Line voltage deviation optimization method and system of heat pump electricity storage interconnection system

Abstract

The invention discloses a line voltage deviation optimization method and system for a heat pump power storage interconnection system, and belongs to the technical field of energy storage, and the method comprises the steps: obtaining a line voltage deviation value of a photovoltaic reverse transmission line and a heavy load line; and according to the line voltage deviation value of the photovoltaic reverse transmission line and the heavy load line and the line voltage deviation constraint range, calculating a power optimization value of a charging port and a power optimization value of a discharging port of the heat pump power storage equipment, and scheduling operation power of the charging port and the discharging port of the heat pump power storage equipment. Controlling the line voltage deviation within a line voltage deviation constraint range; wherein the charging end of the heat pump power storage equipment is connected with the access point, with the highest voltage deviation sensitivity, on the photovoltaic reverse transmission line, and the discharging end of the heat pump power storage equipment is connected with the access point, with the highest voltage deviation sensitivity, on the heavy load line. According to the invention, the problem of voltage deviation possibly caused when the large-scale distributed new energy is accessed to the existing power distribution network is solved.

Description

Technical Field

[0001] The present invention relates to a method and system for optimizing the line voltage deviation of a heat pump energy storage interconnection system, belonging to the technical field of energy storage. Background Art

[0002] With the rapid progress of distributed new energy technologies such as photovoltaic and wind power, the distribution line, as a key link connecting new energy and the power grid, has become increasingly important. These new energies not only provide an additional power source for the power grid but also pose new challenges to the operation and management of the power grid. As the primary way to accommodate new energy, the distribution line not only needs to ensure the power supply demand of traditional loads but also effectively consume the electric energy generated by new energy, thus becoming an important configuration platform integrating power supply and new energy consumption. In this context, the intelligent management and optimal dispatching of distribution lines have become research hotspots. Through advanced monitoring technologies and control strategies, it is possible to achieve real-time tracking and prediction of new energy power generation and precise regulation of the load on the distribution line, thereby ensuring the stable operation of the power grid and the efficient utilization of new energy.

[0003] Although significant progress has been made in the acceptance and consumption of new energy by distribution lines, a series of technical problems still exist. Due to the imbalance between new energy development resources and load supply planning, different distribution lines often face different voltage deviation problems. In heavy-load lines, since the power flow is from the substation to the end of the distribution line, it is easy to cause a low-voltage phenomenon at the end of the line, affecting the power supply quality; while in lines with a high proportion of new energy access, the power flow may reverse, that is, from the end of the distribution line to the substation, resulting in a high-voltage problem at the end of the line. This imbalance in power flow not only exacerbates the voltage deviation problem but also may lead to the instability of the power grid operation. Although energy storage technologies, especially heat pump energy storage technologies, are regarded as effective means to solve the problems of new energy fluctuations and voltage deviations due to their advantages such as low cost, high safety, and long energy storage time, how to effectively apply them to the distribution network system, especially how to optimize and control the voltage deviation problems caused by new energy fluctuations in multiple lines, is still in the technical blank stage. Therefore, how to make full use of the multi-port access advantages of the heat pump energy storage system and combine the line voltage deviation constraints to optimize its charge and discharge strategies has become an urgent technical problem to be solved. Summary of the Invention

[0004] The purpose of the present invention is to provide a method and system for optimizing the line voltage deviation of a heat pump energy storage interconnection system. By interconnecting the heat pump energy storage devices with heavy and light load lines, the optimized values of the charging port power and the discharging port power of the heat pump energy storage devices are calculated, and the line voltage deviation is controlled within the range of line voltage deviation constraints, so as to solve the voltage deviation problems that may be caused when the existing distribution network accesses large-scale distributed new energy.

[0005] To solve the above technical problems, the present invention is implemented by the following technical solutions:

[0006] In a first aspect, the present invention provides a method for optimizing the line voltage deviation of a heat pump energy storage interconnection system, including:

[0007] Obtain the line voltage deviation values of the photovoltaic reverse power transmission line and the heavy load line;

[0008] According to the line voltage deviation values of the photovoltaic reverse power transmission line and the heavy load line and the line voltage deviation constraint range, calculate the optimized charging port power value and the optimized discharging port power value of the heat pump energy storage device;

[0009] According to the optimized charging port power value and the optimized discharging port power value of the heat pump energy storage device, schedule the operating power of the charging port and the discharging port of the heat pump energy storage device to control the line voltage deviation within the line voltage deviation constraint range;

[0010] Among them, the charging end of the heat pump energy storage device is connected to the access point with the highest voltage deviation sensitivity on the photovoltaic reverse power transmission line, and the discharging end of the heat pump energy storage device is connected to the access point with the highest voltage deviation sensitivity on the heavy load line.

[0011] Further, the method for determining the access point with the highest voltage deviation sensitivity includes:

[0012] Construct the line topology structures of the photovoltaic reverse power transmission line and the heavy load line, and calculate the voltage deviation sensitivities between all adjacent nodes;

[0013] Randomly select a point on the path between the adjacent nodes with the highest voltage deviation sensitivity as the access point.

[0014] Further, the calculation formula of the voltage deviation sensitivity is expressed as:

[0015] ;

[0016] In the formula, represents the voltage deviation sensitivity between adjacent nodes and , represents the resistance value of the path between adjacent nodes and , represents the rated voltage, represents the total number of nodes.

[0017] Further, the method for obtaining the line voltage deviation values of the photovoltaic reverse power transmission line and the heavy load line includes:

[0018] Through the voltage deviation monitoring module, calculate the line voltage deviation values of the photovoltaic reverse power transmission line and the heavy load line according to the line voltage deviation calculation formula;

[0019] The line voltage deviation calculation formula is expressed as:

[0020] ;

[0021] In the formula, represents the line voltage deviation value, represents the rated line voltage, represents the actual line voltage.

[0022] Furthermore, the line voltage deviation constraints include the maximum allowable voltage upper deviation margin, the maximum allowable voltage lower deviation margin, the heat pump energy storage discharge capacity, the heat pump energy storage charging capacity, the real-time voltage deviation margin, and the maximum allowable voltage lower deviation margin.

[0023] Furthermore, the calculation formula of the maximum allowable voltage upper deviation margin is expressed as:

[0024] ;

[0025] In the formula, represents the maximum allowable voltage upper deviation margin value of node , represents the upper limit of the operating voltage deviation of node , represents the voltage value of node after the maximum distributed photovoltaic access to the line;

[0026] The calculation formula of the maximum allowable voltage lower deviation margin is expressed as:

[0027] ;

[0028] In the formula, represents the maximum allowable voltage lower deviation margin of node , represents the lower limit of the operating voltage deviation of node , represents the voltage value of node after the maximum load access.

[0029] The calculation formula of the heat pump energy storage discharge capacity is expressed as:

[0030] ;

[0031] In the formula, represents the heat pump energy storage discharge capacity of node , represents the maximum value function, Indicates the voltage deviation sensitivity between the 1st node and the node, Indicates the voltage deviation sensitivity between the node and the Indicates the maximum allowable voltage downward deviation margin of the Indicates the voltage deviation sensitivity between the 1st node and the node, Indicates the voltage deviation sensitivity of the

[0032] The calculation formula for the charging capacity of the heat pump energy storage is expressed as:

[0033] ;

[0034] In the formula, Indicates the charging capacity of the heat pump energy storage at node Indicates the maximum allowable voltage upward deviation margin value of the

[0035] The calculation formula for the real-time voltage deviation margin is expressed as:

[0036] ;

[0037] In the formula, Indicates the real-time voltage deviation margin at node Indicates the real-time voltage value at node

[0038] The calculation formula for the maximum allowable voltage downward deviation margin is expressed as:

[0039] ;

[0040] In the formula, Indicates the maximum allowable voltage downward deviation margin at node

[0041] Furthermore, the optimized value of the charging port power of the heat pump energy storage device is expressed as:

[0042] ;

[0043] In the formula, Indicates the optimized value of the charging port power of the heat pump energy storage device, Indicates the maximum value function, Indicates the real-time voltage deviation margin of the 1st node, Indicates the maximum allowable voltage deviation margin of the first node, Indicates the node The real-time voltage deviation margin of, Indicates the node The maximum allowable voltage deviation margin value of, Indicates the node And the voltage deviation sensitivity between the node and the first node, Indicates the node And and the Voltage deviation sensitivity of the node, Indicates the node The heat pump electricity storage charging capacity of.

[0044] Furthermore, the optimized value of the discharge port power of the heat pump electricity storage device is expressed as:

[0045] ;

[0046] In the formula, Indicates the optimized value of the discharge port power of the heat pump electricity storage device, Indicates the maximum value function, Indicates the maximum allowable voltage deviation margin of the first node, Indicates the node The maximum allowable voltage deviation margin of, Indicates the maximum allowable voltage deviation margin of the first node, Indicates the node The maximum allowable voltage deviation margin of, Indicates the node And the voltage deviation sensitivity between the node and the first node, Indicates the node And and the Voltage deviation sensitivity of the node, Indicates the node The heat pump electricity storage charging capacity of, Indicates the node The heat pump electricity storage discharge capacity of.

[0047] In a second aspect, the present invention provides a line voltage deviation optimization system for a heat pump electricity storage interconnection system, including:

[0048] A heat pump electricity storage device, whose charging end is connected to the access point with the highest voltage deviation sensitivity on the photovoltaic reverse power transmission line, and whose discharging end is connected to the access point with the highest voltage deviation sensitivity on the heavy load line;

[0049] The voltage deviation monitoring module includes a collection sensor and a data processing unit. The collection sensor is used to collect the voltage and power of the photovoltaic reverse power transmission line and the heavy load line in real time. The data processing unit is used to calculate the line voltage deviation of the photovoltaic reverse power transmission line and the heavy load line according to the voltage and power of the photovoltaic reverse power transmission line and the heavy load line, and transmit it to the interconnected system control unit;

[0050] The interconnected system control unit is used to be connected to the heat pump energy storage device and the voltage deviation monitoring module respectively. It is used to calculate the optimized charging port power value and the optimized discharging port power value of the heat pump energy storage device according to the line voltage deviation value and the line voltage deviation constraint range of the photovoltaic reverse power transmission line and the heavy load line, and schedule the operating power of the charging port and the discharging port of the heat pump energy storage device according to the optimized charging port power value and the optimized discharging port power value of the heat pump energy storage device, so as to control the line voltage deviation within the line voltage deviation constraint range.

[0051] Furthermore, the heat pump energy storage device includes a high-temperature heat pump cycle device, a heat storage device and an organic Rankine cycle device;

[0052] The high-temperature heat pump cycle device is used to convert the input electric energy and low-grade heat energy into high-grade heat energy and store it in the heat storage device;

[0053] The heat storage device is respectively connected to the high-temperature heat pump cycle device and the organic Rankine cycle device, and is used to store high-grade heat energy;

[0054] The organic Rankine cycle device is used to convert the high-grade heat energy stored in the heat storage device into electric energy for output.

[0055] Compared with the prior art, the beneficial effects achieved by the present invention:

[0056] 1. The present invention connects the heat pump energy storage device to the access point with the highest voltage deviation sensitivity in the photovoltaic reverse power transmission line and the heavy load line, and simultaneously obtains the line voltage deviation values of the photovoltaic reverse power transmission line and the heavy load line. According to the line voltage deviation values of the photovoltaic reverse power transmission line and the heavy load line and the line voltage deviation constraint range, the optimized charging port power value and the optimized discharging port power value of the heat pump energy storage device are calculated; according to the optimized charging port power value and the optimized discharging port power value of the heat pump energy storage device, the operating power of the charging port and the discharging port of the heat pump energy storage device is scheduled, and the line voltage deviation is controlled within the line voltage deviation constraint range. This not only significantly enhances the stability of the power grid, effectively prevents equipment failures or power supply quality degradation problems that may be caused by excessive voltage deviation, but also solves the voltage deviation problems that may be caused when the existing distribution network accesses large-scale distributed new energy. At the same time, relying on the electric energy and heat energy conversion function of the heat pump energy storage device, it realizes the efficient conversion and storage of energy, and provides technical support for the wide application of the heat pump energy storage technology.

[0057] 2. The present invention realizes the efficient conversion and storage between electric energy and heat energy through a high-temperature heat pump cycle device, a heat storage device, and an organic Rankine cycle device. It not only improves the energy utilization efficiency but also enables the system to flexibly adjust the output of electric energy and heat energy according to the grid demand, enhancing the overall flexibility of the power system. Especially when the grid voltage fluctuates, the heat pump energy storage device can quickly respond and balance the grid load through charge and discharge operations, effectively maintaining the grid stability.

[0058] 3. By setting the real-time voltage deviation margin and the preset voltage deviation constraint conditions through the line voltage deviation constraint range, the present invention can dynamically adjust the charge and discharge power of the heat pump energy storage device to achieve the maximum utilization of energy. It not only improves the energy utilization efficiency but also reduces the operating cost of the system, bringing significant economic and social benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0059] Figure 1 is a schematic flowchart of a method for optimizing the line voltage deviation of a heat pump energy storage interconnection system provided by an embodiment of the present invention;

[0060] Figure 2 is a schematic structural diagram of a heat pump energy storage device provided by an embodiment of the present invention;

[0061] Figure 3 is a schematic structural diagram of a system for optimizing the line voltage deviation of a heat pump energy storage interconnection system provided by an embodiment of the present invention;

[0062] Figure 4 is a schematic diagram of the working principle of a heat pump energy storage device provided by an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0063] The technical solution of the present invention will be described in detail below through the drawings and specific embodiments. It should be understood that the specific features in the embodiments of the present invention are detailed descriptions of the technical solution of the present invention, rather than limitations on the technical solution of the present invention. Without conflict, the technical features in the embodiments of the present invention and the embodiments can be combined with each other.

[0064] The term "and / or" only describes the associated relationship of associated objects and indicates that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " generally represents an "or" relationship between the associated objects before and after.

[0065] Embodiment 1

[0066] As Figure 1 shown, this embodiment introduces a method for optimizing the line voltage deviation of a heat pump energy storage interconnection system, including:

[0067] Step 1: Use the voltage deviation monitoring module to calculate the line voltage deviation sensitivity according to historical load and PV access conditions.

[0068] In some embodiments, the charging end of the heat pump energy storage device is connected to the access point with the highest voltage deviation sensitivity on the PV reverse power transmission line, and the discharging end of the heat pump energy storage device is connected to the access point with the highest voltage deviation sensitivity on the heavy load line.

[0069] Among them, to determine the access point with the highest voltage deviation sensitivity using the voltage deviation monitoring module, the method includes: constructing the line topology of the PV reverse power transmission line and the heavy load line, calculating the voltage deviation sensitivity between all adjacent nodes; randomly selecting a point on the path between the adjacent nodes with the highest voltage deviation sensitivity as the access point.

[0070] In this embodiment, the calculation formula of the voltage deviation sensitivity is expressed as:

[0071] ;

[0072] In the formula, represents the voltage deviation sensitivity between adjacent nodes and , represents the resistance value of the path between adjacent nodes and , represents the rated voltage, represents the total number of nodes.

[0073] Step 2: Connect the charging end of the heat pump energy storage device to the access point with the highest voltage deviation sensitivity on the PV reverse power transmission line, and connect the discharging end of the heat pump energy storage device to the access point with the highest voltage deviation sensitivity on the heavy load line.

[0074] In this embodiment, when the PV reverse power causes the line voltage to rise, the heat pump energy storage device acts as a dynamic load to quickly absorb the excess electric energy, directly reducing the voltage deviation of the high-sensitivity nodes and avoiding the overvoltage risk; when the heavy load causes the line voltage to drop, the heat pump energy storage device acts as a distributed power source to inject electric energy into the high-sensitivity nodes, quickly raising the voltage and alleviating the undervoltage problem.

[0075] Step 3: Connect the interconnected system control unit to the heat pump energy storage device and the voltage deviation monitoring module respectively to construct a heat pump energy storage interconnected system based on line voltage deviation constraints, so as to obtain the line voltage deviation values of the PV reverse power transmission line and the heavy load line.

[0076] In this embodiment, the method for obtaining the line voltage deviation values of the PV reverse power transmission line and the heavy load line includes:

[0077] Through the voltage deviation monitoring module, calculate the line voltage deviation values of the PV reverse power transmission line and the heavy load line according to the line voltage deviation calculation formula; the line voltage deviation calculation formula is expressed as:

[0078] ;

[0079] In the formula, represents the line voltage deviation value, represents the rated line voltage, represents the actual line voltage.

[0080] Step 4: Use the voltage monitoring module to calculate the optimized charging port power value and the optimized discharging port power value of the heat pump energy storage device according to the line voltage deviation values of the PV reverse power transmission line and the heavy load line and the line voltage deviation constraint range.

[0081] In some embodiments, the line voltage deviation constraints include the maximum allowable voltage upper deviation margin, the maximum allowable voltage lower deviation margin, the heat pump energy storage discharging capacity, the heat pump energy storage charging capacity, the real-time voltage deviation margin, and the maximum allowable voltage lower deviation margin.

[0082] In this embodiment, the calculation formula of the maximum allowable voltage upper deviation margin is expressed as:

[0083] ;

[0084] In the formula, represents the maximum allowable voltage upper deviation margin value of node , represents the upper limit of the operating voltage deviation of node , represents the voltage value of node after the maximum distributed PV is connected to the line;

[0085] In this embodiment, the calculation formula of the maximum allowable voltage lower deviation margin is expressed as:

[0086] ;

[0087] In the formula, represents the maximum allowable voltage lower deviation margin of node , represents the lower limit of the operating voltage deviation of node , represents the voltage value of node after the maximum load is connected.

[0088] In this embodiment, the calculation formula of the heat pump energy storage discharging capacity is expressed as:

[0089] ;

[0090] Wherein, represents the heat pump energy storage discharge capacity of node ; represents the maximum value function, represents the voltage deviation sensitivity between the first node and node ; represents the th node and node voltage deviation sensitivity; represents the th node's maximum allowable voltage lower deviation margin, represents the voltage deviation sensitivity between the first node and the th node, represents the th node's voltage deviation sensitivity.

[0091] In this embodiment, the calculation formula of the heat pump energy storage charging capacity is expressed as:

[0092] ;

[0093] Wherein, represents the heat pump energy storage charging capacity of node ; represents the maximum allowable voltage upper deviation margin value of the th node;

[0094] In this embodiment, the calculation formula of the real-time voltage deviation margin is expressed as:

[0095] ;

[0096] Wherein, represents the real-time voltage deviation margin of node ; represents the real-time voltage value of node ;

[0097] The calculation formula of the maximum allowable voltage lower deviation margin is expressed as:

[0098] ;

[0099] Wherein, represents the maximum allowable voltage lower deviation margin of node ;

[0100] In this embodiment, the optimized value of the charging port power of the heat pump energy storage device is expressed as:

[0101] ;

[0102] In the formula, represents the optimized value of the charging port power of the heat pump energy storage device, represents the maximum value function, represents the real-time voltage deviation margin of the first node, represents the maximum allowable voltage deviation margin of the first node, represents the node 's real-time voltage deviation margin, represents the node 's maximum allowable voltage upper deviation margin value, represents the node and the voltage deviation sensitivity between the first node, represents the node and the th node's voltage deviation sensitivity, represents the node 's heat pump energy storage charging capacity.

[0103] In this embodiment, the optimized value of the discharge port power of the heat pump energy storage device is expressed as:

[0104] ;

[0105] In the formula, represents the optimized value of the discharge port power of the heat pump energy storage device, represents the maximum value function, represents the maximum allowable voltage deviation margin of the first node, represents the node 's maximum allowable voltage deviation margin, represents the maximum allowable voltage deviation margin of the first node, represents the node 's maximum allowable voltage deviation margin, represents the node and the voltage deviation sensitivity between the first node, represents the node and the th node's voltage deviation sensitivity, represents the node 's heat pump energy storage charging capacity, represents the node 's heat pump energy storage discharge capacity.

[0106] Step 5: Using the interconnected system control unit, according to the optimized values of the charging port power and the discharging port power of the heat pump energy storage device, schedule the operating powers of the charging port and the discharging port of the heat pump energy storage device, and control the line voltage deviation within the range of the line voltage deviation constraint.

[0107] Embodiment 2

[0108] As Figure 3 shown, based on the same inventive concept as Embodiment 1, this embodiment introduces a line voltage deviation optimization system for a heat pump energy storage interconnected system, including a heat pump energy storage device, a voltage deviation monitoring module, and an interconnected system control unit.

[0109] The charging end of the heat pump energy storage device is connected to the access point with the highest voltage deviation sensitivity on the photovoltaic reverse power transmission line, and its discharging end is connected to the access point with the highest voltage deviation sensitivity on the heavy load line.

[0110] Among them, as Figure 2 shown, the heat pump energy storage device includes a high-temperature heat pump cycle device, a heat storage device, and an organic Rankine cycle device; the high-temperature heat pump cycle device is used to convert input electric energy and low-grade heat energy into high-grade heat energy and store it in the heat storage device; the heat storage device is respectively connected to the high-temperature heat pump cycle device and the organic Rankine cycle device, and is used for storing high-grade heat energy; the organic Rankine cycle device is used to convert the stored high-grade heat energy in the heat storage device into electric energy for output.

[0111] The heat pump energy storage device of the present invention has the function of bidirectional conversion and storage of electric energy and heat energy, and its working logic is deeply coupled with the operating characteristics of the power grid. As Figure 4 shown, it is specifically manifested as:

[0112] Under the charging condition, the heat pump energy storage device converts surplus electric energy into heat energy for storage through the electric energy - heat energy conversion module. The charging end of the heat pump energy storage device is connected to the access point with the highest voltage deviation sensitivity in the photovoltaic reverse power transmission line. When there is excessive photovoltaic power generation or the power grid needs to absorb redundant power, by using the characteristic that the access point with the highest voltage deviation sensitivity is prone to voltage deviation, efficient heat storage of electric energy is realized.

[0113] Under the discharging condition, the heat pump energy storage device releases the stored heat energy and generates electricity synchronously through the heat energy - electric energy conversion module. The discharging end of the heat pump energy storage device is accurately connected to the access point with the highest voltage deviation sensitivity in the heavy load line. When the power grid encounters a peak electricity consumption or a significant voltage drop, the access point with the highest voltage deviation sensitivity has the most urgent need for power support. At this time, the heat pump energy storage device can provide electric energy compensation in a timely manner.

[0114] The intelligent access strategy based on voltage sensitivity distribution proposed by the present invention enables the heat pump energy storage device to have the dual functions of energy buffering and power grid peak shaving. It not only solves the intermittency problem of new energy power generation but also enhances the self-regulation ability of the power grid during load fluctuations, forming a collaborative optimization mechanism of "source-storage-load".

[0115] The voltage deviation monitoring module includes a collection sensor and a data processing unit. The collection sensor is used to collect the voltage and power of the photovoltaic reverse power transmission line and the heavy load line in real time. The data processing unit is used to calculate the line voltage deviation of the photovoltaic reverse power transmission line and the heavy load line according to the voltage and power of the photovoltaic reverse power transmission line and the heavy load line and transmit it to the interconnected system control unit.

[0116] The voltage deviation monitoring module of the present invention adopts a dual-loop sensing architecture to synchronously collect the real-time voltage data of the photovoltaic reverse power transmission line and the heavy load line, dynamically calculate the voltage deviation values of the two key lines through the built-in algorithm, and establish a time-voltage deviation curve, enabling the interconnected system control unit to accurately judge the power grid state and make adjustment decisions in a timely manner.

[0117] The interconnected system control unit is used to be connected to the heat pump energy storage device and the voltage deviation monitoring module respectively. It is used to calculate the optimized charging port power value and the optimized discharging port power value of the heat pump energy storage device according to the line voltage deviation values and the line voltage deviation constraint ranges of the photovoltaic reverse power transmission line and the heavy load line, and schedule the operating power of the charging port and the discharging port of the heat pump energy storage device according to the optimized charging port power value and the optimized discharging port power value of the heat pump energy storage device, so as to control the line voltage deviation within the line voltage deviation constraint range.

[0118] The interconnected system control unit of the present invention is connected to the heat pump energy storage device and the voltage deviation monitoring module to form a closed-loop control system. According to the two grid line voltage deviations provided by the voltage deviation monitoring module and the preset line voltage deviation constraint range, it calculates the optimized power values of the charging port and the discharging port of the heat pump energy storage device, and controls the line voltage deviation within the line voltage deviation constraint range by adjusting the charging and discharging power of the heat pump energy storage device, thereby maintaining the stability and security of the power grid.

[0119] This embodiment utilizes the electric energy-thermal energy conversion ability of the heat pump energy storage device, combines the real-time data of the voltage deviation monitoring module, and realizes the automatic adjustment of the power grid voltage through the accurate calculation of the interconnected system control unit. When the voltage of the photovoltaic reverse power transmission line is too high, the system absorbs the excess power by increasing the charging power of the heat pump energy storage device to reduce the voltage deviation; when the voltage of the heavy load line is too low, the system provides additional power by increasing the discharging power of the heat pump energy storage device to increase the voltage level.

[0120] The present invention also effectively controls the voltage deviation of the power grid line by adjusting the charging and discharging power of the heat pump energy storage device in real time, avoiding damage to power grid equipment and users caused by voltage fluctuations. When the photovoltaic power generation is excessive, the system can timely absorb the excess power, improving the utilization rate of new energy and the flexibility of the power grid. The present invention realizes the optimal allocation of electric energy and heat energy by intelligently scheduling the charging and discharging of the heat pump energy storage device, improving the overall efficiency and economic benefits of the energy system.

[0121] In summary of the above embodiments, the present invention connects the heat pump energy storage device to the access point with the highest voltage deviation sensitivity in the photovoltaic reverse power transmission line and the heavy load line, and simultaneously obtains the line voltage deviation values of the photovoltaic reverse power transmission line and the heavy load line. According to the line voltage deviation values of the photovoltaic reverse power transmission line and the heavy load line and the line voltage deviation constraint range, the optimized values of the charging port power and the discharging port power of the heat pump energy storage device are calculated; according to the optimized values of the charging port power and the discharging port power of the heat pump energy storage device, the operating powers of the charging port and the discharging port of the heat pump energy storage device are scheduled to control the line voltage deviation within the line voltage deviation constraint range, not only significantly enhancing the stability of the power grid and effectively preventing equipment failures or power supply quality degradation problems that may be caused by excessive voltage deviation, but also solving the voltage deviation problems that may be caused when the existing distribution network accesses large-scale distributed new energy. At the same time, relying on the function of converting electric energy and heat energy possessed by the heat pump energy storage device, the efficient conversion and storage of energy are realized, providing technical support for the wide application of heat pump energy storage technology.

[0122] The present invention realizes the efficient conversion and storage between electric energy and heat energy through a high-temperature heat pump cycle device, a heat storage device and an organic Rankine cycle device, not only improving the energy utilization efficiency, but also enabling the system to flexibly adjust the output of electric energy and heat energy according to the power grid demand, enhancing the overall flexibility of the power system. Especially when the power grid voltage fluctuates, the heat pump energy storage device can quickly respond, balancing the power grid load through charging and discharging operations and effectively maintaining the stability of the power grid.

[0123] The present invention sets a real-time voltage deviation margin and a preset voltage deviation constraint condition through the line voltage deviation constraint range, and can dynamically adjust the charging and discharging power of the heat pump energy storage device to realize the maximum utilization of energy, not only improving the energy utilization efficiency, but also reducing the operating cost of the system, bringing significant economic and social benefits.

[0124] Those skilled in the art will understand that the embodiments of the present invention can be provided as a method, a system, or a computer program product. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present invention can take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk memory, CD-ROM, optical memory, etc.) that contain computer-usable program code.

[0125] The present invention is described with reference to the flowcharts and / or block diagrams of methods, apparatuses (systems), and computer program products according to embodiments of the present invention. It should be understood that each flow and / or block in the flowcharts and / or block diagrams, and the combination of flows and / or blocks in the flowcharts and / or block diagrams, can be realized by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing devices to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing devices generate means for implementing the functions specified in Figure 1 one flow or multiple flows and / or blocks Figure 1 one block or multiple blocks.

[0126] These computer program instructions can also be stored in a computer-readable memory that can direct a computer or other programmable data processing devices to work in a specific manner, so that the instructions stored in the computer-readable memory generate a manufactured article including instruction means, and the instruction means implement the functions specified in Figure 1 one flow or multiple flows and / or blocks Figure 1 one block or multiple blocks.

[0127] These computer program instructions can also be loaded onto a computer or other programmable data processing devices, so that a series of operation steps are executed on the computer or other programmable devices to generate a computer-implemented process. Thus, the instructions executed on the computer or other programmable devices provide steps for implementing the functions specified in Figure 1 one flow or multiple flows and / or blocks Figure 1 one block or multiple blocks.

[0128] The embodiments of the present invention have been described above in conjunction with the accompanying drawings. However, the present invention is not limited to the above specific embodiments. The above specific embodiments are merely illustrative and not restrictive. Under the inspiration of the present invention, those of ordinary skill in the art can also make many forms without departing from the spirit and scope of the present invention as protected by the claims. These all fall within the protection scope of the present invention.

Claims

1. A method for optimizing the line voltage deviation of a heat pump energy storage interconnection system, characterized in that, Including: Obtaining the line voltage deviation values of the photovoltaic reverse power transmission line and the heavy load line; Calculating the optimized charging port power value and the optimized discharging port power value of the heat pump energy storage device according to the line voltage deviation values of the photovoltaic reverse power transmission line and the heavy load line and the line voltage deviation constraint range; Scheduling the operating power of the charging port and the discharging port of the heat pump energy storage device according to the optimized charging port power value and the optimized discharging port power value of the heat pump energy storage device, and controlling the line voltage deviation within the line voltage deviation constraint range; Wherein, the charging end of the heat pump energy storage device is connected to the access point with the highest voltage deviation sensitivity on the photovoltaic reverse power transmission line, and the discharging end of the heat pump energy storage device is connected to the access point with the highest voltage deviation sensitivity on the heavy load line.

2. The method for optimizing the line voltage deviation of the heat pump energy storage and interconnection system according to claim 1, wherein, The calculation formula of the voltage deviation sensitivity is expressed as: ； wherein, represents the voltage deviation sensitivity between adjacent nodes and ; represents the resistance value of the path between adjacent nodes and ; represents the rated voltage represents the total number of nodes.

3. The line voltage deviation optimization method of the heat pump energy storage and interconnection system according to claim 1, characterized in that, The method for obtaining the line voltage deviation values of the photovoltaic reverse power transmission line and the heavy load line includes: The voltage deviation monitoring module calculates the line voltage deviation values of the photovoltaic reverse power transmission line and the heavy load line according to the line voltage deviation calculation formula; The line voltage deviation calculation formula is expressed as: ； Wherein, represents the line voltage deviation value, represents the rated line voltage, represents the actual line voltage.

4. The method for optimizing the line voltage deviation of the heat pump energy storage and interconnection system according to claim 1, characterized in that The line voltage deviation constraints include the maximum allowable upper voltage deviation margin, the maximum allowable lower voltage deviation margin, the heat pump energy storage discharging capacity, the heat pump energy storage charging capacity, the real-time voltage deviation margin, and the maximum allowable lower voltage deviation margin.

5. The method for optimizing the line voltage deviation of the heat pump energy storage and interconnection system according to claim 4, characterized in that The calculation formula of the maximum allowable upper voltage deviation margin is expressed as: ； In the formula, represents the maximum allowable voltage deviation margin value of the node , represents the upper limit of the operating voltage deviation of the node , represents the voltage value of the node after the maximum distributed PV is connected to the line; The calculation formula of the maximum allowable lower voltage deviation margin is expressed as: ； In the formula, represents the maximum allowable voltage deviation margin of the node , represents the lower limit of the operating voltage deviation of the node , represents the voltage value of the node after the maximum load is connected.

6. The method for optimizing the line voltage deviation of the heat pump and electricity storage interconnection system according to claim 5, wherein The calculation formula of the heat pump energy storage discharging capacity is expressed as: ； Wherein, represents the heat pump electricity storage discharge capacity of node ; represents the maximum value function represents the voltage deviation sensitivity between the first node and node ; represents the th node and node voltage deviation sensitivity; represents the maximum allowable voltage deviation margin of the th node; represents the voltage deviation sensitivity between the first node and the th node; represents the voltage deviation sensitivity of the th node. The calculation formula of the heat pump energy storage charging capacity is expressed as: ； In the formula, represents the heat pump energy storage charging capacity of the node , represents the maximum allowable voltage upper deviation margin value of the th node; The calculation formula of the real-time voltage deviation margin is expressed as: ； In the formula, represents the real-time voltage deviation margin of the node , and represents the real-time voltage value of the node . The calculation formula of the maximum allowable lower voltage deviation margin is expressed as: ； In the formula, represents the maximum allowable voltage deviation margin of the node .

7. The method for optimizing the line voltage deviation of the heat pump energy storage and interconnection system according to claim 1, wherein The optimized charging port power value of the heat pump energy storage device is expressed as: ； Wherein, represents the optimized value of the charging port power of the heat pump energy storage device, represents the maximum value function, represents the real-time voltage deviation margin of the first node, represents the maximum allowable voltage deviation margin of the first node, represents the node 's real-time voltage deviation margin, represents the node 's maximum allowable voltage positive deviation margin value, represents the node and the voltage deviation sensitivity between the first node, represents the node and the voltage deviation sensitivity between the node and the other node, represents the node 's heat pump energy storage charging capacity.

8. The method for optimizing the line voltage deviation of the heat pump energy storage and interconnection system according to claim 1, characterized in that, The optimized discharging port power value of the heat pump energy storage device is expressed as: ； In the formula, represents the optimized value of the power at the discharge port of the heat pump energy storage device, represents the maximum value function, represents the maximum allowable voltage deviation margin at the first node, represents the node 's maximum allowable voltage deviation margin, represents the maximum allowable voltage deviation margin at the first node, represents the node 's maximum allowable voltage deviation margin, represents the node and the voltage deviation sensitivity between the first node, represents the node and and the th node's voltage deviation sensitivity, represents the heat pump energy storage charging capacity of the node , represents the heat pump energy storage discharge capacity of the node .

9. A line voltage deviation optimization system for a heat pump energy storage and interconnection system, characterized in that, Including: A heat pump energy storage device, whose charging end is connected to the access point with the highest voltage deviation sensitivity on the photovoltaic reverse power transmission line, and whose discharging end is connected to the access point with the highest voltage deviation sensitivity on the heavy load line; A voltage deviation monitoring module, including a collection sensor and a data processing unit, where the collection sensor is used to collect the voltage and power of the photovoltaic reverse power transmission line and the heavy load line in real time, and the data processing unit is used to calculate the line voltage deviation of the photovoltaic reverse power transmission line and the heavy load line according to the voltage and power of the photovoltaic reverse power transmission line and the heavy load line and transmit it to the interconnected system control unit; An interconnected system control unit, connected to the heat pump energy storage device and the voltage deviation monitoring module respectively, is used to calculate the optimized charging port power value and the optimized discharging port power value of the heat pump energy storage device according to the line voltage deviation values of the photovoltaic reverse power transmission line and the heavy load line and the line voltage deviation constraint range, and schedule the operating power of the charging port and the discharging port of the heat pump energy storage device according to the optimized charging port power value and the optimized discharging port power value of the heat pump energy storage device, and control the line voltage deviation within the line voltage deviation constraint range.

10. The line voltage deviation optimization system of the heat pump energy storage and interconnection system according to claim 9, characterized in that, The heat pump energy storage device includes a high-temperature heat pump cycle device, a heat storage device, and an organic Rankine cycle device; The high-temperature heat pump cycle device is used to convert input electric energy and low-grade heat energy into high-grade heat energy and store it in the heat storage device; The heat storage device is respectively connected to the high-temperature heat pump cycle device and the organic Rankine cycle device, and is used for storing high-grade heat energy; The organic Rankine cycle device is used to convert the stored high-grade heat energy in the heat storage device into electric energy for output.

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