CN111668862B - Black start sequence control method for energy storage system - Google Patents
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
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- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The invention discloses a black start sequence control method for an energy storage system in a new energy occasion. And traversing all current transformers of the energy storage system before black start. When the state of charge (SOC) of a battery connected with at least 1 converter in the energy storage system is larger than a threshold value, executing a normal black start mode; and when the SOC of all the current transformers in the energy storage system is smaller than the threshold value, executing a low-power black start mode. The method selects the starting sequence of the converter preferentially, and simultaneously automatically starts the photovoltaic inverter and limits the power of the photovoltaic inverter in the black starting process to assist the energy storage system to establish stable voltage and frequency, so that the black starting success rate of the energy storage system is improved.
Description
Technical Field
The invention relates to the field of energy storage system control, in particular to a black start sequence control method for an energy storage system in a new energy occasion.
Background
In recent years, more and more off-grid new energy power generation systems are applied to remote mountainous areas, non-electric areas, islands and other occasions. However, because the photovoltaic and wind power output power has strong fluctuation and randomness, the instability of new energy power generation seriously restricts the application of the power. The energy storage technology can realize the functions of peak clipping and valley filling, frequency and voltage regulation, load fluctuation stabilization and the like, so that the energy storage technology becomes an effective support technology for improving the reliability of the off-grid new energy power generation system.
Compared with a large power grid, the stability of the off-grid new energy power station energy storage system is weak. On one hand, due to the fact that the capacity of the power grid is low and the supporting margin is insufficient, when an external power grid fails, power grid protection actions and power loss of the whole power grid often occur. On the other hand, when the illumination is insufficient or during night time, the energy storage system is required to supply power continuously, and unreasonable load distribution can lead to the shutdown of the energy storage system due to the emptying of the battery. At this time, the new energy power station energy storage system needs to be started up in a black mode.
The black start of the energy storage system in the new energy occasion refers to the process that the new energy power station energy storage system stops running in a whole station, when an external power grid loses power, the energy storage system finishes self-start and power supply recovery in the whole station, and power supply of the power grid is gradually recovered by matching with power grid dispatching. The process is generally divided into: the method comprises three stages of black start of an energy storage system, recovery of a photovoltaic/wind power system and load recovery. Under the remote operation and maintenance mode, the new energy storage power station is only provided with a small number of operation and maintenance personnel. Under the condition, the energy storage system is gradually started by adopting a traditional mode, manual checking and operation are needed one by one, time consumption is too long, and the total black time of the system and unnecessary consumption of the electric quantity of the battery are increased; when the battery power is too low, the conventional manual start method may cause the battery power to be exhausted during the black start process, which may cause the black start failure.
At present, a black start method for an energy storage system of a new energy power station is less researched. Chinese patent publication No. CN201710997335.9 discloses a method and system for starting an energy storage type photovoltaic power station that supports black start of a power grid. The method is based on the angle of power grid dispatching, optical power prediction is carried out on a plurality of photovoltaic energy storage power stations in a power grid, the photovoltaic energy storage power stations are preferentially selected to carry out black start, a specific start strategy is not given for a single photovoltaic energy storage power station, the condition of an off-grid photovoltaic energy storage power station and the special working condition that the battery electric quantity of an energy storage system is too low are not considered. Chinese patent publication No. 201910136494.9 discloses a factory microgrid black start system and method. The method simply selects the energy storage unit with high residual capacity to self-start, but does not consider the working condition that the battery electric quantity of the energy storage system is too low, and does not reasonably utilize the photovoltaic array in the black start process. Chinese patent publication No. 201710983900.6 discloses a dynamic programming model-based online decision method for black start recovery of distribution network islands. The method utilizes the diesel generator and the stored energy as a black start main power supply to establish stable voltage and frequency, and does not relate to a control method of an energy storage system during black start.
Disclosure of Invention
The technical problem to be solved by the invention is to overcome the defects in the prior art and provide a black start sequence control method for an energy storage system in a new energy occasion so as to solve the problem that the black start is easy to fail when the electric quantity of a battery is low.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a black start sequence control method for an energy storage system in a new energy occasion comprises the following steps:
1) collecting main circuit information of an energy storage system, wherein the main circuit information comprises energy storage system grid-connected point voltage, outgoing line switches and the positions of current collecting line switches;
2) collecting information of each energy storage converter and each photovoltaic inverter, wherein the information of each energy storage converter comprises a first starting permission signal, a battery emptying signal, a first operation signal, a battery charge state value correspondingly connected with the energy storage converter and a maximum charging power limit value; the information of the photovoltaic inverter comprises a second starting permission signal and a second running signal;
3) judging whether the energy storage system has a black start condition, if so, executing the step 4), and if not, terminating the sequence control;
4) sequencing the energy storage converters from large to small according to the state of charge values of the batteries connected correspondingly, and determining the serial number of the energy storage converter corresponding to the emptied battery and the serial number of the energy storage converter corresponding to the maximum state of charge value of the battery connected;
5) when each energy storage converter corresponds to the charge of the connected batteryMaximum value of state value is greater than SOC _low When the starting is finished, executing a black starting mode; when the maximum value of the state of charge values of the batteries connected corresponding to the energy storage converters is less than or equal to SOC _low When the power supply is started, executing a low-power black start mode; wherein, SOC _low Is a preset low battery black start mode threshold.
In the foregoing step 3), the black start condition of the energy storage system is as follows:
the voltage of the grid-connected point is less than a voltage rated value of 10%, the outgoing line switch is in a split position, the starting permission signal of at least one energy storage converter is 1, and the emptying signal is 0.
In the foregoing step 5), the strategy for executing the black start mode is:
starting an energy storage converter corresponding to the maximum state of charge value of a connected battery by a zero-power instruction;
after the energy storage converter in the first step is started, starting the rest energy storage converters except the energy storage converter with the maximum corresponding battery state of charge value and the energy storage converter with the emptied corresponding battery according to a zero-power instruction;
thirdly, closing an outlet switch;
fourthly, the switches of the current collecting circuits are closed, and the photovoltaic inverter is started;
and fifthly, starting the energy storage converter corresponding to the emptied battery according to the charging power instruction.
In the foregoing step 5), the strategy for executing the low battery black start mode is:
i) closing a current collection circuit switch;
II) starting an energy storage converter corresponding to the connected battery with the maximum state of charge value according to a zero power instruction;
III) when the energy storage converter in II) is started, starting any one photovoltaic inverter, and limiting the power of the photovoltaic inverter to P solar_max Charging the started energy storage converter; wherein the content of the first and second substances,
j represents the serial number of the energy storage converter, j is an integer, j is more than or equal to 1 and less than or equal to n, and n represents the number of the energy storage converterQuantity, n is an integer, n is not less than 2; k represents the serial number of the photovoltaic inverters, k is an integer, k is more than or equal to 1 and less than or equal to m, m represents the number of the photovoltaic inverters, m is an integer, and m is more than or equal to 2; p pcs_max (j) Maximum charging power limit, State, of an energy storage converter with sequence number j _pcs (j) Running signal, State, of energy-storing converter with sequence number j _inv (k) A starting command of the photovoltaic inverter with the sequence number k is represented;
IV) starting the other energy storage converters except the energy storage converter corresponding to the maximum state of charge value of the connected battery and the energy storage converter corresponding to the emptied battery in turn according to the sequence from the large state of charge value to the small state of charge value of the connected battery;
v) starting the remaining photovoltaic inverters and limiting the respective photovoltaic power to P solar_max Charging the started energy storage converter;
VI) closing the outgoing line switch;
and VII) starting the energy storage converter corresponding to the emptied battery according to the charging power instruction.
The invention has the following beneficial effects:
1. when the state of charge value of the battery of the energy storage system is normal, the energy storage system and the photovoltaic inverter can be started in a one-key sequence control mode;
2. when the battery charge state value of the energy storage system is low, the starting sequence of the energy storage converter can be selected preferentially, the photovoltaic inverter is started in a matched and interpenetrated mode, and the photovoltaic inverter is limited to operate at proper power, so that the black starting success rate of the energy storage system is improved.
The invention is suitable for the energy storage system of the off-grid new energy power station, is easy to realize and is stable and reliable in engineering application.
Drawings
Fig. 1 is a schematic structural diagram of an energy storage system of a new energy power station in an embodiment of the invention;
FIG. 2 is a flow chart of a black start sequence control method of an energy storage system according to the present invention;
fig. 3 is a flowchart of the normal black start mode and the low power black start mode according to the present invention, wherein (a) is the normal black start mode and (b) is the low power black start mode.
Detailed Description
The invention is further described below. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
The invention provides a black start sequence control method of an energy storage system. Fig. 1 is a schematic structural diagram of an energy storage system of a new energy power station, and the system includes n energy storage converters and m photovoltaic inverters. Wherein n is more than or equal to 2, and m is more than or equal to 2. The photovoltaic inverter and the energy storage converter are collected to a bus through respective collecting lines and are finally connected with an external power grid or load through an outgoing switch.
A coordination control device is arranged in the station and used for carrying out coordination control on the photovoltaic energy storage system. The device has the capability of information interaction with the energy storage converter and the photovoltaic inverter, and the information interaction comprises the following contents:
acquiring information of the energy storage converter, including a start permission signal Ready _pcs (j) Battery Empty signal Empty _pcs (j) Operation signal State _pcs (j) The energy storage converter corresponds to the state of charge value SOC of the connected battery _pcs (j) Maximum charging power limit P pcs_max (j)；
The instruction for sending the energy storage converter comprises a Start command Start _pcs (j)；
Acquiring information of the photovoltaic inverter including a start enable signal Ready _inv (k) Running signal State _inv (k)；
The instruction for issuing the photovoltaic inverter comprises a Start command Start _inv (k) Power limit P solar_max ；
J represents the serial number of the energy storage converter, j is an integer, and j is more than or equal to 1 and less than or equal to n; k represents the serial number of the photovoltaic inverter, k is an integer, and k is larger than or equal to 1 and smaller than or equal to m.
The black start sequence control method of the energy storage system is carried out according to the following steps:
1) the coordination control device acquires main circuit information of the energy storage system of the photovoltaic power station, including the voltage u of the grid-connected point of the energy storage system abc_pcc And outlet switch and each current collecting circuit switchLocation.
2) The coordination control device collects information of each energy storage converter and each photovoltaic inverter, wherein the information of the energy storage converters comprises a start permission signal Ready _pcs (j) Battery Empty signal Empty _pcs (j) Running signal State _pcs (j) Corresponding to the state of charge (SOC) of the connected battery _pcs (j) Maximum charging power limit P pcs_max (j) (ii) a The information of the photovoltaic inverter comprises a start permission signal Ready _inv (k) Running signal State _inv (k)。
3) The coordination control device judges whether the energy storage system has a black start condition, wherein the black start condition is as follows: u. of abc_pcc <10％U e The outgoing switch is in a position-division state, and at least one starting permission signal Ready of the energy storage converter _pcs Is 1, Empty _pcs Is 0. Wherein, U e Is the grid connection point voltage rating.
4) Coordinating and controlling black start to traverse battery state of charge (SOC) values connected with energy storage converters _pcs (j) And sorting according to the value from large to small, and determining that the battery is Empty (Empty) _pcs (j) 1) and the energy storage converter serial number j _ max with the maximum battery state of charge value, wherein SOC _pcs (j_max)＝max{SOC _pcs (1),...,SOC _pcs (n), j is more than or equal to 0 and less than or equal to n, and empty _ x represents the energy storage converter with the empty battery of the xth battery.
5) Coordination controller based on SOC _pcs (j _ max) selects the energy storage system start mode.
When SOC is reached _pcs (j_max)>SOC _low And executing a normal black start mode:
1) will P pcs_order (j) Setting the value to be 0, and starting the energy storage converter with the serial number of j _ max by a zero power instruction;
2) when the energy storage converter with the sequence number of j _ max is started, namely State _pcs (j _ max) is 1, the rest of Ready is started with a zero power command _pcs (j) Is 1 and Empty _pcs (j) An energy storage converter of 0;
3) closing an outlet switch;
4) closing the current collecting circuit switches to start Ready _inv (k) A photovoltaic inverter of 1;
5) will P pcs_order (empty _ x) is set to be a negative value, namely the energy storage converter with the serial number { empty _ x } is started according to the charging power instruction.
When SOC is reached _pcs (j_max)≤SOC _low And executing a low-power black start mode:
1) closing a current collection circuit switch;
2) will P pcs_order (j) Setting the value to be 0, namely starting the energy storage converter with the serial number of j _ max by a zero power instruction;
3) when the energy storage converter with the serial number of j _ max is started, namely State _pcs When (j _ max) is 1, starting any Ready _inv (k) Photovoltaic inverter of 1 and power limitation of P solar_max Charging the started energy storage converter, wherein,
4) sequentially starting the rest Ready according to the sequence of the SOC from large to small _pcs (j) Is 1 and Empty _pcs (j) An energy storage converter of 0;
5) start the rest of Ready _inv (k) A photovoltaic inverter of 1; and limit its power to P solar_max Charging the energy storage converter;
6) closing the outgoing line switch;
7) will P pcs_order (empty _ x) is set to be a negative value, namely the energy storage converter with the serial number { empty _ x } is started according to the charging power instruction.
Therein, SOC _low Is a preset low battery black start mode threshold.
It is to be noted that the above lists only specific embodiments of the present invention, and it is obvious that the present invention is not limited to the above embodiments, and many similar variations follow. All modifications which can be derived or suggested by the person skilled in the art from the present disclosure are intended to be within the scope of the present invention.
Claims (3)
1. A black start sequence control method for an energy storage system in a new energy occasion is characterized by comprising the following steps:
1) collecting main circuit information of an energy storage system, wherein the main circuit information comprises energy storage system grid-connected point voltage, outlet switches and the positions of current collection circuit switches;
2) collecting information of each energy storage converter and each photovoltaic inverter, wherein the information of each energy storage converter comprises a first starting permission signal, a battery emptying signal, a first operation signal, a battery charge state value and a maximum charging power limit value, wherein the battery charge state value and the maximum charging power limit value are correspondingly connected with the energy storage converters; the information of the photovoltaic inverter comprises a second starting permission signal and a second running signal;
3) judging whether the energy storage system has a black start condition, if so, executing the step 4), and if not, terminating the sequence control;
4) sequencing the energy storage converters from large to small according to the state of charge values of the batteries connected correspondingly, and determining the serial number of the energy storage converter corresponding to the emptied battery and the serial number of the energy storage converter corresponding to the maximum state of charge value of the battery connected;
5) when the maximum value of the state of charge values of the batteries correspondingly connected with the energy storage converters is larger than the SOC _low When the starting is finished, executing a black starting mode; when the maximum value of the state of charge values of the batteries correspondingly connected with the energy storage converters is less than or equal to the SOC _low When the power supply is started, executing a low-power black start mode; therein, SOC _low A preset low-battery black start mode threshold value;
the strategy for executing the black start mode is as follows:
starting an energy storage converter corresponding to the maximum state of charge value of a connected battery by a zero-power instruction;
after the energy storage converter in the first step is started, starting the rest energy storage converters except the energy storage converter corresponding to the maximum battery state-of-charge value and the energy storage converter corresponding to the emptied battery by using a zero-power instruction;
thirdly, closing the outgoing line switch;
fourthly, the switches of the current collecting circuits are closed, and the photovoltaic inverter is started;
and fifthly, starting the energy storage converter corresponding to the emptied battery according to the charging power instruction.
2. The method according to claim 1, wherein in step 3), the black start conditions of the energy storage system are as follows:
the voltage of the grid-connected point is less than a voltage rated value of 10%, the outgoing line switch is in a split position, the starting permission signal of at least one energy storage converter is 1, and the emptying signal is 0.
3. The method as claimed in claim 1, wherein the strategy for executing the low-battery black start mode in step 5) is:
i) closing a current collection circuit switch;
II) starting an energy storage converter corresponding to the connected battery with the maximum state of charge value according to a zero power instruction;
III) when the energy storage converter in II) is started, starting any one photovoltaic inverter, and limiting the power of the photovoltaic inverter to P solar_max Charging the started energy storage converter; wherein, the first and the second end of the pipe are connected with each other,
j represents the serial number of the energy storage converters, j is an integer, j is more than or equal to 1 and less than or equal to n, n represents the number of the energy storage converters, n is an integer, and n is more than or equal to 2; k represents the serial number of the photovoltaic inverters, k is an integer, k is more than or equal to 1 and less than or equal to m, m represents the number of the photovoltaic inverters, m is an integer, and m is more than or equal to 2; p is pcs_max (j) Maximum charging power limit, State, of an energy storage converter with sequence number j _pcs (j) Running signal, State, of energy-storing converter with sequence number j _inv (k) Representing a starting command of the photovoltaic inverter with the serial number k;
IV) starting the other energy storage converters except the energy storage converter with the maximum corresponding battery charge state value and the energy storage converter with the emptied corresponding battery in sequence according to the sequence from large to small corresponding to the connected battery charge state values;
v) starting the other photovoltaic inverters and limiting the respective photovoltaic power to P solar_max Charging the started energy storage converter;
VI) closing the outgoing line switch;
VII) starting the energy storage converter corresponding to the emptied battery according to the charging power instruction.
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| CN104993513A (en) * | 2015-06-30 | 2015-10-21 | 华北电力科学研究院有限责任公司 | Method and system for controlling battery energy storage power station of supporting black start of light-preserved power generation system |
| CN109698519A (en) * | 2017-10-24 | 2019-04-30 | 中国电力科学研究院有限公司 | A kind of accumulation energy type photovoltaic plant starting method and system supporting power grid"black-start" |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104993513A (en) * | 2015-06-30 | 2015-10-21 | 华北电力科学研究院有限责任公司 | Method and system for controlling battery energy storage power station of supporting black start of light-preserved power generation system |
| CN109698519A (en) * | 2017-10-24 | 2019-04-30 | 中国电力科学研究院有限公司 | A kind of accumulation energy type photovoltaic plant starting method and system supporting power grid"black-start" |
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