Grid-connected power allocation technology and device for power generation gas turbine

Abstract

The invention belongs to the technical field of power generation, and discloses a power generation gas turbine grid-connected power allocation technology and device which comprises a power detection module, a data processing module and a power regulation and control module. And the output power of the gas turbine is detected in real time through the power detection module, so that the real-time performance of power allocation is ensured. The power detection has the advantages of single current detection, simplicity, linearity and high efficiency. And accuracy: through the data processing module and a preset algorithm, a power regulation and control instruction can be accurately calculated, and accurate allocation of the grid-connected power of the gas turbine is realized. The power allocation effect is that any proportion can be adopted for adjustment, and the power error is reduced; and stability: the output power of the gas turbine is regulated and controlled through the power regulation and control module, so that the stability of the power grid can be effectively improved. According to the power allocation effect, the problem that power oscillates between the two gas turbines does not occur.

Description

Technical Field

[0001] The present invention belongs to the technical field of power generation, and in particular relates to a power generation gas turbine grid-connected power allocation technology and device. Background Art

[0002] With the optimization of energy structure and the rapid development of clean energy, gas turbines have been widely used as an efficient and clean way of power generation. However, in the process of gas turbine grid-connected power generation, how to achieve accurate power allocation between multiple prime movers of different power levels and structural forms to ensure the stability and economy of the power grid has always been an urgent problem to be solved in the industry.

[0003] Technical problems of existing technologies:

[0004] 1) Power detection is not accurate enough:

[0005] In the traditional power generation gas turbine grid-connected power allocation system, the power detection module usually only performs simple current and voltage detection, lacks accurate detection and correction of the output power of each gas turbine, resulting in insufficient accuracy of overall power allocation. In addition, the existing system cannot effectively distinguish the different characteristics of single-shaft and multi-shaft gas turbines, affecting the rationality and accuracy of power allocation.

[0006] 2) Data processing and control algorithms are not optimized:

[0007] When processing power detection data, the algorithms used in existing technologies are often relatively simple and basic, and cannot fully consider the various operating states of power generation gas turbines and changes in the external environment. The data processing module lacks comprehensive consideration of multiple loss coefficients, resulting in certain errors in the generated power control instructions in actual applications, making it difficult to achieve precise control.

[0008] 3) Power control response lag:

[0009] After receiving and processing data, the control instructions generated by the traditional system have a response lag problem and cannot adapt to the rapid changes in the gas turbine's needs in a timely manner. Especially when facing gas turbines with different shaft structures, the control system cannot be flexibly adjusted, resulting in unsatisfactory power distribution and control effects, reducing the system's operating efficiency and stability.

[0010] 4) Poor coordination between fuel and excitation systems:

[0011] Existing technologies often lack coordination in the regulation of fuel and excitation systems, and cannot be adjusted synchronously according to actual power requirements. This not only affects the overall efficiency of power generation gas turbines, but also causes some units to overload or run at no load, increasing the energy consumption and maintenance costs of the system. Summary of the invention

[0012] In view of the problems existing in the prior art, the present invention provides a power generation gas turbine grid-connected power allocation technology and device.

[0013] The present invention is implemented as follows: a power generation gas turbine grid-connected power allocation technology and device includes:

[0014] A power detection module, connected to the data processing module, is used to detect the real-time output power of two or more gas turbines running in grid connection in real time;

[0015] The data processing module is connected to the power control module and is used to receive the detection data of the power detection module, the generator set and the power grid, and process the data according to a preset algorithm to generate a power control instruction;

[0016] The power control module is connected to the data processing module and is used to receive the fuel control instructions and excitation control instructions generated by the data processing module to control the output power of the gas turbine.

[0017] Further, the power detection module:

[0018] The power detection module is used to detect the real-time output power of two or more gas turbines connected to the grid in real time;

[0019] Ne1=U1I1(1)

[0020] Ne2=U2I2(2)

[0021] In equations (1) and (2), Ne is the power provided by the power generation gas turbine unit to the bus; U is the bus DC voltage, I is the DC current input to the bus by each generator unit, and the subscripts 1 and 2 represent two power generation gas turbines; 1 is a single-shaft gas turbine, and 2 is a split-shaft or multi-shaft gas turbine.

[0022] Furthermore, the data processing module:

[0023] The data processing module is used to receive the detection data of the power detection module, the generator set and the power grid, and process them according to the preset algorithm to generate power control instructions;

[0024] For each gas turbine Ne a The actual output power needs to be corrected, and the precise control model used is:

[0025]

[0026] In formula (3) and formula (4), is the loss coefficient of the generator, ψ is the loss coefficient of the excitation device, is the loss coefficient of the rectifier; subscripts 1 and 2 represent two power generation gas turbines; 1 is a single-shaft gas turbine, and 2 is a split-shaft or multi-shaft gas turbine.

[0027] In view of the DC voltage U1≈U2=U, in this device, only the current value of each power generation gas turbine unit input to the bus can be checked, and the current measurement value must have a higher acquisition frequency; judgment conditions:

[0028]

[0029] In formula (5), p is the ratio of the rated power of the grid-connected gas turbines or the set distribution ratio, which can be set according to the work requirements or determined according to the power ratio of the two gas turbine generator sets. δ is the error, which is generally not more than 3%;

[0030] When equation (5) is not satisfied, the power distribution is precisely controlled by adjusting the excitation current; at the same time, the gas turbine fuel system adjusts the fuel flow rate through the inner loop PID to match the AC frequency before the generator set is input to the rectifier cabinet, as shown in equation (6);

[0031]

[0032] In formula (6), n is the actual speed of the output shaft of the power generation gas turbine, n0 is the design rated speed of the output shaft of the power generation gas turbine, and ε is the error, which is generally not greater than 0.5%;

[0033] For a single-shaft gas turbine, the speed is constant and the power N e a,1 and gas turbine turbine inlet temperature T3, fuel flow rate G f,1 There is an external characteristic relationship:

[0034] Ne a,1 =f1(T3,G f,1 ) (7)

[0035] For split-shaft or multi-shaft gas turbines, the power turbine speed remains constant, but the gas generator speed varies, and the power Ne a,2 and compressor air flow G c 、Fuel flow G f,2 There is an external characteristic relationship:

[0036] Ne a,2 =f2(G c ,G f,2 ) (8).

[0037] Furthermore, the power control module:

[0038] The power control module is used to receive the fuel control instructions and excitation control instructions generated by the data processing module to control the output power of the gas turbine;

[0039] By inverting equations (7) and (8), we can obtain:

[0040]

[0041] Assume that the fuel flow rate of the single-shaft gas turbine at rated power is G f,01 The fuel flow rate at rated power of split-shaft or multi-shaft gas turbine is G f,02 ;

[0042] The power balance factor α and the time balance factor β of the coupling response rate are used to form a comprehensive control instruction;

[0043] For a single-shaft gas turbine, the excitation control command c1 is:

[0044]

[0045] For split-shaft or multi-shaft gas turbines, the excitation system control instruction c2 is:

[0046]

[0047] For a single-shaft gas turbine, since about one-third of its turbine power regulation is power generation, the power balancing factor α can be a value between 2.5 and 3.5; for a split-shaft or multi-shaft gas turbine, since all of its power turbine power regulation is power generation, the power balancing factor α can be a value between 0.9 and 1.1;

[0048] The time balancing factor β is calculated based on the time t of each gas turbine from slow to full operating conditions and the average time of all gas turbines. The positive correlation is set, that is

[0049] Another object of the present invention is to provide a power generation gas turbine grid-connected power allocation technology method comprising:

[0050] Step 1, using a power detection module to detect the real-time output power of two or more gas turbines connected to the grid in real time;

[0051] Step 2, receiving the detection data of the power detection module and the generator set and the power grid through the data processing module, and processing them according to a preset algorithm to generate a power control instruction;

[0052] Step 3: The power control module receives the fuel control instruction and the excitation control instruction generated by the data processing module to control the output power of the gas turbine.

[0053] Another object of the present invention is to provide a computer device, which includes a memory and a processor, wherein the memory stores a computer program, and when the computer program is executed by the processor, the processor executes the steps of the power allocation method for the grid-connected power generation gas turbine.

[0054] Another object of the present invention is to provide a computer-readable storage medium storing a computer program, which, when executed by a processor, enables the processor to execute the steps of the method for power generation gas turbine grid-connected power allocation.

[0055] Another object of the present invention is to provide an information data processing terminal, which is used to implement the power distribution device for the power generation gas turbine grid-connected.

[0056] In combination with the above technical solutions and the technical problems solved, the advantages and positive effects of the technical solutions to be protected by the present invention are as follows:

[0057] First, in view of the technical problems existing in the above-mentioned prior art, some creative technical effects are brought about after solving the problems. The specific description is as follows:

[0058] (1) Real-time performance: The power detection module detects the output power of the gas turbine in real time, ensuring the real-time performance of power allocation. Power detection effect: Single current detection, simple, linear and efficient.

[0059] (2) Accuracy: Through the data processing module and the preset algorithm, the power control instructions can be accurately calculated, realizing the precise allocation of the gas turbine grid-connected power.

[0060] Power allocation effect: Any proportional adjustment can be adopted, and the power error meets the set requirements.

[0061] (3) Stability: The output power of the gas turbine can be regulated by the power control module, which can effectively improve the stability of the power grid.

[0062] Power allocation effect: There is no problem of power oscillation between the two gas turbines.

[0063] (4) Economic efficiency: By accurately adjusting the grid-connected power of gas turbines, the operating cost of the power grid can be reduced and economic efficiency can be improved.

[0064] Power allocation effect: It can enable the gas turbine to operate under its own economic conditions, and avoid problems such as surge, overheating, and overspeed during transient processes.

[0065] Second, the significant technical progress achieved by the present invention:

[0066] 1) Accurate power detection and differentiation:

[0067] The present invention realizes accurate detection of the real-time output power of multiple gas turbines connected to the grid by improving the power detection module, and can distinguish the different characteristics of single-shaft and multi-shaft gas turbines. The output power of each gas turbine is accurately calculated by formulas (1) and (2), providing accurate basic data for subsequent data processing and regulation.

[0068] 2) Optimized data processing algorithm:

[0069] The data processing module of the present invention adopts a precise control model based on a preset algorithm, taking into account the loss coefficients of the generator, excitation device and rectifier device (Formulas (3) and (4)). The DC current value is collected at high frequency, and the fuel flow rate is adjusted by using the PID inner loop to ensure the accuracy and timeliness of power distribution (Formulas (5) and (6)).

[0070] 3) Efficient power regulation response:

[0071] The power control module of the present invention combines the power balancing factor and the time balancing factor to generate a comprehensive control instruction (Formulas (9) to (12)). According to the different control requirements of single-shaft and multi-shaft gas turbines, reasonable balancing factor ranges and time balancing factors are set respectively, which significantly improves the response speed and flexibility of power control and ensures the efficient operation of the system.

[0072] 4) Coordinated fuel and excitation system control:

[0073] The present invention achieves a high degree of coordination in the regulation of the fuel and excitation systems. Through real-time adjustment of comprehensive control instructions, the fuel system and the excitation system can synchronously respond to actual power requirements, avoiding the occurrence of overload or no-load operation, and improving the overall efficiency and stability of the system.

[0074] In summary, the present invention solves the problems of insufficient accurate detection, suboptimal algorithm, delayed response and poor system coordination existing in the prior art by comprehensively optimizing power detection, data processing and control algorithms, and significantly improves the performance and reliability of the grid-connected power dispatch system of power generation gas turbines.

[0075] Third, as auxiliary evidence of the inventiveness of the claims of the present invention, it is also reflected in the following important aspects:

[0076] (1) The expected benefits and commercial value of the technical solution of the present invention after transformation are:

[0077] After transformation, the technical solution of the present invention can be applied to the power allocation and energy management of gas turbine grid connection, and according to the characteristics of different units, the overall power generation can be reasonably allocated and optimized, the stability of the actual gas turbine grid connection system can be maximized, and the voltage fluctuation of the grid and the speed fluctuation of the power generation prime mover can be effectively suppressed. In the field of distributed energy systems and isolated power grids, this technology has strong practical value and promotion potential in promoting technological innovation and research and development, improving energy utilization efficiency, enhancing system stability and reliability, promoting the optimization and upgrading of energy structure, and reducing operation and maintenance costs.

[0078] (2) The technical solution of the present invention fills the technical gap in the industry at home and abroad:

[0079] The present invention takes into account the characteristics of different gas turbines and proposes for the first time different forms of gas turbine grid-connected power allocation technology. By adding a power detection module, a data processing module, and a power control module, an experimental platform is built for verification, thereby achieving stable operation of the micro gas turbine grid-connected system under different load fluctuation forms.

[0080] (3) Whether the technical solution of the present invention solves the technical problems that people have been eager to solve but have not been able to solve successfully:

[0081] Effectively solve the problem of insufficient stability of microgrids: The two different forms of gas turbines have different characteristics, and both can respond quickly when the grid load changes. Through power allocation, gas turbines work together with other electrical equipment to achieve balanced and stable operation of the grid and reduce the risk of grid failure caused by load fluctuations.

[0082] The problem of effectively optimizing energy utilization: According to the characteristics of different forms of gas turbines, flexibly adjust the power distribution of gas turbines in different load periods to improve the economy of the system.

[0083] Third, the present invention solves the problems of inaccurate power control, slow response speed and unbalanced power distribution in the prior art by providing a power generation gas turbine grid-connected power allocation device, and has achieved significant technical progress. The details are as follows:

[0084] 1. Accurate power control: Through the synergy of the power detection module and the data processing module, the output power of the gas turbine is detected in real time, and the output power is corrected based on the preset accurate control model, so that the output power of each grid-connected gas turbine is more accurate. Compared with the simple power monitoring in the prior art, the present invention can ensure the high accuracy and high stability of the system based on real-time feedback and error correction mechanism.

[0085] 2. Dynamic adjustment response capability: By adjusting the excitation current and fuel flow, the system can dynamically adjust according to the actual state of the gas turbine in real-time operation to ensure the balance of power distribution and the rapid response capability of the system. This technical improvement can effectively avoid the response delay caused by gas turbine load fluctuations or environmental changes, and significantly improve the flexibility and stability of the system.

[0086] 3. Adaptive power distribution: By introducing power balancing factors and time balancing factors, combined with fuel control and excitation control, the system can automatically adjust power distribution according to different types of gas turbines (single-shaft, multi-shaft) and their operating conditions. Compared with the fixed power distribution scheme of the prior art, the present invention optimizes power distribution through an adaptive adjustment mechanism, effectively reducing the load imbalance problem between different gas turbines.

[0087] 4. Low error rate control: The present invention ensures that the gas turbine can effectively reduce fluctuations when connected to the grid and maintains high accuracy and stability during operation by reasonably setting the error range (such as power error δ not exceeding 3%, speed error ε not exceeding 0.5%), thereby solving the problem of insufficient error control in the prior art.

[0088] 5. Efficient algorithm optimization: The system uses advanced computing models to solve the output power, fuel flow, etc. of the gas turbine in real time, and dynamically adjusts the parameters, thereby improving the computing efficiency and processing capacity of the system. In particular, through the judgment conditions in formula (5), the present invention can ensure that the system can still maintain efficient power distribution under complex grid-connected conditions.

[0089] 6. Broad industrial application prospects: The present invention is not only applicable to the grid-connected operation of traditional gas turbines, but can also be extended to new energy power generation systems. It has significant technical advantages in improving grid stability, saving energy and improving power generation efficiency.

[0090] In summary, the present invention has made significant progress in power allocation accuracy, response speed, adaptive regulation and error control compared with the prior art, can effectively solve practical problems in industrial applications, and has broad application value and promotion prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0091] Figure 1 It is a structural block diagram of a power distribution device for a power generation gas turbine connected to the grid provided by an embodiment of the present invention.

[0092] Figure 2 It is a technical flow chart of grid-connected power allocation of power generation gas turbines provided in an embodiment of the present invention.

[0093] Figure 3 It is a schematic structural diagram of a grid-connected power generation device provided in an embodiment of the present invention.

[0094] Figure 4 It is a schematic diagram of a grid-connected power allocation system provided by an embodiment of the present invention.

[0095] Figure 5 It is a power regulation steady-state diagram provided by an embodiment of the present invention.

[0096] Figure 6 It is a flow chart of a power regulation dynamic graph method provided by an embodiment of the present invention.

[0097] Figure 1 In: 1. Power detection module; 2. Data processing module; 3. Power control module. DETAILED DESCRIPTION

[0098] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0099] The following are two specific industrial application embodiments of the power distribution device for the power generation gas turbine connected to the grid based on the present invention:

[0100] 1. Gas turbine power control system applied to distributed energy grid

[0101] In a distributed energy grid, there are often multiple small power generation units running in parallel, such as gas turbines, solar photovoltaic, wind power and other power generation equipment. These power generation equipment usually have large power fluctuations and response delays. Especially when the load changes greatly, the unbalanced power distribution between the various power generation units may cause grid instability. The gas turbine grid-connected power allocation device of the present invention can monitor the output power of multiple gas turbines in real time in a distributed energy grid, and perform precise regulation through a data processing module and a power regulation module.

[0102] For example, in a distributed power generation system consisting of five gas turbines, the system detects the output power of each gas turbine in real time and determines whether the power distribution meets the set balance ratio based on a real-time algorithm. If a gas turbine outputs insufficient power due to load fluctuations, the system will automatically adjust its fuel flow and excitation current based on the detection results to ensure that the power output of the gas turbine is balanced with other units, thereby ensuring the overall stability of the power grid and the accuracy of power distribution.

[0103] 2. Grid-connected gas turbine power generation system for peak load regulation

[0104] In some peak load regulation scenarios, such as industrial parks or large-scale urban power supply systems, the power grid often faces load peaks, requiring power generation equipment to respond quickly and provide additional power support. The power allocation device of the present invention can play a key role in such peak load regulation application scenarios.

[0105] For example, in the peak load regulation process of a large industrial park, there are usually three gas turbines in grid-connected operation. When the load suddenly increases, the device quickly detects the load change through the power detection module, and calculates the power value that needs to be increased for each gas turbine through the data processing module, and generates control instructions for fuel flow and excitation current. Through the inner loop PID control, it is ensured that the gas turbine can quickly respond to peak load demands and provide the required additional power. During the entire regulation process, the system ensures that the power distribution of each gas turbine remains reasonable by adjusting the power balancing factor in real time, avoiding the problem of overload of a single gas turbine or system imbalance.

[0106] The above two embodiments show that the present invention can significantly improve the efficiency and stability of the grid-connected operation of gas turbines, and has important application value, especially in key scenarios such as distributed power generation and peak load regulation.

[0107] like Figure 1 As shown, a power distribution device for a power generation gas turbine connected to the grid provided by an embodiment of the present invention comprises:

[0108] Power detection module 1, data processing module 2, power control module 3;

[0109] The power detection module 1 is connected to the data processing module 2 and is used to detect the real-time output power of two or more gas turbines running in grid connection in real time;

[0110] The data processing module 2 is connected to the power control module 3 and is used to receive the detection data of the power detection module and the generator set and the power grid, and process the data according to a preset algorithm to generate a power control instruction;

[0111] The power control module 3 is connected to the data processing module 2 and is used to receive the fuel control instructions and excitation control instructions generated by the data processing module to control the output power of the gas turbine.

[0112] The power detection module provided by the embodiment of the present invention:

[0113] The power detection module is used to detect the real-time output power of two or more gas turbines connected to the grid in real time;

[0114] Ne1=U1I1(1)

[0115] Ne2=U2I2(2)

[0116] In equations (1) and (2), Ne is the power provided by the power generation gas turbine unit to the bus; U is the bus DC voltage, I is the DC current input to the bus by each generator unit, and the subscripts 1 and 2 represent two power generation gas turbines; 1 is a single-shaft gas turbine, and 2 is a split-shaft or multi-shaft gas turbine.

[0117] The data processing module provided by the embodiment of the present invention:

[0118] The data processing module is used to receive the detection data of the power detection module, the generator set and the power grid, and process them according to the preset algorithm to generate power control instructions;

[0119] For each gas turbine Ne a The actual output power needs to be corrected, and the precise control model used is:

[0120]

[0121] In formula (3) and formula (4), is the loss coefficient of the generator, ψ is the loss coefficient of the excitation device, is the loss coefficient of the rectifier;

[0122] In view of the DC voltage U1≈U2=U, in this device, only the current value of each power generation gas turbine unit input to the bus can be checked, and the current measurement value must have a higher acquisition frequency; judgment conditions:

[0123]

[0124] In formula (5), p is the ratio of the rated power of the grid-connected gas turbine or the set allocation ratio, δ is the error, which is generally not greater than 3%;

[0125] When equation (5) is not satisfied, the power distribution is precisely controlled by adjusting the excitation current; at the same time, the gas turbine fuel system adjusts the fuel flow rate through the inner loop PID to match the AC frequency before the generator set is input to the rectifier cabinet, as shown in equation (6);

[0126]

[0127] In formula (6), n is the actual speed of the output shaft of the power generation gas turbine, n0 is the design rated speed of the output shaft of the power generation gas turbine, and ε is the error, which is generally not greater than 0.5%;

[0128] For a single-shaft gas turbine, the speed is constant and the power Ne a and gas temperature T3, fuel flow G f,1 There is an external characteristic relationship:

[0129] Nea,1 =f1(T3,G f,1 ) (7)

[0130] For split-shaft or multi-shaft gas turbines, the power turbine speed remains constant, but the gas generator speed varies, and the power Ne a and compressor air flow G c 、Fuel flow G f,2 There is an external characteristic relationship:

[0131] Ne a,2 =f2(G c ,G f,2 ) (8).

[0132] The power control module provided by the embodiment of the present invention:

[0133] The power control module is used to receive the fuel control instructions and excitation control instructions generated by the data processing module to control the output power of the gas turbine;

[0134] By inverting equations (7) and (8), we can obtain:

[0135]

[0136] Assume that the fuel flow rate of the single-shaft gas turbine at rated power is G f,01 The fuel flow rate at rated power of split-shaft or multi-shaft gas turbine is G f,02 ;

[0137] The power balance factor α and the time balance factor β of the coupling response rate are used to form a comprehensive control instruction;

[0138] For a single-shaft gas turbine, the excitation control command c1 is:

[0139]

[0140] For split-shaft or multi-shaft gas turbines, the excitation system control instruction c2 is:

[0141]

[0142] For a single-shaft gas turbine, since about one-third of its turbine power regulation is power generation, the power balancing factor α can be a value between 2.5 and 3.5; for a split-shaft or multi-shaft gas turbine, since all of its power turbine power regulation is power generation, the power balancing factor α can be a value between 0.9 and 1.1;

[0143] The time balancing factor β is calculated based on the time t of each gas turbine from slow to full operating conditions and the average time of all gas turbines. The positive correlation is set, that is

[0144] like Figure 2 As shown, a power generation gas turbine grid-connected power allocation technical method provided by an embodiment of the present invention includes:

[0145] S101, detecting the real-time output power of two or more gas turbines connected to the grid in real time through a power detection module;

[0146] S102, receiving detection data from the power detection module, the generator set and the power grid through the data processing module, and processing the data according to a preset algorithm to generate a power control instruction;

[0147] S103, receiving the fuel control instruction and the excitation control instruction generated by the data processing module through the power control module, and regulating the output power of the gas turbine.

[0148] like Figure 3 As shown, according to the present invention, a different type of power generation gas turbine grid-connected system is built, which includes a single-shaft gas turbine and a split-shaft gas turbine, control systems, excitation control systems, rectifiers, power control panels, load panels, bus-connected panels (including grid-connected controllers and energy management systems), and two user loads. Two different types of gas turbines are connected in parallel through a three-phase uncontrolled rectifier bus-connected panel to achieve load distribution of grid-connected power.

[0149] The voltage, current, frequency, phase and other parameters on the AC side of the rear end of the gas turbine generator and the voltage and current on the DC side of the rear end of the rectifier are fed back to the busbar paralleling screen. The real-time power of the two gas turbines is detected by the power detection module. The relevant data of the generator sets of the other two gas turbines are also transmitted to the energy management system in the busbar screen. The power is allocated according to the established power allocation ratio. If it does not meet the requirements, the energy management system in the busbar screen will issue a control instruction to control the power of the excitation control system and the control system of the gas turbine respectively. The specific control method is as described above, and finally the reasonable distribution of power is achieved. The overall allocation process is as follows: Figure 4 shown.

[0150] Figure 5 and Figure 6The power change of the grid-connected system of two power generation gas turbines in steady state and load mutation (test data), 1# gas turbine is a split-shaft gas turbine with a power of 200kW, 2# gas turbine is a single-shaft gas turbine with a power of 100kW, and the power distribution ratio is set to 2:1. The steady-state user load is set to 90kW. Through experiments, it can be seen that after stabilization, the power of the 1# gas turbine generator set fluctuates in the range of 59.8kW-65.2kW, and the effective power is 62.2kW, and the 2# gas turbine fluctuates in the range of 29.8kW-30.3kW, and the effective power is 30kW, then the power distribution ratio is 2.07, and the error is 3.67%.

[0151] The dynamic process is as follows: at t=0, the power of the 1# gas turbine is stable at 10kW, and the power of the 2# gas turbine is stable at 5kW. At 18s, it suddenly increases by 22.5kW. Due to the differences in the structural forms and control systems of the two gas turbines, the response speed of the 2# gas turbine is much faster than that of the 1# gas turbine. After 20s of stabilization, the power of the 1# gas turbine is basically stable at 25kW, and the power of the 2# gas turbine is stable at 12.5kW, which meets the power distribution ratio of 2:1. However, due to the differences in the control system and structural form, the dynamic regulation process does not necessarily maintain a 2:1 ratio.

[0152] It should be noted that the embodiments of the present invention can be implemented by hardware, software, or a combination of software and hardware. The hardware part can be implemented using dedicated logic; the software part can be stored in a memory and executed by an appropriate instruction execution system, such as a microprocessor or dedicated design hardware. It can be understood by a person of ordinary skill in the art that the above-mentioned devices and methods can be implemented using computer executable instructions and / or contained in a processor control code, such as a carrier medium such as a disk, CD or DVD-ROM, a programmable memory such as a read-only memory (firmware), or a data carrier such as an optical or electronic signal carrier. Such code is provided on the carrier medium. The device and its modules of the present invention can be implemented by hardware circuits such as very large-scale integrated circuits or gate arrays, semiconductors such as logic chips, transistors, etc., or programmable hardware devices such as field programmable gate arrays, programmable logic devices, etc., can also be implemented by software executed by various types of processors, and can also be implemented by a combination of the above-mentioned hardware circuits and software, such as firmware.

[0153] The above description is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any modifications, equivalent substitutions and improvements made by any technician familiar with the technical field within the technical scope disclosed by the present invention and within the spirit and principle of the present invention should be covered by the protection scope of the present invention.

Claims

1. A power distribution device for a power generation gas turbine connected to the grid, characterized in that: include: A power detection module, connected to the data processing module, is used to detect the real-time output power of two or more gas turbines running in grid connection in real time; The data processing module is connected to the power control module and is used to receive the detection data of the power detection module, the generator set and the power grid, and process the data according to a preset algorithm to generate a power control instruction; The power control module is connected to the data processing module and is used to receive the fuel control instructions and excitation control instructions generated by the data processing module to control the output power of the gas turbine.

2. The power distribution device for grid-connected gas turbine according to claim 1, characterized in that: The power detection module: The power detection module is used to detect the real-time output power of two or more gas turbines connected to the grid in real time; Ne1=U1U1(1) Ue2=U2I2(2) In equations (1) and (2), Ne is the power provided by the power generation gas turbine unit to the bus; U is the bus DC voltage, I is the DC current input to the bus by each generator unit, and the subscripts 1 and 2 represent two power generation gas turbines; 1 is a single-shaft gas turbine, and 2 is a split-shaft or multi-shaft gas turbine.

3. The power distribution device for grid-connected gas turbine according to claim 1, characterized in that: The data processing module: The data processing module is used to receive the detection data of the power detection module, the generator set and the power grid, and process them according to the preset algorithm to generate power control instructions; For each gas turbine Ne a The actual output power needs to be corrected, and the precise control model used is: In formula (3) and formula (4), is the loss coefficient of the generator, ψ is the loss coefficient of the excitation device, is the loss coefficient of the rectifier; In view of the DC voltage U1≈U2=U, in this device, only the current value of each power generation gas turbine unit input to the bus can be checked, and the current measurement value must have a higher acquisition frequency; judgment conditions: In formula (5), p is the ratio of the rated power of the grid-connected gas turbines or the set allocation ratio, which is set according to the working demand or determined according to the power ratio of the two gas turbine generator sets. δ is the error, which is generally not more than 3%; When equation (5) is not satisfied, the power distribution is precisely controlled by adjusting the excitation current; at the same time, the gas turbine fuel system adjusts the fuel flow rate through the inner loop PID to match the AC frequency before the generator set is input to the rectifier cabinet, as shown in equation (6); In formula (6), n is the actual speed of the output shaft of the power generation gas turbine, n0 is the design rated speed of the output shaft of the power generation gas turbine, and ε is the error, which is generally not greater than 0.5%; For a single-shaft gas turbine, the speed is constant and the power Ne a,1 and gas turbine turbine inlet temperature T3, fuel flow rate G f,1 There is an external characteristic relationship: No a,1 =f1(T3,G f,1 ) (7) For split-shaft or multi-shaft gas turbines, the power turbine speed remains constant, but the gas generator speed varies, and the power Ne a,2 and compressor air flow G c 、Fuel flow G f,2 There is an external characteristic relationship: No a,2 =f2(G c ,G f,2 ) (8)。 4. The power distribution device for grid-connected gas turbine according to claim 1, characterized in that: The power control module: The power control module is used to receive the fuel control instructions and excitation control instructions generated by the data processing module to control the output power of the gas turbine; By inverting equations (7) and (8), we can obtain: Assume that the fuel flow rate of the single-shaft gas turbine at rated power is G f,01 The fuel flow rate at rated power of split-shaft or multi-shaft gas turbine is G f,02 ; The power balance factor α and the time balance factor β of the coupling response rate are used to form a comprehensive control instruction; For a single-shaft gas turbine, the excitation control command c1 is: For split-shaft or multi-shaft gas turbines, the excitation system control instruction c2 is: For a single-shaft gas turbine, since about one-third of its turbine power regulation is power generation, the power balancing factor α can be a value between 2.5 and 3.5; for a split-shaft or multi-shaft gas turbine, since all of its power turbine power regulation is power generation, the power balancing factor α can be a value between 0.9 and 1.1; The time balancing factor β is calculated based on the time t of each gas turbine from slow to full operating conditions and the average time of all gas turbines. The positive correlation is set, that is 5. A power generation gas turbine grid-connected power allocation device for implementing the power generation gas turbine grid-connected power allocation method according to any one of claims 1 to 4, characterized in that: The power generation gas turbine grid-connected power allocation device comprises: Step 1, using a power detection module to detect the real-time output power of two or more gas turbines connected to the grid in real time; Step 2: receiving the detection data of the power detection module, the generator set and the power grid through the data processing module, and processing them according to a preset algorithm to generate a power control instruction; Step 3: The power control module receives the fuel control instruction and the excitation control instruction generated by the data processing module to control the output power of the gas turbine.

6. A computer device, characterized in that: The computer device includes a memory and a processor, wherein the memory stores a computer program, and when the computer program is executed by the processor, the processor executes the steps of the method for grid-connected power allocation of a power generation gas turbine as claimed in any one of claims 1 to 4.

7. A computer-readable storage medium storing a computer program, wherein when the computer program is executed by a processor, the processor executes the steps of the method for grid-connected power allocation of a power generation gas turbine as claimed in any one of claims 1 to 4.

8. An information data processing terminal, characterized in that: The information data processing terminal is used to implement the power generation gas turbine grid-connected power allocation device as described in claim 5.

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