CN112467804A - Two-stage cooperative control method and system for light storage diesel micro-grid group - Google Patents

Two-stage cooperative control method and system for light storage diesel micro-grid group Download PDF

Info

Publication number
CN112467804A
CN112467804A CN202011410260.8A CN202011410260A CN112467804A CN 112467804 A CN112467804 A CN 112467804A CN 202011410260 A CN202011410260 A CN 202011410260A CN 112467804 A CN112467804 A CN 112467804A
Authority
CN
China
Prior art keywords
diesel
micro
grid
microgrid
light
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN202011410260.8A
Other languages
Chinese (zh)
Other versions
CN112467804B (en
Inventor
罗战
孙德亮
邹绍琨
杨宗军
张鹏
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hefei Sungrow New Energy Technology Co Ltd
Original Assignee
Hefei Sungrow New Energy Technology Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hefei Sungrow New Energy Technology Co Ltd filed Critical Hefei Sungrow New Energy Technology Co Ltd
Priority to CN202011410260.8A priority Critical patent/CN112467804B/en
Publication of CN112467804A publication Critical patent/CN112467804A/en
Application granted granted Critical
Publication of CN112467804B publication Critical patent/CN112467804B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • 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
    • 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
    • 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
    • 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
    • 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

Abstract

The invention provides a two-stage cooperative control method and a two-stage cooperative control system for an optical storage diesel micro-grid group. Set up the crowd's controller of microgrid crowd and realize that light stores up crowd's level control between the firewood microgrid storing up in light, act on every light through the generation and store up the disturbance of firewood microgrid, make each light store up the firewood microgrid on the basis of network level control, carry out secondary cooperative control to photovoltaic unit, firewood unit and the energy storage system in the firewood microgrid storing up in the light, adjust its external output, make light store up the more reasonable effectual cooperative operation of firewood microgrid ability, improve the overall stability of system.

Description

Two-stage cooperative control method and system for light storage diesel micro-grid group
Technical Field
The invention relates to the technical field of photovoltaic power generation, in particular to a two-stage cooperative control method and a two-stage cooperative control system for an optical storage diesel micro-grid group.
Background
With the continuous development of new energy power generation technology and microgrid technology, microgrids in a certain area are interconnected in a medium-low voltage mode for the sake of economy, stability and the like, and a common benefit is achieved for the microgrid itself and each unit in the whole area. As shown in fig. 1, a plurality of sss are interconnected and energy-efficient, forming a piconet cluster. The microgrid group is used as a new form formed by interconnection of the microgrids and needs to meet the following operating conditions: firstly, sub-piconets in a piconet group need to be physically interconnected through a connecting line, and mutual economic behaviors on energy exist; in addition, the microgrid group as a whole needs to have a uniform operation target.
When the micro-grid group is in grid-connected operation, the main grid can provide enough voltage support and power regulation, and the control method is simpler; when the system works in an off-grid mode, namely an island state, the system lacks strong support similar to a main grid, and the control difficulty of the system is higher.
Disclosure of Invention
In view of this, the invention provides a two-stage cooperative control method and system for an optical storage diesel microgrid group, which realize network-level control inside the optical storage diesel microgrid and group-level control among the optical storage diesel microgrid.
In order to achieve the above purpose, the invention provides the following specific technical scheme:
the utility model provides a two-stage cooperative control method of light storage firewood microgrid crowd, is applied to two-stage cooperative control system of light storage firewood microgrid crowd, two-stage cooperative control system of light storage firewood microgrid crowd includes microgrid crowd controller and at least two light storage firewood microgrids under the off-line state, each light storage firewood microgrid passes through the tie line and links to each other, every light storage firewood microgrid includes photovoltaic power generation unit, energy storage system, diesel generator and local controller, the method includes:
the local controller controls the local bus voltage by preferentially controlling the diesel generator in the optical storage diesel micro-grid;
under the condition that satisfies preset crowd level control condition, microgrid crowd's controller basis the power reference value and every of junctor the light stores up the firewood microgrid the rated capacity of diesel generator generates every the power regulation instruction of light storage firewood microgrid is every the output power of light storage firewood microgrid controls.
Optionally, the local controller controls the local bus voltage by preferentially controlling the diesel generator in the optical storage diesel micro-grid, including:
the local controller controls the photovoltaic power generation unit to work in an MPPT mode, and controls the diesel generator to work in a droop mode;
the local controller judges whether the local bus voltage deviation value of the light storage diesel micro-grid exceeds a preset value;
if the power consumption exceeds a preset value, the local controller controls the energy storage system to participate in power regulation;
and if the preset value is not exceeded, the local controller controls the energy storage system to work in a P-Q mode.
Optionally, the local controller controls the energy storage device to participate in power regulation, including:
the local controller acquires a frequency change difference value of the optical storage diesel micro-grid;
the local control determines a power change difference value corresponding to the frequency change difference value according to a threshold value curve of the energy storage equipment, wherein the slope of the threshold value curve is the sum of reciprocals of droop coefficients of each diesel generator in the optical storage diesel-electric micro grid;
and the local controller controls the energy storage equipment to charge or discharge according to the power change difference.
Optionally, the microgrid group controller generates each power adjustment instruction of the optical storage diesel microgrid according to the power reference value of the tie line and each rated capacity of the diesel generator of the optical storage diesel microgrid, and the instruction includes:
the microgrid group controller determines a disturbance value according to the power of the tie line and the power reference value of the tie line;
the micro-grid group controller determines a power disturbance value distributed to each light-storage diesel micro-grid according to the proportion of the rated capacity of the diesel generator of each light-storage diesel micro-grid to the total rated capacity of the diesel generators of the light-storage diesel micro-grid group and the disturbance value;
and the micro-grid group controller generates a power adjusting instruction of each light storage diesel micro-grid according to the power disturbance value distributed to each light storage diesel micro-grid.
Optionally, the microgrid group controller generates every the power adjustment instruction of light storage firewood microgrid is every the output power of light storage firewood microgrid controls, include:
the micro-grid group controller applies disturbance to each optical storage diesel micro-grid by sending a power adjusting instruction to each optical storage diesel micro-grid;
the local controller controls the diesel generator of the light storage diesel micro-grid to work in a downward hanging mode;
the local controller determines the dynamic adjustment quantity of the energy storage threshold of the energy storage system according to the droop coefficient and the disturbance value of the total droop curve of the diesel generator and the proportion of the rated capacity of the diesel generator to the total rated capacity of the diesel generator of the light storage diesel micro-grid group;
the local controller adjusts the threshold range of the energy storage system according to the dynamic adjustment amount;
and the local controller controls the energy storage system to participate in power regulation according to the adjusted threshold range under the condition that the local bus voltage deviation value of the optical storage diesel micro-grid is detected to exceed a preset value.
The utility model provides a two-stage cooperative control system of firewood microgrid crowd is stored up to light, includes: the system comprises a microgrid group controller, a communication system and at least two light storage diesel microgrids in an off-network state;
the micro-grid group controller is in communication connection with each light-storage diesel micro-grid through the communication system;
the light storage diesel micro-grid is connected with each other through a connecting line;
each light-storage diesel micro-grid comprises a photovoltaic power generation unit, an energy storage system, a diesel generator and a local controller;
the local controller is used for controlling the local bus voltage by preferentially controlling the diesel generator in the optical storage diesel micro-grid;
under the condition of receiving higher level's scheduling instruction, microgrid group controller for satisfying the condition of predetermineeing the crowd level control condition, according to the power reference value of tie-line and every the firewood microgrid is stored to light the rated capacity of diesel generator, generate every the power regulation instruction of firewood microgrid is stored to light, every the output of firewood microgrid is stored to light is controlled.
Optionally, the local controller is specifically configured to:
controlling the photovoltaic power generation unit to work in an MPPT mode, and controlling the diesel generator to work in a droop mode;
judging whether the local bus voltage deviation value of the optical storage diesel micro-grid exceeds a preset value;
if the power consumption exceeds a preset value, the local controller controls the energy storage system to participate in power regulation;
and if the preset value is not exceeded, the local controller controls the energy storage system to work in a P-Q mode.
Optionally, the local controller is specifically configured to: acquiring a frequency change difference value of the optical storage diesel micro-grid;
determining a power change difference value corresponding to the frequency change difference value according to a threshold value curve of the energy storage device, wherein the slope of the threshold value curve is the sum of reciprocals of droop coefficients of each diesel generator in the optical storage diesel-electric micro grid;
and controlling the energy storage equipment to charge or discharge according to the power change difference.
Optionally, the microgrid group controller is specifically configured to:
determining a disturbance value according to the power of the tie line and a reference value of the power of the tie line;
determining a power disturbance value distributed to each light storage diesel micro-grid according to the proportion of the rated capacity of the diesel generator of each light storage diesel micro-grid to the total rated capacity of the diesel generators of the light storage diesel micro-grid group and the disturbance value;
and generating a power adjusting instruction of each optical storage diesel-micro network according to the power disturbance value distributed to each optical storage diesel-micro network.
Alternatively to this, the first and second parts may,
the micro-grid group controller applies disturbance to each optical storage diesel micro-grid by sending a power adjusting instruction to each optical storage diesel micro-grid;
the local controller is further configured to:
controlling a diesel generator of the light storage diesel micro-grid to work in a droop mode;
determining the dynamic adjustment amount of the energy storage threshold of the energy storage system according to the droop coefficient and the disturbance value of the total droop curve of the diesel generator and the proportion of the rated capacity of the diesel generator to the total rated capacity of the diesel generator of the light storage diesel micro-grid group;
adjusting the threshold range of the energy storage system according to the dynamic adjustment amount;
and under the condition that the detected local bus voltage deviation value of the optical storage diesel micro-grid exceeds a preset value, controlling the energy storage system to participate in power regulation according to the adjusted threshold range.
Compared with the prior art, the invention has the following beneficial effects:
the invention discloses a two-stage cooperative control method for an optical storage diesel micro-grid group. Set up the crowd's controller of microgrid crowd and realize that light stores up crowd's level control between the firewood microgrid storing up in light, act on every light through the generation and store up the disturbance of firewood microgrid, make each light store up the firewood microgrid on the basis of network level control, carry out secondary cooperative control to photovoltaic unit, firewood unit and the energy storage system in the firewood microgrid storing up in the light, adjust its external output, make light store up the more reasonable effectual cooperative operation of firewood microgrid ability, improve the overall stability of system.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic diagram of a typical light-storage diesel micro-grid;
fig. 2 is a schematic structural diagram of a two-stage cooperative control system of an optical storage diesel micro grid group according to an embodiment of the present invention;
fig. 3 is a schematic partial structural diagram of a two-stage cooperative control system of an optical storage diesel micro grid group according to an embodiment of the present invention;
fig. 4 is a schematic flow chart of a two-stage cooperative control method for an optical storage diesel micro grid group according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a network level control flow disclosed in the embodiments of the present invention;
fig. 6 is a schematic bottom view of two-stage cooperative control of an optical storage diesel microgrid disclosed in the embodiment of the present invention;
fig. 7 is a schematic diagram of an upper layer of two-stage cooperative control of an optical storage diesel microgrid disclosed in the embodiment of the invention;
fig. 8 is a schematic diagram of an adaptive droop operation mechanism of a diesel generator according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention discloses a two-stage cooperative control method for an optical storage diesel micro-grid group, which is applied to a two-stage cooperative control system for the optical storage diesel micro-grid group, and please refer to fig. 2, the optical storage diesel micro-grid group cooperative control system comprises: referring to fig. 3, the light-storage diesel micro-grid is connected to each other through a connecting line, and energy mutual assistance is performed according to scheduling or control requirements. Each light stores up firewood microgrid includes: the system comprises a photovoltaic power generation unit, an energy storage system, a diesel generator and a local controller. Under the condition that the light stores up the firewood microgrid and is in off-network state, the two-stage cooperative control of light stores up the firewood microgrid crowd includes two-stage control: net-level control and group-level control. The diesel generator in the light storage diesel microgrid is used as a main voltage support, the energy storage system is used for power adjustment, network level control is achieved, secondary cooperative control is conducted on the photovoltaic power generation unit, the diesel generator and the energy storage system in the light storage diesel microgrid through the microgrid group controller, the external output power of the photovoltaic power generation unit, the diesel generator and the energy storage system is adjusted, and group level control is achieved.
Specifically, referring to fig. 4, a two-stage cooperative control method for an optical storage diesel micro grid group disclosed in the embodiment of the present invention includes the following steps:
s101: the local controller controls the voltage of the local bus by preferentially controlling the diesel generator in the light storage diesel micro-grid;
s102: under the condition that preset group level control conditions are met, the micro-grid group controller generates each power adjusting instruction of the light storage diesel micro-grid according to the power reference value of the connecting line and the rated capacity of the diesel generator of each light storage diesel micro-grid, and controls the output power of each light storage diesel micro-grid.
The preset group level control condition may be that a superior scheduling instruction is received, or may be a specification of a preset protocol.
The power reference value of the tie-line is derived from the upper scheduling instruction or the preset protocol.
Group level control is through generating the disturbance that acts on every light storage firewood microgrid, makes each light storage firewood microgrid carry out secondary cooperative control to photovoltaic unit, firewood unit and energy storage system in the light storage firewood microgrid on the basis of network level control, adjusts its external output, makes light storage firewood microgrid can more reasonable effectual cooperative operation, improves system overall stability.
Specifically, referring to fig. 5, the method for implementing local bus voltage control through network level control disclosed in this embodiment includes the following steps:
s201: the local controller controls the photovoltaic power generation unit to work in an MPPT mode, and controls the diesel generator to work in a droop mode;
the photovoltaic power generation unit works in an MPPT mode, power is automatically injected into a local bus, grid level control mainly comprises droop control of a diesel generator and threshold control of an energy storage system, and photovoltaic power generation can be regarded as a constant load in a transient time scale and is temporarily ignored in the embodiment.
Referring to the upper half of fig. 6, when the diesel generator operates in the voltage source mode, the primary frequency modulation device sends a droop control command to the diesel generator, where Rd is a static difference adjustment coefficient of the synchronous machine, that is, a droop coefficient. The primary frequency modulation device can obtain a new power reference after passing through a droop control algorithm, the new power reference is compared with the sampling power, the deviation is used as the disturbance quantity of a speed regulator of the diesel generator, the speed regulator can control the oil quantity of the diesel prime mover and the opening of a throttle valve so as to control the mechanical power Pm output by the prime mover, and finally the active power output of the synchronous generator is realized.
S202: the local controller judges whether the local bus voltage deviation value of the light storage diesel micro-grid exceeds a preset value;
if the preset value is exceeded, S203: the local controller controls the energy storage system to participate in power regulation;
if not, S204: the local controller controls the energy storage system to work in a P-Q mode.
It should be noted that when the local bus voltage deviation value does not exceed the preset value, it is indicated that the stable control of the local bus voltage can be realized only through the diesel generator, and the energy storage system is not needed to participate in the power regulation. The energy storage system is used as power standby control, frequent switching and use of the energy storage system are avoided, and the effective load carrying interval of the diesel generator is fully utilized, so that the service life of a battery in the energy storage system is prolonged, the capacity of the energy storage system can be reduced, and the economy of the light storage diesel micro-grid is improved.
The local controller mainly controls the energy storage system to perform threshold control to realize power adjustment, referring to the lower half of fig. 6, the slope of the threshold curve in the threshold control can be calculated by the following formula:
Figure BDA0002814604070000071
wherein k isIIs the slope of the threshold curve, RdiThe droop coefficient of the ith diesel generator in the light storage diesel microgrid, m is the number of the diesel generators contained in the light storage diesel microgrid, and fDZIs a threshold range.
The threshold control of the energy storage system specifically comprises: the local controller obtains a frequency change difference value of the optical storage diesel micro-grid, determines a power change difference value corresponding to the frequency change difference value according to a threshold curve of the energy storage device, and controls the energy storage device to charge or discharge according to the power change difference value. Specifically, when the system frequency drops beyond the discharge threshold of the energy storage system (i.e., -f)DZ) When the system frequency exceeds the energy storage threshold (i.e. f) of the energy storage system, the energy storage system is controlled to start dischargingDZ) And controlling the energy storage system to start charging.
Specifically, referring to fig. 7, in a case where the group-level control is applied to the bottom layer, the microgrid group controller obtains a power reference value of the tie line and generates a disturbance Δ P according to the power reference value of the tie line in a case where a higher-level scheduling instruction is received or a rule of a preset protocol is satisfiedline. Wherein, the power reference value of the tie line is derived from the upper scheduling instruction or the preset protocol.
ΔPlineActing on the bottom layer, the ratio distributed to each diesel generator is alphanFromThe ratio of the rated capacity of each diesel generator to the total capacity of the diesel generator, alphanThe calculation formula of (a) is as follows:
Figure BDA0002814604070000081
wherein, PDGnRepresenting the total capacity, P, of the diesel generatorDGiIndicates the rated capacity of the ith diesel generator, and n indicates the total number of diesel generators.
The disturbance acting on the diesel generator causes the diesel generator to operate in an adaptive droop mode, and then the diesel generator increases or decreases its output power to achieve control of the tie-line power.
The power flow control, that is, the disturbance acting on the diesel generator will affect the initial cooperation mechanism between the diesel generator and the energy storage system, as shown in fig. 8, wherein the black thin line is the total droop characteristic curve presented by the whole light storage diesel microgrid, the light storage diesel microgrid controls the increase and decrease of the output current through self-adaptive droop, and then the tie line power is controlled, and the total droop characteristic curve of the light storage diesel microgrid moves as indicated by the black thick line. Thus, with a constant total capacity within the optical diesel microgrid, the energy reserve will decrease and the entire optical diesel microgrid will reach a maximum output in advance when faced with disturbances. At this point, the local bus voltage may not drop to the initial threshold range of the energy storage system. Therefore, in order to ensure that the deviation of the bus frequency is within a certain range and simultaneously ensure that the photovoltaic output does not exceed a limit value, the threshold range of the energy storage system is secondarily coordinated to match the change of the operating curve of the diesel generating unit.
The upper half of fig. 7 shows the coordination process of the energy storage threshold control, which dynamically adjusts the threshold range according to the change amount of the power flow control to the diesel engine droop curve, so as to realize the dynamic matching with the diesel engine droop curve.
Droop coefficient R of total droop curve of diesel generatorTotalThe calculation formula of (a) is as follows:
Figure BDA0002814604070000082
wherein R isdnThe droop coefficient of the nth diesel generator in the light storage diesel microgrid is shown, and n is the number of the diesel generators contained in the light storage diesel microgrid.
Droop coefficient R based on total droop curve of diesel generatorTotalDisturbance Δ PlineAnd the proportional coefficient beta of the power of the tie line required to bear by each light storage diesel micro-gridlCalculating the dynamic adjustment quantity delta f of the energy storage threshold valueDZThe calculation formula of (a) is as follows:
ΔfDZ＝ΔPline*RTotal*βl
dynamic adjustment amount delta f according to energy storage threshold valueDZThe threshold range f can be adjustedDZ。
The embodiment discloses a two-stage cooperative control system of light-storage diesel micro-grid group, including: the system comprises a microgrid group controller, a communication system and at least two light storage diesel microgrids in an off-network state;
the micro-grid group controller is in communication connection with each light-storage diesel micro-grid through the communication system;
the light storage diesel micro-grid is connected with each other through a connecting line;
each light-storage diesel micro-grid comprises a photovoltaic power generation unit, an energy storage system, a diesel generator and a local controller;
the local controller is used for controlling the local bus voltage by preferentially controlling the diesel generator in the optical storage diesel micro-grid;
under the condition of receiving higher level's scheduling instruction, microgrid group controller for satisfying the condition of predetermineeing the crowd level control condition, according to the power reference value of tie-line and every the firewood microgrid is stored to light the rated capacity of diesel generator, generate every the power regulation instruction of firewood microgrid is stored to light, every the output of firewood microgrid is stored to light is controlled.
Optionally, the local controller is specifically configured to:
controlling the photovoltaic power generation unit to work in an MPPT mode, and controlling the diesel generator to work in a droop mode;
judging whether the local bus voltage deviation value of the optical storage diesel micro-grid exceeds a preset value;
if the power consumption exceeds a preset value, the local controller controls the energy storage system to participate in power regulation;
and if the preset value is not exceeded, the local controller controls the energy storage system to work in a P-Q mode.
The local controller is specifically configured to: acquiring a frequency change difference value of the optical storage diesel micro-grid;
determining a power change difference value corresponding to the frequency change difference value according to a threshold value curve of the energy storage device, wherein the slope of the threshold value curve is the sum of reciprocals of droop coefficients of each diesel generator in the optical storage diesel-electric micro grid;
and controlling the energy storage equipment to charge or discharge according to the power change difference.
Optionally, the microgrid group controller is specifically configured to:
determining a disturbance value according to the power of the tie line and a reference value of the power of the tie line;
determining a power disturbance value distributed to each light storage diesel micro-grid according to the proportion of the rated capacity of the diesel generator of each light storage diesel micro-grid to the total rated capacity of the diesel generators of the light storage diesel micro-grid group and the disturbance value;
and generating a power adjusting instruction of each optical storage diesel-micro network according to the power disturbance value distributed to each optical storage diesel-micro network.
Alternatively to this, the first and second parts may,
the micro-grid group controller applies disturbance to each optical storage diesel micro-grid by sending a power adjusting instruction to each optical storage diesel micro-grid;
the local controller is further configured to:
controlling a diesel generator of the light storage diesel micro-grid to work in a droop mode;
determining the dynamic adjustment amount of the energy storage threshold of the energy storage system according to the droop coefficient and the disturbance value of the total droop curve of the diesel generator and the proportion of the rated capacity of the diesel generator to the total rated capacity of the diesel generator of the light storage diesel micro-grid group;
adjusting the threshold range of the energy storage system according to the dynamic adjustment amount;
and under the condition that the detected local bus voltage deviation value of the optical storage diesel micro-grid exceeds a preset value, controlling the energy storage system to participate in power regulation according to the adjusted threshold range.
The utility model discloses a two-stage cooperative control system of firewood microgrid crowd is stored up to light, stores up the inside network level control that realizes of firewood microgrid at light, and local controller controls local bus voltage through the diesel generator who controls in the light storage firewood microgrid of place, reduces the use to energy storage system. Set up the crowd's controller of microgrid crowd and realize that light stores up crowd's level control between the firewood microgrid storing up in light, act on every light through the generation and store up the disturbance of firewood microgrid, make each light store up the firewood microgrid on the basis of network level control, carry out secondary cooperative control to photovoltaic unit, firewood unit and the energy storage system in the firewood microgrid storing up in the light, adjust its external output, make light store up the more reasonable effectual cooperative operation of firewood microgrid ability, improve the overall stability of system.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
It is further noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. A software module may reside in Random Access Memory (RAM), memory, Read Only Memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.
The above embodiments can be combined arbitrarily, and the features described in the embodiments in the present specification can be replaced or combined with each other in the above description of the disclosed embodiments, so that those skilled in the art can implement or use the present application.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. The utility model provides a two-stage cooperative control method of light storage firewood microgrid crowd, its characterized in that is applied to two-stage cooperative control system of light storage firewood microgrid crowd, light storage firewood microgrid crowd two-stage cooperative control system includes microgrid crowd controller and at least two light storage firewood microgrids under the off-network state, each light storage firewood microgrid passes through the tie line and links to each other, every light storage firewood microgrid includes photovoltaic power generation unit, energy storage system, diesel generator and local controller, the method includes:
the local controller controls the local bus voltage by preferentially controlling the diesel generator in the optical storage diesel micro-grid;
under the condition that satisfies preset crowd level control condition, microgrid crowd's controller basis the power reference value and every of junctor the light stores up the firewood microgrid the rated capacity of diesel generator generates every the power regulation instruction of light storage firewood microgrid is every the output power of light storage firewood microgrid controls.
2. The method of claim 1, wherein the local controller controls the local bus voltage by prioritizing control of the diesel generators in the light-storing diesel microgrid, comprising:
the local controller controls the photovoltaic power generation unit to work in an MPPT mode, and controls the diesel generator to work in a droop mode;
the local controller judges whether the local bus voltage deviation value of the light storage diesel micro-grid exceeds a preset value;
if the power consumption exceeds a preset value, the local controller controls the energy storage system to participate in power regulation;
and if the preset value is not exceeded, the local controller controls the energy storage system to work in a P-Q mode.
3. The method of claim 2, wherein the local controller controls the energy storage device to participate in power regulation, comprising:
the local controller acquires a frequency change difference value of the optical storage diesel micro-grid;
the local control determines a power change difference value corresponding to the frequency change difference value according to a threshold value curve of the energy storage equipment, wherein the slope of the threshold value curve is the sum of reciprocals of droop coefficients of each diesel generator in the optical storage diesel-electric micro grid;
and the local controller controls the energy storage equipment to charge or discharge according to the power change difference.
4. The method of claim 1, wherein the microgrid group controller generates power regulation instructions for each of the optical storage diesel microgrid based on a power reference value of the tie line and a rated capacity of the diesel generator of each of the optical storage diesel microgrid, comprising:
the microgrid group controller determines a disturbance value according to the power of the tie line and the power reference value of the tie line;
the micro-grid group controller determines a power disturbance value distributed to each light-storage diesel micro-grid according to the proportion of the rated capacity of the diesel generator of each light-storage diesel micro-grid to the total rated capacity of the diesel generators of the light-storage diesel micro-grid group and the disturbance value;
and the micro-grid group controller generates a power adjusting instruction of each light storage diesel micro-grid according to the power disturbance value distributed to each light storage diesel micro-grid.
5. The method of claim 4, wherein the microgrid group controller generates power adjustment instructions for each of the optical storage diesel microgrid to control output power of each of the optical storage diesel microgrid, comprising:
the micro-grid group controller applies disturbance to each optical storage diesel micro-grid by sending a power adjusting instruction to each optical storage diesel micro-grid;
the local controller controls the diesel generator of the light storage diesel micro-grid to work in a downward hanging mode;
the local controller determines the dynamic adjustment quantity of the energy storage threshold of the energy storage system according to the droop coefficient and the disturbance value of the total droop curve of the diesel generator and the proportion of the rated capacity of the diesel generator to the total rated capacity of the diesel generator of the light storage diesel micro-grid group;
the local controller adjusts the threshold range of the energy storage system according to the dynamic adjustment amount;
and the local controller controls the energy storage system to participate in power regulation according to the adjusted threshold range under the condition that the local bus voltage deviation value of the optical storage diesel micro-grid is detected to exceed a preset value.
6. The utility model provides a two-stage cooperative control system of firewood microgrid crowd is stored up to light which characterized in that includes: the system comprises a microgrid group controller, a communication system and at least two light storage diesel microgrids in an off-network state;
the micro-grid group controller is in communication connection with each light-storage diesel micro-grid through the communication system;
the light storage diesel micro-grid is connected with each other through a connecting line;
each light-storage diesel micro-grid comprises a photovoltaic power generation unit, an energy storage system, a diesel generator and a local controller;
the local controller is used for controlling the local bus voltage by preferentially controlling the diesel generator in the optical storage diesel micro-grid;
the microgrid cluster controller is used for meeting the condition of a preset cluster level control condition, generating power adjusting instructions of the light storage diesel microgrid according to the power reference value and each of the tie lines and the rated capacity of the diesel generator, and controlling the output power of the light storage diesel microgrid.
7. The system of claim 6, wherein the local controller is specifically configured to:
controlling the photovoltaic power generation unit to work in an MPPT mode, and controlling the diesel generator to work in a droop mode;
judging whether the local bus voltage deviation value of the optical storage diesel micro-grid exceeds a preset value;
if the power consumption exceeds a preset value, the local controller controls the energy storage system to participate in power regulation;
and if the preset value is not exceeded, the local controller controls the energy storage system to work in a P-Q mode.
8. The system of claim 7, wherein the local controller is specifically configured to: acquiring a frequency change difference value of the optical storage diesel micro-grid;
determining a power change difference value corresponding to the frequency change difference value according to a threshold value curve of the energy storage device, wherein the slope of the threshold value curve is the sum of reciprocals of droop coefficients of each diesel generator in the optical storage diesel-electric micro grid;
and controlling the energy storage equipment to charge or discharge according to the power change difference.
9. The system of claim 6, wherein the microgrid group controller is specifically configured to:
determining a disturbance value according to the power of the tie line and a reference value of the power of the tie line;
determining a power disturbance value distributed to each light storage diesel micro-grid according to the proportion of the rated capacity of the diesel generator of each light storage diesel micro-grid to the total rated capacity of the diesel generators of the light storage diesel micro-grid group and the disturbance value;
and generating a power adjusting instruction of each optical storage diesel-micro network according to the power disturbance value distributed to each optical storage diesel-micro network.
10. The system of claim 9,
the micro-grid group controller applies disturbance to each optical storage diesel micro-grid by sending a power adjusting instruction to each optical storage diesel micro-grid;
the local controller is further configured to:
controlling a diesel generator of the light storage diesel micro-grid to work in a droop mode;
determining the dynamic adjustment amount of the energy storage threshold of the energy storage system according to the droop coefficient and the disturbance value of the total droop curve of the diesel generator and the proportion of the rated capacity of the diesel generator to the total rated capacity of the diesel generator of the light storage diesel micro-grid group;
adjusting the threshold range of the energy storage system according to the dynamic adjustment amount;
and under the condition that the detected local bus voltage deviation value of the optical storage diesel micro-grid exceeds a preset value, controlling the energy storage system to participate in power regulation according to the adjusted threshold range.
CN202011410260.8A 2020-12-03 2020-12-03 Two-stage cooperative control method and system for optical firewood storage micro-grid group Active CN112467804B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202011410260.8A CN112467804B (en) 2020-12-03 2020-12-03 Two-stage cooperative control method and system for optical firewood storage micro-grid group

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202011410260.8A CN112467804B (en) 2020-12-03 2020-12-03 Two-stage cooperative control method and system for optical firewood storage micro-grid group

Publications (2)

Publication Number Publication Date
CN112467804A true CN112467804A (en) 2021-03-09
CN112467804B CN112467804B (en) 2023-05-30

Family

ID=74805897

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202011410260.8A Active CN112467804B (en) 2020-12-03 2020-12-03 Two-stage cooperative control method and system for optical firewood storage micro-grid group

Country Status (1)

Country Link
CN (1) CN112467804B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113394770A (en) * 2021-05-31 2021-09-14 南方电网海上风电联合开发有限公司 Interconnected micro-grid group frequency complete distribution type optimization control method and system

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102709906A (en) * 2012-05-14 2012-10-03 南方电网科学研究院有限责任公司 Frequency layering coordination control method suitable for isolated microgrid including diesel generator and battery storage
WO2018122726A1 (en) * 2016-12-28 2018-07-05 Electro Power Systems Manufacturing S.r.L. Control system for microgrids for the production and distribution of electric power coming from multiple production sources of different types, and control method thereof
CN108258728A (en) * 2018-01-29 2018-07-06 中国人民解放军军事科学院国防工程研究院 A kind of control method of the adjustable degree type wind-solar-diesel storage independent micro-grid based on droop control
CN111224428A (en) * 2020-03-02 2020-06-02 合肥阳光新能源科技有限公司 Light storage diesel micro-grid system and control method thereof
CN111628522A (en) * 2020-04-27 2020-09-04 合肥阳光新能源科技有限公司 Light storage diesel micro-grid system and control method thereof

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102709906A (en) * 2012-05-14 2012-10-03 南方电网科学研究院有限责任公司 Frequency layering coordination control method suitable for isolated microgrid including diesel generator and battery storage
WO2018122726A1 (en) * 2016-12-28 2018-07-05 Electro Power Systems Manufacturing S.r.L. Control system for microgrids for the production and distribution of electric power coming from multiple production sources of different types, and control method thereof
CN108258728A (en) * 2018-01-29 2018-07-06 中国人民解放军军事科学院国防工程研究院 A kind of control method of the adjustable degree type wind-solar-diesel storage independent micro-grid based on droop control
CN111224428A (en) * 2020-03-02 2020-06-02 合肥阳光新能源科技有限公司 Light storage diesel micro-grid system and control method thereof
CN111628522A (en) * 2020-04-27 2020-09-04 合肥阳光新能源科技有限公司 Light storage diesel micro-grid system and control method thereof

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
王亭岭等: "孤岛交流微电网光储协调控制", 《电力科学与工程》 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113394770A (en) * 2021-05-31 2021-09-14 南方电网海上风电联合开发有限公司 Interconnected micro-grid group frequency complete distribution type optimization control method and system

Also Published As

Publication number Publication date
CN112467804B (en) 2023-05-30

Similar Documents

Publication Publication Date Title
Zhang et al. Coordinated control for voltage regulation of distribution network voltage regulation by distributed energy storage systems
Pannala et al. Effective control and management scheme for isolated and grid connected DC microgrid
Schonbergerschonberger et al. DC-bus signaling: A distributed control strategy for a hybrid renewable nanogrid
Kim et al. Dynamic modeling and control of a grid-connected hybrid generation system with versatile power transfer
AU2014296613B2 (en) Microgrid energy management system and method for controlling operation of a microgrid
CN106786490A (en) Distributed DC microgrid energy control method
US20180013286A1 (en) Distributed electrical microgrid control
US9898018B2 (en) Power clipping method and system
JP2001327080A (en) Power storage device and control method of distributed power supply system equipped therewith
Sun et al. Implementation and CHIL testing of a microgrid control system
CN109888845B (en) AC/DC hybrid micro-grid
Samson et al. Optimal load sharing strategy in a hybrid power system based on pv/fuel cell/battery/supercapacitor
Mobarrez et al. Implementation of distributed power balancing strategy with a layer of supervision in a low-voltage DC microgrid
Tokudome et al. Frequency and voltage control of small power systems by decentralized controllable loads
CN111900710A (en) Grid-connected direct-current micro-grid coordination control method
Pandi et al. Adaptive coordinated feeder flow control in distribution system with the support of distributed energy resources
CN112467804B (en) Two-stage cooperative control method and system for optical firewood storage micro-grid group
Tagayi et al. Binary-phase service battery energy storage system strategy for peak demand shaving and enhanced power quality
Abbey et al. Energy management strategies for optimization of energy storage in wind power hybrid system
Teo et al. Modelling and optimisation of stand alone power generation at rural area
Kumar et al. Energy Management of PV-Grid-Integrated Microgrid with Hybrid Energy Storage System
AU2010358881B2 (en) Management system for variable-resource energy generation systems
CN110994655A (en) Centralized coordination control method for distributed power supply
JP2020184851A (en) Dc power network and control system of dc power network
Bhuvaneswari et al. Hybrid wind–diesel energy systems

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
CB02 Change of applicant information

Address after: High tech Zone of Hefei city of Anhui Province in 230088 Lake Road No. 2

Applicant after: Sunshine New Energy Development Co.,Ltd.

Address before: 230088 2nd floor, scientific research building, sunshine power plant, No.2 Tianhu Road, high tech Zone, Hefei City, Anhui Province

Applicant before: HEFEI SUNGROW RENEWABLE ENERGY SCI. & TECH. Co.,Ltd.

Address after: High tech Zone of Hefei city of Anhui Province in 230088 Lake Road No. 2

Applicant after: Sunshine New Energy Development Co.,Ltd.

Address before: High tech Zone of Hefei city of Anhui Province in 230088 Lake Road No. 2

Applicant before: Sunshine New Energy Development Co.,Ltd.

CB02 Change of applicant information
GR01 Patent grant
GR01 Patent grant