A strategy table configuration method based on standardized safety and stability control device

Abstract

The present invention discloses a strategy table configuration method based on a standardized safety and stability control device, the method comprising: according to the scale and configuration of the target stability control system, using simulation calculation to obtain an offline strategy table, and clarifying the strategy functions of the main station, substation and execution station of the stability control system; according to the strategy functions and station channel configuration of the main station, substation and execution station of the stability control system, determining the system components that need to be exchanged between the stations; instantiating the system components sent by each substation of the stability control system, and sequentially configuring the system section, operation mode, fault type, control measures and strategy items according to the offline strategy table to form a control strategy table for the entire stability control system; the main station device of the stability control system makes a judgment according to the control strategy table of the stability control system, and when a certain strategy item is satisfied, the stability control system executes the control measures according to the item.

Description

Technical Field

[0001] The invention relates to a strategy table configuration method based on a standardized safety and stability control device, and belongs to the technical field of power grid safety and stability control. Background Art

[0002] With the continuous construction and development of the power grid, the safety and stability control device, as the second line of defense of the power system, plays an increasingly important role in the safe and stable operation of the power grid. While the safety and stability control device is widely used, the problems of inconsistent and non-standard design methods such as configuration principles and criteria of devices from different manufacturers are becoming increasingly prominent, which brings great difficulties to the operation and maintenance management of the device and also brings certain risks to the operation of the power grid. The standardized design of the safety and stability control device solves the above problems well. The standardized safety and stability control device not only achieves the unified design of the pressure plate, interface, and set value, but also the devices of different manufacturers can be interconnected according to the standardized station communication protocol.

[0003] The safety and stability control system (referred to as the stability control system) is a system composed of safety and stability control devices of two or more power plants connected by communication equipment to achieve stability control of regional or larger power systems. The current mainstream implementation method of the stability control strategy is to carry out simulation calculations through offline simulation software tools to obtain a strategy table based on the expected accident set, and then hand over the strategy table to the developers of the stability control device manufacturer for programming or configuration implementation. The power grid structure in different regions is different, the stability problems are different, and the corresponding strategy tables are also different. Developers need to perform software programming or modify configurations for different strategy tables to implement different stability control system strategies. Whether it is software programming or modifying strategy configurations for non-standardized safety and stability control devices, the workload of developers is large, and the corresponding testing work is also cumbersome. The safety and reliability of the implementation of the stability control system strategy is related to the level of developers and testers. The entire stability control system development cycle is long and the cost is high. Summary of the invention

[0004] The purpose of the present invention is to provide a strategy table configuration method based on a standardized safety and stability control device to solve the defects of large workload in developing a strategy table for a stability control system and cumbersome corresponding testing work.

[0005] A strategy table configuration method based on a standardized safety and stability control device, the method comprising:

[0006] According to the target stability control system scale and configuration, the offline strategy table is obtained by simulation calculation, and the strategy functions of the main station, substation and execution station of the stability control system are clarified;

[0007] According to the strategic functions and inter-station channel configuration of the main station, substation and execution station of the stability control system, determine the system components that need to be exchanged between stations;

[0008] Instantiate the system components sent from each substation of the stability control system, and configure the system sections, operation modes, fault types, control measures and strategy items in sequence according to the offline strategy table to form the control strategy table of the entire stability control system;

[0009] The main station device of the stabilization control system makes judgments based on the control strategy table of the stabilization control system. When a certain strategy item is met, the stabilization control system executes control measures according to the item.

[0010] Furthermore, the system component instantiation method is:

[0011] Each system component sent by the substation according to the inter-station communication protocol is associated one by one with the system components designed in the main station device. The substation sends the system component data in a pre-agreed arrangement order. The main station parses the data in the same arrangement order and associates the data with the system components of the main station. The arrangement order of the system components is: first the system components collected locally by the substation, then the system components sent by the lower-level substation cascaded to the substation, and finally the system components collected by the cutting machine execution station connected to the substation.

[0012] Furthermore, the configuration of the system section includes determining the number and sources of system components constituting the section, the source of each system component is determined by the substation number and the sequence number of the queue in which the system component is sent to the substation, the system components may have one or two sources, and the system components from the two sources are set with start-stop criteria, tripping criteria and power value taking rules.

[0013] Furthermore, the two-source section system component startup and shutdown criteria are: if both sides of the system component are judged to be in operation, then the system component is considered to be in operation; if only one side is judged to be in operation, then the system component is considered to be out of operation.

[0014] Furthermore, the tripping criterion of the section system components of the two sources is: if only one side of the system component is judged to be tripped, the system component is considered to be tripped.

[0015] Furthermore, the principle of selecting the power of the cross-section system components from two sources is: the power of the side with the larger absolute value of the power on both sides of the system component is taken as the power of the system component, and participates in the subsequent logic;

[0016] If the section system component has only one source, that is, only one side has data sent up, then the section system component uses the shutdown, tripping judgment results and power of that side.

[0017] Furthermore, the configuration operation mode includes: determining the number of automatically identified operation modes, the automatic identification operation mode logic is put into use after the hard pressure plate cannot identify the operation mode, and the number of system components that are under maintenance or out of operation in the system section, forming a preset stabilization control system automatic identification operation mode.

[0018] Furthermore, configuring the fault patterns includes: determining the number of fault patterns, determining the system section corresponding to each fault pattern and the number of faulty system components in the system section.

[0019] Furthermore, the configuration control measures include: determining the type of control measures, the control measures include load cutting capacity command, unit cutting capacity command, new energy cutting capacity command, DC capacity increase / reduction command, DC valve group locking command, DC island operation command, and substation line decoupling command.

[0020] Furthermore, the configuration strategy entries include: based on an offline control strategy table obtained through simulation calculation, each control strategy in the offline control strategy table is instantiated as a strategy entry, and each strategy entry is configured as follows: under the configuration operation mode, if a configuration failure type occurs, then refer to the power of the configuration system section and execute the corresponding control measure in the configuration control measure.

[0021] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: the strategy table configuration method in the present invention is based on a standardized safety and stability control device, the strategy table structure is simple in design, and the configuration method is convenient. For different stability control systems, there is no need to modify the device software program, only the strategy table file needs to be modified to achieve customized stability control system development, which can significantly improve the development efficiency of the stability control system, shorten the project cycle, and reduce manpower and time costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is an overall flow chart of the strategy table configuration method of the present invention.

[0023] Figure 2 A schematic diagram of geographical location wiring of a test system according to an embodiment of the present invention.

[0024] Figure 3 Schematic diagram of inter-station communication of a test system stabilization control system according to an embodiment of the present invention.

[0025] Figure 4 This is a screenshot of a policy table after the test system configuration is completed according to an embodiment of the present invention. DETAILED DESCRIPTION

[0026] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0027] Example 1

[0028] like Figure 1As shown, a strategy table configuration method based on a standardized safety and stability control device is disclosed. This method is based on a safety and stability control device of standardized design. The system components sent by each substation of the safety and stability control system are instantiated using XML language. Then, the system section, operation mode, fault type, control measures and strategy items are configured according to the pre-calculated stability control strategy, thereby forming a control strategy table for the entire system. After the stability control master station device reads the strategy table, it periodically scans each strategy item. When a certain strategy item is satisfied, the stability control system executes according to the control measures of the item. Specifically, the following steps are included:

[0029] S1. Be familiar with the scale of the target system and the configuration of the stability control system to be implemented, analyze the offline strategy table obtained through simulation calculation, and clarify the strategy functions of the main station, substation and execution station of the stability control system;

[0030] S2. According to the strategic functions of the main station, substation and execution station of the stabilization control system and the channel configuration between the stations of the stabilization control system, determine the system components to be exchanged between the stations and their arrangement order;

[0031] S3. Use extensible markup language to configure the policy table, configure the substations connected to the stabilization control master station, specify the number of substations, and instantiate all system components sent by each substation, that is, associate each system component sent by the substation according to the inter-station communication protocol with the system components designed in the master station device one by one. The substation sends the system component data in the pre-agreed arrangement order, and the master station parses the data in the same arrangement order and associates the data with the system components of the master station;

[0032] S4. Configure the system section, clarify the number of system sections, determine the number and source of system components contained in each system section, the system components come from the stabilization substation configured in step S3, configure the substation number corresponding to the system component and the sequence number of the substation system component sending queue, the information of the system component may be collected and sent at the substations on both sides, and the system components of the section may have two sources during configuration, and set the shutdown judgment criteria, tripping judgment criteria and power value rules of the system components with two sources;

[0033] S5. Configure the operation mode, determine the number of automatically distinguished operation modes, and the automatic distinguishing operation mode logic is put into use after the hard pressure plate cannot distinguish the operation mode. For the system section configured in step S4, set the number of system components that are overhauled or out of operation in the system section to form a preset automatic distinguishing operation mode of the stability control system;

[0034] S6. configure the fault type, determine the number of fault types, determine the system section corresponding to each fault type and the number of faulty system components in the system section;

[0035] S7. Configure control measures and determine the types of control measures, which include load shedding capacity command, unit shedding capacity command, new energy shedding capacity command, DC capacity increase / reduction command, DC valve block command, DC island operation command, substation line decoupling command, etc.

[0036] S8, configure strategy entries, according to the offline control strategy table obtained by simulation calculation, instantiate each control strategy in the offline control strategy table as a strategy entry, each strategy entry is configured as follows: in the operation mode configured in step S5, if the fault type configured in step S6 occurs, refer to the system section power configured in step S4, and finally execute the control measures configured in step S7;

[0037] S9. The stabilization and control main station device is powered on to read the strategy table configured according to the above method, and periodically scans the current operating mode of the system and whether the expected fault type has occurred. When both the operating mode and the fault type are met, the power threshold of the reference system section specified in the strategy entry is referred to, and the control measures configured in the strategy entry are executed, and the control command is sent to the stabilization and control substation or the stabilization and control execution station execution exit.

[0038] Embodiment 2:

[0039] Figure 2 This is a schematic diagram of the geographical location wiring of a primary system of a test system. The sending-end stability control system consists of the main station 1 and substation 4 installed in the 1# substation, the substation 1 and execution station 3 installed in the sending-end converter station, the substation 2 (machine cut-off) and execution station 1 installed in the 2# substation, and the substation 3 and execution station 4 installed in the 3# substation. The receiving-end stability control system consists of the main station 2 installed in the 5# substation, the execution station 5 installed in the receiving-end converter station, the execution station 6 installed in the 6# substation, and the execution station 7 installed in the receiving-end conventional power plant. Among them, 1~5# are 500kV substations, and 6# is a 220kV substation. The configuration process of the sending-end stability control master station device strategy table is explained below using the sending-end stability control system as an example.

[0040] Step S1, after being familiar with the scale and configuration of the sending-end stabilization control system, analyze the strategy functions of each plant and station of the stabilization control system and the offline strategy table of the stabilization control system. The main strategies of each plant and station of the sending-end stabilization control system are shown in Table 1, and the offline strategy table (part) of the stabilization control system is shown in Table 2.

[0041] Table 1- Plant and station strategy functions of the sending end stabilization control system

[0042]

[0043] Table 2-Offline strategy table of the sending end stabilization system (partial)

[0044]

[0045]

[0046] Step S2, according to the strategic functions of each plant and station of the stabilization and control system and the channel configuration between each plant and station, determine the system components and their arrangement order that need to be exchanged between each plant and station. This embodiment focuses on describing the system components and commands exchanged between each stabilization and control substation and the stabilization and control main station. The system components sent by each stabilization and control substation are sent in the order agreed upon in advance by the main station and the substation (see Table 3).

[0047] Table 3- Configuration table of components of the stable control master station receiving substation uploading system

[0048]

[0049]

[0050] Step S3 configures the strategy table. First, configure the connected stable control substation. Since the system components of substation 3 are sent to the main station through substation 4 in cascade, the main station does not directly access substation 3. The number of substations connected to the main station is 3. Since the system components sent from the substation to the main station are not self-descriptive, the order of sending the system components of each substation can be agreed in advance. The main station then instantiates the received substation system components in this order, and associates each system component sent by the substation according to the inter-station communication protocol with the system component designed in the main station device one by one. The standardized design of the stable control substation to send the stable control main station communication protocol is shown in Table 4.

[0051] The system components sent to the substation may include line components, main transformer components, and unit components.

[0052] In this embodiment, the order in which each stabilization substation sends system components is as follows:

[0053] ① Substation 1 channel: 3 Section I line elements collected locally at Substation 1 (the arrangement order of line elements is determined by the developer’s configuration in advance);

[0054] ②Substation 2 channel: 2 Section II line components collected locally at Substation 2, 2 main transformer components of 2# substation, and 6 unit components sent from the generator cutting execution station 1;

[0055] ③Substation 4 channel: 7 section line elements collected locally by substation 4, 2 line elements sent from lower-level substation 3 and 2 main transformer elements of 3# substation.

[0056] Table 4- Communication protocol of the stable control substation to the stable control main station

[0057]

[0058]

[0059] Step S4 configures the system section. In this embodiment, the stabilization control system sets three sections. Section I contains three line elements, and Section II and Section III each contain two line elements. All seven line elements of the three sections are collected and sent to the substations on both sides of the line, so all line elements have two sources. For example, Section I Line 1, the first source is the first system element sent from substation 1, and the second source is the first system element sent from substation 4. Other line elements also have two sources, which will not be repeated.

[0060] The criterion for the operation and shutdown of Section Ⅰ Line 1 is: Section Ⅰ Line 1 is considered to be in operation only when the first system component sent from substation 1 and the first system component sent from substation 4 are both judged to be in operation. If only one is judged to be in operation, Section Ⅰ Line 1 is still considered to be out of operation.

[0061] The tripping criterion of Section I Line 1 is: if either the first system element sent from Substation 1 or the first system element sent from Substation 4 trips, it is considered that the Section I Line 1 element has tripped.

[0062] The principle for selecting the power value of Section I Line 1 is: the power with the larger absolute value between the first system element sent from Substation 1 and the first system element sent from Substation 4 is taken as the power of Section I Line 1 and is involved in the subsequent logic.

[0063] If Section I Line 1 is a single source, that is, only one side has a substation to collect and upload data, then Section I Line 1 uses the shutdown and tripping judgment results and power on that side.

[0064] Step 5: Configure the operation mode. The stabilization control system of this embodiment is set with two operation modes. Both operation modes are configured based on Section I. All three line components of Section I are put into operation, and the number of overhauls of line components of Section I is 0. This is considered to be the normal operation mode, i.e., Mode I. One of the three line components of Section I is overhauled, and the number of overhauls of line components of Section I is 1. This is considered to be the single-line overhaul mode of Section I, i.e., Mode II. The automatic operation mode identification logic is put into use after the hard pressure plate cannot identify the system operation mode. When configuring the strategy table, the section object and the number of overhauls of the section system components must be clearly defined.

[0065] Step 6 configures the fault type. In this embodiment, the offline strategy table of the stabilization control system proposes three fault types, namely, section ⅠN-2 fault, section ⅡN-2 fault and section ⅠN-1 fault. When configuring the strategy table, it is necessary to specify the section object and the number of system components that send faults in the section. For example, for section ⅡN-2 fault, it is configured that two line components in section Ⅱ have faults.

[0066] Step 7 configures control measures. The control measures for the stabilization system include load shedding, cutting off new energy units, cutting off conventional units, increasing or reducing DC power, locking DC valve group commands, issuing DC system island operation commands, etc. The stabilization control measures involved in this embodiment are all cutting units and reducing DC power.

[0067] Step 8 configures the policy entries. According to the established offline policy table, each control policy in the offline policy table is instantiated as a policy entry. In this embodiment, three control policy entries can be configured according to the method of the present invention, which are:

[0068] ① In "Mode 1", when "Section ⅠN-2 fault" occurs, refer to system section Ⅰ and execute "cut off the unit and reduce the DC power";

[0069] ② In "Mode 1", if "Section ⅡN-2 fault" occurs, refer to system section Ⅱ and execute "cut off the unit and reduce the DC power";

[0070] ③ In "Mode 2", when "Section ⅠN-1 fault" occurs, refer to system section Ⅰ and execute "cut off the unit and reduce the DC power";

[0071] Step 9: The stabilization and control main station device is powered on to read the policy table configured by the above method, and periodically scans the current operating mode of the system and whether the preset fault type occurs. When both the operating mode and the fault type are met, refer to the power threshold of the system section specified by the policy entry, execute the control measures configured by the policy entry, and send control commands to the stabilization and control substation or execution station execution exit.

[0072] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A strategy table configuration method based on a standardized safety and stability control device, characterized in that: The method comprises: Obtain the offline strategy table based on the target stability control system scale and configuration calculation, and clarify the strategy functions of the stability control system master station, substation and execution station; According to the strategic functions and inter-station channel configuration of the main station, substation and execution station of the stability control system, determine the system components that need to be exchanged between stations; Instantiate the system components sent from each substation of the stability control system, and configure the system sections, operation modes, fault types, control measures and strategy items in sequence according to the offline strategy table to form the control strategy table of the entire stability control system; The main station device of the stability control system makes a judgment based on the control strategy table of the stability control system. When a certain strategy item is met, the stability control system executes the control measures according to the item; The system component instantiation method is: Each system component sent by the substation according to the inter-station communication protocol is associated with the system components designed in the master station device one by one. The substation sends the system component data according to the pre-agreed arrangement order. The master station parses the data according to the same arrangement order and associates the data with the system components of the master station. The arrangement order of the system components is: first the system components collected locally by the substation, then the system components sent by the lower substation cascaded to the substation, and finally the system components collected by the cutting execution station connected to the substation; The configuration of the system section includes determining the number and sources of the system components constituting the section, wherein the source of each system component is determined by the substation number and the sequence number of the substation system component sending queue, and the system components have one or two sources, and the system components of the two sources are set with the start-stop judgment criteria, the tripping judgment criteria and the power value rules; The principle of power value selection of the cross-section system components from two sources is: the power of the side with the larger absolute value of the power on both sides of the system component is taken as the power of the system component, and it participates in the subsequent logic; If the section system component has only one source, that is, only one side has data sent up, then the section system component uses the shutdown, tripping judgment results and power of that side.

2. The strategy table configuration method based on the standardized safety and stability control device according to claim 1 is characterized in that: The judgment criteria for the operation and shutdown of the section system components from two sources are as follows: if both sides of the system component are judged to be in operation, then the system component is considered to be in operation; if only one side is judged to be in operation, then the system component is considered to be out of operation.

3. The strategy table configuration method based on the standardized safety and stability control device according to claim 1 is characterized in that: The tripping criterion for the section system components of two sources is: if only one side of the system component is judged to be tripped, the system component is considered to be tripped.

4. The strategy table configuration method based on the standardized safety and stability control device according to claim 1 is characterized in that: The operating mode includes: determining the number of automatically identified operating modes, the automatic identification operating mode logic is put into use after the hard pressure plate cannot identify the operating mode, and the number of system components that are under maintenance or out of operation in the system section to form a preset automatic identification operating mode of the stabilization control system.

5. The strategy table configuration method based on the standardized safety and stability control device according to claim 1 is characterized in that: The fault pattern includes: determining the number of fault patterns, determining the system section corresponding to each fault pattern and the number of faulty system components in the system section.

6. The strategy table configuration method based on the standardized safety and stability control device according to claim 1 is characterized in that: The control measures include: determining the type of control measures, the control measures include load capacity cutting command, unit capacity cutting command, new energy capacity cutting command, DC capacity increase / reduction command, DC valve group locking command, DC island operation command, and substation line decoupling command.

7. The strategy table configuration method based on the standardized safety and stability control device according to claim 1 is characterized in that: The strategy entries include: according to the offline control strategy table obtained by simulation calculation, each control strategy in the offline control strategy table is instantiated as a strategy entry, and each strategy entry is configured as follows: under the configuration operation mode, if a configuration failure type occurs, refer to the power of the configuration system section and execute the corresponding control measure in the configuration control measure.

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