A method and system for realizing automatic power curve comprehensive calibration of direct current transmission

Abstract

Embodiments of the present application relate to a kind of direct current transmission automatic power curve comprehensive verification implementation method and system, dispatch center issues power curve to remote control system, and the number of inconsistency is set;After monitoring system obtains power curve, remote control system will inconsistent mark be cleared and the imbalance mark of this curve is set;Monitoring system carries out power value check, if it is checked, then it is stored and is sent back to remote control system and clears the imbalance mark of this curve, otherwise alarm;Remote control system is started after default clearing period data consistent mark, periodically from monitoring system obtains the power curve stored, and after obtaining all power curves stored in monitoring system, period data consistent mark is set;Remote control system only when period data consistent mark, data inconsistency number and imbalance mark all meet the requirement, only then support dispatch center to obtain monitoring system power curve.It can effectively reduce the work intensity of operating personnel, and improve work efficiency and reduce work stress.

Description

Technical Field

[0001] This invention relates to the field of high-voltage direct current (HVDC) transmission technology, and in particular to a method and system for implementing automatic power curve comprehensive verification of HVDC transmission. Background Technology

[0002] DC power control is a component of DC power transmission control systems. It maintains the power transmitted by the DC system at a given value.

[0003] Power control typically employs two control methods: (1) manual control, where operators manually input the power setpoint and power rise / fall rate; and (2) automatic control, where the power setpoint is pre-programmed into a power curve (usually in daily units) and the computer automatically sends the planned power value and power rise / fall rate according to the time points.

[0004] Currently, the power trading market is gradually establishing a spot market for electricity, which requires adjusting the power output multiple times a day according to the demand for electricity load. If a manual method is used, the workload of the station's operation and monitoring personnel will be too heavy, and it will easily affect the work of other stations in the converter station. Therefore, it is imperative to adopt an automatic power curve control method.

[0005] The automatic power curve is a daily power transmission plan issued by the dispatch center for a DC transmission project. The plan is arranged by time points and is divided into two cases: 1. One power point every 15 minutes, 96 power points per day, which can be adjusted 15 minutes in advance; 2. One point every 5 minutes, 288 power points per day, which can be adjusted 5 minutes in advance.

[0006] In the current project, after receiving the automatic power curve, operators need to verify the data at each point to ensure consistency between the set data and the original dispatch center data, thus guaranteeing data accuracy. After verification, the data can be input into the background monitoring system in two ways: first, manually inputting it after printing; second, importing it directly into the system via file import. Due to increasingly frequent load dispatching, multiple curve adjustments may occur within a single day, requiring re-tuning and verification of the automatic power curve each time. This consumes considerable manpower and time, especially when adjustment time is tight, as manual verification is prone to errors. Summary of the Invention

[0007] To address the problems existing in the prior art, this invention provides a method and system for comprehensive verification of automatic power curves in DC transmission. Based on traditional automatic power functions, the comprehensive verification method automatically verifies the correctness of the power curves. Furthermore, the dispatch center can obtain curve data executed by the monitoring system through a remote control system, forming a closed-loop monitoring system. This closed-loop verification reduces or avoids erroneous power adjustments. Through these methods, the workload of operators can be effectively reduced, work efficiency improved, and work pressure lowered.

[0008] To achieve the above objectives, the present invention provides a method for automatic power curve comprehensive verification of DC transmission, comprising:

[0009] The dispatch center sends the power curve to the remote control system, and the remote control system sets the inconsistency flag.

[0010] After the monitoring system obtains the power curve from the remote control system, the remote control system will clear the inconsistency marker and set the imbalance marker.

[0011] The monitoring system verifies the power value of the acquired power curve. If the verification is successful, the power curve is stored and sent back to the remote control system, and the unbalanced flag of the curve in the remote control system is cleared. Otherwise, the monitoring system alarms, stores the power curve, sends the curve data back to the remote control system, and clears the unbalanced flag of the remote control system.

[0012] After the remote control system is started, the periodic data consistency flag is cleared by default. It periodically retrieves the stored power curves from the monitoring system and sets the periodic data consistency flag after retrieving all the power curves stored in the monitoring system once.

[0013] The dispatch center requests the power curve from the telecontrol system. The telecontrol system transmits the power curve to the dispatch center only when the requirements for periodic data consistency marker, data inconsistency count, and imbalance marker are all met.

[0014] Furthermore, after receiving the power curve, the monitoring system determines the completeness of the curve. If the first or last point is missing, the curve is considered incomplete, the power curve is discarded, and an alarm event is issued.

[0015] Furthermore, the monitoring system performs power value verification on the power curve, including: comparing each curve point by point according to the relationship between each curve in the power curve, and failing the verification if the deviation is greater than a set threshold.

[0016] Furthermore, based on the relationship between the curves in the power curve, each curve is compared point by point, including: summing the corresponding points of the power-side curves and subtracting the corresponding points of the sum-power-side curves. If the difference at any point is greater than a set threshold, the verification fails.

[0017] Furthermore, if the scheduling center fails to receive the power curve within the specified time, it determines that the power curve data transmission or function is abnormal.

[0018] Furthermore, after obtaining the power curve, the scheduling center compares it with the issued power curve to determine whether they are consistent. If they are inconsistent, it is determined that there is an anomaly.

[0019] On the other hand, a system for realizing automatic power curve comprehensive verification of DC transmission is provided, including a dispatch center, a monitoring system and a remote control system;

[0020] The dispatch center sends the power curve to the remote control system, and the remote control system sets the inconsistency flag.

[0021] After the monitoring system obtains the power curve from the remote control system, the remote control system clears the inconsistency mark and sets the imbalance mark. The monitoring system verifies the power value of the power curve. If the verification passes, the monitoring system stores the power curve, sends the curve data back to the remote control system, and clears the imbalance mark of the remote control system. Otherwise, the monitoring system alarms, stores the power curve, sends the curve data back to the remote control system, and clears the imbalance mark of the remote control system.

[0022] After the remote control system is started, the periodic data consistency flag is cleared by default. It periodically retrieves the stored power curves from the monitoring system and sets the periodic data consistency flag after retrieving all the power curves stored in the monitoring system once.

[0023] The dispatch center requests the power curve from the telecontrol system. The telecontrol system transmits the power curve to the dispatch center only when the requirements for periodic data consistency marker, data inconsistency count, and imbalance marker are all met.

[0024] Furthermore, after receiving the power curve, the monitoring system determines the completeness of the curve. If the first or last point is missing, the curve is considered incomplete, the power curve is discarded, and an alarm event is issued.

[0025] Furthermore, the monitoring system compares each curve point by point according to the relationship between the curves in the power curve. If the deviation is greater than a set threshold, the verification fails.

[0026] Furthermore, the monitoring system compares each curve point by point based on the relationship between the curves in the power curve, including:

[0027] The corresponding points of the power-side curve are summed, and the difference is calculated with the corresponding points of the sum-power-side curve. If the difference at any point is greater than a set threshold, the verification fails.

[0028] Furthermore, if the dispatch center fails to receive the power curve within the specified time, it determines that the power curve data transmission or function is abnormal.

[0029] Furthermore, the scheduling center obtains the power curve and compares it with the power curve sent to determine whether they are consistent. If they are inconsistent, it is determined that there is an anomaly.

[0030] The above-described technical solution of the present invention has the following beneficial technical effects:

[0031] This invention, based on traditional automatic power functions, utilizes a comprehensive verification method to automatically verify the correctness of power curves. Furthermore, the dispatch center can obtain curve data executed by the monitoring system through a remote control system, forming a closed-loop monitoring system. This enhanced closed-loop verification reduces or eliminates errors in power adjustment. Through these methods, the workload of operators can be effectively reduced, work efficiency improved, and work pressure lowered. Attached Figure Description

[0032] Figure 1 This is a flowchart illustrating the implementation of automatic power curve comprehensive verification for DC transmission.

[0033] Figure 2 This is a schematic diagram of the system composition for the automatic power curve comprehensive verification of DC transmission. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments and the accompanying drawings. It should be understood that these descriptions are merely exemplary and not intended to limit the scope of the invention. Furthermore, descriptions of well-known structures and techniques are omitted in the following description to avoid unnecessarily obscuring the concept of the invention.

[0035] In some embodiments, a method for implementing automatic power curve comprehensive verification of DC transmission is provided, combined with... Figure 1 It includes the following steps:

[0036] The S100 dispatch center sends the power curve to the remote control system, which then increments the number of inconsistencies by 1.

[0037] After the S200 monitoring system obtains the power curve from the remote control system, the remote control system decrements the inconsistency flag by 1 and increments the imbalance flag by 1.

[0038] The monitoring system sets a power curve integrity judgment condition. A curve is considered complete only if it has a first point and a last point, and then proceeds to step S300; otherwise, the power curve data is discarded, an alarm event is issued, and a curve processing completion signal is sent to the remote control system.

[0039] As shown in Table 1: When the monitoring system obtains the power curve issued by the dispatch center and verifies that the curve has a start power point and an end power point, it considers the curve to be a complete power curve and reports the event shown in Table 1 in the monitoring system.

[0040] Table 1:

[0041]

[0042] The automatic power curve data stored in the monitoring system is synchronized to the remote control system (RCS) using two methods: 1. The RCS periodically retrieves curve data from the monitoring system. After retrieving all power curves (different dates, various curves), the RCS sets the periodic data consistency flag to true. 2. After the curve data is verified by the monitoring system and stored in its database, the RCS actively pushes the stored curve data back to the RCS. For each data retrieval from the RCS, the RCS increments the inconsistency count by 1. Each time the monitoring system processes and pushes back the data, the inconsistency count decrements by 1. If the RCS receives curve data from the dispatch center that has not been retrieved by the monitoring system, it sets the data imbalance flag. Once the monitoring system retrieves the curve data, the data imbalance flag should be cleared.

[0043] The monitoring system described in S300 verifies the power value of the power curve. If the verification passes, the power curve is stored, the curve data is sent back to the remote control system, and the imbalance mark of the remote control system is cleared. Otherwise, an alarm is triggered, the power curve is stored, the curve data is sent back to the remote control system, and the imbalance mark of the remote control system is cleared. (Manually storing the curve will also send the curve data back to the remote control system and clear the imbalance mark of the curve in the remote control system.)

[0044] The monitoring system verifies the power value of the power curve by comparing each curve point by point according to the relationship between the curves in the power curve. If the deviation is greater than a set threshold, the verification fails.

[0045] For example, summing the corresponding points on the power-side curve and subtracting them from the corresponding points on the sum-power-side curve, if the difference at any point is greater than a set threshold, the verification fails.

[0046] In one embodiment, power value verification is performed. The automatic power curve is composed of power points. A point-by-point comparison method is used, comparing the power curve with the sum of the power curve and the power-side curve. The difference between the power curve and the sum of the power-side curve and the sum of the power-side curves cannot be greater than 2. If the condition is met, the power value verification is considered to have passed and is automatically stored in the monitoring system's database. If the condition is not met, an alarm event is reported to the monitoring system, describing which point or power point of the curvature curve does not meet the condition. The event is stored in the monitoring system's database and an invalid curve marker is added.

[0047] Table 2 shows a complete curve obtained by the monitoring system. If the curve power value verification fails, the curve is stored in the monitoring system database with an invalid power curve flag added (the process will not be executed). Table 3 shows a complete power curve obtained by the monitoring system that passes the curve power value verification. In this case, the power curve is automatically stored in the database and synchronized to the remote control system. Table 4 shows a complete curve obtained by the monitoring system. If the curve power value verification fails initially, a power value verification failure event is reported. In this case, an invalid flag is added to the power curve data, and it is automatically stored in the database and synchronized to the remote control system. Subsequently, if sufficient information for power value verification is obtained and the power value verification passes, the invalid flag in the database for this power curve data will be updated.

[0048] Table 2

[0049]

[0050]

[0051] Table 3

[0052]

[0053] Table 4

[0054]

[0055] After the S400 remote control system starts, it resets the periodic data consistency flag by default, periodically retrieves the stored power curves from the monitoring system, and sets the periodic data consistency flag after retrieving all the power curves stored in the monitoring system.

[0056] The periodic data consistency flag is set to 0 by default. It is only set after the remote control system has acquired all the power curve data from the monitoring system. Only after the flag is set can the remote control system respond to the dispatch center's call for power curves.

[0057] S500 The dispatch center requests the power curve from the telecontrol system. The telecontrol system transmits the power curve to the dispatch center only when the requirements for periodic data consistency mark, data inconsistency count and imbalance mark are met.

[0058] After obtaining the power curve, the dispatch center compares it with the power curve sent to determine whether they are consistent. If they are inconsistent, it is determined that there is an anomaly.

[0059] If the dispatch center fails to receive the power curve within the specified time, it determines that the power curve data transmission or function is abnormal.

[0060] When the dispatch center requests curve data from the remote control system, the remote control system will only transmit curve data to the dispatch center if the periodic data consistency flag, the number of inconsistent data, and the imbalance flag all meet the conditions. Otherwise, it will not transmit the data. If the dispatch center does not receive the data within the specified time, it indicates that the power curve data transmission or function is abnormal, and it is necessary to contact the on-site operation personnel.

[0061] The dispatch center will request the power curve stored in the monitoring system database from the remote control system. When the conditions are met, the remote control system will transmit the power curve stored in the monitoring system to the dispatch center. The dispatch center will verify the correctness of the power curve. The whole process constitutes a closed-loop verification method, which can better prevent malfunctions in the power transmission of the DC transmission system.

[0062] A system for automatic power curve verification of DC transmission is provided, including a dispatch center, a monitoring system, and a remote control system.

[0063] The dispatch center sends the power curve to the remote control system, and the remote control system sets the inconsistency flag.

[0064] After the monitoring system receives the power curve from the remote control system, the remote control system clears the inconsistency marker and sets the imbalance marker. Upon receiving the power curve, the monitoring system determines its completeness. If the first or last point is missing, the curve is considered incomplete, discarded, and an alarm event is issued. The monitoring system verifies the power value of the curve. If the verification passes, the system stores the power curve, sends the curve data back to the remote control system, and clears the remote control system's imbalance marker. Otherwise, an alarm is triggered, the power curve is stored, and the curve data is sent back to the remote control system, clearing the remote control system's imbalance marker (manually storing the curve will also send the curve data back to the remote control system and clear the remote control system's imbalance marker for that curve).

[0065] After the remote control system is started, the periodic data consistency mark is cleared by default. It periodically retrieves the stored power curves from the monitoring system, and sets the periodic data consistency mark after retrieving all the power curves stored in the monitoring system once.

[0066] The dispatch center requests the power curve from the telecontrol system. The telecontrol system transmits the power curve to the dispatch center only when the requirements for periodic data consistency marker, data inconsistency count, and imbalance marker are all met.

[0067] The monitoring system compares each curve point by point according to the relationship between the curves in the power curve. If the deviation is greater than a set threshold, the verification fails.

[0068] Furthermore, the monitoring system compares each curve point by point based on the relationship between the curves in the power curve, including:

[0069] The corresponding points of the power-side curve are summed, and the difference is calculated with the corresponding points of the sum-power-side curve. If the difference at any point is greater than a set threshold, the verification fails.

[0070] If the dispatch center does not receive the power curve within the specified time, it determines that the power curve data transmission or function is abnormal.

[0071] The dispatch center obtains the power curve and compares it with the power curve sent to determine whether they are consistent. If they are inconsistent, it is determined that there is an anomaly.

[0072] This invention provides a comprehensive verification process before the automatic power curve is imported into the system, including curve integrity verification and power value verification. After verification, the curve is automatically loaded into the monitoring system database, which can meet the requirements of automatic power curve execution. On the other hand, the dispatch center can view the automatic power curve stored in the monitoring system database and compare the curves of the dispatch center and the converter station to avoid power misadjustment caused by inconsistencies between the two ends.

[0073] In summary, the embodiments of the present invention relate to a method and system for implementing automatic power curve comprehensive verification of DC transmission. The dispatch center sends power curves to the remote control system (RCS), which sets the inconsistency count. After the monitoring system obtains the power curves from the RCS, it clears the inconsistency flag and sets the imbalance flag for that curve. The monitoring system verifies the power value of the obtained power curves. If the verification passes, it stores the power curves and sends them back to the RCS, clearing the imbalance flag for that curve in the RCS; otherwise, the monitoring system alarms. Upon startup, the RCS defaults to clearing the periodic data consistency flag and periodically retrieves the stored power curves from the monitoring system. After retrieving all stored power curves, it sets the periodic data consistency flag. The RCS only supports the dispatch center's ability to retrieve the monitoring system's power curves when the periodic data consistency flag, the number of inconsistencies, and the imbalance flag all meet the requirements. This effectively reduces the workload of operators, improves work efficiency, and lowers work pressure.

[0074] It should be understood that the specific embodiments described above are merely illustrative or explanatory of the principles of the invention and do not constitute a limitation thereof. Therefore, any modifications, equivalent substitutions, improvements, etc., made without departing from the spirit and scope of the invention should be included within the protection scope of the invention. Furthermore, the appended claims are intended to cover all variations and modifications falling within the scope and boundaries of the appended claims, or equivalent forms of such scope and boundaries.

Claims

1. A method for realizing automatic power curve comprehensive calibration of direct current transmission, characterized in that, The method comprises the following steps: The dispatching center sends a power curve to the remote system, and the remote system sets an inconsistency flag; After the monitoring system obtains the power curve from the remote system, the remote system clears the inconsistency flag and sets an imbalance flag; The monitoring system checks the power value of the obtained power curve, and if the check is passed, the monitoring system stores the power curve and sends the curve data back to the remote system and clears the imbalance flag of the remote system, otherwise, the monitoring system alarms, stores the power curve and sends the curve data back to the remote system and clears the imbalance flag of the remote system; After the remote system is started, the periodic data consistency flag is cleared by default, the stored power curve is periodically obtained from the monitoring system, and after all the power curves stored in the monitoring system are obtained, the periodic data consistency flag is set; The dispatching center requests the remote system to obtain the power curve, and the remote system transmits the power curve to the dispatching center only when the periodic data consistency flag, the number of inconsistent data and the imbalance flag all meet the requirements; After the monitoring system receives the power curve, the completeness of the curve is judged, if the first point or the last point is missing, the curve is considered to be incomplete, the power curve is discarded, and an alarm event is issued; The monitoring system checks the power value of the power curve, which comprises: according to the relationship between each curve in the power curve, each curve is compared point by point, and if the deviation is greater than a set threshold, the check is failed, further, according to the relationship between each curve in the power curve, each curve is compared point by point, which comprises: the sum of the corresponding points of the power side curve, and the difference between the corresponding points of the sum power side curve, and if the difference of any point is greater than a set threshold, the check is failed.

2. The method according to claim 1, wherein, When the dispatching center does not receive the power curve within a specified time, it is determined that the power curve data transmission or function is abnormal.

3. The method according to any one of claims 1 to 2, wherein the method further comprises: After the dispatching center obtains the power curve, it is compared with the sent power curve to determine whether it is consistent, and if it is inconsistent, it is determined that there is an abnormality.

4. A system for implementing automatic power curve comprehensive calibration of direct current transmission, characterized in that, The method comprises the following steps: The dispatching center sends a power curve to the remote system, and the remote system sets an inconsistency flag; After the monitoring system obtains the power curve from the remote system, the remote system clears the inconsistency flag and sets an imbalance flag; The monitoring system checks the power value of the power curve, and if the check is passed, the monitoring system stores the power curve and sends the curve data back to the remote system and clears the imbalance flag of the remote system, otherwise, the monitoring system alarms, stores the power curve and sends the curve data back to the remote system and clears the imbalance flag of the remote system; After the remote system is started, the periodic data consistency flag is cleared by default, the stored power curve is periodically obtained from the monitoring system, and after all the power curves stored in the monitoring system are obtained, the periodic data consistency flag is set; The dispatching center requests the remote system to obtain the power curve, and the remote system transmits the power curve to the dispatching center only when the periodic data consistency flag, the number of inconsistent data and the imbalance flag all meet the requirements; The monitoring system receives the power curve, judges the integrity of the curve, considers that the curve is not complete if the first point or the last point is missing, discards the power curve, and issues an alarm event; The monitoring system compares each curve point by point according to the relationship between the curves in the power curve, and if the deviation is greater than the set threshold, the verification fails. Further, the monitoring system compares each curve point by point according to the relationship between the curves in the power curve, including: The sum of the corresponding points of the power side curve and the difference of the corresponding points of the sum power side curve, when the difference of any point is greater than the set threshold, the verification fails.

5. The system for realizing the automatic power curve comprehensive check of the direct current transmission according to claim 4, characterized in that, The dispatching center determines that the power curve data transmission or function is abnormal when the power curve is not received within the specified time.

6. The system for implementing the automatic power curve verification of the DC transmission according to any one of claims 4 to 5, characterized in that, The dispatching center compares the power curve with the issued power curve after obtaining the power curve, judges whether they are consistent, and determines that there is an abnormality if they are not consistent.

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