CN112152265A - Photovoltaic active power distribution network scheduling control method based on f-dp/dv - Google Patents

Photovoltaic active power distribution network scheduling control method based on f-dp/dv Download PDF

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CN112152265A
CN112152265A CN202010980012.0A CN202010980012A CN112152265A CN 112152265 A CN112152265 A CN 112152265A CN 202010980012 A CN202010980012 A CN 202010980012A CN 112152265 A CN112152265 A CN 112152265A
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photovoltaic
frequency
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power
power supply
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CN112152265B (en
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项基
倪佳华
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Zhejiang University ZJU
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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
    • H02J3/466—Scheduling the operation of the generators, e.g. connecting or disconnecting generators to meet a given demand
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
    • G06Q10/00—Administration; Management
    • G06Q10/06—Resources, workflows, human or project management; Enterprise or organisation planning; Enterprise or organisation modelling
    • G06Q10/063—Operations research, analysis or management
    • G06Q10/0631—Resource planning, allocation, distributing or scheduling for enterprises or organisations
    • G06Q10/06312—Adjustment or analysis of established resource schedule, e.g. resource or task levelling, or dynamic rescheduling
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
    • G06Q50/00—Systems or methods specially adapted for specific business sectors, e.g. utilities or tourism
    • G06Q50/06—Electricity, gas or water supply
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
    • H02J3/241—The oscillation concerning frequency
    • 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
    • H02J3/388—Islanding, i.e. disconnection of local power supply from the network
    • 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
    • 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]
    • 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
    • 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 active power distribution network scheduling control method based on f-dp/dv, which comprises the following steps: (1) active collection of actual active power P at power distribution network portpcc(ii) a (2) Calculating reference active power and actual active power P of portpccThe power difference value delta P (3) of each photovoltaic power supply is subjected to frequency recovery control, the frequency f of the output port of each photovoltaic power supply is collected, and the corrected rated frequency is calculated
Figure DDA0002687199200000011
(4) Proportional scheduling control is carried out on each photovoltaic power supply according to the power difference value delta P from the scheduling center and a preset rated value
Figure DDA0002687199200000012
Collecting the current and voltage output by the photovoltaic system, and calculating to obtain a corrected rated value
Figure DDA0002687199200000013
(5) Each photovoltaic power supply is subjected to droop control and input
Figure DDA0002687199200000014
And
Figure DDA0002687199200000015
calculating to obtain a reference value by a droop formula
Figure DDA0002687199200000016
(6) And each photovoltaic power supply controls actual output according to the dp/dv reference value. By using the method and the device, the robustness of the alternating-current microgrid system can be improved, and the reliable control of grid connection-isolated island operation and switching of the alternating-current microgrid system is realized.

Description

Photovoltaic active power distribution network scheduling control method based on f-dp/dv
Technical Field
The invention belongs to the technical field of photovoltaic networking, and particularly relates to a photovoltaic active power distribution network scheduling control method based on f-dp/dv.
Background
With the reduction of the cost of photovoltaic power generation, the amount of photovoltaic installations is increasing day by day. The photovoltaic power generation has the characteristics of cleanness, low noise, easy management and the like, so that the photovoltaic power generation becomes an ideal substitute for fuel power generation. However, the intermittency and randomness of photovoltaic power generation pose a huge challenge to the stable operation of the power grid along with the increase of the photovoltaic permeability.
In the prior art, an energy storage system is generally configured, and the power balance is adjusted by utilizing the energy bidirectional flow characteristic of energy storage so as to alleviate the frequency fluctuation. However, as the photovoltaic permeability increases in the same microgrid, a larger capacity of stored energy needs to be configured to balance the power, which undoubtedly increases the investment. Moreover, even if sufficient energy storage is provided, there is still the possibility of overcharging and overdischarging due to the limitation of the energy storage capacity.
The Chinese patent document with the publication number of CN104065099A discloses an AC/DC hybrid modular microgrid networking structure and method based on hybrid energy storage, which realizes the modular encapsulation of multi-type loads and multi-type distributed power supplies in an AC/DC hybrid microgrid, and the modular microgrid is used as an independently controllable power supply/load unit to actively participate in the dispatching operation of a large power grid; through reasonable design of a hybrid energy storage system structure and an access mode, grid-connected/island dual-mode seamless switching becomes the natural attribute of a modularized micro-grid, but the internal control mode and composition are not specifically analyzed.
The invention discloses an alternating current-direct current hybrid multi-stage microgrid system in Chinese patent publication No. CN103280844A, which is flexible in structure and modular in structure, can form a plurality of system structures and research on grid-on and off switching of systems at all stages, but solves the problem of distributed power generation access and cannot exert the adjusting capability of controllable resources in the microgrid.
Therefore, it becomes more important to provide a new photovoltaic control strategy, so that the photovoltaic power supply has more initiative and can participate in power balance and frequency regulation to reduce the regulation pressure on the power grid or the energy storage system.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a photovoltaic active power distribution network scheduling control method based on f-dp/dv, so that a photovoltaic power supply can keep certain hot standby power under different environmental conditions to participate in mitigating frequency fluctuation, equal-proportion scheduling control of the photovoltaic power supply in a microgrid system is realized, the robustness of an alternating current microgrid system is improved, and reliable control of grid connection-isolated island operation and switching of the alternating current microgrid system is realized.
A photovoltaic active power distribution network scheduling control method based on f-dp/dv, wherein a photovoltaic power generation system adopts two-stage conversion control, the first stage is a DC/DC buck converter, the second stage is a DC/AC inverter, frequency recovery control, proportional scheduling control and droop control are added to the DC/DC buck converter, and the specific control steps are as follows:
(1) active collection of actual active power P at power distribution network portpcc；
(2) Calculating reference active power and actual active power P of portpccAnd the power difference Δ P of, and workThe rate difference value delta P is transmitted to each photovoltaic power supply;
(3) each photovoltaic power supply carries out frequency recovery control, the frequency f of the output port of each photovoltaic power supply is collected, and the corrected rated frequency is calculated
Figure BDA0002687199180000021
The control formula is as follows:
Figure BDA0002687199180000022
in the formula (f)rIs the rated frequency, KP-T,KI-TProportional and integral coefficients, respectively, for frequency recovery control, where Δ f is the frequency deviation Δ f-fr；
(4) Proportional scheduling control is carried out on each photovoltaic power supply according to the power difference value delta P from the scheduling center and a preset rated value
Figure BDA0002687199180000031
Collecting the current and voltage output by the photovoltaic system, and calculating to obtain a corrected rated value
Figure BDA0002687199180000032
The control formula is as follows:
Figure BDA0002687199180000033
wherein the content of the first and second substances,
Figure BDA0002687199180000034
is a modified nominal dp/dv, KP-S，KI-SRespectively proportional and integral coefficients of proportional scheduling control, where Δ P is the power difference of the tie line, and Δ P is Pr-Ppcc，PrIs rated power;
(5) each photovoltaic power supply is subjected to droop control and input
Figure BDA0002687199180000035
And
Figure BDA0002687199180000036
calculating to obtain a reference value by a droop formula
Figure BDA0002687199180000037
The control formula is as follows:
Figure BDA0002687199180000038
wherein the content of the first and second substances,
Figure BDA0002687199180000039
is a photovoltaic power output dp/dv reference value,
Figure BDA00026871991800000310
is the corrected rated dp/dv, n is the droop coefficient, f is the photovoltaic power output port frequency,
Figure BDA00026871991800000311
is the corrected nominal frequency;
(6) and each photovoltaic power supply controls actual output according to the dp/dv reference value.
The method disclosed by the invention is based on f-dp/dv control, so that a photovoltaic power supply can keep certain hot standby power to participate in mitigating frequency fluctuation under different environmental conditions in the alternating-current microgrid, the equal-proportion schedulable control of the photovoltaic power supply is realized, and the robustness of an alternating-current microgrid system is improved.
In order to decouple the control between the layers, in the step (3), a first-order inertia module is added in the frequency recovery control, and the overall control formula is as follows:
Figure BDA00026871991800000312
in the formula, T3Is the inertial time constant, is the sign of the convolution,
Figure BDA00026871991800000313
is an inertial module.
In order to decouple the control between the layers, in the step (4), a first-order inertia module is added in the proportional scheduling control, and the overall control formula is as follows:
Figure BDA0002687199180000041
in the formula, T2Is the inertial time constant, is the sign of the convolution,
Figure BDA0002687199180000042
is an inertial module.
In the step (3), proportional-integral non-difference control is adopted to carry out frequency recovery, so that the frequency output of each distributed power supply can be recovered to a rated value frWhen the actual frequency is less than the nominal frequency, i.e. f<frThen Δ f>0，
Figure BDA0002687199180000043
Increase, correspondingly
Figure BDA0002687199180000044
Also increasing, the photovoltaic outputs more energy to raise the frequency; conversely, when the actual frequency is greater than the nominal frequency, i.e. f>frThen Δ f<0，
Figure BDA0002687199180000045
Decrease, respectively
Figure BDA0002687199180000046
Also reduced, the photovoltaic output is less energy to reduce the frequency.
In the step (4), when the proportional scheduling control is carried out, the actual active power P ispccInput less than nominal value PrThen Δ P>0, under the action of an integral element
Figure BDA0002687199180000047
Has been increased, i.e.
Figure BDA0002687199180000048
Increasing, the output power increases until Ppcc＝Pr. On the contrary, when the actual active power PpccInput greater than nominal value PrIf delta P is less than 0, under the action of an integral link
Figure BDA0002687199180000049
Is always reduced, i.e.
Figure BDA00026871991800000410
Decreasing, the output power decreases until Ppcc＝Pr。
In the step (6), when the droop control is carried out and the load is increased, the frequency of the output port of the photovoltaic power supply is reduced, so that the frequency of the output port of the photovoltaic power supply is reduced
Figure BDA00026871991800000411
Is reduced in that
Figure BDA00026871991800000412
Increasing, and controlling the output power of each photovoltaic power supply to increase; conversely, when the load is reduced, the frequency of the output port of the photovoltaic power supply is increased, so that
Figure BDA00026871991800000413
Is increased by
Figure BDA00026871991800000414
And the control output power of each photovoltaic power supply is reduced.
When the power distribution network is switched from the grid-connected operation mode to the isolated network operation mode, the active power delta P of the tie line is set to be zero, the tie line is disconnected, and then the isolated network operation mode is switched.
When the power distribution network is switched from the isolated network operation mode to the grid-connected operation mode, the voltage and the frequency of the power distribution network are controlled to be respectively consistent with the voltage and the frequency of the power distribution network, the phase of the voltage of the power distribution network is detected, a connecting line is connected, and then the power distribution network is switched to the grid-connected operation mode.
Compared with the prior art, the invention has the following beneficial effects:
1. according to the photovoltaic power supply control method, the photovoltaic maximum available power is obtained without an additional sensor and complex calculation, the photovoltaic power supply can always keep certain reserve power, the reserve power is used for scheduling, and output is output to alleviate frequency fluctuation.
2. The invention unifies power reserve control and frequency regulation control without complex control mode switching.
3. The invention can adjust the photovoltaic output power reserve ratio according to the demand of the distribution network side and can set control parameters to meet different control precision requirements.
Drawings
FIG. 1 is a control block diagram of photovoltaic power generation in an embodiment of the present invention;
FIG. 2 is a characteristic curve of a KC200GT photovoltaic panel under different conditions in an example of the invention;
FIG. 3 is a schematic flow chart of a photovoltaic active power distribution network scheduling control method based on f-dp/dv according to the present invention;
Detailed Description
The invention will be described in further detail below with reference to the drawings and examples, which are intended to facilitate the understanding of the invention without limiting it in any way.
As shown in fig. 1, the structure diagram of the two-stage converter control of photovoltaic power generation is shown, the first stage is a DC/DC buck converter, which is also the place where the present invention acts, and essentially controls the photovoltaic output voltage to control the output power; the second stage is a DC/AC inverter, and aims to control the stability of capacitor voltage at the connection and realize the transmission of photovoltaic energy to a power grid. The reason for the two-stage control is that the photovoltaic output is unstable, contains higher harmonic noise, CdcCan be used as an energy buffer to enable the inverter to stably operate.
The invention is mainly applied to a DC/DC buck converter and is divided into three layers according to different time scales: frequency recovery control, proportional scheduling control and droop control. Photovoltaic generator adopts a structure based on
Figure BDA0002687199180000061
Pseudo-hierarchical control of sag, the control structure being divided into three layers, the first layer
Figure BDA0002687199180000062
Controlling to realize power passive dispersion; of the second layer
Figure BDA0002687199180000063
Scheduling adjustment is carried out, and equal-proportion scheduling among the photovoltaic generators is achieved; and the frequency recovery control of the third layer is used for realizing the recovery of the frequency deviation. Generated according to an algorithm
Figure BDA0002687199180000064
And generating a PWM signal through negative feedback control to control the output of the converter.
The DC/AC inverter is used for inputting energy generated by a photovoltaic power supply into a power grid, and in order to keep frequency synchronization with the power grid, a phase-locked loop is needed for acquiring the frequency of an output port as a phase reference signal and acquiring CdcAnd the difference between the voltage and the rated value is used for generating a current reference value to the control inner ring through the proportional-integral controller, and finally, the energy transmission from the direct current side to the alternating current side is realized. However, the control of the inverter is not the focus of the present invention.
Each layer control strategy is as follows
(1) The first layer f-dp/dv droop control, its control formula is
Figure BDA0002687199180000065
Wherein the content of the first and second substances,
Figure BDA0002687199180000066
is a photovoltaic power output dp/dv reference value,
Figure BDA0002687199180000067
is the corrected rated dp/dv, n is the droop coefficient, f is the photovoltaic power output port frequency,
Figure BDA0002687199180000068
is the corrected nominal frequency.
As shown in fig. 2, it can be known from (a) of fig. 2 that the maximum power point of the photovoltaic panel changes when the external environmental conditions change, so that a tracking algorithm is required to track the maximum power point in order to achieve the maximum power point output, and if the maximum power is not desired to be output, the maximum power needs to be calculated, and the output value is adjusted according to the current output capacity. As shown in fig. 2 (b), the curves under different conditions have a certain rule: when dp/dv is 0, outputting the maximum power; when dp/dv <0, withdraw a certain power. Therefore, the control based on the dp/dv value does not need a sensor to collect temperature and irradiance, does not need complex calculation and switching of a control strategy, and is an efficient photovoltaic control strategy.
As shown above, the photovoltaic power output dp/dv value indicates how much energy is output, and the deviation of the frequency indicates the balance relationship between the energy supply and demand (supply is greater than demand, the frequency is increased, supply is less than demand, the frequency is decreased), and in order to achieve the balance between the photovoltaic energy output and the frequency stability of the alternating-current microgrid, droop control of f-dp/dv is adopted. When in use
Figure BDA0002687199180000071
When the supply is greater than the demand, then
Figure BDA0002687199180000072
The output power of the photovoltaic power supply is reduced; when in use
Figure BDA0002687199180000073
When the supply is less than the demand, then
Figure BDA0002687199180000074
The power is decreased and the output power of the photovoltaic power supply is increased.
(2) The second layer proportional scheduling control has the following control formula
Figure BDA0002687199180000075
Wherein the content of the first and second substances,
Figure BDA0002687199180000076
to a rated value, KP-S，KI-SRespectively, the proportional and integral coefficients of the second layer, where Δ P is the power difference Δ P of the tie line Pr-P。
When the actual power input at PCC is less than the nominal value, i.e., Pr>P, then Δ P>0, under the action of an integral element
Figure BDA0002687199180000077
Until P is increasedrP. And vice versa.
(3) The third layer of frequency recovery control has the following control formula
Figure BDA0002687199180000078
Wherein f isrIs the rated frequency, KP-T,KI-TProportional and integral coefficients of the third layer, respectively, and Δ f is the frequency deviation Δ f ═ fr-f。
Since frequency deviation inevitably occurs due to the drooping characteristic of f-dp/dv and the non-linear characteristic between f and dp/dv, and the frequency fluctuates when load switching, photovoltaic output fluctuation, power failure, and the like occur, frequency recovery is required here.
As shown in fig. 3, the specific control process of the present invention is as follows:
step 1, actively collecting actual active power P at a port of a power distribution networkpcc。
Step 2, calculating the reference active power and the actual active power P of the portpccAnd transmitting the power difference deltap to each photovoltaic power supply.
And 3, carrying out frequency recovery control on each photovoltaic power supply, collecting the frequency f of the output port of each photovoltaic power supply, and calculating the corrected rated frequency.
Step 4, carrying out proportional scheduling control on each photovoltaic power supply according to the power difference value delta P from the scheduling center and a preset rated value
Figure BDA0002687199180000081
Collecting the current and voltage output by the photovoltaic system, and calculating to obtain a corrected rated value
Figure BDA0002687199180000082
Step 5, each photovoltaic power supply carries out droop control and inputs the obtained droop control
Figure BDA0002687199180000083
And
Figure BDA0002687199180000084
calculating to obtain a reference value by a droop formula
Figure BDA0002687199180000085
And 6, controlling actual output of each photovoltaic power supply according to the dp/dv reference value.
In order to realize decoupling between the control of each layer, a first-order inertia module is added in the second layer and the third layer. The overall control formula is as follows:
Figure BDA0002687199180000086
when the micro-grid system is switched from a grid-connected operation mode to an isolated network operation mode, the active power delta P of the tie line is set to be zero, the tie line is disconnected, and then the isolated network operation mode is switched.
When the microgrid system is switched from an isolated network operation mode to a grid-connected operation mode, the voltage and the frequency of the microgrid system are controlled to be respectively consistent with the voltage and the frequency of a power grid, the phase of the voltage of the power grid is detected, a connecting line is connected, and then the microgrid system is switched to the grid-connected operation mode.
The embodiments described above are intended to illustrate the technical solutions and advantages of the present invention, and it should be understood that the above-mentioned embodiments are only specific embodiments of the present invention, and are not intended to limit the present invention, and any modifications, additions and equivalents made within the scope of the principles of the present invention should be included in the scope of the present invention.

Claims (8)

1. A photovoltaic active power distribution network scheduling control method based on f-dp/dv is characterized in that frequency recovery control, proportional scheduling control and droop control are added to a DC/DC buck converter, and the specific control steps are as follows:
(1) active collection of actual active power P at power distribution network portpcc；
(2) Calculating reference active power and actual active power P of portpccAnd transmitting the power difference value delta P to each photovoltaic power supply;
(3) each photovoltaic power supply carries out frequency recovery control, the frequency f of the output port of each photovoltaic power supply is collected, and the corrected rated frequency is calculated
Figure FDA0002687199170000011
The control formula is as follows:
Figure FDA0002687199170000012
in the formula (f)rIs the rated frequency, KP-T，KI-TProportional and integral coefficients for frequency recovery control, respectively, where Δ f is the frequency deviation Δ f ═ fr-f；
(4) Proportional scheduling control is carried out on each photovoltaic power supply according to the power difference value delta P from the scheduling center and a preset rated value
Figure FDA0002687199170000013
Collecting the current and voltage output by the photovoltaic system, and calculating to obtain a corrected rated value
Figure FDA0002687199170000014
The control formula is as follows:
Figure FDA0002687199170000015
wherein the content of the first and second substances,
Figure FDA0002687199170000016
is a modified nominal dp/dv, KP-S，KI-SRespectively proportional and integral coefficients of proportional scheduling control, where Δ P is the power difference of the tie line, and Δ P is Pr-Ppcc，PrIs rated power;
(5) each photovoltaic power supply is subjected to droop control and input
Figure FDA0002687199170000017
And
Figure FDA0002687199170000018
calculating to obtain a reference value by a droop formula
Figure FDA0002687199170000021
The control formula is as follows:
Figure FDA0002687199170000022
wherein the content of the first and second substances,
Figure FDA0002687199170000023
is a photovoltaic power output dp/dv reference value,
Figure FDA0002687199170000024
is the corrected rated dp/dv, n is the droop coefficient, f is the photovoltaic power output port frequency,
Figure FDA0002687199170000025
is the corrected nominal frequency;
(6) and each photovoltaic power supply controls actual output according to the dp/dv reference value.
2. The method for scheduling and controlling the photovoltaic active power distribution network based on f-dp/dv according to claim 1, wherein in the step (3), a first-order inertia module is added in the frequency recovery control, and the overall control formula is as follows:
Figure FDA0002687199170000026
in the formula, T3Is the inertial time constant, is the sign of the convolution,
Figure FDA0002687199170000027
is an inertial module.
3. The scheduling control method for the f-dp/dv-based photovoltaic active power distribution network according to claim 1, wherein in the step (4), a first-order inertia module is added in the proportional scheduling control, and the overall control formula is as follows:
Figure FDA0002687199170000028
in the formula, T2Is the inertial time constant, is the sign of the convolution,
Figure FDA0002687199170000029
is an inertial module.
4. The method for scheduling and controlling the photovoltaic active power distribution network based on f-dp/dv according to claim 1, wherein in the step (3), the proportional-integral homodyne control is adopted for frequency recovery, so that the frequency output of each distributed power supply is recovered to the rated value frWhen the actual frequency is less than the rated frequency, i.e. f < frIf Δ f is greater than 0, then,
Figure FDA00026871991700000210
increase, correspondingly
Figure FDA00026871991700000211
Also increasing, the photovoltaic outputs more energy to raise the frequency; on the contrary, when the actual frequency is larger than the rated frequency, i.e. f > frIf the value is more than 0, then the value of Delta f is less than 0,
Figure FDA00026871991700000212
decrease, respectively
Figure FDA00026871991700000213
Also reduced, the photovoltaic output is less energy to reduce the frequency.
5. The f-dp/dv-based photovoltaic active power distribution network scheduling control method according to claim 1, wherein in the step (4), when the proportional scheduling control is performed, when the actual active power P ispccInput less than nominal value PrIf delta P is greater than 0, under the action of an integral link
Figure FDA0002687199170000031
Has been increased, i.e.
Figure FDA0002687199170000032
Increasing, the output power increases until Ppcc＝Pr(ii) a On the contrary, when the actual active power PpccInput greater than nominal value PrIf delta P is less than 0, under the action of an integral link
Figure FDA0002687199170000033
Is always reduced, i.e.
Figure FDA0002687199170000034
Decreasing, the output power decreases until Ppcc＝Pr。
6. The method for scheduling and controlling the photovoltaic active power distribution network based on f-dp/dv according to claim 1, wherein in the step (5), when the droop control is performed, when the load is increased, the frequency of the output port of the photovoltaic power supply is reduced, so that the frequency of the output port of the photovoltaic power supply is reduced, and the output port of the photovoltaic power supply is controlled to be lower
Figure FDA0002687199170000035
Is reduced in that
Figure FDA0002687199170000036
Increasing, and controlling the output power of each photovoltaic power supply to increase; conversely, when the load is reduced, the frequency of the output port of the photovoltaic power supply is increased, so that
Figure FDA0002687199170000037
Is increased by
Figure FDA0002687199170000038
And the control output power of each photovoltaic power supply is reduced.
7. The f-dp/dv-based photovoltaic active power distribution network scheduling control method according to claim 1, characterized in that when the distribution network switches from a grid-connected operation mode to an isolated network operation mode, the active power Δ P of the tie line is set to zero, the tie line is disconnected, and then the distribution network switches to the isolated network operation mode.
8. The f-dp/dv-based photovoltaic active power distribution network scheduling control method according to claim 1, characterized in that when the power distribution network is switched from the isolated network operation mode to the grid-connected operation mode, the voltage and frequency of the power distribution network are controlled to be respectively consistent with the voltage and frequency of the power grid, the phase of the voltage of the power grid is detected, the tie line is connected, and then the power distribution network is switched to the grid-connected operation mode.
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