Novel voltage drop design method for integrated distribution network

Abstract

The application discloses a novel voltage drop design method for a comprehensive power distribution network, characterized in that the total voltage drop from a voltage source to an arbitrary device terminal point in the system is within 6%, and the method comprises the following steps: step 1, the voltage drop allowance of a main incoming line cable is 1.5%; step 2, the voltage drop allowance from a module high-voltage main distribution board (2) to a transformer or a high-voltage device terminal is 4.5%; and step 3, the voltage drop allowance from a module transformer (3) to a module load (4) or a lower-level transformer is 6%. The novel voltage drop design method for the comprehensive power distribution network can effectively control the voltage drop of each power supply circuit to the entire power supply circuit in a systematic and step-by-step and section-by-section manner, and can control the selection cost of cables and distribution switches, has strong design practicability and operability, has strong precise line control, and can enhance the design accuracy and economic practicability of the system.

Description

Technical Field

[0001] This invention relates to a novel voltage drop design method for integrated power distribution networks. Background Technology

[0002] In large-scale integrated power distribution network systems, the design of power generation, transmission, distribution, and usage schemes requires the calculation of steady-state voltage drop in the power grid to ensure that the power supply voltage of electrical equipment meets the equipment's operating requirements. This involves verifying whether the selected design meets the voltage drop requirements. Therefore, the calculation of line voltage drop is a necessary step in ensuring that the circuit design and cable selection meet the requirements. Major classification societies have clearly defined allowable ranges for voltage drop. In addition to meeting the requirements of the specifications, it is necessary to conduct further detailed research and innovation on design methods to make the design more accurate, more economical, and more rational. Summary of the Invention

[0003] The purpose of this invention is to provide a novel voltage drop design method for integrated power distribution networks.

[0004] The technical solution adopted by this invention to achieve the above objectives is: a novel voltage drop design method for integrated power distribution networks, wherein the total voltage drop from the voltage source to any device terminal in the system is allowed to be within 6%, comprising the following steps:

[0005] Step 1, the allowable voltage drop of the main incoming cable is 1.5%, that is, the allowable voltage drop from the module main generator (1) to the module high voltage main distribution board (2) is within 1.5%;

[0006] Step 2, the allowable voltage drop from the module high-voltage main distribution board (2) to the transformer is 4.5%, and the allowable voltage drop from the module high-voltage main distribution board (2) to the high-voltage equipment end is 4.5%;

[0007] Step 3: The allowable voltage drop from the module transformer (3) to the first module distribution board (5) is within 1.5%, and the allowable voltage drop from the first module distribution board (5) to the module load (4) is 4.5%. The allowable voltage drops for each segment are 1.5% and 4.5%, respectively, and the total voltage drop is controlled to be within 6%.

[0008] Step 4: The allowable voltage drop from the module transformer (3) to the first module distribution board (5) is within 1.5%, the allowable voltage drop from the first module distribution board (5) to the module distribution box (6) is within 2%, and the allowable voltage drop from the module distribution box (6) to the module load (4) is within 2.5%. The allowable voltage drops for each segment are controlled to be 1.5%, 2%, and 2.5%, respectively, and the total voltage drop is controlled to be within 6%.

[0009] Step 5: The allowable voltage drop from the module transformer (3) to the first module distribution board (5) is within 1.5%, the allowable voltage drop from the first module distribution board (5) to the second module distribution board (7) is 1.5%, and the allowable voltage drop from the second module distribution board (7) to the module transformer (3) is within 3%. The allowable voltage drops for each segment are controlled to be 1.5%, 1.5%, and 3%, respectively, and the total voltage drop is controlled to be within 6%.

[0010] Step 6: The allowable voltage drop from the module transformer (3) to the third module distribution board (8) is 0.5%, the allowable voltage drop from the third module distribution board (8) to the remote module distribution box (9) is 3% adjustable, and the allowable voltage drop from the remote module distribution box (9) to the module load (4) is 2% adjustable. The allowable voltage drops of the segments are controlled to be 0.5%, 3%, and 2% respectively, and the total voltage drop is controlled to be within 6%.

[0011] Step 7: The allowable voltage drop from the module transformer (3) to the third module distribution board (8) is 0.5%, the allowable voltage drop from the third module distribution board (8) to the near-end module distribution box (10) is 0.5%, the allowable voltage drop from the near-end module distribution box (10) to the module junction box (11) is 3% adjustable, and the allowable voltage drop from the module junction box (11) to the module load (4) is 2% adjustable. The allowable voltage drops of the segments are controlled to be 0.5%, 0.5%, 3%, and 2% respectively, and the total voltage drop is controlled to be within 6%.

[0012] Step 8: The allowable voltage drop from the module transformer (3) to the third module distribution board (8) is 0.5%, and the allowable voltage drop from the third module distribution board (8) to the module load (4) is 5.5%. The allowable voltage drops of the control segments are 0.5% and 5.5% respectively, and the total voltage drop is controlled to be within 6%.

[0013] In step 2, the allowable voltage drop from the module high voltage main distribution board (2) to the transformer is 4.5%, that is, the allowable voltage drop from the module high voltage main distribution board (2) to the module transformer (3) is 4.5%, and the allowable voltage drop from the module high voltage main distribution board (2) to the hull transformer (14) is 4.5%.

[0014] In step 2, the allowable voltage drop from the module high-voltage main distribution board (2) to the high-voltage equipment end is 4.5%, that is, the allowable voltage drop from the module high-voltage main distribution board (2) to the module load (4) is within 4.5%.

[0015] Another technical solution adopted by the present invention to achieve the above objectives is: a novel voltage drop design method for integrated power distribution networks, wherein the total voltage drop from the voltage source to any equipment terminal in the system is allowed to be within 6%, comprising the following steps:

[0016] Step 1, the allowable voltage drop of the main incoming cable is 0.5%, that is, the allowable voltage drop from the main generator (12) to the main switchboard (13) is within 0.5%, and the allowable voltage drop from the transformer (14) to the main switchboard (13) is within 0.5%.

[0017] Step 2: The allowable voltage drop from the main power distribution board (13) to the junction box (15) is within 1.5%, the allowable voltage drop from the junction box (15) to the load (17) is within 4%, the voltage drop on the power supply side is 0.5%, the allowable voltage drops of the power supply segments are 1.5% and 4% respectively, and the total control voltage drop is within 6%.

[0018] Step 3: The allowable voltage drop from the main power distribution board (13) to the starter (16) is within 1.5%, the allowable voltage drop from the starter (16) to the load (17) is within 4%, the voltage drop on the power supply side is 0.5%, the allowable voltage drops of the power supply segments are 1.5% and 4% respectively, and the total control voltage drop is within 6%.

[0019] Step 4, the allowable voltage drop from the main power distribution board (13) to the load (17) is within 5.5%;

[0020] Step 5: The allowable voltage drop from the main power distribution board (13) to the power distribution box (18) is within 0.5%, and the allowable voltage drop from the power distribution box (18) to the load (17) is within 5%. The allowable voltage drops for the power supply segments are 0.5% and 5%, respectively, and the total voltage drop is controlled to be within 5.5%.

[0021] Step 6: The allowable voltage drop from the main power distribution board (13) to the sub-distribution box (18) is within 0.5%, the allowable voltage drop from the sub-distribution box (18) to the junction box (15) is within 2.5%, the allowable voltage drop from the junction box (15) to the load (17) is within 2.5%, the allowable voltage drop of the power supply segments is 0.5%, 2.5%, and 2.5%, respectively, and the total control voltage drop is within 5.5%.

[0022] This invention presents a novel voltage drop design method for integrated power distribution networks. While meeting the voltage drop standards required by regulations, it differs from conventional voltage drop calculation methods by systematically grading voltage drop requirements and then considering the overall picture. Within each grade, the voltage drop magnitude of each segment is assessed based on the actual power output of the grid equipment, and the required voltage drop range for each segment is adjusted. This voltage drop method demonstrates significant advantages in large-scale integrated power distribution networks. It offers strong operability at each stage. Typically, the voltage drop between the generator and the distribution board at the power source is very small. However, more often than not, during power transmission and distribution, the cables from intermediate distribution panels and junction boxes to the terminal equipment are excessively long, and there are also many cables from the junction boxes to the terminal equipment. In such cases, the allowable voltage drop value at the front end can be reduced, leaving more allowable voltage drop range for downstream equipment. This effectively controls the cost of selecting cable specifications for terminal equipment, saving on cable selection and the selection of upstream distribution box switches, all of which have significant design implications. It also features highly precise line control, enhancing the accuracy and economic practicality of system design. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of an embodiment of a novel voltage drop design method for integrated power distribution networks according to the present invention.

[0024] Figure 2 This is a schematic diagram of the structure of Embodiment 2 of the novel voltage drop design method for integrated power distribution networks of the present invention.

[0025] In the diagram: 1. Module main generator; 2. Module high-voltage main distribution board; 3. Module transformer; 4. Module load; 5. First module distribution board; 6. Module distribution box; 7. Second module distribution board; 8. Third module distribution board; 9. Remote module distribution box; 10. Near-end module distribution box; 11. Module junction box;

[0026] 12. Main generator; 13. Main switchboard; 14. Transformer; 15. Junction box; 16. Starter; 17. Load; 18. Distribution box. Detailed Implementation

[0027] According to the specifications, the allowable voltage drop range from the distribution board busbar to any terminal equipment installation point in the integrated power distribution network is specified. The voltage drop of the power system is controlled within 6% of the nominal voltage. For battery-powered circuits, the voltage drop can be increased to within 10% of the nominal voltage. The entire power distribution network is designed in accordance with these requirements, resulting in high system reliability. However, at the same time, some design margins are too large, leading to serious waste of design costs. This invention presents a novel voltage drop design method for integrated power distribution networks. Based on the specifications, it systematically divides the network into stages and segments according to the specific configuration, defining the allowable range values ​​for each stage. While ensuring that the total circuit voltage drop range meets the specifications, the allowable range values ​​for each sub-segment voltage drop are flexibly adjusted according to the functions of each stage, including load size and equipment distance, achieving precise design for each stage and item.

[0028] Example 1, as Figure 1As shown, a novel voltage drop design method for integrated power distribution networks allows a total voltage drop from the voltage source to any equipment terminal in the system to be within 6%, including the following steps: Step 1, the allowable voltage drop of the main incoming cable is 1.5%, i.e., the voltage drop from the module main generator 1 to the module high-voltage main distribution board 2 is within 1.5%; Step 2, the allowable voltage drop from the module high-voltage main distribution board 2 to the transformer is 4.5%, i.e., the voltage drop from the module high-voltage main distribution board 2 to the module transformer 3 is 4.5%, the voltage drop from the module high-voltage main distribution board 2 to the hull transformer 14 is 4.5%, and the voltage drop from the module high-voltage main distribution board 2 to the high-voltage equipment terminal is 4.5%, i.e., the voltage drop from the module high-voltage main distribution board 2 to the module load 4 is within 4.5%. The above methods are based on the module... There is a certain distance between the main generator 1 and the high-voltage main distribution board 2 of the module. A 1.5% range is allowed. Voltage supplied to the transformer or load terminal can be considered a stage cutoff. Considering the high-voltage load is distributed throughout the entire main deck module, covering a wide range, the remaining 4.5% range is considered (6%). Step 3: The allowable voltage drop from the module transformer 3 to the first module distribution board 5 is within 1.5%, and the allowable voltage drop from the first module distribution board 5 to the module load 4 is 4.5%. The allowable voltage drops for each segment are 1.5% and 4.5%, respectively, controlling the total voltage drop to within 6%. Step 4: The allowable voltage drop from the module transformer 3 to the first module distribution board 5 is within 1.5%, and the allowable voltage drop from the first module distribution board 5 to the module distribution box 6 is within 2%. Step 6: The allowable voltage drop from module transformer 3 to module load 4 is within 2.5%, and the allowable voltage drops for each segment are 1.5%, 2%, and 2.5%, respectively, with the total voltage drop controlled to within 6%. Step 5: The allowable voltage drop from module transformer 3 to the first module distribution board 5 is within 1.5%, from the first module distribution board 5 to the second module distribution board 7 is within 1.5%, and from the second module distribution board 7 to module transformer 3 is within 3%, with the allowable voltage drops for each segment being 1.5%, 1.5%, and 3%, respectively, with the total voltage drop controlled to within 6%. Step 6: The allowable voltage drop from module transformer 3 to the third module distribution board 8 is 0.5%, and the allowable voltage drop from the third module distribution board 8 to the remote module distribution box 9 is adjustable at 3%. The voltage drop from the remote module distribution box 9 to the module load 4 is... The voltage drop allowable value for load 4 is adjustable at 2%, with the allowable voltage drop values ​​for each segment being 0.5%, 3%, and 2%, respectively, and the total voltage drop controlled within 6%. Step 7: The allowable voltage drop from module transformer 3 to the third module distribution board 8 is 0.5%, from the third module distribution board 8 to the near-end module distribution box 10 is 0.5%, from the near-end module distribution box 10 to the module junction box 11 is adjustable at 3%, and from the module junction box 11 to module load 4 is adjustable at 2%, with the allowable voltage drop values ​​for each segment being 0.5%, 0.5%, 3%, and 2%, respectively, and the total voltage drop controlled within 6%. Step 8: The allowable voltage drop from module transformer 3 to the third module distribution board 8 is 0.5%, and the allowable voltage drop from the third module distribution board 8 to module load 4 is 5%.The allowable voltage drop for each segment is 0.5% and 5.5%, respectively, with the total voltage drop controlled to within 6%.

[0029] Example 2, as Figure 2 As shown, a novel voltage drop design method for integrated power distribution networks, with a total voltage drop from the voltage source to any equipment terminal point in the system allowed to be within 6%, includes the following steps: Step 1, the allowable voltage drop of the main incoming cable is 0.5%, that is, the allowable voltage drop from the main generator 12 to the main distribution board 13 is within 0.5%, and the allowable voltage drop from the transformer 14 to the main distribution board 13 is within 0.5%. Since the main generator 12 and the main distribution board 13 are both located in the engine room and are relatively close, the voltage drop from the upper part of the module... The high-voltage power supply step-down transformer 14 of the main high-voltage distribution board 2 is also located in the engine room, relatively close to the main hull distribution board 13. The voltage drop on the power supply side can be reduced compared to the power requirements of the upper module, and is set to 0.5%. Step 2: The allowable voltage drop from the main hull distribution board 13 to the junction box 15 is within 1.5%, and the allowable voltage drop from the junction box 15 to the hull load 17 is within 4%. The power supply side voltage drop is 0.5%, and the allowable voltage drops for the power supply segments are 1.5% and 4% respectively, controlling the total voltage drop to within 6%. Step 3: The allowable voltage drop from the main power distribution board 13 to the starter 16 is within 1.5%, and the allowable voltage drop from the starter 16 to the load 17 is within 4%. The voltage drop on the power supply side is 0.5%, and the allowable voltage drops for the power supply sections are 1.5% and 4% respectively, with the total control voltage drop within 6%. Step 4: The allowable voltage drop from the main power distribution board 13 to the load 17 is within 5.5%. Step 5: The allowable voltage drop from the main power distribution board 13 to the distribution box 18 is within 0.5%, and the voltage drop from the distribution box 18 to the load 17 is within 6%. The allowable voltage drop for load 17 is within 5%, and the allowable voltage drops for each power supply segment are 0.5% and 5%, respectively, with the total voltage drop controlled to be within 5.5%. In step 6, the allowable voltage drop from the main power distribution board 13 to the power distribution box 18 is within 0.5%, the allowable voltage drop from the power distribution box 18 to the junction box 15 is within 2.5%, and the allowable voltage drop from the junction box 15 to the load 17 is within 2.5%. The allowable voltage drops for each power supply segment are 0.5%, 2.5%, and 2.5%, respectively, with the total voltage drop controlled to be within 5.5%.

[0030] This invention presents a novel voltage drop design method for integrated power distribution networks. Based on the integrated power distribution network of a large FPSO (Floating Production Storage and Offloading) unit, it studies and analyzes novel voltage drop methods for the power distribution networks of the top module generators and the main generators on the hull. This method has been practically applied to the design of FPSO power distribution networks, significantly reducing the cost of control design, selection, and procurement of over 5,000 power cables for the hull section alone, as well as the design cost of upstream distribution box switches. In actual ship applications, it greatly reduces design costs in various aspects, such as cable and distribution switch specifications and distribution box dimensions, and demonstrates superior design innovation. This provides a new design concept and solid design basis for future design work in similar projects.

Claims

1. A novel voltage drop design method for integrated power distribution networks, characterized by, The total voltage drop from the voltage source to the terminal point of any device in the system is allowed to be within 6%, including the following steps: Step 1, the main line cable voltage drop is allowed to be within 1.5%, i.e. the voltage drop from the module main generator (1) to the module high-voltage main distribution board (2) is allowed to be within 1.5%; Step 2, the voltage drop from the module high-voltage main distribution board (2) to the transformer is allowed to be within 4.5%, and the voltage drop from the module high-voltage main distribution board (2) to the high-voltage device terminal is allowed to be within 4.5%; Step 3, the voltage drop from the module transformer (3) to the first module distribution board (5) is allowed to be within 1.5%, and the voltage drop from the first module distribution board (5) to the module load (4) is allowed to be within 4.5%, with the segment voltage drop allowed to be within 1.5%, 4.5% respectively, and the total voltage drop controlled within 6%; Step 4, the voltage drop from the module transformer (3) to the first module distribution board (5) is allowed to be within 1.5%, the voltage drop from the first module distribution board (5) to the module distribution box (6) is allowed to be within 2%, and the voltage drop from the module distribution box (6) to the module load (4) is allowed to be within 2.5%, with the segment voltage drop allowed to be within 1.5%, 2%, 2.5% respectively, and the total voltage drop controlled within 6%; Step 5, the voltage drop from the module transformer (3) to the first module distribution board (5) is allowed to be within 1.5%, the voltage drop from the first module distribution board (5) to the second module distribution board (7) is allowed to be within 1.5%, and the voltage drop from the second module distribution board (7) to the module transformer (3) is allowed to be within 3%, with the segment voltage drop allowed to be within 1.5%, 1.5%, 3% respectively, and the total voltage drop controlled within 6%; Step 6, the voltage drop from the module transformer (3) to the third module distribution board (8) is allowed to be within 0.5%, the voltage drop from the third module distribution board (8) to the remote module distribution box (9) is allowed to be within 3% adjustable, and the voltage drop from the remote module distribution box (9) to the module load (4) is allowed to be within 2% adjustable, with the segment voltage drop allowed to be within 0.5%, 3%, 2% respectively, and the total voltage drop controlled within 6%; Step 7, the voltage drop from the module transformer (3) to the third module distribution board (8) is allowed to be within 0.5%, the voltage drop from the third module distribution board (8) to the near-end module distribution box (10) is allowed to be within 0.5%, the voltage drop from the near-end module distribution box (10) to the module terminal box (11) is allowed to be within 3% adjustable, and the voltage drop from the module terminal box (11) to the module load (4) is allowed to be within 2% adjustable, with the segment voltage drop allowed to be within 0.5%, 0.5%, 3%, 2% respectively, and the total voltage drop controlled within 6%; Step 8, the voltage drop from the module transformer (3) to the third module distribution board (8) is allowed to be within 0.5%, and the voltage drop from the third module distribution board (8) to the module load (4) is allowed to be within 5.5%, with the segment voltage drop allowed to be within 0.5%, 5.5% respectively, and the total voltage drop controlled within 6%.

2. The method of claim 1, wherein: In step 2, the voltage drop from the module high-voltage main distribution board (2) to the transformer is allowed to be within 4.5%, i.e. the voltage drop from the module high-voltage main distribution board (2) to the module transformer (3) is allowed to be within 4.5%, and the voltage drop from the module high-voltage main distribution board (2) to the ship transformer (14) is allowed to be within 4.5%.

3. The method of claim 1, wherein: The step 2, from the module high-voltage main distribution board (2) to the high-voltage equipment terminal voltage drop allowed value 4.5%, that is, from the module high-voltage main distribution board (2) to the module load (4) voltage drop allowed value 4.5% within.

4. A novel voltage drop design method for integrated power distribution networks, characterized by, The total voltage drop allowed value from the voltage source to any device in the system is within 6%, including the following steps: Step 1, the main incoming line cable voltage drop allowed value is 0.5%, that is, from the ship main generator (12) to the ship main distribution board (13) voltage drop allowed value is within 0.5%, from the ship transformer (14) to the ship main distribution board (13) voltage drop allowed value is within 0.5%; Step 2, from the ship main distribution board (13) to the junction box (15) voltage drop allowed value is within 1.5%, from the junction box (15) to the ship load (17) voltage drop allowed value is within 4%, the power supply side voltage drop is 0.5%, the power supply section voltage drop allowed value is 1.5%, 4% respectively, the total control voltage drop is within 6%; Step 3, from the ship main distribution board (13) to the starter (16) voltage drop allowed value is within 1.5%, from the starter (16) to the ship load (17) voltage drop allowed value is within 4%, the power supply side voltage drop is 0.5%, the power supply section voltage drop allowed value is 1.5%, 4% respectively, the total control voltage drop is within 6%; Step 4, from the ship main distribution board (13) to the ship load (17) voltage drop allowed value is within 5.5%; Step 5, from the ship main distribution board (13) to the ship distribution box (18) voltage drop allowed value is within 0.5%, from the ship distribution box (18) to the ship load (17) voltage drop allowed value is within 5%, the power supply section voltage drop allowed value is 0.5%, 5% respectively, the total control voltage drop is within 5.5%; Step 6, from the ship main distribution board (13) to the ship distribution box (18) voltage drop allowed value is within 0.5%, from the ship distribution box (18) to the junction box (15) voltage drop allowed value is within 2.5%, from the junction box (15) to the ship load (17) voltage drop allowed value is within 2.5%, the power supply section voltage drop allowed value is 0.5%, 2.5%, 2.5% respectively, the total control voltage drop is within 5.5%.

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