Parallel operation and splitting control method and device of generator set

Abstract

The invention discloses a parallel operation and disconnection control method and device of a generator set. The method comprises the following steps: acquiring voltage, frequency and phase instantaneous values of a power grid and a to-be-connected unit as well as environment temperature and harmonic distortion rate in real time; calculating a voltage difference, a frequency difference, a phase difference and a voltage difference threshold value of the power grid and the to-be-connected unit according to the voltage, the frequency, the phase instantaneous value, the environment temperature and the harmonic distortion rate; according to a voltage difference threshold value dynamically adjusted through the environment temperature and the harmonic distortion rate, a preset frequency difference threshold value and a preset phase difference threshold value, the voltage, the frequency and the phase of the unit to be connected in parallel are adjusted based on a PID algorithm, so that the voltage difference, the frequency difference and the phase difference meet parallel operation triggering conditions, and a parallel operation signal is triggered; and detecting the output power of the generator set after parallel operation, and when the output power meets a splitting triggering condition, triggering a splitting signal and dynamically distributing the output power according to a preset economic dispatching model. The limitation of a traditional fixed threshold value is broken through, and the fuel economy is guaranteed.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power system control, and particularly relates to a method and device for parallel operation and disconnection of a generator set. BACKGROUND

[0002] With the diversification of energy structure and the increasing demand for intelligentization of power systems, the parallel operation and disconnection control technology of generator sets, especially diesel generator sets, has become a key link to ensure the reliability of power grids. Traditional schemes mostly use fixed threshold synchronization, such as voltage difference ≤1%, frequency difference ≤0.05 Hz, etc., and manual intervention load distribution logic, but face bottlenecks in the following scenarios:

[0003] (1) Dynamic load fluctuation: In industrial scenarios, load mutations are frequent, and fixed thresholds are prone to cause synchronization failure or disconnection delay, leading to transient oscillation of power grids;

[0004] (2) New energy grid connection demand: When intermittent energy sources such as wind, light and storage are connected, they need to quickly respond to grid frequency and voltage regulation instructions, and traditional schemes cannot respond quickly;

[0005] (3) Adaptability to extreme environments: In high-cold, high-humidity or electromagnetic interference environments, the hardware signal acquisition error increases, and the reliability of fixed threshold synchronization decreases;

[0006] (4) Multi-machine coordination efficiency: Existing parallel operation systems rely on master-slave mode or proportional distribution, making it difficult to achieve dynamic power optimal distribution, resulting in energy waste. SUMMARY

[0007] The present application provides a method and device for parallel operation and disconnection of a generator set to solve the drawbacks of traditional schemes using fixed threshold synchronization and manual intervention load distribution logic.

[0008] According to one aspect of the present application, a method for parallel operation and disconnection of a generator set is provided, comprising:

[0009] real-time collection of voltage, frequency and phase instantaneous values of a power grid and a to-be-connected generator set, as well as environmental temperature and harmonic distortion rate;

[0010] calculation of voltage difference, frequency difference and phase difference of the power grid and the to-be-connected generator set, and voltage difference threshold value, according to the voltage, the frequency and the phase instantaneous values, and the environmental temperature and the harmonic distortion rate;

[0011] adjustment of the voltage, frequency and phase of the to-be-connected generator set based on a PID algorithm according to the voltage difference threshold value dynamically adjusted by the environmental temperature and the harmonic distortion rate, and preset frequency difference threshold value and preset phase difference threshold value, so that the voltage difference, frequency difference and phase difference meet the parallel operation triggering condition, and a parallel operation signal is triggered;

[0012] Detecting the output power of the generator set after being paralleled, and triggering a decoupling signal and dynamically distributing the output power according to a preset economic dispatching model when the output power meets a decoupling triggering condition.

[0013] Optionally, the calculating the voltage difference, the frequency difference and the phase difference between the power grid and the to-be-parallel generator set and the voltage difference threshold according to the voltage, the frequency and the phase instantaneous value and the ambient temperature and the harmonic distortion rate comprises:

[0014] calculating the voltage difference, the frequency difference and the phase difference between the power grid and the to-be-parallel generator set according to the power grid voltage, the power grid frequency, the power grid phase instantaneous value, the to-be-parallel generator set voltage, the to-be-parallel generator set frequency and the to-be-parallel generator set phase instantaneous value;

[0015] calculating the voltage difference threshold according to the ambient temperature and the harmonic distortion rate.

[0016] Optionally, the voltage difference threshold satisfies the following relationship:

[0017] ΔV th = V base ×(1+k1·T error +k2·H distoriton );

[0018] wherein, V base is an initial safety threshold under a standard working condition, T error is a temperature error coefficient, H distortion is a harmonic distortion rate, k1 is a temperature error proportion factor, and k2 is a harmonic distortion rate proportion factor.

[0019] Optionally, after the calculating the voltage difference, the frequency difference and the phase difference between the power grid and the to-be-parallel generator set and the voltage difference threshold according to the voltage, the frequency and the phase instantaneous value and the ambient temperature and the harmonic distortion rate, the method further comprises:

[0020] dynamically adjusting the voltage difference threshold through the ambient temperature and the harmonic distortion rate.

[0021] Optionally, the dynamically adjusting the voltage difference threshold through the ambient temperature and the harmonic distortion rate comprises:

[0022] when the product of the temperature error proportion factor and the temperature error coefficient is greater than a preset temperature threshold, and / or when the harmonic distortion rate is less than or equal to a preset harmonic distortion rate threshold, increasing the voltage difference threshold;

[0023] when the product of the temperature error proportion factor and the temperature error coefficient is less than or equal to a preset temperature threshold, and / or when the harmonic distortion rate is greater than a preset harmonic distortion rate threshold, decreasing the voltage difference threshold.

[0024] Optionally, the preset economic dispatching model satisfies the following relationship:

[0025]

[0026] wherein a i , b i , c i is a unit fuel cost coefficient, P i is an allocated power.

[0027] Optionally, the parallel operation triggering condition is that the voltage difference is less than or equal to the voltage difference threshold value, the frequency difference is less than or equal to the preset frequency threshold value, and the phase difference is less than or equal to the preset phase threshold value.

[0028] The tripping triggering condition is that the output power is less than a preset total capacity, and / or the output power is a reverse power.

[0029] Optionally, after the parallel operation triggering signal, the method further comprises:

[0030] controlling a solid-state relay of the generator unit to perform a closing operation to complete parallel operation of the generator unit.

[0031] Optionally, after detecting the output power of the generator unit after parallel operation, when the output power satisfies a tripping triggering condition, triggering a tripping signal and allocating the output power according to a preset economic dispatching model, the method further comprises:

[0032] reducing active power of a prime mover and reactive power of an excitation system, and making the active power and the reactive power zero;

[0033] triggering a circuit breaker to open at a current zero point of the generator unit to complete tripping of the generator unit. According to another aspect of the present application, a parallel operation and tripping control device for a generator unit is provided, comprising:

[0034] a collection module, configured to collect voltage, frequency and phase instantaneous values of a power grid and a unit to be parallel operated, and environmental temperature and harmonic distortion rate;

[0035] a calculation module, configured to calculate voltage difference, frequency difference and phase difference of the power grid and the unit to be parallel operated, and a voltage difference threshold value, according to the voltage, the frequency and the phase instantaneous values, and the environmental temperature and the harmonic distortion rate;

[0036] a parallel operation module, configured to adjust voltage, frequency and phase of the unit to be parallel operated based on a PID algorithm, according to the voltage difference threshold value dynamically adjusted by the environmental temperature and the harmonic distortion rate, and preset frequency difference threshold value and preset phase difference threshold value, so that the voltage difference, the frequency difference and the phase difference satisfy a parallel operation triggering condition, and a parallel operation signal is triggered.

[0037] The parallel operation module is used for detecting the output power of the generator set after parallel operation, triggering a parallel operation signal when the output power meets a parallel operation trigger condition, and dynamically distributing the output power according to a preset economic dispatching model.

[0038] The parallel operation and parallel operation release control method and device for the generator set are provided. The voltage, frequency and phase instantaneous values of the power grid and the to-be-parallel-operated generator set and the environmental temperature and harmonic distortion rate are collected in real time; the voltage difference, frequency difference and phase difference of the power grid and the to-be-parallel-operated generator set and the voltage difference threshold value are calculated according to the voltage, frequency and phase instantaneous values and the environmental temperature and harmonic distortion rate; the voltage, frequency and phase of the to-be-parallel-operated generator set are adjusted based on the PID algorithm according to the voltage difference threshold value dynamically adjusted by the environmental temperature and the harmonic distortion rate and the preset frequency difference threshold value and preset phase difference threshold value, so that the voltage difference, frequency difference and phase difference meet the parallel operation trigger condition, and a parallel operation signal is triggered; the output power of the generator set after parallel operation is detected, a parallel operation release signal is triggered when the output power meets a parallel operation release trigger condition, and the output power is dynamically distributed according to a preset economic dispatching model. The technical scheme provided by the embodiment of the application adjusts the threshold value in real time through the environmental parameters and the load state, improves the adaptability in complex scenes, breaks through the limitation of the traditional fixed threshold value, meets the power grid stability and fuel economy through the preset economic dispatching model, realizes the dynamic optimal distribution of power, and avoids energy waste.

[0039] It should be understood that the content described in this part is not intended to identify key or important features of the embodiments of the application, nor is it used to limit the scope of the application. Other features of the application will become apparent from the following description. BRIEF DESCRIPTION OF DRAWINGS

[0040] In order to more clearly illustrate the technical solutions in the embodiments of the application, the drawings needed in the embodiment description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor.

[0041] Figure 1 A flowchart of a parallel operation and parallel operation release control method for a generator set is provided for the embodiments of the application.

[0042] Figure 2 A flowchart of another parallel operation and parallel operation release control method for a generator set is provided for the embodiments of the application.

[0043] Figure 3 A structural schematic diagram of a parallel operation and parallel operation release control device for a generator set is provided for the embodiments of the application.

[0044] Figure 4 A structure schematic diagram of an electronic device of a parallel operation and disconnection control method of a generator set is provided for an embodiment of the present application. DETAILED DESCRIPTION

[0045] In order for those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor should fall within the scope of protection of the present application.

[0046] It should be noted that the terms "first", "second", and the like in the specification and claims of the present application and the above-described drawings are used to distinguish similar objects, and do not necessarily have to be used to describe a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device that includes a series of steps or units does not have to be limited to only those steps or units clearly listed, but can include other steps or units that are not clearly listed or inherent to the process, method, product or device.

[0047] Figure 1 A flowchart of a parallel operation and disconnection control method of a generator set is provided for an embodiment of the present application. The embodiment can be applicable to fast parallel operation and disconnection of a diesel generator set. The method can be performed by a parallel operation and disconnection control device of a generator set. The device can be realized in the form of hardware and / or software. The device can be configured in any electronic device with communication function. Referring to Figure 1 , the method comprises:

[0048] S110, real-time collection of voltage, frequency and phase instantaneous values of a power grid and a to-be-parallel-connected unit, and environmental temperature and harmonic distortion rate.

[0049] Specifically, the grid voltage, grid frequency, grid phase instantaneous value, to-be-parallel-connected unit voltage, to-be-parallel-connected unit frequency and to-be-parallel-connected unit phase instantaneous value are collected in real time through the CAN bus according to a preset sampling frequency. The environmental temperature is collected through a temperature sensor, and the harmonic distortion rate is collected through the CAN bus.

[0050] Wherein, the ambient temperature refers to the real-time temperature of the generator set operating environment. Temperature will affect the insulation performance, heat dissipation efficiency and service life of the equipment, and excessive temperature may cause equipment failure, so it needs to be monitored in real time. The purpose of collecting the above parameters is that real-time matching of voltage, frequency and phase is the core condition of grid connection, and instantaneous value monitoring can avoid grid connection failure or equipment damage caused by parameter deviation. The monitoring of harmonic distortion rate and ambient temperature is used to evaluate the stability of the power grid and the operating state of the equipment, and to prevent failures caused by excessive harmonics or poor heat dissipation. The collected data can be fed back to the control system in real time, and the output of the unit to be connected (such as adjusting the excitation current and speed) is adjusted to synchronize with the power grid, so as to realize smooth grid connection.

[0051] S120, according to the voltage, frequency and phase instantaneous values and the ambient temperature, harmonic distortion rate, calculate the voltage difference, frequency difference and phase difference between the power grid and the unit to be connected, and the voltage difference threshold.

[0052] Specifically, subtract the grid voltage from the voltage of the unit to be connected to get the voltage difference; subtract the grid frequency from the frequency of the unit to be connected to get the frequency difference; subtract the grid phase from the phase of the unit to be connected to get the phase difference; subtract the temperature under standard working condition from the ambient temperature to get the temperature error coefficient, and according to the initial safety threshold under standard working condition, the temperature error coefficient, the harmonic distortion rate, the temperature error proportional factor and the harmonic distortion rate proportional factor, calculate the voltage difference threshold. Wherein, the initial safety threshold under standard working condition, the temperature error proportional factor and the harmonic distortion rate proportional factor can be preset, and the initial safety threshold under standard working condition is usually set to 1%. After the voltage difference threshold is calculated, the value can be dynamically adjusted by the ambient temperature and the harmonic distortion rate.

[0053] Wherein, excessive voltage difference will cause impact current when grid connected, damaging the equipment. For example, if the grid voltage is 220V and the voltage of the unit to be connected is 240V, the voltage difference is 20V, which needs to be compared with the voltage difference threshold to judge whether it is allowed to be connected to the grid. The frequency difference reflects the difference in "synchronization speed" between the two. If the frequency of the unit to be connected is 50.5Hz and the grid frequency is 50Hz, the frequency difference is 0.5Hz, and excessive frequency difference will cause system oscillation after grid connection. The phase difference reflects the "time synchronization" of the two. When the phase difference is close to 0°, the grid connection impact is the smallest; if the phase difference is 90°, it is equivalent to "closing with load" when grid connected, which will produce a large current. The voltage difference threshold is the maximum allowable value of the voltage difference, which is one of the key indicators for judging the grid connection condition. When the calculated voltage difference is less than or equal to the voltage difference threshold, it is considered that the voltage matching degree meets the requirements.

[0054] S130, according to the voltage difference threshold dynamically adjusted by the ambient temperature and the harmonic distortion rate, and the preset frequency difference threshold and the preset phase difference threshold, adjusting the voltage, frequency and phase of the to-be-parallel-connected unit based on the PID algorithm, so that the voltage difference, frequency difference and phase difference meet the parallel connection triggering condition, and triggering the parallel connection signal.

[0055] The frequency difference threshold and the preset phase difference threshold can be preset according to the power grid standard and the generator characteristics. The change of the ambient temperature and the change of the harmonic distortion rate can both cause the change of the voltage difference threshold. For example, when the ambient temperature is higher than the ambient temperature under the standard working condition, the voltage difference threshold is relaxed, and when the ambient temperature is higher than the ambient temperature under the standard working condition, the voltage difference threshold is tightened; or when the harmonic distortion rate exceeds the threshold, the voltage difference threshold is tightened, and vice versa. The new voltage difference threshold can be generated in real time through a preset mathematical model. Optionally, the parallel connection triggering condition is that the voltage difference is less than or equal to the voltage difference threshold, the frequency difference is less than or equal to the preset frequency threshold, and the phase difference is less than or equal to the preset phase threshold, for example, the frequency difference is less than or equal to 0.05 Hz, the voltage difference is less than or equal to 1%, and the phase difference is less than or equal to 2°.

[0056] S140, detecting the output power of the generator unit after parallel connection, and triggering the splitting signal and dynamically distributing the output power according to the preset economic dispatching model when the output power meets the splitting triggering condition.

[0057] The preset economic dispatching model satisfies the following relationship:

[0058] In the formula, a i , b i , c i is the unit fuel cost coefficient, and P i is the distributed power.

[0059] The splitting triggering condition is that the output power is less than the preset total capacity, and / or the output power is the reverse power.

[0060] The preset total capacity is 40% of the current total capacity, that is, the output power decreases to below 40% of the current total capacity. The time when the output power decreases to below 40% of the current total capacity can be predicted by a Long Short-Term Memory Neural Network (LSTM) neural network model, and the splitting preparation is started.

[0061] The embodiment of the present application provides a parallel operation and disconnection control method and device of a generator set. The method comprises the following steps: collecting voltage, frequency and phase instantaneous values of a power grid and a to-be-parallel-connected unit, and environmental temperature and harmonic distortion rate in real time; calculating voltage difference, frequency difference and phase difference of the power grid and the to-be-parallel-connected unit, and a voltage difference threshold value according to the voltage, frequency and phase instantaneous values and the environmental temperature and harmonic distortion rate; adjusting the voltage, frequency and phase of the to-be-parallel-connected unit based on a PID algorithm according to the voltage difference threshold value dynamically adjusted by the environmental temperature and harmonic distortion rate, and preset frequency difference threshold value and preset phase difference threshold value, so that the voltage difference, frequency difference and phase difference meet parallel operation triggering conditions, and a parallel operation signal is triggered; detecting output power of the generator set after parallel operation, and triggering a disconnection signal and dynamically distributing output power according to a preset economic dispatching model when the output power meets disconnection triggering conditions. The technical scheme provided by the embodiment of the present application can improve adaptability in complex scenes by adjusting the threshold value in real time according to environmental parameters and load state, break through the limitation of traditional fixed threshold value, meet power grid stability and fuel economy by the preset economic dispatching model, realize dynamic optimal power distribution, and avoid energy waste.

[0062] In some other embodiments, S120 specifically comprises the following steps:

[0063] According to the power grid voltage, power grid frequency, power grid phase instantaneous value, to-be-parallel-connected unit voltage, to-be-parallel-connected unit frequency and to-be-parallel-connected unit phase instantaneous value, the voltage difference, frequency difference and phase difference of the power grid and the to-be-parallel-connected unit are calculated.

[0064] Specifically, the voltage difference of the power grid and the to-be-parallel-connected unit is obtained by subtracting the to-be-parallel-connected unit voltage from the power grid voltage, the frequency difference of the power grid and the to-be-parallel-connected unit is obtained by subtracting the to-be-parallel-connected unit frequency from the power grid frequency, and the phase difference of the power grid and the to-be-parallel-connected unit is obtained by subtracting the to-be-parallel-connected unit phase from the power grid phase.

[0065] According to the environmental temperature and harmonic distortion rate, the voltage difference threshold value is calculated.

[0066] Specifically, the voltage difference threshold value satisfies the following relationship:

[0067] ΔV th =V base =(1+k1·T error +k2·H distortion );

[0068] Wherein, V base is an initial safety threshold value under a standard working condition, T error is a temperature error coefficient, H distortion is a harmonic distortion rate, k1 is a temperature error proportion factor, and k2 is a harmonic distortion rate proportion factor.

[0069] In some other embodiments, after S120, the following steps are further included:

[0070] The voltage difference threshold is dynamically adjusted by the ambient temperature and the harmonic distortion rate.

[0071] Specifically, when the product of the temperature error proportional factor and the temperature error coefficient is greater than a preset temperature threshold, and / or when the harmonic distortion rate is less than or equal to a preset harmonic distortion rate threshold, the voltage difference threshold is increased; when the product of the temperature error proportional factor and the temperature error coefficient is less than or equal to the preset temperature threshold, and / or when the harmonic distortion rate is greater than the preset harmonic distortion rate threshold, the voltage difference threshold is decreased. Exemplarily, when the harmonic distortion rate is greater than 3%, the voltage difference threshold is automatically tightened to 0.5% to improve the synchronization reliability.

[0072] Figure 2 Another flowchart of the parallel operation and disconnection control method of the generator set is provided for the embodiments of the present application, and the foregoing embodiments are further refined on the basis of the foregoing embodiments. Referring to FIG. 8, the method comprises the following steps. Figure 2 After S130, the method further comprises the following steps:

[0073] S240, controlling the solid-state relay of the generator set to perform a closing operation to complete the parallel operation of the generator set.

[0074] After S140, the method further comprises the following steps:

[0075] S260, reducing the active power of the prime mover and the reactive power of the excitation system to zero, and triggering the disconnection of the circuit breaker at the current zero point of the generator set to complete the disconnection of the generator set.

[0076] Specifically, the output of the prime mover and the output of the excitation system are adjusted, that is, the active power of the prime mover and the reactive power of the excitation system are reduced to realize the zero of the double power within a specified time. The current zero point is detected by a high-precision current sensor, and the circuit breaker is triggered to disconnect at zero current. After disconnection, the bus voltage compensation is automatically started to avoid large grid fluctuations. Exemplarily, the active power is reduced at 30kW / s, the reactive power is reduced at 10kvar / s, and the zero of the double power is realized within 20s, that is, the active power is less than or equal to 1kW, and the reactive power is less than or equal to 0.5kvar. The current zero point is detected by a high-precision current sensor with a resolution of 1mA, and the circuit breaker is triggered to disconnect when the current is less than or equal to 0.1A, and the disconnection time is 8ms. After disconnection, the bus voltage compensation is automatically started to ensure that the grid fluctuation is less than or equal to 2%.

[0077] The technical scheme provided by the embodiments of the present application adjusts the threshold in real time by the environmental parameters and the load state, improves the adaptability in complex scenes, breaks through the limitations of the traditional fixed threshold, meets the grid stability and fuel economy by the preset economic dispatching model, realizes the dynamic optimal distribution of power, and avoids energy waste.

[0078] Figure 3 A structure diagram of a parallel operation and disconnection control device of a generator set is provided for an embodiment of the present application, referring to Figure Figure 2 The device comprises a collection module 310, a calculation module 320, a parallel operation module 330 and a disconnection module 340.

[0079] The collection module 310 is used for collecting voltage, frequency and phase instantaneous values of the power grid and the to-be-parallel-operated set, and environmental temperature and harmonic distortion rate in real time.

[0080] The calculation module 320 is used for calculating voltage difference, frequency difference and phase difference of the power grid and the to-be-parallel-operated set, and voltage difference threshold value according to the voltage, frequency and phase instantaneous values, and the environmental temperature and harmonic distortion rate.

[0081] The parallel operation module 330 is used for adjusting the voltage, frequency and phase of the to-be-parallel-operated set based on a PID algorithm according to the voltage difference threshold value dynamically adjusted by the environmental temperature and harmonic distortion rate, and preset frequency difference threshold value and preset phase difference threshold value, so that the voltage difference, frequency difference and phase difference meet parallel operation triggering conditions, and a parallel operation signal is triggered.

[0082] The disconnection module 340 is used for detecting output power of the generator set after parallel operation, and triggering a disconnection signal and dynamically distributing output power according to a preset economic dispatching model when the output power meets disconnection triggering conditions.

[0083] The parallel operation and disconnection control device of the generator set provided by the embodiment of the present application can execute the parallel operation and disconnection control method of the generator set provided by any embodiment of the present application, and has the function modules and beneficial effects corresponding to the execution method.

[0084] Figure 4 A structure diagram of an electronic device of a parallel operation and disconnection control method of a generator set is provided for an embodiment of the present application. The electronic device is intended to represent various forms of digital computers, such as laptops, desktops, workstations, personal digital assistants, servers, blade servers, mainframes, and other appropriate computers. The electronic device can also represent various forms of mobile devices, such as personal digital processors, cellular telephones, smart phones, wearable devices (such as helmets, glasses, watches, etc.), and other similar computing devices. The components shown herein, their connections and relationships, and their functions, are meant to be examples only, and are not intended to limit the implementations of the present application described and / or claimed in this document.

[0085] As Figure 4As shown, the electronic device 10 includes at least one processor 11, and a memory, such as a read-only memory (ROM) 12, a random access memory (RAM) 13, etc., communicatively connected to the at least one processor 11, where the memory stores a computer program executable by the at least one processor. The processor 11 can perform various appropriate actions and processes according to the computer program stored in the read-only memory (ROM) 12 or loaded into the random access memory (RAM) 13 from the storage unit 18. In the RAM 13, various programs and data required for the operation of the electronic device 10 can also be stored. The processor 11, the ROM 12, and the RAM 13 are connected to each other through a bus 14. An input / output (I / O) interface 15 is also connected to the bus 14.

[0086] Various components in the electronic device 10 are connected to the I / O interface 15, including an input unit 16, such as a keyboard, a mouse, etc., an output unit 17, such as various types of displays, a speaker, etc., a storage unit 18, such as a magnetic disk, an optical disk, etc., and a communication unit 19, such as a network card, a modem, a wireless communication transceiver, etc. The communication unit 19 allows the electronic device 10 to exchange information / data with other devices through a computer network, such as the Internet, and / or various telecommunication networks.

[0087] The processor 11 can be various general and / or special-purpose processing components with processing and computing capabilities. Some examples of the processor 11 include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various special-purpose artificial intelligence (AI) computing chips, various processors running machine learning model algorithms, a digital signal processor (DSP), and any appropriate processor, controller, microcontroller, etc. The processor 11 performs various methods and processes described above, such as a method of parallel operation and parallel operation control of a generator set.

[0088] In some embodiments, the method of parallel operation and parallel operation control of a generator set can be implemented as a computer program tangibly embodied in a computer readable storage medium, such as the storage unit 18. In some embodiments, part or all of the computer program can be loaded and / or installed onto the electronic device 10 via the ROM 12 and / or the communication unit 19. When the computer program is loaded into the RAM 13 and executed by the processor 11, one or more steps of the method of parallel operation and parallel operation control of a generator set described above can be performed. Alternatively, in other embodiments, the processor 11 can be configured to perform the method of parallel operation and parallel operation control of a generator set by any other appropriate means, such as by means of firmware.

[0089] The various embodiments of the systems and techniques described above can be implemented in digital electronic circuitry, integrated circuitry, a field programmable gate array (FPGA), an application specific integrated circuit (ASIC), a system on a chip (SOC), a load programmable logic device (CPLD), computer hardware, firmware, software, and / or combinations thereof. These various embodiments can include implementation in one or more computer programs that are executable and / or interpretable on a programmable system including at least one programmable processor, which can be special or general purpose, coupled to receive data and instructions from, and to transmit data and instructions to, a storage system, at least one input device, and at least one output device.

[0090] Computer programs used to implement the processes of the application can be written in any combination of one or more programming languages. These computer programs can be provided to a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus, such that the computer program

[0091] In the context of the present application, a computer-readable storage medium can be a tangible medium that can contain or store computer programs for use by or in connection with an instruction execution system, apparatus, or device. Computer-readable storage media can include, but are not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing. Alternatively, a computer-readable storage medium can be a machine-readable signal medium. More specific examples of the machine-readable storage medium will include one or more lines of electrical connections, portable computer disks, hard disk drives, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or Flash memory), optical fibers, portable compact disc read-only memories (CD-ROMs), optical storage devices, magnetic storage devices, or any suitable combination of the foregoing.

[0092] To provide for interaction with a user, the systems and techniques described here can be implemented on an electronic device having a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to the user and a keyboard and a pointing device (e.g., a mouse or a trackball) by which the user can provide input to the electronic device. Other kinds of devices can be used to provide for interaction with a user as well; for example, feedback provided to the user can be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user can be received in any form, including acoustic, speech, or tactile input.

[0093] The systems and techniques described here can be implemented in a computing system that includes a back end component (e.g., as a data server), or that includes a middleware component (e.g., an application server), or that includes a front end component (e.g., a user computer having a graphical user interface or a Web browser through which a user can interact with an implementation of the systems and techniques described here), or any combination of such back end, middleware, or front end components. The components of the system can be interconnected by any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include a local area network (LAN), a wide area network (WAN), a blockchain network, and the Internet.

[0094] The computing system can include clients and servers. A client and server are generally remote from each other and typically interact through a communication network. The relationship of client and server arises by virtue of computer programs running on the respective computers and having a client-server relationship to each other. A server can be a cloud server, also known as a cloud computing server or cloud host, which is a host product in the cloud computing service system, to solve the defects of large management difficulty and weak business scalability in traditional physical host and VPS service.

[0095] It should be understood that the various forms of flow shown above can be re-ordered, added to, or deleted from without departing from the scope of the present disclosure. For example, the steps recited in the present disclosure can be executed in parallel, executed in sequence, or executed in a different order, as long as the desired results of the present disclosure are achieved, and the present disclosure is not limited herein.

[0096] The specific embodiments described above are not intended to be limiting, and persons skilled in the art will appreciate that various modifications, combinations, sub-combinations and alternatives can be made to the specific embodiments without departing from the spirit and principles of the disclosure. Accordingly, the disclosure is not limited to the specific embodiments described above, but only by the scope of the appended claims.

Claims

1. A parallel operation and disconnection control method of a generator set, characterized by, The method comprises the steps of: collecting the voltage, frequency and phase instantaneous values of the power grid and the to-be-connected unit, and the ambient temperature and harmonic distortion rate; calculating the voltage difference, frequency difference and phase difference between the power grid and the to-be-connected unit, and the voltage difference threshold value according to the voltage, frequency and phase instantaneous values and the ambient temperature and harmonic distortion rate; adjusting the voltage, frequency and phase of the to-be-connected unit based on the PID algorithm according to the voltage difference threshold value dynamically adjusted by the ambient temperature and the harmonic distortion rate, and the preset frequency difference threshold value and preset phase difference threshold value, so that the voltage difference, frequency difference and phase difference meet the connection trigger condition, and a connection signal is triggered; detecting the output power of the generator set after connection, and triggering a disconnection signal and dynamically distributing the output power according to a preset economic dispatching model when the output power meets the disconnection trigger condition.

2. The method of claim 1, wherein, The method comprises the steps of: calculating the voltage difference, frequency difference and phase difference between the power grid and the to-be-connected unit according to the voltage, frequency and phase instantaneous values and the ambient temperature and harmonic distortion rate; calculating the voltage difference threshold value according to the ambient temperature and the harmonic distortion rate.

3. The method of claim 2, wherein, The voltage difference threshold value satisfies the following relationship: ΔV th = V base × (1 + k1 · T error + k2 · H distortion ); Wherein, V base is the initial safety threshold under standard working conditions, T error is the temperature error coefficient, H distortion is the harmonic distortion rate, k1 is the temperature error proportion factor, and k2 is the harmonic distortion rate proportion factor.

4. The method of claim 1, wherein, After the step of calculating the voltage difference, frequency difference and phase difference between the power grid and the to-be-connected unit according to the voltage, frequency and phase instantaneous values and the ambient temperature and harmonic distortion rate, the method further comprises the step of: dynamically adjusting the voltage difference threshold value by the ambient temperature and the harmonic distortion rate.

5. The method of claim 4, wherein, The step of dynamically adjusting the voltage difference threshold value by the ambient temperature and the harmonic distortion rate comprises the steps of: increasing the voltage difference threshold value when the product of the temperature error proportional factor and the temperature error coefficient is greater than a preset temperature threshold value, and / or when the harmonic distortion rate is less than or equal to a preset harmonic distortion rate threshold value; decreasing the voltage difference threshold value when the product of the temperature error proportional factor and the temperature error coefficient is less than or equal to a preset temperature threshold value, and / or when the harmonic distortion rate is greater than a preset harmonic distortion rate threshold value.

6. The method of claim 1, wherein, The preset economic dispatching model satisfies the following relationship: Wherein, a i , b i , c i is the unit fuel cost coefficient, P i is the allocated power.

7. The method of claim 1, wherein, The connection trigger condition is that the voltage difference is less than or equal to the voltage difference threshold value, the frequency difference is less than or equal to the preset frequency threshold value, and the phase difference is less than or equal to the preset phase threshold value; The disconnection trigger condition is that the output power is less than a preset total capacity, and / or the output power is a reverse power.

8. The method of claim 1, wherein, After the step of triggering the connection signal, the method further comprises the step of: controlling the solid-state relay of the generator set to perform a closing action to complete the connection of the generator set.

9. The method of claim 1, wherein, After the step of detecting the output power of the generator set after connection, and triggering a disconnection signal and distributing the output power according to a preset economic dispatching model when the output power meets the disconnection trigger condition, the method further comprises the steps of: decreasing the active power of the prime mover and the reactive power of the excitation system, so that the active power and the reactive power are zeroed; At the current zero point of the generator set, the trigger circuit breaker is tripped, and the generator set is completed.

10. A paralleling and disconnection control device for generator sets, characterized in that, Comprise: The acquisition module is used for real-time acquisition of voltage, frequency and phase instantaneous value of power grid and to-be-parallel-connected unit and environmental temperature, harmonic distortion rate; The calculation module is used for calculating voltage difference, frequency difference and phase difference of power grid and to-be-parallel-connected unit and voltage difference threshold value according to the voltage, the frequency and the phase instantaneous value and the environmental temperature, the harmonic distortion rate; The parallel module is used for adjusting the voltage, frequency and phase of the to-be-parallel-connected unit based on the PID algorithm according to the voltage difference threshold value dynamically adjusted by the environmental temperature and the harmonic distortion rate and the preset frequency difference threshold value, the preset phase difference threshold value, so that the voltage difference, the frequency difference and the phase difference meet the parallel trigger condition, and the parallel signal is triggered; The trip module is used for detecting the output power of the generator set after parallel connection, and triggering the trip signal and dynamically distributing the output power according to the preset economic dispatching model when the output power meets the trip trigger condition.

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