Power system planning method for line loss optimization driving

Abstract

The invention discloses a line loss optimization driven electric power system planning method. The method mainly comprises the following steps: step 1, establishing an electric power system model; 2, calculating the line loss of each element; 3, optimizing the power system model according to the calculation result of the line loss; 4, making a power system plan according to the optimized power system model; step 5, implementing power system planning; step 6, performing power system planning; and monitoring and adjusting the power system plan. The method comprises the following steps: step 1: when a power system model is established, firstly determining elements contained in the model, which generally comprise a generator, a load, a transformer, a power transmission line and the like, and step 2: calculating the line loss generally according to the power system model and the operation state of the power system. And for each element, calculating the electric energy loss of the element in the operation process according to the model and the operation state of the element.

Description

Technical Field

[0001] The present invention relates to the field of power system planning, and in particular to a power system planning method driven by line loss optimization. Background Art

[0002] Line loss is an important consideration in power system planning. Traditional planning methods are usually based on experience and intuitive judgment, lacking scientificity and accuracy, and cannot effectively consider the impact of line loss on planning results. Therefore, a new planning construction method is needed that can more accurately consider the impact of line loss. Summary of the invention

[0003] The purpose of the present invention is to provide a power system planning method driven by line loss optimization to solve the problems in the prior art. To achieve the above purpose, the present invention provides the following technical solutions:

[0004] The power system planning method driven by line loss optimization includes the following steps:

[0005] Step 1: Establish a power system model: Build a power system model based on components such as cable lines and transformers in the power system to accurately reflect the actual situation of the power system.

[0006] Step 2: Calculate the line loss of each component: According to the power system model, calculate the line loss of each component, including the line loss of generators, loads, transformers and transmission lines.

[0007] Step 3: Optimize the power system model: According to the calculation results of line loss, optimize the power system model to reduce line loss and improve the operation efficiency of the power system.

[0008] Step 4: Develop a power system plan: Based on the optimized power system model, develop a power system plan to guide the actual operation of the power system and achieve its optimal operating state.

[0009] Step 5: Implement the power system plan: Implement the formulated power system plan into the actual power system, which may involve some transformation and adjustment of the power system.

[0010] Step 6: Monitor and adjust power system planning: Monitor the operation of the power system and adjust the power system planning according to actual conditions to ensure that the power system is always in the optimal operating state.

[0011] Preferably, in step 2, the line loss calculation method includes but is not limited to a node analysis method and a power flow iteration method.

[0012] Preferably, in step six, monitoring and adjusting the power system planning is a continuous process, the purpose of which is to keep the power system in an optimal operating state at all times.

[0013] Compared with the prior art, the beneficial effect of the present invention is that the power system planning method driven by line loss optimization can more accurately consider the impact of line loss on power system planning, thereby improving the operating efficiency of the power system, reducing energy waste, and having significant economic benefits. At the same time, the planning construction method of the present invention is dynamic and can be adjusted according to the actual operating conditions of the power system to keep the power system always in the optimal operating state. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a process flow chart of the present invention. DETAILED DESCRIPTION

[0015] The following is a detailed description of the specific implementation of the power system planning method driven by line loss optimization:

[0016] Step 1: Establish a power system model:

[0017] 1.1 Determine the topology of the power system, including the connection relationships between components such as generators, loads, transformers and transmission lines.

[0018] 1.2 According to the actual situation of the power system, determine the parameters of each component, such as the capacity of the generator, the power demand of the load, the transformation ratio of the transformer and the resistance of the transmission line.

[0019] Step 2: Calculate the line loss of each component:

[0020] 2.1 Use node analysis method or power flow iteration method to calculate the voltage and phase angle of each node in the power system.

[0021] 2.2 Based on the node voltage and phase angle, calculate the power loss of components such as generators, loads, transformers and transmission lines, that is, line loss.

[0022] Step 3: Optimize the power system model:

[0023] 3.1 Based on the calculation results of line loss, analyze the main causes and influencing factors of line loss.

[0024] 3.2 Optimize the design for components or areas with large line losses. For example, you can adjust the capacity of the generator, optimize the distribution of loads, improve the layout of transmission lines, etc.

[0025] 3.3 Use optimization algorithms, such as genetic algorithms or simulated annealing algorithms, to optimize the power system model to reduce line losses and improve the operating efficiency of the power system.

[0026] Step 4: Develop power system planning:

[0027] 4.1 According to the optimized power system model, formulate a power system planning scheme. The planning scheme should take into account factors such as the capacity of generators, the distribution of loads, the configuration of transformers and the layout of transmission lines.

[0028] 4.2 Evaluate the feasibility and effectiveness of the planning scheme through simulation and analysis. You can use power system simulation software to conduct simulation experiments to evaluate indicators such as line loss, voltage stability and economy of the planning scheme.

[0029] Step 5: Implement power system planning:

[0030] 5.1 According to the formulated power system planning scheme, actual power system transformation and adjustment shall be carried out. This may involve operations such as adding transformers, changing line directions, and adjusting load distribution.

[0031] 5.2 During the implementation process, the feasibility, cost-effectiveness and impact of the project on the operation of the existing power system need to be considered.

[0032] Step 6: Monitor and adjust power system planning:

[0033] 6.1 Deploy monitoring equipment to monitor the operation of the power system in real time. Monitoring equipment may include power load monitors, voltage monitors, and line loss monitors.

[0034] 6.2 Analyze the operating status of the power system based on the monitoring data, including indicators such as line loss, voltage stability and load balance.

[0035] 6.3 Adjust the power system planning based on the analysis results. The power system can always be in the optimal operating state by adjusting the output of generators, optimizing load distribution or improving the operation mode of transmission lines.

[0036] Through the above specific implementation methods, the power system planning method driven by line loss optimization can more accurately consider the impact of line loss on power system planning, improve the operating efficiency of the power system, reduce energy waste, and have significant economic benefits. At the same time, the method is dynamic and can be adjusted according to the actual operation of the power system to keep the power system always in the optimal operating state.

Claims

1. A power system planning method driven by line loss optimization, characterized in that: The following steps are involved: Step 1: Establish a power system model; Step 2: Calculate the line loss of each component; Step 3: Optimize the power system model based on the calculation results of the line loss; Step 4: Formulate a power system plan based on the optimized power system model; Step 5: Implement the power system plan; Step 6: Monitor and adjust the power system plan.

2. The power system planning method driven by line loss optimization according to claim 1, characterized in that: In the step 1, a power system model is established including generators, loads, transformers and transmission lines; In the first step, the establishment of the power system model mainly includes the following steps: Identify model elements: Power system models usually include elements such as generators, loads, transformers, and transmission lines; Describing component characteristics: Each component has its own specific physical and electrical characteristics, and the characteristics are described by mathematical formulas; the characteristics of the generator are described by its rated power, efficiency and other parameters; the characteristics of the load are described by its power demand and load curve; the characteristics of the transformer are described by its rated power, ratio, efficiency and other parameters; the characteristics of the transmission line are described by its length, cross-sectional area, resistance, reactance and other parameters; Establish model formula: According to the characteristics of components, establish mathematical formulas to describe the operating status of the power system; the formula includes the relationship between parameters such as voltage, current, and power; for transmission lines, the relationship between voltage, current, and power is described by the following formula: U=I*Z P=U*I Among them, U is voltage, I is current, Z is impedance, and P is power. The formula is used to describe the operating status of the power system or calculate the line loss of each component.

3. The power system planning method driven by line loss optimization according to claim 1, characterized in that: In the step 2, calculating the line loss of each component includes calculating the line loss of the generator, load, transformer and transmission line; In the power system, the line loss of each component is mainly due to the Joule heat generated when the current passes through the resistor. The following is the calculation formula for the line loss of each component: Generator line loss: The line loss of the generator is mainly caused by the current passing through its internal resistance. Its line loss P can be calculated by the following formula: P = I^2*R, where I is the current of the generator and R is the internal resistance of the generator; Load line loss: The line loss of the load is mainly caused by the current passing through its internal resistance. Its line loss P can be calculated by the following formula: P = I^2*R, where I is the current of the load and R is the internal resistance of the load; Transformer line loss: The line loss of the transformer mainly includes copper loss and iron loss. The copper loss is caused by the current passing through the winding resistance of the transformer. Its line loss P_cu is calculated using the following formula: P_cu=I^2*R, where I is the current of the transformer and R is the winding resistance of the transformer. The iron loss is caused by the hysteresis and eddy current loss generated by the magnetic flux in the iron core. Its line loss P_fe is calculated using the formula: P_fe=k*f^2*B^2*V, where k is the loss coefficient of the core material, f is the grid frequency, B is the magnetic flux density of the core, and V is the volume of the core. Transmission line loss: The line loss of a transmission line is mainly caused by the current passing through the line resistance. The line loss P can be calculated using the following formula: P = I^2*R, where I is the line current and R is the line resistance.

4. The power system planning method driven by line loss optimization according to claim 1, characterized in that: In the step three, the power system model is optimized according to the calculation result of the line loss to reduce the line loss; In the power system planning method driven by line loss optimization, the optimization of the power system model based on the calculation results of line loss mainly includes the following aspects: Optimize the operation status of the generator: reduce the line loss of the generator by adjusting the output power and phase angle of the generator; adjust the output power of the generator: by adjusting the output power of the generator, the current flow in the power system can be controlled, thereby reducing the line loss; the specific method of adjusting the output power of the generator can be through the excitation control of the generator Optimize load distribution: Reduce line losses of transmission lines by adjusting load distribution; Optimize load dispatching: Perform load optimization dispatching according to load demand and power supply capacity of the power system; By reasonably arranging the load operation time and operation mode, the load is evenly distributed in different time periods to avoid load concentration in peak hours, thereby reducing line losses of transmission lines; Optimize the operation status of the transformer: By adjusting the transformer ratio, the transformer line loss can be reduced; Transformer ratio adjustment: The transformer ratio determines the proportional relationship between the input voltage and the output voltage; By adjusting the transformer ratio, the voltage can be increased or decreased, thereby affecting the current and reducing the line loss; Optimize the configuration of transmission lines: By adjusting the configuration of transmission lines, such as adding parallel lines, changing the connection method of lines, etc., the line loss of transmission lines can be reduced; Add parallel lines: In the power system, consider adding parallel lines to share the load and reduce the load rate of transmission lines, thereby reducing line losses; By adding parallel lines, the current load of the transmission line is reduced, the line resistance loss is reduced, and thus the line loss is reduced; Changing the connection mode of the line: According to the actual situation of the power system, the connection mode of the transmission line can be changed; the direction of the line can be adjusted to shorten the line length and reduce the resistance loss; in addition, the topology of the line can be adjusted, such as adding ring network lines, changing the series and parallel relationship of the line, etc., to optimize the operation status of the line and reduce line loss; optimizing line parameters: by optimizing the parameters of the transmission line, such as resistance, reactance, etc., the resistance loss and inductance loss of the line can be reduced, thereby reducing line loss; for example, by changing the conductor material, conductor cross-sectional area, insulation material, etc. of the line, the resistance and inductance of the line can be reduced; using high-voltage transmission technology: using high-voltage transmission technology, such as ultra-high voltage transmission, ultra-high voltage transmission, etc., to reduce the current of the transmission line, reduce the line resistance loss, and thus reduce the line loss; high-voltage transmission technology can reduce the current of the transmission line by increasing the voltage level of the transmission line.

5. The line loss optimization driven power system planning method according to claim 1, characterized in that: In the step 4, a power system plan is formulated based on the optimized power system model.

6. The power system planning method driven by line loss optimization according to claim 1, characterized in that: In the step five, the implementation of the power system planning includes the transformation and adjustment of the power system.

7. The power system planning method driven by line loss optimization according to claim 1, characterized in that: In step 6, monitoring and adjusting the power system planning is a continuous process, the purpose of which is to keep the power system in the optimal operating state at all times. Real-time monitoring: Sensors and monitoring equipment installed at key nodes of the power system collect the operating data of the power system in real time, including voltage, current, frequency, power and other parameters. This data is used to monitor the operating status of the power system and promptly identify and handle problems. Data analysis: By analyzing the collected data, we can understand the operating trends and potential problems of the power system, analyze the load curve, and predict future power demand; Analyze line loss data to identify areas and equipment with large line losses; Model optimization: Based on the results of data analysis, the power system model is optimized to improve the operating efficiency and reliability of the power system; the output power of the generator is adjusted, the distribution of loads is optimized, and the configuration of transmission lines is changed; Dispatching decision: Make dispatching decisions and adjust the operating status of the power system based on the results of model optimization; dispatch the start and stop of generators, adjust the power supply sequence of loads, and switch the operating mode of transmission lines; Review and evaluation: After the implementation of the dispatching decision, the operating effect of the power system needs to be reviewed and evaluated to verify the effectiveness of the dispatching decision; If problems are found, dispatch decisions need to be adjusted in a timely manner to ensure the stable operation of the power system.

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