Sliding mode load frequency control system for time-delayed renewable power system integration model

Abstract

The application provides a sliding mode load frequency control system of a time-delay renewable power system integration model, relates to the technical field of power system regulation, and comprises a renewable power module, an integration module and a data comparison module. The renewable power module comprises a solar power generation system and a thermal power generation system, can convert light energy and heat energy into electric energy, can simultaneously receive light energy and heat energy and convert electric energy, designs an SM controller according to the principle of SM, optimizes LFC by adopting the method of SM, couples the renewable power module and the integration module, compares the data of LFC after optimization with the data of PID, optimizes LFC by adopting the method of SM, can improve the stability of a renewable system with uncertainty and communication delay mismatch, can operate under various load disturbances and communication delays, reduces frequency fluctuation, and can obtain good frequency robust control performance by optimizing LFC by SM.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power system regulation, in particular to a sliding mode load frequency control system of a time-delay renewable power system integrated model. BACKGROUND

[0002] Patent No. CN201810836502.6, a power system load frequency control method, comprising: obtaining the power error and frequency deviation of the power network; using the power error and the frequency deviation, a full-order sliding mode control method is used to calculate the control amount; using the control amount to control the governor of the power station to adjust the load and frequency of the power network. The present application adopts the full-order sliding mode control method to control the governor, compared with the reduced-order sliding mode control method in the prior art, the sliding mode surface is full-order, and the singularity and chattering degree are reduced in the frequency load regulation of the power system. The power system load frequency control device, system, computer equipment and computer readable storage medium provided by the present application also have the above beneficial effects, which will not be described here.

[0003] Patent No. CN201810898054.2, an interconnected power system load frequency control method and device, comprising: obtaining the frequency deviation and tie line power error of the interconnected power system; using the tie line power error and the frequency deviation, an adaptive sliding mode control method is used to calculate the total control amount; using the total control amount to control the governor of the interconnected power system to adjust the frequency and tie line power of the interconnected power system. By obtaining the frequency deviation and tie line power error, an adaptive sliding mode control method is used to calculate the total control amount; using the total control amount to control the governor of the interconnected power system to adjust the frequency and tie line power of the interconnected power system. Finally, the frequency deviation, tie line power error and regional control error can all tend to zero, and the chattering of the tie line power deviation is significantly reduced.

[0004] The above-mentioned patent device uses the delay of load frequency control communication, the effect is not obvious, the stability of the integrated renewable system of uncertainty and communication delay is poor, the frequency fluctuation is large under various load disturbances and communication delay operating conditions, and the above-mentioned two patent controllers cannot realize adaptive time delay adjustment when controlling time delay, and the utilization of renewable energy is too single. SUMMARY

[0005] In view of the deficiencies of the prior art, the present application provides a sliding mode load frequency control system of a time-delay renewable power system integrated model, which solves the problem that the SM method is used to optimize LFC, can improve the stability of the renewable system of uncertainty and communication delay mismatch, and can be used in various load disturbances and communication delay operations.

[0006] In order to achieve the above object, the application is realized by the following technical solutions: a sliding mode load frequency control system of a time-delay renewable power system integration model, the system comprises:

[0007] The renewable power module comprises a solar power generation system and a thermal power generation system, and converts light energy and thermal energy into electric energy;

[0008] The integration module is designed according to the principle of SM, and the LFC is optimized by the method of SM, and the renewable power module is coupled with the integration module;

[0009] The data comparison module compares the data of the LFC after optimization with the PID.

[0010] Preferably, the renewable power module comprises a solar panel, the solar panel is electrically connected with an electric energy converter, sunlight received by the solar panel is converted into electric energy by the electric energy converter, and a part of the electric energy is directly delivered to the power grid for use, and the other part is collected by a battery.

[0011] Preferably, the solar panel absorbs a large amount of heat energy while being irradiated by sunlight, the heat energy is transferred to a heat absorber for transfer, the heat absorber transfers the heat to a hot tank for heating, increases the temperature of the heat, and the heat is converted into electric energy by a steam turbine generator, the waste heat after the electric energy conversion of the steam turbine generator is delivered for secondary use, and the cold liquid is heated and distributed for use.

[0012] Preferably, the integration module comprises an LFC, the LFC is optimized by the method of SM, the SM is designed into an SM controller according to the principle, A i , B i , A di , F i , E i , all are coefficient matrices, g i (t) represents a parameter uncertainty option of a set, satisfies g i (t)≤hi, hi is a constant, C i ′ 1 can be obtained by the method of pole placement, so that the SM setting is bounded stable;

[0013]

[0014]

[0015] Preferably, the taking is a Lyapunov function of the system, and the formula is obtained by taking Since the minimum eigenvalue of the positive definite matrix Q is λ min(Q)>0, at this time the Lyapunov function is negative, that is Therefore, the system is stable.

[0016] Preferably, the SM controller makes the SM control adaptive, wherein is the estimated value of the disturbance F, and the adaptive rate is designed as At this time, the system satisfies the sliding mode reachable condition.

[0017]

[0018]

[0019] Preferably, the data comparison includes PID control simulation, the PID control has certain suppression ability to the disturbance, but the control of system response and the elimination of system disturbance are considered at the same time, the suppression ability of the disturbance is limited to a certain extent, the steady-state error occurs, the FLC adaptive controller of the SM optimization considers the control of system response and the elimination of system disturbance separately, the disturbance elimination ability is strong, the frequency deviation and control deviation range of the power system is small.

[0020] (I) beneficial effects

[0021] The application provides a sliding mode load frequency control system of a time-delay renewable power system integrated model.

[0022] The application has the following beneficial effects:

[0023] 1. The renewable energy source using light energy is used, sunlight is received by the solar panel, the solar panel is electrically connected with the converter, when sunlight irradiates the solar panel, the solar panel absorbs sunlight, converts the received sunlight into electric energy through the converter, part of the electric energy is transmitted to the power grid for direct use, part of the electric energy can be collected in the storage battery for storage, when sunlight irradiates the solar panel, the solar panel generates a large amount of heat, the heat of the solar panel can be recycled, the heat is heated through the heating tank, and then the heat is converted into electric energy by the steam turbine generator and transmitted to the power grid for use, part of the heat after conversion can be recycled to the storage tank for storage and heating and distribution of liquid, the conversion of electric energy from light energy and heat energy is realized, the utilization of renewable resources is improved.

[0024] 2, The SM method is used for optimizing the LFC, relative to the original DIP controller, the stability of the renewable system with uncertainty and communication delay mismatch can be improved, in addition, the output power of the generator set can also be based on the integrated model to actively respond to the system frequency change, finally, the proposed control strategy is effectively proved through experiment, can be used in various load disturbance and communication delay, reduce frequency fluctuation, SM optimization of LFC can obtain good frequency robust control performance. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 It is a schematic diagram of the system of the application.

[0026] Figure 2 It is a frequency control model diagram according to the application. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the application will be clearly and completely described below with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, not all. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the application.

[0028] Embodiment one:

[0029] As shown in the figure, the sliding mode load frequency control system of the time delay renewable power system integrated model, the system comprises: Figure 1

[0030] Renewable power module, the renewable power module comprises a solar power generation system and a thermal power generation system, which converts light energy and heat energy into electric energy;

[0031] Integrated module, according to the principle of SM, the SM controller is designed, the LFC is optimized by the method of SM, the renewable power module is coupled with the integrated module;

[0032] Data comparison module, compare the data of LFC optimization with PID.

[0033] Embodiment two:

[0034] As shown in the figure, the sliding mode load frequency control system of the time delay renewable power system integrated model, the system comprises: Figure 1 ​As shown, the renewable energy module includes solar panels, which are electrically connected to a power converter. The solar panels receive sunlight, which is converted into electrical energy by the converter. Part of the electrical energy is directly fed into the power grid, while the other part is collected by a battery. While being exposed to sunlight, the solar panels absorb a large amount of heat energy, which is transferred to a heat absorber for further processing. The heat absorber then transfers the heat to a heating tank for heating, increasing the temperature. This heat is then converted into thermal energy by a steam turbine generator. The waste heat from the power conversion is reused to heat and distribute coolant. This renewable energy module utilizes solar power. The solar panel receives sunlight and is electrically connected to the converter. When sunlight shines on the solar panel, it absorbs the sunlight and converts it into electrical energy through the converter. Part of the electrical energy is transmitted to the power grid for direct use, while the rest can be collected and stored in a battery. The solar panel generates a large amount of heat when sunlight shines on it. This heat can be recovered, heated in a heating tank, and then converted into electrical energy by a steam turbine generator and transmitted to the power grid for use. Some of the converted heat can be recovered and stored in a storage tank for heating and distribution of liquids.

[0035] Example 3:

[0036] like Figure 1 As shown, the aggregation module includes LFC, which is optimized using the SM method. SM is designed as an SM controller based on the principle. A i B i A di F i E i Both are coefficient matrices, g i (t) represents the set of indeterminate options, satisfying g i (t)≤hi, where hi is a constant, C′ i1 This can be achieved through pole placement, making the SM setting bounded and stable;

[0037]

[0038]

[0039] Pick Let Lyapunov be the system's Lyapunov function, and substituting it into the formula yields... Since the smallest eigenvalue of the positive definite matrix Q is λ min (Q)>0, at which point the Lyapunov function is negative definite, i.e. Therefore, the system is stable. Changing the SM controller to make it adaptive, in the formula... To estimate the disturbance F, design an adaptive rate. At that time, the system satisfies the sliding mode reachability condition;

[0040]

[0041]

[0042] Data comparison includes PID control simulation, PID controller has certain suppression ability to disturbance, but the control of system response and the elimination of system disturbance are considered at the same time, which limits the disturbance suppression ability to a certain extent, and steady-state error occurs, the FLC adaptive controller optimized by SM considers the control of system response and the elimination of system disturbance separately, and has strong disturbance elimination ability, and the frequency deviation and control deviation range of power system is small.

[0043] It should be noted that, in this document, relational terms such as first and second and the like can be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. The terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus. By way of example, an element preceded by "comprises... a" does not, without more constraints, foreclose the existence of additional identical elements in the process, method, article, or apparatus that comprises the element. By using terminal to view the recorded photos and videos, selecting the required photos and videos, decomposing the selected videos through the terminal, decomposing the videos into photos, selecting the required decomposed photos again, arranging all the required photos, performing low-pass filtering method first to remove noise in the graph and enhance high-frequency signals such as edge, so that the blurred picture becomes clear, and then using the spatial image enhancement method to correct gray level, gray scale transformation and histogram correction, etc., the photos are processed by image enhancement, and when there are dynamic blur photos, the terminal classifies them and performs dynamic blur restoration processing.

[0044] Although embodiments of the present application have been shown and described, it is to be understood that various modifications, substitutions, replacements and changes can be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A sliding mode load frequency control system for a time-delayed renewable power system integration model, characterized by, The system comprises: A regenerative power module, which comprises a solar power generation system and a thermal power generation system, converts light energy and heat energy into electric energy; An integrated module, which designs an SM controller according to the principle of SM, optimizes LFC by using the method of SM, and couples the regenerative power module with the integrated module; A data comparison module, which compares the data of LFC after optimization with that of PID; The integrated module comprises an LFC, which is optimized by a method of SM, which is designed as a SM controller according to the principle, A i , B i , A ii , F i , E i , all are coefficient matrices, g i (t) represents a parameter uncertainty option of the set, which satisfies g i (t)≤hi, hi is a constant, C′ i1 is obtained by a method of pole placement, so that the SM setting is bounded stable; Take is the Lyapunov function of the system, substituting the formula gives Since the minimum eigenvalue of the positive definite matrix Q is λ min (Q) > 0, at this time the Lyapunov function is negative, that is Therefore, the system is stable.

2. The sliding mode load frequency control system for a time-delay renewable power system integration model according to claim 1, characterized in that: The regenerative power module comprises a solar panel, which is electrically connected with an electric energy converter, and the sunlight received by the solar panel is converted into electric energy by the electric energy converter, and part of the electric energy is directly delivered to the power grid for use, and the other part is collected by the battery.

3. The sliding mode load frequency control system for a time-delay renewable power system integration model according to claim 2, characterized in that: The solar panel absorbs a large amount of heat energy while being irradiated by sunlight, the heat energy is transferred to the heat absorber for transfer, the heat absorber transfers the heat to the hot tank for heating, increases the temperature of the heat, and the heat is converted into electric energy by the steam turbine generator, the waste heat after the electric energy conversion of the steam turbine generator is delivered for secondary use, and the cold liquid is heated and distributed for use.

4. The sliding mode load frequency control system for a time-delay renewable power system integration model of claim 1, wherein: The SM controller is changed to make the SM control adaptive, where is the estimate of the disturbance F, and the adaptive rate is designed as The system satisfies the sliding mode reachable condition; 5. The sliding mode load frequency control system for time-delay renewable power system integration model of claim 1, wherein: The data comparison includes PID control simulation, the suppression ability of the PID controller is considered for eliminating the system disturbance, the suppression ability of the PID controller is limited, the PID controller is used for simulation test, and the data of the simulation test is compared with that of the SM optimized LFC adaptive controller.

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