Method and system for identifying effective period of short-circuit current control measures of new energy unit
By identifying the grid operation mode and adjusting the parameters of new energy units, the problem of short-circuit current control in the future period was solved, an effective control parameter scheme was provided, and efficient limitation of grid short-circuit current was achieved.
Patent Information
- Application Number
- CN202411938556.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-26
- Publication Date
- 2025-12-09
- Estimated Expiration
- 2044-12-26
AI Technical Summary
There is a lack of effective methods in the existing technology to identify technical problems that can be addressed by adjusting the control parameters of new energy units to limit short-circuit current in future periods.
By acquiring multiple operating modes of the power grid during the future target period, the operating modes with bus short-circuit current exceeding the safety standard are screened out. The electrical distance between the new energy generating units and the bus and the short-circuit current sensitivity are calculated. The overcurrent coefficient and set current multiple of the new energy generating units are adjusted to generate candidate limiting measures. The effective limiting period and parameter adjustment range are determined through simulation verification.
It identifies which periods in the future can be limited by adjusting the control parameters of new energy generating units to limit short-circuit current, and provides corresponding control parameter adjustment schemes to achieve efficient and convenient grid short-circuit current limiting.
Smart Images
Figure CN119805092B_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of power grid control, and particularly relates to a new energy unit short-circuit current control measure effective period identification method and system. BACKGROUND
[0002] With the acceleration of the construction of new power systems, the grid-connected capacity of new energy units is increasing. During a fault, new energy units will provide short-circuit current, and provide reactive power through the short-circuit current, thereby supporting the voltage at the grid connection point. The short-circuit current provided by the new energy unit includes an active current component and a reactive current component. The reactive current component is close in phase to the short-circuit current component of the grid-connected alternating current system, and has a significant impact on the short-circuit current at the fault point. The key control parameters that affect the reactive current component of the new energy unit include the overcurrent coefficient and the fixed current multiple. Therefore, the short-circuit current can be limited by adjusting the control parameters of the new energy unit.
[0003] Conventional short-circuit current control measures have a large impact on the power grid but have a significant short-circuit current control effect. New energy unit short-circuit current control measures have a small impact on the power grid but have a small short-circuit current control capability. Therefore, for a small short-circuit current, the short-circuit current is limited by adjusting the control parameters of the new energy unit. For a large short-circuit current, the short-circuit current is limited by a control measure that combines conventional short-circuit current control measures and new energy unit parameter adjustment. Some conventional measures require a dispatch plan to be prepared in advance. Therefore, it is necessary to identify which time periods in the future can limit the short-circuit current by adjusting the control parameters of the new energy unit, and which time periods require a control measure that combines conventional short-circuit current control measures and new energy unit control parameter adjustment, so as to provide technical support for dispatch and operation personnel to plan conventional measures in advance.
[0004] However, there is currently little research on how to identify which time periods in the future can limit the short-circuit current by adjusting the control parameters of the new energy unit. SUMMARY
[0005] The present application provides a new energy unit short-circuit current control measure effective period identification method and system, which aims to solve the technical problem that there is no effective method to identify which time periods in the future can limit the short-circuit current by adjusting the control parameters of the new energy unit in the prior art.
[0006] Technical solution: The application provides a new energy unit short-circuit current control measure effective period identification method, which comprises the following steps: obtaining multiple operation modes of a power grid in a future target period; calibrating the short-circuit current of a bus in the power grid in each operation mode, and screening out an operation mode in which the short-circuit current of the bus in the target period is higher than a safety standard, and taking the screened operation mode as a to-be-controlled mode; for the to-be-controlled mode, screening corresponding effective new energy units to obtain an effective new energy unit set; performing a restriction measure generation step on the effective new energy unit set to obtain multiple candidate restriction measures corresponding to the effective new energy unit set; performing an identification step on the to-be-controlled mode to determine the parameter adjustment range of the effective new energy unit set and the effective restriction period; within the parameter adjustment range of the effective new energy unit set, performing the restriction measure generation step again to obtain multiple candidate restriction measures corresponding to the effective new energy unit set again, and performing the identification step until all the to-be-controlled modes are identified; combining all the effective restriction periods determined in the identification step to obtain all the effective periods of the new energy unit short-circuit current control measure in the target period and the corresponding candidate restriction measures.
[0007] Specifically, the electrical distance between the new energy unit and the bus with the short-circuit current higher than the safety standard is calculated, and the new energy unit with the electrical distance less than a standard distance is screened as a candidate new energy unit; the short-circuit current sensitivity of the candidate new energy unit to the short-circuit current of the bus with the short-circuit current higher than the safety standard is calculated, and the candidate new energy unit with the short-circuit current sensitivity higher than a corresponding sensitivity threshold is screened as an effective new energy unit; the short-circuit current sensitivity comprises an overcurrent coefficient sensitivity and a constant current multiple sensitivity.
[0008] Specifically, the overcurrent coefficient sensitivity is calculated by the following formula:
[0009] ΔI j i,k =I j (k i +Δk,I i,qmax )-I j (k i ,I i,qmax ),
[0010] Wherein, ΔI j i,k represents the overcurrent coefficient sensitivity of the i th new energy unit to the overcurrent coefficient of the j th bus, I j (k i +Δk,I i,qmax ) represents the short-circuit current of the j th bus after the overcurrent coefficient perturbation, I j (k i ,I i,qmax ) represents the short-circuit current of the j th bus before the perturbation, k i(k, I) represents the overcurrent coefficient of the i-th new energy unit, Δk represents the overcurrent coefficient perturbation step, I i,qmax (k, I) represents the overcurrent coefficient of the i-th new energy unit, Δk represents the overcurrent coefficient perturbation step, I
[0011] Specifically, the fixed value current multiple sensitivity is calculated by the following formula:
[0012] ΔI j i,q = I j (k i ,I i,qmax + ΔI i,qmax ) - I j (k i ,I i,qmax ),
[0013] wherein, ΔI j i,q (k, I) represents the overcurrent coefficient of the i-th new energy unit, Δk represents the overcurrent coefficient perturbation step, I j (k i ,I i,qmax + ΔI i,qmax ) represents the short-circuit current of the j-th bus after the fixed value current multiple perturbation, ΔI i,qmax represents the fixed value current multiple perturbation step.
[0014] Specifically, the restriction measure generating step comprises: adjusting the overcurrent coefficient and the fixed value current multiple of the effective new energy unit respectively to obtain a plurality of adjustment schemes corresponding to the effective new energy unit; combining the adjustment schemes of each new energy unit in the effective new energy unit set to obtain a plurality of candidate restriction measures corresponding to the effective new energy unit set; determining the value range of the overcurrent coefficient and the fixed value current multiple of the effective new energy unit; keeping the overcurrent coefficient unchanged, and taking values in the value range of the fixed value current multiple with a first perturbation step to obtain a plurality of fixed value current multiple parameter adjustment schemes; keeping the fixed value current multiple unchanged, and taking values in the value range of the overcurrent coefficient with a second perturbation step to obtain a plurality of overcurrent coefficient parameter adjustment schemes; and combining the obtained fixed value current multiple parameter adjustment schemes and overcurrent coefficient parameter adjustment schemes to obtain a plurality of adjustment schemes of the effective new energy unit.
[0015] Specifically, the identification step comprises: applying the candidate restriction measure to the first to-be-controlled mode in the unverified to-be-controlled mode one by one, and determining whether the bus short-circuit current is higher than the safety standard and whether the transient voltage verification is passed.
[0016] Specifically, if the short-circuit current of the bus controlled by the candidate limiting measure is not higher than the safety standard and the transient voltage check passes, the corresponding candidate limiting measure is taken as an effective limiting measure, the parameter adjustment range of the effective new energy unit set is determined according to the parameter values of all effective limiting measures, and the implementation time period of the corresponding to-be-controlled mode is taken as an effective limiting time period.
[0017] Specifically, if the short-circuit current of the bus controlled by the candidate limiting measure is not higher than the safety standard or the short-circuit current of the bus controlled by the candidate limiting measure is not higher than the safety standard but the transient voltage check does not pass, the parameter adjustment range of the current candidate limiting measure is used, and the implementation time period of the corresponding to-be-controlled mode is taken as an invalid limiting time period.
[0018] The application also provides a new energy unit short-circuit current control measure effective time period identification system, comprising: an operating mode acquisition unit, a short-circuit identification unit, an effective unit screening unit, a limiting measure generation unit, an effective limiting time period identification unit, a limiting measure regeneration unit and a synthesis unit, wherein: the operating mode acquisition unit is used to acquire a plurality of operating modes of a future target time period of a power grid; the short-circuit identification unit is used to calibrate the short-circuit current of a bus in the power grid under each operating mode, and screen out an operating mode in which the short-circuit current of the bus in the target time period is higher than a safety standard, and take the screened operating mode as a to-be-controlled mode; the effective unit screening unit is used to screen corresponding effective new energy units for the to-be-controlled mode, and obtain an effective new energy unit set; the limiting measure generation unit is used to perform a limiting measure generation step on the effective new energy unit set, and obtain a plurality of candidate limiting measures corresponding to the effective new energy unit set; the effective limiting time period identification unit is used to perform an identification step on the to-be-controlled mode, determine the parameter adjustment range of the effective new energy unit set, and determine the effective limiting time period; the limiting measure regeneration unit is used to perform the limiting measure generation step within the parameter adjustment range of the effective new energy unit set, again obtain a plurality of candidate limiting measures corresponding to the effective new energy unit set, and transfer to the effective limiting time period identification unit to perform the identification step until all to-be-controlled modes are identified; and the synthesis unit is used to combine all effective limiting time periods determined in the identification step, obtain all effective time periods of the new energy unit short-circuit current control measure in the target time period, and obtain the corresponding candidate limiting measures.
[0019] Specifically, the effective unit screening unit is configured to calculate electrical distances between new energy units and buses with short-circuit currents higher than a safety standard, and screen new energy units with electrical distances less than a standard distance as candidate new energy units; calculate short-circuit current sensitivities of the candidate new energy units to short-circuit currents of the buses with short-circuit currents higher than the safety standard, and screen candidate new energy units with short-circuit current sensitivities higher than corresponding sensitivity thresholds as effective new energy units; the short-circuit current sensitivity includes an overcurrent coefficient sensitivity and a constant current multiple sensitivity.
[0020] Specifically, the effective unit screening unit is configured to calculate the overcurrent coefficient sensitivity by using the following formula:
[0021] ΔI j i,k = I j (k i + Δk, I i,qmax ) - I j (k i , I i,qmax ),
[0022] wherein, ΔI j i,k represents an overcurrent coefficient sensitivity of an i-th new energy unit to an overcurrent coefficient of a j-th bus, I j (k i + Δk, I i,qmax ) represents a short-circuit current of the j-th bus after overcurrent coefficient perturbation, I j (k i , I i,qmax ) represents a short-circuit current of the j-th bus before perturbation, k i represents an overcurrent coefficient of the i-th new energy unit, Δk represents an overcurrent coefficient perturbation step, and I i,qmax represents a constant current multiple of the i-th new energy unit.
[0023] Specifically, the effective unit screening unit is configured to calculate the constant current multiple sensitivity by using the following formula:
[0024] ΔI j i,q = I j (k i , I i,qmax + ΔI i,qmax ) - I j (k i , I i,qmax ),
[0025] wherein, ΔI j i,q represents a constant current multiple sensitivity of an i-th new energy unit to a constant current multiple of a j-th bus, I j(k i ,I i,qmax +ΔI i,qmax ) represents the short-circuit current of the jth bus after the fixed current multiple perturbation, I j (k i ,I i,qmax ) represents the short-circuit current of the jth bus before the perturbation, k i represents the overcurrent coefficient of the ith new energy unit, I i,qmax represents the fixed current multiple of the ith new energy unit, ΔI i,qmax represents the fixed current multiple perturbation step.
[0026] Specifically, the restriction measure generating unit is configured to perform a restriction measure generating step, and the restriction measure generating step includes: adjusting the overcurrent coefficient and the fixed current multiple of each effective new energy unit respectively to obtain a plurality of adjustment schemes corresponding thereto, and combining the adjustment schemes of each new energy unit in the effective new energy unit set to obtain a plurality of candidate restriction measures corresponding to the effective new energy unit set; the step of adjusting the overcurrent coefficient and the fixed current multiple of each effective new energy unit respectively to obtain a plurality of adjustment schemes corresponding thereto includes: determining the value range of the overcurrent coefficient and the fixed current multiple of the effective new energy unit; keeping the overcurrent coefficient unchanged, and taking values in the value range of the fixed current multiple with a first perturbation step to obtain a plurality of fixed current multiple parameter adjustment schemes; keeping the fixed current multiple unchanged, and taking values in the value range of the overcurrent coefficient with a second perturbation step to obtain a plurality of overcurrent coefficient parameter adjustment schemes; and combining the obtained fixed current multiple parameter adjustment schemes and overcurrent coefficient parameter adjustment schemes to obtain a plurality of adjustment schemes of the effective new energy unit.
[0027] Specifically, the effective restriction period identifying unit is configured to perform an identifying step, and the identifying step includes: applying each candidate restriction measure to the first to-be-controlled mode in the unverified to-be-controlled mode, and determining whether the bus short-circuit current is higher than the safety standard and the transient voltage verification is passed.
[0028] Specifically, the effective restriction period identifying unit is configured to, if there is a candidate restriction measure that controls the short-circuit current of the bus to be not higher than the safety standard and the transient voltage verification to be passed, take the corresponding candidate restriction measure as an effective restriction measure, determine the parameter adjustment range of the effective new energy unit set according to the parameter values of all effective restriction measures, and take the implementation period of the corresponding to-be-controlled mode as the effective restriction period.
[0029] Specifically, the effective limiting period identification unit is used for, if the candidate limiting measure does not exist or the candidate limiting measure exists but the transient voltage check fails, using the parameter adjustment range of the current candidate limiting measure, and taking the implementation period of the corresponding to-be-controlled mode as the invalid limiting period.
[0030] The application further provides an electronic device comprising a memory and a processor, wherein the memory stores a computer program executable by the processor, and when the computer program is executed by the processor, the method for identifying the effective period of the short-circuit current control measure of the new energy unit according to any one of the application is executed.
[0031] The application further provides a computer readable storage medium, which stores a computer program, and when the computer program is executed by a processor, the steps of the method for identifying the effective period of the short-circuit current control measure of the new energy unit according to any one of the application are implemented.
[0032] Beneficial effects: compared with the prior art, the application has the following obvious advantages: identifying which time period in the future can limit the short-circuit current by adjusting the control parameters of the new energy unit, and providing the corresponding new energy unit control parameter adjustment scheme. BRIEF DESCRIPTION OF DRAWINGS
[0033] Figure 1 The application provides a method for identifying the effective period of the short-circuit current control measure of the new energy unit. DETAILED DESCRIPTION
[0034] The technical solutions of the application will be further described below with reference to the drawings.
[0035] In specific implementation, the key control parameters affecting the reactive current component of the new energy unit include the overcurrent coefficient and the fixed current multiple. Simulation results show that the short-circuit current contributed by the new energy unit to the power grid can be reduced by reducing the overcurrent coefficient and the fixed current multiple of the new energy unit, thereby reducing the short-circuit current of the fault bus of the system and expanding the short-circuit current control means.
[0036] Reference Figure 1 The application provides a method for identifying the effective period of the short-circuit current control measure of the new energy unit.
[0037] In the embodiment of the application, a plurality of operating modes of the power grid in a future target period are acquired.
[0038] In a specific implementation, the operation mode of the power grid can be comprehensively determined by the power generation plan, the direct current dispatching plan, the power equipment maintenance plan, the load distribution, and the new energy power generation distribution of the power grid. The operation mode of a future target period, for example, all operation modes of the power grid in the next 4 hours.
[0039] In the embodiment of the present application, the short-circuit current of the bus in the power grid under each operation mode is calibrated, and the operation mode in which the short-circuit current of the bus in the target period is higher than the safety standard (which can be set according to the actual application scenario) is screened out, and the operation mode screened out is taken as the to-be-controlled mode.
[0040] In a specific implementation, after obtaining the operation mode of the power grid, the short-circuit current after a short-circuit fault of the bus under the corresponding operation mode can be simulated and calibrated. If the short-circuit current of one or more buses is higher than the safety standard, it indicates that the corresponding operation mode of the power grid needs to be controlled to limit the size of the short-circuit current.
[0041] In the embodiment of the present application, for the to-be-controlled mode, the corresponding effective new energy unit is screened out to obtain the set of effective new energy units.
[0042] In the embodiment of the present application, the electrical distance between the new energy unit in the candidate measure set and the bus with the short-circuit current higher than the safety standard is calculated, and the new energy unit with the electrical distance less than the standard distance is screened out as the candidate new energy unit. The short-circuit current sensitivity of the candidate new energy unit to the short-circuit current of the bus with the short-circuit current higher than the safety standard is calculated, and the candidate new energy unit with the short-circuit current sensitivity higher than the corresponding sensitivity threshold (which can be set according to the actual application scenario) is screened out as the effective new energy unit. The short-circuit current sensitivity includes the overcurrent coefficient sensitivity and the fixed current multiple sensitivity.
[0043] In a specific implementation, the electrical distance and the short-circuit current sensitivity both represent the degree of influence of the change of the control parameter of the new energy unit on the bus with the over-standard short-circuit current. The closer the electrical distance and the higher the short-circuit current sensitivity, the greater the degree of influence of the change of the control parameter of the new energy unit on the bus with the over-standard short-circuit current, that is, the stronger the limiting effect on the short-circuit current. Therefore, the two indicators are screened out.
[0044] In the embodiment of the present application, the overcurrent coefficient sensitivity is calculated by the following formula:
[0045] ΔI j i,k =I j (k i +Δk,I i,qmax )-I j (k i ,I i,qmax ),
[0046] wherein, ΔIj i,k denotes the overcurrent coefficient of the i th new energy unit to the overcurrent coefficient sensitivity of the j th bus,
[0047] I j (k i +Δk,I i,qmax ) denotes the short-circuit current of the j th bus after the overcurrent coefficient perturbation, I j (k i ,I i,qmax ) denotes the short-circuit current of the j th bus before the (overcurrent coefficient or rated current multiple) perturbation, k i denotes the overcurrent coefficient of the i th new energy unit, and Δk denotes the overcurrent coefficient perturbation step (which can be set according to the actual application scene), I i,qmax denotes the rated current multiple of the i th new energy unit.
[0048] In the embodiment of the application, ΔI j i,q =I j (k i ,I i,qmax +ΔI i,qmax )-I j (k i ,I i,qmax ),
[0049] wherein ΔI j i,q denotes the rated current multiple of the i th new energy unit to the rated current multiple sensitivity of the j th bus, I j (k i ,I i,qmax +ΔI i,qmax ) denotes the short-circuit current of the j th bus after the rated current multiple perturbation, ΔI i,qmax denotes the rated current multiple perturbation step (which can be set according to the actual application scene).
[0050] In the embodiment of the application, the effective new energy unit set is executed to perform the restriction measure generation step, and the restriction measure generation step comprises: adjusting the overcurrent coefficient and the rated current multiple of the effective new energy unit respectively to obtain a plurality of adjustment schemes corresponding thereto.
[0051] In the embodiment of the present application, the overcurrent coefficient and the value range (parameter adjustment range) of the fixed current multiple of the effective new energy unit are determined; the overcurrent coefficient is kept unchanged, and the fixed current multiple is taken in the value range with a first perturbation step (for example, 0.2), to obtain A fixed current multiple parameter adjustment schemes; the fixed current multiple is kept unchanged, and the overcurrent coefficient is taken in the value range with a second perturbation step (for example, 0.3), to obtain B overcurrent coefficient parameter adjustment schemes; the obtained fixed current multiple parameter adjustment schemes and overcurrent coefficient parameter adjustment schemes are combined, to obtain A+B adjustment schemes of the effective new energy unit.
[0052] In the specific implementation, for a new energy unit, the overcurrent coefficient and the fixed current multiple are both parameters adjusted in the present application, one of which is kept unchanged, and the other is adjusted with a fixed step, and each step is an adjustment scheme.
[0053] In the embodiment of the present application, the adjustment schemes of each new energy unit in the effective new energy unit set are combined, to obtain multiple candidate limiting measures corresponding to the effective new energy unit set.
[0054] In the specific implementation, one effective new energy unit may have A+B adjustment schemes, and the adjustment schemes of each new energy unit in the effective new energy unit set are arranged and combined, to obtain all candidate limiting measures corresponding to the effective new energy unit set. For example, there are three new energy units in the effective new energy unit set, and each of the three new energy units has two adjustment schemes, so that the effective new energy unit set will have 2*2*2=8 candidate limiting measures.
[0055] In the embodiment of the present application, the identification step is executed for the control mode checking, and the identification step includes: applying the candidate limiting measures to the first control mode in the unverified control mode (the control mode not executed in the identification step) one by one, determining the parameter adjustment range of the effective new energy unit set and the effective limiting period according to whether the bus short-circuit current is higher than the safety standard and whether the transient voltage is checked.
[0056] In the embodiment of the present application, the limiting measure generation step is executed in the parameter adjustment range of the effective new energy unit set, the multiple candidate limiting measures corresponding to the effective new energy unit set are obtained again, and the identification step is executed, until all the control modes are identified.
[0057] In the specific implementation, the candidate limiting measures are applied to the control mode, and the control parameters of the new energy unit are adjusted according to the candidate limiting measures (usually through simulation calculation data), to calculate the size of the bus short-circuit current under the control mode.
[0058] In the embodiment of the present application, if the short-circuit current of the bus controlled by the candidate limiting measure is not higher than the safety standard and the transient voltage check passes, the corresponding candidate limiting measure is taken as an effective limiting measure, the parameter adjustment range (value range) of the effective new energy unit set is determined according to the parameter value of all effective limiting measures, and the implementation time period of the corresponding to-be-controlled mode is taken as an effective limiting time period.
[0059] In the embodiment of the present application, if the short-circuit current of the bus controlled by the candidate limiting measure is not higher than the safety standard or the short-circuit current of the bus controlled by the candidate limiting measure is not higher than the safety standard but the transient voltage check does not pass, the parameter adjustment range (value range) of the current candidate limiting measure is used, and the implementation time period of the corresponding to-be-controlled mode is taken as an invalid limiting time period.
[0060] In a specific implementation, for example, the range of the overcurrent coefficient of the generated 8 candidate limiting measures is [0.1, 2.5], the range of the fixed current multiple is [0.1, 1.2], there are 16 power grid operation modes in the future target time period, the short-circuit current of the first to fifth modes is not over-standard, the short-circuit current of the sixth to sixteenth modes is over-standard, the generated 8 candidate limiting measures are applied to the sixth mode one by one, and the short-circuit current and the transient voltage check are performed, the check result is that the short-circuit current of the bus controlled by 5 candidate limiting measures is not higher than the safety standard and the transient voltage check passes, and the overcurrent coefficient of the 5 candidate limiting measures is in the range of [0.5-1.5] and the fixed current multiple is in the range of [0.3-1.0], then the limiting measure generation step (the overcurrent coefficient is in the range of [0.5-1.5] and the fixed current multiple is in the range of [0.3-1.0]) is used to generate multiple candidate limiting measures for the seventh operation mode, and the generated candidate limiting measures are applied to the seventh operation mode, and the short-circuit current and the transient voltage check are performed, and so on, until the sixth to sixteenth operation modes are all applied to the candidate limiting measures and the short-circuit current and the transient voltage check and the effective limiting time period identification are performed, and then the process is ended; if the generated 8 candidate limiting measures are applied to the sixth mode one by one, and the short-circuit current and the transient voltage check are performed, the check result is that all candidate limiting measures cannot control the short-circuit current of the bus to be not higher than the safety standard or the transient voltage check does not pass, then the range of the overcurrent coefficient [0.1, 2.5] and the range of the fixed current multiple [0.1, 1.2] are still taken as the parameter adjustment range to perform the limiting measure generation step (that is, if all candidate limiting measures under the Nth mode cannot control the short-circuit current of the bus to be not higher than the safety standard or the transient voltage check does not pass, the parameter adjustment range under the Nth mode is taken as the parameter value range of the N+1th mode), and multiple candidate limiting measures for the seventh operation mode are generated, and the generated candidate limiting measures are applied to the seventh operation mode.
[0061] In the embodiment of the present application, according to all valid limit period combinations determined in the identification step, all valid periods of the new energy unit short-circuit current control measures in the target period and the corresponding candidate (valid) limit measures are obtained.
[0062] In a specific implementation, for example, the candidate limit measures are applied to the 6th to 16th operation modes in which the bus short-circuit current exceeds the standard, and the short-circuit current of the 6th to 10th operation modes does not exceed the standard and the transient voltage check passes after the corresponding candidate limit measures are applied, then the total period corresponding to the 6th to 10th operation modes is the all valid period, and the candidate limit measures that can control the short-circuit current not to exceed the standard and the transient voltage check to pass are the valid limit measures.
[0063] In a specific implementation, the present application provides a method with strong operability, which identifies which periods in the future can limit the short-circuit current through new energy unit control parameter adjustment, and provides the corresponding new energy unit control parameter adjustment scheme, so that the power grid short-circuit current can be efficiently and more conveniently limited.
[0064] The application further provides a new energy unit short-circuit current control measure effective period identification system, comprising: an operation mode acquisition unit, a short-circuit identification unit, an effective unit screening unit, a limitation measure generation unit, an effective limitation period identification unit, a limitation measure regeneration unit and a synthesis unit, wherein: the operation mode acquisition unit is configured to acquire a plurality of operation modes of a future target period of a power grid; the short-circuit identification unit is configured to calibrate the short-circuit current of a bus in the power grid in each operation mode, and screen out an operation mode in which the short-circuit current of the bus in the target period is higher than a safety standard, and take the screened operation mode as a to-be-controlled mode; the effective unit screening unit is configured to screen corresponding effective new energy units for the to-be-controlled mode, and obtain an effective new energy unit set; the limitation measure generation unit is configured to perform a limitation measure generation step on the effective new energy unit set, and the limitation measure generation step comprises: adjusting the overcurrent coefficient and the fixed current multiple of the effective new energy unit respectively to obtain a plurality of adjustment schemes corresponding to the effective new energy unit, and combining the adjustment schemes of each new energy unit in the effective new energy unit set to obtain a plurality of candidate limitation measures corresponding to the effective new energy unit set; the effective limitation period identification unit is configured to perform an identification step on the to-be-controlled mode, and the identification step comprises: applying the candidate limitation measures to a first to-be-controlled mode in the uncalibrated to-be-controlled mode one by one, and determining the parameter adjustment range and the effective limitation period of the effective new energy unit set according to whether the short-circuit current of the bus is higher than the safety standard and whether the transient voltage is calibrated to pass; the limitation measure regeneration unit is configured to perform the limitation measure generation step within the parameter adjustment range of the effective new energy unit set, to obtain a plurality of candidate limitation measures corresponding to the effective new energy unit set again, and transfer to the effective limitation period identification unit to perform the identification step until all the to-be-controlled modes are identified; and the synthesis unit is configured to combine all the effective limitation periods determined in the identification step to obtain all the effective periods of the new energy unit short-circuit current control measure in the target period and the corresponding candidate limitation measures.
[0065] In the embodiment of the application, the effective unit screening unit is configured to calculate the electrical distance between the new energy unit and the bus with the short-circuit current higher than the safety standard, screen the new energy unit with the electrical distance less than a standard distance as a candidate new energy unit, calculate the short-circuit current sensitivity of the candidate new energy unit to the short-circuit current of the bus with the short-circuit current higher than the safety standard, and screen the candidate new energy unit with the short-circuit current sensitivity higher than a corresponding sensitivity threshold as an effective new energy unit; the short-circuit current sensitivity comprises an overcurrent coefficient sensitivity and a fixed current multiple sensitivity.
[0066] In the embodiment of the application, the effective unit screening unit calculates the overcurrent coefficient sensitivity by using the following formula:
[0067] ΔI j i,k= I j (k i + Δk, I i,qmax ) - I j (k i , I i,qmax ),
[0068] wherein, ΔI j i,k represents the overcurrent coefficient sensitivity of the i th new energy unit to the overcurrent coefficient of the j th bus, I j (k i + Δk, I i,qmax ) represents the short-circuit current of the j th bus after the overcurrent coefficient perturbation, I j (k i , I i,qmax ) represents the short-circuit current of the j th bus before the perturbation, k i represents the overcurrent coefficient of the i th new energy unit, Δk represents the overcurrent coefficient perturbation step, I i,qmax represents the fixed current multiple of the i th new energy unit.
[0069] In the embodiment of the application, the effective unit screening unit calculates the fixed current multiple sensitivity by using the following formula:
[0070] ΔI j i,q = I j (k i , I i,qmax + ΔI i,qmax ) - I j (k i , I i,qmax ),
[0071] wherein, ΔI j i,q represents the fixed current multiple sensitivity of the i th new energy unit to the fixed current multiple of the j th bus, I j (k i , I i,qmax + ΔI i,qmax ) represents the short-circuit current of the j th bus after the fixed current multiple perturbation, I j (k i , I i,qmax ) represents the short-circuit current of the j th bus before the perturbation, k i represents the overcurrent coefficient of the i th new energy unit, I i,qmax represents the fixed current multiple of the i th new energy unit, ΔI i,qmax represents the fixed current multiple perturbation step.
[0072] In the embodiment of the present application, the restriction measure generating unit is configured to perform a restriction measure generating step, which includes: adjusting the overcurrent coefficient and the fixed current multiple of the effective new energy unit respectively to obtain a plurality of adjustment schemes corresponding thereto, and combining the adjustment schemes of each new energy unit in the effective new energy unit set to obtain a plurality of candidate restriction measures corresponding to the effective new energy unit set; the step of adjusting the overcurrent coefficient and the fixed current multiple of the effective new energy unit respectively to obtain a plurality of adjustment schemes corresponding thereto includes: determining the value range of the overcurrent coefficient and the fixed current multiple of the effective new energy unit; keeping the overcurrent coefficient unchanged, and taking values in the value range of the fixed current multiple with a first perturbation step to obtain a plurality of fixed current multiple parameter adjustment schemes; keeping the fixed current multiple unchanged, and taking values in the value range of the overcurrent coefficient with a second perturbation step to obtain a plurality of overcurrent coefficient parameter adjustment schemes; and combining the obtained fixed current multiple parameter adjustment schemes and overcurrent coefficient parameter adjustment schemes to obtain a plurality of adjustment schemes of the effective new energy unit.
[0073] In the embodiment of the present application, the effective restriction period identifying unit is configured to perform an identifying step, which includes: applying the candidate restriction measures to the first to-be-controlled mode in the unverified to-be-controlled mode one by one, and determining whether the bus short-circuit current is higher than the safety standard and whether the transient voltage verification is passed.
[0074] In the embodiment of the present application, the effective restriction period identifying unit is configured to, if the candidate restriction measures control the bus short-circuit current to be not higher than the safety standard and the transient voltage verification to be passed, take the corresponding candidate restriction measures as the effective restriction measures, determine the parameter adjustment range of the effective new energy unit set according to the parameter values of all the effective restriction measures, and take the implementation period of the corresponding to-be-controlled mode as the effective restriction period.
[0075] In the embodiment of the present application, the effective restriction period identifying unit is configured to, if there is no candidate restriction measure to control the bus short-circuit current to be not higher than the safety standard or there is a candidate restriction measure to control the bus short-circuit current to be not higher than the safety standard but the transient voltage verification is not passed, keep the parameter adjustment range of the current candidate restriction measure, and take the implementation period of the corresponding to-be-controlled mode as the invalid restriction period.
[0076] The present application also provides an electronic device comprising a memory and a processor, wherein the memory stores a computer program executable by the processor, and when the computer program is executed by the processor, the method for identifying the effective period of the short-circuit current control measure of the new energy unit according to any one of the present application is executed.
[0077] The application further provides a computer readable storage medium, which stores a computer program, and the computer program is executed by a processor to implement the steps of the new energy unit short-circuit current control measure effective period identification method according to any one of the application.
[0078] Those skilled in the art will appreciate that embodiments of the application can be supplied as methods, systems, or computer program products. Accordingly, the application can be embodied in the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the application can be embodied in the form of a computer program product on one or more computer readable storage media (including, but not limited to, disk memory, CD-ROMs, optical storage media, etc.) having computer usable program code embodied thereon.
[0079] The application is described with reference to the flowcharts and / or block diagrams of the methods, apparatus (systems), and computer program products according to embodiments of the application. It should be understood that each flow and / or block in the flowcharts and / or block diagrams, as well as combinations of flows and / or blocks in the flowcharts and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general purpose computer, a special purpose computer, an embedded processor, or other programmable data processing apparatus to produce a machine, so that the instructions, which are executed via the processor of the computer or other programmable data processing apparatus, generate a means for implementing the functions specified in the flowcharts and / or block diagrams. Figure 1 one or more flows and / or blocks Figure 1 an apparatus with the specified functions of one or more blocks.
[0080] These computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing apparatus to work in a specific manner, so that the instructions stored in the computer readable memory produce a manufacture product including instruction apparatus, which implements the functions specified in the flowcharts and / or block diagrams. Figure 1 one or more flows and / or blocks Figure 1 an apparatus with the specified functions of one or more blocks.
[0081] These computer program instructions can also be loaded into a computer or other programmable data processing apparatus, so that a series of operation steps are performed on the computer or other programmable data processing apparatus to produce a computer implemented process, so that the instructions executed on the computer or other programmable data processing apparatus provide a process for implementing the functions specified in the flowcharts and / or block diagrams. Figure 1 one or more flows and / or blocks Figure 1 an apparatus with the specified functions of one or more blocks.
Claims
1. A method for identifying an effective time period of a short-circuit current control measure of a new energy unit, characterized in that, The method comprises the following steps: obtaining multiple operation modes of the power grid in a future target period; calibrating short-circuit currents of buses in the power grid in each operation mode, and screening out operation modes in which the short-circuit currents of the buses in the target period are higher than a safety standard, and taking the screened operation modes as to-be-controlled modes; for each to-be-controlled mode, screening out corresponding effective new energy units to obtain an effective new energy unit set; performing a restriction measure generation step on the effective new energy unit set to obtain multiple candidate restriction measures corresponding to the effective new energy unit set; performing an identification step on the to-be-controlled modes to determine a parameter adjustment range of the effective new energy unit set and an effective restriction period; in the parameter adjustment range of the effective new energy unit set, performing the restriction measure generation step again to obtain multiple candidate restriction measures corresponding to the effective new energy unit set, and performing the identification step until all the to-be-controlled modes are identified; combining all the effective restriction periods determined in the identification step to obtain all effective periods of the new energy unit short-circuit current control measures in the target period and corresponding candidate restriction measures.
2. The method for identifying the effective time period of short-circuit current control measures for new energy generating units according to claim 1, characterized in that, The step of screening out corresponding effective new energy units to obtain an effective new energy unit set comprises the following steps: calculating an electrical distance between a new energy unit and a bus with a short-circuit current higher than a safety standard, and screening out new energy units with an electrical distance less than a standard distance as candidate new energy units; calculating a short-circuit current sensitivity of a candidate new energy unit to a bus with a short-circuit current higher than a safety standard, and screening out candidate new energy units with a short-circuit current sensitivity higher than a corresponding sensitivity threshold as effective new energy units; the short-circuit current sensitivity comprises an overcurrent coefficient sensitivity and a fixed current multiple sensitivity.
3. The method of claim 2, wherein the effective time period of the short-circuit current control measure of the new energy unit is identified based on the short-circuit current of the new energy unit. The overcurrent coefficient sensitivity is calculated by the following formula: ΔI j i,k = I j (k i + Δk, I i,qmax ) - I j (k i , I i,qmax ), where ΔI j i,k denotes the overcurrent coefficient sensitivity of the ith new energy unit to the overcurrent coefficient of the jth bus, I j (k i + Δk, I i,qmax ) denotes the short-circuit current of the jth bus after the overcurrent coefficient perturbation, I j (k i , I i,qmax ) denotes the short-circuit current of the jth bus before the perturbation, k i denotes the overcurrent coefficient of the ith new energy unit, Δk denotes the overcurrent coefficient perturbation step, I i,qmax denotes the fixed current multiple of the ith new energy unit.
4. The method of claim 2, wherein the effective time period of the short-circuit current control measure of the new energy unit is identified based on the short-circuit current of the new energy unit. The fixed current multiple sensitivity is calculated by the following formula: ΔI j i,q = I j (k i , I i,qmax + ΔI i,qmax ) - I j (k i , I i,qmax ), Where, ΔI j i,q I represents the sensitivity of the set current multiple of the i-th new energy unit to the set current multiple of the j-th bus. j (k i ,I i,qmax +ΔI i,qmax ) represents the short-circuit current of the j-th bus after a perturbation by a multiple of the fixed current. j (k i ,I i,qmax ) represents the short-circuit current of the j-th bus before the perturbation, k i I represents the overcurrent coefficient of the i-th new energy unit. i,qmax ΔI represents the set current multiple of the i-th new energy unit. i,qmax This indicates the perturbation step size of the fixed current multiple.
5. The method of claim 1, wherein the method further comprises: The restriction measure generation step comprises the following steps: adjusting an overcurrent coefficient and a fixed current multiple of each effective new energy unit respectively to obtain multiple adjustment schemes corresponding to the effective new energy unit, and combining the adjustment schemes of each new energy unit in the effective new energy unit set to obtain multiple candidate restriction measures corresponding to the effective new energy unit set; The step of adjusting an overcurrent coefficient and a fixed current multiple of each effective new energy unit respectively to obtain multiple adjustment schemes corresponding to the effective new energy unit comprises the following steps: determining a value range of the overcurrent coefficient and the fixed current multiple of the effective new energy unit; keeping the overcurrent coefficient unchanged, taking values in the value range of the fixed current multiple with a first perturbation step to obtain multiple fixed current multiple parameter adjustment schemes; keeping the fixed current multiple unchanged, taking values in the value range of the overcurrent coefficient with a second perturbation step to obtain multiple overcurrent coefficient parameter adjustment schemes; 6. The method of claim 1, wherein the method further comprises: combining the obtained fixed current multiple parameter adjustment schemes and overcurrent coefficient parameter adjustment schemes to obtain multiple adjustment schemes of the effective new energy unit. The identification step comprises the following steps: applying each candidate restriction measure to a first to-be-controlled mode in the to-be-controlled modes which have not been checked, and checking whether the short-circuit current of the bus is higher than the safety standard and whether the transient voltage check is passed.
7. The method of claim 6, wherein the method further comprises: determining the effective time period of the short-circuit current control measure of the new energy unit based on the short-circuit current of the new energy unit. The parameter adjustment range of the effective new energy unit set and the effective limiting period are determined according to whether the bus short-circuit current is higher than the safety standard and whether the transient voltage check is passed, and the parameter adjustment range of the effective new energy unit set and the effective limiting period are determined. If there is a candidate limiting measure to control the short-circuit current of the bus not higher than the safety standard and the transient voltage check is passed, the corresponding candidate limiting measure is taken as the effective limiting measure, the parameter adjustment range of the effective new energy unit set is determined according to the parameter value of all effective limiting measures, and the implementation period of the corresponding to-be-controlled mode is taken as the effective limiting period. If there is no candidate limiting measure to control the short-circuit current of the bus not higher than the safety standard or there is a candidate limiting measure to control the short-circuit current of the bus not higher than the safety standard but the transient voltage check is not passed, the parameter adjustment range of the current candidate limiting measure is used, and the implementation period of the corresponding to-be-controlled mode is taken as the invalid limiting period.
8. A system for identifying an effective period of short-circuit current control measures for a new energy unit, characterized in that, It comprises: The operation mode acquisition unit, the short-circuit identification unit, the effective unit screening unit, the limiting measure generation unit, the effective limiting period identification unit, the limiting measure regeneration unit and the synthesis unit, wherein: The operation mode acquisition unit is used to acquire a plurality of operation modes of a future target period of the power grid. The short-circuit identification unit is used to calibrate the short-circuit current of the bus in the power grid under each operation mode, and to screen out the operation mode in which the short-circuit current of the bus in the target period is higher than the safety standard, and to take the screened operation mode as the to-be-controlled mode. The effective unit screening unit is used to screen the corresponding effective new energy unit for the to-be-controlled mode, and to obtain the effective new energy unit set. The limiting measure generation unit is used to perform the limiting measure generation step on the effective new energy unit set, and to obtain a plurality of candidate limiting measures corresponding to the effective new energy unit set. The effective limiting period identification unit is used to perform the identification step on the to-be-controlled mode, to determine the parameter adjustment range of the effective new energy unit set, and to determine the effective limiting period. The limiting measure regeneration unit is used to perform the limiting measure generation step in the parameter adjustment range of the effective new energy unit set, to again obtain a plurality of candidate limiting measures corresponding to the effective new energy unit set, and to perform the identification step by the effective limiting period identification unit until all the to-be-controlled modes are identified. The synthesis unit is used to combine all the effective limiting periods determined in the identification step, to obtain the whole effective period of the new energy unit short-circuit current control measure in the target period, and to obtain the corresponding candidate limiting measure.
9. An electronic device, comprising: The computer program is executed by the processor to implement the steps of the new energy unit short-circuit current control measure effective period identification method in any one of claims 1 to 7.
10. A computer-readable storage medium having stored thereon a computer program, characterized in that, The computer program is executed by the processor to implement the steps of the new energy unit short-circuit current control measure effective period identification method in any one of claims 1 to 7.