CN117691618B - Transient reactive voltage control method in power grid operation process - Google Patents
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Abstract
The invention relates to the technical field of reactive voltage control, in particular to a transient reactive voltage control method in a power grid operation process, which comprises the following steps: step one, monitoring an active power signal and an apparent power signal sent by a power station, and calculating a reactive power signal A1 sent by the power station; monitoring the voltage of a grid-connected point of a power station, and calculating the reactive power shortage A2 of the grid-connected point of the power station; step two, when A1 is smaller than A2, calculating reactive compensation signals delta A, delta A=A2-A1; step three, calculating a capacity threshold C0 of the energy storage system according to the reactive compensation time S of the power grid and the reactive signal upper limit value B1 of the energy storage system by combining the reactive compensation signal delta A; adjusting a capacity threshold C0 according to the operation information of the energy storage system; step four, acquiring a current capacity value C1 of the energy storage system, comparing the current capacity value C1 with a capacity threshold value C0, and determining a reactive compensation strategy of the energy storage system; the energy storage system performs stable reactive compensation within the reactive compensation time of the power grid, and the running stability of the power grid is improved.
Description
Technical Field
The invention relates to the technical field of reactive voltage control, in particular to a transient reactive voltage control method in a power grid operation process.
Background
The reactive voltage is mainly used for maintaining the stable operation of the power grid, and can be used for adjusting and controlling the voltage of the power grid through reactive power transmission and adjustment in the power grid. When the load of the power grid changes or the power generation capacity fluctuates, the reasonable adjustment of the reactive voltage can keep the voltage of the power grid stable, avoid the influence of voltage reduction or overhigh on power equipment and loads, reduce tide loss and improve the power supply quality and reliability of the power grid.
The energy storage system plays a key role in reactive voltage regulation of the power grid. Because the centralized energy storage system has higher response speed and flexibility, the reactive power can be regulated by scheduling the charging and discharging processes of the energy storage system, and the reactive voltage can be controlled. Specifically, when the reactive power of the power grid is lack or excessive, the energy storage system can quickly inject or absorb the reactive power, adjust the reactive voltage in the power grid and keep the voltage of the power grid stable.
In the prior art, when the reactive voltage of the power grid is regulated through the energy storage system, only the compensation value of the reactive voltage and the reactive voltage compensation upper limit of the energy storage system are generally considered, and the capacity problem of the energy storage system is ignored. When the capacity of the energy storage system is insufficient to support the reactive compensation time of the power grid, the problems of power factor reduction, unstable voltage or frequency fluctuation of the power grid and the like are caused. The energy storage system is subjected to frequent charge and discharge cycles, so that energy loss in the energy conversion and transmission processes is increased, and the service life of the energy storage system is influenced.
How to control the reactive voltage of the power grid according to the actual situation of the energy storage system is a problem to be solved by those skilled in the art.
Disclosure of Invention
In view of the above, the invention provides a transient reactive voltage control method in the running process of a power grid, which determines the compensation voltage of an energy storage system to the power grid by calculating the capacity threshold value of the energy storage system, ensures that the energy storage system performs stable reactive voltage compensation to the power grid within reactive compensation time, and improves the running stability of the power grid.
In order to achieve the above purpose, the present invention provides the following technical solutions:
preferably, the method for controlling the transient reactive voltage in the power grid operation process includes:
Step one, monitoring an active power signal and an apparent power signal sent by a power station, and calculating a reactive power signal A1 sent by the power station; monitoring the voltage of a grid-connected point of a power station, and calculating the reactive power shortage A2 of the grid-connected point of the power station;
step two, comparing a reactive power signal A1 of the power plant with a reactive power deficiency A2, and outputting all the reactive power deficiency A2 by the power station when A1 is larger than A2; when A1 is smaller than A2, calculating a reactive compensation signal Δa, Δa=a2-A1;
Step three, calculating a capacity threshold C0 of the energy storage system according to the reactive compensation time S of the power grid and the reactive signal upper limit value B1 of the energy storage system by combining the reactive compensation signal delta A; adjusting a capacity threshold C0 according to the operation information of the energy storage system;
And step four, acquiring a current capacity value C1 of the energy storage system, comparing the current capacity value C1 with a capacity threshold value C0, and determining a reactive compensation strategy of the energy storage system.
Preferably, in the above method for controlling a transient reactive voltage during a power grid operation, the calculating the capacity threshold C0 of the energy storage system according to the reactive compensation time S of the power grid and the reactive compensation upper limit value B1 of the energy storage system and combining the reactive compensation signal Δa includes:
when the reactive compensation signal delta A is smaller than or equal to the reactive signal upper limit value B1, the energy storage system uses the reactive compensation signal delta A to perform reactive voltage compensation on the power grid; calculating the capacity C0=ΔA×S required by the energy storage system;
when the reactive compensation signal delta A is larger than the reactive signal upper limit value B1, the energy storage system uses the reactive signal upper limit value B1 to perform reactive voltage compensation on the power grid; the capacity c0=b1×s required for the energy storage system is calculated.
Preferably, in the above method for controlling a transient reactive voltage in a power grid operation process, the adjusting the capacity threshold C0 according to operation information of the energy storage system includes:
acquiring charge and discharge efficiency E of an energy storage system, and determining a charge and discharge adjustment coefficient F of the energy storage system;
Acquiring temperature information G of an energy storage system, and determining a temperature regulation coefficient H of the energy storage system;
acquiring the cycle number I of the energy storage system, and determining the life adjustment coefficient J of the energy storage system;
the capacity threshold C0 is adjusted, after which c0=c0×f×h×j.
Preferably, in the above method for controlling a transient reactive voltage in a power grid operation process, the obtaining the charging and discharging efficiency E of the energy storage system and determining the charging and discharging adjustment coefficient F of the energy storage system include:
Presetting a first preset charge-discharge efficiency E1, a second preset charge-discharge efficiency E2, a third preset charge-discharge efficiency E3 and a fourth preset charge-discharge efficiency E4, wherein E1 is more than E2 and less than E3 and less than E4; presetting a first charge-discharge regulating coefficient F1, a second charge-discharge regulating coefficient F2, a third charge-discharge regulating coefficient F3 and a fourth charge-discharge regulating coefficient F4, wherein 1.1 is more than F1 and more than F2 is more than F3 and more than F4 is more than 1;
determining a charge and discharge adjustment coefficient F of the energy storage system according to the relation between the charge and discharge efficiency E of the energy storage system and each preset charge and discharge efficiency:
When E is smaller than E1, determining a charge-discharge adjustment coefficient of the energy storage system as a first charge-discharge adjustment coefficient F1, wherein after adjustment, C0=C0×F1;
when E1 is less than or equal to E2, determining that the charge and discharge adjustment coefficient of the energy storage system is a second charge and discharge adjustment coefficient F2, wherein after adjustment, C0=C0×F2;
When E2 is less than or equal to E3, determining that the charge and discharge adjustment coefficient of the energy storage system is a third charge and discharge adjustment coefficient F3, wherein after adjustment, C0=C0×F3;
When E3 is less than or equal to E4, determining that the charge and discharge adjustment coefficient of the energy storage system is a fourth charge and discharge adjustment coefficient F4, wherein after adjustment, C0=C0×F4;
And when E4 is less than or equal to E, determining that the charge and discharge adjustment coefficient of the energy storage system is 1.
Preferably, in the above method for controlling a transient reactive voltage in a power grid operation process, the obtaining temperature information G of the energy storage system and determining a temperature adjustment coefficient H of the energy storage system include:
presetting an energy storage coefficient running temperature value K, and calculating a difference value L between a current temperature value G and the preset temperature value K;
after determining that the charge-discharge adjustment coefficient Fi of the energy storage system adjusts the capacity threshold C0, c0=c0×fi, i=1, 2,3,4;
Presetting a first preset temperature difference value L1, a second preset temperature difference value L2, a third preset temperature difference value L3 and a fourth preset temperature difference value L4, wherein L1 is more than L2 and less than L3 and less than L4; presetting a first temperature regulation coefficient H1, a second temperature regulation coefficient H2, a third temperature regulation coefficient H3 and a fourth temperature regulation coefficient H4, wherein H1 is more than 1 and H2 is more than 1 and H3 is more than 3 and H4 is more than 1.1;
Determining a temperature regulation coefficient H of the energy storage system according to the relation between the temperature difference L of the energy storage system and each preset temperature difference:
when L < L1, determining a temperature adjustment coefficient of the energy storage system as a first temperature adjustment coefficient H1, wherein c0=c0×fi×h1 after adjustment;
When L1 is less than or equal to L2, determining that the temperature regulation coefficient of the energy storage system is a second temperature regulation coefficient H2, wherein C0=C0 is Fi H2 after regulation;
when L2 is less than or equal to L3, determining that the temperature regulation coefficient of the energy storage system is a third temperature regulation coefficient H3, wherein C0=C0 is Fi H3 after regulation;
when L3 is less than or equal to L4, determining that the temperature regulation coefficient of the energy storage system is a fourth temperature regulation coefficient H4, wherein C0=C0 is Fi H4 after regulation;
and when L4 is less than or equal to L, determining the temperature regulation coefficient of the energy storage system to be 1, wherein C0=C0 and Fi are 1 after regulation.
Preferably, in the above method for controlling a transient reactive voltage in a power grid operation process, the obtaining the cycle number I of the energy storage system and determining the life adjustment coefficient J of the energy storage system include:
after determining the temperature adjustment coefficient Hi of the energy storage system to adjust the capacity threshold C0, c0=c0×fi×hi, i=1, 2,3,4;
Presetting a first preset cycle number I1, a second preset cycle number I2, a third preset cycle number I3 and a fourth preset cycle number I4, wherein I1 is more than I2 and less than I3 and less than I4; presetting a first life adjustment coefficient J1, a second life adjustment coefficient J2, a third life adjustment coefficient J3 and a fourth life adjustment coefficient J4, wherein J1 is more than 1 and less than J2, J3 is more than 1 and less than 3 and less than 1.1;
determining a life adjustment coefficient J of the energy storage system according to the relation between the cycle number I of the energy storage system and each preset cycle number:
when I < I1, determining a life adjustment coefficient of the energy storage system as a first life adjustment coefficient J1, wherein c0=c0×fi×j1 after adjustment;
when I1 is less than or equal to I2, determining that the life adjustment coefficient of the energy storage system is a second life adjustment coefficient J2, wherein C0=C0=Fi+Hi+J2 after adjustment;
When I2 is less than or equal to I3, determining that the life adjustment coefficient of the energy storage system is a third life adjustment coefficient J3, wherein C0=C0=Fi+Hi+J 3 after adjustment;
When I3 is less than or equal to I4, determining that the life adjustment coefficient of the energy storage system is a fourth life adjustment coefficient J4, wherein C0=C0=Fi+Hi after adjustment;
and when I4 is less than or equal to I, determining that the service life adjustment coefficient of the energy storage system is 1, wherein C0=C0, fi and Hi are 1 after adjustment.
Preferably, in the above method for controlling a transient reactive voltage in a power grid operation process, the obtaining a current capacity value C1 of an energy storage system, comparing the current capacity value C1 with a capacity threshold value C0, and determining a reactive compensation strategy of the energy storage system includes:
setting a lower limit C2 of the capacity of the energy storage system;
Acquiring a current capacity value C1 of the energy storage system, and comparing the current capacity value C1 with an adjusted capacity threshold C0 and a capacity lower limit C2;
When C1 is less than C2, the energy storage system does not perform reactive compensation on the power grid;
when C1 is larger than C0 and the upper limit value B1 of the reactive signal is larger than the reactive compensation signal delta A, the energy storage system uses the reactive compensation signal delta A to perform reactive voltage compensation on the power grid;
when C1 is larger than C0 and the reactive signal upper limit value B1 is smaller than the reactive compensation signal delta A, the energy storage system uses the reactive signal upper limit value B1 to perform reactive voltage compensation on the power grid;
when C1 is smaller than C0 and the upper limit value B1 of the reactive signal is larger than the reactive compensation signal delta A, the energy storage system uses the reactive voltage of delta A (C1/C0) to compensate the power grid;
When C1 is less than C0 and the reactive upper limit B1 is less than the reactive compensation signal Δa, the energy storage system compensates the grid with a reactive voltage of B1 x (C1/C0).
Compared with the prior art, the invention has the beneficial effects that:
1. And the compensation voltage of the energy storage system to the power grid is determined by calculating the capacity threshold value of the energy storage system, so that the energy storage system can perform stable reactive voltage compensation to the power grid within reactive compensation time, and the running stability of the power grid is improved.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present invention, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic flow chart of the method of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. 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. The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. 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.
In the present invention, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; the term "plurality" means two or more, unless expressly defined otherwise. The terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; "coupled" may be directly coupled or indirectly coupled through intermediaries. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the description of the present invention, it should be understood that the directions or positional relationships indicated by the terms "upper", "lower", "left", "right", "front", "rear", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or units referred to must have a specific direction, be constructed and operated in a specific direction, and thus should not be construed as limiting the present invention.
In the description of the present specification, the terms "one embodiment," "some embodiments," "particular embodiments," and the like, mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The embodiment of the invention discloses a transient reactive voltage control method in a power grid operation process, which comprises the following steps:
Step one, monitoring an active power signal and an apparent power signal sent by a power station, and calculating a reactive power signal A1 sent by the power station; monitoring the voltage of a grid-connected point of a power station, and calculating the reactive power shortage A2 of the grid-connected point of the power station;
step two, comparing a reactive power signal A1 of the power plant with a reactive power deficiency A2, and outputting all the reactive power deficiency A2 by the power station when A1 is larger than A2; when A1 is smaller than A2, calculating a reactive compensation signal Δa, Δa=a2-A1;
in the above steps, the calculation of the reactive power signal and the reactive deficiency are well known to the person skilled in the art.
Step three, calculating a capacity threshold C0 of the energy storage system according to the reactive compensation time S of the power grid and the reactive signal upper limit value B1 of the energy storage system by combining the reactive compensation signal delta A; adjusting a capacity threshold C0 according to the operation information of the energy storage system;
the method comprises the following specific steps:
when the reactive compensation signal delta A is smaller than or equal to the reactive signal upper limit value B1, the energy storage system uses the reactive compensation signal delta A to perform reactive voltage compensation on the power grid; calculating the capacity C0=ΔA×S required by the energy storage system;
when the reactive compensation signal delta A is larger than the reactive signal upper limit value B1, the energy storage system uses the reactive signal upper limit value B1 to perform reactive voltage compensation on the power grid; the capacity c0=b1×s required for the energy storage system is calculated.
Acquiring the charge and discharge efficiency E of the energy storage system, and determining the charge and discharge adjustment coefficient F of the energy storage system, wherein the method comprises the following steps:
Presetting a first preset charge-discharge efficiency E1, a second preset charge-discharge efficiency E2, a third preset charge-discharge efficiency E3 and a fourth preset charge-discharge efficiency E4, wherein E1 is more than E2 and less than E3 and less than E4; presetting a first charge-discharge regulating coefficient F1, a second charge-discharge regulating coefficient F2, a third charge-discharge regulating coefficient F3 and a fourth charge-discharge regulating coefficient F4, wherein 1.1 is more than F1 and more than F2 is more than F3 and more than F4 is more than 1;
determining a charge and discharge adjustment coefficient F of the energy storage system according to the relation between the charge and discharge efficiency E of the energy storage system and each preset charge and discharge efficiency:
When E is smaller than E1, determining a charge-discharge adjustment coefficient of the energy storage system as a first charge-discharge adjustment coefficient F1, wherein after adjustment, C0=C0×F1;
when E1 is less than or equal to E2, determining that the charge and discharge adjustment coefficient of the energy storage system is a second charge and discharge adjustment coefficient F2, wherein after adjustment, C0=C0×F2;
When E2 is less than or equal to E3, determining that the charge and discharge adjustment coefficient of the energy storage system is a third charge and discharge adjustment coefficient F3, wherein after adjustment, C0=C0×F3;
When E3 is less than or equal to E4, determining that the charge and discharge adjustment coefficient of the energy storage system is a fourth charge and discharge adjustment coefficient F4, wherein after adjustment, C0=C0×F4;
And when E4 is less than or equal to E, determining that the charge and discharge adjustment coefficient of the energy storage system is 1.
Acquiring temperature information G of an energy storage system, and determining a temperature adjustment coefficient H of the energy storage system, wherein the method comprises the following steps:
presetting an energy storage coefficient running temperature value K, and calculating a difference value L between a current temperature value G and the preset temperature value K;
after determining that the charge-discharge adjustment coefficient Fi of the energy storage system adjusts the capacity threshold C0, c0=c0×fi, i=1, 2,3,4;
Presetting a first preset temperature difference value L1, a second preset temperature difference value L2, a third preset temperature difference value L3 and a fourth preset temperature difference value L4, wherein L1 is more than L2 and less than L3 and less than L4; presetting a first temperature regulation coefficient H1, a second temperature regulation coefficient H2, a third temperature regulation coefficient H3 and a fourth temperature regulation coefficient H4, wherein H1 is more than 1 and H2 is more than 1 and H3 is more than 3 and H4 is more than 1.1;
Determining a temperature regulation coefficient H of the energy storage system according to the relation between the temperature difference L of the energy storage system and each preset temperature difference:
when L < L1, determining a temperature adjustment coefficient of the energy storage system as a first temperature adjustment coefficient H1, wherein c0=c0×fi×h1 after adjustment;
When L1 is less than or equal to L2, determining that the temperature regulation coefficient of the energy storage system is a second temperature regulation coefficient H2, wherein C0=C0 is Fi H2 after regulation;
when L2 is less than or equal to L3, determining that the temperature regulation coefficient of the energy storage system is a third temperature regulation coefficient H3, wherein C0=C0 is Fi H3 after regulation;
when L3 is less than or equal to L4, determining that the temperature regulation coefficient of the energy storage system is a fourth temperature regulation coefficient H4, wherein C0=C0 is Fi H4 after regulation;
and when L4 is less than or equal to L, determining the temperature regulation coefficient of the energy storage system to be 1, wherein C0=C0 and Fi are 1 after regulation.
Acquiring the cycle number I of the energy storage system, and determining the life adjustment coefficient J of the energy storage system, wherein the method comprises the following steps:
after determining the temperature adjustment coefficient Hi of the energy storage system to adjust the capacity threshold C0, c0=c0×fi×hi, i=1, 2,3,4;
Presetting a first preset cycle number I1, a second preset cycle number I2, a third preset cycle number I3 and a fourth preset cycle number I4, wherein I1 is more than I2 and less than I3 and less than I4; presetting a first life adjustment coefficient J1, a second life adjustment coefficient J2, a third life adjustment coefficient J3 and a fourth life adjustment coefficient J4, wherein J1 is more than 1 and less than J2, J3 is more than 1 and less than 3 and less than 1.1;
determining a life adjustment coefficient J of the energy storage system according to the relation between the cycle number I of the energy storage system and each preset cycle number:
when I < I1, determining a life adjustment coefficient of the energy storage system as a first life adjustment coefficient J1, wherein c0=c0×fi×j1 after adjustment;
when I1 is less than or equal to I2, determining that the life adjustment coefficient of the energy storage system is a second life adjustment coefficient J2, wherein C0=C0=Fi+Hi+J2 after adjustment;
When I2 is less than or equal to I3, determining that the life adjustment coefficient of the energy storage system is a third life adjustment coefficient J3, wherein C0=C0=Fi+Hi+J 3 after adjustment;
When I3 is less than or equal to I4, determining that the life adjustment coefficient of the energy storage system is a fourth life adjustment coefficient J4, wherein C0=C0=Fi+Hi after adjustment;
and when I4 is less than or equal to I, determining that the service life adjustment coefficient of the energy storage system is 1, wherein C0=C0, fi and Hi are 1 after adjustment.
In the above steps, the magnitude of each adjustment coefficient is obtained according to the experience and test of the worker, and is not described.
The above steps are to be noted that the cycle number, the temperature and the charge-discharge efficiency are important reference conditions for the capacity utilization rate, and the accuracy of determining the capacity threshold can be improved by adjusting the conditions.
And step four, acquiring a current capacity value C1 of the energy storage system, comparing the current capacity value C1 with a capacity threshold value C0, and determining a reactive compensation strategy of the energy storage system.
The method comprises the following specific steps:
setting a lower limit C2 of the capacity of the energy storage system;
Acquiring a current capacity value C1 of the energy storage system, and comparing the current capacity value C1 with an adjusted capacity threshold C0 and a capacity lower limit C2;
When C1 is less than C2, the energy storage system does not perform reactive compensation on the power grid;
when C1 is larger than C0 and the upper limit value B1 of the reactive signal is larger than the reactive compensation signal delta A, the energy storage system uses the reactive compensation signal delta A to perform reactive signal compensation on the power grid;
When C1 is larger than C0 and the reactive signal upper limit value B1 is smaller than the reactive compensation signal delta A, the energy storage system uses the reactive signal upper limit value B1 to perform reactive signal compensation on the power grid;
when C1 is smaller than C0 and the upper limit value B1 of the reactive signal is larger than the reactive compensation signal delta A, the energy storage system uses the reactive signal of delta A (C1/C0) to compensate the power grid;
When C1 is less than C0 and the reactive upper limit B1 is less than the reactive compensation signal Δa, the energy storage system compensates the grid using the B1 (C1/C0) reactive signal.
The method has the advantages that the corresponding strategy is determined according to the current capacity of the energy storage system, so that stable reactive compensation can be performed in the reactive compensation time of the power grid, and the running stability of the power grid is improved.
It should be noted that, in the foregoing embodiment, only the division of the foregoing functional modules is illustrated, and in practical application, the foregoing functional allocation may be performed by different functional modules according to needs, that is, the modules or steps in the embodiment of the present invention are further decomposed or combined, for example, the modules in the foregoing embodiment may be combined into one module, or may be further split into multiple sub-modules, so as to complete all or part of the functions described above. The names of the modules and steps related to the embodiments of the present invention are merely for distinguishing the respective modules or steps, and are not to be construed as unduly limiting the present invention.
The terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus/apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus/apparatus.
Thus far, the technical solution of the present invention has been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of protection of the present invention is not limited to these specific embodiments. Equivalent modifications and substitutions for related technical features may be made by those skilled in the art without departing from the principles of the present invention, and such modifications and substitutions will be within the scope of the present invention.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the appended claims and their equivalents, the present invention is intended to include such modifications and variations as would be included in the above description of the disclosed embodiments, enabling those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (2)
1. A method for transient reactive voltage control during operation of a power grid, comprising:
Step one, monitoring an active power signal and an apparent power signal sent by a power station, and calculating a reactive power signal A1 sent by the power station; monitoring the voltage of a grid-connected point of a power station, and calculating the reactive power shortage A2 of the grid-connected point of the power station;
step two, comparing a reactive power signal A1 of the power plant with a reactive power deficiency A2, and outputting all the reactive power deficiency A2 by the power station when A1 is larger than A2; when A1 is smaller than A2, calculating a reactive compensation signal Δa, Δa=a2-A1;
Step three, calculating a capacity threshold C0 of the energy storage system according to the reactive compensation time S of the power grid and the reactive signal upper limit value B1 of the energy storage system by combining the reactive compensation signal delta A; adjusting a capacity threshold C0 according to the operation information of the energy storage system;
Step four, acquiring a current capacity value C1 of the energy storage system, comparing the current capacity value C1 with a capacity threshold value C0, and determining a reactive compensation strategy of the energy storage system;
The calculating the capacity threshold value C0 of the energy storage system according to the reactive compensation time S of the power grid and the reactive compensation upper limit value B1 of the energy storage system and combining the reactive compensation signal Δa includes:
when the reactive compensation signal delta A is smaller than or equal to the reactive signal upper limit value B1, the energy storage system uses the reactive compensation signal delta A to perform reactive voltage compensation on the power grid; calculating the capacity C0=ΔA×S required by the energy storage system;
When the reactive compensation signal delta A is larger than the reactive signal upper limit value B1, the energy storage system uses the reactive signal upper limit value B1 to perform reactive voltage compensation on the power grid; calculating the capacity C0=B1×S required by the energy storage system;
the adjusting the capacity threshold C0 according to the operation information of the energy storage system includes:
acquiring charge and discharge efficiency E of an energy storage system, and determining a charge and discharge adjustment coefficient F of the energy storage system;
Acquiring temperature information G of an energy storage system, and determining a temperature regulation coefficient H of the energy storage system;
acquiring the cycle number I of the energy storage system, and determining the life adjustment coefficient J of the energy storage system;
Adjusting the capacity threshold C0, wherein c0=c0×f×h×j after adjustment;
the step of obtaining the charge and discharge efficiency E of the energy storage system and determining the charge and discharge adjustment coefficient F of the energy storage system comprises the following steps:
Presetting a first preset charge-discharge efficiency E1, a second preset charge-discharge efficiency E2, a third preset charge-discharge efficiency E3 and a fourth preset charge-discharge efficiency E4, wherein E1 is more than E2 and less than E3 and less than E4; presetting a first charge-discharge regulating coefficient F1, a second charge-discharge regulating coefficient F2, a third charge-discharge regulating coefficient F3 and a fourth charge-discharge regulating coefficient F4, wherein 1.1 is more than F1 and more than F2 is more than F3 and more than F4 is more than 1;
determining a charge and discharge adjustment coefficient F of the energy storage system according to the relation between the charge and discharge efficiency E of the energy storage system and each preset charge and discharge efficiency:
When E is smaller than E1, determining a charge-discharge adjustment coefficient of the energy storage system as a first charge-discharge adjustment coefficient F1, wherein after adjustment, C0=C0×F1;
when E1 is less than or equal to E2, determining that the charge and discharge adjustment coefficient of the energy storage system is a second charge and discharge adjustment coefficient F2, wherein after adjustment, C0=C0×F2;
When E2 is less than or equal to E3, determining that the charge and discharge adjustment coefficient of the energy storage system is a third charge and discharge adjustment coefficient F3, wherein after adjustment, C0=C0×F3;
When E3 is less than or equal to E4, determining that the charge and discharge adjustment coefficient of the energy storage system is a fourth charge and discharge adjustment coefficient F4, wherein after adjustment, C0=C0×F4;
When E4 is less than or equal to E, determining that the charge-discharge adjustment coefficient of the energy storage system is 1;
the step of obtaining the temperature information G of the energy storage system and determining the temperature adjustment coefficient H of the energy storage system comprises the following steps:
presetting an energy storage coefficient running temperature value K, and calculating a difference value L between a current temperature value G and the preset temperature value K;
after determining that the charge-discharge adjustment coefficient Fi of the energy storage system adjusts the capacity threshold C0, c0=c0×fi, i=1, 2,3,4;
Presetting a first preset temperature difference value L1, a second preset temperature difference value L2, a third preset temperature difference value L3 and a fourth preset temperature difference value L4, wherein L1 is more than L2 and less than L3 and less than L4; presetting a first temperature regulation coefficient H1, a second temperature regulation coefficient H2, a third temperature regulation coefficient H3 and a fourth temperature regulation coefficient H4, wherein H1 is more than 1 and H2 is more than 1 and H3 is more than 3 and H4 is more than 1.1;
Determining a temperature regulation coefficient H of the energy storage system according to the relation between the temperature difference L of the energy storage system and each preset temperature difference:
when L < L1, determining a temperature adjustment coefficient of the energy storage system as a first temperature adjustment coefficient H1, wherein c0=c0×fi×h1 after adjustment;
When L1 is less than or equal to L2, determining that the temperature regulation coefficient of the energy storage system is a second temperature regulation coefficient H2, wherein C0=C0 is Fi H2 after regulation;
when L2 is less than or equal to L3, determining that the temperature regulation coefficient of the energy storage system is a third temperature regulation coefficient H3, wherein C0=C0 is Fi H3 after regulation;
when L3 is less than or equal to L4, determining that the temperature regulation coefficient of the energy storage system is a fourth temperature regulation coefficient H4, wherein C0=C0 is Fi H4 after regulation;
When L4 is less than or equal to L, determining a temperature adjustment coefficient of the energy storage system to be 1, wherein c0=c0×fi×1 after adjustment;
The cycle number I of the energy storage system is obtained, and the service life adjustment coefficient J of the energy storage system is determined, which comprises the following steps:
after determining the temperature adjustment coefficient Hi of the energy storage system to adjust the capacity threshold C0, c0=c0×fi×hi, i=1, 2,3,4;
Presetting a first preset cycle number I1, a second preset cycle number I2, a third preset cycle number I3 and a fourth preset cycle number I4, wherein I1 is more than I2 and less than I3 and less than I4; presetting a first life adjustment coefficient J1, a second life adjustment coefficient J2, a third life adjustment coefficient J3 and a fourth life adjustment coefficient J4, wherein J1 is more than 1 and less than J2, J3 is more than 1 and less than 3 and less than 1.1;
determining a life adjustment coefficient J of the energy storage system according to the relation between the cycle number I of the energy storage system and each preset cycle number:
When I < I1, determining a life adjustment coefficient of the energy storage system as a first life adjustment coefficient J1, wherein c0=c0×fi×j1 after adjustment;
when I1 is less than or equal to I2, determining that the life adjustment coefficient of the energy storage system is a second life adjustment coefficient J2, wherein C0=C0=Fi+Hi+J2 after adjustment;
When I2 is less than or equal to I3, determining that the life adjustment coefficient of the energy storage system is a third life adjustment coefficient J3, wherein C0=C0=Fi+Hi+J 3 after adjustment;
when I3 is less than or equal to I4, determining that the life adjustment coefficient of the energy storage system is a fourth life adjustment coefficient J4, wherein C0=C0=Fi+Hi after adjustment;
and when I4 is less than or equal to I, determining that the service life adjustment coefficient of the energy storage system is 1, wherein C0=C0, fi and Hi are 1 after adjustment.
2. The method for controlling a transient reactive voltage during a power grid operation according to claim 1, wherein the obtaining a current capacity value C1 of the energy storage system, comparing the current capacity value C1 with a capacity threshold C0, and determining a reactive compensation strategy of the energy storage system includes:
setting a lower limit C2 of the capacity of the energy storage system;
Acquiring a current capacity value C1 of the energy storage system, and comparing the current capacity value C1 with an adjusted capacity threshold C0 and a capacity lower limit C2;
When C1 is less than C2, the energy storage system does not perform reactive compensation on the power grid;
When C1 is larger than C0 and the upper limit value B1 of the reactive signal is larger than the reactive compensation signal delta A, the energy storage system uses the reactive compensation signal delta A to perform reactive voltage compensation on the power grid;
when C1 is larger than C0 and the reactive signal upper limit value B1 is smaller than the reactive compensation signal delta A, the energy storage system uses the reactive signal upper limit value B1 to perform reactive voltage compensation on the power grid;
when C1 is smaller than C0 and the upper limit value B1 of the reactive signal is larger than the reactive compensation signal delta A, the energy storage system uses the reactive voltage of delta A (C1/C0) to compensate the power grid;
When C1 is less than C0 and the reactive upper limit B1 is less than the reactive compensation signal Δa, the energy storage system compensates the grid with a reactive voltage of B1 x (C1/C0).
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