CN112103962A - Grid-connected point voltage control method and system of movable light storage system - Google Patents

Grid-connected point voltage control method and system of movable light storage system Download PDF

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CN112103962A
CN112103962A CN202011283774.1A CN202011283774A CN112103962A CN 112103962 A CN112103962 A CN 112103962A CN 202011283774 A CN202011283774 A CN 202011283774A CN 112103962 A CN112103962 A CN 112103962A
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storage system
grid
voltage
optical storage
compensation
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CN112103962B (en
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吴福保
杨波
余豪杰
李官军
陶以彬
李浩源
殷实
周晨
庄俊
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China Online Shanghai Energy Internet Research Institute Co ltd
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China Electric Power Research Institute Co Ltd CEPRI
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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
    • H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
    • 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
    • H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
    • H02J3/16—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by adjustment of reactive power
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
    • 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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/381—Dispersed generators
    • 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
    • H02J3/466—Scheduling the operation of the generators, e.g. connecting or disconnecting generators to meet a given demand
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
    • H02J2203/10—Power transmission or distribution systems management focussing at grid-level, e.g. load flow analysis, node profile computation, meshed network optimisation, active network management or spinning reserve management
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
    • H02J2300/20—The dispersed energy generation being of renewable origin
    • H02J2300/22—The renewable source being solar energy
    • H02J2300/24—The renewable source being solar energy of photovoltaic origin
    • 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
    • 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
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/30—Reactive power compensation

Abstract

The invention discloses a grid-connected point voltage control method and a grid-connected point voltage control system of a movable light storage system, wherein the grid-connected point voltage control method comprises the following steps: acquiring the voltage of a grid-connected point at the current moment and the voltage of a movable light storage system access point; when the grid-connected point voltage enters a set compensation interval, determining the apparent power output value of the optical storage system at the next moment based on the voltage of the grid-connected point at the current moment and the voltage of the access point of the optical storage system; and determining a control strategy for the optical storage system based on the relation between the apparent power output value and the maximum capacity of the optical storage system, and the output power of the optical storage system under the control strategy. The invention can combine the self power output capability of the optical storage system when entering a set compensation interval according to the voltage deviation of the grid-connected point, continuously adjust the output power of the optical storage system according to the apparent power output value of the optical storage system at the next moment, realize the active support of the grid-connected point voltage and improve the power supply quality of the tail end of the power distribution network.

Description

Grid-connected point voltage control method and system of movable light storage system
Technical Field
The invention relates to the field of grid connection of distributed power supplies, in particular to a grid connection point voltage control method and a grid connection point voltage control system of a movable light storage system.
Background
The rapid development of renewable energy sources such as wind energy, solar energy and the like is an important strategic measure for adjusting energy structures in set areas and realizing energy conservation and emission reduction. With the increasing of the installed proportion of the distributed new energy, the network structure of the power system is changed, the influence of the fluctuation of the network structure on the power grid is more obvious, and particularly in areas with high wind power and photovoltaic permeability, the grid structure of the power distribution network is weak, and the problems of voltage fluctuation and the like often occur. Meanwhile, the types of electric loads are continuously increased, and local areas have obvious seasonal and time-interval characteristics, so that the tail end voltage is low, and the power factor is poor. The voltage fluctuation not only affects the safe and stable operation of a large power grid, but also seriously affects the energy consumption quality of users. At present, the main method for improving the voltage stability at the tail end of a power distribution network and reducing the voltage deviation is to adopt a reactive compensation device or a static synchronous compensator to solve the problem of the quality of the electric energy of a grid-connected point, but the method has larger delay due to the processes of data acquisition and data transmission and is difficult to meet the requirement of controlling the real-time property. In addition, when the voltage fluctuation is large, frequent switching-in and switching-out of the compensation device can be caused, the service life of equipment and the stability of a system are influenced, and meanwhile, the engineering construction cost is increased by adding the reactive compensation device. At present, a wind-solar energy storage coordination control strategy considering energy storage charge state is also provided aiming at three different application requirements of smooth power fluctuation, tracking planned output and power grid frequency modulation, but the control strategy does not provide a solution for the voltage fluctuation problem and the power factor problem of a grid-connected point.
Disclosure of Invention
In order to solve the above-mentioned deficiencies in the prior art, the present invention provides a method for controlling a grid-connected point voltage of a movable light storage system, comprising:
acquiring the voltage of a grid-connected point at the current moment and the voltage of a movable light storage system access point;
when the grid-connected point voltage enters a set compensation interval, determining the apparent power output value of the optical storage system at the next moment based on the voltage of the grid-connected point at the current moment and the voltage of the access point of the optical storage system;
and determining a control strategy for the optical storage system based on the relation between the apparent power output value and the maximum capacity of the optical storage system, and the output power of the optical storage system under the control strategy.
Preferably, the determining the apparent power output value of the light storage system at the next moment based on the voltage of the grid-connected point at the current moment and the voltage of the access point of the light storage system includes:
respectively determining a reactive compensation value when reactive compensation is adopted and an active compensation value when active compensation is adopted at the current moment based on the voltage of the grid-connected point at the current moment and the voltage of the access point of the optical storage system;
determining the apparent power output value of the optical storage system at the next moment based on the reactive compensation value and the active compensation value at the current moment;
the apparent power output values include: an apparent active power output value and an apparent reactive power output value.
Preferably, the apparent power output value of the optical storage system at the next moment is determined according to the following formula:
Figure 176870DEST_PATH_IMAGE001
in the formula:S B-P (t +1) is the apparent active power output value of the optical storage system at the next moment;P B （t) As the current timetActive power of the optical storage system;P com （t) As the current timetActive compensation value of (1);S B-Q (t +1) is the apparent reactive power output value of the optical storage system at the next moment;Q B （t) As the current timetReactive power of the optical storage system;Q com （t) As the current timetThe reactive compensation value of (2).
Preferably, the control strategy of the light storage system includes:
when in useS B-P （t +1）≤ S maxAnd isS B-Q （t +1）≤ S maxIn the process, active compensation and reactive compensation aiming at optimizing the power factor of a grid-connected point are adopted or are simultaneously carried out;
when in useS B-P （t +1）>S maxAnd isS B-Q （t +1）>S maxIn time, adopting power compensation aiming at reducing voltage deviation of a grid-connected point;
when in useS B-P （t +1）< S maxAnd isS B-Q （t +1）>S maxIn time, active compensation aiming at reducing the voltage deviation of the grid-connected point is adopted;
when in useS B-P （t +1）>S maxAnd isS B-Q （t +1）< S max In time, reactive compensation aiming at reducing voltage deviation of a grid connection point is adopted;
whereinS B-P (t +1) light store at the next momentApparent active power output value of the system;S B-Q (t +1) is the apparent reactive power output value of the optical storage system at the next moment;S maxis the maximum capacity of the optical storage system in the optical storage system.
Preferably, the active compensation, the reactive compensation or the simultaneous active compensation and reactive compensation with the aim of optimizing the power factor of the grid-connected point includes:
when the reactive compensation is executed, if the reactive compensation direction is different from the reactive direction of the current grid-connected point, calculating the reactive output power of the optical storage system according to the reactive compensation power and the current reactive power of the grid-connected point according to a first calculation formula, otherwise, keeping the current reactive power output;
and when the active compensation is executed, calculating the active output power of the optical storage system according to the second calculation formula.
Preferably, the first calculation formula is as follows:
Figure 647166DEST_PATH_IMAGE002
in the formula:Q B-ref （t) For the light-storing system at the current momenttThe reactive output power of (a);Q com （t) As the current timetThe reactive compensation value of (a); q A （t) The reactive power at the grid-connected point at the current moment is obtained; q B （t) The reactive power of the optical storage system at the current moment.
Preferably, the second calculation formula is as follows:
Figure 236279DEST_PATH_IMAGE003
in the formula:P B-ref （t) As the current timetThe active output power of the optical storage system; Δ U: (t) As the current timetDeviation of grid-connected point voltage from rated voltage; u shapeA（t) As the current timetVoltage of grid point；Q A-ref （t) After compensation for grid-connected point at current momenttThe reactive output power of (a);P A （t) As the current timetThe active power of the grid-connected point;P B （t) As the current timetActive power of the light storage system.
Preferably, the power compensation aiming at reducing the voltage deviation of the grid-connected point includes:
calculating an active power output value of the optical storage system according to a third calculation formula;
calculating a reactive power output value of the optical storage system according to a fourth calculation formula;
and compensating the voltage of the grid-connected point based on the active power output value and the reactive power output value.
Preferably, the third calculation formula:
Figure 108420DEST_PATH_IMAGE004
in the formula:P B-ref （t) As the current timetThe active output power of the optical storage system;P com-max （t) As the current timetThe upper limit of active compensation; delta U P （t+1) istAfter only active power compensation is carried out at any momentt A voltage deviation value at +1 time; delta U Q （t +1) istAfter only carrying out reactive compensation at any momentt A voltage deviation value at +1 time;P A （t) As the current timetActive power of the point of connection.
Preferably, the fourth calculation formula:
Figure 367363DEST_PATH_IMAGE005
in the formula:Q B-ref （t) For the light-storing system at the current momenttThe reactive output power of (a); q A （t) For current moment synchronizationReactive power at a point; delta U P （t+1) istAfter only active power compensation is carried out at any momentt A voltage deviation value at +1 time; delta U Q （t +1) istAfter only carrying out reactive compensation at any momentt A voltage deviation value at +1 time;Q com-max （t) As the current timetThe upper limit of reactive compensation.
Preferably, the active compensation aiming at reducing the voltage deviation of the grid-connected point includes:
the light storage system outputs an active compensation value at the current moment and outputs reactive power at the current moment.
Preferably, the reactive power compensation aiming at reducing the voltage deviation of the grid-connected point includes:
and the light storage system outputs a reactive compensation value at the current moment and outputs the active power of a grid-connected point.
Preferably, after the obtaining of the voltage of the grid-connected point at the current time and the voltage of the movable light storage system access point, and before the time when the grid-connected point voltage enters the set compensation interval, the method further includes:
when the voltage of the grid-connected point is in a set fluctuation interval, discharging is selected or surplus electricity is used for charging the light storage system according to the charge state of the light storage system;
when the voltage of the grid-connected point is in a hysteresis zone, the operation state of the last moment is kept;
wherein the fluctuation interval < hysteresis zone < compensation interval.
Based on the same inventive concept, the invention also provides a grid-connected point voltage control system of the movable light storage system, which comprises:
the acquisition module is used for acquiring the voltage of a grid-connected point at the current moment and the voltage of a movable light storage system access point;
the determining module is used for determining the apparent power output value of the optical storage system at the next moment based on the voltage of the grid-connected point at the current moment and the voltage of the access point of the optical storage system when the grid-connected point voltage enters a set compensation interval;
and the control strategy module is used for determining a control strategy of the optical storage system based on the relation between the apparent power output value and the maximum capacity of the optical storage system and the output power of the optical storage system under the control strategy.
Preferably, the determining module includes:
the first determining unit is used for respectively determining a reactive compensation value when reactive compensation is adopted and an active compensation value when active compensation is adopted at the current moment based on the voltage of the grid-connected point and the voltage of the optical storage system access point at the current moment;
and the second determining unit is used for determining the apparent power output value of the optical storage system at the next moment based on the reactive compensation value and the active compensation value at the current moment.
Compared with the prior art, the invention has the beneficial effects that:
according to the technical scheme provided by the invention, the voltage of the grid-connected point at the current moment and the voltage of the access point of the movable light storage system are obtained; when the grid-connected point voltage enters a set compensation interval, determining the apparent power output value of the optical storage system at the next moment based on the voltage of the grid-connected point at the current moment and the voltage of the access point of the optical storage system; and determining a control strategy for the optical storage system based on the relation between the apparent power output value and the maximum capacity of the optical storage system, and the output power of the optical storage system under the control strategy. The invention can combine the self power output capability of the optical storage system when entering a set compensation interval according to the voltage deviation of the grid-connected point, continuously adjust the output power of the optical storage system according to the apparent power output value of the optical storage system at the next moment, realize the active support of the grid-connected point voltage and improve the power supply quality of the tail end of the power distribution network.
Drawings
Fig. 1 is a flowchart of a method for controlling a grid-connected point voltage of a movable light storage system according to the present invention;
fig. 2 is a detailed flowchart of a method for controlling a grid-connected point voltage of a movable light storage system according to the present embodiment;
fig. 3 is an access topology diagram of the mobile optical storage system in this embodiment.
Detailed Description
For a better understanding of the present invention, reference is made to the following description taken in conjunction with the accompanying drawings and examples.
The problems of large voltage fluctuation/deviation and poor power factor in weak grid structure areas at the tail ends of the power distribution network due to the fact that the proportion of distributed power sources is increased continuously and the types of power loads are increased continuously are solved through the following technical scheme: firstly, voltage is divided, when the voltage of a grid-connected point does not exceed a set threshold value, on one hand, the distributed photovoltaic runs in an MPPT state, and on the other hand, the power output of a movable type optical storage system is adjusted to enable the energy storage SOC of a flywheel to be in an available range; and when the grid-connected point voltage exceeds a set threshold, optimizing and controlling by taking the capacity of the movable optical storage system and the energy storage SOC as constraint conditions and taking reduction of grid-connected point voltage deviation and improvement of power factor as optimization targets.
The invention provides a grid-connected point voltage control method of a movable light storage system, as shown in fig. 1, comprising the following steps:
s1, acquiring the voltage of the grid-connected point at the current moment and the voltage of the movable light storage system access point;
s2, when the grid-connected point voltage enters a set compensation interval, determining the apparent power output value of the optical storage system at the next moment based on the voltage of the grid-connected point at the current moment and the voltage of the access point of the optical storage system;
s3, determining a control strategy for the optical storage system based on the relation between the apparent power output value and the maximum capacity of the optical storage system, and the output power of the optical storage system under the control strategy.
The invention can continuously adjust the active/reactive output according to the voltage deviation of the grid-connected point and by combining the power output capability of the system, realize the active support of the grid-connected point voltage, improve the power supply quality of the tail end of the power distribution network and improve the power factor.
Based on the contents of the above embodiments, the present embodiment is described in further detail with reference to fig. 2. Fig. 2 shows a flow of a method for controlling a grid-connected point voltage of a movable light storage system, which includes the following steps:
step 1: and drawing an access topological graph according to the network structure of the movable light storage system, as shown in fig. 3, selecting a point a and a point B of a voltage/current measurement point, wherein the point a is a grid connection point, and the point B is an access point of the movable light storage system, and the movable light storage system is also called as a movable light storage power generation system.
Step 2: collecting A point voltage/current (U)A、IA) And point B voltage/current (U)B、IB) The current is positive in the direction of the flow load, and the active/reactive power (P) of the two points is calculatedA/QA，PB/QB）。
And step 3: when the voltage of the grid-connected point UA∈[Umin1,Umax1]The power of the alternating current side is adjusted according to the battery energy storage/flywheel energy storage SOC and the photovoltaic output, and distributed new energy is preferentially used for charging each battery energy storage/flywheel energy storage unit, so that the rotating speed of the flywheel reaches the rated rotating speed; when U is turnedA∉[Umin2,Umax2]Then executing step 4; when U is turnedAWhen the device is in the hysteresis zone, the device keeps the operation state at the last moment.
In this embodiment, [ U ] will bemin1,Umax1]Set as a fluctuation interval, set [ U ] tomin2,Umax2]The interval is defined as the compensation interval, while Umax1 ≠Umin2Namely, the fluctuation interval and the compensation interval are discontinuous, the interval between the fluctuation interval and the compensation interval is defined as a hysteresis zone, when the voltage of the grid-connected point is in the hysteresis zone, the operation state at the previous moment is kept, three intervals are set, frequent switching of energy storage can be avoided, the service life of the energy storage is prolonged, the setting of the fluctuation interval in the embodiment is set according to the actual condition of a user, and the setting of the compensation interval is based on +/-10% of the nominal voltage.
And 4, step 4: calculating individual active and reactive compensation values Pcom/QcomThe calculation formula is as follows;
Figure 574222DEST_PATH_IMAGE006
（1）
Figure 452180DEST_PATH_IMAGE007
（2）
Figure 506723DEST_PATH_IMAGE008
（3）
in the formula (I), the compound is shown in the specification,P A-s (t)、Q A-s (t) Respectively carrying out the active and reactive power values at the A point when single power regulation is carried out at the current moment,U norm is a rated voltage value.
And 5: calculating the apparent power output value of the optical storage system at the next moment in two compensation modes, wherein the apparent power output value comprises the following steps: apparent active power output valueS B-P （t+1) and apparent reactive power output valueS B-Q （t+1) as shown in formula (4):
Figure 389098DEST_PATH_IMAGE001
（4）
step 6: will be provided withS B-P （t +1）、S B-Q （t+1) bringing into (5) the run modeC flagThe power compensation control method can be divided into four ways by using the output capacity of the optical storage system as a constraint condition, as shown in table 1, wherein the control strategy is markedC flag（t+1) can be calculated according to equation (5).
TABLE 1 control strategy logic Table
C flag（t+1) value Control strategy numbering Control meaning
1 1 Independently perform active/reactive compensation
2 2 Active/reactive compensation can not be carried out independently
3 3 The active compensation alone can be realized, and the reactive compensation alone can not be realized
4 4 The reactive compensation alone can be realized, and the active compensation alone can not be realized
Figure 771668DEST_PATH_IMAGE009
（5）
And 7: and calculating corresponding active/reactive output power values of the optical storage system according to the control strategies.
And a control strategy 1, which aims at optimizing the power factor of the point A, adopts active compensation, reactive compensation or simultaneously performs active compensation and reactive compensation, and when performing reactive compensation, determines the magnitude of reactive power compensation performed by the optical storage system according to the magnitude of the reactive compensation power and the magnitude of the current reactive power of the point A through a formula (6) if the direction of performing reactive compensation is different from the reactive direction of the current grid-connected point, otherwise, keeps the current reactive power output.
When active compensation is performed, the active power of the optical storage system is calculated by formula (7):
Figure 233743DEST_PATH_IMAGE010
（6）
Figure 408372DEST_PATH_IMAGE011
（7）
in the formula:P B-ref （t) As the current timetThe active output power of the optical storage system; Δ U: (t) The deviation between the grid-connected point voltage and the rated voltage at the current moment; u shapeA（t) As the current timetVoltage of (d);Q A-ref （t) After compensation for grid-connected point at current momenttReactive output power of, andQ A-ref （t）=Q A （t）+ Q B-ref （t）- Q B （t）；P A （t) As the current timetThe active power of the grid-connected point;P B （t) As the current timetActive power of the optical storage system;Q B-ref （t) For the light-storing system at the current momenttThe reactive output power of (a);Q com （t) As the current timetThe reactive compensation value of (a); q A （t) The reactive power at the point A at the current moment is obtained; q B （t) The reactive power at the point B at the present moment.
According to the calculation formula of the power factor, the power factor of the grid-connected point can be improved by adjusting the reactive power of the grid-connected point.
A control strategy 2, which takes the reduction of the deviation of the grid-connected point as an optimization target, simultaneously carries out active compensation and reactive compensation, and carries out the upper limit of the active/reactive compensation according to the light storage systemP com-max （t）、Q com-max （t) And determining the given value of active/reactive output, wherein the calculation mode is shown as the formula (8) -formula (11).
Figure 946801DEST_PATH_IMAGE012
（8）
Figure 65935DEST_PATH_IMAGE013
（9）
Figure 348012DEST_PATH_IMAGE014
（10）
Figure 501782DEST_PATH_IMAGE015
（11）
In the formula:P com-max （t) As the current timetThe upper limit of active compensation; delta U P （t+1) Only carrying out active compensation for the voltage deviation value at the next moment at the current moment; delta U Q （t) Only performing reactive compensation for the current moment and then performing voltage deviation value at the next moment;Q com-max （t) As the current timetAn upper limit of reactive compensation;
and 3, only performing active compensation under the control strategy, keeping the reactive output unchanged, and showing the active/reactive given value of the optical storage system as the formula (12).
Figure 663642DEST_PATH_IMAGE016
（12）
And 4, only performing reactive compensation under the control strategy, keeping the active output unchanged, and showing the active/reactive given value of the optical storage system as the formula (13).
Figure 817543DEST_PATH_IMAGE017
（13）
And 8: the resulting power output of the optical storage system will be optimized.
The embodiment that this embodiment provided is applicable to the control that contains the portable light of energy storage system grid-connected point voltage, when light stores up system access point voltage and takes place undulant, carries out optimal control through the energy storage charge-discharge to portable light stores up the system for the voltage of light stores up the system access point and can the steady operation in reasonable range.
According to the technical scheme of the embodiment, the power output can be adjusted in real time according to the fluctuation size of the grid-connected point voltage and the active/reactive support capability of the movable light storage system at the current moment, the grid-connected point voltage is stabilized, the voltage deviation is reduced, and meanwhile, the grid-connected point power factor can be improved. In order to explain the effect of the grid-connected point voltage control method of the movable light storage system provided by the embodiment of the invention, a grid-connected point voltage active support control strategy test is performed in an experimental environment, and the test results are as follows:
1) the movable type light storage system outputs active power P = -50kW at the initial grid-connected operation moment, reactive power Q =50kVar, the output power of the 2# photovoltaic simulator is 100kW, and the RLC load is 50kW, -45 kVart. And adjusting the active/reactive outputs of the RLC loads to be 0 at the moment t, adjusting the grid-connected voltage to exceed a set threshold value, calculating that the movable type optical storage system adopts a control strategy 1, and simultaneously performing active and reactive adjustment, wherein the active power of the movable type optical storage system is increased to-100 kW, and the reactive power is reduced to 0.
2) The active power of the movable light storage system at the initial moment is-30 kW, the reactive power is-20 kVar, the output power of the No. 2 photovoltaic simulator is 100kW, and the RLC load is 70kW and 20 kVar. And adjusting the active power of the RLC load to be 0 at the moment t, enabling the voltage to exceed a set threshold value, and adjusting the active power by adopting a control strategy 3 through calculation of the movable light storage system, wherein the active power is increased to-100 kW from-30 kW, and the reactive power is kept unchanged.
3) The active power of the movable light storage system at the initial moment is-70 kW, the reactive power is 30kVar, the output power of the No. 2 photovoltaic simulator is 70kW, and the RLC load is-30 kVar. And adjusting the reactive power of the RLC load to 70kVar at the time t, and when the voltage exceeds a set threshold value, performing reactive power adjustment by adopting a control strategy 4 through calculation of the movable light storage system, wherein the active power is kept unchanged, and the reactive power adjustment value is-67 kVar.
The control strategy provided by the embodiment can be widely applied to a mobile photovoltaic/energy storage system, is used for solving the problem of grid-connected point voltage fluctuation caused by distributed new energy access and seasonal/periodic load, and simultaneously improves the power factor of the grid-connected point.
The movable light storage system in this embodiment is a power generation system, and includes a photovoltaic system and an energy storage system, where the light storage system is placed on a movable device and is called a movable light storage system, and the energy storage system may be a battery or a flywheel for storing energy, and other types of energy storage.
Based on the same inventive concept, the invention also provides a grid-connected point voltage control system of the movable light storage system, which comprises:
the acquisition module is used for acquiring the voltage of a grid-connected point at the current moment and the voltage of a movable light storage system access point;
the determining module is used for determining the apparent power output value of the optical storage system at the next moment based on the voltage of the grid-connected point at the current moment and the voltage of the access point of the optical storage system when the grid-connected point voltage enters a set compensation interval;
and the control strategy module is used for determining a control strategy of the optical storage system based on the relation between the apparent power output value and the maximum capacity of the optical storage system and the output power of the optical storage system under the control strategy.
In an embodiment, the determining module includes:
the first determining unit is used for respectively determining a reactive compensation value when reactive compensation is adopted and an active compensation value when active compensation is adopted at the current moment based on the voltage of the grid-connected point and the voltage of the optical storage system access point at the current moment;
the second determining unit is used for determining the apparent power output value of the optical storage system at the next moment based on the reactive compensation value and the active compensation value at the current moment;
wherein the apparent power output value comprises: an apparent active power output value and an apparent reactive power output value.
In an embodiment, the apparent power output value of the optical storage system at the next time is determined according to the following formula:
Figure 231206DEST_PATH_IMAGE018
in the formula:S B-P (t +1) is the apparent active power output value of the optical storage system at the next moment;P B （t) As the current timetActive power of the optical storage system;P com （t) As the current timetActive compensation value of (1);S B-Q (t +1) is the apparent reactive power output value of the optical storage system at the next moment;Q B （t) As the current timetReactive power of the optical storage system;Q com （t) As the current timetThe reactive compensation value of (2).
In an embodiment, the control strategy of the light storage system includes:
when in useS B-P （t +1）≤ S maxAnd isS B-Q （t +1）≤ S maxIn the process, active compensation and reactive compensation aiming at optimizing the power factor of a grid-connected point are adopted or are simultaneously carried out;
when in useS B-P （t +1）>S maxAnd isS B-Q （t +1）>S maxIn time, adopting power compensation aiming at reducing voltage deviation of a grid-connected point;
when in useS B-P （t +1）< S maxAnd isS B-Q （t +1）>S maxIn time, active compensation aiming at reducing the voltage deviation of the grid-connected point is adopted;
when in useS B-P （t +1）>S maxAnd isS B-Q （t +1）< S max In time, reactive compensation aiming at reducing voltage deviation of a grid connection point is adopted;
whereinS B-P (t +1) is the apparent active power output value of the optical storage system at the next moment;S B-Q (t +1) is the apparent reactive power output value of the optical storage system at the next moment;S maxis the maximum capacity of the optical storage system in the optical storage system.
In an embodiment, the performing active compensation, reactive compensation or both active compensation and reactive compensation with a goal of optimizing a power factor of a grid-connected point includes:
when the reactive compensation is executed, if the reactive compensation direction is different from the reactive direction of the current grid-connected point, calculating the reactive output power of the optical storage system according to the reactive compensation power and the current reactive power of the grid-connected point according to a first calculation formula, otherwise, keeping the current reactive power output;
and when the active compensation is executed, calculating the active output power of the optical storage system according to the second calculation formula.
In an embodiment, the first calculation is as follows:
Figure 973903DEST_PATH_IMAGE019
in the formula:Q B-ref （t) For the light-storing system at the current momenttThe reactive output power of (a);Q com （t) As the current timetThe reactive compensation value of (a); q A （t) The reactive power at the grid-connected point at the current moment is obtained; q B （t) The reactive power of the optical storage system at the current moment.
In an embodiment, the second calculation is as follows:
Figure 119714DEST_PATH_IMAGE020
in the formula:P B-ref （t) As the current timetThe active output power of the optical storage system; Δ U: (t) As the current timetDeviation of grid-connected point voltage from rated voltage; u shapeA（t) As the current timetThe voltage of the grid-connected point;Q A-ref （t) After compensation for grid-connected point at current momenttThe reactive output power of (a);P A （t) As the current timetThe active power of the grid-connected point;P B （t) As the current timetActive power of the light storage system.
In an embodiment, the power compensation aiming at reducing the voltage deviation of the grid-connected point includes:
calculating an active power output value of the optical storage system according to a third calculation formula;
calculating a reactive power output value of the optical storage system according to a fourth calculation formula;
and compensating the voltage of the grid-connected point based on the active power output value and the reactive power output value.
In an embodiment, the third equation:
Figure 823228DEST_PATH_IMAGE021
in the formula:P B-ref （t) As the current timetThe active output power of the optical storage system;P com-max （t) As the current timetThe upper limit of active compensation; delta U P （t+1) istAfter only active power compensation is carried out at any momentt A voltage deviation value at +1 time; delta U Q （t +1) istAfter only carrying out reactive compensation at any momentt A voltage deviation value at +1 time;P A （t) As the current timetActive power of the point of connection.
In an embodiment, the fourth calculation:
Figure 696375DEST_PATH_IMAGE022
in the formula:Q B-ref （t) For the light-storing system at the current momenttThe reactive output power of (a); q A （t) The reactive power at the grid-connected point at the current moment is obtained; delta U P （t+1) istAfter only active power compensation is carried out at any momentt A voltage deviation value at +1 time; delta U Q （t +1) istAfter only carrying out reactive compensation at any momentt A voltage deviation value at +1 time;Q com-max （t) As the current timetThe upper limit of reactive compensation.
In an embodiment, the active compensation aiming at reducing the voltage deviation of the grid-connected point includes:
the light storage system outputs an active compensation value at the current moment and outputs reactive power at the current moment.
In an embodiment, the adopting reactive power compensation aiming at reducing the voltage deviation of the grid-connected point includes:
and the light storage system outputs a reactive compensation value at the current moment and outputs the active power of a grid-connected point.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The present invention is not limited to the above embodiments, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention are included in the scope of the claims of the present invention which are filed as the application.

Claims (15)

1. A grid-connected point voltage control method of a movable light storage system is characterized by comprising the following steps:
acquiring the voltage of a grid-connected point at the current moment and the voltage of a movable light storage system access point;
when the grid-connected point voltage enters a set compensation interval, determining the apparent power output value of the optical storage system at the next moment based on the voltage of the grid-connected point at the current moment and the voltage of the access point of the optical storage system;
and determining a control strategy for the optical storage system based on the relation between the apparent power output value and the maximum capacity of the optical storage system, and the output power of the optical storage system under the control strategy.
2. The method of claim 1, wherein determining an apparent power output value of the light storage system at a next moment in time based on the voltage of the point of connection at the current moment in time and the voltage of the access point of the light storage system comprises:
respectively determining a reactive compensation value when reactive compensation is adopted and an active compensation value when active compensation is adopted at the current moment based on the voltage of the grid-connected point at the current moment and the voltage of the access point of the optical storage system;
determining the apparent power output value of the optical storage system at the next moment based on the reactive compensation value and the active compensation value at the current moment;
the apparent power output values include: an apparent active power output value and an apparent reactive power output value.
3. The method of claim 2, wherein the apparent power output value of the optical storage system at the next time is determined according to the following equation:
Figure 633676DEST_PATH_IMAGE001
in the formula:S B-P (t +1) is the apparent active power output value of the optical storage system at the next moment;P B （t) As the current timetActive power of the optical storage system;P com （t) As the current timetActive compensation value of (1);S B-Q (t +1) is the apparent reactive power output value of the optical storage system at the next moment;Q B （t) As the current timetReactive power of the optical storage system;Q com （t) As the current timetThe reactive compensation value of (2).
4. The method of claim 1, wherein the control strategy of the light storage system comprises:
when in useS B-P （t +1）≤ S maxAnd isS B-Q （t +1）≤ S maxIn the process, active compensation and reactive compensation aiming at optimizing the power factor of a grid-connected point are adopted or are simultaneously carried out;
when in useS B-P （t +1）>S maxAnd isS B-Q （t +1）>S maxIn time, adopting power compensation aiming at reducing voltage deviation of a grid-connected point;
when in useS B-P （t +1）< S maxAnd isS B-Q （t +1）>S maxIn time, active compensation aiming at reducing the voltage deviation of the grid-connected point is adopted;
when in useS B-P （t +1）>S maxAnd isS B-Q （t +1）< S max In time, reactive compensation aiming at reducing voltage deviation of a grid connection point is adopted;
whereinS B-P (t +1) is the apparent active power output value of the optical storage system at the next moment;S B-Q (t +1) is the apparent reactive power output value of the optical storage system at the next moment;S maxis the maximum capacity of the optical storage system in the optical storage system.
5. The method of claim 4, wherein the employing active compensation, reactive compensation, or both active compensation and reactive compensation with the goal of optimizing power factor at a grid-tie point comprises:
when the reactive compensation is executed, if the reactive compensation direction is different from the reactive direction of the current grid-connected point, calculating the reactive output power of the optical storage system according to the reactive compensation power and the current reactive power of the grid-connected point according to a first calculation formula, otherwise, keeping the current reactive power output;
and when the active compensation is executed, calculating the active output power of the optical storage system according to the second calculation formula.
6. The method of claim 5, wherein the first calculation is as follows:
Figure 967574DEST_PATH_IMAGE002
in the formula:Q B-ref （t) For the light-storing system at the current momenttThe reactive output power of (a);Q com （t) As the current timetThe reactive compensation value of (a); q A （t) The reactive power at the grid-connected point at the current moment is obtained; q B （t) The reactive power of the optical storage system at the current moment.
7. The method of claim 5, wherein the second calculation is as follows:
Figure 729994DEST_PATH_IMAGE003
in the formula:P B-ref （t) As the current timetThe active output power of the optical storage system; Δ U: (t) As the current timetDeviation of grid-connected point voltage from rated voltage; u shapeA（t) As the current timetThe voltage of the grid-connected point;Q A-ref （t) After compensation for grid-connected point at current momenttThe reactive output power of (a);P A （t) As the current timetThe active power of the grid-connected point;P B （t) As the current timetActive power of the light storage system.
8. The method of claim 4, wherein employing power compensation targeted at reducing voltage deviations of a grid-connected point comprises:
calculating an active power output value of the optical storage system according to a third calculation formula;
calculating a reactive power output value of the optical storage system according to a fourth calculation formula;
and compensating the voltage of the grid-connected point based on the active power output value and the reactive power output value.
9. The method of claim 8, wherein the third calculation:
Figure 380418DEST_PATH_IMAGE004
in the formula:P B-ref （t) As the current timetThe active output power of the optical storage system;P com-max （t) As the current timetThe upper limit of active compensation; delta U P （t+1) istAfter only active power compensation is carried out at any momentt A voltage deviation value at +1 time; delta U Q （t +1) istAfter only carrying out reactive compensation at any momentt A voltage deviation value at +1 time;P A （t) As the current timetActive power of the point of connection.
10. The method of claim 8, wherein the fourth calculation:
Figure 491463DEST_PATH_IMAGE005
in the formula:Q B-ref （t) For the light-storing system at the current momenttThe reactive output power of (a); q A （t) The reactive power at the grid-connected point at the current moment is obtained; delta U P （t+1) istAfter only active power compensation is carried out at any momentt A voltage deviation value at +1 time; delta U Q （t +1) istAfter only carrying out reactive compensation at any momentt A voltage deviation value at +1 time;Q com-max （t) As the current timetThe upper limit of reactive compensation.
11. The method of claim 4, wherein said employing active compensation aimed at reducing voltage deviations of grid-connected points comprises:
the light storage system outputs an active compensation value at the current moment and outputs reactive power at the current moment.
12. The method of claim 4, wherein employing reactive compensation targeted at reducing voltage deviations of a grid-connected point comprises:
and the light storage system outputs a reactive compensation value at the current moment and outputs the active power of a grid-connected point.
13. The method as claimed in claim 1, wherein after obtaining the voltage of the current point-in-time and the voltage of the portable optical storage system access point, and before the point-in-time voltage enters the set compensation interval, the method further comprises:
when the voltage of the grid-connected point is in a set fluctuation interval, discharging is selected or surplus electricity is used for charging the light storage system according to the charge state of the light storage system;
when the voltage of the grid-connected point is in a hysteresis zone, the operation state of the last moment is kept;
wherein the fluctuation interval < hysteresis zone < compensation interval.
14. A grid-connected point voltage control system of a movable light storage system is characterized by comprising:
the acquisition module is used for acquiring the voltage of a grid-connected point at the current moment and the voltage of a movable light storage system access point;
the determining module is used for determining the apparent power output value of the optical storage system at the next moment based on the voltage of the grid-connected point at the current moment and the voltage of the access point of the optical storage system when the grid-connected point voltage enters a set compensation interval;
and the control strategy module is used for determining a control strategy of the optical storage system based on the relation between the apparent power output value and the maximum capacity of the optical storage system and the output power of the optical storage system under the control strategy.
15. The system of claim 14, wherein the determination module comprises:
the first determining unit is used for respectively determining a reactive compensation value when reactive compensation is adopted and an active compensation value when active compensation is adopted at the current moment based on the voltage of the grid-connected point and the voltage of the optical storage system access point at the current moment;
and the second determining unit is used for determining the apparent power output value of the optical storage system at the next moment based on the reactive compensation value and the active compensation value at the current moment.
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