Hydropower station automatic voltage control and unit reactive PID adjustment method, system and device and medium

Abstract

The invention discloses a hydropower station automatic voltage control and unit reactive PID adjustment method, system and device and a medium, and the method comprises the steps: obtaining a hydropower station bus voltage value, and obtaining a bus voltage adjustment completion or adjustment non-completion signal according to the bus voltage value; a bus voltage regulation completion or non-completion signal and an automatic voltage control input or quit state signal are sent to a unit reactive PID (Proportion Integration Differentiation) module; and based on the bus voltage regulation signal and the automatic voltage control signal, the unit reactive PID module executes closed-loop regulation or open-loop regulation. According to the invention, bus voltage is monitored in real time to obtain a regulation state signal, and the regulation state signal is transmitted to a unit reactive PID module through automatic voltage control; the unit reactive PID module executes closed-loop or open-loop adjustment according to the signal, so that excessive adjustment and oscillation can be avoided, adjustment requirements can be timely responded, reactive power can be accurately adjusted, and the operation stability and efficiency of a power system of a hydropower station can be improved.

Description

Technical Field

[0001] The invention relates to the technical field of power control of a hydropower station, and in particular to a method, system, equipment and medium for automatic voltage control and unit reactive PID regulation of a hydropower station. Background Art

[0002] In the context of the booming power industry today, the stability and reliability of power supply are crucial to the stable operation of the social economy. As an important part of the power supply, the efficient and stable operation of hydropower stations is directly related to the power supply quality of the region and even the entire power grid. With the continuous expansion of the scale of the power grid and the growing demand for electricity, hydropower stations need more precise and intelligent control technologies to ensure the stability of power production. The application of automatic voltage control (AVC) and unit reactive PID regulation technology in hydropower stations has become a key means to achieve this goal. They are of great significance for maintaining bus voltage stability and optimizing unit reactive power output. They play an irreplaceable role in ensuring the quality of power grid voltage and improving the operating efficiency of the power system.

[0003] However, the existing AVC automatic voltage control and unit reactive PID regulation technology of hydropower stations still have many problems in actual operation. At present, AVC mainly adjusts the bus voltage by detecting the deviation between the measured value and the target value of the bus voltage, calculating the total reactive setting value of the whole plant and allocating it to the unit reactive PID module; the unit reactive PID module performs closed-loop regulation according to the difference between the reactive setting value and the actual value. However, the voltage regulation coefficient in AVC is difficult to set accurately, which makes the calculated reactive setting value of each unit deviate from the theoretical value. In addition, the regulation effect of the unit reactive PID module is greatly affected by the PID adjustment parameters and reactive fluctuations. When the PID adjustment parameters are inappropriate or the reactive fluctuations are large, the PID closed-loop regulation will act frequently, resulting in reactive overshoot or undershoot, and it cannot be adjusted in place for a long time, and even reactive fluctuations will occur, which will cause bus voltage oscillation. These problems have seriously affected the stability of the power output of the hydropower station and the safe operation of the power grid, and a more effective technical solution is urgently needed to solve them. Summary of the invention

[0004] In view of the above existing problems, the present invention is proposed.

[0005] Therefore, the present invention provides a method for automatic voltage control and reactive PID regulation of a hydropower station to solve the problems of inaccurate voltage regulation coefficient in the existing hydropower station AVC automatic voltage control, unstable reactive regulation caused by reactive PID regulation parameters or reactive fluctuations of the unit, and bus voltage oscillation.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0007] In a first aspect, the present invention provides a method for automatic voltage control of a hydropower station and reactive power PID regulation of a unit, including:

[0008] Real-time monitor the bus voltage value of the hydropower station, and obtain a signal indicating whether the bus voltage regulation is completed or not completed according to the bus voltage value;

[0009] Send the signal indicating whether the bus voltage regulation is completed or not completed, and the signal indicating the input or withdrawal state of the automatic voltage control to the reactive power PID module of the unit;

[0010] Based on the bus voltage regulation signal and the automatic voltage control signal, the reactive power PID module of the unit performs closed-loop regulation or open-loop regulation.

[0011] As a preferred solution of the method for automatic voltage control of a hydropower station and reactive power PID regulation of a unit according to the present invention, wherein: obtaining a signal indicating whether the bus voltage regulation is completed or not completed according to the bus voltage includes:

[0012] Obtain the real-time bus voltage value, and calculate the voltage difference between the real-time bus voltage value and the target bus voltage value;

[0013] Judge whether the voltage difference exceeds the voltage regulation dead zone, and output a signal indicating whether the bus voltage regulation is completed or not completed according to the judgment result.

[0014] As a preferred solution of the method for automatic voltage control of a hydropower station and reactive power PID regulation of a unit according to the present invention, wherein: based on the bus voltage regulation signal and the automatic voltage control signal, the reactive power PID module of the unit performs closed-loop regulation or open-loop regulation, including:

[0015] When the automatic voltage control sends a signal indicating that the regulation is completed to the reactive power PID module of the unit, the reactive power PID module locks the reactive power PID regulation of the unit;

[0016] When the automatic voltage control sends a signal indicating that the regulation is not completed to the reactive power PID module of the unit, the reactive power PID module unlocks the reactive power PID regulation of the unit.

[0017] As a preferred solution of the method for automatic voltage control of a hydropower station and reactive power PID regulation of a unit according to the present invention, wherein: when the automatic voltage control sends a signal indicating that the regulation is completed to the reactive power PID module of the unit, the reactive power PID module locks the reactive power PID regulation of the unit, including:

[0018] When the automatic voltage control sends a signal indicating that the regulation is completed to the reactive power PID module of the unit, if the unit is in the state of input of the automatic voltage control, the reactive power PID module stops outputting pulses according to the open-loop regulation logic and no longer performs reactive power regulation;

[0019] When the automatic voltage control sends a regulation completion signal to the unit's reactive power PID module, if the unit is in the state of exiting the automatic voltage control, according to the blocking instruction of the automatic voltage control, the unit's reactive power PID module pauses the closed-loop regulation.

[0020] The beneficial effects of this preferred technical solution are as follows: When the unit is in the state of being put into the automatic voltage control, the output pulse stops for reactive power regulation, preventing excessive regulation from causing reactive power fluctuations and maintaining the stability of the grid's reactive power; when the unit is in the state of exiting the automatic voltage control, the closed-loop regulation is paused, avoiding unreasonable regulation actions in the exit state, thereby reducing the interference to the bus voltage and improving the stability of the hydropower station's power output.

[0021] As a preferred solution of the automatic voltage control of the hydropower station and the unit reactive power PID regulation method described in the present invention, wherein: when the automatic voltage control sends a regulation incomplete signal to the unit reactive power PID module, the unit reactive power PID module unlocks the unit reactive power PID regulation, including:

[0022] When the automatic voltage control sends a regulation incomplete signal to the unit reactive power PID module, if the unit is in the state of being put into the automatic voltage control, the unit reactive power PID module unlocks the regulation of this cycle and performs open-loop regulation according to the reactive power set value instruction issued by the automatic voltage control.

[0023] When the automatic voltage control sends a regulation incomplete signal to the unit reactive power PID module, if the unit is in the state of exiting the automatic voltage control, after unlocking, the unit reactive power PID module calculates the regulation pulse width time according to the difference between the reactive power set value and the actual transmitted value according to the closed-loop regulation logic and regulates the excitation system.

[0024] The beneficial effects of this preferred technical solution are as follows: When the unit is in the state of being put into the automatic voltage control, the open-loop regulation can quickly respond to the reactive power set value instruction and quickly adjust the reactive power output to help the bus voltage stabilize as soon as possible; when in the state of exiting the automatic voltage control, the closed-loop regulation accurately calculates the regulation pulse width time according to the reactive power deviation, which can improve the accuracy of the unit's reactive power regulation.

[0025] As a preferred solution of the automatic voltage control of the hydropower station and the unit reactive power PID regulation method described in the present invention, wherein: judging whether the voltage difference exceeds the voltage regulation dead zone, and outputting a bus voltage regulation completion or regulation incomplete signal according to the judgment result, including:

[0026] If the voltage difference does not exceed the voltage regulation dead zone, output a bus voltage regulation completion signal;

[0027] If the voltage difference exceeds the voltage regulation dead zone, output a bus voltage regulation incomplete signal.

[0028] As a preferred solution of the automatic voltage control of a hydropower station and the unit reactive power PID regulation method described in the present invention, wherein: the regulation pulse width time is calculated based on the difference between the reactive power set value and the actual generated value, and the excitation system is regulated, including:

[0029]

[0030] Among them, U(k)1 represents the regulation pulse width time output during the kth regulation when the unit is in the state of exiting the automatic voltage control, K p represents the proportional term coefficient of each regulation, e(k) represents the deviation between the reactive power set value and the actual generated value during the kth regulation, K i represents the integral term coefficient of each regulation, e(j) represents the deviation between the reactive power set value and the actual generated value during the jth regulation, K d represents the differential term coefficient of each regulation, and e(k - 1) represents the deviation between the reactive power set value and the actual generated value during the (k - 1)th regulation.

[0031] In a second aspect, the present invention provides an automatic voltage control system for a hydropower station and a unit reactive power PID regulation system, including: a data acquisition module, configured to acquire the bus voltage value of the hydropower station, and based on the bus voltage value, acquire a signal indicating that the bus voltage regulation is completed or not completed;

[0032] An automatic voltage control module, configured to send the signal indicating that the bus voltage regulation is completed or not completed, and the signal indicating the input or exit state of the automatic voltage control to the unit reactive power PID module;

[0033] A control regulation module, configured to perform closed-loop regulation or open-loop regulation on the unit reactive power PID module based on the bus voltage regulation signal and the automatic voltage control signal.

[0034] In a third aspect, the present invention provides an electronic device, including:

[0035] A memory and a processor;

[0036] The memory is used to store computer-executable instructions, and the processor is used to execute the computer-executable instructions. When the computer-executable instructions are executed by the processor, the steps of the automatic voltage control of the hydropower station and the unit reactive power PID regulation method are implemented.

[0037] In a fourth aspect, the present invention provides a computer-readable storage medium, which stores computer-executable instructions. When the computer-executable instructions are executed by a processor, the steps of the automatic voltage control of the hydropower station and the unit reactive power PID regulation method are implemented.

[0038] Compared with the prior art, the beneficial effects of the present invention are as follows: When the automatic voltage control function is enabled, the reactive power PID regulation of the unit is improved from closed-loop control to open-loop control, and the reactive power PID module of the unit will not perform repeated closed-loop regulation on the reactive power. In the entire automatic voltage control, the bus voltage is used as the closed-loop target, and small-step pulses are sent to the excitation system through the reactive power PID module of the unit for regulation, ensuring that the bus voltage of the automatic voltage control smoothly enters the dead zone. This can avoid voltage overshoot caused by inappropriate voltage regulation coefficients or PID parameters, and can also prevent the unit's reactive power from being in closed-loop regulation for a long time, thereby reducing the risk of reactive power and system voltage oscillation. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0040] Figure 1 It is a schematic diagram of the overall process of the automatic voltage control of a hydropower station and the reactive power PID regulation method of the unit according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0041] In order to make the above objects, features, and advantages of the present invention more obvious and understandable, the following will describe the specific embodiments of the present invention in detail with reference to the drawings of the specification. Obviously, the described embodiments are part of the embodiments of the present invention, not all of them. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0042] Embodiment 1, referring to Figure 1 , which is an embodiment of the present invention, provides a method for automatic voltage control of a hydropower station and reactive power PID regulation of the unit, including:

[0043] S100: Real-time monitor the bus voltage value of the hydropower station, and obtain the signal indicating that the bus voltage regulation is completed or not completed according to the bus voltage value;

[0044] S102: Send the signal indicating that the bus voltage regulation is completed or not completed, and the signal indicating the input or output state of the automatic voltage control to the reactive power PID module of the unit;

[0045] S104: Based on the bus voltage regulation signal and the automatic voltage control signal, the reactive power PID module of the unit performs closed-loop regulation or open-loop regulation.

[0046] It should be noted that by implementing the above steps, the stability and accuracy of power regulation in hydropower stations can be effectively improved. Real-time monitoring of the bus voltage value and obtaining the regulation status signal provide a basis for subsequent regulation, enabling timely grasp of whether the bus voltage is within the ideal range and ensuring the timeliness of regulation. The automatic voltage control sends relevant signals to the unit reactive power PID module, realizing information interaction among different control links, enabling the unit reactive power PID module to respond based on the bus voltage condition and the input / output state of the automatic voltage control. Based on these signals, the unit reactive power PID module performs closed-loop or open-loop regulation. When the bus voltage regulation is completed, if the unit is in the state of automatic voltage control input, stopping the reactive power regulation can avoid over-regulation; if in the output state, pausing the closed-loop regulation can prevent unreasonable actions. When the bus voltage regulation is not completed, the open-loop regulation in the input state can quickly respond to the reactive power set value command, and the closed-loop regulation in the output state can accurately regulate the reactive power, thus effectively avoiding the problems of unstable reactive power regulation and bus voltage oscillation caused by inaccurate voltage regulation coefficients, inappropriate PID parameters, or reactive power fluctuations.

[0047] Example 2. Refer to Figure 1 , which is an embodiment of the present invention. Based on the above embodiment, a method for automatic voltage control and unit reactive power PID regulation in a hydropower station is provided.

[0048] In the embodiment of the present invention, in step S100, the bus voltage value of the hydropower station is monitored in real time, and according to the bus voltage value, a signal indicating that the bus voltage regulation is completed or not completed is obtained, including the following steps A1 - A2:

[0049] A1: Obtain the real-time bus voltage value and calculate the voltage difference between the real-time bus voltage value and the target bus voltage value;

[0050] A2: Determine whether the voltage difference exceeds the voltage regulation dead zone, and output a signal indicating that the bus voltage regulation is completed or not completed according to the judgment result.

[0051] In the embodiment of the present invention, if the voltage difference does not exceed the voltage regulation dead zone, a signal indicating that the bus voltage regulation is completed is output; if the voltage difference exceeds the voltage regulation dead zone, a signal indicating that the bus voltage regulation is not completed is output.

[0052] In the embodiment of the present invention, if the voltage difference exceeds the voltage regulation dead zone, calculate the total reactive power set value of the hydropower station and complete the reactive power distribution of each unit.

[0053] In an alternative embodiment, the setting of the voltage regulation dead zone can be determined by long-term monitoring and analysis of the bus voltage fluctuation range, combined with the tolerance and regulation accuracy of the equipment, to determine a suitable voltage difference as the voltage regulation dead zone. At the same time, it is also necessary to avoid the system from performing adjustment actions too frequently while ensuring the stability of the bus voltage. For example, the voltage regulation dead zone can be set to ±0.3 kV, ±0.5 kV, ±0.2 kV, etc.

[0054] It should be noted that the bus voltage difference is obtained and calculated in real time, enabling the system to clearly understand the degree to which the bus voltage deviates from the target value. By comparing the voltage difference with the voltage regulation dead zone to output a regulation completion or non-completion signal, the effective identification of the bus voltage regulation state is achieved. If the difference does not exceed the dead zone, a regulation completion signal is output, which can avoid unnecessary adjustment actions of the system, reduce equipment losses and energy consumption, and maintain system stability; if the difference exceeds the dead zone, a non-completion signal is output, which can trigger the system to perform regulation in a timely manner to ensure that the bus voltage is within a reasonable range.

[0055] In the embodiment of the present invention, in step S104, based on the bus voltage regulation signal and the automatic voltage control signal, the unit reactive power PID module performs closed-loop regulation or open-loop regulation, including the following steps B1 - B2:

[0056] B1: When the automatic voltage control sends a regulation completion signal to the unit reactive power PID module, the unit reactive power PID module locks the unit reactive power PID regulation.

[0057] B2: When the automatic voltage control sends a regulation non-completion signal to the unit reactive power PID module, the unit reactive power PID module unlocks the unit reactive power PID regulation.

[0058] In the embodiment of the present invention, the above step B1 specifically includes:

[0059] ① When the automatic voltage control sends a regulation completion signal to the unit reactive power PID module, if the unit is in the automatic voltage control input state, the unit reactive power PID module stops outputting pulses according to the open-loop regulation logic and no longer performs reactive power regulation;

[0060] ② When the automatic voltage control sends a regulation completion signal to the unit reactive power PID module, if the unit is in the automatic voltage control output state, according to the locking instruction of the automatic voltage control, the unit reactive power PID module pauses the closed-loop regulation.

[0061] In an alternative embodiment, step B1 may further include: when the automatic voltage control sends a regulation completion signal to the unit reactive power PID module, if the unit is in the automatic voltage control enabled state, in addition to stopping the output of pulses according to the open-loop regulation logic and no longer performing reactive power regulation, the system may also be triggered to perform intelligent analysis on the current regulation data. For example, analyze the change curve of the bus voltage and the response of the reactive power during this regulation process, compare with the historical regulation data, and evaluate the rationality of the current automatic voltage control strategy and the unit reactive power PID regulation parameters. If it is found that some parameter settings are unreasonable or there is room for optimization, the system can automatically record and generate optimization suggestions for the staff to adjust the relevant parameters in subsequent operations, continuously improving the regulation performance and stability of the system.

[0062] In another alternative embodiment, step B1 may further include: when the automatic voltage control sends a regulation completion signal to the unit reactive power PID module, if the unit is in the automatic voltage control disabled state, after suspending the closed-loop regulation according to the blocking instruction of the automatic voltage control, a comprehensive inspection of the unit's operating state can be carried out. This includes checking whether the physical parameters such as the temperature and vibration of the unit are normal, and monitoring the power supply stability of the excitation system. If any abnormal situation is found, a warning signal is sent in a timely manner to notify the staff for repair and maintenance, avoiding potential equipment failures from affecting subsequent reactive power regulation and power output.

[0063] In the embodiment of the present invention, the above step B2 specifically includes:

[0064] ① When the automatic voltage control sends a regulation incomplete signal to the unit reactive power PID module, if the unit is in the automatic voltage control enabled state, the unit reactive power PID module unlocks the regulation of this cycle and performs open-loop regulation according to the reactive power set value instruction issued by the automatic voltage control;

[0065] In the embodiment of the present invention, when the unit reactive power PID module adopts the open-loop regulation mode, the formula for obtaining the regulation pulse width time is expressed as:

[0066] U(k)2 = K p *e(k)

[0067] Wherein, U(k)2 represents the regulation pulse width time output during the k-th regulation when the unit is in the automatic voltage control enabled state, K p represents the proportional term coefficient of each regulation, and e(k) represents the deviation between the reactive power set value and the actual output value during the k-th regulation.

[0068] In the embodiment of the present invention, the proportional term parameter K p represents the regulation amount of the reactive power of the excitation system corresponding to the unit pulse opening time.

[0069] ② When the automatic voltage control sends an adjustment incomplete signal to the unit reactive power PID module, if the unit is in the state of automatic voltage control withdrawal, after unlocking, the unit reactive power PID module calculates the adjustment pulse width time according to the difference between the reactive power set value and the actual output value according to the closed-loop adjustment logic, and adjusts the excitation system.

[0070] In an embodiment of the present invention, when the unit reactive power PID module adopts the closed-loop adjustment mode, the formula for obtaining the adjustment pulse width time is expressed as:

[0071]

[0072] Wherein, U(k)1 represents the adjustment pulse width time output during the kth adjustment when the unit is in the state of automatic voltage control withdrawal, K p represents the proportional term coefficient of each adjustment, e(k) represents the deviation between the reactive power set value and the actual output value during the kth adjustment, K i represents the integral term coefficient of each adjustment, e(j) represents the deviation between the reactive power set value and the actual output value during the jth adjustment, K d represents the differential term coefficient of each adjustment, and e(k - 1) represents the deviation between the reactive power set value and the actual output value during the (k - 1)th adjustment.

[0073] In an alternative embodiment, step B2 may further include: when the automatic voltage control sends an adjustment incomplete signal to the unit reactive power PID module, if the unit is in the state of automatic voltage control input, the unit reactive power PID module unlocks the adjustment of this cycle and performs open-loop adjustment according to the reactive power set value instruction issued by the automatic voltage control. In order to prevent overshoot during the adjustment process, an overshoot protection mechanism can be set. That is, a maximum allowable adjustment pulse width time is preset. When the calculated adjustment pulse width time exceeds it, the adjustment pulse width time is automatically limited for adjustment. At the same time, the number of overshoots and relevant data are recorded to optimize the adjustment parameters and control strategies of the system subsequently, gradually reduce the occurrence of overshoot, and ensure the stable adjustment of the bus voltage and reactive power.

[0074] In another alternative embodiment, step B2 may further include: when the automatic voltage control sends an adjustment incomplete signal to the unit reactive power PID module, if the unit is in the automatic voltage control exit state, after unlocking, when the unit reactive power PID module adjusts the excitation system by calculating the adjustment pulse width time according to the difference between the reactive power set value and the actual output value according to the closed-loop adjustment logic, an adaptive adjustment mechanism can be introduced. According to the real-time load condition of the unit and the changes in the operating environment, the proportional term coefficient, integral term coefficient, and differential term coefficient are automatically adjusted. For example, when the unit load increases, the proportional term coefficient is appropriately increased to accelerate the adjustment speed; when the operating environment temperature changes greatly, according to the relationship model between the temperature and the adjustment parameters, the integral term coefficient and the differential term coefficient are adjusted so that the unit reactive power PID module can achieve the best adjustment effect under different working conditions, ensure the stable output of the unit reactive power, and thus maintain the stability of the bus voltage.

[0075] It should be noted that when the automatic voltage control sends a bus voltage adjustment completion signal, if the unit is in the input state, the module stops the pulse output and reactive power adjustment according to the open-loop logic to avoid reactive power fluctuations and bus voltage oscillations caused by over-adjustment; if it is in the exit state, pausing the closed-loop adjustment can prevent ineffective or harmful adjustment and maintain the stability of the unit.

[0076] It should also be noted that when the automatic voltage control sends a bus voltage adjustment incomplete signal, if the unit is in the input state, the module unlocks the open-loop adjustment for rapid response, so that the reactive power quickly approaches the set value and helps the bus voltage stabilize as soon as possible; if it is in the exit state, the module adjusts according to the closed-loop logic to ensure the stable output of reactive power and maintain the stability of the bus voltage to adapt to different working conditions.

[0077] Embodiment 3, referring to Table 1, is an embodiment of the present invention. Based on the above embodiments, a method for automatic voltage control and unit reactive power PID adjustment of a hydropower station is provided, and scientific verification is carried out through experiments.

[0078] Set the experimental calculation proportional term parameter K p , that is, the adjustment amount of the excitation system reactive power corresponding to the unit pulse opening time.

[0079] During the reactive power adjustment process, combining historical data and test data, record the corresponding relationship between the pulse opening time of the computer monitoring system and the excitation system reactive power adjustment amount during multiple adjustments, as shown in Table 1;

[0080] Table 1 Corresponding relationship table

[0081]

[0082] By comparing the data in Table 1 and having a detailed understanding of the excitation system, determine the corresponding relationship between the pulse opening time of the computer monitoring system and the excitation system reactive power adjustment amount.

[0083] Thus, the proportional term parameter K p is calculated by the formula:

[0084]

[0085] where K p is the proportional term parameter, Q(j) is the measured value after reactive power regulation, Q ′ (j) is the measured value before reactive power regulation, T(j) is the time, and n is the number of regulations.

[0086] In actual production operation, there will be a certain degree of fluctuation in the reactive power of the unit. Therefore, a regulation dead zone ΔQ dead is set for reactive power regulation. The maximum allowable value U max of the pulse output time that the excitation system can receive is obtained by setting of the excitation system. Therefore, an upper limit ΔQ max of the deviation between the single setting value and the measured value should be set for reactive power regulation. max

[0087] where Q set represents the reactive power setting value of the unit, Q real is the current measured reactive power value, ΔQ dead represents the reactive power regulation dead zone, ΔQ max = K p * U max . Since the value of ΔQ max is generally very large, in actual production operation, the deviation between the reactive power setting value and the measured value generally does not exceed this value.

[0088] When 0 <= |ΔQ max - Q real | <= ΔQ dead , the deviation between the reactive power setting value and the measured value is within the dead zone, and no regulation is performed. The pulse output time U(k) = 0;

[0089] When ΔQ dead < |Q set - Q real | < ΔQ max , the deviation between the reactive power setting value and the measured value is greater than the dead zone and less than ΔQ max . Regulation is performed according to the linear proportion. The pulse output time U(k)2 = K p * e(k);

[0090] When ΔQ max <= |Q set - Q real |, the deviation between the reactive power setting value and the measured value is greater than ΔQ max . Regulation is performed according to the maximum pulse width. U(k) = Q max . ​

[0091] Embodiment 4. The above is a schematic solution for an automatic voltage control of a hydropower station and a unit reactive power PID regulation method. It should be noted that the technical solution of the automatic voltage control of the hydropower station and the unit reactive power PID regulation system belongs to the same concept as the technical solution of the above-mentioned automatic voltage control of the hydropower station and the unit reactive power PID regulation method. For the details not described in detail in the technical solution of the automatic voltage control of the hydropower station and the unit reactive power PID regulation system in this embodiment, reference can be made to the description of the technical solution of the above-mentioned automatic voltage control of the hydropower station and the unit reactive power PID regulation method.

[0092] This embodiment also provides an automatic voltage control of a hydropower station and a unit reactive power PID regulation system, including:

[0093] A data acquisition module, configured to acquire the bus voltage value of the hydropower station, and according to the bus voltage value, acquire a signal indicating that the bus voltage regulation is completed or not completed;

[0094] An automatic voltage control module, configured to send the signal indicating that the bus voltage regulation is completed or not completed, and the signal of the input or withdrawal state of the automatic voltage control to the unit reactive power PID module;

[0095] A control and regulation module, configured to perform closed-loop regulation or open-loop regulation on the unit reactive power PID module based on the bus voltage regulation signal and the automatic voltage control signal.

[0096] This embodiment also provides an electronic device, applicable to the situation of automatic voltage control of a hydropower station and unit reactive power PID regulation, including: a memory and a processor; the memory is used to store computer-executable instructions, and the processor is used to execute the computer-executable instructions to implement the method for realizing automatic voltage control of a hydropower station and unit reactive power PID regulation as proposed in the above embodiment.

[0097] This embodiment also provides a storage medium, on which a computer program is stored, and when the program is executed by a processor, it implements the method for realizing automatic voltage control of a hydropower station and unit reactive power PID regulation as proposed in the above embodiment.

[0098] The storage medium proposed in this embodiment and the method for realizing automatic voltage control of a hydropower station and unit reactive power PID regulation proposed in the above embodiment belong to the same inventive concept. The technical details not described in detail in this embodiment can be referred to the above embodiment, and this embodiment has the same beneficial effects as the above embodiment.

[0099] From the above description of the embodiments, those skilled in the art can clearly understand that the present invention can be implemented by means of software and the necessary general-purpose hardware, and of course, it can also be implemented by hardware. Based on such an understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as a floppy disk, read-only memory (ROM), random access memory (RAM), flash memory, hard disk, or optical disc of a computer, etc., and includes several instructions for causing a computer device (which can be a personal computer, server, or network device, etc.) to execute the methods of various embodiments of the present invention.

[0100] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not restrictive. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention, and they should all be covered within the scope of the claims of the present invention.

Claims

1. An automatic voltage control method for a hydropower station and a unit reactive power PID regulation method, characterized in that Including: Obtain the bus voltage value of the hydropower station, and based on the bus voltage value, obtain a signal indicating whether the bus voltage regulation is completed or not completed; Send the signal indicating whether the bus voltage regulation is completed or not completed, and the signal indicating the input or output state of the automatic voltage control to the unit reactive power PID module; Based on the bus voltage regulation signal and the automatic voltage control signal, the unit reactive power PID module performs closed-loop regulation or open-loop regulation.

2. The automatic voltage control and unit reactive power PID regulation method for a hydropower station according to claim 1, characterized in that Obtaining a signal indicating whether the bus voltage regulation is completed or not completed according to the bus voltage includes: Obtain the real-time bus voltage value, and calculate the voltage difference between the real-time bus voltage value and the target bus voltage value; Judge whether the voltage difference exceeds the voltage regulation dead zone, and output a signal indicating whether the bus voltage regulation is completed or not completed according to the judgment result.

3. The automatic voltage control and unit reactive power PID regulation method for a hydropower station according to claim 2, characterized in that, Based on the bus voltage regulation signal and the automatic voltage control signal, the unit reactive power PID module performs closed-loop regulation or open-loop regulation, including: When the automatic voltage control sends a signal indicating that the regulation is completed to the unit reactive power PID module, the unit reactive power PID module locks the unit reactive power PID regulation; When the automatic voltage control sends a signal indicating that the regulation is not completed to the unit reactive power PID module, the unit reactive power PID module unlocks the unit reactive power PID regulation.

4. The automatic voltage control and unit reactive power PID regulation method for a hydropower station according to claim 3, characterized in that, When the automatic voltage control sends a signal indicating that the regulation is completed to the unit reactive power PID module, the unit reactive power PID module locks the unit reactive power PID regulation, including: When the automatic voltage control sends a signal indicating that the regulation is completed to the unit reactive power PID module, if the unit is in the state of automatic voltage control input, the unit reactive power PID module stops outputting pulses according to the open-loop regulation logic and no longer performs reactive power regulation; When the automatic voltage control sends a signal indicating that the regulation is completed to the unit reactive power PID module, if the unit is in the state of automatic voltage control output, according to the lock instruction of the automatic voltage control, the unit reactive power PID module pauses the closed-loop regulation.

5. The automatic voltage control and unit reactive power PID regulation method for a hydropower station according to claim 4, characterized in that, When the automatic voltage control sends a signal indicating that the regulation is not completed to the unit reactive power PID module, the unit reactive power PID module unlocks the unit reactive power PID regulation, including: When the automatic voltage control sends a signal indicating that the regulation is not completed to the unit reactive power PID module, if the unit is in the state of automatic voltage control input, the unit reactive power PID module unlocks the regulation of this cycle and performs open-loop regulation according to the reactive power setting value instruction issued by the automatic voltage control; When the automatic voltage control sends a signal indicating that the regulation is not completed to the unit reactive power PID module, if the unit is in the state of automatic voltage control output, after unlocking, the unit reactive power PID module calculates the regulation pulse width time according to the difference between the reactive power setting value and the actual transmitted value according to the closed-loop regulation logic, and regulates the excitation system.

6. The automatic voltage control method and unit reactive power PID regulation method for a hydropower station according to claim 2, characterized in that, Judge whether the voltage difference exceeds the voltage regulation dead zone, and output a signal indicating whether the bus voltage regulation is completed or not completed according to the judgment result, including: If the voltage difference does not exceed the voltage regulation dead zone, output a signal indicating that the bus voltage regulation is completed; If the voltage difference exceeds the voltage regulation dead zone, output a signal indicating that the bus voltage regulation is not completed.

7. The automatic voltage control method for a hydropower station and the unit reactive power PID regulation method according to claim 5, characterized in that, Calculating the regulation pulse width time according to the difference between the reactive power setting value and the actual transmitted value, and regulating the excitation system, including: Among them, U(k)1 represents the regulation pulse width time output during the k-th regulation when the unit is in the state of exiting automatic voltage control, K p represents the proportional term coefficient of each regulation, e(k) represents the deviation between the reactive power set value and the actual output value during the k-th regulation, K i represents the integral term coefficient of each regulation, e(j) represents the deviation between the reactive power set value and the actual output value during the j-th regulation, K d represents the differential term coefficient of each regulation, e(k - 1) represents the deviation between the reactive power set value and the actual output value during the (k - 1)-th regulation.

8. An automatic voltage control and unit reactive power PID regulation system for a hydropower station, which applies the method according to any one of claims 1-7, is characterized in that, Including: A data acquisition module, configured to acquire the bus voltage value of a hydropower station, and based on the bus voltage value, acquire a signal indicating that the bus voltage regulation is completed or not completed; An automatic voltage control module, configured to send the signal indicating that the bus voltage regulation is completed or not completed, and the signal indicating the input or withdrawal state of the automatic voltage control to the unit reactive power PID module; A control and regulation module, configured to perform closed-loop regulation or open-loop regulation on the unit reactive power PID module based on the bus voltage regulation signal and the automatic voltage control signal.

9. An electronic device, comprising: A memory and a processor; The memory is configured to store computer-executable instructions, and the processor is configured to execute the computer-executable instructions. When the computer-executable instructions are executed by the processor, the steps of the method for automatic voltage control of a hydropower station and unit reactive power PID regulation according to any one of claims 1 to 7 are implemented.

10. A computer-readable storage medium, which stores computer-executable instructions. When the computer-executable instructions are executed by a processor, the steps of the method for automatic voltage control of a hydropower station and unit reactive power PID regulation according to any one of claims 1 to 7 are implemented.

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