A method and system for primary frequency modulation grouping control of a hydroelectric generating unit

Abstract

This invention discloses a method for group control of primary frequency regulation of hydropower units, comprising: grouping the units according to the number of generator units in the water diversion system to determine primary frequency regulation control units; configuring each primary frequency regulation control unit with a primary frequency regulation group controller; the primary frequency regulation group controller computer sets the primary frequency regulation target opening amplitude and power amplitude, and allocates the load after primary frequency regulation calculation; selecting a primary frequency regulation execution unit according to the layout of the water diversion system and the primary frequency regulation frequency disturbance regulation performance, and performing primary frequency regulation group control on the generator units; in the primary frequency regulation group control, setting primary frequency regulation indicators to achieve primary frequency regulation of the power grid. This invention can effectively reduce the hydraulic coupling effect caused by simultaneous flow regulation between units, improve the stability and quality of primary frequency regulation during the regulation process.

Description

Technical Field

[0001] This invention relates to the technical field of grid-source coordination, and in particular to a method and system for primary frequency regulation group control of hydropower units. Background Technology

[0002] Primary frequency regulation is one of the fundamental functions of generator units and an important technical means to ensure the safe, stable, and high-quality operation of the power grid. The implementation of primary frequency regulation in hydropower plants plays a crucial role in maintaining grid frequency stability and ensuring power supply quality. Currently, all operating hydropower units in my country adopt the single-unit primary frequency regulation control method. However, for long-diversion water systems, especially power plants with multiple units in one tunnel, when the primary frequency regulation of a unit is activated, all units operate simultaneously. Due to the influence of hydraulic factors, they are mutually coupled, resulting in large power fluctuations, which affects the actual regulation quality of primary frequency regulation and is not conducive to the rapid recovery of the grid frequency. Summary of the Invention

[0003] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the invention.

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

[0005] Therefore, the purpose of this invention is to provide a group control method for primary frequency regulation of hydropower units to solve the problems of mutual coupling, large power fluctuations, poor actual regulation quality of primary frequency regulation, and the inability to quickly restore the grid frequency during primary frequency regulation of the units.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution:

[0007] In a first aspect, embodiments of the present invention provide a method for primary frequency regulation group control of hydropower units, comprising:

[0008] Grouping is done according to the number of generator sets in the water diversion system to determine the primary frequency control unit;

[0009] Each of the primary frequency modulation control units is configured with a set of primary frequency modulation group controllers;

[0010] The primary frequency modulation group controller computer group determines the primary frequency modulation target opening amplitude and power amplitude, and allocates the load after primary frequency modulation calculation;

[0011] Based on the layout of the water diversion system and the frequency disturbance regulation performance of the primary frequency regulation, a primary frequency regulation actuator is selected to perform primary frequency regulation group control of the generator sets.

[0012] In the primary frequency regulation group control, a primary frequency regulation index is set to achieve primary frequency regulation of the power grid.

[0013] As described in this invention, a primary frequency regulation group control method for hydropower units includes: the primary frequency regulation control unit comprising...

[0014] If a water diversion system contains two generator sets, then the two generator sets form a group, which is a primary frequency control unit.

[0015] If a water diversion system contains three generator sets, then the three generator sets form a group, which is a primary frequency control unit.

[0016] As described in this invention, a primary frequency regulation group control method for hydropower units includes: the primary frequency regulation target opening amplitude and power amplitude of the primary frequency regulation group controller computer group, which include...

[0017] If the speed controller is in open mode, the target open amplitude for the computer group's primary frequency regulation is as follows:

[0018]

[0019] Where, ΔY PFC The target opening amplitude for primary frequency regulation of the unit is given by f, where Δf is the effective frequency deviation of the unit. r For the rated frequency, b p P is the permanent slip coefficient. ri P is the rated power of the i-th unit. rj This refers to the rated power of the primary frequency regulation unit in this group;

[0020] If the speed controller is in power mode, the target power amplitude for the first frequency regulation of the computer group is as follows:

[0021]

[0022] Where, ΔP PFC The target power amplitude for primary frequency regulation of the unit is given by f, where Δf is the effective frequency deviation of the unit. r For the rated frequency, P ri e is the rated power of the i-th unit. p This refers to the power droop rate.

[0023] As described in this invention, the method for primary frequency regulation group control of hydropower units includes: the selection of the primary frequency regulation execution unit.

[0024] The selection is based on the layout of the water diversion system and the frequency disturbance regulation performance of the primary frequency regulation. Generally, one unit is selected as the primary frequency regulation execution unit in the same group, while the actuators of other units remain stationary during the primary frequency regulation operation.

[0025] At least two operating conditions, namely 60% and 85% of rated active power, should be tested for frequency step. Each operating condition step test should include an effective frequency difference step of at least ±0.1Hz. Select one unit that meets the primary frequency regulation performance requirements, has good regulation stability, few power fluctuations, and small fluctuations in the inlet water pressure of the volute as the primary frequency regulation execution unit.

[0026] As described in this invention, a primary frequency regulation group control method for hydropower units includes: setting primary frequency regulation indicators, etc.

[0027] It shall not be lower than the existing response indicators of the controlled units, and shall not change the overall contribution capacity of the controlled units to the power grid.

[0028] The inherent dead zone, response lag time, response rate, and settling time of the group-controlled primary frequency regulation all meet the existing regulations, and the load change amplitude is not less than ±10% of the sum of the rated loads of all units in the group control.

[0029] To ensure the safety and stability of the power grid under the increased probability of large-scale regulation by group regulation, the definitions of the number of primary frequency oscillations and the attenuation rate are added.

[0030] As described in this invention, a method for primary frequency regulation group control of a hydropower unit includes defining the number of primary frequency regulation oscillations and the attenuation rate.

[0031] In the continuous acquisition waveform of the active power of the generator set, one peak and one trough constitute one oscillation, and a single peak or trough constitutes 0.5 oscillations, which constitute the number of frequency modulation oscillations for group adjustment, and the number of oscillations shall not exceed 2.5.

[0032] In the continuously acquired waveform of the active power of the generator set, the ratio of the difference between the second peak and the trough to the difference between the first peak and the trough is set to the group-adjusted primary frequency modulation oscillation attenuation rate, and the attenuation rate is greater than 50%.

[0033] Secondly, embodiments of the present invention provide a primary frequency regulation group control system for hydropower units, comprising,

[0034] The grouping module groups the generator sets in the water diversion system according to their number, and determines the primary frequency control unit.

[0035] The primary frequency modulation group control module, the computer group, the primary frequency modulation target opening amplitude and power amplitude, and the load allocation after the primary frequency modulation calculation.

[0036] As described in this invention, a primary frequency regulation group control system for a hydropower unit includes: the primary frequency regulation group control module comprising...

[0037] Frequency measurement module, used to measure power grid frequency;

[0038] The primary frequency modulation calculation module calculates the target opening amplitude and power amplitude of the primary frequency modulation of the computer group.

[0039] The primary frequency regulation load distribution module is used for load distribution after primary frequency regulation calculation, and is connected to the speed controller of the primary frequency regulation actuator through analog current.

[0040] As described in this invention, the primary frequency regulation group control system for a hydropower unit includes a speed governor controller for the primary frequency regulation actuator, which uses the main control signal of the added primary frequency regulation group controller as an essential signal to complete the control algorithm and provide data for logical judgment.

[0041] As a primary frequency regulation group control system for hydropower units according to the present invention, the main control signals of the added primary frequency regulation group controller include group regulation activation / deactivation signal, group load increase signal, group load decrease signal, guide vane opening signal sent to the primary frequency regulation load distribution module, active power signal sent to the primary frequency regulation load distribution module, control mode signal sent to the primary frequency regulation load distribution module, unit flag signal executed by the primary frequency regulation load distribution module, group primary frequency regulation action signal, group primary frequency regulation action end signal, group primary frequency regulation action failure alarm signal, and group regulation permission signal sent.

[0042] After the group regulation permission signal is activated, the speed controller of each unit performs load allocation according to the task assigned by the primary frequency regulation load allocation module. When the group regulation permission signal is deactivated, the speed controller of each unit adjusts according to the single-unit primary frequency regulation.

[0043] The beneficial effects of this invention are as follows: Based on the characteristics of the power plant's water intake system, this invention performs group regulation, allocating a smaller number of generating units within the same water intake system to complete the primary frequency regulation task. This effectively reduces the hydraulic coupling effect caused by simultaneous flow regulation between generating units, and improves the stability and quality of the primary frequency regulation process. Attached Figure Description

[0044] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein:

[0045] Figure 1 This is a flowchart of a primary frequency regulation group control method and system for hydropower units according to the present invention.

[0046] Figure 2This is a schematic diagram of the structure of a primary frequency regulation group control system for a hydropower unit according to the present invention. Detailed Implementation

[0047] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0048] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0049] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that is mutually exclusive with other embodiments.

[0050] Secondly, the present invention is described in detail with reference to the schematic diagrams. When detailing the embodiments of the present invention, for ease of explanation, the cross-sectional views illustrating the device structure may be partially enlarged, not according to the usual scale. Furthermore, the schematic diagrams are merely examples and should not limit the scope of protection of the present invention. In addition, actual fabrication should include three-dimensional spatial dimensions of length, width, and depth.

[0051] Example 1

[0052] Reference Figure 1 A schematic diagram of the overall structure of a primary frequency regulation group control method for hydropower units is provided, as shown below. Figure 1 A method for primary frequency regulation group control of hydropower units includes:

[0053] S1: Group the generator sets in the water diversion system to determine the primary frequency control unit.

[0054] It should be noted that:

[0055] If a water diversion system contains two generator sets, then the two generator sets form a group, which is a primary frequency control unit.

[0056] If a water diversion system contains three generator sets, then the three generator sets form a group, which is a primary frequency control unit.

[0057] S2: Configure each primary frequency modulation control unit with a set of primary frequency modulation group controllers.

[0058] S3: The primary frequency regulation group controller computer group determines the target opening amplitude and power amplitude for primary frequency regulation, and allocates the load after primary frequency regulation calculation. It should be noted that:

[0059] If the speed controller is in open mode, the target open amplitude for the computer group's primary frequency regulation is as follows:

[0060]

[0061] Where, ΔY PFC The target opening amplitude for primary frequency regulation of the unit is given by f, where Δf is the effective frequency deviation of the unit. r For the rated frequency, b p P is the permanent slip coefficient. ri P is the rated power of the i-th unit. rj This refers to the rated power of the primary frequency regulation unit in this group;

[0062] If the speed controller is in power mode, the target power amplitude for the first frequency regulation of the computer group is as follows:

[0063]

[0064] Where, ΔP PFC The target power amplitude for primary frequency regulation of the unit is given by f, where Δf is the effective frequency deviation of the unit. r For the rated frequency, P ri e is the rated power of the i-th unit. p This refers to the power droop rate.

[0065] S4: Based on the layout of the water diversion system and the frequency disturbance regulation performance of the primary frequency regulation, select one primary frequency regulation actuator unit to perform primary frequency regulation group control of the generator units. It should be noted that:

[0066] The selection is based on the layout of the water diversion system and the frequency disturbance regulation performance of the primary frequency regulation. Generally, one unit is selected as the primary frequency regulation execution unit in the same group, while the actuators of other units remain stationary during the primary frequency regulation operation.

[0067] At least two operating conditions, namely 60% and 85% of rated active power, should be tested for frequency step. Each operating condition step test should include an effective frequency difference step of at least ±0.1Hz. Select one unit that meets the primary frequency regulation performance requirements, has good regulation stability, few power fluctuations, and small fluctuations in the inlet water pressure of the volute as the primary frequency regulation execution unit.

[0068] S5: In primary frequency regulation group control, primary frequency regulation targets are set to achieve primary frequency regulation of the power grid. It should be noted that:

[0069] It shall not be lower than the existing response indicators of the controlled units, and shall not change the overall contribution capacity of the controlled units to the power grid.

[0070] The inherent dead zone of primary frequency regulation of the units in a group should meet the requirements of the existing power grid regulations and provisions on primary frequency regulation lag rate.

[0071] The time required from the change in grid frequency to the start of a primary frequency regulation action value to the start of a change in the load of the generating unit is the response lag time of the primary frequency regulation, which should meet the relevant regulations and provisions of the existing power grid regarding the response lag time of the primary frequency regulation.

[0072] The time it takes for the generating unit to reach the target load level and the time it takes for the generating unit to fully respond to the target load meet the requirements of the existing power grid for the primary frequency regulation response rate.

[0073] The time required for the unit controlled by the group to stabilize from the start of the frequency change exceeding the primary frequency regulation dead zone until the power generation load reaches stability and no longer exceeds ±1% of the sum of the rated power of all units under group control should meet the requirements of the existing power grid for the primary frequency regulation stabilization time.

[0074] There is no limit to the load variation of hydropower units participating in primary frequency regulation. If a limit is required, it shall not be less than ±10% of the sum of the rated loads of all units in the unit group control.

[0075] Because group regulation increases the probability of large-scale regulation, in order to ensure the safety and stability of the power grid, the definitions of the number of primary frequency regulation oscillations and the attenuation rate are increased:

[0076] In the continuous acquisition waveform of the active power of the generator set, one peak and one trough constitute one oscillation, and a single peak or trough constitutes 0.5 oscillations, which constitute the number of frequency modulation oscillations for group adjustment, and the number of oscillations shall not exceed 2.5.

[0077] In the continuously acquired waveform of the active power of the generator set, the ratio of the difference between the second peak and the trough to the difference between the first peak and the trough is set to the group-adjusted primary frequency modulation oscillation attenuation rate, and the attenuation rate is greater than 50%.

[0078] Based on the above-described method for primary frequency regulation group control of hydropower units, the present invention also provides a primary frequency regulation group control system for hydropower units, comprising:

[0079] The grouping module 100 groups the generator sets in the water diversion system according to their number, and determines the primary frequency control unit 101.

[0080] The primary frequency modulation group control module 200, the computer group, the primary frequency modulation target opening amplitude and power amplitude, and the load allocation after primary frequency modulation calculation.

[0081] It should be noted that the primary frequency modulation group control module 200 includes:

[0082] Frequency measurement module 201 is used to measure the power grid frequency.

[0083] The primary frequency modulation calculation module 202 calculates the target opening amplitude and power amplitude of the primary frequency modulation of the computer group.

[0084] The primary frequency regulation load distribution module 203 is used for load distribution after primary frequency regulation calculation and is connected to the speed controller of the primary frequency regulation actuator through analog current.

[0085] Furthermore, the speed controller of the primary frequency control unit includes the main control signals of the added primary frequency control group controller as essential signals, completes the control algorithm, and provides data for logical judgment.

[0086] Specifically, the main control signals of the added primary frequency regulation group controller include group regulation activation / deactivation signals, group load increase signals, group load decrease signals, guide vane opening signals sent to the primary frequency regulation load distribution module 203, active power signals sent to the primary frequency regulation load distribution module 203, control mode signals sent to the primary frequency regulation load distribution module 203, unit flag signals executed by the primary frequency regulation load distribution module 203, group primary frequency regulation action signals, group primary frequency regulation action end signals, group primary frequency regulation action failure alarm signals, and group regulation permission signals sent to the primary frequency regulation group controller.

[0087] Specifically, after the group regulation permission signal is put into operation, the speed controller of each unit performs load allocation according to the task assigned by the primary frequency regulation load allocation module 203. When the group regulation permission signal is withdrawn, the speed controller of each unit performs regulation according to the single-unit primary frequency regulation.

[0088] Furthermore, there is the issue of coordination between the grouped primary frequency modulation and monitoring systems:

[0089] When in group control, from the moment the executing unit receives the primary frequency regulation action signal until the primary frequency regulation action ends, all speed controllers of the group control units send a primary frequency regulation action signal to the monitoring system. This signal is used to coordinate the relationship between primary frequency regulation and AGC control of the monitoring system.

[0090] During load regulation and AGC regulation, the computer monitoring system maintains the same control logic and methods as before group regulation to simplify the control logic. However, during load allocation among individual units, the executing units in the group primary frequency regulation must reserve reserve capacity for primary frequency regulation load. This reserve capacity is contingent upon receiving a flag signal from the executing unit. The executing unit flag signal is issued by the executing unit's speed governor. When the dispatcher orders full-load operation, the system executes the dispatcher's requirements.

[0091] For the generating units in a group-based primary frequency regulation, a primary frequency regulation reserve capacity is reserved based on the sum of the rated loads of all units in the group-based regulation. The calculation method for the primary frequency regulation reserve capacity is as follows:

[0092] ΔP PFC =0.1×∑P ri

[0093] Among them, P ri Let be the rated power of the i-th unit.

[0094] Example 2

[0095] In another embodiment of the present invention, a verification test is provided for a primary frequency regulation group control method for hydropower units, which verifies and explains the technical effects of the method.

[0096] This embodiment takes a power plant with a single tunnel and multiple generators as an example to compare the performance of conventional primary frequency regulation with the primary frequency regulation method of the present invention. The comparison results are shown in Table 1.

[0097] Table 1: Performance comparison between conventional primary frequency modulation and the primary frequency modulation method of the present invention.

[0098]

[0099] This power plant is currently in the mid-term implementation phase of the project. In fact, the single-pipe frequency regulation is very stable, and most units are in this manner. This invention mainly addresses the leakage problem in a system with one pipe and multiple units. After implementation, this invention can change the original multi-unit regulation in a system with one pipe and multiple units, i.e., the condition where the flow rate changes in each branch pipe, to the condition where only one branch pipe changes the flow rate, while the flow rates in the other branch pipes remain basically unchanged, which is close to the regulation condition of one pipe and one unit. Therefore, it will definitely improve the regulation effect.

[0100] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A method for primary frequency regulation grouping control of a hydroelectric generating unit, characterized in that, include: Grouping is done according to the number of generator sets in the water diversion system to determine the primary frequency control unit; Each of the primary frequency modulation control units is configured with a set of primary frequency modulation group controllers; The primary frequency modulation group controller computer group determines the primary frequency modulation target opening amplitude and power amplitude, and allocates the load after primary frequency modulation calculation; Based on the layout of the water diversion system and the frequency disturbance regulation performance of the primary frequency regulation, a primary frequency regulation actuator is selected to perform primary frequency regulation group control of the generator sets. In the primary frequency regulation group control, a primary frequency regulation index is set to achieve primary frequency regulation of the power grid; The selection of a primary frequency regulation actuator includes, The selection is based on the layout of the water diversion system and the frequency disturbance regulation performance of the primary frequency regulation. Generally, one unit is selected as the primary frequency regulation execution unit in the same group, while the actuators of other units remain stationary during the primary frequency regulation operation. At least two operating conditions, namely 60% and 85% of rated active power, should be tested for frequency step. Each operating condition step test should include an effective frequency difference step of at least ±0.1Hz. Select a unit that meets the primary frequency regulation performance requirements, has good regulation stability, few power fluctuations, and small fluctuations in the inlet water pressure of the volute as the primary frequency regulation execution unit.

2. The primary frequency modulation grouping control method of a hydroelectric generating unit according to claim 1, characterized in that: The primary frequency modulation control unit includes, If a water diversion system contains two generator sets, then the two generator sets form a group, which is a primary frequency control unit. If a water diversion system contains three generator sets, then the three generator sets form a group, which is a primary frequency control unit.

3. The method for primary frequency regulation group control of a hydropower unit as described in claim 1, characterized in that: The primary frequency modulation group controller computer group's primary frequency modulation target opening amplitude and power amplitude include... If the speed controller is in open mode, the target open amplitude for the computer group's primary frequency regulation is as follows: in, The target opening amplitude for primary frequency regulation of the unit. This refers to the effective frequency deviation of the generator unit. For the rated frequency, The permanent slip coefficient, For the first Rated power of the unit This refers to the rated power of the primary frequency regulation unit in this group; If the speed controller is in power mode, the target power amplitude for the first frequency regulation of the computer group is as follows: in, The target power amplitude for primary frequency regulation of the unit. This refers to the effective frequency deviation of the generator unit. For the rated frequency, For the first Rated power of the unit This refers to the power droop rate.

4. The primary frequency regulation grouping control method of a hydroelectric generating unit as claimed in claim 1, characterized in that: Setting primary frequency regulation parameters includes, It shall not be lower than the existing response indicators of the controlled units, and shall not change the overall contribution capacity of the controlled units to the power grid. The inherent dead zone, response lag time, response rate, and settling time of the group-controlled primary frequency regulation all meet the existing regulations, and the load change amplitude is not less than ±10% of the sum of the rated loads of all units in the group control. To ensure the safety and stability of the power grid under the increased probability of large-scale regulation by group regulation, the definitions of the number of primary frequency oscillations and the attenuation rate are added.

5. The primary frequency regulation grouping control method of a hydroelectric generating unit as claimed in claim 4, characterized in that: The definitions of the number of frequency modulation oscillations and the attenuation rate include: In the continuous acquisition waveform of the active power of the generator set, one peak and one trough constitute one oscillation, and a single peak or trough constitutes 0.5 oscillations, which constitute the number of frequency modulation oscillations for group adjustment, and the number of oscillations shall not exceed 2.

5. In the continuously acquired waveform of the active power of the generator set, the ratio of the difference between the second peak and the trough to the difference between the first peak and the trough is set to the group-adjusted primary frequency modulation oscillation attenuation rate, and the attenuation rate is greater than 50%.

6. A primary frequency regulation group control system for hydropower units, characterized in that: The grouping module (100) groups the generator sets in the water diversion system according to the number of generator sets and determines the primary frequency control unit (101). The primary frequency regulation group control module (200) sets the primary frequency regulation target opening amplitude and power amplitude of the computer group, and allocates the load after primary frequency regulation calculation; according to the layout of the water diversion system and the primary frequency regulation frequency disturbance regulation performance, a primary frequency regulation actuator is selected to perform primary frequency regulation group control of the generator set; The selection of a primary frequency regulation actuator includes, The selection is based on the layout of the water diversion system and the frequency disturbance regulation performance of the primary frequency regulation. Generally, one unit is selected as the primary frequency regulation execution unit in the same group, while the actuators of other units remain stationary during the primary frequency regulation operation. At least two operating conditions, namely 60% and 85% of rated active power, should be tested for frequency step. Each operating condition step test should include an effective frequency difference step of at least ±0.1Hz. Select a unit that meets the primary frequency regulation performance requirements, has good regulation stability, few power fluctuations, and small fluctuations in the inlet water pressure of the volute as the primary frequency regulation execution unit.

7. A primary frequency regulation grouping control system for a hydroelectric generating unit as described in claim 6, wherein: The primary frequency modulation group control module (200) includes, Frequency measurement module (201) is used to measure the power grid frequency; Primary frequency modulation calculation module (202), computer group primary frequency modulation target opening amplitude and power amplitude; The primary frequency regulation load distribution module (203) is used for load distribution after primary frequency regulation calculation and is connected to the speed controller of the primary frequency regulation actuator through analog current.

8. A primary frequency regulation grouping control system for a hydroelectric generating unit as described in claim 7, wherein: The speed controller of the primary frequency modulation actuator includes the main control signal of the added primary frequency modulation group controller as an essential signal, to complete the control algorithm and provide data for logical judgment.

9. A primary frequency regulation grouping control system for a hydroelectric generating unit as described in claim 8, wherein: The main control signals of the added primary frequency regulation group controller include group regulation activation / deactivation signal, group load increase signal, group load decrease signal, guide vane opening signal sent to the primary frequency regulation load distribution module (203), active power signal sent to the primary frequency regulation load distribution module (203), control mode signal sent to the primary frequency regulation load distribution module (203), unit flag signal of the primary frequency regulation load distribution module (203), group primary frequency regulation action signal, group primary frequency regulation action end signal, group primary frequency regulation action failure alarm signal, and group regulation permission signal sent. After the group regulation permission signal is activated, each unit speed controller performs load allocation according to the primary frequency regulation load allocation module (203). When the group regulation permission signal is deactivated, each unit speed controller adjusts according to the single unit primary frequency regulation.

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