CN108494023B - Active power output control system and method for photovoltaic power station - Google Patents
Active power output control system and method for photovoltaic power station Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000010248 power generation Methods 0.000 claims abstract description 98
- 238000004146 energy storage Methods 0.000 claims abstract description 40
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- 239000003990 capacitor Substances 0.000 claims description 48
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/48—Controlling the sharing of the in-phase component
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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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
- H02J7/345—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering using capacitors as storage or buffering devices
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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
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
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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
Abstract
The invention discloses a photovoltaic power station active power output control system and method, which comprises the following steps: 1) calculating the active sensitivity and the total sensitivity of each photovoltaic power generation unit grid-connected point in the photovoltaic system; 2) determining a P (U) strategy algorithm according to the sensitivity, acquiring a grid-connected point voltage U and outputting the load required power P of the photovoltaic power station through the P (U) strategy algorithm; 3) the load demand power P of the photovoltaic power station and the photovoltaic power generation unit Ppvmax are processed by a subtracter to determine whether an electric energy storage device is put into and output active power; 4) determining the time for putting different electric energy storage devices into a system according to the time for the load to demand power; 5) and controlling the photovoltaic power station to output active power according to the determined number of the photovoltaic power generation units put into the photovoltaic power station and the time of putting the electric energy storage device into the system. The invention can safely and efficiently control the output of the photovoltaic power station.
Description
Technical Field
The application belongs to the technical field of new energy power supply, and particularly relates to a photovoltaic power station active power output control system and method.
Background
In recent years, with the continuous reduction of the cost of a photovoltaic system and the maturity of a photovoltaic grid-connected technology, large-scale photovoltaic power generation is more and more favored by the international society. The large-scale photovoltaic power station is generally established in remote areas with abundant solar energy resources, and can more intensively utilize solar energy and control and manage the parallel inverters compared with medium and small photovoltaic systems. However, as the proportion of photovoltaic power generation in a power grid power supply is increased, photovoltaic power needs to be transmitted to a load center in a long distance, and a photovoltaic system has an adverse effect on the voltage stability of the power grid. Some photovoltaic systems only adopt constant power control, solve the problem that the grid voltage is out of limit caused by photovoltaic access, but only can realize one-way drop output operation. Some energy storage devices are used for inhibiting the influence of the fluctuation of the active power output of the photovoltaic system on the voltage stability of the power grid, but additional energy storage devices and complex control technologies are needed.
Because the photovoltaic power supply has instability and randomness along with time change, the stability of the active power output of the photovoltaic power station cannot be effectively guaranteed, so that the photovoltaic power station cannot meet the load requirement in a self-adaptive manner, and particularly when high-power electric energy is provided for the load in a required period, the photovoltaic power station is easy to run at full load or in a super-coincidence manner, and the safety and the service life of the photovoltaic power station are seriously influenced.
Disclosure of Invention
In order to solve the technical problems: the application provides a photovoltaic power station active power output control method, which comprises the following steps:
1) calculating the active sensitivity and the total sensitivity of each photovoltaic power generation unit grid-connected point in the photovoltaic system;
2) determining a P (U) strategy algorithm according to the sensitivity, acquiring a grid-connected point voltage U and outputting the load required power P of the photovoltaic power station through the P (U) strategy algorithm;
3) the load demand power P of the photovoltaic power station and the photovoltaic power generation unit Ppvmax are processed by a subtracter to determine whether an electric energy storage device is put into and output active power;
4) determining the time for putting different electric energy storage devices into a system according to the time for the load to demand power;
5) and controlling the photovoltaic power station to output active power according to the determined number of the photovoltaic power generation units put into the photovoltaic power station and the time of putting the electric energy storage device into the system.
In the active power output control method for the photovoltaic power station, the strategy algorithm P (U) is performed by adopting the following formula:
wherein Pmax is the maximum power which can be output by the photovoltaic power station and comprises the total output power value of the photovoltaic power generation units and the maximum value which can be output by the electric energy storage device, U1, U2, U3 and U4 are preset voltage threshold values of the output voltage of the photovoltaic power station,
for the active sensitivity at the grid connection point of the nth photovoltaic power generation unit,
the Pc is the maximum power which can be output by the nth photovoltaic power generation unit, and is the active output value of the electric energy storage device.
The active power output control method of the photovoltaic power station has the total sum of active sensitivities
Wherein n is the number of the photovoltaic power generation units connected in parallel,
the sensitivity of the active output of the ith photovoltaic power generation unit to the voltage amplitude of the grid-connected point, wherein,
。
according to the active output control method of the photovoltaic power station, the electric energy storage device comprises a super capacitor, an electrolytic capacitor and a storage battery.
The active output control method of the photovoltaic power station comprises Pmax = Pcmax + Pbmax + Ppvmax,
Pcmax=Uc*Ic*tc,
Pbmax= Ub*Ib*tb，
wherein, Pcmax is the maximum power value which can be output by the super capacitor, Pbmax is the maximum power value which can be output by the storage battery, Ppvmax is the maximum power value which can be output by the photovoltaic power generation unit; uc and Ic are respectively the voltage and current value which can be output by the super capacitor, tc is the discharge time of the super capacitor, Ub and Ib are respectively the voltage and current value which can be output by the storage battery, tb is the discharge time of the storage battery,
for the active sensitivity at the grid connection point of the nth photovoltaic power generation unit,
is the maximum power that the nth photovoltaic power generation unit can output, tc<tb。
The active power output control method of the photovoltaic power station,
when P is multiplied by < Ppvmax, the active output of the photovoltaic power station is completely supplied with power by the photovoltaic power generation unit;
when P is greater than Ppvmax, (P is greater than Ppvmax) < Pcmax, the active output of the photovoltaic power station is completely supplied with power by the photovoltaic power generation unit and the super capacitor;
when the required power supply time t is greater than tb, the active output of the photovoltaic power station is Pmax;
when the required power supply time tc is less than t and less than tb, the photovoltaic power generation unit and the super capacitor supply power for the time tc, and then the photovoltaic power generation unit and the storage battery supply power for the time tb-tc;
when power supply time t is required<And tc, calculating a power value Pt = Ppvmax + t Pcmax/tc of the photovoltaic power generation unit and the super capacitor during power supply t, and then calculating a current value of a power value required to be output by the storage battery
,
And comparing the magnitude of Ibt with Ib, if Ibt > Ib, outputting warning information, and simultaneously controlling the storage battery to output current according to the Ib current value, and if Ibt < Ib or Ibt = Ib, controlling the storage battery to output current according to the Ibt current value.
A photovoltaic power plant active output control system comprising:
the sensitivity determining module is used for calculating the active sensitivity and the sensitivity sum of grid-connected points of all photovoltaic power generation units in the photovoltaic system;
the output calculation module is used for determining a P (U) strategy algorithm according to the sensitivity;
the output demand determining module is used for acquiring the voltage U of the grid-connected point and outputting the load demand power P of the photovoltaic power station through a P (U) strategy algorithm;
the photovoltaic power station output device determining module is used for processing the photovoltaic power station load required power P and the photovoltaic power generation unit Ppvmax through a subtracter to determine whether the electric energy storage device is put into and outputs active power;
the input time calculation module is used for determining the time of inputting different electric energy storage devices into the system according to the time of the power demand of the load;
and the control module is used for controlling the photovoltaic power station to output active power according to the determined number of the photovoltaic power generation units put into the photovoltaic power station and the time of putting the electric energy storage device into the system.
The active power output control system of the photovoltaic power station comprises n photovoltaic power generation units connected in parallel, at least two super capacitors connected in parallel and at least two storage batteries connected in parallel.
The photovoltaic power station active power output control system is characterized in that the photovoltaic power station output device determining module determines whether a photovoltaic power generation unit, a super capacitor and a storage battery are put into operation to provide active power, and determines the specific quantity of the put into operation, wherein the step of determining the put into operation specifically comprises the following steps: a power calculation module for calculating Pmax = Pcmax + Pbmax + Ppvmax,
Pcmax=Uc*Ic*tc,
Pbmax= Ub*Ib*tb，
wherein, Pcmax is the maximum power value which can be output by the super capacitor, Pbmax is the maximum power value which can be output by the storage battery, Ppvmax is the maximum power value which can be output by the photovoltaic power generation unit; uc and Ic are respectively the voltage and current value which can be output by the super capacitor, tc is the discharge time of the super capacitor, Ub and Ib are respectively the voltage and current value which can be output by the storage battery, tb is the discharge time of the storage battery,
for the active sensitivity at the grid connection point of the nth photovoltaic power generation unit,
is the maximum power that the nth photovoltaic power generation unit can output, tc<tb。
The active power output control system of the photovoltaic power station comprises an input time calculation module and a control module, wherein the input time calculation module specifically comprises: when P is multiplied by < Ppvmax, the active output of the photovoltaic power station is completely supplied with power by the photovoltaic power generation unit;
when P is greater than Ppvmax, (P is greater than Ppvmax) < Pcmax, the active output of the photovoltaic power station is completely supplied with power by the photovoltaic power generation unit and the super capacitor;
when the required power supply time t is greater than tb, the active output of the photovoltaic power station is Pmax;
when the required power supply time tc is less than t and less than tb, the photovoltaic power generation unit and the super capacitor supply power for the time tc, and then the photovoltaic power generation unit and the storage battery supply power for the time tb-tc;
when power supply time t is required<And tc, calculating a power value Pt = Ppvmax + t Pcmax/tc of the photovoltaic power generation unit and the super capacitor during power supply t, and then calculating a current value of a power value required to be output by the storage battery
,
And comparing the magnitude of Ibt with Ib, if Ibt > Ib, outputting warning information, and simultaneously controlling the storage battery to output current according to the Ib current value, and if Ibt < Ib or Ibt = Ib, controlling the storage battery to output current according to the Ibt current value.
The method and the device can flexibly control the output of the active power according to the load requirement of the photovoltaic power station, particularly, when the photovoltaic power generation unit of the photovoltaic power station is insufficient, the device is matched with the electric energy storage device to carry out rapid power output, the power supply time and the power supply efficiency value of the photovoltaic power station are maintained to the maximum extent, and the power supply time requirement of the load is met according to the matching of the photovoltaic power generation unit and the electric energy storage device; meanwhile, the power supply of the electric energy storage device is controlled within a safe range by considering safety factors and preventing the electric energy storage device from running in an overload mode.
Drawings
Fig. 1 is a schematic diagram of an active power output control method of a photovoltaic power station according to the present application.
Fig. 2 is a schematic diagram of an active power output control system of a photovoltaic power station according to the present application.
Detailed Description
The present application will now be described in further detail with reference to the drawings, it should be noted that the following detailed description is given for illustrative purposes only and is not to be construed as limiting the scope of the present application, as those skilled in the art will be able to make numerous insubstantial modifications and adaptations to the present application based on the above disclosure.
Fig. 1 shows a schematic diagram of an active output control method for a photovoltaic power station, which includes the following steps:
1) calculating the active sensitivity and the total sensitivity of each photovoltaic power generation unit grid-connected point in the photovoltaic system;
2) determining a P (U) strategy algorithm according to the sensitivity, acquiring a grid-connected point voltage U and outputting the load required power P of the photovoltaic power station through the P (U) strategy algorithm;
3) the load demand power P of the photovoltaic power station and the photovoltaic power generation unit Ppvmax are processed by a subtracter to determine whether an electric energy storage device is put into and output active power;
4) determining the time for putting different electric energy storage devices into a system according to the time for the load to demand power;
5) and controlling the photovoltaic power station to output active power according to the determined number of the photovoltaic power generation units put into the photovoltaic power station and the time of putting the electric energy storage device into the system.
In the active power output control method for the photovoltaic power station, the strategy algorithm P (U) is performed by adopting the following formula:
wherein Pmax is the maximum power which can be output by the photovoltaic power station and comprises the total output power value of the photovoltaic power generation units and the maximum value which can be output by the electric energy storage device, U1, U2, U3 and U4 are preset voltage threshold values of the output voltage of the photovoltaic power station,
for the active sensitivity at the grid connection point of the nth photovoltaic power generation unit,
the Pc is the maximum power which can be output by the nth photovoltaic power generation unit, and is the active output value of the electric energy storage device.
The active power output control method of the photovoltaic power station has the total sum of active sensitivities
Wherein n is the number of the photovoltaic power generation units connected in parallel,
the sensitivity of the active output of the ith photovoltaic power generation unit to the voltage amplitude of the grid-connected point, wherein,
。
according to the active output control method of the photovoltaic power station, the electric energy storage device comprises a super capacitor, an electrolytic capacitor and a storage battery.
The active output control method of the photovoltaic power station comprises Pmax = Pcmax + Pbmax + Ppvmax,
Pcmax=Uc*Ic*tc,
Pbmax= Ub*Ib*tb，
wherein, Pcmax is the maximum power value which can be output by the super capacitor, Pbmax is the maximum power value which can be output by the storage battery, Ppvmax is the maximum power value which can be output by the photovoltaic power generation unit; uc and Ic are respectively the voltage and current value which can be output by the super capacitor, tc is the discharge time of the super capacitor, Ub and Ib are respectively the voltage and current value which can be output by the storage battery, tb is the discharge time of the storage battery,
for the active sensitivity at the grid connection point of the nth photovoltaic power generation unit,
is the maximum power that the nth photovoltaic power generation unit can output, tc<tb。
The active power output control method of the photovoltaic power station,
when P is multiplied by < Ppvmax, the active output of the photovoltaic power station is completely supplied with power by the photovoltaic power generation unit;
when P is greater than Ppvmax, (P is greater than Ppvmax) < Pcmax, the active output of the photovoltaic power station is completely supplied with power by the photovoltaic power generation unit and the super capacitor;
when the required power supply time t is greater than tb, the active output of the photovoltaic power station is Pmax;
when the required power supply time tc is less than t and less than tb, the photovoltaic power generation unit and the super capacitor supply power for the time tc, and then the photovoltaic power generation unit and the storage battery supply power for the time tb-tc;
when power supply time t is required<And tc, calculating a power value Pt = Ppvmax + t Pcmax/tc of the photovoltaic power generation unit and the super capacitor during power supply t, and then calculating a current value of a power value required to be output by the storage battery
,
And comparing the magnitude of Ibt with Ib, if Ibt > Ib, outputting warning information, and simultaneously controlling the storage battery to output current according to the Ib current value, and if Ibt < Ib or Ibt = Ib, controlling the storage battery to output current according to the Ibt current value.
As shown in fig. 2, a schematic diagram of an active output control system of a photovoltaic power station according to the present application includes:
the sensitivity determining module is used for calculating the active sensitivity and the sensitivity sum of grid-connected points of all photovoltaic power generation units in the photovoltaic system;
the output calculation module is used for determining a P (U) strategy algorithm according to the sensitivity;
the output demand determining module is used for acquiring the voltage U of the grid-connected point and outputting the load demand power P of the photovoltaic power station through a P (U) strategy algorithm;
the photovoltaic power station output device determining module is used for processing the photovoltaic power station load required power P and the photovoltaic power generation unit Ppvmax through a subtracter to determine whether the electric energy storage device is put into and outputs active power;
the input time calculation module is used for determining the time of inputting different electric energy storage devices into the system according to the time of the power demand of the load;
and the control module is used for controlling the photovoltaic power station to output active power according to the determined number of the photovoltaic power generation units put into the photovoltaic power station and the time of putting the electric energy storage device into the system.
The active power output control system of the photovoltaic power station comprises n photovoltaic power generation units connected in parallel, at least two super capacitors connected in parallel and at least two storage batteries connected in parallel.
The photovoltaic power station active power output control system is characterized in that the photovoltaic power station output device determining module determines whether a photovoltaic power generation unit, a super capacitor and a storage battery are put into operation to provide active power, and determines the specific quantity of the put into operation, wherein the step of determining the put into operation specifically comprises the following steps: a power calculation module for calculating Pmax = Pcmax + Pbmax + Ppvmax,
Pcmax=Uc*Ic*tc,
Pbmax= Ub*Ib*tb，
wherein, Pcmax is the maximum power value which can be output by the super capacitor, Pbmax is the maximum power value which can be output by the storage battery, Ppvmax is the maximum power value which can be output by the photovoltaic power generation unit; uc and Ic are respectively the voltage and current value which can be output by the super capacitor, tc is the discharge time of the super capacitor, Ub and Ib are respectively the voltage and current value which can be output by the storage battery, tb is the discharge time of the storage battery,
for the active sensitivity at the grid connection point of the nth photovoltaic power generation unit,
is the maximum power that the nth photovoltaic power generation unit can output, tc<tb。
The active power output control system of the photovoltaic power station comprises an input time calculation module and a control module, wherein the input time calculation module specifically comprises: when P is multiplied by < Ppvmax, the active output of the photovoltaic power station is completely supplied with power by the photovoltaic power generation unit;
when P is greater than Ppvmax, (P is greater than Ppvmax) < Pcmax, the active output of the photovoltaic power station is completely supplied with power by the photovoltaic power generation unit and the super capacitor;
when the required power supply time t is greater than tb, the active output of the photovoltaic power station is Pmax;
when the required power supply time tc is less than t and less than tb, the photovoltaic power generation unit and the super capacitor supply power for the time tc, and then the photovoltaic power generation unit and the storage battery supply power for the time tb-tc;
when power supply time t is required<And tc, calculating a power value Pt = Ppvmax + t Pcmax/tc of the photovoltaic power generation unit and the super capacitor during power supply t, and then calculating a current value of a power value required to be output by the storage battery
,
And comparing the Ibt with the Ib, if the Ibt is larger than the Ib, outputting warning information, and simultaneously controlling the storage battery to output according to the Ib current value.
The control module transmits the (Ibt-Ib) Ub to a load demand terminal by converting it into a digital code, selects by a user whether to reserve the part of power, transmits a verification if the user selects to reserve the part of power, provides whether the user can extend the power supply time, calculates the extended specific time,
and sending the specific extension time t1 to a user, executing extension operation if the user determines extension, and if the user selects no extension, emergently calling the power of the (Ibt-Ib) Ub through the power grid, or starting emergency calling of the standby power supply of the photovoltaic power station, and after finishing the emergency calling, rapidly supplementing energy to the standby power supply, or feeding back the partial power of the power grid.
And if Ibt < Ib or Ibt = Ib, controlling the storage battery to output current according to the Ibt current value.
The method and the device can flexibly control the output of the active power according to the load requirement of the photovoltaic power station, particularly, when the photovoltaic power generation unit of the photovoltaic power station is insufficient, the device is matched with the electric energy storage device to carry out rapid power output, the power supply time and the power supply efficiency value of the photovoltaic power station are maintained to the maximum extent, and the power supply time requirement of the load is met according to the matching of the photovoltaic power generation unit and the electric energy storage device; meanwhile, the power supply of the electric energy storage device is controlled within a safe range by considering safety factors and preventing the electric energy storage device from running in an overload mode. The photovoltaic power generation system can self-adaptively coordinate the power demand of the load while fully utilizing the photovoltaic power generation unit, simultaneously ensure the safe operation of the photovoltaic power station, and effectively prolong the service life of the photovoltaic power station.
Claims (2)
1. A photovoltaic power station active power output control method is characterized by comprising the following steps: the method comprises the following steps:
1) calculating the active sensitivity and the total sensitivity of each photovoltaic power generation unit grid-connected point in the photovoltaic system;
2) determining a P (U) strategy algorithm according to the sensitivity, acquiring a grid-connected point voltage U and outputting the load required power P of the photovoltaic power station through the P (U) strategy algorithm;
3) processing the load demand power P of the photovoltaic power station and the maximum output power Ppvmax of the photovoltaic power generation unit through a subtracter to determine whether the electric energy storage device is put into output and active;
4) determining the time for putting different electric energy storage devices into a system according to the time for the load to demand power;
5) controlling the photovoltaic power station to output active power according to the determined number of the photovoltaic power generation units put into the photovoltaic power station and the time of putting the electric energy storage device into the system; the P (U) policy algorithm proceeds using the following formula:
wherein Pmax is the maximum power which can be output by the photovoltaic power station, and comprises the total output power value of the photovoltaic power generation unit and the maximum value which can be output by the electric energy storage device, U1,U2, U3 and U4 are preset voltage thresholds, gamma, of the output voltage of the photovoltaic power stationnFor the active sensitivity, P, at the grid-connected point of the nth photovoltaic power generation unitnThe maximum power that the nth photovoltaic power generation unit can output is Pc, which is the active output value of the electric energy storage device; the sum of the active sensitivities is
Wherein n is the number of the photovoltaic power generation units connected in parallel, SVPiSensitivity of the active output of the ith photovoltaic power generation unit to the voltage amplitude of the grid-connected point; (ii) a The electric energy storage device comprises a super capacitor, an electrolytic capacitor and a storage battery;
Pmax＝Pcmax+Pbmax+Ppvmax，
Pcmax＝Uc*Ic*tc,
Pbmax＝Ub*Ib*tb，
Ppvmax＝γ1P1+γ2P2+…γnPn，
wherein, Pcmax is the maximum power value which can be output by the super capacitor, Pbmax is the maximum power value which can be output by the storage battery, Ppvmax is the maximum power value which can be output by the photovoltaic power generation unit; uc and Ic are respectively the voltage and current value which can be output by the super capacitor, tc is the discharge time of the super capacitor, Ub and Ib are respectively the voltage and current value which can be output by the storage battery, tb is the discharge time of the storage battery, gammanFor the active sensitivity, P, at the grid-connected point of the nth photovoltaic power generation unitnIs the maximum power that the nth photovoltaic power generation unit can output, tc<tb；
When P is multiplied by < Ppvmax, the active output of the photovoltaic power station is completely supplied with power by the photovoltaic power generation unit;
when P is greater than Ppvmax, (P is greater than Ppvmax) < Pcmax, the active output of the photovoltaic power station is completely supplied with power by the photovoltaic power generation unit and the super capacitor;
when the required power supply time t is greater than tb, the active output of the photovoltaic power station is Pmax;
when the required power supply time tc is less than t and less than tb, the photovoltaic power generation unit and the super capacitor supply power for the time tc, and then the photovoltaic power generation unit and the storage battery supply power for the time tb-tc;
when power supply time t is required<And tc, calculating a power value Pt of the photovoltaic power generation unit and the super capacitor during power supply t time, wherein the power value Pt is Ppvmax + t Pcmax/tc, and then calculating a current value of a power value required to be output by the storage battery
Comparing Ibt with Ib, if Ibt is greater than Ib, outputting warning information, controlling the storage battery to output according to Ib current value,
and if Ibt is less than Ib or Ibt is equal to Ib, controlling the storage battery to output current according to the Ibt current value.
2. The utility model provides a photovoltaic power plant active power output control system which characterized in that: the method comprises the following steps:
the sensitivity determining module is used for calculating the active sensitivity and the sensitivity sum of grid-connected points of all photovoltaic power generation units in the photovoltaic system;
the output calculation module is used for determining a P (U) strategy algorithm according to the sensitivity;
the output demand determining module is used for acquiring the voltage U of the grid-connected point and outputting the load demand power P of the photovoltaic power station through a P (U) strategy algorithm;
the photovoltaic power station output device determining module is used for processing the load demand power P of the photovoltaic power station and the maximum output power Ppvmax of the photovoltaic power generation unit through a subtracter to determine whether the electric energy storage device is put into outputting active power;
the input time calculation module is used for determining the time of inputting different electric energy storage devices into the system according to the time of the power demand of the load;
the control module is used for controlling the photovoltaic power station to output active power according to the determined number of the photovoltaic power generation units put into the photovoltaic power station and the time of putting the electric energy storage device into the system; the photovoltaic power station comprises n photovoltaic power generation units connected in parallel, at least two super capacitors connected in parallel and at least two storage batteries connected in parallel; the photovoltaic power station output device determining module determines whether a photovoltaic power generation unit, a super capacitor and a storage battery are put into operation to provide active power, and determines the specific quantity of the put into operation, wherein the step of determining the put into operation specifically comprises the following steps: a power calculation module for calculating Pmax ═ Pcmax + Pbmax + Ppvmax,
Pcmax＝Uc*Ic*tc,
Pbmax＝Ub*Ib*tb，
Ppvmax＝γ1P1+γ2P2+…γnPn，
wherein, Pcmax is the maximum power value which can be output by the super capacitor, Pbmax is the maximum power value which can be output by the storage battery, Ppvmax is the maximum power value which can be output by the photovoltaic power generation unit; uc and Ic are respectively the voltage and current value which can be output by the super capacitor, tc is the discharge time of the super capacitor, Ub and Ib are respectively the voltage and current value which can be output by the storage battery, tb is the discharge time of the storage battery, gammanFor the active sensitivity, P, at the grid-connected point of the nth photovoltaic power generation unitnIs the maximum power that the nth photovoltaic power generation unit can output, tc<tb; the invested time calculation module specifically comprises: when P is<When Ppvmax is reached, the active output of the photovoltaic power station is completely supplied with power by the photovoltaic power generation unit;
when P is greater than Ppvmax, (P is greater than Ppvmax) < Pcmax, the active output of the photovoltaic power station is completely supplied with power by the photovoltaic power generation unit and the super capacitor;
when the required power supply time t is greater than tb, the active output of the photovoltaic power station is Pmax;
when the required power supply time tc is less than t and less than tb, the photovoltaic power generation unit and the super capacitor supply power for the time tc, and then the photovoltaic power generation unit and the storage battery supply power for the time tb-tc;
when power supply time t is required<And tc, calculating a power value Pt of the photovoltaic power generation unit and the super capacitor during power supply t time, wherein the power value Pt is Ppvmax + t Pcmax/tc, and then calculating a current value of a power value required to be output by the storage battery
Comparing Ibt with Ib, if Ibt is greater than Ib, outputting warning information, controlling the storage battery to output according to Ib current value,
and if Ibt is less than Ib or Ibt is equal to Ib, controlling the storage battery to output current according to the Ibt current value.
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