CN116979561A - Judgment method and system for wind power and energy storage to actively participate in regulation of power system - Google Patents
Judgment method and system for wind power and energy storage to actively participate in regulation of power system 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
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
- H02J3/241—The oscillation concerning frequency
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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
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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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
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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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/48—Controlling the sharing of the in-phase component
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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
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
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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
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/28—The renewable source being wind energy
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Abstract
The invention discloses a judging method for actively participating in regulation of a power system by wind power and energy storage, which comprises the steps of acquiring data information of a target power system; calculating the frequency change rate of the target power system before and after the new energy is accessed; calculating the virtual inertia difference value and the inertia time constant variation of the target power system before and after the fan is cut off; calculating the system frequency change rate of the target power system in the process of cutting off the fan and taking the energy storage into consideration for regulation; and calculating transient frequency indexes of the wind power active support and frequency change rate evaluation indexes when disturbance occurs, and completing judgment of wind power and energy storage active participation in regulation of a target power system. The invention also discloses a system for realizing the judging method of actively participating in the regulation of the power system by wind power and energy storage. The invention can scientifically provide theoretical analysis for safe and stable operation of the system, is favorable for frequency recovery of the system, and has high reliability, good accuracy and objectivity and science.
Description
Technical Field
The invention belongs to the field of electric automation, and particularly relates to a judging method and a judging system for wind power and energy storage actively participating in regulation of a power system.
Background
Along with the development of economic technology and the improvement of living standard of people, electric energy becomes an indispensable secondary energy source for the production and living of people, and brings endless convenience for the production and living of people. Therefore, ensuring stable and reliable supply of electric energy becomes one of the most important tasks of the electric power system.
At present, along with the increasing serious environmental problems, more and more new energy power generation systems start to be integrated into a power grid system and generate power; meanwhile, in future medium-and-long-term planning, more new energy power generation systems are integrated into the power grid system. However, the randomness and instability of the new energy power generation system are amplified, the new energy power electronic equipment is electrically decoupled from the system frequency, and after intermittent and random power is injected into the power grid in a large scale, a more severe operation environment is brought to the power system.
In a high-proportion new energy power system, both the rotational kinetic energy of a fan and the stored energy of stored energy can be regarded as energy stored energy made of system inertia, so that the rapid power response capability of the fan and the stored energy is utilized to cooperatively support the frequency of the power system. However, there is currently no effective and reliable assessment means to determine the ability of wind power and energy storage to actively participate in the regulation of the power system.
Disclosure of Invention
The invention aims to provide a judging method for actively participating wind power and energy storage in power system regulation, which has high reliability, good accuracy and objectivity and science.
The second purpose of the invention is to provide a system for realizing the judging method of actively participating in the regulation of the power system by wind power and energy storage.
The judging method for actively participating in the regulation of the power system by wind power and energy storage provided by the invention comprises the following steps:
s1, acquiring data information of a target power system;
s2, calculating the frequency change rate of the target power system before and after the new energy is accessed according to the data information obtained in the step S1;
s3, calculating a virtual inertia difference value and an inertia time constant variation of the target power system before and after the fan is cut off according to the data information obtained in the step S2;
s4, calculating the system frequency change rate of the target power system when the fan is cut off and the energy storage is considered to participate in adjustment according to the data information obtained in the step S3;
s5, calculating a wind power active support transient frequency index and a frequency change rate evaluation index when disturbance occurs according to the data obtained in the steps S2 to S4 aiming at a target power system;
s6, according to the wind power active support transient frequency index and the frequency change rate evaluation index when disturbance occurs, which are obtained in the step S5, judging that wind power and energy storage actively participate in regulation of a target power system is completed.
The step S2 of calculating the frequency change rate of the target power system before and after the new energy is accessed according to the data information obtained in the step S1 specifically includes the following steps:
calculating an inertia time constant H of the target power system when no new energy is accessed by adopting the following formula 0 ：
S in i The rated capacity of the ith conventional unit; h i The inertia time constant of the ith conventional unit; n is the number of conventional units in the target power system; s is S N The sum of rated capacities of conventional units in the target power system;
the inertial time constant H of the target power system after the new energy is accessed is calculated by adopting the following formula:
H＝H 0 (1-η)
wherein eta is the permeability of new energyS RES The capacity of new energy for accessing the target power system;
setting the disturbance power of the target power system as delta P, and calculating to obtain the frequency change rate of the target power system at the disturbance occurrence timeIs->
And step S3, calculating the virtual inertia difference and the inertia time constant variation of the target power system before and after the fan is cut off according to the data information obtained in the step S2, wherein the method specifically comprises the following steps of:
when the target power system is disturbed, the inertia time constant H' of the target power system is calculated by adopting the following formula after the wind turbine generator which does not participate in the system frequency adjustment is cut off:
wherein delta S is the capacity of the excised wind turbine generator which does not participate in system frequency adjustment;
calculating to obtain the inertia time constant variation delta H of the target power system before and after cutting off the wind turbine generator set as
Calculating virtual inertia H provided by wind turbine generator set when wind turbine generator set is not cut off by adopting the following formula virtual ：
K in the formula virtual Controlling a proportion parameter for virtual inertia of the wind turbine generator;
after the partial wind turbine generator is calculated and cut off, virtual inertia H 'provided by the remaining wind turbine generator is calculated' virtual Is that
After cutting off wind turbine generators which do not participate in system frequency adjustment and providing virtual inertia support by considering the wind turbine generators, calculating the inertia time constant variation delta H of a target power system system Is that
After considering cutting off wind turbine generator sets which do not participate in system frequency adjustment and considering the wind turbine generator sets to provide virtual inertia support, calculating a targetIncreased power deficit Δp of power system RES Is delta P RES =Δsλ, λ is the output timing rate of the wind turbine.
And step S4, calculating the system frequency change rate of the target power system when the fan is cut off and the energy storage is considered to participate in adjustment according to the data information obtained in the step S3, wherein the method specifically comprises the following steps of:
consider reducing a power deficit of a target system by storing energy; the following equation is used as the energy storage capacity constraint:
ΔSλ≤S ESS ≤αS RES
s in ESS Configuring a capacity for energy storage of a target power system; alpha is the proportion of the required energy storage configuration capacity to the new energy capacity of the target power system;
energy storage virtual inertia support H of target power system is obtained through calculation by adopting the following formula ESS ：
K in the formula ESS Controlling a proportionality coefficient for the energy storage virtual inertia;
after active power disturbance occurs in the target power system, cutting off wind turbine generators which do not participate in system frequency adjustment, and calculating to obtain an inertia time constant H of the target power system under the condition that energy storage participates in transient response of the system system Is H system ＝H+ΔH+ΔH virtual +H ESS ；
The power deficiency delta P of the target power system after the wind turbine generator which does not participate in system frequency adjustment is cut off is calculated by adopting the following formula system ：
ΔP system ＝ΔP+ΔP RES +P ESS
P in the formula ESS Is energy storage discharge power and P ESS ＝μS ESS μ is the energy storage discharge rate;
calculating to obtain the system frequency change rate taking into account the energy storage participation regulation after cutting off the fans which do not participate in the system frequency regulationIs->
The step S5 of calculating the transient frequency index of the wind power active support specifically comprises the following steps:
the transient frequency index beta of the wind power active support is calculated by adopting the following formula:
in f' nadir The method comprises the steps of cutting off a wind turbine generator set which does not participate in system frequency adjustment and considering the system transient minimum point frequency when energy storage participates in transient response; f (f) nadir The transient minimum point frequency under the condition of disturbance of a target power system when the wind turbine generator is not cut off; f (f) cr Controlling a first wheel operating frequency threshold for low frequency load shedding;
aiming at the wind power active support transient frequency index beta, the following judgment is carried out:
if f nadir -f cr If more than 0 and beta is more than 0, the wind power actively participates in regulation to play a supporting role;
if f nadir -f cr If more than 0 and beta is less than or equal to 0, the wind power actively participates in regulation and has no supporting effect;
if f nadir -f cr If the beta is less than 0 and less than 0, the wind power actively participates in regulation to play a supporting role;
if f nadir -f cr And if the beta is less than 0 and more than or equal to 0, the wind power actively participates in regulation and has no supporting effect.
The step S5 of calculating the evaluation index of the frequency change rate when disturbance occurs specifically comprises the following steps:
the wind turbine generator set which is not involved in system frequency regulation is cut off and cut off by adopting the following formula, and when energy storage is considered to participate in transient response, the evaluation index delta of the frequency change rate when disturbance occurs is calculated:
in the middle ofThe frequency change rate of the system when the fan is not cut off;
the following determination is made with respect to the frequency change rate evaluation index δ when disturbance occurs:
if it isAnd delta is more than 1, the wind power actively participates in regulation to play a supporting role;
if it isDelta is less than or equal to 1, and the wind power actively participates in regulation and has no supporting effect;
if it isDelta is less than 1, and the wind power actively participates in regulation to play a supporting role;
if it isAnd delta is more than or equal to 1, the wind power actively participates in regulation and has no supporting effect.
And step S6, according to the wind power active support transient frequency index and the frequency change rate evaluation index when disturbance occurs, which are obtained in the step S5, the judgment of wind power and energy storage active participation target power system adjustment is completed, and the method specifically comprises the following steps:
when the wind turbine generator is not cut off and the frequency change and the transient minimum frequency of the system when disturbance occurs meet constraint conditions, if beta is more than 0 and delta is more than 1, the cut-off wind turbine generator has supporting effect on the frequency change rate and the transient frequency of the system when disturbance occurs; under other conditions, the cut-off wind turbine generator system has no supporting effect on system adjustment.
When the wind turbine generator is not cut off and the frequency change and the transient minimum frequency of the system are not satisfied with constraint conditions, if beta is smaller than 0 and delta is smaller than 1, the cut-off wind turbine generator has supporting effect on the frequency change rate and the transient frequency of the system when the disturbance occurs; under other conditions, the cut-off wind turbine generator system has no supporting effect on system adjustment.
The invention also provides a system for realizing the judging method of actively participating in the regulation of the power system by wind power and energy storage, which comprises a data acquisition module, a frequency change rate calculation module, an inertia calculation module, a regulation frequency change rate calculation module, an index calculation module and a judging module; the data acquisition module, the frequency change rate calculation module, the inertia calculation module, the frequency change rate adjustment calculation module, the index calculation module and the judgment module are sequentially connected in series; the data acquisition module is used for acquiring data information of the target power system and uploading the data to the frequency change rate calculation module; the frequency change rate calculation module is used for calculating the frequency change rate of the target power system before and after the new energy is accessed according to the received data, and uploading the data to the inertia calculation module; the inertia calculation module is used for calculating virtual inertia difference values and inertia time constant variation of the target power system before and after the fan is cut off according to the received data, and uploading the data to the frequency variation rate calculation module; the adjusting frequency change rate calculation module is used for calculating the system frequency change rate of the target power system in the process of cutting off fans and taking energy storage into consideration for adjustment according to the received data, and uploading the data to the index calculation module; the index calculation module is used for calculating a transient frequency index of the wind power active support and a frequency change rate evaluation index when disturbance occurs according to the received data and aiming at a target power system, and uploading the data to the judgment module; and the judging module is used for completing judgment of wind power and energy storage actively participating in regulation of the target power system according to the received data.
According to the judging method and system for actively participating in power system regulation of wind power and energy storage, firstly, the inertia time constant of a system after new energy is accessed is analyzed, the disturbance moment of the system is considered, the permeability of the new energy of the system is changed by cutting off part of wind turbines, and then the inertia of the system is changed; then analyzing the supporting condition of the system inertia by the system under the control of the virtual inertia before and after the wind turbine is cut off, and further obtaining the inertia time constant of the whole system before and after the wind turbine is cut off; based on the fact that active power of a system is increased after a wind turbine generator is cut off, the new energy output synchronous rate, the new energy proportionality coefficient of an energy storage capacity station system and the energy storage discharge conversion efficiency are considered, and virtual inertia support is further provided for the system while power shortage is reduced through energy storage cooperative control; finally, a transient frequency index of wind power active support and a frequency change rate evaluation index at the disturbance moment are provided to judge the influence and the effect of wind power and energy storage on the system frequency after the wind power and the energy storage actively participate in the system adjustment; therefore, the invention has high reliability, good accuracy and objectivity and science.
Drawings
FIG. 1 is a schematic flow chart of the method of the present invention.
Fig. 2 is a schematic diagram of an IEEE 30 node system according to an embodiment of the method of the present invention.
FIG. 3 is a schematic diagram of a system frequency response characteristic when wind power participates in system frequency adjustment according to an embodiment of the method of the present invention.
Fig. 4 is a schematic diagram of frequency response characteristics of a system before and after a fan is cut off according to an embodiment of the method.
FIG. 5 is a schematic diagram of functional modules of the system of the present invention.
Detailed Description
A schematic process flow diagram of the method of the present invention is shown in fig. 1: the invention discloses a judging method for actively participating in regulation of a power system by wind power and energy storage, which comprises the following steps:
s1, acquiring data information of a target power system;
s2, calculating the frequency change rate of the target power system before and after the new energy is accessed according to the data information obtained in the step S1; the method specifically comprises the following steps:
calculating an inertia time constant H of the target power system when no new energy is accessed by adopting the following formula 0 ：
S in i The rated capacity of the ith conventional unit; h i The inertia time constant of the ith conventional unit; n is the number of conventional units in the target power system; s is S N The sum of rated capacities of conventional units in the target power system;
the inertial time constant H of the target power system after the new energy is accessed is calculated by adopting the following formula:
H＝H 0 (1-η)
wherein eta is the permeability of new energyS RES The capacity of new energy for accessing the target power system;
setting the disturbance power of the target power system as delta P, and calculating to obtain the frequency change rate of the target power system at the disturbance occurrence timeIs->
S3, calculating a virtual inertia difference value and an inertia time constant variation of the target power system before and after the fan is cut off according to the data information obtained in the step S2; the method specifically comprises the following steps:
in a normal case, a wind turbine generator set which does not participate in system frequency adjustment exists in the system, and transient frequency response of the system cannot be controlled to participate through droop control, virtual inertia and the like; therefore, when the system is disturbed, partial wind turbines can be considered to be cut off, and then the equivalent inertia time constant of the new energy permeability increasing system is changed; when the target power system is disturbed, the inertia time constant H' of the target power system is calculated by adopting the following formula after the wind turbine generator which does not participate in the system frequency adjustment is cut off:
wherein delta S is the capacity of the excised wind turbine generator which does not participate in system frequency adjustment;
calculating to obtain the inertia time constant variation delta H of the target power system before and after cutting off the wind turbine generator set asAfter part of the wind turbine generator is cut off, the inertia time constant of the system is increased;
normally, the wind turbine generator participates in transient frequency response of the system, and the transient frequency response of the supporting system is controlled through virtual inertia to provide inertia support; calculating virtual inertia H provided by wind turbine generator set when wind turbine generator set is not cut off by adopting the following formula virtual ：
K in the formula virtual Controlling a proportion parameter for virtual inertia of the wind turbine generator;
after the partial wind turbine generator is calculated and cut off, virtual inertia H 'provided by the remaining wind turbine generator is calculated' virtual Is that
After cutting off wind turbine generators which do not participate in system frequency adjustment and providing virtual inertia support by considering the wind turbine generators, calculating the inertia time constant variation delta H of a target power system system Is that
Because the new energy output can be reduced when part of wind turbine generators are cut off, the active power shortage of the system is increased, and the method is characterized in thatThe system inertia time constant is increased by cutting off part of the wind turbine generator without considering the virtual inertia support of the wind turbine generator, but the frequency change rate of the system at the disturbance occurrence moment is still possibly overlarge due to the increase of the system power shortage; after considering cutting off wind turbine generator sets which do not participate in system frequency adjustment and considering the wind turbine generator sets to provide virtual inertia support, calculating the power deficiency delta P increased by the target power system RES Is delta P RES =Δsλ, λ is the output timing rate of the wind turbine;
s4, calculating the system frequency change rate of the target power system when the fan is cut off and the energy storage is considered to participate in adjustment according to the data information obtained in the step S3; the method specifically comprises the following steps:
consider reducing a power deficit of a target system by storing energy; the following equation is used as the energy storage capacity constraint:
ΔSλ≤S ESS ≤αS RES
s in ESS Configuring a capacity for energy storage of a target power system; alpha is the proportion of the required energy storage configuration capacity to the new energy capacity of the target power system;
in the operation of the power system, energy storage responds to system disturbance according to the power grid demand, active power is increased in the transient process, and meanwhile, the system inertia can be supported through virtual inertia control; energy storage virtual inertia support H of target power system is obtained through calculation by adopting the following formula ESS ：
K in the formula ESS Controlling a proportionality coefficient for the energy storage virtual inertia;
after active power disturbance occurs in the target power system, cutting off wind turbine generators which do not participate in system frequency adjustment, and calculating to obtain an inertia time constant H of the target power system under the condition that energy storage participates in transient response of the system system Is H system ＝H+ΔH+ΔH virtual +H ESS ；
To ensure the safety of transient frequency of the system, wind is removedThe motor group considers the transient response of the energy storage participation system, and the lowest point frequency is not lower than the threshold value of the low-frequency load shedding control first wheel operating frequency of the system; analyzing the active supporting function of the wind turbine generator, and calculating to obtain the power deficiency delta P of the target power system after cutting off the wind turbine generator which does not participate in system frequency adjustment by adopting the following formula system ：
ΔP system ＝ΔP+ΔP RES +P ESS
P in the formula ESS Is energy storage discharge power and P ESS ＝μS ESS μ is the energy storage discharge rate;
calculating to obtain the system frequency change rate taking into account the energy storage participation regulation after cutting off the fans which do not participate in the system frequency regulationIs->
S5, calculating a wind power active support transient frequency index and a frequency change rate evaluation index when disturbance occurs according to the data obtained in the steps S2 to S4 aiming at a target power system;
the method for calculating the transient frequency index of the wind power active support specifically comprises the following steps:
the transient frequency index beta of the wind power active support is calculated by adopting the following formula:
in f' nadir The method comprises the steps of cutting off a wind turbine generator set which does not participate in system frequency adjustment and considering the system transient minimum point frequency when energy storage participates in transient response; f (f) nadir The transient minimum point frequency under the condition of disturbance of a target power system when the wind turbine generator is not cut off; f (f) cr Controlling a first wheel operating frequency threshold for low frequency load shedding;
aiming at the wind power active support transient frequency index beta, the following judgment is carried out:
if f nadir -f cr If more than 0 and beta is more than 0, the wind power actively participates in regulation to play a supporting role;
if f nadir -f cr If more than 0 and beta is less than or equal to 0, the wind power actively participates in regulation and has no supporting effect;
if f nadir -f cr If the beta is less than 0 and less than 0, the wind power actively participates in regulation to play a supporting role;
if f nadir -f cr If the beta is less than 0 and more than or equal to 0, the wind power actively participates in regulation and has no supporting effect;
the method for calculating the frequency change rate evaluation index when disturbance occurs specifically comprises the following steps:
the wind turbine generator set which is not involved in system frequency regulation is cut off and cut off by adopting the following formula, and when energy storage is considered to participate in transient response, the evaluation index delta of the frequency change rate when disturbance occurs is calculated:
in the middle ofThe frequency change rate of the system when the fan is not cut off;
the following determination is made with respect to the frequency change rate evaluation index δ when disturbance occurs:
if it isAnd delta is more than 1, the wind power actively participates in regulation to play a supporting role;
if it isDelta is less than or equal to 1, and the wind power actively participates in regulation and has no supporting effect;
if it isAnd delta is less than 1,the wind power actively participates in regulation to play a supporting role;
if it isAnd delta is more than or equal to 1, the wind power actively participates in regulation and has no supporting effect;
s6, according to the wind power active support transient frequency index and the frequency change rate evaluation index when disturbance occurs, which are obtained in the step S5, judging that wind power and energy storage actively participate in regulation of a target power system is completed; the method specifically comprises the following steps:
when the wind turbine generator is not cut off and the frequency change and the transient minimum frequency of the system when disturbance occurs meet constraint conditions, if beta is more than 0 and delta is more than 1, the cut-off wind turbine generator has supporting effect on the frequency change rate and the transient frequency of the system when disturbance occurs; under other conditions, the cut-off wind turbine generator system has no supporting effect on system adjustment.
When the wind turbine generator is not cut off and the frequency change and the transient minimum frequency of the system are not satisfied with constraint conditions, if beta is smaller than 0 and delta is smaller than 1, the cut-off wind turbine generator has supporting effect on the frequency change rate and the transient frequency of the system when the disturbance occurs; under other conditions, the cut-off wind turbine generator system has no supporting effect on system adjustment.
The method of the invention is further described in connection with one embodiment as follows:
analysis was performed using an IEEE 30 node system as an example (as shown in FIG. 2), with an inertial time constant of H 0 =6.5 s. After the wind turbine generator is connected, the rated capacity of a conventional power supply is 425MW, the rated capacity of the wind turbine generator is 100MW, and the energy storage configuration capacity of the system is 12MW. The new energy permeability is η=0.235, and the system inertia time constant h=4.97 s. The new energy output of the system is 50MW, and the new energy output simultaneously has the interest rate of lambda=0.5.
Setting system disturbance, wherein the ΔP=45 MW wind turbine generator participates in system adjustment through droop control and virtual inertia control, and the frequency response characteristic of the system is shown in figure 3;
at the moment, the inertial support provided by the wind turbine generator set is H virtual =1.17 s, the inertial time constant that the system exhibits during transients is 6.11s. The calculated system frequency change rate is as follows:the lowest frequency of transient frequency of the system is 49.48Hz. The system frequency change rate obtained by calculation of the actual curve is 0.43Hz/s, and the system inertia time constant is 6.108s. The simulation result is consistent with the theoretical calculation result.
When disturbance occurs, the 20MW wind turbine generator is cut off, and the active power disturbance of the system after energy storage participation adjustment is considered to be delta P system ＝ΔP+ΔP RES +P ESS =45 MW. The new energy permeability is eta ' =0.198, the system inertia time constant is H ' =5.21 s, and the inertia support provided by the wind turbine generator is H ' virtual =0.987 s. After considering the energy storage to participate in transient regulation, the energy storage inertia is supported as H ESS =0.3 s. The inertia time constant of the system in transient process is H system = 6.497s, the frequency change rate is 0.4Hz/s, and the system transient frequency nadir is 49.495Hz. According to the calculation and analysis of the simulation curve (shown in fig. 4), the change rate of the system frequency is 0.41Hz/s, the inertia time constant in the transient process of the system is 6.48s, and the system frequency is basically consistent with the theoretical calculation value.
According to the published standard of China, the frequency deviation of the power system in an abnormal state is regulated to be not more than 1Hz, and f is taken cr ＝49.25Hz。
Therefore, the transient frequency index and the frequency change rate evaluation index of the wind power active support are as follows:
according to the calculation result, when part of wind turbines is actively cut off and energy storage is considered to participate in system adjustment, inertia of the system can be effectively supported, and the system frequency change rate can be improved.
The invention can scientifically provide theoretical analysis for safe and stable operation of the system, and proposes that wind power and energy storage actively participate in a system regulation control strategy under the disturbance condition, thereby improving the inertia of the system in the transient process and being beneficial to the recovery of the system frequency.
FIG. 5 is a schematic diagram of functional modules of the system of the present invention: the system for realizing the judging method for actively participating in the regulation of the power system by wind power and energy storage comprises a data acquisition module, a frequency change rate calculation module, an inertia calculation module, a regulation frequency change rate calculation module, an index calculation module and a judging module; the data acquisition module, the frequency change rate calculation module, the inertia calculation module, the frequency change rate adjustment calculation module, the index calculation module and the judgment module are sequentially connected in series; the data acquisition module is used for acquiring data information of the target power system and uploading the data to the frequency change rate calculation module; the frequency change rate calculation module is used for calculating the frequency change rate of the target power system before and after the new energy is accessed according to the received data, and uploading the data to the inertia calculation module; the inertia calculation module is used for calculating virtual inertia difference values and inertia time constant variation of the target power system before and after the fan is cut off according to the received data, and uploading the data to the frequency variation rate calculation module; the adjusting frequency change rate calculation module is used for calculating the system frequency change rate of the target power system in the process of cutting off fans and taking energy storage into consideration for adjustment according to the received data, and uploading the data to the index calculation module; the index calculation module is used for calculating a transient frequency index of the wind power active support and a frequency change rate evaluation index when disturbance occurs according to the received data and aiming at a target power system, and uploading the data to the judgment module; and the judging module is used for completing judgment of wind power and energy storage actively participating in regulation of the target power system according to the received data.
Claims (8)
1. A judging method for actively participating in regulation of a power system by wind power and energy storage comprises the following steps:
s1, acquiring data information of a target power system;
s2, calculating the frequency change rate of the target power system before and after the new energy is accessed according to the data information obtained in the step S1;
s3, calculating a virtual inertia difference value and an inertia time constant variation of the target power system before and after the fan is cut off according to the data information obtained in the step S2;
s4, calculating the system frequency change rate of the target power system when the fan is cut off and the energy storage is considered to participate in adjustment according to the data information obtained in the step S3;
s5, calculating a wind power active support transient frequency index and a frequency change rate evaluation index when disturbance occurs according to the data obtained in the steps S2 to S4 aiming at a target power system;
s6, according to the wind power active support transient frequency index and the frequency change rate evaluation index when disturbance occurs, which are obtained in the step S5, judging that wind power and energy storage actively participate in regulation of a target power system is completed.
2. The method for determining whether wind power and energy storage actively participate in power system regulation according to claim 1, wherein the step S2 is characterized in that the frequency change rate of the target power system before and after the new energy is accessed is calculated according to the data information obtained in the step S1, and specifically comprises the following steps:
calculating an inertia time constant H of the target power system when no new energy is accessed by adopting the following formula 0 ：
S in i The rated capacity of the ith conventional unit; h i The inertia time constant of the ith conventional unit; n is the number of conventional units in the target power system; s is S N The sum of rated capacities of conventional units in the target power system;
the inertial time constant H of the target power system after the new energy is accessed is calculated by adopting the following formula:
H＝H 0 (1-η)
wherein eta is the permeability of new energyS RES The capacity of new energy for accessing the target power system;
setting the disturbance power of the target power system as delta P, and calculating to obtain the frequency change rate of the target power system at the disturbance occurrence timeIs->
3. The method for determining the wind power and energy storage active participation power system regulation according to claim 2, wherein the data information obtained in step S2 in step S3 is used for calculating the virtual inertia difference and the inertia time constant variation of the target power system before and after the fan is cut off, and specifically comprises the following steps:
when the target power system is disturbed, the inertia time constant H' of the target power system is calculated by adopting the following formula after the wind turbine generator which does not participate in the system frequency adjustment is cut off:
wherein delta S is the capacity of the excised wind turbine generator which does not participate in system frequency adjustment;
calculating to obtain the inertia time constant variation delta H of the target power system before and after cutting off the wind turbine generator set as
Calculating virtual inertia H provided by wind turbine generator set when wind turbine generator set is not cut off by adopting the following formula virtual ：
K in the formula virtual Controlling a proportion parameter for virtual inertia of the wind turbine generator;
after the partial wind turbine generator is calculated and cut off, virtual inertia H 'provided by the remaining wind turbine generator is calculated' virtual Is that
After cutting off wind turbine generators which do not participate in system frequency adjustment and providing virtual inertia support by considering the wind turbine generators, calculating the inertia time constant variation delta H of a target power system system Is that
After considering cutting off wind turbine generator sets which do not participate in system frequency adjustment and considering the wind turbine generator sets to provide virtual inertia support, calculating the power deficiency delta P increased by the target power system RES Is delta P RES =Δsλ, λ is the output timing rate of the wind turbine.
4. The method for determining whether wind power and energy storage actively participate in power system regulation according to claim 3, wherein the step S4 is based on the data information obtained in step S3, and the step of calculating the system frequency change rate of the target power system in which the wind power and energy storage participate in regulation is performed by cutting off the wind power and considering the wind power and the energy storage, specifically comprises the following steps:
consider reducing a power deficit of a target system by storing energy; the following equation is used as the energy storage capacity constraint:
ΔSλ≤S ESS ≤αS RES
s in ESS Configuring a capacity for energy storage of a target power system; alpha is the proportion of the required energy storage configuration capacity to the new energy capacity of the target power system;
the target electricity is calculated by the following formulaEnergy storage virtual inertia support H of force system ESS ：
K in the formula ESS Controlling a proportionality coefficient for the energy storage virtual inertia;
after active power disturbance occurs in the target power system, cutting off wind turbine generators which do not participate in system frequency adjustment, and calculating to obtain an inertia time constant H of the target power system under the condition that energy storage participates in transient response of the system system Is H system ＝H+ΔH+ΔH virtual +H ESS ；
The power deficiency delta P of the target power system after the wind turbine generator which does not participate in system frequency adjustment is cut off is calculated by adopting the following formula system ：
ΔP system ＝ΔP+ΔP RES +P ESS
P in the formula ESS Is energy storage discharge power and P ESS ＝μS ESS μ is the energy storage discharge rate;
calculating to obtain the system frequency change rate taking into account the energy storage participation regulation after cutting off the fans which do not participate in the system frequency regulationIs->
5. The method for determining whether wind power and energy storage actively participate in power system regulation according to claim 4, wherein the step S5 of calculating the transient frequency index of wind power active support specifically comprises the following steps:
the transient frequency index beta of the wind power active support is calculated by adopting the following formula:
in f' nadir The method comprises the steps of cutting off a wind turbine generator set which does not participate in system frequency adjustment and considering the system transient minimum point frequency when energy storage participates in transient response; f (f) nadir The transient minimum point frequency under the condition of disturbance of a target power system when the wind turbine generator is not cut off; f (f) cr Controlling a first wheel operating frequency threshold for low frequency load shedding;
aiming at the wind power active support transient frequency index beta, the following judgment is carried out:
if f nadir -f cr If more than 0 and beta is more than 0, the wind power actively participates in regulation to play a supporting role;
if f nadir -f cr If more than 0 and beta is less than or equal to 0, the wind power actively participates in regulation and has no supporting effect;
if f nadir -f cr If the beta is less than 0 and less than 0, the wind power actively participates in regulation to play a supporting role;
if f nadir -f cr And if the beta is less than 0 and more than or equal to 0, the wind power actively participates in regulation and has no supporting effect.
6. The method for determining whether wind power and energy storage actively participate in power system regulation according to claim 5, wherein the step S5 is to calculate the evaluation index of the rate of change of frequency when disturbance occurs, and specifically comprises the following steps:
the wind turbine generator set which is not involved in system frequency regulation is cut off and cut off by adopting the following formula, and when energy storage is considered to participate in transient response, the evaluation index delta of the frequency change rate when disturbance occurs is calculated:
in the middle ofThe frequency change rate of the system when the fan is not cut off;
the following determination is made with respect to the frequency change rate evaluation index δ when disturbance occurs:
if it isAnd delta is more than 1, the wind power actively participates in regulation to play a supporting role;
if it isDelta is less than or equal to 1, and the wind power actively participates in regulation and has no supporting effect;
if it isDelta is less than 1, and the wind power actively participates in regulation to play a supporting role;
if it isAnd delta is more than or equal to 1, the wind power actively participates in regulation and has no supporting effect.
7. The method for determining the wind power and energy storage active participation power system regulation according to claim 6, wherein the determining of the wind power and energy storage active participation target power system regulation is completed according to the wind power active support transient frequency index and the frequency change rate evaluation index obtained in step S5 in step S6, specifically comprising the following steps:
when the wind turbine generator is not cut off and the frequency change and the transient minimum frequency of the system when disturbance occurs meet constraint conditions, if beta is more than 0 and delta is more than 1, the cut-off wind turbine generator has supporting effect on the frequency change rate and the transient frequency of the system when disturbance occurs; under other conditions, the cut-off wind turbine generator system has no supporting effect on system adjustment.
When the wind turbine generator is not cut off and the frequency change and the transient minimum frequency of the system are not satisfied with constraint conditions, if beta is smaller than 0 and delta is smaller than 1, the cut-off wind turbine generator has supporting effect on the frequency change rate and the transient frequency of the system when the disturbance occurs; under other conditions, the cut-off wind turbine generator system has no supporting effect on system adjustment.
8. A system for realizing the judging method of the wind power and energy storage active participation power system regulation according to one of claims 1 to 7, which is characterized by comprising a data acquisition module, a frequency change rate calculation module, an inertia calculation module, a regulation frequency change rate calculation module, an index calculation module and a judging module; the data acquisition module, the frequency change rate calculation module, the inertia calculation module, the frequency change rate adjustment calculation module, the index calculation module and the judgment module are sequentially connected in series; the data acquisition module is used for acquiring data information of the target power system and uploading the data to the frequency change rate calculation module; the frequency change rate calculation module is used for calculating the frequency change rate of the target power system before and after the new energy is accessed according to the received data, and uploading the data to the inertia calculation module; the inertia calculation module is used for calculating virtual inertia difference values and inertia time constant variation of the target power system before and after the fan is cut off according to the received data, and uploading the data to the frequency variation rate calculation module; the adjusting frequency change rate calculation module is used for calculating the system frequency change rate of the target power system in the process of cutting off fans and taking energy storage into consideration for adjustment according to the received data, and uploading the data to the index calculation module; the index calculation module is used for calculating a transient frequency index of the wind power active support and a frequency change rate evaluation index when disturbance occurs according to the received data and aiming at a target power system, and uploading the data to the judgment module; and the judging module is used for completing judgment of wind power and energy storage actively participating in regulation of the target power system according to the received data.
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