CN113595121A - Energy storage peak clipping and valley filling control method - Google Patents
Energy storage peak clipping and valley filling control method Download PDFInfo
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- CN113595121A CN113595121A CN202110928541.0A CN202110928541A CN113595121A CN 113595121 A CN113595121 A CN 113595121A CN 202110928541 A CN202110928541 A CN 202110928541A CN 113595121 A CN113595121 A CN 113595121A
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Abstract
The invention relates to an energy storage peak clipping and valley filling control method, which comprises the following steps: step 1: judging whether the current time is in the peak time period, if so, executing the step 2, otherwise, executing the step 3; step 2: judging the working state of the energy storage converter and whether the charging and discharging constraint conditions of the energy storage device are met, judging whether the energy storage system and the power grid are in counter flow, and increasing or reducing the discharging power of the energy storage inverter according to the judgment result; and step 3: and judging the working state of the energy storage converter, judging whether the working state of the energy storage converter meets the charging and discharging constraint conditions of the energy storage device and the working constraint conditions of the energy storage converter, and increasing or reducing the charging power of the energy storage inverter according to the judgment result. The invention can automatically operate to adjust the charge and discharge power of the energy storage system in real time, thereby controlling the energy storage system to realize peak clipping and valley filling and avoiding the problems of reverse flow and transformer overload.
Description
Technical Field
The invention belongs to the technical field of micro-grid control, and particularly relates to a control method suitable for an energy storage system connected with a power grid to realize peak clipping and valley filling.
Background
The micro-grid is used as an important support of 'internet +' smart energy and a technical means of friendly interaction with a large power grid, so that the safety and reliability of a power system can be improved, the access and local consumption of clean energy are promoted, the energy utilization efficiency is improved, an important role is played in energy conservation and emission reduction, and the construction of a conservation-oriented society is facilitated.
At present, deep level contradictions such as low comprehensive efficiency of a power system, insufficient coordination of links such as source network load and the like, insufficient complementation and mutual assistance of various power supplies and the like are increasingly prominent, comprehensive optimization is urgently needed, new technologies such as modern information communication technology, big data, artificial intelligence, energy storage and the like are needed to be relied on, the adjusting response capacity of the load side is fully mobilized, a comprehensive optimization configuration scheme of the source network, the load and the energy storage is researched, the fusion development with multi-energy complementary park and intelligent comprehensive energy demonstration is promoted, the self-balancing capacity is improved under the condition of economy and feasibility, and the peak regulation and capacity standby requirements of a large power grid are reduced.
Peak clipping and valley filling are the main operation mode and the profit way of the energy storage device in the existing microgrid. The peak clipping and valley filling means that the energy storage device is charged in the low valley period (when the electricity price is low) and discharged to be used by a user in the high peak period (when the electricity price is high), so that the peak valley electricity price arbitrage is realized while the power supply pressure of a power grid in the high peak period is relieved and the utilization rate of the power grid in the low valley period is improved. The peak-valley price difference of the big provinces of the power utilization of the whole country is distributed in 0.4-0.9 yuan/kWh, and a considerable space is provided for a user side to utilize the stored energy to benefit the peak-valley price difference.
However, the following problems may be encountered during the peak clipping and valley filling operation of the energy storage device in the microgrid:
(1) when the energy storage device is in peak clipping (discharging), if the total power consumption of a user is less than the discharging power of the energy storage device, the electric energy of the energy storage device can flow back to a superior power grid accessed by the user, so that the peak clipping income of the energy storage device is reduced;
(2) when the energy storage device is in valley filling (charging), if the charging power of the energy storage device is too high, the total power consumption of a user is too high, and overload operation or even tripping of a transformer of the user may be caused, so that the efficiency, the service life and the power consumption safety of the transformer are influenced.
Therefore, in the process of peak clipping and valley filling operation of the energy storage device, the charging and discharging power of the energy storage device needs to be adjusted according to the power consumption of a user, so that the situation that the electric energy of the energy storage device is reversely connected to the internet (countercurrent) or the overload operation (overload) of a user transformer is avoided.
Currently, the mainstream energy storage device in the market generally sets the charging and discharging power of the energy storage device at each time interval in advance to realize peak clipping and valley filling operation (for example, the energy storage device is set at 8: 00-12: 00 to discharge, the discharging power is 200kW, the energy storage device is set at 0: 00-8: 00 to charge, and the charging power is 100 kW), and an energy storage peak clipping and valley filling scheme for preventing backflow and transformer overload is not designed in a microgrid. In this mode, the energy storage device does not adjust the charge and discharge power in real time according to the power consumption of the user, so that the situation of reverse network access (reverse flow) of the electric energy of the energy storage device or overload operation (overload) of the user transformer is easy to occur.
Disclosure of Invention
The invention aims to provide an energy storage peak clipping and valley filling control method which can adjust the charging and discharging power of an energy storage system in real time and avoid the problems of reverse flow and transformer overload.
In order to achieve the purpose, the invention adopts the technical scheme that:
an energy storage peak clipping and valley filling control method is used for controlling an energy storage system connected with a power grid to realize peak clipping and valley filling, the energy storage system comprises an energy storage device, the energy storage device comprises an energy storage battery and an energy storage converter connected with the energy storage battery, and the energy storage peak clipping and valley filling control method comprises the following steps:
step 1: judging whether the current time is in the peak time period, if so, executing the step 2, otherwise, executing the step 3;
step 2: judging the working state of the energy storage converter and whether the charging and discharging constraint condition of the energy storage device is met, judging whether the energy storage system and the power grid are in counter flow, if the energy storage converter is in a shutdown state or a startup state and a discharging mode, the charging and discharging constraint condition of the energy storage device is met, and the energy storage converter is not in counter flow, the discharging power of the energy storage inverter is increased and then the step 1 is returned, if the energy storage converter is in a shutdown state and the charging and discharging constraint condition or the reverse flow of the energy storage device is not met, returning to the step 1, if the energy storage converter is in a starting state and a discharging mode and does not meet the charging and discharging constraint condition or the reverse flow of the energy storage device, if the energy storage converter is in a starting state and a charging mode, the energy storage converter is switched to a shutdown state and then returns to the step 1;
and step 3: judging the working state of the energy storage converter and whether the working state of the energy storage converter meets the charging and discharging constraint conditions of the energy storage device and the working constraint conditions of the energy storage converter, if the energy storage converter is in a starting state and a charging mode or a shutdown state, the charging and discharging constraint conditions of the energy storage device and the working constraint conditions of the energy storage converter are met, increasing the charging power of the energy storage inverter and returning to the step 1, if the energy storage converter is in the starting state and the charging mode and the charging and discharging constraint conditions of the energy storage device or the working constraint conditions of the energy storage converter are not met, reducing the charging power of the energy storage inverter and returning to the step 1, and if the energy storage converter is in the starting state and the discharging mode, switching the energy storage converter to the shutdown state and returning to the step 1.
In the step 1, if the peak time starting time is less than or equal to the current time and less than the peak time ending time, the current time is judged to be within the peak time period.
And (2) presetting a commercial power anti-reflux threshold, judging whether the energy storage system and the power grid are in a reflux state or not by using the detected commercial power and the commercial power anti-reflux threshold in the step (2), and judging that the energy storage system and the power grid are in the non-reflux state when the detected commercial power is larger than the commercial power anti-reflux threshold.
The charge and discharge constraint conditions of the energy storage device comprise: the charge state of the energy storage battery is greater than the discharge depth of the energy storage battery; the charge state of the energy storage battery is less than the charge depth of the energy storage battery; the discharge power of the energy storage converter is less than the maximum discharge power of the energy storage battery; the charging power of the energy storage converter is less than the maximum charging power of the energy storage battery; the working constraint conditions of the energy storage converter are as follows: the discharging power of the energy storage converter is less than the maximum discharging power of the energy storage battery, and the charging power of the energy storage converter is less than the maximum charging power of the energy storage battery.
In step 2, the method for increasing the discharge power of the energy storage inverter comprises the following steps: switching the energy storage converter in a shutdown state to a startup state and a discharge mode, determining the discharge power of the energy storage converter based on a set battery discharge power increase coefficient and the maximum discharge power of the energy storage battery, or determining a discharge power increase amount based on a set discharge power increase coefficient and the maximum discharge power of the energy storage battery, and obtaining the increased discharge power of the energy storage converter based on the current discharge power of the energy storage converter and the discharge power increase amount;
the method for reducing the discharge power of the energy storage converter comprises the following steps: determining a discharge power reduction amount based on a set battery discharge power increase coefficient and the maximum discharge power of the energy storage battery, and obtaining the reduced discharge power of the energy storage converter based on the current discharge power of the energy storage converter and the discharge power reduction amount, or switching the energy storage converter in a power-on state and a discharge mode to a power-off state.
The step 2 comprises the following steps:
step 2-1: judging whether the energy storage converter is in a shutdown state, if so, executing the step 2-2, and otherwise, executing the step 2-5;
step 2-2: judging whether the state of charge of the energy storage battery is greater than the discharge depth of the energy storage battery, if so, executing the step 2-3, otherwise, returning to the step 1;
step 2-3: judging whether the energy storage system and the power grid are in counter flow, if not, executing the step 2-4, and if so, returning to the step 1;
step 2-4: increasing the discharging power of the energy storage inverter, switching the energy storage converter in a shutdown state to a startup state and a discharging mode, determining the discharging power of the energy storage converter based on a set battery discharging power increase coefficient and the maximum discharging power of the energy storage battery, and then returning to the step 1;
step 2-5: judging whether the energy storage converter is in a starting state and a discharging mode, if so, executing the step 2-6, otherwise, executing the step 2-12;
step 2-6: judging whether the state of charge of the energy storage battery is larger than the discharge depth of the energy storage battery, if so, executing the step 2-7, otherwise, executing the step 2-11;
step 2-7: judging whether the energy storage system and the power grid are in counter flow, if not, executing the step 2-8, and if so, executing the step 2-10;
step 2-8: judging whether the discharge power of the energy storage converter is less than the maximum discharge power of the energy storage battery or not, if so, executing the step 2-9, otherwise, returning to the step 1;
step 2-9: increasing the discharging power of the energy storage inverter, determining the increasing amount of the discharging power based on a set discharging power increasing coefficient and the maximum discharging power of the energy storage battery, obtaining the increased discharging power of the energy storage converter based on the discharging power of the current energy storage converter and the increasing amount of the discharging power, and then returning to the step 1;
step 2-10: reducing the discharge power of the energy storage converter, determining the discharge power reduction amount based on a set battery discharge power increase coefficient and the maximum discharge power of the energy storage battery, obtaining the reduced discharge power of the energy storage converter based on the current discharge power of the energy storage converter and the discharge power reduction amount, and then returning to the step 1;
step 2-11: reducing the discharge power of the energy storage converter, switching the energy storage converter in a startup state and a discharge mode to a shutdown state, and then returning to the step 1;
step 2-12: and (3) returning to the step (1) after the energy storage converter is switched to a shutdown state.
The discharge power reduction amount is the product of the maximum discharge power of the energy storage battery and the battery discharge power increase coefficient, and the discharge power increase amount is the product of the maximum discharge power of the energy storage battery and the discharge power increase coefficient.
In the step 3, the method for increasing the charging power of the energy storage converter comprises the following steps: determining a charging power increment based on a set battery charging power increment coefficient and the maximum charging power of the energy storage battery, obtaining the increased charging power of the energy storage converter based on the current charging power of the energy storage converter and the charging power increment, or switching the energy storage converter in a shutdown state to a startup state and a charging mode, and determining the charging power of the energy storage converter based on the battery charging power increment coefficient and the maximum charging power of the energy storage battery;
the method for reducing the charging power of the energy storage converter comprises the following steps: determining a charging power reduction amount based on a set charging power increase coefficient and the maximum charging power of the energy storage battery, and obtaining the reduced charging power of the energy storage converter based on the current charging power of the energy storage converter and the charging power increase amount, or switching the energy storage converter in a power-on state and a charging mode to a power-off state.
The step 3 comprises the following steps:
step 3-1: judging whether the energy storage converter is in a starting state and a charging mode, if so, executing the step 3-2, and otherwise, executing the step 3-8;
step 3-2: judging whether the state of charge of the energy storage battery is smaller than the charging depth of the energy storage battery, if so, executing the step 3-3, and otherwise, executing the step 3-7;
step 3-3: judging whether the energy storage system and the power grid are in counter flow, if not, executing the step 3-4, and if so, executing the step 3-6;
step 3-4: judging whether the charging power of the energy storage converter is less than the maximum charging power of the energy storage battery or not, if so, executing the step 3-5, otherwise, returning to the step 1;
step 3-5: increasing the charging power of the energy storage converter, determining the charging power increase amount based on a set battery charging power increase coefficient and the maximum charging power of the energy storage battery, obtaining the increased charging power of the energy storage converter based on the current charging power of the energy storage converter and the charging power increase amount, and then returning to the step 1;
step 3-6: reducing the charging power of the energy storage converter, determining the reduction amount of the charging power based on a set charging power increase coefficient and the maximum charging power of the energy storage battery, obtaining the reduced charging power of the energy storage converter based on the current charging power of the energy storage converter and the charging power increase amount, and then returning to the step 1;
step 3-7: reducing the charging power of the energy storage converter, switching the energy storage converter in a starting state and a charging mode to a shutdown state, and then returning to the step 1;
step 3-8: judging whether the energy storage converter is in a shutdown state, if so, executing the step 3-9, and otherwise, executing the step 3-12;
step 3-9: judging whether the state of charge of the energy storage battery is smaller than the charging depth of the energy storage battery, if so, executing the step 3-10, and otherwise, returning to the step 1;
step 3-10: judging whether the energy storage system and the power grid are in counter flow, if not, executing the step 3-11, and if so, returning to the step 1;
step 3-11: increasing the charging power of the energy storage converter, switching the energy storage converter in a shutdown state to a startup state and a charging mode, determining the charging power of the energy storage converter based on the battery charging power increase coefficient and the maximum charging power of the energy storage battery, and then returning to the step 1;
step 3-12: and (3) returning to the step (1) after the energy storage converter is switched to a shutdown state.
The charging power increment is the product of the maximum charging power of the energy storage battery and the battery charging power increment coefficient, and the charging power decrement is the product of the maximum charging power of the energy storage battery and the charging power increment coefficient.
The values of the battery charging power increase coefficient and the battery discharging power increase coefficient are n%, and n is an integer which can be evenly divided by 100.
The value of n is 1, 2, 4, 5, 10, 20 or 50.
Due to the application of the technical scheme, compared with the prior art, the invention has the following advantages: the invention can automatically operate to adjust the charge and discharge power of the energy storage system in real time, thereby controlling the energy storage system to realize peak clipping and valley filling and avoiding the problems of reverse flow and transformer overload.
Drawings
Fig. 1 is a schematic diagram of a photovoltaic energy storage system.
Fig. 2 is a flow chart of the energy storage peak clipping and valley filling control method of the present invention.
Detailed Description
The invention will be further described with reference to examples of embodiments shown in the drawings to which the invention is attached.
The first embodiment is as follows: the energy storage system connected with the power grid comprises an energy storage device, and the energy storage device comprises an energy storage battery and an energy storage converter (PCS) connected with the energy storage battery. Fig. 1 shows a photovoltaic energy storage system connected to a power grid, which includes a photovoltaic device, a transformer, etc. in addition to an energy storage device, a commercial power of the power grid is connected to a 400V bus through the transformer, the photovoltaic device and the energy storage device are both connected to the 400V bus, the 400V bus can also be connected to a user's power consumption device, and a smart meter can be arranged between the power grid and the 400V bus to detect power. The photovoltaic device comprises a plurality of photovoltaic panels and a plurality of inverters connected with the photovoltaic panels in a one-to-one correspondence mode, and each inverter is connected to a 400V bus through one intelligent electric meter. The energy storage converter is also connected to a 400V bus through a smart meter. The energy storage converter has a power-on state and a power-off state, and can select a charging mode or a discharging mode.
Aiming at the energy storage system, the following energy storage peak clipping and valley filling control method is provided and is used for controlling the energy storage system connected with the power grid to realize peak clipping and valley filling.
In the method, the following parameters are mainly preset:
1. battery charging power increase coefficient: the battery charging power increase coefficient is used for expressing the percentage of increased power when the charging power of the energy storage battery in the energy storage system is adjusted;
2. battery discharge power increase coefficient: the battery discharge power increase coefficient is used for expressing the percentage of increased power when the discharge power of the energy storage battery in the energy storage system is adjusted;
3. commercial power anti-reflux threshold: and the mains supply power backflow prevention threshold is used for judging whether the photovoltaic energy storage system and the power grid are in backflow together with the detected mains supply power, when the detected mains supply power is larger than the mains supply power backflow prevention threshold, the situation that the photovoltaic energy storage system and the power grid are not in backflow is judged, and otherwise, the situation that the photovoltaic energy storage system and the power grid are not in backflow is judged.
The battery charging power increase coefficient and the battery discharging power increase coefficient are n%, where n is an integer divisible by 100, and n is, for example, 1, 2, 4, 5, 10, 20, or 50. In the same scheme, the battery charging power increase coefficient and the battery discharging power increase coefficient can be the same or different and are set as required. Generally, the commercial power anti-reflux threshold value is larger than the rated discharge power of the energy storage battery and the battery discharge power increase coefficient/100.
As shown in fig. 2, in the energy storage peak clipping and valley filling control method, an energy storage system includes an energy storage device, the energy storage device includes an energy storage battery and an energy storage converter connected to the energy storage battery, and the energy storage peak clipping and valley filling control method includes the following steps:
step 1: and (3) judging whether the current time is in the peak time period, if so, executing the step (2), and otherwise, executing the step (3).
In step 1, if the peak time starting time is less than or equal to the current time and less than the peak time ending time, it is determined that the current time is within the peak time period. Since the peak time period is often divided into several segments, it is necessary to perform determination for each segment. In this embodiment, taking the case that the peak time period is divided into two segments, the first segment of the peak time period lasts from the peak time start time 1 to the peak time end time 1, and the second segment of the peak time period lasts from the peak time start time 2 to the peak time end time 2, then the step 1 specifically includes the following steps:
step 1-1: judging whether the peak time starting time 1 is less than the current time and less than the peak time ending time 1, if so, the current time is in the peak time period, so the step 2 is executed, otherwise, the step 1-2 is executed;
step 1-2: and judging whether the peak time starting time 2 is less than or equal to the current time and less than the peak time ending time 2, if so, determining that the current time is in the peak time period, executing the step 2, and otherwise, executing the step 3.
Step 2: judging the working state of the energy storage converter and whether the charging and discharging constraint conditions of the energy storage device are met or not within the peak time period at the current time, judging whether the energy storage system and the power grid are in a reverse flow or not, if the energy storage converter is in a shutdown state or a startup state and a discharging mode, the charging and discharging constraint conditions of the energy storage device are met, and the reverse flow is not met, increasing the discharging power of the energy storage inverter, returning to the step 1, if the energy storage converter is in the shutdown state and the charging and discharging constraint conditions of the energy storage device are not met, returning to the step 1, if the energy storage converter is in the startup state and the discharging mode and the charging and discharging constraint conditions of the energy storage device are not met, reducing the discharging power of the energy storage inverter, returning to the step 1, and if the energy storage converter is in the startup state and the charging mode, switching the energy storage converter to the shutdown state, and returning to the step 1.
In step 2, the charge and discharge constraint conditions of the energy storage device include: the state of charge (SOC) of the energy storage battery is more than the discharge depth of the energy storage battery; the state of charge (SOC) of the energy storage battery is less than the charging depth of the energy storage battery; the discharge power of the energy storage converter is less than the maximum discharge power of the energy storage battery; the charging power of the energy storage converter is less than the maximum charging power of the energy storage battery. The charging state of the energy storage battery, the discharging depth of the energy storage battery and the discharging power of the energy storage converter, the maximum discharging power of the energy storage battery can be divided into the discharging constraint conditions of the energy storage device, and the charging state of the energy storage battery, the charging depth of the energy storage battery and the charging power of the energy storage converter, the maximum charging power of the energy storage battery are divided into the charging constraint conditions of the energy storage device.
In the step 2:
(1) the method for increasing the discharge power of the energy storage inverter comprises the following steps: the method comprises the steps of switching an energy storage converter in a shutdown state to a startup state and a discharge mode, determining the discharge power of the energy storage converter based on a set battery discharge power increase coefficient and the maximum discharge power of an energy storage battery, or determining a discharge power increase amount based on the set discharge power increase coefficient and the maximum discharge power of the energy storage battery, and obtaining the increased discharge power of the energy storage converter based on the discharge power and the discharge power increase amount of the current energy storage converter. The discharge power increase is the product of the maximum discharge power of the energy storage battery and the discharge power increase coefficient. For the scheme of switching the energy storage converter from the shutdown state to the startup state and the discharge mode, the discharge power increment is increased on the basis of the original discharge power 0, so that the discharge power of the energy storage converter is obtained;
(2) the method for reducing the discharge power of the energy storage converter comprises the following steps: and determining the discharge power reduction amount based on the set battery discharge power increase coefficient and the maximum discharge power of the energy storage battery, and obtaining the reduced discharge power of the energy storage converter based on the discharge power and the discharge power reduction amount of the current energy storage converter, or switching the energy storage converter in a startup state and a discharge mode to a shutdown state. The discharge power reduction is the product of the maximum discharge power of the energy storage battery and the discharge power increase coefficient of the battery. For the scheme of switching the energy storage converter from the power-on state and the discharge mode to the power-off state, the original discharge power is reduced to 0.
Based on this, step 2 specifically includes the following steps:
step 2-1: judging whether the energy storage converter is in a shutdown state, if so, executing the step 2-2, and otherwise, executing the step 2-5;
step 2-2: judging whether the state of charge of the energy storage battery is larger than the discharge depth of the energy storage battery, if so, executing the step 2-3, otherwise, returning to the step 1;
step 2-3: judging whether the detected mains supply power is larger than a mains supply power backflow prevention threshold value or not, namely judging whether the energy storage system and the power grid are in backflow or not, if so, executing the step 2-4, otherwise, returning to the step 1;
step 2-4: increasing the discharging power of the energy storage inverter, switching the energy storage converter in a shutdown state to a startup state and a discharging mode, determining the discharging power of the energy storage converter based on a set battery discharging power increase coefficient and the maximum discharging power of the energy storage battery, wherein the discharging power of the energy storage converter is the product of the maximum discharging power of the energy storage battery and the discharging power increase coefficient, namely, the discharging power increase is increased on the basis of the discharging power 0, and the discharging power increase is the product of the maximum discharging power of the energy storage battery and the discharging power increase coefficient, and then returning to the step 1;
step 2-5: judging whether the energy storage converter is in a starting state and a discharging mode, if so, executing the step 2-6, otherwise, executing the step 2-12;
step 2-6: judging whether the state of charge of the energy storage battery is larger than the discharging depth of the energy storage battery, if so, executing the step 2-7, otherwise, executing the step 2-11;
step 2-7: judging whether the detected mains supply power is larger than a mains supply power backflow prevention threshold value or not, namely judging whether the energy storage system and the power grid are in backflow or not, if so, executing the step 2-8, otherwise, executing the step 2-10;
step 2-8: judging whether the discharge power of the energy storage converter is smaller than the maximum discharge power of the energy storage battery, if so, executing the step 2-9, otherwise, returning to the step 1;
step 2-9: increasing the discharging power of the energy storage inverter, determining the discharging power increment based on the set discharging power increment coefficient and the maximum discharging power of the energy storage battery, wherein the discharging power increment is the product of the maximum discharging power of the energy storage battery and the discharging power increment coefficient, obtaining the discharging power of the increased energy storage converter based on the discharging power and the discharging power increment of the current energy storage converter, and the discharging power of the increased energy storage converter is the sum of the discharging power and the discharging power increment of the current energy storage converter, and then returning to the step 1;
step 2-10: reducing the discharge power of the energy storage converter, determining the discharge power reduction amount based on a set battery discharge power increase coefficient and the maximum discharge power of the energy storage battery, wherein the discharge power reduction amount is the product of the maximum discharge power of the energy storage battery and the battery discharge power increase coefficient, obtaining the reduced discharge power of the energy storage converter based on the discharge power and the discharge power reduction amount of the current energy storage converter, and the reduced discharge power of the energy storage converter is the difference between the discharge power and the discharge power reduction amount of the current energy storage converter and then returning to the step 1;
step 2-11: reducing the discharge power of the energy storage converter, switching the energy storage converter in a startup state and a discharge mode to a shutdown state, and then returning to the step 1;
step 2-12: and (4) returning to the step 1 after the energy storage converter is switched to a shutdown state.
And step 3: and if the energy storage converter is in the starting state and the charging mode and does not meet the charging and discharging constraint conditions of the energy storage device or the working constraint conditions of the energy storage converter, returning to the step 1 after the charging power of the energy storage inverter is increased, if the energy storage converter is in the starting state and the charging mode or the shutdown state and meets the charging and discharging constraint conditions of the energy storage device and the working constraint conditions of the energy storage converter, reducing the charging power of the energy storage inverter and returning to the step 1, and if the energy storage converter is in the starting state and the discharging mode, returning to the step 1 after the energy storage converter is switched to the shutdown state.
In step 3, the working constraint conditions of the energy storage converter are as follows: the discharging power of the energy storage converter is less than the maximum discharging power of the energy storage battery, and the charging power of the energy storage converter is less than the maximum charging power of the energy storage battery.
In this step 3:
(1) the method for increasing the charging power of the energy storage converter comprises the following steps: determining the increment of the charging power based on the set battery charging power increment coefficient and the maximum charging power of the energy storage battery, obtaining the increased charging power of the energy storage converter based on the charging power and the increment of the charging power of the current energy storage converter, or switching the energy storage converter in a shutdown state to a startup state and a charging mode, and determining the charging power of the energy storage converter based on the battery charging power increment coefficient and the maximum charging power of the energy storage battery. The charging power increment is the product of the maximum charging power of the energy storage battery and the battery charging power increase coefficient. For the scheme of switching the energy storage converter from the shutdown state to the startup state and the charging mode, the charging power increment is increased on the basis of the original charging power 0, so that the charging power of the energy storage converter is obtained;
(2) the method for reducing the charging power of the energy storage converter comprises the following steps: and determining the reduction amount of the charging power based on the set increase coefficient of the charging power and the maximum charging power of the energy storage battery, and obtaining the reduced charging power of the energy storage converter based on the charging power and the increase amount of the charging power of the current energy storage converter, or switching the energy storage converter in a startup state and a charging mode to a shutdown state. The charge power reduction is the product of the maximum charge power of the energy storage battery and the charge power increase coefficient. For the scheme of switching the energy storage converter from the power-on state and the charging mode to the power-off state, the original charging power is reduced to 0.
Based on this, step 3 specifically includes the following steps:
step 3-1: judging whether the energy storage converter is in a starting state and a charging mode, if so, executing the step 3-2, and otherwise, executing the step 3-8;
step 3-2: judging whether the charge state of the energy storage battery is smaller than the charge depth of the energy storage battery, if so, executing the step 3-3, and otherwise, executing the step 3-7;
step 3-3: judging whether the detected mains supply power is larger than a mains supply power backflow prevention threshold value or not, namely judging whether the energy storage system and the power grid are in backflow or not, if so, executing the step 3-4, otherwise, executing the step 3-6;
step 3-4: judging whether the charging power of the energy storage converter is less than the maximum charging power of the energy storage battery, if so, executing the step 3-5, otherwise, returning to the step 1;
step 3-5: increasing the charging power of the energy storage converter, determining the charging power increase amount based on a set battery charging power increase coefficient and the maximum charging power of the energy storage battery, wherein the charging power increase amount is the product of the maximum charging power of the energy storage battery and the battery charging power increase coefficient, obtaining the increased charging power of the energy storage converter based on the charging power and the charging power increase amount of the current energy storage converter, and returning to the step 1, wherein the increased charging power of the energy storage converter is the sum of the charging power and the charging power increase amount of the current energy storage converter;
step 3-6: reducing the charging power of the energy storage converter, determining the reduction amount of the charging power based on a set charging power increase coefficient and the maximum charging power of the energy storage battery, wherein the reduction amount of the charging power is the product of the maximum charging power of the energy storage battery and the charging power increase coefficient, obtaining the reduced charging power of the energy storage converter based on the charging power and the charging power increase amount of the current energy storage converter, and the reduced charging power of the energy storage converter is the difference between the charging power and the charging power increase amount of the current energy storage converter, and then returning to the step 1;
step 3-7: reducing the charging power of the energy storage converter, switching the energy storage converter in a starting state and a charging mode to a shutdown state, and then returning to the step 1;
step 3-8: judging whether the energy storage converter is in a shutdown state, if so, executing the step 3-9, and otherwise, executing the step 3-12;
step 3-9: judging whether the charge state of the energy storage battery is smaller than the charge depth of the energy storage battery, if so, executing the step 3-10, otherwise, returning to the step 1;
step 3-10: judging whether the detected mains supply power is larger than a mains supply power backflow prevention threshold value or not, namely judging whether the energy storage system and the power grid are in backflow or not, if so, executing the step 3-11, otherwise, returning to the step 1;
step 3-11: increasing the charging power of the energy storage converter, switching the energy storage converter in a shutdown state to a startup state and a charging mode, determining the charging power of the energy storage converter based on a battery charging power increase coefficient and the maximum charging power of the energy storage battery, wherein the charging power of the energy storage converter is the product of the maximum charging power of the energy storage battery and the battery charging power increase coefficient, namely, the charging power increase is increased on the basis of the charging power 0, and the charging power increase is the product of the maximum charging power of the energy storage battery and the battery charging power increase coefficient, and then returning to the step 1;
step 3-12: and (4) returning to the step 1 after the energy storage converter is switched to a shutdown state.
The scheme provides an energy storage peak clipping and valley filling method for preventing reverse flow and transformer overload for the micro-grid, and can avoid the occurrence of the situation that the electric energy of an energy storage device is reversely connected to the network (reverse flow) or the overload operation (overload) of a user transformer. It can be seen that the scheme comprises the following flows and steps:
1. collecting user power consumption period information, an energy storage device and rated parameters of a transformer;
2. recording the collected information in a strategy configuration table as a judgment condition of each flow when the scheme runs;
3. in the strategy configuration table, a battery charging power increase coefficient and a battery discharging power increase coefficient are input, which are key parameters for realizing the scheme, and specific values of the charging and discharging power of the energy storage device are regulated in the scene that the user power consumption is normal, the user power consumption is too low but the energy storage device is still discharging, and the user power consumption is too high but the energy storage device is still charging. Through the two parameters, the scheme realizes the charging and discharging power regulation without manual operation in the peak clipping and valley filling operation process of the energy storage device;
4. inputting a commercial power anti-reflux threshold value in a strategy configuration table, which is a key parameter for realizing the strategy and specifies when the strategy needs to adjust the charging and discharging power of the energy storage device and the direction of adjustment (increase or decrease);
5. the micro-grid operates according to the scheme, and the charging and discharging power of the energy storage device is adjusted according to the instruction output in the scheme.
Compared with the existing scheme, the scheme mainly improves the problem that the energy storage device cannot adjust the charge and discharge power in real time according to the power consumption of a user because the existing scheme does not design an energy storage peak clipping and valley filling strategy for preventing the reverse flow and the transformer overload in the micro-grid, so that the problem that the electric energy of the energy storage device is reversely connected to the network or the transformer of the user runs in an overload mode is easily caused. The scheme designs an energy storage peak clipping and valley filling strategy capable of preventing countercurrent and transformer overload, manual frequent operation is not needed, only strategy operation conditions are preset, the strategy can automatically operate, peak clipping and valley filling operation of an energy storage device in a micro-grid can not be influenced after the strategy operates, and meanwhile, reverse net surfing of the electric energy of the energy storage device or overload operation of a user transformer can be effectively avoided.
The above embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.
Claims (12)
1. An energy storage peak clipping and valley filling control method is used for controlling an energy storage system connected with a power grid to realize peak clipping and valley filling, the energy storage system comprises an energy storage device, the energy storage device comprises an energy storage battery and an energy storage converter connected with the energy storage battery, and the method is characterized in that: the energy storage peak clipping and valley filling control method comprises the following steps:
step 1: judging whether the current time is in the peak time period, if so, executing the step 2, otherwise, executing the step 3;
step 2: judging the working state of the energy storage converter and whether the charging and discharging constraint condition of the energy storage device is met, judging whether the energy storage system and the power grid are in counter flow, if the energy storage converter is in a shutdown state or a startup state and a discharging mode, the charging and discharging constraint condition of the energy storage device is met, and the energy storage converter is not in counter flow, the discharging power of the energy storage inverter is increased and then the step 1 is returned, if the energy storage converter is in a shutdown state and the charging and discharging constraint condition or the reverse flow of the energy storage device is not met, returning to the step 1, if the energy storage converter is in a starting state and a discharging mode and does not meet the charging and discharging constraint condition or the reverse flow of the energy storage device, if the energy storage converter is in a starting state and a charging mode, the energy storage converter is switched to a shutdown state and then returns to the step 1;
and step 3: judging the working state of the energy storage converter and whether the working state of the energy storage converter meets the charging and discharging constraint conditions of the energy storage device and the working constraint conditions of the energy storage converter, if the energy storage converter is in a starting state and a charging mode or a shutdown state, the charging and discharging constraint conditions of the energy storage device and the working constraint conditions of the energy storage converter are met, increasing the charging power of the energy storage inverter and returning to the step 1, if the energy storage converter is in the starting state and the charging mode and the charging and discharging constraint conditions of the energy storage device or the working constraint conditions of the energy storage converter are not met, reducing the charging power of the energy storage inverter and returning to the step 1, and if the energy storage converter is in the starting state and the discharging mode, switching the energy storage converter to the shutdown state and returning to the step 1.
2. An energy storage peak clipping and valley filling control method according to claim 1, characterized in that: in the step 1, if the peak time starting time is less than or equal to the current time and less than the peak time ending time, the current time is judged to be within the peak time period.
3. An energy storage peak clipping and valley filling control method according to claim 1, characterized in that: and (2) presetting a commercial power anti-reflux threshold, judging whether the energy storage system and the power grid are in a reflux state or not by using the detected commercial power and the commercial power anti-reflux threshold in the step (2), and judging that the energy storage system and the power grid are in the non-reflux state when the detected commercial power is larger than the commercial power anti-reflux threshold.
4. An energy storage peak clipping and valley filling control method according to claim 1, characterized in that: the charge and discharge constraint conditions of the energy storage device comprise: the charge state of the energy storage battery is greater than the discharge depth of the energy storage battery; the charge state of the energy storage battery is less than the charge depth of the energy storage battery; the discharge power of the energy storage converter is less than the maximum discharge power of the energy storage battery; the charging power of the energy storage converter is less than the maximum charging power of the energy storage battery; the working constraint conditions of the energy storage converter are as follows: the discharging power of the energy storage converter is less than the maximum discharging power of the energy storage battery, and the charging power of the energy storage converter is less than the maximum charging power of the energy storage battery.
5. An energy storage peak clipping and valley filling control method according to claim 4, characterized in that: in step 2, the method for increasing the discharge power of the energy storage inverter comprises the following steps: switching the energy storage converter in a shutdown state to a startup state and a discharge mode, determining the discharge power of the energy storage converter based on a set battery discharge power increase coefficient and the maximum discharge power of the energy storage battery, or determining a discharge power increase amount based on a set discharge power increase coefficient and the maximum discharge power of the energy storage battery, and obtaining the increased discharge power of the energy storage converter based on the current discharge power of the energy storage converter and the discharge power increase amount;
the method for reducing the discharge power of the energy storage converter comprises the following steps: determining a discharge power reduction amount based on a set battery discharge power increase coefficient and the maximum discharge power of the energy storage battery, and obtaining the reduced discharge power of the energy storage converter based on the current discharge power of the energy storage converter and the discharge power reduction amount, or switching the energy storage converter in a power-on state and a discharge mode to a power-off state.
6. An energy storage peak clipping and valley filling control method according to claim 5, characterized in that: the step 2 comprises the following steps:
step 2-1: judging whether the energy storage converter is in a shutdown state, if so, executing the step 2-2, and otherwise, executing the step 2-5;
step 2-2: judging whether the state of charge of the energy storage battery is greater than the discharge depth of the energy storage battery, if so, executing the step 2-3, otherwise, returning to the step 1;
step 2-3: judging whether the energy storage system and the power grid are in counter flow, if not, executing the step 2-4, and if so, returning to the step 1;
step 2-4: increasing the discharging power of the energy storage inverter, switching the energy storage converter in a shutdown state to a startup state and a discharging mode, determining the discharging power of the energy storage converter based on a set battery discharging power increase coefficient and the maximum discharging power of the energy storage battery, and then returning to the step 1;
step 2-5: judging whether the energy storage converter is in a starting state and a discharging mode, if so, executing the step 2-6, otherwise, executing the step 2-12;
step 2-6: judging whether the state of charge of the energy storage battery is larger than the discharge depth of the energy storage battery, if so, executing the step 2-7, otherwise, executing the step 2-11;
step 2-7: judging whether the energy storage system and the power grid are in counter flow, if not, executing the step 2-8, and if so, executing the step 2-10;
step 2-8: judging whether the discharge power of the energy storage converter is less than the maximum discharge power of the energy storage battery or not, if so, executing the step 2-9, otherwise, returning to the step 1;
step 2-9: increasing the discharging power of the energy storage inverter, determining the increasing amount of the discharging power based on a set discharging power increasing coefficient and the maximum discharging power of the energy storage battery, obtaining the increased discharging power of the energy storage converter based on the discharging power of the current energy storage converter and the increasing amount of the discharging power, and then returning to the step 1;
step 2-10: reducing the discharge power of the energy storage converter, determining the discharge power reduction amount based on a set battery discharge power increase coefficient and the maximum discharge power of the energy storage battery, obtaining the reduced discharge power of the energy storage converter based on the current discharge power of the energy storage converter and the discharge power reduction amount, and then returning to the step 1;
step 2-11: reducing the discharge power of the energy storage converter, switching the energy storage converter in a startup state and a discharge mode to a shutdown state, and then returning to the step 1;
step 2-12: and (3) returning to the step (1) after the energy storage converter is switched to a shutdown state.
7. An energy storage peak clipping and valley filling control method according to claim 6, characterized in that: the discharge power reduction amount is the product of the maximum discharge power of the energy storage battery and the battery discharge power increase coefficient, and the discharge power increase amount is the product of the maximum discharge power of the energy storage battery and the discharge power increase coefficient.
8. An energy storage peak clipping and valley filling control method according to claim 4, characterized in that: in the step 3, the method for increasing the charging power of the energy storage converter comprises the following steps: determining a charging power increment based on a set battery charging power increment coefficient and the maximum charging power of the energy storage battery, obtaining the increased charging power of the energy storage converter based on the current charging power of the energy storage converter and the charging power increment, or switching the energy storage converter in a shutdown state to a startup state and a charging mode, and determining the charging power of the energy storage converter based on the battery charging power increment coefficient and the maximum charging power of the energy storage battery;
the method for reducing the charging power of the energy storage converter comprises the following steps: determining a charging power reduction amount based on a set charging power increase coefficient and the maximum charging power of the energy storage battery, and obtaining the reduced charging power of the energy storage converter based on the current charging power of the energy storage converter and the charging power increase amount, or switching the energy storage converter in a power-on state and a charging mode to a power-off state.
9. An energy storage peak clipping and valley filling control method according to claim 8, characterized in that: the step 3 comprises the following steps:
step 3-1: judging whether the energy storage converter is in a starting state and a charging mode, if so, executing the step 3-2, and otherwise, executing the step 3-8;
step 3-2: judging whether the state of charge of the energy storage battery is smaller than the charging depth of the energy storage battery, if so, executing the step 3-3, and otherwise, executing the step 3-7;
step 3-3: judging whether the energy storage system and the power grid are in counter flow, if not, executing the step 3-4, and if so, executing the step 3-6;
step 3-4: judging whether the charging power of the energy storage converter is less than the maximum charging power of the energy storage battery or not, if so, executing the step 3-5, otherwise, returning to the step 1;
step 3-5: increasing the charging power of the energy storage converter, determining the charging power increase amount based on a set battery charging power increase coefficient and the maximum charging power of the energy storage battery, obtaining the increased charging power of the energy storage converter based on the current charging power of the energy storage converter and the charging power increase amount, and then returning to the step 1;
step 3-6: reducing the charging power of the energy storage converter, determining the reduction amount of the charging power based on a set charging power increase coefficient and the maximum charging power of the energy storage battery, obtaining the reduced charging power of the energy storage converter based on the current charging power of the energy storage converter and the charging power increase amount, and then returning to the step 1;
step 3-7: reducing the charging power of the energy storage converter, switching the energy storage converter in a starting state and a charging mode to a shutdown state, and then returning to the step 1;
step 3-8: judging whether the energy storage converter is in a shutdown state, if so, executing the step 3-9, and otherwise, executing the step 3-12;
step 3-9: judging whether the state of charge of the energy storage battery is smaller than the charging depth of the energy storage battery, if so, executing the step 3-10, and otherwise, returning to the step 1;
step 3-10: judging whether the energy storage system and the power grid are in counter flow, if not, executing the step 3-11, and if so, returning to the step 1;
step 3-11: increasing the charging power of the energy storage converter, switching the energy storage converter in a shutdown state to a startup state and a charging mode, determining the charging power of the energy storage converter based on the battery charging power increase coefficient and the maximum charging power of the energy storage battery, and then returning to the step 1;
step 3-12: and (3) returning to the step (1) after the energy storage converter is switched to a shutdown state.
10. An energy storage peak clipping and valley filling control method according to claim 9, characterized in that: the charging power increment is the product of the maximum charging power of the energy storage battery and the battery charging power increment coefficient, and the charging power decrement is the product of the maximum charging power of the energy storage battery and the charging power increment coefficient.
11. An energy storage peak clipping and valley filling control method according to any one of claims 5 to 10, characterized in that: the values of the battery charging power increase coefficient and the battery discharging power increase coefficient are n%, and n is an integer which can be evenly divided by 100.
12. An energy storage peak clipping and valley filling control method according to claim 11, characterized in that: the value of n is 1, 2, 4, 5, 10, 20 or 50.
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| CN116566020B (en) * | 2023-07-05 | 2023-09-12 | 深圳海辰储能控制技术有限公司 | Charging and discharging power control method and device of energy storage system |
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