energy-storage units；
Described generator unit is connected with described DC converting unit and exchange conversion unit successively, described measuring unit connecting line respectively and between described generator unit and described DC converting unit, connecting line between described DC converting unit and described exchange conversion unit, connecting line and described light storage overall-in-one control schema unit between described exchange conversion unit and transmission line of electricity are connected, described light storage overall-in-one control schema unit is connected with described control processing unit and described virtual synchronous generation control unit respectively, described control processing unit is connected with described DC converting unit, described virtual synchronous generation control unit is connected with described exchange conversion unit.
nullSuch as，In application scenarios as shown in Figure 2，Including: the first photovoltaic generation unit of multichannel input、Second photovoltaic generation unit and the first energy-storage units，And the DC converting unit of light storage integral control system、Exchange conversion unit、Measuring unit、Light storage overall-in-one control schema unit、Control processing unit and virtual synchronous generation control unit，Wherein，The DC converting unit of light storage integral control system includes: capacitor filtering loop C1、C2、C3，Reactance filter circuit L1、L2、L3，And switching device G11、G12、G21、G22、G31、G32，The exchange conversion unit of light storage integral control system includes: isolating transformer T1，Capacitor filtering loop C4、C5、C6，Reactance filter circuit L4、L5、L6，And switching device G41、G42、G51、G52、G61、G62.
Concrete, described DC converting unit is two-way BOOST/BUCK circuit, including: reactance filter circuit L that the first dc bus outfan, the second dc bus outfan and described generator unit are corresponding, capacitor filtering loop C, switching device G1 and G2；
The reactance filter circuit L that first output port of described generator unit is corresponding with the described generator unit in described DC converting unit successively, switching device G1 and the first dc bus outfan that described generator unit is corresponding connect, second output port of described generator unit connects the second dc bus outfan by dc bus transmission line, junction point between the switching device G1 corresponding with described generator unit for reactance filter circuit L that described generator unit is corresponding and be connected capacitor filtering loop C between described dc bus transmission line, junction point between the reactance filter circuit L that first output port of described generator unit is corresponding with the described generator unit in described DC converting unit and be connected, between described dc bus transmission line, the switching device G2 that described generator unit is corresponding.
Such as, in application scenarios as shown in Figure 2, the DC converting unit of storage integral control system includes: reactance filter circuit L1 that the first photovoltaic generation unit is corresponding, capacitor filtering loop C1, switching device G11 and G12, reactance filter circuit L2 that second photovoltaic generation unit is corresponding, capacitor filtering loop C2, switching device G21 and G22, reactance filter circuit L3 that first energy-storage units is corresponding, capacitor filtering loop C3, switching device G31 and G32, and the first dc bus outfan and the second dc bus outfan；
nullThe reactance filter circuit L1 that first output port of the first photovoltaic generation unit is corresponding with the first photovoltaic generation unit in described DC converting unit successively、Switching device G11 and the first dc bus outfan that first photovoltaic generation unit is corresponding connect，The reactance filter circuit L2 that first output port of the second photovoltaic generation unit is corresponding with the second photovoltaic generation unit in described DC converting unit successively、Switching device G21 and the first dc bus outfan that second photovoltaic generation unit is corresponding connect，The reactance filter circuit L3 that first output port of the first energy-storage units is corresponding with the first energy-storage units in described DC converting unit successively、Switching device G31 and the first dc bus outfan that first energy-storage units is corresponding connect，First photovoltaic generation unit、Second output port of the second photovoltaic generation unit and the first energy-storage units connects the second dc bus outfan each through dc bus transmission line，It is connected capacitor filtering loop C1 between junction point and described dc bus transmission line between the switching device G11 corresponding with the first photovoltaic generation unit for reactance filter circuit L1 that first photovoltaic generation unit is corresponding，Junction point between the reactance filter circuit L1 that first output port of the first photovoltaic generation unit is corresponding with the first photovoltaic generation unit in described DC converting unit and be connected, between described dc bus transmission line, the switching device G12 that described first photovoltaic generation unit is corresponding；It is connected capacitor filtering loop C2, the junction point between the reactance filter circuit L2 that the first output port of the second photovoltaic generation unit is corresponding with the second photovoltaic generation unit in described DC converting unit and be connected, between described dc bus transmission line, the switching device G22 that described second photovoltaic generation unit is corresponding between junction point and described dc bus transmission line between the switching device G21 corresponding with the second photovoltaic generation unit for reactance filter circuit L2 that second photovoltaic generation unit is corresponding；It is connected capacitor filtering loop C3, the junction point between the reactance filter circuit L3 that the first output port of the first energy-storage units is corresponding with the first energy-storage units in described DC converting unit and be connected, between described dc bus transmission line, the switching device G32 that described first energy-storage units is corresponding between junction point and described dc bus transmission line between the switching device G31 corresponding with the first energy-storage units for reactance filter circuit L3 that first energy-storage units is corresponding.
Described measuring unit, is used for the DC bus-bar voltage Vdc, energy-storage units input side DC voltage Udc and electric current Idc, photovoltaic generation unit input side DC voltage Udc_1 and electric current Idc_1 and described exchange conversion unit outlet side voltage U, frequency f, active power measured value P and the reactive power measured value Q that measure between described DC converting unit and described exchange conversion unit.
Described exchange conversion unit includes: isolating transformer T1, three-phase LC wave filter and three phase full bridge current transformer；
The DC side of described three phase full bridge current transformer connects the first dc bus outfan and the second dc bus outfan of described DC converting unit respectively, and the AC of described three phase full bridge current transformer passes sequentially through described three-phase LC wave filter and isolating transformer T1 accesses electrical network.
Such as, in application scenarios as shown in Figure 2, the exchange conversion unit of light storage integral control system includes: isolating transformer T1, capacitor filtering loop C4, C5, C6, reactance filter circuit L4, L5, L6, and switching device G41, G42, G51, G52, G61, G62.
Described light storage overall-in-one control schema unit, the part adopting the energy-storage units input to accessing in described DC converting unit of the constant voltage control mode for controlling described control processing unit processes, then adopt MPPT control mode that the photovoltaic generation unit importation accessed in described DC converting unit is processed, finally control described virtual synchronous generation control unit and described exchange conversion unit is processed.
Further, described light storage overall-in-one control schema unit, adopt the part of the constant voltage control mode energy-storage units input to accessing in described DC converting unit to process for controlling processing unit, can stable DC busbar voltage, stabilize photovoltaic power fluctuation, as it is shown on figure 3, include:
nullDC bus-bar voltage Vdc between DC bus-bar voltage set-point Vref and described DC converting unit and described exchange conversion unit is exported the first signal through first adder，The described first information is the Vref signal subtracting Vdc，And by DC voltage controller output internal ring given value of current value Iref，Described internal ring given value of current value Iref exports secondary signal and the 3rd signal respectively through second adder and the 3rd adder，Described secondary signal is the described internal ring given value of current value Iref signal subtracting described energy-storage units input side DC current Idc，Described 3rd information is the described energy-storage units input side DC current Idc signal subtracting described internal ring given value of current value Iref，Described second information is exported discharge pulse signal through DC voltage controller and duty cycle adjustment device successively，Described 3rd information is exported charge pulse signal through DC voltage controller and duty cycle adjustment device successively，DC bus-bar voltage Vdc between DC bus-bar voltage set-point Vref and described DC converting unit and described exchange conversion unit is compared by Enable Pin through comparator，When Vref and Vdc fiducial value is more than 0，Discharge pulse enables，Namely the switching device G2 output that in described DC converting unit, generator unit is corresponding enables，When Vref and Vdc fiducial value is less than 0，Charging pulse enables，Namely the switching device G1 output that in described DC converting unit, generator unit is corresponding enables；
Wherein, described DC voltage controller is PI controller.
Described light storage overall-in-one control schema unit, adopts MPPT control mode that the photovoltaic generation unit importation accessed in described DC converting unit is processed for controlling described control processing unit, including:
Described control processing unit adopts MPPT control mode to obtain the maximum generation power P _ max of the photovoltaic generation unit accessed in described DC converting unit, the described photovoltaic generation unit input side DC voltage that described maximum generation power P _ max is corresponding is carried out Isobarically Control, exports pwm pulse to described DC converting unit.
nullSuch as，As shown in Figure 4，MPPT maximal power tracing control mode is adopted to access the part of photovoltaic generation，Photovoltaic generation power is imported in dc bus，Wherein，Photovoltaic module magnitude of voltage Udc_1 and input current Idc_1 obtains real-time photovoltaic generation power via power calculation，Maximum power tracking method is first to change output voltage control value，Produce voltage disturbance，Now the output electric current of photovoltaic cell also will change therewith，By measuring the change of the output power from photovoltaic cells and voltage before and after disturbance，To determine the perturbation direction in next cycle，When perturbation direction is correct, solar energy light energy board output increases，The lower cycle will continue disturbance in the same direction，Otherwise，Disturbance in the opposite direction，So，It is repeatedly performed disturbance and relatively finds the DC input voitage set-point V under maximum power point with observing with memory power ratio，Pwm pulse is exported subsequently by Isobarically Control strategy.
Described light storage overall-in-one control schema unit, is used for controlling the described control processing unit described virtual synchronous generation control unit of control and described exchange conversion unit is processed, as it is shown in figure 5, include:
Artificial setpoint frequency set-point fref, voltage set-point Uref, active power set-point Pref and reactive power set-point Qref；
Described frequency set-point fref and described exchange conversion unit outlet side frequency f is exported the 4th signal △ f through the 4th adder, wherein, △ f=fref-f, more described 4th signal △ f is amplified output torque change signal △ T through coefficient of frequency kf；
By described exchange conversion unit outlet side active power measured value P through droop control active power of output droop signal, described active power droop signal is exported the 5th signal with described active power set-point Pref through fifth adder, wherein, described five signals=Pref-active power droop signal, again by described 5th signal through the meritorious initial dtc signal T0 of divider output, wherein, the division factor of described divider is angular frequency；
Described torque change signal △ T is exported virtual machine torque value Tm with described meritorious initial dtc signal T0 through the 6th adder, wherein, Tm=△ T-T0；
Described voltage set-point Uref and described exchange conversion unit outlet side voltage U is exported the 7th signal through the 7th adder, wherein, described seven signals=Uref-U, more described 7th signal is amplified output excitation voltage variable quantity △ Eu through voltage coefficient ku；
By described exchange conversion unit outlet side reactive power measured value Q through droop control output reactive power droop signal, described reactive power droop signal is exported the 8th signal with described reactive power set-point Qref through the 8th adder, wherein, described 8th signal is idle potential change amount △ Eq, △ Eq=Qref-reactive power droop signal；
By described excitation voltage variable quantity △ Eu and described idle potential change amount △ Eq through the 9th adder output electricity excitation voltage value E, wherein, E=△ Eu-△ Eq；
Respectively by described virtual machine torque value Tm and electricity excitation voltage value E by machine torque actuator and electricity field regulator input to PWM controller.
The control waveform of a kind of light storage integral control system based on virtual synchronous power generation characteristics provided by the invention is as shown in Figure 6 and Figure 7, wherein Fig. 6 is the output waveform of the busbar voltage of DC side and photovoltaic system, Fig. 7 be light storage integral system grid-connected time output current wave, the current waveform of output meets quality of power supply requirement.
Finally should be noted that: above example is only in order to illustrate that technical scheme is not intended to limit; although the present invention being described in detail with reference to above-described embodiment; those of ordinary skill in the field are it is understood that still can modify to the specific embodiment of the present invention or equivalent replacement; and without departing from any amendment of spirit and scope of the invention or equivalent replace, it all should be encompassed within the claims of the present invention.
Claims (8)
1. the light based on virtual synchronous power generation characteristics stores up integral control system, it is characterised in that described system includes:
At least two generator unit, DC converting unit, exchange conversion unit, measuring unit, light storage overall-in-one control schema unit, control processing unit and virtual synchronous generation control unit, wherein, described generator unit is photovoltaic generation unit or energy-storage units, and described at least two generator unit at least includes a photovoltaic generation unit and an energy-storage units；
Described generator unit is connected with described DC converting unit and exchange conversion unit successively, described measuring unit connecting line respectively and between described generator unit and described DC converting unit, connecting line between described DC converting unit and described exchange conversion unit, connecting line and described light storage overall-in-one control schema unit between described exchange conversion unit and transmission line of electricity are connected, described light storage overall-in-one control schema unit is connected with described control processing unit and described virtual synchronous generation control unit respectively, described control processing unit is connected with described DC converting unit, described virtual synchronous generation control unit is connected with described exchange conversion unit.
2. the system as claimed in claim 1, it is characterized in that, described DC converting unit is two-way BOOST/BUCK circuit, including: reactance filter circuit L that the first dc bus outfan, the second dc bus outfan and described generator unit are corresponding, capacitor filtering loop C, switching device G1 and G2；
The reactance filter circuit L that first output port of described generator unit is corresponding with the described generator unit in described DC converting unit successively, switching device G1 and the first dc bus outfan that described generator unit is corresponding connect, second output port of described generator unit connects the second dc bus outfan by dc bus transmission line, junction point between the switching device G1 corresponding with described generator unit for reactance filter circuit L that described generator unit is corresponding and be connected capacitor filtering loop C between described dc bus transmission line, junction point between the reactance filter circuit L that first output port of described generator unit is corresponding with the described generator unit in described DC converting unit and be connected, between described dc bus transmission line, the switching device G2 that described generator unit is corresponding.
3. the system as claimed in claim 1, it is characterized in that, described measuring unit, is used for the DC bus-bar voltage Vdc, energy-storage units input side DC voltage Udc and electric current Idc, photovoltaic generation unit input side DC voltage Udc_1 and electric current Idc_1 and described exchange conversion unit outlet side voltage U, frequency f, active power measured value P and the reactive power measured value Q that measure between described DC converting unit and described exchange conversion unit.
4. the system as claimed in claim 1, it is characterised in that described exchange conversion unit includes: isolating transformer T1, three-phase LC wave filter and three phase full bridge current transformer；
The DC side of described three phase full bridge current transformer connects the first dc bus outfan and the second dc bus outfan of described DC converting unit respectively, and the AC of described three phase full bridge current transformer passes sequentially through described three-phase LC wave filter and isolating transformer T1 accesses electrical network.
5. the system as claimed in claim 1, it is characterized in that, described light storage overall-in-one control schema unit, the part adopting the energy-storage units input to accessing in described DC converting unit of the constant voltage control mode for controlling described control processing unit processes, then adopt MPPT control mode that the photovoltaic generation unit importation accessed in described DC converting unit is processed, finally control described virtual synchronous generation control unit and described exchange conversion unit is processed.
6. system as claimed in claim 5, it is characterised in that described light storage overall-in-one control schema unit, adopts the part of the constant voltage control mode energy-storage units input to accessing in described DC converting unit to process for controlling processing unit, including:
nullDC bus-bar voltage Vdc between DC bus-bar voltage set-point Vref and described DC converting unit and described exchange conversion unit is exported the first signal through first adder，The described first information is the Vref signal subtracting Vdc，And by DC voltage controller output internal ring given value of current value Iref，Described internal ring given value of current value Iref exports secondary signal and the 3rd signal respectively through second adder and the 3rd adder，Described secondary signal is the described internal ring given value of current value Iref signal subtracting described energy-storage units input side DC current Idc，Described 3rd information is the described energy-storage units input side DC current Idc signal subtracting described internal ring given value of current value Iref，Described second information is exported discharge pulse signal through DC voltage controller and duty cycle adjustment device successively，Described 3rd information is exported charge pulse signal through DC voltage controller and duty cycle adjustment device successively，DC bus-bar voltage Vdc between DC bus-bar voltage set-point Vref and described DC converting unit and described exchange conversion unit is compared by Enable Pin through comparator，When Vref and Vdc fiducial value is more than 0，Discharge pulse enables，Namely the switching device G2 output that in described DC converting unit, generator unit is corresponding enables，When Vref and Vdc fiducial value is less than 0，Charging pulse enables，Namely the switching device G1 output that in described DC converting unit, generator unit is corresponding enables.
7. system as claimed in claim 5, it is characterised in that described light storage overall-in-one control schema unit, adopts MPPT control mode that the photovoltaic generation unit importation accessed in described DC converting unit is processed for controlling described control processing unit, including:
Described control processing unit adopts MPPT control mode to obtain the maximum generation power P _ max of the photovoltaic generation unit accessed in described DC converting unit, the described photovoltaic generation unit input side DC voltage that described maximum generation power P _ max is corresponding is carried out Isobarically Control, exports pwm pulse to described DC converting unit.
8. system as claimed in claim 5, it is characterised in that described light storage overall-in-one control schema unit, is used for controlling the described control processing unit described virtual synchronous generation control unit of control and described exchange conversion unit is processed, including:
Artificial setpoint frequency set-point fref, voltage set-point Uref, active power set-point Pref and reactive power set-point Qref；
Described frequency set-point fref and described exchange conversion unit outlet side frequency f is exported the 4th signal △ f through the 4th adder, wherein, △ f=fref-f, more described 4th signal △ f is amplified output torque change signal △ T through coefficient of frequency kf；
By described exchange conversion unit outlet side active power measured value P through droop control active power of output droop signal, described active power droop signal is exported the 5th signal with described active power set-point Pref through fifth adder, wherein, described five signals=Pref-active power droop signal, again by described 5th signal through the meritorious initial dtc signal T0 of divider output, wherein, the division factor of described divider is angular frequency；
Described torque change signal △ T is exported virtual machine torque value Tm with described meritorious initial dtc signal T0 through the 6th adder, wherein, Tm=△ T-T0；
Described voltage set-point Uref and described exchange conversion unit outlet side voltage U is exported the 7th signal through the 7th adder, wherein, described seven signals=Uref-U, more described 7th signal is amplified output excitation voltage variable quantity △ Eu through voltage coefficient ku；
By described exchange conversion unit outlet side reactive power measured value Q through droop control output reactive power droop signal, described reactive power droop signal is exported the 8th signal with described reactive power set-point Qref through the 8th adder, wherein, described 8th signal is idle potential change amount △ Eq, △ Eq=Qref-reactive power droop signal；
By described excitation voltage variable quantity △ Eu and described idle potential change amount △ Eq through the 9th adder output electricity excitation voltage value E, wherein, E=△ Eu-△ Eq；
Respectively by described virtual machine torque value Tm and electricity excitation voltage value E by machine torque actuator and electricity field regulator input to PWM controller.
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