A coordinated operation control method and system for a solar thermal power station

Abstract

The present invention discloses a method and a system for coordinated operation control of a solar thermal power station. The method for coordinated operation control of the solar thermal power station includes: obtaining a main control demand signal of a steam generator; using the main control demand signal of the steam generator and relevant measurement information of the solar thermal power station to regulate the cold salt flow rate, the hot salt flow rate and the flow distribution in the solar thermal power station, so as to realize the coordinated operation control of the solar thermal power station. The present invention can solve the problems of large fluctuations in steam pressure and steam temperature and unbalanced molten salt flow rate allocation in existing solar thermal power stations.

Description

Technical Field

[0001] The present invention relates to the technical field of solar thermal power generation, and particularly to a coordinated operation control method and system for a solar thermal power station. Background Art

[0002] Solar thermal power generation is a renewable energy power generation method that combines solar-thermal conversion power generation, large-scale thermal energy storage, and synchronous machine characteristics. It is one of the most promising power generation technologies in the future renewable energy system. Solar thermal power generation has the ability of long-term heat storage and adopts traditional steam turbine-synchronous machine power generation technology, which can meet the technical requirements such as inertia support, fault ride-through, voltage / frequency response of the existing AC synchronous system, and can provide reliable guarantee and support for the green and low-carbon power system, and will play a central role in building a new power system with new energy as the main body. However, since the basic research on solar thermal power in China is still in its infancy, the existing basic theory and actual operation and maintenance experience still need to be improved. In particular, the operation control scheme of solar thermal power stations is still insufficient, and the excellent dynamic response and support capabilities of solar thermal power stations cannot be fully utilized, which will greatly reduce the actual performance of solar thermal power stations and hinder the actual commercial promotion of solar thermal power generation technology.

[0003] In view of the above problems, existing technical personnel mostly focus on the performance improvement and optimization of the front-end heat collection control system of solar thermal power stations, while the control methods of the steam-water system and the heat storage system mostly follow the control technology of traditional thermal power units. However, in actual operation, solar thermal power stations using traditional thermal power control systems have problems such as low ramp rate, large fluctuations in steam pressure and temperature, and unbalanced molten salt flow distribution. Therefore, there is an urgent need for a coordinated operation control method that matches the characteristics of solar thermal power stations and can fully utilize their inherent advantages. Summary of the Invention

[0004] The purpose of the present invention is to provide a coordinated operation control method and system for a solar thermal power station to solve the problems of large fluctuations in steam pressure and temperature and unbalanced molten salt flow distribution in existing solar thermal power stations.

[0005] The technical solution of the present invention to solve the above technical problems is as follows:

[0006] The present invention provides a coordinated operation control method for a solar thermal power station, and the coordinated operation control method for the solar thermal power station includes:

[0007] Obtain the main control demand signal of the steam generator;

[0008] Use the main control demand signal of the steam generator and relevant measurement information of the solar thermal power station to regulate the cold salt flow, hot salt flow, and flow distribution in the solar thermal power station to achieve coordinated operation control of the solar thermal power station.

[0009] Optionally, the main control demand signal of the steam generator is obtained by the following method:

[0010] Obtain an external load demand instruction;

[0011] According to the external load demand instruction, obtain a unit load demand signal and a frequency correction signal;

[0012] According to the unit load demand signal, obtain a steam generator pressure set value;

[0013] According to the unit load demand signal and the frequency correction signal, obtain a steam turbine error signal;

[0014] According to the steam generator pressure set value and the steam turbine error signal, generate an initial main control demand signal for the steam generator;

[0015] Use a feedforward signal to regulate the initial main control demand signal of the steam generator to obtain a main control demand signal for the steam generator.

[0016] Optionally, the relevant measurement information of the solar thermal power plant includes:

[0017] Measured hot salt temperature and measured hot salt mass flow rate.

[0018] Optionally, the regulation of the hot salt flow rate in the solar thermal power plant by using the main control demand signal of the steam generator and the relevant measurement information of the solar thermal power plant includes:

[0019] According to the measured hot salt temperature and the rated temperature, obtain a calorific value correction signal;

[0020] Use the calorific value correction signal to correct the measured hot salt mass flow rate to obtain a corrected mass flow rate signal;

[0021] Use a signal processing function to process the main control demand signal of the steam generator to obtain a processing result;

[0022] Compare the corrected mass flow rate signal and the processing result to obtain a mass flow rate error signal;

[0023] According to the mass flow rate error signal, use a first PI controller to generate a mass flow rate control signal;

[0024] Regulate the hot salt flow rate according to the mass flow rate control signal.

[0025] Optionally, the relevant measurement information of the solar thermal power plant further includes: superheated steam temperature and reheated steam temperature.

[0026] Optionally, the regulation of the cold salt flow rate in the solar thermal power plant by using the main control demand signal of the steam generator and the relevant measurement information of the solar thermal power plant includes:

[0027] Adjust the measured hot salt temperature using a bias signal to obtain the adjusted hot salt temperature;

[0028] Determine whether the adjusted hot salt temperature is within the temperature preset range. If so, form a first temperature error and a second temperature error respectively using the adjusted hot salt temperature and the superheated steam temperature, and use a second PI controller to generate a cold salt pump control signal from the first temperature error and the second temperature error, and adjust the cold salt flow according to the cold salt pump control signal;

[0029] Otherwise, form a first temperature error and a second temperature error respectively using the endpoint temperature values of the temperature preset range and the superheated steam temperature, and use a second PI controller to generate a cold salt pump control signal from the first temperature error and the second temperature error, and adjust the cold salt flow according to the cold salt pump control signal.

[0030] Optionally, the regulation of the cold salt flow in the solar thermal power plant using the steam generator demand master control signal and the relevant measurement information of the solar thermal power plant further includes:

[0031] Adjust the measured hot salt temperature using a bias signal to obtain the adjusted hot salt temperature;

[0032] Determine whether the adjusted hot salt temperature is within the temperature preset range. If so, form a first temperature error and a second temperature error respectively using the adjusted hot salt temperature and the superheated steam temperature, and use a second PI controller to generate a cold salt pump control signal from the first temperature error and the second temperature error, and adjust the cold salt flow according to the cold salt pump control signal;

[0033] Otherwise, process the adjusted hot salt temperature using a perturbation coefficient to obtain a processed hot salt temperature signal, form a first temperature error and a second temperature error respectively using the endpoint temperature values of the temperature preset range and the superheated steam temperature, and use a second PI controller to generate an initial cold salt pump control signal from the first temperature error and the second temperature error, and adjust the cold salt flow according to the initial cold salt pump control signal and the processed hot salt temperature signal.

[0034] Optionally, the regulation of the flow distribution in the solar thermal power plant using the steam generator demand master control signal and the relevant measurement information of the solar thermal power plant includes:

[0035] Regulate the flow distribution in the solar thermal power plant using the superheated steam temperature and the reheated steam temperature.

[0036] Optionally, the regulation of the flow distribution in the solar thermal power plant by using the superheated steam temperature and the reheated steam temperature includes:

[0037] Obtaining a temperature difference signal according to the superheated steam temperature and the reheated steam temperature;

[0038] Using a third PI controller to generate a superheater valve control signal and a reheater valve control signal from the temperature difference signal, wherein the superheater valve control signal and the reheater valve control signal are two signals with opposite trends;

[0039] Using the superheater valve control signal and the reheater valve control signal to achieve the regulation of the flow distribution in the solar thermal power plant.

[0040] The present invention also provides a solar thermal power plant coordinated operation system based on the above-mentioned solar thermal power plant coordinated operation method. The solar thermal power plant coordinated operation system at least includes:

[0041] A main control demand signal acquisition device, which is used to acquire a main control demand signal of the steam generator;

[0042] A coordinated control device, which is used to regulate the cold salt flow rate, the hot salt flow rate and the flow distribution in the solar thermal power plant by using the main control demand signal of the steam generator and the relevant measurement information of the solar thermal power plant, so as to achieve the coordinated operation control of the solar thermal power plant.

[0043] The present invention has the following beneficial effects:

[0044] The present invention can not only maintain the stability of the main steam pressure, but also fully explore the fast load response characteristics of the solar thermal power plant. Moreover, it can well overcome the influence brought by internal and external disturbances such as molten salt temperature and load demand, and realize the efficient regulation of molten salt flow rate and steam temperature. Description of the Drawings

[0045] Figure 1 It is a flowchart of the solar thermal power plant coordinated operation control method of the present invention;

[0046] Figure 2 It is a schematic diagram of the acquisition method of the main control demand signal of the steam generator of the present invention;

[0047] Figure 3 It is a schematic diagram of the hot salt flow rate control structure of the present invention;

[0048] Figure 4 It is a schematic diagram of the cold salt flow rate control structure of the present invention;

[0049] Figure 5 It is a schematic diagram of the flow distribution control structure of the present invention;

[0050] Figure 6 This is the electrical power and main steam pressure diagram of the present invention;

[0051] Figure 7 This is the relative error diagram of power and steam pressure;

[0052] Figure 8 This is the diagram of the temperature change of superheated and reheated steam. Specific embodiments

[0053] The principles and features of the present invention will be described below in conjunction with the accompanying drawings. The examples given are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0054] Example 1

[0055] The present invention provides a coordinated operation control method for a solar thermal power station. Referring to Figure 1 as shown, the coordinated operation control method for the solar thermal power station includes:

[0056] S1: Obtain the main control demand signal of the steam generator;

[0057] Optionally, the main control demand signal of the steam generator is obtained in the following manner:

[0058] Obtain an external load demand instruction; referring to Figure 2 as shown, the external load demand signal of the present invention includes an AGC load signal, a manual signal, etc.

[0059] According to the external load demand instruction, obtain the unit load demand signal and the frequency correction signal;

[0060] Specifically referring to Figure 2 as shown, the AGC load signal and the manual signal are processed by a selector and then sequentially pass through an amplitude modulator, a dynamic amplitude modulator, and a dynamic rate limiter to obtain the rate-limited unit load demand signal ① ULD. The system frequency offset signal Δf is corrected to obtain the frequency correction signal ② FCS.

[0061] According to the unit load demand signal, obtain the steam generator pressure set value;

[0062] Still referring to Figure 2 , on the one hand, the unit load demand signal ① ULD of the present invention passes through a look-up table and is added to the bias signal. The obtained result and the output signal of the pressure setting module enter a selector. After being processed by the selector, it passes through a dynamic rate limiter to obtain the first initial pressure signal p0. The difference between the first initial pressure signal p0 and the measured main steam pressure p m is the steam generator pressure set value Δp.

[0063] According to the unit load demand signal and the frequency correction signal, obtain the steam turbine error signal;

[0064] On the other hand, the unit load demand signal ① ULD undergoes time-delay processing to obtain the second initial pressure signal P0. Meanwhile, the frequency correction signal ② FCS generates a result through the correction coefficient K, and the generated result, together with the second initial pressure signal P0 and the measured electrical power Pe, generates the steam turbine error signal ΔP.

[0065] Generate the initial main control demand signal of the steam generator according to the steam generator pressure set value and the steam turbine error signal;

[0066] After adding the steam generator pressure set value Δp and the steam turbine error signal ΔP, it is processed by a PID controller to obtain the initial main control demand signal of the steam generator.

[0067] To further consider the response speed and anti-interference ability, the present invention takes into account feedforward signals, including the unit load demand signal ① ULD, the frequency correction signal ② FCS, the temperature signal, etc. It is worth mentioning that taking the molten salt temperature on the inlet side as the feedforward signal can effectively reduce the influence of the hot salt temperature disturbance on the change of the main steam pressure.

[0068] Regulate the initial main control demand signal of the steam generator by using the feedforward signal to obtain the main control demand signal of the steam generator.

[0069] Specifically, refer to Figure 2 , respectively perform different processing on the unit load demand signal ① ULD (the same as the subsequent SGS demand main control signal), the frequency correction signal ② FCS, the feed water temperature, and the hot salt temperature in the hot tank, and sum the respective processing results. The generated sum result is added to the initial main control demand signal of the steam generator to obtain the main control demand signal of the steam generator. Note that the preprocessing function parameters of the feedforward input signal depend on the actual situation, and F(x) usually takes a linear function.

[0070] In the present invention, the upper and lower limits of the dynamic limiter are respectively determined by the operating conditions of auxiliary equipment and the minimum operating output of the hot salt pump. And the rate limit signal of the rate limiter is determined according to the thermal stress evaluation result.

[0071] S2: Regulate the cold salt flow rate, hot salt flow rate, and flow distribution in the solar thermal power plant by using the main control demand signal of the steam generator and the relevant measurement information of the solar thermal power plant to achieve coordinated operation control of the solar thermal power plant.

[0072] Here, it should be noted that the main task of the hot salt flow rate control is to control the mass flow rate of the high-temperature molten salt according to the main control demand signal of the steam generator. To consider the influence of the molten salt temperature change, the measured mass flow rate signal is corrected by the measured salt temperature signal.

[0073] In the present invention, the relevant measurement information of the solar thermal power station includes: the measured hot salt temperature and the measured hot salt mass flow rate.

[0074] On this basis, with reference to Figure 3 as shown, regulating the hot salt flow rate in the solar thermal power station by using the steam generator demand master control signal and the relevant measurement information of the solar thermal power station includes:

[0075] According to the measured hot salt temperature T hotsalt and the rated temperature T rated , a calorific value correction signal is obtained;

[0076] Using the calorific value correction signal to correct the measured hot salt mass flow rate m hotsalt to obtain a corrected mass flow rate signal;

[0077] Using the signal processing function F(x) to process the steam generator demand master control signal (SGS demand master control signal) to obtain a processing result;

[0078] Comparing the corrected mass flow rate signal and the processing result (taking the difference) to obtain a mass flow rate error signal;

[0079] According to the mass flow rate error signal, using a first PI controller to generate a mass flow rate control signal;

[0080] Regulating the hot salt flow rate according to the mass flow rate control signal, that is, controlling the opening or closing or the opening size of the hot salt pump.

[0081] In addition, the relevant measurement information of the solar thermal power station in the present invention further includes: the superheated steam temperature and the reheated steam temperature.

[0082] Effective control of the superheated and reheated steam temperatures is an important prerequisite for the efficient operation of the steam turbine. Stable steam temperature is conducive to achieving higher turbine efficiency and reducing the risk of metal fatigue damage of the steam turbine.

[0083] On this basis, with reference to Figure 4 as shown, regulating the cold salt flow rate in the solar thermal power station by using the steam generator demand master control signal and the relevant measurement information of the solar thermal power station in the present invention includes:

[0084] Using a bias signal to regulate the measured hot salt temperature to obtain a regulated hot salt temperature;

[0085] Here, due to various reasons, there is usually a difference between the measured hot salt temperature and the actual hot salt temperature, and this difference is generally called heat loss. Therefore, in order to make up for the influence of the heat loss signal on signal processing, the present invention introduces a bias signal, which is equivalent to the heat loss signal, so that the regulated hot salt temperature is closer to the actual hot salt temperature.

[0086] Judge whether the regulated hot salt temperature is within the preset temperature range. If so, form a first temperature error and a second temperature error by using the regulated hot salt temperature and the superheated steam temperature respectively, and use a second PI controller to generate a cold salt pump control signal based on the first temperature error and the second temperature error, and regulate the cold salt flow according to the cold salt pump control signal;

[0087] Otherwise, form a first temperature error and a second temperature error by using the endpoint temperature values of the preset temperature range and the superheated steam temperature respectively, and use a second PI controller to generate a cold salt pump control signal based on the first temperature error and the second temperature error, and regulate the cold salt flow according to the cold salt pump control signal.

[0088] Specifically, as long as the temperature of the salt storage tank is high enough, the temperature set value is equal to the designed rated temperature. However, if the salt temperature in the hot tank fails to reach the expected value, the temperature set value will be correspondingly limited to a lower level.

[0089] Thus, when regulating the cold salt flow, hot salt and cold salt can be mixed to achieve temperature regulation.

[0090] Optionally, the regulation of the cold salt flow in the solar thermal power plant by using the steam generator demand main control signal and the relevant measurement information of the solar thermal power plant further includes:

[0091] Regulate the measured hot salt temperature by using a bias signal to obtain the regulated hot salt temperature;

[0092] Judge whether the regulated hot salt temperature is within the preset temperature range. If so, form a first temperature error and a second temperature error by using the regulated hot salt temperature and the superheated steam temperature respectively, and use a second PI controller to generate a cold salt pump control signal based on the first temperature error and the second temperature error, and regulate the cold salt flow according to the cold salt pump control signal;

[0093] Otherwise, process the regulated hot salt temperature by using a disturbance coefficient to obtain a processed hot salt temperature signal, form a first temperature error and a second temperature error by using the endpoint temperature values of the preset temperature range and the superheated steam temperature respectively, and use a second PI controller to generate an initial cold salt pump control signal based on the first temperature error and the second temperature error, and regulate the cold salt flow according to the initial cold salt pump control signal and the processed hot salt temperature signal.

[0094] In this way, due to the existence of the perturbation coefficient K2, the regulated hot salt temperature value is regulated by the perturbation coefficient K2 and acts simultaneously with the initial cold salt pump control signal, which can increase the perturbation speed.

[0095] Optionally, the regulation of the flow distribution in the CSP plant by using the main control signal of the steam generator demand and the relevant measurement information of the CSP plant includes:

[0096] Regulating the flow distribution in the CSP plant by using the superheated steam temperature and the reheated steam temperature.

[0097] Reference Figure 5 As shown, the regulation of the flow distribution in the CSP plant by using the superheated steam temperature and the reheated steam temperature to solve the problem of temperature imbalance of the superheated and reheated steam includes:

[0098] Obtaining a temperature difference signal according to the superheated steam temperature and the reheated steam temperature;

[0099] Using a third PI controller to generate a superheater valve control signal and a reheater valve control signal from the temperature difference signal, wherein the superheater valve control signal and the reheater valve control signal are two signals with opposite trends / the signals show opposite trends;

[0100] Using the superheater valve control signal and the reheater valve control signal to achieve the regulation of the flow distribution in the CSP plant.

[0101] The present invention also provides a CSP plant coordinated operation system based on the above CSP plant coordinated operation method, and the CSP plant coordinated operation system at least includes:

[0102] A main control demand signal acquisition device, which is used to acquire the main control demand signal of the steam generator;

[0103] A coordinated control device, which is used to regulate the cold salt flow rate, hot salt flow rate and flow distribution in the CSP plant by using the main control demand signal of the steam generator and the relevant measurement information of the CSP plant to achieve the coordinated operation control of the CSP plant.

[0104] Embodiment 2:

[0105] This implementation case is carried out under cloudy conditions to further illustrate the specific operation principle of the control scheme proposed by the present invention. The typical setting parameters of the key modules are given here Figures 2 - 5 and the control effects under the typical parameter settings are given. The specific information is shown in Tables 1 and 2, reference Figure 6As shown, in this embodiment, the measured active power is used as the load demand input signal, and the coordinated mode is selected as the main control mode. The final obtained active power and pressure control effects are as Figure 7 shown. It can be seen that both the overall power and pressure errors are within ±1%, and the control effect is good. As Figure 8 shown, the molten salt temperature has a step disturbance at 400 s and rises from 545 °C to 555 °C. For the case without superheated steam temperature control, the superheated steam temperature rises rapidly within a few seconds, which will threaten the safe operation of the superheater and other components. In contrast, both the traditional spray desuperheating method and the proposed cold salt regulation method can effectively control the temperature within the specified range within a certain period of time. However, the former requires more time (about 800 s) even with cascade control, while the cold salt regulation method proposed in the present invention only requires about 200 s. In addition, in order to eliminate the influence of traditional spray desuperheating on the thermal efficiency, the reheated steam temperature is adjusted here by redistributing the molten salt flow rate. In this case, the traditional spray desuperheating method may cause the temperature fluctuation of the reheated steam as Figure 8 presented (from 1800 s to 4400 s). As for the drum water level, it increases at the initial stage of the temperature step, but then quickly returns to the normal value. Such results indicate that the temperature feed-forward signal can effectively reduce the influence of temperature disturbance on the key parameters of the steam generator.

[0106] In summary, a coordinated operation control method for a solar thermal power station proposed by the present invention can not only maintain the stability of the main steam pressure while fully exploring the fast load response characteristics of the solar thermal power station, but also better overcome the influence brought by internal and external disturbances such as molten salt temperature, load demand and feed water volume, and realize the efficient regulation of molten salt flow rate, steam temperature and drum water level.

[0107] Table 1 Typical parameters of key modules of the main control system

[0108]

[0109]

[0110] Table 2 Typical parameters of key modules of the sub-control system

[0111]

[0112] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A coordinated operation control method for a solar thermal power station, characterized in that, The coordinated operation control method of the solar thermal power station includes: Obtaining the main control demand signal of the steam generator; Regulating the cold salt flow rate, hot salt flow rate and flow distribution in the solar thermal power station by using the main control demand signal of the steam generator and the relevant measurement information of the solar thermal power station, so as to realize the coordinated operation control of the solar thermal power station; The main control demand signal of the steam generator is obtained in the following way: Obtaining an external load demand instruction; According to the external load demand instruction, obtaining a unit load demand signal and a frequency correction signal; According to the unit load demand signal, obtaining the steam generator pressure set value; According to the unit load demand signal and the frequency correction signal, obtaining a steam turbine error signal; According to the steam generator pressure set value and the steam turbine error signal, generating an initial main control demand signal of the steam generator; Regulating the initial main control demand signal of the steam generator by using a feedforward signal to obtain the main control demand signal of the steam generator; The relevant measurement information of the solar thermal power station includes: Measured hot salt temperature and measured hot salt mass flow rate; The regulation of the hot salt flow rate in the solar thermal power station by using the main control demand signal of the steam generator and the relevant measurement information of the solar thermal power station includes: According to the measured hot salt temperature and the rated temperature, obtaining a calorific value correction signal; Correcting the measured hot salt mass flow rate by using the calorific value correction signal to obtain a corrected mass flow rate signal; Processing the main control demand signal of the steam generator by using a signal processing function to obtain a processing result; Comparing the corrected mass flow rate signal and the processing result to obtain a mass flow rate error signal; According to the mass flow rate error signal, using a first PI controller to generate a mass flow rate control signal; Regulating the hot salt flow rate according to the mass flow rate control signal; The relevant measurement information of the solar thermal power station further includes: Superheated steam temperature and reheated steam temperature.

2. The coordinated operation control method of the solar thermal power station according to claim 1, wherein The regulation of the cold salt flow rate in the solar thermal power station by using the main control demand signal of the steam generator and the relevant measurement information of the solar thermal power station includes: Regulating the measured hot salt temperature by using a bias signal to obtain a regulated hot salt temperature; Judging whether the regulated hot salt temperature is within a temperature preset range. If so, forming a first temperature error and a second temperature error by using the regulated hot salt temperature and the superheated steam temperature and the superheated steam temperature respectively, and using a second PI controller to generate a cold salt pump control signal from the first temperature error and the second temperature error, and regulating the cold salt flow rate according to the cold salt pump control signal; Otherwise, forming a first temperature error and a second temperature error by using the endpoint temperature values of the temperature preset range and the superheated steam temperature and the superheated steam temperature respectively, and using a second PI controller to generate a cold salt pump control signal from the first temperature error and the second temperature error, and regulating the cold salt flow rate according to the cold salt pump control signal.

3. The coordinated operation control method of the solar thermal power station according to claim 1, wherein The regulation of the cold salt flow rate in the solar thermal power station by using the main control demand signal of the steam generator and the relevant measurement information of the solar thermal power station further includes: Regulating the measured hot salt temperature by using a bias signal to obtain a regulated hot salt temperature; Judge whether the regulated hot salt temperature is within the preset temperature range. If so, form a first temperature error and a second temperature error by using the regulated hot salt temperature and the superheated steam temperature and the superheated steam temperature respectively, and use a second PI controller to generate a cold salt pump control signal based on the first temperature error and the second temperature error, and regulate the cold salt flow according to the cold salt pump control signal; Otherwise, process the regulated hot salt temperature by using a disturbance coefficient to obtain a processed hot salt temperature signal, form a first temperature error and a second temperature error by using the endpoint temperature values of the preset temperature range and the superheated steam temperature and the superheated steam temperature respectively, and use a second PI controller to generate an initial cold salt pump control signal based on the first temperature error and the second temperature error, and regulate the cold salt flow according to the initial cold salt pump control signal and the processed hot salt temperature signal.

4. The method for coordinated operation control of a solar thermal power station according to any one of claims 1 to 3, characterized in that, The regulation of the flow distribution in the solar thermal power plant by using the main control demand signal of the steam generator and the relevant measurement information of the solar thermal power plant includes: Regulate the flow distribution in the solar thermal power plant by using the superheated steam temperature and the reheated steam temperature.

5. The coordinated operation control method of the solar thermal power station according to claim 4, wherein The regulation of the flow distribution in the solar thermal power plant by using the superheated steam temperature and the reheated steam temperature includes: Obtain a temperature difference signal according to the superheated steam temperature and the reheated steam temperature; Use a third PI controller to generate a superheater valve control signal and a reheater valve control signal based on the temperature difference signal, wherein the superheater valve control signal and the reheater valve control signal are two signals with opposite trends; Use the superheater valve control signal and the reheater valve control signal to realize the regulation of the flow distribution in the solar thermal power plant.

6. A solar thermal power plant coordinated operation system based on the solar thermal power plant coordinated operation control method according to any one of claims 1-5, characterized in that, The coordinated operation system of the solar thermal power plant at least includes: A main control demand signal acquisition device for acquiring the main control demand signal of the steam generator; A coordinated control device for regulating the cold salt flow, hot salt flow and flow distribution in the solar thermal power plant by using the main control demand signal of the steam generator and the relevant measurement information of the solar thermal power plant to realize the coordinated operation control of the solar thermal power plant.

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