CN109698519A - A kind of accumulation energy type photovoltaic plant starting method and system supporting power grid"black-start" - Google Patents
A kind of accumulation energy type photovoltaic plant starting method and system supporting power grid"black-start" Download PDFInfo
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- CN109698519A CN109698519A CN201710997335.9A CN201710997335A CN109698519A CN 109698519 A CN109698519 A CN 109698519A CN 201710997335 A CN201710997335 A CN 201710997335A CN 109698519 A CN109698519 A CN 109698519A
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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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- 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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Abstract
The present invention relates to a kind of accumulation energy type photovoltaic plants for supporting power grid"black-start" to start method and system, this method comprises: when grid collapses, when the continuous and effective power output of photovoltaic plant in accumulation energy type photovoltaic plant meets according to the first determining criterion of photovoltaic plant continuous and effective power output, black starting-up power supply of the photovoltaic plant as power system restoration is selected；The starting strategy of energy-storage system in accumulation energy type photovoltaic plant is determined according to the real-time voltage of accumulation energy type photovoltaic plant, starts energy-storage system；It determines the corresponding initial state of charge of energy-storage system of maximum starting quantity of the maximum starting quantity and photovoltaic DC-to-AC converter of photovoltaic DC-to-AC converter, and restores operation of power networks using the photovoltaic DC-to-AC converter of starting.This method realizes the black starting-up of power grid by configuring the photovoltaic plant energy storage association system of energy accumulation current converter, under the premise of guaranteeing voltage, the frequency stabilization of system, controllability, the vulnerability to jamming of photovoltaic plant are improved, to make photovoltaic plant black starting-up and quickly restore regional power grid, reduces loss of outage.
Description
Technical field
The present invention relates to generation of electricity by new energy and technical field of energy storage, in particular to a kind of energy storage for supporting power grid"black-start"
Type photovoltaic plant starts method and system.
Background technique
With the growth of power demand, the scale of electric system constantly expands, and internetwork connection is increasingly close, occurs big
The probability of area power outage also gradually rises, and has higher requirement to the power supply reliability of electric system, fast and effeciently
Restoring power grid power supply is to reduce causality loss most efficient method.Power grid"black-start" refers to that whole system or power grid are most of for some reason
After barrier is stopped transport, the unit of non self starting is driven by the unit (black starting-up unit) in system with self-startup ability, so
The recovery range of system is gradually expanded afterwards, the final recovery for realizing whole system.Power grid"black-start" process is generally divided into three ranks
Section: black starting-up stage, rack reconstruction stage, load restoration stage.Power grid realizes that the primary condition of black starting-up most critical is desirable
Reliable black starting-up power supply is provided.In recent years, photovoltaic power generation is grown rapidly in China, increasingly with photovoltaic power generation technology
Maturation sufficiently excavates its ability for supporting power grid"black-start", new thinking is provided for power system recovery.
Currently, participating in power grid"black-start" technology for photovoltaic plant both at home and abroad lacks system and in-depth study, related work
Urgently carry out；Due to the fluctuation of photovoltaic power generation power output, intermittent feature, photovoltaic electric in traditional network system starting method
The voltage and frequency stabilization of system cannot be effectively ensured by standing when supporting power grid"black-start" separately as black starting-up power supply；Therefore, it needs
The stabilization of power grids can be guaranteed and efficiently restore photovoltaic plant starting method by providing one kind.
Summary of the invention
It is an object of the invention to propose a kind of support power grid that can guarantee the stabilization of power grids and quick start photovoltaic plant
The accumulation energy type photovoltaic plant of black starting-up starts method and system.
The purpose of the present invention is adopt the following technical solutions realization:
A kind of accumulation energy type photovoltaic plant starting method and system supporting power grid"black-start", it is improved in that described
Method includes:
When grid collapses, sentence when the continuous and effective power output of photovoltaic plant in the accumulation energy type photovoltaic plant meets first
According to when, select black starting-up power supply of the photovoltaic plant as power system restoration；
Opening for energy-storage system in the accumulation energy type photovoltaic plant is determined according to the real-time voltage of the accumulation energy type photovoltaic plant
Dynamic strategy, starts energy-storage system；
Determine that the maximum starting quantity of photovoltaic DC-to-AC converter and the photovoltaic are inverse in accumulation energy type photovoltaic plant according to Second Criterion
Become the corresponding initial state of charge of energy-storage system of maximum starting quantity of device, and restores power grid using the photovoltaic DC-to-AC converter of starting
Operation；
Preferably, first criterion, such as following formula::
min{PPV(m)}≥Pst
In formula, min { PPV(m) } it contributes for photovoltaic plant continuous and effective, PpvIt (m) is to connect since the power grid"black-start" moment
Photovoltaic power prediction data in the continuous period, m are that the photovoltaic power since the power grid"black-start" moment in continuous time predicts number
According to the set of composition；PstFor the auxiliary system power of conventional power unit；
Preferably, the real-time voltage according to accumulation energy type photovoltaic plant determines energy storage system in the accumulation energy type photovoltaic plant
The starting strategy of system, comprising:
The real-time voltage of the accumulation energy type photovoltaic plant is detected, it is pre- same using energy storage if detecting the real-time voltage
Step starting strategy starts the energy-storage system, if the real-time voltage is not detected, using three-phase independently sagging control starting
The energy-storage system.
Preferably, it is described according to Second Criterion determine photovoltaic DC-to-AC converter in accumulation energy type photovoltaic plant maximum starting quantity and
The corresponding initial state of charge of energy-storage system of maximum starting quantity of the photovoltaic DC-to-AC converter, and utilize the photovoltaic inversion of starting
Device restores operation of power networks, comprising:
S1. the maximum for being currently up the photovoltaic DC-to-AC converter for meeting the Second Criterion in period i is obtained according to Second Criterion
Start quantity and the initial state of charge of energy-storage system；
S2. compare the current state of charge S of energy-storage systemnow(i) with initial state of charge S0(i) value whether phase
Deng；
If Snow(i)≠S0(i), discharge condition is currently at for energy-storage system, then enabling energy-storage system is photovoltaic inversion
Device, which charges to, is currently up end cycle, enables i=i+1, and jump procedure S1；Charged state is currently at for energy-storage system
, then it enables the photovoltaic DC-to-AC converter pre-actuated charge to for energy-storage system and is currently up end cycle, enable i=i+1, and jump step
Rapid S1, the photovoltaic DC-to-AC converter quantity pre-actuated are determined within first starting period；
Until Snow(i)=S0(i), then the photovoltaic DC-to-AC converter for the maximum starting quantity that starting step S1 is determined, and restore electricity
Net operation.
Further, the Second Criterion, such as following formula:
In formula, PGIt (m) is the force data out of conventional power unit in photovoltaic plant in starting period i；PPVIt (m) is starting period i
Interior predicting power of photovoltaic plant data；N is the starting number of units of photovoltaic DC-to-AC converter；S0(i) initial for energy-storage system in starting period i
State of charge；SminAnd SmaxThe respectively minimum and maximum state of charge of energy-storage system；PESNFor the specified function of energy-storage system
Rate；ENFor energy-storage system rated capacity；Ts is predicting power of photovoltaic plant data sampling period, PstFor the subsidiary engine system of conventional power unit
System power.
Further, the energy-storage system is currently at discharge condition or the Rule of judgment of charged state includes:
If Snow(i) > S0(i), the energy-storage system is currently at discharge condition；Otherwise, the energy-storage system is currently located
In charged state.
Further, it is determined that the photovoltaic DC-to-AC converter quantity pre-actuated includes:
According to the minimum operation power allowances of energy storage system capacity and photovoltaic DC-to-AC converter, the photovoltaic for needing to pre-actuate is determined
The power output of inverter number and each inverter.
A kind of accumulation energy type photovoltaic plant activation system supporting power grid"black-start", the system comprises:
The analysis of predicting power of photovoltaic plant data and evaluation module, for when photovoltaic plant in the accumulation energy type photovoltaic plant
Continuous and effective power output meet the first criterion when, select black starting-up power supply of the photovoltaic plant as power system restoration；
Energy-storage system starts judgment module, for determining the energy storage according to the real-time voltage of the accumulation energy type photovoltaic plant
The starting strategy of energy-storage system in type photovoltaic plant；
Photovoltaic plant starting capacity and timing computing module, for determining that the maximum of photovoltaic DC-to-AC converter opens according to Second Criterion
The corresponding initial state of charge of energy-storage system of the maximum starting quantity of dynamic quantity and the photovoltaic DC-to-AC converter, and utilize starting
Photovoltaic DC-to-AC converter restores operation of power networks.
Further, the predicting power of photovoltaic plant data analysis and evaluation module include:
Analytical unit determines that the photovoltaic plant persistently has for analyzing as the following formula according to predicting power of photovoltaic plant data
Effect power output:
min{PPV(m)}
Assessment unit, for determining first criterion: min { P according to photovoltaic plant continuous and effective power output as the following formulaPV
(m)}≥Pst
In formula, PpvIt (m) is the photovoltaic power prediction data since the power grid"black-start" moment in continuous time, m is from electricity
The net black starting-up moment starts the set of the composition of the photovoltaic power prediction data in continuous time；PstFor the auxiliary system of conventional power unit
Power, m=0,1,2 ... M；
Further, the energy-storage system starting judgment module includes:
Detection unit, for detecting the real-time voltage of the accumulation energy type photovoltaic plant；
Start unit, for starting the energy-storage system according to the real-time voltage of the accumulation energy type photovoltaic plant；
If detecting the real-time voltage, the energy-storage system is started using energy storage presynchronization starting strategy, if not examining
The real-time voltage is measured, then independently sagging control starts the energy-storage system using three-phase.
Further, the photovoltaic plant starting capacity and timing computing module include:
First computing unit, for inverse according to the photovoltaic for meeting the Second Criterion in Second Criterion acquisition starting period i
Become the maximum starting quantity and the initial state of charge of energy-storage system of device, wherein i takes positive integer, initial value 1；
Judging unit, for comparing the current value S of energy-storage systemnow(i) and initial state-of-charge S0(i) value whether phase
Deng；
First execution unit, for working as Snow(i)≠S0(i), discharge condition is currently at for energy-storage system, then enabled
Energy-storage system charges to for photovoltaic DC-to-AC converter and is currently up end cycle, enables i=i+1；Charging is currently at for energy-storage system
State, then it enables the photovoltaic DC-to-AC converter for pre-actuating quantity charge to for energy-storage system and is currently up end cycle, enable i=i+1；
Second execution unit, for working as Snow(i)=S0(i), then the photovoltaic inversion obtained according to first computing unit
Device maximum starts quantity and starts photovoltaic DC-to-AC converter, and restores operation of power networks；
Second computing unit, for being transported in the first starting period according to energy storage system capacity and the minimum of photovoltaic DC-to-AC converter
Row power allowances determine the power output for needing the photovoltaic DC-to-AC converter quantity and each inverter that pre-actuate.
Further, the Second Criterion determines as the following formula:
In formula, PGIt (m) is the force data out of conventional power unit in starting period i；PPVIt (m) is photovoltaic plant in starting period i
Power prediction data；N is the starting number of units of photovoltaic DC-to-AC converter；S0It (i) is the initial state-of-charge of energy-storage system in starting period i
Value；SminAnd SmaxThe respectively minimum and maximum limit value of energy-storage system；PESNFor energy-storage system rated power；ENFor energy-storage system
Rated capacity；Ts is predicting power of photovoltaic plant data sampling period.
Compared with prior art, the invention has the following beneficial effects:
When grid collapses, sentence when the continuous and effective power output of photovoltaic plant in the accumulation energy type photovoltaic plant meets first
According to when, select black starting-up power supply of the photovoltaic plant as power system restoration；
Opening for energy-storage system in the accumulation energy type photovoltaic plant is determined according to the real-time voltage of the accumulation energy type photovoltaic plant
Dynamic strategy, starts energy-storage system；
Determine that the maximum starting quantity of photovoltaic DC-to-AC converter and the photovoltaic are inverse in accumulation energy type photovoltaic plant according to Second Criterion
Become the corresponding initial state of charge of energy-storage system of maximum starting quantity of device, and restores power grid using the photovoltaic DC-to-AC converter of starting
Operation；
Wherein, first criterion is contributed according to photovoltaic plant continuous and effective and is determined.
The technical solution that the application uses, in grid collapses, when photovoltaic plant in the accumulation energy type photovoltaic plant
Continuous and effective power output meet the first criterion when, select black starting-up power supply of the photovoltaic plant as power system restoration；According to institute
The real-time voltage for stating accumulation energy type photovoltaic plant determines the starting strategy of energy-storage system in the accumulation energy type photovoltaic plant, starts energy storage
System；The maximum starting quantity of photovoltaic DC-to-AC converter and the maximum starting quantity pair of the photovoltaic DC-to-AC converter are determined according to Second Criterion
The initial state of charge of the energy-storage system answered, and restore operation of power networks using the photovoltaic DC-to-AC converter of starting；Technical side of the invention
Under the premise of case determines photovoltaic plant as black starting-up power supply according to photovoltaic effective output, it can guarantee the stabilization of power grids and quickly open
Dynamic photovoltaic plant.
The technical solution that the application uses, builds pressure by energy-storage system self-starting, provides startup environment for photovoltaic plant, and
It makes full use of the energy-storage system voltage of configuration and frequency adjusts and fast charging and discharging characteristic, calculated, realized by accurate capacity
The optimal startup of photovoltaic plant reduces starting percussion, provides fastly for power grid to maximally utilize photovoltaic plant power output
Fast, effective black starting-up power reduces failure damage rate.
Detailed description of the invention
Fig. 1 is a kind of flow chart for the accumulation energy type photovoltaic plant starting method for supporting power grid"black-start" of the present invention；
Fig. 2 is a kind of detail process signal for the accumulation energy type photovoltaic plant starting method for supporting power grid"black-start" of the present invention
Figure；
Fig. 3 is a kind of structural schematic diagram for the accumulation energy type photovoltaic plant activation system for supporting power grid"black-start" of the present invention.
Specific embodiment
It elaborates with reference to the accompanying drawing to a specific embodiment of the invention.
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art
All other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
After power grid"black-start" refers to whole system or the most of stoppage in transit because of failure of power grid, by having self-starting energy in system
The unit (black starting-up unit) of power drives the unit of non self starting, and the recovery range of system is gradually expanded, finally realizes whole
The recovery of a system.Power grid"black-start" process is generally divided into three phases: black starting-up stage, rack reconstruction stage, load restoration
Stage.
The present invention provides a kind of accumulation energy type photovoltaic plants for supporting power grid"black-start" to start method and system, carries out below
Explanation.
Fig. 1 shows the process that the accumulation energy type photovoltaic plant starting method of power grid"black-start" is supported in the embodiment of the present invention
Figure, as shown in Figure 1, the method may include:
When grid collapses, sentence when the continuous and effective power output of photovoltaic plant in the accumulation energy type photovoltaic plant meets first
According to when, select black starting-up power supply of the photovoltaic plant as power system restoration；
Opening for energy-storage system in the accumulation energy type photovoltaic plant is determined according to the real-time voltage of the accumulation energy type photovoltaic plant
Dynamic strategy, starts energy-storage system；
Determine that the maximum starting quantity of photovoltaic DC-to-AC converter and the photovoltaic are inverse in accumulation energy type photovoltaic plant according to Second Criterion
Become the corresponding initial state of charge of energy-storage system of maximum starting quantity of device, and restores power grid using the photovoltaic DC-to-AC converter of starting
Operation；
Fig. 2 shows it is of the invention it is a kind of support power grid"black-start" accumulation energy type photovoltaic plant starting method detail process show
It is intended to, when electric system, which is broken down, stops transport, as shown in Fig. 2, carrying out photovoltaic plant according to predicting power of photovoltaic plant data
The analysis and assessment of continuous and effective power output judge whether to use photovoltaic plant as black starting-up power supply using this:
According to photovoltaic plant as black starting-up power supply, then enter black starting-up step；
Otherwise, using traditional power grid"black-start" process.
The analysis of photovoltaic plant continuous and effective power output referred to since the power grid"black-start" moment in the present invention, light in continuous time
The analysis of power prediction data is lied prostrate, continuous time can be set as the conventional power unit starting limitation time；
Specifically, first criterion can be determined according to photovoltaic plant continuous and effective power output as the following formula:
min{PPV(m)}≥Pst
In formula, min { PPV(m) } it contributes for photovoltaic plant continuous and effective, PpvIt (m) is to connect since the power grid"black-start" moment
Photovoltaic power prediction data in the continuous period, m are that the photovoltaic power since the power grid"black-start" moment in continuous time predicts number
According to the set of composition, m=0,1,2 ... M, M are photovoltaic power prediction data number in continuous time, PstFor the auxiliary of conventional power unit
Machine system power.
Preferably, the real-time voltage according to accumulation energy type photovoltaic plant determines energy storage system in the accumulation energy type photovoltaic plant
The starting strategy of system may include:
The real-time voltage for detecting the accumulation energy type photovoltaic plant judges whether system has it when the starting of current energy accumulation current converter
He has been turned on success by current transformer, if detecting the real-time voltage, starts the energy storage using energy storage presynchronization starting strategy
System, if the real-time voltage is not detected, using three-phase, independently sagging control starts the energy-storage system.
Preferably, it is described according to Second Criterion determine photovoltaic DC-to-AC converter maximum starting quantity and the photovoltaic DC-to-AC converter
The corresponding initial state of charge of energy-storage system of maximum starting quantity, and restore operation of power networks using the photovoltaic DC-to-AC converter of starting,
Include:
S1. the maximum for being currently up the photovoltaic DC-to-AC converter for meeting the Second Criterion in period i is obtained according to Second Criterion
Start quantity and the initial state of charge of energy-storage system；
Specifically, the start up curve and climbing characteristic for considering conventional power unit to be launched, according to the starting time of auxiliary system
With the capacity and limit value of startup power constraint, energy-storage system, the conventional power unit to be launched starting time refers to from subsidiary engine in the present invention
System starts to conventional power unit and climbs duration when reaching auxiliary system power to power output.Start the time with auxiliary system
It is maximally utilized with photovoltaic power generation as target according to the power prediction data of photovoltaic plant for a starting period, carries out i-th
The accounting of the discharge and recharge of energy-storage system, determines the capacity for needing photovoltaic plant to be started, i.e. photovoltaic inversion in a starting period
The starting number of units of device determines the initial state of charge of energy-storage system；
The Second Criterion is determined as the following formula:
In formula, PGIt (m) is the force data out of conventional power unit in photovoltaic plant in starting period i；PPVIt (m) is starting period i
Interior predicting power of photovoltaic plant data；N is the starting number of units of photovoltaic DC-to-AC converter；S0(i) initial for energy-storage system in starting period i
State of charge；SminAnd SmaxThe respectively minimum and maximum state of charge of energy-storage system；PESNFor the specified function of energy-storage system
Rate；ENFor energy-storage system rated capacity；Ts is predicting power of photovoltaic plant data sampling period, PstFor the subsidiary engine system of conventional power unit
System power；
The maximum investment light under the different initial state-of-charges of several groups of system constraints can be obtained meeting according to above formula
Inverter number is lied prostrate, the maximum input quantity of photovoltaic DC-to-AC converter and corresponding optimal initial is obtained from the result of the above several groups
State-of-charge.
S2.. compare the current state of charge S of energy-storage systemnow(i) with initial state of charge S0(i) value whether phase
Deng；
If Snow(i)≠S0(i), discharge condition is currently at for energy-storage system, then enabling energy-storage system is photovoltaic inversion
Device, which charges to, is currently up end cycle, enables i=i+1, and jump procedure S1；Charged state is currently at for energy-storage system
, then it enables the photovoltaic DC-to-AC converter pre-actuated charge to for energy-storage system and is currently up end cycle, enable i=i+1, and jump step
Rapid S1, the photovoltaic DC-to-AC converter quantity pre-actuated are determined within first starting period；
Until Snow(i)=S0(i), then the photovoltaic DC-to-AC converter for the maximum starting quantity that starting step S1 is determined, and restore electricity
Net operation.
The current charging and discharging state of the determining energy-storage system includes: the current value S by comparing energy-storage systemnow(i) and
Initial state-of-charge S0(i) value determines the current charging and discharging state of energy-storage system；
If Snow(i) > S0(i), the energy-storage system is currently at discharge condition；Otherwise, the energy-storage system is currently located
In charged state.
Further, it is determined that the photovoltaic DC-to-AC converter quantity pre-actuated, may include:
According to the minimum operation power allowances of energy storage system capacity and photovoltaic DC-to-AC converter, the photovoltaic for needing to pre-actuate is determined
The power output of inverter number and each inverter；
As the current value S of energy-storage systemnow(i) and initial state-of-charge S0(i) value is equal, determines that final photovoltaic is inverse
After becoming device starting quantity and energy-storage system incipient nucleus electricity condition, using photovoltaic plant station level AGC system, adjusts and to assign photovoltaic inverse
The power output instruction for becoming device, charges to energy-storage system.Collection electric line when in view of photovoltaic DC-to-AC converter starting, in photovoltaic plant
Impact can be generated to system with transformer starting charging, according to current collection line parameter circuit value, transformer capacity, pass through preparatory simulation calculation
Quantitative analysis is carried out to the charging impact of line and transformer, so that it is determined that the boot sequence of photovoltaic DC-to-AC converter, pre-actuates
Photovoltaic DC-to-AC converter is energy-storage system charging；
Then, the photovoltaic DC-to-AC converter of quantification, photovoltaic are inverse after the boot sequence starting determined according to above-mentioned steps adjusts
Become device work in maximal power tracing mode, the transmission line of electricity and transformer of photovoltaic plant to conventional power unit to be launched are filled
Electricity is powered for conventional power unit auxiliary system to be launched, and after auxiliary system completes starting, conventional power unit to be launched starts and with station-service
Electricity operation, accumulation energy type photovoltaic plant and conventional power unit paired running, the subsequent recovery for power grid.
Based on the accumulation energy type photovoltaic plant starting method of above-mentioned support power grid"black-start", based on the same inventive concept,
The embodiment of the invention also provides the accumulation energy type photovoltaic plant activation systems of support power grid"black-start", since the solution of these equipment is asked
The principle of topic is similar to the accumulation energy type photovoltaic plant starting method of support power grid"black-start", therefore overlaps will not be repeated, below
It is illustrated.
Fig. 3, which is shown in the embodiment of the present invention, supports the structure of the accumulation energy type photovoltaic plant activation system of power grid"black-start" to show
It is intended to, as shown in figure 3, the system may include:
The analysis of predicting power of photovoltaic plant data and evaluation module, for carrying out the power prediction data point of photovoltaic plant
Analysis, and photovoltaic plant continuous and effective power producing characteristics are assessed, when the continuous and effective of photovoltaic plant in the accumulation energy type photovoltaic plant goes out
When power meets the first criterion, black starting-up power supply of the photovoltaic plant as power system restoration is selected；
Energy-storage system starts judgment module, for being in the real-time voltage judgement system according to the accumulation energy type photovoltaic plant
No existing energy accumulation current converter starts successfully, so that it is determined that in the accumulation energy type photovoltaic plant energy-storage system starting strategy；
Photovoltaic plant starting capacity and timing computing module, for determining light in accumulation energy type photovoltaic plant according to Second Criterion
It lies prostrate the maximum starting quantity of inverter and the maximum of the photovoltaic DC-to-AC converter starts the corresponding energy-storage system of quantity initially charged shape
State value determines photovoltaic plant capacity, inverter distribution power and the boot sequence for needing to pre-actuate, and utilizes the photovoltaic of starting
Inverter restores operation of power networks.
Wherein, the corresponding energy storage of the maximum starting quantity of the maximum starting quantity of photovoltaic DC-to-AC converter and the photovoltaic DC-to-AC converter
The initial state of charge of system according to for according to the starting time of conventional power unit auxiliary system to be launched and startup power and
Climbing characteristic, stored energy capacitance and the limit value and current SOC of unit, photovoltaic power prediction data etc. determine；
Further, the predicting power of photovoltaic plant data analysis and evaluation module may include:
Analytical unit determines that the photovoltaic plant persistently has for analyzing as the following formula according to predicting power of photovoltaic plant data
Effect power output:
min{PPV(m)}
Assessment unit, for determining first criterion according to photovoltaic plant continuous and effective power output as the following formula:
min{PPV(m)}≥Pst
In formula, PpvIt (m) is the photovoltaic power prediction data since the power grid"black-start" moment in continuous time, m is from electricity
The net black starting-up moment starts the set of the composition of the photovoltaic power prediction data in continuous time, m=0, and 1,2 ... M, M are from electricity
The net black starting-up moment starts photovoltaic power prediction data number in continuous time；PstFor the auxiliary system power of conventional power unit；
Wherein, continuous time can be determined according to operating condition；Photovoltaic power prediction data can be by well known in the art pre-
Survey means obtain；
Further, the energy-storage system starts judgment module, may include:
Detection unit, for detecting the real-time voltage of the accumulation energy type photovoltaic plant；
Start unit, for starting the energy-storage system according to the real-time voltage of the accumulation energy type photovoltaic plant；
If detecting the real-time voltage, the energy-storage system is started using energy storage presynchronization starting strategy, if not examining
The real-time voltage is measured, then independently sagging control starts the energy-storage system using three-phase.
The photovoltaic plant starting capacity and timing computing module may include:
First computing unit, is used for:
Specifically, the maximum for meeting the photovoltaic DC-to-AC converter of the Second Criterion in starting period i is obtained according to Second Criterion
Start quantity and the initial state of charge of energy-storage system, wherein i takes positive integer, initial value 1；
Judging unit is used for:
Compare the current value S of energy-storage systemnow(i) and initial state-of-charge S0(i) whether value is equal；
First execution unit, is used for:
If Snow(i)≠S0(i), discharge condition is currently at for energy-storage system, then enabling energy-storage system is photovoltaic inversion
Device, which charges to, is currently up end cycle, enables i=i+1；Charged state is currently at for energy-storage system, then enables and pre-actuating
The photovoltaic DC-to-AC converter of quantity charges to for energy-storage system and is currently up end cycle, enables i=i+1；
Second computing unit, is used for:
According to the minimum operation power allowances of energy storage system capacity and photovoltaic DC-to-AC converter in the first starting period, determining is needed
It is preparatory
The photovoltaic DC-to-AC converter quantity of starting and the power output of each inverter；
Second execution unit, is used for:
If Snow(i)=S0(i), then the photovoltaic DC-to-AC converter maximum starting quantity obtained according to first computing unit opens
Dynamic photovoltaic DC-to-AC converter, and restore operation of power networks；.
Further, the Second Criterion determines as the following formula:
In formula, PGIt (m) is the force data out of conventional power unit in photovoltaic plant in starting period i；PPVIt (m) is starting period i
Interior predicting power of photovoltaic plant data；N is the starting number of units of photovoltaic DC-to-AC converter；S0(i) initial for energy-storage system in starting period i
State of charge；SminAnd SmaxThe respectively minimum and maximum state of charge of energy-storage system；PESNFor the specified function of energy-storage system
Rate；ENFor energy-storage system rated capacity；Ts is predicting power of photovoltaic plant data sampling period, PstFor the subsidiary engine system of conventional power unit
System power.
The controllability of photovoltaic plant, vulnerability to jamming can be improved by configuring energy-storage system in technical solution provided by the invention, makes
The photovoltaic plant that energy-storage system must be configured has black start-up ability, while the resume speed of regional power grid can be improved, and reduces and has a power failure
Loss, to realize the fast quick-recovery of regional power grid.
It should be understood by those skilled in the art that, embodiments herein can provide as method, system or computer program
Product.Therefore, complete hardware embodiment, complete software embodiment or reality combining software and hardware aspects can be used in the application
Apply the form of example.Moreover, it wherein includes the computer of computer usable program code that the application, which can be used in one or more,
The computer program implemented in usable storage medium (including but not limited to magnetic disk storage, CD-ROM, optical memory etc.) produces
The form of product.
The application is referring to method, the process of equipment (system) and computer program product according to the embodiment of the present application
Figure and/or block diagram describe.It should be understood that every one stream in flowchart and/or the block diagram can be realized by computer program instructions
The combination of process and/or box in journey and/or box and flowchart and/or the block diagram.It can provide these computer programs
Instruct the processor of general purpose computer, special purpose computer, Embedded Processor or other programmable data processing devices to produce
A raw machine, so that being generated by the instruction that computer or the processor of other programmable data processing devices execute for real
The device for the function of being specified in present one or more flows of the flowchart and/or one or more blocks of the block diagram.
These computer program instructions, which may also be stored in, is able to guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works, so that it includes referring to that instruction stored in the computer readable memory, which generates,
Enable the manufacture of device, the command device realize in one box of one or more flows of the flowchart and/or block diagram or
The function of being specified in multiple boxes.
These computer program instructions also can be loaded onto a computer or other programmable data processing device, so that counting
Series of operation steps are executed on calculation machine or other programmable devices to generate computer implemented processing, thus in computer or
The instruction executed on other programmable devices is provided for realizing in one or more flows of the flowchart and/or block diagram one
The step of function of being specified in a box or multiple boxes.
Technical solution of the present invention steadily restores operation of power networks using energy accumulation current converter and energy-storage system, is become by energy storage
Stream device realizes that the four-quadrant of power control is flexibly run, voltage and the frequency variation of support and responsive electricity grid, while can be smooth
Photovoltaic plant goes out fluctuation, improves the digestion capability of photovoltaic plant；It can by configure that energy-storage system can be improved photovoltaic plant
Control property, vulnerability to jamming, so that the photovoltaic plant of configuration energy-storage system has black start-up ability, to quickly restore regional power grid
Finally it should be noted that: the above embodiments are merely illustrative of the technical scheme of the present invention and are not intended to be limiting thereof, to the greatest extent
Invention is explained in detail referring to above-described embodiment for pipe, it should be understood by those ordinary skilled in the art that: still
It can be with modifications or equivalent substitutions are made to specific embodiments of the invention, and without departing from any of spirit and scope of the invention
Modification or equivalent replacement, should all cover within the scope of the claims of the present invention.
Claims (12)
1. a kind of accumulation energy type photovoltaic plant for supporting power grid"black-start" starts method, which is characterized in that the described method includes:
When grid collapses, when the continuous and effective power output of photovoltaic plant in the accumulation energy type photovoltaic plant meets the first criterion
When, select black starting-up power supply of the photovoltaic plant as power system restoration；
The starting plan of energy-storage system in the accumulation energy type photovoltaic plant is determined according to the real-time voltage of the accumulation energy type photovoltaic plant
Slightly, start energy-storage system；
The maximum starting quantity of photovoltaic DC-to-AC converter and the photovoltaic DC-to-AC converter in accumulation energy type photovoltaic plant are determined according to Second Criterion
The corresponding initial state of charge of energy-storage system of maximum starting quantity, and restore power grid using the photovoltaic DC-to-AC converter of starting and transport
Row.
2. the accumulation energy type photovoltaic plant of support power grid"black-start" starts method as described in claim 1, which is characterized in that described
First criterion, such as following formula:
min{PPV(m)}≥Pst
In formula, min { PPV(m) } it contributes for photovoltaic plant continuous and effective, PpvIt (m) is the continuous time since the power grid"black-start" moment
Interior photovoltaic power prediction data；PstFor the auxiliary system power of conventional power unit, m is the consecutive hours since the power grid"black-start" moment
The set of photovoltaic power prediction data composition in section.
3. the accumulation energy type photovoltaic plant of support power grid"black-start" starts method as described in claim 1, which is characterized in that described
The starting strategy of energy-storage system in the accumulation energy type photovoltaic plant is determined according to the real-time voltage of accumulation energy type photovoltaic plant, comprising:
The real-time voltage of the accumulation energy type photovoltaic plant is detected, if detecting the real-time voltage, is opened using energy storage presynchronization
Dynamic strategy starts the energy-storage system, if the real-time voltage is not detected, using described in three-phase independently sagging control starting
Energy-storage system.
4. the accumulation energy type photovoltaic plant of support power grid"black-start" starts method as described in claim 1, which is characterized in that described
Determine that the maximum starting quantity of photovoltaic DC-to-AC converter and the photovoltaic DC-to-AC converter are most in accumulation energy type photovoltaic plant according to Second Criterion
It is big to start the corresponding initial state of charge of energy-storage system of quantity, and restore operation of power networks, packet using the photovoltaic DC-to-AC converter of starting
It includes:
S1. the maximum starting for being currently up the photovoltaic DC-to-AC converter for meeting the Second Criterion in period i is obtained according to Second Criterion
Quantity and the initial state of charge of energy-storage system；
S2. compare the current state of charge S of energy-storage systemnow(i) with initial state of charge S0(i) whether value is equal；
If Snow(i)≠S0(i), discharge condition is currently at for energy-storage system, then enables energy-storage system fill for photovoltaic DC-to-AC converter
Electricity enables i=i+1, and jump procedure S1 to end cycle is currently up；Charged state is currently at for energy-storage system, then
It enables the photovoltaic DC-to-AC converter pre-actuated charge to for energy-storage system and is currently up end cycle, enable i=i+1, and jump procedure S1,
The photovoltaic DC-to-AC converter quantity pre-actuated is determined within first starting period；
Until Snow(i)=S0(i), then the photovoltaic DC-to-AC converter for the maximum starting quantity that starting step S1 is determined, and restore power grid fortune
Row.
5. the accumulation energy type photovoltaic plant of support power grid"black-start" as described in claim 1 or 4 starts method, which is characterized in that
The Second Criterion, such as following formula:
In formula, PGIt (m) is the force data out of conventional power unit in photovoltaic plant in starting period i；PPVIt (m) is light in starting period i
Overhead utility power prediction data；N is the starting number of units of photovoltaic DC-to-AC converter；S0(i) initially charged for energy-storage system in starting period i
State value；SminAnd SmaxThe respectively minimum and maximum state of charge of energy-storage system；PESNFor energy-storage system rated power；EN
For energy-storage system rated capacity；Ts is predicting power of photovoltaic plant data sampling period, PstFor the auxiliary system function of conventional power unit
Rate.
6. the accumulation energy type photovoltaic plant of support power grid"black-start" starts method as claimed in claim 4, which is characterized in that described
Energy-storage system is currently at discharge condition or the Rule of judgment of charged state includes:
If Snow(i) > S0(i), the energy-storage system is currently at discharge condition；Otherwise, the energy-storage system is currently at charging
State.
7. the accumulation energy type photovoltaic plant of support power grid"black-start" starts method as claimed in claim 4, which is characterized in that determine
The photovoltaic DC-to-AC converter quantity pre-actuated, comprising:
According to the minimum operation power allowances of energy storage system capacity and photovoltaic DC-to-AC converter, the photovoltaic inversion for needing to pre-actuate is determined
The power output of device quantity and each inverter.
8. a kind of accumulation energy type photovoltaic plant activation system for supporting power grid"black-start", the system comprises:
The analysis of predicting power of photovoltaic plant data and evaluation module, in the accumulation energy type photovoltaic plant photovoltaic plant hold
When continuous effective output meets the first criterion, black starting-up power supply of the photovoltaic plant as power system restoration is selected；
Energy-storage system starts judgment module, for determining the accumulation energy type light according to the real-time voltage of the accumulation energy type photovoltaic plant
The starting strategy of energy-storage system in overhead utility；
Photovoltaic plant starting capacity and timing computing module, for determining that photovoltaic is inverse in accumulation energy type photovoltaic plant according to Second Criterion
Become the corresponding initial state of charge of energy-storage system of maximum starting quantity of the maximum starting quantity and the photovoltaic DC-to-AC converter of device,
And restore operation of power networks using the photovoltaic DC-to-AC converter of starting.
9. the accumulation energy type photovoltaic plant activation system of support power grid"black-start" as claimed in claim 8, which is characterized in that described
The analysis of predicting power of photovoltaic plant data and evaluation module include:
Analytical unit, for determining that the photovoltaic plant continuous and effective is contributed according to the analysis of predicting power of photovoltaic plant data；
Assessment unit, for determining first criterion according to photovoltaic plant continuous and effective power output as the following formula:
min{PPV(m)}≥Pst
In formula, PpvIt (m) is the photovoltaic power prediction data since the power grid"black-start" moment in continuous time, m is from Power Grid Black
Startup time starts the set of the composition of the photovoltaic power prediction data in continuous time；PstFor the auxiliary system function of conventional power unit
Rate, m=0,1,2 ... M.
10. the accumulation energy type photovoltaic plant activation system of support power grid"black-start" as claimed in claim 8, which is characterized in that institute
Stating energy-storage system starting judgment module includes:
Detection unit, for detecting the real-time voltage of the accumulation energy type photovoltaic plant；
Start unit, for starting the energy-storage system according to the real-time voltage of the accumulation energy type photovoltaic plant；
If detecting the real-time voltage, the energy-storage system is started using energy storage presynchronization starting strategy, if being not detected
The real-time voltage, then using three-phase, independently sagging control starts the energy-storage system.
11. the accumulation energy type photovoltaic plant activation system of support power grid"black-start" as claimed in claim 8, which is characterized in that institute
It states photovoltaic plant starting capacity and timing computing module includes:
First computing unit, for obtaining the photovoltaic DC-to-AC converter for meeting the Second Criterion in starting period i according to Second Criterion
Maximum starting quantity and the initial state of charge of energy-storage system, wherein i takes positive integer, initial value 1；
Judging unit, for comparing the current value S of energy-storage systemnow(i) and initial state-of-charge S0(i) whether value is equal；
First execution unit, for working as Snow(i)≠S0(i), discharge condition is currently at for energy-storage system, then enables energy storage system
System charges to for photovoltaic DC-to-AC converter and is currently up end cycle, enables i=i+1；Charged state is currently at for energy-storage system,
It then enables the photovoltaic DC-to-AC converter for pre-actuating quantity charge to for energy-storage system and is currently up end cycle, enable i=i+1；
Second execution unit, for working as Snow(i)=S0(i), then according to first computing unit obtain photovoltaic DC-to-AC converter most
Big starting quantity starts photovoltaic DC-to-AC converter, and restores operation of power networks；
Second computing unit, for running function according to energy storage system capacity and the minimum of photovoltaic DC-to-AC converter in the first starting period
Rate limit determines the power output of the photovoltaic DC-to-AC converter quantity and each inverter that pre-actuate.
12. the accumulation energy type photovoltaic plant activation system of support power grid"black-start" as claimed in claim 11, which is characterized in that institute
Second Criterion is stated to determine as the following formula:
In formula, PGIt (m) is the force data out of conventional power unit in starting period i；PPVIt (m) is photovoltaic plant power in starting period i
Prediction data；N is the starting number of units of photovoltaic DC-to-AC converter；S0It (i) is the initial state of charge of energy-storage system in starting period i；Smin
And SmaxThe respectively minimum and maximum limit value of energy-storage system；PESNFor energy-storage system rated power；ENFor the specified appearance of energy-storage system
Amount；Ts is predicting power of photovoltaic plant data sampling period.
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| CN111817338A (en) * | 2020-05-29 | 2020-10-23 | 中国电力科学研究院有限公司 | Black start control method and system for wind-solar energy storage new energy power station |
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| CN111817338A (en) * | 2020-05-29 | 2020-10-23 | 中国电力科学研究院有限公司 | Black start control method and system for wind-solar energy storage new energy power station |
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