A water level adaptive new energy water power generation control system

Abstract

The present invention relates to the technical field of hydropower station power generation, and specifically to a water level adaptive new energy water conservancy power generation control system, comprising a first acquisition module and a calculation module, wherein the first acquisition module acquires the measured water level of the reservoir; the calculation module calculates the real water level of the reservoir according to the measured water level of the reservoir, and performs the following steps to determine whether the real water level of the reservoir reaches the upper limit water level of the i-th generator; if so, the i-th generator is started, and the i-th generator is controlled to output a locking signal, so that other started generators except the i-th generator are locked, and the current regulating pulse width is obtained according to the real water level of the reservoir; the active load of the i-th generator is controlled to reach the active power corresponding to the current regulating pulse width. Through the changing trend of the water level in the past time, the real height of the current reservoir water level is accurately calculated, thereby accurately adjusting the generator to improve the power generation efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of hydropower station power generation, and in particular to a water level adaptive new energy hydropower generation control system. Background Art

[0002] The water level in the forebay or dam of a hydropower station reflects the vertical height from the water storage level to the turbine inlet, and represents the potential energy of the water. The higher the water level, the greater the potential energy, and the more electricity can be generated with the same flow rate.

[0003] In the related art, for example, Chinese patent CN107939590B discloses a control method for power generation according to water level, which is applied to the power generation system of a hydropower station. The power generation system includes a first generator, a second generator, and finally an Nth generator, which are started in sequence, where N is a positive integer. The i-th generator performs the following steps: judging whether the collected first water level reaches the upper limit water level of the i-th generator, if so, starting the i-th generator, and controlling the i-th generator to output a locking signal to lock other started generators except the i-th generator, where i=1, 2 to N; obtaining the current adjustment pulse width according to the first water level; controlling the active load of the i-th generator to reach the active power Pi corresponding to the current adjustment pulse width. The above control method for power generation according to water level only needs to collect water level information to enable the generator to operate on the economic water level line, with low equipment cost investment, and can start each generator in sequence according to the water level change, without the need for additional control equipment, thereby reducing the failure link.

[0004] However, it was found in actual application that the power generation system using the above-mentioned control method for power generation according to water level generally monitors the current water level height through some water level gauges. However, the water level gauges are easily affected by external environmental factors during actual use, resulting in inaccurate water level judgment, and thus unable to ensure that the generator maximizes the use of water resources, affecting the power generation efficiency. Summary of the invention

[0005] Based on this, it is necessary to provide a water level adaptive new energy water conservancy power generation control system to address the problem that the current water level meter is easily affected by external environmental factors during actual use, resulting in inaccurate water level judgment, which in turn cannot ensure the maximum utilization of water resources by the generator and affects the power generation efficiency.

[0006] The above purpose is achieved through the following technical solutions:

[0007] A water level adaptive new energy water conservancy power generation control system is applied to a hydropower station. The hydropower station includes a reservoir and a first generator, a second generator to an Nth generator that are started in sequence, where N is a positive integer. The water level adaptive new energy water conservancy power generation control system includes a first acquisition module and a calculation module. The first acquisition module is used to obtain the measured water level of the reservoir. The computing module is used to measure the water level of the reservoir Calculate the true water level of the reservoir , and perform the following steps:

[0008] Step S200, determining the actual water level of the reservoir Whether the upper limit water level of the i-th generator has been reached;

[0009] Step S210: if yes, start the i-th generator and control the i-th generator to output a locking signal to lock other started generators except the i-th generator, where i=1, 2 to N; and according to the actual water level of the reservoir Get the current adjustment pulse width;

[0010] Step S220, controlling the active load of the i-th generator to reach the active power corresponding to the current adjustment pulse width .

[0011] Furthermore, the operation module further comprises the following steps:

[0012] Step S100, setting a preset time T, wherein the preset time T includes equal , to , x is a positive integer, then the measured water level difference of the reservoir in the corresponding time is , to , calculate the rate of change of water level in the corresponding time , to ,in, , where i=1, 2 to x;

[0013] Step S110, calculate the average rate of change of the reservoir water level within a preset time T ;

[0014] Step S120, calculating the predicted change rate of the reservoir water level after n preset times T , , to is the weight, where ,and >…> > ;

[0015] Step S130, calculate the predicted water level of the reservoir after n preset times T , ,in, is the measured water level of the reservoir after n-1 preset times T;

[0016] Step S140, determining whether n is greater than or equal to two;

[0017] Step S141, is the measured water level of the reservoir after n preset time T; when n is greater than or equal to 2, judge Is the absolute value of less than or equal to , is the set value;

[0018] Step S141a, when The absolute value of is less than or equal to hour, ;

[0019] Step S141b, when The absolute value of and hour, ;when The absolute value of and hour, .

[0020] Furthermore, after step S141b, the method further includes:

[0021] Step S142: when n is less than two, determine the measured water level of the reservoir. Is there an inflection point?

[0022] Step S142a, when the measured water level of the reservoir When a turning point occurs, ;

[0023] Step S142b, when the measured water level of the reservoir There is no turning point and hour, , is the set value, Less than ; When the measured water level of the reservoir There is no turning point and hour, .

[0024] Furthermore, after step S142b, the method further includes:

[0025] Step S150, when the measured water level of the reservoir reaches an inflection point, re-record the measured water level of the reservoir.

[0026] Furthermore, the process of controlling the active load of the i-th generator to reach the active power Pi corresponding to the current adjustment pulse width is specifically as follows:

[0027] A regulating pulse including a current regulating pulse width is sent to the regulating opening inlet of the turbine speed governor to control the active load of the i-th generator to reach an active power Pi corresponding to the current regulating pulse width, wherein the regulating opening inlet includes an increasing opening inlet and a decreasing opening inlet.

[0028] Furthermore, the water level adaptive new energy hydropower generation control system also includes a second acquisition module and an alarm module. The second acquisition module is used to obtain the operating parameters of the i-th generator. When the operating parameters of the i-th generator reach the alarm value, the alarm module is controlled to alarm to remind the operating personnel to find and eliminate the fault.

[0029] Furthermore, the operating parameters include the stator temperature of the i-th generator.

[0030] Furthermore, after the alarm module issues an alarm, it determines whether the stator temperature reaches a preset stop temperature, and if so, automatically shuts down the i-th generator.

[0031] The beneficial effects of the present invention are:

[0032] The invention provides a water level adaptive new energy water conservancy power generation control system which is applied to a hydropower station. The hydropower station includes a reservoir and a first generator, a second generator to an Nth generator which are started in sequence. The water level adaptive new energy water conservancy power generation control system includes a first acquisition module and a calculation module. The first acquisition module is used to obtain the measured water level of the reservoir. ; The calculation module is used to measure the water level of the reservoir Calculate the true water level of the reservoir And perform the following steps to determine the actual water level of the reservoir Whether the upper limit water level of the i-th generator has been reached; if so, start the i-th generator and control the i-th generator to output a locking signal to lock the other started generators except the i-th generator, and according to the actual water level of the reservoir Get the current adjustment pulse width; control the active load of the i-th generator to reach the active power corresponding to the current adjustment pulse width Through the trend of water level changes in the past, the estimated water level is calculated, and combined with the actual measured water level, the real height of the current reservoir water level is accurately calculated, thereby avoiding large errors in water level detection due to the external environment, and thus accurately adjusting the generator to maximize the use of water potential and improve power generation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 A schematic diagram of the flow structure of a water level adaptive new energy hydropower generation control system provided in one embodiment of the present invention. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0035] The serial numbers assigned to the components herein, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in the present invention, unless otherwise specified, include direct and indirect connections (couplings). In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying 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 to the present invention.

[0036] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0037] In the existing water level-based power generation technology, water level gauges are generally used to monitor the current water level. However, the water level gauges are easily affected by external environmental factors during actual use, resulting in inaccurate water level judgment, which in turn cannot ensure that the generator maximizes the use of water potential energy, affecting power generation efficiency.

[0038] like Figure 1 As shown, Figure 1 A schematic diagram of the process structure of a water level adaptive new energy water power generation control system provided by an embodiment of the present invention Figure 1 The water level adaptive new energy water conservancy power generation control system is applied to a hydropower station. The hydropower station includes a reservoir and a first generator, a second generator to an Nth generator that are started in sequence. N is a positive integer. The water level adaptive new energy water conservancy power generation control system includes a first acquisition module and an operation module. In this embodiment, the first acquisition module is a water level meter, which is used to obtain the measured water level of the reservoir. ; The calculation module is used to measure the water level of the reservoir Calculate the true water level of the reservoir .

[0039] It is understandable that the first acquisition module may adopt any one of a float type water level gauge, a fiber optic water level gauge, a tracking type water level gauge, a pressure type water level gauge or an acoustic wave type water level gauge.

[0040] Figure 1 Only the control process of the i-th generator is shown in the figure. The control processes of other generators and Figure 1 The control process for the i-th generator is the same as shown in , and the operation module performs the following steps:

[0041] Step S200, determining the actual water level of the reservoir Whether the upper limit water level of the i-th generator has been reached;

[0042] Step S210: If yes, start the i-th generator and control the i-th generator to output a locking signal to lock other started generators except the i-th generator, where i=1, 2 to N; and according to the actual water level of the reservoir Get the current adjustment pulse width;

[0043] Specifically, the power generation system of the hydropower station includes multiple generators, and the upper water level of each generator is different. To realize the startup of multiple generators according to the water level and adjust their respective active loads, the cooperation of hardware and software is required. In terms of hardware configuration, each generator requires a switch input and a switch output to perform interlocking adjustment between the generators. First, the start / stop of the generators needs to be sorted, and then a switch output of the generator started later is connected to the switch input of the generator started first. When the generator started first receives this switch, it will no longer adjust the active load of its generator operation; in terms of software configuration, according to the startup sequence designed by the hardware, it is ensured that the upper water level of the generator started first is lower than the upper water level of the generator started later, and at the same time, it is also ensured that the lower water level of the generator started first is lower than the lower water level of the generator started later. The water level settings between the generators can differ by a set value in sequence. The specific difference depends on the resolution of the water level measurement and is not limited here.

[0044] For example, if the startup order of the engine groups is set as No. 1, No. 2, and No. 3, when the water level rises from low to high, since the upper limit water level of No. 1 is lower, the water level rise will first meet the upper limit water level of No. 1, that is, the startup water level. When No. 1 is started, it will operate at the rated power of No. 1. After generator No. 1 is started and connected to the grid and operates at rated power, the water level begins to rise. At this time, the active load of generator No. 1 begins to be adjusted. After the active load of generator No. 1 is adjusted to its maximum active power, if the water level still rises, then when the water level rises to the upper limit water level of generator No. 2, generator No. 2 is started, and generator No. 2 outputs the interlocking switch quantity to interlock the active load regulation of generator No. 1, and generator No. 2 begins to adjust the active load. After the active load of generator No. 2 is adjusted to its maximum active power, if the water level still rises, when the water level rises to the upper limit water level of generator No. 3, generator No. 3 is started, and generator No. 3 outputs the interlocking switch quantity to interlock the active load regulation of generator No. 2, and generator No. 3 begins to adjust the active load, and so on, to ensure that during the automatic power generation operation, only one generator adjusts the active load according to the water level change.

[0045] It can be understood that after unit 3 is turned on, if the water level drops due to a decrease in water inflow, the active load of unit 3 will be reduced accordingly. If the water level continues to drop, when the water level drops to the preset value, unit 3 will be shut down. After unit 3 is shut down, the locking switch quantity will be canceled, and unit 2 will perform active load adjustment, and so on.

[0046] Specifically, the i-th generator is any generator in the power generation system of the hydropower station. This scheme controls each generator in the same way. Since the water level rises from low to high, after determining the startup sequence of each generator, it is only necessary to determine the current water level, that is, the actual water level of the reservoir. Whether the upper limit water level of the last generator to be turned on is met. For example, units 1 and 2 are turned on in sequence according to the water level. Since the water level rises from low to high, the upper limit water level of unit 1 will be met first, and unit 1 will be turned on. If the water level rises after unit 1 is turned on, it is determined whether the water level reaches the start-up condition of unit 2. If it reaches it, unit 2 is turned on. The upper limit water level can be understood as the economic operation water level of the i-th generator, or it can be understood as the start-up water level of the i-th generator. This can ensure that the generator operates in the high water level area and make more effective use of water resources.

[0047] The upper water level is the water level line for economic operation set according to the performance of each generator. The value of the upper water level is not limited here. Similarly, the value of the lower water level is not limited.

[0048] Step S220, controlling the active load of the i-th generator to reach the active power corresponding to the current adjustment pulse width .

[0049] Specifically, generally speaking, the actual water level calculated It is greater than the upper limit water level of the i-th generator, that is, higher than the water level line that makes the i-th generator run economically. Therefore, the active power of the generator should be adjusted to meet the water level line of the i-th generator's economic operation. The active load of the i-th generator can be controlled according to the adjustment pulse width. It can also be understood that one adjustment pulse width corresponds to one active power. The calculated current regulating pulse width is used to adjust the guide vane opening of the turbine to control the active power of the i-th generator, so that the current water level rises / drops to a water level line that satisfies the economic operation of the i-th generator.

[0050] It can be understood that increasing the guide vane opening of the turbine can lower the current water level, and decreasing the guide vane opening of the turbine can raise the current water level.

[0051] In some embodiments, the computing module includes the following steps:

[0052] Step S100, setting a preset time T, wherein the preset time T includes equal , to , x is a positive integer, then the measured water level difference of the reservoir in the corresponding time is , to , calculate the rate of change of water level in the corresponding time , to ,in, , where i=1, 2 to x;

[0053] Specifically, the preset time T can be set to thirty minutes, and x can be set to six, that is, From zero to five minutes, Five to ten minutes. Ten to fifteen minutes. Fifteen to twenty minutes. Twenty to twenty-five minutes. It is 25 to 30 minutes, and the measured water level difference of the reservoir during the corresponding time is , , It can be composed of different Get, such as It is equal to the water level detected by the water level gauge at five minutes minus the water level detected by the water level gauge at zero minutes, from which the rate of change of the water level in the corresponding time can be calculated. , , ,like .

[0054] Step S110, calculate the average rate of change of the reservoir water level within a preset time T ;

[0055] Specifically, the average rate of change of the water level in the reservoir within 30 minutes is .

[0056] Step S120, calculating the predicted change rate of the reservoir water level after n preset times T , , to is the weight, where ,and >…> > ;

[0057] Specifically, the predicted change rate of the reservoir water level after n preset times T is Obtained by weighted average, , to is the weight, and , to Can be obtained from experience; assuming n=3, , =0.3, , then after three thirty minutes, ,in, represents the average rate of change of water level in the reservoir during the first thirty minutes, represents the average rate of change of the water level in the reservoir during the second thirty minutes, It represents the average rate of change of water level in the reservoir during the third thirty minutes.

[0058] Step S130, calculate the predicted water level of the reservoir after n preset times T , ,in, is the measured water level of the reservoir after n-1 preset times T;

[0059] Specifically, assuming n=3, the predicted water levels of three reservoirs thirty minutes later are ,in Measured water levels of the reservoirs after two thirty-minute intervals.

[0060] Step S140, determining whether n is greater than or equal to two;

[0061] When n is greater than or equal to 2, it means that the measured water level of the reservoir has been in the same change trend for at least half an hour, indicating that it has reached a stable state and there will be no turning point. At this time, the actual water level of the reservoir calculated in step S141 shall prevail; when n is less than 2, it means that the measured water level of the reservoir The recording time does not exceed two thirty minutes, the data is small, and the water level change may be unstable. At this time, the actual water level of the reservoir calculated in step S142 shall prevail.

[0062] Step S141, is the measured water level of the reservoir after n preset time T; when n is greater than or equal to 2, judge Is the absolute value of less than or equal to , is the set value;

[0063] Specifically, assuming n is three, then is the measured water level of the reservoir after three thirty minutes; assuming is 0.1, then we need to judge Is the absolute value of less than or equal to 0.1?

[0064] Step S141a, when The absolute value of is less than or equal to hour, ;

[0065] when When the absolute value of is less than or equal to 0.1, it means that the predicted water level of the reservoir and measuring water levels in reservoirs The difference is not big. At this time, the calculated value is used as the standard, and the actual water level of the reservoir is , thereby avoiding large errors in water level detection due to the external environment, and accurately adjusting the generator to maximize the use of water potential and improve power generation efficiency.

[0066] Step S141b, when the measured water level of the reservoir There is no turning point and hour, , is the set value, Less than ; When the measured water level of the reservoir There is no turning point and hour, .

[0067] when The absolute value of is greater than 0.1 and When and measuring water levels in reservoirs The difference is large. At this time, the predicted water level of the reservoir and reservoir are inaccurate. At this time, based on the calculated value, the actual water level of the reservoir = ;when The absolute value of is greater than 0.1 and When and measuring water levels in reservoirs The difference is large. At this time, the predicted water level of the reservoir and measuring water levels in reservoirs are all inaccurate. At this time, the calculated value is used as the basis, and the actual water level of the reservoir is = .

[0068] In a further embodiment, after step S141b, the following steps are further included:

[0069] Step S142: when n is less than two, determine the measured water level of the reservoir. Is there an inflection point?

[0070] Step S142a, when the measured water level of the reservoir When a turning point occurs, ;

[0071] Step S142b, when the measured water level of the reservoir There is no turning point and hour, , is the set value, Less than ; When the measured water level of the reservoir There is no turning point and hour, .

[0072] When the measured water level of the reservoir When no inflection point appears, under the premise that n is less than 2, it means that the inflection point does not appear, but the data is small; assuming is 0.05, when At this time, based on the calculated value, the actual water level of the reservoir is ;when At this time, based on the calculated value, the actual water level of the reservoir is .

[0073] In a further embodiment, after step S142b, the following steps are further included:

[0074] Step S150, when the measured water level of the reservoir reaches an inflection point, re-record the measured water level of the reservoir.

[0075] Specifically, when the water level meter detects an inflection point in the measured water level of the reservoir, it indicates that the usage of the reservoir has changed. The inflection point may be caused by the water inflow into the reservoir being greater than the water discharge, or the water inflow into the reservoir being equal to the water discharge, or the water discharge into the reservoir being greater than the water inflow. At this time, there is a large error in the calculation of the data before the inflection point for the data after the inflection point, so it is necessary to re-record the measured water level of the reservoir.

[0076] It is understandable that when the measured water level of the reservoir When an inflection point appears, the actual water level of the reservoir is recalculated with n=1.

[0077] For example, after the water level adaptive new energy hydropower generation control system is started, the water level of the reservoir is recorded by the water level meter throughout the process. , taking 30 minutes as a time period and every five minutes within the 30 minutes as a node, calculate the rate of change of water level in the corresponding time , where i = 1, 2, 3, 4, 5 and 6, then calculate the average rate of change of reservoir water level within thirty minutes , and so on, the average rate of change of the reservoir water level in the first thirty minutes can be calculated , the average rate of change of reservoir water level in the second thirty minutes The average rate of change of the reservoir water level to the Nth thirty minutes .

[0078] Suppose you want to know the actual water level of the reservoir at the third thirty minutes. , then the predicted change rate of the reservoir water level after three thirty minutes is , the predicted water level of the three reservoirs in thirty minutes , The measured water level of the reservoir calculated for two thirty-minute intervals, is the measured water level of the reservoir detected by the water level gauge after three thirty minutes, assuming , , since n is greater than 2 and The absolute value of is less than or equal to 0.1, then the actual water level of the reservoir at the third thirty minutes Assumptions , , since n is greater than 2 and The absolute value of is greater than 0.1 and , then the actual water level of the reservoir at the third thirty minutes Assumptions , , since n is greater than 2 and The absolute value of is greater than 0.1 and , then the actual water level of the reservoir at three thirty-minute intervals is .

[0079] Before the measured water level of the reservoir reaches an inflection point, the actual water level of the reservoir calculated through the above steps can be used as a benchmark for generator regulation; when the measured water level of the reservoir reaches an inflection point, the measured water level of the reservoir is re-recorded, and the re-recorded measured water level of the reservoir is used as the basis for calculating the actual water level of the reservoir.

[0080] In some embodiments, the process of controlling the active load of the i-th generator to reach the active power Pi corresponding to the current adjustment pulse width is specifically as follows:

[0081] A regulating pulse including a current regulating pulse width is sent to the regulating opening inlet of the turbine speed governor to control the active load of the i-th generator to reach an active power Pi corresponding to the current regulating pulse width, wherein the regulating opening inlet includes an increasing opening inlet and a decreasing opening inlet.

[0082] Specifically, the active load of the i-th generator is controlled by sending a regulating pulse from the regulating opening outlet, which has higher reliability and strong anti-interference ability. Specifically, the regulating opening outlet includes an increasing opening outlet and a decreasing opening outlet. If the turbine guide vane opening is to be increased, a regulating pulse including the current regulating pulse width is sent from the increasing opening outlet. If the turbine guide vane opening is to be decreased, a regulating pulse including the current regulating pulse width is sent from the decreasing opening outlet.

[0083] Calculate the actual water level of the reservoir through the first relationship The corresponding initial active power, where the first relation is , is the initial active power, is the rated active power of the ith generator, h is the actual water level of the reservoir , is the lower water level, is the upper water level; measures the current active power of the i-th generator , and the initial active power and the current active power The current initial active power deviation Δ is obtained by subtracting ; Current initial active power deviation The absolute value is greater than the maximum adjustment step of the active power setting When the current adjustment pulse width is calculated according to the second relational expression, the second relational expression is: , is the current pulse width adjustment, To adjust the pulse width coefficient for active power; when the initial active power deviation Δ The absolute value is less than the maximum adjustment step of the active power setting When the current adjustment pulse width is calculated according to the third relationship, the third relationship is: , Adjust the pulse width for the current.

[0084] Specifically, after the i-th generator is started and connected to the grid, it is converted into a method of adjusting the active load according to the water level. First, the initial active power of the i-th generator after starting is calculated according to the current water level, i.e., the first water level, and the rated active power of the i-th generator. (theoretical value), and then measure the actual active power of the i-th generator at this time (actual value), the initial active power and the current active power The current initial active power deviation is obtained by subtracting , determine the current initial active power deviation Is the absolute value of greater than the maximum adjustment step of the active power setting? If so, the active load regulation is based on the fixed maximum active regulation step length. To adjust, that is, the current adjustment pulse width is fixed, and each adjustment is adjusted according to the current adjustment pulse width calculated by the second relationship to adjust the guide vane opening of the turbine. It can be understood that this is a large-scale adjustment; if not, when the current initial active power deviation of the i-th generator is running The absolute value is greater than the given active dead zone When the active load of the i-th power generation operation is adjusted in a small range, the current adjustment pulse width can be adjusted according to the current initial active deviation To perform the calculation. In order to adjust the active power regulation pulse width coefficient, that is, the change in active load for 1s after adjusting the active load, it is measured on-site by engineering personnel.

[0085] In some embodiments, the water level adaptive new energy hydropower generation control system also includes a second acquisition module and an alarm module. The second acquisition module is used to obtain the operating parameters of the i-th generator. When the operating parameters of the i-th generator reach the alarm value, the alarm module is controlled to alarm to remind the operating personnel to find and eliminate the fault.

[0086] Specifically, during the automatic power generation operation of the hydropower station, the most important thing is to ensure the safety of each generator. To ensure the safety of the generator, its operating parameters must not exceed the limit value given by the manufacturer. If any parameter exceeds the allowable value for a long time, it will cause damage to the generator, which may shorten the life of the generator or even damage it. Specifically, the following parameters should be set strictly according to the parameters given by the manufacturer: the stator current needs to set the alarm value according to the allowable long-term overload current; the rotor current, that is, the excitation current, sets the alarm value at 20% to 80% greater than the rated excitation current; the machine-end voltage, if the machine-end voltage is too high, it will cause the insulation to age quickly and shorten the life of the generator, and the alarm value should be set at 120% UN; set the alarm value of the stator temperature; when any of the above parameters exceeds the alarm value, the alarm module will sound an alarm to remind the operator to find and eliminate the fault.

[0087] In a further embodiment, the operating parameter comprises a stator temperature of the ith generator.

[0088] Specifically, the stator temperature of the generator is the most important parameter for the safe operation of the generator. As long as the temperature of the generator is higher than the alarm value, the alarm module should be immediately controlled to sound an alarm, and the active load will no longer be adjusted in the direction of increasing the stator current.

[0089] In a further embodiment, after the alarm module issues an alarm, it determines whether the stator temperature reaches a preset stop temperature, and if so, the i-th generator is automatically shut down.

[0090] When the stator temperature reaches the set stop temperature, the generator should shut down automatically.

[0091] It can be understood that in the absence of stator temperature measurement, the three-phase current should use full current, measure the 5th and lower harmonic currents, and compare the full current effective value with the given stator limit current to prevent the generator with direct neutral point grounding from being damaged due to stator overheating caused by excessive third harmonic current.

[0092] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0093] The above-described embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that, for a person of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the attached claims.

Claims

1. A water level adaptive new energy water conservancy power generation control system, applied to a hydropower station, the hydropower station includes a reservoir and a first generator, a second generator to an Nth generator that are started in sequence, N is a positive integer, characterized in that: The water level adaptive new energy water conservancy power generation control system comprises a first acquisition module and a calculation module. The first acquisition module is used to obtain the measured water level of the reservoir. The computing module is used to measure the water level of the reservoir Calculate the true water level of the reservoir , and perform the following steps: Step S100, setting a preset time T, wherein the preset time T includes equal , to , x is a positive integer, then the measured water level difference of the reservoir in the corresponding time is , to , calculate the rate of change of water level in the corresponding time , to ,in, , where i=1, 2 to x; Step S110, calculate the average rate of change of the reservoir water level within a preset time T ; Step S120, calculating the predicted change rate of the reservoir water level after n preset times T , , to is the weight, among which, ,and >…> > ; Step S130, calculate the predicted water level of the reservoir after n preset times T , ,in, is the measured water level of the reservoir after n-1 preset times T; Step S140, determining whether n is greater than or equal to two; Step S141, is the measured water level of the reservoir after n preset time T; when n is greater than or equal to 2, judge Is the absolute value of less than or equal to , is the set value; Step S141a, when The absolute value of is less than or equal to hour, ; Step S141b, when The absolute value of and hour, ;when The absolute value of and hour, ; Step S142: when n is less than two, determine the measured water level of the reservoir. Is there an inflection point? Step S142a, when the measured water level of the reservoir When a turning point occurs, ; Step S142b, when the measured water level of the reservoir There is no turning point and hour, , is the set value, Less than ; When the measured water level of the reservoir There is no turning point and hour, ; Step S200, determining the actual water level of the reservoir Whether the upper limit water level of the i-th generator has been reached; Step S210: if yes, start the i-th generator and control the i-th generator to output a locking signal to lock other started generators except the i-th generator, where i=1, 2 to N; and according to the actual water level of the reservoir Get the current adjustment pulse width; Step S220, controlling the active load of the i-th generator to reach the active power corresponding to the current adjustment pulse width .

2. The water level adaptive new energy water conservancy power generation control system according to claim 1 is characterized in that: After step S142b, the method further includes: Step S150, when the measured water level of the reservoir reaches an inflection point, re-record the measured water level of the reservoir.

3. The water level adaptive new energy water conservancy power generation control system according to claim 1 is characterized in that: The process of controlling the active load of the i-th generator to reach the active power Pi corresponding to the current adjustment pulse width is specifically as follows: A regulating pulse including a current regulating pulse width is sent to the regulating opening inlet of the turbine speed governor to control the active load of the i-th generator to reach an active power Pi corresponding to the current regulating pulse width, wherein the regulating opening inlet includes an increasing opening inlet and a decreasing opening inlet.

4. The water level adaptive new energy water conservancy power generation control system according to claim 1 is characterized in that: The water level adaptive new energy hydropower generation control system also includes a second acquisition module and an alarm module. The second acquisition module is used to obtain the operating parameters of the i-th generator. When the operating parameters of the i-th generator reach the alarm value, the alarm module is controlled to alarm to remind the operating personnel to find and eliminate the fault.

5. The water level adaptive new energy water conservancy power generation control system according to claim 4 is characterized in that: The operating parameters include the stator temperature of the i-th generator.

6. The water level adaptive new energy water conservancy power generation control system according to claim 5 is characterized in that: After the alarm module sounds an alarm, it determines whether the stator temperature reaches a preset stop temperature, and if so, automatically shuts down the i-th generator.

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