A method for steady-state adjustment of a power supply for a railway terminal

Abstract

The present application relates to the technical field of power system, provide a kind of steady-state adjustment power supply for railway terminal, comprising: obtaining the rated information of each power supply;Obtain the real-time information of each load in railway terminal;Calculate each power supply real-time and historical information;According to the position state of power supply circuit breaker, judge fault trigger condition, in combination with the available power time filtering and updating the rated parameter set of power supply and the set of power supply real-time and historical information, select factor is calculated by updated set, select power supply preferentially.The present application combines the available power time with total power supply cost by calculating selection factor, preferentially selects the power supply with long available power time and low total power supply cost, avoids simply pursuing stability to select high-cost power supply, or simply pursuing low cost to select unstable power supply, realizes the optimal power supply cost.

Description

Technical Field

[0001] This invention relates to the technical field of power systems, and in particular to a method for steady-state regulation of power supply for railway hubs. Background Technology

[0002] As the core node of the railway transportation system, the reliability of power supply to railway hubs is directly related to the continuous and stable operation of key businesses such as passenger transport organization, train dispatching, signal communication, and passenger services. Once power supply is interrupted or fluctuates frequently, it can easily affect the order of passenger transport services and even cause significant economic losses and adverse social impacts.

[0003] Currently, railway hubs generally adopt a multi-source power supply coordination model. The main power sources include regional power grids, diesel generator emergency power supplies, green distributed energy, and batteries. These power sources have significant differences in their power supply characteristics: regional power grids offer low prices and strong power stability, making them the main power source for the daily operation of railway hubs; diesel generators, as traditional backup emergency power sources, have high reliability, but suffer from slow start-up response and limited power supply capacity, and are mostly used as backup support after the main grid is interrupted; green distributed energy is significantly constrained by environmental and time conditions such as sunlight and weather, and although it has the advantage of low power supply cost, its output fluctuates greatly and its power supply stability is insufficient; batteries have a small energy storage capacity and can only provide short-term emergency power supply, suitable for transitional power supply for very short periods of time.

[0004] In real-world scenarios, the intervals between power outages in regional power grids are uncertain and follow no fixed pattern. Simply switching between multiple power sources based on power supply status would significantly increase the frequency of power outages at railway hubs. This would not only reduce the operational stability of electrical equipment and the passenger experience, but also potentially disrupt normal passenger service processes, and in severe cases, affect train safety and cause economic losses. Therefore, existing multi-power supply methods are insufficient in terms of coordinated switching and continuous power supply capabilities, making it difficult to balance economy, stability, and the high reliability requirements of power supply for railway hubs. Summary of the Invention

[0005] To address the aforementioned technical problems, this invention provides a method for steady-state power supply regulation in railway hubs, comprising: S1, obtain the rated information of each power supply, including the rated capacity, power, power supply cost and hot standby switching time of the power supply; S2, obtain real-time information on each load in the railway hub, including the real-time power of the load and the location status of the load circuit breaker; S3 calculates real-time and historical information for each power supply, including the remaining capacity, real-time power, and location status of the power supply circuit breaker. S4 determines the fault triggering conditions based on the position and status of the power supply circuit breaker, filters and updates the set of rated parameters of the power supply and the set of real-time and historical information of the power supply by combining the available power supply time, calculates the selection factor through the updated set, and selects the best power supply.

[0006] Furthermore, in step S1, there are four types of power supply: local power grid, diesel generators or other combustion-based backup power sources, distributed green energy, and battery power. Assume there are [missing information - likely related to railway hubs]. One power supply, then The power supplies are sequentially defined as power supply 1, power supply 2, ..., power supply... ..., power supply ,but A set of rated parameters for each power supply for: Among them, power supply Rated information The expression is: In the formula, Indicates the rated capacity, when the power supply... For the regional power grid, Infinity; when the power supply For backup power to diesel generators or other combustion-based power sources. To convert the stored primary energy into electricity; when the power supply... As a distributed green energy source, To convert energy storage capacity into electricity consumption; when the power supply... For battery power, Convert battery capacity into electricity consumption; Indicates the rated power, when the power supply... When it is a regional power grid, The rated power of the power supply circuit breaker; when the power supply... When used as backup power for diesel generators or other combustion-based power sources, distributed green energy, and battery energy. This is the rated output power; Indicates the cost of power supply; when the power supply... For the regional power grid, In order to be in Time-of-use electricity pricing for industrial users; when the power supply... When used as a backup power source for diesel generators or other combustion-based or green energy sources, The cost of generating electricity to convert energy into electrical energy; when the power supply... For battery power, Maximum value of electricity price for industrial users and on-grid price of green energy and charging / discharging loss factor The product; Indicates power supply The time required to switch from hot standby mode to normal operation mode, when the power supply For regional power grids, battery energy, and green energy, this value represents the dispatch time, typically 1s to 60s, while for diesel generators or other combustion-based backup power sources it is 30s to 300s.

[0007] Furthermore, in step S2, it is assumed that the railway hub contains For each load, then The loads are defined sequentially as load 1, ..., load 2, ..., load... ,…load ,but Real-time information collection of each load for: load Real-time information The expression is: In the formula, Indicates load Real-time power; Indicates load The position and status of the circuit breaker.

[0008] Furthermore, in step S3, A collection of real-time and historical information of each power supply. for: Power supply Real-time and historical information The expression is: In the formula, Indicates power supply The remaining capacity, when the power supply When it is a non-distributed green energy source, When the power supply When it is distributed green energy, ;in, Power supply The available power supply time is calculated using the following formula: if If it is negative, then set for , This is the minimum stabilization time for the emergency power supply. This time constraint is the minimum time required for frequent power switching, with a typical value of 7200s. Indicates power supply Real-time power, when the power supply When it is a non-distributed green energy source, When the power supply When it is distributed green energy, The calculation method is as follows: take the current time H days after the power supply. Total electricity generated per hour ,Right now =W / H / R, unit is kW; typical values ​​for H and R are 30 and 2, respectively.

[0009] Indicates power supply The position status of the power supply circuit breaker is indicated by a value of 1, which represents power supply and a value of 0, which represents standby or non-power supply.

[0010] Furthermore, the specific steps of step S4 are as follows: Set monitoring interval initial value At present ; S41, if the current time The power supply for step S3 Position status of the power supply circuit breaker All values ​​are 0, and at the previous moment, there was only one power supply. Position status of the power supply circuit breaker If the value is 1, proceed to step S42; otherwise, wait for the specified time. Continue to step S41; S42 sets the rated parameters of the power supply. Remove power supply Then, a new set is formed. ; Collection of real-time and historical information on power supply Remove power supply Then, a new set is formed. ; S43, Calculate the new set Power supply in Available power time Remove 2* Power supply, collection Change to a set ,gather Change to a set Let the number of current power supplies be... , ; S44, Calculation Time Collection Selection factors : S45, find the largest selectivity factor Select the corresponding power supply Provide power if If yes, then end; otherwise, wait. , turn the power supply Join, collection Change to a set and set Proceed to steps S43-S45 to recalculate the power supply selection factor.

[0011] The present invention has the following beneficial effects: (1) By monitoring the position and status of the power supply circuit breaker in real time and comparing the current status with the previous time, the present invention can identify the scenario of a complete power outage caused by a single power supply failure, avoid misjudgment or omission, ensure that the backup power supply switching process is started as soon as the fault occurs, minimize the power outage time, and ensure that the core load of the railway hub does not run uninterrupted.

[0012] (2) By setting power supply time screening conditions, the present invention eliminates power supplies with insufficient power supply time and unable to stably support emergency power supply, ensuring that the selected backup power supply can stably supply power after switching, avoiding secondary power supply interruption or frequent switching due to insufficient power supply support capacity, and maintaining the steady state of the power supply system.

[0013] (3) By calculating the selection factor, the present invention combines the available power supply time with the total power supply cost, and prioritizes the selection of power sources with long available power supply time and low total power supply cost, avoiding the selection of high-cost power sources simply for stability, or the selection of unstable power sources simply for low cost, thus achieving the optimal power supply cost.

[0014] (4) This invention collects real-time power and circuit breaker status of various loads in railway hubs in real time, adapts to the characteristics of diverse and important loads in railway hubs, ensures that power supply adjustment fits the actual load demand, and especially ensures priority power supply for important loads. Attached Figure Description

[0015] Figure 1 This is a flowchart of the steady-state adjustable power supply of the present invention. Detailed Implementation

[0016] The technical solution of the present invention will be further described in detail below with reference to specific embodiments. However, these embodiments are not intended to limit the present invention. Any similar structures and similar variations of the present invention should be included in the protection scope of the present invention. The commas in the present invention all indicate the relationship between and. The English letters in the present invention are case-sensitive.

[0017] like Figure 1 As shown, the present invention provides a method for steady-state adjustment of power supply for railway hubs, comprising: S1, obtain the rated information of each power supply, including the rated capacity, power, power supply cost and hot standby switching time of the power supply; There are four types of power sources: local power grid / mains power, diesel generators and other combustion-based backup power sources, distributed green energy, and battery power; the railway hub is equipped with... One power supply, then The power supplies are sequentially defined as power supply 1, power supply 2, ..., power supply... ..., power supply ,but A set of rated parameters for each power supply for: Among them, power supply Rated information The expression is: In the formula, Indicates the rated capacity, when the power supply... This is a regional power grid, where the power supply capacity can be considered unlimited. The value can be infinity; when the power supply... For backup power to diesel generators or other combustion-based power sources. To convert the stored primary energy into electricity; when the power supply... As a distributed green energy source, To convert energy storage capacity into electricity consumption; when the power supply... For battery power, Convert battery capacity into electricity consumption; Indicates the rated power, when the power supply... When it is a regional power grid, The rated power of the power supply circuit breaker; when the power supply... When used as backup power for diesel generators or other combustion-based power sources, distributed green energy, and battery energy. This is the rated output power; Indicates the cost of power supply; when the power supply... For the regional power grid, In order to be in Time-of-use electricity pricing for industrial users; when the power supply... For battery power, Maximum value of electricity price for industrial users and on-grid price of green energy and charging / discharging loss factor The product; when the power supply When used as a backup power source for diesel generators or other combustion-based or green energy sources, The cost of generating electricity from energy sources; Indicates power supply The time required to switch from hot standby to normal operation. Hot standby refers to the state where the power supply equipment has completed all pre-start preparations (such as the diesel generator being preheated, the battery being fully charged, and the distributed green energy equipment being in standby mode), and can quickly start operation upon receiving a switchover command. For regional power grids, battery energy, and green energy, this value represents the dispatch time, typically 1s to 60s, while for diesel generators or other combustion-based backup power sources it is 30s to 300s.

[0018] S2, obtain real-time information on each load in the railway hub, including the real-time power of the load and the location status of the load circuit breaker; There are a total of railway hubs The loads in this application are important loads, including signaling system loads, communication system loads, station lighting loads, air conditioning loads, traction auxiliary loads, etc. The loads are defined sequentially as load 1, ..., load 2, ..., load... ,…load ,but Real-time information collection of each load for: load Real-time information The expression is: In the formula, Indicates load The real-time power is collected in real time by the smart meter on the load side, and the collection frequency is consistent with the subsequent monitoring time interval T (initially 1 second) to ensure real-time tracking of load power changes; Indicates load The circuit breaker's position status, with a value of 1 indicating a load. When the circuit breaker is closed, the load is normally connected to the power supply circuit and is in a state of power consumption; a value of 0 indicates that the load is in a state of power consumption. The circuit breaker is in the open state, the load is not connected to the power supply circuit, and power is cut off (possibly due to load failure, maintenance, or no need for power). S3 calculates real-time and historical information for each power supply, including the remaining capacity, real-time power, and location status of the power supply circuit breaker. A collection of real-time and historical information of each power supply. for: Power supply Real-time and historical information The expression is: In the formula, Indicates power supply The remaining capacity, when the power supply When the energy source is not distributed green energy, i.e., local power grid / mains power, diesel generators and other backup power sources, or battery power, When the power supply When it is distributed green energy, That is, the remaining capacity is the sum of the current remaining capacity of the energy storage device and the power generation of distributed green energy during the available power supply time; in, Power supply The available power supply time is calculated using the following formula: This formula is applicable only if the current total load power is greater than the power supply power. Real-time power generation; if If it is negative, then set for , This is the minimum stabilization time for the emergency power supply, which constrains the minimum time required for frequent power switching. Indicates power supply Real-time power, when the power supply When it is a non-distributed green energy source, When the power supply When it is distributed green energy, The calculation method is as follows: take the current time H days after the power supply. Total electricity generated per hour ,Right now =W / H / R, with units of kW, where typical values ​​for H and R are 30 and 2, respectively.

[0019] Indicates power supply The position status of the power supply circuit breaker is indicated by a value of 1, which represents power supply and a value of 0, which represents standby or non-power supply.

[0020] S4. Determine the fault triggering conditions based on the position status of the power supply circuit breaker, filter and update the rated parameter set of the power supply source and the set of real-time and historical information of the power supply source in combination with the available power supply time, calculate the selection factor through the updated set, and select the best power supply source. The specific steps are as follows: Set monitoring interval initial value At present ; S41, if the current time The power supply for step S3 Position status of the power supply circuit breaker All values ​​are 0, meaning all power sources are not supplying power, resulting in a complete power outage; and at the previous time step (tT), there was only one power source. Position status of the power supply circuit breaker If the value is 1, it means that only one power supply was providing power in the previous moment, and that power supply has failed and stopped operating, causing a complete power outage. In this case, it is determined to be a fault trigger, and the process proceeds to step S42. Otherwise, the waiting time is set. Continue to step S41; S42 sets the rated parameters of the power supply. Remove power supply Then, a new set is formed. ; Collection of real-time and historical information on power supply Remove power supply Then, a new set is formed. ; S43, Calculate the new set Power supply in Available power time Remove 2* Power supply, collection Change to a set ,gather Change to a set Let the number of current power supplies be... , If, after screening (i.e., no qualified backup power source is found), the emergency power supply plan for the railway hub shall be activated immediately (such as activating the backup diesel generator for cold start and disconnecting some non-critical loads) to ensure power supply to critical loads, and at the same time, a fault alarm signal shall be issued.

[0021] S44, Calculation Time Collection Selection factors : S45, find the largest selectivity factor Select the corresponding power supply Provide power if If yes, then end; otherwise, wait. , turn the power supply Join, collection Change to a set and set Proceed to steps S43-S45 to recalculate the power supply selection factor. (Faulty power supply) After being rejoined to the collection, its rated parameters and real-time information need to be recalculated. If the faulty power supply is not repaired, it will not be rejoined to the collection, and steps S43 to S45 will continue until a qualified power supply can provide power for a long time.

[0022] This invention combines available power supply time with total power supply cost by calculating a selection factor, prioritizing power sources with longer available power supply time and lower total power supply cost. This avoids choosing high-cost power sources simply for stability, or choosing unstable power sources simply for low cost, thus achieving optimal power supply cost. By collecting real-time power and circuit breaker status data of various loads in railway hubs, it adapts to the diverse and varying importance of loads in railway hubs, ensuring that power supply adjustments closely match actual load demands, especially prioritizing power supply to critical loads.

[0023] Although preferred embodiments of this application have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this application.

Claims

1. A method for steady-state adjustment of power supply for railway hubs, characterized in that, include: S1, obtain the rated information of each power supply, including the rated capacity, power, power supply cost and hot standby switching time of the power supply; S2, obtain real-time information on each load in the railway hub, including the real-time power of the load and the location status of the load circuit breaker; S3 calculates real-time and historical information for each power supply, including the remaining capacity, real-time power, and location status of the power supply circuit breaker. S4 determines the fault triggering conditions based on the position and status of the power supply circuit breaker, filters and updates the set of rated parameters of the power supply and the set of real-time and historical information of the power supply by combining the available power supply time, calculates the selection factor through the updated set, and selects the best power supply.

2. The method for steady-state adjustment of power supply for railway hubs according to claim 1, characterized in that, In step S1, there are four types of power supply. Assuming the railway hub has... One power supply, then The power supplies are sequentially defined as power supply 1, power supply 2, ..., power supply... ..., power supply ,but A set of rated parameters for each power supply for: Among them, power supply Rated information The expression is: In the formula, Indicates the rated capacity, when the power supply... For the regional power grid, Infinity; when the power supply For backup power to diesel generators or other combustion-based power sources. To convert the stored primary energy into electricity; when the power supply... As a distributed green energy source, To convert energy storage capacity into electricity consumption; when the power supply... For battery power, Convert battery capacity into electricity consumption; Indicates the rated power, when the power supply... When it is a regional power grid, The rated power of the power supply circuit breaker; when the power supply... When used as backup power for diesel generators or other combustion-based power sources, distributed green energy, and battery energy. This is the rated output power; Indicates the cost of power supply; when the power supply... For the regional power grid, In order to be in Time-of-use electricity pricing for industrial users; when the power supply... When used as a backup power source for diesel generators or other combustion-based or green energy sources, The cost of generating electricity to convert energy into electrical energy; when the power supply... For battery power, Maximum value of electricity price for industrial users and on-grid price of green energy and charging / discharging loss factor The product; Indicates power supply The time required to switch from hot standby mode to normal operation mode, when the power supply This value represents the dispatch time for regional power grids, battery energy, and green energy.

3. The method for steady-state adjustment of power supply for railway hubs according to claim 2, characterized in that, In step S2, it is assumed that there are within the railway hub For each load, then The loads are defined sequentially as load 1, ..., load 2, ..., load... ,…load ,but Real-time information collection of each load for: load Real-time information The expression is: In the formula, Indicates load Real-time power; Indicates load The position and status of the circuit breaker.

4. The method for steady-state adjustment of power supply for railway hubs according to claim 3, characterized in that, In step S3, A collection of real-time and historical information of each power supply. for: Power supply Real-time and historical information The expression is: In the formula, Indicates power supply The remaining capacity, when the power supply When it is a non-distributed green energy source, When the power supply When it is distributed green energy, ;in, Power supply The available power supply time is calculated using the following formula: if If it is negative, then set for , This is the minimum stabilization time for the emergency power supply, which constrains the minimum time required for frequent power switching. Indicates power supply Real-time power, when the power supply When it is a non-distributed green energy source, When the power supply When it is distributed green energy, The calculation method is as follows: take the current time H days after the power supply. Total electricity generated per hour ,Right now =W / H / R, unit is kW; Indicates power supply The position status of the power supply circuit breaker is indicated by a value of 1, which represents power supply and a value of 0, which represents standby or non-power supply.

5. A method for steady-state adjustment of power supply for railway hubs according to claim 4, characterized in that, The specific steps of step S4 are as follows: Set monitoring interval initial value At present ; S41, if the current time The power supply for step S3 Position status of the power supply circuit breaker All values ​​are 0, and at the previous moment, there was only one power supply. Position status of the power supply circuit breaker If the value is 1, proceed to step S42; otherwise, wait for the specified time. Continue to step S41; S42 sets the rated parameters of the power supply. Remove power supply Then, a new set is formed. ; Collection of real-time and historical information on power supply Remove power supply Then, a new set is formed. ; S43, Calculate the new set Power supply in Available power time Remove 2* Power supply, collection Change to a set ,gather Change to a set Let the number of current power supplies be... , ; S44, Calculation Time Collection Selection factors : S45, find the largest selectivity factor Select the corresponding power supply Provide power if If yes, then end; otherwise, wait. , turn the power supply Join, collection Change to a set and set Proceed to steps S43-S45 to recalculate the power supply selection factor.

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