CN109494768A - Centralized photovoltaic plant and its control method, the control system for participating in power grid frequency modulation - Google Patents
Centralized photovoltaic plant and its control method, the control system for participating in power grid frequency modulation Download PDFInfo
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- CN109494768A CN109494768A CN201811560863.9A CN201811560863A CN109494768A CN 109494768 A CN109494768 A CN 109494768A CN 201811560863 A CN201811560863 A CN 201811560863A CN 109494768 A CN109494768 A CN 109494768A
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- 230000001360 synchronised effect Effects 0.000 claims description 17
- 238000010248 power generation Methods 0.000 claims description 10
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
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- H02J3/383—
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- 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 discloses centralized photovoltaic plant and its control method, the control system of participation power grid frequency modulation, method includes that (1) detects mains frequency, judges whether mains frequency is equal to rated frequency, if then terminating；If otherwise providing inertial response by the first energy-storage system；(2) judge whether mains frequency exceeds the frequency dead band of photovoltaic generation unit movement, if then being adjusted by photovoltaic generation unit according to the secondary frequencies that frequency situation of change participates in power grid one by one；If it is not, then return step (1)；(3) judge whether mains frequency exceeds the variation range for operating normally and allowing, if then providing the emergent control of frequency by the second energy-storage system active power of output；Return step (1) if not.The present invention can coordinate the real power control of multiple photovoltaic generation units in photovoltaic plant, and the frequency for allowing centralized photovoltaic plant to participate in electric system is adjusted, and be conducive to the safety and stabilization of power grid in the grid-connected situation of large-scale photovoltaic.
Description
Technical field
The present invention relates to generations of electricity by new energy and power grid control technology, more particularly to centralized photovoltaic plant and its participate in electricity
Control method, the control system of net frequency modulation.
Background technique
It is graduallyd mature as photovoltaic industry is rapidly developed with grid-connected control technology, builds centralized grid-connected photovoltaic power station
As the effective means for efficiently utilizing solar energy.Since the working environment of photovoltaic plant is special and occupied area is bigger,
Centralized photovoltaic plant is normally at more from far-off regions.Load type from far-off regions is single, and grid structure is weak, therefore when collection
When Chinese style photovoltaic electric station grid connection capacity expands, the randomness and fluctuation of photovoltaic output power will will increase electric system frequency modulation
Difficulty.On the other hand, due to centralized photovoltaic plant it is grid-connected will gradually original synchronous generator in substitution system, power train
It unites when the reduction of equivalent inertia will will lead to load variations and serious frequency fluctuation occurs, endanger the frequency stabilization in some areas
Property.Therefore, centralized photovoltaic plant frequency modulation control method is studied for improving new-energy grid-connected capacity and guaranteeing electric system peace
Full stable operation has important theory and application value.
Currently, there are two types of the main methods of photovoltaic power generation participation electric system frequency modulation.The first is installation energy-storage system, and
Guarantee photovoltaic power generation work under MPPT maximum power point tracking mode.But due to the limitation of energy storage system capacity and cost, only by
Energy-storage system, which undertakes frequency modulation task, will will increase system cost.Second is to transport photovoltaic in the range of photovoltaic maximum output
Row is in power dispatching mode.But influence of the power that photovoltaic plant can be dispatched in this case by intensity of illumination, it is likely that
There is the case where off-capacity.Since centralized photovoltaic plant is different from traditional distributed photovoltaic, internal existing energy-storage system
Also there is photovoltaic generation unit, and large number of.Therefore in order to guarantee that photovoltaic plant can effectively participate in power grid frequency modulation, it should
Sufficiently call the frequency regulation capacity of each generator unit.Centralized photovoltaic plant frequency modulation control method necessarily involves multiple power generations
Harmonic Control between unit.
Summary of the invention
Goal of the invention: the deficiency of power grid frequency modulation control method is participated in for existing photovoltaic plant, the invention proposes one kind
Centralized photovoltaic plant and its control method, the control system for participating in power grid frequency modulation, improve the frequency stability of electric system.
Technical solution: centralized photovoltaic plant participates in the control method of power grid frequency modulation, method includes the following steps:
(1) mains frequency is detected, judges whether mains frequency is equal to rated frequency, if so, terminating；If it is not, then by
One energy-storage system provides inertial response；
(2) judge whether mains frequency exceeds the frequency dead band of photovoltaic generation unit movement, if so, by photovoltaic power generation list
Member is adjusted according to the secondary frequencies that frequency situation of change participates in power grid one by one；If it is not, then return step (1)；
(3) judge whether mains frequency exceeds the variation range for operating normally and allowing, if so, defeated by the second energy-storage system
Active power out provides the emergent control of frequency；If it is not, return step (1).
Further, inertial response is provided by the first energy-storage system in step (1) specifically: first energy-storage system is adopted
With virtual synchronous generator control method, the dynamic response of conventional synchronization generator is simulated.
Further, photovoltaic generation unit successively uses the control method of off-load and frequency droop in step (2), each
The active power of photovoltaic generation unit output expresses formula are as follows:
Pref=(PMPPT-△P)-k(f-fd)PMPPT；
Wherein, PrefIndicate the active power reference value of photovoltaic generation unit；PMPPTIndicate that the maximum of photovoltaic generation unit is defeated
Power out；△ P indicates photovoltaic generation unit off-load power；The slope of k expression droop characteristic；The reality of f expression current electric grid
Border frequency；fdIndicate the operating frequency of photovoltaic DC-to-AC converter frequency response.
Further, the one of power grid is participated in one by one according to frequency situation of change by photovoltaic generation unit described in step (2)
Secondary frequencies are adjusted specifically: multiple photovoltaic generation units are by the cooperation of droop characteristic, according to " first putting into, retreat
Sequence out ", participates in frequency modulation in an orderly manner one by one.
Wherein, the slope k of droop characteristic are as follows:
Wherein, PmaxIndicate the peak power output of photovoltaic generation unit；PminIndicate the minimum output of photovoltaic generation unit
Power active power reference value；fd(i+1)And fdiRespectively indicate photovoltaic in # (i+1) photovoltaic generation unit and #i photovoltaic generation unit
The initiation culture of inverter frequency response；△ P indicates photovoltaic generation unit off-load power；PMPPTIndicate photovoltaic generation unit most
Big output power.
Further, the operating frequency of the latter photovoltaic generation unit is equal to previous photovoltaic generation unit in step (2)
Mains frequency when output power reaches maximum or minimum.
Further, the second energy-storage system uses virtual synchronous generator control method in the step (3).
In another embodiment, the control system of power grid frequency modulation control method, packet are participated in for above-mentioned centralized photovoltaic plant
Detection module and control module are included, detection module is exported signal to control module, control module for detecting mains frequency
For being analyzed and processed to the signal received, and issue photovoltaic generating system and the energy storage of control signal control photovoltaic plant
System makes corresponding actions.
In another embodiment, a kind of centralization photovoltaic plant, the centralization photovoltaic plant is furnished with above-mentioned control system.
Optionally, centralized photovoltaic plant includes photovoltaic generating system, collector system and energy-storage system, photovoltaic generating system
The electric energy of sending is generated electricity with energy-storage system and can be collected by collector system, using being connected to the grid after transformer T secondary booster；
Wherein photovoltaic generating system includes multiple photovoltaic generation units, and each photovoltaic generation unit includes two inverters；Collector system
Including multiple transformer sum aggregate electric lines；Energy-storage system includes the first energy-storage system and the second energy-storage system, wherein photovoltaic power generation
Unit and transformer correspond, and the electric energy that photovoltaic generation unit issues is after transformer boosts through collection electric line and energy storage system
System generates electricity and can collect, using being connected to the grid after transformer T secondary booster；Second energy-storage system is back-up system, in determination
Current electric grid frequency can just put into operation after having exceeded the variation range for operating normally and allowing.
The utility model has the advantages that compared with prior art, the present invention simulates the main process of conventional electric power system frequency modulation, make full use of
The frequency regulation capacity of energy-storage system and photovoltaic generation unit in photovoltaic plant has photovoltaic plant with conventional synchronization class generator seemingly
Fm capacity.In addition, the control method considers the sequence that each generator unit participated in/exited frequency modulation in detail, according to frequency
Rate situation of change determines to participate in the generator unit number of frequency modulation.Inverter is frequent in system when to effectively reduce frequency variation
Change equipment loss caused by itself working condition, also avoids that multiple generator units are irregular to be participated in/exit frequency modulation and cause
Frequency secondary pulse problem.
Detailed description of the invention
Fig. 1 is centralized photovoltaic electric station grid connection topological structure；
Fig. 2 is frequency modulation control method flow diagram；
Fig. 3 is the structural schematic diagram of energy storage inverter；
Fig. 4 is the structural schematic diagram of photovoltaic DC-to-AC converter；
Fig. 5 is the matching relationship schematic diagram of multiple photovoltaic DC-to-AC converter droop characteristics；
Fig. 6 is the active output curve diagram using energy-storage system after frequency modulation control method when frequency changes；
Fig. 7 is the active output curve diagram using photovoltaic generation unit after frequency modulation control method when frequency changes；
Fig. 8 is to respond comparing result using mains frequency before and after frequency modulation control method.
Specific embodiment
More detailed description is made to technical solution of the present invention in the following with reference to the drawings and specific embodiments.It should refer to
Out, it is exemplary by reference to the embodiment that attached drawing describes, be should not be understood as explaining only the invention to of the invention
Limitation.
In the present embodiment, centralized photovoltaic electric station grid connection topological structure is as shown in Figure 1, include photovoltaic generating system, current collection
System and energy-storage system, wherein photovoltaic generating system is by photovoltaic generation unit PV1-PV5Composition；Collector system includes transformer
T1-T5Sum aggregate electric line；Energy-storage system includes the first energy-storage system and the second energy-storage system, wherein the second energy-storage system is spare
System can just put into operation after determining that current electric grid frequency has exceeded the variation range for operating normally and allowing.Photovoltaic hair
The electric energy that electric system issues generates electricity and can collect with energy-storage system through collection electric line after transformer boosts, using transformer
It is connected to the grid after T secondary booster.
Related parameter setting is as follows in the present embodiment: centralized photovoltaic plant rated capacity is 5MW, wherein each photovoltaic is sent out
The capacity of electric unit is 1MW, and each photovoltaic generation unit is made of the inverter of two 500kW.Photovoltaic plant collector system
Voltage class is 35kV, is accessed in 110kV electric system by step-up transformer T.
Centralized photovoltaic plant participates in the control system of power grid frequency modulation, including detection module and control module, detection module
It exports for detecting mains frequency, and signal to control module, control module is for carrying out at analysis the signal received
Reason, and issue control signal control photovoltaic plant photovoltaic generating system and energy-storage system make corresponding actions.Collection shown in FIG. 1
After Chinese style photovoltaic plant is equipped with above-mentioned control system, the control method of participation power grid frequency modulation is referring to fig. 2, proposed by the invention
Centralized photovoltaic plant participates in the control method of power grid frequency modulation, comprising the following steps:
(1) mains frequency is detected, judges whether mains frequency is equal to rated frequency, if so, terminating；If it is not, then by light
The first energy-storage system inside overhead utility provides the inertial response of similar synchronous generator；
First energy-storage system use virtual synchronous generator control system as shown in figure 3, its by the active of top half
Ring and the idle ring of lower half portion are formed.Wherein active ring simulates inertia and damping characteristic possessed by synchronous generator,
Set active-power PrefP is exported with active powerVSGRespectively as the input torque T of virtual synchronous machine rotor after conversionref
With electromagnetic torque Te.According to synchronous generator rotor Secondary movement equation, the difference of input torque and electromagnetic torque is divided by inertial system
By integrating available virtual rotational speed omega for the first time after number JVSG, virtual rotational speed omegaVSGWith the specified angular frequency of power grid0Difference multiply
With automatic virtual blocks coefficient DpAfter feed back to input side for simulating synchronous machine rotor mechanical damping.Virtual rotational speed omegaVSGUsing one
Virtual built-in potential angle, θ is obtained after secondary integralVSG, virtual built-in potential angle, θVSGIt can be used as the phase reference signal of modulating wave.
Lower half portion is idle, and ring simulates a voltage adjustment characteristic of synchronous generator, QrefFor reactive power reference qref, QeFor reactive power
Output valve；Grid entry point voltage detecting value UpccWith voltage rating UnDifference multiplied by a pressure regulation coefficient DqAfter adjust reactive power reference
Value.The difference of reactive power reference qref and reactive power output valve adjusted adjusts after coefficient is the integral controller of 1/K
The amplitude of built-in potential E, the amplitude of built-in potential E can be used as the amplitude reference signal of modulating wave.By the amplitude and phase of modulating wave
Reference signal synthesizes three-phase modulations wave voltage signal eabc, reference value as inverter output voltage.
(2) judge whether mains frequency exceeds the frequency dead band of photovoltaic generation unit movement, if so, by photovoltaic power generation list
Member is adjusted according to the secondary frequencies that frequency situation of change participates in power grid one by one；If it is not, then return step (1)；
After mains frequency variation range has exceeded the frequency dead band of photovoltaic generation unit movement, photovoltaic generation unit root
It is adjusted according to the secondary frequencies that frequency situation of change participates in power grid one by one.In order to enable photovoltaic generation unit can change according to frequency
Situation changes the output of itself active power, with reference to the function frequency static characteristic of synchronous generator, to the photovoltaic in photovoltaic generation unit
The control method of inverter improves.Improved photovoltaic DC-to-AC converter control block diagram is as shown in figure 4, the active ginseng of photovoltaic DC-to-AC converter
Examining value can indicate are as follows:
Pref=(PMPPT-△P)-k(f-fd)PMPPT；
Wherein, PrefIndicate the active power reference value of photovoltaic generation unit；PMPPTIndicate that the maximum of photovoltaic generation unit is defeated
Power out；△ P indicates photovoltaic generation unit off-load power；The slope of k expression droop characteristic；The reality of f expression current electric grid
Border frequency；fdIndicate the operating frequency of inverter frequency response.
It is different since the droop characteristic of photovoltaic DC-to-AC converter can be adjusted flexibly according to practical frequency modulation demand
The sequence that each generator unit participates in frequency modulation can be coordinated by the cooperation of droop characteristic between photovoltaic DC-to-AC converter, thus
Photovoltaic DC-to-AC converter is avoided disorderly to participate in and exit frequency secondary pulse caused by frequency modulation.
In addition, droop characteristic makes full use of the fm capacity of each photovoltaic generation unit with merging, according to " first throwing
Enter, backed off after random " sequence, participate in frequency modulation in an orderly manner one by one, i.e., during frequency departure rated value, only when a upper photovoltaic
Generator unit could put into next photovoltaic generation unit after not having fm capacity；In frequency retrieval to rated value process
In, the priority that first photovoltaic generation unit of investment frequency modulation exits is lower.If successively putting into 1 to No. 5 photovoltaic generation unit, press
The sequence of 5 to No. 1 photovoltaic generation units successively exits, and the photovoltaic DC-to-AC converter for reducing participation frequency modulation to the greatest extent avoids frequent movement may
Bring negative effect.In summary the operation interval of two requirements, each photovoltaic generation unit should not handed over mutually indepedent, mutually
Fork, the matching relationship of multiple photovoltaic DC-to-AC converter droop characteristics are as shown in Figure 5.
From figure 5 it can be seen that each photovoltaic DC-to-AC converter can be orderly according to the situation of change of frequency participation frequency modulation, and
The initiation culture of the latter photovoltaic generation unit should be exactly equal to previous photovoltaic generation unit and reach maximum or least work
Frequency when the rate limit.For example, the initiation culture of #1 photovoltaic generation unit is fd1, with frequency reduction/increase its output work
Rate is stepped up/is reduced, when frequency changes to fd2When, #1 photovoltaic generation unit reaches maximum/minimum output power.#1 light at this time
The frequency regulation capacity of volt generator unit is utilized completely, frequency fd2It should be as the initiation culture of #2 photovoltaic generation unit.With such
It pushes away, the initiation culture f of # (i+1) photovoltaic generation unitd(i+1)It should be that #i photovoltaic generation unit output power reaches maximum/minimum
When corresponding mains frequency.The last one photovoltaic generation unit output power reaches power grid frequency corresponding when maximum/minimum
Rate should be equal to electric system and operate normally the frequency limits value allowed.Determine the operation interval of each photovoltaic generation unit
After, the oblique of droop characteristic can be determined according to the size of power variation and operation interval in photovoltaic frequency-modulating process
Rate k:
Wherein, PmaxIndicate the peak power output of photovoltaic generation unit；PminIndicate the minimum output of photovoltaic generation unit
Power active power reference value；fd(i+1)And fdiRespectively indicate photovoltaic in # (i+1) photovoltaic generation unit and #i photovoltaic generation unit
The initiation culture of inverter frequency response.
(3) judge whether mains frequency exceeds the variation range for operating normally and allowing, if so, inside by photovoltaic plant
Second energy-storage system active power of output, provides the emergent control of frequency；If it is not, return step (1).
After mains frequency has exceeded the variation range for operating normally and allowing, wattful power is exported by the second energy-storage system
Rate provides the emergent control of frequency.Virtual synchronous generator control system that second energy-storage system uses as shown in figure 3, this
Two energy-storage systems are spare energy storage control system, by logic judgment, are determining that current electric grid frequency exceeded normal fortune
It can just put into operation after the variation range that row allows.
Verifying uses the frequency response of the forward and backward system of frequency modulation control method in the system shown in figure 1.Under original state, it is
System stable operation, mains frequency are equal to 50Hz.Burden with power is uprushed 6MW when t=1s, and burden with power is cut off after continuing 6s.Frequency
During step disturbance, the active change curve of energy-storage system and photovoltaic generation unit is as shown in Figures 6 and 7, and Fig. 8 is using this hair
The frequency response comparing result of bright forward and backward system.Simulation result is observed it can be found that mains frequency is fast after burden with power of uprushing
The case where speed reduces, and each generator unit can change according to frequency orderly participates in frequency modulation control.Using virtual synchronous generator control
Put into operation at first provides inertial supports for system to the first energy-storage system (No. 1 energy storage) of method processed.It is in the dynamic case
Output power shows the inertia and oscillating characteristic of similar synchronous generator so that photovoltaic plant transient characterisitics can with it is same
It is comparable to walk generator.Then each photovoltaic generation unit can participate in primary frequency regulation of power network one by one, due to droop characteristic
Rationally setting, the time that a upper photovoltaic generation unit output power reaches maximum power point are exactly equal to next photovoltaic power generation
The time of unit participation frequency modulation.Since active vacancy is larger, in t=2s, mains frequency falls to 49.5Hz, all photovoltaic power generations
The frequency regulation capacity of unit has put into frequency modulation operation.As frequency continues to reduce, needing the second energy-storage system (No. 2 energy storage) is to be
System provides frequency urgent control.After the about 0.5s that is delayed, confirmation mains frequency is already below allowed band rather than transient state is shaken
Caused by swinging, operation is quickly accessed using the spare energy storage of virtual synchronous generator control, mains frequency is lifted to by 49.49Hz
49.53Hz.Since burden with power is cut off when t=7s, mains frequency is gradually recovered normally, each to send out during frequency retrieval
Electric unit can exit one by one in order, avoid while exiting the frequency secondary pulse that frequency modulation may cause.
Claims (10)
1. the control method that centralized photovoltaic plant participates in power grid frequency modulation, which is characterized in that method includes the following steps:
(1) mains frequency is detected, judges whether mains frequency is equal to rated frequency, if so, terminating；If it is not, then by the first storage
It can system offer inertial response；
(2) judge whether mains frequency exceeds the frequency dead band of photovoltaic generation unit movement, if so, by photovoltaic generation unit root
It is adjusted according to the secondary frequencies that frequency situation of change participates in power grid one by one；If it is not, then return step (1)；
(3) judge whether mains frequency exceeds the variation range for operating normally and allowing, if so, being had by the output of the second energy-storage system
Function power provides the emergent control of frequency；If it is not, return step (1).
2. the control method that centralization photovoltaic plant according to claim 1 participates in power grid frequency modulation, which is characterized in that step
(1) inertial response is provided by the first energy-storage system in specifically: first energy-storage system uses virtual synchronous generator control
Method simulates the dynamic response of conventional synchronization generator.
3. the control method that centralization photovoltaic plant according to claim 1 participates in power grid frequency modulation, which is characterized in that step
(2) photovoltaic generation unit successively uses the control method of off-load and frequency droop in, and the output of each photovoltaic generation unit has
Function power expression are as follows:
Pref=(PMPPT-△P)-k(f-fd)PMPPT；
Wherein, PrefIndicate the active power reference value of photovoltaic generation unit；PMPPTIndicate the maximum work output of photovoltaic generation unit
Rate；△ P indicates photovoltaic generation unit off-load power；The slope of k expression droop characteristic；The practical frequency of f expression current electric grid
Rate；fdIndicate the operating frequency of photovoltaic DC-to-AC converter frequency response.
4. the control method that centralization photovoltaic plant according to claim 1 participates in power grid frequency modulation, which is characterized in that step
(2) it is adjusted by photovoltaic generation unit according to the secondary frequencies that frequency situation of change participates in power grid one by one described in specifically: multiple
The photovoltaic generation unit is joined by the cooperation of droop characteristic according to the sequence of " first putting into, backed off after random " in an orderly manner one by one
With frequency modulation.
5. the control method that centralization photovoltaic plant according to claim 4 participates in power grid frequency modulation, which is characterized in that sagging
Characteristic slope k are as follows:
Wherein, PmaxIndicate the peak power output of photovoltaic generation unit；PminIndicate the minimum output power of photovoltaic generation unit
Active power reference value；fd(i+1)And fdiRespectively indicate photovoltaic inversion in # (i+1) photovoltaic generation unit and #i photovoltaic generation unit
The initiation culture of device frequency response；△ P indicates photovoltaic generation unit off-load power；PMPPTIndicate that the maximum of photovoltaic generation unit is defeated
Power out.
6. the control method that centralization photovoltaic plant according to claim 1 participates in power grid frequency modulation, which is characterized in that step
(2) operating frequency of the latter photovoltaic generation unit is equal to previous photovoltaic generation unit output power and reaches maximum or most in
The mains frequency of hour.
7. the control method that centralization photovoltaic plant according to claim 1 participates in power grid frequency modulation, which is characterized in that step
(3) the second energy-storage system uses virtual synchronous generator control method in.
8. the control system of power grid frequency modulation control method is participated in for any one of the claim 1-7 centralized photovoltaic plant,
It is characterized by comprising detection module and control module, detection module is exported signal to control for detecting mains frequency
Module, control module issue control signal and control centralized photovoltaic plant for being analyzed and processed to the signal received
Photovoltaic generating system and energy-storage system make corresponding actions.
9. a kind of centralization photovoltaic plant, which is characterized in that the centralization photovoltaic plant is equipped with control according to any one of claims 8 system
System.
10. a kind of centralized photovoltaic plant according to claim 9, it is characterised in that: centralized photovoltaic plant includes light
Photovoltaic generating system, collector system and energy-storage system, the electric energy that photovoltaic generating system issues is by collector system and energy-storage system institute
Power generation can collect, using being connected to the grid after transformer T secondary booster；Wherein photovoltaic generating system includes multiple photovoltaic power generation lists
Member, each photovoltaic generation unit include two inverters；Collector system includes multiple transformer sum aggregate electric lines；Energy-storage system packet
Include the first energy-storage system and the second energy-storage system, wherein photovoltaic generation unit and transformer correspond, photovoltaic generation unit hair
Electric energy out generates electricity and can collect with energy-storage system through collection electric line after transformer boosts, and rises using transformer T bis- times
It is connected to the grid after pressure；Second energy-storage system is back-up system, operates normally permission determining that current electric grid frequency has exceeded
It can just put into operation after variation range.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811560863.9A CN109494768A (en) | 2018-12-20 | 2018-12-20 | Centralized photovoltaic plant and its control method, the control system for participating in power grid frequency modulation |
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| CN201811560863.9A CN109494768A (en) | 2018-12-20 | 2018-12-20 | Centralized photovoltaic plant and its control method, the control system for participating in power grid frequency modulation |
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| CN113364030A (en) * | 2021-05-30 | 2021-09-07 | 国网福建省电力有限公司 | Passive off-line operation method for energy storage power station |
| CN114336678A (en) * | 2021-12-17 | 2022-04-12 | 中国长江三峡集团有限公司 | PMU-based wind and light storage station primary frequency modulation control method |
| CN116914781A (en) * | 2023-09-12 | 2023-10-20 | 中国三峡新能源(集团)股份有限公司辽宁分公司 | New energy rapid frequency response system and method |
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| CN114336678A (en) * | 2021-12-17 | 2022-04-12 | 中国长江三峡集团有限公司 | PMU-based wind and light storage station primary frequency modulation control method |
| CN114336678B (en) * | 2021-12-17 | 2023-10-13 | 中国长江三峡集团有限公司 | PMU-based primary frequency modulation control method for wind-solar energy storage station |
| CN116914781A (en) * | 2023-09-12 | 2023-10-20 | 中国三峡新能源(集团)股份有限公司辽宁分公司 | New energy rapid frequency response system and method |
| CN116914781B (en) * | 2023-09-12 | 2023-12-01 | 中国三峡新能源(集团)股份有限公司辽宁分公司 | New energy rapid frequency response system and method |
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