Method and system for measuring operation cost of primary frequency modulation of generator set

Abstract

The invention discloses a method for measuring the primary frequency modulation operation cost of a generator set, and the method comprises the steps: monitoring the operation conditions of the generator set under different working conditions, collecting the operation data under different working conditions, calculating the energy consumption under different working conditions according to the operation data under different working conditions, and comparing the power consumption and energy consumption data under different working conditions. The overall operation cost of the primary frequency modulation action of the hydroelectric generating set can be obtained, and the actual energy consumption consumed by the primary frequency modulation action of the generating set compared with other different working conditions is mastered.

Description

Technical Field

[0001] The invention belongs to the technical field of generator set operation cost measurement, and relates to a generator set primary frequency modulation operation cost measurement method and system. Background Art

[0002] With a high proportion of regional new energy access to weak power grids at the sending end and large-scale DC projects being transmitted outside, problems such as new energy fluctuations and DC failures have impacted the grid frequency, resulting in serious shortages in peak-shaving and frequency-regulating capabilities.

[0003] Primary frequency regulation refers to the automatic control process in which the control system of the units in the power grid automatically controls the increase or decrease of the active power of the units when the power grid frequency deviates from the rated value, limits the change of the power grid frequency, and maintains a stable power grid frequency.

[0004] The primary frequency regulation of hydropower units is a control method in which the hydropower station coordinates and adjusts the turbine and generator according to the load demand of the power grid to adjust the output active power. As an important power generation equipment in the power system, the primary frequency regulation function of the hydropower unit plays a vital role in maintaining the stability of the power grid frequency. Through the primary frequency regulation function of the hydropower unit, it can quickly respond to changes in the power grid frequency and adjust the output of active power in time, thereby maintaining the stability of the power grid frequency.

[0005] The process of hydropower units participating in primary frequency regulation is a process in which an automatic control system responds to grid frequency deviations. Its detailed steps and key points can be summarized as follows:

[0006] Frequency detection and deviation formation: When the grid frequency deviates from the rated value (usually 50Hz), the grid (unit) frequency (speed) signal is sent to the frequency (speed) input port of the hydropower unit speed control system; the rated value set inside the speed control system is compared with the received frequency (speed) given value to form a frequency (speed) deviation signal.

[0007] Speed ​​control system response and regulation: The speed control system automatically adjusts according to the frequency (speed) deviation signal. This adjustment process is mainly achieved by changing the guide vane opening of the turbine, thereby adjusting the output power of the turbine. The primary frequency regulation load response lag time should be less than 2 seconds, that is, the time required from the grid frequency change to the primary frequency regulation action value to the unit load starting to change.

[0008] Load adjustment and frequency stabilization: Through the adjustment of the speed control system, the output power of the hydropower unit will change, thereby adjusting the load of the power grid to balance it with the external load. This process helps to reduce the change of the power grid frequency, gradually restore the power grid frequency to the rated value, and reach a stable state.

[0009] From the above-mentioned process of sequential frequency regulation of hydropower units, it can be seen that the participation of hydropower units in primary frequency regulation will increase costs such as fuel consumption and mechanical losses. However, there is currently no feasible method to measure the actual energy consumption of the primary frequency regulation operation of hydropower units, and it is impossible to propose targeted improvement measures for the existing energy consumption, which affects the overall operation performance of the power grid.

[0010] Therefore, it is necessary to measure the voltage and current on the secondary side of the generator set through on-site tests, monitor the guide vane adjustment action, test the oil pressure status in the speed control system oil tank, start the air replenishment process of the automatic air replenishment device, etc., and calculate the impact of the primary frequency regulation of the generator set on the economic operation of the unit. Summary of the invention

[0011] The purpose of the present invention is to solve the problem that the participation of hydropower units in primary frequency regulation in the prior art will increase costs such as fuel consumption and mechanical losses, but there is currently no feasible method to measure the actual energy consumption of the primary frequency regulation operation of the hydropower units, and it is impossible to propose targeted improvement measures for the existing energy consumption, which affects the performance of the overall operation of the power grid. A method and system for measuring the primary frequency regulation operation cost of a generator set are provided.

[0012] In order to achieve the above object, the present invention adopts the following technical solutions:

[0013] A method for measuring the primary frequency regulation operation cost of a generator set comprises the following steps:

[0014] Collect operating data of generator sets under different working conditions;

[0015] Based on the operating data under different working conditions, calculate the power consumption and energy consumption data of the generator set under different working conditions;

[0016] The power and energy consumption data under different working conditions are compared and calculated to obtain the actual value of the primary frequency regulation operating cost of the generator set.

[0017] A further improvement of the present invention is:

[0018] The operation data of the generator set under different working conditions are collected as follows:

[0019] Adjust the generator set to different working conditions for operation test and record the operating data of the generator set during the operation.

[0020] The different operating conditions include:

[0021] Monitor the system's active power regulation, unit primary frequency regulation and unit normal operation.

[0022] When the system is actively regulated, the unit regulation includes the following steps:

[0023] Send instructions through the central control room monitoring system to set the load value. The load value increases by 20MW each time. When the unit increases the load to the rated load, it decreases by 20MW each time until the load is reduced to 0MW.

[0024] Or send instructions through the central control room monitoring system to increase the unit output by 50MW, and then reduce the output by 50MW after the operation is stable.

[0025] When the unit is adjusted once, the unit adjustment includes the following steps:

[0026] The unit is assumed to have variable load conditions and to be connected to the grid and run at a certain stable load;

[0027] Switch the speed regulator to manual;

[0028] Disconnect the frequency measuring terminal of the speed regulator and connect the output frequency signal terminal of the tester to the terminal of the frequency measuring terminal;

[0029] Stabilize the frequency conversion signal at 50Hz. When the unit is running stably, the speed regulator switches to automatic operation and sets the opening limit to 80%;

[0030] Use the tester to send out disturbance signals, change the frequency of the signals one by one, and record the governor PID output, main servomotor output and unit power during the entire disturbance process;

[0031] After each adjustment is stable, repeat the above steps to conduct the disturbance test of the next set of data.

[0032] When the unit is operating normally, the unit adjustment includes the following steps:

[0033] The unit is running under load and the primary frequency regulation function of the speed regulation system is put into operation.

[0034] The operation data include grid frequency, unit power, opening degree and oil pressure of the hydraulic system oil pump, oil pressure operation time of the hydraulic system oil pump and oil pressure operation frequency of the hydraulic system oil pump.

[0035] A system for measuring the primary frequency regulation operation cost of a generator set, comprising:

[0036] Data acquisition module, used to collect operating data of the generator set under different working conditions;

[0037] The power consumption and energy consumption calculation module is used to calculate the power consumption and energy consumption data of the generator set under different working conditions based on the operating data under different working conditions;

[0038] The operating cost acquisition module is used to compare and calculate the power consumption and energy consumption data under different working conditions to obtain the actual value of the primary frequency regulation operating cost of the generator set.

[0039] A terminal device comprises a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of any method described in the present invention when executing the computer program.

[0040] A computer-readable storage medium stores a computer program, wherein the computer program, when executed by a processor, implements the steps of any method described in the present invention.

[0041] Compared with the prior art, the present invention has the following beneficial effects:

[0042] The present invention discloses a method for measuring the primary frequency regulation operation cost of a generator set. The method monitors the operation of the generator set under different working conditions, collects the operation data under different working conditions, calculates the energy consumption under different working conditions according to the operation data under different working conditions, and compares the power consumption and energy consumption data under different working conditions. The method can compare the overall operation cost of the primary frequency regulation of new energy and hydropower units, grasp the actual energy consumption consumed by the primary frequency regulation of the generator set compared with other different working conditions, and facilitate the later proposal of targeted improvement measures for the performance of the unit, improve the improvement measures, and affect the performance of the overall operation of the power grid. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0044] Figure 1 It is a flow chart of the present invention. DETAILED DESCRIPTION

[0045] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0046] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0047] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0048] In the description of the embodiments of the present invention, it should be noted that if the terms "upper", "lower", "horizontal", "inner", etc. indicate an orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the invention is usually placed when in use, it is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0049] In addition, if the term "horizontal" appears, it does not mean that the component must be absolutely horizontal, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", which does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0050] In the description of the embodiments of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0051] The present invention is further described in detail below in conjunction with the accompanying drawings:

[0052] See also Figure 1 The embodiment of the present invention discloses a method for measuring the operating cost of primary frequency regulation of a generator set. By measuring the voltage and current on the secondary side of the generator set, monitoring the guide vane adjustment action, testing the oil pressure state in the oil tank of the speed regulation system, and starting the air replenishment process of the automatic air replenishment device, the power, opening, and hydraulic system oil pump operating data of the generator set under different test conditions are screened out, and the operating time and operating frequency of the hydraulic system oil pump of the generator set under different test conditions are counted. The impact of the primary frequency regulation of the generator set on the economic operation of the unit is calculated. This method proposes a method for measuring the operating cost of the primary frequency regulation of a generator set, obtains the overall operating cost of the primary frequency regulation action of the hydropower unit, and improves the overall economic benefits of the power grid.

[0053] The specific steps include:

[0054] Step 1: Collect the operating data of the generator set under different working conditions;

[0055] The different working conditions in this step include:

[0056] Monitor the system's active power regulation, primary frequency regulation of hydropower units and normal operation of the units.

[0057] The specific testing of different working conditions includes the following steps:

[0058] The test steps of the active power regulation of the monitoring system are as follows:

[0059] There are two situations:

[0060] First case:

[0061] The central control room monitoring system issues commands, and the load value is given, increasing by 20MW each time. The unit increases the load to the rated load, and then reduces the load to 0MW in the same way.

[0062] Second case:

[0063] When the unit is operating in stable condition, the output will increase by 50MW, and after stabilization, the output will decrease by 50MW.

[0064] The test steps of the active power regulation of the monitoring system are as follows:

[0065] (1) The unit has variable load conditions and is connected to the grid and operates at a certain stable load (such as around 60%, 75%, or 90% load).

[0066] (2) The speed regulator is switched to manual mode;

[0067] (3) Disconnect the machine frequency measurement terminal and introduce the output frequency signal terminal of the tester into the machine frequency measurement terminal (maintenance);

[0068] (4) Stabilize the frequency conversion signal at 50Hz to confirm that the unit is running stably. When all safety measures are in place, the speed governor switches to automatic operation and sets the opening limit to 80%;

[0069] (5) Change the frequency of the frequency conversion signal step by step, the change process is: 50→49.85→50→50.15→50. Record the speed regulator PID output, main relay output, unit power and other signals during the entire disturbance process. Note that the test recording starts before the frequency disturbance; the next disturbance test is carried out after each adjustment is stable;

[0070] In the above test, the present invention uses the tester to send an actual grid frequency disturbance signal, conducts an actual grid frequency disturbance test, and records the entire disturbance process. After a set of data is recorded, the speed regulator adjustment parameters are modified to another set of parameters, and the above steps are repeated to test multiple sets of data.

[0071] Energy consumption test of normal operation of the unit:

[0072] The unit is running under load, and the frequency regulation function of the speed regulation system is put into operation once, and various operating data of the unit are tested for a period of time.

[0073] Step 2: Based on the operating data under different working conditions, calculate the power consumption and energy consumption data of the generator set under different working conditions;

[0074] The data collected are the measurement points see Table 1:

[0075] Appendix 1 Test point layout

[0076]

[0077]

[0078] Step 3: Compare and calculate the power consumption and energy consumption data under different working conditions to obtain the actual value of the primary frequency regulation operation cost of the generator set.

[0079] Among the tested data, the power, opening, and hydraulic system oil pump operation data when the unit is normally started and running without a monitoring system and a single frequency regulation are screened out. The working time, operating frequency and other related information of the hydraulic system oil pump when each unit is not adjusted are counted, the power consumption of the computer unit's oil pump hydraulic system during normal operation is calculated, and relevant tables and graphs are drawn.

[0080] Among the tested data, the operating conditions when the unit is normally started and operates normally without a frequency modulation action are screened out, as well as the power, opening, and hydraulic system oil pump operating data of the unit. The working time, operating frequency and other related information of the hydraulic system oil pump when the unit is not adjusted are counted. The power consumption of the computer group during normal operation is calculated and relevant tables and graphs are drawn.

[0081] Among the tested data, the operating conditions when the unit is normally started and runs normally with only one frequency modulation response action are screened out, and the power, opening, and hydraulic system oil pump operating data of the unit are selected. The working time, operating frequency and other related information of the hydraulic system oil pump when the unit is not adjusted are counted, and the power consumption of the oil pump caused by one frequency modulation action is calculated in combination with the parameter information on the oil pump nameplate.

[0082] This embodiment also discloses a system for measuring the primary frequency regulation operation cost of a generator set, including:

[0083] Data acquisition module, used to collect operating data of the generator set under different working conditions;

[0084] The power consumption and energy consumption calculation module is used to calculate the power consumption and energy consumption data of the generator set under different working conditions based on the operating data under different working conditions;

[0085] The operating cost acquisition module is used to compare and calculate the power consumption data under different working conditions to obtain the actual value of the primary frequency regulation operating cost of the generator set.

[0086] An embodiment of the present invention discloses a terminal device, which includes: a processor, a memory, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the steps in the above-mentioned method embodiments are implemented. Alternatively, when the processor executes the computer program, the functions of the modules / units in the above-mentioned device embodiments are implemented.

[0087] The computer program may be divided into one or more modules / units, and the one or more modules / units are stored in the memory and executed by the processor to accomplish the present invention.

[0088] The terminal device may be a computing device such as a desktop computer, a notebook, a PDA, a cloud server, etc. The terminal device may include, but is not limited to, a processor and a memory.

[0089] The processor can be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc.

[0090] The memory may be used to store the computer programs and / or modules, and the processor implements various functions of the terminal device by running or executing the computer programs and / or modules stored in the memory and calling the data stored in the memory.

[0091] If the module / unit integrated in the terminal device is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the present invention implements all or part of the processes in the above-mentioned embodiment method, and can also be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a computer-readable storage medium, and the computer program can implement the steps of the above-mentioned various method embodiments when executed by the processor. Among them, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, U disk, mobile hard disk, disk, optical disk, computer memory, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), electric carrier signal, telecommunication signal and software distribution medium. It should be noted that the content contained in the computer-readable medium can be appropriately increased or decreased according to the requirements of legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, computer-readable media do not include electric carrier signals and telecommunication signals.

[0092] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for measuring the primary frequency regulation operation cost of a generator set, characterized in that: The following steps are involved: Collect operating data of generator sets under different working conditions; Based on the operating data under different working conditions, calculate the power consumption and energy consumption data of the generator set under different working conditions; The power and energy consumption data under different working conditions are compared and calculated to obtain the actual value of the primary frequency regulation operating cost of the generator set.

2. A method for measuring the primary frequency regulation operation cost of a generator set according to claim 1, characterized in that: The operation data of the generator set under different working conditions are collected as follows: Adjust the generator set to different working conditions for operation test and record the operating data of the generator set during the operation.

3. A method for measuring the primary frequency regulation operation cost of a generator set according to claim 1, characterized in that: The different operating conditions include: Monitor the system's active power regulation, unit primary frequency regulation and unit normal operation.

4. A method for measuring the primary frequency regulation operation cost of a generator set according to claim 3, characterized in that: When the system is actively regulated, the unit regulation includes the following steps: Send instructions through the central control room monitoring system to set the load value. The load value increases by 20MW each time. When the unit increases the load to the rated load, it decreases by 20MW each time until the load is reduced to 0MW. Or send instructions through the central control room monitoring system to increase the unit output by 50MW, and then reduce the output by 50MW after the operation is stable.

5. A method for measuring the primary frequency regulation operation cost of a generator set according to claim 3, characterized in that: When the unit is adjusted once, the unit adjustment includes the following steps: The unit is assumed to have variable load conditions and to be connected to the grid and run at a certain stable load; Switch the speed governor to manual; Disconnect the frequency measuring terminal of the speed regulator and connect the output frequency signal terminal of the tester to the terminal of the frequency measuring terminal; Stabilize the frequency conversion signal at 50Hz. When the unit is running stably, the speed regulator switches to automatic operation and sets the opening limit to 80%; Use the tester to send out disturbance signals, change the frequency of the signals one by one, and record the governor PID output, main servomotor output and unit power during the entire disturbance process; After each adjustment is stable, repeat the above steps to conduct the disturbance test of the next set of data.

6. A method for measuring the primary frequency regulation operation cost of a generator set according to claim 3, characterized in that: When the unit is operating normally, the unit adjustment includes the following steps: The unit is running under load and the primary frequency regulation function of the speed regulation system is put into operation.

7. A method for measuring the primary frequency regulation operation cost of a generator set according to claim 3, characterized in that: The operation data include grid frequency, unit power, opening degree and oil pressure of the hydraulic system oil pump, oil pressure operation time of the hydraulic system oil pump and oil pressure operation frequency of the hydraulic system oil pump.

8. A system for measuring the primary frequency regulation operation cost of a generator set, characterized in that: include: Data acquisition module, used to collect operating data of the generator set under different working conditions; The power consumption and energy consumption calculation module is used to calculate the power consumption and energy consumption data of the generator set under different working conditions based on the operating data under different working conditions; The operating cost acquisition module is used to compare and calculate the power consumption and energy consumption data under different working conditions to obtain the actual value of the primary frequency regulation operating cost of the generator set.

9. A terminal device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 7 are implemented.

10. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 7 are implemented.

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