CN115566709B - Energy storage converter single-machine energy on-site control method and device - Google Patents
Energy storage converter single-machine energy on-site control method and device Download PDFInfo
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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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Abstract
The invention relates to the technical field of energy storage control, and particularly provides a single-energy on-site control method and device for an energy storage converter, comprising the following steps: determining the charge and discharge state and the power stability of the energy storage converter based on the power of the energy storage converter; determining a state of charge interval of the energy storage battery based on the state of charge of the energy storage battery; and adjusting an active-frequency droop curve of the energy storage converter based on the charge state interval of the energy storage battery, the charge and discharge state of the energy storage converter and the power stability. According to the technical scheme provided by the invention, the problems that the energy management system of the independent power supply system fails, the balance power balance cannot be exerted after the energy storage battery is fully charged or discharged, and the service life of the battery is damaged can be avoided, and when the energy management system is unified and coordinated, the charging and discharging power is reasonably regulated by the converter according to the state of the converter, so that the charging and discharging power of the energy storage battery is reasonably controlled, and the battery is prevented from being discharged or fully charged.
Description
Technical Field
The invention relates to the technical field of energy storage control, in particular to a single-energy on-site control method and device for an energy storage converter.
Background
At present, in remote areas, because the power demand is small and the power supply is far away from a large power grid, the problem of power supply is solved by means of a remote power transmission technology, the construction cost is high, the operation and maintenance are difficult, the renewable energy sources such as solar energy, wind energy and water energy which are rich locally are utilized, and a renewable energy source power supply system is built according to local conditions to supply power to the local area, so that the problem can be effectively solved. The power supply problem in the non-electricity area can be solved by using a small independent photovoltaic power station or a wind-solar complementary power station. Through development, the technology of a common direct current bus type independent power supply system capable of supplying power to a remote area with tens to hundreds of kilowatts is quite mature.
Along with economic and social development, the required power supply capacity in remote areas often reaches megawatt level, and the renewable energy independent power supply system is converted into a common alternating current bus type power supply system. The renewable energy independent power supply system adopts an energy storage scheme to stabilize the power fluctuation of renewable energy, and because the running environment of the renewable energy independent power supply system is mostly a severe environment with severe cold at high altitude, the service life of an energy storage battery of the energy storage system is quicker, the state of charge (SOC) is quickly and easily lowered to be emptied when the energy storage battery discharges, the state of charge (SOC) is quickly raised to be fully charged when the energy storage battery charges, and the effect of balancing the power difference cannot be exerted after the battery is emptied or fully charged, so that the system is easy to collapse. And the renewable energy independent power supply system is influenced by severe cold severe environment at high altitude, the energy management system is easy to fail, the problem can not be solved due to the limitation of the capacity level of an operating personnel after the failure, and the maintenance personnel of a manufacturer with severe operating environment can not maintain the renewable energy independent power supply system timely, so that the energy storage system of the renewable energy independent power supply system fails, and the whole power supply system is crashed.
Therefore, in order to avoid the failure of the energy management system of the independent power supply system, the energy storage battery cannot exert the function of balancing the power difference after full charge or emptying and damage the service life of the battery, a single-energy on-site control method of the energy storage converter is needed.
Disclosure of Invention
In order to overcome the defects, the invention provides a single-energy on-site control method and device for an energy storage converter.
In a first aspect, a method for controlling energy of a single energy of an energy storage converter in situ is provided, where the method for controlling energy of the single energy of the energy storage converter in situ includes:
Determining the charge and discharge state and the power stability of the energy storage converter based on the power of the energy storage converter;
Determining a state of charge interval of the energy storage battery based on the state of charge of the energy storage battery;
and adjusting an active-frequency droop curve of the energy storage converter based on the charge state interval of the energy storage battery, the charge and discharge state of the energy storage converter and the power stability.
Preferably, determining the charge and discharge state of the energy storage converter based on the power of the energy storage converter includes:
When the power of the energy storage converter is positive in the current sampling period, the charging and discharging states of the energy storage converter are discharging states;
when the power of the energy storage converter is negative in the current sampling period, the charging and discharging states of the energy storage converter are charging states;
When the power of the energy storage converter is positive and negative in the current sampling period, the charging and discharging states of the energy storage converter are the same as those of the energy storage converter in the previous sampling period.
Preferably, determining the power stability of the energy storage converter based on the power of the energy storage converter comprises:
if the difference between the maximum value and the minimum value of the power of the energy storage converter in the current sampling period is smaller than the threshold value, the power of the energy storage converter is stable, otherwise, the power of the energy storage converter is unstable.
Preferably, the determining the state of charge interval of the energy storage battery based on the state of charge of the energy storage battery includes:
When the energy storage battery is in a discharging state and the state of charge is between 90 and 100, the state of charge interval of the energy storage battery is 1;
when the energy storage battery is in a discharging state and the state of charge is between 40 and 90, the state of charge interval of the energy storage battery is 2;
when the energy storage battery is in a discharging state and the state of charge is between 30 and 40, the state of charge interval of the energy storage battery is 3;
when the energy storage battery is in a discharging state and the state of charge is between 20 and 30, the state of charge interval of the energy storage battery is 4;
When the energy storage battery is in a discharging state and the state of charge is between 0 and 20, the state of charge interval of the energy storage battery is 5;
When the energy storage battery is in a charging state and the charging state is between 90 and 100, the charging state interval of the energy storage battery is-1;
when the energy storage battery is in a charging state and the charging state is between 80 and 90, the charging state interval of the energy storage battery is-2;
when the energy storage battery is in a charged state and the charged state is between 50 and 80, the charged state interval of the energy storage battery is-3;
when the energy storage battery is in a charging state and the charging state is between 30 and 50, the charging state interval of the energy storage battery is-4;
When the energy storage battery is in a charged state and the charged state is between 0 and 30, the charged state interval of the energy storage battery is-5.
Further, the adjusting the active-frequency sag curve of the energy storage converter based on the state of charge interval of the energy storage battery, the charge and discharge state of the energy storage converter, and the power stability includes:
When the state of charge interval of the energy storage battery in the current sampling period is between 1 and 5, and the state of charge interval of the energy storage battery in the previous sampling period is between 1 and 5 and is different from the state of charge interval of the energy storage battery in the current sampling period, and when the power of the energy storage converter is stable at the current sampling moment, the slope of the active-frequency sagging curve of the energy storage converter is adjusted to be: korig/k_scale (SOC_Reg_Last-2);
When the state of charge interval of the energy storage battery in the current sampling period is between 1 and 5, and the state of charge interval of the energy storage battery in the previous sampling period is the same as the state of charge interval of the energy storage battery in the current sampling period, and the power of the energy storage converter is stable in the current state of charge interval for a period of time, the slope of the active-frequency droop curve of the energy storage converter is adjusted to be: korig/k_scale (SOC_Reg_Last-2);
When the state of charge interval of the energy storage battery in the current sampling period is between 1 and 5, the state of charge interval of the energy storage battery in the previous sampling period is between-5 and-1, and the power of the energy storage converter is stable at the current sampling moment, the slope of the active-frequency droop curve of the energy storage converter is adjusted to be: korig/k_scale (-4-SOC_Reg_Last);
When the state of charge interval of the energy storage battery in the current sampling period is between-5 and-1, the state of charge interval of the energy storage battery in the previous sampling period is between-5 and-1 and is different from the state of charge interval of the energy storage battery in the current sampling period, and when the power of the energy storage converter is stable at the current sampling moment, the slope of the active-frequency droop curve of the energy storage converter is adjusted to be: korig/k_scale (-4-SOC_Reg_Last);
When the charge state interval of the energy storage battery in the current sampling period is between-5 and-1, and the charge state interval of the energy storage battery in the previous sampling period is the same as the charge state interval of the energy storage battery in the current sampling period, and the power of the energy storage converter is stable in the current charge state interval for a period of time, the slope of the active-frequency droop curve of the energy storage converter is adjusted to be: korig/k_scale (-4-SOC_Reg_Last);
when the charge state interval of the energy storage battery in the current sampling period is between-5 and-1, the charge state interval of the energy storage battery in the previous sampling period is between 1 and 5, and the power of the energy storage converter is stable at the current sampling moment, the slope of the active-frequency droop curve of the energy storage converter is adjusted to be: korig/k_scale (SOC_Reg_Last-2);
Wherein Korig is the slope of the initial active-frequency sag curve of the energy storage converter, k_scale is the slope adjustment coefficient of the active-frequency sag curve of the energy storage converter, k_scale >1, and soc_reg_last is the state of charge interval of the energy storage battery in the last sampling period.
Preferably, the method further comprises: and when the energy storage converter is abnormal in communication with the energy management system, executing the method.
In a second aspect, there is provided an energy storage converter single-machine energy in-situ control device, the energy storage converter single-machine energy in-situ control device comprising:
The first determining module is used for determining the charge and discharge states and the power stability of the energy storage converter based on the power of the energy storage converter;
the second determining module is used for determining a charge state interval of the energy storage battery based on the charge state of the energy storage battery;
And the adjusting module is used for adjusting an active-frequency droop curve of the energy storage converter based on the charge state interval of the energy storage battery, the charge and discharge state and the power stability of the energy storage converter.
Preferably, the first determining module is specifically configured to:
When the power of the energy storage converter is positive in the current sampling period, the charging and discharging states of the energy storage converter are discharging states;
when the power of the energy storage converter is negative in the current sampling period, the charging and discharging states of the energy storage converter are charging states;
When the power of the energy storage converter is positive and negative in the current sampling period, the charging and discharging states of the energy storage converter are the same as those of the energy storage converter in the previous sampling period.
Preferably, the first determining module is specifically configured to:
if the difference between the maximum value and the minimum value of the power of the energy storage converter in the current sampling period is smaller than the threshold value, the power of the energy storage converter is stable, otherwise, the power of the energy storage converter is unstable.
Preferably, the second determining module is specifically configured to:
When the energy storage battery is in a discharging state and the state of charge is between 90 and 100, the state of charge interval of the energy storage battery is 1;
when the energy storage battery is in a discharging state and the state of charge is between 40 and 90, the state of charge interval of the energy storage battery is 2;
when the energy storage battery is in a discharging state and the state of charge is between 30 and 40, the state of charge interval of the energy storage battery is 3;
when the energy storage battery is in a discharging state and the state of charge is between 20 and 30, the state of charge interval of the energy storage battery is 4;
When the energy storage battery is in a discharging state and the state of charge is between 0 and 20, the state of charge interval of the energy storage battery is 5;
When the energy storage battery is in a charging state and the charging state is between 90 and 100, the charging state interval of the energy storage battery is-1;
when the energy storage battery is in a charging state and the charging state is between 80 and 90, the charging state interval of the energy storage battery is-2;
when the energy storage battery is in a charged state and the charged state is between 50 and 80, the charged state interval of the energy storage battery is-3;
when the energy storage battery is in a charging state and the charging state is between 30 and 50, the charging state interval of the energy storage battery is-4;
When the energy storage battery is in a charged state and the charged state is between 0 and 30, the charged state interval of the energy storage battery is-5.
Further, the adjusting module is specifically configured to:
When the state of charge interval of the energy storage battery in the current sampling period is between 1 and 5, and the state of charge interval of the energy storage battery in the previous sampling period is between 1 and 5 and is different from the state of charge interval of the energy storage battery in the current sampling period, and when the power of the energy storage converter is stable at the current sampling moment, the slope of the active-frequency sagging curve of the energy storage converter is adjusted to be: korig/k_scale (SOC_Reg_Last-2);
When the state of charge interval of the energy storage battery in the current sampling period is between 1 and 5, and the state of charge interval of the energy storage battery in the previous sampling period is the same as the state of charge interval of the energy storage battery in the current sampling period, and the power of the energy storage converter is stable in the current state of charge interval for a period of time, the slope of the active-frequency droop curve of the energy storage converter is adjusted to be: korig/k_scale (SOC_Reg_Last-2);
When the state of charge interval of the energy storage battery in the current sampling period is between 1 and 5, the state of charge interval of the energy storage battery in the previous sampling period is between-5 and-1, and the power of the energy storage converter is stable at the current sampling moment, the slope of the active-frequency droop curve of the energy storage converter is adjusted to be: korig/k_scale (-4-SOC_Reg_Last);
When the state of charge interval of the energy storage battery in the current sampling period is between-5 and-1, the state of charge interval of the energy storage battery in the previous sampling period is between-5 and-1 and is different from the state of charge interval of the energy storage battery in the current sampling period, and when the power of the energy storage converter is stable at the current sampling moment, the slope of the active-frequency droop curve of the energy storage converter is adjusted to be: korig/k_scale (-4-SOC_Reg_Last);
When the charge state interval of the energy storage battery in the current sampling period is between-5 and-1, and the charge state interval of the energy storage battery in the previous sampling period is the same as the charge state interval of the energy storage battery in the current sampling period, and the power of the energy storage converter is stable in the current charge state interval for a period of time, the slope of the active-frequency droop curve of the energy storage converter is adjusted to be: korig/k_scale (-4-SOC_Reg_Last);
when the charge state interval of the energy storage battery in the current sampling period is between-5 and-1, the charge state interval of the energy storage battery in the previous sampling period is between 1 and 5, and the power of the energy storage converter is stable at the current sampling moment, the slope of the active-frequency droop curve of the energy storage converter is adjusted to be: korig/k_scale (SOC_Reg_Last-2);
Wherein Korig is the slope of the initial active-frequency sag curve of the energy storage converter, k_scale is the slope adjustment coefficient of the active-frequency sag curve of the energy storage converter, k_scale >1, and soc_reg_last is the state of charge interval of the energy storage battery in the last sampling period.
Preferably, the method comprises the steps of: and when the energy storage converter is abnormal in communication with the energy management system, starting the device.
In a third aspect, there is provided a computer device comprising: one or more processors;
The processor is used for storing one or more programs;
And when the one or more programs are executed by the one or more processors, the energy storage converter single-energy in-situ control method is realized.
In a fourth aspect, a computer readable storage medium is provided, on which a computer program is stored, said computer program, when executed, implementing the energy storage converter single-machine energy in-situ control method.
The technical scheme provided by the invention has at least one or more of the following beneficial effects:
The invention provides a single-energy on-site control method and device for an energy storage converter, comprising the following steps: determining the charge and discharge state and the power stability of the energy storage converter based on the power of the energy storage converter; determining a state of charge interval of the energy storage battery based on the state of charge of the energy storage battery; and adjusting an active-frequency droop curve of the energy storage converter based on the charge state interval of the energy storage battery, the charge and discharge state of the energy storage converter and the power stability. According to the technical scheme provided by the invention, the problems that the energy management system of the independent power supply system fails, the balance power balance cannot be exerted after the energy storage battery is fully charged or discharged, and the service life of the battery is damaged can be avoided, when the energy management system is unified and coordinated, the charging and discharging power is reasonably regulated by the converter according to the state of the converter, the charging and discharging power of the energy storage battery is reasonably controlled, the battery is prevented from being discharged or fully charged, and the stable operation of the system is maintained.
Drawings
Fig. 1 is a schematic flow chart of main steps of a single-energy in-situ control method of an energy storage converter according to an embodiment of the present invention;
Fig. 2 is a schematic diagram of an active-frequency sag curve of an energy storage converter according to an embodiment of the present invention;
FIG. 3 is a waveform diagram of a discharge state energy storage converter employing an energy in situ control regulation process in accordance with an embodiment of the present invention;
FIG. 4 is a diagram of a discharge state energy storage converter employing no energy in situ control waveforms in accordance with an embodiment of the present invention;
Fig. 5 is a waveform diagram of a state-of-charge energy storage converter employing energy in-situ control regulation process in accordance with an embodiment of the present invention;
Fig. 6 is a waveform diagram of an in-situ control of a state of charge energy storage converter without energy according to an embodiment of the present invention;
fig. 7 is a main structural block diagram of a single-energy in-situ control device of an energy storage converter according to an embodiment of the present invention.
Detailed Description
The following describes the embodiments of the present invention in further detail with reference to the drawings.
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
As disclosed in the background art, at present, remote areas are required to solve the power supply problem by means of remote power transmission technology due to small power requirements and long distance from a large power grid, the construction cost is high, the operation and maintenance are difficult, renewable energy sources such as solar energy, wind energy and water energy which are rich locally are utilized, and a renewable energy source power supply system is built according to local conditions to supply power to the local area, so that the problem can be effectively solved. The power supply problem in the non-electricity area can be solved by using a small independent photovoltaic power station or a wind-solar complementary power station. Through development, the technology of a common direct current bus type independent power supply system capable of supplying power to a remote area with tens to hundreds of kilowatts is quite mature.
Along with economic and social development, the required power supply capacity in remote areas often reaches megawatt level, and the renewable energy independent power supply system is converted into a common alternating current bus type power supply system. The renewable energy independent power supply system adopts an energy storage scheme to stabilize the power fluctuation of renewable energy, and because the running environment of the renewable energy independent power supply system is mostly a severe environment with severe cold at high altitude, the service life of an energy storage battery of the energy storage system is quicker, the state of charge (SOC) is quickly and easily lowered to be emptied when the energy storage battery discharges, the state of charge (SOC) is quickly raised to be fully charged when the energy storage battery charges, and the effect of balancing the power difference cannot be exerted after the battery is emptied or fully charged, so that the system is easy to collapse. And the renewable energy independent power supply system is influenced by severe cold severe environment at high altitude, the energy management system is easy to fail, the problem can not be solved due to the limitation of the capacity level of an operating personnel after the failure, and the maintenance personnel of a manufacturer with severe operating environment can not maintain the renewable energy independent power supply system timely, so that the energy storage system of the renewable energy independent power supply system fails, and the whole power supply system is crashed.
Therefore, in order to avoid the failure of the energy management system of the independent power supply system, the energy storage battery cannot exert the function of balancing the power difference after full charge or emptying and damage the service life of the battery, a single-energy on-site control method of the energy storage converter is needed.
In order to solve the above problems, the present invention provides a method and an apparatus for controlling a single energy of an energy storage converter in situ, comprising: determining the charge and discharge state and the power stability of the energy storage converter based on the power of the energy storage converter; determining a state of charge interval of the energy storage battery based on the state of charge of the energy storage battery; and adjusting an active-frequency droop curve of the energy storage converter based on the charge state interval of the energy storage battery, the charge and discharge state of the energy storage converter and the power stability. According to the technical scheme provided by the invention, the problems that the energy management system of the independent power supply system fails, the balance power balance cannot be exerted after the energy storage battery is fully charged or discharged, and the service life of the battery is damaged can be avoided, when the energy management system is unified and coordinated, the charging and discharging power is reasonably regulated by the converter according to the state of the converter, the charging and discharging power of the energy storage battery is reasonably controlled, the battery is prevented from being discharged or fully charged, and the stable operation of the system is maintained. The above-described scheme is explained in detail below.
Example 1
Referring to fig. 1, fig. 1 is a schematic flow chart of main steps of a single-energy in-situ control method of an energy storage converter according to an embodiment of the present invention. As shown in fig. 1, the method for controlling the energy of the energy storage converter in situ in a single machine mainly comprises the following steps:
step S101: determining the charge and discharge state and the power stability of the energy storage converter based on the power of the energy storage converter;
Step S102: determining a state of charge interval of the energy storage battery based on the state of charge of the energy storage battery;
step S103: and adjusting an active-frequency droop curve of the energy storage converter based on the charge state interval of the energy storage battery, the charge and discharge state of the energy storage converter and the power stability.
In this embodiment, determining the charge and discharge states of the energy storage converter based on the power of the energy storage converter includes:
When the power of the energy storage converter is positive in the current sampling period, the charging and discharging states of the energy storage converter are discharging states;
when the power of the energy storage converter is negative in the current sampling period, the charging and discharging states of the energy storage converter are charging states;
When the power of the energy storage converter is positive and negative in the current sampling period, the charging and discharging states of the energy storage converter are the same as those of the energy storage converter in the previous sampling period.
In this embodiment, determining the power stability of the energy storage converter based on the power of the energy storage converter includes:
if the difference between the maximum value and the minimum value of the power of the energy storage converter in the current sampling period is smaller than the threshold value, the power of the energy storage converter is stable, otherwise, the power of the energy storage converter is unstable.
In this embodiment, the determining the state of charge interval of the energy storage battery based on the state of charge of the energy storage battery includes:
When the energy storage battery is in a discharging state and the state of charge is between 90 and 100, the state of charge interval of the energy storage battery is 1;
when the energy storage battery is in a discharging state and the state of charge is between 40 and 90, the state of charge interval of the energy storage battery is 2;
when the energy storage battery is in a discharging state and the state of charge is between 30 and 40, the state of charge interval of the energy storage battery is 3;
when the energy storage battery is in a discharging state and the state of charge is between 20 and 30, the state of charge interval of the energy storage battery is 4;
When the energy storage battery is in a discharging state and the state of charge is between 0 and 20, the state of charge interval of the energy storage battery is 5;
When the energy storage battery is in a charging state and the charging state is between 90 and 100, the charging state interval of the energy storage battery is-1;
when the energy storage battery is in a charging state and the charging state is between 80 and 90, the charging state interval of the energy storage battery is-2;
when the energy storage battery is in a charged state and the charged state is between 50 and 80, the charged state interval of the energy storage battery is-3;
when the energy storage battery is in a charging state and the charging state is between 30 and 50, the charging state interval of the energy storage battery is-4;
When the energy storage battery is in a charged state and the charged state is between 0 and 30, the charged state interval of the energy storage battery is-5.
Specifically, the following table 1 shows:
TABLE 1
In one embodiment, the adjusting the active-frequency sag curve of the energy storage converter based on the state of charge interval of the energy storage battery, the charge-discharge state of the energy storage converter, and the power stability includes:
When the state of charge interval of the energy storage battery in the current sampling period is between 1 and 5, and the state of charge interval of the energy storage battery in the previous sampling period is between 1 and 5 and is different from the state of charge interval of the energy storage battery in the current sampling period, and when the power of the energy storage converter is stable at the current sampling moment, the slope of the active-frequency sagging curve of the energy storage converter is adjusted to be: korig/k_scale (SOC_Reg_Last-2);
When the state of charge interval of the energy storage battery in the current sampling period is between 1 and 5, and the state of charge interval of the energy storage battery in the previous sampling period is the same as the state of charge interval of the energy storage battery in the current sampling period, and the power of the energy storage converter is stable in the current state of charge interval for a period of time, the slope of the active-frequency droop curve of the energy storage converter is adjusted to be: korig/k_scale (SOC_Reg_Last-2);
When the state of charge interval of the energy storage battery in the current sampling period is between 1 and 5, the state of charge interval of the energy storage battery in the previous sampling period is between-5 and-1, and the power of the energy storage converter is stable at the current sampling moment, the slope of the active-frequency droop curve of the energy storage converter is adjusted to be: korig/k_scale (-4-SOC_Reg_Last);
When the state of charge interval of the energy storage battery in the current sampling period is between-5 and-1, the state of charge interval of the energy storage battery in the previous sampling period is between-5 and-1 and is different from the state of charge interval of the energy storage battery in the current sampling period, and when the power of the energy storage converter is stable at the current sampling moment, the slope of the active-frequency droop curve of the energy storage converter is adjusted to be: korig/k_scale (-4-SOC_Reg_Last);
When the charge state interval of the energy storage battery in the current sampling period is between-5 and-1, and the charge state interval of the energy storage battery in the previous sampling period is the same as the charge state interval of the energy storage battery in the current sampling period, and the power of the energy storage converter is stable in the current charge state interval for a period of time, the slope of the active-frequency droop curve of the energy storage converter is adjusted to be: korig/k_scale (-4-SOC_Reg_Last);
when the charge state interval of the energy storage battery in the current sampling period is between-5 and-1, the charge state interval of the energy storage battery in the previous sampling period is between 1 and 5, and the power of the energy storage converter is stable at the current sampling moment, the slope of the active-frequency droop curve of the energy storage converter is adjusted to be: korig/k_scale (SOC_Reg_Last-2);
Wherein Korig is the slope of the initial active-frequency sag curve of the energy storage converter, k_scale is the slope adjustment coefficient of the active-frequency sag curve of the energy storage converter, k_scale >1, and soc_reg_last is the state of charge interval of the energy storage battery in the last sampling period.
In a specific embodiment, the active-frequency sag curve of the energy storage converter is shown in fig. 2, where O point is (Pn, fn), pn is the rated power of the converter, and Fn is the rated frequency of the converter. Taking two converters as an example, the P-F curves of the two converters before adjustment are both curve 1, and the operating points of the two converters are both (P0, F0) points. If one of the converters is adjusted to be operated in curve 2 due to the change of the charge state of the energy storage battery, the operation points of the two adjusted converters are respectively (P1, F1) and (P2, F2), the system frequency is reduced from F0 to F1, the power of the converter of the P-F curve is reduced, the power of the converter of the unregulated curve is increased, and P1+P2=2P0 is satisfied.
In this embodiment, the method further includes: and when the energy storage converter is abnormal in communication with the energy management system, executing the method.
Specifically, the energy storage converter is in communication with the energy management system and is not started to control the energy in situ when the energy storage converter is in normal communication, and an instruction issued by the energy management system is executed. When the energy storage converter and the energy management system are abnormally in communication, the energy storage converter is put into on-site control, and the initial power, the initial SOC and the initial active-frequency (P-F) sagging curve of the energy storage converter at the time of the on-site control of the energy storage converter are required to be recorded, wherein the initial active-frequency (P-F) sagging curve comprises information such as an initial sagging curve slope, an initial sagging curve inflection point, an initial sagging curve origin point and the like.
In a specific embodiment, the simulation results show that the discharging state energy storage converter adopts an energy in-situ control and adjustment process waveform shown in fig. 3, the discharging state energy storage converter does not adopt an energy in-situ control waveform shown in fig. 4, the charging state energy storage converter adopts an energy in-situ control and adjustment process waveform shown in fig. 5, and the charging state energy storage converter does not adopt an energy in-situ control waveform shown in fig. 6.
Example 2
Based on the same inventive concept, the invention also provides an energy storage converter single-machine energy in-situ control device, as shown in fig. 7, comprising:
The first determining module is used for determining the charge and discharge states and the power stability of the energy storage converter based on the power of the energy storage converter;
the second determining module is used for determining a charge state interval of the energy storage battery based on the charge state of the energy storage battery;
And the adjusting module is used for adjusting an active-frequency droop curve of the energy storage converter based on the charge state interval of the energy storage battery, the charge and discharge state and the power stability of the energy storage converter.
Preferably, the first determining module is specifically configured to:
When the power of the energy storage converter is positive in the current sampling period, the charging and discharging states of the energy storage converter are discharging states;
when the power of the energy storage converter is negative in the current sampling period, the charging and discharging states of the energy storage converter are charging states;
When the power of the energy storage converter is positive and negative in the current sampling period, the charging and discharging states of the energy storage converter are the same as those of the energy storage converter in the previous sampling period.
Preferably, the first determining module is specifically configured to:
if the difference between the maximum value and the minimum value of the power of the energy storage converter in the current sampling period is smaller than the threshold value, the power of the energy storage converter is stable, otherwise, the power of the energy storage converter is unstable.
Preferably, the second determining module is specifically configured to:
When the energy storage battery is in a discharging state and the state of charge is between 90 and 100, the state of charge interval of the energy storage battery is 1;
when the energy storage battery is in a discharging state and the state of charge is between 40 and 90, the state of charge interval of the energy storage battery is 2;
when the energy storage battery is in a discharging state and the state of charge is between 30 and 40, the state of charge interval of the energy storage battery is 3;
when the energy storage battery is in a discharging state and the state of charge is between 20 and 30, the state of charge interval of the energy storage battery is 4;
When the energy storage battery is in a discharging state and the state of charge is between 0 and 20, the state of charge interval of the energy storage battery is 5;
When the energy storage battery is in a charging state and the charging state is between 90 and 100, the charging state interval of the energy storage battery is-1;
when the energy storage battery is in a charging state and the charging state is between 80 and 90, the charging state interval of the energy storage battery is-2;
when the energy storage battery is in a charged state and the charged state is between 50 and 80, the charged state interval of the energy storage battery is-3;
when the energy storage battery is in a charging state and the charging state is between 30 and 50, the charging state interval of the energy storage battery is-4;
When the energy storage battery is in a charged state and the charged state is between 0 and 30, the charged state interval of the energy storage battery is-5.
Further, the adjusting module is specifically configured to:
When the state of charge interval of the energy storage battery in the current sampling period is between 1 and 5, and the state of charge interval of the energy storage battery in the previous sampling period is between 1 and 5 and is different from the state of charge interval of the energy storage battery in the current sampling period, and when the power of the energy storage converter is stable at the current sampling moment, the slope of the active-frequency sagging curve of the energy storage converter is adjusted to be: korig/k_scale (SOC_Reg_Last-2);
When the state of charge interval of the energy storage battery in the current sampling period is between 1 and 5, and the state of charge interval of the energy storage battery in the previous sampling period is the same as the state of charge interval of the energy storage battery in the current sampling period, and the power of the energy storage converter is stable in the current state of charge interval for a period of time, the slope of the active-frequency droop curve of the energy storage converter is adjusted to be: korig/k_scale (SOC_Reg_Last-2);
When the state of charge interval of the energy storage battery in the current sampling period is between 1 and 5, the state of charge interval of the energy storage battery in the previous sampling period is between-5 and-1, and the power of the energy storage converter is stable at the current sampling moment, the slope of the active-frequency droop curve of the energy storage converter is adjusted to be: korig/k_scale (-4-SOC_Reg_Last);
When the state of charge interval of the energy storage battery in the current sampling period is between-5 and-1, the state of charge interval of the energy storage battery in the previous sampling period is between-5 and-1 and is different from the state of charge interval of the energy storage battery in the current sampling period, and when the power of the energy storage converter is stable at the current sampling moment, the slope of the active-frequency droop curve of the energy storage converter is adjusted to be: korig/k_scale (-4-SOC_Reg_Last);
When the charge state interval of the energy storage battery in the current sampling period is between-5 and-1, and the charge state interval of the energy storage battery in the previous sampling period is the same as the charge state interval of the energy storage battery in the current sampling period, and the power of the energy storage converter is stable in the current charge state interval for a period of time, the slope of the active-frequency droop curve of the energy storage converter is adjusted to be: korig/k_scale (-4-SOC_Reg_Last);
when the charge state interval of the energy storage battery in the current sampling period is between-5 and-1, the charge state interval of the energy storage battery in the previous sampling period is between 1 and 5, and the power of the energy storage converter is stable at the current sampling moment, the slope of the active-frequency droop curve of the energy storage converter is adjusted to be: korig/k_scale (SOC_Reg_Last-2);
Wherein Korig is the slope of the initial active-frequency sag curve of the energy storage converter, k_scale is the slope adjustment coefficient of the active-frequency sag curve of the energy storage converter, k_scale >1, and soc_reg_last is the state of charge interval of the energy storage battery in the last sampling period.
Preferably, the method comprises the steps of: and when the energy storage converter is abnormal in communication with the energy management system, starting the device.
Example 3
Based on the same inventive concept, the invention also provides a computer device comprising a processor and a memory for storing a computer program comprising program instructions, the processor for executing the program instructions stored by the computer storage medium. The processor may be a central processing unit (Central Processing Unit, CPU), other general purpose processor, digital signal processor (DIGITAL SIGNAL Processor, DSP), application specific integrated circuit (Application SpecificIntegrated Circuit, ASIC), off-the-shelf Programmable gate array (Field-Programmable GATEARRAY, FPGA) or other Programmable logic device, discrete gate or transistor logic device, discrete hardware components, etc., which are the computational core and control core of the terminal adapted to implement one or more instructions, particularly adapted to load and execute one or more instructions within a computer storage medium to implement the corresponding method flow or corresponding functions, to implement the steps of a single energy in situ control method of an energy storage converter in the above embodiments.
Example 4
Based on the same inventive concept, the present invention also provides a storage medium, in particular, a computer readable storage medium (Memory), which is a Memory device in a computer device, for storing programs and data. It is understood that the computer readable storage medium herein may include both built-in storage media in a computer device and extended storage media supported by the computer device. The computer-readable storage medium provides a storage space storing an operating system of the terminal. Also stored in the memory space are one or more instructions, which may be one or more computer programs (including program code), adapted to be loaded and executed by the processor. The computer readable storage medium herein may be a high-speed RAM memory or a non-volatile memory (non-volatile memory), such as at least one magnetic disk memory. One or more instructions stored in a computer-readable storage medium may be loaded and executed by a processor to implement the steps of a single energy in situ control method for an energy storage converter in the above embodiments.
It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Finally, it should be noted that: the above embodiments are only for illustrating the technical aspects of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the above embodiments, it should be understood by those of ordinary skill in the art that: modifications and equivalents may be made to the specific embodiments of the invention without departing from the spirit and scope of the invention, which is intended to be covered by the claims.
Claims (10)
1. An energy storage converter single-machine energy in-situ control method, which is characterized by comprising the following steps:
Determining the charge and discharge state and the power stability of the energy storage converter based on the power of the energy storage converter;
Determining a state of charge interval of the energy storage battery based on the state of charge of the energy storage battery;
Adjusting an active-frequency droop curve of the energy storage converter based on a state-of-charge interval of the energy storage battery, a charge-discharge state and power stability of the energy storage converter;
The determining the state of charge interval of the energy storage battery based on the state of charge of the energy storage battery comprises the following steps:
When the energy storage battery is in a discharging state and the state of charge is between 90 and 100, the state of charge interval of the energy storage battery is 1;
when the energy storage battery is in a discharging state and the state of charge is between 40 and 90, the state of charge interval of the energy storage battery is 2;
when the energy storage battery is in a discharging state and the state of charge is between 30 and 40, the state of charge interval of the energy storage battery is 3;
when the energy storage battery is in a discharging state and the state of charge is between 20 and 30, the state of charge interval of the energy storage battery is 4;
When the energy storage battery is in a discharging state and the state of charge is between 0 and 20, the state of charge interval of the energy storage battery is 5;
When the energy storage battery is in a charging state and the charging state is between 90 and 100, the charging state interval of the energy storage battery is-1;
when the energy storage battery is in a charging state and the charging state is between 80 and 90, the charging state interval of the energy storage battery is-2;
when the energy storage battery is in a charged state and the charged state is between 50 and 80, the charged state interval of the energy storage battery is-3;
when the energy storage battery is in a charging state and the charging state is between 30 and 50, the charging state interval of the energy storage battery is-4;
when the energy storage battery is in a charging state and the charging state is between 0 and 30, the charging state interval of the energy storage battery is-5;
the adjusting the active-frequency sag curve of the energy storage converter based on the state of charge interval of the energy storage battery, the charge and discharge state of the energy storage converter and the power stability comprises the following steps:
When the state of charge interval of the energy storage battery in the current sampling period is between 1 and 5, and the state of charge interval of the energy storage battery in the previous sampling period is between 1 and 5 and is different from the state of charge interval of the energy storage battery in the current sampling period, and when the power of the energy storage converter is stable at the current sampling moment, the slope of the active-frequency sagging curve of the energy storage converter is adjusted to be: korig/k_scale (SOC_Reg_Last-2);
When the state of charge interval of the energy storage battery in the current sampling period is between 1 and 5, and the state of charge interval of the energy storage battery in the previous sampling period is the same as the state of charge interval of the energy storage battery in the current sampling period, and the power of the energy storage converter is stable in the current state of charge interval for a period of time, the slope of the active-frequency droop curve of the energy storage converter is adjusted to be: korig/k_scale (SOC_Reg_Last-2);
When the state of charge interval of the energy storage battery in the current sampling period is between 1 and 5, the state of charge interval of the energy storage battery in the previous sampling period is between-5 and-1, and the power of the energy storage converter is stable at the current sampling moment, the slope of the active-frequency droop curve of the energy storage converter is adjusted to be: korig/k_scale (-4-SOC_Reg_Last);
When the state of charge interval of the energy storage battery in the current sampling period is between-5 and-1, the state of charge interval of the energy storage battery in the previous sampling period is between-5 and-1 and is different from the state of charge interval of the energy storage battery in the current sampling period, and when the power of the energy storage converter is stable at the current sampling moment, the slope of the active-frequency droop curve of the energy storage converter is adjusted to be: korig/k_scale (-4-SOC_Reg_Last);
When the charge state interval of the energy storage battery in the current sampling period is between-5 and-1, and the charge state interval of the energy storage battery in the previous sampling period is the same as the charge state interval of the energy storage battery in the current sampling period, and the power of the energy storage converter is stable in the current charge state interval for a period of time, the slope of the active-frequency droop curve of the energy storage converter is adjusted to be: korig/k_scale (-4-SOC_Reg_Last);
when the charge state interval of the energy storage battery in the current sampling period is between-5 and-1, the charge state interval of the energy storage battery in the previous sampling period is between 1 and 5, and the power of the energy storage converter is stable at the current sampling moment, the slope of the active-frequency droop curve of the energy storage converter is adjusted to be: korig/k_scale (SOC_Reg_Last-2);
Wherein Korig is the slope of the initial active-frequency sag curve of the energy storage converter, k_scale is the slope adjustment coefficient of the active-frequency sag curve of the energy storage converter, k_scale >1, and soc_reg_last is the state of charge interval of the energy storage battery in the last sampling period.
2. The method of claim 1, wherein determining the charge-discharge state of the energy storage converter based on the power of the energy storage converter comprises:
When the power of the energy storage converter is positive in the current sampling period, the charging and discharging states of the energy storage converter are discharging states;
when the power of the energy storage converter is negative in the current sampling period, the charging and discharging states of the energy storage converter are charging states;
When the power of the energy storage converter is positive and negative in the current sampling period, the charging and discharging states of the energy storage converter are the same as those of the energy storage converter in the previous sampling period.
3. The method of claim 1, wherein determining the power stability of the energy storage converter based on the power of the energy storage converter comprises:
if the difference between the maximum value and the minimum value of the power of the energy storage converter in the current sampling period is smaller than the threshold value, the power of the energy storage converter is stable, otherwise, the power of the energy storage converter is unstable.
4. The method of claim 1, wherein the method further comprises: and when the energy storage converter is abnormal in communication with the energy management system, executing the method.
5. An energy storage converter single-machine energy in-situ control device, characterized in that the device comprises:
The first determining module is used for determining the charge and discharge states and the power stability of the energy storage converter based on the power of the energy storage converter;
the second determining module is used for determining a charge state interval of the energy storage battery based on the charge state of the energy storage battery;
the adjusting module is used for adjusting an active-frequency droop curve of the energy storage converter based on the charge state interval of the energy storage battery, the charge and discharge state of the energy storage converter and the power stability;
The second determining module is specifically configured to:
When the energy storage battery is in a discharging state and the state of charge is between 90 and 100, the state of charge interval of the energy storage battery is 1;
when the energy storage battery is in a discharging state and the state of charge is between 40 and 90, the state of charge interval of the energy storage battery is 2;
when the energy storage battery is in a discharging state and the state of charge is between 30 and 40, the state of charge interval of the energy storage battery is 3;
when the energy storage battery is in a discharging state and the state of charge is between 20 and 30, the state of charge interval of the energy storage battery is 4;
When the energy storage battery is in a discharging state and the state of charge is between 0 and 20, the state of charge interval of the energy storage battery is 5;
When the energy storage battery is in a charging state and the charging state is between 90 and 100, the charging state interval of the energy storage battery is-1;
when the energy storage battery is in a charging state and the charging state is between 80 and 90, the charging state interval of the energy storage battery is-2;
when the energy storage battery is in a charged state and the charged state is between 50 and 80, the charged state interval of the energy storage battery is-3;
when the energy storage battery is in a charging state and the charging state is between 30 and 50, the charging state interval of the energy storage battery is-4;
when the energy storage battery is in a charging state and the charging state is between 0 and 30, the charging state interval of the energy storage battery is-5;
The adjusting module is specifically used for:
When the state of charge interval of the energy storage battery in the current sampling period is between 1 and 5, and the state of charge interval of the energy storage battery in the previous sampling period is between 1 and 5 and is different from the state of charge interval of the energy storage battery in the current sampling period, and when the power of the energy storage converter is stable at the current sampling moment, the slope of the active-frequency sagging curve of the energy storage converter is adjusted to be: korig/k_scale (SOC_Reg_Last-2);
When the state of charge interval of the energy storage battery in the current sampling period is between 1 and 5, and the state of charge interval of the energy storage battery in the previous sampling period is the same as the state of charge interval of the energy storage battery in the current sampling period, and the power of the energy storage converter is stable in the current state of charge interval for a period of time, the slope of the active-frequency droop curve of the energy storage converter is adjusted to be: korig/k_scale (SOC_Reg_Last-2);
When the state of charge interval of the energy storage battery in the current sampling period is between 1 and 5, the state of charge interval of the energy storage battery in the previous sampling period is between-5 and-1, and the power of the energy storage converter is stable at the current sampling moment, the slope of the active-frequency droop curve of the energy storage converter is adjusted to be: korig/k_scale (-4-SOC_Reg_Last);
When the state of charge interval of the energy storage battery in the current sampling period is between-5 and-1, the state of charge interval of the energy storage battery in the previous sampling period is between-5 and-1 and is different from the state of charge interval of the energy storage battery in the current sampling period, and when the power of the energy storage converter is stable at the current sampling moment, the slope of the active-frequency droop curve of the energy storage converter is adjusted to be: korig/k_scale (-4-SOC_Reg_Last);
When the charge state interval of the energy storage battery in the current sampling period is between-5 and-1, and the charge state interval of the energy storage battery in the previous sampling period is the same as the charge state interval of the energy storage battery in the current sampling period, and the power of the energy storage converter is stable in the current charge state interval for a period of time, the slope of the active-frequency droop curve of the energy storage converter is adjusted to be: korig/k_scale (-4-SOC_Reg_Last);
when the charge state interval of the energy storage battery in the current sampling period is between-5 and-1, the charge state interval of the energy storage battery in the previous sampling period is between 1 and 5, and the power of the energy storage converter is stable at the current sampling moment, the slope of the active-frequency droop curve of the energy storage converter is adjusted to be: korig/k_scale (SOC_Reg_Last-2);
Wherein Korig is the slope of the initial active-frequency sag curve of the energy storage converter, k_scale is the slope adjustment coefficient of the active-frequency sag curve of the energy storage converter, k_scale >1, and soc_reg_last is the state of charge interval of the energy storage battery in the last sampling period.
6. The apparatus of claim 5, wherein the first determination module is specifically configured to:
When the power of the energy storage converter is positive in the current sampling period, the charging and discharging states of the energy storage converter are discharging states;
when the power of the energy storage converter is negative in the current sampling period, the charging and discharging states of the energy storage converter are charging states;
When the power of the energy storage converter is positive and negative in the current sampling period, the charging and discharging states of the energy storage converter are the same as those of the energy storage converter in the previous sampling period.
7. The apparatus of claim 5, wherein the first determination module is specifically configured to:
if the difference between the maximum value and the minimum value of the power of the energy storage converter in the current sampling period is smaller than the threshold value, the power of the energy storage converter is stable, otherwise, the power of the energy storage converter is unstable.
8. The apparatus as claimed in claim 5, comprising: and when the energy storage converter is abnormal in communication with the energy management system, starting the device.
9. A computer device, comprising: one or more processors;
The processor is used for storing one or more programs;
The energy storage converter single machine energy in-situ control method of any one of claims 1 to 4 when the one or more programs are executed by the one or more processors.
10. A computer readable storage medium, characterized in that a computer program is stored thereon, which computer program, when executed, implements the energy storage converter single-energy in-situ control method according to any one of claims 1 to 4.
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| CN112886623A (en) * | 2021-01-12 | 2021-06-01 | 中国电力科学研究院有限公司 | Energy storage converter VSG mode energy management coordination control method and system |
| CN112952874A (en) * | 2021-01-22 | 2021-06-11 | 中国电力科学研究院有限公司 | Independent microgrid energy storage converter single-machine energy autonomous control method and system |
| CN113949077A (en) * | 2021-10-26 | 2022-01-18 | 燕山大学 | Energy storage primary frequency modulation control method based on SOC (System on chip) sine function |
| CN114006442A (en) * | 2021-11-26 | 2022-02-01 | 国网甘肃省电力公司电力科学研究院 | Battery energy storage power station energy management method considering charge state consistency |
| CN114301103A (en) * | 2022-03-09 | 2022-04-08 | 山东大学 | Wind storage coordinated direct-drive wind turbine generator control method and system |
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