Waste heat generator automatic grid-connected system and method

Abstract

The invention discloses an automatic grid-connected system and method for a waste heat generator. The automatic grid-connected system comprises a double-microcomputer automatic grid-connected controller, a double-microcomputer excitation controller, a steam turbine digital electro-hydraulic controller, a steam turbine generator unit and a generator grid-connected switch cabinet. The method comprises the following steps: acquiring information of a power grid voltage, a power grid frequency, a generator voltage and a generator frequency received by a double-microcomputer automatic grid-connected controller, analyzing according to the acquired information, and outputting a first adjusting signal and a second adjusting signal; according to a first adjusting signal and a second adjusting signal output by the double-microcomputer automatic grid-connected controller, the first adjusting signal is used for indicating the double-microcomputer excitation controller to adjust the voltage of the generator, and the second adjusting signal is used for indicating the steam turbine digital electro-hydraulic controller to adjust the frequency of the generator; and analyzing the adjusted generator voltage and generator frequency to obtain prediction data, and realizing automatic grid connection according to the prediction data. According to the invention, automatic grid connection can be realized, real-time tracking and updating of data are ensured, and undisturbed switching is realized.

Description

Technical Field

[0001] The present invention relates to the technical field of grid-connected control, and in particular to an automatic grid-connected system and method for a waste heat generator. Background Art

[0002] Sulfuric acid production systems are basically equipped with waste heat generators. Recycling waste heat in sulfuric acid production can reduce production costs and achieve low-carbon and environmentally friendly production. However, the sulfuric acid system requires the generator to be restarted and connected to the grid every time it is overhauled or stopped. Currently, manual synchronous grid connection and semi-automatic quasi-synchronous grid connection are mainly used. Both methods require manual voltage and frequency adjustment. After the grid connection conditions are basically approached, manual or semi-automatic grid connection operation is entered. Both methods have the problem of easy data loss and inability to connect to the grid safely and smoothly. Summary of the invention

[0003] In view of the problems of easy data loss and unstable grid connection in the prior art, the present invention provides a waste heat generator automatic grid connection system and method, which can realize automatic grid connection while ensuring real-time tracking and updating of data and achieving disturbance-free switching.

[0004] To achieve the above object, the present invention can be carried out by adopting the following technical solutions:

[0005] In a first aspect, the present invention provides a waste heat generator automatic grid-connected system, comprising:

[0006] Dual microcomputer automatic grid-connected controller, dual microcomputer excitation controller, steam turbine digital electro-hydraulic controller, steam turbine generator set, generator grid-connected switch cabinet;

[0007] Among them, the dual microcomputer automatic grid-connected controller is connected to the dual microcomputer excitation controller through the first output end, the dual microcomputer automatic grid-connected controller is connected to the steam turbine digital electro-hydraulic controller through the second output end, the dual microcomputer excitation controller is connected to the steam turbine generator set, the steam turbine digital electro-hydraulic controller is connected to the steam turbine generator set, the steam turbine generator set is connected to the generator grid-connected switch cabinet, and the generator grid-connected switch cabinet is connected to the dual microcomputer automatic grid-connected controller.

[0008] As in the above-mentioned waste heat generator automatic grid-connected system, further, the dual microcomputer automatic grid-connected controller receives the grid voltage, grid frequency, generator voltage and generator frequency, the first output end outputs the grid voltage and / or the generator voltage, the second output end is the frequency output end, and the frequency output end outputs the grid frequency and / or the generator frequency.

[0009] In a second aspect, the present invention provides a method for automatically connecting a waste heat generator to the grid, using the above-mentioned automatic connecting system for connecting a waste heat generator to the grid, which comprises the following steps:

[0010] Acquire the information of the grid voltage, grid frequency, generator voltage and generator frequency received by the dual microcomputer automatic grid-connected controller, and output the first adjustment signal and the second adjustment signal after analyzing the acquired information;

[0011] According to the first adjustment signal and the second adjustment signal output by the dual microcomputer automatic grid-connected controller, the first adjustment signal is used to instruct the dual microcomputer excitation controller to adjust the generator voltage, and the second adjustment signal is used to instruct the steam turbine digital electro-hydraulic controller to adjust the generator frequency;

[0012] The adjusted generator voltage and generator frequency are analyzed to obtain prediction data, and automatic grid connection is achieved based on the prediction data.

[0013] As in the above-mentioned method for automatically connecting a waste heat generator to the grid, further, analyzing the adjusted generator voltage and generator frequency to obtain prediction data comprises the following steps:

[0014] Obtain information on generator voltage and generator frequency before and after adjustment;

[0015] The voltage difference data is obtained according to the information of the generator voltage before and after the adjustment, and the frequency difference data is obtained according to the information of the generator frequency before and after the adjustment;

[0016] The phase difference data is obtained, and the prediction data is obtained by analyzing the voltage difference data, the frequency difference data and the phase difference data.

[0017] As in the above-mentioned method for automatically connecting a waste heat generator to the grid, further, the automatic connection to the grid according to the prediction data comprises the following steps:

[0018] Compare the information of the generator voltage in the prediction data with the voltage threshold;

[0019] If the generator voltage is greater than the voltage threshold, a first control instruction is output, and the first control instruction is used to instruct the generator grid-connected switch cabinet to close the switch to complete the grid connection;

[0020] If the generator voltage is less than the voltage threshold, a second control instruction is output, and the second control instruction is used to instruct the external switch to close the switch to complete the grid connection.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1. The dual microcomputer excitation controller of the present invention adopts redundant configuration, and the data of the two microcomputers are tracked and updated in real time, so that disturbance-free switching can be achieved;

[0023] 2. The present invention tracks the grid voltage and frequency in real time and quickly adjusts the generator set to be connected to the grid so that it enters the grid-connected area at the fastest speed, thereby ensuring that the synchronization point is captured quickly and accurately to implement grid connection. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0025] Figure 1 A schematic diagram of the structure of a grid-connected system according to an embodiment of the present invention;

[0026] Figure 2 A schematic diagram of a grid connection method according to an embodiment of the present invention;

[0027] Figure 3 A grid connection flow chart of an embodiment of the present invention;

[0028] Among them, 1. Dual microcomputer automatic grid-connected controller; 2. Dual microcomputer excitation controller; 3. Steam turbine digital electro-hydraulic controller; 4. Steam turbine generator set; 5. Generator grid-connected switch cabinet; SW-1, external switch. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0030] Example:

[0031] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations of the embodiments of the present invention are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0032] It should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0033] In the description of the present invention, "multiple" means at least two, such as two, three, etc., unless otherwise clearly defined. In addition, unless otherwise clearly defined and defined, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] 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.

[0035] In the first aspect, the present invention provides an automatic grid-connected system for a waste heat generator, which includes a dual-microcomputer automatic grid-connected controller 1, a dual-microcomputer excitation controller 2, a steam turbine digital electro-hydraulic controller 3, a steam turbine generator set 4, and a generator grid-connected switch cabinet 5. The dual-microcomputer automatic grid-connected controller 1 is connected to the dual-microcomputer excitation controller 2 through a first output terminal, the dual-microcomputer automatic grid-connected controller 1 is connected to the steam turbine digital electro-hydraulic controller 3 through a second output terminal, the dual-microcomputer excitation controller 2 is connected to the steam turbine generator set 4, the steam turbine digital electro-hydraulic controller 3 is connected to the steam turbine generator set 4, the steam turbine generator set 4 is connected to the generator grid-connected switch cabinet 5, and the generator grid-connected switch cabinet 5 is connected to the dual-microcomputer automatic grid-connected controller 1.

[0036] Specifically, see Figure 1The dual microcomputer automatic grid-connected controller 1 of the present invention is composed of two independent microcomputer controllers, which comprehensively analyze the received grid voltage and frequency, generator voltage and frequency, and then output the data information from the first output terminal to the dual microcomputer excitation controller 2. The excitation controller quickly adjusts according to the received data information. Since the dual microcomputer excitation controllers 2 are independent of each other, a redundant configuration can be adopted, that is, when one excitation controller fails or needs to be suspended, the other excitation controller can immediately intervene in the operation, and the data of the two excitation controllers can track and update each other in real time, so that it is convenient to realize disturbance-free switching without losing its data. At the same time, the dual The second output end of the microcomputer automatic grid-connected controller 1 outputs the data information to the steam turbine digital electro-hydraulic controller 3, and the steam turbine digital electro-hydraulic controller 3 then compares, analyzes and adjusts the received data information. Subsequently, the dual microcomputer excitation controller 2 and the steam turbine digital electro-hydraulic controller 3 transmit the adjusted information data to the steam turbine generator set 4, and the steam turbine generator set 4 automatically adjusts accordingly, and finally transmits the adjusted data information to the generator grid-connected switch cabinet 5, and the generator grid-connected switch cabinet 5 feeds back the data information to the dual microcomputer automatic grid-connected controller 1, and the dual microcomputer automatic grid-connected controller 1 controls the generator grid-connected switch cabinet 5 to close the circuit according to the feedback information, thereby realizing automatic grid connection.

[0037] In an embodiment, further, the excitation controller can be selected from the high-end excitation controller of Oulide Model XES-302, which has better performance. Further, according to the actual situation, a 32-bit ARM chip can be selected as the main control chip, or a 32-bit DSP chip can be selected as the main control chip. In this way, all parameter settings can be digitized and displayed on a liquid crystal display, thereby realizing the visualization of data processing information.

[0038] As an optional implementation, in some embodiments, the dual microcomputer automatic grid-connected controller 1 receives the grid voltage, grid frequency, generator voltage and generator frequency, the first output terminal outputs the grid voltage and / or generator voltage, and the second output terminal outputs the grid frequency and / or generator frequency. The dual microcomputer automatic grid-connected controller 1 of the present invention can simultaneously output the voltage and frequency information to the dual microcomputer excitation controller 2 and the steam turbine digital electro-hydraulic controller 3 for comparison, analysis and adjustment, thereby improving the working efficiency of the system.

[0039] In a second aspect, the present invention provides a method for automatically connecting a waste heat generator to the grid, using the above-mentioned automatic connecting system for connecting a waste heat generator to the grid, comprising the following steps:

[0040] The information of the grid voltage, grid frequency, generator voltage and generator frequency received by the dual-microcomputer automatic grid-connected controller is obtained, and a first adjustment signal and a second adjustment signal are output after analysis based on the obtained information; according to the first adjustment signal and the second adjustment signal output by the dual-microcomputer automatic grid-connected controller, the first adjustment signal is used to instruct the dual-microcomputer excitation controller to adjust the generator voltage, and the second adjustment signal is used to instruct the steam turbine digital electro-hydraulic controller to adjust the generator frequency; the adjusted generator voltage and generator frequency are analyzed to obtain predicted data, and automatic grid connection is achieved based on the predicted data.

[0041] Specifically, see Figure 2 .

[0042] Step 110: Obtain information of the grid voltage, grid frequency, generator voltage, and generator frequency received by the dual microcomputer automatic grid-connected controller, and output a first adjustment signal and a second adjustment signal after analyzing the acquired information.

[0043] In this step, the dual microcomputer automatic grid-connected controller collects parameters such as grid voltage, grid frequency, generator voltage, generator frequency, etc. in real time through internal sensors or external measuring equipment. It also analyzes whether the collected parameters exceed the preset thresholds by setting the upper and lower thresholds of voltage and frequency, and finally outputs the corresponding adjustment signal.

[0044] Step 120: According to the first adjustment signal and the second adjustment signal output by the dual microcomputer automatic grid-connected controller, the first adjustment signal is used to instruct the dual microcomputer excitation controller to adjust the generator voltage, and the second adjustment signal is used to instruct the turbine digital electro-hydraulic controller to adjust the generator frequency.

[0045] In this step, after receiving the first adjustment signal, the dual microcomputer excitation controller adjusts the excitation current of the generator according to the first adjustment signal instruction. The change of the excitation current will change the magnetic field strength of the generator, thereby adjusting the magnitude of the generator output voltage. In this process, the excitation controller continuously monitors the generator voltage and adjusts the excitation current as needed to keep the voltage stable. After receiving the second adjustment signal, the steam turbine digital electro-hydraulic controller adjusts the speed of the steam turbine according to the second adjustment signal instruction. The change of the steam turbine speed will directly affect the speed of the generator rotor, thereby adjusting the magnitude of the generator output frequency. In this process, the steam turbine digital electro-hydraulic controller continuously monitors the generator frequency and adjusts the steam turbine speed as needed to keep the frequency stable.

[0046] Step 130: Analyze the adjusted generator voltage and generator frequency to obtain prediction data, and automatically connect to the grid based on the prediction data.

[0047] In this step, it is analyzed whether the adjusted generator voltage and generator frequency are consistent with the grid voltage and grid frequency, or whether the difference between the two is within an acceptable range. If they are consistent or within an acceptable range, the current voltage data and frequency data are used as prediction data, and finally the closing of the generator grid-connected switch cabinet is controlled according to the prediction data to achieve automatic grid connection.

[0048] As an optional implementation, in some embodiments, analyzing the adjusted generator voltage and generator frequency to obtain prediction data includes the following steps:

[0049] The information of the generator voltage and the generator frequency before and after the adjustment is obtained; the voltage difference data is obtained according to the generator voltage before and after the adjustment, and the frequency difference data is obtained according to the generator frequency before and after the adjustment; the phase difference data is obtained, and the prediction data is obtained by analyzing the voltage difference data, the frequency difference data and the phase difference data.

[0050] Step 131: Obtain information on the generator voltage and generator frequency before and after adjustment.

[0051] In this step, the changes of the voltage, frequency and other parameters of the generator can be observed in real time through the monitoring interface of the dual microcomputer excitation controller or the data recording system.

[0052] Step 132: obtaining voltage difference data according to the generator voltage before and after adjustment, and obtaining frequency difference data according to the generator frequency before and after adjustment.

[0053] In this step, the system built-in algorithm can be used to directly subtract the generator voltage and generator frequency before and after adjustment to obtain voltage difference data and frequency difference data.

[0054] Step 133: Acquire phase difference data, and obtain prediction data by analyzing the voltage difference data, the frequency difference data, and the phase difference data.

[0055] In this step, in order to improve the accuracy of automatic grid connection, it is also necessary to obtain the phase difference between the generator and the grid. Similarly, the current data of the grid and the generator can be collected in real time through sensors or external measuring equipment, and the phase difference can be obtained through the system's built-in algorithm based on the measured current data. Finally, the relationship between the voltage difference data, frequency difference data and phase difference data and 0 is compared. If it is equal to 0 or close to 0 (acceptable range), the current data is used as the predicted data.

[0056] Specifically, see Figure 3The core goal of the present invention is to achieve a seamless, fast and stable grid connection process between the generator and the power grid. This process relies on the precise control and adjustment of the generator voltage (Ug), frequency (fg) and the system grid voltage (Us), frequency (fs). The following is a detailed introduction to this process and its key elements:

[0057] 1. Limiting conditions of voltage difference (ΔU) and frequency difference (△f):

[0058] In the process of grid connection, although the voltage difference and frequency difference are not directly controlled targets, they must be controlled within a certain range to ensure the stability and safety of the grid connection process. If the voltage difference or frequency difference is too large, it may cause grid connection failure or equipment damage.

[0059] Therefore, before connecting to the grid, the system will sample and analyze the voltage and frequency of the generator and the grid to ensure that the difference between them is within an acceptable range.

[0060] 2. Phase difference Capture and control:

[0061] Phase difference is a key factor in the grid connection process. Since voltage and frequency are relatively easy to adjust to meet the requirements, the grid connection process can be simplified to finding a phase difference of zero. process.

[0062] When the phase difference between the generator and the grid is zero, it means that the waveforms of the two are completely aligned. At this time, grid connection can achieve seamless connection and avoid current shocks and power fluctuations.

[0063] In order to achieve precise control of the phase difference, the system uses a PID closed-loop control algorithm to adjust the generator's excitation controller and turbine control system. By continuously adjusting the generator's voltage and frequency (although these adjustments are mainly for indirect control of the phase difference), the system can gradually reduce the phase difference until it reaches zero.

[0064] 3. The function of dual microcomputer automatic grid-connected controller:

[0065] The dual microcomputer automatic grid-connected controller is one of the core components of the entire grid-connected device. It is responsible for receiving the voltage and frequency signals from the generator and the power grid, and performing sampling, analysis and processing.

[0066] Based on these signals, the automatic grid-connected controller calculates the current phase difference, voltage difference and frequency difference, and issues adjustment instructions to the excitation controller and turbine control system according to the preset control strategy.

[0067] Through real-time tracking and adjustment, the automatic grid-connected controller can ensure that the phase difference between the generator and the grid is gradually reduced to zero, thereby achieving fast and non-disruptive synchronous grid connection.

[0068] 4. Real-time and stability of the grid-connected process:

[0069] Since the grid-connected process requires real-time tracking and adjustment of the voltage, frequency and phase of the generator, the real-time performance and stability of the system are crucial.

[0070] In order to ensure the smooth progress of the grid connection process, the system needs to adopt high-performance hardware equipment and advanced control algorithms to achieve rapid response and precise control of the generator and grid status.

[0071] In summary, this system achieves fast, non-interruption synchronous connection with the power grid by precisely controlling the voltage, frequency and phase difference of the generator. In practical applications, the system will conduct comprehensive analysis and adjustments based on the real-time data of voltage difference, frequency difference and phase difference to ensure the stability and safety of the grid connection process.

[0072] As an optional implementation, in some embodiments, realizing automatic grid connection according to the prediction data includes the following steps:

[0073] The generator voltage information in the predicted data is compared with the voltage threshold; if the generator voltage is greater than the voltage threshold, a first control instruction is output, and the first control instruction is used to instruct the generator grid-connected switch cabinet to close the switch to complete the grid connection; if the generator voltage is less than the voltage threshold, a second control instruction is output, and the second control instruction is used to instruct the external switch to close the switch to complete the grid connection.

[0074] Specifically, in order to make the generator to be connected to the grid as soon as possible, under normal circumstances, according to the actual size of △U and △f, it is necessary to actively adjust U and f of the generator to be connected, so as to make △U and △f meet the given requirements as soon as possible, and then achieve synchronous connection. Therefore, the adjustment of voltage U and frequency f is also an important function that the synchronous grid-connected controller should have. During the grid-connected operation, there may be a pressure situation (when the information of the generator voltage in the predicted data is greater than the voltage threshold), such as the engine grid connection; there may be a no-pressure situation (when the information of the generator voltage in the predicted data is less than the voltage threshold), such as the incoming line cabinet grid connection when the power supply is restored after a power outage. For the pressure situation, the system will use the generator grid-connected switch cabinet to close the switch to achieve grid connection; however, for the no-pressure situation, the system will use the external switch to close the switch to complete the grid connection.

[0075] In actual operation, speed regulation means adjusting the frequency of the generator. The regulation of voltage U and frequency f is an important and basic function that the synchronous grid-connected controller should have. When synchronizing the unit switches, in order to make the generator to be paralleled and the power grid as soon as possible, it is necessary to actively adjust U and f of the generator to be paralleled according to the actual size of △U and △f, so as to make △U and △f meet the given requirements as soon as possible, and then realize the synchronous paralleling of the generator. Regardless of speed regulation or voltage regulation, the synchronous device uses the method of "fixed frequency and width adjustment" (or "fixed period, pulse width adjustment") to send out adjustment pulses, that is, after each set cycle, the device calculates the output pulse width according to the adjustment model and sends out this output pulse.

[0076] Speed ​​regulation is achieved by applying speed regulation pulses to the speed control terminal of the steam turbine digital electro-hydraulic controller for automatic closed-loop regulation. The system's speed increase and speed decrease setpoint contacts can be used for remote speed increase and decrease control, and PID control is performed through preset programs and parameters.

[0077] Frequency modulation is achieved by applying speed regulation pulses to the output voltage control terminal of the dual microcomputer automatic grid-connected controller for automatic closed-loop regulation. The excitation controller measures the current voltage of the generator as the measurement value of the controller through the voltage transformer (PT) connected to the generator end, and compares it with the voltage set value inside the controller. The thyristor trigger angle is calculated based on the difference between the two. The generator rotor voltage is changed through thyristor rectification, thereby changing the generator rotor current, so that the generator terminal voltage is close to the voltage set value. When the voltage is in closed-loop operation, the voltage set value is changed by increasing or decreasing the magnetic command. The excitation system can automatically adjust the generator terminal voltage, thereby achieving the appearance of the synchronization point and completing the synchronous closing function.

[0078] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0079] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable ordinary technicians in the field to understand the content of the present invention and implement it accordingly, and they cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made based on the essence of the content of the present invention should be included in the protection scope of the present invention.

Claims

1. A waste heat generator automatic grid-connected system, characterized in that: include: Dual microcomputer automatic grid-connected controller, dual microcomputer excitation controller, steam turbine digital electro-hydraulic controller, steam turbine generator set, generator grid-connected switch cabinet; Among them, the dual microcomputer automatic grid-connected controller is connected to the dual microcomputer excitation controller through the first output end, the dual microcomputer automatic grid-connected controller is connected to the steam turbine digital electro-hydraulic controller through the second output end, the dual microcomputer excitation controller is connected to the steam turbine generator set, the steam turbine digital electro-hydraulic controller is connected to the steam turbine generator set, the steam turbine generator set is connected to the generator grid-connected switch cabinet, and the generator grid-connected switch cabinet is connected to the dual microcomputer automatic grid-connected controller.

2. The automatic grid-connected system for waste heat generator according to claim 1, characterized in that: The dual microcomputer automatic grid-connected controller receives grid voltage, grid frequency, generator voltage and generator frequency, the first output end outputs grid voltage and / or generator voltage, the second output end is a frequency output end, and the frequency output end outputs grid frequency and / or generator frequency.

3. A method for automatically connecting a waste heat generator to the grid, using the automatic connecting system for a waste heat generator to the grid as claimed in any one of claims 1 or 2, comprising the following steps: Acquire the information of the grid voltage, grid frequency, generator voltage and generator frequency received by the dual microcomputer automatic grid-connected controller, and output the first adjustment signal and the second adjustment signal after analyzing the acquired information; According to the first adjustment signal and the second adjustment signal output by the dual microcomputer automatic grid-connected controller, the first adjustment signal is used to instruct the dual microcomputer excitation controller to adjust the generator voltage, and the second adjustment signal is used to instruct the steam turbine digital electro-hydraulic controller to adjust the generator frequency; The adjusted generator voltage and generator frequency are analyzed to obtain prediction data, and automatic grid connection is achieved based on the prediction data.

4. The automatic grid-connected method for waste heat generator according to claim 3, characterized in that: The step of analyzing the adjusted generator voltage and generator frequency to obtain prediction data comprises the following steps: Obtain information on generator voltage and generator frequency before and after adjustment; The voltage difference data is obtained according to the information of the generator voltage before and after the adjustment, and the frequency difference data is obtained according to the information of the generator frequency before and after the adjustment; The phase difference data is obtained, and the predicted data is obtained by analyzing the voltage difference data, the frequency difference data and the phase difference data.

5. The automatic grid-connected method for waste heat generator according to claim 3, characterized in that: The automatic grid connection according to the prediction data comprises the following steps: Compare the information of the generator voltage in the prediction data with the voltage threshold; If the generator voltage is greater than the voltage threshold, a first control instruction is output, and the first control instruction is used to instruct the generator grid-connected switch cabinet to close the switch to complete the grid connection; If the generator voltage is less than the voltage threshold, a second control instruction is output, and the second control instruction is used to instruct the external switch to close the switch to complete the grid connection.

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