CN114006403B - Light-storage combined power generation system and multi-mode self-adaptive adjustment operation control algorithm thereof - Google Patents
Light-storage combined power generation system and multi-mode self-adaptive adjustment operation control algorithm thereof Download PDFInfo
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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
- H02J3/381—Dispersed generators
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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
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
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- 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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- 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
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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
- 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
- H02J2300/26—The renewable source being solar energy of photovoltaic origin involving maximum power point tracking control for photovoltaic sources
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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- 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
- Y02E40/10—Flexible AC transmission systems [FACTS]
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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
- Y02E70/00—Other energy conversion or management systems reducing GHG emissions
- Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin
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Abstract
The invention provides an optical storage combined power generation system, which comprises a distributed photovoltaic, a battery energy storage system, a direct current converter DC/DC and a set of network side converters, wherein the distributed photovoltaic is connected with the battery energy storage system; the output of the battery energy storage system is directly connected with a direct current bus for maintaining the voltage stability of the direct current bus; the distributed photovoltaic is connected to a direct current bus through a direct current converter DC/DC; the direct current side of the grid-side converter is connected with a direct current bus, and the alternating current side is connected with a power grid; on one hand, the network-side converter collects voltage and current data at the sampling point 1 and the sampling point 2 in real time, and obtains running state information of a power grid and a power load; on the other hand, the real-time communication is kept between the DC/DC converter and the battery energy storage system, and the running state of the battery energy storage system is controlled. The invention also discloses a multi-mode self-adaptive regulation operation control algorithm of the light-storage combined power generation system. The invention can realize stable operation of the power generation system in three modes of grid connection, off-grid and off-grid switching and mutual conversion among modes.
Description
Technical Field
The invention belongs to the technical field of operation control of photovoltaic and energy storage systems, and particularly relates to a photovoltaic and energy storage combined power generation system and a multi-mode self-adaptive regulation operation control algorithm thereof.
Background
The distributed photovoltaic installation is convenient, space resources can be fully utilized to be installed on the roof, the roof of a bicycle shed, the service area of a highway and the like, and the distributed photovoltaic installation is widely applied to the Shandong places, jiangsu places and the like at present.
However, the distributed photovoltaic power generation is greatly influenced by the environment, has strong volatility, and has no neglect to influence on a power system after large-scale access. The energy storage system can realize bidirectional flow of energy and can control output power, and the energy storage system and the distributed photovoltaic are combined to effectively smooth photovoltaic fluctuation, so that the influence on a power grid is reduced; secondly, the utilization rate of the distributed photovoltaic can be improved; and thirdly, the power supply can be used as a backup power supply to supply power for the load when the power grid is abnormal. The light-storage combined power generation system (hereinafter referred to as a combined power generation system) has obvious advantages, but the control algorithm research of the combined power generation system in different modes of grid connection, off-grid and off-grid switching and how to reduce the loss in the operation process of the power generation system are not thoroughly researched at present.
Disclosure of Invention
In order to solve the technical problems, the invention provides an optical storage combined power generation system and a multi-mode self-adaptive low-loss regulation operation control algorithm thereof, which can realize stable operation and inter-mode conversion of the power generation system under three modes of grid connection, off-grid and off-grid switching; secondly, two modes of autonomous operation and manual operation can be considered, and autonomous switching between the two operation modes can be realized according to actual operation conditions; thirdly, the fluctuation of the output of the power generation system can be reduced in the grid-connected operation process, the influence on a power grid is reduced, and the utilization rate of new energy is improved; fourth, can promote the energy storage system and supply the ability to the outside in the off-grid operation; and fifthly, the self loss can be reduced in the operation process of the power generation system, and the energy utilization rate is further improved.
In order to solve the technical problems, the invention adopts the following technical scheme:
an optical storage combined power generation system comprises a distributed photovoltaic, a battery energy storage system, a direct current converter DC/DC and a set of grid-side converter;
the output of the battery energy storage system is directly connected with a direct current bus for maintaining the voltage stability of the direct current bus;
the distributed photovoltaic is connected to a direct current bus through a direct current converter DC/DC;
the direct current side of the grid-side converter is connected with a direct current bus, and the alternating current side is connected with a power grid;
on one hand, the network-side converter collects voltage and current data at the sampling point 1 and the sampling point 2 in real time, and obtains running state information of a power grid and a power load; on the other hand, the real-time communication is kept between the DC/DC converter and the battery energy storage system, and the running state of the battery energy storage system is controlled.
Sample point 1 is connected to 380VAC and sample point 2 is connected to an electrical load.
The power utilization load is connected with a power grid through a switch QS1, and a grid-connected point switch QS0 is arranged on the power grid.
A multi-mode self-adaptive regulation operation control algorithm of a light-storage combined power generation system comprises the following steps:
step 1: the network side converter reads voltage information U at sampling point 1 abc_pcc And calculates the grid-connected point frequency f according to the voltage information abc_pcc The method comprises the steps of carrying out a first treatment on the surface of the If the power grid meets the formula (1), the power grid is in a normal running state, otherwise, the power grid is abnormal; power grid operation sign PCC when power grid operation is normal flag =1, otherwise PCC flag ＝0；
U abc_pcc ∈[U low ，U up ]And f abc_pcc ∈[f 1ow ，f up ] (1)
Wherein PCC represents the power grid, U abc_pcc Representing the three-phase voltage of the network, f abc_pcc Representing the three-phase electrical frequency of the grid, PCC flag Representing the running sign of the power grid, U low Representing the lowest voltage of the power network, U up Representing the highest voltage of the power grid, f low Representing the lowest frequency of the power grid, f up Representing the highest frequency of the grid;
step 2: if the power grid is normal, judging the current running state of the optical storage combined power generation system, if the current running state is in the grid-connected running state, performing grid-connected running control subprogram by the optical storage combined power generation system, otherwise, performing synchronous running control subprogram;
step 3: if PCC flag If the power generation system is=0, the grid-connected point switch QS0 is disconnected, and the optical storage combined power generation system enters an off-grid operation control subroutine;
step 4: if PCC flag And (1) and the optical storage combined power generation system is in an off-grid operation state, and the optical storage combined power generation system enters a synchronous operation control subroutine.
The grid-connected operation control subroutine in the step 2 specifically comprises the following steps:
step 2-1: after entering a grid-connected operation control subprogram, judging the voltage U of the distributed photovoltaic port pv If U pv ＞U pv_min Reading the current running state of the DC/DC of the direct current converter, otherwise judging Flag auto Whether or not to be 1, if Flag auto =1, then the DC converter DC/DC shutdown is performed, and the DC converter DC/DC automatic shutdown flag is set to 1, i.e. PV flag Otherwise, the direct current converter DC/DC operates in MPPT mode;
wherein PV represents distributed photovoltaic, U pv_min Representing the minimum voltage of the distributed photovoltaic port, flag auto Automatic running sign representing DC/DC of DC converter and PV flag Representing a distributed photovoltaic operation sign, wherein MPPT represents a maximum power point tracking solar controller;
step 2-2: if the DC/DC of the direct current converter is in the running state, the running mode of the DC/DC is adjusted, and the DC/DC is operated according to the MPPT mode; if the DC/DC of the direct current converter is not in an operation state, the Flag is read auto Value of Flag auto Starting a direct current converter DC/DC to operate in an MPPT mode when the power supply is in an operation mode of the MPPT, otherwise, keeping the current state;
step 2-3: according to the read voltage U at the sampling point 2 abc_load Current I abc_load Data calculation of current power consumption load side power size P load (t) taking the direction of current flowing to the power grid as positive, and simultaneously reading the current distributed photovoltaic output power P pv (t)；
Step 2-4: reading the current SOC (t) state of the battery energy storage system, and calculating the upper limit value P of chargeable power of the battery energy storage system at the next moment bat_charge_max (t+1)；
P bat_charge_max (t+1)＝SOC bat_charge_flag *P bat_charge_set (2)
Wherein SOC is bat_charge_flag Charge flag for current battery SOC, P bat_charge_set For the set dischargeable power of the battery, SOC max Is the upper limit value of the battery SOC;
step 2-4: calculating the output power P of the network-side converter at the next moment according to the step (4) pcs (t+1)；
Wherein PCS stands for network side converter;
step 2-5: if the output power value of the network-side converter at the next moment is smaller than the running loss value of the network-side converter, namely P pcs (t+1)≤P loss And (4) switching to standby operation, otherwise, performing grid-connected discharging operation according to the power value calculated in the formula (4).
The off-grid operation control subroutine in step 3 specifically includes the following steps:
step 3-1: setting the output voltage U of the light-storage combined power generation system pcs_ref Frequency f pcs_ref ；
Step 3-2: reading the current power consumption load power P load (t), calculating the maximum output power P of the distributed photovoltaic at the next moment by using the battery SOC (t) pv_max (t+1)，
P pv_max (t+1)＝P bat_charge_max (t+1)+P load (t) (5)；
Step 3-3: reading the voltage of a distributed photovoltaic port, repeating the step 2-1, wherein the DC/DC of the direct current converter is in a power-limited running state, and the maximum output power is P pv_max (t+1)。
In step 3-1, the set output voltages and frequencies are respectively: u (U) pcs_ref ＝380V，f pcs_ref ＝50Hz。
The synchronous operation control subroutine of step 4 specifically includes the following steps:
step 4-1: adjusting the output voltage and frequency of the grid-side converter according to the voltage of the grid-connected point;
step 4-2: detecting the port voltage U of the grid-side converter pcs_real And Phase pcs_real Judging voltage U at PCC point abc_pcc And Phase pcc If the difference is within the set threshold range, if |U pcs-real -U pcs_pcc |＜U th And |phase pcs_real -Phase pcc |＜Phase th Closing a grid-connected point switch QS0, converting the grid-side converter into standby operation, and if not, operating according to the given value of the formula (6);
wherein the PCC point is a point of combining; u (U) th Representing a voltage deviation limit value, and taking a value according to the tolerance capacity of the PCS; phase of Phase th Representing the phase deviation limit, the value is taken according to the tolerance of PCS.
The invention has the beneficial effects that:
compared with the prior art, the invention has the beneficial effects that: the patent provides a multimode self-adaptation operation control algorithm that adjusts suitable for light stores up integration power generation system, and this algorithm has following advantage:
firstly, stable operation and automatic conversion of the optical storage combined power generation system in different grid-connected and off-grid operation modes can be realized, and the convenience and the operation reliability of the combined power generation system are improved;
secondly, the running characteristics of the distributed photovoltaic and the running efficiency of the grid-side converter are fully considered, the running mode can be automatically adjusted according to the current photovoltaic output characteristics and the running state of the battery, and the overall loss of the system is reduced;
and thirdly, the output power of the combined power generation system can be adjusted according to the load, so that the influence of the distributed photovoltaic output fluctuation on the power grid is reduced.
Drawings
FIG. 1 illustrates a light-storage cogeneration system access topology;
FIG. 2 is a flow chart of the overall operation of the combined light and power generation system;
FIG. 3 is a flow chart of grid-connected operation of the optical storage cogeneration system;
FIG. 4 is a flowchart of off-grid operation of the optical storage cogeneration system;
FIG. 5 is a flow chart of the synchronous operation of the optical storage combined power generation system.
Detailed Description
The invention relates to a light-storage combined power generation system and a multi-mode self-adaptive adjustment operation control algorithm thereof, which are further described in detail below with reference to the accompanying drawings and a specific implementation method.
The topology of the light-storage combined power generation system is shown in fig. 1, and the main equipment of the power generation system comprises a distributed photovoltaic system, a battery energy storage system, a direct current converter and a set of grid-side converters. The output of the battery energy storage system is directly connected to the direct current bus for maintaining the voltage stability of the direct current bus. The distributed photovoltaic is connected to a direct current bus through DC/DC, the direct current side of the grid-side converter is connected to the direct current bus, and the alternating current side is connected to the power grid. On one hand, the network side converter collects voltage and current data at the sampling point 1 and the sampling point 2 in real time, and obtains running state information of a power grid and a load; on the other hand, the real-time communication is kept between the DC converter and the battery energy storage system, and the running state of the DC converter is controlled.
After the combined power generation system starts to operate, firstly determining the power grid operation state at the grid connection point, and when the power grid normally operates, the system is in the grid connection operation state, otherwise, the system enters the off-grid operation state.
In the grid-connected operation state, the operation mode of the distributed photovoltaic is further determined according to the port voltage of the distributed photovoltaic, if the voltage is lower than a set threshold value, the distributed photovoltaic is controlled to stop operation to reduce the operation loss, and if the voltage is higher than the set threshold value, the distributed photovoltaic is operated according to the Maximum Power Point Tracking (MPPT) mode. And for the grid-side converter, the current running state is adjusted according to the current state of charge (SOC) of the battery energy storage system, the output power of the distributed photovoltaic and the load power, the distributed photovoltaic is fully utilized to charge the battery, the load is powered, and the economic benefit is improved.
In the off-grid operation state, the grid-side converter is operated off-grid to provide stable voltage and frequency support for loads, and the distributed photovoltaic operation and MPPT, power limiting or shutdown states are required to be adjusted according to the battery energy storage SOC, the load power and the current output power of the distributed photovoltaic.
When the grid-side converter detects that the voltage of the power grid is recovered, the grid-connected point switch QS0 of the system is regulated after the voltage and the frequency output by the grid-side converter reach the synchronous grid-connected requirement, and the grid-connected operation state is recovered.
The system realizes grid-connected and off-grid autonomous operation of the optical storage system, considers manual operation under special conditions, and can perform transition between autonomous operation and manual operation according to the set operation mark and in combination with the current working state.
According to the light-storage combined power generation system, in a grid-connected operation state, the operation mode of the system can be adjusted according to the voltage of the distributed photovoltaic ports, the system loss is reduced, meanwhile, the current operation state of the grid-side converter is adjusted according to the current state of charge (SOC) of the battery energy storage system, the output power of the distributed photovoltaic and the load power, the distributed photovoltaic is fully utilized to charge the battery, the load is supplied with power, and the economic benefit is improved. In the off-grid running state, the grid-side converter runs off-grid to provide stable voltage and frequency support for the load on one hand, and on the other hand, the distributed photovoltaic running and MPPT, power limiting or shutdown states are required to be adjusted according to the battery energy storage SOC, the load power and the current output power of the distributed photovoltaic.
As shown in fig. 2 to 5, a multimode adaptive adjustment operation control algorithm of a light-storage combined power generation system includes the following steps:
step 1: the network side converter reads voltage information U at sampling point 1 abc_pcc And calculates the grid-connected point frequency f according to the voltage information abc_pcc . If the power grid satisfies the formula 1, the power grid is in a normal running state, otherwise, the power grid is abnormal. Power grid operation mark PCC when power grid operation is normal flag =1, otherwise PCC flag ＝0；
U abc_pcc ∈[U low ，U up ]And f abc_pcc ∈[f low ，f up ] (1)
Step 2: if the power grid is normal, further judging the current running state of the light-storage combined power generation system, if the current running state is in the grid-connected running state, entering a grid-connected running control subroutine by the combined power generation system, otherwise, entering a synchronous running control subroutine;
step 2-1: after entering a grid-connected operation subprogram, the distributed photovoltaic port voltage U is further judged pv If U pv ＞U pv_min The current running state of the DC/DC is further read, otherwise, flag is judged auto Whether or not to be 1, if Flag auto The DC/DC shutdown is operated, and the DC/DC automatic shutdown flag is set to 1, i.e. PV flag Otherwise, the DC/DC operates in MPPT mode;
step 2-2: and if the DC/DC is in the running state currently, the running mode of the DC/DC is adjusted, and the DC/DC is operated in an MPPT mode. If the DC/DC is not in the running state, further reading Flag auto Value of Flag auto Starting DC/DC to operate according to the MPPT mode when the current state is not the MPPT mode;
step 2-3: according to the read voltage U at the sampling point 2 abc_load Current I abc_load Data calculation of the present load side Power size P load (t) taking the direction of current flowing to the power grid as positive, and simultaneously reading the current distributed photovoltaic output power P pv (t)；
Step 2-4: reading the current SOC (t) state of the energy storage system, and calculating the upper limit value P of chargeable power of the battery energy storage system at the next moment bat_charge_max (t+1)；
P bat_charge_max (t+1)＝SOC bat_charge_flag *P bat_charge_set (2)
Wherein SOC is bat_charge_flag Charge flag for current battery SOC, P bat_charge_set For the set dischargeable power of the battery, SOC max Is the upper limit value of the battery SOC.
Step 2-4: calculating the output power P of the network-side converter at the next moment according to the step (2) pcs (t+1)；
Step 2-5: if the output power value of the network-side converter at the next moment is smaller than the running loss value of the network-side converter, namely P pcs (t+1)≤P loss And (4) switching to standby operation, otherwise, performing grid-connected discharging operation according to the power value calculated in the formula (4).
Step 3: if PCC flag And if the power generation system is=0, the grid-connected point switch QS0 is disconnected, and the combined power generation system enters an off-grid operation control subroutine.
Step 3-1: setting the output voltage and frequency of the combined power generation system, wherein U pcs_ref ＝380V，f pcs_ref ＝50Hz；
Step 3-2: reading the current load power P load (t), calculating the distributed photovoltaic maximum output power P at the next moment by using the battery SOC (t) pv_max (t+1) as shown in the formula (5).
P pv_max (t+1)＝P bat_charge_max (t+1)+P load (t) (5)
Wherein P is bat_charge_max (t+1) calculating the reference formula (2).
Step 3-3: reading the voltage of a photovoltaic port, repeating the step 2-1, wherein the DC/DC is in a power-limited running state, and the maximum output power is P pv_max (t+1)。
Step 4: if PCC flag =1, and the combined power generation system is in an off-grid operation state, then the combined power generation system enters a synchronous operation control self-program;
step 4-1: according to the voltage of the grid-connected point, regulating the output voltage and frequency of the grid-side converter, as shown in a formula (6);
step 4-2: detecting converter port voltage U pcs_real And Phase pcs_real Judging voltage U at PCC point abc_pcc And Phase pcc If the difference is within the set threshold range, if |U pcs _ real -U pcs_pcc |＜U th And |phase pcs_real -Phase pcc |＜Phase th And closing a grid-connected point switch QS0, converting the grid-connected converter into standby operation, and otherwise, operating according to the given value of the formula (6).
The foregoing is only a preferred embodiment of the invention, it being noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the present invention, and such modifications and adaptations are intended to be comprehended within the scope of the invention.
Claims (6)
1. The multi-mode self-adaptive regulation operation control algorithm of the light-storage combined power generation system is characterized in that the light-storage combined power generation system comprises a distributed photovoltaic, a battery energy storage system, a direct current converter DC/DC and a set of network-side converters;
the output of the battery energy storage system is directly connected with a direct current bus for maintaining the voltage stability of the direct current bus;
the distributed photovoltaic is connected to a direct current bus through a direct current converter DC/DC;
the direct current side of the grid-side converter is connected with a direct current bus, and the alternating current side is connected with a power grid;
on one hand, the network-side converter collects voltage and current data at the sampling point 1 and the sampling point 2 in real time, and obtains running state information of a power grid and a power load; on the other hand, the real-time communication is kept between the DC/DC converter and the battery energy storage system, and the running state of the battery energy storage system is controlled;
the multi-mode self-adaptive adjustment operation control algorithm comprises the following steps:
step 1: the network side converter reads voltage information U at sampling point 1 abc_pcc And calculates the grid-connected point frequency f according to the voltage information abc_pcc The method comprises the steps of carrying out a first treatment on the surface of the If the power grid meets the formula (1), the power grid is in a normal running state, otherwise, the power grid is abnormal; power grid operation sign PCC when power grid operation is normal flag =1, otherwise PCC flag ＝0；
U abc_pcc ∈[U low ，U up ]And f abc_pcc ∈[f low ，f up ](1)
Wherein PCC represents the power grid, U abc_pcc Representing the three-phase voltage of the network, f abc_pcc Representing the three-phase electrical frequency of the grid, PCC flag Representing the running sign of the power grid, U low Representing the lowest voltage of the power network, U up Representing the highest voltage of the power grid, f low Representing the lowest frequency of the power grid, f up Representing the highest frequency of the grid;
step 2: if the power grid is normal, judging the current running state of the optical storage combined power generation system, if the current running state is in the grid-connected running state, performing grid-connected running control subprogram by the optical storage combined power generation system, otherwise, performing synchronous running control subprogram;
step 3: if PCC flag If the power generation system is=0, the grid-connected point switch QS0 is disconnected, and the optical storage combined power generation system enters an off-grid operation control subroutine;
step 4: if PCC flag =1, and the optical storage combined power generation system is in an off-grid operation state, the optical storage combined power generation system enters a synchronous operation control subroutine;
the grid-connected operation control subroutine in the step 2 specifically comprises the following steps:
step 2-1: after entering a grid-connected operation control subprogram, judging the voltage U of the distributed photovoltaic port pv If U pv ＞U pv_min Reading the current running state of the DC/DC of the direct current converter, otherwise judging Flag auto Whether or not to be 1, if Flag auto =1, then the DC converter DC/DC shutdown is performed, and the DC converter DC/DC automatic shutdown flag is set to 1, i.e. PV flag Otherwise, the direct current converter DC/DC operates in MPPT mode;
wherein PV represents distributed photovoltaic, U pv_min Representing the minimum voltage of the distributed photovoltaic port, flag auto Automatic running sign, PV, representing DC/DC of direct current converter flag Representing a distributed photovoltaic operation sign, wherein MPPT represents a maximum power point tracking solar controller;
step 2-2: if the DC/DC of the direct current converter is in the running state, the running mode of the DC/DC is adjusted, and the DC/DC is operated in an MPPT mode; if the DC/DC of the direct current converter is not in an operation state, the Flag is read auto Value of Flag auto Starting a direct current converter DC/DC to operate in an MPPT mode when the power supply is in an operation mode of the MPPT, otherwise, keeping the current state;
step 2-3: according to the read voltage U at the sampling point 2 abc_load Current I abc_load Data calculation of current power consumption load side power size P load (t) taking the direction of current flowing to the power grid as positive, and simultaneously reading the current distributed photovoltaic output power P pv (t)；
Step 2-4: reading the current SOC (t) state of the battery energy storage system, and calculating the upper limit value P of chargeable power of the battery energy storage system at the next moment bat_charge_max (t+1)；
P bat_charge_max (t+1)＝SOC bat_charge_flag *P bat_charge_set (2)
Wherein SOC is bat_charge_flag Charge flag for current battery SOC, P bat_charge_set For the set dischargeable power of the battery, SOC max Is the upper limit value of the battery SOC;
step 2-4: calculating the output power P of the network-side converter at the next moment according to the step (4) pcs (t+1)；
Wherein PCS stands for network side converter;
step 2-5: if the output power value of the network-side converter at the next moment is smaller than the running loss value of the network-side converter, namely P pcs (t+1)≤P loss And (4) switching to standby operation, otherwise, performing grid-connected discharging operation according to the power value calculated in the formula (4).
2. The multi-mode adaptive modulation operation control algorithm of a light-storage cogeneration system according to claim 1, wherein the off-grid operation control subroutine of step 3 specifically comprises the steps of:
step 3-1: setting the output voltage U of the light-storage combined power generation system pcs_ref Frequency f pcs_ref ；
Step 3-2: reading the current power consumption load power P load (t), calculating the distributed photovoltaic maximum output power P at the next moment by using the battery SOC (t) pv_max (t+1)，
P pv_max (t+1)＝P bat_charge_max (t+1)+P load (t) (5)；
Step 3-3: reading the voltage of a distributed photovoltaic port, repeating the step 2-1, wherein the DC/DC of the direct current converter is in a power-limited running state, and the maximum output power is P pv_max (t+1)。
3. The multi-mode adaptive regulation operation control algorithm of the light-storage combined power generation system according to claim 2, wherein in step 3-1, the set output voltages and frequencies are respectively: u (U) pcs_ref ＝380V，f pcs_ref ＝50Hz。
4. The multi-mode adaptive modulation operation control algorithm for a combined light and power generation system according to claim 2, wherein the synchronous operation control subroutine of step 4 specifically comprises the steps of:
step 4-1: adjusting the output voltage and frequency of the grid-side converter according to the voltage of the grid-connected point;
step 4-2: detecting the port voltage U of the grid-side converter pcs_real And Phase pcs_real Judging voltage U at PCC point abc_pcc And Phase pcc If the difference is within the set threshold range, if |U pcs_real -U pcs_pcc |<U th And |phase pcs_real -Phase pcc |<Phase th Closing a grid-connected point switch QS0, converting the grid-side converter into standby operation, and otherwise, operating according to the given value of the formula (6);
wherein the PCC point is a point of combining; u (U) th Representing a voltage deviation limit value, and taking a value according to the tolerance capacity of the PCS; phase of Phase th Representing the phase deviation limit, the value is taken according to the tolerance of PCS.
5. The multi-mode adaptive modulation and operation control algorithm for a combined light and power generation system according to claim 1, wherein the sampling point 1 is connected with 380VAC, and the sampling point 2 is connected with an electric load.
6. The multi-mode self-adaptive regulation operation control algorithm of the light-storage combined power generation system according to claim 1, wherein the power load is connected with a power grid through a switch QS1, and a grid-connected point switch QS0 is arranged on the power grid.
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